EP2851912A1 - Static electric induction system - Google Patents
Static electric induction system Download PDFInfo
- Publication number
- EP2851912A1 EP2851912A1 EP13185589.2A EP13185589A EP2851912A1 EP 2851912 A1 EP2851912 A1 EP 2851912A1 EP 13185589 A EP13185589 A EP 13185589A EP 2851912 A1 EP2851912 A1 EP 2851912A1
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- EP
- European Patent Office
- Prior art keywords
- fluid
- sector
- induction system
- electric induction
- static electric
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- 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.)
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- 230000006698 induction Effects 0.000 title claims abstract description 60
- 230000003068 static effect Effects 0.000 title claims abstract description 60
- 239000012530 fluid Substances 0.000 claims abstract description 218
- 125000006850 spacer group Chemical group 0.000 claims abstract description 40
- 239000012809 cooling fluid Substances 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 description 15
- 238000002076 thermal analysis method Methods 0.000 description 11
- 238000004804 winding Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- UQMRAFJOBWOFNS-UHFFFAOYSA-N butyl 2-(2,4-dichlorophenoxy)acetate Chemical compound CCCCOC(=O)COC1=CC=C(Cl)C=C1Cl UQMRAFJOBWOFNS-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
Classifications
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- 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
- H01F27/322—Insulating of coils, windings, or parts thereof the insulation forming channels for circulation of the fluid
-
- 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
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
-
- 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
- H01F27/2876—Cooling
-
- 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
Abstract
Description
- The invention relates to a static electric induction system, such as a transformer system, which is normally cooled by a fluid.
- Known static electric inductions systems, such as core-type transformers, consist of a tank that contains an active part consisting of a core with a number of current-carrying windings wound around them. The electrical windings or coils are arranged in between electrically insulating cylinders. The electrical windings may be embedded or shaped as discs, which are arranged on top of one another. The electric windings may also be helically shaped. When the transformer is in use the discs generate heat, which needs to be dissipated by a cooling fluid, such as for example oil or ester based liquids. The heat decreases life expectancy of the transformer system and it is therefore generally required to cool transformer systems by using an efficient and robust cooling system. The discs are usually spaced apart in the vertical direction by spacers to form horizontal fluid ducts for the cooling liquid in between two discs or in between two turns of the helical winding. Vertical fluid ducts are usually formed in between the outer cylinder and the stacked discs and in between the inner cylinder and the stacked discs. In most cases the vertical fluid ducts are limited or defined in a horizontal or circumferential direction by spacer ribs, which are used to hold the insulating cylinders in position.
- The cooling system of known transformers may comprise a plurality of fluid guides or flow control members that force the liquid to flow in certain directions, in order to enhance the efficiency of the transformer cooling system. The fluid guides are normally arranged in between two neighbouring spacer ribs next to the inner and/or the outer cylinder so that the fluid, which is flowing upwards in the vertical fluid ducts is forced to flow into the horizontal fluid ducts located below the fluid guides in a zigzag flow pattern. In general the fluid guides are arranged in a symmetrical pattern along the circumference of the housing next to an inside periphery and next to an outside periphery of the stacked discs. Symmetrical means that the fluid guides are arranged in a repeating or periodical pattern on the inside periphery and on the outside periphery of the stacked discs, with minor deviations related to manufacturing considerations.
- US 4'245'206 A discloses a transformer comprising an outer insulation cylinder and an inner insulation cylinder with coil units arranged in between the outer and inner cylinders. Horizontal and vertical spacer members are used to position the coil units between the outer and inner cylinder and to arrange the coil units distant from one another to form horizontal and vertical passages for the cooling liquid. Flow control members are arranged in between the vertical spacer members in order to guide and control the fluid flow by reducing the cross sections of the vertical ducts. The flow control members are arranged circumferentially and vertically symmetrical and periodically with a constant pitch over the entire height of the transformer. The flow control members arranged in a sectional area are always arranged symmetrical and in some cases shifted in a vertical direction, as illustrated in figure 17 of US 4'245'206 A. Due to the symmetrical arrangement of flow control members, hot spots can occur, especially in a circumferential direction of the
coil units 16, and the peak temperature region cannot be effectively cooled. - Due to the generation of losses in the windings a hotspot occurs which affects the aging rate of the insulation and thereby the lifetime of the transformer.
