Statistical correlation between partial discharge pulses magnitudes measured in the HF and UHF range

Abstract

Partial discharge (PD) detection using antennas has become a useful technique for condition monitoring of high-voltage equipment. However, one of its main drawbacks is the lack of knowledge for the quantification of the PD magnitudes, which is possible when conventional capacitive dividers or high-frequency current transformers (HFCT) are used. This paper studies a possible relation between PD pulses measured in the HF and RF range. Different types of PD events were measured in the HF range using an HFCT and in the VHF/UHF range using two types of antennas. The peak value and the energy of each PD pulse have been studied for both HF and radio-frequency (RF) sensors, representing them in graphics. In addition, the possible statistical dependence between variables (peak-energy; peak-peak; energy-energy) has also been quantified.