AT供电相间短路时馈线断路器拒动原因分析

电气化铁道在AT供电制下,接触网如发生相间短路一般都会造成两相馈线断路器的同时跳闸。但实际运用中发现,相间短路后的情况不一定如此。经分析可知,在短路电流不同、残压不同的情况下,会发生一相馈线断路器跳闸而另一相不跳闸的现象。针对拒动原因,采用增加电流增量保护等措施,取得良好效果。

Abstact: In principle, the occurrence of inter-phase short circuit of OCS under AT power supply in electrified railway may cause the simultaneous tripping between two-phase feeder circuit breaker. However, the actual circumstances after the inter-phase short circuit may differ. It is understandable after analysis that one phase feeder circuit breaker may trip and another will not due to the different short circuit current and different residual voltage. For miss operation, the adoption of protection measures for increasing the current gain obtains very good result.