关键词: 电力系统, 自闭/贯通线路, 中性点非有效接地, 行波, 特征分析

Abstract: Neutral noneffective grounding model is adopted in 10 kV automatic blocking and continuous power transmission line with long distance and badly corridor environment. Fault (especially to singlephase earth fault) occurred frequently, which was difficult to detect in the lines. In order to solve the fault location problem, this paper analyzes the electric structure of automatic blocking and continuous power transmission line, investigating the transient characteristics of traveling waves generated by different fault in the lines on the basis of traveling wave theory. The results show that transient process of earth fault and short fault in neutral noneffective grounding systems produce aerial mode component of traveling waves with steadyparameters. Transmission rules of traveling waves among the lines and reflection rules in the lines' end are analyzed in detail. The work in this paper offers the theory basis for the fault location using traveling waves in automatic blocking and continuous power transmission lines.

Key words: automatic blocking and continuous power transmission line, neutral non-effective grounding, traveling waves, characteristic analysis , electric power system