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Mine Grounding Systems: Evaluation of In-mine Grounding System and Codification of Ground Bed Construction and Measurement Techniques.

Cooley-WL

NTIS: PB 286 120 Available for Reference At Bureau Libraries :267 pages

10001174

Several aspects of mine safety grounding systems and equipment are studied. Electrolytic corrosion of test ground beds has shown a high incidence of stray current damage, while efforts to build a reliable continuous ground bed monitor continue. Laboratory and field investigations of trailing cable splices have yielded strong evidence that splices can contribute to stray current problems in the mines, and a method is suggested for discovering deteriorating splices before they pose a serious hazard. A prototype device has been constructed to evaluate the electrical resistance of rail bonds underground as a source of stray current. Theoretical modeling of ground electrodes has advanced considerably, now covering measurements of large cylindrical electrodes, multiple-rod ground beds, rod electrodes in stratified earth, and measurement of connected beds. A prototype instrument design is given for a potential gradient plotter to quickly evaluate voltage gradients near earth electrodes.

19770101

CP; Final Contract Report;

1977

PB-286120

A13

OFR 101-78

PRC;

NTIS: PB 286 120 Available for Reference At Bureau Libraries

WV;

West Virginia University