EP1298681A1 - Keil für Transformatorspule und Transformator mit einem solchen Keil - Google Patents

Keil für Transformatorspule und Transformator mit einem solchen Keil Download PDF

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Publication number
EP1298681A1
EP1298681A1 EP02291892A EP02291892A EP1298681A1 EP 1298681 A1 EP1298681 A1 EP 1298681A1 EP 02291892 A EP02291892 A EP 02291892A EP 02291892 A EP02291892 A EP 02291892A EP 1298681 A1 EP1298681 A1 EP 1298681A1
Authority
EP
European Patent Office
Prior art keywords
complementary
wedge
coil
stud
transformer
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.)
Withdrawn
Application number
EP02291892A
Other languages
English (en)
French (fr)
Inventor
Olivier Pioch
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.)
Pioch SA
Original Assignee
Pioch SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pioch SA filed Critical Pioch SA
Publication of EP1298681A1 publication Critical patent/EP1298681A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a coil shim for a transformer. intended to be interposed between the end of a coil and an element of structure of the transformer, of the type comprising a first bearing surface on the coil and a second opposite bearing surface on the structure of the transformer.
  • High power electrical transformers generally include several cylindrical coils arranged one next to the other.
  • a carcass defines a closed magnetic circuit along which the coils are arranged.
  • the carcass has columns axially engaged at inside each of the coils.
  • metal beams Between both sides of the carcass sections connecting the columns engaged in the coils are arranged metal beams between which the coils are enclosed, in order to prevent them from move axially along the length of the columns passing through them.
  • the coils are supported on these beams at each of their ends.
  • insulating shims generally made of plastic material to avoid any play between the coils and the side members.
  • the gap to be filled between the end coils and side members arranged opposite is variable.
  • the object of the invention is to propose bobbin wedges for transformer. and a transformer incorporating them, the cost of which is reduced.
  • the invention relates to a coil shim for a transformer of the aforementioned type, characterized in that it comprises adjustable means for opposing bearing surfaces adapted to hold the two bearing surfaces spaced apart according to at least two distinct configurations in which the intervals repairing the two bearing surfaces are different.
  • the invention further relates to a transformer comprising at at least one coil and at least one structural element, characterized in that it comprises at least one coil shim as defined above, arranged between one end of the or each coil and the or each structural element.
  • a three-phase transformer 10 This comprises three coils 12A, 12B, 12C of generally cylindrical shape extending parallel to each other. These coils are arranged in the same plan.
  • the transformer has a magnetic circuit 14, comprising three columns 16A, 16B, 16C engaged axially in the coils 12A, 12B, 12C. These columns are connected to each other by lower and upper cylinder heads 18 of which only one is shown in FIG. 1.
  • Longers 20 are arranged on either side of the following cylinder heads their length.
  • the coils 12A, 12B, 12C are held axially fixed along the length of the columns 16A, 16B, 16C being sandwiched between the side members 20 opposites.
  • shims 22 are arranged according to the invention.
  • FIG. 2 Such a wedge is shown in exploded perspective in FIG. 2, and in end view, with partial cutaway in Figure 3.
  • All the shims of a transformer are identical. They are made entirely made of plastic. They have a support surface 24 on the edge of a coil and a support surface 26 on the surface of the spar 20 facing the coil.
  • a damping pad for example silicone is interposed between the bearing surface 24 and the end of the coil.
  • These two opposite bearing surfaces 24, 26 generally extend parallel to each other and are spaced from each other by a predetermined interval corresponding to the desired distance between the end of the spool and the associated spar.
  • each wedge 22 comprises adjustable means 28 for spacing opposite bearing surfaces 24, 26 adapted to maintain the two spaced apart surfaces according to at least two distinct configurations in which the intervals separating the two bearing surfaces are different.
  • the support surface 24 on the end of the coil is defined on a first body 30 of the wedge while the surface 26 of bearing on the beam 20 is defined on a second body 32 of the wedge itself consisting of a set of parts as shown in figure 2.
  • first and second bodies 30 and 32 have profiles of complementary sockets suitable for interlocking of the two bodies with each other in at least two relative positions, thereby ensuring adjustment the spacing of the opposite bearing surfaces 24, 26.
  • the first body 30 comprises a flat plate 34 one face of which forms the bearing surface 24.
  • This bearing surface is bordered by a dimensioned by a rim 36 made of material and adapted to bear on the surface inner side of the coil, for example 12A.
