specification nts-58 for distribution network cast resin power transformers

Israel Electric Corporation Ltd.

Marketing Division

National Network Unit

Specification NTS-58

For

Distribution Network

Cast Resin Power Transformers

Edition No.: 14

Issued date: March 2017

Page No. 1 of 87

SPECIFICATION NTS-58

FOR

DISTRIBUTION NETWORK

CAST RESIN

POWER TRANSFORMERS


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SPECIFICATION NTS-58

FOR

DISTRIBUTION NETWORK

CAST RESIN POWER TRANSFORMERS

Written by: B. Vainshtein Checked by: Y. Shachak Approved by: O. Hayon E. Sharaby


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Table of Contents:

Clause no. Clause description Page No.

1. Purchaser 4

2. Name of item & project 4

3. Location of item & project 4

4. Scope of work 4

5. Terminal points & terminal connection 4

6. Cyber & information security 5

7. Quality assurance & quality control 5

8. Standards & codes 6

9. Technical documentation 6

10. Data and technical requirements 11

11. Tests & inspections 26

12. Packaging & delivery 28

13. Storage & handling 29

14. Nameplate/marking 29

15. Notes 33

16. Special requirements 33

17. Revisions 34

18. Summary of prices 35

19. Summary of data 38

20. Conformity with proposal documents 45

Appendix "A" Know – How agreement to the Purchaser’s satisfaction 46

Appendix "B" Manufacturer Experience to the Purchaser’s satisfaction 48

Appendix "C" Type and special tests declaration 51

Appendix "D" Declaration regarding the guaranteed losses of the

proposed cast resin transformers

53

Appendix "E" Declarations, that the proposed cast resin transformers do

not emit toxic and poisonous gases in case of fire and do

have self-extinguishing property

55

Appendix "F" Specification TF – 43/a for thermal protection device for

distribution network cast resin power transformers

57

Appendix "G" Technical requirements for phase-earthing ball pin

connection ∅∅∅∅20

67

Appendix "H" Quality requirements

(Specification Q - APP – 02, Rev 4)

72

Appendix "I" Declaration regarding fulfillment of requirements of SI

50541 Israeli Standard

79

Appendix "J" Required schedule for prototype approval of cast resin

power transformers for medium voltage distribution

network

81

Appendix "K" Criteria for final comparison of bidders offers 84

Appendix "L" Dimensions between the high voltage parts 86


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1 PURCHASER

The Israel Electric Corporation Limited (I.E.Co.).

2 NAME OF ITEM & PROJECT

This specification covers following equipment: THREE PHASE CAST RESIN POWER TRANSFORMERS WITH NATURAL (SELF) COOLING FOR MEDIUM VOLTAGE DISTRIBUTION NETWORK

3 LOCATION OF ITEM & PROJECT The transformers shall be installed in indoor transformer stations of the medium voltage distribution network.

4 SCOPE OF WORK

This specification covers requirements for the design, develop, manufacture, preserve, pack, furnish and deliver fully tested (with export packing if applicable) Distribution Network Cast Resin Power Transformers. Transformers shall be complete with accessories, as specified hereinafter

4.1 PROJECT DESCRIPTION

Manufacture, furnish and deliver fully tested Distribution Network Cast Resin Power Transformers.

4.2 SCOPE OF SUPPLY

Rated Power, Sn

(KVA) I.E.Co

catalogue number

Rated Line to Line Voltage Un (KV)

630 635821 12.6

1000 635854 12.6

630 636001 22

1000 636035 22

630 5215842 33

Transformers shall be complete with accessories, as specified hereinafter.

4.3 SCOPE OF SERVICE

N/A

5 TERMINAL POINTS & TERMINAL CONNECTION

N/A


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6 CYBER&INFORMATION SECURITY

N/A

7 QUALITY ASSURANCE & QUALITY CONTROL

7.1 QUALITY ASSURANCE

7.1.1 The Manufacturer shall have a Quality Management System (QMS) certified to ISO 9001 requirements, with the following scope of certification: design and production of cast resin distribution transformers.

7.1.2 In case of a Manufacturer operating under a Know – How agreement, the scope of his certification shall include production of type of equipment as described in this specification. Furthermore the Know – How supplier scope of certification shall include: design, production of type of equipment as described in this specification. The Purchaser reserves the right, to allow only to the Manufacturer, who receives the Know – How, to submit the above mentioned certificate during the prototype approval stage, if not available at the proposal submission stage.

7.1.3 The Manufacturer’s main suppliers shall also have a Quality Management System (QMS) certified to ISO 9001requirements, with scope of certification corresponding to the scope of supply indicated in the Manufacturer’s order and the requirements of this specification.

7.1.4 ISO 9001certification requirements – certificate, demonstrating compliance with the above mentioned requirements, respectively, granted each by a Certification Body (CB) which is a part of or belong to an International Certification Network of CB's, should be submitted to Purchaser with the proposal. The CB should be accredited by an Accreditation Body which is a member of the International Accreditation Forum Multilateral Arrangement (IAF MLA). The certificate should bare the marks of: the CB, the above indicated Certification Network of CB's and of its Accreditation Body.

7.2 QUALITY CONTROL

The quality control measures applied during the production of the transformers shall conform to the requirements specified in Appendix "H". In addition to the requirements of Appendix "H" (Q-APP-02, Rev. 4) the bidder shall submit with his proposal a preliminary Quality Plan and Inspection and test Plan (as defined in clauses 2.2 and 2.3 of Q-APP-02). Representatives of the Israel Electrical Corporation shall be authorized to visit the Manufacturer's plant, witness tests and obtain full details of each phase of the transformer's production.


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8 STANDARDS & CODES

8.1 Unless otherwise stated, the cast resin power transformers for medium voltage distribution network

shall be designed, manufactured and tested in accordance with the requirements of the following standards:

IEC Publication 60076-11 May 2004 Power transformers – Part 11:

Dry-type transformers

SI 50541 April 2013 Dry type Distribution transformers – Energy Efficiency and marking

8.2 Standards referred to in this Specification and in Supplements to this Specification are integral

parts of this specification unless explicitly stated otherwise.

8.3 The equipment, including all appurtenances and accessories, shall be fabricated, inspected, tested and preserved in compliance with the Standards as specified herein, unless otherwise indicated.

8.4 In the event that no reference to Standard is made herein, all components and parts shall be fabricated, inspected, tested and preserved, so as to ensure their fitness for designed use and purpose.

8.5 If this Specification contains requirements which differ from those of the above mentioned Standards except the SI 50541 Israeli Standard, the requirements of this Specification shall take precedence.

9 TECHNICAL DOCUMENTATION

9.1 GENERAL Bidders shall submit their technical offers in the following way: - Contents of the offer shall be given at the beginning of the offer. - Each chapter shall be separated from the others by divider page. - Each proposed item shall be presented in a separate chapter which includes all the technical data (drawings, routine/sample/type test report, summary of data, etc.) - All the mentioned documents shall be in English or Hebrew. - The I.E.Co. reserves the right, at its discretion, to allow a Bidder to complete such proposal and to submit such documents at a later date, as prescribed by I.E.Co


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9.2 TECHNICAL DOCUMENTS AND SAMPLES TO ACCOMPANY THE PROPOSAL

The Bidder shall submit together with his offer the following documents from the manufacturer: 9.2.1 Type and special test reports according to paragraph 11 for identical or similar

(cast resin power transformers with rated medium voltage between 10 kV till 36 kV and rated power between 400 kVA till 1250 kVA) transformers to those proposed in the Bid, including test circuit, instruments used, test sequence and description of method.

9.2.2 Routine tests for identical or similar transformers to those proposed in the Bid, including test circuit, instruments used, test sequence and description of method.

9.2.3 Completed filled-in questionnaire and signed by the Bidder (Manufacturer) (Summary of data) for each proposed transformer type (defined by rated voltage and rated power).

9.2.4 Quality Assurance Manual including Quality Procedures of the factory were transformers are manufactured/assembled and tested.

9.2.5 Know – How agreement to the Purchaser’s satisfaction (in case of Know How transfer). The agreement shall meet the requirements as specified in Appendix "A" hereinafter.

9.2.6 Manufacturer Experience to the Purchaser’s satisfaction as required in Appendix "B" hereinafter.

9.2.7 Filled-in and signed type and special tests declaration – Appendix "C". The Bidder shall guarantee to perform (in case of award), at his own expense, type and special tests as required in paragraph 11 and submit to the Purchaser the reports, in English, of these type and special tests before shipment of the ordered transformers.

9.2.8 Technical catalogue of the proposed cast resin transformers.

9.2.9 General outline drawing with dimensions, materials, coating, weight, etc.

9.2.10 Manufacturer's requirements for prolonged storage (2-3 years) before installation, taking into account the specific conditions under clause 10.1.

9.2.11 Installation instructions.

9.2.12 Maintenance instructions (including frequency, procedure and materials required of cast resin transformers).


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9.2.13 Preliminary inspection and test plan to be performed by the manufacturer.

9.2.14 Valid ISO 9001 certificate of the manufacturing factory of the proposed transformers from an Accredited Recognized Certification Body (CB) that is a part of or belongs to an International Certification Network of CB's.

9.2.15 Signed declaration regarding the guaranteed losses of the proposed cast resin transformers, Appendix “D”.

9.2.16 List of components to be manufactured locally (in Israel) (in case of local production).

9.2.17 List of components to be manufactured out of Israel.

9.2.18 Signed declaration, that the proposed transformers do not emit toxic and poisonous gases in case of fire and do have self-extinguishing property - Appendix “E”.

9.2.19 Required schedule for prototype approval of cast resin power transformers for medium voltage distribution network - Appendix “J”.

