摘要
母差保护是电力系统的一项重要保护,母差保护动作的准确可靠性对整个电力系统的安全运行至关重要,近些年来,因为母差保护误动作引起重大的电网事故较多。文章对一起由线路区外故障引起母差保护误动作的案例分析,得出电流互感器TA发生饱和是导致这起母差保护误动作的原因,同时利用数学模型判据来检测电流互感器TA的饱和,效果可靠。
Mother differential protection of power system is one of the most important protection,differential bus protection action accurate reliability for the whole power system is very important to safe operation,in recent years,because mother differential protection misoperation cause major grid accident more.In this paper,by line together outside the fault cause mother differential protection misoperation of case analysis,it is concluded that current transformer TA saturation is happened to the mother differential protection misoperation reason,at the same time using mathematical model criterion to detect current transformer TA saturation,the effect is reliable.
引文
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