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INTRODUCTION OF ULTRA-HIGH VOLTAGE (UHV) 1000 kV AC TRANSFORMER Presented By Zhijin Chen TBEA Shenyang Transformer Group Co. Ltd. China

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Structure of 1000kV AC Transformer

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Parametersof 1000kV/1000 MVA UHV AC Transformer Made by TBEA, China Made by TBEA, China

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1) Rated Capacity HV Winding ： 1000 MVA MV Winding ： 1000 MVA LV Winding ： 334 MVA 2) Rated Voltage HV Winding ： 1050/√3kV MV Winding ： 525/ √3 ±4×1.25%kV LV Winding ： 110kV 3) Rated Frequency ： 50Hz 4) Three-phase Connection Symbol ： YNa0d11 5) Nominal Short-circuit Impedance (based on 1000MVA) ： HV － MV ： 18% HV － LV ： 62% MV － LV ： 40%

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6) Type of Cooling ： Main Transformer - OFAF Voltage-regulating Transformer - ONAN 7) Temp. Rise Limit Value ： Winding ： 65K Top Oil ： 55K Hot-spot: 78K Tank Surface ： 80K 8)Total weight of Main Transformer ： 535 ton Total weight of Voltage-regulating Transformer ： 143 ton

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9) Internal Insulation Level ： Rated Short-time Power-frequency Withstand Voltage (r.m.s. value ， 5min ） Rated Switching Impulse Withstand Voltage （ relative peak value ） Rated Lighting Impulse Withstand Voltage （ peak value ） Full Wave Chopped Wave HV1100 kV1800 kV2250 kV2400 kV Rated Short-time Power-frequency Withstand Voltage （ r.m.s. value ， 1min ） Rated Switching Impulse Withstand Voltage (relative peak value) Rated Lighting Impulse Withstand Voltage (peak value) Full Wave Chopped Wave MV630 kV1175 kV1550 kV1675kV Neut.140 kV / 325 kV / LV (Tert.) 275kV / 650 kV750 kV

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Technical Applied on Design and Production of 1000kV/1000 MVA UHV AC Transformer

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-- Main Insulation -- Longitudinal Insulation kV Leads -- Magnetic Leakage & Losses -- Winding Temp. Rise -- Short-circuit Withstand Capability -- Strength of Tank Transportation -- Seismic Strength

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Key Technical Characteristic Studies ——Longitudinal Insulation

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Electric field intensity distribution at the middle part between LV and HV windings Electric field intensity distribution at the end between LV and HV windings

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Electric field intensity distribution of main insulation calculation by utilizing ANSOFT at the end between LV and HV windings Electric field intensity distribution of main insulation calculation by utilizing ANSOFT at the middle part between LV and HV windings.

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Key Technical Characteristic Studies ——1000 kV Leads

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—Magnetic Leakage & Losses 5 Limb Core with 3 Parallel Wound Legs Required Stringent Quality Control to Prevent Circulating Current Losses

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Key Technical Characteristic Studies ——Winding Temp. Rise

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Key Technical Characteristic Studies ——Short-circuit Withstand Capability Axial forces on a disc of a winding during short circuit TV winding radial and axial leakage flux distribution

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——Strength of Tank Transportation Diagram of tank metamorphose under transportation condition Enlarged diagram of tank stress under transportation condition

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——Seismic Strength Diagram of stress distribution under earthquake situation Diagram of transformer bushing displacement response during earthquake….long bushing needed special analysis

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Some Testing Results on The Product of 1000kV/1000 MVA UHV AC Transformer

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Required ValueProduct Trail Value HV Partial Discharge Level ≤100pc25pc MV Partial Discharge Level ≤200pc60pc LV Partial Discharge Level ≤300pc20pc

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Required ValueProduct Actual Value Top Oil Temp. Rise55K25K HV Winding Temp. Rise65K45K MV Winding Temp. Rise65K53K LV Winding Temp. Rise65K49K Tank Hot Spot Temp. Rise 80K40K No-load Audible Sound75dB(A)74dB(A) Load Audible Sound75dB(A)

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Total losses tested Guarantee Final Test Load loss, kW No load loss, kW

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The construction of China’s first 1000kV UHV transmission project was completed successfully in 2008, and passed 168-hour full load energized performance test in January 2009.

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Thank You! TBEA Shenyang Transformer Group Co., Ltd.

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