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沙特阿美公司 14-SAMSS-533 规范
Materials System Specification
14-SAMSS-533
Three-Phase Dry-Type Power Transformers
31 July 2010 Document Responsibility: Electrical Substations Equipment Standards
Committee
Saudi Aramco DeskTop Standards
Table of Contents
1 Scope............................................................. 2
2 Conflicts and Deviations................................. 2
3 References..................................................... 2
4 Qualifications.................................................. 4
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5 Service Conditions.......................................... 4
6 Information Required with Quotation.............. 4
7 General Requirements................................... 5
8 Construction................................................... 5
9 Inspection and Testing................................. 11
Data Schedule.................................................... 13
Previous Issue: 22 September 2008
Next Planned Update: 31 July 2015
Primary contact: Ishwait, Basel A. on 966-3-8760288
Page 1 of 14
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
1 Scope
1.1 This specification defines the mandatory requirements for three-phase, dry-type,
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power transformers rated 501 kVA and larger with a high-voltage winding of
601 V or higher for operation in 60 Hz power systems.
The specific requirements of dry-type transformers shall be given in the Buyer's
Purchase Order documents for this equipment.
The transformer unit shall be designed, built and tested in accordance with
American National Standards Institute/Institute of Electrical and Electronics
Engineers (ANSI/IEEE) Standards C57.12.01 as supplemented by this
specification and all applicable companion guides and codes as referenced in This
specification defines the basic features of the equipment required and shall
take precedence over all standards and codes as referenced.
The equipment
manufacturer shall ensure that the applicable standards are adhered to in
addition to this specification. 1.2 1.3 1.4
2 Conflicts and Deviations
2.1
2.2
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2.3 If there are any conflicts between this Specification and associated purchasing,
project or engineering documents, this specification shall take precedence. Direct
all requests to deviate from this Specification in writing to the Company or Buyer
Representative, who shall follow internal company waiver procedure. 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.
3 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.
3.1 Saudi Aramco References
Saudi Aramco Inspection Requirements
Three-Phase Dry-Type Power Transformers
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
Aramco Forms and Data Sheets
Saudi
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Non-Material Requirements for Transformers:
Small, Medium, & Large, Power &
Distribution
3.2 Industry Codes and Standards
American Society for Testing and Materials
Standard Method for Specifying Color by the
Munsell System
American National Standards Institute
Standard General Requirements for Dry-Type
Distribution and Power Transformers
including those with Solid Cast and/or Resin-
Encapsulated Windings
Pad-Mounted Equipment-Enclosure Integrity
Requirements for Ventilated Dry-Type Power
Transformers, 501 kVA and Larger, Three-
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Phase, with High-Voltage 601 to 34500 Volts,
Low-Voltage 208Y/120 to 4160 Volts
Requirements for Sealed Dry-Type Power
Transformers, 501 kVA and Larger, Three-
Phase, with High-Voltage 601 to 34500 Volts,
Low-Voltage 208Y/120 to 4160 Volts
IEEE Standard Test Code for Dry-Type
Distribution and Power Transformers International Electrotechnical Commission
IEC 60227
IEC 60332
Polyvinyl Chloride Insulated Cables of Rated Voltages up to 450/750 Volts Part 1:
General Requirements Part 2: Test Methods Part 3: Non-sheathed Cables for Fixed Wiring
Tests on Electric Cables Under Fire Conditions Part 1: Test on a Single Vertical
Insulated Wire or Cable Part 3: Test on Bundled Wire or Cables
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
Cables with Extruded Insulation and their
Accessories for Rated Voltages from 1 kV up to
Power
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30 kV
Part 1: Cables for Rated Voltages of 1 kV and 3 kV National Electrical Manufacturers
Association
Enclosures for Industrial Control and Systems Transformers, Regulators and Reactors
National Fire Protection Association
4 Qualifications
Transformer designs and materials used in the transformer shall have a minimum of
two
(2) years of verifiable, satisfactory performance and proven field experience.
5 Service Conditions
5.1 As specified in the DATA SCHEDULE Ventilated Self-cooled Class AA or
Ventilated self cooled/forced-air-cooled Class AA/FA transformers shall be
utilized indoor.
outdoor.
Only sealed self-cooled, Class GA transformers shall be used
Unless otherwise specified, they shall be suitable for continuous
operation at locations up to an altitude of 1000 meters.
