This paper mainly discusses subjects such asprocessing,technology of pole coil wind ing,forming,manufacturing lead,punching,dove-tail groove,insulating,heat pr essing,encircling slot,etc.
Insulance Ohmmeter, Model ZC25, can be used to measure insulation resistance of various electrical machinery, telecommunication element, household appliances and teaching electrical equipment.
The material is pervaded with va rious performances of light weigh so und absorption,heat preservation,insulation,hig h-temperaure resistance,corrosio n resistance,noninflammability an d antibiosis.
Grounding and its notices were probed into construction of trolley isolative wire. How to eliminate safe hidden troubles in construction was discussed also.
Multiple reignition makes the frequency and amplitude of overvoltage increase and might do harm to transformer coils by cumulative effects for its surge steepness.
Early electrical workers used it as a coating to insulate coils, and molded it into stand-alone insulators by pressing together layers of shellac-impreg-nated paper.
Widely used in industry, it is high-temperature-resistant, noninflammable, fairly electric insulated and has good affinity to the metal surface, fibre, rubber and plastics etc.