AUTOTRANSFORMER (400 kV/164kV, 400 - 450 MVA) TYPE ...

TEİAŞ-MYD/2015-035.0

AUTOTRANSFORMER (400 kV/164kV, 400 - 450 MVA) TYPE TECHNICAL SPECIFICATION

The original version of this technical specification has been prepared in Turkish and in case of any inconsistency between English and Turkish, the Turkish language shall prevail.

JULY 2015/OP-35

TEİAŞ

TEİAŞ-MYD/2015-035.0 0 Type Technical Specification for

Autotransformer (400 kV164kV, 400 - 450 MVA)

AUTOTRANSFORMER (400 kV/164kV,400-450 MVA) TYPE TECHNICAL SPECIFICATION

1. GENERAL .............................................................................................................. 2

1.1. Subject and the scope ....................................................................................... 2 1.2. Standards and documents ................................................................................ 2 1.3. Operating Conditions ........................................................................................ 7 1.4. Auxiliary Power Supplies ................................................................................... 8

2. TECHNICAL SPECIFICATIONS ............................................................................ 8

2.1. Nominal values and the performance ................................................................ 8

2.2. No Load Energisation ...................................................................................... 11

2.3. Overloading ..................................................................................................... 11 2.4. Tolerances ...................................................................................................... 11 2.5. Failure to meet guaranteed values (at the phase of acceptance tests) .......... 12 2.6. Evaluation of Losses (at the phase of bid evaluation) ..................................... 12

2.7. Deviations ....................................................................................................... 12 2.8. Structural Characteristics ................................................................................ 13

2.8.1. Magnetic Circuit (Core) ............................................................................ 13 2.8.2. Windings .................................................................................................. 14 2.8.3. Tank ........................................................................................................ 15

2.8.4. Oil Conservator........................................................................................ 17 2.8.5. Bushings and Terminals .......................................................................... 18

2.8.6. ON Load Tap Changer ............................................................................ 19 2.8.7. Cooling System ....................................................................................... 22

2.8.8. Auxiliary Equipment (Accessories) .......................................................... 23 2.8.9. Control Cabinet and Wiring Harness ....................................................... 25 2.8.10. Insulating Oil .......................................................................................... 26

2.8.11. Top View and Dimensions ..................................................................... 26 2.8.12. Transportation ....................................................................................... 26

2.8.13. Painting ................................................................................................. 27 2.8.14. Name plates and Plates ........................................................................ 28

3. TESTS .................................................................................................................. 29 3.1. General ........................................................................................................... 29

3.2. Tests On Components At factory .................................................................... 29

3.3. Tests on the non-tanked transformer during manufacturing – Test with low voltage Repetitive impulses ................................................................................... 30 3.4. Tests on fully assembled autotransformer at factory ....................................... 31

3.4.1. Type Tests ............................................................................................... 32 3.4.2. Routine Tests .......................................................................................... 35 3.4.3. Field Tests ............................................................................................... 40

4. MATTERS REGARDING TESTS AND ACCEPTANCE CRITERIA..................... 42 4.1. Type Tests ...................................................................................................... 42 4.2. Criteria for Acceptance of Autotransformers .................................................. 43

4.2.1. Criteria for acceptance of factory tests on main components .................. 43 4.2.2. Criteria for acceptance of type tests ........................................................ 43 4.2.3. Criteria for Acceptance of Routine Tests ................................................ 44

TEİAŞ

TEİAŞ-MYD/2015-035.0 1 Autotransformer (400 kV164kV, 400 -

450 MVA) Type Technical Specification

ANNEX -1 TRANSFORMATION RATIOS FOR TRANSFORMERS AT NO LOAD . 45

ANNEX –2 AUTOTRANSFORMER (400/164 kV, 400-450 MVA) LIST OF GUARANTEED CHARACTERICTICS(SPECIFICATIONS) ..................................... 47 ANNEX –2 OTOTRANSFORMER (400/164 kV, 400-450 MVA) GUARANTEED .... 49

ANNEX-3 AUTOTRANSFORMER (400/164 kV, 400-450 MVA DEVIATION LIST . 59

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TYPE TECHNICAL SPECIFICATION FOR AUTOTRANSFORMER (400 kV/164kV-400-450 MVA)

1. GENERAL 1.1. Subject and the scope

This Specification covers the requirements for autotransformer with 400-450 MVA power rates and three phases. The works to be performed as per the contract shall comply with the requirements in the specification covering the issues specified below:

Design and manufacturing of autotransformer with all accessories and auxiliary equipment

Testing related components of the autotransformer and submission of test reports;

Spare parts;

Special tools and tools required for assembly and maintenance

Submission of the drawings, electrical diagrams and the documents concerning assembly, operation and maintenance of the autotransformer for approval;

Transportation of the autotransformers to the locations pointed out in delivery schedule, lowering of them on the rail or platform and hauling them to the spot where they are to be installed.

Assembly of autotransformers

Field tests to be performed before putting autotransformers into operation

Commissioning

The works specified below shall be assured by the purchaser unless otherwise specified:

Reinforced concrete foundation equipped with a rail system and other required construction works;

Grounding system

Appropriate packing for the components during assembly works performed on site

1.2. Standards and documents Unless specified otherwise, design, tests and manufacturing of the autotransformers shall be performed taking the latest editions of the following standards and/or documents into consideration.

STANDARDS SUBJECT ISO 9001:2008 Quality Management System Certificate TS EN 60076-1 Power Transformers Part 1:General (In Turkish) IEC 60076-1 Power Transformers Part 1:General

TS EN 60076-2 Power Transformers – Part 2: Temperature Rise (In

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Turkish)

IEC 60076-2 Power Transformers – Part 2: Temperature Rise For Liquid Immersed Transformers

TS 10902 EN 60076-3

Power Transformers Part 3: Insulation Levels, Dielectric Tests And External Insulation gaps In Air (In Turkish)

IEC 60076-3 Power Transformers Part 3: Insulation Levels, Dielectric Tests And External Insulation gaps In Air

TS EN 60076-4 Power Transformers Part 4: Guide To The Lightning Impulse And Switching Impulse Testing - Power Transformers And Reactors (In Turkish)

IEC 60076-4 Power Transformers Part 4: Guide To The Lightning Impulse And Switching Impulse Testing - Power Transformers And Reactors

TS EN 60076-5 Power Transformers Part 5:Ability To Withstand Short-Circuit (In Turkish)

IEC 60076-5 Power Transformers Part 5:Ability To Withstand Short-Circuit

IEC 60076-7 Power Transformers Part 7: Loading Guide For Oil -Immersed Power Transformers

TST 3791 IEC 60076-8 Power Transformers Part 8:Application Guide (In Turkish)

IEC 60076-8 Power Transformers Part 8:Application Guide

TS EN 60076-10 Power Transformers Part 10: Determination Of Sound Levels (In Turkish)

IEC 60076-10 Power Transformers Part 10: Determination Of Sound Levels

IEC 60076-18 Power transformers - Part 18: Measurement of frequency response

TS 8756 EN 60721 Classification Of Environmental Conditions (In Turkish)

IEC 60721 Classification Of Environmental Conditions

TS EN 60214-1 Tap-Changers -Part 1: Performance Requirements And Test Methods ( Turkish)

IEC 60214-1 Tap-Changers -Part 1: Performance Requirements And Test Methods

TS EN 60214-2 Tap-Changers - Part 2: Application Guide (In Turkish)

IEC 60214-2 Tap-Changers - Part 2: Application Guide

TS 2051 EN 60270 Cables- High-Voltage Test Techniques - Partial Discharge Measurements ( In Turkish)

IEC 60270 Cables- High-Voltage Test Techniques - Partial Discharge Measurements

TS EN 60296 Fluids For Electro-technical Applications-Unused Mineral Insulating Oils For Transformers And Switchgear (In Turkish)

IEC 60296 Fluids For Electro-technical Applications-Unused Mineral Insulating Oils For Transformers And Switchgear

IEC/TR 62271-301 High-Voltage Switchgear And Control gear - Part 301: Dimensional Standardization of Terminals

TS 3033 EN 60529 Degrees Of Protection Provided By Enclosures (IP Code) (In Electrical installations) (In Turkish)

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IEC 60529 Degrees Of Protection Provided By Enclosures (IP Code) (In Electrical installations)

TS EN 50216 Accessories For Power Transformers And Reactors Parts 1 through 6 (In Turkish)

EN 50216 Accessories For Power Transformers And Reactors Parts 1 through 6

IEC 60502-1 Power Cables With Extruded Insulation and Their Accessories For Rated Voltages From 1 kV (Um = 1,2 kv) up to 30 kV (Um = 36 kV) - Part 1: Cables For Rated Voltages of 1 kV (Um = 1,2 kV) and 3 kV (Um = 3,6 kV)

TS EN 60567 Oil-Filled Electrical Equipment – Sampling Of Gases And Oil For Analysis Of Free And Dissolved Gases – Guidance (In Turkish)

IEC 60567 Oil-Filled Electrical Equipment – Sampling Of Gases And Oil For Analysis Of Free And Dissolved Gases – Guidance

TS EN 61181 Mineral oil-filled electrical equipment - Application of dissolved gas analysis (DGA) for factory tests on electrical equipment (In Turkish)

IEC 61181 Mineral oil-filled electrical equipment - Application of dissolved gas analysis (DGA) for factory tests on electrical equipment

TS EN 60599 Mineral Oil-Impregnated Electrical Equipment In Service - Guide of application to use determined results of dissolved and free gases in assessing device status (In Turkish)

IEC 60599 Mineral Oil-Impregnated Electrical Equipment In Service - Guide of application to use determined results of dissolved and free gases in assessing device status

TS EN 61672-1 Electro acoustics - Sound Level Meters - Part 1: Specifications (In Turkish)

IEC 61672-1 Electro acoustics - Sound Level Meters - Part 1: Specifications

TS EN 61869-1 Instrumentation Transformers - Part 1: General Rules( Turkish)

IEC 61869-1 Instrumentation Transformers - Part 1: General Rules

TS EN 61869-2 Instrument transformers - Part 2: Additional requirements for current transformers (In Turkish)

IEC 61869-2 Instrument transformers - Part 2: Additional requirements for current transformers

TS 3989 EN 60156 Insulating Liquids - Determination Of The Breakdown Voltage At Power Frequency - Test Method (In Turkish)

IEC 60156 Insulating Liquids - Determination Of The Breakdown Voltage At Power Frequency - Test Method

TS EN 60137 Insulated Bushing For Alternating Voltages Above 1000 Volts (In Turkish)

IEC 60137 Insulated Bushing For Alternating Voltages Above 1000 Volts

TS EN 60947-1 Low-Voltage Switchgear And Control gear - Part 1:

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General Rules (In Turkish)

IEC 60947-1 Low-Voltage Switchgear And Control gear - Part 1: General Rules

TS EN ISO 1461 Galvanize coating applied on the materials made of iron and steel by hot dipping – Specifications and test methods

TS EN 60641-1 Pressboard And Press-paper For Electrical Purposes Part 1: Definitions And General Requirements (In Turkish)

IEC 60641-1 Pressboard And Press-paper For Electrical Purposes Part 1: Definitions And General Requirements

TS EN 60641-2 Requirements of Pressboard And Press-paper For Electrical Purposes Part 2: Methods Of Tests ( In Turkish)

IEC 60641-2 Requirements of Pressboard And Press-paper For Electrical Purposes Part 2: Methods Of Tests

TS EN 60641-3-1 Requirements of Pressboard And Press-paper used for Electrical Purposes - Part 3: Specifications For Individual Materials - Sheet 1: Requirements For Pressboard, Types B.0.1., B.2.1, B.3.1, B.3.3, B.4.1, B.4.3, B.5.1, B.6.1, and B.7.1 (In Turkish)

IEC 60641-3-1 Requirements of Pressboard And Press-paper used for Electrical Purposes - Part 3: Specifications For Individual Materials - Sheet 1: Requirements For Pressboard, Types B.0.1, B.0.3, B.2.1, B.2.3, B.3.1, B.3.3, B.4.1, B.4.3, B.5.1, B.5.3 And B.6.1

TS EN 60641-3-2 Requirements of Pressboard And Press-paper For Electrical Purposes - Part 3: Specifications For Individual Materials – Sheet 2: Requirements For Pressboard, Types P.2.1, P.4.1, P.4.2, P.4.3, P.6.1 and P.7.1 (IEC 641-3- 2:1992) (In Turkish)

IEC 60641-3-2 Requirements of Pressboard And Pressed paper For Electrical Purposes - Part 3: Specifications For Individual Materials – Sheet 2: Requirements For Pressboard, Types P.2.1, P.4.1, P.4.2, P.4.3 and P.6.1

TS EN 60450 Measurement of the Average Viscometric Degree of Polymerization for New and old Cellulosic Electrical Insulating Materials (In Turkish)

IEC 60450 Measurement of the Average Viscometric Degree of Polymerization for New and old Cellulosic Electrical Insulating Materials

