DE7015884U - ARC EXTINGUISHING DEVICE FOR CIRCUIT BREAKER. - Google Patents

Description

SIEMENS AKTIENGESELLSCHAFT Aktz. G 70 158 84.8 Gbm

Berlin and Munich _{ττ η} . , _ττΎ .. "_ / _ ~ _no -

Our reference: YPA 70/3085

Arc extinguishing device for circuit breakers

The innovation relates to an arc extinguishing device for circuit breakers with electrical contact parts Conductively connected arc guide rails and quenching plates that are isolated from one another in between.

In the case of arc extinguishing devices of the type mentioned above, copper or steel rails have previously been used for the arc guide rails used, through which the arc was pulled from the actual contact parts and passed into the quenching chamber. To the To improve arc extinction, dci arc in Individual arcs divided by the arc splitter. Through this it is possible to accelerate the extinguishing of the arc. The invention is intended to provide such an arc extinguishing device to the effect that in addition to the arcing voltage generated in the arc chamber to the Guard rails drop a voltage that helps improve the extinguishing conditions. This is according to the invention "" achieves that the arc guide rails at least!: · => · * '..> se essentially wavy or trapezoidal in Schiener.l; .g direction get lost.

the length of the arc extinguishing device as small as possible to hold, it is advantageous if the arc guide rails are formed wave-shaped. To keep the arc running up to To influence entry into the quenching plates as little as possible, it is advantageous if the arc guide rails in light

- 2 -

- 2 - VPA 70/5085

bogenlr-.ui'richtut;, ;; have some interferences which. over Rail parts on the side facing away from the arc of the light

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Resistance to the parts of your sight! the dor width of the Point of interruption o is the corresponding air resistance. the Conjutation of the arc! /, From the contact parts to the Arc] eitrchionen up to the entry into the quenching plates is significantly improved when the arc guide rails consist of a material that with increasing temperature shows a strong increase in resistance. Here see .for the electric arc: the carbonyl iron has proven its worth.

Using the drawing, examples of execution are shown in the Invention written down and the efficacy explained in more detail. Show it:

Fig. 1 and 2 an arc extinguishing device with Lichtbogonleitrchienen Made of V / resistance material in top and bottom Side view, partly in section,

Fig. 3, 4 and 5 arc extinguishing devices in which the Lichtbogerileitcchienen at least partially wave-shaped are trained.

The same parts and in all the figures have the same reference numerals Mistake.

The arc extinguishing device for circuit breakers consists of the. Arc guide rails 1 and 2, between the electrical insulated the quenching plates 3 are introduced. Limit housing parts 4 the arc extinguishing device parallel to the arc. The arc guide rails are electrically conductive over parts the StroEZufleitungen 5, 6 cit connected to the contact parts 7 and 8,

In Fig. 2, three with the reference numerals 9, 10 and 11 are provided Positions of the arc indicated, which are thrown in one after the other when separating the contact parts 7 and 8 from the arc will. The resistance of the power leads 5 and 6 to the

- 3 - VPA 70/3055

Contact power Part C-η 7 and 8 is negligible kloin, 30 da.?· in that upon the occurrence of a relatively large Licln; br> / - ens in or. s position 9 hardly any noticeable voltage drop reduces the supply voltage and thus limits the short-circuit current. The arc coincides from the contact parts 7, 6 on the Leitcchienen 1 and 2, for example in the position; 10 of the arc, since the arc guide rails 1 and 2 are made of a material with a specifically higher Yiiderstar.d than the power supply lines 5 and 6, there is an additional Si.approach drop caused by the arc current, which is added to the arc voltage inu.'3. It can thus be seen that even here, as soon as the arc is closed, better extinguishing conditions exist a'Js at. an arc piercing device with an arc! eit:; chiene :: made of copper. The resistance of the arc guide rails ni:.,:; T as the arc progresses towards position 11. The prerequisite, however, is that the arc does not hit the arc guide rails at a corresponding speed so that the arc cannot run back with certainty. Such accelerations of the arc can be generated, for example, by exploiting pressure waves when the arc arises.

