【摘要】 1995年7月22日，隔河岩电厂＃3机并网过程中，发电机出口开关A相触头对地击穿，葛洲坝换流站I母UZ92（BBC）高阻抗母线差动保护误动跳闸。本文通过计算分析，阐明了这次误动跳闸是由于清换线A相故障电流感应所致。更多还原

【Abstract】 The high-impedance busbar differential relay type UZ92 of busbar I in the Gezhouba commutation station maloperated and tripped due to phase A contact head of circuit breaker of No. 3 generator get flashover to ground in Geheyan Hydro Power Plant during No. 3 generator closed onto system on July 23th 1995. The reason of the maloperation is expounded with detail caculation and analysis in this paper.更多还原