EP2745299B1 - Method of assembling electric transformer - Google Patents
Method of assembling electric transformer Download PDFInfo
- Publication number
- EP2745299B1 EP2745299B1 EP11872901.1A EP11872901A EP2745299B1 EP 2745299 B1 EP2745299 B1 EP 2745299B1 EP 11872901 A EP11872901 A EP 11872901A EP 2745299 B1 EP2745299 B1 EP 2745299B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- press
- drying
- mechanical
- pressure
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 25
- 238000001035 drying Methods 0.000 claims description 43
- 239000003350 kerosene Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
Definitions
- the invention relates to a method of assembling an electric transformer. More particularly, the invention relates to a method where coils of the transformer are compressed during the assembly.
- Electric transformers usually comprise at least two coils, namely at least one primary coil for inputting electrical energy and at least one secondary coil for outputting electrical energy.
- the relation between the number of windings of the primary coil and the number of windings of the secondary coil determines the electric characteristics of the transformer.
- transformers may be immersed in transformer oil that both cools and insulates the windings of the coils.
- transformer oil that both cools and insulates the windings of the coils.
- such oil-filled transformers undergo prolonged drying processes to ensure that the transformer is completely free of water vapor before the cooling oil is introduced.
- a method for drying the active part of a transformer is described in German Patent Application DE 195 01 323 A1 .
- the transformer is coupled to a vacuum pump, and the windings are supplied with a low frequency heating current that causes the solid insulation within the transformer to have gas or water content removed.
- Document KR100699542B discloses a method of forming a transformer wherein coils and core are assembled together and then put in a drying oven.
- the coils are usually compressed in order to avoid that the coils might change their size and position under the exposure of high electrical currents.
- An embodiment of the invention relates to a method of assembling an electric transformer, comprising the steps of:
- An advantage of this embodiment is that both drying and compressing may be carried out simultaneously. Therefore the assembling may be carried out very time efficient and cost-saving.
- the exposure of the dried and compressed coil to the ambient atmosphere may be substantially shortened compared to prior art assembly.
- the electromagnetic component may immediately be inserted into a transformer vessel which may be filled with oil or evacuated after the insertion of the electromagnetic component. There is no need to compress the coils outside the oven under ambient atmosphere because the coils have already been compressed during the drying and are ready for final assembly in the transformer vessel.
- the step of combining the electric coil and the transformer core to form the electromagnetic component may comprise the step of mounting the coil on the transformer core or the step of mounting the transformer core on the coil.
- the coil may slightly change its size. This effect may be addressed by using a tunable press.
- the tunable press allows generating a defined mechanical pressure over time even if the coil changes its size over time during the drying process.
- a hydraulic press is used to apply the mechanical pressure.
- the hydraulic press may comprise a pressure cylinder and a control unit that controls the pressure applied to the coil whilst the coil is dried.
- the press is controlled to apply a constant mechanical pressure over time during the step of drying the coil.
- the press is controlled to modify the mechanical pressure over time during the step of drying the coil.
- a predefined pressure profile may be applied during the drying step.
- the predefined pressure profile may address an anticipated change of size of the coil during the drying step.
- the pressure that is applied by the press is preferably monitored. This allows controlling the press to maintain the pressure on a predefined level or to provide a given pressure profile over time.
- the size of the coil may be measured whilst the mechanical pressure is applied by the press and the coil is dried. This allows adapting the pressure on the coil to achieve a predefined coil size after completing the drying step.
- the step of drying the electromagnetic component may be - at least temporarily - carried out in a kerosene containing gas or in vacuum.
- at least those parts of the press, which are in contact with the coil, are preferably kerosene-resistant and/or vacuum-resistant.
- the mechanical elements for ensuring that the mechanical pressure previously provided by the press is steadily maintained may comprise pull rods and/or wedges.
- the step of forming the electromagnetic component preferably includes providing a closed magnetic circuit in the electromagnetic component before the drying in the drying oven is started.
- Figure 1 shows in an exemplary fashion an E-shaped transformer core 10.
- the shape of the transformer core may vary in a wide range .
- the shape shown in Figure 1 has been chosen for illustrating purposes, only, and may be replaced by any other core shape.
- the core shape might be chosen differently to accommodate the required number of coils.
- a coil 20 is mounted such that the middle section 11 of the transformer core penetrates the coil 20 (see Figure 2 ).
