小容量发电机出口断路器及馈线断路器瞬态恢复电压仿真研究

国内外学者论证了大容量发电机出口装设发电机断路器（generator circuit breaker，GCB）的必要性，而对小容量（≤30 MW）发电机出口及发电厂内馈线是否也应装设GCB并没有进行深入研究。利用电磁暂态仿真软件PSCAD/EMTDC计算分析了在开断条件最恶劣的三相短路故障情况下，12~30 MW小容量发电机出口断路器及馈线断路器的瞬态恢复电压（transient recovery voltage，TRV），并从TRV上升率的角度出发，确定普通配电型断路器是否可以替代GCB安装在发电机出口及厂用电馈线处。计算结果表明，当发电机出线端及厂用电馈线中分别发生三相短路故障时，断路器TRV上升率均未超过0.34 kV/μs，普通配电型断路器可以替代GCB安装在小容量发电机出口及厂用电馈线处。

Simulation Research on Transient Recovery Voltage of Outlet Circuit Breaker in Small Capacity Generator and Feeder Circuit Breaker

Scholars have demonstrated the necessity of installing generator circuit breaker （GCB） in large capacity generator terminal, but they did not make in depth study on whether GCB should be installed in small capacity generator （≤30 MW） terminal or feeder line. So in this paper, transient recovery voltage （TRV） of circuit breaker in small capacity generator（12-30 MW）terminal and feeder line was researched with using electromagnetic transient program PSCAD/EMTDC, under three-phase short circuit fault in the worst breaking condition. Then, this paper determined whether distribution circuit breaker could replace GCB to be installed at generator terminal or feeder line. The calculation results show that when three-phase short circuit fault occurs in generator terminal or feeder line, respectively, the TRV rising rate of circuit breaker is no more than 0.34 kV / μs, thus distribution circuit breaker can replace GCB to be installed at generator terminal and feeder line.