WO2019092909A1 - Transformateur à bain d'huile - Google Patents

Transformateur à bain d'huile Download PDF

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Publication number
WO2019092909A1
WO2019092909A1 PCT/JP2018/020938 JP2018020938W WO2019092909A1 WO 2019092909 A1 WO2019092909 A1 WO 2019092909A1 JP 2018020938 W JP2018020938 W JP 2018020938W WO 2019092909 A1 WO2019092909 A1 WO 2019092909A1
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WO
WIPO (PCT)
Prior art keywords
oil
container
filled transformer
lid
heat transfer
Prior art date
Application number
PCT/JP2018/020938
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English (en)
Japanese (ja)
Inventor
美稀 山崎
直道 工藤
邦彦 安東
桑原　正尚
佐藤　孝平
海津　朋宏
Original Assignee
株式会社日立産機システム
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 株式会社日立産機システム filed Critical 株式会社日立産機システム
Publication of WO2019092909A1 publication Critical patent/WO2019092909A1/fr

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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
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil 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
    • H01F27/08—Cooling; Ventilating
    • H01F27/22—Cooling by heat conduction through solid or powdered fillings

Definitions

  • the present invention relates to a heat dissipation structure of an oil filled transformer, in particular, an oil filled transformer.
  • the container of an oil-filled electrical device such as an oil-filled transformer contains insulating oil as an insulating medium.
  • the insulating oil is expanded by the temperature rise due to the electric heat of the electric device, and the internal pressure of the container is increased, so the container needs to have a sufficient strength so as not to deform.
  • the heat dissipation performance which can control the temperature rise of insulating oil with low heat conduction is required.
  • Patent Document 1 JP-A-53-35122
  • FIGS. 7 and 8 the upper and lower end portions of the fin-like overhanging portion 2 as a heat dissipating rib are drawn inwardly to form a surface joint portion 3 in close contact. Then, welding the upper and lower end portions of the overhanging portion 2 along the surface joint portion 3 and making the welding line uniaxially only, while a convex or concave reinforcing bead on the plate field of the overhanging portion 2
  • the reinforcement beads 4 are formed to increase the mechanical strength of the overhang portion 2.
  • insulating oil 6 is considered to be convective in the path of the arrows when heated by energization of the conductor of coil 7 inside, and heat dissipation ribs are used to increase the heat dissipation area. 2 is provided largely. That is, when the insulating oil 6 is heated by the conductor of the coil 7 provided on the iron core 9, it rises upward, flows from there to the inside of the heat dissipating rib 2, and is cooled by the heat dissipating function of the heat dissipating rib 2. The circulation which descends from the outer peripheral side of the heat radiation rib 2 and returns to the coil 7 side is expected. As shown in FIG.
  • An object of the present invention is to provide an oil-impregnated transformer capable of achieving both a reduction in size and a reduction in weight of a container while securing desired heat dissipation performance.
  • An oil-filled transformer having an iron core, a coil wound around the iron core, a container for containing the iron core and the coil, and a lid for closing the upper part of the container, wherein the container contains an insulating oil.
  • a heat transfer member having a thermal conductivity higher than that of the insulating oil is provided through the upper surface and the lower surface of the lid, or the lower surface of the lid is in contact with the insulating oil It is characterized in that it is arranged as follows.
  • the container since it is not necessary to provide the container with the heat radiation rib, the container can be made smaller and lighter.
  • the heat dissipating rib is not provided, there is no fear that the heat dissipating rib is bent due to the rise in the internal pressure of the container, and reliability in strength can be secured.
  • FIG. 6 is a perspective view showing an example of a container of the oil-filled transformer of the first embodiment.
  • FIG. 2 is a cross-sectional view showing an example of an oil-impregnated transformer of Example 1; It is explanatory drawing of the upper surface of the modification of the oil-impregnated transformer of Example 1.
  • FIG. It is explanatory drawing of the upper surface of the modification of the oil-impregnated transformer of Example 1.
  • FIG. It is explanatory drawing of the upper surface of the modification of the oil-impregnated transformer of Example 1.
  • FIG. 1 It is explanatory drawing of the upper surface of the modification of the oil-impregnated transformer of Example 1.
  • FIG. It is a perspective view which shows an example of the container of the conventional oil-filled transformer. It is a front view which shows the conventional radiation rib attached to a container. It is explanatory drawing which shows the convection of the oil in the conventional oil-filled transformer. It is explanatory drawing which shows the convection of the oil in a small oil-filled transformer. It is sectional drawing of the oil-impregnated transformer of Example 2 of this invention. It is explanatory drawing of the upper surface of the oil-impregnated transformer of Example 2. FIG. It is sectional drawing of the oil-impregnated transformer of Example 3 of this invention.
