eGP
egp งานประมูลภาครัฐ
ซื้อระหว่างดำเนินการ

ประกวดราคาซื้อจัดซื้อTR.,1000KVA,3P,22-0.416 0.24KV,DYN11,SCจำนวน1เครื่องEก.2มพย.คพ.0004-2568

การไฟฟ้าส่วนภูมิภาคสาขาเมืองพัทยา 68029294255
฿877,400 ปีงบ 2567 ประกาศ 18 ก.พ. 2568 ชลบุรี
รายละเอียดการจ้าง

สเปคนี้ครอบคลุมถึงคุณสมบัติทางเทคนิค, ข้อกำหนดในการทดสอบ, และข้อกำหนดอื่นๆ ที่เกี่ยวข้องกับหม้อแปลงไฟฟ้าสามเฟสแบบแช่น้ำมัน ระบายความร้อนด้วยตัวเองตามธรรมชาติ (ONAN) ที่มีขนาดตั้งแต่ 50 kVA ถึง 2,000 kVA ออกแบบมาให้ทนทานต่อสภาวะการลัดวงจร เหมาะสำหรับการติดตั้งภายนอกอาคารในระบบจำหน่ายไฟฟ้า 22 kV และ 33 kV, 50 Hz

วัตถุประสงค์หลักของโครงการนี้คือการจัดหาหม้อแปลงที่มีคุณภาพและประสิทธิภาพสูง สามารถทำงานได้อย่างต่อเนื่องในสภาวะแวดล้อมที่กำหนด รวมถึงต้องเป็นไปตามมาตรฐานสากลและข้อกำหนดด้านความปลอดภัย

ขอบเขตงานประกอบด้วยการผลิต, การทดสอบ, การบรรจุ, และการส่งมอบหม้อแปลงไฟฟ้าตามข้อกำหนดทางเทคนิคที่ระบุใน TOR ผู้เสนอราคาต้องแสดงหลักฐานการทดสอบและรับรองจากสถาบันที่เชื่อถือได้ เพื่อยืนยันว่าหม้อแปลงที่เสนอมีคุณสมบัติตามที่กำหนด

รายการส่งมอบประกอบด้วยหม้อแปลงไฟฟ้าที่ผ่านการทดสอบ, รายงานผลการทดสอบ, คู่มือการใช้งานและการบำรุงรักษา, และอุปกรณ์เสริมที่เกี่ยวข้อง

English summary

This specification covers three-phase, oil-immersed, natural self-cooled (ONAN) transformers ranging from 50 kVA to 2,000 kVA, designed and constructed to withstand the thermal and dynamic effects of external short circuits. Suitable for outdoor installation in 22 kV and 33 kV, 50 Hz distribution systems.

The main objective is to procure high-quality, efficient transformers capable of continuous operation under specified environmental conditions and compliant with international standards and safety requirements.

The scope includes manufacturing, testing, packing, and delivering transformers according to the technical specifications in the TOR. Bidders must provide evidence of testing and certification from accredited institutions to confirm the proposed transformers meet the requirements.

Deliverables include tested transformers, test reports, operation and maintenance manuals, and related accessories.

สถานที่ดำเนินการ
คำสำคัญ
หม้อแปลงไฟฟ้าหม้อแปลงไฟฟ้า 3 เฟสหม้อแปลงจำหน่ายหม้อแปลงทนShort Circuitหม้อแปลง PEADistribution TransformerPower Transformerหม้อแปลง 22kVหม้อแปลง 33kVTransformer

ข้อมูลเชิงลึกของโครงการ

AI วิเคราะห์ ปลดล็อกแล้ว

เป้าหมายโครงการ

  • จัดหาหม้อแปลงไฟฟ้าที่มีคุณภาพและประสิทธิภาพสูง
    • ให้หม้อแปลงสามารถทนทานต่อสภาวะการลัดวงจร
    • ให้หม้อแปลงสามารถทำงานได้อย่างต่อเนื่องในสภาวะแวดล้อมที่กำหนด
    • ให้หม้อแปลงเป็นไปตามมาตรฐานสากลและข้อกำหนดด้านความปลอดภัย

ขอบเขตของงาน

  • การออกแบบและผลิตหม้อแปลงไฟฟ้าสามเฟสให้เป็นไปตามข้อกำหนดทางเทคนิค
    • การจัดหาวัสดุและการผลิตตามมาตรฐานที่ระบุ
    • การทดสอบหม้อแปลงไฟฟ้าตามมาตรฐาน IEC 60076 และ TIS 384
    • การบรรจุและการจัดส่งหม้อแปลงไฟฟ้าไปยังสถานที่ที่กำหนด
    • การจัดทำเอกสารทางเทคนิคและคู่มือการใช้งาน
    • การให้การรับประกันและบริการหลังการขาย

สิ่งที่ต้องส่งมอบ

  • หม้อแปลงไฟฟ้าสามเฟสที่ผ่านการทดสอบตามข้อกำหนด
    • รายงานผลการทดสอบ (Type test report, Short circuit test report, Routine test report)
    • คู่มือการใช้งานและการบำรุงรักษา
    • อุปกรณ์เสริมที่เกี่ยวข้อง (HV and LV bushings, Terminal connectors, Bird guard cap, Earthing terminal for surge arrester, Tap changer, Thermometer pocket, Nameplate with connection diagram, Oil drain valve with plug or cap, Sludge drain plug, Earthing terminal, Lifting lugs, Lifting eyes on the cover, Oil level gauge, Compression type cable lug, Pressure relief valve on the tank cover, oil filling plug, Supporting lugs, Transport rollers, Dial type thermometer with adjustable contact(s), Double float Buchholz relay having two (2) contacts (for alarm and tripping))

ระยะเวลาดำเนินการ

คุณสมบัติผู้เสนอราคา

  • Eligibility Requirements: -
  • Standards Compliance:
    • ต้องมีผลการทดสอบตามมาตรฐาน TIS 17025 หรือ ISO/IEC 17025 สำหรับห้องปฏิบัติการทดสอบอิสระ
  • Experience: -
  • Previous Project Cost: -
  • Technical Capabilities:
    • ต้องมีห้องปฏิบัติการที่ได้รับการรับรองตามมาตรฐาน TIS 17025 หรือ ISO/IEC 17025
  • Personnel: -

เกณฑ์การพิจารณา

ข้อกำหนดทางเทคนิค

  • หม้อแปลงไฟฟ้าสามเฟส, แบบแช่น้ำมัน, ระบายความร้อนด้วยตัวเองตามธรรมชาติ (ONAN)
    • พิกัดกำลัง: 50 kVA ถึง 2,000 kVA
    • แรงดันไฟฟ้า: 22 kV หรือ 33 kV ด้าน primary, 416/240 V ด้าน secondary
    • ความถี่: 50 Hz
    • การเชื่อมต่อ: Dyn11
    • สามารถทนต่อการลัดวงจรได้ตามมาตรฐาน IEC 60076-5
    • ระดับฉนวน: เป็นไปตามตารางที่ 5 ใน TOR
    • ขั้วต่อสาย: เป็นไปตามข้อกำหนดใน TOR
    • ถังและสี: เป็นไปตามข้อกำหนดใน TOR, สีเทา RAL 7036

เงื่อนไขสัญญา

คำถามที่พบบ่อย (FAQ)

  • ถาม: หม้อแปลงไฟฟ้าที่เสนอต้องมีคุณสมบัติตามมาตรฐานอะไรบ้าง?

    • ตอบ: ต้องเป็นไปตามมาตรฐาน TIS 384, IEC 60076-1, IEC 60076-5 และมาตรฐานอื่นๆ ที่เกี่ยวข้อง

    • ถาม: หม้อแปลงไฟฟ้าต้องผ่านการทดสอบอะไรบ้าง?

