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
  • H01H9/0027—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
  • H01H9/0005—Tap change devices
• • 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

Definitions

• the present invention refers, in general, to an off- circuit tap changer, with actuating mechanism, for electrical transformers.
• Off-circuit tap changers for electrical transformers are currently known whose structure substantially has an elongated body where a set of fixed stud contacts is integrally made orthogonally in series along the whole length of the elongated body.
• the elongated body in fact consists of a frame, which laterally has the above-mentioned fixed stud contacts, inside of which there runs at least one support for a pair of movable rubbing-block type contacts, which the user can operate by means of specific controls so that they are brought into opposing positions, and are adapted to alternatively and successively enter into interference with two of the aforementioned fixed contacts .
• ATCs rack-type high voltage tap changers
• ATVs screw-type high voltage tap changers
• the frame constitutes the sliding guide for a slide, adapted to constitute the support for the movable contacts, associated with a bar-shaped body which moves it by means of a longitudinal rack forming part of the slide and coupled with a pinion, which in turn results integral with a composite handle fixed to the transformer body, which the operator can operate by hand.
• the object of the present invention is to avoid the drawbacks mentioned and, in particular, to create an off-circuit tap changer for electrical transformers, with actuating mechanism, which shows a greater constructive simplicity and which foresees a reduced number of parts with respect to traditional solutions.
• Another object of the present invention is to create an off-circuit tap changer for electrical transformers, with actuating mechanism, which would be more functional, reliable and robust than traditional tap changers .
• a further object of the present invention is to realise an off-circuit tap changer for electrical transformers, with actuating mechanism, which would enable tap changers to be produced at a lower design and manufacturing cost than with the known techniques.
• off-circuit tap changer for electrical transformers with actuating mechanism, made according to claim 1 below.
• FIG. 1 is a perspective view of a rack-type high voltage off-circuit tap changer realised according to the known art
• FIG. 2 is a perspective view of a screw-type high voltage off-circuit tap changer made according to the present invention.
• FIG. 3 is a perspective view of an adaptor element used in the off-circuit tap changer for electrical transformers, with actuating mechanism, according to the present invention.
• FIGS. 1 and 2 show, respectively, a rack-type high voltage off-circuit tap changer (ATC) , generically indicated with 10, and a screw-type high voltage off-circuit tap changer (ATV) , generically indicated with 20.
• ATC rack-type high voltage off-circuit tap changer
• ATV screw-type high voltage off-circuit tap changer
• the ATC rack- type high voltage off-circuit tap changer for electrical transformers 10 comprises an outer frame, formed by two parallel bars 11 of substantially rectangular section, which integrally bear stud-shaped fixed contacts 12, arranged orthogonally in series.
• the movable contacts 14 are adapted to alternatively and successively enter into interference with two fixed contacts 12 of one of the bars 11 or with one fixed contact 12 and a contact strip 16 made on the parallel bar 11 which is at the desired voltage.
• the sliding guide consists of a longitudinal rack forming part of the central bar-shaped component 13 and coupled with a pinion (not shown in the Figure) , which in turn is connected to an operating device 17 for the operator to actuate.
• each of the fixed stud contacts 12 presents a threaded ring 18 associated with related distributor caps 19 for attaching the cable ends.
• guard rings 21 can be used, tightly fixed to the external structure of the bars 11 and each connected with the stud of the nearest fixed contact 12 so as to be at the same potential as that contact.
• the set of movable contacts 14 may take the form of medium-voltage fixed-point and/or pawl tap changers and is protected inside protective elements 22, realised in plastic material and double shoulder shaped in order to provide considerable stability.
• ATV high-voltage tap changer, indicated generically with 20, which differs with respect to the rack-type high-voltage tap changer 10 due to the typology of operation of the set of movable contacts 14.
• the set of movable contacts 14 is made to slide over the fixed contacts 12 by means of a worm screw 23 (the so-called “large screw") which is associated with the set of movable contacts 14 by means of a coupling component 24, which is integral with the nut thread 25 (which in the exemplifying and preferred embodiment consists of a lead nut) .
• a worm screw 23 the so-called "large screw”
• a coupling component 24 which is integral with the nut thread 25 (which in the exemplifying and preferred embodiment consists of a lead nut) .
• the worm screw 23 can be operated from the outside by means of a movement device 26 available to the operator.
• the off-circuit tap changer for electrical transformers, with actuating mechanism, according to the present invention has the same mechanical and electrical components as the tap changer typologies examined so far, and moreover is foresees an actuating mechanism (shown in detail in Figure 3) comprising a worm screw 23 (analogous to that used in the screw-type high-voltage tap changer) , coaxial and inside an insulating tube 27 preferably realised in phenolic resin, on which the nut thread is fitted or made at one end part .
• the coupling 24 is connected to the end portion of the tube 27, and bears the set of movable contacts 14, housed inside a shaped protective structure 22.
• the coupling 24 is further connected with the tube 27 by means of the interposition of a shaped adaptor 28, which allows for the coupling between the nut thread and the set of movable contacts 14.
• the overall structure of the tap changer indeed, is decidedly simpler than that of traditional ones, yet functional and robust; moreover, such structure can, as we have seen, be readily adapted to various transformer typologies, including many that have already gone into production.

Landscapes

• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
• Details Of Connecting Devices For Male And Female Coupling (AREA)
• Housings And Mounting Of Transformers (AREA)
• High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
• Slide Switches (AREA)
• Push-Button Switches (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=36121421

Family Applications (1)

Country Status (11)

Cited By (1)

Citations (4)

Family Cites Families (2)

• 2004
  • 2004-12-27 IT IT000307A patent/ITVI20040307A1/it unknown
• 2005
  • 2005-12-23 DE DE602005011180T patent/DE602005011180D1/de not_active Expired - Lifetime
  • 2005-12-23 RU RU2007122791/09A patent/RU2377683C2/ru not_active IP Right Cessation
  • 2005-12-23 WO PCT/EP2005/014179 patent/WO2006069802A1/en not_active Ceased
  • 2005-12-23 AT AT05824695T patent/ATE414982T1/de active
  • 2005-12-23 SI SI200530552T patent/SI1831904T1/sl unknown
  • 2005-12-23 ES ES05824695T patent/ES2315941T3/es not_active Expired - Lifetime
  • 2005-12-23 UA UAA200706161A patent/UA86275C2/uk unknown
  • 2005-12-23 BR BRPI0519158-0A patent/BRPI0519158A2/pt not_active IP Right Cessation
  • 2005-12-23 EP EP05824695A patent/EP1831904B1/de not_active Expired - Lifetime
  • 2005-12-23 PL PL05824695T patent/PL1831904T3/pl unknown

Patent Citations (4)

Non-Patent Citations (1)

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