EP2637186B1 - Stufenwähler und Verfahren zur Montage eines Stufenwählers - Google Patents

Stufenwähler und Verfahren zur Montage eines Stufenwählers Download PDF

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Publication number
EP2637186B1
EP2637186B1 EP20120158342 EP12158342A EP2637186B1 EP 2637186 B1 EP2637186 B1 EP 2637186B1 EP 20120158342 EP20120158342 EP 20120158342 EP 12158342 A EP12158342 A EP 12158342A EP 2637186 B1 EP2637186 B1 EP 2637186B1
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EP
European Patent Office
Prior art keywords
tap selector
current collector
tap
inner part
collector arm
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.)
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Application number
EP20120158342
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English (en)
French (fr)
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EP2637186A1 (de
Inventor
Johan Kemppi
Alex Zhengdong Wang
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 Technology AG
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ABB Technology AG
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Publication date
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to EP20120158342 priority Critical patent/EP2637186B1/de
Priority to CN201310073174.6A priority patent/CN103311011B/zh
Publication of EP2637186A1 publication Critical patent/EP2637186A1/de
Application granted granted Critical
Publication of EP2637186B1 publication Critical patent/EP2637186B1/de
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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
    • H01H9/0016—Contact arrangements for tap changers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/06—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier

Definitions

  • the present invention in a first aspect relates to a tap selector for a tap changer, which tap selector includes a plurality of moving contacts, each moving contact being electrically connected to a respective current collector arm, each current collector arm being electrically connected to a conductor for electrical connection with a diverter switch.
  • the invention in a second aspect, relates to a method for assembling a tap selector for a tap changer, which method includes providing a rod with a plurality of fixed contacts.
  • a tap changer is commonly used in connection with a transformer in order to vary the transformation rate thereof.
  • one of the windings in the transformer has a fixed amount of turns connected to the circuit.
  • the other winding has one fixed connection point, whereas the other connection point can be selected among a number of moving contacts to attain a required voltage.
  • the selectable moving contacts may be located after each other along a portion of the winding corresponding to 70% to 100% of its full extension.
  • Tap changing includes a plurality of manoeuvres including the opening and closing of switches e.g. via a spring loaded energy accumulator and moving a fine selector arm to a new fixed contact. These manoeuvres have to be performed in a certain sequence and in a certain time relation.
  • a tap changing manoeuvre includes the change of connection from one connection point to an adjacent connection point. This is performed by a fine selector arm establishing the contact with the respective moving contact.
  • tap selectors are disclosed e.g. in US3652812 , US5374781 , EP325139 , DE3936420 , JP63148607 and CN101572174 .
  • the length required for the current collector arms might entail various problems at assembling the tap selector.
  • a tap selectors of this kind typically has an insulating cylinder enclosing the set of fixed contacts, whereby the conductor to which the current collector arms are connected is located outside this insulating cylinder.
  • the current collector arms thus have to extend through this cylinder. Due to the length of the current collector arms thereby required, it is problematic to assembly the tap selector.
  • the current collector arms attached to the moving contacts are obstacles against inserting the component on which the moving contacts are mounted into the shielding. This can be avoided by having a segment cylinder wall, but such becomes mechanically too weak for many applications.
  • the object of the present invention is to overcome these problems relating to the assembling of a tap selector
  • a tap selector according to the kind described in the introduction to the description includes the specific features that each of at least some of the current collector arms is assembled from two separate parts joined together, namely an inner part electrically connected to a respective of the moving contacts and an outer part connected to the conductor.
  • a current collector arms is made up of two separate parts it will be possible to insert the unit with the moving contacts into a surrounding insulating cylinder with only the inner part of the respective current collector arm attached to the moving contact. Thereby the assembly can be made much easier.
  • the outer part of the respective current collector arm can be attached to the inner part after insertion of these into the insulating cylinder.
  • the tap selector includes a rod on which each of the moving contacts are mounted and a cylindrical insulating wall surrounding the rod, the cylindrical insulating wall having a plurality of openings through which openings a respective current collector arm extends.
  • At least a major portion of the inner part is located on the inside of the cylindrical insulating wall and at least a major portion of the outer part is located on the outside of the insulating wall.
  • this relative location and extension of the respective part further contribute to a simple assembly.
  • the inner part has a length that is larger than the length of the outer part.
  • At least one of the inner and outer parts has a shielding projection.
  • the shielding projection on either or both parts makes it possible to operate at higher voltages without disturbing effects from the current collector arm.
  • a shielding projection on each part It is advantageous to arrange the shielding projection as a ring around the respective part so as to provide shielding in all directions perpendicular to the current collector arm.
  • the shielding projection is preferably made in one piece with the respective part in order to facilitate manufacture.
  • each shielding portion is located close to the shielding wall.
  • the shielding thereby is provided in the region where it is most important to attain this.
  • the inner and outer parts are joined together by screw means.
