UHF partial discharge and location measuring device for high-voltage power devices

A UHF partial discharge and location measuring device for high-voltage power devices, the device comprising:

• a partial discharge sensor attached to a Device Under Test (DUT) to detect a partial discharge signal;
• an external noise sensor located outside the DUT to detect an external noise signal;
• an analogue-digital converter that receives a partial discharge signal from the partial discharge sensor and an external noise signal from the external noise sensor and digitalizes the received signals;
• a peak detector that extracts a peak value of the digitalized signal for each sensor;
• a partial discharge signal processor that generates a peak signal for a phase and time of a power signal applied to the DUT, density of the peak signal for the phase of the power signal applied to the DUT, and a long-term variation in trend of the partial discharge signal from the extracted peak value for each sensor;
• an arrival time detector that detects a start point of the partial discharge signal and detects an arrival time;
• a discharge location processor that yields a discharge location from a location coordinate where the partial discharge sensor is positioned and the arrival time and performs a statistical process on the yielded discharge location according to a number of yield times;
• and
• a display unit that displays the peak signal, the density, the variation in trend, and the discharge location.