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EP3001437A1 - Système d'exécution - Google Patents

Système d'exécution Download PDF

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Publication number
EP3001437A1
EP3001437A1 EP14186791.1A EP14186791A EP3001437A1 EP 3001437 A1 EP3001437 A1 EP 3001437A1 EP 14186791 A EP14186791 A EP 14186791A EP 3001437 A1 EP3001437 A1 EP 3001437A1
Authority
EP
European Patent Office
Prior art keywords
shield
transformer
support insulator
dry
ring
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.)
Granted
Application number
EP14186791.1A
Other languages
German (de)
English (en)
Other versions
EP3001437B1 (fr
Inventor
Rudolf Hanov
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.)
Siemens AG
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP14186791.1A priority Critical patent/EP3001437B1/fr
Priority to PL14186791T priority patent/PL3001437T3/pl
Priority to ES14186791T priority patent/ES2767340T3/es
Publication of EP3001437A1 publication Critical patent/EP3001437A1/fr
Application granted granted Critical
Publication of EP3001437B1 publication Critical patent/EP3001437B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • 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
    • H01F27/288—Shielding
    • H01F27/2885—Shielding with shields or electrodes

Definitions

  • the invention relates to a feed-through system for a connection of a dry-type transformer with outer grounded shield, comprising a substantially circular-cylindrical support insulator for passing through the shield.
  • a dry-type transformer is a transformer which does not contain liquid insulating materials, such as e.g. B. contains transformer oil. Dry transformers are commonly used as power transformers, in particular as such in electrical energy networks. They are therefore often three-phase designed as a three-phase AC transformer. Dry transformers are used especially where due to the proximity to persons or property oil-filled transformers or only with significant fire protection measures such. B. fire walls, can be placed. Also, oil catchment pits do not contribute to groundwater protection.
  • dry-type transformers are usually designed with two- or three-core iron cores made from electrically insulated electrical steel sheets on both sides.
  • the legs, which are provided with the coil windings are connected on both sides by yokes. It is known to increase the security to provide the legs with an outer shield, which completely surrounds the legs, is made of an electrically conductive material and grounded.
  • the implementation system comprises a disc-shaped shielding, which is made of an insulating material and surrounds the support insulator flush.
  • the invention is based on the consideration that a shorter distance between outer terminal and shield realized and thus a shorter support insulator could be used if the risk of breakdown could be banned by the air through an additional, interposed insulating surface.
  • an insulating surface should be particularly easy to attach. This can be realized by a shield, which surrounds the support insulator flush and thereby achieved on the one hand a gapless, electrically sealed insulation for shielding and on the other hand is easy to fasten.
  • the shielding ring is advantageously circular-disk-shaped in order to ensure sufficient insulation in all spatial directions.
  • the shielding ring has the multiple diameter of the post insulator. This refers to the implementation system seen from the axial direction of the post insulator. The shielding ring thus extends from the edge of the support insulator in each radial direction at least over a further diameter of the support insulator.
  • the shielding ring tapers towards its outer edge. Namely, as the distance from the inner conductor of the post insulator increases, the distance of one dot on the surface of the shield from the terminal on the post insulator becomes long, so that a smaller post insulator length is required. By rejuvenating the shield ring is easier and thus the mechanical attachment easier.
  • the shielding ring is made of cast resin.
  • Cast resin has the advantage that it is completely flexible formable by the liquid processing.
  • the shielding ring can thus be poured in a simple manner in a mold.
  • casting resin has the high resistance required for this application and a corresponding dielectric strength.
  • the shielding ring is advantageously arranged on a tapering section of the support insulator and fixed in a form-fitting manner by means of a pressing part screwed to a connection surface of the support insulator.
  • the shield is fixed in a particularly simple manner in the axial direction of the support insulator. Due to the taper of the post insulator, the shield ring can not be displaced beyond the taper in the radial direction.
  • a correspondingly shaped pressing part which is screwed onto the end face of the support insulator, fixes the shielding ring.
  • a connection connected to the inner conductor of the support insulator is arranged on the pressing part.
  • the connection for the coil windings is particularly easy to reach even when attaching such a pressing part on the outside of the post insulator.
  • a dry-type transformer with an outer grounded shield advantageously comprises a feed-through system arranged in a connection opening of the grounded shield.
  • the shielding ring is arranged on the outside of the grounded shield, which encloses a leg of the dry-type transformer.
  • the radius of the shielding ring is advantageously more than one third of the distance between the two connection openings. As a result, the available space for the insulation of the terminals against the shield is optimally utilized.
  • the radius of the shield ring in this case is less than half the distance between the two connection openings. This ensures that can be arranged above each of the connections such a shield.
  • a trained according to the aforementioned type dry transformer is advantageously designed for a rated voltage of more than 1 kV and / or a rated power of more than 50 kVA.
  • the embodiment of the feedthrough system described above by the grounded shielding is of considerable advantage.
  • the dry-type transformer is advantageously designed as a cast-resin transformer, d. H.
  • the insulation of the high voltage windings consists of cast resin.
