A modified method of testing thermal endurance of winding wires

The present paper covers a test procedure for the evaluation of thermal endurance of enamelled wires at constant voltage. In the NEMA Magnet Wire Technical Committee Presentation of 19711 it was proposed in clause 7 of “Additional work recommended” of the “Joint Sections Committee Report” to develop meaningful test methods for voltage endurance of magnet wire at elevated temperature. In the EIC 1971, the author presented a paper on statistical analysis applied to data obtained by IEEE 57.² In the conclusion of this paper, recommendations for test development for magnet wire evaluation incorporating voltage and temperature were given. This paper proposes such a test method.