EP1614127B1 - Traversee pour transformateurs - Google Patents

Traversee pour transformateurs Download PDF

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Publication number
EP1614127B1
EP1614127B1 EP04725949A EP04725949A EP1614127B1 EP 1614127 B1 EP1614127 B1 EP 1614127B1 EP 04725949 A EP04725949 A EP 04725949A EP 04725949 A EP04725949 A EP 04725949A EP 1614127 B1 EP1614127 B1 EP 1614127B1
Authority
EP
European Patent Office
Prior art keywords
insulating body
bushing
transformer
annular gasket
pin
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.)
Expired - Lifetime
Application number
EP04725949A
Other languages
German (de)
English (en)
Other versions
EP1614127A1 (fr
Inventor
Gian Franco Giorgi
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.)
Cedaspe SpA
Original Assignee
Cedaspe SpA
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 Cedaspe SpA filed Critical Cedaspe SpA
Priority to PL04725949T priority Critical patent/PL1614127T3/pl
Publication of EP1614127A1 publication Critical patent/EP1614127A1/fr
Application granted granted Critical
Publication of EP1614127B1 publication Critical patent/EP1614127B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements

Definitions

  • the present invention concerns a bushing for electrical distribution transformers with mineral oil insulation.
  • the bushings of known type comprise two ceramic bodies which, once assembled, are held together and fixed to the transformer wall by means of a threaded pin which passes through them longitudinally, and appropriate washers and tightening nuts.
  • One of the two ceramic bodies is on the outer side of the wall that separates the inside of the transformer from the outside; the other ceramic body is located on the inner side of the wall and, during operation, is immersed in the cooling oil of the transformer; the two ceramic bodies are held together by means of a pin which passes through the two bodies, and tightly packed by means of tightening nuts.
  • said gaskets are generally flat or toric annular gaskets with semicircular section, of appropriate dimensions, which are tightly packed between the ceramic bodies and the transformer wall, or between the ceramic body and any washers, nuts or other elements compacted together by means of a central pin in order to form the assembled bushing; as a result of the compacting compression, said gaskets expand towards the outside where, in contact with the sunlight, and also as a result of the compacting pressure, they deteriorate fairly rapidly, losing their elasticity, undergoing permanent plastic deformation, becoming thin, cracking and no longer guaranteeing a good seal; this deterioration is emphasised by the fact that normally, for oil bath transformers, manufacturers prefer to use nitrile rubber which, although on the one hand is more suitable than other types of rubber to check oil leaks, on the other is more rapidly deteriorated by the sunlight and ultraviolet rays.
  • US-A-5623125 discloses a bushing insulator to be applied between an electrical conductor and a tank of an electrical transformer, extends through an orifice in a wall of the transformer, and comprises a body positioned on a first side of the wall and a cover positioned on a second side of the wall, with fasteners used to clamp the wall between the body and the cover.
  • the cover also includes a stepped cylindrical opening at an end of the cover opposite from the end of the cover that seals against the wall, with the stepped cylindrical opening containing a gasket in its smaller diameter portion for radially sealing against the output post, and a stepped spacer that is partially contained within the smaller diameter portion and partially contained within the larger diameter portion of the stepped cylindrical opening.
  • EP-A-0971378 discloses a bushing insulator, comprising a part to be exposed to the air which is coupled to a part to be arranged inside the tank.
  • the parts are crossed axially by a tie which acts as an electrical conductor.
  • the part to be exposed to the air comprises, packed on the tie, a hood, an annular gasket, an external insulating body and a gasket to be arranged between the insulating body and the tank of the transformer at an opening provided therein.
  • the aim of the present invention is to provide an improvement in the bushings for electrical transformers with mineral oil cooling, of known type, with particular reference to deterioration of the seal gaskets.
  • a bushing suitable for being used as electrical input and/or output of a transformer with fluid insulation comprising: a first electrically insulating body suitable for being positioned outside the transformer and fixed on a wall of the transformer which separates the outside from the inside; at least one annular gasket between said first electrically insulating body and said wall; a packing system suitable for fixing the first electrically insulating body on the transformer wall and tightly packing the at least one annular gasket together with the first electric insulating body and the transformer wall; an annular groove positioned crosswise to a pin inserted in a through hole in said first electrically insulating body for housing the at least one annular gasket; the said first electrically insulating body further comprising at least one protecting edge that externally surrounds said at least one annular gasket and is suitable for enclosing and protecting the at least one annular gasket from the sunlight when the bushing is installed and tightly packed, characterized in that said at least one
