Verification of the detection of partial discharges by microwaves

Author

Kawada, Masatake ; Kawasaki, Zen-Ichiro ; Matsu-ura, Kenji ; Nishimura, Akira ; Tokura, Hideki ; Okada, Iwao

Author_Institution

Dept. of Electr. Eng., Osaka Univ., Japan

fYear

1995

fDate

17-20 Sep 1995

Firstpage

311

Lastpage

314

Abstract

This paper presents a new method for detecting an occurrence of a partial discharge (PD) due to a material defect in a high-voltage electrical apparatus. This method which is based on the interferometer in the field of astronomy, can detect a source of discharge by using the phase information of electromagnetic waves propagated through space. In the case that the electromagnetic wave due to an internal PD of an electrical power apparatus is to be measured in operation, the signal to noise ratio poses a problem to discuss. The background noise level is normally higher than the signal level of interest, and the signal tends to be lost in the background noise. This paper experimentally shows that our proposed “Spatial Phase Difference Method (SPDM)” is able to be applied to detection of electromagnetic waves caused by PD

Keywords

electromagnetic wave interferometry; insulation testing; microwave measurement; partial discharges; electromagnetic waves; high-voltage electrical power apparatus; interferometry; material defects; microwave detection; partial discharges; signal to noise ratio; spatial phase difference method; Astronomy; Background noise; Electric variables measurement; Electromagnetic propagation; Electromagnetic scattering; Extraterrestrial measurements; Fault location; Partial discharges; Phase detection; Power measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials, 1995. International Symposium on

Conference_Location

Tokyo

Print_ISBN

4-88686-047-8

Type

conf

DOI

10.1109/ISEIM.1995.496571

Filename

496571