EP2591483B1 - Selector switch mechanism with compensation for position of the cam slot - Google Patents

Selector switch mechanism with compensation for position of the cam slot Download PDF

Info

Publication number
EP2591483B1
EP2591483B1 EP10729875.4A EP10729875A EP2591483B1 EP 2591483 B1 EP2591483 B1 EP 2591483B1 EP 10729875 A EP10729875 A EP 10729875A EP 2591483 B1 EP2591483 B1 EP 2591483B1
Authority
EP
European Patent Office
Prior art keywords
shaft
tap changer
reference guide
cam ring
cylinder
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.)
Not-in-force
Application number
EP10729875.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2591483A1 (en
Inventor
Petter Nilsson
Lars Jonsson
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 Research Ltd Switzerland
ABB Research Ltd Sweden
Original Assignee
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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 ABB Research Ltd Switzerland, ABB Research Ltd Sweden filed Critical ABB Research Ltd Switzerland
Publication of EP2591483A1 publication Critical patent/EP2591483A1/en
Application granted granted Critical
Publication of EP2591483B1 publication Critical patent/EP2591483B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0038—Tap change devices making use of vacuum switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/42—Driving mechanisms, i.e. for transmitting driving force to the contacts using cam or eccentric
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0016—Contact arrangements for tap changers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0027—Operating mechanisms
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H2033/6667—Details concerning lever type driving rod arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2223/00—Casings
    • H01H2223/044—Protecting cover