    • ตอบ: ต้องผ่านการทดสอบ Routine test, Type test และ Short-circuit withstand test ตามมาตรฐานที่กำหนด

    • ถาม: ผู้เสนอราคาต้องยื่นเอกสารอะไรบ้างพร้อมกับการเสนอราคา?

    • ตอบ: ต้องยื่นเอกสารตามที่ระบุในหัวข้อ 2 และหน้า 25 ของ TOR

    • ถาม: การทำสีของหม้อแปลงต้องเป็นไปตามมาตรฐานอะไร?

    • ตอบ: ต้องเป็นไปตามมาตรฐาน ISO 12944-5, category C3, system A.3.08

    • ถาม: ฉนวนของหม้อแปลงต้องมีระดับแรงดันเท่าไหร่?

    • ตอบ: เป็นไปตามตารางที่ 5 ใน TOR

    • ถาม: ขั้วต่อสาย HV และ LV ต้องเป็นแบบไหน?

    • ตอบ: เป็นไปตามข้อกำหนดในหัวข้อ 1c.11 ใน TOR

    • ถาม: หม้อแปลงขนาด 50 kVA ถึง 500 kVA ต้องมีระบบ oil preservation แบบไหน?

    • ตอบ: ต้องเป็นแบบ permanently sealed and completely oil filled system (without gas cushion)

    • ถาม: หม้อแปลงขนาด 630 kVA ถึง 2,000 kVA ต้องมีระบบ oil preservation แบบไหน?

    • ตอบ: ต้องเป็นแบบ conservator system type

    • ถาม: การติดตั้ง Security seal ต้องทำอย่างไร?

    • ตอบ: ตามรูปที่ 1 ใน TOR

    • ถาม: Transformer oil ที่ใช้ต้องมีคุณสมบัติอย่างไร?

    • ตอบ: The oil shall be according to IEC 60296, high-quality, clean and dry. The oil shall be free from Polychlorinated biphenyls (PCB).

เอกสารขอบเขตงาน (TOR) ฉบับเต็ม

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS
WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date :16/12/2562
Rev. No. : 0
Form No.
Page 1 of 1
เอกสารเพิ่มเติมแนบท้ายรายละเอียดสเปค
(ADDENDUM)
เอกสารเพิ่มเติมแนบท้ ายรายละเอียดสเปค (ADDENDUM) นี้ให้ถือเป็นส่วนหนึ่งของสเปคอ้างอิงเลขที่ RTRN-035/2561
การทดสอบ Lightning impulse test
ก าหนดรายละเอียดการทดสอบ lightning impulse test เพิ่มเติมในหัวข้อ 1e.2.2 Test procedure of Type test and Short-circuit withstand test ข้ อ (3) แ ล ะ 1e.5 Acceptance test items and acceptance test procedures ดังต่อไปนี้
(1) Test connections
For the lightning impulse test on the LV windings (Um ≤ 1.1 kV), PEA will accept test connections as the following:
CASE 1:
The impulse test sequence is applied to each of line terminals of the tested winding in succession. The other line terminals of the transformer shall be earthed directly or through an impedance, or
CASE 2:
The impulse test is applied to all the LV terminals (including the LV neutral) connected together with the higher voltage terminals earthed.
(2) Test voltage
The standard lightning-impulse voltage and tolerances shall be in accordance with the IEC 60060-1 as the table below:
Description HV LV
Test voltage value 125 kV, peak ±3% (for 22 kV system)
30 kV, peak ±3%
170 kV, peak ±3% (for 33 kV system)
Front time 1.2 µs ±30%
Time to half-value 50 µs ±20%
Relative overshoot magnitude not exceed 10 %
The minimum information on the waveshape in the test report shall consist of test voltage, front time (T1), time to half-value (T2) and overshoot.

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 1 of 32
Invitation to Bid No.:
C Material, equipment, and specifications for THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMSWITH ABILITY TO WITHSTAND SHORT CIRCUIT
C1 General material and packing instructions
Additional to the general instructions, the following shall be observed:
1a Scope
These specifications cover three-phase transformers, oil-immersed, natural self-cooled, power range from 50 kVA to 2,000 kVA, designed and constructed to withstand without damage the thermal and dynamic effects of external short circuits, suitable for outdoor installation on 22 kV and 33 kV 50 Hz distribution systems.
1b Standards
The transformers shall be manufactured and tested in accordance with the following standards:
Thailand Industrial Standard (TIS)
TIS 384: 2543 Power Transformers
International Electrotechnical Commission (IEC)
IEC 60076-1:2011 Power transformers– Part1: General
IEC 60076-2:2011 Power transformers – Part 2: Temperature rise for liquid-immersed transformers
IEC 60076-3:2013 Power transformers – Part 3: Insulation levels, dielectric tests and external clearances in air
IEC 60076-5:2006 Power transformers –Part5: Ability to withstand short circuit
IEC 60296: 2012 Fluids for electrotechnical applications – Unused mineral insulating oils for transformers and switchgear
International Organization for Standardization
ISO 12944-5:2007 Paints and varnishes - Corrosion protection of steel structures by protective paint systems -Part 5: Protective paint systems
LV bushings shall be in accordance with the DIN 42530. HV bushings shall be in accordance with the DIN 42531.
And all other relevant standards, unless otherwise specified in these specifications.
PEA will also accept the transformers and accessories tested in accordance with the later edition of the above standards.
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 2 of 32
PEA will also accept the type test report in accordance with the previous edition of the above standards, if there is no significant change in any test items or no additional test item(s) compared with the above standards. On the other hand, if there is significant change in any test items or there are any additional test items, the previous edition type test report with the additional test report(s) of the significant change test item(s) and/or additional test item(s) will be also accepted.
1c Principal requirement
1c.1 Service conditions and installation
The transformers shall be designed and constructed for outdoor installation and operation under the following conditions:
Altitude : up to 1,000 m above sea level
Ambient air temperature : 50oC, maximum
: 40oC, monthly average, of the hottest month
Relative humidity : up to 94%
Climate condition : tropical climate
Table 1 Transformer installation
Transformer Rating
( kVA )Installation
50 – 250 on concrete pole and on platform
315 – 1,500 on platform and on concrete foundation
2,000 on concrete foundation
1c.2 Oilpreservation system
The transformers of 50 kVA to 500 kVA shall be permanently sealed and completely oil filled system (without gas cushion) type (usually corrugated tank). The transformer tank cover shall be bolt tightened to the tank with suitable gasket sealing.
The transformers of 630 kVA to 2,000 kVA shall be conservator system type.
1c.3 Rating

  1. Rated power
    The rated power, on continuous operation, for transformers shall be as follows:
    50 kVA 250 kVA 500 kVA 1,000 kVA 2,000 kVA
    100 kVA 315 kVA 630 kVA 1,250 kVA
    160 kVA 400 kVA 800 kVA 1,500 kVA

