EP3001435B1 - Noyau de transformateur à sec - Google Patents

Noyau de transformateur à sec Download PDF

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Publication number
EP3001435B1
EP3001435B1 EP14186803.4A EP14186803A EP3001435B1 EP 3001435 B1 EP3001435 B1 EP 3001435B1 EP 14186803 A EP14186803 A EP 14186803A EP 3001435 B1 EP3001435 B1 EP 3001435B1
Authority
EP
European Patent Office
Prior art keywords
dry
housing
type transformer
core
transformer core
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.)
Not-in-force
Application number
EP14186803.4A
Other languages
German (de)
English (en)
Other versions
EP3001435A1 (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
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 filed Critical Siemens AG
Priority to DK14186803.4T priority Critical patent/DK3001435T3/en
Priority to EP14186803.4A priority patent/EP3001435B1/fr
Priority to PCT/EP2015/071235 priority patent/WO2016050515A1/fr
Priority to US15/510,912 priority patent/US10361024B2/en
Priority to BR112017006229A priority patent/BR112017006229A2/pt
Publication of EP3001435A1 publication Critical patent/EP3001435A1/fr
Application granted granted Critical
Publication of EP3001435B1 publication Critical patent/EP3001435B1/fr
Not-in-force 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
    • H01F27/23—Corrosion protection
    • 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
    • H01F27/022—Encapsulation
    • 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
    • H01F27/24—Magnetic cores
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/25—Magnetic cores made from strips or ribbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F2003/005—Magnetic cores for receiving several windings with perpendicular axes, e.g. for antennae or inductive power transfer
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures

