Ground fault and overcurrent protection criteria for coal mine AC distribution systems. Open file report August 1979-October 1980
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.
- Research Organization:
- Ketron, Inc., Wayne, PA (USA)
- OSTI ID:
- 5626721
- Report Number(s):
- PB-82-137001
- Country of Publication:
- United States
- Language:
- English
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