Title :
The performance of aged stress grading materials for use in electrical machines
Author :
Gully, A.M. ; Wheeler, J.C.G.
Author_Institution :
Alstom Res. & Technol. Centre, UK
Abstract :
Stress grading materials for rotating machines take the form of glass tape or epoxy paint which has been loaded with a semi-conducting filler, such as silicon carbide. The results from testing a large range of these stress grading materials showed that the surface resistivity could be characterised as a function of surface electrical stress by two constants which represented the resistance at zero stress and the degree of non-linearity. The present work relates the measurements made on samples in the laboratory to the performance found on production bars manufactured for service
Keywords :
ageing; dielectric materials; machine testing; stators; surface conductivity; ageing test; electrical properties; epoxy paint; glass tape; nonlinearity; rotating machine; semiconducting filler; silicon carbide; stator bar; stress grading material; surface resistivity;
Conference_Titel :
Dielectric Materials, Measurements and Applications, 2000. Eighth International Conference on (IEE Conf. Publ. No. 473)
Conference_Location :
Edinburgh
Print_ISBN :
0-85296-730-6
DOI :
10.1049/cp:20000539