9.2.20 Declaration regarding fulfillment of requirements of SI 50541 Israeli Standard-Appendix “I”.

9.2.21 Filled-in dimensions between the high voltage parts – Appendix "L".

9.2.22 Filled-in summary of data of earthing ball pin – Appendix "G".

9.2.23 Spare parts data which shall include the following information: Manufacturer name of spare part, Manufacturer number of spare part, order number of spare part (if any), description of spare part, and reference number in drawing.

9.3 TECHNICAL DOCUMENTS AND SAMPLES AFTER NOTIFICATION OF AWARD

Prototype approval 9.3.1 The successful Bidder (henceforth referred to as "the Contractor") shall manufacture one

transformer prototype of each ordered type (defined by voltage and power) for Purchaser's approval.

9.3.2 The Contractor shall submit to the Purchaser one set of drawings of the prototypes for Purchaser's approval.

9.3.3 The drawings shall show the overall outside dimensions, mounting dimensions, and gross weight for each prototype, as well as details of base, terminals, M.V. support insulator, tap changer, M.V. and L.V. connection schemes, nameplate, warnings plates, temperature sensors, wheels. In addition, data of the windings, transformer core and structure shall be shown in a separate drawing.


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9.3.4 All data and descriptive material in the above drawings shall be in English. All

dimensions shall be stated in the metric system.

9.3.5 In addition to the routine tests which shall be performed in any case on each transformer, the Contractor shall perform the type and special tests on these prototypes. The above tests shall be performed according to this Specification and according to IEC 60076 Standard. The above type and special tests shall be performed only after Purchaser's visual inspection and preliminary approval of the prototypes.

9.3.6 If the transformers offered by the Contractor to the Purchaser are identical to the transformers previously manufactured and supplied to I.E.Co by the Contractor during last five years, and the above type and special tests were already performed on them, copies of the reports of the above type and special tests shall be submitted to I.E.Co. The test reports will suffice and the Contractor will not be required to perform the type and special tests on the prototypes. The exemption for the type and special tests performance will be made by I.E.Co according to I.E.Co consideration. For this purpose, identical transformers are considered to be three phase cast resin power transformers with natural (self) cooling, with the same dimensions, same internal structure and with the same technical data (including guaranteed losses) given in this Specification.

9.3.7 The Contractor shall supply to the Purchaser 3 (three) copies, in English, of the reports of the above routine, type and special tests for Purchaser's approval and for Purchaser's final approval of the prototypes.

9.3.8 The Purchaser is entitled to cancel the order for the supply of transformers if the prototypes are not approved by the Purchaser.

9.3.9 In any case, the Contractor shall not manufacture the rest of the transformers ordered before receiving the Purchaser's final approval of the prototypes.

9.3.10 After Purchaser's final approval of the prototypes, as soon as possible after tests,

but before delivery of the rest of the transformers, the Contractor shall submit to the Purchaser copies of each routine test report.

9.3.11 Any submitted data, reports, drawings or descriptive material not written in

English or Hebrew will not be accepted.


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9.3.12 The Contractor shall supply to the Purchaser, if required, and by a particular order at any time

during a period of 15 years from last Purchaser's order, spare parts (coils, etc..) for the previously ordered transformers, in the quantities that are needed by the Purchaser for repair of damaged transformers of Contractor's manufacture.

The Contractor shall supply (Optional: Only if required in the tender documents) to the Purchaser together with the ordered transformers the spare parts in quantities given in the following table:

Spare

Part

Number

Name of Spare Part Quantity of Spare Parts

(in per cent of ordered quantity

of transformers in the tender)

1. Medium Voltage Coil 1%

2. Low Voltage Coil 1%

3. Medium Voltage Support Insulators 2%

4. Low Voltage Insulators 2%

5. Low Voltage Connection Plate 0.5%

6. Medium Voltage Connection Plate 0.5%

7. Coil Supports 2%

8. Set of Tap Changers Connection Plates 0.5%

9. Medium Voltage Connection Busbar Set 0.5%

10. Transformer Wheels 2%

The spare parts shall be supplied together with spare part list which includes the information stated in paragraph 9.2.23. In the event the Bidder is of the opinion that the Purchaser should buy other recommended spare parts, such spares should be specified in the Technical proposal.

9.3.13 I.E.Co reserves the right to request for any draw order written approval issued by the Standards Institution of Israel that, ordered transformers meets the requirements of the published Israeli Standard regarding energy efficiency and marking.

9.4 SCHEDULE UP TO DELIVERY APPROVAL

Please see APPENDIX "J" - Required schedule for prototype approval of cast resin power transformers for medium voltage distribution network.


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10 DATA AND TECHNICAL REQUIREMENTS

10.1 ENVIROMENTAL CONSIDERATIONS & SERVICE CONDITION

10.1.1 THE SERVICE CONDITIONS shall be according to clause 4 of IEC Standard 60076-1/2011 and clause 4 of IEC Standard 60076-11/2004, with the following additions and modifications: The equipment shall be suitable for indoor installation with natural ventilation, in the following environmental conditions:

• Severe atmospheric and industrial air pollution, coal dust, salt spray;

• Long dry period without any rainfall (during storage);

• High atmospheric humidity as experienced in coastal or desert areas;

• Direct and continuous brilliant solar radiation for long periods (during storage);

• Annual variation in air temperature: -5°C to +55°C

• Annual mean air temperature: +25°C

• Maximum relative humidity: 90%

• Average relative humidity: 70%

• Average ambient temperature measured over a period of 24 hours does not exceed: +35°C

• Maximum difference of ambient temperature from night to day: +25°C

• Long summer periods with sunshine (solar radiation of 1120 W/sqm according to IEC Publication 60721-3-4/95).

• Altitude: up to 1000m

Remark: Some of the Equipment may be installed at altitudes greater than 1000 m above sea level (maximum 2000m) and at altitudes under sea level (minimum – 400m). The Bidder shall specify the required operations to be performed in order to install the Equipment in the above altitudes for proper operation.


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10.1.2 SYSTEM DATA

The equipment will be installed in Israel Electric Corp. (I.E.Co) Medium Voltage Distribution systems (networks) with the following system data:

* (might be occasionally solidly grounded for short periods of time) It is to be noted that all the distribution systems are operated radially.

10.1.3 Rated system voltage....(kV) 12.6 22 33

10.1.4 Highest system voltage..(kV) 13.8 24 36

10.1.5 Frequency......................(Hz) 50 50 50

10.1.6 System of neutral grounding Solidly or

via Resistance

via Petersen coil* or via Grounding

Transformer or solidly

Solidly or

via Petersen coil*

10.1.7 Maximum duration of earth fault..................(sec)

10 7200 7200

10.1.8 Maximum phase to ground voltage in case of earth fault..................(kV r.m.s)

14.7 24

36

10.1.9 Insulation level of equipment: a) Basic Insulation Level -

BIL (1.2/50 µsec) ………………….(kV peak) b) One minute withstand voltage (50Hz).(kV r.m.s)

95

38

125

50

170

70

10.1.10 Maximum short-circuit current of the system ……………..…(kA r.m.s)

16

12.5

8

10.1.11 The maximum three phase symmetrical short-circuit value at substation feeding points of: …… (MVA)

350

500

500


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10.2 RELIABILITY, AVAILABILITY, MAINTAINABILITY

N/A

10.3 FUNCTIONAL REQUIREMENTS

General Requirements for the cast resin power transformers:

10.3.1 The transformers will be installed on I.E.Co 12.6kV, 22kV and 33kV distribution systems in indoor transformers stations.

10.3.2 The transformers shall be of cast resin type, indoor, three-phase, self cooling.

10.3.3 Climatic Class The climatic class of the transformers shall be C2 according to the paragraph 13.1 of the IEC 60076-11 Standard.

10.3.4 Environmental Class The environmental class of the transformers shall be E2 according to the paragraph 13.2 of the IEC 60076-11 Standard.

10.3.5 Fire Behaiviour Class The fire behaiviour class of the transformers shall be F1 according to the paragraph 13.3 of the IEC 60076-11 Standard.

10.3.6 Electromagnetic Field Level I.E.Co reserves the right to perform Electromagnetic Field Level suitability in the indoor transformer stations to the requirements of the Israel Ministry of the Environmental Protection.

10.4 PROPERTIES

Electrical Requirements

10.4.1 The rated power shall be one of the following: 630 or 1000 kVA

10.4.2 The rated line to line primary voltage shall be one of the following: 12.6, 22, or 33 kV.

10.4.3 The rated line to line and line to neutral secondary voltage shall be at no-load 400 and 231 volts accordingly.


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10.4.4 The number of phases shall be 3.

10.4.5 The rated frequency shall be 50 Hertz

10.4.6 The vector group of connections shall be Dyn 11.

10.4.7 The short-circuit impedance at full load shall be: (6 ± 0.6)%

10.4.8 Power Losses Costs and Liquidated Damages

10.4.8.1 The following words or combinations of words shall have the meaning appearing next to them: (a) Guaranteed losses - no load losses and load losses (at reference temperature) for each proposed transformer type (defined by voltage and power), as declared by the Bidder, at the commercial stage of the tender. (b) Actual losses - no load losses and load losses (at reference temperature) measured in each transformer actually supplied to the I.E.Co. (c) The original contract period – the period of the contract, entered into between the I.E.Co and the contractor, not including any extensions thereof and not including the option period. (d) The option period – the period within which the I.E.Co purchases any transformers from the contractor pursuant to and following the exercise of the option, granted to it under the contract. (e) The extension of the original contract period - the period by which the original contract period is extended either pursuant to the I.E.Co’s right under the contract, or pursuant to the parties’s mutual consent, as applicable. (f) The extension of the option period - the period by which the option period is extended either pursuant to the I.E.Co’s right under the contract, or pursuant to the parties’s mutual consent, as applicable. (g) Group of transformers - all the transformers of the same type (defined by voltage and power), actually supplied to the I.E.Co by the contractor. (h) Draw order - any order issued by the I.E.Co for the supply of the transformers pursuant to the contract. (i) Contract - the frame contract or frame order, signed or entered into between the I.E.Co and the contractor, at the conclusion of the tender. (j) Second best Bidder - the Bidder, whose price proposal in the tender is second best to that of the contractor (after weighting all relevant techno-economical factors, including preference for locally manufactured goods), as per the I.E.Co’s applicable guidelines for techno-economical evaluations of bid proposals.

