220kV线路故障时35kV低周减载动作分析

Condition Analysis on 35 kV Low-Cycle Load dropping Operation When 220 kV Line Fault

通过对星火站一次220kV线路故障时35kV线路低周减载出现整定频率高的线路未跳而整定频率低的线路跳开的动作情况进行了分析,闸述了SEL—351微机型继电器频率元件动作特性及其在低周减载过程动作行为,并由此对类似接线形式的变电站,在备自投与低周减载的动作快慢上提出了相关建议。

This paper discusses SEL-351 low-cycle load dropping logic module of Xinghuo station,operation condition of Xinghuo station 35 kV line low-cycle load dropping in August 22,2004 is analyzed,the related suggestions on operation speed of reserve automatic throw-in and low-cycle load dropping are proposed to the substation that have resemble wiring type.