HVDC hybrid circuit breaker with snubber circuit

摘要

A high voltage direct current (HVDC) hybrid circuit breaker is provided. The circuit breaker includes a solid-state main breaker, a mechanical fast disconnector and a solid-state auxiliary breaker connected in series, the series-connection of the disconnector and the auxiliary breaker being connected in parallel to the main breaker, a snubber circuit including a capacitor, and a switching device being arranged for disconnecting the snubber capacitor in response to the auxiliary breaker being opened. By disconnecting the snubber capacitor, an uncontrolled discharging of the capacitor through the disconnector and the main breaker, and the resulting non-zero current flowing through the disconnector during the breaking action, may be avoided. Further, a method of an HVDC hybrid circuit breaker is provided.

主权项

1. A direct current, DC, circuit breaker comprising:
a main breaker, a disconnector and an auxiliary breaker connected in series,the series-connection of the disconnector and the auxiliary breaker being connected in parallel to the main breaker, and
a snubber circuit comprising a capacitor, the capacitor being connected in parallel to the auxiliary breaker,wherein the circuit breaker further comprises switching means being arranged for disconnecting the snubber capacitor in response to the auxiliary breaker being opened.