WO2003094180A1 - Realisation d'enroulements 'haute ou moyenne tension' de transformateurs immerges, et enroulements ainsi realises - Google Patents
Realisation d'enroulements 'haute ou moyenne tension' de transformateurs immerges, et enroulements ainsi realises Download PDFInfo
- Publication number
- WO2003094180A1 WO2003094180A1 PCT/EP2002/003149 EP0203149W WO03094180A1 WO 2003094180 A1 WO2003094180 A1 WO 2003094180A1 EP 0203149 W EP0203149 W EP 0203149W WO 03094180 A1 WO03094180 A1 WO 03094180A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- turns
- expressed
- winding
- voltage
- wire
- Prior art date
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
- H01F27/323—Insulation between winding turns, between winding layers
-
- 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 the production of so-called "high (or medium) voltage" windings of electrical power or distribution transformers.
- the transformers in question here are those capable of receiving on their primary windings connected to the power supply network high electrical voltages per phase, of the order of several tens of thousands of volts.
- transformers of this type are immersed in a dielectric coolant (generally a mineral oil with pronounced dielectric properties) contained in a sealed tank, the walls of which constitute heat exchange surfaces with the ambient medium to maintain the temperature. of the transformer in operation, around 60 to 80 ° C approximately.
- a dielectric coolant generally a mineral oil with pronounced dielectric properties
- Each primary phase winding is conventionally constituted by a coil of enamelled metal wire, a good conductor of electricity (copper or aluminum). This coil surrounds at a short distance the secondary winding which is matched to it (generally called "Low Voltage” winding) and most often produced by a wide strip of aluminum wound on itself, whose interior central space is sized for receive one of the columns of the magnetic circuit of the transformer, present in number equal to that of the phases of the power supply.
- the cylindrical crown (of revolution or oblong), that forms the wire coil constituting the "primary” winding, is, in turn, formed by sheets of concentric turns of wire wound alternately in one direction then in the other according to all the height of the winding (winding called "in long layers").
- a interlayer is interposed between two consecutive layers to provide the electrical insulation necessary for the good voltage withstand of the winding. This insulation must be provided particularly at the end of the layer, where the terminal turns facing two adjacent plies, being electrically distant from each other by a distance of wire corresponding to two long layers, therefore have a difference between them. of maximum potential.
- This interlayer is to create an electric potential gradient below the spark spark threshold between turns, which the dielectric coating of the wire (its enamel layer on the surface) cannot manage on its own.
- This interlayer is conventionally formed by a strip of paper, single or double layer, of 0.1 to 0.5 mm and more thickness approximately depending on the case, and impregnated with dielectric oil. It also ensures a certain mechanical cohesion of the finished winding.
- each of the primary coils produced as indicated above is in the form of a cylindrical ring about 0.50 m long, with outside diameters of 45 cm and inside diameters of around 30 cm.
- the object of the invention is precisely to reduce the size of power or distribution transformers by reducing the size of their "high voltage” windings, and this, of course for a given installed power, or, which amounts to the same thing, increasing the power of these transformers without having to increase their size.
- H mini (Gd mini * Gp mini * D mini) / 4 * Usp maxi H maxi:;: (Gd maxi * Gp maxi * D maxi) / 4 * Usp mini
- the invention therefore consists in dispensing with the dielectric interlayer, the presence of which, however considered necessary for the reasons of electrical insulation previously mentioned, is nevertheless in itself a complicating factor for the winding operation and additional cost at the same time "material”, “labor” and “tool” for the realization of the windings, and to replace this interlayer by two complementary complementary provisions.
- a first arrangement aims to make the enameled wire sticky to ensure the mechanical strength of the winding by the rigidity and stability of the assembly which result from the bonding effect of the turns between them.
