EP3400602A1 - Multilayer winding transformer - Google Patents
Multilayer winding transformerInfo
- Publication number
- EP3400602A1 EP3400602A1 EP16700012.4A EP16700012A EP3400602A1 EP 3400602 A1 EP3400602 A1 EP 3400602A1 EP 16700012 A EP16700012 A EP 16700012A EP 3400602 A1 EP3400602 A1 EP 3400602A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding
- high voltage
- section
- winding section
- radially
- 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
Links
- 238000004804 winding Methods 0.000 title claims abstract description 194
- 239000004020 conductor Substances 0.000 claims abstract description 11
- 230000000712 assembly Effects 0.000 claims abstract description 4
- 238000000429 assembly Methods 0.000 claims abstract description 4
- 238000009413 insulation Methods 0.000 description 10
- 230000007935 neutral effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
-
- 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.
- Figure 1 shows schematically a winding arrangement of a disc winding transformer according to the known art
- Figure 2 shows schematically a winding arrangement of a multilayer winding transformer according to a possible embodiment of the invention
- Figure 3 shows schematically a winding arrangement of a multilayer winding transformer according to a further possible embodiment of the invention
- Figure 4 shows schematically a winding arrangement of a multilayer winding transformer according to a possible embodiment of the invention
- Figure 5 shows a schematic partial sectional view of a possible executive arrangement of the multilayer winding transformer according to the embodiment shown in Figure 4;
- Figure 6 shows an enlarged perspective view of a portion of the transformer shown in Figure 5.
- 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
- FIG. 1 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.
- the so arranged first winding section 4 and second winding section 5, advantageously, 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 sum of turns of all the layers). Still more advantageously, in each of the first 4 and the second 5 winding sections 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 embodiments 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. Indeed, as explained above, in both 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 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 embodiment 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 embodiment in Figure 3).
- FIG. 5 The executive arrangement shown in Figure 5 corresponds to the embodiment 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.
- Figure 6 shows an enlarged view of a portion of the HV winding 3 according to the embodiment 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.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
Description
Claims
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 true EP3400602A1 (en) | 2018-11-14 |
EP3400602B1 EP3400602B1 (en) | 2021-09-01 |
Family
ID=55069881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16700012.4A Active EP3400602B1 (en) | 2016-01-04 | 2016-01-04 | Multilayer winding transformer |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3400602B1 (en) |
WO (1) | WO2017118472A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020123903A1 (en) * | 2020-09-14 | 2022-03-17 | Seg Automotive Germany Gmbh | Stator for an electric machine |
WO2023088559A1 (en) * | 2021-11-18 | 2023-05-25 | Hitachi Energy Switzerland Ag | Multi-helical windings for a transformer |
CN116525266A (en) * | 2023-06-15 | 2023-08-01 | 新昇电气有限公司 | Encapsulated transformer coil with effective filling rate and heat dissipation |
Family Cites Families (2)
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 |
-
2016
- 2016-01-04 WO PCT/EP2016/050034 patent/WO2017118472A1/en active Application Filing
- 2016-01-04 EP EP16700012.4A patent/EP3400602B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3400602B1 (en) | 2021-09-01 |
WO2017118472A1 (en) | 2017-07-13 |
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