EP2924698B1 - Passage huile-huile et transformateur à huile - Google Patents

Passage huile-huile et transformateur à huile Download PDF

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Publication number
EP2924698B1
EP2924698B1 EP14001129.7A EP14001129A EP2924698B1 EP 2924698 B1 EP2924698 B1 EP 2924698B1 EP 14001129 A EP14001129 A EP 14001129A EP 2924698 B1 EP2924698 B1 EP 2924698B1
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EP
European Patent Office
Prior art keywords
oil
bushing
conductor
shielding element
electrical
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.)
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Application number
EP14001129.7A
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German (de)
English (en)
Other versions
EP2924698A1 (fr
Inventor
Isidoro Li Pira
Ulrich Huhn
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.)
ABB Schweiz AG
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ABB Schweiz AG
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Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP14001129.7A priority Critical patent/EP2924698B1/fr
Priority to US14/665,689 priority patent/US9666329B2/en
Priority to CN201510138601.3A priority patent/CN104952599B/zh
Publication of EP2924698A1 publication Critical patent/EP2924698A1/fr
Application granted granted Critical
Publication of EP2924698B1 publication Critical patent/EP2924698B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
    • 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
    • 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
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling

Definitions

  • the invention relates to an oil-oil passage, comprising a rotationally symmetrical, paraboloid-like, hollow feedthrough element made of a solid insulating material, along the axial extent of which a tube-like feedthrough channel is formed radially inwardly, the wall thickness is tapered to at least one of its two ends and conical further comprising a form-fitting fitted into the duct and from this both sides outstanding electrical feedthrough conductor.
  • transformers are used to transfer electrical energy between different voltage levels in power distribution networks. For example, for a rated voltage level of 110kV / 380kV they have a power of several 100MVA. Due to the high voltages each sufficiently large isolation distance between live components must be observed, which leads in particular the transformer side in the insulation medium air to a disadvantageously increased size. For this reason, transformers of such high voltage levels are usually designed as oil transformers, that is, the actual transformer is arranged in an oil-filled boiler, wherein the oil serves both as an insulating and cooling medium. Due to the high insulation resistance of oil Air thus the insulation distances and thus the size of the transformer can be reduced in an advantageous manner.
  • feedthroughs are necessary in order to comply with the insulation distances required for different insulation media.
  • bushings are also necessary if an electrical conductor is led from a closed space through a wall into an adjacent closed space which is filled with the same insulating medium.
  • Such an example can also be found in an oil transformer, namely where electrical conductors are routed from the oil-filled interior of an oil boiler in which a transformer is located to an adjacent inner region of the same oil boiler, from which, for example, cable connections exit.
  • Such bushings are called oil-oil passage. The separation of the various internal areas ultimately serves to form separate oil reservoirs.
  • the side of the feedthrough facing the transformer is referred to as the input side and the side facing the cable space is referred to as the output side.
  • Such oil-oil feedthroughs are based on the prior art on a standardized so-called vacuum termination element.
  • This is a rotationally symmetrical, paraboloid-like, hollow feedthrough element made of a solid insulating material, along the axial extent of which a tube-like feedthrough channel is formed radially inward, the wall thickness of which tapers conically towards at least one of its two ends.
  • the shape of the feedthrough element is also comparable to that of a funnel, wherein the funnel outlet is extended rearwardly into the widened area of the funnel.
  • the widened side of the feedthrough element is typically facing away from the transformer in the installed state and facing the cable space.
  • the widened side of a lead-through element is therefore also referred to as the output side and the side remote from it as the input side.
  • a disadvantage here proves that an oil-oil implementation of the prior art based on such a standardized vacuum completion cumbersome is to be mounted, since on the output side additional barriers are necessary to control the field strength occurring during operation such that an electrical breakdown by oil is reliably avoided.
  • additional insulation is required to prevent partial discharges.
  • a wound paper insulation is usually used here, which requires a high manufacturing outlay. Both the paper insulation and the barriers, which are usually made from pressboard, have a high risk of moisture absorption, which can impair their function in the oil transformer.
  • the elimination of a paper insulation or barriers according to the invention is therefore an additional advantage, in particular in the case of on-site assembly, because there is no possibility of drying in order to counteract this effect.