  • the body 30 comprises a stud 38 projecting relative to the surface of the plate 34 on the side opposite to the bearing surface 24.
  • This stud 38 extends in the median part of the plate 34 over most of its length, this length extending along the radius of the coil.
  • the stud 34 has, at its top, a flat surface 40 and, laterally, two opposite side surfaces 41 extending parallel to one another the other. These lateral surfaces 41 extend along the length of the plate 34, perpendicular to the flange 36 bearing on the coil. When the wedge is mounted on the coil, the lateral surfaces 41 extend substantially radially relative to the coil.
  • the surfaces 41 have nesting profiles suitable for cooperate with the complementary body 32 of the wedge.
  • these profiles interlocking have longitudinal grooves 42 extending along the entire length of the stud 38. These grooves generally extend parallel to the bearing surface 24.
  • each rib delimiting the grooves 42 has two opposite flanks made up of surfaces planar.
  • a first sidewall 42A opposite the bearing surface 24 extends essentially parallel to this bearing surface.
  • the second side 42B is inclined by relative to the bearing surface 24.
  • the grooves define a set of sides 42A parallel to the bearing surface 24 and staggered one above the other. These sides 42A form bearing surfaces for the second body 32.
  • the number of ribs delimited by these grooves is comprised of preferably between 2 and 10 and is advantageously substantially equal to 5.
  • the pitch of these grooves is between 0.5 and 2 millimeters.
  • Complementary interlocking profiles 44 are provided on the second body 32 of the hold.
  • the latter comprises a spacer 46 and a support pad 48 on which is provided the bearing surface 26.
  • This support pad itself is constituted a base 50 and a cross member 52.
  • the spacer 46 generally has the form of a trigger guard and delimits a yoke 54.
  • the trigger guard 54 has two lips 56 connected to each other by a crosspiece 58.
  • the interlocking profiles 44 are delimited on the lateral surfaces interior of the lips, that is to say on their facing surfaces.
  • These profiles socket consist of grooves extending parallel to the crosspiece 58. These grooves have additional characteristics to the grooves 42 carried by the side walls of the stud 38. They extend along surfaces parallel.
  • each rib delimiting the grooves comprises a support side 44A opposite the support surface 26.
  • This support side extends parallel to the bearing surface 26. It is adapted to rest on a side complementary support 42A of the grooves of the first body 30.
  • each groove has a side 44B inclined relative to the bearing surface 26.
  • the length of the spacer measured in the direction of the grooves is equal to the length of the stud 38 also measured in the direction of the splines.
  • the outer lateral surfaces 60 formed on the lips 56 of the spacer are inclined relative to each other and converge towards each other following the direction of the cross 58.
  • the base 50 has a base 62 generally square.
  • One of the faces of the base is hollowed out and delimits a bowl 64 partial reception of the spacer 46 and in particular of a part thereof engaged around stud 38.
  • This bowl 64 has a flat bottom 66, bordered by four side walls. Two opposite side walls 68 extend parallel to each other. Their spacing is equal to the length of the spacer 28 measured in the direction grooves.
  • the bowl is further delimited by two lateral surfaces opposite planes 70 having parallel generatrices. These surfaces are tilted and converge towards each other towards the bottom of the bowl. The inclination of the surfaces 70 is identical to the inclination of the surfaces 60 of the spacer.
  • the base 50 includes a pillar 72 for connecting the cross member 52.
  • This pillar protrudes from the base 62 in the center of its face opposite to that in which is provided the bowl 64.
  • the pillar 72 has laterally grooves 74. These grooves generally extend along the height of the pillar.
  • the cross member 52 has a channel 76 delimited by two side walls 78 parallel to each other.
  • the surfaces 80 facing the two side walls 78 have grooves 82 complementary to the grooves 74.
  • the bearing surface 26 is formed on the crosspiece 52 opposite the channel 76.
  • the distance between the bearing surfaces 24 and 26 is defined.
  • the spacer 46 is engaged on the pad 38 as illustrated in Figure 3.
  • the spacing of the spacer 46 and the surface 24 is adjusted by choosing the relative position of the grooves 42, 44 engaged one in the other, and in particular by engaging a determined number of protruding profiles and in complementary hollow.
  • the spacer 46 is put in place by sliding relative to the first body 30 in the direction defined by the complementary grooves 42, 44.
  • the base 50 is then placed on the spacer 46 in order to partially cover it.
  • the spacer is then partially received in the bowl 64.
  • the surfaces 60 and 70 are applied one on the other side, while the lateral surfaces 68 extend opposite the opposite open ends of screed 54.
