US3671687A - Transfer switch for tap-changing regulating transformers including lost motion interconnection driving mechanism - Google Patents

Transfer switch for tap-changing regulating transformers including lost motion interconnection driving mechanism Download PDF

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Publication number
US3671687A
US3671687A US95428A US3671687DA US3671687A US 3671687 A US3671687 A US 3671687A US 95428 A US95428 A US 95428A US 3671687D A US3671687D A US 3671687DA US 3671687 A US3671687 A US 3671687A
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United States
Prior art keywords
contacts
contact
pairs
fixed
pair
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Expired - Lifetime
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US95428A
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English (en)
Inventor
Alexander Bleibtreu
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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Priority claimed from DE19691962958 external-priority patent/DE1962958C/de
Application filed by Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
Application granted granted Critical
Publication of US3671687A publication Critical patent/US3671687A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

  • Tap-changing regulating transformers include three basic elements, Le. a tapped transformer winding, a selector switch for selecting any desired tap on said winding, and a transfer switch for connecting a load to the particular tap selected by the selector switch.
  • This invention relates to improved transfer switches, and more particularly to transfer switches of the type known as Jansen type transfer switches.
  • FIG. 4 of the first mentioned patent shows a circuit diagram including a tapped transformer winding, a selector switch and a transfer switch and the coaction of these three elements is described in the context of FIG. 4.
  • the last mentioned patent shows in FIGS. 1,2 and 3 thereof various circuit connections of transfer switches which are described in detail in the context of FIGS. 1-3.
  • FIG. 9 of U.S. Pat. No. 3,238,320 shows and its context describes the operation of the main contacts and the auxiliary contacts in a transfer switch of the Jansen type
  • FIG. 12 of that patent shows in what fashion current-carrying contacts may be added to the main contacts and the auxiliary contacts in a transfer switch of the Jansen type.
  • the con text of FIG. 12 describes in detail the function of the current carrying contacts, and the way in which such contacts may be operated.
  • the present invention refers to a transfer switch wherein large gaps between the separated current-carrying contacts can be achieved by extremely simple and inexpensive operating means for the latter.
  • a transfer switch for tap-changing regulating transformers embodying this invention includes a substantially cylindrical contact support of insulating material.
  • a plurality of fixed contacts supported by said contact support are arranged in a circular pattern.
  • Said plurality of fixed contacts includes fixed main contacts, fixed auxiliary contacts arranged between said fixed main contacts, and fixed current-carrying contacts each arranged adjacentone of said fixed main contacts on the side thereof opposite to one of said fixed auxiliary contacts.
  • the transfer switch is further provided with aplurality of movable contacts each arranged to selectively engage one of said plurality of fixed contacts, and to be-separated from said one of said plurality of fixed contacts.
  • the aforementioned plurality of movable contacts includes movable main contacts each arranged to cooperate with one of said fixed main contacts, movable auxiliary contacts each arranged to cooperate with one of said fixed auxiliary contacts, and movable current-carrying contacts each arranged to cooperate with one of said fixed current-carrying contacts.
  • Each of said movable currentcarrying contacts has a lateral projection extending toward one of the movable main contacts immediately adjacent thereto.
  • A. drive shaft selectively pivotable in opposite directions for operating said plurality of movable contacts is arranged along the axis of said contact support.
  • Transfer switches embodying this invention further include a plurality of contact-operating links.
  • Each of these contact-operating links has a radially inner pivot pin jointly pivotable with said drive shaft, and a radially outer pivot pinaffixed to one of said plurality of movable contacts.
  • the radially outer pivot pin affixed to each of said movable main contacts projects through said lateral projection of one of said movable current-carrying contacts and hingedly supports said one of said movable current-carrying contacts on said one of said movable main contacts.
