Power Distribition 220kV Oil Immersed Power Transformer YNyn0d11 Three Winding GB1094

220kV Three-phase Three-winding On-load-tap-changing Distribution Transformer

The 220KV transformer adopted the full folding plate tank structure of 110KV transformer, making its structure more rational, easier for site installation and inspection. Combining our many years of design and manufacture experiences, the reliability and performance of the product have reached international advanced level.

Through continuous improvement and alteration, our products are with characteristics of low loss, low noise, low partial discharge, high short circuit withstand capacity, high impedance, and fully-enclosed structure. The series covers two-winding and three-winding off-circuit tap changing power transformer, on-load tap changing transformer and tap-changing auto transformer. Main features as follows:

1 Product Features of 220kV Three-phase Three-winding On-load-tap-changing Distribution Transformer

1.1 Product standards

GB1094.1~2-2013

GB1094.3-2003

GB1094.5-2008

GB/T6451-2008

IEC60076

1.2 Low loss

Core all-helical stacking with STEP joints, and advanced stacking process, reduced the load loss, load current and electromagnetic noise.

1.3 Low partial discharge

To ensure the safe and steady operation of the transformer under continuous rated voltage, our Electric Power Research Institute conducted loads of research to develop a more reasonable insulation structure, plus the strict technology specifications and technical staff experience, ensured the low partial discharge of our products.

1.4 High strength

The tank can withstand the vacuum test and required positive pressure test.

2 Technology Features of 220kV Three-phase Three-winding On-load-tap-changing Distribution Transformer

2.1 For the core fabrication, we use high quality and superior performance Hi- B silicon steel sheet, using the CNC controlled CEORG core cutting line, ensure the silicon steel burrs and angle error, so that after the cutting, it can be moved to the stacking process right away.

For the core stacking, we adopted 45 degree full reclining, multi- joint core type. Core columns are pre-compressed use synthetic material or steel ribbon, together with the corresponding fixture and process condition, to ensure the clamping force in a reasonable condition, for the assurance of core quality.

Use spherical measures to eliminate the possibility of interior line deformation under the short circuit status.

2.2 Use advanced kerosene vapor drying equipment to thoroughly dry the transformer, and the oil- pumping is carried out under complete vacuum condition, to ensure the insulation of insulators and oil, therefore greatly improved the safety and reliability of the product.

3. Parameter sheet of 220kV Three-phase Three-winding On-load-tap-changing Distribution Transformer