US3719910A - Electrical inductive apparatus - Google Patents

Electrical inductive apparatus Download PDF

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Publication number
US3719910A
US3719910A US00192523A US3719910DA US3719910A US 3719910 A US3719910 A US 3719910A US 00192523 A US00192523 A US 00192523A US 3719910D A US3719910D A US 3719910DA US 3719910 A US3719910 A US 3719910A
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US
United States
Prior art keywords
winding
section
voltage rating
sections
voltage
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
US00192523A
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English (en)
Inventor
F Golaski
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 Inc USA
Original Assignee
Westinghouse Electric Corp
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Publication date
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Publication of US3719910A publication Critical patent/US3719910A/en
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Assigned to ABB POWER T&D COMPANY, INC., A DE CORP. reassignment ABB POWER T&D COMPANY, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/303—Clamping coils, windings or parts thereof together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings

Definitions

  • One pattern of connections places all or part of the middle 5 R fereh es Ci d winding section in series and in phase with the other wIndIng sections to Increase the voltage rating.
  • UNITED STATES PAT NT Another pattern of connections places all or part of 2 840 790 6/1958 vogelet al 336/150 the middle winding section in series and antiphase 3182248 5/1965 McNamee :3 X with the other winding sections to decrease the volt- 2:253:l65 8/1941 Beymer.... ..323/48 g rating-
  • the middle Winding sectiqn y be 1,057,077 3/1913 Moody....
  • a tap arrangement widely used in power transformers uses two high voltage windings sections with two intermediate tap terminals connected to each winding section.
  • the tap terminals are locatedvnear the end of the winding section which is adjacent to the tapped end of the other winding section.
  • the voltage rating of the high voltage winding may be increased or decreased by 5 in 2%percent steps. This is usually accomplished by connecting jumper connectors between the appropriate taps before the transformer is energized. For example, a transformer having a nominal high voltage, rating of 7,200 volts may be jumped to change its high voltage winding rating to 6,840, 7,020, 7,380 or 7,560 volts.
  • the tapping arrangement functions satisfactorily, it has certain inherent disadvantages.
  • the number of tap terminals which must be jumped equals six; the four intermediate tap terminals and two end terminals.
  • the probability of making a defective jumper connection increases with the number of tap terminals involved.
  • the four intermediate tap terminals are made between the ends of the winding sections. This requires a splice or braze to be made within the winding section and increases the probability of defective joints and stray brazing material in the apparatus, and increases the labor required to form the taps.
  • Short circuit strength is an important factor in determining the usefulness of a power transformer.
  • the physical size of the low voltage winding is related to the physical size of the high voltage winding. Since the low voltage winding tends to collapse under short circuit conditions, the sizes of the windings are important in determining their resistance to short circuit stresses. In other words, the smaller and more compact the winding is, the easier it is to secure and brace against short circuit stresses. Therefore, it is also an object of this invention to provide a high voltage tapped winding which requires less physical space than the prior art winding arrangement.
  • the winding is divided into three axially adjacent winding sections.
  • the middle winding section includes a center-tap terminal and has a voltage rating equal to one-half of the desired voltage rating range of the entire winding.
  • An end terminal for each of the two outside winding sections, the two end terminals of the middle winding section, and the center-tap terminal may be interconnected in various arrangements to provide different ratings for the overall winding voltage.
  • FIG. 1 is a sectional view of a single phase transformer having a high voltage winding structure constructed according to the teachings of this invention
  • FIG. 2 is a schematic diagram of a transformer constructed according to the teachings of this invention.
  • FIG. 3 is a table illustrating some of the possible terminal interconnections which may be used to change the voltage rating of the transformer.
  • FIG. 1 there is shown a sectional view of a single phase power transformer.
  • a laminated magnetic core of the cruciform type is secure by the top end frame 12 and the bottom end frame 14.
  • the locking plates 16 and also help to hold the laminations of the core 10 together with the use of the bolts 18 which project through the core 10.
  • the low voltage or secondary winding 20 is positioned concentrically around a leg of the magnetic core 10. Spacing rods 22 center the secondary winding 20 and help prevent collapse of the winding structure under short circuit stresses.