10.4.8.2 Bidders are required to submit their guaranteed no-load and load losses (at reference temperature) for each proposed transformer type (defined by voltage and power) at the commercial stage of the tender.


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10.4.8.3 In comparing Bidder's proposals, the guaranteed losses will be taken into

consideration. The financial value attributable to guaranteed power losses will be evaluated as follows: - US$ 7950 per Kilowatt for no-load losses. - US$ 810 per Kilowatt for load losses.

10.4.8.4 If it turns out that the actual losses exceed the guaranteed losses, the contractor shall pay to the I.E.Co liquidated damages in accordance with the terms and conditions, set forth in the following paragraphs.

10.4.8.5 If the sum of the actual no-load and load losses of any group of transformers (as defined above) supplied in the original contract period, exceeds the sum of the losses guaranteed by the Contractor by more than 5%, the Contractor will pay liquidated damages according to the rates stipulated in paragraph 10.4.8.3 above. The above liquidated damages will be paid by the Contractor as to each transformer where the sum of actual losses exceeds the sum of guaranteed losses by more than 5%. In respect of those transformers where the sum of the actual losses is equal or lower than 1.05 times the sum of guaranteed losses, no liquidated damages will be imposed. The liquidated damages, payable by the Contractor will be calculated according to the following formula (as to for each relevant transformer separately):

C=CO(∆POM-1.05∆POG)+CL(∆PLM-1.05∆PLG) where:

- C, value of liquidated damages (in US$)

- CO, cost of no-load losses (in US$ per Kilowatt). The value of CO shall be taken according to above paragraph 10.4.8.3, only if

(∆POM-1.05∆POG)>0, otherwise CO = 0.

- CL, cost of load losses (in US$ per Kilowatt). The value of CL shall be taken according to

above paragraph 10.4.8.3, only if (∆PLM-1.05∆PLG)>0, otherwise CL = 0.

- ∆POM, actual no-load losses (in Kilowatts)

- ∆POG, guaranteed no-load losses (in Kilowatts)

- ∆PLM, actual load losses (in Kilowatts)

- ∆PLG, guaranteed load losses (in Kilowatts)


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10.4.8.6 At the conclusion of the original contract period, the I.E.Co shall re-evaluate the actual cost to it of each group of the transformers, supplied by the Contractor during said period. In re-evaluating such cost, the I.E.Co shall substitute the guaranteed losses of such group by the actual losses. The result of such re-evaluation shall then be compared to the cost of said group of transformers pursuant to the offer of the second best Bidder, based, among others, on the tender price and guaranteed losses, declared by said Bidder. If it turns out, based on such comparison, that the Contractor would not have won the award for said group of transformers, had he declared the actual losses (rather than the guaranteed losses), then the Contractor shall pay to the I.E.Co additional liquidated damages, equal to the difference, if any, between the total cost to the I.E.Co of the relevant group of transformers under the Contractor ’s offer (calculated on the basis of the actual losses) and the total cost of the same group of transformers under the offer of the second best Bidder, plus ten (10%) percent of the total contract price of such group of transformers, adjusted to the date of the re-evaluation. It is clarified, that the liquidated damages, payable under this paragraph shall be in addition to the liquidated damages, if any, payable under the provision of the previous paragraphs, above.

10.4.8.7 The provision of the previous paragraphs 10.4.8.5 and 10.4.8.6 shall also apply as to each group of transformers, supplied during the option period, the extension of the original contract period and the extension of the option period (as such combination words are defined above), if applicable, subject only to the following modification: anywhere, in the previous paragraph, where the words “original contract period” appear, they shall be substituted by words “option period”, or “the extension of the original contract period”, or “the extension of the option period”, as applicable.

10.4.8.8 If the actual losses of any transformer exceed the guaranteed losses plus tolerances (the tolerances are specified in Standard IEC 60076) or exceed the losses given in Standard SI 50541, the transformer will be rejected and the contractor shall be charged with any applicable liquidated damages for the delay, if any, in the delivery of such transformer. In the event that the quantity of rejected transformers in any given period of six months (beginning on the date of the first supply pursuant to the first draw order and every period of six months thereafter) exceed four (4%) percent of the total number of transformers, supplied during such period, the contractor shall be in a substantial breach of contract, entitling the I.E.Co to pursue any legal remedy, available, under the law, for such a breach.


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10.4.9 Power Losses and No-Load Current The maximum guaranteed values of the no-load losses, load losses and no-load current shall not exceed the values given in the following table:

(*) - The reference temperature for the load-losses shall be the permitted average winding rise as

given in column 2 of Table 2 plus 20 °C of the IEC 60076-11 . See table of clause 10.4.16 herein. The actual losses of the transformer shall not exceed the guaranteed losses plus tolerances (the tolerances are specified in Standard IEC 60076).

10.4.10 Insulation Levels

The requirements concerning insulation are summarized in the following table.

Rated Line to Line Voltage,

Un

(KV)

System Highest Line to Line Voltage, Um

(KV)

Basic Insulation Level BIL

(1.2/50µs) (KV peak)

One Minute Withstand Voltage (r.m.s.) at frequency of 50Hz

(KV)

12.6 13.8 95 38

22 24 125 50

33 36 170 70

0.4 - - 3

10.4.11 Noise Level

The maximum noise level (A-weighted surface sound pressure level) shall not exceed the values given in the following table and measured at a distance of one meter from the transformer. The noise level test shall be performed according to Standard IEC 60076-10.

Rated Primary Line to Line Voltage, Un

(KV)

Rated Power Sn

(KVA)

No-Load Losses

P0

(W)

Load Losses P

L (*)

(W)

No-Load Current I0

(%)

12.6 630 1500 7300 1.8

12.6 1000 2000 9700 1.6

22 630 1600 7600 1.8

22 1000 2300 10000 1.6

33 630 1600 7500 1.6

Rated power, Sn KVA

A-weighted Surface Sound Pressure Level LPA

(dB(A), 1m)

630 52

1000 54


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10.4.12 Dimensions

The maximum dimensions of the transformers shall not exceed the values given in the following table:

Rated Power, Sn

(KVA) I.E.Co

catalogue number

Rated Line to Line Voltage Un (KV)

Height (mm)

Width (mm)

Length (mm)

630 635821 12.6 1770 880 1670

1000 635854 12.6 1960 1085 1680

630 636001 22 1770 880 1670

1000 636035 22 1960 1085 1680

630 5215842 33 2300 1310 1850

10.4.13 Method of Cooling

The cooling method of the transformers shall be: natural air cooling (AN).

10.4.14 Partial Discharge The maximum permitted partial discharge level, in accordance to the conditions described in clause 22 of IEC 60076-11 Standard, shall be10 pico-coulombs. The partial discharge measurement shall be carried out after all other dielectric tests are completed.

10.4.15 Structure and Accessories

10.4.15.1 Medium and Low Voltage Windings The medium and low voltage windings shall be casted in epoxy material (EPOXY-RESIN). The casting of the medium voltage windings shall be done in molds with full vacuum conditions. The windings insulation materials shall be of the following types (or types with higher insulation level): - B or F type according to clause 11 of IEC 60076-11 Standard, table 2 (for Medium Voltage Windings) - F type according to clause 11 of IEC 60076-11 Standard, table 2 (for Low Voltage Windings) Coils (windings) should be able to be easily replaced without need for special tools.


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10.4.16 Temperature Rise The winding temperature rise limits shall be according to clause 11 and shall be corrected according to clause 11.2 , table 2 of IEC 60076-11 Standard and as given in the following table: (*) - Corrected Average winding-temperature rise limits at rated current takes into account ambient temperature in clause 10.1.1 herein.

10.4.17 Tap Changer Every transformer shall be equipped with an off-load tap changer on the medium voltage side permitting adjustment to voltages of:

• -5%, -2.5%, 0%, +2.5%, +5% of the rated voltage for 12.6 kV, 22 kV and 33 kV transformers The tap changer shall be operable manually from outside the transformer when the transformer has no input voltage applied.

10.4.18 Temperature Sensors

Each low voltage winding of the transformer shall be equipped with 2 (two) temperature sensors of PTC type. One PTC temperature sensor shall be for the warning alarm and the other for switching off the transformer via thermal protection device. The above mentioned PTC temperature sensors shall meet the requirements of DIN 44081 and DIN 44082 Standards. Connection of the PTC temperature sensors shall be by means of terminals block. Terminals block type and its location shall be approved by the National Network Unit of I.E.Co.

Type of insulation material of the windings

Insulation system temperature

(C°)

Corrected Average winding-temperature rise limits at rated current (*)

(K)

Reference temperature for the load-losses

( C°)

B 130 65 100

F 155 85 120

H 180 110 145


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10.4.19 Thermal Protection Device (Optional: Only if required in the tender documents) Transformers shall be equipped with the thermal protection device. The thermal protection device shall meet the requirements of the TF-43/a specification (Appendix “F”). The Supplier shall install the above mentioned device on each transformer. The device shall be wired to the terminal block of the temperature sensors.