Definitions

  • the present invention relates generally to tap changers for transformers, and in particular to a selector switch mechanism with compensation for the position of a cam slot in a tap changer of a transformer.
  • on-load tap changers In power transformers, on-load tap changers (OLTC) are used to change tapping connections of transformer windings while the transformer is energised. To satisfy the needs of increased service life and reduced maintenance of on-load tap changers, tap changers of newer type often uses vacuum interrupters to quench the arc instead of in oil as in traditional tap changers.
  • the rotating mechanism can be provided with one or several cam followers following cam slots or grooves provided with cams located on the inside of a cylinder.
  • cam slots and cam followers are used in many cases.
  • the mechanism to be activated by the cam movement might be unintentionally affected by irregularities in the position of the cam slot. Even small irregularities might affect the vacuum interrupters since they are operated with very small movements, often only a few mm.
  • a cam slot position diverging from its original position with 1 mm thus can cause not wanted affection of the interrupter mechanism.
  • the selector switch is developed for tapped transformers to enable continuous tap switching with respect to a tapped winding, whereby fixed stepped contacts are arranged inside a cylinder made of insulating material on a horizontal plane for each phase.
  • a rotating actuating or switching shaft is located inside the insulating cylinder.
  • the actuating shaft has a moveable hinged contact carrier for each phase that is to be switched and vacuum switching cells are respectively and vertically arranged on said contact carrier.
  • D1 illustrates (see figure 1 , and page 5, line 16 - page 6 line 14) a cylindrical tap changer with a switching shaft (2) that carries a contact support (3) mounted on a pivot block (4) on the shaft.
  • Two vacuum interrupters or switches (27, 29) (claim 1) are mounted vertically (upright) on the contact support (3) and their actuating rods (stems 35, 36) extend vertically (axially).
  • the actuating rods (35, 36) of the vacuum switches (27 and 28) there are two levers (37, 38) that each have a free end carrying a respective roller bolt (41, 42) with a respective control roller (39, 40). Both levers (37, 38) are pivotal on respective pivots (43, 44).
  • control rollers (39, 40) of the levers (37, 38) themselves ride on a control ring or cam ring (45) provided with cams.
  • the two control surfaces (46, 47) serve to actuate the vacuum switches (27, 28) in that as the respective control rollers (39, 40) ride onto a cam or bump the respective levers (37, 38) will pivot about their pivots (43, 44) and thus operate the actuating rod (35 or 36) of the respective vacuum switch (27 or 28).
  • the contact support (3) in D1 can handle and compensate for the problem with irregularities in the position of the cam slot, as described above (see D1 page 9, line 9-18), since the contact support (3) has two guide rollers (55, 56) that roll on opposite faces of the output contact ring (48) and thus guide the entire contact support (3).
  • the contact supports (3) is pivotal on the switching shaft (2) and are guided by the ring (48) so that there is a proper control of the rollers (39, 40) and thus actuation of the vacuum switches (27, 28).
  • a problem with having the entire contact support pivotally arranged and guided is that also the vertically arranged vacuum switches are carried and also pivotally mounted to the shaft.
  • the cuffs (33, 34 in D1) of the vacuum interrupters are filled with oil, and there is a risk that air might be trapped if the vacuum interrupters are not vertically arranged during the filling process.
  • pivotal arrangement of the vacuum interrupters makes the manufacturing of the tap changer more difficult and also risks deteriorating the function of the vacuum interrupters.
  • the tap changer comprises a cylinder and a vertical switching shaft inside the cylinder, wherein contacts carried by the shaft engage and disengage corresponding contacts on the inside of the cylinder, and comprising axially arranged vacuum interrupters actuated by a respective actuating lever following a ring structure with cams arranged on the inside of the cylinder.
  • the tap changer also includes at least one guide that follows the ring structure, each actuating lever being pivotally connected to the guide.
  • the tap changer is characterised in that the guide is pivotally arranged in relation to the vacuum switches, and the vacuum switches is fixedly secured to the switching shaft.
  • the invention provides a tap changer arrangement, which tap changer comprises a vertically arranged insulated cylinder having contact elements projecting inwards, a switching shaft extending in the axial direction of the cylinder, and being rotatably arranged in the cylinder and a contact carrying structure attached to the shaft, and rotating with the shaft and provided to effect tap changes upon rotation of the shaft inside the cylinder.
  • the tap changer also comprises vacuum interrupters arranged vertically on the contact carrying structure and the vacuum interrupters are operated by activating levers following a cam ring arranged on the inside of the cylinder.
  • the tap changer also includes a reference guide carried by the contact carrier structure, which reference guide upon rotation of the shaft, follows a reference surface of the cam ring, the activating lever being pivotally connected to the reference guide and thereby the reference guide keep the actuating lever in position in relation to the reference surface of the cam ring.
  • the tap changer and the arrangement is characterised in that the reference guide is pivotally arranged in relation to the shaft and in that each vacuum interrupter is fixedly secured to the shaft. In this way the reference guide is free to follow the cam ring up and down if the vertical position of the cam ring varies in relation to the shaft and/or contact carrier, whereas the vacuum interrupters are vertically and axially oriented and do not pivot.
  • the vacuum interrupter are arranged mechanically between the shaft and the reference guide, the vacuum interrupters are on the fixed structure of the contact carrier whereas the reference guide is arranged between a pivot on the contact carrier and the cam ring.
  • the actuating lever is preferably pivotally connected to the reference guide, having its pivot point on the guide.
  • the actuating lever is rotatably connected by means of a hinge to an actuating rod of the vacuum interrupter, the actuating rod extending in the axial direction of the vacuum interrupter.
  • the axial direction of the vacuum interrupter is the axial, and vertical, direction of the shaft.
  • the reference guide is pivotally arranged and has a pivot axis in the same direction as the axis of the hinge connection between the actuating lever and the actuating rod.
  • the pivot axis of the reference guide and the axis of hinge between actuating lever and actuating rod are the same axis of rotation, i.e. they share rotation axis.
  • the reference guide is provided with two guide rollers for running against the reference surface of the cam ring.
  • the actuating lever is provided with a roller for running against the cam ring, and the roller follows the cams of the ring.
  • lever arm provided with a second cam follower arranged to follow a second cam slot arranged on the inside surface of said cylinder.
  • Figure 1 illustrates a contact arrangement inside a cylindrical tap changer, which contact arrangement is provided in accordance with the invention.
