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(11) | EP 0 572 346 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | High-voltage circuit breaker |
| (57) The present invention relates to a gas high-voltage circuit-breaker, with interrupters
similar to the kind having a compression piston, acting however under a mixed arc
interruption principle, either by simple compression or by self blast by thermal expansion,
and in limiting cases within the action ranges of both principles, by combining the
two. In the range of low-average short-circuit currents the circuit-breaker subject
of the invention acts under the principle of simple compression piston. In the range
of average-high short-circuit currents it acts under the principle of self blast by
thermal expansion, self-locking during the disconnection operation by means of a suitable
mechanism the mobile contacts of its interrupters to form a fixed volume, transitory
therein until interruption of the arc, suited for the operation of this principle This mechanism allows a sharp low energy level of the mechanism used for driving the circuit-breaker, a high interruption power and high short-circuit currents. |