P级与PX级CT构成的差动保护可靠性分析

Reliability of Differential Protection Consist of P-class and PX-class CTs

针对差动保护各侧CT类型不一致可能会导致差动保护区外故障误动作的问题,文章通过安哥拉某新建电厂的发变组保护实例,进行差动保护整定计算和分析,得出选择P级和PX级CT构成差动保护,根据通用的整定计算原则,不会导致差动保护误动作的结论。

In order to solve the problem of differential protection possible to make differential protection calculation and analysis misoperation for the CT＇s inconsistent characteristics,it is through the example of a new power plant in Angola.It was concluded that, according to the general setting calculation principle,the selection of P-class and PX-class CT constitute differential protection will not lead to differential protection misoperation.