14-SAMSS-531

Previous Issue: 22 September 2008 Next Planned Update: 2 June 2017

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Primary contact: Basel Ishwait on 966-3-8809664

Copyright©Saudi Aramco 2012. All rights reserved.

Materials System Specification

14-SAMSS-531 2 June 2012

Power Transformers

Document Responsibility: Electrical Substations Equipment Standards Committee

Saudi Aramco DeskTop Standards

Table of Contents

I Scope............................................................. 2

II Conflicts and Deviations................................. 2

III References..................................................... 2

IV General Requirements................................... 4

V Modifications to ANSI C57.12.10................... 4 Data Schedule – 1.............................................. 15

Data Schedule – 2.............................................. 22

Document Responsibility: Electrical Substations Equipment Standards Committee 14-SAMSS-531

Draft Date: 2 June 2012

Next Planned Update: 2 June 2017 Power Transformers

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I Scope

This Specification defines the mandatory requirements of all 50 and 60 Hz, oil-filled

power transformers and autotransformers, with tap changers for de-energized or load-

tap-changing operation.

II Conflicts and Deviations

A. If there are any conflicts between this Specification and associated purchasing,

project or engineering documents, this specification shall take precedence.

B. Direct all requests to deviate from this Specification in writing to the Company or

Buyer Representative, who shall follow internal company waiver procedure.

C. The designation "Commentary" is used to label a sub-paragraph that contains

comments that are explanatory or advisory. These comments are not mandatory,

except to the extent that they explain mandatory requirements contained in this

SAMSS.

III References

The following is a summary of all the documents which have been mentioned within

this Specification. The specific part(s) of these documents which are applicable have

been identified throughout this Specification.

A. Saudi Aramco References

Saudi Aramco Materials System Specification

26-SAMSS-059 Insulating Oil

Saudi Aramco Inspection Requirements

Form 175-140500 Power Transformers

Saudi Aramco Forms and Data Sheets

Form NMR-7906 Non-Material Requirements for Transformers:

Small, Medium & Large, Power Distribution

B. Industry Codes and Standards

American National Standards Institute

ANSI C57.12.00 Standard General Requirements for Liquid-

Immersed Distribution, Power, and Regulating

Transformers

http://standards/docs/SAMSS/PDF/26-SAMSS-059.pdf

http://standards/docs/Inspection_Requirements/PDF/175-140500.pdf

http://standards/docs/Nonmaterial_Requirements/PDF/SA-7906.pdf




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ANSI C57.12.10-2010 Standard Requirements for Liquid-Immersed

Power Transformers

ANSI/IEEE C57.12.90 Standard Test Code for Liquid-Immersed

Distribution, Power, and Regulating

Transformers and Guide for Short-Circuit

Testing of Distribution and Power

Transformers

ANSI/IEEE C57.91 IEEE Guide for Loading Mineral-Oil-Immersed

Transformers

ANSI/NFPA 70 National Electrical Code

National Electrical Manufacturers Association

NEMA ICS 6 Industrial Control and Systems Enclosures

NEMA MG 1 Motors

NEMA TR 1 Transformers, Regulators, and Reactors

American Society for Testing and Materials

ASTM D3487 Standard Specification for Mineral Insulating Oil

Used in Electrical Apparatus

International Electrotechnical Commission

IEC 60076 Power Transformers

IEC 60227 Polyvinyl Chloride Insulated Cables of Rated

Voltages up to and including 450/750 V

IEC 60332 Tests on Cables under Fire Conditions

IEC 60502 Power Cables with Extruded Insulation and their

Accessories for Rated Voltages from 1 kV up to

30 kV

IEC 60296 Specification for New Insulating Oils for

Transformers and Switchgear

IEC 60034 Rotating Electrical Machines

IEC 60529 Degrees of Protection Provided by Enclosures

IV General Requirements

A) Refer to Section II for direction on conflict resolution between documents. For

example, if there are any conflicts between this Specification and associated

project or engineering documents, this specification shall take precedence.




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B) Information Required with Quotation

The Vendor shall supply the following information with the Quotation.

This list in addition to the information requested within the Quotation request or

Purchase Order Documents:

I) User's list of the same or similar equipment, which has a minimum of two

years verifiable, proven field experience. The list shall indicate as a

minimum:

1) User company name

2) Installation site

3) Date of installation

II) Certified design or type test data as specified in ANSI/IEEE C57.12.00 of a

transformer with similar voltage, MVA and winding configuration.

C) Language

The English language, in accordance with American usage, shall be used at all

times with respect to documents, drawings, labels and technical terms, procured or

prepared by the Vendor pertaining to any work in accordance with this document.