10.4.20 Grounding Screw A M12 threaded grounding screw shall be welded on the transformer’s base.

10.4.21 Wheels Wheels shall be installed on the transformer’s base. The wheels shall permit easy movement of the transformer in all directions, but shall not prevent firm standing of the transformer. Wheels shall have a full (not hollow) axle.

10.4.22 Connection terminals arrangement All Medium voltage connection terminals shall be located from one side of the transformer and all low voltage connection terminals shall be located from the opposite side of the transformer.

10.4.23 Transformer weight

The maximum transformer weight (including all accessories) shall not exceed 4000 kg.

10.4.24 Medium Voltage Connection Terminals

10.4.24.1 The connection of the medium voltage distribution line to the transformer shall be made through support insulators mounted on the transformer. Copper plates shall be installed on the support insulators. See schematic drawing no. 1. The connection between the copper plates and the medium voltage coil shall be made by means of insulated conductors.

10.4.24.2 The support insulators on the medium voltage side shall be made of cyclo-aliphatic epoxy resin and shall meet the requirements of IEC 60273 Standard for the groups designated as follows: - JO6-125, for 12.6KV transformers - JO6-170, for 22 KV transformers - JO6-250, for 33 KV transformers


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The dimensions of the support medium voltage insulators shall be according to the following table:

Voltage

(kV)

Height

(mm)

Maximum diameter of the insulating part

(mm)

Minimum distance between Bushings Centers

(mm)

Minimum Distance

between Live Parts

(mm)

Minimum creepage distance

(mm)

Minimum distance between live parts

and grounded metal part

(mm)

12.6 210 ± 1 105 400 250 275 170

22 300 ± 1 115 400 250 385 225

33 500± 1 130 500 350 530 330

The support insulators shall be supplied assembled in horizontal position on the upper U profile, which braces the transformer core.

10.4.24.3 The copper plates (see paragraph 10.4.24.1 above) shall be 6 mm thick and tin-coated. The minimum tin coat thickness shall be 12µm. The plates shall be designed to enable a firm installation of the following accessories (shall be supplied and installed by Manufacturer): - M12 spherical head bolt (for the grounding connection) according to drawing no.1 of

the Technical requirements for phase-earthing ball pin connection ∅ 20 (Appendix “G”, I.E.Co catalogue number 503821). The bolt with the insulated conductor shall be installed in one of the holes of the plate. The other end of this insulated conductor shall be connected to the medium voltage windings outlets. - M12 hexagonal head bolt, 8.8 type according to DIN 933 Standard, hexagonal nut 8 type according to DIN 934 Standard and two convex spring washers according to DIN 6796 Standard. The bolt shall be installed in the other hole of the plate for connection of the medium voltage cable with cable lug. The bolts, nuts and washer shall be zinc-coated according to ISO 4022 Standard.

10.4.25 Low Voltage Connection Terminals The low voltage connection terminals shall enable horizontal connection of a number of single - core 150 mm2 copper cables or a number of single - core 240 mm2 aluminium cables by means of suitable cable lugs (according to DIN 46237 Standard) and shall allow connection of cables from both sides of the terminal. The number of cables to be connected to each phase and neutral low voltage terminals shall be as follows:


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The terminal of the low voltage coil may be either horizontal or vertical according to the manufacture standard, but the connection plates of the low voltage cable lugs (see drawing no.2) shall be always in horizontal position. The connection plate of the low voltage cables shall be made from electrolytic copper,

according to DIN EN 13601 Standard, with a tin – coat of thickness not less than 12µm. The distance between the above connection plate of each phase to neutral and to all grounded metallic parts of the transformer shall be not less than 65 mm. Any deviation from the above distance shall be accepted only with a written approval of the National Network Unit. Low voltage phases bus bars and the neutral bus bar shall be close to each other and parallel as possible.

Power (KVA)

Number of single-core cables to be connected to

Phase Neutral

630 4 4

1000 6 6


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Schematic drawing no.1: Medium voltage connections


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Drawing no.2: Low voltage connections plates for all three phases and neutral for 630 kVA and 1000 kVA transformers


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10.5 COMMISSIONING

N/A

10.6 OPERATION & MAINTENANCE

General

10.6.1 The Contractor shall submit Installation instructions for approval.

10.6.2 The Contractor shall submit Maintenance instructions (including frequency, procedure and materials if required).

10.7 SAFETY

The Bidder shall submit Safety instructions for the equipment.

10.8 TRAINING N/A

10.9 CONFIGURATION MANAGEMENT

N/A

10.10 ERGONOMICS, HUMAN ENGINEERING

N/A

10.11 METHODS

N/A

10.12 MAINTENANCE

10.12.1 The recommendations for maintenance of the offered transformers shall be clearly

stated in the offer documents.


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11 TESTS & INSPECTIONS

11.1 General requirements for tests

The tests shall be performed in accordance with the latest published recommendations of the International Standard IEC 60076-11 and the present Specification NTS-58 by and at the expense of the Manufacturer.

11.2 Type and Special Tests

11.2.1 The following type tests and special tests shall be performed on only one transformer prototype of each ordered type (defined by voltage and power): - Lightning impulse test on line terminals. - Temperature rise test - Short-circuit test (Special test). Complete routine tests before and after short-circuit test shall be performed by the same laboratory which performed the short-circuit test. - Noise level test (Special test) - Partial discharge test (paragraph 22.4.1.2 of IEC 60076-11 Standard) The sum of the measured no-load and load losses of the transformer, on which type and special tests will be performed, shall be equal or less than the sum of its guaranteed no-load and load losses.

11.2.2 The following special tests reports shall be submitted for approval: - Environmental test - Climatic test - Fire behaiviour test In case, those special test reports are missing or not approved by National Network unit the Environmental, Climatic and Fire behaiviour tests shall be performed on one transformer per order and shall be deemed for all transformers with the same design criteria as stated in IEC 60076-11 Standard. Also those special tests shall be carried out on the same transformer in the sequence defined in table 5 paragraph 13.4 of IEC 60076-11 Standard. Those tests shall be performed only if the total order is for not less than 50 transformers.

11.2.3 Type and Special Test Reports

11.2.3.1 The type and special test reports shall state according to which standard the tests were performed. The test reports shall specify the conditions of the test and the actual values received during the type tests. It shall state the names and have the signatures of those who performed the type tests, those who approved the type tests reports and those who witness the tests.


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11.2.3.2 The type and special test reports shall contain a detailed drawing of the tested equipment, photos of the equipment before and after the test.

The type and special test reports mentioned in paragraph 11.2 of this Specification shall be submitted to Purchaser.

11.2.4 Type and special tests laboratories:

11.2.4.1 Type and special tests mentioned in paragraph 11.2.1 of this Specification shall be performed in one of the following international laboratories:

• F.G.H (Germany)

• I.P.H (Germany)

• CESI (Italy)

• KEMA (Netherlands)

• VEIKI (Hungary)

• Technalia Reserch & Innovation (Spain) In order to perform the type and special tests mentioned in paragraph 11.2.1 in other laboratories a prior written approval by I.E.Co National Network Unit is required at the technical stage of the Bid. The Bidder shall propose a laboratory for performing the special tests mentioned in paragraph 11.2.2. A prior written approval by I.E.Co National Network Unit is also required at the technical stage of the Bid. The Contractor shall perform those type and special tests in authorized laboratories (ISO/IEC 17025 or EN 45011 approved). I.E.Co reserves the right to approve laboratories (situated in Israel and without ISO/IEC 17025 or EN 45011 certification) to perform those tests, after successful audit by the I.E.Co Electrical R&D Laboratory.

11.2.4.2 The Contractor shall submit to the I.E.Co National Network Unit, forty five (45) days before

performing those type and special tests, the names of the laboratories and the programs of those type and special tests for I.E.Co approval.

11.2.4.3 I.E.Co reserves the right to participate in those type and special tests.

11.3 Routine Tests

11.3.1 A routine test shall be performed by the Contractor for each ordered transformer Duly certified routine tests are obligatory. Such tests shall be performed at the Manufacturer’s laboratory.

11.3.2 Each supplied transformer shall be tested in accordance with IEC 60076-11 Standard.

11.3.3 In addition, the following tests shall be performed on each transformer: - Noise level test. The noise level test shall be performed at 1 (one) meter from the transformer according to Standard IEC 60076-10.


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- Partial discharge test. The partial discharge test shall be performed according to the requirements of paragraph 22.4.1.1 of the IEC 60076-11 Standard.

11.3.4 I.E.Co reserves the right to participate in those routine tests, noise level test and partial discharge test. The Contractor shall notify I.E.Co one month before those tests performance, in order to allow I.E.Co staff to participate in those tests.

11.3.5 Routine Test Report

• The routine test report shall state according to which standard and clause the test was performed.

• The Routine Test Report shall contain the transformer rated data, serial number and the results of the tests, the required values and the values obtained during the test.

• The routine tests reports shall be submitted to Purchaser up to one month before delivery of the first batch of the offered transformers.

• Energy efficiency shall be written in the Routine Test Report.

12 PACKAGING & DELIVERY

The transformer shall be wrapped in black nylon cover in order to protect the transformer from direct sunshine. The black nylon cover shall be suitable for prolonged storage period. The transformer shall be supplied in a wooden case. The wooden case shall protect the transformer from accidental hits of all parts of the transformer and shall allow fork-lifting. When designing the wooden case the weight of the transformer shall be taken into considerations to enable fork lifting. Also, the bottom of the wooden case shall protect the base and the lower active parts (bottom) of the transformer. Each packaging shall be clearly marked in print (large letters) with the following:

• Trade mark.

• Israel Electric Corp. Catalogue Number.