TS EN 60763-1 Laminated Pressboard For Electrical Purposes - Part 1: Definitions, classifications and general requirements (In Turkish)

IEC 60763-1 Laminated Pressboard For Electrical Purposes - Part 1: Definitions, Classification And General Requirements

TS EN 60763-2 Specification For Laminated Pressboard - Part 2: Methods Of Test (In Turkish)

IEC 60763-2 Specification For Laminated Pressboard - Part 2: Methods of Test

TS EN 60763-3-1 Requirements for Laminated Pressboard For Electrical Purposes - Part 3: Specifications For Individual Materials - Sheet 1: Requirements For Laminated Pre-compressed

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Pressboard -Types LB 3.1.1, 3.1.2, 3.3.1 and 3.3.2 (In Turkish)

IEC 60763-3-1 Requirements for Laminated Pressboard For Electrical Purposes - Part 3: Specifications For Individual Materials - Sheet 1: Requirements For Laminated Pre-compressed Pressboard, Types LB3.1A.1 And LB3.1A.2

IEC 60554-1 Specification For Cellulosic Papers For Electrical Purposes. Part 1: Definitions And General Requirements

TS EN 60554-2 Cellulosic Papers For Electrical Purposes - Part 2: Methods Of Test (In Turkish)

IEC 60554-2 Cellulosic Papers For Electrical Purposes - Part 2: Methods Of Test

TS EN 61061-1 Impregnated concentrated, Laminated Wood For Electrical Purposes - Part 1: Definitions, Designation And General Requirements (In Turkish)

IEC 61061-1 Impregnated concentrated Laminated Wood For Electrical Purposes - Part 1: Definitions, Designation And General Requirements

TS EN 61061-2 Specification For Non-Impregnated, concentrated Laminated Wood For Electrical Purposes - Part 2: Methods Of Test (In Turkish)

IEC 61061-2 Specification For Non-Impregnated, compressed Laminated Wood For Electrical Purposes - Part 2: Methods of Test

TS EN 60893-3-5 Insulating Materials - Industrial Rigid Laminated Sheets Based On Thermosetting Resins For Electrical Purposes - Part 3-5: Specifications For Individual Materials - Requirements For Rigid Laminated Sheets Based On Polyester Resins (In Turkish)

IEC 60893-3-5 Insulating Materials - Industrial Rigid Laminated Sheets Based On Thermosetting Resins For Electrical Purposes - Part 3-5: Specifications For Individual Materials - Requirements For Rigid Laminated Sheets Based On Polyester Resins

TS EN ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles - specification and test methods specification and test methods (In Turkish)

EN ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles - specification and test methods

ASTM D1275-06 Standard Test Methods for Corrosive Sulfur in Electrical Insulating Oil

IEC 62535 Insulating Liquids – Test Method for detection of potentially Corrosive Sulfur in used and unused insulating oil

IEC 60616 Terminal and tapping markings for power transformers

IEC 62271-1 High-voltage switchgear and control gear - Part 1: Common specifications

IEEE C57.93 IEEE Guide For Installation and Maintenance of Liquid –Immersed Power Transformer

Purchasing specification of TEIAS for purchasing new insulation oil (attached to this

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specification.

The specification of TEIAS for oil filled in the new transformer that is to be filled new oil

Electrical accessories, components and other auxiliary equipment shall comply with the relevant TSE or IEC Standards even if not expressly mentioned in the standards specified above. Regarding the materials for which these standards are not available, the bidder shall suggest applicable standards provided that the approval of the purchaser is obtained. If equivalent or higher standards are applied, their copies in Turkish and / or English shall be submitted together with the Bid. In case there are differences between TSE and IEC standards written approval of the purchaser shall be obtained about which standard will be applicable for differing matters. Chemical, physical and dielectric characteristics of the materials to be used in manufacturing of the autotransformers shall be in accordance with the requirements specified by ASTM (American Society for Testing and Materials) or DIN (Deutsches Institute für Normung) standards, or the norms used by the countries in European Union. If the standards and / or documents above are amended during the phases after opening the bids received for autotransformers, the amendment or publication in force on the date of bid shall be applicable.

1.3. Operating Conditions Autotransformers subject to purchase order shall be compatible for outdoor use under operational conditions specified below unless otherwise specified in the List of Guaranteed Characteristics. The conditions specified below are normal operationing conditions. The values in the Technical Specifications and its attachments are provided according to these values. In case the purchaser has different requests from these conditions, they shall be specified by the Purchaser prior to bidding process. The manufacturer shall perform its works in conformity with related standards taking the requests of the Buyer into consideration notified before the tender. At the end of these works, the amendments to be made in the Technical Specifications and design shall be presented to approval of the Buyer. - Altitude above sea level : up to 1000 m - Ambient temperature

Maximum daily : +45 °C

Minimum daily : -25 °C

Daily average (24 hours) : below +35 °C

Annual average : not exceeding +25 °C

- Maximum wind pressure : 70 kg/m2 on round surface

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120 kg/m2 on flat surface - Maximum solar radiation : 1000 W/m² - Ice load : 10 mm, Class 10 - Exposure to industrial pollution : Yes (Heavy pollution) - Maximum relative humidity : 95 %

(Average of 24 hours) - Probability of lightning stroke : Yes - Earthquake (*)

Horizontal acceleration : 0,5 g (at the ground level)

Vertical acceleration : 0,25 g

(*) Autotransformer shall withstand the horizontal and vertical earthquake acceleration values with design of it to prevent damage on any of its units (bushing etc.) and the project, image and materials required for its installation at the location where it will operate and the earthquake resistance calculations of the autotransformer shall be submitted by the Contractor. All kinds of gaskets, connection elements etc. required for installation and fixation of the autotransformer manufactured in this way shall be undertaken by the Contractor. 1.4. Auxiliary Power Supplies

Following auxiliary power supplies shall be available at any location where autotransformers will be installed: - Three phase AC system (with neutral) : 380 volts + 10 %, to 15 %, 50 Hz (**) - Single phase AC system (line to neutral): 220 volt + 10 % to – 15 %, 50 Hz (**) - DC system : 110 or 220 volts, + 10 %, - 15 % Autotransformers to be used with 220 Volts DC shall be specified separately after award of the contract.

2. TECHNICAL SPECIFICATIONS 2.1. Nominal values and the performance Transformers within the scope of this specification shall be of the type to be used outside with filled oil (mineral oil) and the characteristics specified below: - Number of winding : 2 - Number of phases : 3 - Rated frequency (**) : 50 Hz - Type of cooling : ONAN/ONAF/OFAF - Rated power

At an ambient temperature of 45C with 1 (one) cooler (heat exchanger) out of operation (MVA) 400

At an ambient temperature of 35C with all coolers (heat exchangers) operational (MVA) (constant over current charging capacity) 450

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Temperature rises For 400 MVA

- At an ambient temperature of 45C with 1 (one) cooler (heat exchanger) out of operation (MVA)

Top oil 55C

Winding 60C

Core surface 75C

Hottest spot of the winding 70C For 450 MVA

- At an ambient temperature of 35C with all coolers (heat exchangers) operational (MVA) (constant over current charging capacity)

Top oil 65C

Winding 70C

Core surface 85C

Hottest spot of the winding 80C Rated voltages High voltage (HV) winding : 400 kV Low voltage (LV) winding : 164 kV Tapping position : Common winding, at the neutral end Kind of tap-changer : On load

Tapping range : +18x 1.33% - 7x 1.33% Tapping voltages

15th tapping : 180,3

13th tapping : 176,3

7th tapping :164,0

1st tapping :147,7

0 tapping : Number of tapping position : 16 Voltage adjustment category : VFVV Tapping powers : 100 % rated power for all taps Temporary overloading : According to IEC 60076-7 Highest System voltages

High voltage : 420V

Low Voltage : 170 kV

Connection group : Yn a0 Insulation of windings and neutral

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grounding method : Step by step insulation (neutral shall be grounded directly)

Impedance voltage (at 400 MVA basis) :

15th tapping (400kV/164kV+8x1.33%) : 13.5% (tol. +5%; -10%)

13th tapping (400kV/164kV+6x1.33%) : -

7th tapping (400kV/164kV) : 13% (Tol. +%)

1st tapping (400kV/164kV+6x1.33%) : -

0 tapping (400kV/164kV+7x1.33%) : 1.4% (tol. +5%; -10%).

No-Load current at 100% rated primary voltage at the main tapping (At 250 MVA basis, 50 Hz),

: % 010

Maximum short circuit power

Maximum short circuit power

At 400 kV network : Infinite

At 154 kV network : 10.000 MVA Insulation levels for windings HV LV Neutral

Full lightning impulse withstand (1.2/50μs)(kV - peak) : 1425 650 325

Switching impulse withstand (kV - peak) : 1050 - -

Induced overvoltage withstand (kV rms) : 630 275

Partial discharge phase to phase at 1,5 x 420 kV voltage : < 150 pC

Insulation levels for bushings : HV LW Neutral

. Full lightning impulse withstand (1.2/50μs)(kV - peak) : 1425 750 325

. Switching impulse withstand (kV - peak) : 1050 - -

. Dry power frequency withstand voltage (kV rms) : 695 355 155

- Minimum creepage (leak path) distance : 10500 4250 1813

Audible sound level at main tap at rated voltage

while all heat exchangers are operational : 75 dB (**) Frequency change range: unless otherwise specified in the regulation concerning electricity market network, the autotransformers should be designed to operate continuously in 49 to 50.5 Hz frequency range, for 10 minutes in 52.5 Hz to 51.5 Hz frequency range for 1 hour at 50.5 to 51.50 Hz frequency range for 1 hour in 48.5 Hz-49 Hz frequency range, 20 minutes in the range from 48.0 to 48.5 and for 10 minutes in the frequency range from 47.5 Hz to 48 Hz as connected to the

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transmission network considering that system frequency may rise to 51.5 Hz or fall to 47.5 Hz in extraordinary conditions, Values and characteristics required for the autotransformers are specified in the list of guaranteed characteristics for information. The purchaser shall prepare the list of guaranteed characteristics, considering the place of use and operational conditions of the autotransformer. Tap voltages for each tap shall be as indicated in Annex -1 within a tolerance of ± 0.5%. 2.2. No Load Energisation HV or LV terminals of the autotransformers shall withstand energizing at no load (no load) without damages in almost infinite number with a voltage that is 1.05 times higher than the value of tap voltage value at any position of tap changer. 2.3. Overloading The Bidders shall guarantee overload capacity required in the List of Guaranteed Characteristics: The bidders shall also provide overloading capacity for periods of 30 minutes based on following assumptions: Temperature rises shall not exceed following values when autotransformer is at main tap with rated voltage load of 300MVA and alternatively 400 MVA power rates and all heat exchangers are operational

Top oil : 70C

Windings : 75C

Core surface : 85C

2.4. Tolerances

In case the values measured for each autotransformer during the Factory Acceptance Tests remain within the range obtained by application of following tolerances to the values under the column of “GUARANTEED VALUES” autotransformer shall be accepted, however, following penalties pointed out in article 2.5 below are to be applied in the case of losses. The tolerance values applicable for rejection:

Total losses : + 5 % No load Active power losses : + 10 % On load Active power losses : + 10 % Deviation of transformation at no load for all tap positions: ±0.5 % Impedance voltages at the rated current

. 400/164 kV : ± 5 %

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. 400/164kV -7x1.33% : - 5%, + 10%

. 400/164kV -8x1.33% : +5 %, -10%

Current at no load(at rated voltage and at 110%of rated voltage) :+ 30 % Partial Internal discharge : NONE Audible noise level : NONE Temperature rise : NONE

2.5. Failure to meet guaranteed values (at the phase of acceptance tests)

In the event the tests performed on autotransformers indicate that the equipment is not conformal to the guaranteed values (“Column of GUARANTEED VALUES”), (provided that the losses are within the tolerances specified above) , the purchaser shall apply the following penalties separately for each autotransformer. No premium shall be granted for specifications that are found to be better than the guaranteed values. a) Losses at no-load: In the case of losses at no load, for each kV rate that is over guaranteed value at 100% or 110% of the nominal voltage a penalty in an amount of 7.000 USD shall be applied (Where deviation is the highest at 110 % or 100 % of rated voltage). b) Losses at load: for each kW value exceeding specified loss at load a penalty amount of 2.500 USD shall be applied. The penalty shall be calculated using the formula given below. L = (2xL1 + L2 + L3) / 4

Where: L1 = means the loss when the tap changer is at the main tapping, L2 , L3 = mean the losses when the tap changer is at the extreme tapping positions (±10%), c) Concerning power losses in cooling system, 3.000 USD penalty shall be applied for each kW value exceeding guaranteed power value.

2.6. Evaluation of Losses (at the phase of bid evaluation) Autotransformers having higher values of losses than the ones specified by TEİAŞ in the list of guaranteed specifications (“REQUIRED” column) shall be rejected. Furthermore, autotransformers with higher values of audible sound level, partial discharge and temperature rise than those specified by TEİAŞ (“REQUIRED” column) in the list of guaranteed characteristics shall be rejected.