Definitions

  • the invention relates to a dry-type transformer core comprising an iron core having a number of wraparound legs interconnected by a number of yokes, the dry-transformer core comprising a housing formed integrally with the iron core and surrounding the iron core flush.
  • Such a dry transformer core is from WO 2011/107387 A1 already known.
  • a composite of amorphous strip core is shown, wherein the staggered thin amorphous strips are held by relatively thick steel sheets in the form.
  • the core thus formed in layers also has a jacket, which is designed as a wrapping with a tape, a film or a film.
  • the US 2013/0162386 A1 also shows a core having an anticorrosive outer coating.
  • the outer coating comprises first, second and third layers made of different materials.
  • the US 2011/0248808 A1 describes a dry-type transformer intended for attachment to a power pole.
  • 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 particularly used where, because of the proximity to persons or property oil filled transformers or only with significant measures to Fire protection, such. B. fire walls, can be placed. Also, oil catchment pits do not contribute to groundwater protection.
  • Dry transformer cores like liquid-filled transformers, are usually designed as two-core or three-core iron cores made of double-sided insulated electrical steel sheets.
  • the legs, which are provided with the coil windings are connected on both sides by yokes. Due to the use of thin magnetic sheets for core production, it must be held, fastened and pressed in various places. This has so far been achieved by bandaging, screwing and compression. If very thin, amorphous sheets are used, the mechanical stabilization of the core is even more complex.
  • the enclosure is designed in several parts, one of the parts enclosing one of the yokes.
  • the invention is based on the consideration that both of the above tasks could be solved by a housing, on the one hand ensures the mechanical strength of the iron core by enclosing it flush, ie so that the individual electrical sheets through the enclosure form fit in their Position, and on the other hand Ensures good corrosion protection by means of a complete encapsulation.
  • the enclosure is designed in several parts, one of the parts enclosing one of the yokes. Overall, the enclosure should be designed so that the iron core can be inserted in its individual sections, assembled and assembled. In particular, the enclosure is designed so that coils can be guided over the individual iron core legs and their Umhausungsteil, and then a yoke can be applied. This is in turn enclosed by appropriate Umhausungs negligence.
  • the non-magnetic enclosure advantageously has an average permeability of between -1.01 and 1.01, preferably between -1.001 and 1.001.
  • the permeability number refers to the ratio of the permeability (ratio of the magnetic flux density to the magnetic field strength) of the housing to that of the vacuum.
  • the enclosure is thus advantageously made of a material whose permeability as far as possible corresponds to that of the vacuum.
  • the wall thickness of the enclosure is advantageously less than 1 cm. Under the wall thickness in this case the distance of the outer surface of the enclosure is understood to the outer surface of the iron core.
  • the enclosure is predominantly made of a plastic.
  • plastic is meant here an organic, polymeric solid which is produced synthetically or semi-synthetically from monomeric organic molecules or biopolymers. Plastics usually meet the requirement of non-magnetisability, are easy to shape and have sufficient stability.
  • the enclosure is predominantly made of steel.
  • non-magnetic steels such as chromium-nickel steels are used, which have a corresponding permeability.
  • chromium-nickel steels are used, which have a corresponding permeability.
  • steels are relatively flexible moldable and have the necessary strength to stabilize the iron core.
  • steels are electrically conductive, so that electric field strength peaks are reduced, especially when the enclosure is rounded.
  • the housing is also grounded.
  • the enclosure on its outside on a number of fastening devices.
  • This can include both the fastening devices for the installation of the transformer itself, as well as for the attachment of the windings.
  • the iron core is advantageously made of amorphous films. Especially with such iron cores, which need to be stabilized without housing particularly complex and where attachment is particularly difficult to accomplish, the use of a housing with corresponding fastening devices of very particular advantage.
  • the enclosure advantageously comprises an insulating part, which is designed such that no closed conductor loop is formed around the iron core.
  • an electrically conductive housing it is necessary to design these with a non-conductive interruption, which can be arranged virtually arbitrarily, only topologically so expanded and arranged that no closed loop can be formed around the iron core. As a result, namely short circuit turns are avoided.
  • the interruption can be made of a suitable insulating material.
  • a dry-type transformer advantageously comprises a described dry-type transformer core and a number of coils wound around the legs enclosed by the enclosure.