  • the high voltage or primary winding structure 24 is concentrically disposed around the secondary winding 20 and comprises: a plurality of radially disposed conductor turns which form an array of coil disks stacked in an axial direction. The primary winding 24 is secured and compressed by the pressure blocks 26 and the pressure rings 28.
  • the winding structures 20 and 24 which are shown disposed on the magnetic core 10 have similar counterparts in the windings 30 and 32, which are disposed on the other core leg.
  • An insulated barrier 34 separates the winding structures.
  • coil disk interconnections, radial spacers, and tap terminals are not illustrated relative to the winding 24, it is to be understood that they may be present as illustrated in relation to the winding 32 and as will be described hereinafter in more detail.
  • the main leads of the windings are not shown for clarity of the figure, however, the main lead arrangement may be such that the separate leg windings may be connected in series or in parallel circuit relationship. It is also within the contemplation of this invention that the primary winding 32 may be disposed on a core leg of a multiple phase transformer core.
  • the high voltage or primary winding 32 comprises three winding sections.
  • the tap terminals 36, 38, 40, 42 are connected to The tap terminals 36, 38, 40, 42.
  • winding sections and 44 provide means for interconnecting the winding sections. Jumper connections are usually used for this purpose and may be attached to the proper terminal by nut and bolt means.
  • the three winding sections are all concentrically disposed around the secondary winding 30, .with each winding section located in a different axial position from that of the other winding sections.
  • FIG. 2 is a schematic diagram illustrating the position of the tap terminals.
  • the high voltage or primary winding 32 comprises the winding sections 46, 48 and 50.
  • winding sections 46 and 50 will have the same number of turns, thus the same voltage rating.
  • the winding section 48 will have a lower voltage rating than either of the other two winding sections.
  • the winding section 48 has a voltage rating which is equal to 5 percent of the sum of the voltage ratings of the windings sections 46 and 50.
  • the reference letters A, B, C, D and E correspond to the tap terminals 36, 38, 40, 42 and 44 respectively.
  • the tap terminal 36 is located at the end of the winding section 46 and the tap terminal 44 is located at the end of the winding section 50.
  • the tap terminals 38 and 42 are located at the ends of the winding section 48 and the tap terminal 40 is located at the center of the winding section 48.
  • the total voltage rating of the winding 32 which exists between the terminals 52 and 54 is dependent upon the connection arrangement of the jumper connectors.
  • connection arrangement may be such to add or subtract part or all of the voltage of the winding section 48 to the other winding sections, or it may be such to bypass the voltage of the winding section 48 completely.
  • FIG. 3 is a table representing some possible connection arrangements. The table of FIG. 3 is based on a middle winding section, such as the winding section 48, having a voltage rating equal to 5 percent of the sum of the voltage ratings of the other winding sections. Other voltage ratings are within the contemplation of this invention.
  • the voltage rating of the winding 32 is 5 percent below a predetermined nominal value.
  • the voltage rating is 2%percent below the nominal value.
  • the nominal voltage rating is obtained when A is connected to E.
  • Connection to the tap terminal C may be desirable to reduce the floating effects of the winding section 48.
  • the decreases in rated voltage are obtained by connecting the winding section 48 with the other winding sections in a out of phase relationship. When they are connected in phase, an increase in the nominal voltage rating occurs. The increase is 2 /percent when A is connected to B and C is connected to E. The increase is a 5 percent when A is connected to B and D is connected to E.
  • Electrical inductive apparatus comprising a magnetic core, primary and secondary winding structures concentrically disposed around a leg of said magnetic core with said primary structure being positioned outermost from said magnetic core, said primary winding structure being divided into first, second and third winding sections, said second winding section being axlocated adjacent to the outside of the winding structure and adaptable for connection to each other by jumper connections, with the connection arrangement determining the voltage rating of said primary winding structure, the voltage rating of said second winding section being equal to one-half the voltage rating range of said primary winding structure.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
US00192523A 1971-10-26 1971-10-26 Electrical inductive apparatus Expired - Lifetime US3719910A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19252371A 1971-10-26 1971-10-26

Publications (1)

