14-SAMSS-531

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................. Deviations...... ...................... ................ ..... 2

III

References..................................................... 2

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

Modifications to ANSI C57.12.10................. C57.12.10...... ............. .. 4

Data Schedule – 1....................... 1.................................... ....................... .......... 15 Data Schedule – 2....................... 2.................................... ....................... .......... 22

Previous Issue: 22 September 2008

Next Planned Update: 2 June 2017 Page 1 of 23

Primary contact: Basel Ishwait on 966-3-8809664 Copyright©Saudi Aramco 2012. All rights reserved.

Document Responsibility: Electrical Substations Equipment Standards Committee Draft Date: 2 June 2012 Next Planned Update: 2 June 2017

I

14-SAMSS-531 Power Transformers

Scope This Specification defines the mandatory requirements of all 50 and 60 Hz, oil-filled o il-filled power transformers and autotransformers, autotransformers, with tap changers for de-energized or loadtap-changing operation.

II

III

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 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. advisory. These comments are not mandatory, except to the extent that they explain mandatory requirements contained in this SAMSS.

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 Form NMR-7906

B.

Non-Material Requirements for Transformers: Small, Medium & Large, Power Distribution

Industry Codes and Standards American National Standards Institute ANSI C57.12.00

Standard General Requirements for Liquid Immersed Distribution, Power, and Regulating Transformers

Page 2 of 23



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

IV

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

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. Page 3 of 23


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) 2) 3)

II) C)

User company name Installation site Date of installation

Certified design or type test data as specified in ANSI/IEEE C57.12.00 of a transformer with similar voltage, MVA and winding configuration.

Language The English language, in accordance with American usage, shall be used at all times with respect to documents, drawings, labels and technic al 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". Page 4 of 23



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 box es, 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. Page 5 of 23



(Addition-2) All windings above 69 kV that are wye-connected and solidlygrounded 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. Page 6 of 23



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: Page 7 of 23



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

Page 8 of 23



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.

Page 9 of 23



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

Page 10 of 23



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.

Page 11 of 23



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) 2) 3) 4)

Manufacturer's location Year of manufacture Buyer's Purchase Order number 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 Page 12 of 23



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 b e 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.

Page 13 of 23



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


(2)

60

115


(2)

108

230


(2)

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 Page 14 of 23


5.19

Power Transformers

(Addition-1) The following additional test shall be made for transformers rated 5000 kVA OA or greater: -

5.19

14-SAMSS-531

Zero-Phase-Sequence Impedance Voltage, including resistive and reactive components, between all pairs of windings, at 85°C winding temperature.

(Addition-2) Additional "Design" and "Other" tests shall be made as specified on Data Schedule - 1.

Revision Summary 2 June 2012

Major revision.

Page 15 of 23



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 Parallel Operation

4

(Yes/No) (Yes/No)

Number of Phases (One, Three) Temperature Rise (C) Frequency (Hz) Transformer Type (2/3/4winding, or Auto) Coolant (Mineral 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 (not allowed on transformers rated below 2500kVA)

(Yes/No)

Fan or Pump Motor Voltage & Phases 5

6

Loss Evaluation Constants a) Currency of Evaluation b) No-load Loss Constant A c) Load Loss Constant B High Voltage Winding Continuous OA/FA/FOA Ratings Voltage Rating Winding Connection Neutral Grounding Winding BIL Level Neutral BIL Level Surge Arresters a) Mounted Complete

____________ ____________ Three 65°C 60 ____________ Oil-Immersed ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ V / Ph

Symbol Cost/kW Cost/kW

____________ ____________ ____________

(kVA) (kV) (Delta, Wye) (Solid, Ungrounded) (kV) (kV)

____________ ____________ ____________ ____________ ____________ ____________

(Yes/No)

____________

Page 16 of 23



Data Schedule - 1 (Cont'd) ITEM NO. 7

8

DESCRIPTION Low-Voltage Winding Continuous OA/FA/FOA Ratings Voltage Rating Winding Connection Neutral Grounding Winding BIL Level Neutral Grounding Winding BIL Level Neutral BIL Level

