Development of a dc current limiting interrupting system for mines. Open file report Jun 79-Sep 81
A switching system for high fault current, 300- and 600-volt dc trolley and haulage systems, as used in the mining industry are 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 actucal current to be interrupted. This system will materially reduce 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 resetting. Electrical and mechanical design principles, that were found satisfactory in field tests, are presented as well as materials for use.
- Research Organization:
- Pittsburgh Univ., PA (USA)
- OSTI ID:
- 6530758
- Report Number(s):
- PB-83-120147
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
24 POWER TRANSMISSION AND DISTRIBUTION
DC SYSTEMS
LIMITER CIRCUITS
DESIGN
MINE HAULAGE
POWER SYSTEMS
MINES
DIRECT CURRENT
ELECTRICAL FAULTS
CURRENTS
ELECTRIC CURRENTS
ELECTRONIC CIRCUITS
ENERGY SYSTEMS
MATERIALS HANDLING
UNDERGROUND FACILITIES
420206* - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)
200302 - Power Transmission & Distribution- DC Systems- (1989-)