EP3400602B1 - Mehrschichtiger wickeltransformator - Google Patents

Mehrschichtiger wickeltransformator Download PDF

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Publication number
EP3400602B1
EP3400602B1 EP16700012.4A EP16700012A EP3400602B1 EP 3400602 B1 EP3400602 B1 EP 3400602B1 EP 16700012 A EP16700012 A EP 16700012A EP 3400602 B1 EP3400602 B1 EP 3400602B1
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EP
European Patent Office
Prior art keywords
winding
section
high voltage
radially
winding section
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EP16700012.4A
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English (en)
French (fr)
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EP3400602A1 (de
Inventor
Gianluca BUSTREO
Miljenko Hrkac
Cristiano GREGGIO
Roberto Zannol
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.)
Hitachi Energy Ltd
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ABB Power Grids Switzerland AG
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    • 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
    • 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
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads

Definitions

  • the present invention relates to an electrical transformer, in particular to a multilayer winding transformer adopting non-uniform insulation.
  • a "uniform insulation” is the insulation of a transformer winding having all its ends connected to terminals with the same rated insulation level.
  • a “non-uniform insulation” is the insulation of a transformer winding having a neutral terminal end for direct or indirect terminal to earth and designed with an insulation level which is lower than the insulation level of the line terminal.
  • the present invention is mainly focused on transformers for high or relatively high voltage applications, where disc type windings are commonly used, having a winding rated power approximately up to 25-30MVA.
  • High voltage applications typically employ transformers having disc windings.
  • the electric field between the turns and discs is distributed in such a way that the use of insulation material is minimal.
  • FIG. 1 schematically shows a common non-uniformly insulated disc winding transformer 100 having a High-Voltage (HV) winding 101 and a low-voltage (LV) winding 102 (it is to be noted that only half view is given and that the winding symmetry axis is indicated by a dotted line).
  • a clearance 107 usually named "main duct", is located between the HV winding 101 and the LV winding 102.
  • each having a defined number of turns 104', 104", ... are connected in series, to bridge the top end terminal 105, where the tension is applied, with the lower end terminal 106, which is either the earth in single phase or three phases star-connected systems or simply the Neutral in three phases star-connected systems.
  • the foregoing description shows that disc windings uniformly distribute the electrical potential mainly in the axial direction A whilst the electrical potential variation is relatively low in the radial direction R.
  • the applied electric potential at the winding top end terminal 105 is transferred, with relatively little reduction, to the same winding portion facing the Low Voltage winding (point 108 in Figure 1 ). Therefore, the main duct 107 is substantially called to withstand the High Voltage section full rated electrical potential difference with respect to the Low Voltage section.
  • the object of the present invention is therefore to provide an electrical transformer for high or relatively high voltage applications, which is alternative to common disc winding transformers featured by a sufficient compactness and a short construction time.
  • an electrical transformer winding arrangement is indicated with the reference number 1.
  • the transformer provided with the winding arrangement 1 is mainly destined to be used in high or relatively high voltage applications and in particular adopts non-uniform insulation, according to the definitions given above.
  • Electrical transformer comprises a core 20 and one or more winding assemblies mounted to the core 20 itself.
  • winding assemblies mounted to the core 20 itself.
  • the winding assembly comprises a low voltage (LV) winding 2 and a high voltage (HV) winding 3.
  • LV low voltage
  • HV high voltage
  • HV winding 2 and LV winding 3 are concentrically arranged around a core portion.