D) Inspection

Saudi Aramco Inspection Requirements Form 175-140500 provides information

on inspection procedures.

E) Other requirements

Saudi Aramco form NMR-7906 provides information on non-material

requirements.

V Modifications to ANSI C57.12.10

The following paragraph numbers refer to ANSI C57.12.10, Standard Requirements for

Liquid-Immersed Power Transformers ", which is part of this specification. The text in

each paragraph below is an addition, exception, modification, or deletion to ANSI

C57.12.10 as noted. Paragraph numbers not appearing in ANSI C57.12.10 are new

paragraphs to be inserted in numerical order.

4 Rating Data

4 (Addition-1) Transformers shall be rated in accordance with ANSI

C57.12.00, Section 4.1 "Usual Service Conditions".

http://standards/docs/Inspection_Requirements/PDF/175-140500.pdf

http://standards/docs/Nonmaterial_Requirements/PDF/SA-7906.pdf




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Commentary Note:

1. The kVA rating specified on the data sheet has been increased (de-rated) as required by Saudi Aramco Engineering Standards to obtain a satisfactory site rating for ambient temperatures higher than 30°C.

2. Specified transformer ratings are based on ANSI standard 65°C rise over a 30°C average ambient

3. Vendor should not consider additional de-rating beyond what is listed on the data sheet.

4 (Addition-2) Transformers are subject to sand and dust storms, salt laden

winds and fog, and airborn chemical contaminants from industrial process

plants. The airborn salt levels of NaC1 may be 300 ppm and of MgC1

50 ppm.

4 (Addition-3) The temperature of metal surfaces exposed to direct solar

radiation can reach 75°C. The interiors of unventilated metal cabinets

(exclusive of internal heat-producing sources) can reach 56°C. The

transformer and its accessories, including cabinets and junction boxes, shall

be designed accordingly. Sun shields shall not be fitted, unless specified in

Data Schedule - 1.

4.2 Kilovolt-Ampere Ratings

4.2 (Addition-1) Power transformers shall be designed such that the actual OA

and FA derating factors do not exceed the ANSI Loading Guidelines for

continuous operation at unusual ambient temperatures without reducing

normal life expectancy.

4.2 (Addition-2) The attachments and accessories such as bushings, instrument

transformers, tap changers, and surge arresters shall be compatible with the

ANSI/IEEE C57.91 loading guidelines and shall not limit the transformer

kVA rating at unusual ambient temperatures.

4.2 (Exception) Kilovolt-ampere ratings shall be as shown in Table 2, self-cooled

(OA) and first-stage forced-cooled (FA). Second-stage forced cooling shall

not be provided, unless specified otherwise in Data Schedule - 1.

Commentary Note:

The next larger preferred OA rating is 75 and 100 MVA

4.4 Insulation Level

4.4 (Addition-1) All windings rated 69 kV and below, including the neutral

ends, shall have ungraded BIL insulation levels.




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(Addition-2) All windings above 69 kV that are wye-connected and solidly-

grounded shall have graded insulation, and the neutral ends shall have

insulation rated for 34.5 kV.

(Addition-3) Wye-connected windings that are ungrounded, or grounded

through impedance, shall have ungraded BIL insulation levels.

(Addition-4) The minimum winding BIL insulation levels shall be as

follows:

1) As specified in the ANSI tables or unless specified otherwise in 2)

below.

2) For transformers with load tap changing larger than 12 MVA the

minimum winding BIL insulation levels shall be per Table 1 of this

specification.

Table 1 – Minimum Winding BIL

Nominal Voltage (kV)

Minimum Winding BIL (kV)

2.4 60

4.16 75

13.8 110

34.5 200

69 350

110 / 115 450

132 650

230 900

380 1425

4.5 Taps

4.5.1 If specified, high-voltage winding taps for de-energized operation shall be

provided with 2.5% and 5.0% above rated voltage, and 2.5% and 5.0%

below rated voltage.

4.5.2 (Exception) Transformers with Load Tap Changers (LTC) when specified

shall be furnished in the high-voltage winding to provide approximately ±

10% automatic adjustment of the low voltage winding voltage, in

approximately 5/8% steps with 16 steps above and 16 steps below rated

voltage.




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4.5.2 All (LTC) shall be equipped for remote operation.

4.6 Impedance Voltage

4.6.1 (Exceptions) The percent impedance voltage shall be in accordance with

Table 2 below for new projects or as specified in the data schedule for

replacement transformers in existing facilities.

