Simultaneous Measurement of Space Charge Distribution and Partial Discharge by PEA Method

In order to improve the efficiency of inverter-driven motors, it is required to prevent partial discharge, and it has been pointed out that PDIV may be lowered during operation due to the space charge that accumulates in the insulation material used to coat the windings. However, there have been few experimental attempts to demonstrate this effect. Therefore, in this study, the effect of space charge accumulation in insulating materials on PD characteristics was verified by the pulsed electroacoustic (PEA) metho. As a result, it was clarified that the space charge accumulation influences PDIV degradation.