For backup protection against high resistive ground faults, there will be a dual polarized directional overcurrent relay, inverse time 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
Backup flames, also lit from the birthplace of the ancient games in Olympia, Greece, are with the relay at all times to relight the torch.
The negative sequence distance relay gets free from the winding connection of the transformer. So it is the best choice to use the kind of the distance relays for the transformer backup protection.