US3806674A - Transfer swi ch operating mechanism for effecting tap changes - Google Patents

Transfer swi ch operating mechanism for effecting tap changes Download PDF

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Publication number
US3806674A
US3806674A US00341310A US34131073A US3806674A US 3806674 A US3806674 A US 3806674A US 00341310 A US00341310 A US 00341310A US 34131073 A US34131073 A US 34131073A US 3806674 A US3806674 A US 3806674A
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United States
Prior art keywords
contacts
fixed
pair
circle
contact
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Expired - Lifetime
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US00341310A
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English (en)
Inventor
J Schaller
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.)
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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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

  • ABSTRACT A transfer switch including, in addition to main contacts, auxiliary contacts and current-carrying contacts, fixed terminals having current-carrying contact means.
  • Special switching means allow selective interconnection of the fixed current-carrying contacts with current-carrying contact means of the fixed terminals.
  • the movable main contacts, the movable auxiliary contacts, and the aforementioned special switching means are all operated by cam means, or a cam disc.
  • Tap-changing regulating transformers include three units, namely the transformer proper having a tapped winding, selector switches for selecting desired taps of the winding, and transfer switches for transferring the load from one selected tap to another.
  • the movable contacts of transfer switches may be operated by various means as, for instance, linkages, or cams.
  • the present invention relates to transfer switches whose movable contacts are operated by cams rather than by linkages or toggles.
  • Transfer switches include pairs of relatively movable main contacts.
  • main contacts is used in reference to contacts which are intended to interconnect, and interconnect, a tap of a tapped transformer winding directly with the terminal of an outgoing line, or load circuit.
  • directly as used in this context means without interposition of switching resistors, or switch-over resistors.
  • Transfer switches further'include pairs of relatively movable auxiliary contacts.
  • auxiliary contact is used in reference to contacts which are intended to interconnect, and interconnect, a tap of a tapped transformer winding with the terminal of an outgoing line, or load circuit, by the intermediary of switching resistors or switch-over resistors.
  • a third kind of contacts occurring in transfer switches as well as in many other switches and circuit breakers are current-carrying contacts. Such contacts are designed to carry high load currents with very small losses, but are incapable of opening or closing live circuits.
  • Current-carrying contacts of transfer switches interconnect directly, i.e. without interposition of a resistor, a tap of a tapped transformer winding with the terminal of an outgoing line, or'load circuit.
  • Currentcarrying contacts provide minimal resistance shunts across pairs of engaging main contacts.
  • the present invention refers to transfer switches including auxiliary contacts, main contacts and currentcarrying contacts, and more particularly transfer switches wherein these contacts are operated by cam means rather than'linkages, or toggles, and which are designed to cooperate with tapped polyphase or threephase transformers.
  • transfer switches the fixed contacts are generally arranged at points of a cylindrical surface, and this applies also to transfer switches embodying the present invention.
  • the principal object of theinvention is to provide transfer switches of the above description whose bulk is minimized, i.e. which are extremely compact.
  • a related object of this invention is to provide transfer switches of the above description allowing to greatly simplify the geometry of their various current-paths.
  • Still another related object of this invention is to provide transfer switches of the above description whose current-carrying contacts may be, or are, positioned immediately adjacent, or very close, to the main contacts and to the auxiliary contacts.
  • a plurality of pairs of relatively movable auxiliary contacts including fixed auxiliary contacts arranged in a pattern that is a sector of a circle.
  • Aplurality of pairs of relatively movable main contacts including fixed main contacts arranged in said pattern of a sector of a circle peripherally outside the region of said sector occupied by said fixed auxiliary contacts.
  • Cam means driven by a shaft arranged in the center of said circle for operating said relatively movable auxiliary contacts and said-relatively movable main contacts.
  • a pair of fixed substantially U-shaped terminals arranged on another circle of relatively small diameter concentric to said circle, each of said pair of fixed terminals being arranged outside the angular area defined by said center of a circle and said fixed main contacts and on opposite sides of said area, and each of said pair of fixed substantially U-shaped terminals supporting a pair of terminal contacts on the flange portions thereof.