  • the cross member 52 is finally positioned on the base 50 by engagement complementary grooves 74, 80.
  • the position of the cross member 52 is chosen by engagement of the stud 72 at the desired location in the groove 76.
  • the spacer 46 is held on the pad 38 and cannot be released from it. Indeed, the surfaces 68 of the bowl, extending opposite the ends not grooved stud 38 constitute stops preventing any movement of the spacer 46 relative to the first body 30 in the direction of the grooves 42, 44.
  • the surfaces 70 constitute stops ensuring a maintenance engaging complementary grooves 42, 44.
  • the surfaces 60 and 70 being inclined, these form cam and cam follower surfaces which, under the action of the bringing together of the two surfaces 24, 26, tend to urge the lips 56 of the spacer toward each other and thus ensure even stronger engagement grooves 42, 44.
  • Such coil shims allow the spacing between the Opposite bearing surfaces. This setting is obtained by choosing the number of splines engaged. So these shims can be used in different types of transformers, without the need for each type of transformer to make a new specific block.
  • the manufacturing cost of the transformer is thus reduced.
  • Figures 5 and 6 show elements of a variant for producing a wedge according to the invention.
  • a first body marked 130 visible in FIG. 5 is intended to be used replacing the first body 130 of the wedge illustrated in FIGS. 2 to 4.
  • a spacer 146 intended to be used as a replacement spacer 46.
  • FIGS. 5 and 6 the elements identical or analogous to those of first embodiment are designated by the same reference number to which has been added 100.
  • the first body 130 differs from the body 30 only in the shape of the pad 38 protruding from the surface of the plate 134.
  • the stud 138 has a cylindrical lateral surface 202. The axis of this surface cylindrical extends perpendicular to the bearing surface 124 of the wedge on the end of the spool.
  • the lateral surface 202 has annular grooves 142 extending along the entire periphery of the stud. These grooves generally extend parallel to the bearing surface 124. They each have an identical shape the shape of the grooves made on the pad 38.
  • the spacer 146 has like the spacer 46, two lips 156 extending generally parallel to each other. These lips have on their facing surfaces, substantially in their middle parts, 204 depressions defined by cylindrical surfaces opposite 206. These cylindrical surfaces 206 are generated by a same generator and constitute parts of a cylinder extending perpendicularly at cross member 158 of the spacer. They delimit a housing of revolution suitable for receiving stud 138. For this purpose, the diameter of the cylinder defined by the surface 206 is equal to the diameter of the pad 138.
  • the internal surfaces of the lips 156 have, according to all their lengths of the grooves 144. These grooves extend over the cylindrical surfaces 206.
  • These grooves have shapes identical to the grooves 44 and extend parallel to each other.
  • the crosspiece 158 has a central orifice 210 through from which a depression 204 is visible.
  • the first body 130 and the spacer 146 are intended to be used with a base 50 and a cross member 52 as illustrated in FIG. 2.
  • the spacer 146 When mounting the shim and adjusting its thickness, the spacer 146 is engaged on the pad 138. To do this, the pad 138 is introduced between the spacer lips 156. Ribs 142 are engaged with a number complementary ribs 144 corresponding to the desired distance between the two opposite surfaces of the wedge.
  • the two lips 156 gradually move apart by elastic deformation cross member 158 to allow movement of the pad 138. This pad is displaced, along the length of the ribs until it is received in the depressions 204.
  • the lips 156 relax, since they are not no longer subject to a constraint aimed at removing them due to the presence of the stud 138.
  • the complementary ribs formed on the stud and on the surfaces cylindrical 206 remain in engagement, thus ensuring an axial positioning of the first body 130 and spacer 136.
  • the base 50 is then engaged on the spacer 146 in order to ensure, by effect wedge and as previously explained, a bringing together of the two lips 156 thus tending to accentuate the cooperation of complementary grooves. Finally, the cross member 52 is placed on the base 50.
  • the pad 138 is susceptible to be moved in rotation relative to the spacer 146 around the axis of the stud.
  • the pad 138 is held axially between the two depressions 204 with a cylindrical surface, the concavities of the cylindrical surfaces 206 and the lateral surface 202 of the stud being identical.
  • the crosspiece 52 can be positioned angularly relative to the first body applied to the end of the coil, facilitating thus mounting the transformer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
EP02291892A 2001-09-28 2002-07-25 Keil für Transformatorspule und Transformator mit einem solchen Keil Withdrawn EP1298681A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0112549A FR2830369B1 (fr) 2001-09-28 2001-09-28 Cale de bobine pour transformateur et transformateur la comportant
FR0112549 2001-09-28

