60KV变电所6KV配出双电源并列运行对继电保护影响的研究

Study of 6KV Transformer Substation 60KV Distribution a Pair of Power Side by Side Running Influencing Relay Protection

煤矿60KV变电所6KV侧双回路供电系统中,为确保供电的可靠性,不允许两回路线路并列运行。若两回路并列运行,当线路中出现单相接地故障时会给选线工作造成困难,尤其发生两相或三相短路时对继电保护的影响更大,会造成越级跳闸事故,使变电所全面停电。

In order to guarantee the dependability of supplying power,coal mine 60 KV transformer substation 6KV incline pairs of loop electric power system,can not allow two returning circuits run side by side.If the two cir- cuits runn side by side,when the single-phase earth connection trouble appears in the circuit,it would make se- lecting line work with difficulty when the single-phase earth connection trouble appears in the circuit,especially when taking place two-phase or three-phase short circuit it would be more hugely influence relay protection,and it would cause the immediate leadership accident of tripping and make the transform substation have a power failure all-sidedly.