A Partial Discharge Study of Medium-Voltage Motor Winding Insulation Under Two-Level Voltage Pulses With High Dv/Dt
作者： Haoyang You , Han Xiong , Boxue Hu , Jin Wang , Rui Liu
DOI: 10.1109/OJPEL.2021.3069780
关键词: Mechanics 、 Pulse-width modulation 、 Fall time 、 Partial discharge 、 Voltage 、 Electromagnetic coil 、 Fundamental frequency 、 Duty cycle 、 Materials science 、 Modulation index
摘要: Medium-voltage (e.g., 10 kV rated) silicon carbide (SiC) devices have great potentials in medium-voltage variable speed drives. But their high switching dv/dt can increase the voltage stress on motor windings and cause partial discharges. This paper presents a discharge study of form-wound winding under two-level square-wave pulses. A SiC device-based test platform is built to generate pulses with dv/dt. three-step approach proposed employed systematically investigate effects various parameters These include rise/fall time, pulse width, repetitive rate, duty ratio, polarity, fundamental frequency, modulation index. Partial inception voltages (PDIVs) (RPDIVs) sample are measured varied parameters. Test results show that time major affecting factor which reduces PDIVs by 6.5% when it decreases from 800 ns 100 ns. Based results, hypothetical mechanism presented explain fast edges. An empirical equation also derived estimate width conditions.
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