DE1167937B - Electric switch - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: H 02 c

Number: File number: Registration date: Display day:

German class: 21c-35/05

S 77913VIIId / 21 c February 6, 1962 April 16, 1964

Electric switches in general and with magnetic ones Arc-extinguishing switch-disconnectors in particular are equipped with an arcing chamber equipped, which has obstacles on which the arc pushed during the switch opening process and is thus pulled apart. This is most often done using a magnetic field. This magnetic field can be generated between two pole pieces by an extinguishing coil. During the The switching opening process, the arc to be extinguished is connected in series with the said coil, which supplies the ampere-turns necessary for shifting and extinguishing the arc.

On the other hand, in energy networks with large short-circuit currents To be able to install switching devices, of which one only has a low separation capacity requires, it is essential that these switching devices to the maximum short-circuit current of the relevant Network can be closed. It follows from this that during the closure of such Switching devices to high currents is necessary to avoid starting the quenching coil.

The invention now relates to an electrical switch in which during the opening process a movable arm, preferably a switch blade, with an extinguishing coil via a conductive spring tongue the electric arc to be extinguished is electrically connected in series, so that this extinguishing coil only occurs during the opening process and not during the closing movement of the switch.

This switch is essentially characterized in that, according to the invention, the conductive Spring tongue is arranged and designed such that it is outside during the closing process of the pivoting path of the movable arm and only during the final phase of this closing movement, if the movable arm has already touched the fixed main contact, into the swivel path guided and in this position during part of the opening movement of the movable arm is held by a correspondingly designed spring-loaded latch assembly.

Due to the measure proposed according to the invention, the quenching coil remains during the Closing process of the disconnector de-energized, while already known switches of the aforementioned Art neither lead to this nor to a similar result, since with all of them the blow or Extinguishing coil both during the closing process and during the opening movement of the disconnector below Power is set. The circuit breaker according to the invention also has the advantage that the Trennlei-Elektrischer counter

Applicant:

Societe Generale de Constructions Electriques
et Mecaniques (ALSTHOM), Paris

Representative:

Dipl.-Ing. Dipl. Oec. publ. D. Lewinsky,

Patent attorney,

Munich-Pasing, Agnes-Bernauer-Str. 202

Named as inventor:

Gilbert Verine, Etang-la-Ville, Seine-et-Oise

(France)

Claimed priority:

France 7 February 1961 (2252)

Stung such switch to be able to increase, since the backward movement of the spring tongue in its normal position after separation from the movable arm, the movement concerned of the movable one Arms adds, so that the speed of separation of these two organs is increased.

Further features of the invention and advantages achieved by it can be found in the description of FIG Drawings showing a circuit breaker of the type according to the invention in an exemplary embodiment illustrate schematically.

Fig. 1 shows a designed according to the invention electrical switch. The jaws 1 and 2 are connected to the power input and output terminal of the Switch connected and also in the closed state of the switch among each other by the Switch blade 3 connected, which is in the position 3 'after opening the switch.

A spring tongue 4, which is electrically connected to one terminal of an extinguishing coil 5, the other The clamp is connected to the clamping jaw 1, is pivotably arranged about the axis 6 and is located when the switch is turned off outside the pivoting path of the movable arm 3 due to the action of the spring 7. Fig. 2, which in F i g. 1 illustrated switch illustrated in a partial view, shows the spring tongue 4 in this position denoted by 4 '.

During the closing of the switch, the spring tongue 4 moves from position 4 'to position 4

409 559/471

moved the toggle bolt 8, which is hinged at 9 and with the pin 10 carried by it on the Spring tongue 4 is supported. The natural position of this bolt 8, in which it is of a not shown Spring is withdrawn, is shown in phantom at 8 '. The spring tongue 4 has a cam 11. The coil 5 generates a magnetic field between the pole pieces 12 and 13, which enclose the arcing chamber 14.

The function of the switch is as follows: When the switch is open, the switch blade 3 is located in position 3 ', the bolt 8 and the spring tongue 4 in their positions 8 'and 4'. The movable knife 3 moves during the closing process from position 3 'to position 3; the distance between them the end of the knife and the spring tongue in position 4 'remains larger than the Distance between knife 3 and clamping jaw 1. At the end of the closing movement and only when the knife 3 already moves into the clamping jaw 1, the closing knife 3 strikes the tilting bolt 8 and brings it from the position 8 'to the position 8. The pin 10 of the tilting bolt 8 sliding on the spring tongue 4 guides the spring tongue 4 out of the position 4 'in position 4.

During the opening process of the switch, the closing knife 3 is supported on the spring tongue 4 and brings it into position 4 ". In this position, the cam 11 holds the pin 10 back; the The bolt 8 remains in the position 8 'and keeps the spring tongue 4 still in contact with the movable one Knife 3, which here is in position 3 ″. The coil 5 is therefore supplied with current.

As soon as the switch blade 3 leaves the outermost end of the spring tongue 4, various phenomena occur a. The tear-off sheet hangs between the end of the knife 3 and the end of the spring tongue 4. He is here in the magnetic field of the pole pieces 12 and 13 and is thereby in the arcing chamber 14 drawn. Due to the elasticity, the spring tongue reverses during the further switch-off movement 4 back from position 4 "to position 4, releasing the toggle bolt 8, which is in position 8 ' is withdrawn and which triggers the spring tongue 4 during its movement; the latter is under the influence of the spring 7 is withdrawn into position 4 '.

The free pivoting space of the spring tongue between positions 4 and 4 'lets the arc into the Enter extinguishing chamber 14 deep, which thus works under better conditions. The slewing speed of the free end of the spring tongue 4 is added to the corresponding opening speed of the switch blade 3, whereby the separation efficiency of the switch is increased.

Claims (4)

Patent claims: 1. Electrical switch, in which a movable arm, preferably during the opening process a switch knife, an extinguishing coil with the one to be extinguished via a conductive spring tongue electric arc switches electrically in series, characterized in that the conductive spring tongue (4) is designed and arranged in such a way that it moves during the closing process (4 ') is outside the pivoting path of the movable arm (3) and only during the final phase of this closing movement, when the movable arm (3) makes the fixed main contact (1) has already touched, led into the pivoting path and in this position during a part the opening movement of the movable arm by a correspondingly designed spring-loaded Latch assembly (7, 8) is held. 2. Switch according to claim 1, characterized in that the spring tongue (4) is in its Position during the closing process of the switch and at the end of the opening movement (4 ') in the Located inside the extinguishing chamber (14). 3. Switch according to claim 1 or 2, characterized in that the spring tongue (4) around a Axis (6) is pivotably mounted and towards the end of the switch closing movement of one on her sliding and by the movable arm (3) out of its normal position (8 ') out of the toggle bolt (8) is displaced. 4. Switch according to claim 3, characterized in that the spring tongue (4) with a Cam (11) is equipped, which is attached to the pin (10) of the toggle bolt (8) during the switch-off process is applied, and that the movable arm (3) slightly pushes back the spring tongue (4 ") during the switch opening process, wherein the cam (11) prevents the toggle bolt (8) from returning to its normal position. Considered publications: German patent specifications No. 266 745, 411 815, 229,668 581,702 431. 1 sheet of drawings 409 559/471 4.64 © Bundesdruckerei Berlin