- The actual position and magnitude of the hotspot temperature depends on the actual distribution of the oil flow guides. An important design goal is to keep the maximal hotspot temperature as low as possible.
- Therefore, the distribution or arrangement of flow guides in the transformer thus requires careful consideration and a proper analysis.
- In view of the above it is an object of the present invention to provide an improved static electric induction system, which is robust, efficient and durable. The static electric induction system may be a power transformer or a reactor.
- Another object of the present invention is to provide a static electric induction system that works continuous and steady even under high load.
- Disclosed herein is a static electric induction system comprising cooling fluid, an outer shell and an inner shell, a coil assembly comprising a plurality of coil units, stacked on top of one another and positioned in between the outer and inner shells, and a plurality of coil unit spacers configured to form a plurality of intermediate fluid ducts in between the coil units. The static electric induction system further comprises a first and an adjacent second sector, each of the first and second sector comprising a fluid guide arrangement having a plurality of fluid guides, whereby the vertical distance, as counted in coil units, between one pair of two subsequent fluid guides of a sector differs from a vertical distance, as counted in coil units, between another pair of two subsequent fluid guides of the same sector and whereby the first fluid guide arrangement of the first sector differs from the second fluid guide arrangement of the second sector.
- The fluid guide arrangement of the first sector may differ from the fluid guide arrangement of the second sector not only in that it is vertically shifted.
- The static electrical induction system further may comprise a plurality of vertical inner and outer coil unit spacer ribs uniformly arranged around an inner periphery and around an outer periphery of the coil assembly, whereby respective two neighbouring vertical inner coil unit spacer ribs and two corresponding neighbouring vertical outer coil unit spacer ribs confine a first sector of the coil unit assembly.
- The outer shell and the inner shell may form part of a housing that is configured to receive the coil assembly comprising the coil units and other potential electrical components.
- The build up of the first and second fluid guide arrangements of the above described static electric induction system ensures that the magnitude of hot spots is reduced through heat transfer in the coil units and in the cooling fluid or conduction in the circumferential direction of the coil units.
- In case an unexpected hot spot occurs, the static electric induction system according to the invention is capable to even out hot spots especially in the circumferential direction of the coil units around which hot spots normally spread, even unexpected hot spots. Even in case a hot spot occurs during unusual loading conditions or overloading, it is possible to even out or dissipate the heat energy from that hot spot by using a configuration as described above.
- When a thermal analysis of the static electric induction system is conducted, hot spots and regions with increased temperatures become visible. Computational fluid dynamics (CFD) or thermohydrodynamic network modelling methods may be used to conduct the thermal analysis. Direct temperature measuring methods using fibre optic sensors may also be used to analyse temperature distribution in the static electric induction system. According to such a thermal analysis the fluid guides may be distributed within the static electrical induction system.
- Advantageously the first and second fluid guide arrangements comprise inner fluid guides arranged next to the inner shell and outer fluid guides arranged next to the outer shell.
- The fluid guides may ensure that the cooling fluid flow is changed from a vertical flow direction to a horizontal flow direction and back so that cooling fluid may enter the intermediate ducts.
- The vertical distance, as counted in coil units, between one pair of two subsequent inner or outer fluid guides of a sector may differ from a vertical distance, as counted in coil units, between another pair of two subsequent inner or outer fluid guides of the same sector.
- Thus the vertical distance between two subsequent outer fluid guides may vary and the vertical distance between two subsequent inner fluid guides may vary as seen over the height of the coil assembly.
- This measure increases the efficiency of the cooling of hot spots.
- In a preferred embodiment the inner and outer fluid guides are arranged in a non-periodical manner across at least two sectors.
