【摘要】 瞬态恢复电压是发电机断路器的一项重要指标,在开断短路故障时具有决定性意义。弧隙电阻作为发电机断路器开断过程中的内部因素,是否对瞬态恢复电压产生影响并未有人进行过研究。文中利用电磁暂态仿真软件ATP-EMTP计算分析系统开断三相短路故障时,不同弧隙电阻发电机断路器的瞬态恢复电压(transient recovery voltage,TRV),并研究了弧隙电阻与瞬态恢复电压波形之间联系。仿真结果表明:发电机断路器在开断故障过程中TRV的上升率与弧隙电阻的上升率成正相关关系,通过降低弧隙电阻上升率可以降低TRV的上升率;发电机断路器开断过程中,电流过零后弧隙电阻阻值大的断路器产生的瞬态恢复电压峰值小,提高电流过零后弧隙电阻的阻值可以降低产生的瞬态恢复电压峰值。更多还原

【Abstract】 To reveal the effect of arc-gap resistance on transient recovery voltage of a generator circuit breaker during breaking process,the electromagnetic transient simulation software ATP-EMTP is employed to analyze the transient recovery voltage of the generator circuit breaker with different arc-gap resistance during breaking a three-phase short circuit fault,and obtain the relationship between the transient recovery voltage and the arc-gap resistance.Simulation shows that the rise rate of the transient recovery voltage positively relates to the climb rate of the arc-gap resistance,so the reduction of the climb rate of arc-gap resistance results in a decrease of the rise rate of transient recovery voltage;and in the breaking process,the generator circuit breaker with higher arc-gap resistance generates smaller peak value of the transient recovery voltage.更多还原