US2672586A - On-load tap changer for transformers - Google Patents

On-load tap changer for transformers Download PDF

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Publication number
US2672586A
US2672586A US249695A US24969551A US2672586A US 2672586 A US2672586 A US 2672586A US 249695 A US249695 A US 249695A US 24969551 A US24969551 A US 24969551A US 2672586 A US2672586 A US 2672586A
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US
United States
Prior art keywords
contact
contacts
tap
winding
tap changer
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
US249695A
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English (en)
Inventor
Olsson Uno
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 Norden Holding AB
Original Assignee
ASEA AB
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
Priority claimed from GB3021150A external-priority patent/GB673804A/en
Application filed by ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US2672586A publication Critical patent/US2672586A/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
    • 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
    • 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
    • H01H2003/405—Driving mechanisms, i.e. for transmitting driving force to the contacts using friction, toothed, or screw-and-nut gearing using a walking nut
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/1987—Rotary bodies
    • Y10T74/19884—Irregular teeth and bodies

Definitions

  • On-load tap changers for transformers have for their object to perform a change-over of a terminal or" a winding from one tap to another in the same winding or in a separate regulating winding in rsuch a manner that the load current can flow through the transformer without interruption at any time during a tap change.
  • the change-over from one tap to another is made in two steps by means of two alternately acting contacts, one of which first connects the terminal to a succeeding tap over an impedance, the direct connection then being made by means of the other contact.
  • the ⁇ tap changer may be provided with a switch by means of which the parts of the regulating winding are successively disconnected and then again successively connected in, but in the opposite direction.
  • the present invention concerns an arrangement in tap changers either for actuating the said alternately acting Ycontacts of the said switch,
  • a driving member running with a substantially constant speed, for instance a directly coupled motor or a iiywheel with stored energy, and in such a manner that the contacts are moved practically momentarily from one contactposition to another and remain in this position until the time comes for removal to the next contact position.
  • the desired motion oi the contacts of the tap changer is attained by means of simple and reliable elements and a driving member running with a practically constant speed.
  • the invention is chiefly characterised in that between the driving member and the contacts oi the tap changer there is inserted a toothed gear train which comprises at least three seriesconnected non-circular, for instance elliptical, toothed wheels.
  • the gear mechanism may comprise two parallel trains of wheels, which are driven from a common pinion driven by the driving member,
  • this gear mechanism may comprise a third wheel train, driving the said switch.
  • a tap changer of the type comprising a switch for connecting a regulating winding either in the same direction as the main winding or in the opposite direction, and with a resistor as current-limiting impedance.
  • 2 designates a drivingr shaft which is connected with a continuously moving driving member, for example a motor, not shown in the drawing.
  • An elliptical pinion .3 mounted on shaft 2 engages two elliptical toothed wheels 4' and l, which in turn engage elliptical toothed wheels 5' and 5, which are secured to the partially screw-threaded shafts 6', 6", respectively.
  • nuts i and T" are mounted, which are mechanically, but not electrically, connected with contacts 8 and 8" respectively. These contacts slide on contact bars Il and Ii", and during their motion along lthese bars are brought into contact with tap contacts iti- M9 and iti-M9, respectively.
  • tap contacts other than contacts and
  • 55 are connected to one end of the main winding 9.
  • the contact bar i i is directly connected with the line terminal l2 to the transformer, whereas the contact bar Il is connected with line terminal l2 through a resistance i3.
  • i pinion 2l is also mounted on the shaft 2 and engages an intermediary wheel 22.
  • a nut I6 is mounted which is mechanically, but not electrically, connected with a contact i9 sliding on a contact bar 28, and is alternately brought into contact with the contacts I9 and 20.
  • the contact bar 28 is directly connected with the main winding 9 of the transformer, the contact I9 is connected with one end of the regulating winding I0, and the contact 20 is connected With the other end of said Winding.
  • the arrangement acts in the following way: In the position of the contacts 8' and 8", shown on the drawing, the line terminal I2 of the transformer is connected to the main winding 9 of the transformer over the part
  • the driving shaft 2 is in motion in such a direction that the contacts 8' and 8" are moved downwards, the nut 1" is first moved downwards one step, so that the line terminal I2 is connected with tap contact
  • the contact 8' then performs a rapid movement down to tap contact
  • a fourth part of the regulating winding is connected to the main winding, but now in opposite direction, and upon continued motion upwards of the contacts 8' and 9 the different parts of the regulating winding again are connected into circuit in series with the main winding 9, but now, as said before, in opposite direction.
  • the movement of the contact I8 from contact I9 to contact 20 is performed during the period between contact 9' leaving tap contact
  • the invention is notlimited to the form shown on the drawing but comprises all arrangements where the movement of a contact in a tap changer is performed by means of a toothed wheel train comprising at least three non-circular toothed wheels. It is not, of course, necessary that the motion of the contacts takes place along a straight line, because a circularmotion of the contacts can also be used.
  • Gear mechanism for the tap changers of a transformer with two moving contacts comprising a driving member rotating at uniform speed, a non-circular tooth gear wheel driven by said member, two non-circular idler tooth wheels both meshing with and driven by the rst-mentioned wheel, a non-circular tooth Wheel meshing with and driven by each of said idler wheels, and means whereby intermittent motion of the wheels driven by said idler wheels is transmitted to said contacts to move them with a step-by-step motion.
  • Gear mechanism for the tap changers of a transformer with two moving contacts comprising a switch for reversing a regulating winding in relation to a main transformer winding, a driving member rotating at uniform speed, a gear train having at least two non-circular tooth wheels for imparting intermittent motion to said switch from said member, two trains each having at least three non-circular tooth wheels for imparting intermittent motion to said moving contacts over the tap contacts of the winding, the first-mentioned gear train providing a large gear ratio in relation to the other gear trains so that the tap changer and the switch will effeet only one switch-over during the time the contacts of the tap changer move over all the tap contacts.