I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 3 of 32
2. Rated voltages
The rated voltage of windings is given in Table 2.
Table 2 Rated voltage
Rated Primary Voltage Rated Secondary Voltage
22 kV, 33 kV 416/240 V
3. Rated frequency: 50 Hz
1c.4 Core and windings
The cores and windings of transformers shall be as follows:
Table 3 Core and windings
Transformer
HV and LV
Construction of Windings
Construction
Rating
Windings shall
of Core
HV winding LV winding
(kVA)
be made of
According to
According to
According to
50-2,000
manufacturer’s
copperonly
manufacturer’s
manufacturer’s
standard
standard
standard
1c.5 Tappings
The primary windings of transformers shall be provided with full capacity of externally-operated off-circuit tap changers.
Tapping range: ±2 x 2.5% of rated primary voltage
The externally-operated off-circuit tap changer shall be designed for de-energized operation with the operating handle brought out through the cover of the tank. The operating handle shall have provision for locking and shall give visual indication of the tapping position without unlocking.
The tap changer shall have a locking device to prevent improper use. The operating handle shall be rotated in clockwise direction from a high tap voltage to a lower tap voltage. The tap changer shall be provided with stops to identify the highest and lowest tap position. The tap changer positions shall be identified by the numbers in sequence. The number “1” shall be designated to the highest tap voltage. Consequently the number “5” indicates the lowest tap voltage. These identifications shall be in perfect correspondence to those indicated in the connection diagram on the nameplate. All five positions of the tap changer shall be operative positions.
The tap positions shall be indelibly marked with weather-proof paint and in a color which shall present distinctive contrast to the surrounding material.
The operating handle of tap changer shall be made from non-corrosion metal. Plastic is not acceptable.I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 4 of 32
1c.6 Connection symbol
50 kVA to 2,000kVA transformers shall have connection symbol Dyn 11.
1c.7 Losses and Short - circuit impedance
The specified or guaranteed losses plus positive tolerance, for each transformer unit shall not be more than the losses are shown in the Table 4.
Short-circuit impedance shall be measured on the principle tapping of 22 or 33 kV at ambient temperature then corrected to 75oC.
Short-circuit impedance of the offered transformers shall be as specified in the Table 4 and have tolerance within +10% except for transformer rating 500 kVA, the short-circuit impedance at 75oC of transformer rating 500 kVA shall be 6.5 or more.
Table 4 Losses and short circuit impedance
Watt Loss (W) Short-circuit
Transformer
Rating
No-load loss, for system voltage of : Load loss
Impedance at 75oC
at 75o
( kVA )
22 kV 33 kV C
(%)
50 110 170 875 4
100 180 260 1450 4
160 260 370 2000 4
250 360 520 2750 4
315 440 630 3250 4
400 520 750 3850 4
500 610 900 4600 6.5 or more
630 680 1050 5600 6
800 800 1150 7000 6
1,000 940 1300 9000 6
1,250 1150 1530 11000 6
1,500 1380 1850 13200 6
2,000 1800 2140 18000 6
1c.8 Limits of temperature-rise, above 50oC ambient temperature
Of top oil : not exceeding 50 K
Of winding : not exceeding 55 K
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 5 of 32
1c.9 Insulation level
The insulation level of HV windings, LV windings and connected parts of transformers shall be as specified in the Table 5:
Table 5 Insulation level
Insulation Level
Nominal System Voltage
Impulse Test Voltage
Power Frequency Test Voltage,
(kV, r.m.s.)
Full-wave (kV, peak)
1-min(kV, r.m.s.)
22 125 50
33 170 70
0.416/0.24 30 10
1c.10 Bushings

  1. Number and location
    Each transformer shall have three (3) high-voltage bushings and four (4) low-voltage bushings located on the cover of the tank.
    Secondary neutral point of transformer shall be brought out by separate-insulated bushing(s) and loaded with rated current.
    The HV bushings shall not be completed with the arcing horns.
  2. Material
    Transformer bushings shall be made of good commercial-grade wet-process porcelain.
    The entire porcelain surface of the bushings that will be exposed after assembly shall be glazed.
    The color of the glaze shall be brown.
  3. Electrical characteristics
    Transformer bushings shall be capable of withstanding the impulse and low-frequency voltage specified in the Table 6:
    Table 6 Electrical characteristics
    Low-frequency, 50 Hz (kV, r.m.s.)
    BushingImpulse Full Wave
    (kV, peak)
    Dry 1-minute Wet 10-second
    High-voltage bushings for
    22 kV system125 50 50
    High-voltage bushings for
    33 kV system170 70 70
    Low-voltage bushings 30 10 10
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 6 of 32
4. Minimum Clearance
Safety clearance of Transformer bushings shall comply with minimum Clearance Criterion,
which measurement between live part to live part or live part to ground shall be as follows.

  • At least 225 mm for 22 kV System
  • At least 320 mm for 33 kV System
  1. Test report
    The bidders have to submit the test report of bushing with the bid in order to confirm the electrical characteristic in Table 6 Electrical characteristics, the bidders who cannot submit will be rejected. The test of bushing can be conducted by manufacturer or third party laboratories.
    1c.11 Terminal connectors
    HV bushings shall be equipped with solderless clamp type connectors for aluminium conductor diameter range from 7.5 mm to 12.6 mm (sizes 35-95 mm2).
    Only for 50 kVA to 1,250 kVA transformers: LV bushings shall be equipped with terminal pad connectors (stud type connectors are preferable), of high conductivity bronze and hot-tin dipped. The terminal pads shall be drilled in accordance with NEMA Standards (9/16” holes on 1 3/4” centers); each hole shall be furnished with one (1) bolt M12 x 60 mm (of at least 50 mm thread length), one (1) nut, two (2) flat washers, and one (1) lock washer; details of terminal pads shall be according to Drawing No. SA4-015/47002. The connectors shall be provided with mounting hardware (bolts, nuts, washers, and lock washers) of stainless steel or better.
    Only for 1,500 kVA to 2,000 kVA transformers: LV bushings shall be equipped with solderless clamp type connectors (stud type connectors are preferable), of high conductivity bronze and hot-tin dipped, for aluminium and copper conductor sizes, and number of circuits take off shall be as Table 7:
    Table 7 Terminal connectors for 1,500 kVA to 2,000 kVA transformers
    Applicable to Aluminium and Copper Conductors Number of
    Transformer Rating
    ( kVA )
    diameter range (mm) sizes (mm Circuits 2)
    1,500 18.4 -29.2 240 -500 4
    2,000 18.4 -29.2 240 -500 6
    The connectors shall be provided with mounting hardware (bolts, nuts, washers, and lock washers) of stainless steel or better. The details of connectors shall be according to Drawing No. SA4-015/47002.
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 7 of 32
1c.12 Tank and Tank finish
Tank and cover shall be constructed of welded steel plate suitable reinforced. The joints between the tank and cover shall be provided with suitable flanges properly bolted together with gaskets.
Tank cover shall have 90° downward bent edges on all sides to protect the gasket under the top cover from direct exposure to weather.
Gaskets between metal surfaces shall be set in grooves or held in position by retainers so arranged that all parts are bolted metal-to-metal. The gaskets shall be made of resilient material which will no deteriorate under the action of hot oil and will remain oil-tight. Gaskets of such material which can be easily damaged by overpressing are not acceptable.
The transformer tank shall be finished with mounting bracket for surge arrester (Surge arrester polymer housing type supplied by PEA) and shall be furnished with three (3) earthing terminal provided for ground leads of surge arrester, see Drawing No. SA4-015/50008.
The bidders have to give the transformer’s tank dimensions which passed type test in 2a Performance data and guarantee of three-phase transformer (Page 29 of 32).
Tolerance of the transformer’s tank dimensions for the purposed transformer shall be within +3 percent of the declared dimensions which given by the bidders in above information, Otherwise shall be rejected.
The distance between tank cover (Top plate) and fins which is installed the earthing terminal for surge arrester shall not less than 200 mm.
The manufacturer’s serial number shall be dented on transformer tank cover.
The manufacture shall prepare 3 mm diameter holes for security seals threading. The first position, the hole shall be drilled at the right last bolt which fix tank and cover of transformer and the second position, the hole shall be drilled at the top right of transformer nameplate as Figure 1.
The security seals will be installed by PEA after any transformers pass the witness test or acceptance test or others depend on PEA’s committee.