  • the advantages achieved by the invention are, in particular, that by the arrangement of a disc-shaped shielding ring around the terminals by performing support insulators a dry transformer, the length of the support insulators can be significantly shortened and thus the dry-type transformer can be used much more flexible in terms of its installation location.
  • the implementation system 1 described below is designed for cast resin transformers with a rated voltage of more than 1 kV and / or a rated power of more than 50 kVA and thus has a corresponding size. It is thus particularly suitable for power transformers in electrical energy networks.
  • the implementation system 1 is in the FIG. 1 shown in longitudinal section.
  • the inside of the transformer is located on the left, the outside on the right.
  • Central, supporting component is a circular cylindrical support insulator 2 (support), in the axis of which an electrical inner conductor 4 is arranged.
  • the inner conductor 4 is connected to a driven in the support insulator 2 metallic thread 5.
  • the support insulator is at some distance from its outer end in one piece with the inner one Coil 6 of the transformer made in a casting of cast resin.
  • the remaining part of the post insulator 2 is thus also made of cast resin.
  • the inner conductor 4 may also be surrounded by a cylindrical jacket-shaped, inside the support insulator 2 concentrically arranged around the inner conductor 4 grounded conductive shield.
  • the support insulator 2 essentially serves to allow electrical contact with the wire windings or the coil 6 in the interior of the transformer. These are in fact surrounded by a grounded, metallic shield, which is applied as conductive earth covering 8 on the molded resin with spool 6. This has a circular opening whose diameter substantially corresponds to the outer diameter of the support insulator 2.
  • the coil 6 is covered by the conductive earth covering 8, which extends along the jacket of the support insulator 2 over a short distance to an O-ring 10, which extends in a groove around the whole support insulator 2 in a circular manner.
  • the O-ring 10 is made of a conductive material.
  • the diameter of the post insulator 2 decreases to the end of the post insulator 2.
  • the radial center of the pointing in the axial direction surface of the step 12 is also arranged around the axis of the support insulator 2 circular circumferential groove into which a further O-ring 16 is introduced.
  • a cylinder jacket-shaped silicone ring 18 is pushed from the end. Its inner diameter corresponds substantially to the outer diameter of the tapered portion, but both components are designed for a press fit.
  • the silicone ring 18 is on its inner and outer shell surface 20 greased with grease.
  • the axial length of the silicone ring 18 substantially corresponds to the axial length of the tapered portion 12.
  • a shielding ring 22 is pushed, which is shaped substantially in an annular manner.
  • the shield ring 22 has an inner cylinder jacket-shaped opening whose inner diameter substantially corresponds to the outer diameter of the silicone ring 18, but both components are again designed for a press fit.
  • the shielding ring 22 is rotationally symmetrical. Its outer diameter is about three times the outer diameter of the post insulator.
  • the axial thickness of the shielding ring 22 at its central opening is only slightly less than the axial length of the silicone ring 18.
  • the shielding ring 22 is tapered in its thickness. It is made entirely of cast resin. It has on the coil 6 side facing partially recesses 23, which reduce the weight of the shield 22. Nevertheless, a screen-shaped, continuous through the diameter surface is maintained.
  • a screw 24 is screwed, which protrudes from the thread 5 and serves for fastening a circular-disc-shaped pressing part 16.
  • it protrudes through an opening in the middle of the pressing part 16, in which a nut 28 is arranged, so that the pressing member 26 can be screwed axially onto the support insulator 2.
  • the outer diameter of the pressing part 26 corresponds to the diameter of the support insulator 2 outside the tapered portion 12, so that the pressing part projects beyond the diameter of the tapered portion 12.
  • a step 30 is formed. In the radial center of the axially facing surface of the step 30, a groove circulating around the axis of the support insulator 2 is arranged symmetrically with respect to the other step 14, into which a further O-ring 32 is inserted.
  • the external electrical terminal 34 which is electrically connected to the inner conductor 4, is disposed on the outside of the pressing part 26.
  • the terminal 34 may be provided with a cap 36, which in FIG. 1 only shown by dashed lines.
  • FIG. 2 shows the implementation system 1 from direction A, ie axially from the outside, but without applied pressing member 28 can be seen is the circular diameter of the shield ring 22 and the silicone ring 18. Furthermore, the end base of the support insulator 2 with the thread 5 is shown. FIG. 2 also illustrates that the recesses 23 are formed cake pie. The recesses 23 are of course not visible from the outside as explained above.
  • FIG. 3 finally shows a dry-type transformer 38, which is designed as a cast-resin transformer. He has an iron core layered from electrical sheets.
  • the iron core of the dry-type transformer 38 has three legs, which are parallel to one another and wound with wire windings, which are each surrounded by a cylindrical jacket-shaped, grounded shield 40. The legs are connected at their ends by yokes 42 with each other.
  • connection openings for connections of the internal windings in the shield 40 which are formed with the implementation system 1 described above, are located laterally.
  • the connection openings lie in each case in the middle in the upper and lower half of the legs.
  • the position of the post insulators 2 in this case depends on the electrical distances between the post insulators 2 and the distances to external grounded parts, eg. B. press frame.
  • the height of the coil 6 is also a criterion.
  • the radius of the shielding ring 22 is each Implementing system 1 between one third and half the distance between these connection openings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Transformers For Measuring Instruments (AREA)
EP14186791.1A 2014-09-29 2014-09-29 Système d'exécution Active EP3001437B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP14186791.1A EP3001437B1 (fr) 2014-09-29 2014-09-29 Système d'exécution
PL14186791T PL3001437T3 (pl) 2014-09-29 2014-09-29 System przelotowy
ES14186791T ES2767340T3 (es) 2014-09-29 2014-09-29 Sistema de alimentación

