EP0053574A1 - Commande hydraulique pour disjoncteur électrique à haute-tension - Google Patents

Commande hydraulique pour disjoncteur électrique à haute-tension Download PDF

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Publication number
EP0053574A1
EP0053574A1 EP81730110A EP81730110A EP0053574A1 EP 0053574 A1 EP0053574 A1 EP 0053574A1 EP 81730110 A EP81730110 A EP 81730110A EP 81730110 A EP81730110 A EP 81730110A EP 0053574 A1 EP0053574 A1 EP 0053574A1
Authority
EP
European Patent Office
Prior art keywords
piston
pressure
freewheel
cylinder
hydraulic actuating
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP81730110A
Other languages
German (de)
English (en)
Inventor
Joaquin Ing. Grad. Bohrdt
Karl-Heinz Ing. grad. Hähnel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0053574A1 publication Critical patent/EP0053574A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1409—Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator

Definitions

  • the invention relates to a hydraulic actuating device for an electrical switch, in particular high-voltage circuit breaker, with a drive consisting of a differential piston and a cylinder, the differential piston being continuously loaded with the pressure of the pressure fluid on its small-area side and on its large area via a Valve device is optionally acted upon.
  • Hydraulic actuators of this type have to move the moving contacts of the circuit breakers as quickly and without delay as possible depending on the control command to switch on and off.
  • the switching time of a switching device is thus largely determined by the type of drive and its design. If you disregard the proportion of switching time determined by the arc time, the switching time is based on the start of the command, the solenoid time of the release, the valve time for the control valves, the switching rod and transmission time and the movement time of the interrupter units up to the electrical isolation.
  • the invention is based on the object of reducing the proportion of switching time caused by the movement time of the interrupter unit up to the galvanic isolation, without reducing the weight of the switching pieces and the moving masses, and without increasing the pressure of the hydraulic fluid.
  • the differential piston is designed as a two-part stepped piston system, the first part of which is a free-running piston which is limitedly movable in the cylinder and which loads the second piston part on its small-area side and has an end face which increases its effective piston area.
  • an acceleration of the differential piston corresponding to the enlarged effective piston area initially results in the course of movement, preferably during the entire phase of pre-compression of the blowing piston system.
  • the piston accelerated in this way is moved further after the limitation of the freewheel piston movement with a smaller effective piston area, so that there is a favorable energy balance in the entire movement sequence.
  • the total time between the start of the command and the galvanic isolation of the contact system can be made less than 15 msec, with the solenoid and valve time remaining the same.
  • the freewheel piston is designed as an annular piston surrounding the piston rod of the second piston part at a distance.
  • the free-running piston can be supported on the inner wall of the cylinder by means of two seals.
  • the freewheel piston encloses the second piston part in a pressure-tight manner via a seal. This results in a space-saving telescope arrangement.
  • a hydraulic actuating device for a high-voltage circuit breaker is shown schematically in a section, which is in the open position.
  • FIG. 2 shows a hydraulic drive, also shown schematically in section in the switch-off position.
  • FIG. 3 shows a further embodiment in the same position.
  • set high-voltage circuit breaker 1 determines the z. B. can be designed as a blow piston switch with sulfur hexafluoride as an extinguishing agent.
  • the switch 1 is actuated by a hydraulic actuation device 2, which has a drive consisting of a differential piston 3 and a cylinder 4. This drive can optionally be pressurized via a valve device 6.
  • the pressure fluid is removed from a reservoir 7, in which a predetermined pressure, such as 350 bar, is maintained by means of a pump (not shown).
  • the differential piston 3 is coupled to the movable contact piece of the switch 1 via a piston rod 8.
  • the differential piston 3 is designed as a two-part stepped piston system, the first part 3 a of which is a free-running piston that is limitedly movable in the cylinder 4.
  • This freewheel piston 3a loads the second piston 3b on its small-area side 9 at the beginning of the switch-off action.
  • the freewheel piston 3a has an end face 10, which increases the effective piston area of the second piston part 3b.
  • the drive shown in the switch-off position is converted into the switch-on position by reversing valve 6 in the direction of arrow 11.
  • the space 12 supplied with the pressure medium with the accumulator 7 comes into connection with the large-area side 13 of the second piston part 3b, as a result of which the piston and the piston rod 8 move in the direction of the arrow 13.
  • the small-area Seita 9 strikes the freewheel piston 3a, which is thereby carried along in the direction of the arrow 13, resulting in a braking effect. This effect is due to a reduction in the effective An drive surface (area difference of the pistons).
  • the freewheel piston also acts as a spool.
  • valve 6 reverses into the position shown in the direction of the arrow 11, so that the large-area side 13 of the piston part 3b is depressurized and the pressure present on the end face 10 and the small-area side 9 can take effect.
  • the piston rod 8 is moved in the opposite direction of the arrow 13 until the freewheel piston 3a assumes the position shown in FIG. 1.
  • the resulting reduced effective piston area 9 results in a lower force for continuing the movement of the movable system with less mass.
  • the freewheel piston 3a cooperates in FIGS. 1 and 2 with two seals 14a which delimit a ventilated space between them.
  • the freewheel piston 3a is only equipped with a seal 14a and a guide 14b.
  • the piston part 3b is provided with a seal 14 which is supported against the inner wall of the cylinder 4.
  • the pistons 3b are provided with seals 14 which run in a pressure-tight manner in the inner opening of the annular piston-like freewheel piston 3a.
  • the exemplary embodiment according to FIG. 3 differs in that a hollow cylindrical, annular freewheel piston is arranged in the cylinder 4 without a special stop shoulder. It strikes a stop with its end face.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
EP81730110A 1980-11-27 1981-10-20 Commande hydraulique pour disjoncteur électrique à haute-tension Withdrawn EP0053574A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3045041 1980-11-27
DE19803045041 DE3045041A1 (de) 1980-11-27 1980-11-27 Hydraulische betaetigungsvorrichtung fuer einen elektrischen hochspannungs-leistungsschalter

