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Development of a DC current limiting and interrupting system for mines.
Proceedings of the Sixth WVU Conference on Coal Mine Electrotechnology, Morgantown, West Virginia, July 28-30, 1982. Cooley WL, ed., Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract J0123017, 1982 Nov; :64-79
A switching system for high-fault-current 300- and 600-Vdc mine power systems is presented. The system consists of paralleled main and auxiliary contactor circuits with a liquid metal current limiting device (CLD) in series with the auxiliary contactor. Upon detection of a fault, the current is commutated into the CLD circuit. The liquid metal vaporizes, increasing the CLD resistance and considerably decreasing the actual current to be interrupted. This system materially reduces the wear and tear on contactors because of the reduced interrupting requirement. The CLD is pressurized; when the current is interrupted, liquid metal flows back into the bore. Thus, it is self-resetting. Basic design principles, materials used, and test results are presented.
Mining-industry; Underground-mining; Mining-equipment; Electronic-equipment; Electronic-devices; Electrical-transmission; Electronic-components; Electronic-devices
Proceedings of the Sixth WVU Conference on Coal Mine Electrotechnology, Morgantown, West Virginia, on July 28-30, 1982.
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division