Publication Number Publication Date
US3719910A true US3719910A (en) 1973-03-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00192523A Expired - Lifetime US3719910A (en) 1971-10-26 1971-10-26 Electrical inductive apparatus

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US (1) US3719910A (ru)
JP (1) JPS52532B2 (ru)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997020328A1 (fr) * 1995-11-29 1997-06-05 Georgy Nikolaevich Alexandrov Reacteur de derivation commande
US8004267B2 (en) * 2007-08-21 2011-08-23 Ford Global Technologies, Llc Power converter system for an automotive vehicle and method for configuring same
US20160148749A1 (en) * 2014-11-21 2016-05-26 Abb Technology Ag Tap configurations for a transformer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5718310A (en) * 1980-07-08 1982-01-30 Hitachi Ltd Transformer
JPS6111663U (ja) * 1984-06-27 1986-01-23 株式会社 山田ドビ− 材料案内装置
RU2688882C1 (ru) * 2018-08-27 2019-05-23 Федеральное государственное бюджетное образовательное учреждение высшего образования "Вятский государственный университет" (ВятГУ) Управляемый шунтирующий реактор-автотрансформатор

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1057077A (en) * 1910-03-02 1913-03-25 Gen Electric Transformer.
US2253165A (en) * 1940-03-08 1941-08-19 Gen Electric Tap-changing system
US2840790A (en) * 1956-06-12 1958-06-24 Allis Chalmers Mfg Co Tapped winding arrangement for variable ratio transformer
US2994030A (en) * 1958-10-20 1961-07-25 Int Rectifier Corp Voltage control
US3162799A (en) * 1961-01-30 1964-12-22 Osborne Electronic Corp Variable ratio transformer
US3182248A (en) * 1962-01-29 1965-05-04 Dressen Barnes Electronics Cor Voltage building transformer
DE1264600B (de) * 1962-01-11 1968-03-28 Ministerul Metalurgiei Si Cons Drosselspule zur Begrenzung der Stromstaerke zwischen den Anzapfkontakten von Stufentransformatoren
US3484727A (en) * 1967-10-26 1969-12-16 Allis Chalmers Mfg Co Tapped transformer winding having high short circuit strength

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1057077A (en) * 1910-03-02 1913-03-25 Gen Electric Transformer.
US2253165A (en) * 1940-03-08 1941-08-19 Gen Electric Tap-changing system
US2840790A (en) * 1956-06-12 1958-06-24 Allis Chalmers Mfg Co Tapped winding arrangement for variable ratio transformer
US2994030A (en) * 1958-10-20 1961-07-25 Int Rectifier Corp Voltage control
US3162799A (en) * 1961-01-30 1964-12-22 Osborne Electronic Corp Variable ratio transformer
DE1264600B (de) * 1962-01-11 1968-03-28 Ministerul Metalurgiei Si Cons Drosselspule zur Begrenzung der Stromstaerke zwischen den Anzapfkontakten von Stufentransformatoren
US3182248A (en) * 1962-01-29 1965-05-04 Dressen Barnes Electronics Cor Voltage building transformer
US3484727A (en) * 1967-10-26 1969-12-16 Allis Chalmers Mfg Co Tapped transformer winding having high short circuit strength

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997020328A1 (fr) * 1995-11-29 1997-06-05 Georgy Nikolaevich Alexandrov Reacteur de derivation commande
US8004267B2 (en) * 2007-08-21 2011-08-23 Ford Global Technologies, Llc Power converter system for an automotive vehicle and method for configuring same
DE102008044429B4 (de) * 2007-08-21 2015-11-26 Ford Global Technologies, Llc Energieumwandlungssystem für ein Kraftfahrzeug
US20160148749A1 (en) * 2014-11-21 2016-05-26 Abb Technology Ag Tap configurations for a transformer

Also Published As

Publication number Publication date
JPS52532B2 (ru) 1977-01-08
JPS4857124A (ru) 1973-08-10

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AS Assignment

Owner name: ABB POWER T&D COMPANY, INC., A DE CORP., PENNSYLV

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.;REEL/FRAME:005368/0692

Effective date: 19891229