EP2117019B1 - Modular device for clamping and positioning power transformer windings, particularly for a dry-type transformer with resin-encapsulated windings - Google Patents

Modular device for clamping and positioning power transformer windings, particularly for a dry-type transformer with resin-encapsulated windings Download PDF

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Publication number
EP2117019B1
EP2117019B1 EP08425162.8A EP08425162A EP2117019B1 EP 2117019 B1 EP2117019 B1 EP 2117019B1 EP 08425162 A EP08425162 A EP 08425162A EP 2117019 B1 EP2117019 B1 EP 2117019B1
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EP
European Patent Office
Prior art keywords
block
windings
base block
modular device
sides
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.)
Active
Application number
EP08425162.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2117019A1 (en
Inventor
Italo Bucci
Gaetano Cori
Lino De Lauretis
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.)
BTicino SpA
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BTicino SpA
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Publication date
Application filed by BTicino SpA filed Critical BTicino SpA
Priority to EP08425162.8A priority Critical patent/EP2117019B1/en
Priority to PL08425162T priority patent/PL2117019T3/pl
Publication of EP2117019A1 publication Critical patent/EP2117019A1/en
Application granted granted Critical
Publication of EP2117019B1 publication Critical patent/EP2117019B1/en
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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
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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
    • H01F27/327—Encapsulating or impregnating
    • H01F2027/328—Dry-type transformer with encapsulated foil winding, e.g. windings coaxially arranged on core legs with spacers for cooling and with three phases

