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多分支、小接地电流的配电线路故障测距有其固有特点和困难 ,多年来未能圆满解决。基于 RL C全分布的分布参数线路模型 ,借助多频激励故障诊断思想 ,提出了辐射状馈线故障测距的双频激励和测后模拟法 ,这两种方法可有效地对配电线路进行故障分支识别和短路点定位。文中给出了算法的推导 ,以及测距结果关于输入误差灵敏度分析结果。三年多来 ,在大庆实际配电线路上的多次模拟故障测距表明 ,此方法正确。
Multi-branch, small ground current distribution line fault location has its inherent characteristics and difficulties, failed to satisfactorily solve over the years. Based on the distribution model of RL C full distribution parameters, a dual-frequency excitation and post-simulation method based on multi-frequency excitation fault diagnosis is proposed. The two methods can effectively fault the distribution line Branch identification and short-circuit point positioning. The paper gives the derivation of the algorithm, as well as the result of the distance measurement sensitivity analysis on input error. In the past three years, the multiple simulated fault location on Daqing actual distribution line shows that this method is correct.