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  • Control Of Electrical Variables (AREA)
US249695A 1950-12-02 1951-10-04 On-load tap changer for transformers Expired - Lifetime US2672586A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2672586X 1950-12-02
GB3021150A GB673804A (en) 1950-12-11 1950-12-11 Improvements in or relating to on-load tap changers for transformers

Publications (1)

Publication Number Publication Date
US2672586A true US2672586A (en) 1954-03-16

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ID=32299793

Family Applications (1)

Application Number Title Priority Date Filing Date
US249695A Expired - Lifetime US2672586A (en) 1950-12-02 1951-10-04 On-load tap changer for transformers

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US (1) US2672586A (fr)
FR (1) FR1042464A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3244966A (en) * 1962-10-04 1966-04-05 Singer Co Multi-unit variable transformer device
US3415957A (en) * 1964-11-14 1968-12-10 Reinhausen Maschf Scheubeck Transfer switch for tap-changing regulating transformers having current-carrying contacts and operating means therefor achieving high initial speeds of contact separation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2325936A (en) * 1941-11-25 1943-08-03 Gen Electric Regulating circuit
US2551943A (en) * 1945-04-19 1951-05-08 John A Gulow Variable tap transformer system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2325936A (en) * 1941-11-25 1943-08-03 Gen Electric Regulating circuit
US2551943A (en) * 1945-04-19 1951-05-08 John A Gulow Variable tap transformer system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3244966A (en) * 1962-10-04 1966-04-05 Singer Co Multi-unit variable transformer device
US3415957A (en) * 1964-11-14 1968-12-10 Reinhausen Maschf Scheubeck Transfer switch for tap-changing regulating transformers having current-carrying contacts and operating means therefor achieving high initial speeds of contact separation

Also Published As

Publication number Publication date
FR1042464A (fr) 1953-11-02

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