基于故障区域快速识别的混合线路故障测距新原理

Novel fault location algorithm for mixed lines based on fault section fast identification

提出一种基于故障区域快速识别的架空线-电缆混合线路故障测距新原理。根据故障区域识别函数在线路连接点的相位特征判断故障区域,进而利用混合线路正序测距方程推算得到的故障距离表达式在故障线路段上进行精确测距。该算法无需判断故障类型,在线路连接点附近故障区域识别无死区,测距过程无需迭代搜索和伪根识别,计算量小,易于编程实现。仿真测试表明,新算法不受故障位置、过渡电阻和负荷电流等因素的影响,满足工程对测距精度的要求。

A novel fault location algorithm for overhead-cable mixed lines based on fault section fast identification is proposed. The fault section is determined according to the phase characteristics of fault section recognition function at the line connection points, and then the fault distance on the fault section is calculated precisely by using the fault distance expression deduced by the positive-sequence fault location equation of mixed lines. The proposed algorithm does not need to judge the fault type, it has no dead-zone when the fault section is near the line connection points. No iterative search and pseudo-root recognition are required during fault location, and the proposed algorithm has small calculation amount and is easy to be programmed. Simulative tests show that the proposed algorithm is not affected by such factors as fault location, transition resistance and load current, and satisfies the engineering requirements for accuracy.