  • the screw means includes at least one screw, each screw having a direction that mainly extends in the longitudinal direction of the current collector arm, and each screw is inserted through a hole in the outer part and extends into a threaded hole in the inner part.
  • Screwing the parts together thereby will be particularly easy.
  • Preferably two screws are used.
  • a screw joint of this kind also has the advantage that the parts do not have to be rotated in relation to each other when joining them.
  • the angular orientation of the outer part thereby will be well defined which is advantageous for the connection thereof to the conductor leading to the diverter switch.
  • the screw means includes two screws directed such that the screws converge in a direction from the outer part towards the inner part.
  • the oblique arrangement of the screws allows to have a distance between the screw heads at the outer end of the outer part that is sufficient large for conveniently screwing the screws, whereas the inner part can be relatively thin and need not be dimensioned thicker only for the purpose of providing a corresponding distance at that end of the screws.
  • the invention also relates to a tap changer that includes a tap selector according to the present invention, in particular according to any of the preferred embodiments thereof.
  • the invention relates to a transformer that is provided with a tap changer according to the present invention.
  • the object of the present invention is according to the second aspect thereof achieved in that a method of the kind mentioned in the introduction to the description includes the specific steps of
  • the method is performed with components corresponding to the components of the invented tap selector, in particular to any of the preferred embodiments thereof.
  • the invented tap changer, the invented transformer and the invented method have advantages of similar kinds as those of the invented tap selector and the preferred embodiments thereof, which advantages have been described above,
  • Fig 1a - 1c schematically illustrates a tap changer.
  • Fig. 1 a is a single-phase diagram of a tap changer 100 of a kind for which the device according to the present invention is intended.
  • the tap changer 100 is connected to a regulating winding of a transformer and has a set of different taps 102, in this case the number of taps is 16, but the number might be some other, for example any number from 5 to 35..
  • the tap changer of fig. 1 a is of diverter switch type, and comprises a diverter switch 120 and a tap selector 110.
  • the tap selector 110 of Fig.1 operates with pre-selection and fine selection, and thus comprises a pre-selector arm 51 and a fine selector arm 101. Both the pre-selector arm 51 and the fine selector arm 101 operate by a respective rotational movement as illustrated in fig 1b and 1c .
  • the pre-selector arm 51 is movable between two fixed contacts and the fine selector arm 101 can be brought into contact with either of 5-9 different contacts. The combined positioning of the pre-selector arm 51 and the fine selector arm 101 thereby represents up to 35 different taps.
  • the diverter switch 120 in a known manner has a set of breakers, e.g. vacuum breakers. When it is required to change from one tap to another, these breakers are opened and closed in a certain sequence. This allows the selector arms 51, 101 to respectively move from one fixed contact to an adjacent fixed contact.
  • breakers e.g. vacuum breakers.
  • Fig. 2 is a side view of parts of a tap selector according to the invention.
  • a central rod 30 is provided with a plurality of moving contacts 31.
  • a fixed contact (not shown) can be brought into contact with a selected one of the moving contacts 31.
  • To each moving contact 31 a current collector arm 32 is fixedly connected.
  • the outer end of each current collector arm 32 is arranged to be fixedly connected to a conductor (not shown) leading to the diverter switch.
  • the rod 30 is concentrically surrounded by an insulating cylinder 33, of which only a part is shown in the figure.
  • Each current collector arm 32 extends through a respective opening 36 in the insulating cylinder 33.
  • the current collector arm 32 might be a solid metal bar e.g. of copper, brass or the like.
  • the current collector arm 32 is made from two separate parts that are joined together, an inner part 32a and an outer part 32b.
  • the inner part 32a extends from the moving contact radially outward to a short distance from the insulating cylinder 33.
  • the outer part 32b extends from its outer end connectable to the conductor and through the opening 36 in the insulating cylinder 33 until it meets the inner part 32a just inside the insulating cylinder 33.
  • Fig. 3 illustrates the current collector arm 32 more in detail, partly in section.
  • the two parts thereof meet each other at the outer end surface 43 of the inner part 32a, which is located just inside the insulating cylinder 33.
  • the two parts are joined together by a pair of screws 39.
  • Each screw 39 extends through a non-threaded hole 38 in the outer part 32b and into threaded hole 37 in the inner part 32a.
  • the screws extend mainly in the longitudinal direction of the current collector arm 32, but are slightly converging to each other in the inward direction.
  • Recesses 41 are provided for the screw heads 40.
  • a hole 42 is provided for connection to the conductor to the diverter switch.
  • the inner part 32a at its outer end has a shielding projection 34 that is ring-shaped around the same.
  • a similar ring-shaped shielding projection 35 is arranged at the inner end of the outer part 32b.
  • the current collector arm 32 is shown in a side view and in fig. 5 in a view from above.
  • the shape of the outer end of the outer part 32b can be seen, with a flat surface 44 in a vertical plane is arranged on each side for the mounting to the conductor to the diverter switch.
  • the rod 30 with the moving contacts 31 and the inner parts 32a of the current collector arms 32 connected to a respective one of these is inserted axially into the cylindrical insulating wall 33. This can easily be done by aid of gravity. Then the rod 30 is oriented such that each inner part 32a becomes aligned with a respective opening 36 in the cylindrical insulating wall 33. Thereafter an outer part 32b is inserted through each opening 36 such that it comes into contact with a respective inner part 32a and with the holes 37, 38 aligned with each other..
  • each current collector arm 32 can be connected to the conductor to the diverter switch by means of the mounting holes 42 at the flat surfaces 44 at the very outer ends thereof.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)

