【摘要】 在建立电弧模型的基础上,对异相电弧短路故障信号进行仿真分析,证明原有的馈线保护原理存在缺陷。对牵引供电系统异相电弧短路故障发生时,各相电压电流的谐波特点进行分析研究,提出了通过检测异相短路两供电臂间电压来确认异相短路发生时的低压保护方案。通过对轻、重载和单臂、双臂工况下发生异相电弧短路故障时的两供电臂间相间电压仿真,验证了该保护方案的正确性,有效性和可行性。这种保护方案可作为牵引网异相短路的主保护,并与牵引网馈线成套保护结合,组成牵引网完整的保护策略。更多还原

【Abstract】 The fault sign of wrong-phase arc short circuit is simulated and analyzed by building arc model.The flaw of the existing feeder protection principle is proved.Based on the analysis of the harmonics characteristics of each phase voltage and current that result from wrong phase arc short circuit,the low voltage protection principle by detecting the voltage between the two supply arms is proposed to confirm the appearance of wrong phase short circuit.The correctness,effectiveness and feasibility of the protection principle are verified by simulations of the voltage between the two supply arms in the conditions of the light load,heavy load,and one arm,two arms short circuit.This protection principle can be used as the main protection against wrong phase arc short circuit in traction network,and it can be combined with traction supply feeder complete protection to form a complete protection strategy.更多还原