Insulation Defect Detection of Solid Insulating Material Based on Nanosecond Pulse Voltage

In this paper, a partial discharge detection platform with repeated frequency nanosecond pulse voltage is built. Its output voltage is 30kV, the pulse front is 100ns, the half-width of the voltage is 120ns, and the maximum repetition frequency is 10 kHz. Under the excitation of nanosecond pulse voltage, the defects in the test sample produce partial discharge, the number of partial discharge is consistent with the number of applied pulses, the repeatability of discharge is good, the discharge quantity and the initial discharge voltage are easy to be counted, the partial discharge parameters are easy to be extracted. Under continuous pulses excitation, the development of defect of the sample can be judged by the change process of the discharge amount. Therefore, the nanosecond pulse voltage can be used to detect the insulation defect of the sample, and it is helpful to study the destruction process and mechanism of the solid insulating material under partial discharge.