DE1192723B - Arc extinguishing chamber for high-voltage switch-disconnectors - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

H02c

German class: 21c -35/10

Number: 1192723

File number: D 27950 VIII d / 21 c

Filing date: April 24, 1958

Open date: May 13, 1965

The invention relates to an arc extinguishing chamber for high-voltage switch-disconnectors, when switching off the arc from the fixed contact by the movable, round one Switching pin in a closed pressure chamber with a passage opening for the switching pin and is pulled out of this chamber through the opening previously closed by the switch pin. Within the pressure chamber here are two extending over the length of the chamber and by spring force adjustable in the movement path of the switching pin, emits gas when heated by the arc Plastic body provided.

In a known embodiment of arc extinguishing devices for high-voltage switch disconnectors Large-area plastic plates that emit gas when heated are used, between which the switch blade or switch pin is moved. The gap between the Plate is open on at least two sides so that the gas formed can easily escape at these points can. In these extinguishing devices, the gas should achieve a cooling of the arc, with the Arc between the fixed contact and the tip of the switch blade or switch pin can move freely in the gap, i.e. follow a curved or zigzag-shaped path can, whereby a large area of the plates comes under the action of the arc and avoided becomes that the arc must take a narrow, prescribed path on which the Arc electrically conductive deposits on the plates. Such extinguishing systems have the Disadvantage that the plates must get relatively large dimensions so that the switchfire exit to the both open sides is kept within limits and thus prevents flashovers to the neighboring poles will. Furthermore, the extinguishing gap between the two plates must be kept very narrow, so that the tracking knife is very thin and long and this type of extinguishing device for tensions over 20 kV cannot be produced.

Another disadvantage of these known devices is the fact that they are switched off frequently large currents wear the plate surfaces so that the extinguishing gap widens and the extinction of small currents due to the increased spacing of the gas-emitting plate surfaces is then made difficult or even impossible by the weak arc.

There are also arc extinguishing chambers for high-voltage switch disconnectors known in which arc extinguishing chamber for
High-voltage switch-disconnectors

Applicant:

Fritz Driescher

S'pecial factory for power station needs,

Rheydt

Named as inventor:

Fritz Hollmann, Rheydt;

Hans Emmerich, Rheydt-Giesenkirchen

Plastic bodies under spring pressure are used, which are spaced apart by the switch pin are held and after the switching pin has been withdrawn from the gap between the plastic bodies are moved against each other under the action of the springs. The width of the plastic body and thus the width of the gas-emitting surface of this body corresponds to the diameter or the Width of the switch pin. In these arcing chambers, the arc is the width of the Shift pin forced accordingly narrow way, so that a curved or zigzag run of the arc is not guaranteed, through which the largest possible plate surface of the effect of the Arc is exposed. The widening of the switch pin to achieve the widest possible However, the path would require an increase in the moving masses, thereby reducing the switching speed and the cost of mechanical means would be increased. This is also the case with a known liquid switch To find the execution of the plastic body and the switch pin, taking into account that the plastic body collapsing due to spring pressure, the liquid between the two bodies must displace.

The invention aims to improve both the arc extinguishers described above with rigid, large-area extinguishing plates as well as the arc extinguishing chambers of the known type Consideration that both the arcs of large currents and those of small currents through the resulting gas flow can be safely and permanently interrupted and extinguished. For cut-out arcs with a very small amperage is due to the wall cooling effect of the collapsing

509 569/315

Plates reliably extinguish the arc despite the small construction of the chamber and the moving parts guaranteed.

The invention is based on an arc extinguishing chamber for high-voltage switch-disconnectors initially mentioned and provides for the achievement of the stated goal that the plastic body are plate-shaped and much wider than the diameter of the switch pin. The plate-shaped design of the plastic body at the same time is much larger than the width Switching pin diameter allows the arc to move freely between the fixed contact and the switch pin too. The arc can find its way unhindered in the plate gap, with the Plates are brought into constant contact with the switch pin by spring action. The switch pin can be in low strength and thus the moving masses are kept small.

To the area around the arcing chamber in front of the large in relation to the size of the arcing chamber To protect the amount of hot escaping gases is in the direction of movement of the switch pin behind the Pressure chamber arranged an expansion chamber surrounding the switch pin. This and the following Features should not have an independent legal meaning and only in connection with the already mentioned feature of the invention be protected.

In the further practical embodiment, they are on the plate-shaped plastic body acting springs enclosed by telescopically extendable tubes, which at the same time guide the Plates are used to protect the springs from the hot gases.

In order to further expand the path of the arc and the area swept by the arc increase, you can use the plate-shaped plastic body on their facing surfaces Provided elevations and depressions having pattern arenas, in each case the elevations of the a plastic plate wells of the other plate are opposite.

