US3396254A - Arrangement for avoiding eddy current losses in transfer switch and selector switch units with interposed gear drive - Google Patents

Arrangement for avoiding eddy current losses in transfer switch and selector switch units with interposed gear drive Download PDF

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Publication number
US3396254A
US3396254A US554436A US55443666A US3396254A US 3396254 A US3396254 A US 3396254A US 554436 A US554436 A US 554436A US 55443666 A US55443666 A US 55443666A US 3396254 A US3396254 A US 3396254A
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United States
Prior art keywords
selector switch
switch
transfer switch
selector
gear drive
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Expired - Lifetime
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US554436A
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English (en)
Inventor
Bleibtreu Alexander
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 RHEINHAUSEN Gebr SCHEUBECK K G
RHEINHAUSEN Gebr SCHEUBECK
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RHEINHAUSEN Gebr SCHEUBECK
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips

Definitions

  • This invention relates to load-tap changers for regulating transformers, and it relates more particularly to a type of load-tap changers which is known as J ansentype loadtap changers.
  • Load-tap changers include selector switches and transfer switches and drive means for operating these two kinds of switches.
  • Selector switches serve the purpose of selecing any desired tap along a tapped transformer winding intended to be connected into an electric circuit.
  • Selector switches are not required to interrupt current-carrying circuits, or to close on current-carrying circuits.
  • the taps of tapped transformer windings are conductively connected to the selector switches.
  • the selector switches are, in turn, conductively connected to the transfer switches.
  • the particular geometry of selector switches and of transfer switches depends largely upon whether it is intended to integrate polyphase switching means into one sing-1e unitary structure, or to resort to single-phase switches operating, as required, in single-phase circuits, or certain polyphase circuits as, for instance, three-phase circuits of delta connected transformers. This invention is concerned with single-phase switching.
  • a widely used and preferred design of a single-phase tap-changing means, or single-phase tap-changers includes a selector switch arranged at a relatively low level, and a transfer switch operatively related to the selector switch and arranged at a level above the selector switch, and a gear drive for the selector switch interposed between the selector switch and the transfer switch, the selector switch, the transfer switch and the aforementioned gear drive for the former being integrated to form a unitary structure.
  • the latter is placed into the tank of a tapped oil-insulated transformer with which it is intended to be operatively re lated, and submersed in the body of oil contained in that tank.
  • This invention relates more particularly to units of the aforementioned description, and it is a general object of this invention to provide improved units of this description.
  • selector switch and transfer switch units including a gear drive for the former interposed between the two switches which are not subject to the aforementioned drawbacks and limitations including excessive heat losses.
  • gears for operating the selector switch which gears are in the form of a pair of Geneva gears, operate in effect as short-circuited secondary windings of a transformer which is energized by one of the current-carrying leads which project transversely across the two parallel planes defined by the aforementioned pair of Geneva gears and operate, in effect, as a primary transformer winding.
  • the eddy currents generated in this pair of gears may reach such a magnitude as to significantly reduce the overall efiiciency of the transformer with which the load-tap changer is associated.
  • the magnetic field generated by the current flowing in one of the leads conductively connecting the selector switch and the transfer switch is cancelled by the magnetic field generated by the current flowing in the outgoing lead extending parallel to the current-carrying lead conductively connecting the selector switch and the transfer switch.
  • the outgoing lead is carrying a current which is equal, but whose direction is opposite to that in the lead conductively connecting the selector switch and the transfer switch.
  • FIG. 1 is a diagrammatic vertical section of a unit comprising a selector switch, a transfer switch and a selectorswitch-gear-drive, this figure also showing the tapped winding of a transformer operatively related to the above switch unit;
  • FIG. 2 is a section along II-II of FIG. 1;
  • FIG. 3 is a section along III-III of FIG. 1.
  • transfer switch 1 has been applied to generally indicate a transfer switch.
  • the latter comprises four fixed contacts a, relatively movable contact means b and a pair of switching resistors or change-over resistors R.
  • the head portion 2 of the transfer switch 1 includes a gear drive for pivoting the movable contact means selectively in clockwise direction and in counterclockwise direction. This gear drive will be described below more in detail.
  • Transfer switch 1 is housed in a cylindrical housing 3 which supports at the upper end thereof the aforementioned head portion 2.
  • Reference character 4 has been applied to generally indicate a selector switch arranged below transfer switch 1.
  • the selector switch 4 includes a plurality of fixed contacts 37 and 38 of which each is conductively connected to a tap of a tapped transformer winding Tr.
  • Winding Tr is provided with a plurality of taps of which two are designated by the reference characters A and B.
  • Fixed contacts 37, 38 are arranged in coaxial patterns and supported by rods 39 of insulating material.
