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Impact of current load on mine trailing cable thermal life.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9278, 1991 Jan; :1-11
The U.S. Bureau of Mines has determined a method for calculating coal mine portable power cable thermal life for a specified temperature loading. This work was the culmination of a multifaceted research project involving (1) accelerated life tests of insulation and jacket materials and (2) steady-state and cyclical loading of cables. Composite arrhenius curves were derived for common insulation and jacket materials to identify the key cable quality that precipitates thermal failure. Plots of temperature rise versus current for popular cable sizes were then referenced to develop a correspondence between cable life, based upon thermal degradation, and current loading. Predictions of cable thermal life were made through integration over variable load cycles and, consequently, variable operating temperatures. This procedure may have utility for both the U.S. Mine Safety and Health Administration and mining machine designers in determining the appropriate cable size for new equipment.
Electrical-insulation; Electric-currents; Portable-equipment; Power-lines; Insulated-conductors; Load-impedance; Thermal-degradation; Loading; Mining-equipment; Service-life; Electric-wire
IH; Information Circular
NTIS Accession No.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9278
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division