对于单回线杆塔，中相串的单片绝缘子承受最大电压值比边相串高；
The maximal withstand voltage of single insulator for the middle string of single circuit tower is more than the side string.
相电流差突变量选相元件在单回线故障中具有良好的选相性能，但在同杆双回线跨线故障中可能误选相。
Although fault component current phase selector has excellent performance for single transmission lines, it may select unwanted phase for cross-country faults in double-circuit lines on a same tower.
通过严格的理论推导，论证了自适应电流速断保护不仅适用于单回线运行方式，同样适用于双回线或环网运行方式。
Strict theoretical deduction shows that adaptive current fast - tripping protection can be used not only on single - circuit line, but also on double - circuit line.
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。
This method can be used to specify the cross-phase fault and single line fault of the parallel line as well as cross-pole fault.
提出了一种基于同杆双回线单端电流量的故障测距方法。在故障状态下，双回线可以分解成同向网和环流网，其中环流网只与双回线有关，且两端电压为零。
The method for fault location of the parallel transmission lines on the same tower based on single-terminal current is proposed in this paper.
提出了一种基于同杆双回线单端电流量的故障测距方法。在故障状态下，双回线可以分解成同向网和环流网，其中环流网只与双回线有关，且两端电压为零。
The method for fault location of the parallel transmission lines on the same tower based on single-terminal current is proposed in this paper.
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