Insulation system for internal connectors in gas cooled turbine generators

From this series of test bars. the following conclusions regarding phase lead insulation have been drawn: 1. A silicone rubber insulation system comprised of the molded tape and paste combination exhibits good insulation properties even when subjected to as much as twice normal operating temperatures. 2. A silicone rubber insulation system comprised of self fusing tape deteriorates under heat and bulges when continued by protective glass tape. 3. Asphalt mica tape used as connection insulation indicates internal heating as demonstrated by dielectric tests. 4. Epoxy mica tape, although losing some of its binder when overheated, remains relatively unchanged under heat and dielectric tests. When used for field repairs of connection insulation, it can be left to cure under normal machine operating temperatures.