Abstract
Upgraded three-dimensional electromagnetic analysis allows us to calculate the output of the PD-detecting coupler with a dimension of voltage, which can newly propose analytical sensitivity lines for the accurate calibration of partial discharge (PD) instead of experimental ones obtained by the synchronous measurement between UHF method and IEC 60270 standard. Consequently, the fundamental research point out that the actual charge of PD can be estimated from the output of the PD-detecting coupler under regulated conditions of two types of PD sources for the first time since our previous paper was submitted. Introducing the analytical sensitivity line based on the actual charge reveals that the apparent charge obtained by the experimental sensitivity line might be underestimated compared to the actual charge, even if the measurement principle of IEC 60270 is followed. Therefore, the newly-developed calibration technique combined with the actual charge has a significant impact on accurate estimation of the magnitude of PD even from the electromagnetic wave in VHF/UHF/EHF ranges rather than the displacement current based on IEC 60270 standard.
