Sulfur hexafluoride circuit breaker

Self-blast circuit breakers are that used to come in high- voltage switchgear. You are able to interrupt high short -circuit currents by gas blown the resulting switching arc during the switching process under high pressure and delete as soon as possible. In the high voltage range almost exclusively sulfur hexafluoride ( SF6) is used as extinguishing agents. Unlike ordinary SF6 Kolbenblasschaltern the Self-blast requires much less energy for the extinguishing system.

The development of SF6 Selbstblasschaltern go back to work by Winthrop Leeds and colleagues at Westinghouse Electric in 1957.

Operation

During switching-off, the extinguishing gas is compressed by the piston motion at first and then flows from the high pressure chamber via the burning arc. Self-blast when one uses a sensible housing structure in order to achieve an additional pressure due to the high temperature of the arc. This saves driving power for the compression of the gas.