US3360618A - Transfer switch for tap-changing transformers convertible for adaptation to a wide range of currents - Google Patents

Transfer switch for tap-changing transformers convertible for adaptation to a wide range of currents Download PDF

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Publication number
US3360618A
US3360618A US542702A US54270266A US3360618A US 3360618 A US3360618 A US 3360618A US 542702 A US542702 A US 542702A US 54270266 A US54270266 A US 54270266A US 3360618 A US3360618 A US 3360618A
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US
United States
Prior art keywords
contacts
main
shaft
movable
auxiliary
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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
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US542702A
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English (en)
Inventor
Schunda Anton
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.)
Scheubeck GmbH and Co
Original Assignee
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/10—Distribution boxes; Connection or junction boxes for surface mounting on a wall
    • 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

Definitions

  • Load tap-changers include selector switches and transfer switches.
  • the selector switches serve the purpose of selecting a particular tap on a tapped transformer winding intended to be connected into an electric circuit.
  • the contacts of selector switches in the process of change do not carry load currents. Hence selector switches are not required to interrupt a current-carrying circuit, or to close on a current-carrying circuit. As a result, the contacts of selector switches are not subjected to arcing.
  • the transfer switches perform all switching operations under load and their contacts are subjected to arcing, except the currentcarrying contacts thereof the provision of which, in addition to main and auxiliary arcing contacts, is optional.
  • each pair of current-carrying contacts shunts one pair of main contacts.
  • the current-carrying contacts may be dispensed with if the currents intended to be carried continuously are relatively limited.
  • FIG. 1 is a diagram of a transfer switch embodying this invention showing a transformer energizing the transfer switch, the selector switch normally included in such a circuit being deleted in FIG. 1;
  • FIG. 2 is a vertical section of a transfer switch embodying this invention, main current-carrying contacts being deleted from the structure;
  • FIG. 3 is a vertical section of a portion of the structure of FIG. 1 including main current-carrying contacts;
  • F IG. 4 is a section along IVIV of FIG. 3;
  • FIG. 5 shows a portion of the structure of FIG. 3 on a larger scale and FIG. 6 is a section along VI-VI of FIG. 5.
  • FIG. 1 has been applied to indicate a cylindrical switch housing of insulating material.
  • fixed main contacts 2 and fixed auxiliary contacts 2 are arranged along a sector of a circle. Contacts 2 and 2 are abutting against and supported by the radially inner surface of switch housing 1.
  • Movable main contacts 3 are provided to cooperate with fixed main contacts 2, and movable auxiliary contacts 3 are provided to cooperate with fixed auxiliary contacts 2'.
  • Transformer winding Tr has two terminals U U The former is conductively connected to left fixed main contact 2 and left fixed current-carrying contact 25 and the latter is conductively connected to right fixed main contact 2 and right fixed current-carrying contact 25 (FIG. 1).
  • Each movable contact 3, 3 is supported by a contact support 30 the ends of which engage radial grooves 4a, 5a in a pair of horizontal plates 4, 5.
  • Each movable contact 3, 3' is insulated by a layer of insulation (not shown) from the contact support 30 by which it is supported.
  • Each contact support 30 includes a vertical operating shaft 31 whose axially outer ends rest in bearings formed by each contact support 30.
  • Each contact support further defines a central bearing for shaft 31.
  • each contact support 30 is adapted to be moved radially outwardly and radially inwardly to cause disengagement of contacts 3, 3' from contacts 2, 2, or engagement of contacts 3, 3' with contacts 2, 2'.
  • the movement of the operating shafts 31 of the several contact supports 30 is being effected by means of pairs of linkages to which reference numeral 8 has been applied.
  • the radially inner ends of the several linkages 8 pertaining to contact supports 30 of the movable contacts 3, 3' of one phase of the transfer switch are tied together by a vertical shaft 32.
  • Reference numeral -11 has been applied to indicate a main shaft formed by three vertical plates or fins enclosing angles of degrees.
  • An upper contact-operating plate 10 and a lower contactoperating plate 10 are fixedly mounted on main shaft 11 for joint pivotal motion with main shaft 11 in clockwise and counterclockwise direction.
  • Helical springs 9 are interposed between the radially outer ends of contact-operating plates 10 and the ends of shaft 32. Pivotal motion of main shaft 11 in either clockwise or counterclockwise direction causes sequential operation of movable main contacts 3 and of movable auxiliary contacts 3.
  • the above referred-to lower grooved plate 5 for guiding the supports 30 for the movable contacts 3, 3' is substantially spider-shaped, i.e. it has arms 6 which extend radially outwardly and have radially outer ends engaging the radially inner surface of switch housing 1 and being secured to that surface of switch housing 1.
  • the upper grooved plate 4 and the lower grooved plate 5 are tied together by means of vertical ribs 7. Plates 4 and 5 and ribs 7 thus form a squirrel-cage frame supporting all the movable parts of the transfer switch structure.
