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EP2549495A1 - Transformateur à sec - Google Patents

Transformateur à sec Download PDF

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Publication number
EP2549495A1
EP2549495A1 EP11005855A EP11005855A EP2549495A1 EP 2549495 A1 EP2549495 A1 EP 2549495A1 EP 11005855 A EP11005855 A EP 11005855A EP 11005855 A EP11005855 A EP 11005855A EP 2549495 A1 EP2549495 A1 EP 2549495A1
Authority
EP
European Patent Office
Prior art keywords
winding
transformer
transformer according
dry
cooling channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11005855A
Other languages
German (de)
English (en)
Other versions
EP2549495B1 (fr
Inventor
Marcus Bockholt
Michael Luckey
Wolfgang Mönig
Benjamin Weber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Technology AG
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 ABB Technology AG filed Critical ABB Technology AG
Priority to ES11005855.9T priority Critical patent/ES2679821T3/es
Priority to EP11005855.9A priority patent/EP2549495B1/fr
Priority to PCT/EP2012/002555 priority patent/WO2013010611A1/fr
Priority to CN201280035579.4A priority patent/CN103688322B/zh
Publication of EP2549495A1 publication Critical patent/EP2549495A1/fr
Priority to US14/158,084 priority patent/US9761366B2/en
Application granted granted Critical
Publication of EP2549495B1 publication Critical patent/EP2549495B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01F27/08—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
    • H01F27/02—Casings
    • H01F27/025—Constructional details relating to 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
    • H01F27/322—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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • H01F2027/328—Dry-type transformer with encapsulated foil winding, e.g. windings coaxially arranged on core legs with spacers for cooling and with three phases

Definitions

  • the invention relates to a dry-type transformer for mobile applications, comprising a transformer core and at least one radially inner first and one radially outer second wound around a common winding axis and penetrated by the transformer core hollow cylindrical winding segment, which are nested and radially spaced from each other, so that between a hollow cylindrical Cooling channel is pronounced, wherein spacer elements are provided for spacing, which are arranged such that the cooling channel can be flowed through in the axial direction of a coolant.
  • line-based utility networks are available for the transmission of electrical energy. Depending on the electrical power to be transmitted, these have a nominal voltage of, for example, 380 kV, 110 kV or even 10 kV, with typically a mains frequency of 50 or 60 Hz being used.
  • a supply network for the supply of stationary loads is typically 3-phase, so there is a system with three supply lines available, in which the current and voltage in a symmetrical state at a phase shift of 120 ° to each other in terms of amount are equal.
  • Energy supply systems for mobile consumers are typically constructed in a single phase, ie the supply takes place via a single supply line, wherein the return line then takes place via the metallic rail.
  • the return line then takes place via the metallic rail.
  • two supply lines are usually provided due to the non-existent and usable as a return rail rail.
  • the network frequency in such applications at least in Europe 16 2/3 Hertz, in some cases, such as S-Bru also isolated DC voltage is used.
  • a dry-type transformer of the type mentioned at the outset is characterized in that the spacer elements are so shaped and arranged along the radial circumference of the cooling channel over its axial length that the proportional weight of the horizontal transformer lies against at least one contact surface of the at least one second winding segment can be removed without a deformation of the cooling or the scattering channel formed by this occurs.
  • an alternative cooling system is provided, which works without oil but preferably with air. Due to the lower heat capacity of air, a significantly enlarged contact surface of the transformer winding to the cooling medium is therefore provided according to the invention. Furthermore, an increased coolant throughput, for example by means of a blower, is advantageous.
  • cooling channels which are provided between the nested hollow-cylindrical winding segments. These serve on the one hand to influence the short-circuit impedance of the dry-type transformer according to the invention, and are therefore also to be regarded as a stray channel insofar as they are arranged between two galvanically separated winding segments. On the other hand, these serve to cool the transformer winding from the inside.
  • a coolant in particular air, to be forced to flow through these cooling channels. Air has the advantage that the heated air can be discharged directly to the environment without an additional heat exchanger.
