Frame-by-frame measurement and recording of DC partial discharge under different ramp excitations

This study presents a comparatively low-cost measurement system for recording, extracting, and processing partial discharge in a dielectric insulation material sample. The purpose of the measurement is to combine developed measurement tools and equipment through a method of synchronisation to capture partial discharge pulses, under direct current or unipolar excitation, in real-time with accurate timing information. A coupling capacitor-based detection method is used for measurement. Each partial discharge event was captured on a single oscilloscope frame and exported in a synchronised order. Results showed that sufficient resolution can be captured for all partial discharge events, where the trigger threshold is selectable.