EP0668600B1 - Operating device for circuit breakers - Google Patents

Operating device for circuit breakers Download PDF

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Publication number
EP0668600B1
EP0668600B1 EP19950102239 EP95102239A EP0668600B1 EP 0668600 B1 EP0668600 B1 EP 0668600B1 EP 19950102239 EP19950102239 EP 19950102239 EP 95102239 A EP95102239 A EP 95102239A EP 0668600 B1 EP0668600 B1 EP 0668600B1
Authority
EP
European Patent Office
Prior art keywords
operating
catch flap
operating lever
edge portion
operating device
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.)
Expired - Lifetime
Application number
EP19950102239
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0668600A1 (en
Inventor
Per LINDSTRÖM
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.)
ABB AB
Original Assignee
Asea Brown Boveri AB
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 Asea Brown Boveri AB filed Critical Asea Brown Boveri AB
Publication of EP0668600A1 publication Critical patent/EP0668600A1/en
Application granted granted Critical
Publication of EP0668600B1 publication Critical patent/EP0668600B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H01H3/3031—Means for locking the spring in a charged state

Definitions

  • the present invention relates to an operating device, intended for electric circuit breakers, of the kind described in the preamble to claim 1.
  • the operating device is primarily intended for SF 6 breakers for outdoor substations with a rated voltage of the order of magnitude of 40 kV and higher, but the operating device may advantageously be used also for other types of circuit breakers.
  • the operating device comprises closing springs, which in tensioned condition contain the necessary energy for closing of the breaker and for charging of the opening springs of the breaker.
  • a spring-actuated operating device of the above-mentioned kind is previously known from DE-C-1948405.
  • the known operating device comprises, inter alia, an operating shaft for closing the circuit breaker, closing springs for rotating the operating shaft, a tensioning device with a driving shaft for charging the closing springs via an endless chain, and latching devices for limiting the rotation of the operating shaft upon each closing and for latching the operating shaft during the charging of the closing springs.
  • a problem with spring-actuated operating devices of this kind is to master the energy stored in the springs, which energy is to be released rapidly to operate the circuit breaker. It is then important for the parts included to be easily movable, to have a small mass inertia, and to be designed to withstand the very great forces developed by the springs.
  • the invention aims to provide an operating device of the above-mentioned kind which, in comparison with corresponding prior art designs, provides faster operation, has smaller dimensions and is so designed that its manufacturing cost is lower.
  • the invention suggests an operating device for circuit breakers according to the introductory part of claim 1, which is characterized by the features of the characterizing part of claim 1.
  • the operating lever of the operating device is provided with a spring-loaded catch flap which cooperates with the fixedly mounted tripping latch.
  • a latching arm fixed on the operating shaft is provided with a similar catch flap, which cooperates with the fixedly mounted closing latch. Since the catch flap is in the shape of a substantially rectangular plate, one edge portion of which is designed to serve as a rotary shaft and rotatably fixed in a bearing seat formed in the operating lever and in the latching arm, respectively, many advantages are obtained, of which the following may be mentioned:
  • the operating device shown in the drawings is intended for high-voltage circuit breakers of, for example, the kind described in Asea Journal 1983, No. 3, pp. 16-21.
  • the different parts of the operating device, with the exception of the opening springs of the circuit breaker, are enclosed in a cabinet 10.
  • the operating device has an operating shaft 11, on which is mounted a cam disk 12 which, via an operating lever 13 and an operating rod 14, influences the movable contact 15 (schematically shown in Figs. 1-4) of the circuit breaker. Closing of the circuit breaker is performed by turning the operating shaft 11 in a clockwise direction (Fig.
  • the task of the stretching chain 24 is to keep the endless chain 20 stretched.
  • a closing latch 26 (Figs. 4 and 7) is arranged near the operating shaft 11, such that the shaft can only rotate one revolution upon each closing operating. Further, a tripping latch 27 is arranged near the operating lever 13 to keep the movable contact of the circuit breaker in the closed position after a closing operation.
  • Figure 1 shows the operating device in its normal operating position, wherein the contact 15 of the circuit breaker is in the closed position and the closing springs 16 and the opening spring 28, which is placed adjacent the linkage system of the circuit breaker, are tensioned.
