EP3144944A1 - Elektrische wicklung, trockentransformator mit einer solchen elektrischen wicklung und verfahren zur herstellung einer elektrischen wicklung - Google Patents

Elektrische wicklung, trockentransformator mit einer solchen elektrischen wicklung und verfahren zur herstellung einer elektrischen wicklung Download PDF

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Publication number
EP3144944A1
EP3144944A1 EP15185886.7A EP15185886A EP3144944A1 EP 3144944 A1 EP3144944 A1 EP 3144944A1 EP 15185886 A EP15185886 A EP 15185886A EP 3144944 A1 EP3144944 A1 EP 3144944A1
Authority
EP
European Patent Office
Prior art keywords
winding
coating
coil
insulating body
voltage
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.)
Ceased
Application number
EP15185886.7A
Other languages
German (de)
English (en)
French (fr)
Inventor
Bernd Hofmann
Tim-Felix Mai
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 Energy Global GmbH and Co KG
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 EP15185886.7A priority Critical patent/EP3144944A1/de
Priority to BR102016020804A priority patent/BR102016020804A8/pt
Priority to CN201610821938.9A priority patent/CN107039159A/zh
Publication of EP3144944A1 publication Critical patent/EP3144944A1/de
Ceased 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • 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
    • H01F2027/329—Insulation with semiconducting layer, e.g. to reduce corona effect
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens

