EP0354423B1 - Cylindrical tap selector for step-down transformers having contact rings held in place by connecting wires - Google Patents

Cylindrical tap selector for step-down transformers having contact rings held in place by connecting wires Download PDF

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Publication number
EP0354423B1
EP0354423B1 EP89113946A EP89113946A EP0354423B1 EP 0354423 B1 EP0354423 B1 EP 0354423B1 EP 89113946 A EP89113946 A EP 89113946A EP 89113946 A EP89113946 A EP 89113946A EP 0354423 B1 EP0354423 B1 EP 0354423B1
Authority
EP
European Patent Office
Prior art keywords
insulating material
ring
contact
cylinder
tap selector
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
EP89113946A
Other languages
German (de)
French (fr)
Other versions
EP0354423A1 (en
Inventor
Alexander Bleibtreu
Leo Ing. Grad. Pillmeier
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.)
Maschinenfabrik Reinhausen GmbH
Original Assignee
Maschinenfabrik Reinhausen GmbH
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 Maschinenfabrik Reinhausen GmbH filed Critical Maschinenfabrik Reinhausen GmbH
Priority to AT89113946T priority Critical patent/ATE85149T1/en
Publication of EP0354423A1 publication Critical patent/EP0354423A1/en
Application granted granted Critical
Publication of EP0354423B1 publication Critical patent/EP0354423B1/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
    • 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
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals

Definitions

  • the invention relates to a cylindrical step selector for step transformers according to the preamble of claim 1.
  • the rigid connecting lines are additionally supported in several levels by comb-like scaffolding parts (AT-PS 199 759).
  • This support of the connecting lines therefore requires special construction parts that lie outside the actual tap selector and thus also take up additional space.
  • mounting the rigid connection cables can result in tension on the contact ring, especially since considerable lever lengths can occur due to the size of the step selector. As a result, the smooth movement of the rotary motion of the selector shaft can be impaired.
  • the object of the invention is therefore to provide an additional securing of the position of the contact ring in the step selector mentioned at the outset, so that tilting or tensioning of the contact ring on the selector shaft can be practically ruled out. This object is achieved by the means specified in the characterizing part of patent claim 1.
  • the advantage achieved by the invention lies in the additional securing of the position of the contact ring, which takes place completely independently of the connecting line and also does not take up any additional space. Furthermore, the contact ring is fixed practically on the supporting frame of the step selector, that is to say on the insulating cylinder and thus also independently of the selector shaft of the step selector. The contact ring is supported exclusively via parts made of insulating material, and these parts are locked together by cams or corresponding recesses.
  • the tap selector has a load-bearing insulating cylinder 1, which carries the fixed step contacts 2 of the contact planes. It also has a tubular switching shaft 3 arranged in the center of the insulating material cylinder 1, which can be rotated step by step in the usual way.
  • a contact ring 4 is provided, which is arranged around the selector shaft 3 and which is held by means of the connecting line 5.
  • the contact bridge 6 is held and guided by a support arm 7 seated on the control shaft 3.
  • the contact ring 4 is in turn seated on an insulating ring 8 and is locked to the latter via cams 9.
  • the insulating ring 8 is pushed over the selector shaft 3 and is supported on the insulating cylinder 1 with three struts 10 arranged in a star shape.
  • each strut 10 is provided with a cam 11 which engages in a corresponding recess in the insulating cylinder. This results in a stable position of the insulating ring 8, which is ultimately based on the supporting structure of the step selector, namely the insulating cylinder 1.
  • the insulating ring 8 can thus also serve as a guide or as a bearing for the selector shaft 3. Impairment of its position by connecting the connecting line 5 is practically impossible.

Abstract

Cylindrical tap selector for step-down transformers in which fixed step contacts (2) are seated in at least one plane in the wall of an insulating material cylinder (1). A contact bridge (6) is provided for each plane, the inner end of which brushes against a contact ring (4) lying in the same plane which is arranged around a tubular operating shaft (3) made of insulating material guiding the contact bridge. The contact ring (4) is seated here on a ring (8) made of insulating material arranged around the operating shaft (3) and is locked to the latter by means of a plurality of dogs (9). The insulating material ring (8) is carried by at least three struts (10) made of insulating material which are supported on the wall of the insulating material cylinder (1). <IMAGE>

