一起3/2接线方式敞开式隔离开关发热故障分析

Heating Fault Analysis of Open-type Isolation Switch under 3/2 Connection Mode

文中主要针对一起3/2接线方式隔离开关接触不良引起保护装置异常事件,从3/2接线方式等值电路、电流分配、接触电阻增大和线路负载变化所引起接触点温升特性等方面进行分析,并与双母线接线方式中隔离开关接触不良引起温升特性进行对比,得出3/2接线方式中隔离开关接触不良所引起接触点温升特性与负荷变化、标准回路电阻变化的对应关系和差异。

Aiming at an abnormal event of protection device caused by poor contact of isolation switch under 3/2 connection mode, the characteristics of contact temperature rise caused by the equal circuit under 3/2 connection mode, current distribution, the increase of contact resistance and line load are analyzed. The characteristics are compared with that of temperature rise caused by poor contact of isolation switch under double bus connection mode. The relationship and differences between contact temperature rise caused by poor contact of isolation switch and the change of load and preferred circuit resistance under 3/2 connection mode are obtained.