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14186791.1A EP3001437B1 (fr) 2014-09-29 2014-09-29 Système d'exécution

Publications (2)

Publication Number Publication Date
EP3001437A1 true EP3001437A1 (fr) 2016-03-30
EP3001437B1 EP3001437B1 (fr) 2019-11-13

Family

ID=51655566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14186791.1A Active EP3001437B1 (fr) 2014-09-29 2014-09-29 Système d'exécution

Country Status (3)

Country Link
EP (1) EP3001437B1 (fr)
ES (1) ES2767340T3 (fr)
PL (1) PL3001437T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112109257A (zh) * 2020-07-14 2020-12-22 平高集团有限公司 一种绝缘子浇注成型模具

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1137928A (en) * 1966-10-03 1968-12-27 Smiths Industries Ltd Improvements in or relating to high-voltage bushing assemblies
WO2001008175A1 (fr) * 1999-07-22 2001-02-01 Siemens Ltda. Transformateur de distribution
JP2008028222A (ja) * 2006-07-24 2008-02-07 Takaoka Kasei Kogyo Kk モールド変圧器
EP2075806A1 (fr) * 2007-12-27 2009-07-01 Elettromeccanica di Marnate S.p.A. Transformateur à isolation en résine de type sèche avec enroulements primaires côte à côte isolés
JP2011134873A (ja) * 2009-12-24 2011-07-07 Fuji Electric Systems Co Ltd 樹脂モールドコイル

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1137928A (en) * 1966-10-03 1968-12-27 Smiths Industries Ltd Improvements in or relating to high-voltage bushing assemblies
WO2001008175A1 (fr) * 1999-07-22 2001-02-01 Siemens Ltda. Transformateur de distribution
JP2008028222A (ja) * 2006-07-24 2008-02-07 Takaoka Kasei Kogyo Kk モールド変圧器
EP2075806A1 (fr) * 2007-12-27 2009-07-01 Elettromeccanica di Marnate S.p.A. Transformateur à isolation en résine de type sèche avec enroulements primaires côte à côte isolés
JP2011134873A (ja) * 2009-12-24 2011-07-07 Fuji Electric Systems Co Ltd 樹脂モールドコイル

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112109257A (zh) * 2020-07-14 2020-12-22 平高集团有限公司 一种绝缘子浇注成型模具

Also Published As

Publication number Publication date
ES2767340T3 (es) 2020-06-17
EP3001437B1 (fr) 2019-11-13
PL3001437T3 (pl) 2020-05-18

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