Research on Detection Method of PD Detection with Special-shaped Wave

PD detection technology is an important method to judge the insulation performance of equipment. In this paper, four special-shaped waves are designed to detect PD signals in a laboratory environment. Arbitrary signal generator, high-voltage power amplifier, high-frequency voltage divider, protective impedance, coupling capacitor, Rogowski coil, data acquisition card and PC are used to build a special-shaped wave PD electric detection system. In order to study the PD characteristics of typical defects under special-shaped waves, the voltage of specialwave and power AC voltage are applied to the burr defect model, respectively. And the PD characteristics under special-wave voltage and power frequency voltage are compared and studied. Compared with power frequency AC voltage, PD is more easily induced at defective sites under special-shaped waves voltages, and detection of PD is more sensitive; multiple-polarity transitions can be obtained under special-shaped wave voltages, which stimulate multiple discharges.