Off Load Tap Changing 220kV Phase Converter Transformer Off Circuit YNd11 IEC

220kV Three-phase Two-winding Off-circuit Tap-changing Power 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. 220kV Three-phase Two-winding Off-circuit Tap-changing Power Transformer  Product Features

1.1 Product standards

GB1094.1~2-2013

GB1094.3-2003

GB1094.5-2008

GB/T6451-2008

IEC60076

1.2 Low loss

Optimization of electromagnetic calculations, using combined technology of electrical shielding and magnetic circuit, effectively controlled leakage, s0 as to reduce the load loss and to avoid partial overheating.

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

Adoption of six-side positioning method for the body, meets the transportation requirements of, horizontal acceleration not more than 0.3g, vertical direction not greater than 0.1 5g.

2 220kV Three-phase Two-winding Off-circuit Tap-changing Power Transformer Product Features Technology Features

2.1 Transformer oil tank sealed structure adopted Tianan typical design, with strict control of sealing material and the compression coefficient of the sealing rings, a formal leakage test would be carried out after the completion of assembly process, so as to ensure the tank is leakage-free.

2.2 Changed the traditional process of coil assembly. use pre- assembly structural design, with the technology and craft, to avoid decrease of mechanical strength caused by the overall contraction during the drying process.

Use imported laminated wood at coil ends, with good mechanical and electrical quality.

Constant pressure device is used during the transformer assembly process, to apply axial pretightening force on the three-phase coil and insulation parts.

3. 220kV Three-phase Two-winding Off-circuit Tap-changing Power Transformer Product Features Parameter sheet