Characterization of PDIV, PDEV, and RPDIV in Insulated Wires Under Unipolar Repetitive Square Wave Excitations for Inverter-Fed Motors

The behaviour of partial discharge inception voltage (PDIV), extinction (PDEV) and repetitive (RPDIV) as a function exposure/poling time under unipolar square wave excitations at atmospheric pressure (1013 mbar) is experimentally measured investigated. (PD) tests are performed on two commercially available insulated wires: Glass fibre Type II Polyether Ether Ketone (PEEK) I wires used in inverter-fed motors. impact excitation polarity, pulse repetition frequency rise the PD quantities (i.e., PDIV, PDEV RPDIV) studied stressing duration. In addition, trend RPDIV PDIV dispersion levels compared poling positive negative with times 80 800 ns) frequencies 50 Hz 2.5 kHz), relying shape/slope parameter Weibull distribution. collected data shows that electric field induced by interface charge deposited occurring during consecutive pulses space accumulation insulation bulk plays decisive role quantities’ variations excitations.