  • Figure 1 shows a schematic view, partially in section, of a bushing for oil-cooled transformers according to the present invention
  • Figure 1 shows, side by side, a first embodiment of a pin which terminates at the lower end like a normal conductor (on the left in Figure 1 ) and a second embodiment of a pin that terminates like a "spade" connector (on the right in Figure 1 );
  • Figure 1 shows a side view, partially in section, of a preferred but non-limiting embodiment of a bushing for obtaining the electrical input and/or output of a transformer with oil insulation according to the present invention.
  • Said bushing comprises an electrically insulating ceramic body 1, -hereinafter also referred to as first electrically insulating body 1- suitable for being positioned on the outer side of the wall P of the transformer which separates its inside from the outside, and another insulating body 2, indicated hereinafter as third insulating body 2 and suitable for being positioned on the side of the wall P inside the transformer; inside the ceramic body 1 and the third insulating body 2 a first and a second hole are provided respectively through which a threaded pin 3 is inserted, which passes through the entire bushing and comes out of both ends of it.
  • the bushing of Figure 1 is fixed to the wall P of the transformer, placing between the wall P and the ceramic body 1 a first annular gasket 9 ( Figures 1, 1A ) which is compressed by the ceramic body 1 tightly packed against the wall itself;
  • Figure 1 B shows schematically a detail of the area of the first annular gasket 9 compressed and tightly packed to the bushing installed.
  • the threaded pin 3 and the fastening nut 4 can be replaced with other suitable packing systems, suitable for packing together the ceramic body 1 and the annular gasket 9, and for fixing the whole bushing to the transformer wall P, and/or the ceramic body 1 can be replaced with an electrically insulating body 1 made also of non ceramic materials.
  • the ceramic body 1 is provided with:
  • annular groove 10 and the first protecting edge 11 when the bushing is tightly packed and installed on the wall P, are suitable for enclosing and protecting the first annular gasket 9 from the sunlight.
  • the annular groove 10 and the edge 11 furthermore are shaped in order to limit the radial expansion of the first annular gasket 9 when it is compressed, avoiding excessive stress, cracking or plasticisation of the gasket rubber.
  • the protection against sunlight provided by the groove 10 and the edge 11 further contribute to reducing deterioration of the material of the first annular gasket 9.
  • the first annular gasket 9, without deformation is substantially torus-shaped with quadrangular transverse sections with convex sides ( Figure 1A ), where quadrangular shape means, for example, an approximately square or rectangular shape.
  • the convexity of the sides of the sections of the first annular gasket 9 means that, with respect to a toroidal gasket with rectangular or square transverse sections with straight sides (rubber washer), the pressure of the gasket 9 against the wall P is more concentrated in the middle of the sides of the gasket guaranteeing a better seal, while with respect to a toroidal gasket with circular transverse sections (for example like a large O-ring), with the same compression and sealing force, there is less radial expansion of the gasket compressed towards the outside and a more uniform distribution of the compression in the gasket body.
  • the first annular gasket comprises a number of centring protrusions 12 - for example blades, semispherical bosses, pins, protuberances or lobes of various shape - which protrude towards the inside of the ring defined by it in order to maintain the first annular gasket 9 positioned with respect to the ceramic body 1, when the bushing has not yet been assembled or prior to installation, with nil tolerances (i.e.
  • the Applicant has left a radial gap of between approximately 0 mm and 0.5 mm between the centring protrusions 12 and the ceramic body 1, whereas according to the state of the art the radial play between the circular hole of a rubber washer and the ceramic body, due to the high ceramic working tolerances, is usually not below approximately ⁇ 10% of the diameter of the hole, i.e. ⁇ 1.4 mm for a hole with diameter 28 mm.
  • a toroidal gasket is used - the transverse sections of which are a semicircumference - which is compressed, in a direction parallel to the pin 3, positioning it between two metal bodies inserted onto the same pin 3 and tightly packed: in this way the gasket expands radially pressing against the circumference of the pin 3.
