DE1104586B - Electric circuit breaker - Google Patents

Description

Electrical circuit breaker With the expansion switch, the in The switching liquid located in the vicinity of the arc evaporates and at a certain pressure the switching chamber opened, causing a sudden pressure relief enters the switching chamber and the arc is extinguished. Since with large currents the pressure required to open the switching chamber much faster than is reached at low currents, the switching time or the switching capacity is a Expansion switch depends on the strength of the current to be switched off. So should the circuit is interrupted by an expansion switch alone, so the switching chamber must be made very long to make the interruption smaller Ensure currents.

On the other hand, takes place in switches in which the extinguishing medium is in the arc path, sprayed or blown to the deletion barren arc, the quenching of the arc, the smaller the faster the current to be disconnected.

According to the invention, circuit breakers can be considerably improved by the fact that the circuit breaker consists of an expansion switch part and your switch part, in which the arc is extinguished by feeding the extinguishing agent into the arc path, with large currents being switched off by the expan # sion switch part takes place, and the exhaust circuit of low currents, is carried out by the last-mentioned switch part. Since each switch part is used in the gimstigen for him current range for the interruption of the circuit, avoiding the vorhande at said switch versions # NEN disadvantages. H.ierdurch is achieves that the disconnection takes place very quickly, regardless of whether a small or large current is flowing in the circuit to be interrupted, since the operating conditions which are unfavorable for them need not be taken into account when designing the individual switch parts the construction of the switch despite its high Efficiency particularly easy. In order to inject the extinguishing agent into the arc path in the case of the switch part which serves to extinguish small currents, a special energy source or the pressure generated in the expansion switch part during the switch-off process can be used.

In the drawing is an Aus, leadership example of a switch according to of the invention shown.

1 with the stationary contact piece and 2 with the movable contact piece. The expansion switch part bears the number 3 and the switch part assigned to the small currents has the reference number 4. The expansion switch part 3 consists of a switching chamber 10 formed from insulating plates 5 and springs6. The switch part 14 has a piston 7 which is under the action of a spring and which is arranged in the oil container 9. In the oil container 9 bores 8 are provided for the exit of the oil.

When the contact pieces 1 and 2 are separated, an arc is drawn in the chamber 10, through which part of the old liquid evaporates, whereby the pressure in the switching chamber 10 rises rapidly. If the increase in pressure in the switching chamber 10 is so great that it overcomes the force of the springs 6, the steam in the switching chamber can escape and cause the arc to be extinguished. If, on the other hand, the pressure generated in the switching chamber 10 is not so great that the switching chamber opens, the bores present in the switch part 4 in the oil container 9 are released during the further movement of the switching piece 2. In diesern moment of Kolhen 7 through the, in which chamber 10 moves prevailing pressure against the force of the spring upwardly and the oil in the oil reservoir 9 through the bores. 8 is injected into the arc hole, which causes the arc to be extinguished.

The switch shown in the drawing is designed so that first the expansion switch part and then the switch part assigned to the small currents is used to extinguish the arc. The switch can also be designed in such a way that each switch point is assigned to the two switch parts, so that the two switch parts come into effect either at the same time or at a certain time interval one after the other.

Claims (2)

PATENT CLAIMS-1. Electrical circuit breaker, especially liquid switch, characterized in that the switch consists of an expansion switch part for disconnection large currents and a switch part for switching off small currents the extinguishing of the arc by feeding the extinguishing agent into the arc path he follows. 2. Switch according to claim 1, characterized in that both switch parts are assigned a common switching point. 3. Switch according to claim 2, characterized in that the common switching point is arranged so that the expansion switch part comes into effect first during the Aussehaltvorgang. 4. Switch according to claim 1, characterized in that the switch part assigned to the small currents consists of a container which receives the extinguishing agent and a piston which is under the action of a spring and which is provided with bores, the release of which by the movable contact piece first against the end of the switch-off device on-it takes place. 5. Switch according to claim 4, characterized in that the actuation of the piston is carried out by the pressure generated in the expansion switch part during the Aw # switching process. 6. Switch according to claim 4, characterized in that a bus special energy source is provided for actuating the piston. 7. Switch according to claim 1, characterized in that the two switch parts are each assigned a switching point. 8. Switch according to claim 7, characterized in that both switching points are opened simultaneously. Documents considered: German Patent Specifications No. 663463, 756-171.