I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 8 of 32
Figure 1 Security seal installation
1c.12.1 Painting system

  1. Interior surface
    Interior surface shall be finished oil resistant paint or vanish.
  2. Exterior surface
    The painting system will be suitable for an exterior servicing at medium atmospheric-corrosivity category is as C3, and system number is as A.3.08 in accordance with ISO 12944-5 Table A.3.
    The coating system shall be in accordance with the ISO 12944-5 as following:
  • Primer coat: The number of coats is one (1) or two (2) coats of Epoxy (Misc) Anti-Corrosive Primer, the dry film thickness shall not less than 80 µm.
  • Subsequent coat(s): The number of coats is two (2) to three (3) of Epoxy Intermediate and Polyurethane topcoat with RAL 7036 gray color.
  • The total number of coats is two (2) to four (4) coats and the dry film thickness of coating system shall not less than 160µm.
  1. Dry film thickness test and test report
    The dry film thickness shall be spot checked for each layer of coating. The position of spot checks is specified as Figure 2 for transformers of permanently sealed type, and Figure 3 for transformers of conservator system type.
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 9 of 32

Figure 2 The position of spot checking for transformers of permanently sealed type.
The distance for spot checking of permanently sealed type is as Table 8:
Table 8 Distance for spot checking of permanently sealed type
Symbols Length Symbols Length
a About 1/2 of width (W1) u About 1/2 of height (H1)
b About 1/5 of width (W2) v About 1/2 of height (H3)
c About 2/5 of width (W2) x About 1/4 of height (H2)
d About 3/5 of width (W2) y About 2/4 of height (H2)
e About 4/5 of width (W2) z About 3/4 of height (H2)
f About 1/2 of width (W3)
g About 1/3 of depth (D)
i About 2/3 of depth (D)
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 10of 32

Figure 3 The position for spot checking for transformers of conservator system type.
The distance for spot checking of conservator system type is as Table 9:
Table 9 Distance for spot checking of conservator system type
Symbols Length Symbols Length
a About 1/2 of height (W1) m About 1/5 of depth (D2)
b About 1/6 of height (W2) n About 2/5 of depth (D2)
c About 2/6 of height (W2) o About 3/5 of depth (D2)
d About 3/6 of height (W2) p About 4/5 of depth (D2)
e About 4/6 of height (W2) u About 1/2 of height (H1)
f About 5/6 of height (W2) v About 1/4 of width (H3)
g About 1/2 of height (W3) x About 1/4 of width (H2)
i About 1/5 of depth (D1) y About 2/4 of width (H2)
j About 2/5 of depth (D1) z About 3/4 of width (H2)
k About 3/5 of depth (D1)
l About 4/5 of depth (D1)
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 11of 32
The bidders have to submit the test report, conducted by the acknowledged testing laboratories or manufacture, with the bid. The Item offered without submitting the dry film thickness test report shall be rejected.
The cost of all tests and reports shall be borne by the bidders/manufacturers/contractor.
1c.12.2 Dry film thickness test report
The required information in dry film thickness test report shall be at least the following items:
(1) Transformer information

  1. Manufacturer’s name
  2. Model
  3. Serial number
  4. Number of phase
  5. Rated voltage of the high-voltage winding
  6. Rated voltage of the low-voltage winding
  7. Rated frequency
  8. Rated power
  9. Rated current of the high-voltage winding
    10)Rated current of the low-voltage winding
    (2) Panted information
  10. Coating system (flow coating or spraying)
  11. The information for each coating (Primer coat, Subsequent coat, Top coat) minimum as
    following:
  • Type of material
  • Paint Manufacturer
  • Require minimum dry film thickness (µm) as specified
  • Actual dry film thickness (µm) (3 reading per 1 spot checks)
  1. Technical Data of coats
  2. Painting Procedure
    1c.12.3 Acceptance test procedure of dry film thickness test
    The total dry film thickness of coating shall be measured by contractor for acceptance testing and witness by the PEA’s acceptance committee. Total dry film thickness shall be not less than 160 µm according to ISO 12944-5. PEA will randomly select the samples of transformer only from the first lot. The number of samples and criteria for consideration shall be according to Table 10.
    PEA reserve the right to send representative to inspect and witness test.
    The cost of all tests and reports shall be borne by the manufacturers/contractor.
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 12of 32
1c.13 Marking
PEA’s code number and word “SHORT CIRCUIT WITHSTAND” shall be painted, in orange, on the transformer tank (for transformer having no conservator) or on the conservator tank (for transformer having conservator) at the position that enables a clear observation, and also be legibly and durably inscribed on the metal part of nameplate. The code number and dimensions of each letter to be marked shall be given by PEA after the final of bid consideration.
1c.14 Accessories
The 50 kVA to 2,000 kVA transformers shall be furnished and equipped with the following accessories: 1. HV and LV bushings, with terminal connectors
2. Bird guard cap (bushing cover), ultra-violet and track resistant material, e.g. polypropylene, neoprene, etc; which is suitable for exposure to sunlight
3. Earthing terminal for surge arrester, with solderless clamp type connector suitable for flexible copper insulated ground lead size 16 mm2, 430 mm long. (See Drawing No.SA4-015/50008)
4. Tap changer
5. Thermometer pocket, transformers shall have a thermometer pocket to allow the measuring of the top-oil temperature. This pocket shall be placed as shown in the EN 50216-4 (type A1). The pocket shall be provided with a corrosion-proof cap. The thread shall be protected with silicone grease. Dimensions of the thermometer pocket in mm are shown as Figure 4.

