EP0923783A1 - Single coil constitutive of windings for air-core transformers - Google Patents
Single coil constitutive of windings for air-core transformersInfo
- Publication number
- EP0923783A1 EP0923783A1 EP96930208A EP96930208A EP0923783A1 EP 0923783 A1 EP0923783 A1 EP 0923783A1 EP 96930208 A EP96930208 A EP 96930208A EP 96930208 A EP96930208 A EP 96930208A EP 0923783 A1 EP0923783 A1 EP 0923783A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- turns
- coil
- voltage
- layers
- winding
- 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
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
- H01F27/327—Encapsulating or impregnating
Definitions
- the present invention relates to dry electrical transformers for the distribution of electrical energy. More specifically, the invention relates to the production of "Medium Voltage” windings, called M.T. (or High Voltage) which are provided with such devices.
- M.T. or High Voltage
- the "Medium or High Voltage" windings constituting the primary of distribution transformers ie those intended to be subjected to input voltages of 20,000 volts and above per phase, are conventionally constituted by a wired metallic conductor with dielectric sheathing (generally an enamel film) wound in turns in series.
- the other is to wind the turns into juxtaposed spiral flat wafers, each extending radially.
- This technique described in particular in European patent n ° 0081446 in the name of the applicant, consists in synchronizing the speed of feed of the wire into a filling receptacle under the effect of its weight alone with the speed of rotation on itself of this receptacle. The wire is then deposited there in a "back and forth" movement perpendicular to the axis of the coil in formation, the completion of the movement in one direction resulting in the production of a layer.
- the purpose of the present invention is to provide a solution to the problem mentioned above.
- the subject of the invention is an elementary electrical coil of generally annular shape, intended to form the "Medium (or high) voltage winding of a dry electrical transformer, coil constituted by a wired metallic conductor with dielectric sheathing and wound in air in a plurality of turns in series arranged in juxtaposed longitudinal or radial layers, then encapsulated in a mass of electrically insulating plastic material from which emerge the input / output terminations of the coil, coil characterized in that , for any given electrical voltage to be applied between said terminations, the number of layers of turns is such that the voltage between two neighboring turns that are most electrically distant on two adjacent layers does not exceed the value that would be provided by Paschen's law applied in air to said sheathed conductor.
- the invention is based on the fact of having discovered that Paschen's law was applicable in the present case and could constitute the basis for a concrete response to the problem posed.
- the invention applies this law to the case of a conductor wound in air, but coated with a dielectric sheath, which results in the establishment of the abacuses of FIG. 2 giving the disruptive voltage between neighboring turns as a function of the thickness of the dielectric sheath, these charts being parameterized on the air pressure in the spaces between turns of the coil.
- the invention rather than seeking to fill these vacant inter-turn spaces with injected dielectric material, defines winding conditions allowing the air naturally present in these dead spaces to play effectively the role of dielectric in electrical windings which nevertheless constitute transformers capable of being placed at voltages of several tens of thousands of volts per phase. Consequently, there is no longer any risk in being limited to a simple encapsulation with insulating plastic material.
- the set of turns has in cross section a generally square or rectangular shape that is not very elongated.
- the invention has the advantage in particular of being able to build the primary windings of dry transformers according to variable sizes by stacking standard elementary coils, the number of which to be joined in series will depend on the level of electrical voltage to be applied across the terminals of the primary .
- a need does indeed exist today in the electrotechnical industry, as in all the manufacturing industries, of modular realization allowing more flexibility in the management of stocks, supplies and less manufacturing time.
- FIG. 2 gives the charts of the disruptive voltage between two turns in contact with the air as a function of the thickness of the dielectric sheath enveloping the metal wire from which the turns are formed and as a function of the pressure.
- FIG. 3a is a diagram showing a winding of turns wound in longitudinal layers.
- FIG. 4 shows, according to five successive views going from view 4a to 4e, the steps for producing an elementary coil according to the invention and the "Medium Voltage" winding which results therefrom, intended to equip a dry transformer polyphase.
- the curve of FIG. 1 clearly shows that, for a given ambient medium, here air, the disruptive voltage Ud is solely a function of the product d * p between the distance d separating two bodies placed under different electrical voltages and the pressure p air reigning between them.
- the value of the maximum tension that can be applied to the ends of such a winding can be adjusted, by choosing the number of layers of turns. component. It is then possible to produce windings adapted to any high electrical voltage as desired by simple stacking of standard elementary windings constructed according to these provisions. We will take care to consider these provisions "cold", that is to say at room temperature, in order to put us in a situation where the pressure in the spaces between turns can only increase when the electric current comes to be established in the winding.
