DC circuit breaker, mechanical circuit breaker for DC circuit breaker, and semiconductor circuit breaker for DC circuit breaker

摘要

The DC breaker of the embodiment has a mechanical breaker, a semiconductor breaker, and a commutation device. The machine shut-off unit has at least one machine shut-off unit and an insulating post that supports the at least one machine shut-off unit. The machine shut-off unit has at least one single shut-off unit. The single blocking part has a mechanical contact part, a sealed container, an operating rod, and an operating mechanism. The mechanical contact portion has a fixed contact and a movable contact. The mechanical contact portion is electrically insulated from the ground. The sealed container encloses the mechanical contact portion and the insulating gas. The sealed container is electrically insulated from the ground. The operation rod is connected to the movable contact. The operation rod extends from the inside of the sealed container to the outside. The operation mechanism is connected to the operation rod. The operating mechanism moves the movable contact toward and away from the fixed contact. The operating mechanism is provided at the same potential as the movable contact.