Capacitance and loss variations with frequency and temperature in composite insulation

VARIATIONS in electrical properties of composite insulation with changes in temperature and frequency are important because they lead to concepts of physical causes of such variations, and therefore indicate how to obtain improved electrical properties in commercial materials. Typical experimental data are presented showing the capacitance and loss characteristics of synthetic resin laminated materials and of imperfect composite dielectrics made from combinations of fused quartz or glass and semi-conducting liquids. An example is given showing agreement between calculated and observed characteristics of such a glass-liquid combination.