NDLI: Snubber Circuit Design for Transformers in an Urban High Rise Office Building

Content Provider	IEEE Xplore Digital Library
Author	Sutherland, P.E.
Copyright Year	1972
Abstract	Transformer failures have in recent years led to the development of resistor-capacitor snubber circuits for the protection of the transformer and winding insulation from the damaging effects of high-voltage high-frequency transients. Transformer insulation may be damaged if the basic insulation level is exceeded, during turn-to-turn insulation, when there is excessive rate of change of voltage with time (dv/dt), and in switching devices by restrikes when the transient recovery voltage is exceeded. These transients are most often observed when dry-type transformers are closely coupled to vacuum switching devices. Some manufacturers are now including snubbers in their transformer designs. This paper provides a thorough review of the causes of the transients, methods of analysis, and mitigation of the effects of these transients. An example is provided of transformers to be installed in the basement of an urban high rise office building (where the space is limited and the available fault current is high), where the transformer enclosure includes built-in snubber circuits. The strengths and weaknesses of current methods are examined. Recommendations are made for improvements in snubber circuit design and analysis.
Sponsorship	IEEE Industry Applications Society
Starting Page	4347
Ending Page	4356
Page Count	10
File Size	2257454
File Format	PDF
ISSN	00939994
Volume Number	51
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power cables Transient analysis Power transformer insulation Snubbers Cable insulation Cable shielding Transformer failure Transformer snubber circuits Transformer protection Transient overvoltages Transient rate of rise of voltage transient rate of rise of voltage transformer failure transformer protection transformer snubber circuits transient analysis transient overvoltages
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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