2.7. Deviations It is essential that all issues specified in the Technical Specifications are covered one by one by the values given in the List of Guaranteed Characteristics. In the case these values are not met, the bidder shall specify clearly deviations in the list attached in annex. The list of deviations filled by the bidder shall be evaluated by the

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Purchaser in terms of its compatibility with basic specification and applicable standards. At the stage of bid evaluation, the right of the purchaser to accept or reject the bids including technical deviations is reserved. Besides, if any issue is not emphasized in the List of Deviations, autotransformers and all equipments thereof shall be deemed to be in full conformity with the specification. 2.8. Structural Characteristics Materials to be used in manufacturing autotransformers shall be new and of first-class quality materials described in the standards that are free from defects and imperfections and fit for purpose.

2.8.1. Magnetic Circuit (Core)

The autotransformers shall be of the core type with three legs. The core shall be manufactured of high-grade, cold-rolled, grain- oriented, non-ageing silica containing sheet metal laminations having smooth surfaces with high magnetic permeability Attachments shall be cut at 45° and step-lap technology shall be applied. Each lamination (plate) shall have an insulation that will not deteriorate under pressure or impact of hot oil. The steel sheets forming the core and insulation materials thereof shall be so designed that no detrimental changes in physical or electrical properties will occur during the life time of the autotransformer. The laminations of the core shall not be coupled together by means of bolts in the shanks or yokes avoiding formation of hot spots. The structure of core shall be such that removal of minimum number of laminations will be required for removal and replacement of the windings. The core sheets and windings shall be suitably braced to prevent displacement during the transportation or distortion under conditions of possible short circuit. To prevent movements of the core during transport specials side supports shall be placed at each corner. In addition, the core bottom shall be coupled to bottom of the tank. Insulation between the core and the yoke iron shall be so manufactured that it will be able to resist 2 kV, rms at 50 Hz for 1 minute. The core grounding shall be connected to an external grounding (bonding) terminal on the tank from an internal single grounding terminal of the core using a braided copper conductor. Grounding of the core yoke shall be connected also from an internal grounding terminal to an external grounding terminal.

External grounding terminals shall be connected to external part of the tank by means of conductors with proper cross sections. It should be possible to accede to external grounding terminal without removal of the oil in the tank (reservoir) and,

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respective external connections should be removable for tests regarding insulation of the core and yoke from the tank and from each other.

2.8.2. Windings

The windings shall be formed from electrolytic copper conductors insulated with thermally upgraded paper. Epoxy resin impregnated, transposed conductors (CPR2 or equivalent) shall be used in adjustment winding, common (parallel) windings and additionally serial windings, if possible. All windings shall be manufactured from enamel coated copper conductors. The bidders shall specify the type of series winding that they intend to use (such as inter-shielded, zigzag interleaved etc.) Insulation of the serial and common windings shall be graded. At first glance, neutral shall be directly grounded. It will be possible to ground neutral in the future via reactor and to protect it by means of lightning arrester.

The windings shall be so manufactured that insulation ageing shall not occur at temperature changes. The windings and connections shall be manufactured and fixed in a manner to withstand temperature rise foreseen in the construction standard of the autotransformer, overloading conditions, the forces occurring in the axial and radial direction in the case of short-circuits and the dielectric tests specified in technical data. Brazing shall be applied at all current carrying connection spots between conductors, between lead and cable shoes or compression type, multi bolt connectors will be used. All conductor leads must be firmly supported.

400 -450 MVA autotransformers shall be able to operate in parallel with existing 250

MVA and 150 MVA, 380/158 kV +7X1.25% autotransformers. Therefore, transformation rates at no load of the 400 to 450 MVA autotransformers and transformation rates of the 1 to 13th taps of tap changers of existing autotransformers under the load should be the same within tolerances. In the table presented in Annex 1, transformation rates of new 400 to 450 MVA autotransformers and existing 250 MVA autotransformers at no load are provided. Operation of the 400 to 450 MVA autotransformers at 0, 14th and 15th taps in parallel with existing 250 MVA and 150 MVA, 380V/158 kV autotransformers will not be permitted.

Adjustment (calibration) winding shall be in the form of multiple helices. In order to provide the rates specified in the table presented in annex 1, inverted windings may feature varying number of windings. At any rate, average value between the taps shall be 1,33% and total adjustment accuracy shall be ±10% and conversion rates specified in annex 1 shall be complied with. Fiber optical temperature sensors shall be placed at appropriate spots of the windings and magnetic circuit of first batch of autotransformers to be manufactured in the scope of each bidding procedure to ensure the capability to make direct measurement in operation and temperature rise test. The number of the sensors

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shall be according to IEC 60076-2 unless specified otherwise. Locations of the sensors shall be determined by the contractor so that they will be positioned at the hottest spot of the windings as per the design of autotransformer and submitted to approval of the PURCHASER. Highest temperature rise (hot spot) of the winding shall be determined by the calculation method specified in IEC 60076-2 taking results of the temperature rise test as the basis. Highest of the hot spot temperature values obtained by measurement using fiber optical sensors and calculation method as well, shall be taken into consideration in acceptance of the autotransformer. 2.8.3. Tank Unless specified otherwise, tank shall be welded, and its cover will be of bolt coupled type. Tank and the cover shall be manufactured from high quality steel plates. The tank and covers shall be so designed that any internal bays will not be left into which water can be filled; any internal pocket where oil may remaining air by drainage of the tank can be trapped or gas leaking outside can be trapped preventing operation of Bucholz relay while charging the tank shall not be left. Circulation pipes shall connect all points in which air / gas may be collected to gas relay. The tank design shall be designed with solid construction and completion of manufacturing with high quality workmanship and due care shall be observed. The tank should be in a compact structure to withstand strains during transportation, vacuum pressures during oil purification, hydrostatic and dynamic pressures occurring during operation and in particular during short circuits. The resonance frequencies of the tank shall be sufficiently far from 50 Hz and from 100 Hz. All bolts used in manufacturing of the tank shall be made of stainless steel. Tank, cover and storage bolts shall be painted after mounting. Special measures shall be taken to minimize effects of stray flux resulting from high current carrying conductors and from leakage flux by using non-magnetic steel where necessary. Tank and its accessories shall be so designed and manufactured that prevention of any detrimental effect of vibration will be ensured. Welding shall be carried out in accordance with the standards describing welding works completely with application of double welding where tightness is required. To ensure that there is not any oil leak all respective welds shall be subjected to oil leakage tests. Metal continuity shall be ensured between the parts forming the tank and the various pipes, etc. so that they will all be at the same potential.

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If it is not possible to accede to the lower ends of all bushings, manholes shall be provided on the cover to ensure access to the lower part of the bushings. In case reentering type bushings are used, manholes are not required. Inspection covers shall have lifting arms. A manhole in a proper size shall be provided to ensure that tap selector of on load tap changer is treated easily in the field.

The tank shall be fitted with lifting hooks, pulling eyes and jacking pads with ample strength to lift completely assembled and oil filled autotransformer. Jacking pads shall be in the form enabling application of hydraulic jacks even when wheels are removed and the unit is laid down on the ground. The active parts shall have lifting hooks to allow handling and lifting from the tank. The base of the autotransformer shall be suitable for skidding. A flat base or a base plate reinforced with a railed construction designed for skidding parallel to the center lines of the tank shall be available. Required couplings shall be provided to haul autotransformer on the base or adjacent to the base in the directions specified above.

The base of tank shall posses a strong and unbendable frame to support structure the whole weight of the autotransformer on four single-flanged wheel groups that may be turned for rail track and, it will be possible to turn the wheel groups horizontally in two directions that are perpendicular to each other. The wheels shall be appropriate to move autotransformer with 1440 mm on short side, 1440 mm on long side and a rail clearance of 2942mm shall be provided. Wheels brakes to prevent undesired movements of the wheels and that of autotransformer shall be supplied. All the gaskets shall be seated in the slots formed in the shape of grooves around tank made by means of two steel bars welded for this purpose around the tank. The manufacturer shall apply a very efficient gasket system ensuring that no oil leakage will occur during operation. Drawings about operational principles of proposed gaskets shall be submitted with the bid together with the references about trouble-free operation for long periods. The bolts used between the flanges shall be provided with good gaskets to prevent any oil leak. Alternatively, a set of external clamps may be used as a replacement of the gaskets.

The following accessories shall be present on the tank:

Oil drain valve,

Top and bottom valves required for the discharge and filtration of oil,

Taps for oil sampling (top, center, bottom),

Valve for the vacuum pump connection (characteristics and position of the valve shall be determined after placement of the order)

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Four thermometer slots one of which is to be used for thermal image (They shall be positioned on tank cover with equal spaces),

Leak tight valves on the tank side connections of the coolers(heat exchangers),

Flanges for connection heat exchangers to the tank or a separate cooling system inlet

Two tank grounding pads with copper surface or pads made of steel or stainless steel. Grounding pads shall be welded on the base of the tank and located in the middle of two short sides. Each pad shall include clamp-type terminal and bolts suitable for grounding wire connection.

Minimum 2 two Pressure relief device on the top of the tank with tripping contacts. The relief pressure of the relief valve shall be chosen in order to avoid untimely (unnecessary) intervention, in particular, during the short circuits in operation and the successful short circuit test. Pressure valves shall be placed on the tank. A ladder proper in terms of work safety ensuring to climb on the tank shall be available.

A hole buried and flanged on the base of the tank for collecting sediment and sludge as a result of ageing (suitable for tank movement) shall be present (it will be positioned such that it will not hinder sliding of the tank)

For works such as filling oil, discharging oil and vacuuming etc. during the operation, an equipment plate manufactured from stainless material indicating the on – off position of valves shall be mounted on the tank. Plates shall be affixed by using screws of stainless material and the letters or marks shall not be erased in time.

2.8.4. Oil Conservator Oil conservator with legs shall be installed on the side of the tank. Each autotransformer shall be equipped with an oil-conservator capable of containing the variation in oil volume in the tank between the lowest and the highest temperature occurring under the most severe ambient temperature and loading conditions. A small quantity of oil shall be present inside oil conservator at all times at a certain level and the volume of the container shall be sufficient to contain the oil expanding under extreme load and temperature conditions. The conservator shall include a suitable section for the switch oil of on load tap changer. The autotransformer tank oil shall be kept separate from switch oil of on load tap changer. Each oil-filled compartment shall be provided with:

An oil level indicator with alarm contacts for maximum and minimum permissible oil levels

A dehydrating (silica gel) breather device placed at an accessible elevation

An oil filling device

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A drain valve

An inspection manhole

Oil level indicator to be mounted on a vertical side of the conservator shall be legible from ground level. +20 °C level and the minimum and maximum levels shall be marked on the dial. Oil level marks apart from these shall be indicated with the temperatures corresponding to these levels. Oil-conservator shall be fitted with lifting flanges. To prevent absorption of the gasses and moisture by the oil conservator oil shall not be in direct contact with the air. Application of the so called “Atmoseal” system is required. In addition, a dehydrating silica-gel breather shall be placed between the conservator and atmosphere to prevent condensation of humidity. The Bidders may propose also various alternative oil preservation systems with certificates indicating experience of long time operation for assessment by the purchaser. Usage se of conservator divided in two parts with an flexible membrane inserted between the two flanges shall not be accepted. 2.8.5. Bushings and Terminals Bushings shall comply with relevant IEC standards and the electrical characteristics provided in the List of Guaranteed Characteristics. The bushings with nominal ratings higher than 52kV value shall be of oil-impregnated condenser type hermetically sealed without corona. Nominal specific surface leakage path distance (creepage distance) of bushings shall be at least 25 mm/kV. Isolators shall be made of porcelain in brown color. Test tips shall be available on the condenser bushing for measurement. Design of the bushings shall be such that partial discharges and radio interference will be minimized.

Where applicable, bushings of the same voltage shall be interchangeable. A suitable lifting system shall be provided. The bushing type current autotransformers with the characteristics as specified in the List of Guaranteed Characteristics shall be provided on each HV and LV bushing of auto transformers. Bushings shall be dismountable without affecting current transformers. 400 KV and 164KV main terminals shall be made of copper or brass alloy with minimum 40 mm diameter and minimum 80 mm length conforming to implementation place. Condenser bushings shall be equipped with oil indicator and the devices for drain and sample taking.

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The connection members between the bushings and the tank shall be so designed that no damage to porcelain will occur due to the stresses resulting from short circuits in operation and the short circuit type test.

2.8.6. ON Load Tap Changer Voltage regulation shall be performed by means of a three phased, resistance type, on load tap changer to be inserted on the neutral side of the common windings of the autotransformer. On load tap changer shall comply with IEC 60214-1 and 60214-2 standards. Tap changer switch shall be of fast operating type and include independent energy storage capabilities to ensure both manual operation and operation by motor-drive mechanism. Tap changer rated current and tap voltage shall have a wide range (margin) over operation values.

