DocumentCode
848918
Title
Experience with part-winding resonance in EHV auto-transformers: Diagnosis and corrective measures
Author
Margolis, H.B. ; Phelps, J.D.M. ; Carlomagno, A.A. ; McElroy, A.J.
Author_Institution
American Electric Power Service Corporation, New York, New York
Volume
94
Issue
4
fYear
1975
fDate
7/1/1975 12:00:00 AM
Firstpage
1294
Lastpage
1300
Abstract
Four failures of large EHV auto-transformers on the AEP system are described. The failures were initiated by flashovers in the no-load tap changer during system faults. Investigations and tests attribute the flashovers to part-winding resonance. Test data is presented for various terminal conditions and wave shapes corresponding to system transient conditions. The relationship of these tests to ANSI standard dielectric tests is discussed. Corrective measures for existing transformers include arresters tied to an internal crossover connection and capacitor banks connected to the delta tertiary windings.
Keywords
Arresters; Capacitors; Dielectric measurements; Flashover; Lightning; Performance evaluation; Power system transients; Resonance; System testing; Transformers;
fLanguage
English
Journal_Title
Power Apparatus and Systems, IEEE Transactions on
Publisher
ieee
ISSN
0018-9510
Type
jour
DOI
10.1109/T-PAS.1975.31967
Filename
1601569
Link To Document