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1. Production Capacity
5) Manpower for Transformer factory
- 55 Engineers
- 340 Skilled Workers
1) Annual Production Capacity : 28,000MVA
2) Maximum Capacity : up to 800MVA(3 phase)
3) Maximum Voltage : up to 765kV, 2050 BIL
4) Factory Space : 16,800m²

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2. Production Range
1) Power Transformer
2) Distribution Transformer
3) Cast resin Transformer
4) Special Purpose Transformer
Rectifier Transformer
Furnace Transformer
Dry type Transformer
Shunt Reactor
Mobile Transformer

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3. Quality Assurance (ISO 9001)
1) Original Date of Issue : July of 1989
2) Registered Parts of Quality Assurance
Transformer Design and Development
Production and Testing
Installation and Service

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4. Applicable Standard
1) IEC 76 (For Europe and Asia)
2) ANSI C57.12.00 (For America)
3) CAN/CSA-C88-M90 (For Canada)
4) AS 2374 (For Australia)
5) ES 140 (For Korea)

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Specification of Transformer
5. Short Circuit Test
1) Major Performance Record of Short Circuit Test
No. Test Date
Test of
Tap Change Customer
1
2
3
4
5
Generating Transformer
3PH 6/64/85/106/119MVA 230/14.8kV YNd1
Power Transformer
3PH 45/60MVA 154/23kV Ynyno(d)
Power Transformer
3PH 35/44MVA 154/23kV YNd1
Distribution Transformer
3PH 10MVA 22/6.6kV Ynynod(d)
Power Transformer
3PH 20/26MVA 132/11.5kV Dyn11
Sept. 1995
Nov. 1989
Nov. 1986
Dec. 1986
Dec. 1986
N.L.T.C
O.L.T.C
O.L.T.C
O.L.T.C
O.L.T.C
PUD in USA
KEPCO in Korea
In-Chon Iron &
Steel in Korea
PUB in Singapore
WAPDA in Parkistan

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5. Short Circuit Test
2) Detailed Explanation for the Short Circuit Test Performed to the
230kV Transformers for Rocky Reach Project
 Customer : Public Utility District No.1 of Chelan County in U.S.A
 Project : Replacement for Rocky Reach Dam Transformer
 Transformer Rating
3phase 60Hz 119MVA 14.8/230kV Step-up Transformer
Basic Impulse Level on H.V Side : 900kV
Standard : ANSI C57.12.00
 Tested and Certified by Korea Electrotechnology Research Institute

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 Picture of Short Circuit Test

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1) 765kV Transformer
1PH 60Hz 2 x 333.3MVA 765/345kV
OLTC type Auto transformer (Bil : 2050kV) : 1998 Developed
1PH 60Hz 204MVA 20.9/765kV
NLTC type Step-up transformer (Bil : 2050kV) : 1999 Developed
1PH 60Hz 370MVA 765/345/23kV
NLTC type Auto transformer (Bil : 2050kV) : 1999 Developed
6. Development of Transformer
2) Gas Insulated Transformer
1PH 60Hz 20MVA 154/23kV OLTC Type Transformer
(Under Development)

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 3PH 60Hz 40MVA 154/23kV (1996)
 "H" Class insulation (95C temp. rise)
 Comparison of "A" and "H" class insulation
Transportation with trailer
Weight : 39.4 Ton
Size(m) : L8.6 x W2.9 x H3.9
3) Mobile Transformer (Developed)
InsulationInsulation No Load LossNo Load Loss Load LossLoad Loss WeightWeight
“A” Class
“H” class
Remark
31 kW
23 kW
74%
241 kW
434kW
180%
35 TON
25 TON
71%
6. Development of Transformer

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 Picture of 154kV 40MVA Mobile Transformer-Using H Class
Insulation (NOMAX Paper)

