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分析了交流电气化铁路电力机车带电过分相区时产生电弧的过程,通过对这一过程的分析得出了四段电弧的基本模型,其中的第二次和第三次电弧同时出现时就引发了交流电气化铁路牵引供电系统电分相处的异相短路故障.计算出了牵引变电所出口处电分相异相短路发生时的短路电流,与电流速断保护整定值比较后可知保护拒动,不能及时切除故障,电弧的高温会烧断接触导线.针对电弧引发异相短路时电分相处接触导线的温度会迅速升高的特点,提出了电分相处增设接触导线温度保护的新的异相短路继电保护策略.
The process of arc generation when the AC electrified railway locomotive is charged with over-phase region is analyzed. By analyzing this process, the basic model of four-segment arc is obtained, in which the second and third arcs simultaneously trigger AC electrified railway traction power supply system phase-to-phase short-circuit fault.Calculated the traction substation outlet phase short-circuit current when the phase short-circuit occurs, and the instantaneous current protection setting value comparison shows that the protection of refusing to move, can not In order to cut off the fault in time, the high temperature of the arc will blow off the contact wire.Aiming at the characteristic that the temperature of the contact wire will rapidly increase when the electric arc induces out-of-phase short circuit, a new out-of-phase short circuit Relay protection strategy.