Sensitive ground-fault protection for mines. Phase III - coordination-free GFR's for AC distribution.
Trutt-FC; Kohler-JL; Rotithor-H; Morley-LA; Novak-T
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, OFR 2-89, 1988 Jan; :1-95
This report concerns the research and development of a coordination- free relay for ground fault protection in mine power distribution systems. The dynamic nature of distribution systems used in coal mines makes it difficult to maintain coordination of the ground fault relays. Excessive clearing times under fault conditions are a direct result of poorly coordinated systems. This results in an increased risk of fire or electric shock. One result of this project is the development and demonstration of a technology that will eliminate the need to coordinate serial ground-fault relays while ensuring that any ground fault is cleared in a minimum amount of time.
Electrical faults; Circuit protection; Mining; Electrical grounding; Electric relays; Power transmission lines; Fires; Risk; Distribution systems; Mine safety
CP; Final Contract Report
NTIS Accession No.
OFR 2-89; Contract-J0134025
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, OFR 2-89
Pennsylvania State University