EP4599469A1 - Bobine multicouche isolée électriquement pour transformateur électrique - Google Patents
Bobine multicouche isolée électriquement pour transformateur électriqueInfo
- Publication number
- EP4599469A1 EP4599469A1 EP23786245.3A EP23786245A EP4599469A1 EP 4599469 A1 EP4599469 A1 EP 4599469A1 EP 23786245 A EP23786245 A EP 23786245A EP 4599469 A1 EP4599469 A1 EP 4599469A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- overflow
- length
- electrically insulating
- short
- long
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
-
- 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
- H01F27/323—Insulation between winding turns, between winding layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
- H01F2005/022—Coils wound on non-magnetic supports, e.g. formers wound on formers with several winding chambers separated by flanges, e.g. for high voltage applications
Definitions
- the present invention relates to the technical field of electrical transformers and more particularly multilayer coils for electrical transformers.
- a transformer of this type comprises a multilayer coil (10) such as that shown in Figure [Fig.1].
- the coil (10) generally comprises an electrically conductive part (101) and an electrically insulating part (102).
- the electrically conductive part (101) comprises several electrically conductive layers.
- Each of the electrically conductive layers comprises a conductive wire wound spirally around an axis (A0) and extending axially from a first plane orthogonal to said axis to a second plane orthogonal to said axis.
- the electrically conductive layers being arranged coaxially around each other.
- the electrically insulating part (102) comprises several electrically insulating layers. Each of the electrically insulating layers is arranged between two of the electrically conductive layers so as to insulate the two electrically conductive layers from each other. In practice, each of the electrically insulating layers can be in the form of several superimposed insulating sub-layers of the same length.
- the electrically insulating layer comprises a first and a second overflow zone extending axially, over a first, respectively second, overflow length in an axial direction, beyond the first, respectively second, orthogonal plane of the longest two called electrically conductive layers. These overflow zones are arranged so as to limit the creation of electric arcs between the electrically conductive layers at the ends of the coil (10). This overflow length is identical for all layers. Also, the overflow zones prevent the conductive wire from slipping out of the spool, under the effect of the mechanical tension applied by the machine during winding.
- the latter is arranged in a pressure enclosure into which an electrically insulating fluid is injected so as to envelop the coil.
- These fluids can be of the oil or gas type.
- the invention aims to provide a multilayer coil for an electrical transformer suitable for the use of insulating fluids having a dielectric strength lower than that of sulfur hexafluoride and preferably less polluting than conventional insulating fluids .
- the solution proposed by the invention is a coil for an electrical transformer comprising:
- the electrically insulating layers are divided into a group with short overflows and a group with long overflows,
- the first overflow length and the second overflow length of the electrically insulating layers of said short overflow group are between forty and one hundred times the diameter of said conductive wire
- the first overflow length and the second overflow length of the electrically insulating layers of said group with long overflows are between one hundred and twenty and three hundred and twenty times the diameter of said conductive wire.
- the short overflow group is composed of short overflow subgroups of two to four consecutive electrically insulating layers
- the long overflow group is composed of long overflow subgroups of two to four consecutive electrically insulating layers
- the insulating part being formed of an alternation between short overflow subgroups and long overflow subgroups.
- the conductive wire of each electrically conductive layer has a diameter
- the electrically insulating layers are distributed into a group with a first short overflow and a second long overflow, and a group with a first long overflow and a second short overflow,
- the first overflow length of the electrically insulating layers of the group with first short overflow and second long overflow, and the second length of overflow of the electrically insulating layers of the group with first long overflow and second short overflow are between forty and one hundred times the diameter of said conductive wire
- the second overflow length of the electrically insulating layers of the group with first short overflow and second long overflow, and the first overflow length of the electrically insulating layers of the group with first long overflow and second short overflow are between one hundred and twenty and three hundred and twenty times the diameter of the conductive wire.
- Figures [Fig.1] to [Fig.9] do not reflect the actual dimensions of the components.
- the dimensions of certain elements could in particular be enlarged or reduced in order to facilitate the reader's understanding.
- the ratio of overflow length and diameter of the conductive wire presented in the figures does not reflect reality.
- the coil (1) can comprise between 50 and 150 electrically conductive layers (1 li).
- Each of said electrically conductive layers (1 li) comprises a conductive wire (111).
- the conductive wire (111) is preferably an enameled conductive wire.
- the conductive wire (111) preferably comprises a core made of copper, but can be made of aluminum or any other conductive material suitable for those skilled in the art.