• Contract and/or Order Number.

• Serial Number.

• Weight

• Instructions for unloading with a mobile crane and with a fork-lift truck, checking of the correctly balanced during the transportation.

• Indoor storage.

• Lifting and tying points.

• The transformer shall be marked with "umbrella" sign to indicate that the transformer shall be protected from exposure to rain/humidity.

One copy of the Installation Instructions in Hebrew shall be attached to each case.


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13 STORAGE & HANDLING Manufacturer's shall supply requirements for prolonged storage (2-3 years) before erection, taking into account the specific conditions under clause 10.1.

14 NAMEPLATE/MARKING

14.1 Nameplate

Each transformer shall be fitted with a nameplate in Hebrew which shall contain all items requested by Standard IEC 60076-11, clause 9. In addition to the above requirements, the nameplate shall contain the noise level (A-weighted surface sound pressure level) of the transformer measured in dB(A) at a distance of one meter from the transformer. See drawings no.3 and 3a. The actual no load losses and load losses (at reference temperature) of the transformer shall be marked according to the requirements of the Israeli Standard no. SI 50541. I.E.Co catalogue number and the number of this specification shall also appear in the nameplate. The nameplate itself shall be made of anodized sheet aluminium. The nameplate shall be installed on low voltage connections side. The nameplate shall be approved by I.E.Co.


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Drawing no.3: Nameplate in Hebrew


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Drawing no.3a: Nameplate in Hebrew with translation into English


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14.2 Tap Changer Connection Plate

The transformer shall be fitted with a tap changer connections plate. The plate itself and its location shall be approved by the I.E.Co.

14.3 Temperature Sensors Connection Plate

The transformer shall be fitted with a temperature sensors connections plate which shall show the connections of the temperature sensors and shall show the rated temperature of the sensors. The plate itself and its location shall be approved by the I.E.Co.

14.4 Marking

14.4.1 The phase to be connected to each bushing shall be marked next to it in the

following manner: A;B;C on the medium-voltage side a;b;c;n on the low-voltage side

next to the grounding screw The above marking shall be stamped on tin plates which shall be fastened with glue.

14.4.2 The Serial number, power (in KVA) and voltage (in KV) of the transformer shall be marked in white letters on the transformer. The format of the markings shall be: first line: AA/YY/XXXXXX/XXXX, where AA - Manufacturer code (will be given by the Purchaser after notification of the award), two (2) letters, YY - year of manufacture, two (2) digits, XXXXXX - series, six (6) digits, XXXX - serial number of the transformer, four (4) digits, second line: PPPP/VVV, where PPPP - rated power of the transformer in KVA, up to four (4) digits, VVV - rated line to line primary voltage of the transformer in KV, up to three (3) digits for example: AA/11/012345/0001 1000/22

The location of the marking shall be approved by I.E.Co during prototype approval.


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15 NOTES

N/A

16 SPECIAL REQUIREMENTS

16.1 Repair The Bidder shall submit to I.E.Co at the technical stage of the Tender together with the proposal documents, all required data for the coils repair in I.E.Co workshops in case of minor tracks on the coils due to partial discharges. This data shall include all the required materials and instructions for such repair work.

16.2 Technical Services in Case of Faulty Equipment During the Warranty Period (Without Extra Costs to I.E.Co) 16.2.1 The Supplier shall provide services for faulty equipment during the warranty

period. The services shall be given by one of the following ways:

16.2.1.1 In case the Manufacturer's plant is located in Israel the manufacturer representatives shall check the equipment together with I.E.Co representatives within 24 hours after receiving written notification of malfunction of the equipment. The equipment shall be repaired or replaced by new one within one month after checking of the equipment.

16.2.1.2 In case the Manufacturer's plant is not located in Israel those services may be given via a Service Company in Israel (Local Service Company for medium voltage equipment maintenance). The Service Company shall check the equipment together with I.E.Co representatives within 24 hours after receiving written notification of malfunction of the equipment. The equipment shall be repaired or replaced by new one within one month after checking of the equipment.

16.2.1.3 In case the Manufacturer's plant is not located in Israel and the Supplier chose not to have Local Service Company for medium voltage equipment maintenance in Israel, then the manufacturer representative shall come to Israel within 72 hours after receiving written notification and shall check the equipment with I.E.Co representatives within 24 hours after arriving to Israel. The equipment shall be repaired or replaced by new one within one month after checking of the equipment.


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16.2.2 In case the equipment will not be repaired or replaced within time period as stated above, the contractor shall pay to the I.E.Co liquidated damages of 2500$ for delay of each week up to the total cost of each faulty equipment.

16.2.3 The Service Company in Israel shall have a written authorization from transformer's manufacturer or from "know-how" provider for providing services for faulty transformers to I.E.Co during warranty period.

16.2.4 The I.E.Co shall have the rights to check the Service agreement in order to assure the following:

16.2.4.1 Transfer of all the technical documents, drawings, technical directives and etc. necessary for the testing, repairing, operating, maintaining and packing of the proposed equipment to the Service company;

16.2.4.2 Transfer all the instruction for testing and repairing of the proposed equipment for defined list of malfunctions to the Service company;

16.2.4.3 Proper skills and experience of the Service company workers.

16.2.4.4 Proper equipment and tools required to perform the technical service.

16.2.5 The Service Company in Israel shall be approved by I.E.Co subject to withstand the requirement described in clause 16.2.4 above during the prototype approval by I.E.Co, see Appendix "J".

16.3 Technical Services and Repairing Faulty Equipment after the Warranty Period 16.3.1 The Supplier shall provide spare parts for equipment after the warranty

period for a period of 15 years from last Purchaser's order. Those spare parts shall be purchased by I.E.Co per request.

17 REVISIONS

N/A


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18 SUMMARY OF PRICES (to be filled separately for each proposed type of transformers)

TRANSFORMER RATING

Name of Bidder: ________ ______________________

Rated Primary Line to Line voltage: ___________ KV Signature of Bidder: ______________________

Rated Power: ___________ KVA Origin of Manufacturer

(Insert prices and data in this column)

Non Israeli Currency

NIS

18.1 PRICES

18.1.1 Firm price for one (1) transformer with the above

mentioned rating, complete with all accessories and appurtenances as specified in Specification NTS-58. The above mentioned firm price shall include the price for the routine, noise level and partial discharge tests performed on the transformer. The price for the type and special tests shall not be included in the above mentioned firm price and shall be given separately in following paragraph 18.1.2.

18.1.2 Prices for the following type and special tests as

specified in clause 11.2 of this specification:

18.1.2.1 Lightning impulse test on line terminals

18.1.2.2 Temperature rise test

18.1.2.3 Short-circuit test (Special test)

18.1.2.4 Noise level test (Special test)

18.1.2.5 Partial discharge test (Special test)

18.1.2.6 Environmental test (Special test)

18.1.2.7 Climatic test (Special test)

18.1.2.8 Fire behaiviour test (Special test)


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TRANSFORMER RATING Name of Bidder: _________________________

Rated Primary Line to Line voltage: kV Rated Power: kVA Origin of Manufacturer:

Signature of Bidder _________________________ _________________________

(Insert prices and data in this column)

Non Israeli Currency

NIS

18.1.3 Prices for following spare parts according to quantities given in paragraph 9.3.12 of this Specification:

18.1.3.1 One (1) Medium Voltage Coil ................................

18.1.3.2 One (1) Low Voltage Coil .................................

18.1.3.3 One(1) Medium Voltage Support Insulator

18.1.3.4 One (1) Low Voltage Insulator

18.1.3.5 One (1) Low Voltage Connection Plate

18.1.3.6 One (1) Medium Voltage Connection Plate

18.1.3.7 One (1) Coil Support

18.1.3.8 One (1) Set of Tap Changers Connection Plates

18.1.3.9 One (1) Medium Voltage Connection Busbar Set

18.1.3.10 One (1) Transformer Wheel

18.1.4 Prices for additional recommended spare parts recommended by Manufacturer:


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18.2. POWER LOSSES AND NO-LOAD CURRENT

18.2.1 No-load current …………………………………….. %

18.2.2 No-load losses ………………………………….... Watts

18.2.3 Load losses (at reference temperature) …………… Watts

18.2.4 Reference temperature ……………………………. C°

____________ ___________ Signature of Bidder Date of Bid

Type of insulation material of the windings

Reference temperature for the load-losses

(C°)

B 100

F 120

H 145


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19 SUMMARY OF DATA

(to be filled separately for each proposed type of transformers)

SUMMARY OF DATA FOR DISTRIBUTION NETWORK


TRANSFORMER RATING

Name of Bidder: ________ ______________________

Rated Primary Line to Line voltage: ___________ KV

Rated Power: ____________ KVA

Signature of Bidder _____________________

(Insert all data in this column)

19.1. DRAWINGS, INSTRUCTIONS AND WEIGHT

19.1.1 Drawings of the transformer (including overall dimensions) ...........................(attached/not attached)

19.1.2 Mounting instructions (including ventilation instructions) …………………………...................(attached/not attached)

19.1.3 Drawing of the nameplate ...........(attached/not attached)

19.1.4 Drawings of tap changer connection plate ...........................................................(attached/not attached)

19.1.5 Drawing of the temperature sensors connections .....................................................(attached/not attached)

19.1.6 Drawing of the temperature sensors connections plate .....................................................(attached/not attached)

19.1.7 Drawing of the low voltage connectors

..................................................................(attached/not attached)

19.1.8 Drawing of the medium voltage connectors

......................................................(attached/not attached)

19.1.9 Weight of the transformer ....................... (kg)

19.1.10 Maintenance instructions .........(attached/not attached)


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TRANSFORMER RATING

Name of Bidder: ________ ______________________





19.2 OVERALL DIMENSIONS (including all accessories

and appurtenances )

19.2.1 Height .................................................................... (mm)

19.2.2 Width ..................................................................... (mm)

19.2.3 Length .................................................................... (mm)

19.3 GENERAL DATA

19.3.1 What is the type number of the proposed transformer?

19.3.2 Rated primary line to line voltage ........................ (kV)

19.3.4 Rated secondary line to line voltage..................... (kV)

19.3.5 Rated frequency .................................................. (Hz)

19.3.6 Number of phases ...............................................

19.3.7 Identification symbol cooling method (method of cooling)

19.3.8 Group of connection

19.3.9 Rated power ...................................................... (kVA)

19.3.10 Short-circuit impedance at rated current ..............(%)

19.3.11 Rated insulation level at the medium voltage side

19.3.11.1 BIL (1.2/50µsec) ................................. (kV peak)

19.3.11.2 at a frequency of 50 Hz, for one minute …………………………………………….(kV r.m.s.)