  • FIG. 18 is a cross-sectional view of a modification of the single-phase above-column oil-filled transformer of the fourth embodiment.
  • FIG. 16 is a temperature rise distribution map by heat transfer analysis of the single-phase, pole-mounted, oil-filled transformer of the fourth embodiment. It is a temperature rise distribution figure by heat transfer analysis of the conventional single phase pole top oil-filled transformer. It is sectional drawing of the single phase pole top oil-impregnated transformer of Example 5 of this invention.
  • FIG. 1A is a cross-sectional view of the oil-filled transformer
  • FIG. 1B is a top view of the container lid of FIG. 1A.
  • FIG. 1A shows a three-phase three-leg oil filled transformer consisting of U phase 11, V phase 12, and W phase 13.
  • FIG. 1A shows a three-phase three-leg oil filled transformer consisting of U phase 11, V phase 12, and W phase 13.
  • the oil-filled transformer of this embodiment includes an iron core 9, a coil 7 (U phase 11, V phase 12, W phase 13) wound around the iron core 9, an iron core 9, a coil 7 and an iron core 9 or a coil 7. It has the container 1 which accommodates the fixing member (not shown) arrange
  • the insulating oil 6 is accommodated in the container 1 to a position higher than the upper portion of the fixing member.
  • the lid 15 is provided with a plate-shaped cooling fin 16 penetrating the upper surface and the lower surface, and the cooling fin 16 is formed of a heat transfer member having a thermal conductivity higher than that of the insulating oil 6.
  • the insulating oil 6 is in contact with the cooling fins 16, and the insulating oil 6 is disposed between the lower end of the heat transfer member and the fixing member.
  • the cooling fins 16 are contained in the insulating oil, and it is preferable that the contact area between the cooling fins 16 and the insulating oil 6 be large in terms of heat transfer.
  • the cooling fins 16 are disposed on both sides avoiding the high pressure bushings 18, 19, 20 and the low pressure bushings 21, 22, 23.
  • a plurality of cooling fins 16 are provided in parallel to the short side of the container 1.
  • the height of the cooling fin 16 may be equal to the height of the bushing, but is not limited thereto.
  • the coil 7 is provided close to the side surface of the container 1, the convection of the insulating oil 6 in the container 1 is small, and the cooling is mainly performed by It is done by heat conduction. Therefore, cooling is less dependent on the direction of the cooling fins 16 in the container 1, and it is sufficient to provide as many cooling fins 16 as possible.
  • the installation direction of the cooling fins 16 outside the container 1 may not be able to prevent the flow of heat due to the distribution of heat, and it may be installed in the direction in which air is convective.
  • the coil 7 and the iron core 9 When the oil-filled transformer is operated, the coil 7 and the iron core 9 generate heat and the temperature of the insulating oil 6 rises, but the heat is transferred to the outside of the container 1 through the cooling fin 16 which is a heat transfer member. Heat is dissipated inside. Further, the container 1 and the lid 15 of the container are usually formed of a steel plate, and part of the heat is also transferred from the cooling fins 16 to the lid 15 of the container and is also dissipated from the lid 15 into the air.
  • the coil 7 of one or more phases is housed inside the rectangular parallelepiped container 1 and the insulating oil 6 is filled around the coil.
  • the heat dissipation rib 2 is provided in the outer side of the container 1 by fixed spacing over the perimeter.
  • the primary coil portion and the secondary coil portion constituting the coil 7 become heat sources due to energization, so the contact portion of the coil between the U-phase, V-phase and W-phase becomes the maximum temperature among the conductor portions.
  • FIG. 1A in the iron core-coil assembly in which the iron core 9 and the coil 7 are assembled, a plurality of phases (U phase 11, V phase 12 and A coil 7 of W phase 13) is provided.
  • FIG. 2A shows a perspective view of the container 1 of the oil-filled transformer
  • FIG. 2B shows a cross-sectional view of the container 1 containing the coil 7 and the like.
  • a recess 1a or the like is provided on the surface of the container 1 facing the portion where the coils 7 of a plurality of phases approach, so that the insulating oil 6 provided on the outer periphery of the coil 7 has a constant layer thickness. ing.
  • the recess 1 a extends in the axial direction of the coil 7 and is recessed toward a portion where coils of a plurality of phases approach.
  • the surface of the container 1 is formed by a curved surface extending along the outer peripheral surface of the coil 7 so that the insulating oil 6 on the outer peripheral surface of the coil 7 has a substantially constant layer thickness. This makes it possible to reduce the distance from the container periphery to the necessary distance for insulation performance while securing the required distance for insulation performance.
  • the thermal conductivity of the insulating oil 6 is, for example, as small as 0.12 W / m ⁇ K, but the thermal conductivity of the metal container is, for example, relatively large as 80 W / m ⁇ K. Heat dissipation performance can be improved by reducing the thickness of the insulating oil having low heat transfer performance and reducing the distance to the container having a relatively large heat transfer.
  • embossing it is preferable to form a plurality of projections or depressions (dimples) on the surface of the container 1 by, for example, embossing, to increase the surface area of the container.
