A Study on the Estimation of Repetitive PDIV in Twisted Enameled Wires Under Humid Conditions

Le résumé fourni par la source

In response to the demand for reducing environmental impact, inverter-driven motors are increasingly used in industry and mobility. This has raised expectations for higher motor performance and reliability. Recent advances in power electronics have led to higher frequency and faster slew rates of inverter output pulse voltages. As a result, insulation degradation due to inverter surges has become a concern. These surges can trigger partial discharge (PD) within insulation materials used in the motors. PD can degrade insulation and eventually lead to breakdown. To improve the reliability of the motors, understanding PD characteristics under repetitive surge voltages is important. The experimental results showed that repetitive PD inception voltage (RPDIV) decreased as voltage frequency or humidity increased. Additionally, at higher voltage frequency, the effect of humidity on reducing RPDIV was suppressed. The simulation results closely matched the experimental values, validating the proposed computational model.

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