Necessary information should be given in the bids about proposed on load tap changer (oil or vacuum type). If the switch shall be of oily type, autotransformer shall be equipped with a special, internal oil filtration system. Tap changers with proven operational experiences and performance qualities shall be preferred by TEİAŞ. On load tap changer shall be of vacuum type as it is specified in the list of guaranteed characteristics unless specified otherwise. The tap changers under load should be able to perform 100.000 switching operations or operate for 10 years without requiring any maintenance such as lubricating motor drive mechanism and changing oil of tap changer (whichever occurs first).The first maintenance should be carried out after 300.000 switching operations for vacuum switches. For oil type switches, replacement of the contacts in tap changer switches will not be required before reaching 200.000 switching operations. For vacuum type switches, replacement of Vacuum cells will not be required before reaching 600.000 switching operations. Detailed technical specifications of the vacuum tube shall be submitted together with the bid.

Tap changer (diverter switch) and tap selector shall be mounted in main tank of the autotransformer. Switching current circuit of diverter switch on and off and insulation oil inclined to be contaminated directly by this operation shall be placed in a special chamber in a manner to isolate it from insulation oil in autotransformer tank and, it will be connected to a separate cell in oil conservator. A protective relay sensing sudden pressure change in tap changer or instant velocity changes in flow of the oil between tap changer and oil conservator container shall be fitted. A removable bolted cover shall be provided for access to the diverter switch container without opening the main tank or lowering oil level in the main tank. Tap changer (diverter switch) cover shall be provided with a pressure valve to avoid damages that may occur due to pressure. In order to view operating position of the tap, an inspection window shall be provided on the tap changer (diverter switch) cover located on the autotransformer tank.

Oil sampling faucet (valve), valves for oil drain, and oil purification system shall be provided in the chamber of the diverter switch. Oil sampling faucets shall be installed at a proper height by means of a pipe. The tap-changer system shall operate by means of a 3 phase motor-driving mechanism placed outside of the tank. Operation of the motor having two operation

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modes as local and remote controlled operations shall be made only by locally (near mechanism) or only by remote control mechanism. On load tap changer shall be equipped with an over current blocking device impeding change of tap during over current All vertical and horizontal shafts of diverter switch shall be enclosed properly. A removable hand-crank shall also be provided for manual operation of the tap-changer. Blocking of the motor-drive shall be ensured before actually operating control shaft of the crank manually. Hand-crank shall be located at an elevation enabling easy control and it shall be appropriate to apply a force with a rotational moment not exceeding 50 Nm. The direction of rotation shall be indicated beside hand-crank engagement point and the number of crank rotations required for one (1) tap-change operation shall be provided. A manhole shall be provided on the tank in order to access the tap selector easily.

Operational (motor drive) mechanism, local controls and protections of the diverter switch shall be positioned in a cabinet; the cabinet shall be mounted on the tank at a proper height and it shall have following characteristics;

All equipments and hardware shall be mounted inside the cabin at an easily accessible position and, the dimensions of cabinet shall be sufficient to compass these.

Cabin shall have an air and dust proof solid structure; It will meet IP56 protection requirements at least as per IEC 60529 and, it shall be properly protected against condensation.

A transparent window with adequate size shall be located on the control cabin and ensure that position of the analogue indicator and numerator information are viewed easily.

There shall be enough space in the control cabin for the handle to be used for manual control of the tap changer.

The cover of the control cabin for motor drive mechanism shall be so designed that it will not contact with energized sections as it is opened.

It shall be of a compact structure that is movable and opening easily and, it will be installed with a locking mechanism.

A pocket shall be available inside the control cabin in which single line diagram and diverter switch information shall be provided.

There shall be a sufficient number of rails for spare connectors inside the control cabinet in order to be able to perform assembly of the equipment that may be installed in the future.

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The name plates, warning and instruction plates shall be written in Turkish or versions of them both in English and Turkish shall be provided. Technical drawing indicating physical dimensions of control cabinet and positions of placement for the devices and equipments inside the cabinet shall be submitted to approval of Purchaser.

Motor drive mechanism shall include the following sections;

Control switch for Hand /Automatic operation

Control switch for Local - Remote operation

Control switch for Tap (step) Raising/Lowering operation

Removable rotation handle for manual operation

Step-by-step control relay

Mechanically operated tap-position indicator visible through a control window

Tap-changer’s operation indicator

Thermal magnetic protection switch

Thermostat controlled heater

AC internal lightning lamp that is able to turn on automatically as the cover of the control cabin is opened with an extension cable of 1 meter’s length

A receptacle with a rated current value of 10 A

Tap changer counter with minimum six digits (numerator)

Location end switches

Equipment to relay electrically tap position to remote location.

The device required to display operation (on/off status) of tap changer at a remote position

Operation contactors, auxiliary relays

Auxiliary relays operating by means of push buttons and ensuring full operation of contacts and locks between dropping / raising functions.

Terminal blocks for connection to the cabin, auxiliary contacts connected to terminal blocks

Emergency stop button

Control panel shall include following parts; Automatic voltage regulator (It will not be purchased unless specified otherwise by the purchaser

As an item to be supplied for built-in mounting in the control panel in the transformer station: tap position indicator (for remote position), tap changer operation (on/off ) indicator, control buttons for Tap Raising / Lowering and remote/local (near) /automatic position indicators of the tap and tap stop button.

The system of control device used for controlling parallel operation

With a view to control parallel operation of at least "two" autotransformers, parallel operation control device and other necessary elements shall also be supplied for built-in type mounting in the control panel in the transformer station. At parallel operation position, it will be possible to control tap changers by means the control switch if any one of tap changers of the units in parallel are at the same tap

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(level). If the tap changers of the parallel units are not at the same level, parallel operation control shall be blocked. Control Devices for parallel operation and the related images shall be submitted to approval of the Buyer.

Tap changer indicator shall have a transducer with 20 mA output. Transducer outlet shall be 2x (4-20 mA). 1st outlet shall be connected by cable to control panel, 2nd outlet shall be connected by means of cable to SCADA panel and prepared to be ready for operation. In order to remind operators that 400 -450 MVA autotransformers will not operate in parallel with 250 MVA and 150 MVA autotransformers at tap positions 0,14 and 15, positions 0,14 and 15 on display of remote operation shall be in red color. 2.8.7. Cooling System The cooling method for autotransformers shall be OFAF or ONAN type containing heat exchangers mounted on the tank. The heat exchangers shall be of removable type and connected to the tank and / or battery system by means of O- Ring sealed flanges and furnished with butterfly valves that would break oil inlets – outlets. Thus, it will be possible to dismount or install each heat exchanger without putting autotransformer out of operation or discharging oil in the tank.

Heat exchangers shall withstand full vacuum that the main tank may withstand. Connection point for lifting, oil and air discharge plugs shall be provided on each heat exchanger.

At least one (1) spare heat exchanger shall be provided. In case that any heat exchanger in the transformer is dismantled, autotransformer shall be able to operate continuously at specified 400MVA power rate without exceeding specified values of temperature rise. Design and structure of the heat exchangers should ensure vibration free operation independent from wind speed, and atmospheric conditions without oil leakage. Heat exchangers shall have compact structure and coupled firmly to the tank. The heat exchanger shall be at minimum noise level as far as possible without causing any vibration The fan and its motors shall be totally enclosed and weatherproof for outdoor operation. Accidental access to fan blades shall be prevented by a galvanized wire mesh with a mesh size not greater than 25 mm. The motors of the fan and the pumps shall have a high efficiency and low noise level. In order to reduce the transmission of noise and vibration, an approved form of anti-vibration mounting shall be adopted.

Each heat exchanger shall be equipped with an oil pump driven by a motor. The oil pumps in high quality shall have high performance rates. It will be possible to disconnect pump and motor without reducing level of oil in the autotransformer tank.

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An oil flow indicator with an alarm contact shall be provided at the suction side of each circulation pump. Oil flow indicator shall indicate direction of oil flow. Each heat exchanger shall be electrically disconnected and, each unit shall be individually controlled and protected by a circuit breaker. In addition, each motor shall be protected by a contactor equipped with a thermal relay. The control system shall include the device to indicate following data at local and remote positions: - Cooling systems in service - One or more fans or pump motors are out of service, - Absence of supply voltage - Oil flow failure - Failure of operation controls The control and protection equipment shall be housed in a cubicle attached to the transformer tank at an accessible height.

2.8.8. Auxiliary Equipment (Accessories) Each transformer to be procured shall include following accessories. The price of these accessories shall be included in the transformer price: a) Dial type top oil thermometer with an indicator scale, maximum level pointer

and two individually adjustable, electrically separate contacts for alarm and tripping.

b) Hot spot temperature indicator of the winding shall be equipped with 4

individually adjustable contacts having separate electrical circuits one of which is for high temperature alarm, two for cooler controls and one for tripping action. Winding temperature shall be measured by thermal image technique. Thermal sensing element and oil temperature sensor shall be located in a sealed pocket on the cover of the tank. Electrical transmitter shall be provided for remote temperature recorder. A bushing type thermal image current transformer shall be provided on both High Voltage and Low Voltage windings in order to feed the winding temperature thermometer.

c) Buchholz relay mounted on the pipe connecting the conservator to the tank with two floats and independent alarm and tripping contacts shall be equipped with a relay, circuit test equipment and gas sampler device placed at an accessible level (height). The Buchholz relay shall not operate during short circuits in operation and successfully performed short circuit test.

d) Oil level alarm relays for tank tap changers,

e) A gas relay (or equivalent device) mounted on the pipe connecting the diverter switch (tap changer) cell to the tap-changer section in the conservator with a tripping contact,

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f) Butterfly shut off valves at the start and end of each of the above mentioned gas relays,

g) Taps for oil sampling (top, center, bottom); and discharge valves shall be

provided at the bottom and top for oil purification, disposal and filtration. Specifications and locations of these shall be explained in the bid. Furthermore, oil sampling faucet, valves for oil purification and oil disposal system shall be present in the tap changer switch chamber. Oil sampling valve shall be lowered to a proper level by a pipe.

h) Four thermometer slots shall be provided on the tank cover one of which is to be used for thermal image.

i) Sufficient number of pressure relief devices on the top of the tank cover with opening contacts; In operation of pressure valve, to prevent dispersion of the oil over and around the autotransformer, pressure and amount of the flowing oil shall be taken into consideration and, a pipe system in proper diameter and size from valve to the ground of the autotransformer shall be installed. This issue shall be clearly illustrated in an approved drawing.

j) An embedded and flanged hole shall be provided at the bottom of the tank at zero level to collect accumulated dregs and oil residue resulting from ageing so that it will not prevent sliding of the tank,

k) Remote indicator of winding temperature with electrical reset to be mounted as

built in type on the transformer station control panel;

l) In the case of oil discharge from the tank due to any failure occurring in the autotransformer, a device to shut off flow of oil (Conservator shutter mechanism) from oil conservator (expansion container) toward the tank shall be placed between oil conservator and Bucholz relay. This device shall be closed automatically by the dynamic movement of the oil preventing oil flow from oil conservator to tank and thus supplying of oil to failed point as the oil flow increases. The device in question shall be installed at the most proper location to provide efficient operation of the device.

m) Signal relay shall be installed in the oil conservator for determining whether the rubber compensator in the oil conservator functions properly.

n) Chromium-nickel ball valves with stainless steel body and internal parts shall be used in the autotransformer (except for heat exchanger valves and sample taking faucets) with direct flows.

o) Vacuum pump valve ( properties and position of it shall be determined after placement of the order)

p) Sealed (tight) valves on tank side at the location where heat exchanger is coupled to the tank

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q) Autotransformer shall be equipped with a transformer monitoring System (TMS)

2.8.9. Control Cabinet and Wiring Harness

All control cabinets shall be located at a height which may be accessible without using a ladder considering the foundation and height of the transformer from the base. Temperature indicators, fan switches and auxiliary relays shall be positioned at locations on the panel that are accessible also during the operation. The connection points shall be close to the related instruments and accessible when the transformer is energized. Control cabinet of the transformer shall be of rigid construction, weather and dust proof and with a protection degree of minimum IP 56 as per IEC 60529 and, it shall be protected against condensation by suitable means. Suitable heaters with thermostatic element and natural ventilation shall be provided in the control cabinet of the transformer. A suitable lamp equipped with a clean glass safety globe and controlled by a push-button that is actuated by motion of the hinged door shall be provided.

Terminal blocks of cable harness used for auxiliary power, interior cable harness and the cables used for control, protection and alarm on all panels shall be of modular type and made from fire-resistant and non-flammable material. Terminal blocks shall be mounted on metal rails and retained by springs. Distance between the terminal blocks shall be at least 15 cm. Rails shall be grounded. Insulation level of cables in all panels shall not be less than 3 (tested at 2 kV rms according to the ground), sheath quality shall be R2 and, it shall withstand the spreading of flames and resulting temperature around the tank. Alarm and tripping (opening) circuits shall be independent.

