US3705371A - Electrical winding - Google Patents

Electrical winding Download PDF

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Publication number
US3705371A
US3705371A US228076A US3705371DA US3705371A US 3705371 A US3705371 A US 3705371A US 228076 A US228076 A US 228076A US 3705371D A US3705371D A US 3705371DA US 3705371 A US3705371 A US 3705371A
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United States
Prior art keywords
winding
discs
coil discs
winding group
coil
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Expired - Lifetime
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US228076A
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English (en)
Inventor
Robert I Van Nice
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CBS Corp
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Westinghouse Electric Corp
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Publication date
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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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/343—Preventing or reducing surge voltages; oscillations

Definitions

  • ABSTRACT winding structure In a second embodiment, an inter-' leaved turn winding group is connected between the winding groups of the first embodiment and the line end of the winding.
  • Hybrid windings consisting of high series capacitance coils at line ends and conventional and lower cost coils, for the remainder of the winding have also been proposed. Some of these have been useful; however, the series capacitance discontinuity which exists between the difi'erent forms of winding coils is conducive to voltage oscillations in the winding. Several arrangements have been used to reduce this series I capacitance discontinuity, such as the arrangement-disclosed in U.S. Case No. 41 ,930, filedDec. 8, 1970, Ser.
  • An'ideal power transformer winding would have high series capacitance, high voltage break-down particularly at the line end, and relatively low manufacturing costs. Unfortunately, the arrangements known in the nected by start-start and finish-finish connections.-
  • the double-disc winding involves a minimal amount of hand labor to construct, the potential between discs is greater than with a single-disc winding.
  • adjacent coil discs are interconnected by start-finish connections.
  • the labor involved in winding and interconnecting'the single coil discs is greater than in double-disc windings.
  • winding structure comprises at least two winding groups.
  • a first group consists of double-disc continuous for by making the disc-to-disc spacing in the second winding group less than in the first winding group.
  • a third or interleaved turn disc coil winding group is positioned-at the line end.”
  • This third winding group is specially constructed to have a moderate value of series capacitance to prevent a large discontinuity in series capacitance between the-winding groups.
  • FIG. 1 is a partial view of a transformer constructed according to one embodiment of this invention with the groups of the windings shown in phantom;
  • FIGS. 2, 3 and 4 are schematic diagrams of winding structures constructed according to embodiments of this invention.
  • FIG. 5 is a table listing typical spacing distances, in inches, for the winding structures shown in FIGS. 2, 3 and.
  • FIG. 6 is a partial view of a transformer constructed I according to an embodiment of this invention having three winding groups.
  • FIG. 7 is a schematic diagram of a winding structure constructed with three winding groups.
  • DESCRIPTION OF THE PREFERRED I EMBODIMENTS prises a plurality of coil discs which are wound, connectedand spaced such thatthe surge voltage strength of the winding group 14 is greater than that of the winding group 16.
  • the winding group 16 comprises a plurality of coil discs which are less expensive to construct than the discs of the winding group 14.
  • the portion of the winding 12 which is shown is connected only to the line lead 22.
  • the other end of the winding 12, although not illustrated, would be connected to another lead.This other lead may or may not be'connected to line potential and subjected to high surge voltages.
  • the winding is delta finish-finish connection 40 and the coil disc 36 is interconnected to the coil disc 34 by the transposed startstart connection 42.
  • the maximum voltage developed between the discs is less than that which would be obtained with start-start or finish-finish connections as shown in the winding group 16.
  • the maximum voltage between discs having start-finish connections is about one-half that of discs having startstart or finish-finish connections. Consequently, the surge voltage strength of the winding group 14 is greater than that of the winding group 16 and this is desirable since higher surge voltage strength is needed near the line end of the winding 12.
  • the winding group 16 may be constructed of the less expensive start-start and finish-finish connected coil discs and the winding group 14 may be constructed of start-finish connected coil discs which have a lower disc-to-disc connected, both leads would be connected to line potential. When wye connected, one lead would be connected to a neutral point which may be grounded. When both leads are connected to line potential, a
  • winding group having a high surge voltage strength should be adjacent both ends of the winding 12. For simplicity reasons, only one end of the winding 12 will be shown and described in detail. The other end may or may not have a high surge strength'winding group located thereat.
  • FIG. 2 illustrates a physical and electrical schematic of a winding 12 constructed according to one embodiment of this invention.
  • A. laminated magnetic core 10 is surrounded by a low-voltage winding 24 which has an insulation structure 26 disposed thereabout.
  • the highvoltage winding 12 comprises the winding groups 14 and 16.
  • the winding group 14 comprises a plurality of coil discs, each axially positioned at a different location in the winding group 14.
  • Each coil disc involves four conductor-turns, such as lA-lB, 2A-2B, 3A- 3B and 4A-4B in the coil disc 28.
  • the numbers represent the turns and the letters represent the conductor strands.
  • the coil disc 28 is wound with four turns of two This nomenclature applies to other coil discs in this and other figures;
  • the coil disc 30 is interconnected to the coil disc 28 by the start-finish connection 31 in which the A and B strands are suitably transposed.
  • the start-finish convoltage is provided.
  • The. reduction of disc spacing in the winding group 14 increases the inductance per unit length of the winding group 14 over the winding group-16.
  • the coil discs of the winding group 14 may be wound with fewer turns than the discs in the winding group 16. Normally, about a 5 percent reduction in turns is required to make the inductance per unit length uniform.
  • the small variation in inductance per unit length caused .by the different spacings is not particularly critical, and it is within the contemplation of this invention that the number of coil disc turns may or may not be changed to provide a substantially uniform inductance per unit length.