- the pressure indicated here is an absolute pressure, the inter-turn space generally being under vacuum during the cooling phases, and the rest during the subsequent restarts of the transformer, until reaching its operating temperature.
- the voltage Td is an effective voltage, while the voltage Ud in FIG. 1 is given in peak values.
- FIGS. 3a and 3b show schematically the two winding modes, in longitudinal and radial layers respectively, and are given only by way of illustration in order to facilitate setting of the invention.
- the same references designate identical elements.
- Each of the two figures represents a cylindrical coil of revolution of axis X seen slightly from above and truncated by an axial section so as to see in cross section the organization of the turns which make up the electrical winding.
- the winding 1 of FIG. 3a is obtained from a flexible commercial wire 2 of circular section, sheathed by a film of dielectric enamel 3 of usual quality.
- This wire is wound around the X axis on a winding support 4 in turns organized in concentric longitudinal layers. After positioning at one end of the support 4 of the first turn 5, the winding of the following turns continues in the direction indicated by the arrow Fv to the other end of the support, along a helical path of very short pitch to the wire diameter.
- the second layer 7 is produced in the same way in the opposite direction, as indicated by the arrow Fv '.
- the winding is thus executed in tight turns in a "back and forth" movement along the X axis, each pass accomplished in a direction carrying out a longitudinal layer alternating with the previous layer.
- a set of concentric juxtaposed longitudinal layers is thus constructed around the axis X.
- the last turn 8 of the winding has in common with the first turn 5 to form by their splices 9, 10, which come out of the winding, the input / output terminations thereof.
- the winding 11 of FIG. 3b is obtained in a similar manner, but by winding the wire in radial flat layers 13 stacked one on the other. These layers, or wafers are formed during the deposition of the electric wire 2 in turns in a movement also of "back and forth", but this time directed perpendicular to the axis X.
- the support plate 12 provided end plates 14 and 15 serving to laterally confine the stack of pancakes 13.
- the wire 2 in this case is not tensioned, but subjected to its own weight only, and the speed of rotation of the plate is at all times adjusted to the speed of feed of the wire so that the removal of the coil takes place at the desired radial position of the wafer being formed.
- the automation allowing the industrial realization of such a winding mode is described, as already indicated, in the European patent n ° 0081446.
- the first wafer 17 begins with the internal coil 16 against the flange 14, then flourish radially in a centrifugal manner as indicated by the arrow Fh up to the level of the outer flange 15.
- the second wafer 18 is formed then on the first in the centripetal direction to the inner flange 14, and so on to the end turn 19 which extends out of the coil by a splice 20, similar to the splice 21 of the first turn 16 for form the winding input / output terminations together.
- the turns even tight necessarily define between them dead volumes 26. Many among them will remain partially, even completely, empty of dielectric material, which could not have been penetrate during its injection due to the compactness of the winding.
- any two contiguous turns should never be provided with a dielectric sheath 3 thinner than that given by the curves of the Figure 2 for a given applied electrical voltage. Otherwise, a partial discharge is possible. Such a requirement is most severe for the two most electrically distant contiguous turns on two adjacent layers (the potential difference then being the greatest), that is to say those placed at the beginning and ending ends of these two adjacent layers respectively. .
- any risk of partial discharge in the inter-turn voids 26 can be avoided if, for any voltage U applied to the winding, the number of layers of turns constituting this winding is determined so that the voltage u between two neighboring turns, but the most electrically distant on two adjacent layers, does not exceed the value Td which would be provided by the application in air of Paschen's law.
- this coil 27 has the shape of a ring of square or slightly rectangular cross section, that is to say of which the length hardly exceeds three times the width.
- This elementary coil 27, constituting a "Medium Voltage” or “High Voltage” winding for dry transformer, is produced as follows: .
- a flexible wire 2 of Cu or Al enameled in turns 30 (200-300 turns for example) is wound to form a ring 28.
- the winding takes place for example according to the type "concentric longitudinal layers described with reference in FIG. 3a, if necessary, the whole is stiffened by impregnating with an adhesive to ensure minimal mechanical support for the ring thus formed.
- the ring 28 is placed in a mold (not shown), into which an insulating dielectric resin 29 is injected which will encapsulate the ring over a thickness of several millimeters after having taken care to allow the ends of the wire to protrude sufficiently to form the terminations 9, 10 which will serve as connections. Once the resin has solidified, the standard elementary coil 27 is finished.
- the number of layers for example fifteen, has been determined so that, the maximum effective voltage between two contiguous electrically distant turns being for example 350 volts, the coil can be used under a voltage of 2500 volts for example.
- the resin used can be a thermosetting or thermoplastic polymer, provided that its electrical insulating properties are very high, since the medium (or high) voltage winding of the transformer will be subjected to voltages which reach conventionally several tens of thousands of volts per phase.
