EP0993010A2 - Stufenschalter für elektrische Transformatoren - Google Patents

Stufenschalter für elektrische Transformatoren Download PDF

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Publication number
EP0993010A2
EP0993010A2 EP99116761A EP99116761A EP0993010A2 EP 0993010 A2 EP0993010 A2 EP 0993010A2 EP 99116761 A EP99116761 A EP 99116761A EP 99116761 A EP99116761 A EP 99116761A EP 0993010 A2 EP0993010 A2 EP 0993010A2
Authority
EP
European Patent Office
Prior art keywords
tap changer
shaped
contacts
changer according
movable contacts
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.)
Granted
Application number
EP99116761A
Other languages
English (en)
French (fr)
Other versions
EP0993010A3 (de
EP0993010B1 (de
Inventor
Silvio Dal Lago
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.)
Comem SpA
Original Assignee
Comem SpA
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 Comem SpA filed Critical Comem SpA
Publication of EP0993010A2 publication Critical patent/EP0993010A2/de
Publication of EP0993010A3 publication Critical patent/EP0993010A3/de
Application granted granted Critical
Publication of EP0993010B1 publication Critical patent/EP0993010B1/de
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
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/40—Driving mechanisms, i.e. for transmitting driving force to the contacts using friction, toothed, or screw-and-nut gearing
    • 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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/20—Interlocking, locking, or latching mechanisms
    • H01H9/28—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member
    • 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
    • H01H9/20—Interlocking, locking, or latching mechanisms
    • H01H9/28—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member
    • H01H9/281—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member making use of a padlock