  • the patent document JP H10 256044 A discloses a passage for an oil-cooled transformer with a paraboloid-like feedthrough element made of a solid insulating material with a centrally guided through this feedthrough conductor, at one end of a hollow cylindrical shield member is provided.
  • the patent document JP S56 42313 A discloses a passage for oil transformers with a conically tapered screen element.
  • the patent document EP 0 383 988 A1 discloses a high voltage feedthrough for oil cooled electrical appliances, in particular high voltage machine and mains transformers, in which components for electrical and mechanical connection of the end of a feedthrough conductor pin to a high voltage leading lead lie in a cup-shaped shield.
  • An induction-poor fixed resistor forming the end of the connecting conductor lies spatially and electrically between the cup-shaped shield and a cup-shaped shielding pot similar to this one.
  • an oil-oil passage according to claim 1.
  • the basic idea of the invention is to provide a respective dome-like screen element made of an electrically conductive material on both sides at the ends of the feedthrough channel of a known feedthrough element, which the potential distribution during operation of the oil Oil passage influenced such that no additional barriers or no additional isolation effort is required.
  • an axial overlap of the feedthrough channel with a respective screen element is provided. Therefore, the inner diameter of such a hollow cylindrical screen element is chosen so that it is in any case greater than the outer diameter of the respective end of the axially tapering towards its two ends outwardly passage channel.
  • the conical taper allows for increased overlap area.
  • a sufficient axial length of the dome-shaped shielding elements is provided in order, inter alia, to ensure a corresponding field strength distribution by an increased distance from the wall through which the bushing is guided.
  • a known vacuum termination or a known rotationally symmetrical, paraboloid-like, hollow lead-through element have, for example, an outer radius of the widened (initial) side of about 30 cm, the axial length being about 26 cm.
  • the inner diameter of the feed-through channel is constantly about 4cm, with its axial length is about 22cm.
  • the length of a typical feedthrough conductor is approximately 43cm, resulting in a lead overhang of approximately 10cm for each side.
  • the lead-through channel extends approximately 14 cm in the axial direction to the widened (initial) side, where it has an outer diameter of approximately 4.5 cm and is approximately 4 cm from the widened end away.
  • the passage channel extends another 8cm to the rear and has at its local end an outer diameter of about 8.2 cm.
  • the inner diameter of a matching screen element which is arranged facing away from the widened (output) side, for example, is about 9 cm and is thus about 0.8 cm larger than the corresponding outer diameter of the local end of the feedthrough channel of about 8.2 cm. This allows a corresponding overlap.
  • a corresponding outer diameter of the shielding element which is made for example of a metal such as aluminum, is about 15cm, which gives a typical wall thickness of 30mm.
  • the inner diameter of a matching screen element which faces the widened (output) side, for example, is about 6 cm and is thus about 1.5 cm larger than the corresponding outer diameter of the local end of the feedthrough channel of about 4.5 cm.
  • a suitable outer diameter of the screen element is about 12 cm, which in turn results in a typical wall thickness of 30mm.
  • a suitable axial length of such a screen element is for example about 20 cm or more.
  • an oil-oil passage is formed, which can be installed in a simple manner without additional barriers or additional insulation effort and which is characterized by its robustness and compactness.
  • the shielding element is coated at least on its outer surface with an insulating material, in particular with an epoxy resin.
  • the widened open end of the paraboloid-like feedthrough element merges into a terminating region extending radially outwards perpendicular to the axis of rotation.
  • the electrical feedthrough conductor fitted in the feedthrough channel has a respective shape at its two projecting ends which is suitable for the positive electrical contacting of a respective connecting conductor with a correspondingly complementary shape.
  • Such a shape is characterized in particular by an increased contact surface between conductors to be connected.
  • a tongue and groove shape is an example of a suitable shape.
  • the conductor ends can be screwed to their respective complementary shape so as to ensure a reliable contact.
  • contacting means for its electrical contacting with the projecting feedthrough conductor or with a picked-up connecting conductor are provided in the shielding element.
  • the shielding element is securely placed on the electrical potential of the performed conductor.
  • An internal potential difference can therefore not occur and due to the increased radius of the shielding element with respect to the conductor diameter, the field strength at the outer surface of the shielding element is correspondingly reduced during operation.
