NDLI: Harmonic interaction in generator pre-sunchronous operation

Content Provider	IEEE Xplore Digital Library
Author	de Mello, F.P.
Copyright Year	2012
Abstract	The pre-synchronous condition of generators operating at normal speed, with voltage on manual control, while connected to open circuited step up transformers, can last several minutes. This is particularly true if plant problems delay the synchronization process. Under these conditions the generator absorbs all the positive and negative sequence harmonics due to transformer saturation. Instances of unexplained excursions in voltage and erratic excitation system operation have come to the author's attention over several years. Some involving over-voltages and step up transformer insulation failures. This paper suggests that interactions between the harmonic currents in the generator stator propagating, through induction, to the field current and to the diode-bridge excitation system may be the cause. The dynamics of this process are explored through time domain simulations, in attempts to explain the nature of the problem. Recommendations are given on measures to avoid the occurrence of such interactions.
Starting Page	1
Ending Page	7
File Size	1412174
Page Count	7
File Format	PDF
ISBN	9781467328685
e-ISBN	9781467328685
DOI	10.1109/PowerCon.2012.6401461
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-30
Publisher Place	New Zealand
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetomechanical effects Generators Magnetic domains Harmonic analysis Equations Windings Pre-synchronous Operation Failures Harmonics Overvoltage
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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