  • each of the above-mentioned two bodies inserted on the pin 3 with the toroidal gasket of known type is generally a truncated cone-shaped or in any case flared recess which, if made directly on the end of the ceramic body 1, would be much more expensive than on the two metal bodies inserted on the same pin 3; this makes it necessary to fit a further gasket - generally a flat rubber washer - between one of the two metal bodies inserted on the same pin 3 and the ceramic body 1.
  • the bushing furthermore comprises ( Figures 1,1C ):
  • the outer second body 5 defines a second annular protecting edge 8 ( Figure 1 C) which extends in a longitudinal or parallel direction to the pin 3 in order to protect the second annular gasket 7 from the sunlight when the bushing is installed and tightly packed, reducing deterioration of the gasket material.
  • Figure 1D shows a detail of the area of the gasket 7 when the bushing is installed and tightly packed: the slanting surface 6 encloses and compresses the second annular gasket 7 both around and against the pin 3 and against the supporting surface 13 which is provided on the end of the ceramic body 1 facing towards the outside of the transformer and lies substantially crosswise to the pin 3; preferably, as in the embodiment example shown, the second annular gasket, without deformation, is substantially torus-shaped with circular transverse section ( Figure 1C ).
  • the second annular gasket 7 provides a double seal against oil leaks, preventing oil seeping around the pin 3 along the through hole of the ceramic body 1 and also preventing oil seeping into the passage between the supporting surface 13 and the outer second body 5, reducing the number of components with respect to the state-of-the-art bushings.
  • the slanting surface 6 prevents or however limits excessive radial expansion of the first annular gasket 7 when it is compressed, avoiding excessive stress in the gasket body and consequent cracking and fissuring.
  • the bushings of known type are provided with a third insulating body 2 suitable for being positioned on the side of the wall P inside the transformer ( Figures 1 , 4, 5 ).
  • the third insulating body 2 is made of plastic material, for example nylon: the plastic material can be tightly compressed by resting it directly against the wall P of the transformer without the need to insert intermediate rubber or cardboard gaskets.
  • a supporting flange 14 is provided on the third insulating body 2 suitable for being rested against said wall when the bushing is installed and tightly packed; advantageously the supporting flange 14 is provided with four straight sides 15 two by two substantially parallel suitable for aligning and positioning the third insulating body on the wall P of the transformer ( Figure 4 ).
  • knurling, thin ribbing or small bosses 16 can be provided on the upper contact surface of the flange 14, with which the flange 14 contacts the transformer wall P, for distributing the contact pressure between flange 14 and wall P of the transformer more uniformly.
  • a seat or recess 18 ( Figure 5 ) is provided - the example shows a seat 18 for a hexagon nut - which can house and couple a corresponding radially protruding part 19 of the pin 3 - in the example of Figure 1 , the hexagonal head 19 integral with or fixed to the threaded pin 3 - in order to block the related rotation of the pin 3 with respect to the insulating body 2.
  • the coupling between seat 18 and hexagon head 19 is particularly advantageous for quick accurate installation of the bushing if pins have to be used - like those shown in Figures 6, 7 - to obtain a so-called "spade connector" 20, known in the state of the art: in fact in some assembly cases spade connectors cannot be fitted in any direction - they must be accurately aligned with appropriate references.
  • the hexagonal head 19 permits accurate rapid alignment with respect to two of the positioning sides 15 of the flange 14, and permits accurate positioning of the spade connector 20 in six predefined angular positions.
  • the seat 18 can be shaped in order to receive and couple with heads 19 which can be not only hexagonal but also square, octagonal, splined couplings etc.
  • a bushing according to the present invention comprises:
  • the first annular gasket 9 can be a toroidal gasket with triangular transverse sections with convex sides;
  • the transformer not necessarily need to be provided with oil insulation, but can be insulated also with other dielectric liquids or fluids;
  • the supporting flange 14 can be provided in general with one or more sides 15 -not necessarily only four sides- or other positioning and orienting means suitable for allowing aligning, positioning and orienting the third insulation body 2 with respect to the transformer wall P; in general the pin 3 and the third insulating body 2 can be provided with respective orienting coupling zones or other suitable orienting means, suitable for engaging together or anyway blocking the rotation of the pin 3 with respect to the third insulating body 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Graft Or Block Polymers (AREA)
  • Coils Or Transformers For Communication (AREA)