  • Fixed contacts 37 are conductively connected to the odd numbered taps of winding Tr and fixed contacts 38 are conductively connected to the even numbered taps of winding Tr.
  • Fixed contacts 37 and 38 are arranged in two different horizontal planes. All odd numbered taps of winding Tr are conductively connected to the fixed contacts 37 arranged in a circular pattern at a higher level and all even numbered taps of winding Tr are conductively connected to the fixed contacts 38 arranged in a circular pattern at a lower level.
  • the upper fixed contact 37 and the lower fixed contacts 38 define a pair of concentric circles.
  • the selector switch 4 further comprises a pair of anular contacts 35, 36 of which one is arranged at substantially the same level as the fixed contacts 37 conductively connected to odd numbered taps of winding Tr and the other is arranged at substantially the same level as the fixed contacts 38 conductively connected to the even numbered taps of winding Tr.
  • Contacts 35, 36 are arranged on the outer surface of hollow insulating column 32 by which they are supported.
  • the selector switch 4 further comprises a pair of contact bridges 5 and 6 of which the former is arranged at a higher level than the latter.
  • the contact bridges 5 and 6 are pivotable about a vertical axis defined by the straight line interconnecting the centers of the aforementioned two circular groups of fixed contacts 37, 38.
  • This axis is identical with the axis of hollow column 32.
  • Contact bridge 5 when pivoted is capable of selectively conductively interconnecting each of the fixed contacts 37 connected to an odd numbered transformer tap with the upper annular contact 35.
  • contact bridge 6 when pivoted is capable of selectively conductively interconnecting each of the fixed contacts 38 connected to an even numbered transformer tap with the lower annular contacts 36.
  • selector switches which has been shown in the drawing in a relatively diagrammatic fashion has been described in considerable detail and has been claimed in US. Patent 3,194,900 to Alexander Bleibtreu, issued July 13, 1965 for Modular Tap-Changing Selector Switch for Connecting Selectively Fixed Tap Contacts to a Transfer Switch, assigned to the same assignee as the present invention, and in US.
  • Reference numeral 7 has been applied to generally indicate the Geneva gear drive for selector switch 4.
  • the gear drive in head 2 operates a vertical shaft 8 which, in turn, operates the Geneva gear drive 7 for the selector switch 4.
  • the lower end of shaft 8 supports a gear 11.
  • Pin 11a projects axially from the upper surface of gear 11 and pin 11b projects axially from the lower surface of gear 11.
  • Reference numeral 15 has been applied to indicate a ho]- low or tubular cylindrical bearing arranged in coaxial relation to the upper group and the lower group of fixed contacts 37, 38 of selector switch 4. Bearing 15 supports a pair of superimposed Geneva gears 9, 10 each for operating one of the aforementioned contact bridges 5 and 6.
  • Reference numerals 12 and 13 have been applied to indicate the two leads conductively interconnecting the selector switch 4 and the transfer switch 1. These two leads are covered by appropriate insulating means and project transversely through Geneva gear drive 7, and more particularly through the central passage defined by vertical bearing 15 for Geneva gears 9, 10. Numeral 14 has been applied to indicate the outgoing lead of transfer switch 1. This lead is likewise covered with appropriate insulating means and projects transversely through Geneva gear drive 7 or, to be more specific, through the central passage defined by vertical bearing 15 or Geneva gears 99, 10.
  • a change from tap A to tap B involves a pivotal motion of the movable contact means b of transfer switch 1 in clockwise direction as seen in FIG. 1.
  • the consecutive steps involved in the tap-changing operation are of no consequence, except the last step establishing the following current path.
  • Tap B of winding Tr one of the fixed contacts 38 on the lower level of selector switch 4, contact bridge 6, lower annular contact 36, lead 13, right fixed contact a of transfer switch 1, lead 14, terminal Y.
  • the current in leads 13, 14 is of the same magnitude, but of opposite direction.
  • the magnetic fields established by the current in leads 13, 14 cancel each other. Consequently no eddy currents are induced in vertical bearing 15 and in Geneva gears 9 and 10.
  • the head portion 2 houses a spring motor 21 which may be Wound up by driving shaft 26 by means of gear transmission 25 and crank mechanism 14, 23.
  • Transfer switch 1 is operated by spring motor 21 by the intermediary of operating shaft 22.
  • Reference numeral 31 has been applied to indicate the housing of selector-switch-driving-gear 7, and reference numeral 41 has been applied to indicate the base or bottom plate of selector switch 4.
  • Hollow insulating column 32 establishes a mechanical tie between housing 31 and base plate or bottom plate 41.
  • Contact supporting rods 39 of insulating material form a squirrel-cage-shaped structure coaxial with hollow insulating column 32.
  • the tubular operating rods 33, 34 for contact bridges 5, 6 revolve around hollow column 32 whenever other taps of transformer winding Tr are selected. In the position of selector switch 4 shown in FIG. 1 but either of the two taps A and B can be selected. To select other taps contact bridges 5, 6 must be operated by Geneva gears 9, 10 and operating rods 33, 34.
  • a single-phase transfer switch and selector switch unit for tapped regulating transformers comprising:
  • a selector switch for selecting taps of a tapped transformer winding and including a plurality of fixed contacts to be connected to the taps of a transformer winding and movable contacts selectively cooperating with said plurality of fixed contacts and pivotable about a vertical geometrical axis;

