DE1016796B - Loeschkammer for electrical fluid switch with cross flushing - Google Patents

Description

The invention relates to an arcing chamber for liquid switches, particularly high power and high voltage with cross purging of the arc drawn in the chamber. The in the extinguishing chamber generated gas pressure via channels arranged along the switching pin bore in the chamber are, the liquid gas mixture in cross channels, flushes and extinguishes the arc and arrives from here directly into the pressure-free space. It has been shown that at high short-circuit currents such as Even when extinguishing low-current arcs, the flow velocity does not always occur sufficient to extinguish the arc quickly and effectively. Also increasing the number of side by side arranged transverse channels did not lead to a satisfactory result.

In order to obtain a more effective purging of the arc drawn in the chamber, is according to the invention a liquid space is arranged between several transverse channels arranged in the chamber, the contents of which during the shutdown process are caused by the pressure of the arc gases through longitudinal ducts to the adjacent ones Ouerkanal is fed. The Ouerkanal, which is adjacent to the contact point in the arcing chamber are primarily used to extinguish short-circuit currents, while those on the other side of the transverse channels located in the middle of the extinguishing chamber the extinguishing of low-current arcs become effective. The one in the middle of the quenching chamber Pressure generation space is sufficient, the two arc extinguishing points for all currents occurring flush with a reliable extinguishing agent flow.

In order to prevent the liquid / gas mixture escaping from the transverse channels into the open at high temperature from reigniting outside the chamber of the arc, the transverse channels arranged on both sides of the liquid space can open out into the open on different sides of the extinguishing chamber.

It is not advantageous that the arcing chamber space in which the contact point is located has a Longitudinal channel, which runs in the direction of the switching pin bore, is in communication with the transverse channels. When switching off high short-circuit currents, such a large conductive gas bubble can be formed that at high recurring voltage, a flashback takes place via the longitudinal channel. This is avoided if the arcing chamber space that accommodates the contact points does not have a longitudinal channel, but only is in connection with the initially located Ouerkanal via the switch pin hole.

In order to switch off the gas at the moment

for electric liquid switches
with cross flushing

Applicant:

Voigt & Haeffner Aktiengesellschaft,
Frankfurt / M., Hanauer Landstr. 142-172

Dipl.-Ing. Frobert Michaelis, Frankfurt / M.,
has been named as the inventor

The switching pin with a hole is used to promote the onset of the extinguishing flow so provided with cross bores at different distances that the Liquid that is in the outer channels adjacent to the contact area is already in motion sets before the switch pin has released the connection to the outer channels. This creates a quick extinguishing is achieved, and the low back pressure prevents excessive pressures from building up. Also occurs through the Ouerbbohrungen in the switching pin the advantage that when switching on liquid displaced by the switching pin can escape from the chamber. Above all, however, can Use the hole to compensate for the pressure that occurs during the start-up arc. Even in quick succession On / off switching, this pressure equalization has the advantage of pre-acceleration of the extinguishing agent.

The drawings serve to explain the invention.

Figure 1 shows a section through the arcing chamber.

In the pictures 2 to 6 some of the insulating plates arranged in the chamber for the formation of the Ouerkanal shown seen from above.

1 is the arcing chamber, inside of which the contact point 2 is located. 3 is the switch pin with the Longitudinal bore 4 and the outer bores 5. 6 to 9 are openings in the quenching chamber wall where the hot gases can flow out of the Ouerkannels 10 to 13 during the shutdown process. The cross channels 10 to 13 are formed by stacking the insulating plates 14 to 23 with the end part 24. 25 is the pressure generating space provided according to the invention. This room stands with the transverse

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channels 10 to 13 via longitudinal channels 26 ,, 27 in connection. The insulating plate 14 is designed so that the longitudinal channel 26 is not in the contact space 28, but ends in the transverse channel 10.

In Figures 2 to 6 the plates 14 to 18 are shown seen from above. All plates have the Hole 29 for the passage of the switching pin 3 and also for guiding the extinguishing agent extensions or cutouts to effectively flush the arc drawn by the switch pin. The one in the flow path lying edges of the insulating plates are bevelled so that the flow is not obstructed.

In Figure 1, switching points 2, 3 in the extinguishing chamber are closed. The extinguishing chamber is housed in a liquid container, which is not shown. The space 28 is connected to the outside space via the transverse channel 10 and the opening 6 via the switching pin bore 4 and the uppermost transverse bore 5. If the switching pin 3 is moved upwards during the shutdown process and the tip of the switching pin has not yet left the hole 29 (Fig. 2) in the plate 14, the pressure generated by the arc in the lower chamber space 28 can pass through the longitudinal hole 4 and the transverse holes 5 in the Actuate switching pin on the liquid in the outer channels 10 and 11 and set them in motion, so that when the opening 29 is subsequently released in the plate 14, there is no dynamic pressure, rather one

Extinguishing agent flow is available. If the arc is also in room 25 drawn, which is the case when a low-current arc is extinguished, the content of this chamber space is drawn driven via the longitudinal channels 26, 27 and from here via the transverse channels 10, 11 and 12, 13, respectively. There in If the arc cannot avoid these transverse channels, it is safely extinguished. The openings 6, 7 or 8, 9 in the chamber wall for the exit of the extinguishing agent open in opposite directions

Sides so that a flashback over the exiting hot gases outside the chamber, especially when the voltage is high, cannot enter can.

Claims (4)

Patent claims: 1. Extinguishing chamber for liquid switch with cross purging of the one drawn in the chamber Arc, whereby the gas pressure generated in the quenching chamber transfers the liquid gas mixture Channels arranged parallel to the switching pin bore in the chamber into the outer channels and from here drives directly into the pressure-free space, characterized in that between several in the chamber arranged transverse channels, a liquid space is arranged, the content of which during the shutdown process is fed to the adjacent outer channels via longitudinal channels. 2. extinguishing chamber according to claim 1, characterized in that the on both sides of the liquid space arranged transverse channels open into the open on different sides of the extinguishing chamber. 3. arcing chamber according to claim 1 and 2, characterized characterized in that the arcing chamber space, which receives the contact point, does not have a Longitudinal channel, but only via the switch pin hole with the initially lying transverse channels in Connection. 4. extinguishing chamber according to claim 1 to 3, characterized in that the provided with a bore Switching pin is provided with cross bores at different intervals so that when Switching off the liquid in the transverse channels adjoining the contact area is already in motion before the switch pin establishes the connection to the transverse channels has released. 1 sheet of drawings © 709.699 / 301 5. 57