DE1143891B - Arrangement of extinguishing chambers for liquid switches with cross flushing of the drawn arc - Google Patents

Description

For extinguishing chamber switches with cross purging of the The arc drawn in the chamber drives the arcing that arises in the quenching chamber during the switch-off process Pressure the liquid-gas mixture from a pressure space through arranged in the chamber wall Cross channels in a room with lower pressure. Here, the channels can be stacked on top of one another Be arranged insulating plates or are formed by these. Most known arrangements of this type show arcing chambers with horizontal transverse channels, one of which is the fixed contact assigned transverse channel is released immediately after the contact separation and the arc gases lets escape. Another known arrangement has upwardly sloping channels that direct the hot arc gases directly upwards when the contacts are separated. It exists thus the risk of re-ignitions on live parts. This embodiment is particularly disadvantageous. In all arcing chambers of this type, the height of the pressure maximum is during the extinguishing process of the arc depends to a large extent on the duration of the arc. It must therefore be sought to keep the arc duration as short as possible.

In order to achieve this, switches of the type identified above are used in accordance with the invention the transverse channel immediately adjacent to the stationary contact point in such a manner obliquely in the direction of movement of the switching pin arranged so that the inner opening of the transverse channel is as close as possible to this contact point is located, while the outer opening facing away from the external, live parts is. The main advantage of the subject invention is that the inner opening of the Transverse channel, which is adjacent to the stationary contact piece, is arranged so that shortly after Separation of the interacting contact elements due to the resulting arc in the still closed Such a pressure build-up goes on that immediately after the release of the inner chamber When the transverse channel is opened by the switch pin, a powerful transverse flushing of the arc begins. Of the The transverse channel is inclined to the axis of the switch pin so that the pressurized liquid-gas mixture can flow away immediately in such a way that it is released from metal parts of the switching device that are under voltage is kept away. A re-ignition of the arc is effectively prevented because the hot ones Switching gases are sufficiently cooled on their way into the pressure-free space. By so diminished Switching work increases the service life of the contact pieces arrangement on arcing chambers

for liquid switch with cross purging

of the drawn arc

Applicant:

Continental electrical industry

Aktiengesellschaft, Voigt & Haeffner,

Frankfurt / M., Hanauer Landstr. 142-172

Dipl.-Ing. F. Fohrmann, Frankfurt / M.,
has been named as the inventor

as well as that of the insulating material chamber parts are significantly extended. The risk of reducing the insulation strength the surface due to arcing is reduced and the compressive stress the chamber lowered.

The material removal from the duct opening caused by the arc remains low because the inclined position of the channel corresponds to the direction of the ejected arc gases and through the Thickness of the sewer wall, which is steadily increasing, the unavoidable burn-off phenomena are not significant Cause changes to the duct opening.

It has been found to be beneficial to give the canal a round cross-section because of experience has shown that a rectangular canal through the flow stress and through the burn gradually turns into a circular shape. If it is a switch of higher voltage series, then advantageously several of the insulating plates initially arranged at the contact point with an inclined afterwards provided downwardly directed transverse channel. This can expediently in different directions Pointing outlet openings of the transverse channels of the plates lying on top of one another through to the wall of the switch reaching longitudinal webs must be shielded from one another.

The drawings serve to explain the invention. In Figure 1, an extinguishing chamber is in section

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shown. Figures 2 to 4 show an insulating plate with an inclined transverse channel in different views, partially cut, namely for an arcing chamber, which is intended for switches of a higher voltage series.

1 is the switch housing; 2 the quenching chamber, which is formed by the stacked insulating plates 3, 4, 5, 6, 7, 8 and by part of the switch housing 1. The openings in the insulating plates 3, 5 and 7 are covered in the switched-on position by the switching pin 9, which is in engagement with the contact tulip 10. The insulating material plate 3 has an inclined hole 11, while the holes in the plates 5 and 7 run perpendicular to the direction of movement of the switching pin 9.

When switching off, the arc arises between the tulip contact 10 and the tip of the Switching pin 9. The shape of the insulating plate 3 is now chosen so that through the notch 12 and through the at the top of the plate beginning transverse ao channel 11 the extinguishing flow after a very short way of the switching pin 9 can be used, so that the pressure increase in the chamber 2 is very low and the The arc can be extinguished at the first current zero crossing. Also be driven by the inclined arrangement of the transverse channel 11, the arc gases down and so from live parts kept away.

In Figures 2 to 4, the insulating plate 3 is shown with an inclined channel 11, the plates in Fig. 3 and 4, which are intended for switches of a higher voltage series, are arranged one above the other will. Here, in Figure 3, the channel 11 is arranged in a different direction than the channel 11 in Figure 4, see above that when the plates are arranged one above the other, the openings of the channels 11 do not lie one above the other come and so the arc gases cannot unite. By attaching a bar 12 on the plate 3, which extends to the switch wall, the channels open into separate rooms, so that one separate discharge of the arc gases from the channels 11 is ensured.

Claims (4)

PATENT CLAIMS: 1. Arrangement of quenching chambers for liquid switches with cross purging of the arc drawn in the chamber, the pressure arising in the quenching chamber driving the liquid gas mixture from a pressure chamber through transverse channels arranged in the chamber wall into a room with lower pressure, the channels being arranged within stacked insulating plates or are formed by these, characterized in that the transverse channel immediately adjacent to the stationary contact point runs obliquely in the direction of movement of the switch pin that the inner opening of the transverse channel is as close as possible to this contact point, while the outer opening faces away from the external live parts. 2. Arrangement according to claim 1, characterized in that the transverse channel in the chamber wall has a round cross-section. 3. Arrangement according to claim 1 and 2 for switches of higher voltage series, characterized in that that several of the contact point initially arranged insulating plates with one obliquely downward transverse channel are provided. 4. Arrangement according to claim 1 and 3, characterized in that the appropriate according to different Directional outlet openings of the transverse channels of superimposed plates through reaching up to the switch wall Longitudinal webs are shielded from one another. Considered publications:
British Patent Nos. 394 560, 477 702,
740787. 1 sheet of drawings © 309 510/369 2.63