US3639872A - Means for controlling the leakage flux in transformers - Google Patents

Means for controlling the leakage flux in transformers Download PDF

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Publication number
US3639872A
US3639872A US103302A US3639872DA US3639872A US 3639872 A US3639872 A US 3639872A US 103302 A US103302 A US 103302A US 3639872D A US3639872D A US 3639872DA US 3639872 A US3639872 A US 3639872A
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United States
Prior art keywords
windings
plates
yoke
leakage flux
yokes
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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
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US103302A
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English (en)
Inventor
Petter Hessen
Ruudi Siirak
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ABB Norden Holding AB
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ASEA AB
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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
    • H01F27/33—Arrangements for noise damping
    • 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
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material

Definitions

  • ABSTRACT In transformers for high power amounts, for collecting the leakage flux and leading it back to the iron core, plates of laminated magnetic material are arranged close to the ends of the winding coils and at least one end of the plates is in magnetic connection with the core.
  • the present invention relates to means for controlling the leakage flux in transformers for high power.
  • plates of laminated magnetic material are arranged as end pieces for the parts of the transformer windings lying outside the yokes of the transformer core. One end of such pieces is magnetically connected to at least one part of the transformer core.
  • FIG. 1 shows a vertical cross section through the upper yoke along the line 1-1 of FIG. 2.
  • FIG. 2 is a horizontal section through a core leg along the line IIII of FIG. 1.
  • FIGS. 3a and 3b show in views similar to FIGS. 1 and 2 a modification where the leakage flux plate is composed of a number of partial plates.
  • FIGS. 4a and 4b Another modification of the invention is shown similarly in FIGS. 4a and 4b where the leakage flux plates are composed of L-shaped strips.
  • FIGS. 50 and 5b show in the same way a construction using plates that are composed of two parts connected to each other along a butt joint.
  • FIGS. 6a and 6b show similarly the strips of the plate interleaved with each other.
  • FIG. 1 the upper yoke is denoted 1.
  • the yoke is held under pressure in the horizontal direction with the help of the pressure beam 3.
  • a number of support flanges 4 are fastened to the pressure beam by welding and they are braced with the help of cross braces 5.
  • a plate 7 of insulating material is also inserted between the yoke l and the pressure beam 3.
  • FIGS. 1 and 2 the low-voltage winding is denoted 8 and the high-voltage winding 9.
  • a tube 10 of insulating material is arranged outside the core leg 2 as indicated in FIG. 2, and a tube 11 is arranged outside the winding 9.
  • Oil channels are arranged between the tube 10 and winding 8 between the two windings and between winding 9 and tube 11. This is common and therefore not specially indicated on the drawing.
  • the inner diameter of the rings is about the same as the inner diameter of the tube 10 and the outer diameter is about the same as the outer diameter of tube 11.
  • the two rings are separated by a number of spacers 14 arranged radially as seen in FIG. 2, thereby providing oil channels 15 between the space inside tube 10 and the space outside tube 11.
  • FIG. 2 the shape of the two plates on one of the core sides is shown.
  • the plates are built up of a number of vertical strips of sheet metal, preferably transformer steel plate, which are placed close to each other and preferably glued together in order to obtain a stable construction.
  • the shape of the plates may vary in many ways and those of FIG. are rhomboidal so that they cover the greater part of the ends of the windings outside the yoke.
  • the triangular area between the two plates and the leg is filled out with a triangular plate 17 of insulating material to support those parts of the windings which are not supported by the leakage flux plates 16.