In Fig. 3 an embodiment is shown in which the arc guide rails 1 and 2 are equipped with bent parts 12, 13, which make it possible to shorten the length of the arc extinguishing device. The advantage of this facility is that the Ko ::. ^T 'utior'jr: g of the arc bent after these. Parts 12, 13 on the arc guide rails 1 and 2 takes place. In execution ^ example after Pig. 4, the arc guide rails 1 and 2 have narrow interruption points 14, which over rail parts Ί-; on the side facing away from the arc of the arc. ^ eit: ": c:. rails 1 and 2 are bridged. The rail parts 15 sinc, v, -io.-ir any resistance that can be achieved through these rail parts

- 4 - VPA 70/3065

can be determined. Un to avoid ¹ that the arc is burning on the Untci'brechungsstellen 14, Ava would mean a further subdivision of the arc, however, the running speed impair gene would not insignificantly must ensured v / ground that smaller the resistance of the rail parts, in particular is significantly smaller than the air resistance corresponding to the width of the interruption point for 0 <s arc. The number of rail parts 15 within an arc guide rail 1 or 2 can be selected so that the arc just enters the quenching plates 3 with the greatest possible short-circuit current.

In Fig. 5 is a similar embodiment of the arc extinguisher shown as shown in Fig. 3, here in a simple manner also for the embodiment according to Fig. 3 required width can be significantly reduced v / ground. The waves shown here extend the arc guide rail practically in an advantageous manner. three times that without requiring a large space, because the arc commutates here to the parts of the arc guide rails 1, 2 that lead directly to the release plates 3. These parts are with 16 and 17.

As the exemplary embodiments show, the cross-section of the guide rails depends on the maximum permissible arc current for the switching device and can therefore not be reduced at will. The exemplary embodiments according to FIGS. 3 to 5 offer themselves therefore particularly suitable for switching devices with a relatively large short-circuit current.

In order to also reduce short-circuit currents in a circuit breaker with an arc extinguishing device for relatively large currents To be able to erase, it is advantageous if the guardrails are made of a single material with a high temperature coefficient, i.e. made of a material whose specific resistance increases with increasing temperature, such as carbonylcisenium, exist. Because at the moment of the creation of the arc

701588424.6.71 - ⁵ -

- 5 - VPA 70/3085

When the contact parts 7 and 8 are separated, the temperatures are still relatively low, the commutation is also ^{favorable when such guide rails de>} Y.r'L1, since the resistance increases with increasing temperature.

6 claims
b figures

Claims (5)

Actζ. G 70 158 84.ο Gbm Our reference: VPA 70/3085 iche 1. Arc extinguishing device for circuit breakers with with the Kentaktteile electrically conductively connected arc guide rails and intervening, from each other insulated release plates, characterized in that the arc guide lines (1, 2) at least partially run essentially in a wave-like or trapezoidal shape in the longitudinal direction of the rails. 2. Arc extinguishing device according to claim 1, characterized in that that the arc guide rails (1,2) in the direction of the arc have narrow interruption points (14), B the via Pchienenteiie (15) on the facing away from the arc Side of the arc guide rails (1,2) are bridged, the switched-on resistance of the rail parts is smaller than the air resistance corresponding to the width of the interruption point (14). 3 · Arc extinguishing device according to claim 1 or 2, characterized characterized in that the arc guide rails (1,2) from consist of a material that shows a stronger increase in resistance with increasing temperature. 4. Arc extinguishing device according to claim 1 or 2, characterized characterized in that the arc guide rails (1,2) are made of carbonyl iron. 5. Arc extinguishing device according to claim ". Or 2, characterized characterized in that the arc guide rails (1,2) made of resistance material, such as chrome-aluminum alloys, exist. 701S88424. «. 71