To increase the length of the creepage path over the back of the plastic body compared to the The rear sides of the plastic body and the opposite sides can be spaced between their edges Walls of the pressure chamber can be provided with interlocking ribs and grooves.

In the drawing, an embodiment of an extinguishing chamber according to the invention is shown, and although shows

F i g. 1 the switch in the switched-on state in section,

F i g. 2 the switch during the switch-off process in cut and

3 shows a section, offset by 90 °, through the switch during the switch-off process.

On the metal base plate 1, the fixed contact 2, with which the switching pin 3 interacts, and the quenching chamber 4 are attached, which are divided into a pressure chamber Ab extending in the direction of the switching movement of the pin 3 and an expansion chamber 4c separated therefrom by a partition 4α is. In the pressure chamber 4 & plastic bodies 5, which are designed as plates, are arranged. Each of the plastic bodies 5, the width of which is significantly greater than the diameter of the switching pin, is under the action of four springs 6 which seek to press the plate-shaped plastic body 5 against one another. Each of the springs 6 is enclosed by a telescopic pipe guide 7 and thus protected against the ingress of hot gases. In the exemplary embodiment shown, the pipe guides 7 are made of the same materials as the chamber body 4 and the plastic body 5.

The arrangement of those under the action of the springs 6 and guided through the telescopic tubes 7 Plastic body 5 is such that when the switch is switched off, they are in contact with one another (Fig. 2). The switching pin 3 can therefore only pass between the plate-shaped plastic bodies 5, in that they are lifted from one another by the switching pin 3 against the action of the springs 6, be brought into engagement with the fixed contact 2.

If the switching pin 3 is withdrawn from the gap between the plastic bodies when it is switched off, a switching-off arc is created between its end shown and the stationary contact 2. This runs as in FIG. 2 and 3 is indicated, freely, ie in any curved or zigzag path between the plastic bodies 5, which try to move towards each other under the action of the springs 6 as soon as the switching pin 3 is pulled out between them. The heat of the arc vaporizes plastic from the surface of the plastic body 5. The gas generated by the heat of the arc flows from the pressure chamber 4 b through the passage opening previously closed by the switching pin in the partition 4 a into the expansion chamber 4 c and thereby causes the switch-off arc to be extinguished. When the arc is extinguished, the development of heat and thus the evaporation of the plastic of the plastic body 5 ceases.

When the plastic body 5 is knocked together, the amount of gas still present between them is also removed repressed. In this way, the path of the extinguished arc is intensively cooled, so that a re-ignition of the arc even with steepness of the recurring voltage and in particular even in difficult cases, e.g. B. by high natural frequency and low attenuation of the Difficult disconnection conditions are given, cannot occur. When switching on again of the switch, the plastic bodies 5 are moved by the switch pin 3 against the action of the springs 6 so far apart that the switching pin 3 through between them into engagement with the stationary Contact 2 can reach.

Claims (5)

Patent claims: 1. Arc extinguishing chamber for high-voltage switch-disconnectors, when switching off the arc from the fixed contact by the movable, round switch pin in a closed pressure chamber with a passage opening for the switch pin and from this chamber is pulled through the opening previously closed by the pin, with two extending over the length of the pressure chamber, inside the pressure chamber by spring force adjustable in the movement path of the switching pin when heated by the arc gas-emitting plastic bodies, characterized in that the plastic bodies (5) are plate-shaped and much wider than the diameter of the switch pin (3). 2. Extinguishing chamber according to claim 1, characterized in that in the direction of movement of the switching pin (3) behind the pressure chamber (4 b) an expansion chamber (4 c) surrounding the switching pin is arranged. 3. extinguishing chamber according to claims 1 and 2, characterized in that the on the plate-shaped plastic body (5) acting springs (6) of telescopically extendable tubes (7) are enclosed, which also serve to guide the plastic body (5). 4. extinguishing chamber according to claims 1 to 3, characterized in that the plate-shaped Plastic body (5) on their facing surfaces with elevations and depressions having patterns are provided, each of the elevations of a plastic body Opposite indentations of the other plastic body. 5. extinguishing chamber according to claims 1 to 4, characterized in that the backs of the plastic body (5) and the opposing walls of the pressure chamber (4 b) are designed, for example, with interlocking ribs and grooves that the length of the creepage path over the back of a plastic body (5) is considerably larger than the distance between the edges of the plastic body. Considered publications:
German Patent Nos. 767 713, 643 821, 711307, 708 433, 658 697, 581343, 670720;
U.S. Patent Nos. 2308 026, 2571864;
Siemens publication SSW 456/207. 1 sheet of drawings 509 569/315 5.65 © Bundesdruckerei Berlin