- the conductive wire (111) of each electrically conductive layer (1 li) may have a diameter (D). The latter can be between 0.125 mm and 0.3 mm.
- the conductive wire (111) is wound spirally around an axis (A) and extending axially from a first plane (Pli) orthogonal to the axis (A) to a second plane (P2i) orthogonal to the axis (A).
- the electrically conductive layers (1 li) are arranged coaxially around each other.
- Each turn of conductive wire (111) in the electrically conductive layer (1 li) is called a turn.
- the number of turns can be between 1 and 2500. In certain embodiments such as those shown in Figures [Fig.2] to [Fig.6] and [Fig.9] , the number of turns can decrease from the conductive layer (1 la) closest to the axis towards the conductive layer furthest from the axis. The number of turns can decrease linearly as in the embodiments shown in Figures [Fig.2] to [Fig.6]. This type of coil is generally called a “trapezoidal coil”.
- variables “j” or “k” can be used in a similar way.
- Each electrically insulating layer (12i) comprises one or more electrically insulating materials of the polyester film type partially covered on both sides with glue, or others.
- the insulating material has a dielectric rigidity greater than 50 kV/mm.
- Each of the electrically insulating layers (12i) is arranged between two of the electrically conductive layers (1 li) so as to insulate the two said electrically conductive layers from each other.
- an electrically insulating layer (12i) can be produced by winding a strip of electrically insulating material around an electrically conductive layer.
- the strip of electrically insulating material can have a width of between 50 mm and 350 mm and a thickness of between 20 pm and 50 pm.
- the winding can be done edge to edge or with an overlap.
- the electrically insulating layer (12i) may comprise several superimposed windings of the same insulating material or of different insulating materials.
- the electrically insulating layer (12i) comprises 2 to 4 superimposed windings.
- Each electrically insulating layer (12i) comprises and is extended by a first overflow zone extending, axially, over a first overflow length (L 1 i), beyond the first orthogonal plane (Pli) of the longest of the two adjoining electrically conductive layers (1 li).
- the electrically insulating layers (12i) are of generally cylindrical shape and said electrically insulating layers (12i) are arranged coaxially around each other and overlap at least partially axially.
- the electrically insulating layer (12a) comprises a first overflow zone extending, axially, over a first overflow length (Lia), beyond the first orthogonal plane (P la) of the longest electrically conductive layer (l ia) of the two adjoining electrically conductive layers (lia, 11b). It is the same :
- the second overflow length (L2i) is greater than forty times the diameter (D) of the conductive wire.
- the second overflow length (L2i) is greater than seventy times the diameter (D) of the conductive wire.
- the electrical transformer is remarkable in that the first overflow length (Llj), and/or the second length of overflow (L2j), of at least one first electrically insulating layer (12j) is greater than the overflow length (Llk), and/or the second overflow length (L2k), of at least one other electrically insulating layer ( 12k).
- the first overhang length and the second overhang length (Lli, L2i) of each electrically insulating layer (12i) is between forty and three hundred and twenty times the diameter (D) of the conductive wire (111).
- Each electrically insulating layer (12i) may include:
- short overflow we mean the fact that the overflow length (Lli, L2i) of the electrically insulating layer is between forty and one hundred times the diameter (D) of the conductive wire (111).
- the short overhangs can have different lengths as in the exemplary embodiments shown in Figures [Fig.1] to [Fig.6], [Fig.8] and [Fig.9], In alternative embodiments, and as in the exemplary embodiment shown in figure [Fig.7], the short overhangs can all have the same length. Thus, it is for example possible to keep conventional overflows as short overflows and to lengthen certain overflows to make them long overflows. In other embodiment variants not shown, some short overhangs may have the same length, others not.
- the electrically insulating layers (12i) are distributed into a group with short overflows (122) and a group with long overflows (121). Which means :
- the first overflow length (Llj) and the second overflow length (L2j), of the electrically insulating layers (12j) of the short overflow group (122) is between forty and one hundred times the diameter (D) of the conductive wire ( 111), and
- the short overflow group (122) can be composed of short overflow subgroups of two to four consecutive electrically insulating layers (12j).
- the long overflow group (121) can be composed of long overflow subgroups of two to four consecutive electrically insulating layers (12k).
- the insulating part (12) is formed from an alternation between short overflow subgroups and long overflow subgroups.
- the short overflow group (122) is composed of:
- the group with first short overflow and second long overflow (123) is composed of subgroups with first short overflow and second long overflow of two to four consecutive electrically insulating layers (12j).
