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Ground Fault and Overcurrent Protection Criteria for Coal Mine Ac Distribution Systems.

Authors
Kiefer-JA; Kohler-JL
Source
NTIS: PB/82-137001 :174 pages
Link
NIOSHTIC No.
10002224
Abstract
Ground fault and overcurrent protection criteria for coal mine ac distribution systems were examined by authorization of the Bureau of Mines. The report begins with a literature review that discusses relaying topics including instrument transformers, ground fault pickup methods, static relaying, and comparison of relaying techniques. A chapter on ground fault relaying provides recommendations for maximum and minimum pickup levels as a function of maximum ground current and power system line-to-ground capacitance. Research in the area of phase overcurrent protection has resulted in a complete set of procedural recommendations for the selection and setting of overcurrent relays and current transformers, molded-case circuit breakers, and distribution system fuses in coal mine power systems. The final chapter discusses relay system maintenance and introduces a unique test set that is used to test the performance of relaying systems in coal mines.
Publication Date
19800101
Document Type
CP; Final Contract Report;
Fiscal Year
1980
NTIS Accession No.
PB82-137001
NTIS Price
A09
Identifying No.
OFR 158-81
NIOSH Division
PRC;
Source Name
NTIS: PB/82-137001
Performing Organization
Ketron, Inc.
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