Publications (1)

Publication Number Publication Date
EP0053574A1 true EP0053574A1 (fr) 1982-06-09

Family

ID=6117899

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81730110A Withdrawn EP0053574A1 (fr) 1980-11-27 1981-10-20 Commande hydraulique pour disjoncteur électrique à haute-tension

Country Status (2)

Country Link
EP (1) EP0053574A1 (fr)
DE (1) DE3045041A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2592211A1 (fr) * 1985-12-23 1987-06-26 Bbc Brown Boveri & Cie Dispositif a piston et cylindre pour un disjoncteur a haute tension pour coupure en charge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2118863C1 (ru) * 1997-04-02 1998-09-10 Акционерное общество открытого типа "Научно-исследовательский, проектно-конструкторский институт высоковольтного аппаратостроения" Гидравлический привод высоковольтного силового выключателя

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH235369A (de) * 1943-07-12 1944-11-30 Bbc Brown Boveri & Cie Druckluftantrieb für elektrische Schalter.
US3018762A (en) * 1960-05-02 1962-01-30 Permanent Mold Die Co Inc Double piston arrangement
US3208354A (en) * 1963-02-07 1965-09-28 Parker Hannifin Corp Fluid pressure motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH235369A (de) * 1943-07-12 1944-11-30 Bbc Brown Boveri & Cie Druckluftantrieb für elektrische Schalter.
US3018762A (en) * 1960-05-02 1962-01-30 Permanent Mold Die Co Inc Double piston arrangement
US3208354A (en) * 1963-02-07 1965-09-28 Parker Hannifin Corp Fluid pressure motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2592211A1 (fr) * 1985-12-23 1987-06-26 Bbc Brown Boveri & Cie Dispositif a piston et cylindre pour un disjoncteur a haute tension pour coupure en charge

Also Published As

Publication number Publication date
DE3045041A1 (de) 1982-07-15

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19811021

AK Designated contracting states

Designated state(s): AT BE CH FR GB IT LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19820615

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HAEHNEL, KARL-HEINZ, ING. GRAD.

Inventor name: BOHRDT, JOAQUIN, ING. GRAD.