- the group with first long overflow and second short overflow (124) is composed of subgroups with first long overflow and second short overflow of two to four consecutive electrically insulating layers (12k).
- the insulating part (12) is formed from an alternation between subgroups with a first short overflow and a second long overflow and subgroups with a first long overflow and a second short overflow.
- the group with first long overflow and second short overflow (124) is composed of three subgroups with first long overflow and second short overflow, each of three consecutive electrically insulating layers (12j).
- the overflow lengths gradually increase or decrease.
- This electrical transformer can be a measurement transformer intended to power measuring devices, meters, relays and other similar devices.
- this transformer can be a voltage transformer.
- This transformer can also be a power transformer.
- the electrical transformer can be single-phase or three-phase.
- the electrical transformer includes an enclosure.
- This enclosure is preferably metallic, but can also be made of any material suitable for those skilled in the art.
- the enclosure preferably has a cylindrical shape, but can also be of any shape suitable to those skilled in the art.
- the transformer also includes an electrically insulating fluid arranged inside the enclosure and enveloping the coil (1).
- This electrically insulating fluid can be of the oil type such as those described in the IEC60296 standard, insulating liquid such as those described in the IEC60867 standard, sulfur hexafluoride (SF6), or any other electrically insulating fluid suitable for those skilled in the art.
- the fluid used is of the oxygen, dinitrogen, carbon dioxide, fluoronitrile, fluoroketone, mixture of fluoronitrile or fluoroketone with oxygen or dinitrogen or carbon dioxide, or a mixture of sulfur hexafluoride with a large quantity of dinitrogen, etc.
- the insulating fluid has a dielectric rigidity greater than 2 kV/mm.
- the fluid can be placed under pressure inside the enclosure. In particular, the pressure of the fluid can be between 3.5 bar rel and 6.3 bar rel.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2210274A FR3140705A1 (fr) | 2022-10-07 | 2022-10-07 | Bobine multicouche isolée électriquement pour transformateur électrique. |
| PCT/EP2023/077804 WO2024074719A1 (fr) | 2022-10-07 | 2023-10-07 | Bobine multicouche isolée électriquement pour transformateur électrique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4599469A1 true EP4599469A1 (fr) | 2025-08-13 |
Family
ID=85122936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23786245.3A Pending EP4599469A1 (fr) | 2022-10-07 | 2023-10-07 | Bobine multicouche isolée électriquement pour transformateur électrique |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4599469A1 (fr) |
| CN (1) | CN120092309A (fr) |
| FR (1) | FR3140705A1 (fr) |
| WO (1) | WO2024074719A1 (fr) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US880838A (en) * | 1905-04-17 | 1908-03-03 | Chester H Thordarson | High-potential transformer. |
| US1062046A (en) * | 1908-01-10 | 1913-05-20 | Westinghouse Electric & Mfg Co | Electrical apparatus. |
| FR656838A (fr) * | 1928-06-30 | 1929-05-14 | Mandrin pour bobinage à très faible capacité répartie | |
| US3573694A (en) * | 1969-10-28 | 1971-04-06 | Gen Electric | High voltage transformer for television receivers |
| JPS592572A (ja) * | 1982-06-28 | 1984-01-09 | Denki Onkyo Co Ltd | 高圧発生装置 |
| DE8913444U1 (de) * | 1989-11-14 | 1990-01-25 | Bremi Auto-Elektrik Bremicker GmbH + Co, 5883 Kierspe | Zündspule für Verbrennungsmotore |
| FR2700884B1 (fr) * | 1993-01-28 | 1995-04-21 | Sagem Allumage | Bobinot d'enroulement secondaire de bobine d'allumage pour moteur à combustion interne. |
-
2022
- 2022-10-07 FR FR2210274A patent/FR3140705A1/fr active Pending
-
2023
- 2023-10-07 CN CN202380071178.2A patent/CN120092309A/zh active Pending
- 2023-10-07 EP EP23786245.3A patent/EP4599469A1/fr active Pending
- 2023-10-07 WO PCT/EP2023/077804 patent/WO2024074719A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024074719A1 (fr) | 2024-04-11 |
| CN120092309A (zh) | 2025-06-03 |
| FR3140705A1 (fr) | 2024-04-12 |
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Legal Events
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 17P | Request for examination filed |
Effective date: 20250504 |
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Owner name: SUPERGRID INSTITUTE Owner name: GE VERNOVA TECHNOLOGY GMBH |
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| DAX | Request for extension of the european patent (deleted) |