EP2784791B1 - Aktiver Teil eines Trockenverteilungstransformators - Google Patents

Aktiver Teil eines Trockenverteilungstransformators Download PDF

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Publication number
EP2784791B1
EP2784791B1 EP13460018.8A EP13460018A EP2784791B1 EP 2784791 B1 EP2784791 B1 EP 2784791B1 EP 13460018 A EP13460018 A EP 13460018A EP 2784791 B1 EP2784791 B1 EP 2784791B1
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EP
European Patent Office
Prior art keywords
active part
bobbin
coil
transformer according
dry transformer
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.)
Active
Application number
EP13460018.8A
Other languages
English (en)
French (fr)
Other versions
EP2784791A1 (de
Inventor
Jedrzej Banaszczyk
Andrzej RYBAK
Lukasz Bachorz
Claudio IBARRA
Joel Kern
Charles Johnson
Thomas Hartmann
Thorsten Steinmetz
Martin Carlen
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 Technology AG
Original Assignee
ABB Technology AG
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Publication date
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to EP13460018.8A priority Critical patent/EP2784791B1/de
Priority to PCT/EP2014/000567 priority patent/WO2014154320A1/en
Publication of EP2784791A1 publication Critical patent/EP2784791A1/de
Application granted granted Critical
Publication of EP2784791B1 publication Critical patent/EP2784791B1/de
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
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/325—Coil bobbins
    • 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 present invention relates to an active part of a dry-type distribution transformer having liquid-hardenable transformer insulation system with electrical field control.
  • One of the areas in the insulation system of the dry transformer where the electrical stresses are particularly high is the vicinity of the HV winding edges.
  • the high electrical stress in this area can be reduced by winding the coil into a bobbin with permittivity higher than the permittivity of the surrounding insulation. This moves the high electrical field away from the winding edges and into the solid insulation, which leads to a device of smaller size and weight and allowing for savings on construction materials.
  • the composite bobbin forms a rigid and stable support for the HV winding and the winding process of both LV and HV windings can be carried out separately, shortening the manufacturing process.
  • the coil body comprised a wound conductor, an insulating material attached to the wound conductor and a field control layer arrangement for reducing the maximum field strength of an electric field generated in the coil.
  • a supporting U-shaped device in the form of a ring with sidewalls for supporting the wound conductor is provided. At least one first field control layer of the field control layer arrangement is applied at edges of the wound conductor. At least one second field layer arrangement of the field control layer is provided to the supporting device.
  • An active part of a dry-type transformer according to present the invention is defined in present claim 1.
  • the internal edges of the annular discs are rounded.
  • the HV coil is placed in the space of the bobbin between the annular discs and the external surface of the resistive layer, and the external edges of the annular discs protrude outside the external surface of the side walls of the HV coil.
  • the external edges of the annular discs protruding outside the external surface of the side walls of the HV coil are rounded.
  • the resistive layer is tightly abutted the external surface of the cylinder of the bobbin.
  • the resistive layer is made from conductive paint dotted by carbon black.
  • an air gap is situated which is free of an electric field generated by LV coils and HV coils of the transformer, having a thickness d1 bigger than zero.
  • a thickness d4 of the cylindrical wall of the bobbin is equal or bigger than a thickness d5 of the discs of the bobbin.
  • a thickness d4 of the cylindrical wall of the bobbin is lower than a thickness d5 of the discs of the bobbin.
  • the insulating body is made from a thermoplastic material or a thermosetting material.
  • the insulating body is performed as a whole body for at least two limbs of the same core of the transformer.
  • a dry transformer according to the present invention is characterized in that it has an active part according the claims 1-11.
  • the solution according to the invention allows for lower the electrical stress in the dry transformer insulation system design.
  • the combination of the use of three different field control techniques including metallization of the transformer body, coating of the HV coil winding bobbin with a resistive layer and carried out the HV coil winding bobbin from a higher permittivity composite in comparison with the insulating system renders the new design of the active part of the dry transformer as more compact. Reduction of the size, the weight and the cost of the material is possible. This allows for successful targeting of the market with dry type resin insulated units of the same electrical parameters comparable to oil insulated ones and also in dry type of the distribution transformer because it allows to make it more compact than conventional dry-type transformers with air-gap between LV and HV coils.
  • fig. 1 is a schematic cross-section of the active part of one phase of a dry transformer
  • fig.2 - presents the detail "a" from fig.1 in enlargement
  • fig.3 - presents a schematic cross-section of the active part of two adjacent phases of a dry transformer.
  • the active part of a dry distribution transformer comprises a transformer core 1 with two yokes 2 and two core limbs 3 with a longitudinal axis A.
  • LV (Low Voltage) coils 4 are wound concentrically and a winding bobbin 5 is placed concentrically.
  • the bobbin 5 has a shape of a longitudinal cylinder 5a with annular discs 5b on the ends of the cylinder 5a.
  • the discs 5b protrudes outside the cylinder 5b in an outward direction of the core 1 and their ends are rounded. Also the internal edges of the annular discs are rounded.
  • Between the discs 5b HV (High Voltage) coils 6 are wound on an external surface of the cylinder 5a, which is covered by an electrical resistive layer 7.
  • the resistive layer 7 forms a shield for control an electric fields around the limb 3 and LV and HV coils.
  • the resistive layer 7 is tightly abutted the external and/or internal surface of the cylinder 5a and it is made from conductive paint dotted by carbon black.
  • the resistive layer 7 is indicated on the drawing only on the external surface of the cylinder 5a but it can be placed also only on the internal surface of the cylinder 5a or on both side surfaces of the cylinder 5a.
  • the external edges of the annular discs 5b protruding outside the external surface of the side walls of the HV coils 6 are rounded.
  • the limb 3, the coils 4 and the bobbin 5 with the coils 6 are located in an electrical insulating body 8 surrounding the core 1 along its limb 3.
  • the insulating body may be a thermoplastic material or a thermosetting material.
  • a permittivity of the insulating body 8 is 2-5 times lower than the permittivity of the insulating bobbin 5.
  • the dielectric strength of the air gap 9 is significantly lower than that of the insulating body 8. This hampers the size reduction of dry transformers, as the thickness d1 of the air gap 9 must be sufficient to prevent electrical breakdown.
  • a metallic layer 10 is deposited on the frontal external faces of the insulating body 8, perpendicular to the axis A of the limb 3.
  • the metallic layer 10 is made from thermal sprayed zinc.
  • the metallic layer has thickness d2 and electrical conductivity ⁇ such that the electric field generated in the coils 4 and 6 of the transformer is entirely restricted to the insulating body 8, thus making it possible to minimize the thickness d1, and in consequence to significantly reduce the size of the active part of the transformer.
  • the electric field intensity in the electrical insulating body 8 rises, increasing the electrical stress near the edges of the HV winding 6, and also in the space between the external surface 5a of the winding bobbin 5 and the external frontal surface 8 of the electrical insulating body 8.
  • the thickness d3 of the space between the external surface of the disc 5b and the frontal surface of the insulating body 8 must be kept sufficient to prevent electrical failure.
  • the dry insulation body 8 is carried out for more than one phase of the transformer.
  • the whole insulation body 8' is made for at least two limbs 3 as one body and it is placed on the limbs by sliding over on the limbs when one of the yokes is removed from the core.
  • the bobbin 5 may be performed in two forms.
  • the first form is where the thickness d4 of a wall of the cylinder 5a is equal or bigger than the thickness d5 of the disc 5b.
  • the second form the thickness d4 of a wall of the cylinder 5a is lower than the thickness d5 of the disc 5b.
  • the right choice of such parameters is dependent on electrical parameter of the transformer and on the condition of exploitation of it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Claims (12)