Sections of the cables extending from measurement and protection windings of the bushing type current transformers on the autotransformers to the current terminals on the transformer control cabinets shall be at least 6mm2..Terminal blocks shall be selected in conformity with the cable section. Adjacent rows of terminal blocks in all control cabinets shall be separated from each other at an adequate distance. Each row of rail block shall have at least 10% spare terminals for future use. Each terminal shall have a removable marking strip. All electrical connections on external side of the autotransformer shall be transmitted from the terminal blocks in steel pipes or other suitable protective sheaths. The wiring harness inside the cabinet can be of PVC or similar type of oil-proof insulation.

All cable runs along the autotransformer shall be laid inside steel armored multi-core type ducts or alternatively inside steel pipes or flexible conduits made of aluminum. All cable ducting system and / or steel armored multi-core conductors shall be connected with steel cords.

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Conductors shall be terminated with tinned clamping shoes or crimped termination may be used. Ends of all cables adjacent to terminal blocks shall be equipped with lugs for proper diagnosis. The panels shall be provided with sufficient number of cable inlet holes fitted with cable glands and plastic plugs. Color of the control panels shall be in harmony with the color of the autotransformer. Cables shall have colors in conformity with the table below:

- Red, yellow, blue a. c. (Alternative Current) phase connections - Black a. c. (Alternative Current) neutral connections - Green a. c. (Alternative Current) ground connections - Gray d. c. (Direct Current) circuits

Circuit insulation shall be as follows:

- Power frequency withstand voltage 2 kV rms 2.8.10. Insulating Oil This new and unused oil shall meet the requirements of “Specification of TEIAS for purchasing new insulation oil” attached to this specification unless otherwise specified elsewhere. This oil shall not contain any other additives except for DBPC (2,6 di-tertiary-Butyl para-cresol) The insulation oil shall be obtained from naphthenic based raw oil without containing corrosive sulfur and PCB. In any case the bidder shall submit type of the oil to be used to the approval of the purchaser.

2.8.11. Top View and Dimensions

The arrangement of HV and LV terminals and oil conservator shall be submitted to the Employer for approval before manufacturing. The sizes shall be so adjusted that width of the largest part of the autotransformer (including package) will not exceed 3.50 m and its height will not surpass 4.5 m. The Principal dimensions of fully assembled autotransformers shall be submitted together with the Bid. Details in this respect shall be concluded after placement of the order.

2.8.12. Transportation

The autotransformers shall be transported without mounting bushings, oil conservator, cooling units, wheels and other accessories. They shall be transported

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adhering to maximum acceleration (speed) values specified by IEE C57.93, Part 4.3.1 The autotransformers shall be shipped with gas storage source (nitrogen tube) attached on it as a measure against leakages during the transportation. All holes (including the ones on the heat exchanger) shall be closed with blind flanges (plugs). Autotransformers shall not be transferred with oil filled inside. Insulation oil of the transformer shall be shipped in burrels. The transformer shall be shipped together with its own accessories and equipments.

Cooling units, oil conservator, bushings, wheels and other accessories shall be packed in cases suitably protected against corrosion, breakage, shocks and vibration and shipped in conformity with the domestic and foreign shipping rules. Unless otherwise specified, the contractor shall provide vibration and shock recorder devices; these devices shall be mounted on different points of the transformer during shipment. The main frame (chassis) of the transformer shall be suitably designed for transportation on a trailer with low chassis. The units shall be so dimensioned that shipment by seaway and transportation on highways will be ensured. 2.8.13. Painting

Metallic parts of the autotransformers shall be manufactured from corrosion resistant materials and, the surfaces shall be treated in a way to minimize corrosion. All parts of the autotransformers manufactured from corrodible metals shall be painted. The internal surfaces of autotransformers, including those of oil-conservators shall be protected with rust inhibiting paint with insolubility proven in hot oil at 100 °C. The external metal surfaces shall be treated as follows: a) Preparation of external surface

Prior to painting all surfaces shall be subjected to white metal blast-cleaning according to the specification SSPC-SP5-63 of the Steel Structure Painting Council. The primer coating shall not be applied later than 24 hours after sandblasting, and in any case, it will be applied before the start of rust formation on the surfaces sandblasted at the latest.

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b) Primer coat Catalyzed epoxy paints with anti-corrosion pigments shall be used as a primer for the tank, fan and heat exchangers. Synthetic paints may be used also for heat exchangers. c) Finishing coat The finishing coat for the tank, fans and radiators shall be performed by paints pertaining to one of the following categories:

Alkyd and silicone-based paints (30% silicone-co-polymer)

Polyurethane paints

Vinyl paints of various mixtures The paints for any intermediate coats between the primer and finishing coats may be determined by the supplier. The paints used for varying layers of coating shall have color (pigment) differences to enable clear identification of the paints. Minimum thickness of each coat shall be 35 microns. The color of the finishing paint shall be subject to approval of the purchaser. The manufacturer shall submit painting method intended for application to approval specifying in particular nominal thickness value of each coat. Painting of the autotransformers shall be completed before performance of routine tests. Finished surfaces with top coat shall be properly protected against possible damage during transport and installation. Manufacturer shall supply a sufficient quantity of touch-up paints in order to repair (touch up) damages in paint coating.

Regarding the parts to be galvanized, coating operation shall be performed by using hot-dip process as specified in TS EN ISO-R1461.

2.8.14. Name plates and Plates Each autotransformer shall be provided with two nameplates affixed in diametrically opposite positions on the long sides of the tank. The plates shall be provided with diagrams for 400 MVA and 450 MVA power rates Motors, relays, bushings, on-load tap changer and all other devices as well as cable and connection terminals shall be labeled with name plates containing information specified in respective IEC standards. All name plates and plates to be used outside shall be made of stainless steel or approved non corrosive material to be fixed with stainless steel screws and the letterings will be indelible in time. The information on identification plate, warning and instruction plates shall be in Turkish or repeated in Turkish beside the original and submitted to approval of the Purchaser. The name plates shall indicate all information specified below:

Manufacturer’s trade mark or name, country and city where manufactured,

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Buyer’s purchase order No,

Item code number

Serial number and type designation,

Year of manufacture,

Rated voltage,

Transformation ratio and taps,

Short circuit current (kA)

Short circuit current period (thermal) (s)

Insulation level (kV)

Type, current, serial no, insulation level of on-load tap changer,

Current transformers (Current, transformation ratio, class)

Brand and type of insulating oil

Net weight Core Windings Tank and accessories Oil weight Complete unit

Gross weight for transportation of the heaviest part, Other relevant information specified in IEC 60076-1.

Recommended operational temperatures of fan groups and pumps shall be written on the plates. The scheme illustrating the windings and connections of each autotransformer and the plan view of the physical connections of current transformers and terminals shall be included in the identification plate. The diagram of cooling system shall be provided. Each terminal shall be identified with a plate. Two separate plates shall be prepared for both 400 MVA rated power and 450 MVA rated power rates. Maximum ambient temperature and conditions of the heat exchangers shall be specified entirely on these plates. To remind the operators that 250 MVA and 150 MVA autotransformers will not operate in parallel with 400 and 450 MVA autotransformers at tap positions 0,14 and 15 tap positions 0.14 and 15 on the plate shall be marked in red color.

3. TESTS

3.1. General

Unless specified otherwise in this specification, the tests shall be performed according to the standards listed in Article 1.2. 3.2. Tests On Components At factory

All components shall be subjected to routine tests specified in relevant standards before they are installed on the autotransformer.

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All components (copper, magnetic sheets, insulation materials, on load tap changers, bushings, current transformers, radiators, relays ... etc.) should be subjected to routine tests in the factory of the Contractor or the Subcontractor according to the relevant standards they are installed on the autotransformer. The purchaser reserves the right to send its representatives to these tests. Detailed test reports on successful completion of routine tests performed on all components according to the relevant standards shall be provided by the Contractor for evaluation by the purchaser.

3.3. Tests on the non-tanked transformer during manufacturing – Test with low voltage Repetitive impulses

If there is not any change in the design, this test shall be performed like short circuit test. In case this test has been performed, the test reports shall be submitted to the Acceptance Committee during the Factory Acceptance Test together with the reports of the tests performed by the Contractor at the production phase and, they will be attached to the Factory Acceptance test reports.

Upon request of the Buyer, following tests shall be applied to autotransformer prior to placement of it on the tank in accordance with the applicable IEC / TSE rules. The PURCHASER reserves the right to send its representatives to monitor these tests. The measurement with low-voltage repetitive impulses will be carried out on autotransformer that is not placed on the tank before insulation treatment using low-voltage pulse generator of type 1.2/50 µs, full wave. It can be expected that switching pulses with a duration varying in the range from 5 to 100 µs might lead to higher over voltages in some portions of the winding due to excitation of resonance at some natural frequencies. If such cases are feared, the tests will be repeated with low-voltage switching pulses with a front duration to be determined jointly by the purchaser and the Manufacturer.

a) Measurement Of Transmitted Voltages To on-load tap changer The impulses will be applied in sequence between one, two and three HV terminals and ground. HV terminal that the impulse is not applied shall be grounded via a resistor with 500

/ nominal phase value. The LV terminals shall be first open circuited, and they shall be solidly grounded in subsequent tests. The neutral terminal shall be grounded directly. The following measurements shall be carried out:

Applied voltage,

Voltage between the taps of the windings and ground

Voltage between taps which are electrically close one another

Voltage between the first and the last tap of the regulation range and between the contacts of the pre-selector (if any).

TEİAŞ



Measurements shall be performed at the highest and lowest positions of on-load tap-changer and at the intermediate tap as well. If the voltage distribution of the tapped winding is found uniform, the number of measurements between couples of taps and between taps and ground can be reduced if it is deemed appropriate. The tests described above shall be repeated by applying the impulses to LV terminals; HV terminals shall be first open and then they will be grounded directly for the second test. On the basis of the results of the above tests, inspection will be made to observe if over voltages transferred between taps and between taps and grounds are lower than the relevant BIL as the impulse with an amplitude equal to the relevant BIL applied at HV and LV terminals.

b) Measurement of induced voltages in series windings and on the LV terminals Pulses will be applied in sequence between one, two and three HV terminals and ground. HV terminals that are not subjected to pulse shall be grounded via a resistor with 500

/phase value. LV terminals shall be at first open circuited and in subsequent tests

,first they will be grounded directly and then grounded through a 400 resistor. The neutral point shall be grounded. Oscillographic records will be kept indicating applied voltage, the voltage across the series winding between LV terminals and the voltage between each non-grounded LV terminal and ground in each test. Tests shall be performed for the mean, the highest and the lowest positions of the tap-changer. c) Measurement of induced voltages on HV terminal Pulses shall be applied in sequence between one, two and three LV terminals and ground. LV terminals to which impulses are not applied shall be grounded through a resistor

with 500 / phase resistance value. HV terminals shall at first be open circuited and in a subsequent test they will be grounded directly. The neutral terminal shall be treated as specified in the foregoing items. For each test, oscillographic records shall be kept and indicate applied impulses, induced voltage between the couples of HV terminals and between each non grounded HV terminal and ground. Tests will be performed with the tap-changer in the mean, highest and the lowest tap positions. 3.4. Tests on fully assembled autotransformer at factory High precision instruments shall be used, in particular:

Errors in transformation ratio checks shall not exceed ±0.2%,

TEİAŞ



Errors in oil and ambient temperature measurements shall not exceed ±0.2°C,

In measurements of losses and no load currents:

Current and power transformers shall be in class 0.2 and it will be certain(known) that relevant errors will be within ±0.02 %

Voltmeters and ammeters shall be in class 0.2 or they will be more precise.

Watt meters used for low power factor shall be in class 0.5 or they will have better sensitivity;

All measurement systems used in the tests certified according to ISO 9001:2008 regulations; they should be accurate with periodical calibrations performed and measurement systems that are certified and sensitivity of which is ensured as per IEC 60076-8. 3.4.1. Type Tests i) Short-Circuit Withstand Test Unless otherwise specified, short circuit test shall be carried out according to the procedure laid down in IEC 60076-5.Dynamic short circuit withstand capacity shall be proven by a test and, 9 short circuit withstand tests shall be performed as indicated below. Thermal resistance to short circuit shall be demonstrated by calculation. The duration of short circuit current to be used for calculation of the thermal resistance shall be 3 seconds. Duration of short circuit is within 0,5 seconds with ±10 %tolerance. Calculation of the peak and active current of the short circuit shall be made by taking the equivalent impedance of the power supply as ZERO. This compensates the fact that the voltage source in operation may be from 380 kV to 420 kV peak and, rms current tolerances shall be in conformity with IEC standards. In calculation of the

peak value of current k2 factor shall be taken as 2,69 according to IEC 60076-5 (in conformity with 4.2.3. article). Test schedule shall be schedule permitted in the IEC standards. However, test schedule shall be approved by the purchaser prior to test. 9 short circuit tests shall be applied as LV terminals are exposed to short circuit (3 at main tapping, 3 at highest tapping, 3 at lowest tapping). Test procedures shall assure that the test current will exceed the specified peak values in each phase. It will be ensured that test current in each phase will exceed the specified peak values three times by:

Synchronizing the closing time of the short circuiting breaker as the test is performed with the 3-phases;

Changing cyclically the phase under test when test is performed with a single-phase.