Outdoor equipment supplied under this specification shall be suitable for use in
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locations that are subject to sand and dust storms, fog, and air borne
contaminants, including NaCl (Sodium Chloride) to 300 ppm and MgCl
(Magnesium Chloride) to 50 ppm.
Unless otherwise specified, equipment shall be suitable for use in locations with
the following ambient temperatures:
a)
b)
c)
6 Average monthly normal maximum (hottest month), 45°C; Average daily temperature
(hottest month) 40°C; Maximum daily peak 50°C. National Electrical Code (NEC) 5.2
5.3 Information Required with Quotation
6.1 The Vendor shall supply the following information with the Quotation.
This is
in addition to the information required within the Quotation Request or Purchase
Order Documents.
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
6.1.1
Fully completed DATA SCHEDULE.
6.1.2 Certified Design Tests Certificates for the tests performed as outlined in
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specified in the DATA SCHEDULE.
6.1.3 User's List of the same equipment which has been in service for a
minimum of two (2) years.
The list should indicate as a minimum:
a)
b)
c)
6.2 User company name and address. Installation site and contact address. Date of
installation. The "Certified Design Tests" Certificates mentioned above shall be from,
or
endorsed by an independent testing laboratory and shall provide clear, traceable
evidence that the subject tests were performed.
7 General Requirements
7.1
7.2 This specification shall take precedence over any referenced third party
document(s).
Technical reference documents shall be of the latest issue. The Voltage
ratings, Kilovolt-Ampere ratings and Basic Lightning Impulse
Levels (BILs) for ventilated dry-type Power transformers shall be in accordance All
documentation shall be in the English language.
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requirements. 7.3 7.4 8 Construction
8.1 Enclosure (Housing)
8.1.1 (Munsell Notation 8.3 G6 10/0.54), unless otherwise specified.
8.1.2 Transformer enclosure shall be self supporting, non-combustible,
moisture resistant and protected against corrosion.
Enclosure design
shall be such as to permit easy access to the high and low voltage
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
for outgoing cable connections.
terminals
Access to the core and coil
assembly for inspection and testing shall also be provided.
8.1.3 Transformer enclosures for indoor use shall be ventilated drip-proof, openings
shall be protected against falling dirt.
8.1.4 All transformers shall bear permanently attached nameplates.
8.1.4.1 The nameplates shall be stainless steel and attached with
stainless steel hardware.
Entries shall be marked by etching,
engraving or other permanent marking method.
8.1.4.2 The nameplate shall be in the English language according to
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American usage.
8.1.4.3 Danger and warning labels shall be written in both Arabic and
English, utilizing white characters on a red background.
If
noted in the Purchase Order the Arabic warning labels will be
provided by others.
8.1.5 In addition to the transformer data the nameplate(s) shall also include the
following which may be on a separate plate:
1)
2)
3)
4)
5)
6)
8.2 Cores
8.2.1 Cores shall be fabricated using high grade, grain-oriented silicon steel
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laminations with high magnetic permeability.
Maximum magnetic flux
densities shall be kept well below the saturation point.
laminations shall be tightly clamped and compressed.
burr-free and to exact length.
The core
All cuts to be
Core clamps and all structural parts shall
be grounded to prevent induced voltage build up.
8.2.2 Cores shall have flush bottoms.
Design and fabrication shall be done in
such a manner that will minimize losses and audible sound level. Manufacturer's plant
location Buyer's Purchase Order number Manufacturer's Order reference number
Equipment year of manufacture
Equipment Serial Number Equipment Model Number
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
8.3 Coils
8.3.1 The high and low voltage coils shall be constructed of electrical grade
copper as an assembly and shall be able to withstand the mechanical and
thermal stresses produced by external short circuits under the conditions 8.3.2 Coil
construction shall be designed to limit transformer winding
temperature rise when operating at nominal kVA rating to:
? 80°C Average winding temperature rise (by resistance)
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? 110°C Hot spot winding rise.
8.3.3 Transformer core and coil assemblies shall be completely emersed in an
insulating resin or varnish and oven cured, or encapsulated with
polyester (epoxy) resin using a Vacuum Pressure Impregnation (VPI)
process.
Cores for transformers utilizing solid cast coil winding (coils in
an epoxy mold completely sealed) shall be completely emersed in an
insulating resin or varnish and oven cured.