  • This squirrel-cage frame structure may be at ground potential and form the neutral point of the electric system of which the transfer switch forms a part.
  • the spider-shaped plate or support 5 and the upper plate 4 are each provided with a roller bearing 12 for supporting main operating shaft 11.
  • Spider-shaped support 5 further defines a central upper bore 13 of relatively small diameter and a central lower internally screw-threaded bore 14 of relatively large diameter.
  • An externally screw-threaded hub member 19 is screwed into lower bore 14.
  • Hub-member 19 defines jointly with spider-shaped support 5 a circular groove to which reference character 20 has been applied.
  • Upper bore 13 in spider-shaped support 5 forms a bearing for an auxiliary shaft 15.
  • Shaft 15 is intended to operate movable current-carrying contacts and the provision of shaft 15 is optional and only necessary if the current-carrying capacity of the transfer switch is of such a magnitude as to require the provision of current-carrying contacts in addition to the main contacts 2, 3 and the auxiliary contacts 2', 3'.
  • Auxiliary shaft 15 may be driven by main operating shaft 11, both said shafts being arranged in coaxial relation.
  • the juxtaposed ends of both shafts are provided with an appropriate coupling, preferably a claw coupling.
  • Reference character 18 has been applied to indicate the lower end of main operating shaft 11 which forms one half of a claw coupling and reference character 17 has been applied to indicate the upper end of auxiliary shaft 15 which forms the other half of a claw coupling cooperatively engaging the lower part of main coupling shaft 11 for transmittal of torques from the latter to auxiliary shaft 15.
  • the aforementioned groove 20 is intended to receive an edge portion of a plate 22 having a central bore forming the edge portion of plate 22 to be received by groove 20.
  • plate 22 may be pivoted in clockwise as well as in counterclockwise direction about the central axis of the transfer switch structure which is the axis of cylindrical switch housing 1.
  • Plate 22 is a support for the movable main current-carrying contacts 16 which are in the form of rollers cooperating with the fixed main current-carrying contacts 25.
  • the lower end of auxiliary shaft 15 supports a driving disc 24 which may be keyed to auxiliary shaft 15, or otherwise secured to it in such a fashion as to be jointly pivotable with auxiliary shaft 15.
  • Driving disc 24 and plate-shaped contact support 22 are coupled for joint motion by stud means 23 spaced from, and arranged parallel to, main shaft 11 and auxiliary shaft 15. j
  • the fixed current-carrying contacts 25 are conductively connected to the fixed main contacts 2 and are supported on the inner surface of switch housing 1.
  • Reference numeral 21 has been applied to indicate brackets for securing movable current-carrying contacts 16 to contact support 22.
  • Such metals or alloys have a relatively limited current-carrying capacity and, therefore, the use of main contacts and of auxiliary contacts of relatively limited current-carrying capacity calls for the use of currentcarrying contacts. This may readily be achieved by adding to the structure of FIG. 2 a number of parts and thus converting it to the structure of FIG. 3.
  • the transfer switch which has been described above pertains to the class of transfer switches wherein the rotary motion of the main shaft 11 is converted by linkage means into radially inward and radially outward motions of the movable main contacts 3 and the movable auxiliary contacts 3' performed in a predetermined sequence, depending upon the particular circuitry of the transfer switch.
  • linkage means is used in this context to include the sum total of the parts applied in any particular case for converting the rotary motion of the main shaft into radial motions of the contact support 30, and of the movable contacts 3, 3, respectively.
  • the linkage means include shaft 31, linkages 8, shaft 32, contact operating plates 10 and helical springs 9.
  • the same functions performed by the specific linkage means recited above might be performed by structurally more or less different linkage means.
  • a transfer switch for tap-chan ing regulating transformers comprising in combination:
  • an auxiliary shaft for operating said movable current-carrying contacts separate from said main shaft and arranged in coaxial relation to said main shaft;
  • a transfer switch as specified in claim 3 wherein a driving disc is secured to the lower end of said auxiliary shaft and wherein said driving disc and said substantially plate-shaped contact support are coupled for joint motion by stud means spaced from and parallel to said main shaft and said auxiliary shaft.
  • a transfer switch as specified in claim 4 including movable current-carrying contacts in the form of rollers, said rollers being conductively interconnected to form the neutral point of atransformer.
  • a transfer switch as specified in claim 5 including a cylindrical switch housing of insulating material supporting said fixed main contacts, said fixed auxiliary contacts and further supporting fixed current-carrying contacts cooperating With said movable current-carrying contacts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Railway Tracks (AREA)
US542702A 1965-04-15 1966-04-13 Transfer switch for tap-changing transformers convertible for adaptation to a wide range of currents Expired - Lifetime US3360618A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM64893A DE1244947B (de) 1965-04-15 1965-04-15 Lastumschalter fuer Stufenschalter von Regeltransformatoren

