转换性故障下无通道保护动作性能分析

无通道保护利用故障线路对端断路器跳闸引起本端非故障相电流为0作为保护动作判据,但是转换性故障发生后,这个条件可能遭到破坏,从而影响无通道保护的正确动作.文中结合RTDS试验结果对不同的转换性故障和不同的故障转换时间进行了分析研究,结果表明:无通道保护在绝大多数转换性故障情况下都能正确动作,但在转换性故障发生后,如果在保护区内ABC三相上都有故障,不管是对称故障还是不对称故障,无通道保护将拒动;而转换性故障的转换时间不影响无通道保护的正确动作.

PERFORMANCE ANALYSIS OF ADAPTIVE NON-COMMUNICATION RELAY PROTECTION OPERATION UNDER EVOLVED FAULT CONDITION

Non-communication protection based on the operation of circuit breaker at the other terminal decides whether a fault has occurred in the protected line. However, an evolved fault may break the condition of correct operation of noncommunication protection. Hence it is necessary to study the operating performance of non-communication protection under the evolved fault. This paper analyzes the operation performance of adaptive non-communication relay protection together with RTDS tests. By detailed RTDS simulations, this paper concludes that the non-communication relay protection can operate correctly for most kinds of evolved faults, immune to transitional time. However, if after fault evolved, fault exists in three phase, then no matter whether it is symmetric or not, adaptive non-communication protecting relay will refuse to operate and the evolved fault can't accelerate the relay based on overcurrent to trip the circuit breaker.