Pattern recognition of typical defects in high-voltage storage capacitors based on DC partial discharge

High-voltage storage capacitors (hereinafter call capacitors for short) have been widely used in pulsed power technology. In accordance with the actual work conditions of capacitors, direct current partial discharge (DCPD) detection was put forward. The whole test system was based on the impedance balance circuit characterized by good configuration and anti-interference ability. Through DCPD detection on capacitors which contained four typical defects respectively, test results revealed that DCPD signals could well reflect the state of capacitor insulation. DCPD distribution spectra of capacitors containing four typical defects were obviously different. Defects in capacitors could be exactly judged by computer-aided pattern recognition based on support vector machine (SVM).