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Cascade Transformer
Jun 11, 2018

At present, voltage transformers in China's voltage grade 66kV and above are mainly made into cascade type to simplify the insulation structure, save the insulation material, reduce the weight and reduce the cost.

Cascade voltage transformers are single phase to ground voltage transformers. A series of winding is divided into several parts of equal number of turns, each of which is made up of a winding in each of the core columns, forming one level in the cascade, and then connecting the windings at all levels, the U end is connected to the high voltage, and the N end is connected to the ground. Each level is only at a certain voltage of rated voltage, its insulation can be evenly distributed at all levels, so insulation materials can be saved.

The 110kV cascade voltage transformer usually sets a closed circuit core to be divided into two windings in series (level two). In general, the 220kV has two closed circuit cores, which are divided into four windings in series (four stages), and the first winding is around the last stage of the iron core column. The core contains the 3/4 of the rated voltage of the core of the 1/2220kv transformer with voltage 110KV transformer to the rated voltage, and the core of the iron core to the rated voltage 1/4, so the core and the iron core should be insulated.


Add: No.38 South Taoyuan Road, Yaozhuang Town,Jiashan County, Jiaxing City, Zhejiang Province, China
Contact person: Elva Zhuang&Sunny Ni
Tel:+86-573-84775555
Fax:+86-573-84776699
Phone:+86-13732570078
E-mail:sales9@great-relay.com
       sunny.ni@great-relay.com