DE1023111B - Fire chamber for low-oil electrical circuit breakers - Google Patents

Description

GERMAN

The invention relates to an arcing chamber for low-oil electrical circuit breakers, mainly for such a smaller performance, which is distinguished from known ones in that they are despite small dimensions has a particularly high extinguishing capacity and also a particularly simple structure. she is mainly characterized in that the ring channel leading to the arc goes through that of the arc generated pressure is initially closed and only when the current strength decreases by the arc pressure counteracting force is opened. This will unnecessarily increase the arc voltage avoided, which otherwise always occurs when the arc is still high when the current is high Exposed to the action of a powerful jet of oil. The increase in arc voltage brings about a unnecessary burning of the oil with it.

The invention is explained with reference to the drawing, which schematically shows an extinguishing chamber according to the invention shows. In the drawing, 1 denotes an insulating cylinder, which is made up of a cover 2 at the bottom Metal is complete. The fixed contact 3 of the switch is attached to this. The moving contact, a pin contact is denoted by 4. In the cylinder 1 a second insulating cylinder 5 is attached, that by an annular cover 6 'with a metal cylinder attached to the upper end of the cylinder 1 6 is connected. The cylinder 5 has a bottom 7 with an opening 8 for the passage of the movable contact 4. A piston 9, consisting of an insulating cylinder, is seated under the base 7 10 and a cover 11, which also has an opening 12 for the passage of the movable contact. The piston 9 has ribs or other inwardly projecting lugs 13 that are attached to the fixed contact 3 or slide on a sleeve surrounding this, whereby the piston 9 is guided in the radial direction. the The extinguishing chamber is filled with oil up to a certain height, but above the oil level between the cylinders 5 and 6 is a storage space 14 which is filled with air or another gas.

The arrangement works in the following way: When the contacts 3 and 4 separate from each other, it arises between them an arc in the space delimited by the piston 9. The pressure exerted by this arc is generated, lifts the piston 9 so that its cover 11 is pressed against the base 7. Die piston 9 ist in der Piston 9 auf which closes the gap between these two parts. At the same time, the lower edge of the piston 9 a passage for the oil in the space between the cylinders 1 and 5 opened, whereby the oil level rises in this space, so that the gas in the storage space 14 is compressed will. With the further upward movement of the

Fire chamber for low-oil electrical
Circuit breaker

Applicant:

Allmänna Svenska Elektriska
Aktiebolaget, Vasteras (Sweden)

Representative: Dipl.-Ing. H. Missling, patent attorney,
Giessen, Bismarckstrasse. 43

Claimed priority:
Sweden from June 4, 1954

Haakon Forwald, Ludvika (Sweden),
has been named as the inventor

cycle 4, the pressure inside the piston 9 drops, once because the current intensity of the arc decreases, and on the other hand, because the switching pin the through openings j 12 and 8 releases. The gas compressed in the storage space 14 then pushes the piston 9 further at the bottom against the base plate 2 and at the same time drives oil through the annular gap between the bases 7 and 11 into the arc and causes the arc to be extinguished. The downward movement of the piston 9 in this point in time can be supported by a spring which is tensioned when the piston 9 is lifted will.

The invention can be implemented in various forms. It is essential that the quenching chamber has an annular gap through which oil can flow after the arc, and that the width of this annular gap depends on the pressure, so that the gap is closed by the arc when the current is high and is only opened when the pressure of the arc drops.

Claims (4)

PATENT CLAIMS: 1. Arcing chamber for low-oil electrical circuit breakers, in which an oil flow from the arc generated and this is guided through channels against the arc, characterized in that the ring channel leading to the arc is initially closed by the pressure generated by the arc and only when the current decreases 709 850/325 is opened by a force counteracting the arc pressure. 2. extinguishing chamber according to claim 1, characterized in that that the extinguishing chamber is filled with air or gas in a manner known per se Storage space contains the air or gas in this space due to the initial arc pressure compressed and that this pressure to the opening of the channels leading to the arc is used when the arc pressure is decreasing. 3. arcing chamber according to claims 1 and 2, characterized in that the arc in a piston-like housing is drawn, which once the channels leading to the arc and on the other hand, channels are limited, which the arcing chamber with the interior of the piston-like housing connects. 4. extinguishing chamber according to claim 3, characterized in that it consists of a cylinder (1) with The bottom (2), which carries the fixed contact (3), consists of a contact that encloses this, on the bottom (2) standing piston-like housing (9), the bottom (11) of which has a through opening for the moving contact, and a fixed cylinder (5) arranged above with a base (7) which, together with the base (11) of the housing (9), forms an arc surrounding annular gap forms during the extinguishing process and a passage opening (8) for has the movable contact (4). Considered publications:
German patent specifications No. 671 265, 662 807. 1 sheet of drawings © 709 850/325 1.58