  • FIG. 1 is a vertical section of a transfer switch embodying the present invention taken along 1-1 of FIG. 3 with portions of the contact-operating links broken away in order not to encumber FIG. 1;
  • FIG. 2 is avertical section of the structure of FIG. 1 taken along "-11 of FIG. 1;
  • FIG. 3 is a top plan view of the structure of FIGS. 1 and 2;
  • FIG. 4 shows a-portion of the structure of FIG. 3 in the same fashion as FIG. 3 but in another operating position.
  • the transfer switch includes a substantially cylindrical contact support 10 of insulating material supporting a plurality of fixed contacts 11,12,13,l4 arranged in a circular pattern, or in the form of a sectorof a circle. in order to establish double breaks contacts '1 1,12,13,14 are arranged at two different levels, and form two circular coaxial patterns.
  • the transfer switch further includes a plurality of movable contacts 21,22,23 and 34.
  • Fixed contacts 11,12 are main contacts and movable contacts 21,22 are cooperating main contacts each arranged to selectively engage one of fixed rnain contacts 11,12 and to beseparated from said oneof fixed main contacts 11,12.
  • Fixed contacts 13 areauxiliary contacts and are arrangedbetween fixed main contacts 11,12. Fixed auxiliary contacts 13 cooperate with movable auxiliary contacts 23,
  • Fixed contacts 14 are current-carrying contacts. Each fixed current-carrying contact 14 is arranged adjacent one fixed main contact 11, 12 on the side thereof opposite to onefixed auxiliary contact 13 immediately adjacent thereto. Fixed current-carrying contacts 14 cooperate with movable current-carrying contacts 34. Each of'the latter is arranged to selectively engage one of the fixed current-carrying contacts 14, and to be separated from said one of the fixed current-carrying contacts 14.
  • the function of a cooperating pair of current-carrying contacts is to carry current after engagement of a cooperating pair of main contacts arranged in the same current path, and thus to relieve the pair of main contacts of their current-carrying duty during the time of engagement thereof.
  • the low resistance current-carrying contacts shunt the high resistance main contacts which are arranged in the same current path. Since current-carrying contacts are designed to, and capable of, carrying currents, but not capable of breaking currents, or to withstand arcing, the current-carrying contacts must be separated before the main contacts arranged in the same current path are separated. How this is achieved in the instant case will be shown below in detail.
  • the movable main contacts 21,22 and the movable contacts 23 have upper and lower projections engaging radially extending grooves 24 in a pair of end plates 25 arranged at right angles to the axis of cylindrical contact support 10.
  • each movable main contact 21,22 and each movable auxiliary contact 23 is guided along a straight path or trajectory, defined by a pair of radially extending grooves 24 in end plates 25.
  • the fixed main contacts 11,12 and the fixed auxiliary contacts 13 are aupported on support by contact supporting studs which project transversely through support 10 as clearly shown in FIGS. 1,3 and 4.
  • Helical spring means are interposed between each fixed contact 11,12,l3,14 and support 10 to cushion contacts 11,12,13,14.
  • Each of the movable currentcarrying contacts 34 is provided with a lateral projection 35 extending toward the movable main contact 21 immediately adjacent thereto.
  • Reference numeral 26 has been applied to indicate a plurality of links for operating the movable main contacts 21,22 and for operating the movable auxiliary contacts 23, and reference numeral 38 has been applied to indicate a pair of links for operating movable current-carrying contacts 34.
  • Each movable main contact 21, 22 and each movable auxiliary contact 23 is provided with a pair of operating links 26 which are arranged at different levels.
  • FIG. 1 the two level arrangement of operating links 26 has been clearly shown. In that figure the radially outer ends of links 26 are shown as being broken away.
  • FIG. 2 shows in part a pair of superimposed links 26 for operating movable main contact 21 which cooperates with fixed main contact 11.
  • a Y-shaped drive shaft 28 selectively pivotable in opposite directions is arranged along the axis of contact support 10.
  • Drive shaft 28 is provided with a pair of axially spaced hub members or contact-operating members 27 which pivot in clockwise and counter-clockwise direction jointly with drive shaft 28.
  • Each contact operating link 26 is provided with a radially inner pivot pin 29 supported and operated by one of members 27, and hence jointly movable with shaft 28.
  • each contact-operating member 27 is provided with three radially extending slots 30 which are angularly displaced 120 degrees.