Each phase is applied with specified test peak current minimum three times. During the test the following measurements and checks shall be carried out:

TEİAŞ



a) Oscillographic records of applied voltages and currents used to check the

values and the duration; b) Measurement of autotransformer short circuit inductance before and after test

(Measurements shall be performed within ± 0.1 accuracy.)

c) For informative purposes, SFRA (Sweep Frequency Response Analysis) at the incept and termination of short circuit

Following checks will be made after completion of all short circuit tests:

a) All routine tests including dielectric tests shall be repeated for 100 % of the foreseen test values

b) Visual inspection of autotransformer out of tank; at the same time an

inspection is to be performed studying the pictures taken before the tests to observe if any deformation has occurred at the connections.

Short circuit test performed in the conditions specified above shall be deemed successful in the following cases if:

a) Star equivalent inductance values measured before and after the tests do not differ more than 1% (one percent),

b) Routine tests are successful as well,

c) Visual inspection and photos of non thanked autotransformer indicate that no

failures or defects have occurred (no deformation or displacement of windings, connections, support structures; non existence of flashovers initiation, etc.).

The axial compression of the windings shall also be checked for comparison with the compression applied before short circuit type test. Relief valve and Buchholz relays will not be operated during the test, Tank and the bushings shall withstand overpressures and vibrations without any damage or any oil leak. ii) Temperature-Rise Test: Test shall be performed according to the method explained in IEC 60076-2 using short circuit test method at rated power of 400MVA and 450 MVA When performing the test at rated 400MVA power a heat exchanger selected by the representative of the administration shall be put out of operation and the limits (range) of temperature rise will be determined based on this condition.

TEİAŞ



Temperature Rise Test shall be performed by taking spare heat exchanger out of operation at the highest tapping position while the autotransformer is loaded with total losses at this tap. Winding resistance shall be measured by using 0.2 class or more precise measurement devices. Oil temperature shall be measured within ± 0.2°C tolerance with more precise accuracy. Losses shall be measured during the test at a temperature that is as close to the reference temperature as possible. Winding hot-spot temperature rises shall be determined as specified in IEC 60076-2 by using calculations based on the temperature rise type test results accomplishing direct measurement with fiber optical sensors. Maximum values measured by two methods shall be in conformity with the guaranteed values. The number of sensors shall be minimal twelve(12). Locations of the sensors shall be determined by the contractor according to design of autotransformer so that they will be present at the hottest point of the windings, core and oil and submitted to approval of the PURCHASER. Unless specified otherwise, "Hot Spot measurement" shall be carried out on the first autotransformer delivered in the scope of placed order using Fiber Optical System. Chromatographic analysis of the gases soluble in oil should be performed before and after the test. Oil samples shall be taken from the lower part of the autotransformer and from the same valve (faucet). Analysis shall be in conformity with IEC 60567. Results of gas analysis shall be evaluated as specified in IEC 60076-2. Limit values are specified in 60076-2 Table D.2. The evaluation of results according to this table;

In case gas release rate is less than 1st limit value, test result will be deemed to be satisfactory,

In case gas release rate is between 1st limit value and 2nd limit value, then 2 years shall be added to the guarantee period specified in the contract for all transformers in the same type.

In case gas release rate exceeds 2nd limit value, then the transformer shall be rejected.

iii) Measurement of zero-sequence impedance(s) on three-phase transformers The measurement shall be carried out according to the procedure specified in IEC 60076-1. Measurements shall be made only on the principal tap. Zero sequence magnetizing impedance shall be measured by energizing no load autotransformer applying a zero sequence at a proper value conformal with test installation. iv) Measurement of the harmonics of the no-load current The harmonics of the no-load current shall be measured and the size of harmonics shall be indicated as percentage (rate) of main component.

TEİAŞ



v) Vacuum test on tank of assembled transformer Preferably, test shall be performed after the temperature rise test in a condition that there is no oil in the tank but magnetic circuit and winding are installed and auxiliary hardware is directly connected to the tank. Test pressure in the tank (residual pressure) shall be 3 mm Hg or less. The tank shall be held under vacuum during the tests period of 6 hours. Permitted maximum loss of vacuum in the test should not exceed 2 mmHg when vacuum pump is disconnected. Permanent deformations of the tank occurring during the test shall be noted. vi) Pressure test on tank of assembled transformer The tank shall be filled with autotransformer oil at room temperature to measure static overpressure of 1.5 ATM at the bottom of the tank. Duration of the test shall not be less than 24 hours. Oil leaks should not be observed from the tank, the cover and the conservator at the end of the test. vii) Measurement of audible sound level As per the procedure specified in IEC 60076-10, measurement shall be performed in 450 MVA operation condition of autotransformer. The measurements shall be made at a distance of 2 m from basic emission surface viii) Determination of transient voltage transfer characteristics (IEC 60076-3) ix) Assessment of tank suitably for transport (IEC 60076-1) It shall be assessed on the completed autotransformer according to the documents submitted for approval. x) Determination of transformer weight arranged for transport (IEC 60076-1) It shall be performed by calculation and / or weighing methods. If calculation method is to be used, the contractor shall submit the weights and calculations regarding the materials used to the Acceptance Committee. xi) Measurement of the fan and pump motors power consumption (IEC 60076-1) 3.4.2. Routine Tests Routine tests shall be performed on each supplied autotransformer. Tests shall be performed at any ambient temperature in the range from 10°C to 40°C.

TEİAŞ



All external components and auxiliary equipments that may affect the performance of autotransformer during the tests shall be mounted appropriately in specified locations. Routine tests are specified below. a) Measurement of winding resistance It shall be measured according to the procedure specified in IEC 60076-1. Low Voltage (164 kV) winding DC resistance shall be measured for all tap positions. High Voltage (400 kV) winding DC resistance and series winding resistance shall be measured at highest, lowest and main tap positions. Test current and winding temperature used in the measurement shall be written in the test report. b) Measurement of voltage ratio and check of phase displacement Voltage transformation ratio shall be measured at all tap positions according to procedure specified in IEC 60076-1. c) Measurement of capacitance and dissipation factor Measurement shall be carried out between 400 kV-164 kV winding and tank. Top oil temperature of the autotransformer, ambient temperature and humidity percentage

(%) should be recorded and tan percentage (%) value should be reduced to 20 ºC

considering the top oil temperature. Tan % value reduced to 20 ºC should be less than 0,5.

% tan measurements shall be carried out for all condenser bushings of the autotransformer. C1, C2 and C1+C2 capacitance values shall be measured in the

bushings. The following values shall be valid in the bushings: % tan (C1) ≤ 0,5 and

%tan (C2) ≤ 1. Tests of the bushing performed in the factory according to related standards shall be attached to the Factory Acceptance Test reports. d) Measurement of DC insulation resistance The measurements shall be carried out between 400 kV+164 kV winding and tank (at 0, 15, 30, 45 and 60 seconds and 10 minutes) by 5000 Volt DC insulation resistance test device (The results should be reduced to 20 °C considering the top oil temperature). Besides, the insulation resistance between core / tank, clamp / tank and core / clamp shall be measured by using (1 minute) 2500 Volt DC insulation test device. Dielectric absorption ratio (60 / 30 second) and polarization index (10 / 1 minute) shall be calculated for autotransformers. e) Measurement of short - circuit impedance and load loss It shall be measured according to the procedure specified in IEC-60076-1. Measurements shall be carried out at highest, lowest and main tap positions.

TEİAŞ



f) Measurement of No-Load loss and current It shall be measured according to the procedure specified in IEC 60076.1. g) Dielectric withstand tests Unless specified otherwise, dielectric withstand tests shall be performed according to IEC 60076-3.

1) Separate source AC withstand voltage test (Article 11)

2) Induced overvoltage withstand test (induced AC voltage test)

During the inducted overvoltage test, two LV (164 kV) terminals shall be grounded and, the tap changer shall be adjusted to the position minimizing the voltage inducted at LV terminal that is not grounded with the neutral terminal. For inducing 630 kV rms between the tested HV terminal and the ground, autotransformer may be powered (energized) from the LV terminals which are grounded with neutral.

3) Full wave lightning pulse test

Lightning pulse test at neutral point shall be performed by applying 1 reference pulse and 3 full wave pulses at the highest level in which all windings are active.

4) Test with lighting impulse chopped on the tail

Test, shall be performed together with full wave lightning impulse test.

5) Partial discharge measurement

After all dielectric tests of autotransformers are performed internal partial discharge measurements shall be carried out as an additional test as specified by IEC 60076.3 for the quality control of insulation, Autotransformer shall be energized by three phases. Voltage levels, durations and application sequence with approved maximum partial discharges shall be as specified by the List of Guaranteed Characteristics. On the other hand, internal partial discharge from phase to phase at 1.5 x 420 kV rms shall not exceed the pC value specified in the List of Guaranteed Characteristics. In addition to that, if measured partial discharges are found at a level that is not negligible the place of internal partial discharge shall be determined preferably by an ultrasonic type detector and, it will be removed. Practically autotransformers shall be without partial discharge at the maximum operation voltage.

TEİAŞ



6) Switching impulse test

Switching impulse test shall be performed before measurement of partial discharge as a routine test in addition to induced over voltage test. Test shall be performed according to IEC 60076.3. Test shall be performed at the highest tap position in all phases in which all windings are in operation The sequence of performing dielectric tests is as follows:

Switching impulse voltage test,

One reduced full wave at between 50% and 75% of the full test voltage,

One full wave at 100% of the full test voltage,

One or more reduced chopped wave,

Two full chopped impulses,

Two full waves at 100% of the full test voltage,

Separate-Source AC withstand voltage test,

Induced overvoltage withstand test,

Partial Discharge Measurement, h) Tests on on-load tap changers, operation test For performance of the test the procedure specified in IEC 60076-1 shall be complied with. i) Leak testing with pressure for liquid immersed transformers (tightness test)

Test shall be performed in conformity with the procedure in IEC 60076-1 but 1.5 ATM pressure will be applied. j) Checking the ratios and polarity of built-in current transformers The reports of the tests performed at the production phase of the current transformers in the bushings performed at manufacturing phase and polarity and transform ratio values as well, shall be submitted with the acceptance test reports. Ratios and polarities shall be controlled if requested by the test committee. k) Quality control of paint application The thickness and adhesion of the film shall be measured at ten points chosen at random on the painted surface of autotransformer. Total paint thickness as well as the thickness of individual-coats shall be measured by employing a “Paint Inspection Gage”. The mean value of each paint coat shall not be lower than the relevant nominal value specified by the Manufacturer. Any lower value and permitted lowest limit for each coat shall not be admitted.

TEİAŞ



The film adhesion shall be verified by the cross-cut method specified in DIN EN ISO 2409 standard. The degree of alteration shall not be higher than Gt1. l) Routine tests on welded joints Routine test reports on the welded joints performed by the manufacturer shall be submitted. m) Measurement of magnetizing current Magnetizing current shall be measured at the highest, lowest and main tap positions in the low voltage winding (164 kV) and at the highest tapping position in the high voltage winding (400 kV) and, magnetizing current shall be measured at 10 kV AC voltage. n) SFRA (Sweep Frequency Response Analysis) Test Test procedure shall be decided by mutual agreement between Buyer and Contractor. o) Autotransformer oil tests The conformity of the insulating oil to be used in autotransformers to the Transformer Oil Specifications in ANNEX-4 shall be certified by test reports and submitted to the purchaser for approval. In case it is not certified, all tests of offered oil shall be performed according to the Transformer Oil Specifications in ANNEX-4. In acceptance phase, the following tests shall be performed on the oil samples to be taken from each autotransformer checking its conformity to the Oil Specifications in ANNEX-5 and, the contractor shall guarantee that used oil is of the same brand and type with the offered oil. Power Factor (Doble, 25 °C+100°C), Dielectric withstand, Acidity, Interfacial tension, Density, Viscosity, Number of colors, Water quantity q) Dissolved gas analysis in oil. Dissolved gas analysis in oil shall be controlled by performing chromatographic analysis. Test shall be performed according to the procedure specified in IEC 60567. Assessment of gas analysis shall be performed according to IEC 61181. r) Inspection of the fittings and all protective devices related to autotransformers

TEİAŞ



3.4.3. Field Tests After the completion of the installation of the facilities, following tests shall be performed in the presence of the representatives of the Buyer for each transformer supplied by the Contractor before putting it into operation. a) Measurement of winding resistance Test shall be performed according to the procedure specified in IEC 60076-1. Low voltage (164 kV) winding DC resistance shall be measured in all tap positions, High Voltage (380 kV) winding DC resistance and series winding resistance shall be measured at highest, lowest and main tap positions. Test current and the winding temperature used in the measurement shall be written in the test report.

b) Measurement of voltage transformation ratio and checking phase shift Voltage transformation ratio shall be measured at all tap positions according to procedure specified in IEC 60076-1. c) Measurement of capacitance and loss factor Measurement shall be carried out between 400 kV-164 kV winding and the tank. Top oil temperature of the autotransformer, ambient temperature and humidity

percentage (%) should be recorded and tan % values should be reduced to 20 ºC

considering top oil temperature. Tan % value reduced to 20 ºC should be less than 0,5.