High Voltage Winding Termination Type: Bushings/Junction Box/Throat Position a) Outdoor Bushings Terminal Type Take-off Angle Conductor Size and Type Conductor Material b) Junction Box Type (Cable, Conduit, Separable Connectors) 1) Cable Junction Box Cable Size Cable Type Number of Cables Number of Potheads Number of Conductors per Phase 2) Conduit Junction Box Conduit Size Number of Hubs Entry Location Conductor Size Conductor Material c) Throat Connection (Buyer will supply full details after award of contract)

DETAILS

(kVA) (kV) (Delta, Wye) (Solid, Ungrounded) (kV) (Solid, Ungrounded) (kV) (kV)

____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ a) Mounted Complete (Yes/No) ____________

(Top Cover/Tank Side) Line-end BIL (kV) Neutral-end Bil (kV) (Stud/NEMA Pad) (Vert/Hor/Angle) Stranded mm² Tube IPS-in. (Copper/Aluminum)

____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________

(mm²)

____________ ____________ ____________ ____________ ____________

(inch)

____________ ____________ ____________ ____________ ____________

(Top/Bottom) (mm²) (Cu/Al)

Page 17 of 23




DESCRIPTION

DETAILS

Low-Voltage Winding Termination Type: Bushings/Junction Box/Throat Position a) Outdoor Bushings Terminal Type Take-off Angle Conductor Size and Type Conductor Material b) Junction Box Type (Cable, Conduit, Separable Connectors) 1) Cable Junction Box Cable Size Cable Type Number of Cables Number of Potheads Number of Conductors per Phase 2) Conduit Junction Box Conduit Size Number of Hubs Entry Location Conductor Size Conductor Material 3) Separable Connectors c) Throat Connection (Buyer will supply full details after award of contract)

10

Tap Changer Type Type: Tap kVA Ratings Location Mechanical Key Interlock Compartment Pressure-Rise Relay Load Tap Changer Control Local Control Manual Control Supervisory Control Position Telemetering Automatic Voltage Control AC Reference Voltage Parallel Operation Required Line Drop Compensator Motor Supply Voltage, Phase


____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________

(mm²)

____________ ____________ ____________ ____________ ____________

(inch) (Top/Bottom) (mm²) (Cu/Al) (Yes/No)

____________ ____________ ____________ ____________ ____________ ____________

(De-enegized/Load) (Full/Reduced-Capacity) (High Voltage/Low Voltage) (Yes/No) (Yes/No) (If applicable) (Yes/No) (Yes/No) (Yes/No) (Yes/No) (Yes/No) (RMS Nominal) (Yes/No) (Yes/No) (AC RMS)

____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________

Page 18 of 23




DESCRIPTION Current Transformers a) High-Voltage Windings/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 Secondary Current Rating Number of Ratios Cont. Thermal Current Rating Factor b) Low-Voltage Windings/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 Secondary Current Rating Number of Ratios Cont. Thermal Current Rating Factor c) Winding Neutral End/Bushing Number Required Location (Bushing/External) Accuracy Class (C-50/100/200/400/800) Standard Burden (B-1/2/4/8) Primary Current Rating Secondary Current Rating Number of Ratios Cont. Thermal Current Rating Factor

12 13

DETAILS

Relaying | Metering

(Amperes) (Amperes) (Single/Dual/Multi)

______ ______ ______ ______ 5 ______ 1.33

_____ _____ _____ _____ 5 _____ 1.33

Relaying | Metering



______ ______ ______ ______ 5 ______ 1.33

_____ _____ _____ _____ 5 _____ 1.33

HV ______ ______ ______ ______ ______ 5 ______ 1.33

LV _____ _____ _____ _____ _____ 5 _____ 1.33

Additional ANSI Test Requirements Zero Sequence Impedance

(Yes/No)

