某公司110KV变电站2#变压器差动速断保护跳闸故障分析

Fault Analysis of Second Transformer Differential Fast Tripping Protection in 110KV Substation of a Company

2015年7月19日某公司110KV变电站2#主变差动保护动作,导致GIS室102开关跳闸。本文针对本次变压器差动保护跳闸事件,结合实际,通过理论计算查找跳闸点,通过变压器三相短路值分辨出跳闸发生在110或者是10KV侧。利用计算得到短路电流值与故障录波值比较,最终得出跳闸点在高压侧,然后再通过实际勘察得出高压侧跳闸的实际具体部位,结合现场实际分析导致跳闸的实际原因。

A company’s second main substation of 110 kV transformer differential protection action in July 19, 2015, resulting in GIS Room 102 trip switch according to the tripping incident. The transformer differential protection in combination with the actual situation, through the theoretical calculation for the trip point, distinguishes the trip occurred in 110 or 10 kV side of the transformer by three-phase short circuit value. Using the calculated short-circuit current value fault recorder value comparison, finally obtains the trip point on the high pressure side, and then through the actual specific parts of actual investigation that high side trip, combining with the actual analysis of the actual cause of the trip.