Table 2 — Percent impedance at self-cooled (ONAN) rating

High-voltage BIL (kV)

Without LTC

With LTC

Low Voltage 480 V

Low Voltage 2400V

and Above

Low Voltage 2400V

and Above

≤ 110 5.75* 5.5* -

150 6.75 6.5 7.0

200 7.25 7.0 7.5

250 7.75 7.5 8.0

350 8.0 8.5

450 8.5 9.0

550 9.0 9.5

650 9.5 10.0

750 10.0 10.5

900 10.5 11.0

1425 12 12.5

*For transformers greater than 5000kVA self-cooled, these values shall be the same as those shown for 150 kV HV BIL.

4.8 Routine Tests

4.8 (Addition-1) The Vendor shall provide in Data Schedule - 2 as part of his

Bid the guaranteed values of load and no-load losses in accordance with

ANSI C57.12.00. The load losses shall be based on the OA self-cooled

rating with a winding temperature of 85°C. The no-load losses shall be

based at rated nominal voltage at nominal tap position and 20°C winding

temperature.

When Loss Evaluation Constants A and B are provided in Data Schedule - 1,

the bids will be evaluated by capitalizing the losses. The Vendor shall

supply a transformer designed to minimize the total present value price C in

the following equation:




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C = P + (A * Li) + (B * Lc) (1)

Where:

C = total evaluated present value price used for bid comparison

purposes;

P = transformer quoted price, including delivery to site;

A = cost/kW of no-load loss from Data Schedule-1;

Li = guaranteed no-load loss in kW at rated voltage;

B = cost/kW of load loss from Data Schedule-1;

Lc = guaranteed load loss in kW at the OA self-cooled rating at

winding temperature of 85°C.

4.8 (Addition-2) Guarantee and Warranty

In addition to the guarantee and warranty specified in contract or purchase

order documents, the No-load and Load Losses shall be guaranteed and

measured in accordance with ANSI/IEEE C57.12.90. If the losses, when

measured, are found to be higher than the guaranteed losses, the cost of the

transformer shall be reduced by an amount equal to the difference between

the actual losses and the guaranteed losses in kilowatts as specified above

multiplied by the evaluation factor $/kW given in the data sheet.

5 Construction

5.0 (Addition) High and low voltage windings shall be copper.

5.1 (Exception) Except as follows all accessories listed in Figure 1 shall be

furnished for all transformers. Load tap changing equipment and auxiliary

cooling control shall be furnished only when required by this Specification

or Data Schedule - 1.

5.1 (Addition-3) Control cabinets and accessory wiring shall be separate from

junction boxes and shall incorporate the following requirements:

1) Control cabinet(s) shall be tank-mounted, shall be accessible from

grade, and shall house all terminal connections for transformer

accessories and all control equipment and other devices. All wiring

requiring Buyer's interconnection shall be terminated to suitable

terminal blocks. Terminal blocks shall be one-piece, phenolic, barrier

type, rated 20 A, 600 V minimum with prenumbered marking strips

and suitable for two terminations per point. A maximum or 2 wires per

point is permitted. Shorting terminal blocks shall be provided for




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current transformer circuits and shall be capable of receiving 10 mm²

(8 AWG) wire.

2) Control cabinet(s) shall be outdoor, raintight, dust-tight, NEMA ICS 6

Type 3, suitable for bottom entry. Cable or conduit top entry is not

acceptable. Doors shall be double or full-length hinged, capable of

opening not less than 120 degrees, and equipped with stainless steel

hardware, including locking devices.

3) Control cabinets shall be provided with a 240 V rated space heater with

thermostat, a 120 V convenience outlet to NEMA 5-20R configuration,

and a 120 V overhead light. All three devices shall be connected for

120 V AC. A door-mounted ammeter shall be provided to indicate that

the space heater is in service. A disconnecting means shall be

provided for each power supply. A wiring diagram indicating the

control cabinet circuits and fuse or circuit breaker ratings, shall be

affixed inside the cabinet door.

4) All relays, switches, terminal blocks, and other devices shall be

identified by engraved nameplate(s), which shall be securely attached

without the use of adhesives.

5) Wiring shall be run in hot dipped galvanized rigid steel conduit.

Where flexibility is required, liquid-tight flexible metal conduit may be

used in lengths not to exceed 500 mm. Alternatively, metal clad cable

or armored cable per IEC 60502 may be used without conduit.

6) All wiring and cables shall comply with the requirements of the

National Electrical Code, ANSI/NFPA 70, (latest edition). Acceptable

cable types are THHN and XHHW; XHHW insulation shall be XLPE.

Alternatively, IEC 60227 wires or IEC 60502 cables, with minimum

temperature rating of 85°C, fire retardant per IEC 60332, may be used.