  • the double-disc winding such as the winding group 16 of FIG. 1
  • thesingle-disc winding such as the winding group 14 of FIG. 1.
  • the start-finish connections are manually made and, especially if they require metal joining operations at the start and finish turns, and less economical thanstart-start or finish-finish connections which are. simply formed by bending.
  • FIG. 3 illustrates a winding 12 which comprises a winding group 14 constructed of coildiscs 44. 46 and 48 which have conductors that spiral outwardly.
  • the line lead 22 is connected to the start conductor turn lA-lB.
  • the discs are interconnected by the start-finish *Reducing the spacings between the coil discs which are connected by start-finish connections may impose a clearance restriction between the discs for the physical placement of the start-finish connection.
  • FIG. 4 illustrates an arrangement which may be used to provide a windinggroup having higher surge strength than a dollhie-disc winding group.
  • the winding group 14 comprisescoil discs which are interconnected by start-finish connections and by a start-start connection.
  • a similar arrangement would be obtained with a finish-finish connection in place of the start-start connection, in which case discs 66 and 68 would be replaced by a pair of discs similar to the discs 60 and 62
  • the coil discs 60 and 62 are interconnected by the start-finish connection 64 which is physically located between the coil discs 62 and 66.
  • Typical spacings are tabulated, in inches, in FIG. 5. Additional discs interconnected by start-finish-connections, such as the connection 68, may be included in the winding group 14. As with the other embodiments of this invention, the number of discs, or repeating disc patterns, per winding group is determined by'the type and rating of the winding and may be changed without departing from the scope of the invention. a
  • FIG. 6 illustrates the winding groups 14,16 and17f which are interconnected by the leads 18and 19.
  • the winding groups 14 and 16 may be similar to the winding groups taught in the other embodiments of this invention.
  • the winding group 17 may comprise a plurality of interleaved-turn coil discs which provide a suitable series capacitance in relation to the series capacitance of the winding groups- 14 and 16.
  • FIG. 7 illustrates an embodiment of the invention which is shown generally in FIG. 6.
  • the winding group 17 is described in detail in US. Case No. 41 ,930, filed Dec. 8, I970, Ser. No. 96,0l0, and may be constructed in any of the arrangements taught by that patent.
  • the coil discs 70, 72, 74 and 76 are spirally wound to form a plurality of conductor-turns.
  • the conductor-turns are numbered according to their electrical distance from the line lead 22.
  • conductor-turn 2 has two turns electrically connected between it and the line lead 22.
  • multipleconductors may be used in any of the winding groups and such is within the contemplation of this invention.
  • Turn insulation such as the insulation 78, is shown thicker in the winding group 17 than in the other winding groups.
  • the series capacitance of the interleaved-turn winding group 17 is purposely maintained at a value equal to lessthan approximately four times the series capacitance of the other winding groups. A value of two is satisfactory.
  • the series capacitance of the interleaved-turn winding group 17 is due largely to the capacitance between the conductor turns.
  • the series capacitance of the continuous winding groups is due largely to the disc-to-disc capacitance in transformers having medium power ratings.
  • the series capacitance per disc in the winding group 17 would be in the order of two times the series capacitance per disc in the winding groups 14 and 16.
  • the ease of matching the winding group 17 to the winding groups 14 and 16 is a further advantage of this arrangement. Since the combination of the winding groups 14 and 16 permits a high series capacitance, the desired ratio of the winding group 17 capacitance to the capacitance of the winding groups 14 and 16 is more easily obtained.
  • the turn intions areshown to conform to the description in the referenced patent, there are physically only eight conductor'turns per disc in the winding group 1 7.
  • a winding structure for electrical inductive apparatus comprising a line lead, first and second winding groups, said first winding group having a plurality of axially spaced coil discs each having start and finish conductor-turns, said second winding group having a plurality of axially spaced coil discs each having start and finish conductor-turns, said first winding group being disposed electrically closer to said line lead than said second winding group, start-finish connections which interconnect adjacent coil discs in said first winding group, start-start and finish-finish connections which interconnect the coil discs in said second winding group.
  • first winding group comprises first, second and third coil discs, said second coil disc being axially disposed between said first and third coil discs, said first and second coil discs being interconnected by a start-finish connection, said second and third coil discs being interconnected by a start-start connection when said second and third coil discs are interconnected to adjacent coil discs by their finish conductor-tums' and being interconnected by a finish-finish connection when said second and third coil discs are connected to adjacent coil discs by their start conductor-turns, said first and second coil discs being spaced to provide substantially the same capacitance between said first and second coil discs as'exists between said second and third coil discs.
  • first and second coil discs are spaced approximately threefourths of the distance et ween the second and third coil discs, and the startmish connection between the first and second coil discs is physically positioned between said second and third coil discs.
  • the winding structure of claim 1 including a third winding group, said third winding group being located electrically closer to the line lead than the first winding group, said third winding group comprising a plurality of axially spaced coil discs each having start and finish conductor-turns, means interconnecting predetermined ends of adjacent coil discs of said third winding group in series circuit relationship, the coil discs of said third winding group being of the interleaved turn type wherein electrically connected turns are physically separated by turns from an electrically distant portion of the coil disc, the axial spacing of adjacent coil discs in said third winding group exceeding the axial spacing of adjacent coil discs in the first and second winding groups.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Regulation Of General Use Transformers (AREA)
US228076A 1972-02-22 1972-02-22 Electrical winding Expired - Lifetime US3705371A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22807672A 1972-02-22 1972-02-22