As specified in the DATA
SCHEDULE the transformer coils shall be resin encapsulated
construction or solid cast (coils in a mold completely sealed)
construction.
8.4 Taps
Each Transformer shall be furnished with facilities for changing taps with the
transformer de-energized.
Tapping shall be on the high voltage winding to
allow for variation of the incoming primary voltage.
Unless otherwise specified,
transformers shall have two voltage taps 2-?% below normal voltage and two
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voltage taps 2-? above normal voltage.
All taps shall have full current capacity.
8.4.1 Ventilated Dry-Type transformers shall be provided with facilities for
changing taps that provide easy access to the tap terminals.
The tap
terminals shall be grouped so that the taps are changed by moving
terminal strips (jumpers) from one connection point to another.
The tap
connections shall be clearly marked.
8.4.2 Sealed Dry-Type transformers shall be provided with a tap changer for
de-energized operation.
The operating handle shall be brought out
through the enclosure at a convenient height for the design.
connection shall be clearly marked.
The tap
The tap changer handle shall have
provision for padlocking and shall provide visible indication of the tap
position without unlocking.
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
Winding Connections
Unless otherwise specified, all transformers shall have delta-connected high
voltage windings and wye-connected low voltage windings.
The angular
8.5
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displacement between high-voltage and low-voltage phase voltages shall be
30 degrees, with the low voltage lagging the high voltage.
8.6 Insulation
8.6.1 The insulation system shall be a minimum of ANSI Class 185 Insulation.
8.6.2 All insulation materials shall be flame retardant and shall not support
combustion.
8.6.3 All materials shall be resistant to ozone, or otherwise protected from
ionization products.
8.7 Impedance
The guaranteed values of impedance at self cooled rating shall be referenced to
the rated voltage tap and shall be not less than 4% at 80°C (subject to tolerance
8.8 Cooling
Transformers shall be self-cooled Ventilated Class AA or Sealed Class GA.
Forced-air cooling may be specified for Ventilated self cooled/forced-air-cooled
Class AA/FA transformers.
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8.8.1 The forced air cooling system shall include:
a)
b)
c)
d)
e)
f)
g)
h)
i)
8.8.2 thermal sensors, fans, control wiring, control box with test switch, current
limiting fuses, indicating lights, alarm, alarm silencing relay, and push buttons.
The cooling fans and controls shall be capable to operate on 120 VAC,
single phase, unless other auxiliary voltage is specified in the DATA
SCHEDULE.
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
fans shall be fitted with protective fan guards or located within the
8.8.3 All
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transformer enclosure to protect personnel from incidental access.
The
fan guards shall have wires spaced to limit openings to less than
12.7 mm.
8.9 Base
8.9.1
8.9.2 All transformers shall be equipped with the permanent heavy duty base assemblies
suitable for skidding in any direction. The transformer base shall have provisions
for lifting and/or jacking
the unit.
This feature shall be appropriately described on preliminary
and final drawings.
Anti vibration mountings are required for floor mounted transformers
located indoors.
Anti vibration pads shall be fitted between the
enclosure and its mounting.
Electrical continuity, for grounding, shall
be maintained between these components. 8.9.3
8.10 Control and Terminal Enclosures
8.10.1 Undrilled gland plates are not acceptable.
For transport prior to
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erection, conduit hubs shall be fitted with threaded steel plugs; bus
duct and pothead entrances shall be fitted with steel plates.
When required, control cabinets and accessory wiring shall be separate
from terminal enclosures and shall incorporate the following:
1) Control cabinet(s) shall be mounted on the transformer, or within
the transformer enclosure shall be accessible from grade, and
shall house all terminal connections for transformer accessories,
control equipment and other devices.
All wiring requiring
external connections shall be terminated to 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.
Shorting terminal blocks
shall be provided for current transformer circuits and shall be
capable of receiving 10 mm? (8 AWG) wire.
for bottom entry.
Cable or conduit top entry is not acceptable.
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Doors shall be hinged, capable of opening not less than 120°, and
equipped with stainless steel hardware including locking devices. 8.10.2 2)
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
3) Outdoor
Control cabinet(s) shall be provided with a space heater,
suitable for 120 VAC operation but rated for 240 V.
A disconnecting means shall be provided for each power supply.
A wiring diagram, printed on weather resistant material
indicating the control cabinet circuits and fuse or circuit breaker
ratings shall be affixed inside the cabinet door.
