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针对安装氧化锌避雷器式故障限流器的500kV输电系统,利用电磁暂态计算程序分析了限流器旁路开关不同断开时间和不同弧道电阻对潜供电流特性的影响。基于等效阻抗网络和拉普拉斯变换方法,分析了潜供电流自然振荡频率与衰减系数的变化情况,从理论上解释了潜供电流低频分量的产生机理。提出了氧化锌避雷器式故障限流器与单相自动重合闸的时序配合策略,并进行了仿真验证。仿真结果表明,该策略可有效消除可能的潜供电流低频分量对单相自动重合闸的不利影响,既能确保自动重合闸操作的正常时序,又能兼顾故障限流器的自恢复特性。
Aiming at the 500kV transmission system with MOA fault limiter installed, the influence of different off - time and different arc resistance of the current - limiter bypass switch on the characteristics of the sub - supplied current was analyzed by electromagnetic transient calculation program. Based on the equivalent impedance network and Laplace transform method, the change of natural oscillation frequency and attenuation coefficient of sub-supplied current is analyzed, and the generation mechanism of low frequency component of sub-supplied current is explained theoretically. A time matching strategy of MOA fault current limiter and single-phase automatic reclosing is put forward and simulated. The simulation results show that this strategy can effectively eliminate the possible negative influence of the low-frequency component of the sub-current on the single-phase auto-reclosing, which not only ensures the normal sequence of auto-reclosing operation but also balances the self-recovery characteristics of the fault current limiter.