  • the contacting means of the shielding element comprise at least one ring-like and preferably resilient element made of an electrically conductive material, wherein the element is intended to surround the projecting feedthrough conductor or a received connecting conductor in a contacting manner. Due to the increased contact surface of the ring-like element to the performed conductor a secure electrical contact is ensured, wherein the ring-like element also serves for further contacting of the shield element.
  • the contacting means comprise at least one thread extending radially through the wall of the screen element and a thread arranged therein Screw for fixing the protruding lead-in conductor or a received connection conductor. If a ring-like element is provided, this can also be fixed with one or more screws and thus also a guided by this conductor.
  • the screen element can be fastened in a particularly simple manner from the outside, whereby its assembly is simplified in an advantageous manner and, moreover, a compact design is achieved.
  • At least three threads of a screen element are arranged in a star shape, preferably in a common plane perpendicular to the axial course of the conductor to be fixed. This allows a particularly secure fixation along the entire circumference of the conductor.
  • a shielding element comprises respective contacting means both for the protruding feedthrough conductor and for a received connecting conductor.
  • This can be, for example, two groups of three star-shaped threads with corresponding fixing screws.
  • a screen element has inner cavities, by means of which a partial reduction of its wall thickness is effected. Since the outer shape of the shielding element is unaffected by this, a reduction in material and weight thus a material and weight and thus easier handling are possible.
  • an oil transformer comprising an oil tank having a first oil-filled interior area in which a transformer is arranged, and one of them separated by a wall second oil-filled interior space, wherein the wall has at least one passage, by means of which an electric Connecting a first electrical connection conductor in the first interior with a second electrical Connecting conductor is formed in the second interior, wherein the at least one passage is an inventive oil-oil passage.
  • Fig. 1 shows an exemplary feedthrough element 12 with a feedthrough conductor 18 in a sectional view 10.
  • the made of a solid insulating material feedthrough element is rotationally symmetrical about a rotational axis 14, paraboloid-like and hollow configured.
  • a feed-through channel 16 is provided along the axial extent thereof, which has a constant inner diameter and a wall thickness which conically tapers at its two axial ends.
  • a feedthrough conductor 18 is positively fitted, which protrudes from the two ends of the feed-through channel 16 and is made for example of aluminum or copper.
  • the widened open end of the paraboloid-like feedthrough element 12 merges into a radially outwardly adjoining end region 22 extending perpendicularly to the axis of rotation 14, which is provided for flanging the feedthrough element against a wall.
  • the two axial end regions of the feedthrough conductor have a stepped form 22 for positive contacting, through which an increased contact surface is provided with a conductor to be connected of complementary shape.
  • the Fig. 2 shows an exemplary first screen element 30 in a sectional view. This is intended to be connected to the input side of a feedthrough element.
  • Base 48 is a hollow cylindrical body of aluminum, in this example, which extends along and about a rotation axis 32.
  • the axial ends 34 of the base member 48 are rounded to avoid sharp edges with a correspondingly increased in operation field strength.
  • three inner cavities 42 are provided, which leave the outer shape of the base element 48 unaffected and lead to a weight saving.
  • the wall thickness is reduced, as indicated by the dashed lines with the reference numeral 46, whereas in the other areas a high wall thickness of, for example, 3 cm is provided, as indicated by the dashed area by the reference numeral 44.
  • the Fig. 3 shows an exemplary second shielding element 52 with electrical conductors 56, 58 in a sectional view 50.
  • the shielding element 52 is intended to be connected to the output side of a feedthrough element.
  • Basic element is a hollow cylindrical body made of aluminum in this example.
  • ring-like elements 54 By means of ring-like elements 54, a first 56 and a second 58 conductors are fastened inside the screen element 52 using screws.
  • the conductors 56, 58 have a respective complementary stepped shape of one of their respective ends, so that thereby a positive contact 60 is given.
  • the Fig. 4 shows an exemplary oil-oil passage 70 in a three-dimensional sectional view.
  • a feedthrough conductor 76 fitted in the feedthrough channel of a feedthrough element 72 . This is connected at its output end with a first connecting conductor 74 and at its input end with a second connecting conductor 78.
  • a first screen element 80 is arranged overlapping with the corresponding one axial end of the feedthrough channel and a second screen element 82 is arranged around the input-side connection point overlapping with the corresponding other axial end of the feedthrough channel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulators (AREA)
  • Housings And Mounting Of Transformers (AREA)

