DE1135545B - Electric circuit breaker with magnetic blowing - Google Patents

Description

The invention relates to circuit breakers with magnetic blowing, in which the at the contact point resulting arc is blown into spark chambers, which are divided by sheet metal lamellas. the Subdivision has the Zv / corner to tear the arc into individual pieces, which by the magnetic Blowing upwards and then going out.

In the known designs, these sheet-metal lamellas are either made of iron or of non-magnetic material Material made. For example, brass, cadmium or copper were used for this. Both versions have advantages. One uses lamellas made of iron, which is magnetic is, this supports the magnetic blowing when the arc is drawn into the chamber and the arc accelerated away from the contact. The base of the slides on iron But very slightly forward arc.

This creates the risk that the arc will be driven out of the spark chamber too quickly will before it rips off. The arc can occur outside the lamellas or even outside the spark chamber then knock them together again, which practically prevents the deletion. Because this danger occurs especially with high currents, the breaking capacity of the switches is limited.

It has been proven that lamellas made of non-magnetic material have the property that To make reignition more difficult after the breakdown of the arc, and the more difficult the deeper the Boiling point of the metal used. In addition, the base point slides harder, so that the arc especially with smaller currents it is more difficult to climb into the spark chamber. The knocking out of the The arc is probably prevented by this, but it is also more difficult for the arc to enter the chamber.

It has also been proposed to provide iron lamellas with a non-magnetic coating. Here the magnetic blowing on entry into the chamber can probably be improved, but at the moment, where the arc has gained a foothold on the lamellas, it only rises slowly. In addition, the thin metallic layer can easily damage the lamellas come through the arc. Then the arc would burn partly on iron, and the Restart ability would increase rapidly with the operating time. Furthermore, the coating is a complication in the manufacture of the slats.

In order to avoid the disadvantages, it is now proposed according to the invention that each individual slat be in an electrical circuit breaker
with magnetic blowing

Applicant:

Public company Brown, Boveri & Qe.,
Baden (Switzerland)

Representative: Dr.-Ing. E. Sommerfeld, patent attorney,
Munich 23, Dunantstr. 6th

Claimed priority:
Switzerland of November 2, 1960 (No. 12 278)

Dr. phil. Werner Rieder, Baden (Switzerland),
has been named as the inventor

their part closer to the contact made of magnetic material and further in the spark chamber the part located in a non-magnetic material.

Embodiments of such sheets are shown in FIGS. In Fig. 1 is such a sheet shown, in which the lower part 1 is made of iron, the upper part 2 is made of brass. These parts are included in the Spark chamber, which has grooves, inserted (not shown). The lower part 1 has the usual one Dovetail shape near the contact. In these the arc is established in a known manner drawn into it. Up to the joint 3 the arc rises slightly in height, then, if with certainty the If the arc is divided, it burns on brass, which in turn increases the reignibility after the Extinguishing is decreased and the arc rises more slowly.

Fig. 2 shows another embodiment in which both parts are dovetailed. This has the further advantage that the iron path is the same in the middle of the slats and at the edge is. As a result, it is also dovetailed in the transition from iron to non-magnetic metal present, and there will be the retracting force on the arc during the transition on the Brass part reduced. In addition, one can still at the tip of the dovetail-shaped entrance

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cut to provide a tongue 4 to which the arc passes at this point. There are the neighbors Iron parts are so far removed from the transition point that they are practically no retreating Be able to exert more effect.

The advantage of the proposed arrangement is that the blowing of the arc is increased at the lower part so that the lamellas are not damaged and that at the upper end a lower reignition capacity and a slower one Increase is achieved. So at the same time you can reduce the risk of re-ignition and kick out prevent the arc from escaping the chambers and keep the blowing where it is needed, to enhance. In addition, this design is simple and inexpensive to manufacture.

Claims (4)

PATENT CLAIMS:
1. Electric circuit breaker with magnetic blowing with slats for dividing of the arc in spark chambers, different material being used for the lamellae, characterized in that each individual lamella is made of magnetic material in its part closer to the contact and of non-magnetic material in the part that protrudes further into the spark chamber. 2. Switch with magnetic blowing according to claim 1, characterized in that non-magnetic material is used with a high boiling point will. 3. Switch with magnetic blowing according to claim 1, characterized in that the joint is dovetail-shaped between the non-magnetic and the magnetic material. 4. Switch with magnetic blowing according to claim 3, characterized in that a Narrow tongue made of magnetic material in the non-magnetic material at the joint protrudes. 1 sheet of drawings © 209 638/284 8.