  • a container 1 which contains an iron core 9, a coil 7 wound around the iron core 9, the iron core 9, the coil 7, and a fixing member disposed on the iron core or the coil.
  • a transformer 15 having a lid 15 at the upper part of the container 1, wherein the insulating oil 6 is accommodated in the container 1 to a position higher than the upper part of the fixing member, and penetrates the upper and lower parts of the lid 15;
  • a heat transfer member (cooling fin 16) having a thermal conductivity higher than that of the insulating oil 6, and the insulating oil 6 is in contact with the heat transfer member, and the lower end of the heat transfer member and the fixing member The insulating oil 6 is disposed in between.
  • significant reduction in size and weight can be realized by reducing the distance for convection of the insulating oil without providing the heat dissipation ribs, and the heat source can be reduced by thinning the insulating oil layer.
  • the heat dissipation from the coil can be improved.
  • the cooling fins 16 equal to the height of the bushings are made to penetrate the lid using the bushing penetration and sealing method that has already been established, and by contacting the oil, no heat dissipating ribs around the container are provided. The heat transfer role similar to the heat dissipating rib can be expected.
  • 3 to 5 show modified examples in which the installation position of the cooling fin 16 is changed.
  • 3 to 5 are views of the oil filled transformer as seen from above the lid.
  • a plurality of cooling fins 16 are provided on both sides of the bushings 18 to 23 along the long side of the container 1.
  • a plurality of cooling fins 16 are provided diagonally on the side of the container 1 on both sides of the bushings 18 to 23.
  • a plurality of cooling fins 16 are provided on both sides of the bushings 18 to 23 in a V shape.
  • FIG. 6 shows another modification using the cooling pin.
  • a plurality of rod-like (cylindrical or prismatic) cooling pins 30 which vertically penetrate the lid 15 of the container are disposed. Similar to the cooling fins 15, the heat of the insulating oil 6 is transferred through the cooling pins 30 and dissipated to the outside of the container.
  • the shape may be changed between the inside and the outside of the container 1 so as to be a rod-shaped cooling pin on the inside and a plate-shaped cooling fin on the outside.
  • the cooling fins 16 and the cooling pins 30 which are installed through the lid 15 used in the present embodiment can be attached to the existing oil-filled transformer, and after attachment, the same sealing material as the bushing is used. If you overturn.
  • FIG. 11A is a cross-sectional view of the oil-filled transformer
  • FIG. 11B is a top view of the container lid of FIG. 11A.
  • FIG. 11A shows a three-phase three-leg oil filled transformer consisting of U phase 11, V phase 12, and W phase 13.
  • the oil-filled transformer of this embodiment includes an iron core 9, a coil 7 (U phase 11, V phase 12, W phase 13) wound around the iron core 9, an iron core 9, a coil 7 and an iron core 9 or a coil 7.
  • the container 1 which accommodates the fixing member (not shown) arrange
  • the insulating oil 6 is accommodated in the container 1 to a position higher than the upper portion of the fixing member.
  • the container 1 and the lid 15 of the container are usually formed of steel plates.
  • the cooling fins 16 formed of the heat transfer member are in contact with the lid 15 of the container, and the heat of the insulating oil 6 is transferred to the lid 15 of the container through the cooling fins 16 and dissipated into the air from the lid 15 Ru.
  • the heat dissipating rib 2 is provided around the container 1.
  • the heat dissipating rib 2 it is preferable to arrange the heat dissipating fins 16 in the container so as not to prevent the convection of the insulating oil 6. Note that the heat dissipating rib 2 may not be provided as long as heat can be sufficiently dissipated from the lid 15 of the container.
  • the heat dissipation rib is provided around the container, and while the installation area is the same as the conventional, the heat is dissipated by radiating heat from the lid of the container as well.
  • the capacity can be improved, and the current-carrying capacity can be made larger than in the prior art.
  • FIG. 12A and 12B show an oil filled transformer according to a third embodiment of the present invention.
  • FIG. 12A is a cross-sectional view of the oil-filled transformer
  • FIG. 12B is a top view of the container lid of FIG. 12A.
  • FIG. 12A shows a three-phase three-leg oil filled transformer consisting of U phase 11, V phase 12, and W phase 13.
  • the oil-filled transformer of this embodiment includes an iron core 9, a coil 7 (U phase 11, V phase 12, W phase 13) wound around the iron core 9, an iron core 9, a coil 7 and an iron core 9 or a coil 7.
  • the container 1 which accommodates the fixing member (not shown) arrange
  • the insulating oil 6 is accommodated in the container 1 to a position higher than the upper portion of the fixing member.
  • the heat of the insulating oil 6 is transferred to the outside of the container through the cooling fins 16 formed of the heat transfer member, and dissipated into the air.
  • the heat dissipating rib 2 is provided around the container 1 and the heat is dissipated to the outside via the heat dissipating rib 2 as well.
  • the heat dissipating rib 2 it is preferable to arrange the heat dissipating fins 16 in the container so as not to prevent the convection of the insulating oil 6.