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Housings And Mounting Of Transformers (AREA)
US554436A 1965-06-30 1966-06-01 Arrangement for avoiding eddy current losses in transfer switch and selector switch units with interposed gear drive Expired - Lifetime US3396254A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM65750A DE1290249B (de) 1965-06-30 1965-06-30 Einphasen-Stufenschalter fuer Regeltransformatoren

Publications (1)

Publication Number Publication Date
US3396254A true US3396254A (en) 1968-08-06

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ID=7311569

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Application Number Title Priority Date Filing Date
US554436A Expired - Lifetime US3396254A (en) 1965-06-30 1966-06-01 Arrangement for avoiding eddy current losses in transfer switch and selector switch units with interposed gear drive

Country Status (9)

Country Link
US (1) US3396254A (fr)
AT (1) AT259082B (fr)
BE (1) BE683445A (fr)
CH (1) CH444955A (fr)
DE (1) DE1290249B (fr)
FR (1) FR1483243A (fr)
GB (1) GB1086425A (fr)
NL (2) NL6608807A (fr)
SE (1) SE322833B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595806A (en) * 1983-12-08 1986-06-17 Mitsubishi Denki Kabushiki Kaisha On-load tap changer
US5056377A (en) * 1989-11-09 1991-10-15 Cooper Industries, Inc. Tap selector anti-arcing system
US5191179A (en) * 1989-11-09 1993-03-02 Cooper Power Systems, Inc. Tap selector anti-arcing system
WO2000010182A1 (fr) * 1998-08-12 2000-02-24 Maschinenfabrik Reinhausen Gmbh Commutateur a gradins avec preselecteur
US20100059356A1 (en) * 2007-05-16 2010-03-11 Christian Hammer Switching arrangement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2529381C3 (de) * 1975-07-02 1979-05-31 Maschinenfabrik Reinhausen Gebrueder Scheubeck Gmbh & Co Kg, 8400 Regensburg Stufenschalter für Stufentransformatoren mit in einem zylindrischen ölgefäß untergebrachten Lastumschalter
DE3935289A1 (de) * 1989-10-24 1991-04-25 Reinhausen Maschf Scheubeck Zylindrischer lastumschalter eines stufenschalters von stufentransformatoren

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233049A (en) * 1962-07-12 1966-02-01 Reinhausen Maschf Scheubeck Integral selector switch and transfer switch unit for tapped regulating transformers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT235411B (de) * 1962-07-12 1964-08-25 Reinhausen Maschf Scheubeck Stufenschalter für Regeltransformatoren

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233049A (en) * 1962-07-12 1966-02-01 Reinhausen Maschf Scheubeck Integral selector switch and transfer switch unit for tapped regulating transformers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595806A (en) * 1983-12-08 1986-06-17 Mitsubishi Denki Kabushiki Kaisha On-load tap changer
US5056377A (en) * 1989-11-09 1991-10-15 Cooper Industries, Inc. Tap selector anti-arcing system
US5191179A (en) * 1989-11-09 1993-03-02 Cooper Power Systems, Inc. Tap selector anti-arcing system
WO2000010182A1 (fr) * 1998-08-12 2000-02-24 Maschinenfabrik Reinhausen Gmbh Commutateur a gradins avec preselecteur
US6849813B1 (en) 1998-08-12 2005-02-01 Maschinenfabrik Reinhausen Gmbh Step switch with selector
US20100059356A1 (en) * 2007-05-16 2010-03-11 Christian Hammer Switching arrangement
US8030583B2 (en) 2007-05-16 2011-10-04 Maschinenfabrik Reinhausen Gmbh Switching arrangement

Also Published As

Publication number Publication date
SE322833B (fr) 1970-04-20
NL130853C (fr)
NL6608807A (fr) 1967-01-02
DE1290249B (de) 1969-03-06
CH444955A (de) 1967-10-15
BE683445A (fr) 1966-12-01
GB1086425A (en) 1967-10-11
FR1483243A (fr) 1967-06-02
AT259082B (de) 1967-12-27

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