摘要
近年来, 广东省内多个发电厂出现过高压厂用变压器或起动-备用变压器在区外故障时或厂用大容量电动机起动时差动保护误动作的情况。为此, 介绍了通过电流互感器伏安特性试验确定其饱和特性的方法, 并用试验验证了这种方法的可行性。最后提出了关于避免差动保护因电流互感器饱和而误动的措施。
In recent years,the HV auxiliary transformers or starting/standby transformers in multiple power plants in Guangdong experienced differential relay misoperation during external faults or the start-up of auxiliary large-capacity motors.Therefore,this paper describes the method of determining current transformer(CT)saturability by volt-ampere characteristic tests.The feasibility of this method is validated by experiments,and suggestions on avoiding differential relay misoperation caused by CT saturation are presented as well.
出处
《广东电力》
2005年第1期16-18,共3页
Guangdong Electric Power
关键词
电流互感器
饱和
差动保护
误动作
伏安特性试验
current transformer
saturation
differential protection
misoperation
volt-ampere characteristic test
