Aging of stator bars exposed to end arm discharges

Author

Hudon, C. ; Bélec, M.

Author_Institution

Inst. de Recherche, Hydro-Quebec, Varennes, Que., Canada

Volume

2

fYear

1996

fDate

20-23 Oct 1996

Firstpage

829

Abstract

Three of the most common types of end arm discharges occurring during normal operation of air-cooled hydro-generators have been simulated in the laboratory. Sections of stator bars have been modified to induce either surface tracking, corona discharges at the semi-conductive paint/corona suppressor junction, or bar-to-bar discharges. Two setups of each type of defect were subjected to an aging voltage of 20 kilovolts, and discharge measurements were carried out as a function of time at both 20 kV and 8 kV. Phase resolved partial discharge and spectral analyses made it possible to recognize the activity of specific external defects

Keywords

ageing; corona; hydroelectric generators; partial discharges; stators; 20 kV; 8 kV; aging; air-cooled hydrogenerator; bar-to-bar discharge; corona discharge; end arm discharge; external defect; phase resolved partial discharge; semiconductive paint/corona suppressor junction; spectral analysis; stator bar; surface tracking; Aging; Corona; Laboratories; Paints; Partial discharge measurement; Partial discharges; Stator bars; Surface discharges; Time measurement; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1996., IEEE 1996 Annual Report of the Conference on

Conference_Location

Millbrae, CA

Print_ISBN

0-7803-3580-5

Type

conf

DOI

10.1109/CEIDP.1996.564636

Filename

564636