220kV变电站隔离开关控制回路隐患分析及改进方案

Analysis and Improvement Scheme for Hazards on Disconnecting Switch Control Circuit for 220KV Substation

通过对一220 kV变电站隔离开关无法正常分/合闸操作的深入分析,针对隔离开关控制回路设计中存在的缺陷,提出改变微动开关的结构、用隔离开关的辅助接点取代微动开关和增加中间继电器保护缺相保护继电器的改进方案,从而有效避免隔离开关突发分/合闸操作故障。

The paper makes an analysis on the fault of disconnecting switch of a typical 220KV substation, and an improvement scheme is p based on defects in designing control circuit of disconnecting switch, in which the structure of micro switch was changed, the micro switch was termediate relay was increased to protect open-phase relay. replaced by auxiliary contacts of disconnector and an in- The fault of switch-on/off of disconnecting switch was ef-fectiveIy avoided hereby.