  • a trained according to the aforementioned type of dry transformer is advantageously for a rated voltage of more designed as 1 kV and / or a rated power of more than 50 kVA.
  • the enclosure of the iron core described above is of considerable advantage in the design.
  • 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 the mechanical strength of the dry transformer core is ensured by the installation of the iron core in a non-magnetic housing as a supporting component, without consuming core bandages, core fittings or Kernpressvoriquesen would be needed.
  • the result is a completely encapsulated iron core, which is protected against corrosive influences.
  • the noise level is reduced, as this is essentially generated by the magnetostriction of the iron core, which is shielded by the housing.
  • the shape of the enclosure can follow the iron core shape and can also be made for round, oval or rectangular iron core sections.
  • the assembly of the enclosure can take place with consideration of an isolation with all known joining methods.
  • the illustrated dry-transformer cores 1 have an iron core 2 which is layered out of electric sheets.
  • the core is made up of amorphous foils. He is shown in dashed lines in all figures, since he is located within the housing 4.
  • the electrical steel sheets have a height decreasing in height and width to the edge of the iron core 2, so that result in the stacked in the electric sheets by the smaller dimension in each layer stages 6. As a result, a slightly rounded shape of the iron core 2 is achieved. In other, not shown embodiments, it may also be economical, for.
  • amorphous sheets have a rectangular core cross-section without rounding of the edges.
  • the windings comprise a common iron core 2.
  • the dry-transformer cores 1 shown in the figures are designed for core transformers.
  • leg 8 to be wound (also main leg) are connected at their ends by yokes 10 with each other.
  • the design of transformer cores is specified in a coding consisting of two numbers. The first number describes the number of wound legs 8, the second the number of return legs (this is understood to mean outer unwound legs in the shell transformer).
  • Each figure shows a 3/0-Trockentransformern core 1, d. H. a three-legged dry-transforming core 1 without a yoke leg, whose three legs 8 are provided for a winding.
  • the embodiments are only an example, the enclosure shown here with all the described properties can also be produced for any other configurations.
  • the housing 4 is made in all figures of a non-magnetic material, d. H. a material having a permeability number in the range of -1.01 to 1.01.
  • a non-magnetic material d. H. a material having a permeability number in the range of -1.01 to 1.01.
  • a plastic or in other embodiments chromium-nickel steel can be used.
  • the housing 4 is in each case integrally formed integrally with the iron core 2, that is to say it is designed such that it holds together the iron sheets of the iron core 2 in a form-fitting manner. It encloses the iron core 2 completely, so encapsulates it.
  • the enclosure 4 in this case each has a wall thickness of less than 1 cm, ie a few mm. Between the iron core 2 and enclosure 4 remaining void is filled with a suitable material.
  • the housing 4 is in each case made of several parts: First, a first part 12 is provided which surrounds the upper yoke 10 and a second part 14, which surrounds the legs 8 and the lower yoke 10.
  • Both parts 12, 14 are in turn constructed in two parts as half-shells, so that in the manufacturing process, the iron core 2 can be inserted into the first half-shell and then connected the second half-shell for stabilization with the first half-shell.
  • FIG. 1 shows a dry transformer core 1 with a housing 4 with a round cross-section over the yokes 10 and legs 8. It follows the outer contour of the iron core. 2
  • FIG. 2 shows a dry-transforming core 1 with a housing 4 also round in cross-section over the yokes 10 and legs 8, which is shaped as well as the enclosure in FIG 4. However, it additionally has fastening devices 16, 18 in the manner of externally attached to the housing 4 eyelets on. There are fastening devices 16 for fixing the dry transformer core 1 when installing the transformer z. B. provided on carriers 20. Further fastening devices 18 serve to fix the windings, not shown.
  • the housing 4 in the FIG. 2 made of an electrically conductive material, for.
  • the housing 4 is initially grounded.
  • it includes two in FIG. 2 shown insulating parts 22 which are formed so that no closed conductor loop can form around the iron core 2.
  • the sides of the insulating parts 22 each form a rectangle whose sides run parallel to the axis of the respective leg 8 or yoke 10 on the inside, ie the surface of the wall 4 facing the adjacent leg 8 or yoke 10 and form a closed line here.
  • the insulating members 22 here interrupt the otherwise conductive body of the enclosure 4. Through the sides of the insulating parts 22 is a current flow avoided in the transformation 4 around the legs 10 and yokes 8 around.
  • FIG. 3 shows a dry-transforming core 1, the housing 4, the same fastening devices 16, 18 as that of the FIG. 2 having.
  • the cross section of the enclosure 4 is rectangular over the yokes 10 and legs 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Soft Magnetic Materials (AREA)