19.3.12 Rated insulation level on the low voltage side (at a frequency of 50Hz for one minute).……..... (kV r.m.s.)

19.3.13 Noise level (A-weighted surface sound pressure level [L

pA]) measured at a distance of one meter)

………………………………….........................(dB(A))


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TRANSFORMER RATING

Name of Bidder: ________ ______________________





19.3.14 Partial discharge level …………………………. (pC)

19.3.15 Necessary air supply, required for the proper cooling of the transformer……………….........(m3/sec)

19.3.16 Will the proposed transformer emit poisoned, toxic gases in case of fire in the building where transformer is installed?...........................................................(Yes/No)

19.3.17 Has the proposed transformer self-extinguishing property? ........................................................ (Yes/No)

19.3.18 What is the Climatic class of the proposed transformers?

19.3.19 What is the Environmental class of the proposed transformers?

19.3.20 What is the Fire Behaiviour class of the proposed transformers?

19.3.21 Is the customers list with quantities of similar transformers attached? ................................... (Yes/No)

19.4 STRUCTURE AND ACCESSORIES

19.4.1 Ratings of the tap changer .........................................(%)

Tap changer type and manufacturer ........................

19.4.2 Windings shape and material (eg. foil, round, square, Al, Cu, etc)

Medium voltage

Low voltage

19.4.2.1 Material of the windings................................

19.4.2.2 Shape of the windings...................................

19.4.2.3 Are the windings cast under full vacuum? …………………………………….... (Yes/No)

19.4.2.4 Type of windings material (foil, wire) ............


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TRANSFORMER RATING

Name of Bidder: ________ ______________________





19.4.2.5 Are the windings reinforced by means of fiberglass ? ………………………….................... (Yes/No)

Medium voltage

Low voltage

19.4.2.6 Insulation material (please note the insulation Class)

19.4.2.7 Average windings temperature rise limits at rated current ……………………............. (K)

19.4.2.8 Manufacturer name of the windings

19.4.2.9 May the internal short-circuit in the windings cause fire of the transformer? .......... (Yes/No)

19.4.3 Are the 3 (three) medium voltage windings of the transformer identical in order to allow interchangeability?...........................................(Yes/No)

19.4.4 Temperature sensors (Please attach drawings, connection scheme, catalogue)

19.4.4.1 Are the temperature sensors of PTC type? …………………………………….. (Yes/No)

19.4.4.2 Do the temperature sensors comply with the requirements of DIN 44081, DIN 44082 Standards ? …………………….... (Yes/No)

19.4.4.3 Number of temperature sensors?

19.4.4.4 Where are temperature sensors installed?

19.4.4.5 What is the temperature for a warning alarm?

…………………................................... (°C)

19.4.4.6 What is the temperature for tripping? ... (°C)


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TRANSFORMER RATING

Name of Bidder: ________ ______________________





19.4.5 Medium voltage support insulators

19.4.5.1 Number of medium voltage insulators ...................

19.4.5.2 Rated voltage of the medium voltage insulators…………………………………(kV)

19.4.5.3 Insulator’s height ..................................... (mm)

19.4.5.4 Insulator's creepage distance ..……….... (mm)

19.4.5.5 From which material are the insulators made?

19.4.5.6 Name of the medium voltage insulator manufacturer ……..……....................................

19.4.5.7 Type number of insulators .................................

19.4.5.8 Do the insulators comply with the requirements of the IEC 60273 Standard (JO6): group JO6-125 ?................................. (Yes/No) group JO6-170 ?................................. (Yes/No)

group JO6-250 ?................................. (Yes/No)

19.4.5.9 Is the medium voltage insulators catalogue attached? ...................................... (Yes/No)

19.4.5.10 What is the distance between the centers of the insulators ....................................... (mm)

19.4.5.11 What is the minimal distance between connection copper plates .................. (mm)

19.4.5.12 What is the minimal distance between live and earthed metal parts ……………....... (mm)


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TRANSFORMER RATING

Name of Bidder: ________ ______________________





19.5 ROUTINE TESTS

19.5.1 Are the routine tests carried out according to the IEC 60076-11 Publications ? ..................... (Yes/No)

19.6. TYPE TESTS AND SPECIAL TESTS

19.6.1 Tests of temperature rise

19.6.1.1 Are the temperature rise tests carried out according to the latest IEC 60076-11 and IEC 60076-2 Publications? ……………………………. (Yes/No)

19.6.1.2 Is the temperature rise test report included in the Bidder's proposal ? .................................. (Yes/No)

19.6.2 Tests of the insulation levels and dielectric tests.

19.6.2.1 Are the insulation levels and dielectric tests carried out according to the latest IEC 60076-11 and IEC 60076-3 Publications? ............................. (Yes/No)

19.6.2.2 Are the insulation level and dielectric test reports included in the Bidder's proposal ? .......... (Yes/No)

19.6.3 Ability to withstand short-circuit tests

19.6.3.1 Is the short-circuit withstand test carried out according to latest IEC 60076-5 and IEC 60076- 11 Publications? ………………………….. (Yes/No)

19.6.3.2 Is the ability to withstand short-circuit tests report included in the Bidder's proposal ? ...........(Yes/No)

19.6.4 Noise level test (A-weighted surface sound pressure level)

19.6.4.1 Is the Noise level test carried out according to latest IEC 60076-10 and IEC 60076-11 Publications? ................................................................. (Yes/No)


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TRANSFORMER RATING

Name of Bidder: ________ ______________________





19.6.4.2 Is the noise level test report included in the Bidder's proposal ? ................................................ (Yes/No)

19.6.5 Partial discharge tests.

19.6.5.1 Is the Partial discharge test (type test) carried out according to the latest IEC 60076-11 Publication? .................................................................. (Yes/No)

19.6.5.2 Is the Partial discharge test report included in the Bidder's proposal ? .................................. (Yes/No)

19.6.6 Environmental test.

19.6.6.1 Is the Environmental test carried out according to the latest IEC 60076-11 Publication? .................................................................. (Yes/No)

19.6.6.2 Is the Environmental test report included in the Bidder's proposal ? .................................. (Yes/No)

19.6.7 Climatic test

19.6.7.1 Is the Climatic test carried out according to the latest IEC 60076-11 Publication?........... (Yes/No)

19.6.7.2 Is the Climatic test report included in the Bidder's proposal ? ................................................. (Yes/No)

19.6.8 Fire behaiviour test

19.6.8.1 Is the Fire behaiviour test carried out according to the latest IEC 60076-11 Publication?...... (Yes/No)

19.6.8.2 Is the Fire behavior test report included in the Bidder's proposal ? .................................. (Yes/No)

19.7 Did you fill-in the data C, D required in drawing no.4

"Annexure L"…………………………….. (Yes/No)


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20 - CONFORMITY WITH PROPOSAL DOCUMENTS Supplier hereby certifies that he agrees to all provisions of the Proposal Documents unless exceptions are specifically and clearly listed in the proposal and identified as exceptions. Supplier's printed terms and conditions are not considered specific exceptions. Any exceptions which Supplier has taken are listed on Page . Supplier hereby certifies that he agrees to all conditions of the Cover Letter of The Israel Electric Corporation Limited which accompanied the Proposal Documents.

Signature of Supplier Date of Proposal


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APPENDIX "A"

Know – How agreement to the Purchaser’s satisfaction


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Know – How Agreement Where a "know-how" agreement is required under the tender/inquiry documents, or under the specifications, such "know-how" agreement must include the following commitments, or substantially similar commitments, on part of the provider of the know-how: 1. To transfer to the know-how recipient, all the technical documents and drawings, necessary for

the manufacturing, fabrication, testing, proper packing, operating and maintaining of the proposed equipment;

2. To adequately instruct and provide technical support to the know how recipient in the field of manufacture/fabrication, design, quality control, testing and repair of the proposed equipment;

3. To conduct an inspection of the manufacturing line of the know-how recipient and to approve its adequacy to manufacture the proposed equipment up to the standards of the know-how provider;

4. To participate in type tests of the proposed equipment (of the know how recipient's manufacture) and to instruct/support the know-how recipient in undertaking corrective act/procedure, if required or approved by the I.E.Co;

5. To provide technical support/instructions to the know-how recipient during the first two years following the start of manufacturing by the know-how recipient.

The I.E.Co waives any and all claims it may have against the know-how provider, for any conduct, act or omission, on part of the know-how provider, or any of its employees, agents, or representatives, directly or indirectly related to the transfer of know-how, the know-how agreement, or any action, or omission thereunder. This waiver of claims shall insure to the benefit of the know-how provider and to the benefit of any of its employees, agents or representatives. Nothing said herein shall release the know-how recipient from any duties or commitments, undertaken by it, as part of its proposal to the I.E.Co, or in connection with any failures or omissions to carry out such duties, or commitments.