  • the representations of Figure 2 , 3, 4 and the executive view of Figure 5 show half of the winding arrangement 1 cross section, wherein the longitudinal axis, marked by a dotted line, corresponds to the winding arrangement 1 cylindrical symmetry axis.
  • the cylindrical clearance 15 between the HV winding 3 and the LV winding 2 is commonly referred to as "main duct".
  • the HV voltage winding 3 comprises a first winding section 4 and a second winding section 5, connected together by an electrical junction 6.
  • First 4 and second 5 winding sections are arranged next one to the other and coaxially along direction A of the HV winding 3.
  • the first winding section 4 can correspond to an axially top HV winding section and the second winding section 5 can correspond to an axially bottom HV winding section of the HV winding 3.
  • first winding section 4 and second winding section 5 are separated by an axial gap 10 between said sections in the HV winding axial direction A.
  • the first 4 and the second 5 winding sections are of the so-called “multilayer” or “barrel” type.
  • each of the first 4 and the second 5 winding sections comprises an electrically insulated conductor 7 wound for example over a limb supporting the HV winding 3 itself.
  • the conductor 7 is wound to form a plurality of layers 9', 9"....
  • the different layers 9', 9"... are arranged radially, i.e. along direction R, one on top to the other.
  • Each layer 9', 9"... has a predetermined number of turns 16', 16" formed by the wounded conductor 7 in the axial direction A of the HV winding.
  • the first 4 and the second 5 winding sections have the same overall number of turns (i.e.
  • the total number of turns is greater than the number of the layers so to reduce the overall radial size, which in particular can be less than the radial size of a disc winding designed for the same rated voltage and current.
  • multilayer/barrel windings require less construction time as compared to a disc winding for the same rated voltage and current.
  • both the radially innermost and outermost layers have less turns than the remaining intermediate layers.
  • the reduced number of turns at innermost and outermost layers allows to increase in the intermediate layers the electric strength by a thicker insulation of the winding edges, where the local electric field enhancement results in an increased risk of electric discharge ignition. Layers with less turns are conventionally called "graded layers".
  • the first winding section 4 comprises a first terminal 11, which is located radially external, and a second terminal 12 which is located radially internal in the first winding section 4 itself.
  • the second winding section 5 comprises a first terminal 13 which is located radially external and a second terminal 14 which is located radially internal in the second winding section 5 itself.
  • the first winding section radially external terminal 11 is normally the HV winding 3 entrance, where the electric potential is applied, and is usually connected to a line terminal of the transformer.
  • the first winding section radially external terminal 11 is located axially outward with respect to the HV winding 3 itself, such that the electric strength towards grounded parts is the highest.
  • the second winding section radially internal terminal 14 is normally the HV winding 3 exit, and can be connected to a transformer tap-changer or directly to a neutral terminal or to earth.
  • the second winding section radially internal terminal 14 is axially external with respect to the HV winding in a position which is axially opposite to the first winding section radially external terminal 11.
  • the second winding section radially internal terminal 14 is preferably located in an axially lower position both of the second winding section 5 and of the overall HV winding 3.
  • the first winding section radially internal terminal 12 is joined to the second winding section radially external terminal 13 by the electrical junction 6.
  • the first winding section radially internal terminal 12 and the second winding section radially external terminal 13 can be axially differently positioned in the respective winding section (i.e. in the axially upper or lower part of the respective section) and consequently the electrical junction 6 can be either outside the axial gap 10 (as in the embodiment depicted in Figures 2 ) or within it (as in the examples not being covered by the claimed invention depicted in Figures 3 and 4 , as well as in Figure 5 ), as will be described hereinafter.
