PT断线时方向元件的性能分析

The performance of directional element when PT secondary circuit open

研究了PT断线情况下的方向元件性能。通过对常用的几种方向元件的动作方程进行推导和比较 ,发现它们的性能在不同的情况下差异很大。认为方向元件在电压回路出现问题时 ,不应一概退出 ,如果能够根据具体的情况分别处理 。

In this paper,the performance of directional element when PT secondary circuit open is studied.By the study and comparison,it is concluded that the directional element should not be canceled thoroughly.It is helpful for improving the relay's performance if deal it according to different cases.