Definitions

  • the present invention relates to a modular device for clamping and positioning power transformer windings, particularly for dry-type transformers with resin-encapsulated windings.
  • Power transformers are known to be generally formed of a sheet pack (magnet core) with two yokes clamped by yoke pressing plates and two or three columns.
  • Low and high voltage windings are concentrically arranged around the columns, the low voltage windings being interposed between the columns and the high voltage windings.
  • clamping devices shall have a certain controlled elasticity to absorb the different thermal expansion of the windings during operation and to damp vibrations, which will thence not be transferred to the whole structure.
  • clamping devices are generally employed which are specially designed to fit the size of the transformer and its windings, which size can be varied over wide ranges and involves highly variable insulation spacings and sizes of the clamping devices.
  • DE 20105608U which is regarded as the closest prior art
  • DE 20210882U disclose modular clamping devices, composed of a combination of different elements of insulating material.
  • Such spacers may also be used as transformer windings clamping devices, but are unsuitable to cope with the requirements imposed by the overall diameter of the concentric windings, which varies in a relatively wide range.
  • the present invention solves this problem and provides a modular sturdy system to form clamping devices that use, possibly multiple times, distinct elements that can be stacked and assembled like the bricks of the well-known LEGO (registered trademark) toy.
  • the system substantially comprises an elongate base block or support, a second substantially square element, that can be defined as a bolt holder, but also acts as a rubber pad holding element and as a support shim for a winding and a third element, similar to the second, that can be defined as a winding guide or centering element, which also acts as a rubber pad-holder and support shim for a winding.
  • the invention addresses the issue of providing clamping devices with a minimized number of different parts and the required rubber pads, that can fit transformers in which the diameter of the concentric windings varies in a relatively wide range and, by repeated use of the same part type, provide all the thicknesses required to ensure the required voltage-related insulation spacing and to allow the device to accommodate windings having different axial dimensions.
  • the particular conformation of the elements ensures a high surface electric resistance and does not affect the efficiency of the ventilation passages typically interposed between the primary and secondary windings, thanks to the provision of air flow passageways in the base block.
  • the base block 1 is a hollow rectangular parallelepiped element having a length K (e.g. 140 mm), a width W1 (e.g. 55 mm) and a thickness H1 (e.g. 18 mm), conveniently beveled at one end
  • the block 1 is formed by injection molding of a plastic material having high mechanical and dielectric strength, such as PBT (polybutilen terephthalate) and has two sides 2, 3 interconnected by a plurality of transverse ribs, such as the rib 4, which have either a vertical extension as shown in the sectional view of Figure 8 or are inclined to the vertical at least in the central part of the block, for reasons to be explained hereafter, as shown in Figure 9 .
  • PBT polybutilen terephthalate
  • the block structure is further reinforced by a pair of ribs 5, 6 extending parallel to the sides 2, 3.
  • the sides 2, 3 have a continuous upper toothing 7, 8, conveniently recessed (e.g. by 2.5 mm) relative to the lower part, which preferably has a triangular shape, tapered at its top, with a pitch of the order of 2 ⁇ 3 mm and a height H3 of the order of 3 mm.
  • the distance between the toothing crests of the two opposed toothings 7, 8 is W2 (approximately equal to W1 - 7 mm, i.e. in this example 48 mm).
  • the sides 2, 3 extend downwards further than the connecting and reinforcing ribs, to form a continuous housing, open at its ends, with a depth H3 equal to the height of the toothings 7, 8.
  • this housing also have toothings 9, 10 identical to the toothings 7, 8.
  • the distances between the troughs of the two opposed toothings 9, 10 is equal to W2.
  • the base block has identical upper and lower transverse interlocking profiles.
  • the bolt holding element 11 is also a parallelepipedal block, having substantially square top and bottom faces and a width exactly equal to the width W1 of the base block.
  • the height H2 of the parallelepiped may be equal (18 mm) to or conveniently lower (e.g. 15 mm) than that of the base block.
  • the bolt holding block also has identical upper and lower transverse profiles, which are also identical to those of the base element, with two sides 12, 13 having an upper external toothing 14, 15, which is also identical to that of the sides of the base element.
  • sides 12, 13 extend downwards to form a housing open at its ends, with toothed sides, having the same transverse dimension W2 and depth H3 as the upper profile of the base block and of the bolt holding element itself.
  • the bolt holding block has a closed bottom 16 and stiffening ribs 17 that form a hexagonal prismatic housing 18, open at its top face, for accommodating the head of a clamping bolt commonly used in transformers for exerting an adequate and controlled pressure on the windings.
  • the closed bottom 16 not only provides a support for the clamping bolt head but also helps in stiffening the element.
  • the bolt holder may be coupled to the base block in the most appropriate position for clamping.
  • the guide element has a ribbed flap 20 at one end, which extends from the bottom 21 of the lower housing, perpendicular to the latter.
  • the various elements may be used on either the upper or lower side of the windings and may be also mounted in the transformer in reverse or upturned positions.
  • Clamping of windings requires the provision of resilient members for damping vibrations (generated by alternate excitation of windings) and absorbing the thermal expansions that occur during operation.
  • these resilient members are rubber pads glued to the clamping devices and interposed between the latter and the windings.
  • the housings formed in the lower side of the bolt holding block and the guide element act as receptacles for positioning and stable retention of resilient pads having a transverse dimension L1 slightly larger than the width W2 of the housings.
  • One of these pads substantially having the shape of a rectangular parallelepiped, and a thickness related to the requested elastic constant is shown in Figure 7 and designated by numeral 22.
  • the dashed arrow 23 indicates the direction of insertion of the pad 22 into the guide element 19 of Figure 6 , although it will be understood that the same pad may be inserted in the lower housing of the bolt holding block (see Fig. 4 ), which is used in this case as a simple rubber pad holding block or, if needed, may be also inserted in the lower housing of the base block 1.
  • the continuous and uniform section of the pad allows it to be obtained from a cut-to-size extruded strip, thereby simplifying the manufacturing process.
  • Figure 13 shows a partial perspective view of an embodiment of the above elements that are used for forming compound devices for clamping the windings of a transformer, with the windings being arranged coaxial with the columns of the magnet core.
  • Figure 13 shows that the upper and lower yokes of the transformer are respectively clamped by a magnet keeper that is formed, as is known, of a pair of yoke-pressing plates consisting of beams or C-sections 24, 25 and 26, 27 connected together by tie rods.
  • the angle bars 28, 29 of the lower yoke-pressing plates act as supports for a plurality of (generally four per column) clamping devices (only two of them 30, 31 being shown herein) evenly distributed around the columns and radially oriented relative to the axis of the columns.
  • angle bars 32, 33 of the upper yoke-pressing plates act as retainers for a plurality of (generally four per column) pressing bolts (only two of them 34, 35 being shown herein) which exert a convenient force upon corresponding clamping devices 36, 37 placed above the windings.
  • Figure 13 shows an external medium/high voltage primary winding 38 in the transformer and an internal low voltage secondary winding formed of two coaxial windings 39, 40.
  • the low voltage windings 39, 40 have a larger axial size than the medium/high voltage winding.
  • the upper clamping device 37 (and the device 36) is composed of the following elements, from top to bottom:
  • the lower clamping device 31 (and the device 30) is composed (from bottom to top) of the following elements, disposed in a reverse direction with respect to those used in the previous figures:
  • the bolt holder and the guide element are thinner than the base element, then the difference will be very small (such as 3 mm) and may be eliminated, if needed, by replacing, in the lower clamping device, the base block 51 with two bolt holding blocks interposed between the base block 50 and the pad 52 on the one hand and between the base block 50 and the guide element 53 on the other.
  • the base block 48 may be replaced by a bolt holder to be laid on the angle bar 28.
  • the first alternative is preferable for stability reasons.
  • the bolt holder 41 should be placed in a radially intermediate position between the two windings.
  • the present device may be used with windings whose radial dimension is larger than the length of the base blocks.
  • the base block/s can simply have a pair of bolt holding elements coupled thereto, partially stacked above the base block and projecting out of its ends, as allowed by the interlocking toothing, with the only condition that the stress center is contained in the base block.
  • a bolt holding block may be seamlessly coupled to a bolt holding block, the pair being retained by a base block in stacked relationship to both (like in the shift joints technique used in masonry).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Coils Or Transformers For Communication (AREA)
EP08425162.8A 2008-03-17 2008-03-17 Modular device for clamping and positioning power transformer windings, particularly for a dry-type transformer with resin-encapsulated windings Active EP2117019B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08425162.8A EP2117019B1 (en) 2008-03-17 2008-03-17 Modular device for clamping and positioning power transformer windings, particularly for a dry-type transformer with resin-encapsulated windings
PL08425162T PL2117019T3 (pl) 2008-03-17 2008-03-17 Modułowe urządzenie do zaciskania i pozycjonowania uzwojeń transformatora mocy, przeznaczone w szczególności do transformatora suchego z uzwojeniami zatopionymi w żywicy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08425162.8A EP2117019B1 (en) 2008-03-17 2008-03-17 Modular device for clamping and positioning power transformer windings, particularly for a dry-type transformer with resin-encapsulated windings

