【摘要】 通过对双回线非全相运行时同名相差电流的分析,提出了一种利用同名相电压降判别双回线解列运行的新方法.该方法考虑了零序电流和两回线长度不相等因素,能有效判别双回线非全相解列运行状态.仿真结果表明,该方法在双回线各种非全相并列运行状态下,修正后的差电流明显小于修正后的和电流,在各种解列运行状态下修正后的差电流大于修正后的和电流,不会发生误判.更多还原

【Abstract】 Analyzed the differential current in the same phase of doublecircuit line, a new criterion is proposed that identifies the breakup operation by comparing the voltage of the same phase. The facts, such as zerosequence current and two lines of different lengths, are taken into account, and the criterion can be adopted to identify the breakup operation state effectively. The result of EMTP simulation indicates that in a paratactic doublecircuit line the differential current adjusted in the same phase of doublecircuit line is less than the integral one, under nonfull phase operation state, once the doublcircuit line is broken up, the differential current adjusted in the same phase of doublecircuit line is more than the integral one. The technique ensures it against the erroneous judgment.更多还原