Badania wpływu zaleśności trwałości oraz napięcia zapłonu wyładowań niezupełnych izolacji przy napięciu impulsowym od jej wymiarów

The phenomena that appear in electrical motors insulation due to pulse voltage coming from inverters can depend on both the pulse voltage parameters as dimensions and characteristics of insulation. The result of investigation of dielectric properties as well durability and PDIV of various models of turn insulation (the twisted pairs and parallel wound helical coils with different number of coils) are presented in this paper. The “size effect” observed by group of Japan researchers under very short pulse duration have been not confirmed in our results under other pulse voltage. Because the size effect could be important for inverter-fed motors, the testing should be performed under pulse voltage that followed the real conditions. Probably the existing standard IEC 62068-1 specifies too extensive parameters of test pulse voltage.