  1. Ein aktiver Teil eines Trockenverteilungstransformators, worin der aktive Teil einen Kern (1) mit einem Joch (2) und Säulen (3) die eine Längsachse (A) haben, um welche eine Niedervolt-Wicklung (4) und eine Spule (5), die einen Bestandteil des aktiven Teils bildet, konzentrisch angeordnet sind; die Spule (5) hat die Form eines längs verlaufenden Zylinders (5a), der mit ringförmigen Scheiben (5b) abgeschlossen ist, welche außen über die Wand des Zylinders (5a) in auswärtiger Richtung in Beziehung zur Säule (3) hinausragen und zwischen denen eine Hochvolt-Wicklung (6), die einen Bestandteil des aktiven Teils bildet, angeordnet ist, und die Spule (5) ist aus einem Material mit einer dielektrischen Leitfähigkeit, die zwei- bis fünfmal höher ist als die dielektrische Leitfähigkeit des sie umgebenden Isoliermaterials (8), das einen Bestandteil des aktiven Teils bildet und das die Säule (3) um die Achse (A) einschließt, in die die Niedervolt-Wicklung (4), die Hochvolt-Wicklung (6) und die Spule (5) mit den ringförmigen Scheiben (5b) eingebettet sind, dadurch gekennzeichnet, dass die äußeren Ansichtsflächen des Isoliermaterials (8), das die Induktionsspule umgibt, jede von ihnen in einer Ebene senkrecht zur Achse (A) angeordnet, mit einer Metallschicht (10) versehen sind, die eine solche Leitfähigkeit hat, dass der Teil des Isoliermaterials (8) zwischen einer inneren Oberfläche der Metallschicht (10) und einer äußeren Oberfläche der jeweils anschließenden ringförmigen Scheibe (5b) eine Dicke (d3) hat, die zur elektrischen Isolation ausreichend ist, und dass eine seitliche Oberfläche des Zylinders (5a) mit einer elektrisch widerstehenden Schicht (7) bedeckt ist, die eine Abschirmung eines elektrischen Feldes um die Säule (3) des Kerns (1) sowie der Hochvolt-Wicklung (6) und der Niedervolt-Wicklung (4) darstellt.
  2. Ein aktiver Teil eines Trockenverteilungstransformators gemäß Anspruch 1, dadurch gekennzeichnet, dass die inneren Ränder der ringförmigen Scheiben (5b) abgerundet sind.
  3. Ein aktiver Teil eines Trockenverteilungstransformators gemäß den Ansprüchen 1 - 2, dadurch gekennzeichnet, dass die Hochvolt-Wicklung (6) in dem Zwischenraum der Spule (5) zwischen den ringförmigen Scheiben (5b) und der äußeren Oberfläche der Widerstandsschicht (7) angeordnet ist und dass die äußeren Ränder der ringförmigen Scheiben (5b) außen über die äußere Oberfläche der Seitenwände der Hochvolt-Wicklung (6) herausragen.
  4. Ein aktiver Teil eines Trockenverteilungstransformators gemäß Anspruch 3, dadurch gekennzeichnet, dass die äußeren Ränder der ringförmigen Scheiben (5b), die außen über die äußere Oberfläche der Seitenwände der Hochvolt-Wicklung (6) herausragen, abgerundet sind.
  5. Ein aktiver Teil eines Trockenverteilungstransformators gemäß irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass sich die Widerstandsschicht (7) dicht an die äußere Oberfläche des Zylinders (5a) anlegt.
  6. Ein aktiver Teil eines Trockenverteilungstransformators gemäß irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Widerstandsschicht (7) aus leitfähiger, schwarz gepunkteter Kohlefarbe besteht.
  7. Ein aktiver Teil eines Trockenverteilungstransformators gemäß irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass zwischen der äußeren Oberfläche der Metallschicht (10), die auf der vorderen Oberfläche des Isoliermaterials angeordnet ist, und einer inneren Oberfläche des Joches (2) sich ein Luftspalt (9) befindet, der frei von einem elektrischen Feld ist, das durch die Wicklungen (4) und (6) des Transformators erzeugt wird, und der eine Dicke "d1" größer als null hat.
  8. Ein aktiver Teil eines Trockenverteilungstransformators gemäß den Ansprüchen 1 - 7, dadurch gekennzeichnet, dass die Dicke "d4" der zylindrischen Wand der Spule (5) größer oder gleich der Dicke "d5" der Scheiben (5b) der Spule (5) ist.
  9. Ein aktiver Teil eines Trockenverteilungstransformators gemäß den Ansprüchen 1 - 7, dadurch gekennzeichnet, dass die Dicke "d4" der zylindrischen Wand der Spule (5) geringer als die Dicke "d5" der Scheiben (5b) der Induktionsspule (5) ist.
  10. Ein aktiver Teil eines Trockenverteilungstransformators gemäß irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Isoliermaterial (8) aus thermoplastischem oder hitzehärtbarem Material hergestellt ist.
  11. Ein aktiver Teil eines Trockenverteilungstransformators gemäß irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Isoliermaterial (8) als ganzes Gussstück (8') für wenigstens zwei Säulen (3) des gleichen Kerns (1) ausgeführt ist.
  12. Ein Trockenverteilungstransformator, dadurch gekennzeichnet, dass er einen aktiven Teil gemäß den Ansprüchen 1 - 11 besitzt.
EP13460018.8A 2013-03-29 2013-03-29 Aktiver Teil eines Trockenverteilungstransformators Active EP2784791B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13460018.8A EP2784791B1 (de) 2013-03-29 2013-03-29 Aktiver Teil eines Trockenverteilungstransformators
PCT/EP2014/000567 WO2014154320A1 (en) 2013-03-29 2014-03-05 An active part of a dry-tpye distribution transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13460018.8A EP2784791B1 (de) 2013-03-29 2013-03-29 Aktiver Teil eines Trockenverteilungstransformators