Tan % measurements shall be carried out for all condenser bushings of the autotransformer. C1, C2 and C1+C2 capacitance shall be measured in the bushings.

Following values shall be valid in the bushings: %tan (C1) ≤ 0,5 and %tan (C2) ≤ 1. d) Measurement of DC insulation resistance The measurements shall be carried out between 400 kV+164 kV winding and the tank (at 0, 15, 30, 45 and 60 seconds and 10 minutes) by 5000 Volt DC insulation resistance test device. (The results should be reduced to 20 °C considering the top oil temperature). Besides, measurement of the insulation resistance between core / tank, clamp / tank and core / clamp shall be done by using (1 minute) 2500 Volt DC insulation test device. Dielectric absorption ratio (60 / 30 second) and polarization index (10 / 1 minute) shall be calculated for autotransformers. e) Measurement of magnetizing current Magnetizing current shall be measured in the low voltage winding (164 kV) at the highest, lowest and main tap positions and in the high voltage winding (380 kV) at the highest tap position and magnetizing current shall be measured at 10 kV AC voltage f) SFRA (Sweep Frequency Response Analysis) test

TEİAŞ



Test procedure shall be decided by mutual agreement between the purchaser and the Contractor. g) Autotransformer oil tests Oil drums shall be sealed. After transformer oil is taken into the boat / tank (after necessary transformation (discharge) operation is performed in conformity with the procedure), sample oil shall be taken from the 1st boat/tank under supervision of the representatives of the related Group Directorate and Contractor and a protocol will be signed regarding this procedure. Minimum 1.5 liter of oil sample shall be taken by the contractor for fulfillment of the tests specified below and, it will be delivered to the chemical Laboratory under the responsibility of TEİAŞ with a minutes The analysis to be performed with oil sample taken from the first boat/tank: Power Factor (Doble, 25 °C+100°C) Acidity, Interfacial Tension Number of colors Water quantity TQLG (Total Quantity of Liquefied Gas)

Dielectric resistance test of oil samples taken from each boat/tank shall be performed in the field by the contractor under supervision of the representatives from Regional Management (including tests of the sample taken from the first boat/tank) The results of breakdown voltage tests shall be higher than 60 kV

After oil that is found appropriate according to the tests above is pumped in the transformer and oil is kept at rest for a period determined by the contractor, a protocol shall be drawn up under supervision of the representatives of the related Regional Administrations and the Contractor and, the oil sample taken in a quantity of 2.5 liters shall be submitted by the Contractor with the minutes to the Chemistry Laboratory under the responsibility of TEİAŞ for performing the tests specified below. Analysis to be performed with oil sample to be taken from the transformer reservoir filled with oil: Power Factor (Doble, 25 °C+100°C) Dielectric withstand Acidity Interfacial Tension Number of Color Water Quantity TQLG (Total Quantity of Liquefied Gas) Total Quantity of Liquefied Gas should be max. 1%, amount of water should be max.5ppm. Any charge will not be requested from the contractor for the tests specified above.

TEİAŞ



h) Cable connections between cells, cabinets, boxes and terminal blocks shall be checked for connection of the transformer station to the central control panel. ı) Proper operation of on load tap changer, all protections, alarms, indicators and control devices including the remote controls shall be checked. i) Vacuum Leak Test (according to IEC 60076.1) 4. MATTERS REGARDING TESTS AND ACCEPTANCE CRITERIA Values and specifications requested in the Type Technical Specifications and the List of Guaranteed Characteristics are minimum values and specifications requested by the purchaser (the Administration). In case better values or specifications are offered by the bidders, the bidder shall not claim any right whatsoever. The bidder offering the better values or specifications shall be preferred in case the prices in the bids are equal. 4.1. Type Tests

I) The bidders/ contractors shall submit the certificate about type test of short circuit performed on the autotransformer with three phases having the same characteristics with the autotransformer subject to tender by an accredited laboratory in conformity with the version of IEC 60076-5 standard released on 07.02.2006.

In the cases that short circuit type test certificate is not issued or the issued certification about short circuit type test does not pertain to an autotransformer that have not the same characteristics with the auto transformer subject to bidding described in the tender documents or it is not in conformity with the version of IEC 60076-5 standard published on 07.02.2006; the contractor shall ensure that short circuit tests are performed by an accredited laboratory as free of charge without claiming any expenses from the Administrator and, short circuit type test certificate shall be submitted to the Administration. Submission of short circuit type test certificate is essential. However, in case short circuit test report is submitted before delivery of the certificate; it shall be stipulated that there is not any matter in the report hindering successful performance of short circuit type tests and issue of short circuit type test certificate; provided that entire responsibility shall be undertaken by the Contractor until short circuit type test reports are submitted to the Administration, shipping orders for the power transformers manufacturing and factory acceptance tests (type + routine tests) of which are completed may be issued. Payment for shipped autotransformer / autotransformers shall be made. Short circuit type test certificate shall be submitted to the Administration within 120 (one hundred and twenty) days following the completion of the short circuit tests. Electrical specifications, windings, insulation distances, material characteristics, winding support and pressure and bushing and on- load tap changer connections of the offered autotransformer and the original (prototype) autotransformer on which the short circuit type test has been performed shall be the same.

TEİAŞ



In cases that manufacturers intend to make small design variations in the original (prototype) autotransformer on which the short circuit type test is performed including changes in the quantity of oil and changes in the magnetic core; the Manufacturer shall notify the Administration about reasons of the requested changes, Technical instructions indicating that the aforementioned changes do not reduce the capacity of the autotransformers to withstand electro-dynamic forces informing all design and application project drawings the Administration. Design changes made without notifying the Administration shall necessitate the performance of the short circuit type test free of charge. On load tap changer subjected to type tests routine tests specified by respective standards independently from autotransformer shall not necessitate repetition of the short circuit type tests. Reports for the type tests included in the related standards of the tap changers and high voltage (170 kV and 420 kV) bushings (performed in an accredited laboratory or approved by an accredited organization) shall be submitted to the Administration together with the bid / approval documents.

In case values differing partially from the values in the Type Technical Specification are applied in the short circuit type test performed in an Internationally accredited laboratory under the supervision of the representatives of the Administration and if a short circuit type test certificate is issued by the respective laboratory assessing that requirements of the applicable standards are met and such a certificate is accepted by the administration and the bid prices are equal, then the bidder performing Short Circuit Type Test in conformity with the Type Technical Specifications shall be preferred by the Administration. ii) AUTOTRANSFORMER (400 kV/164 kV) TYPE TECHNICAL SPECIFICATION

3.4.1. Type Tests - outlined in sub clauses ( ii ), ( iii ), ( iv ), ( v ), ( vi ), ( vii ), ( viii ), ( ix ), ( x ) and ( xi ) shall be performed without imposing any charges on the Administration, even though the related test reports are submitted.

4.2. Criteria for Acceptance of Autotransformers 4.2.1. Criteria for acceptance of factory tests on main components All routine tests applied on main components shall yield positive results within allowed tolerances. The negative result of a test shall not imply the rejection of ordered materials but defective component will be rejected. These test reports prepared by the manufacturer shall be submitted to the acceptance committee before start of acceptance tests in the factory. These reports shall also be attached to test and inspection protocol prepared after the acceptance tests. 4.2.2. Criteria for acceptance of type tests The type tests specified above shall be performed on the first autotransformer manufactured within the scope of the contract with participation of the representatives of the Administration in an accredited laboratory or in the laboratory of the Manufacturer if it is approved by the Administration.

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Positive results shall be obtained from all type tests. In case a type test results unfavorably, the autotransformer yielding negative result shall be rejected. However, if the Manufacturer makes design change and undertakes repeating all of cited type tests at the Contractor's expense in a reasonable time, the repetition of the tests is accepted without granting any time extension provided that the authority of decision making is reserved only by the Administration. Before type tests are completed on the first autotransformer other autotransformer / autotransformers may be manufactured by the Manufacturer apart from the first autotransformer provided it is approved by the administration and full responsibility is undertaken by the Contractor. In case performance of factory acceptance tests of autotransformer / autotransformers manufactured in this way is requested by the Manufacturer; shipment and / or payment of neither power transformer shall be made until type tests are completed successfully even if the autotransformer / autotransformers are escrowed after the favorable factory acceptance tests and delivery date of escrowed autotransformers for which factory acceptance tests are completed shall be deemed as the type tests are completed successfully. 4.2.3. Criteria for Acceptance of Routine Tests Routine Type tests specified in Article 3.4.2 of the Technical Specification shall be applied on all autotransformers presented for approval. Beginning date of tests shall be notified to the Administration 15 (fifteen) days before if the tests will be performed in the country and 30 (thirty) days before if the tests are to be performed abroad. Positive results shall be obtained from all routine tests. If negative results are obtained from any of these routine tests, the problematic part shall be replaced or the problem shall be solved at the Contractor's expense if subject test result is considered to be harmful for the operation of the autotransformer by the Administration. In case paint inspection results unfavorably, Administration has the right to request repainting of the autotransformer as free of charge. Routine Tests shall be performed in the laboratory of the manufacturer with the participation of the representatives of the Administration. The laboratory of the manufacturer shall be accredited or the calibrations of the devices to be used in the tests shall be performed by a certified body and accredited organization. Calibration certificates shall be submitted to the Inspection and Acceptance Committee before the tests. All manufacture controls and tests shall be performed under supervision of the representatives of the Administration at the contractor's expense.

TEİAŞ



ANNEX -1 TRANSFORMATION RATIOS FOR TRANSFORMERS AT NO LOAD

400/450 MVA – 400/164kV + 8 x ~ 1 .33%; - 7 x ~ 1 .33% AUTOTRANSFORMERS

Primary vo l tage: 400 kV

TOL (Tap-on-Load) Position (*)

LV (kV) Operation in parallel with existing 250 MVA and 150 MVA autotransformers

15 14

180,3 178,3

Positions not allowing parallel operation

13 12 11 10 9 8 7 6 5 4 3 2 1

176,3 174,3 172,3 170,3 168,2 166,1 164,0 161,8 159,5 157,3 154,9 152,6 150,2

Positions allowing parallel operation

0 147.7 Positions not allowing parallel operation

*) 16 positions of the on load tap changer’s tap from 0 to 15 shall be indicated in position indicators 250 MVA - 380kV/158kV + 7 x ~ 1.25 %; - 8 x ~ 1.25

% AUTOTRANSFORMERS

Primary vol tage: 380 kV

TOL (Tap-on-Load) Position LV (kV)

1 2 3 4 5 6 7 8 9 10 11 12 13

142,2 144,6 146,9 149,2 151,5 153,7 155,9 158,0 160,1 162,1 164,1 166,1 168,1

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14 15 16

170,0 171,9 173,8

TEİAŞ



ANNEX –2 AUTOTRANSFORMER (400/164 kV, 400-450 MVA)

LIST OF GUARANTEED CHARACTERICTICS(SPECIFICATIONS)

DESCRIPTION UNIT REQUIRED GUARANTEED

1. Name of the manufacturer and the place of manufacturing

2. Type mark of the manufacturer 3. Operational conditions (to be

specified by the purchaser)

Altitude (m) Ambient temperature Daily maximum (C)

Daily minimum (C) Average of 24 hours (C) Annual average (C) Maximum wind speed (kg/m2) Maximum solar radiation (W/m2) Ice Load Exposure to industrial pollution Maximum relative humidity (%)

(average of 24 hours)

Possibility of lightning strike

Earthquake Horizontal acceleration Vertical acceleration 4. Applicable standards Specified in TS 5. Transformer type Autotransformer 6. Number of phases 3 7. Number of windings (Each) 2 8. Connection group YNa0

RATED VALUES 9. Rated frequency

(*) It will be provided in article 2.1 of T.S.

(Hz) 50

10. Rated power While 1 (one) heat exchanger is

not operational at 45°C ambient temperature

400

While 1 (one) heat exchanger is operational at 35°C ambient temperature

450

11. Cooling type OFAF or ODAF 12. Temperature rises

(for 400MVA) While 1 (one) heat exchanger is

not operational at 45°C ambient temperature

Top oil (C) 55 Windings (C) 60

TEİAŞ



Core surface (C) 75 Hot spot point of winding (C) 70

TEİAŞ



ANNEX –2 OTOTRANSFORMER (400/164 kV, 400-450 MVA) GUARANTEED

CHARACTERISTICS (SPECIFICATIONS)

DESCRIPTION UNIT REQUIRED GUARANTEED 13. Temperature Rises

(For 450 MV) While all heat exchangers are operational at 35°C ambient temperature

Top oil (C) 65 Windings (C) 70 Core surface (C) 85 Hot spot point of winding (C) 80

14. Temporary overloading (According to IEC 60076-7)

Constant overloading capacity above 400 MVA while all heat exchangers are operational with temperature rise limits specified in article 12.

