DD251430A1 - Device for controlling the motion flow of a switching process, especially for high voltage power switches - Google Patents

Device for controlling the motion flow of a switching process, especially for high voltage power switches Download PDF

Info

Publication number
DD251430A1
DD251430A1 DD29286686A DD29286686A DD251430A1 DD 251430 A1 DD251430 A1 DD 251430A1 DD 29286686 A DD29286686 A DD 29286686A DD 29286686 A DD29286686 A DD 29286686A DD 251430 A1 DD251430 A1 DD 251430A1
Authority
DD
German Democratic Republic
Prior art keywords
voltage
electrorheological fluid
via
cylinder
characterized
Prior art date
Application number
DD29286686A
Other languages
German (de)
Inventor
Manfred Ulrich
Lutz Winkler
Original Assignee
Liebknecht Transformat
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Liebknecht Transformat filed Critical Liebknecht Transformat
Priority to DD29286686A priority Critical patent/DD251430A1/en
Publication of DD251430A1 publication Critical patent/DD251430A1/en

Links

Abstract

The invention aims to provide a device for controlling the sequence of movement of a switching operation, in particular for high-voltage circuit breaker, which allows for safe Betriebfuehrung from the drive side an extension of the Abschaltleistung-Masseverhaeltnis, the abschaltende power can be evaluated via an electronic device and the results as the switch Guide size are available, so that via a valve system of the switch drive in its speed can be acted upon so that the shutdown in each case successfully and the standing Abschaltergie available control is used. According to the invention, it is now provided that the switching rod is rigidly connected with its actuating piston via a guide rod to a blocking piston which is displaceable in a cylinder filled with an electrorheological fluid and seals the actuation cylinder, wherein the electrorheological fluid is connected to the driving system by one of the conditions of the network connected in terms of voltage, current and phase angle evaluating microcomputer system, with a the viscosity or the physical state of the electrorheological fluid changing control voltage can be acted upon. figure

Description

For this 1 page drawing

Field of application of the invention

The invention can be advantageously used for controlling a switching operation, in particular in high-voltage circuit breakers, wherein the switching operation is controlled according to a predetermined program. The program calculates the path-time characteristic of the switch from the current and voltage values to be switched and accordingly controls the switch drive according to the calculated characteristic values.

Characteristic of the known technical solutions

Switchgear for the distribution of electric energy in industry and public networks is u.a. demanded that in addition to a high supply reliability and safe operation management is ensured by them. Safe operation management requires that the switch always switch off the power to be switched safely. The high-voltage circuit breakers switch off the current after a constant characteristic curve, regardless of whether it is a short-circuit current, rated current or an empty circuit. The path-time characteristic is changed only by the opposing force generated by the arc, resulting in the demand that the drive always has to apply the maximum force so that the elimination succeeds safely.

For switches with a small stroke and small switching capacity currently used known switch actuators meet the requirements. However, if the switching currents are higher and the contact points are larger, higher demands are placed on the switch drive. Thus, when switching off for the moving contacts to provide an initial speed whose size goes in the direction of infinity, at the extinguishing time for the arc at Korn pressionsschaitern an additional load occurs and at the end of the shift a negative acceleration is applied. When using the known controllers of the relay technology, the switching actuators must fulfill the aforementioned requirements uncontrolled or partially mechanically controlled, d. H. Each energy reserve is used up at every switching operation, which limits the power output of the drive side to ever-higher breaking capacities, in relation to the international requirements for increasing the breaking capacity-mass ratio.

The aim of the invention is to provide a device for controlling the movement sequence of a switching operation, in particular for high-voltage circuit breaker, which makes it possible to extend the hitherto existing limits in terms of Abschaltleistung-mass ratio for safe operation of the switch from the drive side for higher Abschaltleistungen.

Explanation of the essence of the invention

The invention has for its object to provide a means for controlling the movement of a switching operation, in particular for high-voltage circuit breaker, in which the power to be disconnected evaluated by an electronic device and the result is provided to the switch as a reference variable, so that a valve system of the Switch drive in its speed can be acted upon so that the shutdown is successful in any case and the available shutdown energy is used controlled.