- the second arrangement consists in replacing the usual monolithic "long layer” coil making the entire height of the primary winding, with wafers of wire of round (or almost round) section coil in layers of turns bonded without dielectric interlayer and of which the height is determined by calculation, thanks to a specific formula, valid only in the case of a wire of this shape and integrating the dimensional characteristics of the latter together with constraints related to the dielectric strength of the finished winding in its conditions of use (compliance with Paschen's law) and the interspire voltage which is a classic datum known to the transformer manufacturer and chosen by him according to the electrical power of the winding he wishes to achieve and the number of turns which will constitute it.
- This winding can also be done according to the above-mentioned "long layer” technique, that is to say by tight winding of coils in concentric layers making the entire thickness of the wafer, the wire progressing in the axial direction in this case like the present invention, from the bottom to the top, then from the top to the bottom for the next layer, the mandrel winding serving as support for the first ply on which the next is formed and so on.
- the replacement of the usual single coil, making the entire height of the primary winding, by a stack of wafers mounted in series has the consequence of reducing within each of them, by a factor moreover equal to the number of wafers (assuming they are identical, and for a given voltage applied to the primary), the value of the maximum voltage between turns. Consequently, the presence of a dielectric paper in interlayer is no longer necessary, the usual enamel film which surrounds the metallic conductor is then sufficient to contain the voltage gradient below the arc threshold between two neighboring turns. , even those located at the end of two layers of consecutive turns, if one does not exceed a certain wafer height which depends in particular on the size of the wire and the calculation rule of which is one of the essential characteristics of the present invention .
- the enamel is pre-coated with a material with adhesive properties.
- a material with adhesive properties we will thus use a ready-to-use adhesive enameled wire which is readily available commercially.
- the wire should not be sticky "cold” so as not to interfere with its handling or its winding during the winding of the wafer.
- a thermo-adhesive varnish by hot polymerizations.
- a pre-sizing epoxy resin may be perfectly suitable. The polymerization of such a thermosetting material will take place after passage of the pancake in the oven at 150-200 ° C for a sufficient time to obtain a polymerization at heart (1 to 2 h generally).
- the bonding can be done "cold” after drying of an adhesive.
- the adhesive can be applied "post-winding", ie once the wafer has been wound.
- it can be deposited on the moving wire just before it is put into turns, by spraying with an aerosol, or by immersion of the wire in a container of liquid glue, for example.
- the tension intersperses Usp is a constructive datum well known to those skilled in the art.
- the latter chooses it according to the operating characteristics of the transformer, such as the frequency of the supply current (50 Hz in principle) or the magnetic induction to be passed through the magnetic circuit (conventionally around 1 to 2 Tesla) and geometric characteristics of the High Voltage windings, such as their inside diameter, that is to say the inside diameter of the wafers.
- the tension gradient Gd is determined from a disruptive voltage value given by Paschen's law applied in air to the sheath wire constituting the wafer. It is recalled that Paschen's law establishes that the disruptive voltage between two conductive bodies brought to different electrical potentials in a gaseous medium gives, generally the ambient air, is a continuous function and rapidly increasing product between the distance between these conductors and the pressure of the ambient medium. This disruptive voltage is therefore linked in particular to the thickness of the dielectric enamel layer covering the wire.