  • a pair of contact bridges for selectively connecting one fixed current-carrying contact of said two pairs of fixed current-carrying contacts and one terminal contact of said pair of terminal contacts of said pair of terminals.
  • Operating means including cam means driven by said shaft for operating said pair of contact bridges.
  • FIG. 1 shows a sector of a three-phase transfer switch embodying this invention which transfer switch includes three sectors as shown in FIG. 1, FIG. 1 being in essence a top plan view of the transfer switch, some of its parts having been removed to better expose other parts thereof; and
  • FIG. 2 is a vertical section of the structure shown in FIG. 1 taken along II-II of FIG. 1 and being drawn on a smaller scale than FIG. 1.
  • FIG. 1 DESCRIPTION OF PREFERRED EMBODIMENTS
  • reference characters VS, US and WS have been applied to indicate the three sectors included in a three-phase transformer switch.
  • Sectors VS and WS have been indicated but diagrammatically in FIG. 1, and sector US has been shown in considerable detail.
  • Sectors VS and WS are constructed in the same way as sector US.
  • FIG. 1 The structure of FIG. 1 includes movable main contactsl, 4 and movable auxiliary contacts 2, 3.
  • the aforementioned movable contacts 1, 2, 3, 4 are operated by cam-controlled rods 9, i.e. these contacts are moved either radially outwardly, or radially inwardly, by means of cam-controlled rods 9.
  • Reference characters 5 and 8 have been applied to indicate fixed main contacts cooperating with movable main contacts 1 and 4, and reference characters 6 and 7 have been applied to indicate fixed auxiliary contacts cooperating with movable auxiliary contacts 2 and 3.
  • the ends of rods 9 remote from contacts 1, 2, 3, 4 are provided with pins engaging slots 10 in cam disk 11. The latteris pivotable by means of shaft 12 arranged in the center thereof.
  • Shaft 12 is adapted to be pivoted by motor means (not shown) selectively either in clockwise direction or in counterclockwise direction.
  • Cam disk 11 pivots jointly with shaft 12 and this causes rods 9 to move contacts 1, 2, 3, 4 radially outwardly and radially inwardly in the required predetermined sequence.
  • Reference characters D, and D have been applied to generally designate current-carrying contact means, i.e. contact means capable of carrying a load current continuously but not capable of performing any switching operations underv load.
  • the current-carrying contact means D includes the fixed current-carrying contacts U, and W,, the fixed current-carrying terminal 14 and the current-carrying bridge 13 which conductively interconnectsparts U, and 14 in the position of the switch mechanism shown in FIG. 1. In that position movable main contact 1 engages fixed main contact 5 and contacts 2, 3, 4 are out of engagement with contacts 6, 7, 8.
  • the fixed current-carrying contact W pertains in terms of operation to sector WS rather than sector US.
  • the current-carrying contact means D include the fixed current-carrying contacts U V,, the fixed current-carrying terminal 15 and the currentcarrying bridge 16 which conductively interconnects parts V, and 15 in the position of the switch mechanism shown in FIG. 1.
  • the fixed current-carrying contact V pertains in terms of operation to the sector VS rather than sector US of the polyphase switch mechanism.
  • the fixed current-carrying contacts U,, U V,, W, are arranged along a circle with drive shaft 12 as its center and having a relatively large radius. The channel-.
  • shaped current-carrying terminals 14, 15 are arranged along another circle with drive shaft 12 as its center end having a relatively small radius.
  • the contact bridge 13 is adapted to conductively connect selectively either contact U, and contact 14 on a flange portion of channel-shaped current-carrying terminal 14, or contact W and contact 142 on a flange portion of channel-shaped current-carrying terminal 14.
  • contact bridge 16 is adapted to conductively connect selectively either contact V, and contact 151 on a flange of channel-shaped current-carrying terminal 15, or contact'U and contact 152 on a flange of channelshaped current-carrying terminal contact 15.
  • Currentcarrying contact bridge 13 is supported by a two armed lever 17 pivotally supported at 19 by current-carrying terminal 14 and provided with a roller 171 adapted to engage a cam-forming recess or cut-out 21 in cam plate 1 1.
  • current-carrying contact bridge 16 is supported by a lever 18 having two arms pivotally supported at 20 by current-carrying terminal 15 and provided with a roller 181 adapted to engage a camforming recess or cut-out 22 in cam plate 11.
  • Reference numerals 211 and 221 have been applied to indicate short cam sections on cam plate 11 immediately adjacent recesses 21 and 22, respectively.
  • Cam plate 11 may also be provided with cam means 213, 214 to both sides of recess 21 and cam means 223, 224 to both sides of recess 22. The object of these various cam means will become more fully apparent from what follows below.