  • Figure 1 is a side view of a vertically arranged cylindrical tap changer.
  • FIG 1 illustrates a cylindrical tap changer comprising a cylinder 2 and a rotatable switching shaft 3 arranged inside the cylinder, in the centre of the cylinder 2.
  • the cylinder 2 is provided with tap contacts 12 extending into the cylinder.
  • These tap contacts 12 are adapted to mate with interior contacts 22 for providing a tap change.
  • the interior tap contacts 22 are secured to the shaft so that they rotate with the shaft. To provide good electrical connection the interior contacts 22 are spring loaded.
  • the arrangement also includes vacuum interrupters, one is illustrated 5, and a mechanism for operating the vacuum interrupter.
  • the mechanism and the vacuum interrupter are fastened to the shaft and rotate with the shaft.
  • the mechanism includes an actuating lever 6 pivotally arranged on a pivot 9. One end of the lever 6 is provided with a cam follower 16 and is arranged to run in a cam ring 7 arranged inside the cylinder. The other end of the actuating lever is connected by a hinge 10 to an actuating rod 13 of the vacuum interrupter 5.
  • the tap changer When the tap changer is operated during a tap change the lever 6 rotates with the shaft around the shaft axis, and the cam follower 16 follows the cam ring 7, and upon meeting a cam (not illustrated in figure 1 , see figure 4 ) the actuating lever 6 pivot around pivot 9 and lifts the actuating rod 13 up (vertically), and actuates the vacuum interrupter 5.
  • the pivot 9 of the actuating lever 6 is arranged on a reference guide 8.
  • the reference guide 8 is, in one end, connected via a horizontal pivot 11 to the switching shaft 3 and it rotates with the shaft 3.
  • the reference guide 8 is in its other end arranged to follow, a reference surface 17 of, the cam ring 7, and for this purpose this other end includes a ring follower provided with rollers 18a, 18b.
  • the reference guide 8 is arranged to rotate together with the switching shaft, and if the altitude of the contact arrangement varies with the altitude of the cam ring 7, the reference guide 8 is free to follow the cam ring 7, up and down, by rotating slightly around its pivot 11 of the arrangement.
  • the pivot 11 is arranged so that the reference guide can rotate in relation to the vacuum interrupter 5, since the vacuum interrupter are fixed to the shaft and do not rotate around in relation to the switching shaft 3 (and also not around the pivot of the reference guide 8).
  • the pivot 11 of the reference guide is arranged between the vacuum interrupter 5 and the cam ring 7, so that the vacuum interrupter 5 does not follow the variations of the cam ring 7 in the vertical direction, whereas the reference guide 8 follows the vertical variations of, the reference surface 17 of, the cam ring 7.
  • the pivot 9 of the actuating lever 6 moves with the reference guide 8, so that the pivot 9 also follows the reference surfaces of the cam ring 7.
  • the function of the actuating lever 6 is not affected by height variations between the shaft 3 and the cam ring 7, such variations are compensated for by the reference guide 8 that carries the pivot 9 of the actuating lever 6.
  • the actuating lever 6 is operatively connected to the actuating rod 13 of the vacuum interrupter 5 by means of a hinge, so that the pivotal actuating movement of the actuating lever 6 is transformed into an essentially vertical actuating movement of the rod 13 inside the vacuum interrupter 5.
  • the hinge allows a rotation of the lever in the horizontal plane, around an axis 10 that is parallel with the pivot axis 9.
  • the pivot 11 of the reference guide 8 is arranged in the same axis 10, 11 as the hinge 10, so that the reference guide rotate around the hinge axis 10 of the lever 6 and rod 13 connection.
  • This axis lies at an altitude or vertically between, preferably in the middle between, the contact surface of the actuator 6 and cam ring 7 and the contact surfaces 17 of the reference guide and the cam ring 7.
  • the interior contacts 22 are preferably fixed to the reference guide 8, as illustrated in the figure, so that these contacts follow the cam ring 7 reference surfaces 17 in the vertical direction.
  • the axes of rotation for the lever pivot 9, lever hinge 10 and guide pivot 11 are located at a respective radial distance from the shaft 3 and each of these axes extend in a circumferential direction.
  • Figure 2 illustrates a contact arrangement in accordance with the invention from above. It more clearly illustrates the pivot 11 of the reference guide 8 and the hinge 10 of the connection between the actuating lever 6 and the actuating rod 13 of the vacuum interrupter 5. As can be seen the hinge 10 and pivot 11 have a common axis of rotation (illustrated by the line through hinge 10 and pivot 11).
  • Figure 2 illustrates the contact arrangement between the inner surface of the insulated cylinder 2, which is provided with the cam ring 7, and the switching shaft (not illustrated). It shows an arrangement of two vertical vacuum interrupters 5, each of which is provided with an actuating rod below the joint 10 connecting each rod to a corresponding actuating lever 6, at the innermost end of the actuating lever 6.
  • the actuating lever 6 is arranged in a groove provided with cams in the cam ring 7. Each actuating lever 6 is rotatable around its respective pivot 9, where it is connected to the reference guide 8.
  • the reference guide 8 is pivotally arranged by a pivot 11, for example by means of a bearing on a shaft, to the contact arrangement so that it can rotate relative the vacuum interrupters 5.
  • the guide 8 provides a foundation for the pivot 9 of the actuation lever 6, which foundation automatically adjusts to height variations between the cam ring 7 and the vacuum interrupters 5, and thereby also the switching shaft 2.
  • FIG. 3 illustrates the arrangement of the vacuum interrupter 5 on the contact carrier in accordance with the invention in a simplified view in perspective.
  • the view illustrates the pivot 10 of the reference guide and its cam following rollers 18 running on the reference surfaces 17 thereby following the cam ring, so that the vertical position of the pivot 9 for the actuating lever 6 follows the cam ring.
  • the hinge 10 of the actuating lever 6 is not affected by a possible vertical variation of the cam ring 7, so the actuating lever 6 will only operate the vacuum interrupter 5, i.e. only lift the actuating rod of the vacuum interrupter, when the cam follower 16 meets and interacts with a cam in the cam groove of the cam ring 7.
  • Figure 4 illustrates an example of a cam ring 7 of the invention, which is arranged on the interior surface of the insulated cylinder of the tap changer (which cylinder 2 meets the outer surface of the cam ring).
  • the cam ring 7 is provided with two grooves provided with cams 9, for actuating a respective vacuum interrupter (corresponding to the two interrupters 5 of figure 2 ) via a respective actuating lever (6 of figures 1-3 ) running in the cam groove, or cam race.
  • the cam grooves 9, are provided in the cam rings 7 and extend annularly in relation to the cylinder.
  • the cam ring 7 is also provided with a reference surface 17 provided as a rail for the reference guide, a rail having no cams.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Switches With Compound Operations (AREA)
EP10729875.4A 2010-07-06 2010-07-06 Selector switch mechanism with compensation for position of the cam slot Not-in-force EP2591483B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/059676 WO2012003863A1 (en) 2010-07-06 2010-07-06 Selector switch mechanism with compensation for position of the cam slot