- The inner fluid guides are basically arranged on a surface defined by the inner periphery of the coil units or the coil assembly and the outer fluid guides are arranged on a surface defined by the outer periphery of the coil units or coil assembly. These surfaces are divided into sectors and when at least two sectors are analysed next to one another, the fluid guides are not periodically distributed.
- It is even possible to have the inner and outer fluid guides not periodically distributed over three or more sectors. Thus it is theoretically possible to have the fluid guides distributed in a very random fashion over the entire inner and outer periphery of the coil assembly of the static electric induction system.
- Preferably the static electric induction system comprises inner vertical fluid ducts and outer vertical fluid ducts.
- The vertical fluid ducts are configured to provide a vertical passage for the cooling fluid.
- In an embodiment the inner and outer fluid guides are configured to more or less completely block a vertical cooling fluid flow in the inner and outer vertical fluid ducts, respectively.
- Such a blockage ensures that a comparatively large amount of cooling fluid is directed into the intermediate fluid ducts so that the coil units are cooled effectively along their horizontal surfaces.
- Advantageously, the first fluid guide arrangement of the first sector is not congruent with the second fluid guide arrangement of the second sector.
- Such a design enhances the cooling of the coil units in a horizontal direction and further reduces the spreading of hot spots along the horizontal or circumferential direction of the coil units.
- A coil unit comprising a hot spot in the first sector is thus cooled more efficiently in an adjacent, second sector.
- Preferably the cooling fluid follows a fluid flow pattern, which is generated by the different fluid guide arrangements, whereby the different fluid guide arrangements result in different fluid flow patterns.
- The fluid flow patterns are used to cool the coil units and they may further indicate the different flow velocities of the cooling fluid within the static electric induction system.
- In another embodiment the static electric induction system, or transformer, may comprise inner and outer coil unit spacer ribs, whereby the coil unit spacers are arranged in between the inner and outer coil unit spacer ribs.
- The vertical inner and outer coil unit spacer ribs may be configured to receive coil unit spacers at any height and the coil unit spacers may be suitably connected to the inner and outer coil unit spacer ribs.
- Having the coil unit spacers in line with vertical inner and outer coil unit spacer ribs has the advantage of having intermediate fluid ducts that have no disruptions in between the vertical inner and outer coil unit spacer ribs.
- In an embodiment the static electrical induction system may comprise a third sector adjacent the second sector, wherein the third sector comprises a third fluid guide arrangement that is different from the first and second fluid guide arrangements of the first and second sector.
- Thus also the fluid flow pattern of the first, second and third sector may be different from one another.
- Advantageously a density of inner and outer fluid guides is higher in a top region of the coil assembly than in a bottom region of the coil assembly.
- Towards the top region there may be more fluid guides positioned than towards the bottom region.
- The amount of intermediate fluid ducts in between two subsequent inner or outer fluid guides highly affects the cooling fluid flow in the intermediate fluid ducts.
- As an example, the fluid flow in the intermediate fluid ducts increases by about 50% when the distance is reduced from six coil units to four coil units. Thus the placement of the fluid guides is a very effective to cool the static electric induction system.
- The static electric induction system or transformer may be driven by natural convection.
- Alternatively, the static electric induction system may comprise a pump drive configured to drive the cooling fluid in the static electric induction system or transformer.
- Thus the above described configuration may be used in oil directed (OD) cooled transformers or in oil forced (OF) cooled transformers.
- In another embodiment the amount of inner and outer fluid guides in a fluid guide arrangement differs from the amount of inner and outer fluid guides in another fluid guide arrangement.
- Thus the amount of fluid guides do not have to be necessarily the same in the first, second or third sector. They may vary in each sector, given that the cooling is optimized by using less or more oil guides in one sector than in an adjacent sector.
- The herein described further concerns a method of arranging fluid guides in a static electric induction system comprising the steps of:
- conducting a thermal analysis of the static electric induction system during use;
- identifying hot spots and regions with increased temperature in the thermal analysis;
- distributing and fixing the fluid guides based on the thermal analysis in order to reduce the hotspots and regions with increased temperature.
