浅析四绕组变压器

Analysis of Four-Winding Transformer

在220 kV/110 kV/35 kV的变压器里,当高压侧发生单相接地故障时,3次谐波无法通过星形绕组,会使变压器发热等,所以在变压器内部多了一个三角形绕组,这个三角形绕组起到保护变压器的作用,这样就构成了四绕组变压器。本文介绍了四绕组变压器的基本原理,分析了其国内研究历程及其优缺点、适用范围。

In a 220 kV/110 kV/35 kV transformer,when a single﹣phase ground fault occurs on the high﹣voltage side,the third harmonic cannot pass through the star winding,which will cause the transformer to heat up,so there is an extra delta winding inside the transformer.The delta winding functions to protect the transformer,thus forming a four﹣winding transformer.This article introduces the basic principles of the four﹣winding transformer,and analyzes its domestic research history,its advantages and disadvantages,and its scope of application.