Definitions

  • the invention relates to an electrical winding for a dry-type transformer.
  • Dry transformers in particular cast-resin transformers are power transformers, which are used in power engineering for the transformation of voltages up to approximately 36 kV on the high-voltage side.
  • a low voltage winding and a high voltage winding are coaxially arranged around a leg of a core.
  • the winding with the lower voltage is referred to as the low-voltage winding
  • the high-voltage winding is referred to as the high-voltage winding.
  • Both windings are embedded in a solid insulating material, in the case of the high-voltage winding, a casting resin is often used for this purpose.
  • Such a dry-type transformer is out of the EP 1 133 779 B1 known.
  • an electrical winding for a dry-type transformer in particular a high-voltage winding which has a winding conductor which is wound in several turns to form a coil.
  • the winding conductor can thereby a foil conductor, a ribbon conductor or a wire conductor.
  • the coil is embedded in an insulating body made of a solid insulating material. Frequently, a casting resin is used for this, with which the coil is encapsulated and cured after casting. The result is a mechanically stable winding in the form of a hollow cylinder whose coil is well protected against environmental influences.
  • a coating of an electrically conductive material is applied on a surface of the insulating body.
  • a material is considered to be electrically conductive if its specific electrical conductivity is greater than 10 -8 Siemens per meter (S / m). Including a material is considered insulator or non-conductive.
  • the coating should be applied at least on the inner circumferential surface of the insulating body, preferably also on the end faces. Particularly preferably, the coating is applied to the entire surface of the insulating body, so in addition to the inner circumferential surface and the end faces also on the outer circumferential surface.
  • the electrical field of the electrical winding is largely degraded in the casting resin and is thus reduced outside the winding to a size that allows the distance to other components of the transformer such as core or undervoltage winding can turn out smaller, resulting in a more compact Construction allows.
  • the coating is preferably made of a semiconducting material.
  • Semiconducting material is considered in the art and within the meaning of the invention if its resistivity is greater than 10 -8 Siemens per meter and less than 10 6 Siemens per meter. Since an electrically conductive coating, in particular one of the entire surface, of a winding represents a short-circuit winding, a current will flow therein, which generates a power loss. With a coating of a semiconductive material, this power loss can be limited.
  • Suitable conductive or semiconductive coatings are known, inter alia, for the coating of cables or conductors, for example from US Pat US 2015/0243409 A1 or the DE 10 2005 018 615 A1 , They usually contain conductive or semiconducting particles in a carrier material. The material, density and size of the particles allow the specific conductivity of the coating to be adjusted over a wide range.
  • the coating preferably has a sheet resistivity, also called sheet resistance, of 10 2 ⁇ / ⁇ to 10 5 ⁇ / ⁇ , preferably 10 3 ⁇ / ⁇ to 10 4 ⁇ / ⁇ .
  • This surface resistance should have the electrical winding when new. Aging, environmental influences or pollution can change this.
  • a surface resistance of this magnitude limits the power loss particularly effectively, but on the other hand still offers sufficient scope for reducing the surface resistance due to contamination.
  • the coating is applied by a spraying process. This ensures on the one hand a uniform layer thickness and on the other hand prevents air pockets, which would lead to partial discharges.
  • the coating is electrically grounded. As a result, the electric field outside the winding is particularly effectively reduced.
  • a dry-type transformer Such has a low-voltage winding arranged around a leg of a core and a high-voltage winding arranged outside concentrically around the low-voltage winding.
  • at least the high-voltage winding is an electrical winding as previously described.
  • the coating can be applied to the entire surface or only to parts of the surface, as already described. By such a method, an electrical winding can be produced, the electric field is largely shielded by the coating, and which used in a dry transformer thereby allows a more compact design.
  • the coating is a paint.
  • the application of the coating can be done by spraying, spraying, brushing, rolling or dip coating.
  • the coating is of a semiconductive material.
  • the coating is applied in a spray process, whereby a particularly uniform layer thickness can be achieved.
  • FIG. 1 shows a half-section through a conventional dry-type transformer 50.
  • a low-voltage winding 20 Around a core leg 30, a low-voltage winding 20, an insulating cylinder 23, a high-voltage winding 51 and a shield 24 are arranged concentrically around a longitudinal axis 40 extending through the core leg 30 from the core leg 30.
  • Most dry-type transformers 50 have a core with three such core legs 30.
  • the low-voltage winding 20 is often designed as a film winding.
  • a thin conductor foil 21 is wound onto a winding core to form an undervoltage coil. Between the individual winding layers of the conductor foil, an insulating film is wrapped. Alternatively, the conductor foil could also be provided with an insulation layer.
  • the undervoltage coil is cast either with cast resin after the winding process. Alternatively, a prepreg impregnated intermediate layer 22 can be wrapped between the individual winding layers, which is cured after the winding process. In both cases, a stable hollow-cylindrical winding body is obtained.
  • the high-voltage winding 51 is designed as a disk winding.
  • a usually band-shaped conductor 11 is first wound in a plane spiral around a winding axis on a winding core to a disk coil.
  • Several such stacked disc coils are connected to each other in series with the coil 15.
  • the coil 15 is then cast in such a way with a casting resin, that the entire coil 15 is enclosed by the casting resin.
  • the coil 15 is then so embedded in the casting resin as insulating 12.
  • the hollow-cylindrical high-voltage winding 51 thus formed generally has a larger diameter than the low-voltage winding 20 and is therefore arranged outside the low-voltage winding 20 as viewed from the core leg 30.
  • an insulating cylinder 23 may be disposed of an electrically insulating material. It serves on the one hand the electrical shielding, on the other hand, for the thermal decoupling of the high-voltage winding 51 from the low-voltage winding 20th
  • the electric field which essentially arises due to the voltage applied to the high-voltage winding 51, is dissipated mainly in the air gap between the high-voltage winding 51 and the low-voltage winding 20.
  • the air gap must therefore be dimensioned according to the voltage applied to the high-voltage winding 51. At higher voltage, the air gap will be correspondingly larger.
  • the air gap also serves to cool the high voltage winding and undervoltage winding by conveying an air stream through either convection or electromechanically driven therethrough.
  • a conductive shield 24 usually made of metal, which is grounded and the dry-type transformer 1 makes safe to touch, as a person nearby it can no longer come into contact with the high electric fields of the high-voltage winding 51. So that the shield 24 does not form a short-circuit winding, it must not be closed in a circular manner, but must have an axial gap.
  • the FIG. 2 shows a dry-type transformer 1 according to the invention, which differs substantially from the known dry-type transformer 50 by virtue of its high-voltage winding 10.
  • the basic structure of the high-voltage winding 10 is similar to that of FIG. 1 ,
  • the coil 15 is constructed to the same. Also, it is as described above embedded in an insulating body 12, for example made of cast resin.
  • a conductive or semiconductive coating 14 is applied to the surface of the insulating body 12. This encloses here the entire surface of the insulating body 12 from inner shell side 16, outer shell side 17 and end faces 18. It is also conceivable to apply the coating 14 only on the inner shell side 16 or on the inner shell side 16 and the end faces 18.
  • the coating 14 is preferably a lacquer and can be applied in a common spraying process.
  • the coating 14 now causes that the electric field of the high-voltage winding 10 is almost completely degraded in the insulating body 12 of the high-voltage winding 10.
  • a voltage will be set on the surface of the coating 14 which corresponds approximately to the magnitude of the voltage of the low-voltage winding 20.
  • This gap now has virtually no electrical function and can be dimensioned almost exclusively to the required cooling capacity.
  • the coating 14 is connected at a location of ground potential.
  • the coating 14 is grounded on the lower end face 18. If the coating 14 is made of a conductive material, practically the entire surface of the coating 14 is at ground potential. If the coating 14 is made of a semiconducting material, a stress distribution will be established over the surface of the coating 14. At the point of grounding the voltage is zero, at the point of the surface furthest from this point the highest voltage will be set. The amount of this tension depends essentially from the sheet resistivity of the coating 14 from.
  • FIG. 3 shows a flow diagram of the inventive method for producing an electrical winding 10, 20 for a dry-type transformer 1, preferably the production of a high-voltage winding 10 for a dry-type transformer.
  • method step 101 first a winding conductor 11 is wound in several turns to form a coil 15. Thereafter, in step 102, the coil 15 is embedded in a solid insulating body 12, for example by molding the coil 15 with casting resin and curing of the casting resin.
  • a coating 14 made of an electrically conductive material is applied to a surface 13, preferably to the entire surface 13 of the insulating body 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP15185886.7A 2015-09-18 2015-09-18 Elektrische wicklung, trockentransformator mit einer solchen elektrischen wicklung und verfahren zur herstellung einer elektrischen wicklung Ceased EP3144944A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15185886.7A EP3144944A1 (de) 2015-09-18 2015-09-18 Elektrische wicklung, trockentransformator mit einer solchen elektrischen wicklung und verfahren zur herstellung einer elektrischen wicklung
BR102016020804A BR102016020804A8 (pt) 2015-09-18 2016-09-09 Enrolamento elétrico, transformador seco com esse enrolamento elétrico e processo para produção de um enrolamento elétrico
CN201610821938.9A CN107039159A (zh) 2015-09-18 2016-09-13 电绕组、具有电绕组的干式变压器和制造电绕组的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15185886.7A EP3144944A1 (de) 2015-09-18 2015-09-18 Elektrische wicklung, trockentransformator mit einer solchen elektrischen wicklung und verfahren zur herstellung einer elektrischen wicklung

