US3585276A - Transformer insulation construction comprising concentric cylinders and spacing sticks - Google Patents

Transformer insulation construction comprising concentric cylinders and spacing sticks Download PDF

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Publication number
US3585276A
US3585276A US874809A US3585276DA US3585276A US 3585276 A US3585276 A US 3585276A US 874809 A US874809 A US 874809A US 3585276D A US3585276D A US 3585276DA US 3585276 A US3585276 A US 3585276A
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United States
Prior art keywords
cylinders
sticks
corrugations
insulation
insulation construction
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Expired - Lifetime
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US874809A
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English (en)
Inventor
James Gilbert Beckett
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B S AND W WHITLEY Ltd
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B S AND W WHITLEY Ltd
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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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/322—Insulating of coils, windings, or parts thereof the insulation forming channels for circulation of the fluid

Definitions

  • lllf 27/08 sticks arranged between each pair of adjacent cylinders for HOlf 27/30 maintaining a radial spacing therebetween, integral portions [50] ⁇ "ieldofSearch l74/l38.3; 336/60, 185, 199, 207; 310/65 of said cylinders adjacent each of the sticks forming lateral locating means for said sticks.
  • Transformers comprise a magnetic core having two or more legs depending on whether the AC supply is single or multiphase and formed of laminations of transformer alloy steel, and on which two or more coils are woundi Whilst the low voltage and high voltage coils may be wound on different legs, this arrangement is not usual and the present invention is concerned only with transformers in which a ⁇ low voltage coil, a high voltage coil and, where required, a tap winding and/or a tertiary coil are positioned on top of one another, although not necessarily in the order mentioned, on the same leg, the coils being separated by interwinding insulation. More than one leg of the transformer may be provided with such an assembly of coils and interwinding insulation.
  • a preferred form of interwinding insulation for heavy duty transformers comprises a plurality of concentric cylinders of insulating material, the cylinders being separated from each other by longitudinally disposed spacers known as sticks
  • Each cylinder of insulating material is formed either of many laps of paper or of a single layer of insulating pressmost cylinder to the outermost so that the corrugations can be radially aligned from one cylinder to the next as shown in the Figure; the depth of the corrugation is preferably approximately equal to the thickness of the pressboard.
  • the cylinders are spaced from each other by sticks l5 formed of laminated orresin bonded pressboard which extend over the whole height of the cylinders.
  • One surface of each stick l5 is provided with a rib 16 adapted to fit into a reentrant corrugation and the opposed surface is provided with a channel 17 adapted to fit over a projecting corrugation.
  • the inner cylinder 12 is spaced from the tum l0 by sticks 18 and the outer cylinder 12 is spaced from the turn 1l by sticks 19, the sticks 18 and 19 being radially aligned with the radially aligned sets of sticks 15.
  • the sticks 18 'and 19 are formed of laminated or resin bonded pressboard and extend over the whole height of the cylinders; the sticks 18 have a rib 20 y similar to the rib 16 of the sticks l5 and the sticks 19 have a channel 2l similar to the channel 17 of the sticks l5.
  • FIG. 2 is generally similarto that Aof i pressboard, are of L-shaped section with the two arms being of board; the sticks are formed of insulating pressboard.
  • Aof i pressboard are of L-shaped section with the two arms being of board; the sticks are formed of insulating pressboard.
  • the sticks In order to obtain the necessary mechanical strength and to maintain adequate coolant passages between the layers of insulating material forming the interwinding insulation, it is necessary that in each space between the layers the sticks should be accurately parallel and that the sticks should be accurately radially aligned from one space to the next. Cotton tapes or adhesive have been used to position the sticks in correct alignment in each space but the use of either of these means gives rise to disadvantages.
  • an improved interwinding insulatio'n construction which comprises a plurality of concentric spaced cylinders of insulating pressboard, the cylinders being provided with longitudinal corrugations which are radially aligned from one cylinder to the next and the cylinders being maintained in spaced relation by axially directed sticks positioned between the cylinders, each stick being located laterally by its interengagement with a pair of radially aligned corrugations of adjacent cylinders.
  • the corrugations of all the cylinders are directed in the same sense, that is outwardly or inwardly in relation to the axis of the cylinders, and the sticks have one surface formed to t within a reentrant corrugation and an opposed surface formed to fit over a projecting corrugation.
  • FIG. l is a section transverse to the leg axis of a transformer, of a portion of interwinding insulation
  • FIG. 2 is a similar cross section of a portion of another construction of interwinding insulation.
  • each cylinder may be formed in a single piece, the free ends being joined together by a scarf joint 13, or may be formed from two or more pieces, abutting pieces being joined together again by a scarf joint.
  • Each cylinder is provided with spaced, regular, longitudinal corrugations 14. The circumferential spacing of the corrugations increases from the inner- Mequal length.
  • the cylinders are suitably formed of insulating pressboard one-fourth inch thick.
  • midpoints of the corrugations are spaced apart by a distance' determined by the design criteria of the transformer manufac- 40 turer; this distance will normally be from l to 4% inches.
  • separation between the cylinders is preferably about the same as the thickness ofthe pressboard.
  • tions comprising four concentric corrugated cylinders or pressboard, larger or smaller numbers of cylinders can equally well be used, the number of cylinders being determined by the transformer design requirements.
  • interwinding insulation constructions described are (i) that the sticks are positively located throughout their length so that there is substantially no risk of their becoming laterally displaced during operation of the transformer so that the interwinding insulation can be relied upon to withstand the severe mechanical stresses to which it is liable to be subjected and (ii) that the interwinding insulation is better able to adjust to dimensional changes arising from changes in its moisture content and other factors owing to the corrugated form of the pressboard cylinders.
  • the interwinding insulation is easier to assemble than the insulation constructions previously used.
  • a transformer interwinding insulation comprising a plurality of concentriccylinders of insulating pressboard and a plurality of axially directed sticks arranged between each pair of adjacent cylinders for maintaining a radial spacing therebetween, the improvement which comprises lateral locating means foreach of said sticks, said means comprising cooperating, integral portions of opposed surfaces of adjacent cylinders engaging and positively locating each said stick in relation to said integral portions.
  • interwinding insulation which comprises a plurality of concentric spaced cylinders of insulating pressboard, said cylinders having longitudinal corrugations which are radially aligned from ont. ⁇ cylinder to the next and a plurality of axially directed sticks positioned between said cylinders, each stick being located laterally by its interengagement with a pair of radially aligned corrugations of adjacent cylinders and serving to maintain radial spacing of said adjacent cylinders.
  • each of said cylinders comprises at least one longitudinal scarf joint.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
US874809A 1968-11-08 1969-11-07 Transformer insulation construction comprising concentric cylinders and spacing sticks Expired - Lifetime US3585276A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB52961/68A GB1213365A (en) 1968-11-08 1968-11-08 Transformer insulation construction