- the coil 20 may comprise primary and secondary windings which are not shown in further detail.
- the E-shaped transformer core 10 is provided with an I-shaped core element 30 which is placed on top of the E-shaped transformer core 10 (see Figure 3 ) . If electric current flows through the windings of coil 20, a magnetic flux will be generated as schematically indicated by reference sign 40.
- the original size of the coil 20 before the compressing is indicated by reference sign H.
- the resulting electromagnetic component 50 which comprises the E-shaped transformer core 10, the I-shaped transformer element 30, and the coil 20, is then subjected to a drying step.
- the drying step is preferably combined with a step of compressing the coil 20 such that both steps are carried out simultaneously.
- a tunable press 60 is attached to the coil 20.
- the press 60 is preferably a hydraulic press which comprises a pressure cylinder 61 and a control unit 62.
- the control unit 62 controls the pressure applied by the pressure cylinder 61 and therefore regulates the extent to which the coil 20 is compressed.
- the size of the compressed coil 20 is designated by reference sign h (h ⁇ H) in Figure 4 .
- the electromagnetic component 50 is moved into a drying oven 70 as shown in Figure 5 .
- the entire press 60 may be moved into the drying oven 70 as shown in Figure 5 .
- the sequence of the above discussed steps of attaching the hydraulic press 60 and moving the electromagnetic component 50 into the drying oven 70 may be opposite.
- the electromagnetic component 50 may be moved into the drying oven 70 before the hydraulic press 60 in its entirety or parts thereof (for instance the pressure rods 63 and/or the pressure cylinder 61), are mounted on the coil 20.
- mechanical elements 80 are attached to the coil 20. These mechanical elements 80 prevent the coil 20 from increasing its size if and when the hydraulic press 20 is detached from the coil 20. In other words, the mechanical elements 80 ensure that the mechanical pressure previously provided by the hydraulic press 60 is maintained without interruption.
- the mechanical elements 80 is attached in the drying oven 70.
- Figures6 and 7 illustrate the removal of the 60 or its parts outside the drying oven 70.
- the assembled transformer is designated by reference numeral 100.
- FIGS 10 and 11 illustrate the removal of the press 60 or its parts inside the drying oven 70.
- the mechanical elements 80 are attached to the electromagnetic component 50 before the press is detached.
Description
- The invention relates to a method of assembling an electric transformer. More particularly, the invention relates to a method where coils of the transformer are compressed during the assembly.
- Electric transformers usually comprise at least two coils, namely at least one primary coil for inputting electrical energy and at least one secondary coil for outputting electrical energy. The relation between the number of windings of the primary coil and the number of windings of the secondary coil determines the electric characteristics of the transformer.
- In high power applications, transformers may be immersed in transformer oil that both cools and insulates the windings of the coils. In order to prevent electrical breakdown under load, such oil-filled transformers undergo prolonged drying processes to ensure that the transformer is completely free of water vapor before the cooling oil is introduced.
- A method for drying the active part of a transformer is described in German Patent Application
DE 195 01 323 A1 . The transformer is coupled to a vacuum pump, and the windings are supplied with a low frequency heating current that causes the solid insulation within the transformer to have gas or water content removed. - Document
KR100699542B - Document
US 3 557 846 discloses an apparatus and method of compressing a winding during a drying process. - During the assembly of high power transformers, the coils are usually compressed in order to avoid that the coils might change their size and position under the exposure of high electrical currents.
- It is an objective of the invention to provide a method of assembling electric transformers, which is more efficient than prior art methods.
- An embodiment of the invention relates to a method of assembling an electric transformer, comprising the steps of:
- combining an electric coil and a transformer core to form an electromagnetic component;
- providing the coil with a press;
- drying the electromagnetic component in a drying oven while the press simultaneously applies mechanical pressure to the coil;
- during or after completing the drying step, providing the coil with at least one mechanical element adapted to prevent the coil from increasing its size; and
- removing the press from the coil after said at least one mechanical element ensures that the mechanical pressure previously provided by the press, is steadily maintained
- An advantage of this embodiment is that both drying and compressing may be carried out simultaneously. Therefore the assembling may be carried out very time efficient and cost-saving.
