限制接地连发故障的技术实践

Technical Practice of Restricted Earth Fault

变电站有单相接地保护装置,随着电缆馈出线的增多和线路的延伸,发生单相接地故障后,出现故障电流超规、速断动作供电中断、分相真空接触器动作爆炸、熔断器损坏、无功补偿电容器击穿损坏等故障。为解决上述问题,煤矿进行了考察论证,对原保护系统进行了改造,投运后上述故障再未发生,提高了矿井供电的可靠性和安全性。

Transformer substation has single-phase-ground fault protection unit,with the increasing of cable and extending of line, it has single-phase earth fault, supernormal current fault, supply interruption fault, vacuum contactor exploded, fuse protector broken, reactive compensation capacitor broken fault and so on. To solve the above problems,coal mine has exploration and demonstration,transforms original protection sys?tem,improves reliability and safety of mine power supply,faults are not occurred after operation.