7) All wiring shall be a minimum of 2.5 mm² (14 AWG) 600-V stranded

copper.

Exception:

IEC armored cables noted above utilize solid conductors.

8) Each wire shall be identified with a thermoplastic, slip-on wire marker

with permanently printed characters. Snap-on or adhesive type

markers are prohibited.

9) Insulated, ring or forked tongue, compression (crimped) terminals shall

be provided for all control wiring. A maximum of two conductors may

be terminated on a single terminal.




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10) Where accessory equipment requires capillary tubing and attachments,

stainless steel tubing shall be used throughout.

5.1 The enclosures shall be raintight and dust-tight, National Electrical

Manufacturers Association, NEMA ICS 6 Type 3 or IEC 60529 IP 54.

Undrilled gland plates are not acceptable. For transport prior to erection,

conduit hubs shall be sealed with threaded steel plugs; bus-duct and pothead

entrances shall be sealed with steel plates.

5.1 (Exception) All terminal blocks shall be located in the control cabinet.

5.1 Additional Requirements

A. Painting

The paint color shall be light grey. All painted surfaces shall have the

Vendor's standard finish with a minimum thickness or 5-mil dry

thickness.

B. Noise Levels

Transformer noise levels shall not exceed NEMA TR 1 Standards for

OA, FA, or FOA operation.

5.1.2 (Exception) A magnetic liquid or a hydraulic level gauge shall be provided

on all transformers. If Hydraulic gauge is provided it shall be located about

1.75 meters from grade level. The alarm contacts shall be rated and wired in

accordance with Section 5.1.10 and 5.1.11 of this ANSI Standard.

5.1.3 (Addition) A liquid temperature indicator shall be provided with all

transformers. The two electrically separate sets of contacts shall be rated

and wired in accordance with Section 5.10 and 5.1.11 of this ANSI Standard.

5.1.5 (Addition) A pressure vacuum gauge shall be provided on all transformers

equipped with a sealed tank oil preservation system. The two electrically

separate alarm contacts shall be rated in accordance with Section 5.1.10 and

5.1.11 of this ANSI Standard.

5.1.9 (Exception) A pressure (rate-of-rise)-type relay shall be provided for

transformers 5000 kVA and above. When an auxiliary relay is required it

shall be mounted on the transformer relay panels.

5.1.9 (Addition) Where the tap changer is located in a separate compartment from

the main windings, the transformer manufacturer shall advise the Buyer on




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the availability of a separate rapid pressure-rise relay for the tap changer

compartment.

5.2 (Exception) The neutral bushing BIL levels for wye connected winding rated

above 15 kV shall be as follows:

Impedance-grounded: Same as line bushings, and shall be

interchangeable.

Solidly-grounded: 34.5-kV rating, 200-kV BIL

5.2 (Addition-1) All bushings for outdoor application shall be either wet

process glazed porcelain coated with silicon or a composite type and shall

have a threaded stud.

5.2 (Addition-2) All bushings of the same voltage class shall be interchangeable.

5.2 (Addition-3) All outdoor bushings for nominal system voltages of 69 kV and

above shall have a capacitor tap for testing.

5.2 (Addition-4) The minimum BIL levels of winding bushings shall be as

shown in Table 2 of this specification.

Table 2 – Bushing BIL Level

Nominal Voltage (kV)

Minimum BIL Level (kV)

2.4 60

4.16 75

13.8 110

34.5 200

69 350

110 / 115 650

132 900

230 1050

380 1650

5.2 (Exception-1) Outdoor bushings shall have minimum creepage of 40 mm per

kV line-to-line of nominal system voltage.

5.2 (Exception-2) Type and location of bushings shall be as specified on Data

Schedule-1.




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5.2 (Exception-3) Type and location of bushings for wye-connected low voltage

windings shall be as specified on the Data Schedule-1.

5.2 (Exception-4) Core and Yoke ground leads shall be terminated outside the

main tank on a bushing housed in a separate hand hole located on top of the

cover.

5.4 (Addition-1) Nameplate(s) shall be abrasion resistant, stainless steel and

attached with stainless steel hardware. Entries shall be marked by etching,

engraving or other permanent marking method. The following additional

data is required, and may be on a separate nameplate:

1) Manufacturer's location

2) Year of manufacture

3) Buyer's Purchase Order number

4) Manufacturer's order reference number

5.4 (Addition-2) Danger and warning indicators shall be written both in Arabic

and English.

5.5 (Addition-2) Internal and external grounding terminals shall be provided for

grounding cable, armor, shield, and stress-relieving devices.

