Arc chute having three barriers for the passage of arc gasses

Details Arc chute having three barriers for the passage of arc gasses Arc chute having three barriers for the passage of arc gasses

1996-09-23

1998-05-26

Nappi, Robert

High-voltage switches with arc preventing or extinguishing devic

Arc preventing or extinguishing devices

Magnetic blowout

200144R, 200144C, 200144, H01H 3318, H01H 3308

Patent

active

057569517

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to an arc chute for a circuit-breaker, comprising a chamber housing, arc runners arranged in the chamber housing, and comprising arc splitters supported with clearance between the arc splitters, as well as comprising a cooling arrangement for emergent arc gases, which is disposed above the arc splitters and includes three barriers, the first barrier being disposed directly above the arc splitters, and the second barrier being disposed with clearance from the first barrier, and the first and the second barriers having flow-through openings directed parallel to the end faces of the arc splitters, furthermore comprising a cooling chamber, which is adjacent to the second barrier and is sealed off to the outside by the third barrier that is provided with outlet orifices.
An arc chute of the afore-mentioned type is disclosed by U.S. Pat. No. 3,005,892. The barriers are formed by slitted or slotted plate-shaped insertion pieces in the chamber housing. During operation of the circuit-breaker, these component parts are subjected to very high loads. Therefore, in attempting to achieve a satisfactory lifetime of the component parts, one is only able to attain a limited cooling action. This has an effect on the safety distance to grounded components, which has to be observed when installing the circuit-breaker in a switchgear assembly in order to avoid an electric sparkover caused by the emergence of hot ionized gases out of the arc chute.


SUMMARY OF THE INVENTION

The object of the invention is to so improve the cooling effect of the barrier arrangement that, given the smallest possible dimensions and a long lifetime, only a minimal safety distance to the grounded components will be needed on the outlet side of the arc chute.
The means for attaining the object of the invention are embodied by the following features: arranged in double the pitch of the arc splitters and each web of the first barrier serves as a support for one arc splitter; are disposed opposite the webs of the first barrier, staggered from the webs of the first barrier by the pitch of the arc splitters; and of the arc splitters.
It turns out that a substantially stronger arrangement is able to be realized with the web configuration than with slitted or slotted plate-shaped components, so that the entire arc chute can be designed for a higher arc gas pressure. Therefore, the invention is especially suited for fabricating compact circuit-breakers having a high switching capacity.
Arranging webs above the arc splitters of an arc chute so that every second arc splitter rests against a web is known, per se, from the German Published Unexamined Application 35 41 514. At the same time, that reference discloses that the webs form an outlet grid for arc gases. Should the arc gases need to be cooled to a greater extent on account of there existing only a very small or insignificant distance to the grounded components, then the normal arc chute is provided with an attachable piece, whose inlet side is situated above the web configuration. In contrast, an arc chute is devised by the invention which does not require any additional attachable piece and, in spite of small dimensions, only requires a minimal distance to the grounded components.
In the arc chute disclosed by U.S. Pat. No. 3,005,892 mentioned at the outset, the cooling chamber situated between the second and the third barrier is designed as a mixing chamber, into which the arc gases can enter directly, not only right through the first and the second barrier, but also passing to the side of said barriers. In contrast, according to another embodiment of the present invention, an arc runner and the adjacent arc splitter are covered in each case by an end web so as to allow the arc gases to enter into the cooling chamber situated between the second and the third barrier only along the webs of the second barrier.
Besides having a greater mechanical strength than the slitted, plate-shaped parts, the webs, which have the dimensions indicated at the outset,

REFERENCES:
patent: 2310728 (1943-02-01), Bartlett
patent: 2445190 (1948-07-01), Spiro et al.
patent: 3005892 (1961-10-01), Yarrick
patent: 3440378 (1969-04-01), Baird
patent: 3621169 (1971-11-01), Heft
patent: 4388506 (1983-06-01), Murai
patent: 4511773 (1985-04-01), Heft et al.
patent: 4609797 (1986-09-01), Morton et al.

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