According to the invention, this object is achieved in that the switching rod is rigidly connected with its actuating piston via a guide rod with a displaced in a filled with an electrorheological fluid seals over the cylinder actuated cylinders blocking piston, wherein the electrorheological fluid via a drive means which with a the Connected to conditions of the network with respect to voltage, current and phase angle evaluating microcomputer system, with a viscosity or the physical state of the electrorheological fluid changing control voltage can be acted upon.

When using an electrorheological fluid, which according to the invention is in direct operative connection with the drive, the effect is exploited that the drive speed of the drive can be influenced controlled by the application of a control voltage to the electrorheological fluid depending on the voltage level. It is well known that upon application of a voltage of the order of 2 to 6 kV / mm and a current of 2 mA, the electrorheological fluid cures within a few milliseconds without temperature change to a solid concrete-like mass. The cured electrorheological fluid can withstand shear, tensile and compressive stresses. The transformation from the state of matter liquid to solid is reversible and can be slow or fast depending on the voltage gradient, whereby it is also possible to change only the viscosity of the electrorheological fluid by applying a certain control voltage.

The invention makes it possible for the microcomputer system in real-time operation to enable an acceleration of the speed of the shift rod or a delay thereof through the network parameters. In the case of persistent short-circuit current cut-offs, the speed of the drive piston is increased to theoretically infinite in the current zero crossing and decelerated after successful shutdown of the drive piston. The parameters of the control voltages for changing the viscosity of the electrorheological fluid, which are different for the switching operation, are constantly provided by the microcomputer system in the context of the invention. As already indicated above, the device according to the invention is operated at high voltage potential, whereby advantageously the signals from the microcomputer system are transformed to high voltage potential via optical fibers and the control voltage is obtained from the high voltage part of the control device.

In a further concrete embodiment of the invention, a sieve-shaped nozzle arrangement is provided in the cylinder containing the electrorheological fluid, to which the control voltage can be applied. In addition, however, it is also possible that the blocking piston is formed Siebbodenförmig and can be acted upon by the control voltage. It is also expedient that capacitors are provided in the high voltage part of the drive means, which are constantly charged to high voltages. Conveniently, the control device is electromagnetically operated or with thyristors or transistors.

Characterized in that the high-voltage circuit breaker is not claimed in use of the device according to the invention at every switching operation to its power limit, its life can be significantly increased. Since now at the beginning of the Ausschaltvorganges very fast movements towards the end of the switching out according to the invention slow down well, high turn-off are possible because the Abschaltleistung mass ratio can be significantly increased.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. The accompanying drawing shows a schematic representation of a drive of a high-voltage circuit breaker in section, with an on and off operation via compressed air.

In the switch drive shown in the drawing, the shift rod 1 is connected with its actuating piston 2 via a guide rod 3 rigidly connected to a blocking piston 4, which is displaceable in a filled with an electrorheological fluid 5 cylinder 6, which in turn is connected to a surge tank 7, wherein seals 9 are provided in the region of the passage of the guide rod 3 from the actuating cylinder 8 into the cylinder 6, which on the one hand prevent the escape of compressed air from the actuating cylinder 8 and on the other the escape of electrorheological fluid 5 from the cylinder 6.

About a microcomputer system 10, the switching operation is evaluated by the conditions of the network in terms of voltage, current and phase angle and forwarded to a control device 11 which acts on a arranged in the cylinder 6 sieve nozzle arrangement 12 with a certain voltage level. The electrorheological fluid changes its viscosity according to the voltage level, d. H. the sequence of movements of the switching process is decelerated when a voltage increase or accelerated at a voltage reduction. If only a rough control of the switching operation can be achieved, then the nozzle assembly 12 could be omitted. Since the electrorheological fluid 5 is transformed into a pulpy mass at a relatively low voltage, a continuous control can be effected by the nozzle arrangement 12.

In the high voltage part 13 of the control device 11, the capacitors Ci to C 5 are constantly maintained at different voltages Ui to Ug, so that according to the required viscosity of the electrorheological fluid of the corresponding capacitor can be controlled.

