关键词: 竹线触碰故障, 山火, 等效阻抗模型, 高频信号, 故障特征

Abstract: When the bamboo wire touch fault occurs in the low-voltage side of the distribution platform area, it is very easy to produce discharge, and there is a risk of causing hill fire, so fast and accurate identification of bamboo wire touch fault is an important means of preventing hill fire. Based on this, this paper builds a 380 V/220 V low-voltage bare wire-bamboo touch fault simulation experimental platform, establishes the equivalent resistance model of the bamboo touch single-phase conductor faults, through the experiments show that, in the equivalent resistance prediction model range of the bamboo touch single-phase conductor faults with low leakage currents, there is almost no possibility of starting a hill fire. The whole process of line phase-to-phase discharge breakdown and fire caused by a two-phase conductor clamped bamboo fault is reproduced, and a fault signal feature extraction method based on the slope statistic of the high-frequency signal is proposed. The characteristics of the bamboo line touching fault are characterized by the high-frequency discharge energy change, and its effectiveness is verified by experimental data.

Key words: bamboo wire touch fault, hill fire, equivalent impedance model, high frequency signal, fault characterization