- - Figure 4c Then performs such a winding 31 for transformer by stacking a desired number of these elementary coils 27 on each other so as to achieve the desired height.
- the whole is assembled rigidly by any suitable means, for example by collage.
- the coils are connected electrically in series with one another using small connector sleeves 32 which are permanently engaged on the splices 9, 10 by crimping.
- - Figure 4d It is then necessary to electrically isolate this area of the stack where the connectors are exposed. This is achieved by covering it with a layer of resin applied by hot compression of a sheet of thermoplastic resin.
- the inductors 38 can be composed of standard elementary coils of different characteristics, such as admissible input voltage, or height of the coil. For obvious practical reasons, it will be advantageous for them all to be the same width, except for wishing to have a stepped outer wall for certain inductors.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR1996/001353 WO1998010445A1 (en) | 1996-09-04 | 1996-09-04 | Single coil constitutive of windings for air-core transformers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0923783A1 true EP0923783A1 (en) | 1999-06-23 |
EP0923783B1 EP0923783B1 (en) | 2004-02-25 |
Family
ID=9488836
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96930208A Revoked EP0923783B1 (en) | 1996-09-04 | 1996-09-04 | Single coil constitutive of windings for air-core transformer |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0923783B1 (en) |
JP (1) | JP2000517479A (en) |
AU (1) | AU6933996A (en) |
CA (1) | CA2264703A1 (en) |
DE (1) | DE69631697D1 (en) |
WO (1) | WO1998010445A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2822587B1 (en) * | 2001-03-20 | 2003-05-16 | France Transfo Sa | PRODUCTION OF "HIGH OR MEDIUM VOLTAGE" WINDINGS OF UNDERWATER TRANSFORMERS, AND WINDINGS THUS PRODUCED |
FR2825508B1 (en) * | 2001-06-01 | 2003-09-05 | Degreane Ets | TELECOMMUNICATION TRANSMITTER INCORPORATING AN IMPROVED GALVANIC ISOLATION TRANSFORMER |
DE60227710D1 (en) * | 2002-03-21 | 2008-08-28 | Schneider Electric Ind Sas | MANUFACTURE OF HIGH OR MEDIUM VOLTAGE WINDINGS FOR OIL-FILLED TRANSFORMERS AND WINDINGS MANUFACTURED THEREFOR |
EP2400511A1 (en) | 2010-06-28 | 2011-12-28 | ABB Technology AG | Modular non-circular coil for transformers |
WO2012000984A1 (en) | 2010-06-28 | 2012-01-05 | Abb Technology Ag | Coil for transformers made from coil segments with locking means |
RU2553455C1 (en) * | 2014-01-20 | 2015-06-20 | Открытое акционерное общество "ОКБ-Планета" ОАО "ОКБ-Планета" | Inductance coil |
RU2640405C2 (en) * | 2016-05-05 | 2018-01-09 | Людмила Михайловна Пестряева | Induction device winding and method of its manufacture |
RU2641312C1 (en) * | 2016-09-15 | 2018-01-17 | Людмила Михайловна Пестряева | Multi-layer cylindrical winding |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57121207A (en) * | 1981-01-21 | 1982-07-28 | Hitachi Ltd | Manufacture of plastic molded coil |
FR2517462B1 (en) * | 1981-12-01 | 1986-10-03 | France Transfo Sa | METHOD AND DEVICE FOR WINDING INDUCTIVE WINDINGS EQUIPPED WITH ELECTRICAL APPARATUS SUCH AS TRANSFORMERS |
JP2835239B2 (en) * | 1992-04-07 | 1998-12-14 | 株式会社東芝 | Sheet winding transformer |
-
1996
- 1996-09-04 EP EP96930208A patent/EP0923783B1/en not_active Revoked
- 1996-09-04 AU AU69339/96A patent/AU6933996A/en not_active Abandoned
- 1996-09-04 DE DE69631697T patent/DE69631697D1/en not_active Expired - Lifetime
- 1996-09-04 WO PCT/FR1996/001353 patent/WO1998010445A1/en not_active Application Discontinuation
- 1996-09-04 CA CA002264703A patent/CA2264703A1/en not_active Abandoned
- 1996-09-04 JP JP10512294A patent/JP2000517479A/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9810445A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0923783B1 (en) | 2004-02-25 |
CA2264703A1 (en) | 1998-03-12 |
WO1998010445A1 (en) | 1998-03-12 |
DE69631697D1 (en) | 2004-04-01 |
AU6933996A (en) | 1998-03-26 |
JP2000517479A (en) | 2000-12-26 |
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