Development and Experimental Evaluation of 2 -10 kV LC DC Circuit Breaker Module

Dragan Jovcic* (Corresponding Author), Stefan Kovacevic

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The article analyses design options for a practical 2-10 kV, 1-2 kA LC DC Circuit Breaker module. The impact of multiple series break points with the ultra-fast disconnector is explored in depth using analytical model and 5 kV, 4-break
hardware prototype. The experimental testing demonstrates that the arc voltage increases proportionally with each breaking point, and this increases current that can be internally commutated. Further analysis of the impact of delays between break points is presented. Modeling and testing with 4 different capacitors of 1-10 kV concludes that larger capacitances increase commutating current, but relationship is complex and non-linear. Parallel connection of breaking points is also analysed. Successful breaking of DC fault current is demonstrated on hardware for multiple cases including 930 A with 800 µF, 6.5 kV, capacitor using a 4- break disconnector. The tested DC CB is of mechanical type, which inserts a capacitor in series in a very short time of around 290 µs, and full contact separation is achieved 1.5 ms after the trip signal. It is recommended that the module design should primarily consider maximizing the number of break points in series.
Original languageEnglish
Pages (from-to)4945-4955
Number of pages10
JournalIEEE Transactions on Power Delivery
Issue number6
Early online date12 Apr 2022
Publication statusPublished - Dec 2022

Bibliographical note

The authors are thankful to Mr Richard Osborne, technician from University of Aberdeen for the experimental studies. We are also thankful to Igor Golosnoy from University of Southampton for advice on contact assembly topology.

This work was supported by the SFC COVID 19 Grant. Paper no. TPWRD-01387-2021


  • DC switchgear
  • HVDC protection
  • DC Circuit Breakers


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