5.6.2 (Addition) The number of transformer windings and winding connections

shall be as specified on Data Schedule - 1.

5.7 (Addition-1) A conservator or expansion-tank system, when provided, shall

include a diaphragm or bladder in the auxiliary tank to prevent oil-to-air

contact. Externally mounted expansion bladders are not acceptable.

5.7 (Addition-2) A conservator or expansion-tank system, when provided, shall

have a Buchholz-type relay.

5.7.1 (Exception) Oil preservation system may be sealed-tank or any other system

listed in this Specification for transformers 10 MVA and larger. Conservator

type oil preservation system shall not be used on transformers less than 10

MVA.

5.8 (Addition-1) Tank designs using bell type or detachable underbase

constructions shall not be used.

5.8 (Addition-2) All transformers up to 30,000 kVA, inclusive, shall be shipped

filled with insulating oil. The oil shall be virgin hydrocarbon mineral oil

specifically manufactured for use as electrical insulating oil. The oil shall

contain no additives, and shall meet IEC 60296 Class 1 or ASTM D3487




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Type 1. Larger transformers may be shipped per manufacturer's normal

practice. Detached radiators and conservator tanks shall be shipped dry, and

the oil supplied separately as specified in Saudi Aramco Materials System

Specification 26-SAMSS-059

5.8 (Addition 3) Transformers shall have a label which specifically states that

the oil contains less than 1 ppm polychlorinated biphenyl (PCB).

5.8 (Addition) Valves shall be provided on each transformer equipped with

detachable radiators to enable these radiators to be removed without

affecting the liquid in the tank. The tank drain valves shall be padlockable.

5.8.3 (Exception-1) A pressure relief device shall be provided for all transformers.

5.8.3 (Exception-2) Bolted main tank covers are acceptable.

5.8.3 (Addition-1) Handholes and/or manholes shall have bolted covers.

5.8.3 (Addition-2) It must be possible to remove any cover-mounted bushing

without removing the main tank cover.

5.9 (Addition-1) The Vendor shall supply a disconnect device in the control

cabinet for each power supply.

5.9 (Addition-2) All fans shall be fitted with fan guards. The fan guards shall

have wires spaced to limit openings to less than 12.7 mm.

5.9.1.1 (Exception) The manually operable switch and fan control relay shall be

located in the control cabinet.

5.9.1.2 (Addition) A winding temperature simulator shall be provided on all

transformers with forced-air cooling, and shall control the fans and give

visual indication of winding temperature.

5.9.2 (Addition-1) The voltage for the forced-cooling fans or pump motors shall

be as specified on Data Schedule - 1.

5.9.2 (Addition-2) Fan motors shall be totally-enclosed, 60 Hz, squirrel cage,

induction-type, and shall be suitable for continuous operation in 50°C

ambient temperature. Motors shall conform to the requirements of NEMA

MG 1 or equivalent IEC 60034 standard.

5.9.2 (Exception) Fans and accessories for forced-air cooling shall be supplied on

all transformers rated 2500 kVA OA or larger, and shall not be supplied on

transformers rated less than 2500 kVA.





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5.9.2 (Exception) Three phase motors and motors with other voltages under

600 V are acceptable if specified on Data Schedule - 1.

5.10 (Addition) The power supply shall be as specified on the Data Schedule - 1.

5.12 Junction boxes

5.12.1 (Exception) Junction Boxes shall be provided when specified on Data

Schedule - 1.

5.14 (Exception) A throat connection(s) shall be provided for windings of 350 kV

BIL (69 kV nominal system voltage) or less when specified on the Data

Schedule - 1.

5.15 (Addition) Current transformers shall be provided as specified on the Data

Schedule-1. Provisions shall be provided for installing two CT's per phase.

5.16 (Addition-1) Surge arresters shall be installed and be as specified on Data

Schedule-1, including all terminating accessories, and shall have the

minimum creepage specified in Section 5.2 (Exception-1) of this

Specification. Gapless metal-oxide type surge arresters shall be rated for

60°C peak ambient temperature.

5.16 (Addition-2) The surge arrester voltage rating, class, and type shall be per

Table 3 of this specification.

Table 3 – Surge Arrester

Nominal System Voltage (kV rms)

Arrester Class & Type

Voltage Rating (kV rms)

13.8 Intermediate/Station (1)

15

34.5 Station, Metal-oxide (2)

39

69 Station, Metal-oxide (2)

60


108


192

Notes:

1) Use Station Class for 5000 kVA OA or more.

2) Use gapless metal-oxide non-linear resistor type.