  • the circuit breaker is retained in the closed position by the tripping latch 27 which takes up the force from the tensioned opening spring 28. If the circuit breaker now receives a tripping impulse, the operating device can open the circuit breaker and is able to carry out a complete rapid auto-reclosing whereby, following its opening, the breaker closes automatically after a predetermined time interval of 0.3s and, if the fault remains, opens again immediately.
  • the tripping latch 27 Upon opening of the circuit breaker (Fig. 2), the tripping latch 27 is released by its magnet.
  • the opening spring 28 carries out the operation, whereby the circuit breaker opens.
  • the operating lever 13 moves to the left and is positioned with its stop roller 29 against the cam disk 12. The movement of the contact system is damped in the end position by a damping device 30.
  • the closing latch 26 Upon closing of the circuit breaker (Fig. 3), the closing latch 26 is released by its magnet. The driven chain wheel 19 is blocked against rotation, the energy in the closing springs 16 thus being transferred via the chain section 20a to the chain wheel 22 with the associated cam disk 12. This causes the cam disk to drive the operating lever 13 to the right where it is blocked in the end position by the tripping latch 27. The velocity of movement is slowed down in the end position by a damping device 31, and the latching arm 32 fixed on the operating shaft 11 again reaches its initial position towards the closing latch 26.
  • FIGS 5 and 6 show the latching member which is intended for cooperation with the closing latch and which comprises the latching arm 32, capable of being fixed to the operating shaft 11, and a catch flap 40 supported by the latching arm.
  • This catch flap has the shape of a substantially rectangular plate, one edge portion 41 of which is designed to make contact with the closing latch 26, whereas the opposite edge portion 42 is designed with an arc-shaped contour to be able to serve as a rotary shaft.
  • the catch flap 40 is provided with two lugs 43 extending from the plane of the flap and provided with oblong through-holes 44.
  • the catch flap 40 is mounted in the latching arm 32 by pushing the edge portion 42 of the catch flap sideways into a slot 33 in the latching arm adapted to the edge portion.
  • the slot 33 has a longitudinal opening 34, the width of which is larger than the thickness of that portion of the catch flap which is located nearest the edge portion 42 but smaller than the transverse dimension of the edge portion. In this way, the catch flap is fixed in the longitudinal direction.
  • the fixing of the catch flap in the lateral direction is achieved with the aid of a resilient tubular pin 35 which is fixed in the hole 36 in the latching arm 32, thus engaging into a transversal slot 45 provided in the edge portion 42 of the catch flap, the slot having such a depth that the rotary motion of the catch flap is not prevented by the pin 35.
  • two (or more) compression springs 37 are arranged. With the aid of two locking pins 39, fixed into holes 38 in the latching arm 32 and engaging into the oblong holes 44 of the guiding lugs 43, the angle of rotation of the catch flap 40 is limited.
  • FIG. 7 shows the operating shaft 11 with the catch flap 40 mounted on the latching arm 32 in engagement with the closing latch 26.
  • This latch comprises two cascade-connected, spring-actuated roll latches, which may be released by means of a release magnet 46.
  • the contact points of the latches are marked by circles 48, 49.
  • the tripping latch 27 and the catch flap mounted on the operating lever 13 are of the same design as those shown in Figures 5-7.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
EP19950102239 1994-02-21 1995-02-18 Operating device for circuit breakers Expired - Lifetime EP0668600B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9400580A SE505582C2 (sv) 1994-02-21 1994-02-21 Manöverdon för strömbrytare
SE9400580 1994-02-21

Publications (2)

Publication Number Publication Date
EP0668600A1 EP0668600A1 (en) 1995-08-23
EP0668600B1 true EP0668600B1 (en) 1998-01-28

Family

ID=20393014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950102239 Expired - Lifetime EP0668600B1 (en) 1994-02-21 1995-02-18 Operating device for circuit breakers

Country Status (3)

Country Link
EP (1) EP0668600B1 (sv)
DE (1) DE69501504T2 (sv)
SE (1) SE505582C2 (sv)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015219041B4 (de) * 2015-10-01 2018-10-18 Siemens Aktiengesellschaft Doppelrollensperre für einen Auslösemechanismus für ein Schaltgerät

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE332451B (sv) * 1968-10-01 1971-02-08 Asea Ab

Also Published As

Publication number Publication date
DE69501504D1 (de) 1998-03-05
SE9400580D0 (sv) 1994-02-21
DE69501504T2 (de) 1998-09-10
EP0668600A1 (en) 1995-08-23
SE9400580L (sv) 1995-08-22
SE505582C2 (sv) 1997-09-15

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