Publications (2)

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EP2784791A1 EP2784791A1 (de) 2014-10-01
EP2784791B1 true EP2784791B1 (de) 2015-07-29

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WO (1) WO2014154320A1 (de)

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* Cited by examiner, † Cited by third party
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CN106934166B (zh) * 2017-03-20 2020-11-03 广东电网有限责任公司电力科学研究院 一种超高压变压器等效短路模型构建方法及装置
DE102018213661A1 (de) * 2018-08-14 2020-02-20 Siemens Aktiengesellschaft Wicklungsanordnung mit Feldglättung und Armierung
JP2021019206A (ja) * 2019-07-23 2021-02-15 ソーラーエッジ テクノロジーズ リミテッド 変圧器

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JP3422252B2 (ja) * 1998-04-22 2003-06-30 株式会社日立製作所 高電圧トランスおよびそれを用いた点火トランス
EP2400510A1 (de) * 2010-06-28 2011-12-28 ABB Research Ltd. Transformatorspule mit leitfähiger elektrischer Abschirmung
WO2012000983A1 (en) * 2010-06-28 2012-01-05 Abb Technology Ag Transformer with shielding rings in windings
WO2012000985A1 (en) 2010-06-28 2012-01-05 Abb Research Ltd Transformer with field control layer arrangement

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EP2784791A1 (de) 2014-10-01

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