On turbogenerator H.V. stator winding condition assessment by the analysis of PDHD detected on phases and insulated coils after untimely failure

Author

Rabach, G. ; Contin, A. ; Razza, F. ; Visintin, Monica

Author_Institution

Dipt. di Elettrotecnica, Elettronica ed Inf., Trieste Univ., Italy

fYear

1998

fDate

22-25 Jun 1998

Firstpage

185

Lastpage

188

Abstract

The paper deals with the results of investigations performed in order to verify whether diagnostic tests, based on Partial Discharge Height Distribution (PDHD) analysis, are able to identify the causes of deterioration and to guide the repair of the insulation system of HV rotating machine stator windings. The insulation system of a turbogenerator was tested after a breakdown occurred in service. Partial Discharge (PD) measurements were performed both on the windings and on single coils. The analysis of the results of PD measurements evidenced that the breakdown was due to a defective impregnation of the winding

Keywords

insulator testing; machine insulation; machine testing; partial discharge measurement; stators; turbogenerators; HV rotating machine; PDHD measurement; breakdown; coil; failure; insulation diagnosis; partial discharge height distribution; stator winding; turbogenerator; Electric breakdown; Insulation testing; Partial discharge measurement; Partial discharges; Performance analysis; Performance evaluation; Rotating machines; Stator windings; System testing; Turbogenerators;

fLanguage

English

Publisher

ieee

Conference_Titel

Conduction and Breakdown in Solid Dielectrics, 1998. ICSD '98. Proceedings of the 1998 IEEE 6th International Conference on

Conference_Location

Vasteras

Print_ISBN

0-7803-4237-2

Type

conf

DOI

10.1109/ICSD.1998.709256

Filename

709256