  • a vertical plate 20 of insulating material is arranged along the inner wall of this recess in order to prevent the inner ends of the strips of the leakage flux plates 16 from coming in contact with the laminations of the yoke. Without this insulating plate the strips in the leakage flux plates would be short-circuited by the outermost steel plate in the yoke and this would result in an overheating in the contact surface.
  • connection plates 21 and 22 of steel plate are laid on the upper side of the inner ends of the leakage flux plates 16 between said ends and the lower side of the outer part 23 of the upper yoke.
  • Thin insulating plates 24 and 25 are inserted above and below the connection plates 21 and 22 to prevent direct contact between the leakage plates 16, the plates 21, 22 and the yoke part 23.
  • the leakage flux that appears inside the winding 8, outside the winding 9 and between the two windings goes upwardly through the oil channels between the spacers l4 and enters the leakage flux plates 16, then turns to the left but is prevented from entering the yoke in the horizontal direction by the plate 20 and is therefore bent upwardly and enters the yokethrough the insulating plate 25, the plates 21 and 22 and then the insulating plate 24.
  • the leakage flux plates provide effective mechanical support for the ends of the windings and thus fulfill two important purposes j
  • the plates may be in one piece as shown in FIG. 2, or divided into a number of narrow parallel partial plates, as will be explained later.
  • connection plates 21 and 22 abut not only the plates in the outer part 23 of the yoke, but also the plates of the core leg 2 through insulating plates 26 and 27 gives a great contact area on the complete transformer core and consequently a small reluctance for the flux.
  • the strips or plates 21, 22 are not, however, essential, and can be omitted, in which case there is no upward extension of recess 25 and the laminations of the yoke engage directly through a thin layer of insulation on the laminations 16.
  • FIG. 2 the leakage flux plates 16 are compact rhomboidal units.
  • FIGS. 30 and 3b show a modification where the plates are composed of a number of partial plates 161, 162, I63 and 164 with narrow openings between them.
  • connection plates 21 and 22 are similar to those of FIG. 2.
  • FIGS. 4a and 4b show the strips in the leakage flux plates and the strips in the connection plates 21 and 22 m e in one piece
  • Such a strip has an L-fonn where the long part 165 forms the leakage flux plate and the short part 166 forms the connection plates 21 and 22.
  • the leakage flux plate 16 is composed of two parts 167 and 168.
  • the two parts are shaped with a straight edge which forms an angle to the longitudinal direction of the strips in the parts and the two strips, there is no appreciable increase in reluctance in the I leakage flux plates.
  • FIGS. 6a and 6b A further, somewhat modified, leakage flux plate is shown in FIGS. 6a and 6b.
  • the plate is composed of bent strips and straight strips.
  • the bent strips, one of which is denoted 30, have one part in magnetic connection with the plates in the transformer leg. The other part reaches into the real leakage flux plate 16, where it is continued by a straight strip 31 with a butt joint 32.
  • These straight strips are interleaved with long strips 33 which reach from the free end of the leakageiflux plate to the bending point of the bent strips.
  • An electrical transformer comprising a magnetic core and windings, the core having yokes and core legs, said windings being arranged around the legs, parts of the end faces of the windings being outside the yokes, a pressure beam on each of the two opposite sides of the yokes in line with the legs, each pressure beam having a flange perpendicular to said two opposite sides of the yokes, said flanges facing one end of the windings with a space between the flangeand the corresponding end-of the windings, leakage flux collecting means comprising at least one plate of laminated magnetic material situated in said space between the flange and an end of each of the windings, the laminations of said plate extending outward from the yoke at a substantial angle to the longitudinal direction of the pressure beam and extending substantially to the periphery of the windings, said collecting means covering the greater'part of the end faces of the windings lying outside the yokes, a portion of the yoke which over