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APPENDIX "B"

Manufacturer Experience to the Purchaser’s satisfaction


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Manufacturer Experience

1. The Manufacturer shall have at least 5 (five) years accumulated experience in manufacturing of cast resin power transformers with rated medium voltage between 10 kV till 36 kV and rated power between 400 kVA till 1250 kVA in the 10 last years.

2. In case the Manufacturer does not have at least 5 (five) years accumulated experience in manufacturing of above mentioned equipment the Manufacturer shall have a Know-How agreement with a company which has at least 5 (five) years accumulated experience in manufacturing the above mentioned equipment during last 10 years, and both companies shall have a Quality Management System (QMS) which meets the requirements of ISO Standard 9001:2000.

3. The experience shall reflect at least 250 distribution network cast resin transformers supplied by Manufacturer or by Know How Supplier.

4. The experience described in paragraph 1 or 2, as applicable, shall be proven by a statement of manufacturing experience (see below) which shall be submitted by the Manufacturer together with his offer to the Purchaser.


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STATEMENT OF MANUFACTURING EXPERIENCE

I, ________________ (enter name), hereby state the following:

1. I_________(enter name) , am authorized to sign this statement on behalf of_________

("the Manufacturer")

2. I hold the position of ____________________ ____________________________ (enter job title and

description, i.e. partner, production manager, sales manager, etc.) at the Manufacturer.

3. I have been in this position since __________ (enter date).

4. I am providing this statement with regards to I.E.Co's tender number ____________ ("the Tender").

5. The facts/details given in this statement have been checked and verified by me.

6. _________________ (the Manufacturer) has experience in production cast resin power transformers with

rated medium voltage between 10 kV till 36 kV and rated power between 400 kVA till 1250 kVA, for at

least 5 years in the last 10 years, prior to tender submission. The experience shall reflect at least 250

distribution network cast resin transformers supplied by Manufacturer.

7. I hereby undertake to provide, upon IECo's request and at its sole discretion, any other documents (reference

list, quantity ,dates of supply, letter of recommendations etc. ) or other Information requested for this Tender

for purposes of proving said experience.

_______________

Signature

_______________

Date


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APPENDIX "C"

Type and special tests declaration


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Declaration To be returned signed and stamped by Supplier

We hereby declare, that in case of award we will perform at our own expense and responsibility, type and special tests (on every type and alternative, that will be notified of award) as required in paragraph 11 of Specification NTS-58 and submit to the Purchaser the reports, in English, of these type and special tests as required in Appendix "J" of this specification.

Name of Supplier: Signature and stamp of Supplier: Date:


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APPENDIX "D"

Declaration regarding the guaranteed losses of the proposed cast resin transformers


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We hereby declare, that in case of award the No-load and Load losses of the proposed transformers will not exceed the values given in paragraph 10.4.9 of Specification NTS-58. Name of Supplier: Signature and stamp of Supplier: Date:


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APPENDIX "E"

Declarations, that the proposed cast resin transformers do not emit toxic and poisonous gases in case of fire and do have

self-extinguishing property


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We hereby declare, that the proposed transformers do not emit toxic and poisonous gases in case of fire and do have self-extinguishing property. Name of Supplier: Signature and stamp of Supplier: Date:


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APPENDIX "F"

SPECIFICATION TF – 43/a ֹ

FOR THERMAL PROTECTION DEVICE FOR DISTRIBUTION NETWORK


THE ISRAEL ELECTRIC CORPORATION LTD NETWORK HEAD OFFICE

SPECIFICATION TF – 43/aֹ

FOR THERMAL PROTECTION DEVICE FOR DISTRIBUTION NETWORK��

CAST RESIN POWER TRANSFORMERS ֹ

January 1998

THE ISRAEL ELECTRIC CORPORATION LTD NETWORK HEAD OFFICE

SPECIFICATION TF – 43/a

FOR THERMAL PROTECTION DEVICE FOR DISTRIBUTION NETWORK


Written by: L. Weisz

Checked by: Y. Shachak

Approved by: C. Kamil

January 1998

Page - 2

SPECIFICATION FOR THERMAL PROTECTION DEVICE FOR DISTRIBUTION

NETWORK CAST RESIN POWER TRANSFORMERS

CONTENTS

1. GENERAL. 2. TECHNICAL DATA.

3. ATTACHMENT: SUMMARY OF DATA FOR THERMAL PROTECTION DEVICE FOR

DISTRIBUTION NETWORK CAST RESIN POWER TRANSFORMERS

Page – 3

1. GENERAL

1.1 Scope of work

Manufacture, furnish and deliver fully tested thermal protection devices for distribution network cast resin power transformers.

1.2 Preconditions

The Bidder shall submit to the Israel Electric Corporation (I.E.Co.), together with his offer: - One sample of the proposed thermal protection device.

- Two (2) sets of filled-in questionnaire for each proposed type of the thermal protection device

(Attachment).

1.3 Acceptance conditions

1.3.1 The Bidder shall submit to the Israel Electric Corporation (I.E.Co.), together with his offer: - two (2) sets of electrical and mechanical drawings of the thermal protection device.

The drawings shall include electrical drawings, wiring diagrams, overall outside dimensions and mounting dimensions.

All data and descriptive material in the above drawings shall be in English. All dimensions shall be stated in the metric system.

1.3.2 The Bidder shall submit to I.E.Co. together with his offer, a parts list of the thermal protection

device, catalogue numbers and reference numbers in drawings.

1.3.3 The Bidder shall submit to I.E.Co. together with his offer customers list with names, quantities and dates.

1.3.4 Before delivery of the units, The Bidder shall submit to the Purchaser in English:

- Two (2) copies of the routine test reports for each unit. - Operation instructions. - Mounting instructions. - Maintenance instructions.

Page - 4

2. TECHNICAL DATA

2.1 Environment conditions

The thermal protection device will be mounted into an indoor transformer station (ITS) on the transformer, or on the wall near the transformer.

The environment conditions outside the indoor transformer station will be as follows:

- Severe atmospheric and industrial air pollution, coal dust, salt spray.

- Long dry period without any rainfall.

- High atmospheric humidity as experienced in coastal or desert areas.

- Direct and continuous brilliant solar radiation for long periods.

- Annual variation in air temperature from -5ºC to +55ºC.

- Mean air temperature +25ºC. - Maximum relative humidity 90% - Average relative humidity 70% - Average ambient temperature measured over a period of 24 hours does not exceed 35ºC.

2.2 Operating Conditions

2.2.1 The thermal protection device will be wired to terminal block of the transformer which includes four terminals, two for high temperature warning and two for a very high temperature which requires transformer disconnection. The transformer thermal temperature sensors are of a PTC type, according to DIN 44081 and DIN 44082 and are as follows: three serially connected PTC-thermistors (one for each low voltage coil of transformer) for thermal warning and three serially connected PTC thermistors (one for each low voltage coil of transformer for transformer disconnection due to very high temperature. The PTC connection is not a part of this specification.

2.2.2 The device shall be installed inside a polyester cubicle.

IP required for the cubicle: not less than IP 659.

2.2.3 The supply voltage will be 230 VAC. Any disconnection of the 230 VAC supply or fuse blowing will not cause an alarm output, or a trip output.

Page – 5

2.2.4 The device outputs will be potential free contacts type with two change over contacts, of a minimum 230 VAC, 10A and 24 VDC, 1A switching capability. The trip output shall be delayed. The delay time shall be adjustable up to one hour.

2.2.5 The thermal protection device shall include terminals for connecting the supply voltage, the PTC

inputs and the potential free contacts.

2.2.6 The device will be protected with an miniature circuit breaker on the 230 VAC supply voltage.

2.2.7 The device shall have accessories for mounting the device on the wall of ITS and on the cast resin transformer.

2.2.8 The cubicle shall have three (3) cable entries - (glands) for connecting the following cables:

-NYY 3 X 2.52 mm for the 230VAC supply voltage. -NYY 4 X 1.52 mm for PTC connections. -NYY 4 X 1.52 mm for potential free contacts for alarm and trip.

2.2.9 If the Bidder supplies to I.E.Co. the cast resin power transformers together with the thermal

protection, the PTC shall be wired and connected to the thermal protection device by the Bidder.

2.2.10 Schematic diagram of thermal protection device - see drawing No. 1.

2.3 Marking

The thermal protection device marking shall be as follows:

- On the top side : CAST RESIN TRANSFORMER PROTECTION DEVICE

- Inputs from transformer: T1,T2 (high temperature)

T3,T4 (very high temperature)

- Outputs : 1,2,3,4,5,6

- 230 VAC: ∼∼∼∼, 0

2.4 Packing

In the shipment packages of thermal protection devices, each thermal protection device shall be packed separately, protected against rain and accidental hits during transportation and storage.

Page - 6

Page - 7

Attachment Specification TF-43/a

Questionnaire

(to be filled in separately for each type of

proposed thermal protection devices)

Bidder shall sign at the bottom of this Attachment

Bidder Name

Date of Bid

Signature of Bidder

Page - 8

Attachment Specification TF-43/a

Summary of data for thermal protection devices for distribution network cast resin power transformers

Date of Bid Bidder Signature .

Page - 9

Thermal protection device type: .