Figure 4 Dimensions of thermometer pockets
6. Nameplate with connection diagram
7. Oil drain valve with plug or cap, installed at the lower part of the tank
8. Sludge drain plug, installed at the bottom of the tank
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 13of 32
9. Earthing terminal, with solderless clamp type connector suitable for steel stranded conductor diameter of 9.0 mm (size 50 mm2); complete with lockwasher of stainless steel or better.
10. Lifting lugs
11. Lifting eyes on the cover
12. Oil level gauge
13. Compression type cable lug, for aluminium conductor diameter of 7.5-9.0 mm (sizes 35-50 mm2), suitable for connecting between HV bushing and surge arrester lead conductor.
14. Only for 50 kVA to 250 kVA transformers: Pressure relief valve on the tank cover, oil filling plug on the tank cover, and supporting lugs for hanging the transformer tank to pole by using two (2) M16 machine bolts.
The lugs shall have 600 mm spacing; 500 mm or 400 mm spacing may be used when tank height will not permit the 600 mm dimension. (See Drawing No. SA4-015/50008)
Only for 315 to 500 kVA transformers: Pressure relief valve on the tank cover, and oil filling plug on the tank cover.
Only for 630 kVA to 2,000 kVA transformers: Pressure relief valve on the tank cover, oil conservator with dehydrating breather and oil level gauge. The cylinder of dehydrating breather shall be of transparent glass. The dehydrating breather shall be easy replaced and filled with silica-gel not less than 1.0 kg.
15. Only for 315 kVA to 2,000 kVA transformers: Transport rollers
16. Only for 1,000 kVA to 2,000 kVA transformers:
(a) Dial type thermometer with adjustable contact(s)
(b) Double float Buchholz relay having two (2) contacts (for alarm and tripping)
17. Other necessary accessories according to manufacturer’s design.
1c.15 Initial oil filling
The transformers shall be supplied with initial oil filling. The oil shall be according to IEC 60296, high-quality, clean and dry.
The oil shall be free from Polychlorinated biphenyls (PCB).
1c.16 Nameplate
The following minimum nameplate information shall be legibly and durably inscribed on the metal part of nameplate:
(1) Manufacturer’s name
(2) Manufacturer’s serial number
(3) Year of manufacture
(4) PEA’s code number
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 14of 32
(5) Contract number and/or PO number
(6) Number of phases
(7) Rated frequency in Hz
(8) Rated power in kVA
(9) Rated voltage in V
(10) Rated current in A
(11) Rated secondary short-circuit withstand current in kA r.m.s.
(12) Tapping voltages in V
(13) Connection symbol
(14) Short-circuit impedance in %
(15) Connection diagram
(16) Type of cooling
(17) Oil quantity in liters
(18) Drain oil quantity in liters (for permanently sealed type)
(19) Total weight in kg
(20) Wording “SHORT CIRCUIT WITHSTAND”
(21) Material of HV and LV winding such as copper winding, cooper foil etc.
1c.17 Bushing location and terminal markings
Bushing shall locate as shown in the figures below:
Low-Voltage Side
a b c n
A B C
High-Voltage Side
Figure 5 50-250 kVA Tank top view
Low-Voltage Side
n c b a
C B A
High-Voltage Side
Figure 6 315 -2,000 kVA Tank top view
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 15of 32
The letters A, B, C, a, b, c, and n shall be durable marked on transformer tank beside bushings consequently. The height of the symbols shall not less than 30 mm.
Mark by sticker is not accepted.
1c.18 Mass
For 50 kVA to 160 kVA transformers: Mass of complete transformer with oil and accessories shall not be more than 1,000 kg.
For 250 kVA transformers: Mass of complete transformer with oil and accessories shall not be more than 1,200 kg.
Tolerance of the mass of proposed complete transformers with oil shall be within + 5 percent of the declared mass of transformer which passed type test given by the bidders in 2a Performance data and guarantee of three-phase transformer (Page 28 of 32) but the maximum mass shall not exceed the above allowable mass.
If the mass of complete transformers with oil more than +5 percent of the declared mass or exceed the above allowable mass, the transformers shall be rejected.
1d Packing
For transformers manufactured outside the territories of Thailand, each transformer shall be seaworthy packed in individual export crate or wooden case which will not be returned.
For transformers manufactured within the territories of Thailand, each transformer shall be packed in individual crate or wooden case which will not be returned.
Only for 50 kVA to 160 kVA transformers for 22 kV systems and 50 kVA to 100 kVA transformers for 33 kV systems, each crate or wooden case shall be strong enough for stacking over with at least another one.
If the crate or wooden case is made of rubber wood (Yang-para), the wooden parts shall be treated with wood preservative.
The details of wood treatment shall be described.
1e Tests and test reports
1e.1 Routine test
Each transformer shall pass the manufacturer’s standard routine tests, and also pass the following tests in accordance with the relevant standards:
(1) Measurement of winding resistance (IEC 60076-1)
(2) Measurement of voltage ratio and check of phase displacement (IEC 60076-1)
(3) Measurement of short-circuit impedance and load loss (IEC 60076-1)
(4) Measurement of no-load loss and current (IEC 60076-1)
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 16of 32
(5) Applied voltage test (IEC 60076-1 and IEC60076-3)
(6) Induced voltage withstand test (IEC 60076-1 and IEC60076-3)
The Item offered without submitting the list of routine test report shall be rejected.
1e.2 Type test and Short-circuit withstand test
For transformers rating of 50 kVA to 250 kVA and the reference transformers
For transformers rating of 50 kVA to 250 kVA and the reference transformers, these transformers shall be passed all items of type test and short circuit withstand test according to 1e.2.2 Test procedure of Type test and Short-circuit withstand test. The test result shall be included in one (1) test report. The test report shall be issued or approved by the same acknowledged independent testing laboratory according to 1e.3 Acknowledged independent testing laboratories, otherwise will be rejected.
For the others rating which are not the reference transformers
The transformers shall be passed the following type tests in accordance with the relevant standards: (1) Temperature-rise test (IEC 60076-2)
(2) Full wave lightning impulse test (IEC 60076-1 and IEC 60076-3)
(3) Measurement of no-load loss and current at 90 % and 110 % of rated voltage (IEC 60076-1) Type test shall be made on only one (1) unit of each rating. The test result shall be included in one (1) test report. The test report shall be issued or approved by the same acknowledged independent testing laboratory according to 1e.3 Acknowledged independent testing laboratories, otherwise will be rejected.
1e.2.1 Short-circuit withstand test
The transformers shall be designed and constructed to withstand without damage by the thermal and dynamic effects of the external short circuit in accordance with the IEC 60076-5.
The duration of the current I to be used for the calculation of the thermal ability to withstand short circuit shall be 2 s and the initial temperature for calculation shall be 105oC.
Test procedure of short-circuit withstand test shall be according to 1e.2.2 Test procedure of Type test and Short-circuit withstand test.
The total number of tests shall be nine made in a different position of the tap-changer according to IEC 60076-5. The duration of each test shall be 0.5 s
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 17of 32
1e.2.2 Test procedure of Type test and Short-circuit withstand test
Each transformer, as delineated by its own unique serial number, is required to pass a complete type test and short-circuit withstand test following the procedures listed below:
(1) Prior to short circuit testing, each individual transformer must pass the routine test, measurement of no-load loss and current at 90 % and 110 % of rated voltage and temperature-rise tests. Criteria for the temperature-rise test is presented in 1c.8 “Limits of temperature-rise"
(2) Upon successfully passing the temperature-rise test, each transformer must then successfully pass a short circuit withstand test
(3) Finally, lightning impulse shall be tested and all the routine tests including measurement of no load loss and current at 90 % and 110 % of rated voltage shall be repeated. Each transformer shall pass the routine test, measurement of no-load loss and current at 90 % and 110 % of rated voltage and lightning impulse test.
The impulse test sequence is applied to each of line terminal of the tested winding in succession. The other line terminals of the transformer shall be earthed directly or through an impedance.
If the laboratories intend to use PEA’s power system as power supply for the short-circuit withstand testing, the transformer’s manufacturer or the laboratories shall submit technical documents of the test such as test procedure, test circuit diagram, test and protection equipment, testing date and calculation of voltage drop in PEA’s power system caused by the test to PEA for consideration and approval before the tests are proceeded.
It is responsible of the laboratories to compensate all failure or damage occurred to PEA’s power system caused by the test.
PEA reserves the right to send representatives to witness the test.
The cost of all tests and reports shall be borne by the bidders/manufacturers/contractor.
1e.2.3 Type test and short circuit test report
For 50 to 250 kVA transformers, the bidders have to submit the type test and short circuit test report of the identical transformer (purchased transformer) with the bid, otherwise shall be rejected
For transformers which rated power more than 250 kVA, the bidders have to submit the following document with the bid, otherwise shall be rejected.
(1) The type test report of the identical transformer (purchased transformer), and
(2) The short circuit test report of identical transformer (purchased transformer) or the reference transformer according to 1e.2.2 Test procedure of Type test and Short-circuit withstand test, and
(3) The calculation report(1) and others information according to APPENDIX 1.
Note
(1) In case of the bidders submit the short circuit test report of the reference transformer, calculation report and others information shall be submitted.
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 18of 32
The type test and short-circuit withstand test report of the transformers which are conducted or inspected by Thailand’s national laboratories/institutes shall be valid within five (5) years count from the issued date in the test reports to the bid closing date.
For the type test and short-circuit withstand test report of the transformers which are conducted or inspected by laboratories/institutes, with in other countries shall be valid within ten (10) years count from the issued date in the test reports to the bid closing date.
PEA will also accept other documents instead of the type test and short-circuit withstand test reports in the following conditions:
(1) In case the proposed transformer has been supplied to PEA and get the order from PEA’s Procurement Department or Substation Work Department or Transmission and Distribution System Work Department (from PEA’s head office), the Purchase Order (PO) or Contact with List of suppliers or Proposal form can be submitted, or
(2) In case the proposed transformer has been registered for PEA Product Acceptance, the not-expired registration certificate counted to the bid closing date can be submitted, or
(3) In case the proposed transformer has been registered for Product lists for substation turnkey project, the not-expired registration certificate counted to the bid closing date can be submitted instead
However the document in case (1), (2) and (3) shall be proved that the transformer specified in the PO or Contract with List of suppliers or Proposal form or registration certificate shall be the same product, type/model and all ratings as the proposed transformer for this bid.
The cost of all tests and reports shall be borne by the bidders/manufacturers/contractor.
1e.3 Acknowledged independent testing laboratories
The type test and short-circuit withstand test shall be conducted or inspected by the acknowledged testing laboratories/institutes as follows:
(1) Laboratories/institutes which are members of the Short-circuit Testing Liaison (STL) or independent laboratories/institutes which are accredited according to TIS 17025 or ISO/IEC 17025 with the scope of accreditation covered the relevant test items, standards and equipment. The certification and scope of accreditation of the independent laboratories/institutes shall be submitted with the bid for consideration.
The bidders or manufacturers who are accredited according to TIS 17025 or ISO/IEC 17025 preferring to carry out the type tests and short-circuit withstand test of the transformers with the laboratories or by the manufacturers themselves, the tests shall be inspected by Thailand’s
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 19of 32
national laboratories, institutes, universities and electric utilities in (2) and other laboratories, institutes, universities or electric utilities approved by PEA.
(2) Thailand’s national laboratories, institutes, universities and electric utilities, as follow:

  • Electricity Generating Authority of Thailand (EGAT)
    (3) Other laboratories, institutes, universities or electric utilities approved by PEA. In this case, the detail of the test facilities of the laboratories shall be submitted to PEA for approval before proceeding the tests and before the bid closing date. PEA reserves the right to send representatives to inspect and witness the tests with the cost of the bidders or manufacturers.
    1e.4 The information in the Test report
    The minimum information of the transformer in the type test and short-circuit withstand test report shall be the following items:
  1. Transformer information
    (1) Manufacturer’s name
    (2) Model
    (3) Manufacturer’s serial number
    (4) Number of phase
    (5) Rated voltage of the high-voltage winding
    (6) Rated voltage of the low-voltage winding
    (7) Rated voltage ratio
    (8) Rated frequency
    (9) Rated power
    (10) Rated current of the high-voltage winding
    (11) Rated current of the low-voltage winding
    (12) Short-circuit impedance at 75°C
    (13) Connection symbol
    (14) Cooling method
    (15) Total mass
    (16) Mass of core and winding
    (17) Oil quantity
    (18) Highest voltage for equipment applicable the high-voltage winding
    (19) Highest voltage for equipment applicable the low-voltage winding
    (20) Rated insulation level
    (21) Type of construction
    (22) High-voltage winding type and material
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 20of 32
(23) Low-voltage winding type and material
(24) Cross-section of the conductor in the high-voltage winding
(25) Cross-section of the conductor in the low-voltage winding
(26) Number of strands per turn of high voltage winding
(27) Number of strands per turn of low voltage winding
(28) Number of strands radially across the layer (for all turns) of high voltage winding
(29) Number of strands radially across the layer (for all turns) of low voltage winding
(30) Total number of turns per phase
(31) Number of turns each tap
2. Drawing
(1) Overall dimensions of transformer
(2) Tank dimension
(3) Drawing of cross section area of core
(4) Drawing of active part
(5) Drawing which show the core and coil information according to Figure 7

Figure 7: Core and coil constructions.
3. Photograph of transformers
The color photograph which reveal transformer construction for out-of-tank inspection before and after short-circuit withstand test shall be in the short-circuit withstand test report.
In case the information in the reports are not completed according to the above requirement, the bidders will be rejected.
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 21of 32
1e.5 Acceptance test items and acceptance test procedures
1e.5.1 Acceptance test items
The sample of transformers shall pass the following tests in accordance with the IEC 60076 and IEC 60156 standards:
(1) Measurement of winding resistance (IEC 60076-1)
(2) Measurement of voltage ratio and check of phase displacement (IEC 60076-1)
(3) Measurement of short-circuit impedance and load loss (IEC 60076-1)
(4) Measurement of no-load loss and current (IEC 60076-1)
(5) Applied voltage test (IEC 60076-1 and IEC60076-3)
(6) Induced voltage withstand test (IEC 60076-1 and IEC60076-3)
(7) Oil Dielectric Breakdown voltage test (IEC 60156)
(8) Temperature-rise test (IEC 60076-2)(1)
(9) Full wave lightning impulse test (IEC 60076-3)(1)
(10) Short-circuit withstand test (IEC 60076-5)(2) (only for transformer rating of 50-250 kVA)
(11) Dry film thickness test, the dry film thickness test procedure shall be according to 1c.12.1 Painting system
Note
(1) The Items (8) and (9) shall be tested on one (1) unit for each contract at the PEA laboratory or Acknowledged independent laboratories approved by PEA as specified in 1e.3 Acknowledged independent testing laboratories or manufacturer laboratories depending on PEA’s acceptance committee
(2) The Items (10) shall be tested on one (1) unit for each contract at Acknowledged Independent laboratories depend on PEA’s acceptance committee approved by PEA as specified in 1e.3 Acknowledged independent testing laboratories.
Any transformers which are out-of-tank for inspection in short-circuit withstand test, the insulating oil shall be dehydration at manufacture’s factory and oil dielectric breakdown voltage shall be retested. The report of oil dielectric breakdown voltage test shall be submitted to PEA before shipment/delivery, for each ordered transformer.
1e.5.2 Acceptance test procedures
PEA’s acceptance committee will select the sample of each lot, the number of transformer per lot according to Table 10. All sampling units shall be transported to PEA laboratory or Acknowledged independent laboratories for testing according to 1e.5.1 Acceptance test items. The transportation shall be carried out by the contractor.
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 22of 32
Table 10 The number of sample and criteria for consideration
Sample size of transformers
Maximum number of sample
Number of transformer
for acceptance test
failing in the acceptance test
per lot (Unit)
(Unit)
(Unit)
2 to 15 2 0
16 to 25 3 0
26 to 90 5 0
91 to 150 8 0
151 to 500 13 1
More than 500 20 1
The number of failing units shall not more than the maximum number of failing sample in the acceptance test according to Table 10. Otherwise, the transformers in that lot shall be rejected.
In case the failing units are not more than the maximum number of failing sample in the acceptance test according to Table 10, the contractor has to take responsibility as following procedure.
(1) The contractor has to recheck all delivered transformers in that lot and repair or fix the defective transformers in that lot.
(2) The contractor shall analyze the problem and send the report to PEA’s acceptance committee before the lot accepted.
(3) The transformers which are repaired or fixed in that lot shall be retested only in the relevant test items according to 1e.5.1 Acceptance test items.
After the test, the transformers shall be rebuilt completely by the contractor with free of charge and send back to PEA with the same amount of the samples.
1f Inspection
To ensure about the quality of transformers, the inspection shall be carried out by the PEA’s representative (PEA’s witness committee) at following two stages:

  • At anytime during receipt of raw material and manufacture/ assembly whenever the PEA desires. - At finished stage i.e. transformers are fully assembled and are ready for dispatch.
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 23of 32
C2 Material and packing data to be given by bidders
The bidders have to submit the following data and details of transformers and accessories with the bid: 2a Performance data and guarantee of three-phase transformers. (See pages 26 to 30 of 32)
2b Drawing of inside tank and overall transformer with dimensions in mm showing of particulars of normal construction details.
2c Drawings, with dimensions in mm, of the following accessories:

  1. HV and LV bushings
  2. Terminal connectors, on HV and LV bushings, with description of materials used for the component parts
  3. Nameplate with connection diagram
  4. Valve, showing the internal construction
  5. Earthing terminal connector
  6. Dehydrating breather, and details of coupling (if any)
  7. Bracket for surge arrester
  8. Earthing terminal for surge arrester
  9. Lifting lug
  10. Lifting eye
  11. Pressure relief valve
  12. Thermometer pocket
  13. Oil level gauge
  14. Oil filling plug
  15. Supporting lugs
  16. Compression type of cable lug
  17. Sludge drain plug
  18. Accessories according to manufacturer’s design, if any
    2d Catalogues and/or drawings with details of the following accessories:
  19. Dial type thermometer
  20. Double float Buchholz relay
  21. Pressure-relief valve
  22. Bird guard
  23. Core
  24. HV and LV Winding
  25. Off load tap changer
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 24of 32
8. Insulation paper
9. Gaskets
10. Oil drain vale
11. Accessories according to manufacturer’s design, if any
2e Dry film thickness test report
2f Type test and Short-circuit withstand test report
2g List of routine test
2h Drawing of core and coil construction
2i Specifications of transformer oil and test report
2j HV and LV Bushing test report
2k Others necessary information in order to show that the special test report can prove the performance of the proposed transformers.
2l Bidders shall propose and quote for recommended spare part list with separate price for each offered item (e.g., bushings)
2m Packing details
Packing method (shown by drawing(s), and describe packing materials)
Number of transformers in one (1) crate or wooden case (one)
Overall dimensions (L x W x H) of each crate or wooden case in cm
Volume of each crate or wooden case in m3
Gross weight of each crate or wooden case in kg
Number of crates or wooden cases
2n Critical documents of the transformers (See page 25 of 32)
The lists of documents shall be fulfilled and submitted with the bid.
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 25of 32
The Critical documents of the transformers
No. Required documents Proposed technical
Reference document
document
(Page/Item)
1 HV and LV Bushing test report □ Yes □ No
2 Dry film thickness test report □ Yes □ No
3 List of routine test report □ Yes □ No
4 For 50-250 kVA and the reference transformer
□ Yes □ No
Type test and Short-circuit withstand test report
For transformer more than 250 kVA and is not
the reference transformer
Type test report and calculation report and
accessories information, or
The copy of previous Purchase Order (PO) or
□ Yes □ No
Contract with List of suppliers or Proposal form,
or
PEA Product Acceptance registration certificate,
□ Yes □ No
or
Product lists registration certificate □ Yes □ No
5 The TIS 17025 or ISO/IEC 17025 certification
□ Yes □ No
and scope of accreditation of the independent
laboratories/institutes (in case the independent
laboratories/institutes are accredited according to
TIS 17025 or ISO/IEC 17025)
6 Performance data and guarantee of the three
□ Yes □ No
phase transformers.
(pages 26 to 30 of 32)
7 Drawing of inside tank and overall transformer
□ Yes □ No
with dimensions in mm showing of particulars
of normal construction details.
8 Drawings, with dimensions in mm according to
□ Yes □ No
2c
9 Catalogues and/or drawings with details
□ Yes □ No
according to 2d
10 Drawing of core and coil construction according
□ Yes □ No
to 2h
11 Specifications of transformer oil and test report
□ Yes □ No
according to 2i
12 Packing detail(s) according to 2m □ Yes □ No
The items offered without submitting the critical documents shall be rejected
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 26of 32
Invitation to Bid No.:
2a Performance data and guarantee of three-phase transformers
Item ………………….
Manufacturer’s name and country of origin
Type or model
Applied standard
Rated power kVA
Rated frequency Hz
Rated primary voltage
V
Rated secondary voltage
V
Connection symbol Dyn11
Type of oil preservation system -
Operation duty: continuous operation (Type DB) Yes/No
Max. temperature rise of winding (at full load)
K
Max. temperature rise of top oil (at full load)
K
Primary tapping: off-circuit condition
Yes/No
Number of steps of primary tapping
Steps
Per cent of rated voltage of each tapping
%
No-load current & Tolerance % & % &
Short-circuit impedance at 75oC & Tolerance % & % &
Losses, for each transformer unit
W
No-load loss plus positive tolerance
W
Load loss, plus positive tolerance, at 75oC
Efficiency in %, at 75oC and at load:

  • 1/2 of rated power and P.F. = 1.0
    %
  • 1 of rated power and P.F. = 1.0
    %
    Voltage regulation at P.F. = 1.0 %
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 27of 32
Item ………………
Bushings HV LV - Manufacturer’s name

  • Country of origin
  • Applied standard
  • Rated current
    A
    -Full-wave impulse withstand voltage, or BIL
    kV, peak
  • Low-frequency dry 1-minute test voltage
    kV, r.m.s.
  • Low-frequency wet 10-second test voltage
    kV, r.m.s.
    -Protection class
  • Colour of glazing

-Stud thread size, Metric

Secondary neutral point is loaded with rated current Yes/No
Terminal connectors on HV and LV bushings

  • Manufacturer’s name
    mm
    -For copper conductor diameter range (HV side)
    mm
    -For aluminium conductor diameter range
    (HV side)
    mm
    -For copper conductor diameter range (LV side)
    mm
    -For aluminium conductor diameter range
    (LV side)
    Circuits
  • Number of circuits, take-off (LV side)
    Yes/No
  • Terminal pads are according to PEA’s Drawing No.
    SA4-015/47002
    Winding HV LV - Manufacturer’s name (the biddershave to quote not

more than three (3) manufacturers)

  • Country of origin
  • Material: copper
    Yes/No
  • Type of enamel or insulating material of wire

-Size of wire

  • for HV side (diameter)
    mm
  • for LV side (dimension)
    mm x mm
  • Resistance per phase at 75oC
    Ohm
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 28of 32
Item ………………
-Full-wave impulse withstand voltage, or BIL
kV, peak
-Power-frequency test voltage, 1 min
kV, r.m.s.

  • Construction of winding
  • Current density
    A/mm2
  • Number of layer per coil
  • Number of turns of each coil in tap No.3
    Turns
  • Number of turns of each tapping position
    Turns
  • Total turns of each coil
    Turns
    Core
  • Manufacturer’s name (the bidders have to quote not
    more than three (3) manufacturers)
  • Country of origin
    Pressure relief valve
  • Manufacturer’s name
  • Country of origin
  • Type or model
    kg/cm2
  • Operating pressure
    cc/sec
    -Flow rate at…… kg/cm2
    Method of cooling -
    Total cooling surface m2
    Brand of oil used for initial filling -
    kg/cm2
    Completely assembled transformer shall withstand,
    without permanent deformation, a maximum
    pressure of
    Colour of tank: grey (RAL 7036)
    Yes/No
    Tank finish conforms to PEA’s requirement
    Yes/No
    Quantity of oil filling
    liters
    Mass of core
    kg
    Mass of winding
    kg
    Mass of the part liftable from tank
    kg
    Mass of complete transformer with oil
    kg
    Terminal markings and connections conform to PEA’s
    Yes/No
    requirement
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 29of 32
Item ………………
Tank
mm

  • Thickness of side wall
    mm
  • Thickness of top plate
    mm
  • Thickness of bottom plate
    Internal dimensions
    mm
  • Height
    mm
  • Width
    mm
  • Depth
    Dimensions of transformer
    mm
    Overall height
    mm
    Overall width
    mm
    Overall depth
    mm
    Height over cover
    Total dry film thickness µm
    Fin
    mm
    -Fin radiators or Corrugated thickness
    mm
  • Dimension of each fin (LxBxT)
    Number of Fins per radiator

-Side of tank

-Front of tank

  • Total number of fin
    Bushing clearance
    mm
    Please fill in the shortest of clearance
    mm
    LV to earth
    mm
    HV to earth
    mm
    Between LV bushing
    mm
    Between HV bushing
    Detail documents of Item 1 on Page 31 to 32 of 32 shall be sent
    Yes/No
    to PEA before shipment/delivery
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 30of 32
Item ………………
X/R ratio -
Rated short circuit current and withstanding
duration
kA

  • Current
    s
  • Duration
    Duration of overload
    Minutes
    -25% overload
    Minutes
    -50% overload
    Magnetic flux density Tesla
    Other :
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 31of 32
Note: Conditions for documentation and consideration