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US3705371A true US3705371A (en) 1972-12-05

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US228076A Expired - Lifetime US3705371A (en) 1972-02-22 1972-02-22 Electrical winding

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US (1) US3705371A (hu)
JP (1) JPS5242329Y2 (hu)
CS (1) CS171279B2 (hu)
FR (1) FR2173188B1 (hu)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554523A (en) * 1980-03-05 1985-11-19 Hitachi, Ltd. Winding for static induction apparatus
US20050212644A1 (en) * 2002-06-11 2005-09-29 Hitoshi Yoshimori Air-core coil and manufacturing method thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE661040A (hu) * 1964-03-16
US3391364A (en) * 1966-07-08 1968-07-02 Westinghouse Electric Corp Interleaved turn, high series capacitance electrical winding structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554523A (en) * 1980-03-05 1985-11-19 Hitachi, Ltd. Winding for static induction apparatus
US4571570A (en) * 1980-03-05 1986-02-18 Hitachi, Ltd. Winding for static induction apparatus
US20050212644A1 (en) * 2002-06-11 2005-09-29 Hitoshi Yoshimori Air-core coil and manufacturing method thereof
US7317372B2 (en) * 2002-06-11 2008-01-08 Sht Corporation Limited Air-core coil and process for fabricating the same

Also Published As

Publication number Publication date
FR2173188B1 (hu) 1976-06-11
JPS48111807U (hu) 1973-12-21
JPS5242329Y2 (hu) 1977-09-26
FR2173188A1 (hu) 1973-10-05
CS171279B2 (hu) 1976-10-29

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