Premium
Noncontact detection of electromagnetic noise occurrence due to partial discharges by spatial phase difference method
Author(s) -
Kawada Masatake,
Kawasaki ZenIchiro,
Matsuura Kenji,
Kawasaki Makoto
Publication year - 1997
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/(sici)1520-6416(199703)118:4<20::aid-eej3>3.0.co;2-p
Subject(s) - partial discharge , noise (video) , acoustics , signal (programming language) , electromagnetic radiation , dielectric , voltage , position (finance) , phase (matter) , materials science , power (physics) , electromagnetic noise , physics , optics , electrical engineering , optoelectronics , engineering , computer science , quantum mechanics , artificial intelligence , image (mathematics) , finance , economics , programming language
A new method for detecting the occurrence of partial discharge (PD) in a high‐voltage electric apparatus due to a dielectric material defect is presented. This method uses the phase difference of electromagnetic signals emitted through space. The time delay of the signals at two points is estimated. From this, the time delay of the PD and the originating position can be determined. When the electromagnetic wave due to an internal PD is to be measured and an electric power apparatus has a dielectric defect, the mean power of the background noise is normally higher than that of the signal of interest and the signal tends to get lost in the background noise. This paper shows experimentally that the proposed method can be applied to identify the electromagnetic waves emitted from the PD. This method is shown to be useful for detecting and predicting an insulation material defect. © 1997 Scripta Technica, Inc. Electr Eng Jpn. 118 (4): 20–26, 1997