- Such a method has the advantage, that the static electric induction system can be configured and equipped depending on material and construction characteristics of the specific transformer. The static electric induction system may in the end, after the thermal analysis, even comprise less fluid guides than a known transformer system comprising a symmetrical arrangement of fluid guides, since the thermal analysis may reveal that not that many fluid guides are necessary to efficiently cool the transformer.
- Typical fluid guide arrangement patterns may comprise configurations where robustness versus lower maximum hot spots was taken into account or where different cooling modes (pump operating and not operating) has been taken into account. In addition fluid guide arrangement configurations may be chosen depending on different typical load cases of the transformer, different external conditions (desert, arctic conditions, weather and temperature) or different conditions of the transformer, such as for example during start-up phase or during steady-state phase. It may also be possible to invert the fluid guide patterns, such as arranging the outer fluid guides according to the inner pattern and the inner fluid guides according to the outer pattern.
- All these configurations are within the scope of the present invention and they may accordingly influence the arrangement configuration and arrangement of the fluid guides.
- Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the element, system, apparatus, component, arrangement, pattern, means, step, etc." are to be interpreted openly as referring to at least one instance of the element, system, apparatus, arrangement, pattern, component, means, step, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
- The invention is now described, by way of example, with reference to the accompanying drawings, in which:
-
Fig. 1 shows an exemplary section of a transformer as it is known in the prior art; -
Fig. 2 shows a schematic front view of a portion of the transformer as it is known in the prior art; -
Fig. 3 shows a view onto a cross section of the embodiment offigure 2 ; -
Fig. 4 illustrates a perspective view onto a portion of a static electric induction system or a transformer according to the invention; -
Fig. 5 schematically illustrates a front view onto a portion of a static electric induction system or transformer according to the invention; -
Fig. 5a schematically illustrates another embodiment of the invention; -
Fig. 6 schematically illustrates a view onto a cross section of a transformer according to the invention; and -
Fig. 7 schematically illustrates a front view onto a portion of a transformer according to another embodiment of the invention. - The invention will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the static electrical induction system are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments of the static electric induction system or transformer system are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout the description.
- Referring to the
figures 1 to 3 , which illustrate the prior art, a section of acoil assembly 6 of a static electric induction system 1 is shown. Thecoil assembly 6 comprises a number of, in the present case six,coil units 16, which are disc-shaped and arranged on top of one another, spaced apart bycoil unit spacers 20. The coil unit spacers 20 are arranged in between twoconsecutive coil units 16. The coil unit spacers 20 may be shaped as flat disc segments as shown infigure 1 . Two consecutive, as seen along the circumference of thecoil unit 16, coil unit spacers 20 arranged in thecoil unit pitch 18 and two consecutive, as seen in a vertical direction of thecoil assembly 6,coil units 16 define a horizontalintermediate fluid duct 32, which extends through thecoil assembly 6 from an outer side orperiphery 38 of thecoil units 16 andcoil assembly 6, respectively, to an inner side orperiphery 40 of thecoil units 16 andcoil assembly 6, respectively. - The
intermediate fluid ducts 32 are configured to let cooling fluid pass through, preferably dielectric fluid, which is normally a liquid, of a cooling system. Thecoil assembly 6 further comprises vertical inner and outer coilunit spacer ribs 21 22, which are configured to hold and position inner andouter shells coil unit spacers 20, thecoil assembly 6 andcoil units 16, respectively, in position. The vertical inner and outer coilunit spacer ribs figure 1 ) define a plurality ofvertical fluid ducts coil units 16, as illustrated infigure 3 , which also refers to the prior art. - Two neighbouring vertical
inner spacer ribs 21 and two corresponding verticalouter spacer ribs 22 define afirst sector 2, which comprises a corresponding fluid guide arrangement A. The fluid guide arrangement A comprises inner and outer flow control members24', 26'. - The inner and outer flow control members24', 26' are positioned in a symmetrical manner in the
