电流互感器饱和铁心的剩磁在额定工况下的状态分析

State Analysis on Remanence of CT Saturated Core under Rated Condition

对于电流互感器饱和铁心的剩磁在额定工况下的实际状态过去一直都是基于假想与推测,由于剩磁对电流互感器,特别是对保护用电流互感器的影响很大,所以我们不能基于简单的猜想与假设来做为继电保护分析判断的依据。为此,我们采用新的测试方式进行了现场的实测与实验室模拟试验,用实测数据来分析判断饱和铁心的剩磁在额定工况下的实际状态,得到了一个与过去假想与推测不同的结果,这个结果将有助于电网的事故分析。

It is based on the assumptions and speculation that the reality state of remanence of CT saturated core is researched under rated condition. Due to the great effect of remanence on CT, especially on the protection CT, the simple assumption and speculation can not be the criteria for the relay protection analysis judgment. Therefore tests with new test method are performed through spot measuring and lab simulating. The measured data are taken to judge the real state of remanence of satureated core under rated condition, so as to obtain an unexpected result which will contriubute to accident analysis for electric grid.