NDLI: Transformer failure due to circuit breaker induced switching transients

Content Provider	IEEE Xplore Digital Library
Author	Shipp, D.D. Dionise, T.J. Lorch, V. MacFarlane, B.G.
Copyright Year	2011
Description	Author affiliation: Eaton Electrical Group, 130 Commonwealth Dr., Warrendale, PA 15086, USA (Shipp, D.D.; Dionise, T.J.; Lorch, V.) \|\| CSD Engineers, 555 North Bell Ave, Carnegie, PA 15106, USA (MacFarlane, B.G.)
Abstract	Switching transients associated with circuit breakers have been observed for many years. Recently this phenomenon has been attributed to a significant number of transformer failures involving primary circuit breaker switching. These transformer failures had common contributing factors such as 1) primary vacuum or SF-6 breaker, 2) short cable or bus connection to transformer, and 3) application involving dry-type or cast coil transformers and some liquid filled. This paper will review these recent transformer failures due to primary circuit breaker switching transients to show the severity of damage caused by the voltage surge and discuss the common contributing factors. Next, switching transient simulations in the electromagnetic transients program (EMTP) will give case studies which illustrate how breaker characteristics of current chopping and re-strike combine with critical circuit characteristics to cause transformer failure. Design and installation considerations will be addressed, especially the challenges of retrofitting a snubber to an existing facility with limited space. Finally, several techniques and equipment that have proven to successfully mitigate the breaker switching transients will be presented including surge arresters, surge capacitors, snubbers and these in combination.
Starting Page	1
Ending Page	10
File Size	1013151
Page Count	10
File Format	PDF
ISBN	9781424499991
ISSN	21584893
e-ISBN	9781612841274
DOI	10.1109/ICPS.2011.5890893
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-05-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transient analysis Oil insulation Power transformer insulation Circuit breakers Switches Windings RC snubbers Switching Transients vacuum breakers SF-6 breakers EMTP simulations surge arresters
Content Type	Text
Resource Type	Article

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