Shortening the action time of remote back-up protection and achieving the effect similar to the action of circuit breaker failure protection for the equipment without circuit breaker failure protection when circuit breaker was in failure; 断路器失灵时,对于未装设断路器失灵保护的设备能缩短远后备保护的动作时间以及达到类似于断路器失灵保护动作的效果;
Reconstruction of Dual Back-up Auto-Control Circuit of Diesel Generators 柴油发电机双备份自动控制电路的改造
Using this fault phase selector, back-up distance relay for double circuit lines on the same tower can distinguish between cross country faults near to the end line and internal phase-phase faults responsibly by set coordination. 同杆并架的后备距离保护应用此选相元件,通过适当的整定配合,能可靠地区分靠近线路末端跨线故障和区内相间故障,提高距离保护I段的正确动作率。