变压器非标准参数引起35kV线路越级跳闸分析

Analysis on the Bypass Tripping of 35kV Line Caused by Non-standard Parameters of the Substation

根据35kV变电所一条10kV线路永久性故障但故障线路断路器拒动的现象,以变电所设备参数和保护装置故障波形为参考,通过短路电流的故障反演计算和变压器参数分析,可知是#2变压器为非标准参数造成#1和#2变压器高后备保护相继动作,并提出了相应的改进意见。

According to the phenomenon of permanent fault of the 10 kV line in a 35 kV substation and malfunction of the line breaker,based on the parameters of the substation equipments and the failure waveform of the protection devices,combined with the inverse calculation of short-circuit current fault and the analysis of transformer parameters,it is known that adopting non-standard parameters in No.2 transformer leads to high back-up protection successive operation of No.1 and No.2 transformers.Finally,corresponding improvement suggestions are put forward.