³Insert all data in this column

Required Offered

1. Drawings, instructions and part list

1.1 Two (2) sets of electrical drawing and overall dimensions ..…………..(attached/not attached)

attached

1.2 Part list including prices, catalog numbers and reference numbers in drawings …………….…………..(attached/not attached)

attached

1.3 Customer list with names, quantities and dates ………………….(attached/not attached)

attached

1.4 Routine test reports for each unit …………………..…….(attached/not attached)

1.5 Operation instructions ...(attached/not attached)

attached

1.6 Mounting instructions ...(attached/not attached)

attached

1.7 Maintenance instructions

………………………...(attached/not attached)

attached

2. Technical data

2.1 Is the supply voltage: 230 VAC ………(Yes/No) Yes

2.2 Can disconnection of supply voltage cause alarm or trip outputs ? ……………….………(Yes/No)

Yes

2.3 Is the potential free contacts capability 230VAC, 10A and 24 VDC, 1A ? ………….……(Yes/No)

Yes

2.4 Has the thermal protection device a terminal output? ……………………………...…(Yes/No)

Yes

2.5 Is the thermal protection device protected with miniature circuit breaker? ……….….…(Yes/No)

Yes

2.6 Has the thermal protection device required accessories for mounting the device on ITS wall and on the transformer? ……….…....…(Yes/No)

Yes

2.7 Has the thermal device three glands according to paragraph 2.2.8? ……….…………...…(Yes/No)

Yes

2.8 Is the thermal protection device installed in a polyester cubicle with at least IP659?…(Yes/No)

Yes


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APPENDIX "G"

TECHNICAL REQUIREMENTS

FOR

PHASE-EARTHING BALL PIN CONNECTION ∅20


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TECHNICAL REQUIREMENTS FOR EARTHING BALL:

3 Earthing Balls (one on each phase) Ø20mm shall be designed and manufactured according to the requirements of the standard DIN 48088 -1 and tested according to the requirements of the standard IEC 61230. The earthing ball shall withstand thermal and dynamic effects of at least 18.7 kA/1s (26.5 kA/0.5s) short-circuit current according to Standard IEC 61230. The earthing ball shall be made of E-Cu, high-tensile copper alloy, minimum tensile strength 300N/mm2.

The earthing ball shall be electro-tinned with at least 20µ coating according to ISO 4042, system A: j6A The threaded bolt (pin) of the earthing ball shall be made of steel 8.8 class of strength DIN 976-8.8 (DIN 933-8.8). Each earthing ball shall be provided with a nut M12 according to DIN 934-8 and a conical spring washer according to DIN 6796-8-FSt. The fastening nut, conical spring washer and threaded bolt (pin) shall be zinc

electro-plated with at least 8µm coating according to ISO 4042. The hole depth shall permit at least M12 tapping, but shall not reduce the effective conducting cross-section. The stud shall be tightened in the female thread so as to assure withstanding counter opening torque of the nut.

MARKING

Each earthing ball shall be marked with the following marks:

• Manufacturer's name or trade mark

• 18.7 kA/1s

For the nut the property class as required by the mentioned standards must be marked.

For the relevant required dimensions please see attached drawing no. 1


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For the technical evaluation, the Bidder shall submit to the Israel Electric Corp.,

together with his proposal Filled-in Summary of Data for earthing ball pin.

L – shall be small enough in order to meet requirements regarding minimum distance between

live parts and grounded metal part as written in the clause 4.5.12.2 of the NTS-58/7

Specification.

22


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SUMMARY OF DATA EARTHING BALL PIN

Tender No. _______________

Insert all data in this column

1. Bidder's name and address

2. Bidder's tel. and fax no.

3. Manufacturer name and address

4. Manufacturer tel. and fax no.

5. Country of origin

6. Manufacturer cat. No. / Part No.

7. Dimensions according to drawing no.1:

• ball diameter d1

• cylinder diameter d2

• threaded bolt (pin) d3 M12

• threaded bolt extension L

• from center of ball to female thread L1

• overall female length M

• key width SW

• length of thread C

• diameter of the conical spring washer d4

• dimension F

8. Are these marks provided?

• Trade Mark (Yes/No)

• 18.7kA/1s (Yes/No)

9. Are the following documents attached?

• General drawings/catalog (Yes/No)

• Manufacturing description (Yes/No)

• Quality assurance Manual including Quality Procedures

(Yes/No)


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Insert all data in this column

10. 10. Standards

10.1 Does the phase earthing ball connection complies with:

• DIN 48088 part 1 (Yes/No)

• IEC 61230 (Yes/No)

11. 11. Materials

11.1 The earthing ball connection is made of:

11.2 The min. tensile strength is: N/mm2

11.3 What is the thickness of the electro-tinned coating? (µm)

11.4 Is the bolt (pin) comply with DIN 976-8.8 (DIN 933-8.8)

(Yes/No)

11.5 Are the stud, nut and conical spring washer zinc

galvanize? (Yes/No)

11.6 What is the thickness of the plating? (µm)

12. Type test report (Yes/No)

Bidder hereby certifies that he agrees to all the provisions of the Inquiry Documents.

Bidder hereby certifies that he agrees to all conditions of the cover letter of the Israel Electric

Corporation Limited, which accompanied the Proposal documents.

Date of Proposal ________________

Signature of Bidder _______________


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APPENDIX "H"

QUALITY REQUIREMENTS

(SPECIFICATION Q - APP – 02, Rev 4)


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APPENDIX "I"

Declaration regarding fulfillment of

requirements of SI 50541 Israeli Standard


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We hereby declare, that the proposed transformers shall fulfill the requirements of the SI 50541 Israeli Standard (Dry type distribution transformers – Requirements for the Energy efficiency and marking). We hereby declare, that after notification of award, at the prototype approval stage, if we will be the successful Bidder, we shall submit to the National Network Unit of I.E.Co written approval issued by the Standards Institution of Israel that, each awarded prototype meets the requirements of the published Israeli Standard regarding energy efficiency and marking.

Name of Supplier: Signature and stamp of Supplier: Date:


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APPENDIX "J"

Required schedule for prototype approval of cast resin power

transformers for medium voltage distribution network


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Required schedule for prototype approval of cast resin power transformers for medium voltage distribution network (with type tests)

I.E.Co. Inquiry no.

Weeks

STAGE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

1 Starting date (*)

2 Submission of drawings and technical data for the transformer and its accessories to I.E.Co. for approval

3 Drawings approval by I.E.Co. including clarifications.

4 Submission of date, laboratory name and plan for type tests (for I.E.Co approval)

5 Manufacture of the prototypes

6 Visual inspection of the prototypes

7 Routine tests performance

8 Type tests performance and submission of preliminary type tests reports

9 Submission of the final type test reports for approval

10 Type tests report approval

11 Submission of written approval issued by the Standards Institution of Israel regarding energy efficiency and marking

12 Submission agreement with Service company(**)

13 Approval of the Service company

14 Prototypes approval

Bidder name and title: Bidder signature Date:

(*)- the date on which contractual obligation has been created between the parties, as specified in the invitation to submit proposals in the Tender/RFP.

(**)-Regarding clause 16.2.1.2


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Required schedule for prototype approval of cast resin power transformers for medium voltage distribution network (without type tests)

I.E.Co. Inquiry no.

Weeks

STAGE 1 2 3 4 5 6 7 8 9 10 11 12 13 14

1 Starting date (*)

2 Submission of drawings and technical data for the transformer and its accessories to I.E.Co. for approval

3 Drawings approval by I.E.Co. including clarifications.

4 Manufacture of the prototypes

5 Visual inspection of the prototypes

6 Routine tests performance

7 Submission of written approval issued by the Standards Institution of Israel regarding energy efficiency and marking

8 Submission agreement with Service company(**)

9 Approval of the Service company

10 Prototypes approval

Bidder name and title: Bidder signature

Date:

(*)- the date on which contractual obligation has been created between the parties, as specified in the invitation to submit proposals in the Tender/RFP.

(**)-Regarding clause 16.2.1.2


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APPENDIX "K"

CRITERIA FOR FINAL COMPARISON OF BIDDERS OFFERS (which have fulfilled all tender requirements)


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Criteria for final comparison of Bidders offers (which have fulfilled all tender requirements) for Cast Resin Distribution Network Power Transformers

For selection of the offer which provides the maximum benefit to the Purchaser, the following benefits (parameters) will be taken into account in the techno-economical comparison of Bidders offers:

Parameter Weight (in %)

1. Sound Noise level (40) Sound noise level required by this specification - 28; Smallest sound noise level - 40; Other - proportional Sound Noise level shall be proven during type tests.

40

2. Structure (30) 2.1 Low voltage windings casted in molds in full vacuum conditions Yes – 10, No -7 2.2 Medium voltage windings are reinforced by means of fiberglass Yes - 10; No – 7 2.3 Low voltage windings are reinforced by means of fiberglass Yes - 10; No – 7

30

10

10

10

3. Minimal distance between live and earthed metal parts (10) (medium voltage side) Minimal distance between live and earthed metal part as required by this specification - 7 Highest distance between live and earthed metal part – 10 Other - proportional Distances shall be proven by drawings in the technical stage of the bid.

10

4. Dimensions (20) 4.1 Width of transformer as required by this specification – 7; Smallest width dimension - 10; Other - proportional 4.2 Length of transformer as required by this specification – 7; Smallest length dimension - 10; Other - proportional

20

10

10

Minimum grade of the technical evaluation of the proposal which fulfills I.E.Co technical requirements will be 70.


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APPENDIX "L"

Dimensions between the high voltage parts


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Please fill-in the following required data:

Please fill in the following dimensions:

Rated Power Sn

(kVA)

Rated Line to Line Voltage Un

(kV)

E

(mm)

D

(mm)

630 12.6

1000 12.6

630 22

1000 22

630 33

- Transformer manufacturer name: . - High voltage windings manufacturer name: . Signature of Bidder _____________________ Name of Bidder: __ _____ _ Drawing no. 4: Dimensions between the high voltage parts

specification nts-58 for distribution network cast resin power transformers

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