消除同走廊线路互感影响的输电线路单端故障测距方法

摘要

Based on lumped parameter model, an one-terminal fault location method for transmission lines in hybrid corridor with single circuit line is presented. The proposed algorithm uses cascade voltage source on faulty line as an equivalent of the influence of mutual inductance of adjacent lines. Then the superimposed system is dismounted using the superposition theorem. According to the analysis of the complex sequence networks, the relationship among sequence-currents in each system and the relationship between measured current and fault point current are derived. Combining with the solution formula of the sequence current on the fault point, the fault location equation eliminating the influence of mutual inductance of adjacent lines is derived. This method uses one-terminal data and eliminates the influence of transition resistance. Simulation results show that the proposed fault location method has a satisfactory precision.%基于集中参数模型,提出了一种同走廊输电线路单回线故障的单端测距方法.该方法将邻近回线的互感影响等效为故障回线上串联的电压源,再利用叠加定理将系统进行分解.通过对各分系统进行复合序网分析,得出了各分系统中各序电流之间以及测量处电流与故障处电流之间的关系;结合故障处序电流的求解公式,最终推导出消除邻近回线互感影响的故障测距方程.此方法仅需单端测量数据,且消除了过渡电阻的影响.仿真表明,其具有较高的精确度.