  1. The Contractor has to supply the following documents in English and/or Thai, before shipment/delivery, for each ordered transformer:
    1.1 Report of routine tests
    1.2 Number of turns of each winding, each coil, and each tapping position
    1.3 Mass of HV windings and of LV windings
    1.4 Type of enamel, temperature class, and size of the enameled wire
    1.5 Information for Reference (only one(1) unit per contract). The following information for each transformer shall be submitted for maintenance purpose.
  • Coil height for each winding before assembly and after complete assembly.
  • Torque value on clamping bolts or pressure for each winding before assembly and after
    complete assembly.
  • Photograph of each coil for each phase and photograph of core and coils assembly. The
    photograph of each coil shall be taken from the final production process before placing
    to the core, top view and front view shall be provided. The photograph of core and coils
    assembly shall be taken just prior to place the completed core and coils assembly into
    the tank, top view, front view, right view, left view and rear view shall be provided for
    complete set of photographs. All photographs shall be 216 mm (8-1/2 in) by 280 mm
    (11 in) gloss prints properly labeled relevant to the view taken.
    1.6 Invoice and Test report of the following material and accessories used in each supply shall be submitted.
  • Transformer oil
  • Silicon steel
  • Copper conductor
  • Insulation paper and pressboard
  • Pressure relief
  • Gaskets
  • Bushing
  • Transformer supervisory equipment
    I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
THREE-PHASE TRANSFORMERS FOR 22 kV AND 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Specification No. RTRN-035/2561
Approved date : 30/05/2562
Rev. No. : 5
Form No. 02-3S
Page 32of 32
The above documents shall be sent to the following address:
Transformer Division
Provincial Electricity Authority
200 Ngam Wong Wan Road, Chatuchak
Bangkok Metropolis 10900
Thailand
2. If the material and packing data given by bidders, which are mentioned on Pages 23 to 24 of 32 are estimated or approximated, the bid may be rejected.
3. Delivery time is also one of the important factors to be considered.
4. Partial shipment/delivery is allowed.
I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
Specification No. RTRN-035/2561: THREE-PHASE TRANSFORMERS FOR 22 kV and 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Page 1 of 3
C3 Schedule of detailed requirement
Item
PEA
Material
No.
Quantity
Description
1
2
3
4
5
6
7
8
9
10
1050010066
1050010067
1050010068
1050010069
1050010070
1050010071
1050010072
1050010073
1050010074
1050010075
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
50 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
100 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
160 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
250 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
315 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
400 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
500 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
630 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.
800 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.
1,000 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.

I
PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
Specification No. RTRN-035/2561: THREE-PHASE TRANSFORMERS FOR 22 kV and 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Page 2 of 3
C3 Schedule of detailed requirement
Item
PEA
Material
No.
Quantity
Description
11
12
13
14
15
16
17
18
19
20
1050010076
1050010077
1050010078
1050010138
1050010139
1050010140
1050010141
1050010142
1050010143
1050010144
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
1,250 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.
1,500 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.
2,000 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.
50 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
100 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
160 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
250 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
315 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
400 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
500 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.

I
PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
Specification No. RTRN-035/2561: THREE-PHASE TRANSFORMERS FOR 22 kV and 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Page 3 of 3
C3 Schedule of detailed requirement
Item
PEA
Material
No.
Quantity
Description
21
22
23
24
25
26
1050010145
1050010146
1050010147
1050010148
1050010149
1050010150
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)
630 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.
800 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.
1,000 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.
1,250 kVA, three-phase transformer, conservator system type, withstand short circuit,33,000-416/240V, symbol Dyn11.
1,500 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.
2,000 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.
Note : Enclosed Drawings No. SA4-015/47002 and No. SA4-015/50008

I

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
Specification No. RTRN-035/2561: THREE-PHASE TRANSFORMERS FOR 22 kV and 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Page 1 of 5
C4 Price schedule
Invitation to Bid No.:
Manufacturer :
Country of origin :
Trade-mark :
Item
PEA
Material
No.
Catalogue No.
Description
Quantity
Unit Cost
(See details
& conditions
attached)
Total Cost
(See details
& conditions
attached)
1
2
3
4
5
1050010066 1050010067 1050010068 1050010069
1050010070I

50 kVA, three-phase transformer, permanently sealed and completely oil filled  system (without gas cushion) type, withstand short-circuit, 22,000-416/240V,  symbol Dyn11.

100 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
160 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
250 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
315 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
set(s)
set(s)
set(s)
set(s)
set(s)

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
Specification No. RTRN-035/2561: THREE-PHASE TRANSFORMERS FOR 22 kV and 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Page 2 of 5
C4 Price schedule
Invitation to Bid No.:
Manufacturer :
Country of origin :
Trade-mark :
Item
PEA
Material
No.
Catalogue No.
Description
Quantity
Unit Cost
(See details
& conditions
attached)
Total Cost
(See details
& conditions
attached)
6
7
8
9
10
11
1050010071 1050010072
1050010073 1050010074 1050010075
1050010076I

400 kVA, three-phase transformer, permanently sealed and completely oil filled  system (without gas cushion) type, withstand short-circuit, 22,000-416/240V,  symbol Dyn11.

500 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 22,000-416/240V, symbol Dyn11.
630 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.
800 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.
1,000 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.
1,250 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.
set(s)
set(s)
set(s)
set(s)
set(s)
set(s)

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
Specification No. RTRN-035/2561: THREE-PHASE TRANSFORMERS FOR 22 kV and 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Page 3 of 5
C4 Price schedule
Invitation to Bid No.:
Manufacturer :
Country of origin :
Trade-mark :
Item
PEA
Material
No.
Catalogue No.
Description
Quantity
Unit Cost
(See details
& conditions
attached)
Total Cost
(See details
& conditions
attached)
12
13
14
15
16
1050010077 1050010078 1050010138
1050010139 1050010140I

1,500 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.

2,000 kVA, three-phase transformer, conservator system type, withstand short circuit, 22,000-416/240V, symbol Dyn11.
50 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
100 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
160 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
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PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
Specification No. RTRN-035/2561: THREE-PHASE TRANSFORMERS FOR 22 kV and 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Page 4 of 5
C4 Price schedule
Invitation to Bid No.:
Manufacturer :
Country of origin :
Trade-mark :
Item
PEA
Material
No.
Catalogue No.
Description
Quantity
Unit Cost
(See details
& conditions
attached)
Total Cost
(See details
& conditions
attached)
17
18
19
20
21
1050010141 1050010142 1050010143
1050010144
1050010145I

250 kVA, three-phase transformer, permanently sealed and completely oil filled  system (without gas cushion) type, withstand short-circuit, 33,000-416/240V,  symbol Dyn11.

315 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
400 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
500 kVA, three-phase transformer, permanently sealed and completely oil filled system (without gas cushion) type, withstand short-circuit, 33,000-416/240V, symbol Dyn11.
630 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.
set(s)
set(s)
set(s)
set(s)
set(s)

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
Specification No. RTRN-035/2561: THREE-PHASE TRANSFORMERS FOR 22 kV and 33 kV 50 Hz DISTRIBUTION SYSTEMS WITH ABILITY TO WITHSTAND SHORT CIRCUIT
Page 5 of 5
C4 Price schedule
Invitation to Bid No.:
Manufacturer :
Country of origin :
Trade-mark :
Item
PEA
Material
No.
Catalogue No.
Description
Quantity
Unit Cost
(See details
& conditions
attached)
Total Cost
(See details
& conditions
attached)
22
23
24
25
26
1050010146 1050010147 1050010148 1050010149 1050010150
I

800 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.

1,000 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.
1,250 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.
1,500 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.
2,000 kVA, three-phase transformer, conservator system type, withstand short circuit, 33,000-416/240V, symbol Dyn11.
set(s)
set(s)
set(s)
set(s)
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