  • reference character 45 has been applied to indicate supporting insulators which supports currentcarrying contacts V,, U
  • the supporting insulators 45 are on the other hand fixed on a contact supporting segment 31 of insulating material together with terminals 15.
  • This contact supporting segment 31 supports also the fixed main contacts 5, which are operating together with the movable main contact 1.
  • the movable main contact 1 is operated by rods 9 and connecting rods 42, said connection rods 42 are hinged together by a bridge 44 which is driven by tension springs 43.
  • Such a tapchanging operation involves a counterclockwise pivotal motion of shaft 12 which is Y-shaped in cross-section and results in a like pivotal motion of cam plate 11.
  • rollers 171, 181 which were heretofore resting against cam surfaces 211, 221 of cam disc 11 are caused to engage recesses 21, 22 of cam disc 11. This causes a pivotal motion of lever 17 about pivot 19 in clockwise direction, and a pivotal motion of lever 18 about pivot 20 in clockwise direction.
  • fixed auxiliary contacts 6, 7 cooperating with the movable auxiliary contacts 2, 3 are arranged in a pattern-that is a sector of a circle, the center of which is the center of shaft 12.
  • the fixed main contacts 5, 8 cooperating with the movable main contacts 1, 4 are likewise arranged in a pattern which is a sector of a circle, the center of which is the center of'shaft 12.
  • Fixed main contacts 5, 8 are arranged peripherally outside the region of the sector of a circle occupied by auxiliary fixed contacts 6, 7.
  • Shaft 12 operates cam means 11, 10 for operating contacts 2, 3, 1, 4.
  • Reference characters U W have been applied to indicate a first pair of fixed currentcarrying' contacts arranged on another circle than contacts 5, 6, 7, 8.
  • the circle on which contacts U W are arranged and the circle on which contacts 5, 6, 7, 8 are arranged are concentric.
  • Reference characters U V have been applied to indicate a second pair of fixed current-carrying contacts arranged on the same circle as the aforementioned first pair of fixed currentcarrying contacts.
  • Contacts U W and contacts U V are arranged outside of the angular area defined by the center of the circle on which they are arranged and by fixed main contacts 5, 8.
  • Contacts U W and contacts U V are arranged on opposite sides of that area.
  • the pair of fixed terminals 1 4, is arranged on another circle concentric with the aforementioned circles, but having a relatively small diameter.
  • Each of terminals 14, 15 is'arranged outside the angular area defined by the center of shaft 12 and fixed main contacts 5, 8.
  • Fixed terminals 14, 15 are substantially U-shaped, and the flange portions thereof support current-carrying contacts 141, 142 and 151, 152, respectively.
  • the pair of contact bridges 13, 16 are supported by two-armed levers 17, 18 which are pivoted at 19 and 20, respectively.
  • Each contact bridge 13, 16 is formed by a pair of contacts which are' biased in opposite directions by interposed helical springs, but maintained in certain limit positions by abutments supported by, or forming part of, levers 17, 18. This has been clearly shown in FIG. 1.
  • Contact bridge 13 can selectively interconnect contacts U and 141 (as shown in FIG. 1), or contacts W and 142.
  • Contact bridge 16 can selectively interconnect contacts V, and 151 (as shown in FIG. 1), or contacts U and 152. This depends upon the position of shaft 12 and cam disc 11.
  • Cam disc 11 and the camforming slots 21, 22 therein are the means for operating or actuating levers 17, 18 and contact bridges 13, 16.
  • a tap-changing transfer switch for tapped regulating transformers comprising a. a plurality of pairs of relatively movable auxiliary contacts including fixed auxiliary contacts arranged in a pattern that is a sector of a-circle;
  • cam means driven by a pivotable shaft arranged in the center of said circle for operating said relatively movable auxiliary contacts and said relatively movable main contacts;
  • each of said pair of fixed terminals being arranged outside the angular area defined by said center of a circle and said fixed main contacts and on opposite sides of said area, and each of said pair of substantially U- shaped fixed terminals supporting a pair of terminal contacts on the flange portions thereof;
  • a pair of contact bridges for selectively connecting one fixed current-carrying contact of said two pairs of fixed current-carrying contacts and one terminal contact of said pair of terminal contacts of said pair of terminals;
  • operating means including cam means driven by said shaft for operating said pair of contact bridges.
  • a switch as specified in claim 1 wherein a. said cam means for operating said relatively movable auxiliary contacts and said relatively movable main contacts are formed by a disc mounted on said shaft and having a plurality of contactoperating cam surfaces; and wherein b. said operating means for operating said pair of contact bridges include a pair of two-armed levers pivotably supported between the ends thereof, supporting said contact bridges on one of the ends thereof and being driven at the other of the ends thereof by cam surfaces formed by said disc.