- Furthermore, the exposure of the dried and compressed coil to the ambient atmosphere may be substantially shortened compared to prior art assembly. After removing the electromagnetic component from the drying oven, the electromagnetic component may immediately be inserted into a transformer vessel which may be filled with oil or evacuated after the insertion of the electromagnetic component. There is no need to compress the coils outside the oven under ambient atmosphere because the coils have already been compressed during the drying and are ready for final assembly in the transformer vessel.
- The step of combining the electric coil and the transformer core to form the electromagnetic component may comprise the step of mounting the coil on the transformer core or the step of mounting the transformer core on the coil.
- During the drying step the coil may slightly change its size. This effect may be addressed by using a tunable press. The tunable press allows generating a defined mechanical pressure over time even if the coil changes its size over time during the drying process.
- Preferably, a hydraulic press is used to apply the mechanical pressure. The hydraulic press may comprise a pressure cylinder and a control unit that controls the pressure applied to the coil whilst the coil is dried.
- According to a preferred embodiment, the press is controlled to apply a constant mechanical pressure over time during the step of drying the coil.
- According to another preferred embodiment, the press is controlled to modify the mechanical pressure over time during the step of drying the coil. For instance, a predefined pressure profile may be applied during the drying step. The predefined pressure profile may address an anticipated change of size of the coil during the drying step.
- The pressure that is applied by the press is preferably monitored. This allows controlling the press to maintain the pressure on a predefined level or to provide a given pressure profile over time.
- Moreover, the size of the coil may be measured whilst the mechanical pressure is applied by the press and the coil is dried. This allows adapting the pressure on the coil to achieve a predefined coil size after completing the drying step.
- The step of drying the electromagnetic component may be - at least temporarily - carried out in a kerosene containing gas or in vacuum. In this case, at least those parts of the press, which are in contact with the coil, are preferably kerosene-resistant and/or vacuum-resistant.
- The mechanical elements for ensuring that the mechanical pressure previously provided by the press is steadily maintained may comprise pull rods and/or wedges.
- The step of forming the electromagnetic component preferably includes providing a closed magnetic circuit in the electromagnetic component before the drying in the drying oven is started.
- In order that the manner in which the above-recited and other advantages of the invention are obtained will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are therefore not to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail by the use of the accompanying drawings in which
-
Figures 1-7 show a first exemplary embodiment of a method according to the present invention; -
Figure 8 illustrates a first modification of the method as shown inFigures 1-7 in an exemplary fashion; -
Figure 9 illustrates a second modification of the method as shown inFigures 1-7 in an exemplary fashion; and -
Figures 10-11 illustrate a third modification of the method as shown inFigures 1-7 in an exemplary fashion. - The preferred embodiment of the present invention will be best understood by reference to the drawings, wherein identical or comparable parts are designated by the same reference signs throughout.
- It will be readily understood that the present invention, as generally described and illustrated in the figures herein, could vary in a wide range. Thus, the following more detailed description of the exemplary embodiments of the present invention, as represented in
Figures 1-11 , is not intended to limit the scope of the invention, as claimed, but is merely representative of presently preferred embodiments of the invention. -
Figure 1 shows in an exemplary fashion anE-shaped transformer core 10. The shape of the transformer core may vary in a wide range . As such, the shape shown inFigure 1 has been chosen for illustrating purposes, only, and may be replaced by any other core shape. For instance, in case of a multiple phase transformer the core shape might be chosen differently to accommodate the required number of coils. - In the following, the assembling of the transformer will be explained and illustrated with reference to a single coil which represents all coils of the respective transformer.
