SELF-BLAST TYPE GAS CIRCUIT BREAKER WITH PRESSURE CONTROLLABLE THERMAL CHAMBER

摘要

The present invention relates to a complex air-blast gas circuit breaker with a pressure controllable thermal chamber, more specifically, to a complex air-blast gas circuit breaker with a pressure controllable thermal chamber capable of effectively eliminating arcs between a fixed arc contact point and a movable arc contact point by maintaining the pressure of insulating gas at an optimal level with a pressure-reducing chamber connected to one side of a thermal expansion chamber via a check valve to break fault current with excellent circuit breaking performance in a swift and reliable manner. The complex air-blast gas circuit breaker with a pressure controllable thermal chamber according to the present invention includes a housing filled with insulating gas; a cylinder which is installed in the housing, has an exhausting hole inside, and has a popper chamber filled with frozen insulating gas next to the thermal expansion chamber with a check valve being in between the two chambers outside the exhausting hole; a movable arc contact point installed in one end of the exhausting hole; and a fixed arc contact point fixed in the housing and coming in contact with the movable arc contact point while an additional pressure-reducing chamber for controlling the pressure of the thermal expansion chamber is installed on one side of the thermal expansion chamber to reduce the pressure of the thermal expansion chamber below the reference pressure level.