Publications (1)

Publication Number Publication Date
EP1298681A1 true EP1298681A1 (de) 2003-04-02

Family

ID=8867750

Family Applications (1)

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EP02291892A Withdrawn EP1298681A1 (de) 2001-09-28 2002-07-25 Keil für Transformatorspule und Transformator mit einem solchen Keil

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EP (1) EP1298681A1 (de)
FR (1) FR2830369B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2117019A1 (de) * 2008-03-17 2009-11-11 Elettromeccanica di Marnate S.p.A. Modulare Vorrichtung zum Festklemmen und Positionieren der Wicklungen von Leistungstransformatoren, insbesondere für einen Trockentransformator mit in Giessharz eingebetteten Wicklungen
ITMI20111618A1 (it) * 2011-09-08 2013-03-09 Tmc Italia S P A Dispositivo di pressaggio per un trasformatore elettrico a secco isolato in resina
IT201800003584A1 (it) * 2018-03-15 2019-09-15 Andrea Giorgio Colombo Organo di fissaggio per un dispositivo di pressaggio per un trasformatore elettrico a secco isolato in resina

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114823096B (zh) * 2022-06-25 2022-10-21 深圳市万志宇科技有限公司 一种具有防漏电功能的电子变压器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009461A (en) * 1975-07-24 1977-02-22 General Electric Company Externally actuated clamping system for transformer windings incorporating a mechanical follow-up device
USH906H (en) * 1990-06-04 1991-04-02 The United States Of America As Represented By The United States Department Of Energy Wedge assembly for electrical transformer component spacing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009461A (en) * 1975-07-24 1977-02-22 General Electric Company Externally actuated clamping system for transformer windings incorporating a mechanical follow-up device
USH906H (en) * 1990-06-04 1991-04-02 The United States Of America As Represented By The United States Department Of Energy Wedge assembly for electrical transformer component spacing

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2117019A1 (de) * 2008-03-17 2009-11-11 Elettromeccanica di Marnate S.p.A. Modulare Vorrichtung zum Festklemmen und Positionieren der Wicklungen von Leistungstransformatoren, insbesondere für einen Trockentransformator mit in Giessharz eingebetteten Wicklungen
ITMI20111618A1 (it) * 2011-09-08 2013-03-09 Tmc Italia S P A Dispositivo di pressaggio per un trasformatore elettrico a secco isolato in resina
EP2568485A1 (de) * 2011-09-08 2013-03-13 TMC Italia S.p.A. Pressvorrichtung für einen Harz-vergossenen Trockentransformator
IT201800003584A1 (it) * 2018-03-15 2019-09-15 Andrea Giorgio Colombo Organo di fissaggio per un dispositivo di pressaggio per un trasformatore elettrico a secco isolato in resina
EP3540749A1 (de) * 2018-03-15 2019-09-18 Andrea Giorgio Colombo Halteelement für eine pressvorrichtung für einen trockenen elektrischen transformator aus giessharz

Also Published As

Publication number Publication date
FR2830369B1 (fr) 2003-12-26
FR2830369A1 (fr) 2003-04-04

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