Mine grounding systems: Evaluation of in-mine grounding system and codification of ground bed construction and measurement techniques. Annual report 16 October 1976-30 June 1977

Technical Report · Wed Nov 16 00:00:00 EST 1977

OSTI ID:6244228

Cooley, W L

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, but 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. Additional ground-check monitor testing is reported.

• Research Organization: West Virginia Univ., Morgantown (USA)
• DOE Contract Number: G0144138
• OSTI ID: 6244228
• Report Number(s): PB-286120
• Country of Publication: United States
• Language: English

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