Cascaded commutation circuit for a hybrid DC breaker with dynamic control on fault current and DC breaker voltage

Yunhai Shan, Tee C. Lim, Stephen J. Finney, Weixiao Guang, Barry W. Williams, Derrick Holliday, Xiao Ding

Research output: Contribution to journalArticle

4 Citations (Scopus)
110 Downloads (Pure)


This paper proposed a cascaded commutation circuit based on current commutation approach for low-to-medium voltage DC fault current interruption, without snubber circuits, which slows the fault current di/dt prior to current-zero and the rate of rise of the transient recovery voltage dv/dt across the mechanical breaker contacts after current zero. The proposed dynamic control of the fault current di/dt and circuit breaker voltage dVVCB/dt increase the fault current interruption capabilityat the first and second current-zeros. Detailed mathematical equations are presented to evaluate the operational waveform profile and the validity of the cascaded commutation principle is confirmed by simulation and experimental results at 600Vdc, 110A and 330A.
Original languageEnglish
JournalIET Power Electronics
Early online date5 Jan 2017
Publication statusE-pub ahead of print - 5 Jan 2017



  • hybrid DC breaker
  • current commutation
  • current-zero
  • fault interruption
  • dynamic cfontrol
  • fault current
  • waveform profile
  • cascaded commutation principle

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