Phase analysis of discharge magnitude distributions inside a small void and its applications to diagnosis of deteriorating insulations

Author

Ito, T. ; Jogan, K. ; Saito, T. ; Ehara, Y.

Author_Institution

Musashi Inst. of Technol., Tokyo, Japan

fYear

1989

fDate

29 Oct-2 Nov 1989

Firstpage

111

Lastpage

116

Abstract

A breakdown phenomenon of electrical equipment due to the deterioration of insulation was investigated. The degree of deterioration or breakdown of the insulating system was predicted from the distribution of induced electric charges inside small voids in an insulator-the discharge magnitude distribution. This distribution was measured by a special internal-discharge pulse measurement system, which analyzes it according to the phase area of the applied AC 50-Hz voltage. This technique was used to investigate tree progression in the microvoid of PMMA (polymethyl methacrylate). The density and the growing speed of the trees are analyzed in terms of the discharge magnitude distributions

Keywords

discharges (electric); electric breakdown of solids; insulation testing; organic insulating materials; polymers; voids (solid); 50 Hz; PMMA; applied AC voltage; breakdown phenomenon; discharge magnitude distribution; electrical equipment; induced electric charge distribution; insulating system breakdown; insulation deterioration; insulation diagnosis; microvoid; phase analysis; polymethyl methacrylate; small voids; special internal-discharge pulse measurement system; tree growth; tree progression; Area measurement; Current measurement; Dielectrics and electrical insulation; Electric breakdown; Electric variables measurement; Electrodes; Needles; Phase measurement; Pulse measurements; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1989. Annual Report., Conference on

Conference_Location

Leesburg, VA

Type

conf

DOI

10.1109/CEIDP.1989.69532

Filename

69532