Research on comprehensive detection method of induced electric-magnetic coupling resonance for fault of mining underground cable
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Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao 125105, China

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TN06; TH85+3

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    Abstract:

    A power cable failure in a mine with high-concentration gas has caused coal mining machines and other equipment to stop operating, severely affecting production efficiency and economic benefits. Currently, commonly used methods for detecting cable faults on the ground, such as the high-voltage pulse flash over method and the traveling wave reflection method, are not suitable for underground detection environments.Therefore, this paper proposes a comprehensive detection new method for underground mining cable faults based on induction electric field-magnetic coupling resonance. A mathematical model for a comprehensive cable fault detection method based on induction electric field-magnetic coupling resonance under low-frequency sinusoidal excitation conditions is established. Using multiphysics simulation software COMSOL, the electromagnetic field quantities are solved for open-circuit and short-circuit faults in the cable, resulting in the two-dimensional distribution of electric and magnetic field strengths, as well as the one-dimensional curve of the detection coil voltage. Simulation and experiments have determined the variation curves of the induced voltage with the lift-off height when the used coil is in open-circuit and short-circuit conditions. Research results show that the comprehensive method based on low-frequency induced electric field-magnetic coupling resonance is feasible for underground detection of mining cable faults. Under the excitation with an amplitude of 1 ~ 20 V and a frequency range of 1 kHz~20 MHz, by detecting along the cable at the same lift-off height, open-circuit and short-circuit faults of the cable within one-tenth of the excitation wavelength in length can be detected. It provides an effective method for underground detection of coal mine cable faults and product development.

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  • Received:
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  • Online: April 23,2025
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