Insulation Effects of Hydrogen Gas for Cooling Turbine-Driven Generators

Endurance against surface discharge of epoxy resin and epoxy resin-impregnated mica composites were examined. Voltage endurance properties of epoxy micaceous insulation with open (ventilated) voids and closed voids were examined. Effects of compressed hydrogen gas on creeping discharge suppression were also examined in a high voltage rotating machine winding. Furthermore, thermogravimetric analysis (TGA) was done on epoxy micaceous insulation and wire enamel in an atmosphere of hydrogen, nitrogen, and air. From these test results, advantageous effects of compressed hydrogen gas for cooling turbine-driven generators were clarified.