DocumentCode :
984892
Title :
Detection and location of internal defects in the insulation of power transformers
Author :
Fuhr, J. ; Haessig, M. ; Boss, P. ; Tschudi, D. ; King, R.A.
Author_Institution :
ABB Corp. Res., Baden-Daettwil, Switzerland
Volume :
28
Issue :
6
fYear :
1993
fDate :
12/1/1993 12:00:00 AM
Firstpage :
1057
Lastpage :
1067
Abstract :
With the development of fast, and low-cost analog-digital converters (ADCs) and new mathematical procedures for waveform description, e.g., time encoded signal processing and recognition (TESPAR), novel approaches to detect and locate internal defects in the insulation of power transformers become feasible if the following requirements are fulfilled: the equivalent circuit of the insulating system, suitable for the fast partial discharge (PD) signals with risetimes of ~10 ns, is known; the response of the insulating system to PD signals injected at least at three different sites of each winding (top, center, bottom) is calculated, or measured at the signal tap-off points (i.e., bushings); and the pattern matrix of all calculated or measured signals exists: e.g., encoded and signal processes with TESPAR as a reference. The above mentioned requirements are examined for quasi-simultaneous detection and location of internal defects in power transformers. The method is applied to PD measurements on power transformers
Keywords :
equivalent circuits; insulation testing; partial discharges; power transformers; transformer insulation; transformer testing; PD measurements; PD signals; TESPAR; defect location; defects detection; insulation; internal defects; power transformers; signal recognition; time encoded signal processing; windings; Analog-digital conversion; Equivalent circuits; Matrix converters; Partial discharges; Pattern recognition; Power measurement; Power transformer insulation; Power transformers; Signal processing; Time measurement;
fLanguage :
English
Journal_Title :
Electrical Insulation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9367
Type :
jour
DOI :
10.1109/14.249379
Filename :
249379
Link To Document :
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