Publications (1)

Publication Number Publication Date
EP3144944A1 true EP3144944A1 (de) 2017-03-22

Family

ID=54150329

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15185886.7A Ceased EP3144944A1 (de) 2015-09-18 2015-09-18 Elektrische wicklung, trockentransformator mit einer solchen elektrischen wicklung und verfahren zur herstellung einer elektrischen wicklung

Country Status (3)

Country Link
EP (1) EP3144944A1 (zh)
CN (1) CN107039159A (zh)
BR (1) BR102016020804A8 (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016202385A1 (de) 2016-02-17 2017-08-17 Siemens Aktiengesellschaft Kompakter Trockentransformator mit einer elektrischen Wicklung und Verfahren zur Herstellung einer elektrischen Wicklung
DE102016202391A1 (de) 2016-02-17 2017-08-31 Siemens Aktiengesellschaft Kompakter Trockentransformator mit einer elektrischen Wicklung und Verfahren zur Herstellung einer elektrischen Wicklung
DE102017221593A1 (de) * 2017-11-30 2019-06-06 Siemens Aktiengesellschaft Wicklungsanordnung
WO2020035224A1 (de) 2018-08-14 2020-02-20 Siemens Aktiengesellschaft Wicklungsanordnung mit feldglättung und armierung
EP4181160A1 (en) * 2021-11-16 2023-05-17 Huawei Digital Power Technologies Co., Ltd. Transformer and power equipment

