Materials System Specification
14-SAMSS-531
Power Transformers
2 June 2012
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
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
power transformers and 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 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.
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
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 LiquidImmersed Distribution, Power, and Regulating
Transformers
Page 2 of 23
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14-SAMSS-531
Power Transformers
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.
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B)
14-SAMSS-531
Power Transformers
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 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".
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14-SAMSS-531
Power Transformers
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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14-SAMSS-531
Power Transformers
(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.
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Power Transformers
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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Power Transformers
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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Power Transformers
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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Power Transformers
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)
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
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Power Transformers
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)
13.8
34.5
69
115
230
Arrester
Class & Type
Voltage
Rating (kV rms)
Intermediate/Station
(1)
15
Station, Metal-oxide
(2)
39
Station, Metal-oxide
(2)
60
Station, Metal-oxide
(2)
108
Station, Metal-oxide
(2)
192
Notes:
1)
2)
Use Station Class for 5000 kVA OA or more.
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
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.
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Power Transformers
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)
Three
65°C
60
____________
Oil-Immersed
____________
____________
____________
____________
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
____________
____________
____________
V / Ph
Symbol
Cost/kW
Cost/kW
____________
____________
____________
(kVA)
(kV)
(Delta, Wye)
(Solid, Ungrounded)
(kV)
(kV)
____________
____________
____________
____________
____________
____________
(Yes/No)
____________
Page 16 of 23
Document Responsibility: Electrical Substations Equipment Standards Committee
Draft Date: 2 June 2012
Next Planned Update: 2 June 2017
14-SAMSS-531
Power Transformers
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
Document Responsibility: Electrical Substations Equipment Standards Committee
Draft Date: 2 June 2012
Next Planned Update: 2 June 2017
14-SAMSS-531
Power Transformers
Data Schedule - 1 (Cont'd)
ITEM NO.
9
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
(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)
(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
Document Responsibility: Electrical Substations Equipment Standards Committee
Draft Date: 2 June 2012
Next Planned Update: 2 June 2017
14-SAMSS-531
Power Transformers
Data Schedule - 1 (Cont'd)
ITEM NO.
11
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
(Amperes)
(Amperes)
(Single/Dual/Multi)
(Amperes)
(Amperes)
(Single/Dual/Multi)
______
______
______
______
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
Document Responsibility: Electrical Substations Equipment Standards Committee
Draft Date: 2 June 2012
Next Planned Update: 2 June 2017
14-SAMSS-531
Power Transformers
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
____________
____________
____________
____________
____________
____________
____________
____________
____________
(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)
(Yes/No)
c) Throat Connection
(Buyer will supply full details after award of contract)
Page 20 of 23
Document Responsibility: Electrical Substations Equipment Standards Committee
Draft Date: 2 June 2012
Next Planned Update: 2 June 2017
14-SAMSS-531
Power Transformers
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
(Amperes)
(Amperes)
(Single/Dual/Multi)
______
______
______
______
5
______
1.33
_____
_____
_____
_____
5
_____
1.33
Relaying | Metering
(Amperes)
(Amperes)
(Single/Dual/Multi)
____________
____________
____________
____________
5
____________
1.33
Additional Tertiary Items
Page 21 of 23
Document Responsibility: Electrical Substations Equipment Standards Committee
Draft Date: 2 June 2012
Next Planned Update: 2 June 2017
14-SAMSS-531
Power Transformers
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
Document Responsibility: Electrical Substations Equipment Standards Committee
Draft Date: 2 June 2012
Next Planned Update: 2 June 2017
14-SAMSS-531
Power Transformers
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