  • the heat dissipation rib is provided around the container, and while the installation area is the same as the conventional, the heat is dissipated by radiating heat from the lid of the container as well.
  • the capacity can be improved, and the current-carrying capacity can be made larger than in the prior art.
  • FIG. 13 shows a single-phase, pole-mounted, oil-filled transformer of Embodiment 4 of the present invention.
  • FIG. 13 is a cross-sectional view of a single-phase pole-mounted oil-filled transformer.
  • the single-phase oil-filled transformer of this embodiment includes an iron core 9, a coil 7 wound around the iron core 9, an iron core 9, a coil 7, and fixing members disposed on the iron core 9 or coil 7 (see FIG. Not shown) and a lid 15 at the top of the container.
  • the insulating oil 6 is accommodated in the container 1 to a position higher than the upper portion of the fixing member.
  • a cooling fin 16 formed of a heat transfer member having a thermal conductivity higher than that of the insulating oil 6 is provided through the upper and lower surfaces of the lid, and the insulating oil 6 is in contact with the cooling fin 16.
  • a large number of cooling fins are provided on the upper surface of the lid 15 in addition to the cooling fins 16 penetrating the upper and lower surfaces of the lid, and the cooling fins 16 and the lid 15 are in contact with each other.
  • the terminals are provided on the side plates of the container without providing the terminals on the lid.
  • the fixing member (not shown) disposed on the upper part of the iron core 9 or the coil 7, the lead wire of the terminal or the like is present in the central part or the peripheral part of the container There is a portion (central portion or peripheral portion) where the fins 16 can not be installed.
  • FIG. 13 shows a configuration assuming that there is a portion where the cooling fins 16 can not be installed at the inner peripheral portion of the container, and the cooling fins 16 penetrating the lid of the container are provided only at the central portion and provided at the other peripheral portions.
  • the cooling fins 16 are formed in a structure not passing through the lid.
  • FIG. 14 shows a configuration assuming that there is a portion where the cooling fin 16 can not be installed at the central portion inside the container, and the cooling fin 16 penetrating the lid of the container is provided only at the peripheral portion, and the other lids are central
  • the cooling fin 16 provided in the part is formed in the structure which has not penetrated the lid
  • the cooling fins 16 formed of the heat transfer member are in contact with the lid 15 of the container, and the heat of the insulating oil 6 is dissipated into the air through the cooling fins 16 penetrating the lid, and the cooling fins 16 The heat is transferred to the lid 15 of the container, and from the cooling fins not passing through the lid 15, the heat is dissipated into the air.
  • the plurality of cooling fins 16 and the lid 15 of the container can be integrally formed of aluminum or the like.
  • FIG. 15 is obtained by finite element analysis for the oil-impregnated transformer in which the cooling fins 16 are partially provided in the insulating oil 6 to transfer the heat of the insulating oil 6 to the lid 15 according to the present embodiment. Shows the temperature distribution results.
  • FIG. 16 shows temperature distribution results obtained by finite element analysis for the conventional oil-filled transformer without the cooling fins 16. As shown in FIG. 15, by providing the cooling fins 16 in the insulating oil 6, the temperatures of the iron core 9, the coil 7 and the insulating oil 6 can be lowered.
  • the cooling fin 16 is partially provided in the insulating oil 6 so that the heat of the insulating oil 6 is transferred to the lid, and the cooling fin is maximally provided on the outside of the lid, so that the heat radiation area is made By increasing and radiating heat, it is possible to achieve both downsizing of the oil-filled transformer container and improvement of the heat radiation performance.
  • FIG. 17 shows a single-phase above-column oil-filled transformer of Embodiment 5 of the present invention.
  • a container inner heat transfer member 24 made of a material having a thermal conductivity larger than that of the container 1 is provided around the inside of the container 1.
  • a cylindrical container heat transfer member 24 made of aluminum may be provided in close contact with the inside of the container 1.
  • the container inner heat transfer member 24 may be provided not on the entire circumference of the container but on a part of the container.
  • the heat of the insulating oil 6 is transferred to the container 1 through the container inner heat transfer member 24 having a large thermal conductivity, and is dissipated from the container 1 into the air. Also, although the temperature of the insulating oil is low at the bottom of the container 1 and high at the top, by providing the container inner heat transfer member 24 on the inner periphery of the container 1, the temperature of the insulating oil at the top of the container is lowered. Can.
  • the heat of the insulating oil can be efficiently transferred to the container, and the container can dissipate heat by natural convection of air. Further, by providing the heat transfer member in close contact with the container, it is possible to ensure the strength of the container with respect to the load of the internal pressure due to the rise in oil temperature.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)
  • Housings And Mounting Of Transformers (AREA)

