发电机机端TV熔丝熔断对3次谐波电压定子接地保护的影响

Influenced on Third Harmonic Stator Ground Fault Protection When Ahead TV of Generator Fuse Melted

根据国内主流发变组保护中的3次谐波定子接地保护的原理,结合某厂300MW机组运行中机端A相TV一次侧熔丝熔断时3次谐波定子接地保护发生误动的情况,以当时的3次谐波电压值分析TV一次熔丝熔断时的动作行为,提出对3次谐波保护现场使用的一些建议.

According to third harmonic stator ground fault protection relay principle of main types Generator-Transformer Protection and combining malfunction of third harmonic stator ground fault protection relay when A phase ahead TV of generator primary fuse melted,analyzing on operation of third harmonic stator ground fault protection re-lay according to third harmonic voltage value when ahead TV of Generator primary fuse melted,putting forward some advice about third harmonic stator ground fault protection use.