  • Each of slots 30 is a means for operating the movable main contacts 21,22 and the movable 5 auxiliary contacts 23 pertaining to one phase of a three phase circuit.
  • All upper level links 26 pertaining to one phase have a common pivot pin 29 arranged in the radial slot 30 of the upper level contact-operating member 27, and all lower level links 26 pertaining to one phase have a common pivot pin 29 arranged in a radial slot 30 of the lower level contact-operat ing member 27.
  • Each slot 30 receives in addition to a pivot pin 29 a helical spring 31 biasing the adjacent pivot pin radially outwardly away from the axis of contact support 10.
  • Each contact-operating link 26 is provided with a radially outer pivot pin 36 affixed to a movable main contact 21,22, or to a movable auxiliary contact 23, respectively.
  • Reference character 40 has been applied to indicate a third hub-member, or contact-operating member, fixedly mounted on Y-shaped drive shaft 28 between hub-members of contact operating members 27 and jointly pivotable with shaft 28.
  • Hub member 40 is provided with bearings for pivot pins which are arranged in the general vertical planes defined by slots 30 in hub members 27, but which are arranged more remotely from the axis of shaft 28 than slots 30, or radially outwardly from slots 30.
  • Each movable current-carrying contact 34 is operated by a link 38 having a radially outer pivot pin 37 affixed to one of movable current-carrying contacts 34 and haw ing a radially inner pivot pin 39 arranged in the pin bearing formed by contact-operating member 40.
  • Pivot pin 39 is common to the operating links 38 of both movable current-carrying contacts 34. Since the radial spacing of pivot pin 39 from the axis of shaft 28 exceeds the radial spacing of pivot pins 29 from the axis of shaft 28, the velocity of pivot pin 39 exceeds the velocity of pivot pins 29 when shaft 28 is being pivoted in either direction by motor means not shown.
  • the radially outer pivot pins 37 of links 38 are affixed to, or supported by, movable current-carrying contacts 34.
  • Movable current-carrying contacts 34 have contact surfaces which are substantially circular in cross-section, i.e., these contact surfaces are substantially cylindrical.
  • the contact surfaces of movable currentcarrying contacts 34 are arranged in coaxial relation to the radially outer pivot pins 37 of contact-operating links 38.
  • the contact surfaces of the fixed current-carrying contacts 14 are planar.
  • the lateral projections 35 of movable current-carrying contacts are pivotally connected to movable main contacts 21, 22 by means of pivot pins 36 extending across projections 35 as well as across the radially outer ends of operating links 26 for movable main contacts 21,22.
  • FIGS. 1-4 The operation of a transfer switch embodying this invention shown in FIGS. 1-4 is as follows:
  • main contacts 11,21 remain in engagement on account of the fact that pins 29 move during this period of time relative to parts 27 from their radially outer position in slots 30 to their radially inner position in slots 30 so that no radial inward motion is imparted to pins 29 and to operating links 26 of movable main contacts 21,22.
  • the pin-receiving slots 30 operate as a lost motion connection delaying the separation of contacts 1 1,21 following initiation of the pivotal motion of drive shaft 28.
  • the main contacts 11,21 remain closed until after engagement of the first pair of cooperating auxiliary contacts 13,23 immediately adjacent to cooperating main contacts 11,21.
  • FIG. 3 shows one limit position of contacts 34,21
  • FIG. 4 shows their other limit position in which contact 34 is entirely separated from contact 14 and contact 21 is fully separated from contact 11. It is apparent from FIG. 4 that the length of the ultimate gap between current-carrying contacts 14,34 by far exceeds the length of the ultimate gap between main contacts 11,21.
  • the main contacts 11,21 and 12, 22 are arcing contacts and are, therefore, subject to contact erosion. Their erosion has,however, no effect upon the initial movement of separation of current-carrying contacts 34 from current-carrying contacts 14 because the erosion of contacts l1,l2,21,22 has no effect on the spacing between the axis of shaft 28 and the point of engagement of current-carrying contacts 14,34.
  • a transfer switch for tap-changing regulating transformers including a. a substantially cylindrical contact support of insulating material;
  • a plurality of pairs of fixed contacts supported by said contact support and arranged in a circular pattern, the constituent contacts of each of said plurality of pairs of contacts being spaced in a direction longitudinally of the axis of said contact support, said plurality of pairs of fixed contacts including pairs of fixed main contacts, pairs of fixed auxiliary contacts arranged between said pairs of fixed main contacts, and pairs of fixed current-carrying contacts each arranged adjacent one of said pairs of fixed main contacts on the side thereof opposite to one pair of said pairs of fixed auxiliary contacts;