  • additional cooling channels are optionally provided to increase the cooling surface, for example, between a plurality of series-connected winding segments, which form a lower or higher voltage winding.
  • the transformer lying, so that the winding axis of the windings thus extends in a horizontal plane.
  • a particularly flat and more planar construction of the transformer is achieved, which accommodates the available flat but rather large space in the underfloor area.
  • the spacing of the hollow-cylindrical winding segments is provided by spacer elements of insulating material, through which a support is provided in at least predominantly radial direction to the winding axis.
  • the installation of such a dry-type transformer according to the prior art is vertical. This has for one cooling reasons, namely that then along the winding axis extending cooling channels are then operated by natural cooling by ambient air flows from bottom to top through the cooling channels. On the other hand, this is also mechanical. In a vertical arrangement, the transformer is namely on the bottom of its transformer core, so its entire weight, for example, 500kg to 1000kg, can be removed directly on the support surface of the transformer core on the floor space.
  • the arranged on the legs of the transformer core windings are thus aligned vertically and thus exposed predominantly weight forces in the direction of the winding axis.
  • a force stress in the winding of a direction radially to the winding axis does not take place in a vertical orientation of the transformer.
  • the support elements of the cooling channels of a dry-type transformer of the prior art are also correspondingly not designed for such a radial force load. Nevertheless, it is provided according to the invention, the dry-type transformer lying on corresponding bearing surfaces of its windings can be arranged or at least storable. Even if a dry transformer in the underfloor area is mainly attached to the sides of its transformer core, so that actually its weight would not be removed through the windings, so its transformer core but with a length of for example 2m is so long that due to gravity, a deflection of the same takes place. Thus, even in this case, the winding according to the invention for receiving increased radial forces to be trained to counteract bending.
  • the respective windings are to be trained accordingly also for receiving radial force stresses. According to the invention, therefore, it is provided that the arrangement of spacer elements be compacted accordingly in critical areas for a specific arrangement position of the transformer so that the maximum compressive stress per base area of a spacer element is not exceeded, even in the horizontal position of the dry transformer.
  • a typical size of a transformer according to the invention with a two leg core has a length of, 1.5m - 2.5m, a height of 0.75m and a width of 1.5m.
  • the dry-type transformer according to the invention advantageously avoids the use of oil and nevertheless has suitable cooling possibilities. Furthermore, it is designed by its horizontal arrangement in flat construction, so that it can be easily integrated into the underfloor area of a locomotive or a wagon. By a selective reinforcement or compression of the spacer elements in the cooling channels, a corresponding stabilization of the winding (s) is carried out for a horizontal position of the transformer to remove the entire weight of the transformer down.
  • the at least one second winding segment has exactly one respective preferred contact surface, via which only the proportionate weight of the horizontal transformer can be removed, without a deformation of the cooling channels.
  • the dry-type transformer then has a specific lying preferred position.
  • the spacers are only for the preferred position to strengthen or compact, so that the cost of the reinforcement is reduced to a minimum.
  • the spacer elements are arranged compressed in the radial direction to the respective bearing surface, so that there is an increased radial compressive strength in the corresponding areas of the cooling channel. It is basically given material of the spacer elements, the possibility of this in the appropriate areas either in a smaller distance from each other, so compressed, to order, or even to increase the width or contact surfaces of the spacer elements accordingly.
  • the spacer elements are strip-like or channel-like and preferably extend along the winding axis.
  • the hollow cylindrical cooling channel is subdivided into a plurality of fluidically favorable running in the axial direction of the cooling channels. The cooling effect is thus improved and homogenized in an advantageous manner.
  • the spacer elements are pronounced as selective support elements.
  • This offers on the one hand manufacturing advantages, for example, in accordance with diagonal to the axial direction staggered arrangement of the selective support elements also improved cooling effect is achieved.
  • a punctiform support element has, for example, a circular floor plan, for example with a diameter of 4 cm, and a height of also 4 cm, depending on the desired shape of the scattering or the cooling channel.
