Abstract:

Since the 1990s, the reliability of circuit breaker （CB） device increase greatly along with the continuous progress of CB technology, but the technical level of disconnector （DS） has stagnated. So, the new disconnecting circuit breaker （DCB） devices have been applied to the power grid. This paper studied the 110 kV DCB which was applied in Wuhan 110 kV Future City Substation, compared DCB with tradition CB and DS, and introduced the design idea, main characteristics and advantages of DCB. The technical features, application situations, and specific type test requirements of DCB were analyzed, through the research findings of DCB’s foreign application, type test and on-line monitoring status. The research results can provide reference and experience for the application and operation maintenance management of DCB in the new smart substations.

Key words: disconnecting circuit breaker, new generation smart substation, type test, on-line monitoring