- the interlayer once absent, when winding the turns are naturally organized into nested turns, that is to say, if we look at them in cross-section in cross section, according to a topology of the "compact hexagonal structure” type. ", therefore having a minimum size and natural mechanical stability at the scale of several turns in mutual contact in the wafer. It will be observed that these advantages can also be obtained with an oblong wire in section, it being understood that it is the circular shape which must be preferred in this regard.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
- Insulating Of Coils (AREA)
- Transformer Cooling (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT02726197T ATE401656T1 (de) | 2002-03-21 | 2002-03-21 | Herstellung von hoch- oder mittelspannungs wicklungen für ölgefüllte transformatoren und somit hergestellte wicklungen |
PCT/EP2002/003149 WO2003094180A1 (fr) | 2002-03-21 | 2002-03-21 | Realisation d'enroulements 'haute ou moyenne tension' de transformateurs immerges, et enroulements ainsi realises |
DE60227710T DE60227710D1 (de) | 2002-03-21 | 2002-03-21 | Herstellung von hoch- oder mittelspannungs wicklungen für ölgefüllte transformatoren und somit hergestellte wicklungen |
EP02726197A EP1485927B1 (fr) | 2002-03-21 | 2002-03-21 | Realisation d'enroulements "haute ou moyenne tension" de transformateurs immerges, et enroulements ainsi realises |
ES02726197T ES2307747T3 (es) | 2002-03-21 | 2002-03-21 | Produccion de arrollamientos "de alta o media tension" para transformadores sumergidos y arrollamientos asi fabricados. |
AU2002256695A AU2002256695A1 (en) | 2002-03-21 | 2002-03-21 | Production of high or medium voltage windings for oil-immersed transformers and the windings thus produced |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2002/003149 WO2003094180A1 (fr) | 2002-03-21 | 2002-03-21 | Realisation d'enroulements 'haute ou moyenne tension' de transformateurs immerges, et enroulements ainsi realises |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003094180A1 true WO2003094180A1 (fr) | 2003-11-13 |
Family
ID=29286068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/003149 WO2003094180A1 (fr) | 2002-03-21 | 2002-03-21 | Realisation d'enroulements 'haute ou moyenne tension' de transformateurs immerges, et enroulements ainsi realises |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1485927B1 (fr) |
AT (1) | ATE401656T1 (fr) |
AU (1) | AU2002256695A1 (fr) |
DE (1) | DE60227710D1 (fr) |
ES (1) | ES2307747T3 (fr) |
WO (1) | WO2003094180A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103474230A (zh) * | 2013-09-06 | 2013-12-25 | 合肥鑫伟电力设备有限公司 | 分段圆筒式线圈绕制工艺 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4496926A (en) * | 1981-01-21 | 1985-01-29 | Hitachi, Ltd. | Molded coil structure |
FR2637729A1 (fr) * | 1988-10-07 | 1990-04-13 | Transfix Soc Nouv | Transformateur de distribution haute tension/basse tension a isolement sec et procede pour realiser un tel transformateur |
WO1998010445A1 (fr) * | 1996-09-04 | 1998-03-12 | Schneider Electric S.A. | Bobine electrique elementaire constitutive d'enroulements pour transformateurs secs |
-
2002
- 2002-03-21 AT AT02726197T patent/ATE401656T1/de not_active IP Right Cessation
- 2002-03-21 WO PCT/EP2002/003149 patent/WO2003094180A1/fr active IP Right Grant
- 2002-03-21 EP EP02726197A patent/EP1485927B1/fr not_active Expired - Lifetime
- 2002-03-21 DE DE60227710T patent/DE60227710D1/de not_active Expired - Lifetime
- 2002-03-21 ES ES02726197T patent/ES2307747T3/es not_active Expired - Lifetime
- 2002-03-21 AU AU2002256695A patent/AU2002256695A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4496926A (en) * | 1981-01-21 | 1985-01-29 | Hitachi, Ltd. | Molded coil structure |
FR2637729A1 (fr) * | 1988-10-07 | 1990-04-13 | Transfix Soc Nouv | Transformateur de distribution haute tension/basse tension a isolement sec et procede pour realiser un tel transformateur |
WO1998010445A1 (fr) * | 1996-09-04 | 1998-03-12 | Schneider Electric S.A. | Bobine electrique elementaire constitutive d'enroulements pour transformateurs secs |
Also Published As
Publication number | Publication date |
---|---|
ES2307747T3 (es) | 2008-12-01 |
DE60227710D1 (de) | 2008-08-28 |
AU2002256695A1 (en) | 2003-11-17 |
EP1485927A1 (fr) | 2004-12-15 |
EP1485927B1 (fr) | 2008-07-16 |
ATE401656T1 (de) | 2008-08-15 |
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