. Journal of electricity . ilures of equipment, the principles being applicable of course to electric drivein any service. The author, now a consulting engineer, was formerlv electrical engineer forthe Goldfield Consolidated Mines, Nevada.—The Editor.) Successful operation of electric drive equipmentis chiefly a matter of preventing trouble. It is offirst importance that the number of failures andalso the total time lost be kept to a minimum, andyet it is peculiarly difficult to prevent failures insuch service. The number of failures is, of course,dependent upon the severity of the conditions,
. Journal of electricity . ilures of equipment, the principles being applicable of course to electric drivein any service. The author, now a consulting engineer, was formerlv electrical engineer forthe Goldfield Consolidated Mines, Nevada.—The Editor.) Successful operation of electric drive equipmentis chiefly a matter of preventing trouble. It is offirst importance that the number of failures andalso the total time lost be kept to a minimum, andyet it is peculiarly difficult to prevent failures insuch service. The number of failures is, of course,dependent upon the severity of the conditions, butalso varies directly with the number of hours in serv- These are veiy readily repaired when found, but areoften very puzzling to find and for this reason maycause several hours delay. They are important alsobecause they sometimes result in motor burn-out byleaving the motor running Equipment and PartsIt is good practice to carry spare motors for allsmall motors, up to 100 hp., and a complete set of. The two tube mill motors, Allis-Chalmers 200 hp., at the Goldfield Consoli-dated mill. The average load is about 220 hp., and the motor at the lefthas operated for eight years continuously without trouble. ice, and it is to be remembered that most mill motorsare in service 24 hours per day and every day in theyear. It is difficult to give proper care when motorscan be shut down only upon permission of the menwhose duty it is to get the maximum production,and it is difficult to make proper repairs under thestress of hurry to get going again. At Goldfield, failures averaged four or five permonth out of about 110 motors connected. Of these,only about one in four was a shop job, that is, soserious that the motor was sent to the shop for re-winding. This number of failures is high, due to thefact that most of these motors were old and hadbeen several times repaired. In good average prac-tice, with modern equipment, half this number maybe expected. Failures in sta
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectricity, bookyear