Claims (5)

1. A device for controlling the sequence of movements of a switching operation, in particular for high-voltage circuit breakers, characterized in that the switching rod (1) with its actuating piston (2) via a guide rod (3) rigid with a filled with an electrorheological fluid (5) via seals (9) from the actuating cylinder (8) separate cylinder (6) slidable blocking piston (4) is connected, wherein the electrorheological fluid (5) via a drive means (11), which with the conditions of the network with respect to voltage, current and phase angle evaluating microcomputer system (10), with a viscosity or the state of aggregation of the electrorheological fluid (5) changing control voltage can be acted upon.
2. Device according to item 1, characterized in that in which the electrorheological fluid (5) containing cylinder (6) eineiebbodenförmige nozzle arrangement (12) is provided, on which the control voltage can be applied.
3. Device according to item 2, characterized in that the blocking piston (4) in the cylinder (6) is formed Siebbodenförmig and can be acted upon with a control voltage.
4. Device according to item 1 to 3, characterized in that in the high voltage part (13) of the drive means (11) capacitors (Ci to C 4 ) are provided, which are constantly charged to high voltages (U 1 to U 5 ).
5. Device according to item 1 or 4, characterized in that the control device (11) is operated electromagnetically or with thyristors or transistors.
DD29286686A 1986-07-25 1986-07-25 Device for controlling the motion flow of a switching process, especially for high voltage power switches DD251430A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DD29286686A DD251430A1 (en) 1986-07-25 1986-07-25 Device for controlling the motion flow of a switching process, especially for high voltage power switches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD29286686A DD251430A1 (en) 1986-07-25 1986-07-25 Device for controlling the motion flow of a switching process, especially for high voltage power switches

Publications (1)

Publication Number Publication Date
DD251430A1 true DD251430A1 (en) 1987-11-11

Family

ID=5581196

Family Applications (1)

Application Number Title Priority Date Filing Date
DD29286686A DD251430A1 (en) 1986-07-25 1986-07-25 Device for controlling the motion flow of a switching process, especially for high voltage power switches

Country Status (1)

Country Link
DD (1) DD251430A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9775657B2 (en) 2011-09-30 2017-10-03 Acute Innovations Llc Bone fixation system with opposed mounting portions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9808297B2 (en) 2008-10-10 2017-11-07 Acute Innovations Llc Bone fixation system with opposed mounting portions
US9775657B2 (en) 2011-09-30 2017-10-03 Acute Innovations Llc Bone fixation system with opposed mounting portions

Similar Documents

Publication Publication Date Title
US7508636B2 (en) Hybrid circuit breaker device
US8138440B2 (en) Medium-voltage circuit-breaker
JP3179349B2 (en) Opening and closing device
US20010002664A1 (en) Hybrid circuit breaker
US3348001A (en) Electric distribution system
US4434332A (en) Hybrid-type interrupting apparatus
CA1289995C (en) Electrical switching equipment for high breaking voltages
SU1729304A3 (en) Air-pressure switch
US6437274B2 (en) Hybrid circuit breaker
WO1999060591A1 (en) Actuation and control device for electric switchgear
EP1939909A2 (en) Circuit breaker and opening and closing method thereof
DE19613568A1 (en) breakers
DE19613569A1 (en) breakers
US20140376140A1 (en) Hybrid dc breaker
EP2469552A2 (en) Method, circuit breaker and switching unit for switching off high-voltage DC currents
US4321435A (en) Fluid actuating device for an electric circuit breaker
EP0830699B1 (en) Control method and device for a switchgear actuator
US4099039A (en) Means for effectively controlling the forces imposed on the movable contact of a vacuum-type circuit interrupter
CN1179387C (en) Gas insulated switch
US9640973B2 (en) Hybrid high-voltage DC breaker
EP2270827A1 (en) Vacuum circuit breaker
US5296662A (en) Electric switching device
CN103021739B (en) Hybrid DC breaker
US3548256A (en) High voltage d-c circuit breaker
KR100587575B1 (en) Vacuum switching device and method thereof

Legal Events

Date Code Title Description
ENJ Ceased due to non-payment of renewal fee