DE1222564B - Gas pressure switch - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. GL:

HOIh

German KL: 21c-35/10

Number: 1222 564

File number: S 95198 VIII d / 21 c

Filing date: January 28, 1965

Opening day: August 11, 1966

A compressed gas switch is known in which the movable contact piece is pneumatically actuated Pistons in one switching direction and in the other switching direction by a spring in motion is set, which is held taut with the help of a pawl. A cross serves as a latch Rod movable to the piston, which is actuated by an electromagnet placed at ground potential can be and in the locked position protrudes into a recess of the piston. There are contacts on the pole provided, which result in a position report. Since the bar acts as a latch, the size is the recess matched to the cross section of the rod. This is why the Contacts not in the two end positions of the switching movement, but already in a small area of the switching stroke in the vicinity of one end position. This means that it can be in the area of the other end position get false reports. In addition, the known arrangement requires great forces for actuation the rod, because the movement of the rod must be done almost suddenly.

The invention also relates to a pressure gas switch, in particular with sulfur hexafluoride as Extinguishing agent and a piston for the pneumatic actuation of the movable contact piece, with im Piston a recess is provided into which a transverse to the piston movable, under the action can collapse a spring standing rod and thereby actuate a signaling switch.

In contrast to what is known, according to the invention the cutout is in section over approximately the whole Inclined plane extending to the length of the piston. This gives a gradual transition from a position of the rod, which corresponds for example to the switched-on position, to the other in which the Switch-off position is reported. In addition, the inclined plane enables a so-called fault message in the intermediate positions of the contact piece, so that it is detected with certainty whether the switch is closing the or has really fully reached the switch-off position.

It is expedient to give the piston an essentially conical shape corresponding to the inclined plane to give, because with such a rotationally symmetrical arrangement one is independent of the radial Position of the piston in relation to the rod.

For switches with a closed gas circuit, it is advantageous to assign a metal bellows to the rod, which serves to seal against the inside of the switch. Here you can see the already considerable Use the length of the rod for this purpose, a metal bellows pressure gas switch

Applicant:

Siemens-Schuckertwerke Aktiengesellschaft,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Named as inventor:
Werner Kohler,
Gerhard Rößger, Berlin

to use large dimensions in which the deformation remains small. With a switch housing, in which the rod in a channel leads to parts with earth potential, the metal bellows on the be arranged on the earth-side end of the channel,

ao so that the dimensions of the metal bellows does not require an increase in the insulating distance.

Furthermore, the invention can be perfected in that the rod is not directly connected to the Piston wall cooperates, but via a role that reduces friction. This role will conveniently carried off the peg.

To explain the invention in more detail, an exemplary embodiment is described below with reference to the drawing:

The medium-voltage pressure gas switch shown in the figure has one made of cast resin Switching chamber 1. This is secured with the help of two post insulators 2, which are also made of cast resin and 3 attached to a grounded metal kettle 4.

A channel 28 is also connected to the boiler 4 in a gas-tight manner, which is located in a thickening 29 of the cast resin body the switching chamber and an insulating rod 31 contains. The insulating rod 31 interacts via a roller 30 with the outside of a piston 14 and leads to a ground potential arranged signaling switch 32. The channel provided for the rod is inside the boiler 4 sealed by means of a bellows 33 which is attached to the earth-side end of the rod.

The metal boiler is divided into a low-pressure container 5 and a high-pressure container 6. in the A high-pressure tank sits a valve (not shown) that controls the blowing and actuation of the switch with the sulfur hexafluoride (SFe) used as the compressed gas.

The switching path of the switch includes a fixed contact 10 with contact fingers 11 and

609 609/274

a burning pen 112. The moving contact piece is a hollow movable switch pin 13, which is attached to the drive piston 14 and in the switched-on position protrudes through an insulating nozzle 15 into the stationary contact piece 10.

The piston 14 slides on a tube 20. The annular space between the tube 20 and the wall of the Switching chamber 1 can be brought into connection with the high-pressure container via a channel 21, so that the piston 14 with the switching pin 13 is pressed into the switched-on position.

A pipe section 22 leads from the pipe 20 into the upper part of the switching chamber 1. There is a metal container 25 and a connecting piece 26 attached, which close the switching chamber 1 at the upper end. The metal container 25 is connected to the low-pressure container via a channel 27 with a support insulator 3 5 of the switch in connection.

The figure clearly shows that the piston 14 is conical over almost its entire length is formed and thus forms an inclined plane 40 with respect to the rod 31. In the illustrated On position, the rod 31 rests on the highest point of the inclined plane and delivers the position report "A".

If high pressure gas is supplied through the support 2 to switch off, the drive piston 14 starts moving upwards. The rod 31, which is pressed against the piston by a spring, for example the metal bellows 33, scans the circumference of the piston. As a result, the signaling switch 32 is brought into the so-called fault position during the switching stroke, in which there is no longer an “on” message and no “off” message is present. The "off" message is only given when the piston with the switch pin 13 reaches the switch-off position in which the rod 31 with the roller 30 is located at the lowest point 41 of the inclined plane 40.
5

Claims (5)

Patent claims: 1. Pressure gas switch, in particular with sulfur hexafluoride as an extinguishing agent and a piston for ίο pneumatic actuation of the movable contact piece, a recess being provided in the piston is, in which a transversely to the piston movable under the action of a spring Can collapse rod and thereby actuate a signaling switch, characterized in that that the recess in section extends over approximately the entire length of the piston is crooked © level. 2. Compressed gas switch according to claim 1, characterized in that the piston © ine essentially has a conical shape corresponding to the inclined plane. 3. Compressed gas switch according to claim 1, characterized in that the rod has a metal bellows carries, which serves to seal the interior of the switch. 4. Compressed gas switch according to claim 3, wherein the rod in a channel of the switch housing leads to parts with earth potential, characterized in that the metal bellows on the earth side End of the channel is arranged. 5. Compressed gas switch according to claim 1, characterized by a preferably off the shelf supported roller, which is supported against the piston. 1 sheet of drawings