【摘要】 建立了基于线路分布参数的单相故障零序等效模型,通过分析故障/非故障线路的暂态零序电流,得到了它们的内在特性:在低频段内,故障线路零序暂态电流幅值大于非故障线路的,并且随着故障距离的增加而幅值呈一定规律减小。不同内在特性必然导致不同的外在表现。根据分形维数由信号波形的频谱分布决定的特点,给出了故障选线的RS维数判据和故障定位的RS表达式。与其他方法相比,它的理论模型精确,选线简单,定位精度高,不受CT极性影响,能较好地反映出线路的暂态特性和电流波形特点。大量的仿真试验也证明此方法有效。更多还原

【Abstract】 The zero-sequence model of single phase earth fault is made on the basis of distributed parameter lines. By analyzing the transient currents of fault/normal lines, their inner character are described as follows: the zero-sequence transient current of faulted line is bigger than that of normal lines in the range of the selected line’s low frequency bands, which can reduce regularly when the distance of fault location is creasing. The different inner character must result in different outer behaviors. According to the rule that R/S-dimension could be decided by frequency spectrum analyzing of the signal, the R/S-dimension’s criterion of fault line identification and the R/S-dimension’s formulas of fault localization are given. Compared with other methods, it has a accurate model in theory, and has a simply fault line identification and a fault localization with more precision, which is independent of the CTs’ polarity. The method can adequately depict the transient character of the line and signal traits of the current. The method is testified effectively through series of simulation experiments.更多还原