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113056800A (zh) * 2018-06-07 2021-06-29 西门子能源巴西有限公司 用于干式变压器的被屏蔽的线圈组件和方法
DE102018212144A1 (de) * 2018-07-20 2020-01-23 Siemens Aktiengesellschaft Anordnung aufweisend einen gewendelten Leiterstrang sowie Verfahren zur Herstellung einer derartigen Anordnung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1156369A (en) * 1966-04-08 1969-06-25 Gen Electric Coated Electrostatic Shields for Electrical Apparatus
EP0061608A1 (de) * 1981-04-01 1982-10-06 Smit Transformatoren B.V. Trockentransformator oder Drosselspule mit Luftkühlung
FR2784787A1 (fr) * 1998-10-20 2000-04-21 France Transfo Sa Transformateur sec de puissance ou de distribution de l'energie electrique
EP1133779B1 (de) 1998-11-25 2005-03-16 Siemens Aktiengesellschaft Transformator - insbesondere giessharztransformator
DE102005018615A1 (de) 2004-05-17 2005-12-08 Merck Patent Gmbh Transparente leitfähige Pigmente
US20150243409A1 (en) 2014-02-25 2015-08-27 Essex Group, Inc. Insulated winding wire containing semi-conductive layers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0003037D0 (sv) * 2000-08-29 2000-08-29 Abb Ab Elektrisk maskin

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1156369A (en) * 1966-04-08 1969-06-25 Gen Electric Coated Electrostatic Shields for Electrical Apparatus
EP0061608A1 (de) * 1981-04-01 1982-10-06 Smit Transformatoren B.V. Trockentransformator oder Drosselspule mit Luftkühlung
FR2784787A1 (fr) * 1998-10-20 2000-04-21 France Transfo Sa Transformateur sec de puissance ou de distribution de l'energie electrique
EP1133779B1 (de) 1998-11-25 2005-03-16 Siemens Aktiengesellschaft Transformator - insbesondere giessharztransformator
DE102005018615A1 (de) 2004-05-17 2005-12-08 Merck Patent Gmbh Transparente leitfähige Pigmente
US20150243409A1 (en) 2014-02-25 2015-08-27 Essex Group, Inc. Insulated winding wire containing semi-conductive layers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016202385A1 (de) 2016-02-17 2017-08-17 Siemens Aktiengesellschaft Kompakter Trockentransformator mit einer elektrischen Wicklung und Verfahren zur Herstellung einer elektrischen Wicklung
WO2017140577A1 (de) * 2016-02-17 2017-08-24 Siemens Aktiengesellschaft Kompakter trockentransformator mit einer elektrischen wicklung und verfahren zur herstellung einer elektrischen wicklung
DE102016202391A1 (de) 2016-02-17 2017-08-31 Siemens Aktiengesellschaft Kompakter Trockentransformator mit einer elektrischen Wicklung und Verfahren zur Herstellung einer elektrischen Wicklung
US11532429B2 (en) 2016-02-17 2022-12-20 Siemens Energy Global GmbH & Co. KG Dry-type transformer
DE102017221593A1 (de) * 2017-11-30 2019-06-06 Siemens Aktiengesellschaft Wicklungsanordnung
WO2020035224A1 (de) 2018-08-14 2020-02-20 Siemens Aktiengesellschaft Wicklungsanordnung mit feldglättung und armierung
EP4181160A1 (en) * 2021-11-16 2023-05-17 Huawei Digital Power Technologies Co., Ltd. Transformer and power equipment

Also Published As

Publication number Publication date
CN107039159A (zh) 2017-08-11
BR102016020804A8 (pt) 2023-04-25
BR102016020804A2 (pt) 2017-03-28

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