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Insulating Of Coils (AREA)
US103302A 1968-05-30 1970-12-31 Means for controlling the leakage flux in transformers Expired - Lifetime US3639872A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE07242/68A SE338612B (de) 1968-05-30 1968-05-30
US10330270A 1970-12-31 1970-12-31

Publications (1)

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US3639872A true US3639872A (en) 1972-02-01

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US103302A Expired - Lifetime US3639872A (en) 1968-05-30 1970-12-31 Means for controlling the leakage flux in transformers

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US (1) US3639872A (de)
DE (1) DE1926720B2 (de)
GB (1) GB1270594A (de)
NO (1) NO124899B (de)
SE (1) SE338612B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750070A (en) * 1971-11-30 1973-07-31 Westinghouse Electric Corp Pressure ring for transformer windings
US3862393A (en) * 1971-08-20 1975-01-21 Humphreys Corp Low frequency induction plasma system
US4496925A (en) * 1978-11-08 1985-01-29 E. Blum Gmbh & Co. Stepped iron core for static or dynamic electric machines
US4656452A (en) * 1985-11-08 1987-04-07 Rte Corporation Transformer telephone influence tractor core shunt
WO2001063636A2 (en) * 2000-02-23 2001-08-30 Abb Technology Ag Leakage flux protection for transformer clamping bar
JP2014216524A (ja) * 2013-04-26 2014-11-17 株式会社日立製作所 静止誘導電器
EP4040455A1 (de) 2021-02-05 2022-08-10 Hitachi Energy Switzerland AG Transformator mit wicklung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2804397A1 (de) * 1978-02-02 1979-08-09 Bbc Brown Boveri & Cie Magnetgestell fuer einen transformator oder eine drosselspule

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE366467C (de) * 1923-01-08 Siemens Schuckertwerke G M B H Vorrichtung zur Vermeidung von Wirbelstroemen in Eisenteilen von Transformatoren oder Drosselspulen
US1610867A (en) * 1923-09-18 1926-12-14 Gen Electric Transformer
FR886135A (fr) * 1942-05-26 1943-10-06 Acec Transformateurs monophasés ou polyphasés d'encombrement réduit
US2550500A (en) * 1948-09-24 1951-04-24 Gen Electric Low yoke transformer core
US2896182A (en) * 1955-09-17 1959-07-21 Pruneau Pierre Marie Magnetic circuits for stationary electrical induction apparatus
CH440442A (fr) * 1964-03-04 1967-07-31 English Electric Co Ltd Transformateur
NL6805831A (de) * 1967-04-27 1968-10-28

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE366467C (de) * 1923-01-08 Siemens Schuckertwerke G M B H Vorrichtung zur Vermeidung von Wirbelstroemen in Eisenteilen von Transformatoren oder Drosselspulen
US1610867A (en) * 1923-09-18 1926-12-14 Gen Electric Transformer
FR886135A (fr) * 1942-05-26 1943-10-06 Acec Transformateurs monophasés ou polyphasés d'encombrement réduit
US2550500A (en) * 1948-09-24 1951-04-24 Gen Electric Low yoke transformer core
US2896182A (en) * 1955-09-17 1959-07-21 Pruneau Pierre Marie Magnetic circuits for stationary electrical induction apparatus
CH440442A (fr) * 1964-03-04 1967-07-31 English Electric Co Ltd Transformateur
NL6805831A (de) * 1967-04-27 1968-10-28

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Brown et al., German App. No. 1,051,960 Publ. 3/5/59 *
Siemens et al., German App. No. 1,056,731 Publ. 5/6/59 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862393A (en) * 1971-08-20 1975-01-21 Humphreys Corp Low frequency induction plasma system
US3750070A (en) * 1971-11-30 1973-07-31 Westinghouse Electric Corp Pressure ring for transformer windings
US4496925A (en) * 1978-11-08 1985-01-29 E. Blum Gmbh & Co. Stepped iron core for static or dynamic electric machines
US4656452A (en) * 1985-11-08 1987-04-07 Rte Corporation Transformer telephone influence tractor core shunt
WO2001063636A2 (en) * 2000-02-23 2001-08-30 Abb Technology Ag Leakage flux protection for transformer clamping bar
WO2001063636A3 (en) * 2000-02-23 2002-01-10 Abb Transmit Oy Leakage flux protection for transformer clamping bar
JP2014216524A (ja) * 2013-04-26 2014-11-17 株式会社日立製作所 静止誘導電器
EP4040455A1 (de) 2021-02-05 2022-08-10 Hitachi Energy Switzerland AG Transformator mit wicklung
WO2022167622A1 (en) 2021-02-05 2022-08-11 Hitachi Energy Switzerland Ag Transformer comprising winding

Also Published As

Publication number Publication date
GB1270594A (en) 1972-04-12
SE338612B (de) 1971-09-13
NO124899B (de) 1972-06-19
DE1926720A1 (de) 1970-07-02
DE1926720B2 (de) 1972-02-17

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