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Experimental study of the current commutation in hybrid DC-breakers
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0003-3515-3536
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
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2015 (English)In: 2015 3rd International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2015, Institute of Electrical and Electronics Engineers (IEEE), 2015, 506-511 p.Conference paper (Refereed)Text
Abstract [en]

To interrupt a current in a DC system where the feeding voltage is higher than a few kilovolt is a challenge. One popular solution today is the hybrid DC-breaker where a semiconductor is bypassed by a mechanical switch in normal operation to decrease the on-state losses. This paper presents an experimental study of the commutation from the mechanical switch to a parallel diode and IGBT. Three sets of tests were performed with six different current levels between 50 and 450 A. The test circuit consists of a capacitor bank as an energy source, a current limiting inductor, and the breaker. As the pre-charged capacitor bank is discharged through the current limiting inductor, the current will rise linearly, similar to the fault current in a stiff DC system. It was seen that with a very low stray inductance in the commutation loop, the commutation occurs in some ten microseconds just after the contact separation. Due to the small contact separation, the contacts might regain metallic contact again, causing the commutation to stop until the contacts separate again and the arc reignites. Longer arcing times were studied by introducing a larger inductance in the commutation loop. For currents of some hundred amperes, the arc voltage is fairly independent of the current level, but increases with increasing contact separation resulting in an increasing current derivative and a faster commutation. Finally the commutation and interruption of a current in a hybrid DC-breaker with an IGBT was demonstrated.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2015. 506-511 p.
Keyword [en]
current commutation, DC-breaker, experimental set-up, fault current limiter, hybrid breaker, Capacitors, Electric commutation, Electric fault currents, Electric inductors, Inductance, Insulated gate bipolar transistors (IGBT), Limiters, Separation, Switching networks, Contact separation, Current derivatives, Dc breakers, Experimental set up, Normal operations, Stray inductances, Fault current limiters
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186783DOI: 10.1109/ICEPE-ST.2015.7368342ISI: 000380583500113ScopusID: 2-s2.0-84962836329ISBN: 978-1-4673-7414-9OAI: oai:DiVA.org:kth-186783DiVA: diva2:931768
Conference
3rd International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2015, Haeundae Grand HotelHaeundae-Beach Road 217, Haeundae-guBusan, South Korea, 25 October 2015 through 28 October 2015
Note

QC 20160530

Available from: 2016-05-30 Created: 2016-05-13 Last updated: 2016-09-22Bibliographically approved

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Magnusson, JesperEngdahl, Göran
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