| 摘要 |
A compressed gas circuit breaker is disclosed having a closed gas circuit, in which an electro-negative gas (preferably sulphur hexafluoride) serves as the quenching medium to quench any electrical arc formed between two electrical contacts upon the operation of the breaker. In the device the gas flows from a high-pressure tank where the gas is stored into a low-pressure space containing a quenching chamber where the electrical contacts are located. The flow occurs upon the opening of a blast valve connecting the high-pressure tank with the low pressure space and the quenching chamber. The high pressure is obtained by means of two pressure producing devices. The first is a compressor which, after the operation of the breaker, returns the gas from the low-pressure space to the high-pressure tank and raises the pressure of the gas to a pressure lower than the liquefaction pressure of the gas at low operating temperatures. The gas is thereupon stored in the high-pressure tank under these conditions until the breaker operates again. The high-pressure tank further contains a second gas compression means by which the gas pressure is further increased to a higher pressure at the time it is supplied to the quenching chamber or low-pressure space when the electrical arc is formed by the operation of the circuit breaker.
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