Claims (9)

  1. Passage huile-huile (70), comprenant :
    - un élément de passage creux (12, 72) à symétrie de révolution (14), similaire à un paraboloïde, constitué d'un matériau d'isolation solide, le long de l'étendue axiale duquel est formé radialement à l'intérieur un canal de passage tubulaire (16) dont l'épaisseur de paroi est rétrécie coniquement vers au moins l'une de ses deux extrémités,
    - un conducteur électrique de passage (18, 76) incorporé par engagement par correspondance de formes dans le canal de passage (16) et faisant saillie des deux côtés hors de celui-ci,
    - un élément de blindage cylindrique creux respectif (30, 52, 80, 82) constitué d'un matériau conducteur au moins en partie à parois épaisses (44) étant disposé au niveau d'au moins l'une des deux extrémités axiales du canal de passage (16), lequel élément de blindage, au niveau de l'un de ses côtés, entoure l'extrémité respective du canal de passage (16) et du conducteur de passage (18, 76) faisant saillie hors de celui-ci, et lequel, au niveau de son autre côté respectif, est prévu pour recevoir et établir un contact électrique avec un conducteur de connexion respectif (74, 78),
    - les extrémités axiales de l'élément de blindage (30, 52, 80, 82) étant configurées sous forme ronde,
    - des moyens d'établissement de contact étant prévus dans l'élément de blindage (30, 52, 80, 82) en vue d'établir son contact électrique avec le conducteur de passage (18, 76) faisant saillie, respectivement avec un conducteur de connexion reçu (74, 78),
    caractérisé en ce que
    les moyens d'établissement de contact comprennent au moins un pas de filetage (36) s'étendant radialement à travers la paroi de l'élément de blindage (30, 52, 80, 82) ainsi qu'une vis (38) disposée à l'intérieur de celui-ci, pour la fixation du conducteur de passage saillant (18, 76), respectivement d'un conducteur de connexion reçu (74, 78).
  2. Passage huile-huile selon la revendication 1, caractérisé en ce que l'élément de blindage (30, 52, 80, 82) est revêtu au moins sur sa surface extérieure avec un matériau d'isolation, en particulier avec de la résine époxy.
  3. Passage huile-huile selon la revendication 1 ou 2, caractérisé en ce que l'extrémité ouverte élargie de l'élément de passage (12, 72) similaire à un paraboloïde se prolonge par une région de terminaison (22) se raccordant radialement à l'extérieur, s'étendant perpendiculairement à l'axe de rotation (14).
  4. Passage huile-huile selon l'une quelconque des revendications précédentes, caractérisé en ce que le conducteur électrique de passage (18, 76) incorporé dans le canal de passage (16) présente, au niveau de ses deux extrémités saillantes, une forme respective (20) qui est adaptée à un établissement de contact électrique (60) par engagement par correspondance formes avec un conducteur de connexion respectif (74, 78) de forme complémentaire correspondante.
  5. Passage huile-huile selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens d'établissement de contact de l'élément de blindage (30, 52, 80, 82) comprennent au moins un élément annulaire (40 ,54) en matériau électriquement conducteur, qui est prévu pour entourer avec contact le conducteur de passage saillant (18, 76), respectivement un conducteur de connexion reçu (74, 78).
  6. Passage huile-huile selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins trois pas de filetage (36) d'un élément de blindage (30, 52, 80, 82) sont disposés en étoile.
  7. Passage huile-huile selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un élément de blindage (30, 52, 80, 82) comprend des moyens d'établissement de contact respectifs à la fois pour le conducteur de passage saillant (18, 76) et pour un conducteur de connexion reçu (74, 78).
  8. Passage huile-huile selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un élément de blindage (30, 52, 80, 82) présente des cavités internes (42) par le biais desquelles une réduction partielle (46) de son épaisseur de paroi est réalisée.
  9. Transformateur à huile, comprenant une cuve d'huile avec une première région d'espace interne remplie d'huile, dans laquelle est disposé un transformateur, et comprenant une deuxième région d'espace interne séparé de celle-ci par une paroi, la paroi présentant au moins un passage au moyen duquel une connexion électrique d'un premier conducteur de connexion électrique (74, 78) dans le premier espace interne avec un deuxième conducteur électrique de connexion (78, 74) dans le deuxième espace interne est établie,
    caractérisé en ce que
    l'au moins un passage est un passage huile-huile (70) (30, 52, 80, 82) selon l'une quelconque des revendications 1 à 8.
EP14001129.7A 2014-03-27 2014-03-27 Passage huile-huile et transformateur à huile Active EP2924698B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP14001129.7A EP2924698B1 (fr) 2014-03-27 2014-03-27 Passage huile-huile et transformateur à huile
US14/665,689 US9666329B2 (en) 2014-03-27 2015-03-23 Oil-oil bushing and oil transformer
CN201510138601.3A CN104952599B (zh) 2014-03-27 2015-03-27 油-油套管及油冷变压器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14001129.7A EP2924698B1 (fr) 2014-03-27 2014-03-27 Passage huile-huile et transformateur à huile

