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EN
The majority of failures of interturn insulation system of inverter-fed motors are attributed to partial discharges therefore determining of Corona Inception Voltage (CIV) is essential. However the investigation of CIV under pulse voltage leads to problems and some researchers performed the alternative of measurements using sinusoidal voltages. In this paper the simple way of determining of CIV of enamelled winding wires under high frequency pulse voltage with oscilloscope has been shown. The dependence of Corona Inception Voltage versus kind of enamel, insulation thickness, frequency of pulse voltage and temperature has been presented. It was found that mainly thickness of insulation and temperature influences on the level of voltage at which partial discharges has begun. The obtained CIV results were verified by testing of endurance of insulation under pulse voltage.
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