New Inorganic Insulation for 500 C Electric Equipment

A new completely inorganic electrical insulation system has been developed which is suitable for use at operating temperatures of 500 C (degrees centigrade). Insulation components such as magnet wire, slot cells, phase insulation, and a potting or impregnating compound were developed and utilized in the construction of a 1/2-horsepower (hp) induction motor. The insulation in this motor operated for more than 500 hours at 500 C. Electrical properties of the insulation system as a function of temperature up to 500 C are briefly presented together with suggestions for its application to other types of electric apparatus.