Publications (1)

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US3585276A true US3585276A (en) 1971-06-15

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US874809A Expired - Lifetime US3585276A (en) 1968-11-08 1969-11-07 Transformer insulation construction comprising concentric cylinders and spacing sticks

Country Status (4)

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US (1) US3585276A (fr)
CH (1) CH504767A (fr)
GB (1) GB1213365A (fr)
SE (1) SE358504B (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965378A (en) * 1973-05-29 1976-06-22 Siemens Aktiengesellschaft Pole coil for electric machines and apparatus
US4149100A (en) * 1974-02-01 1979-04-10 Siemens Aktiengesellschaft Excitation winding arrangement for a synchronous electric machine having a rotor with salient poles
US20090195092A1 (en) * 2008-01-31 2009-08-06 Gagnon Gilles D Winding end turn cooling in an electric machine
EP2330603A1 (fr) * 2009-12-04 2011-06-08 ABB Technology AG Transformateur doté d'un enroulement de bande
US20120092113A1 (en) * 2010-10-15 2012-04-19 Abb Technology Ag Oil transformer insulation module
CN103779043A (zh) * 2012-10-25 2014-05-07 台达电子企业管理（上海）有限公司 大功率电磁组件
CN104575981A (zh) * 2013-10-29 2015-04-29 台达电子企业管理（上海）有限公司 用于电磁组件的导电结构及电磁组件
US9024713B1 (en) 2012-08-09 2015-05-05 Power Distribution Products, Inc. Extreme duty encapsulated transformer coil with corrugated cooling ducts and method of making the same
US9142338B2 (en) 2010-10-15 2015-09-22 Abb Technology Ag Oil transformer insulation module
DE102021205654A1 (de) 2021-06-02 2022-12-08 Siemens Energy Global GmbH & Co. KG Druckvorrichtung und Aktivteil eines Transformators

