NDLI: Separation of the Energy Absorption and Overvoltage Protection in Solid-State Breakers by the Use of Parallel Varistors

Content Provider	IEEE Xplore Digital Library
Author	Magnusson, J. Saers, R. Liljestrand, L. Engdahl, G.
Copyright Year	1986
Abstract	Hybrid and solid-state breakers offer new possibilities in the power grid by enabling faster switching, and by simplifying dc breaking. However, they consists of expensive power electronic components that are sensitive to overvoltage transients and require energy absorbing elements mounted in parallel. At turn-off, the rapidly decreasing current in the power electronic switch and the presence of an inherent stray inductance leads to hazardous overvoltage transients across the breaker. This paper investigates the possibility to split the overvoltage protection and energy absorption into two separate components. By optimizing the voltage ratio between two varistors, one can dimension a small electronics varistor for overvoltage protection and a large power electronics varistor for energy absorption. With this setup the power electronics varistor is allowed to be in a circuit with a large stray inductance and can thus be placed further away without causing an uncontrolled overvoltage. It is shown both in circuit simulations as well as in a small-scale experiment that if the voltage ratio between the two varistors is large enough, the inner varistor only has to absorb 1-2% of the system energy.
Sponsorship	IEEE Power Electronics Society
Starting Page	2715
Ending Page	2722
Page Count	8
File Size	707748
File Format	PDF
ISSN	08858993
Volume Number	29
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Insulated gate bipolar transistors Switches Varistors Inductance Absorption Oscillators Snubbers solid-state circuit breaker DC breaker metal oxide varistor (MOV) overvoltage protection snubber circuit
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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