www.hyosung.com Power Systems PU

HYOSUNGPOWER TRANSFORMER

2009. 10

■ HEAD OFFICE450, Gongdeok-Dong, Mapo-Gu, Seoul, Korea 121-720TEL : 82-2-707-7000

■ R&D CENTER183, Hogye-Dong, Dongan-Gu, Anyang-Shi, Gyeonggi-Do, Korea 431-080 TEL : 82-31-428-1000

■ CHANGWON PLANT454-2, Nae-Dong, Changwon-Shi, Gyeongsangnam-Do, Korea 641-712TEL : 82-55-268-9114

World Class Technology and Capacity

DIRECT CONTACT■Head Office

TEL : 82-2-707-6180~9 FAX : 82-2-707-6117

CONTENTS 04 General 05 Hyosung’s Technology 06 Products and Details

08 Design Concept of Hyosung Transformer 09 Structure 10 Research & Development 11 Network

Power &Industrial SystemsPerformance Group

Power Systems Performance Unit

Power Systems Performance UnitUHV Power TransformerEHV Power TransformerGas Insulated SwitchgearDistribution TransformerCast Coil TransformerGas Circuit BreakerControl PanelWelder

Industrial Machinery Performance UnitElectric MotorsGear Reducers GeneratorsChemical Process EquipmentIndustrial MachineryRopewaysCNG Refill Stations

Hyosung Power Systems strives to enhance the lives of people all over the

world while conserving earth’s natural resources. With the goal to become a

Leading Global Energy Solution Provider, Hyosung will pave the way

towards next-generation technology and green energy solutions.

Hyosung Power Systems has been continuously enhancing customer’s value since it started its operations in 1962.

With core values focused on customer-oriented management, technological innovation and reliable quality,

Hyosung Power Systems has built strong customer relationships based on trust and respect over the years.

It promises to continue its quest to provide value-added products that enhances industrial productivity while

conserving both energy and environment for clients all over the world.

Power Transformers 4/5

As the nation’s first developer of 154kV UHV transformer in 1969, followed by345kV UHV transformer and 765kV EHV transformer, Hyosung has served as a bigcontributor to the nation’s industrial growth. Hyosung’s transformers are the output of successful technological independencegained through constant acquisition and application of sophisticated technologies. Itstransformers are all of high quality and reliability that satisfy both national standardssuch as KS and ESB as well as international standards, namely, IEC, ANSI, IEEE,NEMA, BS, JIS and JEC.

•Production scope- 110kV~765kV Core type transformer (capacity up to 3ph 2000MVA) - 110kV~765kV Shell type transformer (capacity up to 3ph 2250MVA) - 110kV~345kV Shunt reactor - Special purpose transformer •Shunt reactor •Scott transformer •SF6 Gas transformer •Furnace transformer •Mobile transformer

I General I

Hyosung is the leading supplier of the power transformer industry. Starting with the development of the 154kV high-voltagetransformer in 1969, Hyosung introduced the 345kV and the 765kV transformers subsequently for the first time in thecountry, and the sixth in the world. Hyosung’s power transformers are designed to withstand all environmental hazards.In the rated power range up to 2000MVA and operating voltage up to 765kV, these transformers have off-load or on-load tapchangers to adapt them to various network conditions. Hyosung manufactures transformers under IEC, JEC, ANSI, BS and allrequired national standards. Hyosung offers individual solutions for satisfying requirements related to types of operation, lownoise and low losses, connection technology, type of cooling, transportation, installation and so on.

With Hyosung Power Transformers, you obtain not only the transformer but also an Energy Partner for your business

•Quality PartnerFrom the very beginning, Hyosung ensures quality in every step to achieve the best quality.Hyosung shares your goal for the future.

•Experienced PartnerWith its accumulated experience, Hyosung brings you an optimized personalized solution.

•Global PartnerWherever you are, Hyosung’s global network will support and provide you with value.

•On-Time PartnerReliable delivery with reliable quality. Hyosung knows the value of your time.

I Hyosung’s Technology I

At Hyosung, our goal is not only to meet the needs of our customers today but also to provide them better life in the future.

Hyosung’s total quality commitment to our customers is demonstrated by providing the highest quality product at the mostcompetitive prices with on time delivery. Hyosung achieves these high quality levels through our integrated quality assuranceprogram. Hyosung’s products are used extensively both at home and abroad. This level of experience allows Hyosung’squality assurance and reliability to exceed those of our competitors. We share our customer’s goals with high qualityproducts. From design to assembly, testing and installation, our customer’s requirements are our minimum standards. All testsare based on International standards and our customer’s requirements. Through additional testing, Hyosung seeks to exceedestablished testing criteria, thereby producing more reliable products. Our special process operators and technicians arehighly trained. Continued professional growth and advanced training are encouraged through internal training groups andoutside courses.All Hyosung’s products have ISO 9001, ISO 14001 and OHSAS 18001 certifications. Hyosung endeavors to maintain thehighest quality.

