220kV母线电压切换引起二次回路失压事故分析

Analysis of secondary voltage loss caused by 220kV bus voltage switchover

介绍了一起扩建工程在500kV新变压器充电时220kV侧电压二次回路失压的事故。经详细分析,此次事故是由于220kV母线电压切换回路原理上的缺陷引起的,指出了这种缺陷并提出了解决的办法,以避免以后发生同样的电压二次回路失压事故,供同行借鉴。

This paper introduces a 220 kV bus voltage loss fault in a new 500 kV substation in expanding project. By analyzing the reasons of secondary voltage loss when energizing a new power transformer, the principle error in the voltage switchover circuit is found out and remedy measure is proposed.