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7. Major International Clients and Performances
1) North America
CountryCountry ClientClient Rating of TransformerRating of Transformer
U.S.A
Alumnium Company of America
Los Angeles Department of Water and Power
Chelan Country
Black & Veatch
General Electric Company
Baltimore Gas & Electric
CRS Sirrine Engineers
Zurn Nepco
Westinghouse
Florida Power Corporation
Colorado River Commission of Nevada
Sacramento Municipal Utility District
Duke Fluor Daniel
Babcock & Wilcox Engineering
Lower Colorado River Authority
Puget Sound Energy
National Electrical System Inc.
City of Tacoma
New York Power Authority
161/13.8kV, 93MVA
34.5/5.04kV, 16MVA
230/14.8kV, 119MVA
230/15.75kV, 315MVA
138/13.8kV, 125MVA
13.8/2 X 3.9kV, 20MVA
69/13.8KkV, 90MVA
132/11.5kV, 90MVA
138/13.8kV, 150MVA
16/230kV, 235MVA
230/69kV, 200MVA
230/69/13.8kV, 200MVA
115/11kV, 93MVA
138/15.5kV, 160MVA
138/22.8kV, 490MVA
230/117.8kV, 325MVA
115/13.2kV, 115MVA
115/13.8kV, 56MVA
230/13.2kV, 86MVA

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7. Major International Clients and Performances
2) South America
CountryCountry ClientClient Rating of TransformerRating of Transformer
Colombia
Interconexion Electrical S.A
EPM
ESSA
Trinidad & Tobogo Electricity Commission (TTEC)
CELMEC
Chilectra
230/34.5kV, 50MVA
500/230/34.5kV, 150MVA
230/115/46kV, 90MVA
115/34.5/13.8kV, 40MVA
33/12kV, 6MVA
115/13.8kV, 50MVA
230/110/13.2kV, 130MVA
Trinidad
& Tobago
Panama
Chile
Proyecto Ampliacion de LA S. E. 220/60/10kV, 50MVAPeru
JBV Guatemala, LCC 230/13.8kV, 150MVAGuatemala
ENELVEN 200/115/13.8kV, 200MVAVenezuela
Abengoa 115/2 X 13.8kV, 300MVAPuerto Rico
CERJ 138/13.8kV, 33.3MVABrazil

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7. Major International Clients and Performances
3) Asia
CountryCountry ClientClient Rating of TransformerRating of Transformer
Tokyo Electric Power Company
Public Utilities Board (PUB)
66/6.9kV, 20MVA
22/6.6kV, 10MVA
Japan
Singapore
Tenaga Nasional Bhd. (TNB) 275/132kV, 240MVA
Malaysia
Sarawak Electricity Supply Corp. (SESCO) 275/230kV, 250MVA
Sabah Electricity Board (SEB) 275/132kV, 180MVA
Perusahaan Umum Listrik Negara (PLN) 150/20kV, 100MVAIndonesia
National Power Corp (NPC) 230/115/13.8kV, 300MVA
Philippines
Manila Electric Company (MERALCO) 110/34.5/13.8kV, 83.3MVA
Electricity of Vietnam (EVN) 230/121/22kV, 63MVAVietnam
Vietnam POSCO Steel Co. 110/6.6kV, 20MVA
Bangladesh Power Development Board (BPDB) 240/140kV, 150MVABangladesh

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7. Major International Clients and Performances
CountryCountry ClientClient Rating of TransformerRating of Transformer
Electricity Generating Authority of Thailand (EGAT)
Metropolitan Electricity Authority (MEA)
115/34.5/11kV, 50MVA
60/11.5kV, 60MVA
Thailand
Provincial Electricity Authority (PEA) 115/23.1kV, 40MVA
Myanmar Myanmar Electric Power Enterprise (MEPE) 132/33/11kV, 30MVA
Water and Power Development Authority (WAPDA) 230/11kV, 125MVA
Karachi Electricity Supply Corporation (KESC) 132/11kV, 40MVA
Parkistan
D. G Khan Cement Company 132/6.3kV, 20/26MVA
India Oil and Natural Gas Commission (ONGC) 6.6/0.433kV
2000KVA (Cast Resin Type)
Ceylon Electricity Board (CEB) 132/33kV, 31.5MVASrilanka
3) Asia

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7. Major International Clients and Performances
4) Middle East
CountryCountry ClientClient Rating of TransformerRating of Transformer
Electricity Corporation
SCECO-Central
132/33kV, 60MVA
132/13.8kV, 100MVA
Saudi Arabia
SCECO-East 230/115/34.5kV, 400MVA
Iraq
Tabouk Electricity Company 132/13.8kV, 100MVA
Arabian American Oil Company 66/13.8kV, 67MVA
State Organization of Electricity (SOE) 400/138.6/11kV, 250MVA
Yemen Yemen General Electricity Corp. (YGEC) 132/33kV, 25MVA
Water and Electricity Department 11/0.433kV, 1500KVA
(Cast Resin Type)
U.A.E
Lebanon Council for Development & Reconstruction 66/20-11kV, 40MVA
Dubai Electricity Company 33/11kV, 15MVA
Oman Ministry of Electricity and Water 33/11kV, 20MVA
Turkey Turkiye Electric Kurumu
Shunt Reactor
154kV, 5MVAR