Publications (2)

Publication Number Publication Date
EP2591483A1 EP2591483A1 (en) 2013-05-15
EP2591483B1 true EP2591483B1 (en) 2014-03-26

Family

ID=43654022

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10729875.4A Not-in-force EP2591483B1 (en) 2010-07-06 2010-07-06 Selector switch mechanism with compensation for position of the cam slot

Country Status (5)

Country Link
EP (1) EP2591483B1 (ko)
KR (1) KR101457822B1 (ko)
CN (2) CN102315030B (ko)
BR (1) BR112013000266A2 (ko)
WO (1) WO2012003863A1 (ko)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012101475U1 (de) * 2012-04-20 2013-07-23 Maschinenfabrik Reinhausen Gmbh Laststufenschalter
DE102013107545B4 (de) 2013-07-16 2017-02-16 Maschinenfabrik Reinhausen Gmbh Lastwähler
DE102013107554B4 (de) * 2013-07-16 2016-05-19 Maschinenfabrik Reinhausen Gmbh Lastwähler
DE102013107550B4 (de) 2013-07-16 2017-05-04 Maschinenfabrik Reinhausen Gmbh Lastwähler
DE102014112764A1 (de) * 2014-09-04 2016-03-10 Maschinenfabrik Reinhausen Gmbh Schaltanordnung für einen Regeltransformator, insbesondere Polungsschalter
DE102014112763A1 (de) * 2014-09-04 2016-03-10 Maschinenfabrik Reinhausen Gmbh Schaltanordnung für einen Regeltransformator, insbesondere Vorwähler
JP2019212821A (ja) * 2018-06-06 2019-12-12 株式会社ダイヘン トルク調節装置及びタップ切換装置
DE102018130869A1 (de) * 2018-12-04 2020-06-04 Maschinenfabrik Reinhausen Gmbh Lastumschalter für Laststufenschalter und Laststufenschalter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4231353C2 (de) * 1991-09-19 1997-07-24 Toshiba Kawasaki Kk Stufenschalter
JP3387285B2 (ja) * 1995-08-29 2003-03-17 株式会社日立製作所 真空スイッチ式負荷時タップ切換器
DE19821775C1 (de) * 1998-05-14 1999-10-14 Reinhausen Maschf Scheubeck Lastwähler

Also Published As

Publication number Publication date
EP2591483A1 (en) 2013-05-15
KR101457822B1 (ko) 2014-11-04
CN102315030A (zh) 2012-01-11
CN102315030B (zh) 2015-03-04
CN202352548U (zh) 2012-07-25
KR20130036120A (ko) 2013-04-10
BR112013000266A2 (pt) 2017-11-07
WO2012003863A1 (en) 2012-01-12

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