An improved method for estimating the insulation resistance of generator stators with cooling water in-situ

Author

Burnley, K.G. ; Exon, J.L.T. ; Jackson, R.J.

Author_Institution

CEGB, London, UK

fYear

1988

fDate

27-30 Jun 1988

Firstpage

301

Lastpage

304

Abstract

The stator winding of a large turbo-generator is constructed from series connected, water cooled, conductor bars. The winding operates at voltages up to 26 kV and is normally insulated with epoxy mica insulation with a peak electric stress of some 34 kV/mm. This paper describes recent work to develop a method of estimating the DC resistance and polarisation index of water cooled stator windings after unit overhaul without the need to dry out the cooling water circuit. The objective being to allow generators to be returned to service in a safe condition with minimum delay

Keywords

composite insulating materials; electric resistance measurement; insulation testing; machine insulation; machine testing; maintenance engineering; organic insulating materials; stators; turbogenerators; 26 kV; cooling water in-situ; epoxy mica insulation; generator stators; improved method; insulation resistance measurement; large turbo-generator; maintenance; minimum delay; polarisation index; stator winding; unit overhaul; water cooled stator windings;

fLanguage

English

Publisher

iet

Conference_Titel

Dielectric Materials, Measurements and Applications, 1988., Fifth International Conference on

Conference_Location

Canterbury

Print_ISBN

0-85296-359-9

Type

conf

Filename

9484