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Location of partial discharge in air by detecting phase difference of electromagnetic waves
Author(s) -
Kumazawa Takao,
Hoshino Toshihiro,
Fujii Shigeo,
Maekawa Hiroshi
Publication year - 2008
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20540
Subject(s) - emi , electromagnetic interference , acoustics , interference (communication) , filter (signal processing) , electronic engineering , analogue filter , linearity , electrical engineering , engineering , computer science , physics , digital filter , channel (broadcasting)
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. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 164(3): 27–34, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20540