基于零序电压比例差动的机端非全相检测方法

Non-full-phase Detection Method at the Generator Ends based on Zero-sequence Voltage Ratio Difference

近年来因GCB或隔离刀闸引发的发电机机端非全相故障时有发生。为此,提出了一种基于零序电压比例差动的GCB非全相检测方法,定义了非全相保护零序电压的差动分量与制动分量,简化了故障特征提取方式,并对其斜率定值、启动定值及辅助判据进行了探讨。三起不同模式下的机端非全相故障案例的计算结果表明了该方法有效性。

In recent years,non-full-phase faults at the generator ends caused by generator circuit breakers(GCB)or isolation circuit breakers occurred frequently.Thus,a non-full-phase detection method based on zero-sequence voltage ration difference is proposed.The differential component and the braking component of the non-full-phase protection zero-sequence voltage are defined.The fault feature extraction method is simplified,and the slope setting value,starting setting value and auxiliary criteria are discussed.The calculation results of three non-full-phase fault cases at the generator ends under different modes demonstrate the effectiveness of the proposed method.