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Open Access research with a European policy impact...

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EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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

Shan, Yunhai and Lim, Tee C. and Finney, Stephen J. and Guang, Weixiao and Williams, Barry W. and Holliday, Derrick and Ding, Xiao (2017) Cascaded commutation circuit for a hybrid DC breaker with dynamic control on fault current and DC breaker voltage. IET Power Electronics. ISSN 1755-4535

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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.