DE29614893U1 - High voltage switch - Google Patents

Description

High voltage switch description

The invention relates to a high-voltage switch with a hydraulic spring-loaded drive, with a spring arrangement serving as an energy store, with which hydraulic pressure is generated, with which the drive piston of the hydraulic spring-loaded drive can be actuated and controlled, and with a piston rod connected to the drive piston, which is connected to the at least one switching contact piece or a pole of the high-voltage switch.

Such a high-voltage switch with a corresponding hydraulic drive is known per se (see EP 0 158 054). Two switching elements are provided to indicate the switch position, with which the piston rod is coupled in such a way that the start and end of the movement of the piston rod can be determined by operating the switches. In addition, further switching elements are assigned to the drive, which detect the movement of the spring accumulator. For this purpose, a curved piece is assigned to the spring accumulator, which can be moved with the spring accumulator and which is picked up by the switching elements.

The wiring effort this entails is considerable.

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The object of the invention is to create a high-voltage switch of the type mentioned at the outset, in which the wiring effort is considerably reduced.

This object is achieved according to the invention in that the linear movement of the movable end of the spring arrangement can be detected by means of an inductive rotary encoder and the end positions of the drive piston can be detected by means of a proximity switch, and that the signals of the rotary encoder and those of the proximity switches can be fed to an evaluation unit.

An inductive or optical encoder can be used as the rotary encoder; an inductive one is preferred. Such an inductive rotary encoder is known per se. It is able to detect the rotary positions of its shaft and convert them into signals, which can then be further processed in an evaluation device. The proximity switches can also be inductive or optical proximity switches. Here, too, inductive ones are preferred.

An advantageous embodiment of the invention can be such that a movable rack section is coupled to the movable end of the spring arrangement, with which a pinion gear meshes, which is connected to the axis of the rotary encoder.

When the sliding part of the piston rod approaches the start or end area during a switching operation, the corresponding proximity switch is activated so that the start and end of the piston rod movement and thus the switching position of the high-voltage switch can be detected immediately.

The invention and further advantageous embodiments and improvements of the invention will be explained and described in more detail with reference to the drawing, in which an embodiment of the invention is shown.

Show it:

Fig. 1 is a plan view of an arrangement according to the invention, and

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Fig. 2 is a side view of a spring-loaded actuator coupled to the

rotary encoder.

A high-voltage circuit breaker 10 of a high-voltage system, which is only shown symbolically in the figure and can be single-pole or multi-pole, is coupled via an action line 11 by means of a joint 12 to the piston rod 13 of a drive piston 14, which is guided back and forth in a cylinder arrangement 15. A sliding piece 16 is attached to the piston rod 13 in the area of the joint 12, which is also guided linearly on a guide rod 17 running parallel to the piston rod 13. An extension 18 is arranged on the sliding piece 16, which in the version according to Fig. 1 is opposite a first proximity switch 19, the output signal of which is fed to an evaluation unit 21 via a conductor 20; in the position shown, the switch 10 is in the switched-on position.

If the space of the cylinder 15, which is located on the larger piston side, is relieved by a hydraulic device (not shown in detail), the piston rod moves in the direction of arrow A, opening the switch 10. The sliding piece 16 also slides in the direction of arrow A, so that the extension 18 approaches a second proximity switch 22, which then emits a signal when the switch is in the off position. This signal is also fed to the evaluation unit 21 via a line 23.

A holder 25 is attached to a housing 24 in which the piston-cylinder arrangement 14, 15 with the piston rod 13 is housed, on which a support wall 26 is attached, to which a rotary encoder 27 is attached, the shaft 28 of which runs parallel to the piston rod 23. A pinion 29 is attached to the free end of the shaft 28. A sliding shaft 30 is fixed between the legs 25a and 25b of the holder 25, which is shown in dashed lines in Fig. 1. A sliding plate 31 slides on this sliding shaft 30 transversely to the movement of the piston rod 13, on the side of which facing the pinion 29 a rack section 32 is attached, which meshes with the pinion 29 and runs transversely to the piston rod movement. To the right of the housing 24 there is a spring arrangement 33, which is supported at its end facing away from the housing 24 on a stationary support plate 34, whereas the end facing the housing 24

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End of the spring arrangement has a pressure plate 35 which is movable relative to the plate 34 in the double arrow direction P, transverse to the piston rod movement, in such a way that the spring arrangement 33 is tensioned when moving to the right and the spring arrangement 33 is relaxed when moving to the left. The energy of the spring arrangement is fed to the hydraulic device with which the piston 14 is controlled in the cylinder chamber 15. In this context, reference is made to EP 0 158 054.

A transmission rod 36 is connected to the pressure plate 35, which is connected to the sliding plate 31 by a joint 37, so that when the pressure plate 35 moves in the double arrow direction P, the sliding plate 31 also moves on the sliding rod 30. The pinion 29 is driven via the rack section 32, so that the pinion 29 drives the shaft 28. The resulting signals from the rotary encoder 27 are fed to the evaluation unit 21 via a third line 38.

The spring-loaded arrangement 33 can also execute a movement that runs in the direction of the piston rod, and the encoder shaft 28 can also be oriented differently, e.g. perpendicular to the piston rod movement, and the rack section can also be oriented differently, which depends, among other things, on the space available.

Claims (4)

96/648 .:!. &Igr;!&tgr; * :..:S..S * ~::..* 28 August 1996 Protection claims 1. High-voltage switch with a hydraulic spring-loaded drive, with a spring arrangement (33) serving as an energy store, with which hydraulic pressure is generated, with which the drive piston (14) of the hydraulic spring-loaded drive can be actuated and controlled, and with a piston rod (13) connected to the drive piston (14) and connected to the at least one switching contact piece or pole of the high-voltage switch, characterized in that the linear movement of the movable end of the spring arrangement (33) can be detected by means of an inductive rotary encoder (27) and the end positions of the drive piston (14) and thus the switching on and off movement of the high-voltage switch can be detected by means of a proximity switch (19, 22) each, and that the signals of the rotary encoder (27) and those of the proximity switches (19, 22) can be fed to an evaluation unit (21). 2. High-voltage switch according to claim 1, characterized in that a rack section (32) is coupled to the movable end (35) of the spring arrangement (33), with which a pinion (29) meshes, which is connected to the shaft (28) of the rotary encoder (27). 3. High-voltage switch according to one of claims 1 and 2, characterized in that an extension (18) is attached to the piston rod (13), which cooperates with the proximity switches (19, 20). 4. High-voltage switch according to one of claims 1 to 3, characterized in that each proximity switch is an inductive or optical proximity switch and the rotary encoder is an inductive or an optical rotary encoder.