fluid ducts intermediate fluid ducts 32, as illustrated infigure 1 and3 . - The fluid guide arrangement A, A' and the
intermediate fluid ducts 32 result in afluid flow pattern 10 of the cooling fluid as illustrated infigure 3 (static electric induction system in use). In the prior art thefluid flow patterns 10 and the fluid guide arrangements A, A' are the same and/or they are congruent with each other. - Referring now to
figure 2 which illustrates fluid guide arrangements A, A' comprising the inner and outer flow control members24', 26', a first fluid guide arrangement A is vertically and centrally shifted from a second fluid guide arrangement A'. The flow control members24', 26', infigure 2 exemplary the outer flow control members26' of the first fluid guide arrangement A, are arranged with a constant vertical distance as counted incoil units 16, namely every threecoil units 16. The outer flow control members26' of the adjacent second fluid guide arrangement A' are arranged vertically shifted but shifted in that theouter fluid guide 26 of the second fluid guide arrangement A' is arranged centrally in between two subsequent outer flow control members26' of the first fluid guide arrangement A, as seen in a vertical direction. The arrangement of the flow control members26' and thus the fluid guide arrangements A, A' are symmetrical, since the patterns are repeating and since the first and second fluid guide arrangements A, A' are not different form one another but only vertically and centrally shifted. - The flow control members24', 26' shown in the prior art are not configured to substantially block the
vertical fluid ducts vertical fluid ducts intermediate fluid ducts 32. - When a fluid guide arrangement A, A' as shown in
figures 1 to 3 is used, a hot spot may usually always occur at the same position, whereas when different or non periodical or only partially periodical fluid guide arrangements are installed or used, the hot spots can not occur at the same position and they are therefore reduced or even eliminated. - In a transformer design only the absolute maximum temperature is relevant to define the hottest spot. Thus it is rather important to reduce the temperature of the hottest or "maximal" hot spots and to prohibit the spreading of hot spots.
- Referring now to
figures 4 to 7 , which exemplary illustrate embodiments of the present invention, the fluid guide arrangements A, B vary and they are different from one another. -
Figure 4 illustrates a portion of the transformer or static electric induction system 1, in which afirst sector 2 and an adjacent second sector 2' are illustrated. The first andsecond sectors 2, 2' are defined or limited by a pair of vertical inner - and a pair of corresponding verticalouter spacer ribs second sector 2, 2' comprises a different fluid guide arrangement A, B. Thefirst sector 2 comprises a first fluid guide arrangement A and the second sector 2' comprises a second fluid guide arrangement B. The inner and outer fluid guides 24, 26 of one fluid guide arrangement A, B are always arranged depending on each other, which becomes clear whenfigure 6 is considered.Figure 6 illustrates the coolingfluid flow pattern 10 within the static electric induction system 1. The inner fluid guides 24 and the outer fluid guides 26 of each fluid guide arrangement A, B are arranged in order to create afluid flow pattern 10, 10' that ensures an efficient cooling of the transformer or static electric induction system 1. An outer and aninner fluid guide - The inner fluid guides 24 and the outer fluid guides 26 are configured to almost completely or substantially block the
vertical fluid ducts - In
figure 4 foursectors 2, 2' are illustrated, whereby thefirst sector 2 and the second sector 2' are arranged in an alternating manner. The fluid guide arrangement A of thefirst sector 2 comprises in total six outer fluid guides 26 arranged in a non periodical manner over the height of the transformer 1. The vertical distances as counted incoil units 16 between two subsequent outer fluid guides 26 vary and these distances are not constant over the height. This provides a more effective cooling of potential hot spots since the risk of the hot spots spreading, especially in horizontal direction is substantially reduced as compared to the prior art. - The
sectors 2, 2' have all the same size, since the vertical inner and outer coilunit spacer ribs outer periphery coil assembly 6. - As mentioned in the introduction, the vertical positioning and the amount of
coil units 16 in between two subsequent inner and/or outer fluid guides 24, 26 has a substantial influence on the fluid that passes in theintermediate fluid ducts 32 and thus a substantial influence on the cooling performance. - The inner and outer fluid guides 24, 26 are arranged in between the vertical inner and or outer coil
