| 摘要 |
<p>The circuit breaker includes two contacts (1,2) in a cut-off space filled with dielectric gas under pressure. A thermal extinguishing chamber (4) and a piston compression chamber (5) are linked, with a control valve regulating the movement of dielectric gas according to operating circumstances. The gas pressure within the cut-off space varies with different cut-off currents passing between arcing contacts. The circuit breaker includes two contacts (1,2) in a cut-off space filled with dielectric gas under pressure, and between which an arc forms during opening of the circuit breaker. A thermal extinguishing chamber (4) communicates directly with the cut-off space, and a piston compression chamber (5) communicates with the thermal extinguishing chamber. The piston compression chamber (5) communicates with the cut-off space by an evacuation channel (13) which is separated from the thermal extinguishing chamber and which is closed by a valve (14). The valve is situated between the thermal extinguishing chamber (4) and the piston compression chamber (5) so as to open and allow the evacuation of over-pressure gas from the piston compression chamber through the cut-off space via the channel (13), when the over-pressure of gas in the thermal extinguishing chamber is greater than the over-pressure of gas in the piston compression chamber.</p> |