  • a plurality of movable contact bridges each arranged to selectively engage one of said plurality of pairs of fixed contacts and to be separated from said one of said plurality of pairs of fixed contacts, said plurality of contact bridges including main contact bridges each arranged to cooperate with one pair of said pairs of fixed main contacts, auxiliary contact bridges each arranged to cooperate with one pair of said pairs of fixed auxiliary contacts, and current-carrying contact bridges each arranged to cooperate with one pair of said pairs of fixed current-carrying contacts, each of said current-carrying contact bridges having a pair of lateral projections spaced in a direction longitudinally of said axis of said contact support and extending toward one of said main contact bridges immediately adjacent thereto;
  • a plurality of contact-operating link means each having a radially inner pivot pin jointly pivotable with said drive shaft and a radially outer pivot pin affixed to one of said plurality of contact bridges, and said radially outer pivot pin afiixed to each of said main contact bridges projecting through said pair of lateral projections of one of said current-carrying contact bridges and hingedly supporting said one of said current-carrying contact bridges on said one of said main contact bridges.
  • a transfer switch as specified in claim 1 wherein said drive shaft includes a contact-operating member defining a bearing arranged relatively remote from the axis of said drive shaft for said radially inner pivot pin of said contact-operating link means of said current-carrying contact bridges,and wherein said drive shaft includes an additional contact-operating member defining a radially extending slot relatively close. to the axis of said drive shaft receiving said radially inner pivot pin of said contact-operating link means of said main contact bridges and of said auxiliary contact bridges and further receiving a helical biasing spring biasing said radially inner pivot pin of said contact-operating link means of said main contact bridges and of said auxiliary contact bridges away from the axis of said drive shaft.
  • a transfer switch for tap-changing regulating transformer including a plurality of pairs of fixed spaced contacts arranged in a sector of a circle pattern, said plurality of pairs of fixed contacts including pairs of fixed main contacts, pairs of fixed auxiliary contacts arranged between said pairs of fixed main contacts, and pairs of fixed current-carrying contacts each arranged adjacent to one pair of said pairs of fixed main contacts on the side thereof opposite to one pair of said pairs of fixed auxiliary contacts;
  • a plurality of movable main contact bridges and movable auxiliary contact bridges each arranged to selectively engage one pair of said pairs of fixed main contacts or one pair of said pairs of fixed auxiliary contacts and each pivotally connected to one pair of pairs of spaced contact-operating links;
  • a pivotable drive shaft arranged in the center of said sector of a circle pattern at right angles to the planes defined by said said plurality of pairs of fixed contacts;
  • a pair of joint pivot means on the end of each of said pairs of contact-operating links of each of said plurality of main contact bridges and auxiliary contact bridges remote from main contact bridges and said auxiliary contact bridges operated by said drive shaft by the intermediary of a pair of lost motion connections each having a radially outer end and each being interposed between said drive shaft and said pair of joint pivot means;
  • a pair of movable current-carrying contact bridges each cooperating with one pair of said pairs of fixed currentcarrying contacts, each hingedly supported by one of said main contact bridges, and each pivotally connected to a pair of contact-operating links;
  • pivot means on one end of said pair of contact-operating links of each said pair of current-carrying contact bridges operated by said drive shaft, said pivot means being connected to said drive shaft at a point spaced farther away from the axis of said drive shaft than said radially outer end of said pair of lost motion connections.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US95428A 1969-12-16 1970-12-07 Transfer switch for tap-changing regulating transformers including lost motion interconnection driving mechanism Expired - Lifetime US3671687A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691962958 DE1962958C (de) 1969-12-16 Lastumschalter für Stufenschalter von Regeltransformatoren

