DC SwitchgearHV DC Switchgear

Current waveforms of the high voltage hybrid DC circuit breaker

The operation of the hybrid circuit breaker is divided into eight intervals corresponding to four operation modes. It contains a normal mode (t0~t2) to transfer the power between the sides without any interruption, a breaking mode (t2~t5) to break the fault current, a discharging mode (t5~t6) to reduce the capacitor voltage to the rated voltage, and a reverse mode (t6~t7) to change the capacitor polarity. IS1: Residual DC current disconnector. IS2 ,S3:Fast mechanical switch current. IC: Auxiliary branches capacitor current. I MOV: Metal oxide varistors current. IT3: Reverse the polarity of capacitor thyristor current.

A Novel Topology of Hybrid HVDC Circuit Breaker for VSC-HVDC Application ArticleVan-Vinh NguyenHo-Ik SonThai-Thanh NguyenHak-Man Kim and Chan-Ki Kim

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