DE1071815B - Feedback device for isolating switches with piston drive - Google Patents

Description

GERMAN

It is known to provide a position feedback in switchgear, in particular in the case of multi-pole high-voltage switches that indicates whether the switching contacts or their drives are after the Circuit completely in a prescribed position, e.g. B. in the end positions are indented.

A special feedback system is used for feedback, e.g. B. one with a Pressure medium operated system of valves, either in the switchgear cubicle or on a separate one Places are arranged in the open air.

Naturally, there is a separation of the switching and feedback elements, which may still be Several mechanical or electrical intermediate links are included in the chain of the operational sequence, many sources of error with it. In this way, the feedback can pass through with a separate valve system in open-air systems Weather conditions, e.g. B. in extreme cold by freezing of the intermediate valves, fail.

Solutions in which the piston actuator of the switch also acts as a switching element for the Feedback is also used (see German patents 676 907 and 687 080). In a special one Embodiment is the piston rod of the double piston drive in such a way as a switching element used that an inclined cross hole in the same can be switched into the feedback path.

Otherwise, however, the known solutions are matched or limited to single-pole disconnectors. In contrast, the invention shows a way in which the advantages associated with the combination of feedback switching element and piston drive in one organ can also be achieved with multi-pole switches. Here are instead of transverse bores in the piston rod channels in the piston, in particular A ^T utausfräsungen. used. The solution is that the feedback line is routed from the pressure area of a double piston system to the feedback arrangement via connections in the cylinder walls of the remaining double piston systems, which in turn are switched on through the piston channels in the feedback path when the piston is in the feedback position.

The drawing illustrates an embodiment of the new feedback device; it shows

Fig. 1 in a schematic representation of the piston drives of a three-pole switch? in one end position,

2 shows a section through a piston of the arrangement according to the line H-II of Fig. 1,

Fig. 3 selects the middle piston in one position. end of the switching process.

In the schematic representation according to FIG. 1, the double piston drives for actuating a three-pole switch consist of the double piston 1, 2, 3 feedback device for disconnectors
with piston drive

Applicant:

Siemens-Schuckertwerke

Corporation,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Dipl.-Ing. Eduard Luithle, Erlangen,
has been named as the inventor

and the double cylinders 4, 5, 6. In addition to the always existing inlet openings for the pressure medium, z. B. compressed air, which occurs depending on the switching command either at 7, 8, 9 or at 10, 11, 12, the individual double cylinders also have six connections, three of which are assigned to one end position and the remaining three to the other end position of the double piston .

The double cylinder 4 therefore also has connections 13 to 18, and the double cylinder 5 also has the connections 19 to 24 and the double cylinder 6 in addition the connections 25 to 30. They are represented by circles, of which the fully marked ones Circles indicate that the corresponding connections are not used, e.g. B. are screwed. By Other connections that are not fully marked with circles are labeled with feedback conductors Link.

These are guided over Rücknieldckaniilc, which penetrate the double pistons 1, 2, 3, preferably transversely to the axis of symmetry. I) ^; e feedback channels connect each. two of the above connections when the piston drive reaches its end positions. So the pistons are .ils switching elements for the. Rüeknield line also used. The design of the feedback channels can be chosen differently. As FIG. 2 shows particularly clearly, they are designed here as line-shaped recesses. They are advantageously arranged between the two outer piston rings. UU (I their dimensions result from the distance

909 690/448

Claims (3)

and the diameter of the connections for the feedback lines. The two inner piston rings in each case seal the pistons against undesired escape of compressed air to the outside. When switched on ■ - as shown in Fig. 1 is based - one of the feedback lines, starting at connection 18, is connected to the feedback in the compressed air control unit via connections 22, 24 and 28, 30. The circuit is made in such a way that the same medium, compressed air in the exemplary embodiment, is used both to actuate the double pistons 1, 2, 3 and the feedback device. When the double pistons are in the opposite position in the switched-off state, the connections 13, 20, 21, 26, 27 are switched through to the feedback indicator via the double pistons. Conversely, if the feedback path is blocked by a piston in the above-mentioned positions, the feedback indicator indicates the fault. For a more detailed explanation, reference is made to FIG. 3, in which the double piston 2, during its movement into the "off" position, has interrupted the feedback line through the connections 22, 24 initially connected to one another via the groove 34 in order to restore it to its new position To close the end position via the connections 20, 21 again. The movement under consideration is also carried out by the remaining double pistons 1, 3 during the switching process. Once the. Piston 1 releases the connection 13 which, like all other connections in the cylinder, can advantageously be slit-shaped, the compressed air flows into the associated feedback line. If for any reason the piston 2 stops, e.g. in the position shown in Fig. 3, it interrupts the feedback line itself by placing itself in front of the connections 20, 21 like a slide. As long as the connections 20, 21 are not yet covered by the piston, the feedback air blows out through the open displacement as with the connections 22, 24. The feedback device described is of simple and robust construction. It is advisable to use one and the same design of the double piston lifts for the three poles in accordance with the exemplary embodiment. The connections not used for the individual drives are closed, as mentioned at the beginning with regard to the drive shown. PATENT CLAIMS: 1. Feedback device for multi-pole disconnectors with a double piston drive per pole, at the connections for the pressure medium leading feedback channel through attached in the piston Channel sections are produced, characterized in that the feedback line from the connection to the pressure chamber (13 to 18) of a double piston system to the feedback arrangement via connections in the cylinder walls of the other double piston systems (20, 21, 26, 27 resp. 22,24,28,30) is performed, which in turn when the piston is in the feedback position by the Piston channels are switched on in the feedback path. 2. Feedback device according to claim 1, characterized in that each individual double cylinder additionally has six connections, three of which are one and the remaining three of the other End position of the double piston are assigned 3. Feedback device according to claim 1, characterized in that according to the end positions the double piston each two of the connections (14, 15 or 16, 17) at the same vertical distance are arranged side by side from the cylinder edges as feedback line connections, while the third connection (13 or 18) is located in the pressure chamber area of the piston. Considered publications:
German patent specifications No. 687 080, 676 907. 1 sheet of drawings © 909-690 / 448 12:59 DRAWINGS SHEET! ISSUE DATE: DECEMBER 24, 1959 kl. 21c 45/50 INTERNAT. KL. H 02 C The end Fig. 1 ^ Feedback 121 • -25 ζ. Feedback Fig. 909 690/448