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This paper compares three winding wires commercially available for operating at high-temperatures. These wires are stressed by thermal constraints in the temperature range of 20-500°C. The insulation resistance, the tan δ, the parallel capacity and the behaviour under AC voltage strength are quantified with the temperature. The curvature radius, which becomes crucial for inorganic insulated wires, is examined. The detailed comparison between the three wire types assist the appropriate choice of insulated wires for future high-temperature applications.

This paper aims to present and analyze the materials adapted to design a machine that can work with a high current density without any specific cooling system. In other words, the machine is equipped with material that supports high internal temperature, about 500°C. Candidate materials are selected and the authors indicate that inorganic insulation should be preferred for conductors and slot insulations. Tests are carried out on material selection through measurement of the turn-to-turn voltage, insulation resistances, and the parallel capacitances.