Multibreak LC DC Circuit Breaker

Dragan Jovcic* (Corresponding Author)

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution


LC DC Circuit breaker has previously demonstrated great potential for applications with DC grids at high or medium voltage, and this paper presents further technology improvements based on an experimental study. The increase in the arc voltage is analysed as the number of break points increases, since arc voltage critically determines magnitude of DC current that can be commutated. The paper describes the design of a 4-break contact assembly which provides total air gap of around 6 mm. It is concluded that it is feasible to build a 4-break
disconnector with a 5 m/s gap velocity and with around 30-40 µs tolerance in the opening time of the four breaks. The experiments show that each break point increases the gap voltage and the commutating current almost proportionally to the number of break points. The measurements confirm that 4-break LC DC Circuit Breaker using 800 µF capacitor can commutate 930 A DC
current with around 4.2 kV recovery voltage. It is measured that the commutation occurs 290 µs after the trip signal, which also denotes the time when DC CB begins inserting increasing counter voltage, and which is faster than most commercial DC breakers.
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publication2022 IEEE PES General Meeting
PublisherIEEE Explore
Number of pages5
ISBN (Electronic)978-1-6654-0823-3
ISBN (Print)978-1-6654-0824-0
Publication statusPublished - 2022
Event2022 IEEE Power & Energy Society General Meeting (GM): IEEE PES - Sheraton Denver Downtown Hotel, Denver, United States
Duration: 17 Jul 202221 Jul 2022

Publication series

NameIEEE Power & Energy Society General Meeting (PESGM)
ISSN (Print)1944-9925
ISSN (Electronic)1944-9933


Conference2022 IEEE Power & Energy Society General Meeting (GM)
Abbreviated titleIEEE PES
Country/TerritoryUnited States
Internet address

Bibliographical note

The author is thankful to Mr Richard Osborne, technician from University of Aberdeen for the experimental support.

This work was supported by the European Union’s Horizon 2020 research and innovation program under grant No. 691714, and SFC COVID 19 grant.


  • DC switchgear
  • HVDC protection
  • DC Circuit Breakers


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