Description

Die Erfindung bezieht sich auf einen zylindrischen Stufenwähler für Stufentransformatoren gemäß Oberbegriff des Patentanspruches 1. Um bei diesen bekannten Stufenwählern eine sichere und stabile Halterung des Kontaktringes zu erreichen, werden die an sich starren Verbindungsleitungen zusätzlich in mehreren Ebenen durch kammartige Gerüstteile abgestützt (AT-PS 199 759). Dieses Abstützen der Anschlußleitungen erfordert also besondere Konstruktionsteile, die außerhalb des eigentlichen Stufenwählers liegen und die somit auch zusätzlichen Platz beanspruchen. Trotzdem kann es bei Montage der an sich starren Anschlußleitungen zu Verspannungen am Kontaktring kommen, zumal beachtliche Hebellängen, bedingt durch die Größe der Stufenwähler, auftreten können. Hierdurch kann die Leichtgängigkeit der Drehbeweglichkeit der Schaltwelle beeinträchtigt werden.The invention relates to a cylindrical step selector for step transformers according to the preamble of claim 1. In order to achieve a secure and stable mounting of the contact ring in these known step selectors, the rigid connecting lines are additionally supported in several levels by comb-like scaffolding parts (AT-PS 199 759). This support of the connecting lines therefore requires special construction parts that lie outside the actual tap selector and thus also take up additional space. Nevertheless, mounting the rigid connection cables can result in tension on the contact ring, especially since considerable lever lengths can occur due to the size of the step selector. As a result, the smooth movement of the rotary motion of the selector shaft can be impaired.

Aufgabe der Erfindung ist es deshalb, bei dem eingangs genannten Stufenwähler eine zusätzliche Sicherung der Lage des Kontaktringes anzugeben, so daß ein Verkanten oder ein Verspannen des Kontaktringes auf der Schaltwelle praktisch ausgeschlossen werden kann. Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruches 1 angegebenen Mittel gelöst.The object of the invention is therefore to provide an additional securing of the position of the contact ring in the step selector mentioned at the outset, so that tilting or tensioning of the contact ring on the selector shaft can be practically ruled out. This object is achieved by the means specified in the characterizing part of patent claim 1.

Der mit der Erfindung erzielte Vorteil liegt in der zusätzlichen Sicherung der Lage des Kontaktringes, was völlig unabhängig von der Anschlußleitung erfolgt und auch keinen zusätzlichen Platz beansprucht. Ferner erfolgt das Fixieren des Kontaktringes praktisch am tragenden Gerüst des Stufenwählers, also am Isolierzylinder und somit auch unabhängig von der Schaltwelle des Stufenwählers. Das Abstützen des Kontaktringes erfolgt hierbei ausschließlich über Teile aus Isolierstoff, und diese Teile werden durch Nocken bzw. entsprechende Ausnehmungen miteinander verrastet.The advantage achieved by the invention lies in the additional securing of the position of the contact ring, which takes place completely independently of the connecting line and also does not take up any additional space. Furthermore, the contact ring is fixed practically on the supporting frame of the step selector, that is to say on the insulating cylinder and thus also independently of the selector shaft of the step selector. The contact ring is supported exclusively via parts made of insulating material, and these parts are locked together by cams or corresponding recesses.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachstehend näher beschrieben. Die Zeichnung zeigt ausschnittsweise den Bereich einer Kontaktebene des Stufenwählers. Selbstverständlich kann der Stufenwähler mehrere dieser Kontaktebenen aufweisen. Wie ersichtlich, besitzt der Stufenwähler einen tragenden Isolierstoffzylinder 1, der jeweils die feststehenden Stufenkontakte 2 der Kontaktebenen trägt. Er besitzt ferner eine im Zentrum des Isolierstoffzylinders 1 angeordnete rohrförmige Schaltwelle 3, die auf übliche Weise schrittweise drehbar ist. Für jede Kontaktebene ist ein Kontaktring 4 vorgesehen, der um die Schaltwelle 3 herum angeordnet ist und der mittels der Anschlußleitung 5 gehalten wird. Eine Kontaktbrücke 6, die ständig am Kontaktring 4 schleift, dient der Verbindung des Kontaktringes 4 mit den einzelnen feststehenden Stufenkontakten 2. Die Kontaktbrücke 6 wird von einem an der Schaltwelle 3 sitzenden Tragarm 7 gehalten und geführt. Der Kontaktring 4 sitzt nun seinerseits auf einem Isolierstoffring 8 und ist über Nocken 9 mit diesem verrastet. Der Isolierstoffring 8 ist über die Schaltwelle 3 geschoben und stützt sich mit drei sternförmig angeordneten Streben 10 am Isolierstoffzylinder 1 ab. Zu diesem Zweck ist jede Strebe 10 mit einem Nocken 11 versehen, die in eine entsprechende Ausnehmung im Isolierstoffzylinder eingreift. Somit ergibt sich eine stabile Lage des Isolierstoffringes 8, die letztendlich durch das tragende Gerüst des Stufenwählers, nämlich durch den Isolierstoffzylinder 1, begründet ist. Der Isolierstoffring 8 kann somit auch als Führung bzw. als Lager für die Schaltwelle 3 dienen. Eine Beeinträchtigung seiner Lage durch das Anschließen der Anschlußleitung 5 ist praktisch ausgeschlossen.An embodiment of the invention is shown in the drawing and will be described in more detail below. The drawing shows a section of the area of a contact level of the tap changer. Of course, the tap selector can have several of these contact levels. As can be seen, the step selector has a load-bearing insulating cylinder 1, which carries the fixed step contacts 2 of the contact planes. It also has a tubular switching shaft 3 arranged in the center of the insulating material cylinder 1, which can be rotated step by step in the usual way. For each contact level, a contact ring 4 is provided, which is arranged around the selector shaft 3 and which is held by means of the connecting line 5. A contact bridge 6, which constantly grinds on the contact ring 4, serves to connect the contact ring 4 to the individual fixed step contacts 2. The contact bridge 6 is held and guided by a support arm 7 seated on the control shaft 3. The contact ring 4 is in turn seated on an insulating ring 8 and is locked to the latter via cams 9. The insulating ring 8 is pushed over the selector shaft 3 and is supported on the insulating cylinder 1 with three struts 10 arranged in a star shape. For this purpose, each strut 10 is provided with a cam 11 which engages in a corresponding recess in the insulating cylinder. This results in a stable position of the insulating ring 8, which is ultimately based on the supporting structure of the step selector, namely the insulating cylinder 1. The insulating ring 8 can thus also serve as a guide or as a bearing for the selector shaft 3. Impairment of its position by connecting the connecting line 5 is practically impossible.

