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400kV Step-down Oil-immersed Power Transformer

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400kV Step-down Oil-immersed Power Transformer Product Details:

To cope with the increasing demand in electrical power, power transformer capacity is growing larger and larger. In particular, the capacity of generator transformers for thermal and nuclear power stations have become very large.

CTSS digests and absorbs the advanced manufacture technology of the world, accordingly develops on its own hands 400kV transformers on the basis of CTSS` own experiences and advantages.

CTSS (China Transpowers Electric Co.,Limited) is renowned and appreciated by its reliable products performance and integrated services. 


Ø  IEC-76 .1-1993 Power Transformers: general

Ø  IEC-76 .2-1993 Power Transformers: temperature rise

Ø  IEC-60076-3: 2000 Power Transformers Insulation levels, dielectric tests and external clearances in air

Ø  IEC60076-4-2002 Power Transformers part4 guide to the lighting impulse and switching impulse testing-power transformers and reactors

Ø  IEC-60076-5:2000 Power Transformers ability to withstand short circuit




Ø  Electromagnetic calculations: Adopt most advanced design software, SolidWorks three-dimensional software and to guarantees all performance indexes

Ø  Strength analysis: COMOS software

Ø  Leakage magnetic distribution and its electro-dynamic force: leakage magnetic field analyzing software

Ø  Electrical insulation: Power frequency electrical field calculating software and lightning over-voltage winding potential distribution calculating software for calculating of gradient distribution of main insulation, longitudinal insulation and impulse voltage in the windings as well as that of winding terminals.


Ø  Core: effectively upgrade transformer’s no-load performance by below methods:

Adopt high-quality imported silicon steels

Three phase five limb drawing plate structure

Five-step of laminated, fully mitered, with the technique of none-pile on upper yoke

Meanwhile, appropriate magnetic flux density and the auto-oscillation frequency of cores are selected for lowering transformer’s sound level.


Ø  Winding:

²  Optimize winding transposing to effectively reduce load losses and eddy current losses as well.

²  Zigzag oil conduit structure to lower average temperature rise and the hot-spot temperature rise and thereby extend transformer’s service life.

Ø  Core structural parts: decrease the stray losses by lowering eddy current losses, drawing plates of core or minimizing slots on the basis of the location of core structural parts.

Ø  Transformer tank: combining magnetic blocking and copper blocking methods to reduce the stray losses.


Features of products:

Ø  Low loss

Ø  Low noise

Ø  No hauling

Ø  With innovation in safety

Ø  Reliability assured

Ø  Low maintenance

Ø  Fully tested and certified

Ø  Suits local conditions

Ø  Cost effective

Ø  Easy operation


Brief specification:

Ø  Voltage class: 400kV

Ø  Capacity: 100000334000kVA

Ø  Short circuit impedance: 14%

Ø  No load current: 0.15~0.25%

Ø  Losses: no-load losses is strictly comply with IEC standard requirements


Typical specification:

Ø  Model: 250000-400kV

Ø  Rated voltage:400kV

Ø  Rated Capacity:250000kVA

Ø  Type: Three Phases, OLTC (On-oad tap changer), Power Transformer


Application: 400kV power system of power plant, substation, mining enterprise and etc.

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