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In this paper, two new hCB concepts for DC-grids are presented, which use a pulse current to extinguish the arc in the mechanical switch after opening. Both concepts are capable to adjust the pulse current amplitude/waveform to the fault current amplitude and so generate a slow current slope di/dt directly before the zero current crossing without large passive components for a fast and reliable fault...
Interest in HVDC transmission increases, büt still fault handling is difficult because fault currents rise faster than in HVAC transmission. Therefore concepts for a fast turn off of DC lines, especially in case of a short circuit fault, are needed. Turning the complete DC-transmission system off is too slow and not suitable for large grids. To overcome this, several bidirectional HVDC circuit breaker...
This paper presents a performance evaluation in terms of applicability, response times, energy dissipation, passive components and power semiconductors requirements of the four most promising hybrid DC circuit breaker concepts for HVDC grids. Specific design guidelines for all of the hybrid DC circuit breakers are also shown. The evaluation of the hybrid DC circuit breakers has been performed using...
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