5.16 (Addition-3) An individual ground pad shall be provided for each surge

arrester. The material required for connecting each surge arrester ground

pad to tank ground pads shall be provided and installed by the Vendor.

The ground wires shall be stranded bare copper.

5.19 Other Tests




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5.19 (Addition-1) The following additional test shall be made for transformers

rated 5000 kVA OA or greater:

- Zero-Phase-Sequence Impedance Voltage, including resistive and

reactive components, between all pairs of windings, at 85°C winding

temperature.

5.19 (Addition-2) Additional "Design" and "Other" tests shall be made as

specified on Data Schedule - 1.

Revision Summary

2 June 2012 Major revision.




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Data Schedule – 1

14-SAMSS-531, Power Transformers

(Supplied by Buyer as Part of SAMS Specifications)

ITEM NO. DESCRIPTION DETAILS

1 Buyer's Purchase Order/Quotation Request ____________ Buyer's Budget Item/Job Order Number ____________ Buyer's Line Item Number ____________

2 SAMSS Attachments & Supplements 26-SAMSS-059

3 Supplemental Pages to Data Schedule 1 Auto/Multiwinding Transformer (Yes/No) ____________ Parallel Operation (Yes/No) ____________

4 Number of Phases (One, Three) Three Temperature Rise (C) 65°C Frequency (Hz) 60 Transformer Type (2/3/4winding, or Auto) ____________ Coolant (Mineral Oil-Immersed) Oil-Immersed Operation (Step-up/Step-down/Intertie) ____________ Angular Displacement (ANSI or IEC 60076) ____________ Impedance (% at C on OA Base of High Voltage Winding) ANSI: ____________ Other: ____________ Multi Winding Transformers Impedance HV to LV X (% at 85°C on OA Base of X Secondary Winding) ____________ Impedance HV to LV Y (% at 85°C on OA Base of Y Secondary Winding) ____________ Impedance LV X to LV Y (% at 85°C on OA Base of X or Y winding) ____________

Forced Cooling & Controls (Yes/No) ____________ (not allowed on transformers rated below 2500kVA)

Fan or Pump Motor Voltage & Phases V / Ph

5 Loss Evaluation Constants a) Currency of Evaluation Symbol ____________ b) No-load Loss Constant A Cost/kW ____________ c) Load Loss Constant B Cost/kW ____________

6 High Voltage Winding Continuous OA/FA/FOA Ratings (kVA) ____________ Voltage Rating (kV) ____________ Winding Connection (Delta, Wye) ____________ Neutral Grounding (Solid, Ungrounded) ____________ Winding BIL Level (kV) ____________ Neutral BIL Level (kV) ____________ Surge Arresters a) Mounted Complete (Yes/No) ____________





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Data Schedule - 1 (Cont'd)


7 Low-Voltage Winding Continuous OA/FA/FOA Ratings (kVA) ____________ Voltage Rating (kV) ____________ Winding Connection (Delta, Wye) ____________ Neutral Grounding (Solid, Ungrounded) ____________ Winding BIL Level (kV) ____________ Neutral Grounding (Solid, Ungrounded) ____________ Winding BIL Level (kV) ____________ Neutral BIL Level (kV) ____________ a) Mounted Complete (Yes/No) ____________

8 High Voltage Winding Termination Type: Bushings/Junction Box/Throat Position (Top Cover/Tank Side) ____________ a) Outdoor Bushings Line-end BIL (kV) ____________ Neutral-end Bil (kV) ____________ Terminal Type (Stud/NEMA Pad) ____________ Take-off Angle (Vert/Hor/Angle) ____________ Conductor Size and Type Stranded mm² ____________ Tube IPS-in. ____________ Conductor Material (Copper/Aluminum) ____________ b) Junction Box Type (Cable, Conduit, Separable Connectors) ____________ 1) Cable Junction Box Cable Size (mm²) ____________ Cable Type ____________ Number of Cables ____________ Number of Potheads ____________ Number of Conductors per Phase ____________ 2) Conduit Junction Box Conduit Size (inch) ____________ Number of Hubs ____________ Entry Location (Top/Bottom) ____________ Conductor Size (mm²) ____________ Conductor Material (Cu/Al) ____________ c) Throat Connection (Buyer will supply full details after award of contract)




