500kV线路距离手合加速跳闸事故分析

Accident Analysis of 500kV Line Distance Hand-acceleration Trip

针对某500kV输电线路距离手合加速跳闸事故,分析事故原因为线路压变端子箱内为第二套线路保护提供测量电压的空开存在质量问题,导致第二套线路保护测量阻抗几乎为零,距离手合加速出口动作跳开开关,最后提出整改建议,以防此类事故的再次发生。

To the accident of distance hand-acceleration trip in 500kV transmission line,it was analyzed that there was a problem with the air switch which provided measuring voltage for the second line protection in the PT box. As a result,the measuring impedance of the second line protection was almost zero after the circuit breaker was closed. The protection action of distance hand-acceleration led to the opening of the circuit breaker. In order to prevent such trip accidents from happening again the rectified suggestions were proposed.