IEEE Transactions on Industry Applications · 2008 · 53 citations · 16 references
EngineeringElectrical EngineeringMining EngineeringGeomagnetismMine AutomationUnderground MiningElectrical MeasurementElectrical System DiagnosticsElectrical System TestingElectromagnetic MethodsFault DetectionFault DiagnosisCurrent-based Fault DiagnosisElectromagnetic Transient SimulationFault LocationGround Fault DetectionGround Fault IdentificationGround Resistance MeasurementTransient Electromagnetic FieldsTransient Electromagnetic Simulation
Mine power systems often have floating neutrals or high‑resistance grounding, limiting earth‑fault currents to a few tens of amperes, which makes conventional zero‑sequence current detection methods poorly sensitive. The paper proposes a fault‑detection scheme that measures fault current and fault resistance to detect high‑impedance ground faults. The scheme measures both fault current and fault resistance to identify high‑impedance ground faults. Simulation and laboratory prototype testing confirm that the scheme is highly sensitive and robust.
Many mine power systems operate with a floating neutral or are high-resistance grounded, and earth fault current is no more than a few tens of amperes. Traditional earth-fault-detection methods based on zero-sequence current have poor sensitivity in this case. For improvement, a fault-detection scheme with fault-current and fault-resistance measurement is presented in this paper, which is capable of detecting high-impedance ground faults. The scheme has been verified by electromagnetic-transient-program simulation, and a fault-detection prototype has been developed and tested in the laboratory. Results show that the scheme has high sensitivity and robustness.
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