117 / 2016-10-26 20:18:20

Research on single-phase-to-earth fault section location in coal mine high-voltage power supply system

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In allusion to single-phase-to-earth fault location in coal mine high-voltage distribution network, a new scheme of fault location was proposed, which based on abrupt change of zero-sequence current and grid structure matrix using that zero-sequence current amplitude of fault lines is larger than non-fault lines. In this method, through analysis of amplitude change ratio between the fault lines and non-fault lines, and when the ratio is larger than the threshold, fault lines are determined. Fault character vector is designed according to the ratio, and then combine with the grid structure matrix to design fault message character matrix, finally locate the fault zone. The experiment results show that, this method can achieve vertical selective grounding protection of high-voltage power grid of coal mine.