Publications (2)

Publication Number Publication Date
EP2117019A1 EP2117019A1 (en) 2009-11-11
EP2117019B1 true EP2117019B1 (en) 2014-05-07

Family

ID=39675373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08425162.8A Active EP2117019B1 (en) 2008-03-17 2008-03-17 Modular device for clamping and positioning power transformer windings, particularly for a dry-type transformer with resin-encapsulated windings

Country Status (2)

Country Link
EP (1) EP2117019B1 (pl)
PL (1) PL2117019T3 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105788831A (zh) * 2016-05-23 2016-07-20 江苏中容科技有限公司 一种带有组合式垫块的干式变压器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP2626872A1 (en) * 2012-02-13 2013-08-14 ABB Sp.zo.o. Transformer windings support
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
EP4687161A1 (en) * 2024-07-31 2026-02-04 Hitachi Energy Ltd Coil arrangement, transformer and method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1115025A (en) * 1964-12-04 1968-05-22 Ass Elect Ind Improvements in or relating to winding spacing means of electrical transformers
DE20105608U1 (de) * 2001-03-27 2001-11-08 Siemens AG, 80333 München Abstützvorrichtung für ein elektrisches Bauteil in Form einer Spule
FR2830369B1 (fr) * 2001-09-28 2003-12-26 Pioch Sa Cale de bobine pour transformateur et transformateur la comportant
DE20210882U1 (de) * 2002-07-12 2002-10-10 Siemens AG, 80333 München Abstützvorrichtung zur Abstützung von zumindest einer Wicklung
DE102005030014B3 (de) * 2005-06-17 2006-11-30 Ismet Ag Windungsseparierungselement zum Separieren von Windungen einer Spule, und zugehörige Spule, insbesondere Transformatorspule

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105788831A (zh) * 2016-05-23 2016-07-20 江苏中容科技有限公司 一种带有组合式垫块的干式变压器

Also Published As

Publication number Publication date
PL2117019T3 (pl) 2014-09-30
EP2117019A1 (en) 2009-11-11

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