| 摘要 |
<p>The invention relates to a method for extinguishing an arc which is formed during the breaking of the electrical contact in a power circuit-breaker of the puffer type, by means of a gas stream, such as an SF6 gas stream. The gas stream comes from a pressure chamber which is placed in connection with the arc. The electrical contact is broken by separating two contacts from one another and then moving them further apart. The connection between the arc and the pressure chamber is established after a predetermined delay time after the contacts have been separated or after the contacts have been separated from one another by a predetermined distance. The invention furthermore relates to a power circuit-breaker of the puffer type, which is suitable in particular for carrying out the method according to the invention. To this end, the circuit breaker comprises closure means for closing and opening the pressure-chamber outlet, which closure means are designed in such a manner that the pressure-chamber outlet is closed at the moment at which the moveable contacts are separated from one another and is opened after a predetermined delay time or after the contacts have been separated from one another by a predetermined distance. <IMAGE></p> |
