Design, Modeling and Control of Hybrid DC Circuit Breaker Based on Fast Thyristors

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This paper presents a systematic study on designing hybrid direct current (DC) circuit breaker (CB) based on fast thyristors. As an illustration, the DC CB main parameters are calculated for a 120kV, 1.5kA test breaker with interrupting
current of 10kA. The studies indicate that the opening time of 2.3ms can be achieved only if fast thyristors are employed. It is further illustrated that there is a design tradeoff between minimum interrupting current capability and discharge time for the internal capacitors (reclosing speed). The DC CB control
system for opening and closing is presented based on different levels of protection and the self-protection. The DC CB is modelled in PSCAD and simulation results are used to evaluate the breaker performance under different operating conditions. It is concluded that the model represents well the DC CB and can be employed for DC grid protection studies. It is further shown that opening time becomes longer as interrupting current reduces, and it is very long in case of load current interruption.
Original languageEnglish
Pages (from-to)919-927
Number of pages9
JournalIEEE Transactions on Power Delivery
Issue number2
Early online date9 Oct 2017
Publication statusPublished - 2 Apr 2018


  • DC grids
  • protection
  • hybrid DC circuit breaker
  • fast thyristor


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