Claims (2)

  1. Cylindrical tap selector for tapped transformers, in which stationary tap contacts (2) are seated in at least one plane in the wall of a cylinder (1) of insulating material and in which a contact bridge (6) is provided for each plane, the inner end of which contact bridge wipes on a contact ring (4), which lies in the same plane, is arranged around a tubular switching shaft (3) of insulating material guiding the contact bridge and is fixed by means of an electrical connector (5) which is rigidly connected with the contact ring and led substantially laterally horizontally out of the cylinder of insulating material, characterised thereby that the contact ring (4) is seated on a ring (8) of insulating material, which is arranged around the switching shaft (3), and is keyed to this by means of several dogs (9) and that the ring (8) of insulating material is carried by at least three struts (10) of insulating material, which are supported at the wall of the cylinder (c) of insulating material.
  2. Cylindrical tap selector according to claim 1, characterised thereby that the struts (10), which are directly connected with the ring (8) of insulating material, are keyed to the cylinder (1) of insulating material by means of dogs (11) which engage in corresponding bores of the cylinder.
EP89113946A 1988-08-12 1989-07-28 Cylindrical tap selector for step-down transformers having contact rings held in place by connecting wires Expired - Lifetime EP0354423B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89113946T ATE85149T1 (en) 1988-08-12 1989-07-28 CYLINDRICAL TAP SELECTOR FOR TAP TRANSFORMERS WITH CONTACT RINGS RETAINED BY CONNECTING LEADS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3827388 1988-08-12
DE3827388A DE3827388A1 (en) 1988-08-12 1988-08-12 CYLINDRICAL STEP SELECTOR FOR STEP TRANSFORMERS WITH CONTACT RINGS HOLDED BY CONNECTING CABLES

Publications (2)

Publication Number Publication Date
EP0354423A1 EP0354423A1 (en) 1990-02-14
EP0354423B1 true EP0354423B1 (en) 1993-01-27

Family

ID=6360712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89113946A Expired - Lifetime EP0354423B1 (en) 1988-08-12 1989-07-28 Cylindrical tap selector for step-down transformers having contact rings held in place by connecting wires

Country Status (4)

Country Link
EP (1) EP0354423B1 (en)
JP (1) JPH02101719A (en)
AT (1) ATE85149T1 (en)
DE (2) DE3827388A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVI20040307A1 (en) * 2004-12-27 2005-03-27 Comem Spa SWITCH WITHOUT VOLTAGE WITH MANEUVER FOR ELECTRIC TRANSFORMERS

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT199759B (en) * 1955-04-18 1958-09-25 Elin Ag Elek Ind Wien Step selector for regulating transformers
DE3009052C2 (en) * 1980-03-08 1983-10-20 Maschinenfabrik Reinhausen Gebrueder Scheubeck Gmbh & Co Kg, 8400 Regensburg Step switch for step transformers
GB2078445B (en) * 1980-06-17 1984-04-18 Ass Tapchangers Ltd An on-load tap selector
EP0166844A1 (en) * 1984-07-04 1986-01-08 ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE CHARLEROI (ACEC) Société Anonyme Tap selector with cranked shaft

Also Published As

Publication number Publication date
DE3827388A1 (en) 1990-02-15
JPH02101719A (en) 1990-04-13
DE58903389D1 (en) 1993-03-11
EP0354423A1 (en) 1990-02-14
ATE85149T1 (en) 1993-02-15

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