Compatibility of Mica Binder Resins with Medium and High Voltage Impregnation Resins

To process and test high voltage sample bars or full-sized coils of a generator or motor stator, requires an investment of time and expense. If there is a way to break the testing down into small parts using smaller specimens, time and expense could be saved. In this study, samples were prepared using 80% to 90% of epoxy, unsaturated polyester and polybutadiene-impregnating resins with 10% to 20% of various mica binder resins for the test. Multiple studies of these combinations of both resins would be conducted. With the studies of these properties, results should identify a potential screening procedure for the selection of resins prior to the impregnation of high voltage coils or test bars.