A method for testing leakage current in a combined low-voltage power supply system for mining applications

Abstract

This application relates to the general field of electrical variable measurement technology, specifically to a leakage current testing method for a mine-use combined low-voltage power supply system. The method includes: slicing a data sequence collected within a preset time period to obtain multiple sub-sequences corresponding to slice windows; performing feature extraction on the sub-sequences corresponding to each target circuit in operation to obtain the system characteristics of the mine-use combined low-voltage power supply system within the slice window; determining a target scene based on the matching results of the system characteristics of the slice window with multiple preset scene features; performing theoretical capacitance current separation on the zero-sequence current contained in the sub-sequences of the circuit based on the target scene to obtain the residual current at each sampling point in the sub-sequences of the circuit; and determining the leakage current test result of the mine-use combined low-voltage power supply system within the slice window corresponding to the sub-sequence based on the changing trend of the residual current in the sub-sequences of the circuit.

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