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针对带并联电抗器的超高压输电线路,研究了故障后线路断开相并联电抗器与中性点小电抗上的电压特性,发现在永久性故障时,无论是金属性接地还是经过渡电阻接地,断开相并联电抗器上电压与中性点小电抗上电压的比值总是大于瞬时性故障时两者的电压比值。基于上述结论,提出了超高压带并联电抗器输电线路单相自适应重合闸故障的电压判别方法。理论分析和EMTP仿真表明,该判别方法简单、有效,能可靠实现超高压输电线路上的单相自适应重合闸。
For the EHV transmission lines with shunt reactors, the voltage characteristics of shunt reactors and neutral reactors after the fault are studied. It is found that in the case of permanent faults, either the metal ground or the transition resistor ground , The ratio of the voltage across the shunt reactors to the small reactance at the neutral point is always greater than the voltage ratio between the two when the momentary fault occurs. Based on the above conclusions, the voltage discrimination method of single-phase adaptive reclosing fault of transmission line with UHV transformer with shunt reactor is proposed. Theoretical analysis and EMTP simulation show that the method is simple and effective and can realize single-phase adaptive reclosing on EHV transmission lines.