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  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US00341310A 1972-03-18 1973-03-14 Transfer swi ch operating mechanism for effecting tap changes Expired - Lifetime US3806674A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2213264 1972-03-18

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US3806674A true US3806674A (en) 1974-04-23

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Application Number Title Priority Date Filing Date
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Country Status (8)

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US (1) US3806674A (fr)
JP (1) JPS5244405B2 (fr)
AT (1) AT320802B (fr)
BE (1) BE796908A (fr)
CH (1) CH545533A (fr)
DE (1) DE2213264C2 (fr)
FR (1) FR2176778B1 (fr)
SE (1) SE375643B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902030A (en) * 1973-08-31 1975-08-26 Laurentiv Popa Diverter switch for on-load changers
US4348558A (en) * 1979-01-05 1982-09-07 Asea Aktiebolag Diverter switch for an on-load transformer tap changer
US7124302B2 (en) 1995-02-13 2006-10-17 Intertrust Technologies Corp. Systems and methods for secure transaction management and electronic rights protection

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS608480A (ja) * 1983-06-27 1985-01-17 Arubatsuku Kuraio Kk クライオポンプの再生方法
DE3326549A1 (de) * 1983-07-22 1985-02-07 Transformatoren Union Ag, 7000 Stuttgart Lastwaehler fuer stufentransformatoren
DE102011119318B4 (de) * 2011-11-23 2014-11-27 Maschinenfabrik Reinhausen Gmbh Stufenschalter mit Vakuumschaltröhren

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3360618A (en) * 1965-04-15 1967-12-26 Reinhausen Maschf Scheubeck Transfer switch for tap-changing transformers convertible for adaptation to a wide range of currents
US3632908A (en) * 1969-06-18 1972-01-04 Reinhausen Maschf Scheubeck Regulating transformer tap-changer switch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671687A (en) * 1969-12-16 1972-06-20 Reinhausen Maschf Scheubeck Transfer switch for tap-changing regulating transformers including lost motion interconnection driving mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3360618A (en) * 1965-04-15 1967-12-26 Reinhausen Maschf Scheubeck Transfer switch for tap-changing transformers convertible for adaptation to a wide range of currents
US3632908A (en) * 1969-06-18 1972-01-04 Reinhausen Maschf Scheubeck Regulating transformer tap-changer switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902030A (en) * 1973-08-31 1975-08-26 Laurentiv Popa Diverter switch for on-load changers
US4348558A (en) * 1979-01-05 1982-09-07 Asea Aktiebolag Diverter switch for an on-load transformer tap changer
US7124302B2 (en) 1995-02-13 2006-10-17 Intertrust Technologies Corp. Systems and methods for secure transaction management and electronic rights protection

Also Published As

Publication number Publication date
FR2176778A1 (fr) 1973-11-02
JPS4912320A (fr) 1974-02-02
DE2213264B1 (de) 1973-09-06
BE796908A (fr) 1973-07-16
JPS5244405B2 (fr) 1977-11-08
SE375643B (fr) 1975-04-21
DE2213264C2 (de) 1974-03-28
AT320802B (de) 1975-02-25
FR2176778B1 (fr) 1976-11-05
CH545533A (fr) 1974-01-31

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