  • the first winding section radially internal terminal 12 and the second winding section radially external terminal 13 are axially external with respect to the whole HV winding 3, and are in opposite positions.
  • the first winding section radially internal terminal 12 and the second winding section radially external terminal 13 are respectively located in the axially upper part of the HV winding 3 (and of the first winding section 4) and in the axially lower part of the HV winding 3 (and of the second winding section 5).
  • the electrical junction 6 is located outside the axial gap 10.
  • the electrical potential decays almost linearly along the turns 16', 16"... of the layers 9', 9", from the first section radially external terminal 11 down to the second section radially internal terminal 14. This happens both in a quasi-stationary regime (at a normal power frequency, i.e. 50 or 60 Hz) and during transients (typically, lighting and switching impulses during tests and normal operation).
  • the multilayer/barrel winding assembly here described can be smaller, due to the overall reduced radial dimension, and with reduced weight.
  • the winding arrangement 1 provides a substantially constant potential difference along the axial gap 10 between the first 4 and second 5 winding sections.
  • the electric potential with respect to ground decreases radially from the outside to the inside, at substantially the same rate. Therefore the electric potential difference between the first 4 and second 5 winding sections is fairly constant. This would not happen, for example, if the first section 4 radially internal terminal 12 were connected to the second section 5 radially internal terminal 14, and if the second section 5 radially external terminal 13 were connected to the earth, or to the transformer neutral terminal or to the tap changer. In this case there would be almost the total rated winding voltage across the axial gap 10, in correspondence of the winding sections outer edges that face the axial gap 10.
  • the number of layers of each of the first 4 and second 5 winding section is even.
  • the number of layers of each of the first 4 and second 5 winding section is odd.
  • the first 4 and the second 5 winding sections can be differently configured and connected. Examples of this configuration are given in Figures 3-4 .
  • the electrical junction 6 can be located in the axial gap 10.
  • graded layers are preferably located both in the first 4 and in the second 5 winding sections, respectively in the outermost and innermost layers, in order to decrease the electric stress located at the winding sections edges facing the axial gap 10 (see example not being covered by the claimed invention in Figure 4 ) and in correspondence of the electrical junction 6 between the winding sections.
  • the number of turns can be the same in each layer (see example not being covered by the claimed invention in Figure 3 ).
  • the executive arrangement shown in Figure 5 corresponds to the example not being covered by the claimed invention schematically shown in Figure 4 . It is to be noted that only half of the winding arrangement, in section, is depicted, and that the dotted line represents the symmetric axis.
  • Figure 4 shows that the radially innermost layer and the radially outermost layer of each of the first 4 and the second 5 sections have a number of turns lower than the number of turns of the intermediate layers.
  • the electrical junction 6, preferably embodied by a bent conductor 22, still more preferably wrapped by a convenient amount of creep paper, is located in the axial gap 10 between the first 4 and the second 5 sections.
  • Figure 6 shows an enlarged view of a portion of the HV winding 3 according to the example not being covered by the claimed invention of Figure 5 , where the conductor 22 forming the electrical junction 6 is located.
  • the conductor 22 extends in the axial gap 10 and, starting from the second section radially external terminal 13, is curved in axial direction towards the first winding section 4 (not shown in Figure 6 ), and radially towards the transformer core (not shown in Figure 6 ) since the first section radially internal terminal 12 is radially internal with respect to the second section radially external terminal 13.

