Statistical evaluation and mitigation of inductive interference problems in portable power cables

Research on 3 years' effort by West Virginia University in the general area of mine electrical power systems is summarized. The first year's work, 1972 to 73, was largely concerned with the analysis of the intermachine arcing problem. The second year's work, 1973 to 74, was largely concerned with ground motives and system grounding. A very small effort was made to determine if certain items of protective equipment used in electric utilities could also be used in mine power systems. In 1974 to 75, a modular ground wire monitor was designed and built. This monitor is capable of being made more or less sophisticated as needed for particular applications. A module based on a phase-locked-loop was conceived and designed. A program on the reliability of mine electrical power system components was begun.