DE1012662B - Magnetic blowing device for the arc extinguishing of switches for direct and alternating current - Google Patents

Description

The invention relates to a magnetic blowing device for the arcing chamber of switches for higher voltages and larger ones Services.

It is known in arcing chambers to use magnetic blown fields. They have the task of removing the arc from the point of separation of the To drive the contacts of the switch away and into the arcing chamber, thus extinguishing the arc to enable, or dia re-ignition - with alternating current to prevent.

To generate such blown fields, blow coils are used, which are generally of the. to be switched off Current flowing through them. There are already blowing devices on quick switches known in which the poles of the blow tycoon are extended and broadened by attached metal sheets, in order to achieve the Blowing field to give a more effective shape. The pole iron of these blow magnets are only made according to the specifications of the required arcing chamber field.

The disadvantages of the known blowing devices are that the service life of the short-circuit current (arc) at the point of separation of the contacts several msec. This fact leads to an extremely high wear of the contact pieces, especially at high. Short-circuit currents.

To avoid this disadvantage, it has already become known in magnetic blowing devices for arc quenching of switches, for direct and alternating current with blow coils and blow iron resp. Blower plates; two arranged one behind the other in the direction of movement of the arc and spatially from one another to use separate blowing fields, of which, the first, exclusively on the separating point of the Contacts is concentrated and the second serves to support the. To drive the arc into the arcing chamber. the known devices of this type are designed so that they couple the two magnetic fields allow, so that the concentration of the Blasfeld.es directed at the contact opening point certain Values cannot exceed. In addition, the known devices for generating of the blown fields blown coils used, their scope and accommodation of the reinforcement of the blown field at the point of separation of the contacts sets limits. Furthermore, it is already known To limit the expansion of the arc, provide switches with two blowing fields, one of which is focused on the opening point of the contacts and the other is used to. Arc, in to intercept its movement and drive it back towards the contacts. In contrast, however, exists the object underlying the present invention is to provide a blower for a Magnetic blowing device for the

Arc quenching of switches

for direct and alternating current

Applicant:

Siemens-Schuckertwerke

Corporation,

Berlin and Erlangen,

Erlangen, Wemer-von-Siemens-Str. 50

Dr.-Ing. Arnold Einsele, Berlin-Siemensstadt,
has been named as the inventor

To create switches through which the switching arc that occurs moves away from the contacts as quickly as possible. and is blown into an arcing chamber. An interception of the arc in its movement into the It is not intended to put in the extinguishing chamber.

According to the invention, the known! Facilities thereby simplified and. improved that to generate the two blower fields two pairs of blower plates are provided, which are so far apart that the magnetic field lines of the one Couple not disturb those of the other couple. By using such pairs of blown plates achieved a very simple and space-saving structure of the entire blower, while through the specified dimensioning of the distance between the pairs of blower plates ensures that the concentration the blow field on the opening point of the contacts reaches a maximum,

Not only two pairs of blower plates, each from a special one, can serve to generate the blower fields Blowing coil are energized, but, the arrangement can also be made so that only that The first pair of blown plates is energized by a blower coil, while the second pair of blown plates is not energized by a special blow coil, but is excited by the current in the usual arc guide.

A self-contained frame made of magnetic material can also be attached to the position of the second pair of blower plates well conductive material.

In, in all of these, cases it is vital that the two be placed one behind the other. Blowing devices are magnetically completely separated from each other, in particular to increase the concentration of the first, blown field on the separation point of the contacts

709 5S9 / 210

not to deteriorate, d. i.e., both of them have to Blasblechpaare so far separated from each other that the magnetic, field lines of the one pair Do not disturb the magnetic field lines of the other pair.

In the drawing is'ein embodiment of magnetic blowing device according to the invention shown for example *

Fig. 1 shows an arc extinguishing chamber in side view,

FIG. 2 shows a section along the line I-I of FIG. 1 and -

Fig. 3 a. Cut through the. Frame according to line H-II of FIG. 1, but without a blowing coil.

In Figs. I and 2, 1 and 2 are the arcing chamber walls, which are made of asbestos slate, vulcanized fiber, ceramic or the like exist. The blower plates 3 and 4 are directly above the separation point of the contacts 5 and 6 arranged.

In FIG. 2, the second pair of blower plates 7, 8 cooperating with the first pair of blower plates 3, 4 can be seen.

As FIG. 1 shows, the blower coil 9, which excites the pair of blower plates 3, 4, is located under the blower plate 3. In the direction of movement of the arc over the first pair of blower plates lies the second pair of blower plates 7, 8, which is excited by a second blower coil 10. The blow coils 9 and 10 can, for example, be connected in series and the current to be interrupted flows through them.

Fig. 3 shows the above-mentioned particularly advantageous embodiment of the blowing device according to the invention in sectional view. Here is the second pair of blower plates through a self-contained one Frame made of magnetically highly conductive material 11 replaced.

. The invention is not limited to those shown Execution forms. So can the blower plates z. B. also in a manner known per se in the extinguishing chamber walls be embedded in order to make the distance between the two pole faces as small as possible.

The special advantages of the new. Blower can be seen in the fact that with this new facility Equipped switches can handle much larger switching currents than switches without them. Furthermore, the switch-off time of the switch is noticeably reduced.

Although two blowout fields are hintereinan.dergeschalt.at in the new blower, the switch can be made very much smaller and lighter than when using the previously known blowing devices, because the specific K & a clock-load may be significantly higher.

Claims (4)

Patent claims: 1. Magnetic blowing device for the arc extinguishing of switches for direct and alternating current with blow coils and blow iron or blower plates, in which two spatially separated blowers are used in the direction of movement of the arc, the first of which is ausscS ||| ß _: r borrowed is concentrated on the separation point of the contacts and the second is used ^{to drive the arc 1} Jn the arcing chamber, characterized in that to generate the two. Two pairs of blower plates are provided which are so far apart that the magnetic field lines of one pair do not interfere with those of the other pair. 2. Magnetic blowing device according to claim 1, characterized in that only Sas first pair of blower plates has a blower coil, while the second pair of blower plates from the stream into the usual arc guide plates is excited. 3. Magnetic blowing device according to claim 1, characterized in that the Place the second pair of blower plates in a self-contained frame made of a magnetically good conductor Material occurs. 4. Magnetic blowing device according to claim 1 to 3, characterized in that the Blower plates or the frame in on. known way in, the arcing chamber walls are embedded. Considered publications:
German patent specifications No. 408129, 540 © 27, 700728..;,; .. 1 sheet of drawings ■■■; ■ " ¹ p © 709 5 & S / 210 7.5T