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

Claims (7)

  1. Elektrischer Transformator umfassend einen Kern (20) und eine oder mehrere an dem Kern montierte Wicklungsbaugruppen, wobei jede Wicklungsbaugruppe eine Niederspannungswicklung (2) und eine Hochspannungswicklung (3) umfasst,
    wobei die Hochspannungswicklung (3) einen ersten Wicklungsabschnitt (4) und einen zweiten Wicklungsabschnitt (5), konsekutiv in der axialen Richtung (A) der Hochspannungswicklung (3) angeordnet und durch eine elektrische Verbindung (6) verbunden, umfasst, wobei der erste (4) und der zweite (5) Wicklungsabschnitt isolierte Leiter (7) in Mehrschichtanordnungen umfassen, wobei mehrere Leiterschichten (9', 9"...), wobei jede eine oder mehrere Windungen (16', 16"...) in der axialen Richtung (A) aufweist, aufeinander in der radialen Richtung (R) der Hochspannungswicklung (3) gewickelt sind, wobei jeder des ersten (4) und des zweiten (5) Wicklungsabschnitts einen radial externen Anschluss (11, 13) und einen radial internen Anschluss (12, 14) aufweisen, wobei:
    - der radial interne Anschluss (12) des ersten Wicklungsabschnitts (4) mit dem radial externen Anschluss (13) des zweiten Wicklungsabschnitts (5) durch die elektrische Verbindung (6) verbunden ist;
    - der radial externe Anschluss (11) des ersten Wicklungsabschnitts (4) der Eingang der Hochspannungswicklung (3) ist;
    - der radial interne Anschluss (14) des zweiten Wicklungsabschnitts (5) der Ausgang der Hochspannungswicklung (3) ist,
    wobei der erste Wicklungsabschnitt (4) und der zweite Wicklungsabschnitt (5) so angeordnet sind, dass sie einen axialen Spalt (10) in der axialen Richtung (A) der Hochspannungswicklung (3) bilden,
    wobei der radial interne Anschluss (12) des ersten Wicklungsabschnitts (4) axial extern bezüglich der Hochspannungswicklung (3) ist und der radial externe Anschluss (13) des zweiten Wicklungsabschnitts (5) axial extern bezüglich der Hochspannungswicklung (3) ist, axial gegenüber dem radial internen Anschluss (12) des ersten Wicklungsabschnitts (4),
    wobei die elektrische Verbindung (6) zwischen dem ersten (4) und dem zweiten (5) Wicklungsabschnitt sich außerhalb des axialen Spalts (10) befindet,
    wobei die Anzahl von Schichten (9', 9"...) jedes des ersten (4) und des zweiten (5) Wicklungsabschnitts gerade ist.
  2. Elektrischer Transformator nach Anspruch 1, wobei die Hochspannungswicklung (3) und die Niederspannungswicklung (2) konzentrisch angeordnet sind.
  3. Elektrischer Transformator nach Anspruch 1 oder 2, wobei der erste Wicklungsabschnitt (4) und der zweite Wicklungsabschnitt (5) die gleiche Anzahl von Windungen (16', 16"...) aufweisen.
  4. Elektrischer Transformator nach einem der vorhergehenden Ansprüche, wobei in jedem des ersten (4) und des zweiten (5) Wicklungsabschnitts die Anzahl von Windungen (16', 16"...) von jeder der Schichten (9', 9"...) größer ist als die Gesamtzahl von Schichten.
  5. Elektrischer Transformator nach einem Anspruch 1-4, wobei in jedem des ersten (4) und des zweiten (5) Wicklungsabschnitts jede Schicht (9', 9"...) die gleiche Anzahl von Windungen (16', 16"...) aufweist.
  6. Elektrischer Transformator nach einem Anspruch 1-4, wobei in jedem des ersten (4) und des zweiten (5) Wicklungsabschnitts die radial innerste Schicht und die radial äußerste Schicht eine Anzahl von Windungen (16', 16"...) kleiner als die Anzahl von Windungen (16', 16"...) der dazwischenliegenden übrigen Schichten aufweisen.
  7. Elektrischer Transformator nach einem der vorhergehenden Ansprüche, wobei der radial externe Anschluss (11) des ersten Wicklungsabschnitts (4) axial extern bezüglich der Hochspannungswicklung (3) ist und der radial interne Anschluss (14) des zweiten Wicklungsabschnitts (5) axial extern bezüglich der Hochspannungswicklung (3) ist, axial gegenüber dem radial externen Anschluss (11) des ersten Wicklungsabschnitts.
EP16700012.4A 2016-01-04 2016-01-04 Mehrschichtiger wickeltransformator Active EP3400602B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/050034 WO2017118472A1 (en) 2016-01-04 2016-01-04 Multilayer winding transformer

Publications (2)

Publication Number Publication Date
EP3400602A1 EP3400602A1 (de) 2018-11-14
EP3400602B1 true EP3400602B1 (de) 2021-09-01

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EP16700012.4A Active EP3400602B1 (de) 2016-01-04 2016-01-04 Mehrschichtiger wickeltransformator

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EP (1) EP3400602B1 (de)
WO (1) WO2017118472A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020123903A1 (de) * 2020-09-14 2022-03-17 Seg Automotive Germany Gmbh Stator für eine elektrische Maschine
WO2023088559A1 (en) * 2021-11-18 2023-05-25 Hitachi Energy Switzerland Ag Multi-helical windings for a transformer
CN116525266A (zh) * 2023-06-15 2023-08-01 新昇电气有限公司 一种兼具体积有效填充率及散热的包封式变压器线圈

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Publication number Priority date Publication date Assignee Title
US3675175A (en) * 1971-05-10 1972-07-04 Gen Electric High voltage coil assembly for electric induction apparatus
CA1113161A (en) * 1977-11-18 1981-11-24 General Electric Company High voltage winding for dry type transformer

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EP3400602A1 (de) 2018-11-14
WO2017118472A1 (en) 2017-07-13

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