Publications (1)

Publication Number Publication Date
US3360618A true US3360618A (en) 1967-12-26

Family

ID=7311261

Family Applications (1)

Application Number Title Priority Date Filing Date
US542702A Expired - Lifetime US3360618A (en) 1965-04-15 1966-04-13 Transfer switch for tap-changing transformers convertible for adaptation to a wide range of currents

Country Status (8)

Country Link
US (1) US3360618A (xx)
AT (1) AT259698B (xx)
BE (1) BE679593A (xx)
CH (1) CH435442A (xx)
DE (1) DE1244947B (xx)
GB (1) GB1097408A (xx)
NL (1) NL131072C (xx)
SE (1) SE311550B (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3806674A (en) * 1972-03-18 1974-04-23 Reinhausen Maschf Scheubeck Transfer swi ch operating mechanism for effecting tap changes
EP0106028A2 (en) * 1982-10-14 1984-04-25 Pennwalt Corporation Novel diuretic/antihypertensive compositions and methods of preparation
US20090211887A1 (en) * 2008-02-26 2009-08-27 Riming Xiao Moving contact head for tap switches
US20090211890A1 (en) * 2008-02-26 2009-08-27 Shanghai Huaming Power Equipment Co., Ltd. External hanging combined vacuum on-load tap switch

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811594A (en) * 1954-09-20 1957-10-29 Rca Corp Switch
US3238320A (en) * 1962-02-08 1966-03-01 Reinhausen Maschf Scheubeck Transfer switch for tap changers for regulating transformers including a cylindrical insulating housing, a squirrel-cage contact-supporting structure and contact bridgesinsulatingly supported by contact bridge carriers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1344702A (fr) * 1962-02-08 1963-11-29 Reinhausen Maschf Scheubeck Commutateur de charge pour interrupteur à étages de transformateurs de réglage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811594A (en) * 1954-09-20 1957-10-29 Rca Corp Switch
US3238320A (en) * 1962-02-08 1966-03-01 Reinhausen Maschf Scheubeck Transfer switch for tap changers for regulating transformers including a cylindrical insulating housing, a squirrel-cage contact-supporting structure and contact bridgesinsulatingly supported by contact bridge carriers

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3806674A (en) * 1972-03-18 1974-04-23 Reinhausen Maschf Scheubeck Transfer swi ch operating mechanism for effecting tap changes
EP0106028A2 (en) * 1982-10-14 1984-04-25 Pennwalt Corporation Novel diuretic/antihypertensive compositions and methods of preparation
EP0106028A3 (en) * 1982-10-14 1985-10-30 Pennwalt Corporation Novel diuretic/antihypertensive compositions and methods of preparation
US20090211887A1 (en) * 2008-02-26 2009-08-27 Riming Xiao Moving contact head for tap switches
US20090211890A1 (en) * 2008-02-26 2009-08-27 Shanghai Huaming Power Equipment Co., Ltd. External hanging combined vacuum on-load tap switch
US8153917B2 (en) * 2008-02-26 2012-04-10 Shanghai Huaming Power Equipment Co., Ltd. Moving contact head for tap switches

Also Published As

Publication number Publication date
NL6604946A (xx) 1966-10-17
SE311550B (xx) 1969-06-16
CH435442A (de) 1967-05-15
GB1097408A (en) 1968-01-03
AT259698B (de) 1968-01-25
BE679593A (xx) 1966-09-16
NL131072C (xx) 1970-11-16
DE1244947B (de) 1967-07-20

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