【摘要】 首先通过测量阻抗轨迹法对异相短路故障的测量阻抗的进行分析,得出牵引网发生异相高阻电弧短路故障时,常规原理的阻抗保护将拒动的结论。在异相短路故障特性的基础上,利用电压向量图法对故障电压进行了分析,发现两供电臂电压和相间电压的幅值和相位发生有规律的变化,根据电压变化特征,建立了基于两供电臂电压和相间电压的相关比较,同时结合电流增量保护来实现异相短路故障的保护。通过已有的仿真分析和实际相间短路故障数据分析表明,该方法对异相短路故障具有良好的识别能力,可在牵引变电所保护系统中配置该保护。更多还原

【Abstract】 Conventional impedance relay will refuse to trip according to an analysis of measuring impedance by means of impedance locus method when wrong-phase-coupling of traction power supply system occurs.Based on the characteristics of wrong-phase-coupling faults,by means of voltage vector diagram,variations of two power supply voltage and phase voltage are regular.According to this feature combined with current incremental protection,a new protection scheme is developed.The existing simulation results and the analysis of actual data on the faults show that,with its good ability of fault identification,this protection scheme can be equipped in the traction power supply system.更多还原