All relays, switches, and terminal blocks shall be securely
attached with screws.
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, without conduit.
All wiring and cables shall comply with the requirements of the SIS, THHN or XHHW;
XHHW insulation shall be XLPE.
(minimum temperature rating 85°C).
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All wiring shall be a minimum of 2.5 mm? (14 AWG) 600 V
stranded copper.
Each wire shall be identified with a thermoplastic, slip-on wire
marker with permanently printed characters.
Snap-on or
adhesive type markers are prohibited.
Insulated, ring or locking tongue, compression (crimped)
terminals shall be provided for all control wiring.
A maximum of
two conductors may be terminated on a single terminal. 4) 5) 6) 7) 8) 9)
8.11 Grounding
8.11.1
8.11.2 Internal and external grounding terminals shall be provided for grounding
cable, armor, shield, and stress-relieving devices. Transformer core shall be
grounded to the frame in accordance with core shall be visibly grounded to the
enclosure by means of a flexible
grounding conductor.
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
Transformers shall have provision for a minimum of two equipment
8.11.3
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grounding connections.
9 Inspection and Testing
9.1 General
9.1.1 Tests shall be carried out in accordance with the requirements of clarification
as to exactly what tests are expected to be performed on
the transformers, the Routine Tests and Design Tests required are listed
below.
information on inspection procedures. 9.1.2 9.2 Routine Tests
Routine production tests shall be performed on the transformers as required by a)
b)
c)
d)
e)
f)
g)
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h)
i) Resistance measurement of all windings Ratio Polarity and Phase Relation No-Load
Losses and Excitation Current Impedance Voltage and Load Losses Dielectric Tests
-Applied voltage Dielectric Tests -Induced voltage Partial discharge (for
transformers above 1.2 kV) Mechanical -Leak test (for sealed transformers)
Commentary Note:
Transformer manufacturer will supply the magnitude of voltage and current used
in each of the specified test.
9.3 Design (Type) Tests transformer of the type and design offered.
They include
but are not limited to:
a) Temperature Rise
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
b)
c)
d)
e) Dielectric Tests-Impulse Partial Discharge Audible Sound Level Mechanical
-Pressure test (for sealed transformers)
Commentary Note:
The audio sound level and radio influence level shall not exceed the limits nameplate
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and test reports shall show the measured sound level in decibels.
31 July 2010 Revision Summary Revised the "Next Planned Update".
Reaffirmed the
contents of the document, and reissued
with no other changes.
Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
Data Schedule
Page 1 of 2
Attachment to 14-SAMSS-533
Three-Phase Dry-Type Power Transformers
Description
Transformer Voltage:
High Side (Delta) kV
Low Side (WYE) kV
Transformer Rating:
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(Nominal) kVA
Type of Transformer:
Indoor
Outdoor Buyer's Required Values Vendor's Proposed Values (
(
) (
) (
Indoor Transformer Cooling Method:
Ventilated Self-Cooled Class AA
Ventilated Self-Cooled/Forced Air
Cooled Class AA/FA
Impedance:
Required
Minimum 4%
Other (specify in %)
Enclosure for Indoor Transformer:
Standard (Type 2)
Other (specify)
) (
) (
)(
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)
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)
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Enclosure Paint Color:
Standard (Light gray)
Other (specify)
Coil Assembly Construction:
Resin Encapsulated
Solid Cast (
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Next Planned Update: 31 July 2015 Three-Phase Dry-Type Power Transformers
Data Schedule
Page 2 of 2
Attachment to 14-SAMSS-533
Three-Phase Dry-Type Power Transformers
Description Buyer's Required Values Vendor's Proposed Values Tap Changer Range
(De-energized):
Standard (2-?% FCAN, 2-?% FCBN) (
)
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Other (specify)
Auxiliary Power Supply:
120 V AC (single phase)
Other (specify)
High Voltage Winding Terminations:
Internal
Flanged Throat
Terminal Enclosure
Incoming Cable Size (mm?/AWG)
Low Voltage Winding Terminations:
Internal
Flanged Throat
Terminal Enclosure
Outgoing Cable Size
Neutral Cable Size (mm?/AWG) (
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Remarks:
BUYER VENDOR
_________________________________________
_____________________________________________
_________________________________________
_____________________________________________
_________________________________________
_____________________________________________
_________________________________________
_____________________________________________
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