For backup protection against high resistive ground faults, there will be a dual polarized directional overcurrent relay, inversetime with instantaneous trip attachment.
对于后备保护装置防止高阻抗接地故障,将配置一只双极方向过电流继电器,同瞬时跳闸附件的时间成反比。
2
The distance protection with inversetime characteristic is the best choice to solve the conflict between fast trip near the protecting relay and reliable trip at the end of protection zone.
反时限距离保护是解决近范围快速动作与保护范围末端可靠动作之间矛盾的最好策略。
3
The improved PSO algorithm is tested in two models, to show the effects of improvement and its ability in solving the inversetime overcurrent relay coordination problem when DG units are connected.