•ScopeIn line with major international standards for quality assurance, the quality assurance program of our plants includes thefollowing elements.- Contract review - Inspection/test control- Design control - Measuring and test equipment- Procurement document control - Storage, handling and shipping- Material purchasing- Nonconforming item- Identification - Quality assurance records- Special process

I Hyosung’s Total Quality Assurance I

World Class Technology and Capacity to Meet Global Challenges■Type / Rating- Core Form : Up to 3ph 765kV 2000MVA - Shell Form : Up to 3ph 765kV 2250MVA

Core-Form Shell-Form Transformer Production Hall

ISO 9001 ISO 14001 OHSAS 18001

Power Transformers 6/7

Products and Details

Core form transformer refers to the structure of locating low-pressure/high-pressure windingsurrounding core to concentric circle.

•Characteristic

- Compact structure - Easy assembly

- Linear potential distribution - Circular form with short circuit strength

- Easy inspection and repair

Shell form transformer refers to the structure of layering core around winding to support winding fromthe circumference.

•Characteristic

- Consistent potential distribution - Short circuit strengthallowing for high dielectric strength - Outstanding cooling efficiency

- Easy manufacturing of special transformers - Lay-down shipping (furnace transformer, traction transformer)

Core Form Transformer Shell Form Transformer

Item Phase Rated Voltage Capacity

765kV Transformer1 ph 765/345/23kV 667MVA

- KEPCO in KOREA

345kV Transformer3 ph 345/118/22.5kV 550MVA

- NSTAR in USA

230kV Transformer3 ph 230/115/13.2kV 224MVA

- DVP in USA

Item Phase Rated Voltage Capacity

765kV Transformer1 ph 765/20.9kV 395.7MVA

- KEPCO in KOREA

500kV Transformer1 ph 525/230/34.5kV 433MVA

- BPA in USA

345kV Transformer3 ph 345/118/34.5kV 672MVA

- Xcel Energy in USA

765kV Transformer

345kVTransformer

230kV Transformer

765kV Transformer

500kVTransformer

345kV Transformer

Power Transformers 8/9

Design Concept of Hyosung Transformer

Hyosung transformers guarantee dielectric strength to withstand impulse voltage thanks to high-technology designwhich ensures low capacitance between winding and the ground and proper coordination of insulating materialand solves creepage problem.

Dielectric Strength

Heat generated from coils which form electric circuit inside the transformer andheat from iron cores form magnetic circuit and is transmitted to insulating oil. Heattransmitted to insulating oil radiates to the air through the cooler. Cooling effect isvery important as it is directly linked to insulation life and the capacity of thetransformer. Hyosung’s transformers lay emphasis on improving coolingperformance and regulating temperature of the hottest spots by using an effectivecooling system.

Thermal Capability

Reliability of transformers manufactured by Hyosung is excellent because ofwinding and tank design which distributes mechanical force evenly in case ofshort circuit and supports short-circuit strength effectively.

Mechanical Strength

Hyosung’s transformers are designed and manufactured through verification from the design stage usingdesign program, electromagnetic field analysis program, and structural analysis program.

Structure

Core is layered on step-by-step to maximize space ratio, which enables theassembling to minimize core loss, exciting current and noise. In addition, themost effective core structure is applied depending on whether the transformeris core form or shell form.

01 _Core

Transformer enclosure is manufactured with sufficient strength to protectinternal structures, preserve insulating oil and withstand internal pressureduring failures. Tank should be furnished with manhole or hand-hole in anappropriate location for convenient inspection and repair as well as equipmentand accessories to help move and handle transformer with ease.

02 _Tank

Winding is the key part making up transformer’s electric circuit. Hyosung’s transformers apply the most effectivewiring method for core form and shell form using rectangular wire or CTC (Continuously TransposedConductor).Also, the key process of winding is carried out in the dust-proof clean room with temperature and humiditycontrol. The clean room with NAS 100,000 grades is one of the main factors that guarantee the quality ofHyosung’s power transformers.

03 _Winding

Continuous Winding Pancake WindingHisercap Winding Cylindrical Winding Helitran Winding

[ Shell Form ][ Core Form ]

Power Transformers 10/11

Research & Development Network

R&D Center identifies innovation, creation and expertise as core value, and concentrates on world top-classR&D activities in the 21st century with a philosophy aspiring for customer satisfaction, quality priority andperformance orientation.

Structural analysis analyzes themaximum stress and maximumsag.

Structural Analysis

Tank Cover Strength and Rigidity Analysis Pressuring Strength and Rigidity Analysis Lock Plate and Punching Strength Analysis

To manufacture highly stabletransformer, Hyosung’s R&Dcenter analyzes the temperatureand flow distribution inside thetransformer’s winding by usingcommercial programs.

Heating Analysis

Winding 2D Analysis Radiator 3D Model Radiator Temperature Distribution

Through the interpretation ofthe magnetic field analysis,overheating and loss oftransformer can be predictedand interpreted. Also,calculating the reactor’smagnetic induction creates amore efficient transformer.

Magnetic Field Analysis

Furnace Transformer Tank Loss Analysis Reactor Analysis Lock Loss Analysis

Through the interpretation ofelectric field analysis, Hyosung’stransformer becomes morestable for adequacy of placementand insulation that is verifiedbetween high and low voltage.

Electric Field Analysis

Electric Isolation Analysis

Global NetworkAggressive Expansion of Global Customer Support Structure

Service NetworkHyosung’s Worldwide Service Network for Timely Service