Definitions

  • the present invention relates to a tap changer for electric transformers.
  • Conventional electric tap changers for transformers are substantially composed of a rod-like body which rigidly supports fixed pin-like contacts which are arranged at right angles in series along said body.
  • the rod-like body is the sliding guide for a sliding block which is associated with actuation means which can be actuated by the user; the sliding block is provided with at least one support for a corresponding pair of skid-like movable contacts which are slideable on the fixed contacts in mutually opposite positions and are adapted to interfere with two of the contacts alternately and in succession.
  • tap changers are substantially produced by shaping a metal lamina and as a whole are structurally rather complicated and composed of many parts.
  • the aim of the present invention is to provide a tap changer for electric transformers which solves the drawbacks noted above in conventional devices, particularly achieving greater constructive simplicity and a reduced number of components.
  • an important object of the present invention is to provide a tap changer which nonetheless allows maximum functionality and strength with respect to commercially available tap changers.
  • Another object of the present invention is to provide a tap changer which, as a whole, is adapted to reduce production costs and times.
  • Another object of the present invention is to provide a tap changer which can be manufactured with conventional technologies and systems.
  • a tap changer particularly for electric transformers which comprises a rod-like body which rigidly supports fixed pin-like contacts arranged at right angles and in series along said rod-like body, said rod-like body constituting a sliding guide for a sliding block associated with actuation means which can be actuated by the user, said sliding block having at least one support for a corresponding pair of skid-like movable contacts which are slideable on said fixed contacts in mutually opposite positions and are adapted to interfere with two of said fixed contacts alternately and in succession, characterized in that said at least one support is constituted by a base from which two mutually parallel walls for sliding on said rod-like body protrude, said base being shaped so as to form seats for said two movable contacts, each one of said movable contacts being shaped so as to form at least one anchoring tab which is shaped complementarily to a corresponding guide for retaining said base, a spring being provided which is shaped so as to have two pairs of arms which
  • a tap changer for electric transformers according to the invention is generally designated by the reference numeral 10.
  • the tap changer 10 comprises a rod-like body 11 which has a substantially rectangular transverse cross-section and supports fixed pin-like contacts 13 which are rigidly coupled thereto and are arranged at right angles in series along it.
  • the rod-like body 11 constitutes a sliding guide for a sliding block 12b which is associated with actuation means, generally designated by the reference numeral 12a and described in greater detail hereinafter, which can be actuated by the user.
  • the sliding block 12b carries at least one support and, in this case, three supports 14, one for each corresponding pair of movable skid-like contacts 15 which are slideable on said fixed contacts 13 in mutually opposite positions and are adapted to interfere with two of the fixed contacts alternately and in succession.
  • Each one of the supports 14 comprises a base 16 from which two mutually parallel walls 17 for sliding on the rod-like body protrude.
  • the walls 17 have, on their mutually opposite inner faces, ribs 18 which as a whole are adapted to form guides 19 for sliding with respect to the body 11.
  • the base 16 is also shaped so as to form a slot 24 for inserting (one at a time) two movable contacts 15, each of which comprises, in this case, a strip 21 made of conducting material which is shaped so as to form, again in this case, two tabs 22 which have a substantially dovetail edge which is shaped complementarily to corresponding regions of the base 16 which constitute a corresponding number of retention guides for them.
  • the tap changer 10 further comprises, for each one of the supports 14, a corresponding locking spring, generally designated by the reference numeral 23, which is adapted to force toward each other two corresponding movable contacts 15, facilitating interference with the interposed fixed contacts 13.
  • the base 16 is substantially frame-like.
  • the slot 24 for the insertion of the movable contacts 15 is such that once said movable contacts have been inserted and the spring 23 has been applied, disengagement is not possible.
  • a pin 25 for anchoring to the sliding block 12b protrudes from each one of the supports 14.
  • the spring 23 is instead formed by blanking and plastic deformation from a metal lamina 26 which has four mutually independent arms 27, each of which has a hook-shaped end 28 for coupling to corresponding seats 29 formed in corresponding movable contacts 15.
  • each one of the movable contacts 15 also has, on mutually opposite edges, curved regions 30 which are adapted to facilitate sliding on said fixed contacts 13.
  • the actuation means 12a are constituted, in this embodiment, by a longitudinal rack 13 which is integrated with the sliding block 12b and is coupled to a pinion 32 which is fixed to a composite knob 33 which is fixed to the transformer, of which only part of the frame 12c is visible, and which can be actuated manually by the operator.
  • the composite knob 33 also comprises, again in this embodiment, a shaped support 34 for the body 11, with an axial hole 35 in which a shaft 36 is rotatably inserted; the end of the shaft 36 that is directed toward the inside of the transformer 37 is fixed to the pinion 32, while the other end 38 is fixed to controlled movement means which can be actuated manually by the operator.
  • Such movement means comprise, in a substantially coaxial arrangement, a cap 39 (the knob proper), which is actually available for actuation by the user and is associated with a locking element 40 and, thanks to the interposition of an elastic counterthrust element constituted in this case by a helical spring 41, an adjustable positioning element which is substantially constituted by a flanged cup 42 which has an open bottom and a corresponding shaped rim so as to form a series of substantially semicircular protrusions 43 which are kept inserted, until the operator acts in a different direction of rotation, in corresponding seats 44 formed circumferentially in an annular gasket presser 45.
  • the locking element 40 is constituted in this case by an externally threaded tubular portion 46 which has a screw-and-nut coupling with a threaded hole 47 formed coaxially in the locking head 39.
  • a head 48 is also associated with the threaded portion 46 and can be actuated by the user by means of adapted cross-shaped ribs 49.
  • the composite knob 33 furthermore has, in this case, annular sealing gaskets, all of which are designated by the reference numeral 50.
  • a device for locking the composite knob 33 which comprises a tab 51 protruding radially from the cup 42 and has an axial protrusion 52 inserted in an adapted through hole 53 of a tab 54 which protrudes radially from the cap 39.
  • the axial protrusion 52 has two through holes 55 at different levels in which it is possible to insert a padlock, not shown, which locks the movement of the cup 42.
  • the locking element 40 is replaced with two combined elements: an externally threaded bush 40a, to be coupled to the thread of the hole 47, and a knob 40b, to be coupled to the bush 40a.
  • the bush in fact has a cross-shaped axial through hole 40c in which a complementarily shaped tab 40d of the knob 40b fits.
  • the knob 40b also has a frustum-shaped external protrusion 40e which couples by snap action and elastic deformation with an undercut seat, not shown in the Figures, of the cap 39, with which it is accordingly stably associated.
  • the structure of the tap changer allows easy adaptability to various kinds of transformer even if already in production.
  • the composite knob 33 is adapted for a plurality of frame thicknesses because axial adaptation of the gasket presser 45 occurs, raising or lowering the cup 42, the spring 41 and the cap 39.
  • the structure of the tap changer is such that when the plug 40, however provided, is fixed, the protrusions 43 are forced toward the correct position.
  • the materials and the dimensions may be any according to the requirements.

