Influence of Mica Tapr Application on Insulation Characteristice of High Voltage Rotating Machinery Coils

This paper studies the influence of mica tape application methods on the insulation characteristics of HV rotating machinery coils generally. Resin impregnability , electrical failure properties and mechanical properties were tested on specimens prepared by sheets or tapes with different widths. From these test results, it was clarified that these insulation characteristics were influenced significantly by the mica tape application methods. This influence was caused by resin impregnating the interfaces between the mica tapes and thus weakening the resistance of the tape to electrical and mechanical stresses.