The unit is composed of hydraulic and double conic placing,hydraulic spading and drawing ,straightening,shearing,end stopping,coiling,feeding,dropping cart,ect.
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.
Phragmoplast of coil coating has been prepared by free radical polymerization and by using acrylic acid,methyl methacrylate,butyl acrylate as the raw materials.
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.