Landscapes

  • Push-Button Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Keying Circuit Devices (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Slide Switches (AREA)
EP99116761A 1998-10-06 1999-08-30 Stufenschalter für elektrische Transformatoren Expired - Lifetime EP0993010B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998PD000094U IT245092Y1 (it) 1998-10-06 1998-10-06 Struttura di commutatore per trasformatori elettrici.
ITPD980094U 1998-10-06

Publications (3)

Publication Number Publication Date
EP0993010A2 true EP0993010A2 (de) 2000-04-12
EP0993010A3 EP0993010A3 (de) 2001-09-05
EP0993010B1 EP0993010B1 (de) 2006-05-10

Family

ID=11392174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99116761A Expired - Lifetime EP0993010B1 (de) 1998-10-06 1999-08-30 Stufenschalter für elektrische Transformatoren

Country Status (8)

Country Link
EP (1) EP0993010B1 (de)
AT (1) ATE326058T1 (de)
CY (1) CY1105121T1 (de)
DE (1) DE69931229T2 (de)
DK (1) DK0993010T3 (de)
ES (1) ES2264817T3 (de)
IT (1) IT245092Y1 (de)
PT (1) PT993010E (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102789911A (zh) * 2012-08-20 2012-11-21 武汉泰普变压器开关有限公司 无励磁条形分接开关
EP3007193A1 (de) * 2014-10-10 2016-04-13 Elettromaule Component S.r.l. Abzapfwechsler für ölgefüllte, elektrische transformatoren
WO2016198922A1 (pt) * 2015-06-12 2016-12-15 Riotrafo Ltda Comutador longitudinal, para sistema de mudança de posição e travamento no contato elétrico

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1562235A (de) * 1968-02-22 1969-04-04
FR2142219A5 (de) * 1971-06-17 1973-01-26 Gerardin Maurice
DE2738144A1 (de) * 1977-08-24 1979-03-01 Reinhausen Maschf Scheubeck Anzapfumsteller zum aendern des uebersetzungsverhaeltnisses eines transformators

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102789911A (zh) * 2012-08-20 2012-11-21 武汉泰普变压器开关有限公司 无励磁条形分接开关
EP3007193A1 (de) * 2014-10-10 2016-04-13 Elettromaule Component S.r.l. Abzapfwechsler für ölgefüllte, elektrische transformatoren
WO2016198922A1 (pt) * 2015-06-12 2016-12-15 Riotrafo Ltda Comutador longitudinal, para sistema de mudança de posição e travamento no contato elétrico

Also Published As

Publication number Publication date
PT993010E (pt) 2006-09-29
DE69931229T2 (de) 2007-03-01
ES2264817T3 (es) 2007-01-16
DK0993010T3 (da) 2006-09-18
EP0993010A3 (de) 2001-09-05
CY1105121T1 (el) 2009-11-04
IT245092Y1 (it) 2002-03-19
EP0993010B1 (de) 2006-05-10
ITPD980094U1 (it) 2000-04-06
DE69931229D1 (de) 2006-06-14
ATE326058T1 (de) 2006-06-15

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