Advantages of high voltage DC dielectric tests compared with AC tests

Author

Audoli, Alain ; Drommi, Jean-Louis

Author_Institution

Electricite de France, Grenoble, France

fYear

1993

fDate

4-7 Oct 1993

Firstpage

661

Lastpage

665

Abstract

Electricite de France (EDF) generators undergo dielectric tests at acceptance or after repair. One of these tests is an overvoltage test following the IEC 34-1 standard. EDF specifications leave manufacturers free to choose either AC or DC voltage to perform this test. Experience acquired in this field seems to confirm that tests under high voltage DC give more information than AC on the hidden weaknesses of the winding. The use of DC limits the consequences of test on insulation aging or of a possible dielectric breakdown while voltage is applied. The advantages and drawbacks of both DC and AC are discussed. Various cases dealing with operating generators are described

Keywords

electric generators; EDF; Electricite de France; HVDC; IEC 34-1 standard; acceptance; dielectric breakdown; generator insulation tests; hidden weaknesses; high voltage DC dielectric tests; insulation aging; overvoltage test; repair; specifications; winding; AC generators; Aging; DC generators; Dielectrics and electrical insulation; IEC standards; Insulation testing; Manufacturing; Performance evaluation; Power generation; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, 1993. Proceedings., Chicago '93 EEIC/ICWA Exposition

Conference_Location

Chicago, IL

ISSN

1071-6270

Print_ISBN

0-7803-0847-6

Type

conf

DOI

10.1109/EEIC.1993.631306

Filename

631306