- On the
middle section 11 of thetransformer core 10, acoil 20 is mounted such that themiddle section 11 of the transformer core penetrates the coil 20 (seeFigure 2 ). Thecoil 20 may comprise primary and secondary windings which are not shown in further detail. - In order to provide a closed magnetic circuit, the
E-shaped transformer core 10 is provided with an I-shaped core element 30 which is placed on top of the E-shaped transformer core 10 (seeFigure 3 ) . If electric current flows through the windings ofcoil 20, a magnetic flux will be generated as schematically indicated byreference sign 40. - The original size of the
coil 20 before the compressing is indicated by reference sign H. - The resulting
electromagnetic component 50 which comprises theE-shaped transformer core 10, the I-shapedtransformer element 30, and thecoil 20, is then subjected to a drying step. The drying step is preferably combined with a step of compressing thecoil 20 such that both steps are carried out simultaneously. - To this end, a
tunable press 60 is attached to thecoil 20. Thepress 60 is preferably a hydraulic press which comprises apressure cylinder 61 and acontrol unit 62. Thecontrol unit 62 controls the pressure applied by thepressure cylinder 61 and therefore regulates the extent to which thecoil 20 is compressed. The size of the compressedcoil 20 is designated by reference sign h (h < H) inFigure 4 . - Then, the
electromagnetic component 50 is moved into a dryingoven 70 as shown inFigure 5 . In order to allow thehydraulic press 60 to compress thecoil 20, theentire press 60 may be moved into the dryingoven 70 as shown inFigure 5 . - Alternatively, only those parts of the
press 60 may be moved into the dryingoven 70 which have direct physical contact with thecoil 20.Figure 8 and9 show alternative embodiments. - In
Figure 8 , thepressure cylinder 61 andpressure rods 63 are placed inside the dryingoven 70 whereas thecontrol unit 62 is placed outside. - In
Figure 9 , thepressure rods 63 are placed inside the drying oven, only, whereas thepressure cylinder 61 and thecontrol unit 62 are placed outside. - It is apparent, that the sequence of the above discussed steps of attaching the
hydraulic press 60 and moving theelectromagnetic component 50 into the dryingoven 70 may be opposite. For instance, theelectromagnetic component 50 may be moved into the dryingoven 70 before thehydraulic press 60 in its entirety or parts thereof (for instance thepressure rods 63 and/or the pressure cylinder 61), are mounted on thecoil 20. During or after completing the drying step,mechanical elements 80 are attached to thecoil 20. Thesemechanical elements 80 prevent thecoil 20 from increasing its size if and when thehydraulic press 20 is detached from thecoil 20. In other words, themechanical elements 80 ensure that the mechanical pressure previously provided by thehydraulic press 60 is maintained without interruption. - The
mechanical elements 80 is attached in the dryingoven 70.Figures6 and7 illustrate the removal of the 60 or its parts outside the dryingoven 70. The assembled transformer is designated byreference numeral 100. -
Figures 10 and11 illustrate the removal of thepress 60 or its parts inside the dryingoven 70. In this case themechanical elements 80 are attached to theelectromagnetic component 50 before the press is detached.
Claims (12)
- Method of assembling an electric transformer (100), comprising the steps of:- combining an electric coil (20) and a transformer core (10) to form an electromagnetic component (50);- providing the coil (20) with a press (60);- drying the electromagnetic component (50) in a drying oven (70) while the press (60) simultaneously applies mechanical pressure to the coil (20);- during or after completing the drying step, providing the coil (20) with at least one mechanical element (80) adapted to prevent the coil (20) from increasing its size; and- removing the press (60) from the coil (20) after said at least one mechanical element (80) ensures that the mechanical pressure previously provided by the press (60), is steadily maintained,wherein said at least one mechanical element (80) is installed in the drying oven (70).
- Method according to claim 1, wherein said at least one mechanical element (80) is attached to the electromagnetic component (50) before the press is detached.
- Method according to any of the preceding claims, wherein said at least one mechanical element (80) is installed between the electric coil (20) and the transformer core (10).
- Method according to any of the preceding claims, wherein- a tunable press (60) is used and- the tunable press (60) is tuned to generate a defined mechanical pressure over time.
- Method according to any of the preceding claims,- wherein a hydraulic press (60) is used to apply said mechanical pressure, said hydraulic press (60) comprising a pressure cylinder (61) and a control unit (62), and- wherein said control unit (62) controls the pressure applied to said coil (20) whilst the coil (20) is dried.
- Method according to any of the preceding claims, wherein the press (60) is controlled to apply a constant mechanical pressure over time during the step of drying the coil (20).
- Method according to any of the preceding claims, wherein the press (60) is controlled to modify the mechanical pressure over time during the step of drying the coil (20).
- Method according to any of the preceding claims, wherein the pressure applied by the press (60) is monitored and the press (60) is controlled to maintain the pressure on a predefined level.
- Method according to any of the preceding claims, wherein the size of the coil (20) is measured whilst the mechanical pressure is applied by the press (60) and the coil (20) is dried.