Claims (12)

  1. Traversée adaptée pour être utilisée en tant qu'entrée et/ou sortie électrique d'un transformateur ayant un isolant fluide, ladite traversée comportant .
    - un premier corps électriquement isolant (1) adapté pour être positionné à l'extérieur du transformateur et fixée sur une paroi (P) du transformateur qui sépare l'extérieur de l'intérieur,
    - au moins un joint annulaire (9) situé entre ledit premier corps électriquement isolant (1) et ladite paroi (P),
    - un système de presse garniture (4, 5) adapté pour fixer le premier corps électriquement isolant (1) sur la paroi de transformateur (P) et conditionner de manière serrée le au moins un joint annulaire (9) en association avec le premier corps électriquement isolant (1) et la paroi de transformateur (P),
    - une gorge annulaire (10) positionnée transversalement par rapport à une tige (3) insérée dans un trou traversant dudit premier corps électriquement isolant (1) pour recevoir le au moins un joint annulaire (9),
    ledit premier corps électriquement isolant (1) comportant de plus au moins un bord de protection (11) qui entoure extérieurement ledit au moins un joint annulaire (9) et qui est adapté pour enfermer et protéger le au moins un joint annulaire vis-à-vis de la lumière solaire lorsque la traversée est installée et conditionnée de manière serrée, caractérisée en ce que ledit au moins un joint annulaire (9) a sensiblement la forme d'un tore ayant une section quadrangulaire ayant des côtés convexes, et comporte plusieurs saillies de centrage (12) qui font saillie vers l'intérieur de l'anneau défini par ledit joint annulaire.
  2. Traversée selon la revendication 1, dans laquelle le premier corps électriquement isolant est constitué d'une céramique.
  3. Traversée selon la revendication 1, dans laquelle ledit bord de protection et/ou éventuellement ladite gorge annulaire sont adaptés pour limiter l'agrandissement radial dudit au moins un joint annulaire lorsque la traversée est installée et conditionnée de manière serrée.
  4. Traversée selon la revendication 3, comportant au moins un deuxième corps (5), constitué de métal, adapté pour être positionné à l'extérieur de la paroi de transformateur, le au moins un deuxième corps comportant:
    - un second trou à travers lequel la tige (3) peut être insérée,
    - une surface inclinée (6) par rapport à la tige, et
    - un second bord de protection (8),
    ledit au moins un second joint annulaire (7) étant inséré sur la tige et conditionné de manière serrée entre le premier corps électriquement isolant (1) et la surface inclinée (6) du deuxième corps (5).
  5. Traversée selon la revendication 4, dans laquelle le au moins un second joint annulaire (7) est comprimé par la tige (3) et une surface de support (13) du premier corps électriquement isolant (1) et adhère à celle-ci, de manière à fournir un joint à la fois autour de ladite tige et contre ladite surface de support lorsque la traversée est installée et conditionnée de manière serrée.
  6. Traversée selon la revendication 4, dans laquelle le au moins un second joint annulaire (7) a sensiblement la forme d'un tore ayant une section circulaire.
  7. Traversée selon l'une quelconque des revendications 1 à 4, comportant de plus un troisième corps isolant (2), adapté pour être positionné à l'intérieur du transformateur sur la paroi de transformateur et définissant un second trou traversant, le troisième corps isolant étant constitué d'une matière plastique.
  8. Traversée selon la revendication 7, dans laquelle le troisième corps isolant comporte des moyens de positionnement et d'orientation adaptés pour permettre d'aligner, positionner et orienter le troisième corps isolant par rapport à la paroi de transformateur (P).
  9. Traversée selon la revendication 7, dans laquelle le troisième corps isolant comporte un rebord (14) adapté pour être en appui contre la paroi de transformateur (P) lorsque la traversée est installée et conditionnée de manière serrée, ledit rebord (14) comportant quatre côtés rectilignes (15) sensiblement parallèles deux à deux adaptés pour aligner, orienter et positionner le troisième corps isolant (2) sur la paroi de transformateur.
  10. Traversée selon la revendication 9, dans laquelle un moletage, un nervurage ou de petites protubérances (16) sont agencés sur la surface de contact du rebord (14), avec laquelle le rebord vient en contact et en appui contre la paroi de transformateur.
  11. Traversée selon l'une quelconque des revendications 7 à 10, dans laquelle une partie faisant radialement saillie est fixée sur ladite tige ou est d'un seul tenant avec celle-ci, la partie en saillie étant adaptée pour venir en contact avec un siège correspondant agencé sur ledit troisième corps isolant afin de bloquer la rotation de ladite tige par rapport audit troisième corps isolant.
  12. Traversée selon la revendication 11, dans laquelle ladite partie faisant saillie radialement comporte un écrou ou une tête hexagonale, et ledit siège correspondant agencé sur ledit troisième corps isolant est un siège sensiblement hexagonal.
EP04725949A 2003-04-07 2004-04-06 Traversee pour transformateurs Expired - Lifetime EP1614127B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04725949T PL1614127T3 (pl) 2003-04-07 2004-04-06 Przepust transformatorowy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000678A ITMI20030678A1 (it) 2003-04-07 2003-04-07 Isolatore per trasformatori
PCT/EP2004/050452 WO2004090917A1 (fr) 2003-04-07 2004-04-06 Traversee pour transformateurs

