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针对T型线路中出现同杆双回线的线路结构,提出了判定故障分支的新方法。该方法以六序分量法为基础,当某支路发生故障时,首先求取各支路保护安装处的突变电气量,然后通过正序网络图,计算2个必要的参数用于判别故障支路,区分非同杆双回线故障、同杆双回线的跨线故障,以及同杆双回线的单回线故障。该方法的特点是考虑了同杆双回线的跨线故障,能够确定同杆双回线中的单回线的故障回路以及跨线故障,并且物理意义明确。序电流可以用来区分同杆双回线的同名相跨线故障。同时,进行了大量的EMTP仿真,结果表明支路判断的准确度不受系统运行方式、故障点过渡电阻等因素的影响,并且也能很好地适用于不对称同杆双回线路。
Aiming at the line structure of T-line with the same double-circuit line, a new method to judge the fault branch is proposed. The method is based on the six-sequence component method. When a branch fails, the abrupt change of electrical quantity of each branch is firstly calculated and then two necessary parameters are calculated through the positive sequence network diagram to determine the fault branch Road, to distinguish between non-double-line fault on the same pole, double-line with the same line over the line failure, and double-line single-line fault line. The method is characterized by taking into account the cross-line fault of the double-circuit line on the same tower, capable of determining single-loop fault circuits and cross-line faults in the double circuit lines on the same tower, and having a clear physical meaning. The sequence current can be used to distinguish the double-line line with the same name of the same name across the line fault. At the same time, a large number of EMTP simulations were performed. The results show that the accuracy of branch judgments is not affected by system operation mode, fault transition resistance and other factors, and can also be well applied to asymmetric double-circuit lines.