Abstract

L'invention concerne un transformateur à bain d'huile garantissant une capacité de rayonnement thermique souhaitée tout en permettant une réduction à la fois de la taille et du poids du contenant. Le présent transformateur à bain d'huile comprend un noyau de fer, une bobine enroulée autour du noyau de fer, un contenant recevant le noyau de fer et la bobine, et un couvercle fermant la partie supérieure du contenant, l'huile isolante étant reçue dans le contenant. Le transformateur est pourvu d'un élément thermoconducteur ayant une conductivité thermique supérieure à celle de l'huile isolante, l'élément thermoconducteur traversant la surface supérieure et la surface inférieure du couvercle ou étant disposé sur la surface inférieure du couvercle. L'élément thermoconducteur est disposé de manière à se trouver en contact avec l'huile isolante.
PCT/JP2018/020938 2017-11-07 2018-05-31 Transformateur à bain d'huile WO2019092909A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017214443A JP2019087630A (ja) 2017-11-07 2017-11-07 油入変圧器
JP2017-214443 2017-11-07

Publications (1)

Publication Number Publication Date
WO2019092909A1 true WO2019092909A1 (fr) 2019-05-16

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5258722U (fr) * 1975-10-28 1977-04-28
JPS5596626U (fr) * 1978-12-26 1980-07-04
JPS55120119U (fr) * 1979-02-19 1980-08-26
JPS61109115U (fr) * 1984-12-20 1986-07-10
JPS6242513Y2 (fr) * 1981-05-29 1987-10-31
JPS6314410Y2 (fr) * 1981-05-29 1988-04-22
JPH09120918A (ja) * 1995-10-25 1997-05-06 Matsushita Electric Ind Co Ltd 変圧装置
JPH09120917A (ja) * 1995-10-25 1997-05-06 Matsushita Electric Ind Co Ltd 変圧装置
JPH09213533A (ja) * 1996-02-07 1997-08-15 Matsushita Electric Ind Co Ltd 静止誘導電磁機器
JP2008041929A (ja) * 2006-08-07 2008-02-21 Japan Ae Power Systems Corp 静止誘導電器
WO2017110124A1 (fr) * 2015-12-22 2017-06-29 株式会社日立産機システム Transformateur à l'huile

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5258722U (fr) * 1975-10-28 1977-04-28
JPS5596626U (fr) * 1978-12-26 1980-07-04
JPS55120119U (fr) * 1979-02-19 1980-08-26
JPS6242513Y2 (fr) * 1981-05-29 1987-10-31
JPS6314410Y2 (fr) * 1981-05-29 1988-04-22
JPS61109115U (fr) * 1984-12-20 1986-07-10
JPH09120918A (ja) * 1995-10-25 1997-05-06 Matsushita Electric Ind Co Ltd 変圧装置
JPH09120917A (ja) * 1995-10-25 1997-05-06 Matsushita Electric Ind Co Ltd 変圧装置
JPH09213533A (ja) * 1996-02-07 1997-08-15 Matsushita Electric Ind Co Ltd 静止誘導電磁機器
JP2008041929A (ja) * 2006-08-07 2008-02-21 Japan Ae Power Systems Corp 静止誘導電器
WO2017110124A1 (fr) * 2015-12-22 2017-06-29 株式会社日立産機システム Transformateur à l'huile

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