Instantaneous Circuit Breaker Settings for the Short-Circuit Protection of Direct Current 300-and 600-V Trailing Cables

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    Views: (2002)   Date: (Publication Date: July 1981)   Pages: ()
  • Author:  Vilcheck  William S. Fesak  George Helfrich  William J. Mine Safety and Health Administration  Approval and Certification Center  Rural Route 1  Box 201B  Triadelphia  WV 26059.;  

  • Abstract:  Abstract Present Federal regulations which specify maximum instantaneous circuit breaker settings for the short-circuit protection of coal mine trailing cables are discussed. Characteristics of mine power systems, which limit short-circuit current in dc trailing cables, and minimum expected short-circuit currents for dc 300- and 600-V trailing cables are analyzed. New maximum instantaneous circuit breaker settings, based on minimum expected short-circuit currents and typical circuit breaker tolerances, are proposed with emphasis on safety, and tests are cited.

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