unit spacer ribs inner periphery 38 and theinner shell 14 and between theouter periphery 40 and theouter shell 40, respectively. The inner and outer fluid guides 24, 26 are preferably ring-segment shaped and connected to respective two consecutive vertical inner and outer coilunit spacer ribs unit spacer ribs unit spacer ribs - The inner and
outer shells -
Figure 5 schematically illustrates a front view of a portion of a static electric induction system 1 comprising outer fluid guides 26, verticalouter spacer ribs 22 andcoil units 16 which form thecoil assembly 6. The fluid guide arrangements A of thefirst sector 2 are vertically shifted but not centrally shifted, namely by onecoil unit pitch 18 or by onecoil unit 16 and the vertical distances as counted incoil units 16 between the subsequent out fluid guides 26, as seen from the bottom of thecoil assembly 6 is first threecoil units 16 and then twocoil units 16. Thus the distances are not constant over the height of thecoil assembly 6. Althoughfigure 5 only illustrates the outer fluid guides 26, similar arrangements which are not congruent with the arrangement of the outer fluid guides 26, are used for the inner fluid guides 24. The arrangement of the inner fluid guides 24 and the arrangement of outer fluid guides 26 in onesector 2, 2' forms the fluid guide arrangement A, B. - The
coil assembly 6 is cylindrically shaped as illustrated partially infigure 4 ant thusfigure 6 illustrates a cross section cut through a static electric induction system 1, illustrating the fluid guide arrangement A of afirst sector 2 and the fluid guide arrangement B of a second sector 2'. The cross section illustrated infigure 6 is not related to the portion of the static electric induction system 1 shown infigure 5 . -
Figure 5a schematically illustrates another embodiment of the static electric induction system 1. The fluid guide arrangements A of thefirst sector 2 has a constant distance (same number of coil units) between fluid guides over the height of thecoil assembly 6 and the fluid guide arrangements B of the second sector 2' has a not constant distance (different number of coil units) between fluid guides over the height of thecoil assembly 6. The distances, in the vertical direction, between guides in arrangement B, is smaller in the top part than in bottom part. The fluid guide arrangements infig 5a leads to that the fluid flow, and thus the cooling, in the top part of sector B is higher and thus a better cooling of thecoil assembly 6, overall. - In
figure 6 , the inner and outer fluid guides 24, 26 are distributed non-periodically in order to improve the efficiency of the cooling of thecoil units 16. In the shown embodiment thecoil units 16 arecoil discs 37. It is further illustrated infigure 6 , that the inner and outer fluid guides 24, 26 are configured to substantially block thevertical fluid ducts -
Figure 7 schematically illustrates another solution according to the invention comprising afirst sector 2, a second 2' and athird sector 2", whereby each sector comprises a different fluid guide arrangement A, B, C. Thefirst sector 2 comprises a first fluid guide arrangement A, the second sector comprises a second fluid guide arrangement B and thethird sector 2" comprises a third fluid guide arrangement C. Infigure 7 only the outer fluid guides 26 of the fluid guide arrangements A, B, C are shown. It is however clear that the inner fluid guides 24 are distributed and positioned dependent and the outer fluid guides 26 in order to create thefluid flow pattern 10, 10' without fluid flow blockages. The third fluid guide arrangement C results in a fluid flow pattern (not shown), which is different from the fluid flow patterns of the first and second fluid guide arrangements A, B of the first andsecond sector 2, 2'. As can be seen fromfigure 5 the amount of outer fluid guides 26 is four in the first and second fluid guide arrangements A, B of the first andsecond sectors 2, 2' and it is five in the third fluid guide arrangement C of thethird sector 2". The amount of the corresponding inner fluid guides 24 may be the same as the amount of outer fluid guides 26 in the fluid guide arrangments A, B, C or not. The amount and distribution of the fluid guides 24, 26 depends on a thermal analysis of the static electric induction system. The thermal analysis reveals hot spots and regions with increased temperatures. According to the thermal analysis the fluid guides 24, 26 are distributed within the static electrical induction system. - As previously mentioned the density, thus the amount of fluid guides 24, 26 arranged in a top region of the static electric induction system 1 or
coil assembly 6 may be higher than in a middle region or a lower region. A higher density of fluid guides 24, 26 increases the fluid flow in theintermediate ducts 32 significantly and it may thus improve the cooling in the top region of the transformer. - The invention has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims.