- Method according to any of the preceding claims,- wherein said step of drying the electromagnetic component (50) is at least temporarily carried out in a kerosene containing gas, and- wherein at least those parts of the press (60), which are in contact with the coil (20), are kerosene-resistant.
- Method according to any of the preceding claims, wherein at least one pull rod and/or at least one wedge is installed as mechanical element (80) to maintain the mechanical pressure previously provided by the press (60).
- Method according to any of the preceding claims, wherein said step of forming the electromagnetic component (50) includes providing a closed magnetic circuit (40) in the electromagnetic component (50) before the drying in the drying oven (70) is started.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2011/080473 WO2013044510A1 (en) | 2011-09-30 | 2011-09-30 | Method of assembling electric transformer |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2745299A1 EP2745299A1 (en) | 2014-06-25 |
EP2745299A4 EP2745299A4 (en) | 2015-06-24 |
EP2745299B1 true EP2745299B1 (en) | 2018-12-26 |
Family
ID=47994174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11872901.1A Active EP2745299B1 (en) | 2011-09-30 | 2011-09-30 | Method of assembling electric transformer |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2745299B1 (en) |
KR (1) | KR20140054361A (en) |
CN (1) | CN103843085B (en) |
BR (1) | BR112014007475B8 (en) |
WO (1) | WO2013044510A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102488130B1 (en) * | 2021-08-19 | 2023-01-12 | (주)티에스이 | Assembling Automation System of Reactor and manufacturing method using the same |
CN114823120A (en) * | 2022-03-28 | 2022-07-29 | 保定天威保变电气股份有限公司 | Assembling method for under-pressure iron insertion of transformer |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100699542B1 (en) * | 2006-07-31 | 2007-03-23 | 신성공업주식회사 | Device for manufacturing of transformer |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3557846A (en) * | 1968-11-07 | 1971-01-26 | Checheljuk Yakov Z | Apparatus for axial compression of windings |
CH532307A (en) * | 1971-05-19 | 1972-12-31 | Bbc Brown Boveri & Cie | Method and device for the production of active parts for transformers or chokes with electrical windings with strip-shaped insulating material, as well as its application to high and extra high voltage transformers or choke coils |
DE2128991A1 (en) * | 1971-06-11 | 1973-01-04 | Schorch Gmbh | PRESSING DEVICE FOR TRANSFORMER WINDINGS ODGL |
CN1516206A (en) * | 2003-08-25 | 2004-07-28 | 广州特种变压器厂有限公司 | Resin-poured insulation dry transformer and its production method |
CN1750191A (en) * | 2004-09-15 | 2006-03-22 | 特变电工股份有限公司 | Compressing method for transformer body |
CN101325120A (en) * | 2007-06-15 | 2008-12-17 | 台达电子工业股份有限公司 | Transformer and method for winding coil thereof |
CN101145441A (en) * | 2007-07-27 | 2008-03-19 | 中电电气集团有限公司 | Amorphous alloy transformer assembly method |
CN102007554B (en) * | 2009-02-25 | 2012-11-07 | 松下电器产业株式会社 | Transformer and transformer assembly method |
EP2530686B1 (en) * | 2011-06-01 | 2014-08-06 | ABB Research Ltd. | Pressing of transformer windings during active part drying |
-
2011
- 2011-09-30 EP EP11872901.1A patent/EP2745299B1/en active Active
- 2011-09-30 KR KR1020147007904A patent/KR20140054361A/en active Search and Examination
- 2011-09-30 CN CN201180073730.9A patent/CN103843085B/en active Active
- 2011-09-30 WO PCT/CN2011/080473 patent/WO2013044510A1/en active Application Filing
- 2011-09-30 BR BR112014007475A patent/BR112014007475B8/en active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100699542B1 (en) * | 2006-07-31 | 2007-03-23 | 신성공업주식회사 | Device for manufacturing of transformer |
Also Published As
Publication number | Publication date |
---|---|
WO2013044510A1 (en) | 2013-04-04 |
CN103843085B (en) | 2016-06-08 |
CN103843085A (en) | 2014-06-04 |
KR20140054361A (en) | 2014-05-08 |
EP2745299A4 (en) | 2015-06-24 |
BR112014007475A2 (en) | 2017-04-04 |
BR112014007475B8 (en) | 2023-04-25 |
BR112014007475B1 (en) | 2020-04-28 |
EP2745299A1 (en) | 2014-06-25 |
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