1,3 times higher than rated

power

15. Rated voltages HV winding (kV) 400 LV winding (kV) 164

16. Highest system voltages HV (kV) 420 LV (kV) 170

17. The winding with taps at neutral side on common winding

Tap changing method On load 18. Voltage setting range

(Tapping range)

No load tapping ratios and taps 400kV/164kV + 8x -1.33 % - 7x -1.33%

Tap position number sequencing

From 8 to 15 + 8x - 1.33 % From 6 to 0

– 7x - 1.33 % From 6 to 0– 7x - 1

Total number of tap positions 16

19. Special condition for operation in parallel with existing 150MVA and 250 MVA autotransformers

Specified in Annex-1

20. Tap changer voltage at no loads Position no: 15 (kV) 180.3

Position no: 13 (kV) 176.3

Position no: 7 (kV) 164.0

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Position no: 1 (kV) 150.2 Position no: 0 (kV) 147.7

21. Category of voltage setting VFVV

DESCRIPTION UNIT REQUIRED GUARANTEED Method of voltage setting Reversing switch

connection

22. Tap powers Equal to rated power in the voltage variation range (at all taps)

23. Maximum tap current ant related tap

(A)

24. Impedance voltage %, 50 Hz, 75C (based on 400 MVA)

15th tap (400kV/164kV+8x — 1.33%)

≤13.5% (tolerance.:

+5%; -10%)

13th tap (400kV/164kV+6x — 1.33%)

7th tap 400kV/164kV) 13% (tol. ±5%)

1st tap (400kV/164kV-6x — 1.33%)

0 tap: (400kV/164kV-7x — 1.33%)

≥12.4% (tolerance.:-5%;

+10%)

25. % resistance voltage (based on (400/164 kV, 400 MVA,75°C)

26. No load current (based on 400 MVA, 50 Hz)

%

a) At main tap 90 % of Nominal HV

voltage

100 % of Nominal HV voltage

0,10 %



0,20 %


0,35 %

b) At the tap of 400kV/164kV-7x — 1.33


0,15 %


0,25 %

27. Constant operation above nominal voltage

(kV) 420

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28. Zero component impedance at main tap, (at 400/164 kV tap) (based on 400 MVA)

%

29. Zero component reactance magnetized between HV &neutral , at 400KV/164 kV tap (400 MVA base )

%

DESCRIPTION UNIT REQUIRED GUARANTEED 30. Maximum operation time of

the autotransformer without exceeding temperature limits/range) guaranteed at 110% of nominal voltage at no load (after operating at full load for a long time at ambient temperature of 35C)

1 hour

31. Noise level (With OFAF or ODAF cooling) 450 MVA base )

(dB) 75

At rated voltage transformation rate of 400/164 kV

At 105 % of rated voltage (420 kV) and at transformation ratio of 400kV/164kV)

(dB) 80

At 105 % of rated voltage (420 kV) and at transformation ratio of 400kV/164kV-7x - 1.33%)

(dB) 85

32. Autotransformer: Is it able to withstand any short circuit in case there is an infinite power at HV and 10000 MVA supply power at LV side at any of HV or LV terminals and any tap position? Short circuits shall be taken as ground contacted with 3 phases and grounding faults with 2 phases and 1 phase. Different failures present synchronously at different windings will not be taken into account. The same type of failure will be paid attention. Thermal resistance period is 3 seconds. Can the number of short circuit be tolerated without occurrence of any failure like the one cited above?

Yes

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33. Name and place of the laboratory where short circuit test is performed/is to be performed?

34. Insulation of the windings and neutral grounding method

Graded insulation (neutral will be grounded directly)

INSULATION LEVELS 35. Full wave and chopped wave

lightning pulse(1.2/50psn) (kVpeak)

HV full/chopped wave) 1425/1570

LV full/chopped wave) 650/715

Neutral full wave 325

DESCRIPTION UNIT REQUIRED GUARANTEED 36. Switching imulse voltage

HV kVpeak) 1050 37. Separate supply power

frequency, voltage test (kVrms) 140

38. Induced voltage test (kVrms) HV terminals 630 LV terminals 275

39. Partial discharge (Um= 420 kV) (visible maximum discharge (q)) Inter-phases

Voltage period 1.2 Um ,15 minutes (pC) < 100 pC 1.5 Um, 60 minutes (pC) < 150 pC 1.2 Um, 15 minutes (pC) < 100 pC

40. Is the autotransformer practically independent from 420KV corona?

Yes

LOSSES

41. No load losses (kW)

At rated voltage and 400/164 kV transformation ratio

90

At 105% of rated voltage and 400/164 kV transformation ratio

105

At rated voltage and 400kV/164kV-7x - 1.33%) transformation ratio

115

At rated voltage and 400kV/164kV+8x- 1.33%) transformation ratio

75

42. On load losses (kW) (at 75°C ) (kW)

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At 400kV/164kV+8x-1.33% transformation ratio (L2)

At 400kV/164kV voltage tap (L1)

650

At 400kV/164kV-7x - 1.33% transformation ratio (L3)

Guaranteed total loss of load L=(2 L1+L2+L3)/4

(refer to type technical specification)

680

43. Cooling system -Type OFAF or ODAF

with heat exchangers mounted on the tank

Total number of heat exchangers (including spares)

Components of each heat exchanger

DESCRIPTION UNIT REQUIRED GUARANTEED Number of fans Number of oil pumps Number of spare heat

exchangers 1

Total motor losses (except for spare heat exchanger)

(kW)

Oil pumps Fans Total 42 SPECIFICATIONS OF THE

WINDINGS

44. Winding materials Specified in TS.

45. Winding average current density (400MVA base , 400/164kV)

(A/mm2)

Serial windings Common windings Setting windings

46. Maximum current density at any tap position with 400MVA rated HV

(A/mm2)

Serial windings ≤2,8

Common windings ≤2,8

Setting windings ≤2,8

47. Cross sections of winding conductors

Serial windings (mm2) Common windings (mm2)

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Setting windings (mm2)

48. Total weight of winding conductors

(Ton)

49. Insulation of the windings Specified in TS.

50. Height of serial winding (mm) CHARACTERISTICS OF

MAGNETIC CIRCUIT

51. Type Core type 52. Number of legs (number) 3 53. Commercial trademark and

manufacturer of the material

54. Flux density of the leg (at no load, main tap and nominal voltage (400 kV)

(Tesla) 1,67

55. Maximum flux density at no load (at the hardest position of the tap when autotransformer is powered at 420 KV)

(Tesla) 1,67

56. Weight of the core (Ton) DESCRIPTION UNIT REQUIRED GUARANTEED SPECIFICATIONS OF THE

TANK

57. Tank type Welded with bolt coupled cover

58. Vacuum withstand capacity (mmHg) 3 59. Capacity to withstand extreme

pressures

Stable pressure at the base 1.5 ATM -24 hours

Dynamic pressure The value resulting from the most intense short circuit

60. Reference frequencies of the tank(boiler)

50 Hz or far from 100 Hz

61. Wall(edge) thickness (mm) 62. Thickness of paint layer (micron) 150 63. Finishing paint color RAL 7033 or

RAL 7039

SPECIFICATIONS OF BUSHING

64. Name and production place of the manufacturer

65. Bushing types HV Condenser

type, oiled

LV Condenser

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type, oiled Neutral Condenser

type, oiled

Insulators Porcelain, brown

66. Rated voltages HV (kV

rms) 420

LV (kV rms)

170

Neutral (kV rms)

72.5

67. Rated (nominal) current HV (A) 800 LV (A) 2000

Neutral (A) 68. Dry, power frequency withstand

voltage

HV (kV rms)

695

LV (kV rms)

355

Neutral (kV rms)

155

DESCRIPTION UNIT REQUIRED GUARANTEED 69. Full wave lightning pulse

HV (kV peak)

1425

LV kV peak) 750 Neutral (kV

peak) 325

70. Switching impulse voltage (kV peak)

HV (kV peak)

1050

71. Minimum creepage (leak path) distance

HV (mm) 13000 LV (mm) 5270

Neutral (mm) 1813 72. Minimum space between live

ends (from phase to phase)

HV (mm) 3840 LV (mm) 1600

73. Minimum spaces (distances) from phase to neutral

HV (mm) 3200 LV (mm) 1330 CHARACTERISTICS OF

BUSHINGS TYPE CURRENT

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TRANSFORMERS 74. For HV bushings (for each

phase)(*) 3 cores (for

protection) 800/5-5-5 A 60VA-10P20 1 core (for metering) 800/1A 5VA-class 0.5 safety factor 5 70 50VA-10P20

75. For LV bushings (for each phase)(*)

3 cores (for protection) 2000/5-5-5 A 60VA-10P20 1 core (for metering) 2000/5 A, 30VA class 0.5,safety factor 5

DESCRIPTION UNIT REQUIRED GUARANTEED 76. For neutral bushings

(*) Values of the current transformers used in HV and LV bushings may be changed by the purchaser as deemed necessary based on the requirement of the purchaser

1 Core (for protection) 1200/5A 60VA-5P20

WEIGHTS AND DIMENSIONS 77. Net weights

core (Ton) Windings (Ton) Tank and its accessories (Ton) Cooling system (Ton) Oil (Ton)

Total weight (with oil) (Ton) 78. Heaviest part that should be

removed from the tank(reservoir) with core and winding mounted

(Ton)

79. Gross weight of the largest part required for transportation

(Ton) 190

80. Gross weight of the complete unit

(Ton)

81. Dimensions of the unit

Width (m) Length (m) Height (m)

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Height of the reservoir (tank)

82. Required dimensions to transport largest part

Width (mm) 3500 Length (mm) Height (mm) 4500

83. Rail space (span) where wheel will be functional

(mm) 1440 (width) 1440 and 2942 (length)

CHARACTERISTICS OF ON LOAD TAP CHANGER

84. Name of the manufacturer and manufacturing location

85. Type mark of the manufacturer.

86. Type of the on-load tap changer (*)

Oil/vacuum Vacuum (*) unless specified otherwise by

the purchaser it will be vacuumed type on load tap changer

DESCRIPTION UNIT REQUIRED GUARANTEED 87. Of the vacuum tube used: The Manufacturer and

manufacturing location

Type mark of the manufacturer

88. Connection diagram 89. Rated current and respective

rated tap voltage (A-kV)

90. Maximum rated current (A) 1300 91. Short circuit current capacity Thermal (3s) (kAms) Dynamic (peak) (kAPeak) 92. Rated frequency (Hz) 50

93. Tap setting field 94. Rated voltage (kVrms) 123 95. Maximum rated tap voltage (V) 96. Tap position number (Number) 16 97. Transresistance value (Ohm) To be

measured during manufacturing

98. Insulation level (IEC 60214) (With lightning pulse/power frequency)

Against earth kVpeak)/ (kVrms

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Inter-phases (kVpeak/kVrms) kVpeak)/ (kVrms

Between first and last contacts of selector switch

(kVpeak)/ (kVrms)

Between any two successive contacts of selector switch

kVpeak)/ (kVrms

Between the contacts of diverter switch(tap changer switch)at the last open position

kVpeak)/ (kVrms

99. Position of tap selector Main tank 100. Position of the diverter switch

(tap changer) A separate

casing

101. Oil level alarm contact Yes 102. Protective devices for safe

operation Yes

103. Motor Driving Mechanism (specify the characteristics of the mechanism)

Yes

DESCRIPTION UNIT REQUIRED GUARANTEED

104. Number of operation prior to first maintenance

Lubrication (greasing) (times) 200.000 Oil change (for oiled type) (times) 100.000 Changing contacts of diverter

switch (tap changer) (for oiled type)

(Times) 200.000

For vacuumed type, change of interrupter cells of diverter switch(tap changer)

(Times) 600.000

Switching number before first maintenance (for vacuum type)

300.000

Mechanical life (times) 1.200.000

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ANNEX-3 AUTOTRANSFORMER (400/164 kV, 400-450 MVA DEVIATION LIST

Purchase order no: ………….. Position No : ………….. Material Code no of the purchaser : ………….. A. DEVIATIONS FROM TECHNICAL SPECIFICATION (Items indicating deviations and what these deviations are shall be clearly emphasized by the bidder)

_ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. B. DEVIATIONS FROM GUARANTEED CHARACTERISTICS (Items indicating deviations and what these deviations are shall be clearly emphasized by the bidder) _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ …………………………………………………………………………….. _ ……………………………………………………………………………..

AUTOTRANSFORMER (400 kV/164kV, 400 - 450 MVA) TYPE ...

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