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2509904B1 (fr) * 1981-07-20 1985-12-27 Legrand Sa Cale de bobinage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1452158A (en) * 1921-07-21 1923-04-17 Pittsburgh Transformer Co Transformer
GB199118A (en) * 1922-03-14 1923-06-14 Arthur Percy Morris Fleming Improvements in electrical insulating cylinders
GB269933A (en) * 1926-04-24 1928-02-02 Siemens Schuckertwerke Gmbh Improvements in or relating to disc coils for transformers
US2844746A (en) * 1956-02-17 1958-07-22 Gen Electric Support means for rotor end windings of dynamoelectric machines
CA715677A (en) * 1965-08-10 E. James Ronald Coil assembly for electrical apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA715677A (en) * 1965-08-10 E. James Ronald Coil assembly for electrical apparatus
US1452158A (en) * 1921-07-21 1923-04-17 Pittsburgh Transformer Co Transformer
GB199118A (en) * 1922-03-14 1923-06-14 Arthur Percy Morris Fleming Improvements in electrical insulating cylinders
GB269933A (en) * 1926-04-24 1928-02-02 Siemens Schuckertwerke Gmbh Improvements in or relating to disc coils for transformers
US2844746A (en) * 1956-02-17 1958-07-22 Gen Electric Support means for rotor end windings of dynamoelectric machines

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965378A (en) * 1973-05-29 1976-06-22 Siemens Aktiengesellschaft Pole coil for electric machines and apparatus
US4149100A (en) * 1974-02-01 1979-04-10 Siemens Aktiengesellschaft Excitation winding arrangement for a synchronous electric machine having a rotor with salient poles
US8198762B2 (en) * 2008-01-31 2012-06-12 Pratt & Whitney Canada Corp. Winding end turn cooling in an electric machine
US20090195092A1 (en) * 2008-01-31 2009-08-06 Gagnon Gilles D Winding end turn cooling in an electric machine
EP2330603A1 (fr) * 2009-12-04 2011-06-08 ABB Technology AG Transformateur doté d'un enroulement de bande
US8471662B2 (en) * 2010-10-15 2013-06-25 Abb Technology Ag Oil transformer insulation module
US20120092113A1 (en) * 2010-10-15 2012-04-19 Abb Technology Ag Oil transformer insulation module
US9142338B2 (en) 2010-10-15 2015-09-22 Abb Technology Ag Oil transformer insulation module
US9024713B1 (en) 2012-08-09 2015-05-05 Power Distribution Products, Inc. Extreme duty encapsulated transformer coil with corrugated cooling ducts and method of making the same
CN103779043A (zh) * 2012-10-25 2014-05-07 台达电子企业管理（上海）有限公司 大功率电磁组件
CN103779043B (zh) * 2012-10-25 2017-09-26 台达电子企业管理（上海）有限公司 大功率电磁组件
CN104575981A (zh) * 2013-10-29 2015-04-29 台达电子企业管理（上海）有限公司 用于电磁组件的导电结构及电磁组件
US9734943B2 (en) 2013-10-29 2017-08-15 Delta Electronics (Shanghai) Co., Ltd. Electromagnetic device and conductive structure thereof
DE102021205654A1 (de) 2021-06-02 2022-12-08 Siemens Energy Global GmbH & Co. KG Druckvorrichtung und Aktivteil eines Transformators

Also Published As

Publication number Publication date
CH504767A (fr) 1971-03-15
GB1213365A (en) 1970-11-25
SE358504B (fr) 1973-07-30

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