Publications (2)

Publication Number Publication Date
EP2924698A1 EP2924698A1 (fr) 2015-09-30
EP2924698B1 true EP2924698B1 (fr) 2018-11-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14001129.7A Active EP2924698B1 (fr) 2014-03-27 2014-03-27 Passage huile-huile et transformateur à huile

Country Status (3)

Country Link
US (1) US9666329B2 (fr)
EP (1) EP2924698B1 (fr)
CN (1) CN104952599B (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5642313A (en) * 1979-09-14 1981-04-20 Fuji Electric Co Ltd Shielding for high-tension bushing of oil-immersed induction apparatus
EP0383988B1 (fr) * 1989-02-20 1993-08-11 Siemens Aktiengesellschaft Passage à haut voltage pour appareils électriques réfrigérés à l'huile
US4975797A (en) * 1989-08-16 1990-12-04 Cooper Industries, Inc. Arrester with external isolator
US5214240A (en) * 1990-08-07 1993-05-25 James G. Biddle Co. High voltage insulator testing system
JPH10256044A (ja) * 1997-03-10 1998-09-25 Mitsubishi Cable Ind Ltd 油中トランスアダプタ
CN2372768Y (zh) * 1999-04-07 2000-04-05 沈阳变压器有限责任公司 载流式油纸电容套管
KR100642538B1 (ko) * 2001-02-13 2006-11-10 스미토모덴키고교가부시키가이샤 극저온 기기의 단말 구조
SE526713C2 (sv) * 2003-07-11 2005-10-25 Abb Research Ltd Genomföring samt förfarande för tillverkning av genomföringen
EP1848009B1 (fr) * 2006-04-20 2014-03-26 ABB Technology Ltd Un élément allongé et utilisation
JP5453675B2 (ja) * 2010-05-11 2014-03-26 三菱電機株式会社 絶縁バリアおよびそれを備えた油中シールド装置の製造方法
US8759683B2 (en) * 2011-07-15 2014-06-24 Hubbell Incorporated Spark-over prevention device for high-voltage bushing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2924698A1 (fr) 2015-09-30
CN104952599B (zh) 2018-09-18
US20150279509A1 (en) 2015-10-01
CN104952599A (zh) 2015-09-30
US9666329B2 (en) 2017-05-30

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