Title :
Advantages of high voltage DC dielectric tests compared with AC tests
Author :
Audoli, Alain ; Drommi, Jean-Louis
Author_Institution :
Electricite de France, Grenoble, France
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;
Conference_Titel :
Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, 1993. Proceedings., Chicago '93 EEIC/ICWA Exposition
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-0847-6
DOI :
10.1109/EEIC.1993.631306