Claims (14)
- A static electric induction system comprising:- cooling fluid,- an outer shell (12) and an inner shell (14),- a coil assembly (6) comprising a plurality of coil units (16), stacked on top of one another and positioned in between the outer and inner shells (12, 14), and a plurality of coil unit spacers (20) configured to form a plurality of intermediate fluid ducts (32) between the coil units (16),- a first and an adjacent second sector (2, 2'), each sector (2, 2') comprising a fluid guide arrangement (A, B) having a plurality of fluid guides (24, 26), wherein
the vertical distance, as counted in coil units (16), between one pair of two subsequent fluid guides (24, 26) of a sector (2, 2') differs from a vertical distance, as counted in coil units (16), between another pair of two subsequent fluid guides (24, 26) of the same sector (2, 2') and wherein the first fluid guide arrangement (A) of the first sector (2) differs from the second fluid guide arrangement (B) of the second sector (2'). - The static electric induction system according to claim 1, wherein the first and second fluid guide arrangements (A, B) comprise inner fluid guides (24) arranged next to the inner shell (14) and outer fluid guides (26) arranged next to the outer shell (12).
- The static electric induction system according to claim 1 or 2, wherein the vertical distance, as counted in coil units (16), between one pair of two subsequent inner or outer fluid guides (24, 26) of a sector (2, 2') differs from a vertical distance, as counted in coil units (16), between another pair of two subsequent inner or outer fluid guides (24, 26) of the same sector (2, 2').
- The static electric induction system according to any of the previous claims, wherein the inner and outer fluid guides (24, 26) are arranged in a non-periodical manner across at least two sectors (2, 2').
- The static electric induction system according to any of the previous claims, comprising inner vertical fluid ducts (28) and outer vertical fluid ducts (30).
- The static electric induction system according to the previous claim, wherein the inner and outer fluid guides (24, 26) are configured to substantially block a vertical cooling fluid flow in the inner and outer vertical fluid ducts (30, 28), respectively.
- The static electric induction system according to any of the previous claims, wherein the first fluid guide arrangement (A) of the first sector (2) is not congruent with the second fluid guide arrangement (B) of the second sector (2').
- The static electric induction system according to the previous claim, wherein the cooling fluid defines a fluid flow pattern (10, 10', 10") and wherein the different fluid guide arrangements (A, B, C) result in different fluid flow patterns (10, 10', 10").
- The static electric induction system according to any of the previous claims, comprising inner and outer coil unit spacer ribs (21, 22), wherein the coil unit spacers (20) are arranged in between the inner and outer coil unit spacer ribs (21, 22).
- The static electric induction system according to any of the previous claims, comprising a third sector (2") adjacent the second sector (2'), wherein the third sector (2") comprises a third fluid guide arrangement (C) that is different from the first and second fluid guide arrangements (A, B) of the first and second sector (2, 2').
- The static electric induction system according to any of the previous claims, wherein a density of inner and outer fluid guides (24, 26) is higher in a top region of the coil assembly (6) than in a bottom region of the coil assembly.
- The static electric induction system according to any of the previous claims, wherein the cooling fluid is driven by natural convection.
- The static electric induction system according to any of the previous claims, comprising a pump drive configured to drive the cooling fluid in the static electric induction system.