Publications (2)

Publication Number Publication Date
EP1614127A1 EP1614127A1 (fr) 2006-01-11
EP1614127B1 true EP1614127B1 (fr) 2008-05-14

Family

ID=33156338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04725949A Expired - Lifetime EP1614127B1 (fr) 2003-04-07 2004-04-06 Traversee pour transformateurs

Country Status (8)

Country Link
EP (1) EP1614127B1 (fr)
AT (1) ATE395710T1 (fr)
DE (1) DE602004013755D1 (fr)
ES (1) ES2307004T3 (fr)
IT (1) ITMI20030678A1 (fr)
PL (1) PL1614127T3 (fr)
PT (1) PT1614127E (fr)
WO (1) WO2004090917A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103413659A (zh) * 2013-09-02 2013-11-27 丹阳市金诺电器有限公司 一种组合式1kv级变压器套管
EP3410448A1 (fr) 2017-06-01 2018-12-05 Preis & Co Ges.m.b.H. Kit pour un dispositif de traversée

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVI20060166A1 (it) * 2006-06-05 2007-12-06 Comem Spa Isolatore passante per trasformatori elettrici
CN104332308B (zh) * 2012-03-31 2017-06-20 指明集团有限公司 工序较少的电力电容器
KR200481117Y1 (ko) * 2015-06-25 2016-08-17 (주)우강산업전기 변압기용 부싱의 밀폐구조
AT518819A1 (de) * 2016-07-07 2018-01-15 Preis & Co Ges M B H Dichtung für eine Durchführung an einem Transformator mit Fluidisolierung
EP3731247B1 (fr) 2019-04-24 2021-11-10 Preis & Co Ges.m.b.H. Ensemble pour un dispositif de passage permettant de connecter électriquement une installation de transformateur
CN113871970B (zh) 2021-09-06 2023-01-24 中国南方电网有限责任公司超高压输电公司贵阳局 一种具有双点接地的末屏端子

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2719150B1 (fr) * 1994-04-21 1996-06-07 Pioch Sa Passe-tige, notamment pour transformateur.
IT245076Y1 (it) * 1998-07-09 2002-03-19 Comem Spa Isolatore passante perfezionato.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103413659A (zh) * 2013-09-02 2013-11-27 丹阳市金诺电器有限公司 一种组合式1kv级变压器套管
CN103413659B (zh) * 2013-09-02 2016-08-17 丹阳市金诺电器有限公司 一种组合式1kv级变压器套管
EP3410448A1 (fr) 2017-06-01 2018-12-05 Preis & Co Ges.m.b.H. Kit pour un dispositif de traversée
WO2018219637A1 (fr) 2017-06-01 2018-12-06 Preis & Co Ges.m.b.H. Kit d'un ensemble de traversée

Also Published As

Publication number Publication date
ITMI20030678A1 (it) 2004-10-08
PL1614127T3 (pl) 2008-10-31
DE602004013755D1 (de) 2008-06-26
ES2307004T3 (es) 2008-11-16
ATE395710T1 (de) 2008-05-15
WO2004090917A1 (fr) 2004-10-21
PT1614127E (pt) 2008-07-31
EP1614127A1 (fr) 2006-01-11

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