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针对广州蓄能水电厂A厂在轻载发电工况下,发电机机端断路器(GCB)发生单相断线时,相关保护未能及时切除故障导致事故扩大的现状,利用对称分量法对GCB非全相故障进行了理论分析,并运用PSCAD软件搭建了GCB非全相故障的动态仿真计算模型。根据故障特征提出了以GCB两侧基波零序电压的相角差作为GCB非全相保护新型判据的构想,通过动模实验验证了仿真计算模型的正确性与GCB非全相保护新型判据的合理性。
Aiming at the situation that the protection of Guangzhou Pumped Storage Power Plant A under light-load power generation conditions, single-phase disconnection of Generator Breaker (GCB), the relevant protection failed to timely remove the fault lead to the expansion of the status quo, the use of symmetrical component method GCB non-all-phase fault is analyzed theoretically, and PSCAD software is used to build a dynamic simulation model of GCB non-all-phase fault. Based on the fault characteristics, the concept of phase angle difference of fundamental zero - sequence voltage on both sides of GCB is proposed as a new criterion for GCB nonphase protection. The correctness of simulation calculation model and the new type of GCB nonphase protection According to the rationality.