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9 Low-Voltage Winding Termination Type: Bushings/Junction Box/Throat Position (Top Cover/Tank Side) ____________ a) Outdoor Bushings Line-end BIL (kV) ____________ Neutral-end Bil (kV) ____________ Terminal Type (Stud/NEMA Pad) ____________ Take-off Angle (Vert/Hor/Angle) ____________ Conductor Size and Type Stranded mm² ____________ Tube IPS-in. ____________ Conductor Material (Copper/Aluminum) ____________ b) Junction Box Type (Cable, Conduit, Separable Connectors) ____________ 1) Cable Junction Box Cable Size (mm²) ____________ Cable Type ____________ Number of Cables ____________ Number of Potheads ____________ Number of Conductors per Phase ____________ 2) Conduit Junction Box Conduit Size (inch) ____________ Number of Hubs ____________ Entry Location (Top/Bottom) ____________ Conductor Size (mm²) ____________ Conductor Material (Cu/Al) ____________ 3) Separable Connectors (Yes/No) ____________ c) Throat Connection (Buyer will supply full details after award of contract)

10 Tap Changer Type Type: (De-enegized/Load) ____________ Tap kVA Ratings (Full/Reduced-Capacity) ____________ Location (High Voltage/Low Voltage) ____________ Mechanical Key Interlock (Yes/No) ____________ Compartment Pressure-Rise Relay (Yes/No) ____________ Load Tap Changer Control (If applicable) ____________ Local Control (Yes/No) ____________ Manual Control (Yes/No) ____________ Supervisory Control (Yes/No) ____________ Position Telemetering (Yes/No) ____________ Automatic Voltage Control (Yes/No) ____________ AC Reference Voltage (RMS Nominal) ____________ Parallel Operation Required (Yes/No) ____________ Line Drop Compensator (Yes/No) ____________ Motor Supply Voltage, Phase (AC RMS) ____________




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11 Current Transformers a) High-Voltage Windings/Bushings Relaying | Metering Number Required per Phase ______ _____ Accuracy Class (C-50/100/200/400/800 or 0.3/0.6/1.2) ______ _____ Standard Burden (B-1/2/4/8, or B-0.1/0.2/0.5/0.9/1.8) ______ _____ Primary Current Rating (Amperes) ______ _____ Secondary Current Rating (Amperes) 5 5 Number of Ratios (Single/Dual/Multi) ______ _____ Cont. Thermal Current Rating Factor 1.33 1.33

b) Low-Voltage Windings/Bushings Relaying | Metering Number Required per Phase ______ _____ Accuracy Class (C-50/100/200/400/800 or 0.3/0.6/1.2) ______ _____ Standard Burden (B-1/2/4/8, or B-0.1/0.2/0.5/0.9/1.8) ______ _____ Primary Current Rating (Amperes) ______ _____ Secondary Current Rating (Amperes) 5 5 Number of Ratios (Single/Dual/Multi) ______ _____ Cont. Thermal Current Rating Factor 1.33 1.33

c) Winding Neutral End/Bushing HV LV Number Required ______ _____ Location (Bushing/External) ______ _____ Accuracy Class (C-50/100/200/400/800) ______ _____ Standard Burden (B-1/2/4/8) ______ _____ Primary Current Rating (Amperes) ______ _____ Secondary Current Rating (Amperes) 5 5 Number of Ratios (Single/Dual/Multi) ______ _____ Cont. Thermal Current Rating Factor 1.33 1.33

12 Additional ANSI Test Requirements Zero Sequence Impedance (Yes/No) ____________

13 Miscellaneous & Accessories Combustible Gas Detector (Buchholz relay) (Yes/No) ____________ Padlockable Drain Valve (Yes/No) ____________




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Data Schedule - 1


Supplemental Page for Multiwinding or Autotransformers


1 Tertiary-Voltage Winding (Third Winding) Continuous OA/FA/FOA Ratings (kVA) ____________ Voltage Rating (kV) ____________ Winding Connection (Delta, Wye) ____________ Neutral Grounding (Solid, Ungrounded) ____________ Winding BIL Level (kV) ____________ Neutral BIL Level (kV) ____________ Simultaneous Loading of Tertiary (kVA) ____________

2 Impedance (% at 85 °C on Tertiary OA base) High Voltage to Tertiary ____________ Low Voltage to Tertiary ____________

3 Tertiary-Voltage Winding Termination Type: (Bushings/Junction Box/Throat) ____________ Position (Top Cover/Tank Side) ____________ a) Outdoor Bushings Line-end BIL (kV) ____________ Neutral-end Bil (kV) ____________ Terminal Type (Stud/NEMA Pad) ____________ Take-off Angle (Vert/Hor/Angle) ____________ Conductor Size and Type Stranded mm² ____________ Tube IPS-in. ____________ Conductor Material (Copper/Aluminum) ____________

b) Junction Box Type (Cable, Conduit, Separable Connectors) ____________ 1) Cable Junction Box Cable Size (mm²) ____________ Cable Type ____________ Number of Cables ____________ Number of Potheads ____________ Number of Conductors per Phase ____________ 2) Conduit Junction Box Conduit Size (inch) ____________ Number of Hubs ____________ Entry Location (Top/Bottom) ____________ Conductor Size (mm²) ____________ Conductor Material (Cu/Al) ____________ 3) Separable Connectors (Yes/No) ____________

c) Throat Connection (Buyer will supply full details after award of contract)