- The static electric induction system according to any of the previous claims, wherein the amount of inner and outer fluid guides (24, 26) in the first or second fluid guide arrangement (A, B) differs from the amount of inner and outer fluid guides in the third fluid guide arrangement (C).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13185589.2A EP2851912B1 (en) | 2013-09-23 | 2013-09-23 | Static electric induction system |
CN201480061740.4A CN105723478B (en) | 2013-09-23 | 2014-09-22 | Electrostatic induction system |
PCT/EP2014/070129 WO2015040213A1 (en) | 2013-09-23 | 2014-09-22 | Static electric induction system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13185589.2A EP2851912B1 (en) | 2013-09-23 | 2013-09-23 | Static electric induction system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2851912A1 true EP2851912A1 (en) | 2015-03-25 |
EP2851912B1 EP2851912B1 (en) | 2020-06-24 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP13185589.2A Active EP2851912B1 (en) | 2013-09-23 | 2013-09-23 | Static electric induction system |
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EP (1) | EP2851912B1 (en) |
CN (1) | CN105723478B (en) |
WO (1) | WO2015040213A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3385962A1 (en) | 2017-04-05 | 2018-10-10 | ABB Schweiz AG | Static electric induction apparatus comprising a winding and a sensor system for monitoring the temperature in the winding |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019204883A (en) * | 2018-05-24 | 2019-11-28 | 富士電機株式会社 | Cooling structure of induction electrical apparatus winding and induction electrical apparatus |
EP3817512B1 (en) * | 2019-10-29 | 2024-04-17 | Hitachi Energy Ltd | Static electric induction system and method |
EP3940727A1 (en) * | 2020-07-13 | 2022-01-19 | Hitachi Energy Switzerland AG | A static electric induction arrangement |
EP4199014A1 (en) | 2021-12-17 | 2023-06-21 | Hitachi Energy Switzerland AG | Static electric induction device and operating method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS57148322A (en) * | 1981-03-11 | 1982-09-13 | Hitachi Ltd | Self-cooling stationary inductor coil winding |
JPH05275246A (en) * | 1992-03-25 | 1993-10-22 | Meidensha Corp | Cooling structure of electromagnetic induction disc winding |
JPH07263248A (en) * | 1994-03-23 | 1995-10-13 | Toshiba Corp | Gas-cooled electric power machine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US4028653A (en) * | 1976-04-01 | 1977-06-07 | Asea Aktiebolag | Electrical equipment having radial cooling channels with means for guiding cooling fluid through the channels |
US4245206A (en) * | 1977-03-26 | 1981-01-13 | Hitachi, Ltd. | Winding structure for static electrical induction apparatus |
CN2594944Y (en) * | 2003-01-14 | 2003-12-24 | 特变电工衡阳变压器有限公司 | Self oil circulating structure of transformer |
CN201262869Y (en) * | 2008-09-16 | 2009-06-24 | 保定天威集团有限公司 | Guide structure for transformer coil oil |
-
2013
- 2013-09-23 EP EP13185589.2A patent/EP2851912B1/en active Active
-
2014
- 2014-09-22 CN CN201480061740.4A patent/CN105723478B/en active Active
- 2014-09-22 WO PCT/EP2014/070129 patent/WO2015040213A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57148322A (en) * | 1981-03-11 | 1982-09-13 | Hitachi Ltd | Self-cooling stationary inductor coil winding |
JPH05275246A (en) * | 1992-03-25 | 1993-10-22 | Meidensha Corp | Cooling structure of electromagnetic induction disc winding |
JPH07263248A (en) * | 1994-03-23 | 1995-10-13 | Toshiba Corp | Gas-cooled electric power machine |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3385962A1 (en) | 2017-04-05 | 2018-10-10 | ABB Schweiz AG | Static electric induction apparatus comprising a winding and a sensor system for monitoring the temperature in the winding |
WO2018184850A1 (en) | 2017-04-05 | 2018-10-11 | Abb Schweiz Ag | Static electric induction apparatus comprising a winding and a sensor system for monitoring the temperature in the winding |
US11024457B2 (en) | 2017-04-05 | 2021-06-01 | Abb Power Grids Switzerland Ag | Static electric induction apparatus comprising a winding and a sensor system for monitoring the temperature in the winding |
Also Published As
Publication number | Publication date |
---|---|
WO2015040213A1 (en) | 2015-03-26 |
EP2851912B1 (en) | 2020-06-24 |
CN105723478B (en) | 2018-07-17 |
CN105723478A (en) | 2016-06-29 |
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