____________

Miscellaneous & Accessories Combustible Gas Detector (Buchholz relay) Padlockable Drain Valve

(Yes/No) (Yes/No)

____________ ____________

Page 19 of 23



Data Schedule - 1 14-SAMSS-531, Power Transformers Supplemental Page for Multiwinding or Autotransformers ITEM NO. 1

2

3

DESCRIPTION Tertiary-Voltage Winding Continuous OA/FA/FOA Ratings Voltage Rating Winding Connection Neutral Grounding Winding BIL Level Neutral BIL Level Simultaneous Loading of Tertiary

DETAILS (Third Winding) (kVA) (kV) (Delta, Wye) (Solid, Ungrounded) (kV) (kV) (kVA)

Impedance (% at 85 °C on Tertiary OA base) High Voltage to Tertiary Low Voltage to Tertiary Tertiary-Voltage Winding Termination Type: (Bushings/Junction Box/Throat) Position a) Outdoor Bushings Terminal Type Take-off Angle Conductor Size and Type Conductor Material b) Junction Box Type (Cable, Conduit, Separable Connectors) 1) Cable Junction Box Cable Size Cable Type Number of Cables Number of Potheads Number of Conductors per Phase 2) Conduit Junction Box Conduit Size Number of Hubs Entry Location Conductor Size Conductor Material 3) Separable Connectors

____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________


____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________

(mm²)

____________ ____________ ____________ ____________ ____________

(inch)

____________ ____________ ____________ ____________ ____________ ____________

(Top/Bottom) (mm²) (Cu/Al) (Yes/No)

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

Page 20 of 23



Data Schedule - 1 (Cont'd) 14-SAMSS-531, Power Transformers Supplemental Page for Multiwinding or Autotransformers ITEM NO. 4 5

DESCRIPTION Surge Arresters a) Mounted Complete Current Transformers 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 Secondary Current Rating Number of Ratios Cont. Thermal Current Rating Factor b) Inside Delta (Polarizing) Number Required per Phase Accuracy Class (C-50/100/200/400/800) Standard Burden (B-1/2/4/8) Primary Current Rating Secondary Current Rating Number of Ratios Cont. Thermal Current Rating Factor

6

DETAILS

(Yes/No)

____________ Relaying | Metering


______ ______ ______ ______ 5 ______ 1.33

_____ _____ _____ _____ 5 _____ 1.33

Relaying | Metering


____________ ____________ ____________ ____________ 5 ____________ 1.33

Additional Tertiary Items

Page 21 of 23



14-SAMSS-531, Power Transformers Supplement for Parallel Operation with New or Existing Transformer ITEM NO. 1

DESCRIPTION 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 Tap kVA Ratings Tap Location Number of Steps Step Size Load Tap Changer Control Local Control Remote Control Manual Control Supervisory Control Position Telemetering Automatic Voltage Control AC Reference Voltage Parallel Operation Required Line Drop Compensator Motor Supply Voltage, Phase

2

DETAILS

(De-energized/Load) (Full/Reduced) (High/Low Voltage) Above: Below: (Percent) (If applicable) (Yes/No) (Yes/No) (Yes/No) (Yes/No) (Yes/No) (Yes/No) (RMS Nominal) (Yes/No) (Yes/No) (AC RMS)

____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________ ____________

Additional Specifications

Page 22 of 23



Data Schedule – 2 14-SAMSS-531, Power Transformers (To be Submitted by Each Bidder as Part of Quotation) ITEM NO.

DESCRIPTION

DETAILS

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 Frequency Number of Phases Continuous OA/FA/FOA Ratings Forced Cooling & Controls

4

5

____________ ____________ ____________

________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________

(Step-up/Step-down/Intertie) (Hz) (One/Three) (kVA) (Yes/No)

____________ ____________ ____________ ____________ ____________ ____________ ____________

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 ____________ Exceptions to Buyer's Specifications

Page 23 of 23

14-SAMSS-531

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