Abstract
Electromagnetic interference (EMI) due to partial discharges (PDs), which occur at the rubber coatings or the strain insulators of outdoor distribution systems, might cause poor television reception in neighboring housing. It is difficult to identify the EMI with a visual check because the PDs rarely generate light and sound.
We investigate fundamental characteristics such as identifying the direction of a PD source using the time difference between two antennas, and an analog hardware system for calculating the direction from that time difference. The analog system is composed of IC devices such as a filter and a mixer, and also uses signal- processing of intermediate frequency transforming. We confirm the validity of the relationship between the direction of a PD source and the time difference between two antennas, and also confirm the application of a surface acoustic wave (SAW) filter in the analog hardware system. We measure the pulse response of multiple devices, and estimate the linearity between the direction of a PD source and the outputs of multiple devices.
