微机变压器保护中的TA异常分析

Analysis on Microcomputer Transformer Protection during Abnormal State of TA

随着微机保护在实际运用中越来越广泛,因TA异常造成的误动呈现逐步增长的趋势。针对现有TA异常判据的缺陷,提出了一种新的TA异常判据,并对TA异常后以及TA异常自恢复时的保护动作行为进行了分析,较好地解决了实际运行中TA异常引起的差动保护误动的问题。

With wider application of microcomputer protection in practice the malfunction caused by abnormal state of TA has a growing tendency. Pointing to the defect of TA abnormal criterion, the author gives a new criterion of abnormal TA and also analysizes the protective actions after TA abnormal and during self - recovery of abnormal TA. It has solved better the problem of differential protection malfunction caused by TA abnormal in practice.