Preliminary evaluation of CR Kapton(R) backed mica paper tape for high voltage coil groundwall insulation using vacuum-pressure-impregnation

Of interest, is to find a mica paper tape with higher dielectric properties than commercially available tapes. This paper presents the results of a preliminary evaluation of Corona Resistant (CR) Kapton^(R) backed mica paper tape. These tapes were evaluated for possible use for high voltage coil groundwall insulation using vacuum-pressure-impregnation (VPI) with epoxy resins. CR Kapton^(R) Mica Paper tape was used to insulate 3 aluminum test bars and impregnated with epoxy resin using a VPI process. The impregnating resin and process is used in the fabrication and processing of high voltage stator coils usually insulated with glass backed mica paper tape. An evaluation of the insulated test bars was done and the results are compared to other commercially available glass backed mica paper taped test bars; processed and evaluated under identical conditions. This paper reviews the results of the evaluation of CR Kapton^(R) tape; showing good dielectric properties which could make it suitable for use in high voltage coil insulation