Series LC DC Circuit Breaker

Dragan Jovcic* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)
40 Downloads (Pure)


The article proposes a mechanical DC CB based on a series LC circuit. It requires two switches (a fast disconnector, and an AC Circuit breaker), an inductor and a capacitor, and therefore the cost is expected to be low. A series LC circuit is analyzed and it is concluded that fault current will always have natural zero-current crossings which enable use of simple AC CBs. The current commutation into a capacitor is investigated since this is important for successful operation. A number of analytical conditions are derived for the voltage stress across disconnector contacts which enable arc-less contact opening. Experimental results on a 900 V laboratory prototype LC DC CB illustrate successful DC fault clearing, with commutation of 130 A and peak DC current of 190 A.
A detailed PSCAD model for 320 kV LC DC CB is developed and DC fault clearing is evaluated in order to understand the possible benefit for HVDC applications. Further comparisons with the commercialized hybrid DC CB and mechanical DC CB on 320 kV system illustrate some benefits in terms of performance and simplicity. The mechanical LC DC CB operates very fast because of early capacitor insertion, and this results in low peak current and energy dissipation.
Original languageEnglish
Pages (from-to)130-137
Number of pages8
JournalHigh Voltage
Issue number2
Early online date3 Apr 2019
Publication statusPublished - Jun 2019

Bibliographical note

This work was supported by the Europend Udiod’s Horizon 2020 research and innovation program under grant No. 691714.
The author is thankful to Mr R. Osborne from University of Aberdeen for help with the experimental studies


  • DC power transmission
  • HVDC power transmission
  • power systems
  • inductor
  • fault currents
  • fast disconnector
  • peak DC current
  • natural zero-current crossings
  • 0 A
  • LC circuits
  • mechanical DC circuit breaker
  • current 130
  • circuit breakers
  • current 190
  • low peak current
  • series LC DC circuit breaker
  • current commutation
  • simple AC CB
  • commercialised hybrid DC CB
  • power capacitors
  • disconnector contacts
  • fault current
  • 0 V
  • voltage 320
  • laboratory prototype LC DC CB
  • 0 kV
  • DC fault clearing
  • mechanical DC CB
  • capacitor
  • voltage 900
  • power inductors
  • energy dissipation
  • high-voltage direct current applications
  • mechanical LC DC CB
  • AC circuit breaker


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