摘要
短路电流计算是送电线路通信保护设计的重要环节。当中性点直接接地的高压送电线路发生单相接地短路故障时,突变的电流产生的强大电磁场会在邻近的通信线路上感应出纵电动势,对通信设备造成危险和干扰影响。为计算短路电流,在通信保障设计中可以采用对称分量法进行简化计算,通过矩阵的变换,逐步推导出1个计算短路电流的实用公式,并用计算实例验证了该计算公式的正确性。
The calculation of shot-circuit current is an important link for power line communication protection design. When a single- phase grounding fault occurs on high voltage transmission line with neutral directly grounding, the strong electromagnetic field caused by a mutation of current induces longitudinal electromotive force on the nearby communication line and has interference effect on communication device. In order to calculate the short circuit current, symmetrical component method can be used to simplify the calculation in the eommunication line protection design. This paper deduces a practical formula for calculating the short-circuit current through matrix transformation. In the end, the correctness of the formula is verified by calculation examples.
出处
《陕西电力》
2013年第10期84-86,共3页
Shanxi Electric Power
关键词
通信保护
对称分量法
短路电流
communication protection
symmetrical component method
short-circuit current