Claims (13)

  1. Kontaktfahnen-Wähleinrichtung für einen Kontaktfahnenwechsler, wobei die Kontaktfahnen-Wähleinrichtung mehrere bewegliche Kontakte (31) aufweist, wobei jeder bewegliche Kontakt (31) mit einem entsprechenden Stromsammelarm (32) elektrisch verbunden ist, wobei jeder Stromsammelarm (32) mit einem Leiter für eine elektrische Verbindung mit einem Umleitschalter elektrisch verbunden ist, dadurch gekennzeichnet, dass wenigstens einige der Stromsammelarme (32) aus zwei getrennten und zusammengefügten Teilen (32a, 32b), nämlich aus einem inneren Teil (32a), das mit einem Entsprechenden der beweglichen Kontakte (31) beweglich verbunden ist, und einem äußeren Teil (32b), der mit dem Leiter verbunden ist, montiert sind.
  2. Kontaktfahnen-Wähleinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Kontaktfahnen-Wähleinrichtung einen Stab (30), an dem jeder der beweglichen Kontakte (31) montiert ist, und eine zylindrische Isolationswand (33), die den Stab (30) umgibt, aufweist, wobei die zylindrische Isolationswand (33) mehrere Öffnungen (36) besitzt, durch die jeweils ein Stromsammelarm (32) verläuft.
  3. Kontaktfahnen-Wähleinrichtung nach Anspruch 2, dadurch gekennzeichnet, dass sich wenigstens ein Hauptabschnitt des inneren Teils (32a) auf einer Innenseite der zylindrischen Isolationswand (33) befindet und sich wenigstens ein Hauptabschnitt des äußeren Teils (32b) auf der Außenseite der Isolationswand (33) befindet.
  4. Kontaktfahnen-Wähleinrichtung nach einem der Ansprüche 1-3, dadurch gekennzeichnet, dass der innere Teil (32a) eine Länge besitzt, die größer als die Länge des äußeren Teils (32b) ist.
  5. Kontaktfahnen-Wähleinrichtung nach einem der Ansprüche 1-4, dadurch gekennzeichnet, dass der innere Teil (32a) und/oder der äußere Teil (32b) einen Abschirmvorsprung (34, 35) besitzen.
  6. Kontaktfahnen-Wähleinrichtung nach Anspruch 5, dadurch gekennzeichnet, dass sich jeder Abschirmvorsprung (34, 35) in der Nähe der Isolationswand (33) befindet.
  7. Kontaktfahnen-Wähleinrichtung nach einem der Ansprüche 1-6, dadurch gekennzeichnet, dass der innere Teil (32a) und der äußere Teil (32b) durch Schraubenmittel zusammengefügt sind.
  8. Kontaktfahnen-Wähleinrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Schraubenmittel wenigstens eine Schraube (39) umfassen, wobei jede Schraube (39) eine Richtung hat, die sich hauptsächlich in der Längsrichtung des Stromsammelarms (32) erstreckt, und wobei jede Schraube (39) in ein Loch (38) in dem äußeren Teil (32b) eingesetzt ist und sich in eine Gewindebohrung (37) in dem inneren Teil (32a) erstreckt.
  9. Kontaktfahnen-Wähleinrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die Schraubenmittel zwei Schrauben (39) umfassen, die so orientiert sind, dass die Schrauben (39) in einer Richtung von dem äußeren Teil (32b) zu dem inneren Teil (32a) zusammenlaufen.
  10. Kontaktfahnenwechsler, dadurch gekennzeichnet, dass der Kontaktfahnenwechsler eine Kontaktfahnen-Wähleinrichtung nach einem der Ansprüche 1-9 umfasst.
  11. Transformator, dadurch gekennzeichnet, dass der Transformator einen Kontaktfahnenwechsler nach Anspruch 10 umfasst.
  12. Verfahren zum Montieren einer Kontaktfahnen-Wähleinrichtung für einen Kontaktfahnenwechsler, wobei das Verfahren den Schritt des Bereitstellens eines Stabs (30) mit mehreren beweglichen Kontakten (31) umfasst, dadurch gekennzeichnet, dass das Verfahren ferner die folgenden Schritte umfasst:
    - Befestigen eines inneren Teils (32a) eines Stromsammelarms (32) an jedem beweglichen Kontakt (31),
    - Bereitstellen eines Isolationszylinders (33),
    - Ausbilden mehrerer Öffnungen (36) in dem Isolationszylinder (33),
    - Einsetzen des Stabs (30) in axialer Richtung in den Isolationszylinder (33),
    - Positionieren des Stabs (30) in der Weise, dass jeder innere Teil (32a) auf eine der Öffnungen (36) ausgerichtet ist,
    - Einsetzen eines äußeren Teils (32b) des Stromsammelarms (32) in jede Öffnung (36) und
    - Verbinden jedes inneren Teils (32a) mit einem Entsprechenden der äußeren Teile (32b).
  13. Verfahren nach Anspruch 12, dadurch gekennzeichnet, dass das Verfahren mit Komponenten ausgeführt wird, die den Komponenten nach einem der Ansprüche 1-9 entsprechen.
EP20120158342 2012-03-07 2012-03-07 Stufenwähler und Verfahren zur Montage eines Stufenwählers Active EP2637186B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20120158342 EP2637186B1 (de) 2012-03-07 2012-03-07 Stufenwähler und Verfahren zur Montage eines Stufenwählers
CN201310073174.6A CN103311011B (zh) 2012-03-07 2013-03-06 抽头选择器和用于组装抽头选择器的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120158342 EP2637186B1 (de) 2012-03-07 2012-03-07 Stufenwähler und Verfahren zur Montage eines Stufenwählers

