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Mining Publication: Detrimental Effects of Capacitance on High-Resistance-Grounded Mine Distribution Systems
Keywords: Electrical equipment Electrical measures Electrical safety Modeling Power cables
Original creation date: September 2006
Authors: J Sottile, SJ Gnapragasam, T Novak, JL Kohler
Peer Reviewed Journal Article - September 2006
Download PDF Document (3.33 MB)
NIOSHTIC2 Number: 20031043
IEEE Trans Ind Appl 2006 Sep-Oct; 42(5):1333-1339
Modern underground coal mines can be very large, having a total connected load in excess of 15,000 hp. These, mines generally have many miles of high-power conveyor belts and 15 or more miles of high-voltage power cables at distribution voltages of 12.47, 13.2, 13.8, or 14.4 kV. The shielded cables used in mine power distribution systems have a significant level of capacitance, on the order of 110 pF/ft. This level of capacitance, in an extensive power distribution system at today's voltage levels, can cause significant charging currents during a ground fault. This paper addresses the potential detrimental effects of capacitance charging currents during line-to-ground faults in mine power distribution systems. A representative mine power system is modeled, and simulations with faults at various locations are conducted to evaluate the effects of this capacitance on the level of fault current and relay selectivity. This paper also includes results of capacitance measurements made on mine power feeder cables used to validate the simulation model.
Image of publication Detrimental Effects of Capacitance on High-Resistance-Grounded Mine Distribution SystemsPeer Reviewed Journal Article - September 2006
Download PDF Document (3.33 MB)
NIOSHTIC2 Number: 20031043
IEEE Trans Ind Appl 2006 Sep-Oct; 42(5):1333-1339
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Experimental and Modeling Investigation of the Effect of Ventilation on Smoke Rollback in a Mine Entry
Investigation of Ampacity Derating Factors for Shuttle Cars Using Fiber Optics Technology
Modeling and Data Analysis of 50 to 5000 kHz Radio Wave Propagation in Coal Mines
Practical Risk Assessment Guidelines for Identifying, Assessing, and Mitigating Stored Energy Hazards in Underground Coal Mines During and After a Mine Emergency
Reservoir Engineering Considerations for Coal Seam Degasification and Methane Control in Underground Mines
Understanding and Quantifying Arc Flash Hazards in the Mining Industry
Variation of Horizontal Stresses and Strains in Mines in Bedded Deposits in the Eastern and Midwestern United States
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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