Title :
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
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;
Conference_Titel :
Dielectric Materials, Measurements and Applications, 1988., Fifth International Conference on
Conference_Location :
Canterbury
Print_ISBN :
0-85296-359-9