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US3671687A true US3671687A (en) 1972-06-20

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US95428A Expired - Lifetime US3671687A (en) 1969-12-16 1970-12-07 Transfer switch for tap-changing regulating transformers including lost motion interconnection driving mechanism

Country Status (6)

Country Link
US (1) US3671687A (de)
JP (1) JPS524728B1 (de)
AT (1) AT301699B (de)
FR (1) FR2073183A5 (de)
GB (1) GB1287669A (de)
SE (1) SE366145B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090166162A1 (en) * 2007-12-27 2009-07-02 Larsen & Toubro Limited Contact Actuating Mechanism for Switching Device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2213264C2 (de) * 1972-03-18 1974-03-28 Maschinenfabrik Reinhausen Gebrueder Scheubeck Kg, 8400 Regensburg Lastumschalter für Stufentransformatoren
JPS53103638U (de) * 1977-01-24 1978-08-21
DE2747489C3 (de) * 1977-10-22 1982-01-21 Maschinenfabrik Reinhausen Gebrüder Scheubeck GmbH & Co KG, 8400 Regensburg Lastumschalter für Stufenschalter von Stufentransformatoren
DE4016428C1 (de) * 1990-05-22 1991-11-07 Maschinenfabrik Reinhausen Gmbh, 8400 Regensburg, De

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT239929B (de) * 1962-02-08 1965-05-10 Reinhausen Maschf Scheubeck Lastumschalter
US3238318A (en) * 1963-05-17 1966-03-01 Reinhausen Maschf Scheubeck Contact bridges for radial contacts with fulcrum and resilient spring structure
US3250865A (en) * 1963-07-18 1966-05-10 Reinhausen Maschf Scheubeck Transfer switch for tapped regulating transformers with radial guide and linkage structure
DE1221355B (de) * 1961-01-05 1966-07-21 Circulume Ltd Als Vorschaltgeraet fuer Gasentladungslampen bestimmte ringfoermige Drosselspule
DE1221354B (de) * 1962-08-20 1966-07-21 Licentia Gmbh Lastumschalter fuer Stufentransformatoren

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1221355B (de) * 1961-01-05 1966-07-21 Circulume Ltd Als Vorschaltgeraet fuer Gasentladungslampen bestimmte ringfoermige Drosselspule
AT239929B (de) * 1962-02-08 1965-05-10 Reinhausen Maschf Scheubeck Lastumschalter
DE1221354B (de) * 1962-08-20 1966-07-21 Licentia Gmbh Lastumschalter fuer Stufentransformatoren
US3238318A (en) * 1963-05-17 1966-03-01 Reinhausen Maschf Scheubeck Contact bridges for radial contacts with fulcrum and resilient spring structure
US3250865A (en) * 1963-07-18 1966-05-10 Reinhausen Maschf Scheubeck Transfer switch for tapped regulating transformers with radial guide and linkage structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090166162A1 (en) * 2007-12-27 2009-07-02 Larsen & Toubro Limited Contact Actuating Mechanism for Switching Device
US8076600B2 (en) * 2007-12-27 2011-12-13 Larsen & Toubro Limited Contact actuating mechanism for switching device

Also Published As

Publication number Publication date
GB1287669A (en) 1972-09-06
SE366145B (de) 1974-04-08
DE1962958A1 (de) 1971-06-24
JPS524728B1 (de) 1977-02-07
FR2073183A5 (fr) 1971-09-24
AT301699B (de) 1972-09-11
DE1962958B2 (de) 1971-11-18

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