Modulation of partial discharge activity in GIS insulators by X-ray irradiation

Author

Braun, J.M. ; Rizzetto, S. ; Fujimoto, N. ; Ford, G.L.

Author_Institution

Ontario Hydro Res., Toronto, Ont., Canada

Volume

26

Issue

3

fYear

1991

fDate

6/1/1991 12:00:00 AM

Firstpage

460

Lastpage

468

Abstract

A system was assembled which can perform high-sensitivity partial discharge (PD) measurements under combined electric stress and X-ray irradiation on 138-kV class gas-insulated switchgear (GIS) post insulators. Under X-ray irradiation, the PD pulse repetition rate is increased and the discharge inception voltage (DIV) is sharply reduced. The DIV of these insulators under X-ray irradiation was recorded at values at low as 25 kV, although some samples could not be brought into discharge at 400 kV without X-rays. The modulation effect of X-rays on PD activity permits the location of the discharge side. In general, pulse-height and pulse-phase patterns are more tightly clustered with X-ray irradiation, but the patterns display a board range of features depending on the type of defect, voltage, and time on voltage

Keywords

X-ray effects; gaseous insulation; insulators; partial discharges; switchgear; 138 kV; X-ray irradiation; discharge inception voltage; electric stress; gas-insulated switchgear; insulators; modulation effect; partial discharge activity; pulse repetition rate; pulse-phase patterns; Assembly systems; Electric variables measurement; Fault location; Gas insulation; Geographic Information Systems; Partial discharge measurement; Partial discharges; Performance evaluation; Stress measurement; Voltage;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.85118

Filename

85118