多抽头电流互感器的使用

Application of the multi-terminal current transformer

电流互感器(TA)在电力系统中是不可缺少的一次元件,在大网、大机组、大用户地方,元件保护越来越全面,灵活性越来越大,多抽头TA得到了广泛的应用。嵩屿电厂2×300MW燃煤机组,采用发-变单元接线接入220kV系统,其中变压器差动保护,就利用了多抽头TA,本文对调试时发现的现象进行了理论分析,并指导实际进行更改,获得成功。

Multi-terminal current transformer is a very important primary element in the system of vast grid,big machine and large user.Songyu power plant adopts 2×300MW coal-machine that utilizes single generator-transformer to connect to 220kV system.Its transformer differential protection makes use of the multi-terminal current transformer.This paper analyzes theoretically abnormal phenomena in debugging.Experimental results show that the application and popularization of multi-terminal current transformer are necessary.