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Supplemental Page for Multiwinding or Autotransformers


4 Surge Arresters a) Mounted Complete (Yes/No) ____________ 5 Current Transformers Relaying | Metering a) Bushings Number Required per Phase ______ _____ Accuracy Class (C-50/100/200/400/800 or 0.3/0.6/1.2) ______ _____ Standard Burden (B-1/2/4/8, or B-0.1/0.2/0.5/0.9/1.8) ______ _____ Primary Current Rating (Amperes) ______ _____ Secondary Current Rating (Amperes) 5 5 Number of Ratios (Single/Dual/Multi) ______ _____ Cont. Thermal Current Rating Factor 1.33 1.33

b) Inside Delta (Polarizing) Relaying | Metering Number Required per Phase ____________ Accuracy Class (C-50/100/200/400/800) ____________ Standard Burden (B-1/2/4/8) ____________ Primary Current Rating (Amperes) ____________ Secondary Current Rating (Amperes) 5 Number of Ratios (Single/Dual/Multi) ____________ Cont. Thermal Current Rating Factor 1.33

6 Additional Tertiary Items




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Supplement for Parallel Operation with New or Existing Transformer


1 Parallel Transformer (Existing/Purchased by this request) ____________ Manufacturer ____________ Serial Number ____________ Continuous OA/FA/FOA Ratings (kVA) ____________ High-Voltage Rating (kV) ____________ Low-Voltage Rating (kV) ____________ Angular Displacement (ANSI or IEC 60076) ____________ Impedance (% at 85°C on OA base) a) At Maximum Tap: ____________ b) At Nominal Tap: ____________ c) At Maximum Tap: ____________

Exciting Current at Nominal Tap: ____________ Tap Changer Type (De-energized/Load) ____________ Tap kVA Ratings (Full/Reduced) ____________ Tap Location (High/Low Voltage) ____________ Number of Steps Above: ____________ Below: ____________ Step Size (Percent) ____________ Load Tap Changer Control (If applicable) ____________ Local Control (Yes/No) ____________ Remote Control (Yes/No) ____________ Manual Control (Yes/No) ____________ Supervisory Control (Yes/No) ____________ Position Telemetering (Yes/No) ____________ Automatic Voltage Control (Yes/No) ____________ AC Reference Voltage (RMS Nominal) ____________ Parallel Operation Required (Yes/No) ____________ Line Drop Compensator (Yes/No) ____________ Motor Supply Voltage, Phase (AC RMS) ____________

2 Additional Specifications




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Data Schedule – 2


(To be Submitted by Each Bidder as Part of Quotation)


1 Buyer's Purchase Order/Quotation Request ____________ Buyer's Budget Item/Job Order Number ____________ Buyer's Line Item Number ____________

2 Vendor's Name & Address: ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________

3 Transformer Type (2/3/4 - Winding, Auto) ____________ Coolant ____________ Operation (Step-up/Step-down/Intertie) ____________ Frequency (Hz) ____________ Number of Phases (One/Three) ____________ Continuous OA/FA/FOA Ratings (kVA) ____________ Forced Cooling & Controls (Yes/No) ____________

4 Guaranteed No-Load Loss (rated voltage) (kW) ____________ Guaranteed Load Loss (OA at 85°C) (kW) ____________ Forced Cooling Requirements (kW) ___________q Excitation Current at Rated Voltage % ____________ Angular Displacement (ANSI or IEC 60076) ____________ Impedance(s) (% at 85°C) - on OA base HV-LV ____________ Multi Winding Transformers Impedance HV to LV X (% at 85° C on OA Base of X Secondary Winding ________________ Impedance HV to LV Y (% at 85° C on OA Base of Y Secondary Winding _________________ Impedance LV X to LV Y (% at 85° C on OA Base of X or Y winding _______________________ Impedance(s) (% at 85°C) on TV base HV-TV ____________ Impedance(s) (% at 85°C) on TV base LV-TV ____________ Impedance(s) (% at 85°C) other ____________ 5 Exceptions to Buyer's Specifications

14-SAMSS-531

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Transcript of 14-SAMSS-531