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7. Major International Clients and Performances
5) Oceania and Canada
CountryCountry ClientClient Rating of TransformerRating of Transformer
Pacific Power (The Electricity Commission of
New Sourth Wales)
132/11kV, 20MVA
132/69/11kV, 20MVA
Australia
Power Link (Queensland Electricity Commission) 230/34.5kV, 80/120MVA
New Zealand
BHP Engineering Pty Ltd. 132/66/11kV, 120MVA
Shortland County Council 66/13.8kV, 67MVA
New Zealand Aluminium Smelter Ltd. (NZAS) 220/11kV, 50MVA
Papua New
Guniea
The Electricity Commission of P.N.G 132/66kV, 20MVA
Canada
British Columbia Hydro & Power Authority
Richmond Hill Hydro
Manitoba Hydro
Alberta Power Ltd.
Howe Sound Pulp & Paper Ltd.
Yukon Electrical Company
Stone & Webster Canada Ltd.
Transalta Vtilities
Agra Monenco/ Aurora Mine
Saskatchewan Power Corporation
512.5/242/25.2kV, 500MVA
212.5/2 X 28kV, 125MVA
138/13.8kV, 40MVA
243/2 X 13.8kV, 171MVA
260/72kV, 224MVA
260/72kV, 116.2MVA
114.3/2 X 12.47kV, 50MVA
144/25kV, 50MVA
230/13.8kV, 62MVA
128/24.9kV, 29.8MVA

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7. Major International Clients and Performances
6) Europe
CountryCountry ClientClient Rating of TransformerRating of Transformer
ABB Power Generation Ltd. 220/21kV, 420MVASwitzerland
Germany
Denmark
Siemens AG
Johs Gran-Hassen Product Ltd.
132/6.9kV, 40/45MVA
220/60/10kV, 40/50MVA
7) Africa
CountryCountry ClientClient Rating of TransformerRating of Transformer
Egyptian Electricity Authority (EEA) 21/220kV, 395MVAEgypt
Ethiopia
Arco Steel
Ethiopian Electric Light and Power Authority (ELPA)
220/22.5kV, 80MVA
132/15kV, 22MVA
Libya
Heavy Industries Secretariat Tripoil Socialist
People’s Libyan Arab Jamshebreya
11/225kV, 105MVA

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8. Major Production Facilities
1) Over-Head Crane (300 TON x Span 38m)
2) Vacuum Vaporization Facility (L 13m x W 4.8m x H 6.6m)
3) Air - Cleaning Facility (L 45m x W 40m x H 7m)
4) Oil Filtering Machine (8,00 litter / hour)
5) Motorized Transporter for Test (400 TON x 2EA)
6) Core Binding Machine (40 TON x W 8m)
7) Core Lamination Table (120TON)

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9. Major Testing Facilities
1) Impulse Generator System ( 400KV / 600KJ )
2) Oscillation Lightning Impulse Test System (1,800KV / 90KJ )
3) AC Series Resonant Voltage Test System
(1,200KV / 4,800KVA )
4) AC Power Generator System ( 23MVA x 2sets )
5) AC Power Generator System ( 23MVA x 2sets )
6) Condenser Bank ( 158KV, 225MVAR )
7) Transformer Loss Measuring System (200KV / 4,000A )

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10. Major Manufacturing Process
1) Winding Works

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10. Major Manufacturing Process
2) Core lamination

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10. Major Manufacturing Process
3) View of Core Structure (After Completion of Core Lamination)

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10. Major Manufacturing Process
4) Coil Insertion Works

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10. Major Manufacturing Process
5) View of Core and Coil Assembly Works

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10. Major Manufacturing Process
6) Drying Works in Vacuum Vaporization Facility

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10. Major Manufacturing Process
7) Completion of Core & Coil Assembly

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10. Major Manufacturing Process
8) Factory Test