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EP2637186A1 EP2637186A1 (de) 2013-09-11
EP2637186B1 true EP2637186B1 (de) 2014-09-17

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CN (1) CN103311011B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2927923B1 (de) * 2014-03-31 2017-01-04 ABB Schweiz AG Trockentransformatorlastschalter
EP2980820B1 (de) * 2014-08-01 2016-09-28 ABB Schweiz AG Laststufenschalter für Trockenwandler und Trockenwandler damit
EP2985773A1 (de) * 2014-08-13 2016-02-17 ABB Technology AG Laststufenschalter für Trockentransformator und Trockentransformator damit
EP3761334B1 (de) * 2019-07-01 2024-01-24 Hitachi Energy Ltd Stufenschalter in einem leistungstransformator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3652812A (en) * 1970-09-28 1972-03-28 Westinghouse Electric Corp Tap changer switch with radial pressurized movable contact structure
JPH0758653B2 (ja) * 1986-12-12 1995-06-21 株式会社日立製作所 変圧器用タツプ切換器
DE3801152A1 (de) * 1988-01-16 1989-07-27 Reinhausen Maschf Scheubeck In einer isolierstoffwand sitzende kontaktanordnung fuer stufenwaehler von stufentransformatoren
DE3936420A1 (de) * 1989-11-02 1991-05-08 Reinhausen Maschf Scheubeck Kontaktanordnung mit abschirmung fuer stufenschalter von stufentransformatoren
DE4138000C1 (de) * 1991-11-19 1993-03-04 Maschinenfabrik Reinhausen Gmbh, 8400 Regensburg, De
CN201167022Y (zh) * 2008-02-26 2008-12-17 上海华明电力设备制造有限公司 无励磁分接开关笼体条板卸荷式结构
CN101572174B (zh) * 2009-03-06 2013-03-13 武汉泰普变压器开关有限公司 一种卸荷型无励磁分接开关

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Publication number Publication date
CN103311011A (zh) 2013-09-18
EP2637186A1 (de) 2013-09-11
CN103311011B (zh) 2016-11-16

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