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对同杆双回线的反序电流特性进行了研究,推导出双回线中存在其他支路时反序电流的计算公式及特点。该计算公式可以应用到带有同杆双回线的T形线路的故障支路判断和故障测距,利用反序正序电流计算反序正序电压,并且利用反序正序电压在故障点相等的等量关系进行故障测距。大量的EMTP仿真结果表明,所给出的支路电流与同杆双回线反序正序电流之间的关系是正确的,并且在带有同杆双回线的T形线路故障测距中显示出较大的优势。该测距方法的精度不受故障支路、故障类型、系统运行方式、故障点过渡电阻等因素的影响。
The reverse-sequence current characteristics of the double-circuit line on the same pole are studied. The formulas and characteristics of the reverse-sequence current when there exist other branches in the double circuit line are deduced. The calculation formula can be applied to the fault branch judgment and fault location of the T-shaped line with double-circuit lines on the same tower. The reverse sequence positive sequence current is used to calculate the reverse sequence positive sequence voltage, and the reverse sequence positive sequence voltage is used at the fault point Equal equivalent relationship for fault location. A large number of EMTP simulation results show that the relationship between the branch current and the double-pole reverse-sequence positive sequence current in the same pole is correct. And in the fault location of T-shaped line with double-circuit on the same pole Show a big advantage. The accuracy of the distance measurement method is not affected by factors such as fault branch, fault type, system operation mode and fault point transition resistance.