Claims (14)

  1. Noyau (1) de transformateur à sec, comprenant un noyau (2) de fer, ayant un certain nombre de branches (8) conçues pour un bobinage et reliées entre elles par un certain nombre de culasses (10), le noyau (1) de transformateur à sec comprenant un entourage (4) formé sur le noyau (2) de fer et qui entoure au raz le noyau (2) de fer,
    caractérisé en ce que l'entourage (4) est conformé en plusieurs parties, l'une des parties (14) entourant l'une des culasses (10).
  2. Noyau (1) de transformateur à sec suivant la revendication 1, dans lequel l'entourage (4) est amagnétique.
  3. Noyau (1) de transformateur à sec suivant l'une des revendications précédentes, dans lequel l'entourage (4) a une perméabilité relative comprise entre -1,01 et 1,01, de préférence entre -1,001 et 1,001.
  4. Noyau (1) de transformateur à sec suivant l'une des revendications précédentes, dans lequel l'épaisseur de paroi de l'entourage (4) est d'au moins 1 cm.
  5. Noyau (1) de transformateur à sec suivant l'une des revendications précédentes, dans lequel l'entourage (4) est fabriqué de manière prépondérante en matière plastique.
  6. Noyau (1) de transformateur à sec suivant l'une des revendications 1 à 4, dans lequel l'entourage (4) est fabriqué d'une manière prépondérante en acier.
  7. Noyau (1) de transformateur à sec suivant l'une des revendications précédentes, dans lequel l'entourage (4) est mis à la terre.
  8. Noyau (1) de transformateur à sec suivant l'une des revendications précédentes, dans lequel l'entourage (4) a, sur sa face extérieure, un certain nombre de dispositifs (16, 18) de fixation.
  9. Noyau (1) de transformateur à sec suivant l'une des revendications précédentes, dans lequel le noyau (2) de fer est constitué de feuilles amorphes.
  10. Noyau (1) de transformateur à sec suivant l'une des revendications précédentes, dans lequel un espace intermédiaire subsistant entre le noyau (2) de fer et l'entourage (4) est rempli.
  11. Noyau (1) de transformateur à sec suivant l'une des revendications précédentes, dans lequel l'entourage (4) comprend une partie isolante constituée de manière à ne pas créer de boucles conductrices fermées autour du noyau (2) de fer.
  12. Transformateur à sec comprenant un noyau (1) de transformateur à sec suivant l'une des revendications précédentes, ainsi qu'un certain nombre de bobinages enroulés autour des branches (8) entourées de l'entourage (4).
  13. Noyau de transformateur à sec suivant la revendication 12, conçu pour une tension nominale de plus de 1 kV et/ou une puissance nominale de plus de 50 kVA.
  14. Noyau de transformateur à sec suivant la revendication 12 ou 13, qui est conçu sous la forme d'un transformateur à résine de coulée.
EP14186803.4A 2014-09-29 2014-09-29 Noyau de transformateur à sec Not-in-force EP3001435B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DK14186803.4T DK3001435T3 (en) 2014-09-29 2014-09-29 The dry transformer core
EP14186803.4A EP3001435B1 (fr) 2014-09-29 2014-09-29 Noyau de transformateur à sec
PCT/EP2015/071235 WO2016050515A1 (fr) 2014-09-29 2015-09-16 Noyau de transformateur sec
US15/510,912 US10361024B2 (en) 2014-09-29 2015-09-16 Dry-type transformer core
BR112017006229A BR112017006229A2 (pt) 2014-09-29 2015-09-16 núcleo de transformador do tipo seco

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14186803.4A EP3001435B1 (fr) 2014-09-29 2014-09-29 Noyau de transformateur à sec

Publications (2)

Publication Number Publication Date
EP3001435A1 EP3001435A1 (fr) 2016-03-30
EP3001435B1 true EP3001435B1 (fr) 2017-11-15

Family

ID=51619086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14186803.4A Not-in-force EP3001435B1 (fr) 2014-09-29 2014-09-29 Noyau de transformateur à sec

Country Status (5)

Country Link
US (1) US10361024B2 (fr)
EP (1) EP3001435B1 (fr)
BR (1) BR112017006229A2 (fr)
DK (1) DK3001435T3 (fr)
WO (1) WO2016050515A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3073551C (fr) * 2016-09-16 2023-05-09 Energo Group Canada Inc. Reduction de pertes pour distribution d'energie electrique
DE102017223839A1 (de) * 2017-12-28 2019-07-04 Siemens Aktiengesellschaft Magnetkern mit Rückschlussschenkel
US10826297B2 (en) * 2018-11-06 2020-11-03 General Electric Company System and method for wind power generation and transmission in electrical power systems
CN110632427B (zh) * 2019-10-08 2022-02-01 云南电力技术有限责任公司 一种配电变压器中铁心柱结构的判断方法及装置
DE102020211253A1 (de) * 2020-09-08 2022-03-10 Siemens Energy Global GmbH & Co. KG Transformator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011107387A1 (fr) * 2010-03-01 2011-09-09 Abb Technology Ag Noyau de transformateur sec comprenant un noyau de transformateur amorphe et transformateur sec
WO2011126991A1 (fr) * 2010-04-07 2011-10-13 Abb Technology Ag Transformateur sec extérieur
US8610532B2 (en) * 2011-12-23 2013-12-17 Abb Technology Ag Corrosion-resistant coating system for a dry-type transformer core

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
WO2016050515A1 (fr) 2016-04-07
US10361024B2 (en) 2019-07-23
BR112017006229A2 (pt) 2017-12-12
DK3001435T3 (en) 2018-01-22
EP3001435A1 (fr) 2016-03-30
US20170271070A1 (en) 2017-09-21

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