  • a respective hollow-cylindrical third winding segment interleaved between the respective first and second winding segments is provided, wherein in each case a cooling channel is provided between the respective winding segments.
  • the at least one radially inner first and the at least one radially outer second winding segment is provided for undervoltage and the at least one radially middle third winding segment for high voltage.
  • the short-circuit impedance of the transformer is advantageously increased, which then leads to reduced short-circuit currents in case of failure.
  • the radially inner winding is provided for example for the supply of a train heating, while the radially outer winding is then provided for the supply of the drive.
  • the transformer core has exactly two legs around which in each case at least one first and one second winding segment are arranged.
  • the Zweischkelaus entry is particularly in consideration of the single-phase of a traction power supply network advantage.
  • the division of the respective lower and upper voltage windings on the two legs leads to an increased utilization of the available space and thus to a very compact design of the transformer according to the invention.
  • the latter is arranged in a housing enclosing it, which has an inlet opening and an outlet opening, wherein air baffles are provided within the housing, which are arranged such that coolant entering through the inlet opening along the respective nested winding segments is serpentine-like through the housing or the cooling channels or scattering channels formed in them is guided to the outlet opening.
  • the housing offers mechanical protection of the transformer, which is particularly advantageous in the case of the arrangement in the underfloor area. The guidance of the cooling air longitudinally through air baffles of defined channels preferably through the cooling or stray channels improves the cooling effect.
  • the inlet and outlet openings are on the same side of the transformer housing. This facilitates the maintenance-related inclusion or removal of such a transformer.
  • a blower is provided to force cooling air through the coil segments.
  • the housing and holding structures used therein, such as, for example, the pressing bars for the transformer core are manufactured in lightweight construction, for example made of aluminum.
  • the weight of the transformer is thereby reduced in an advantageous manner, which is particularly advantageous due to the intended mobile use of the transformer, for example in rail vehicles.
  • vibration damping and adapted to the shape of the respective bearing surfaces supporting elements are provided by which the dry transformer is supported on the support surfaces and / or fixed.
  • a homogeneous pressure load of the bearing surfaces is guaranteed. Due to the vibration damping properties of the support elements, both the natural oscillation of the transformer during operation, for example 16 2/3 Hz, as well as shocks due to the movement of a locomotive, for example, in which the transformer is integrated, are damped.
  • interleaved winding segments are cast together.
  • This increases the mechanical stability of the electrical part of the winding and advantageously increases the respective compressive strength.
  • An encapsulation or a solidification of the winding takes place for example by means of an epoxy resin.
  • a tape-like prepreg material can also be used as layer insulation between respective winding layers, which is introduced during winding of the windings.
  • the transformer winding is heated and the B-staged resin contained in the prepreg is completely polymerized, which then leads to mechanical stabilization of the respective windings.
  • respective first, respective second and / or respective third winding segments are galvanically connected to one another. This can be done both by means of a series connection and a parallel connection.
  • high voltage windings are connected in series to reduce the voltage stress and lower voltage windings for increasing the current carrying capacity in parallel.
  • a transformer according to the invention comprises a two-limb core each having two nested winding arrangements.
  • the at least one first and the at least one second winding segment are galvanically connected in series, so that an autotransformer is formed.
  • This optionally has several taps and is characterized by a particularly high power density.
  • Fig. 1 shows a section 10 through an exemplary hollow cylindrical cooling channel, wherein the radially inwardly and outwardly adjacent winding segments are not shown.
  • a hollow cylindrical cooling channel is formed, in which in the radial direction strip-like spacer elements 24, 26, 28 are arranged, which extend along the axis of the winding. These are made for example of a glass fiber reinforced composite material or pressboard. Between the spacer elements 24, 26, 28 thereby channels 16, 18, 20, 22 are formed along the axial extent, which are inventively provided as cooling channels for flowing through air.
  • the cooling channel is shown in its desired orientation, wherein in the lower region, the spacer elements 24, 26, 28 denser, ie with a smaller distance from each other, arranged are. Therefore, the compressive strength of the cooling channel is increased in its lower region such that the weight of a transformer or transformer core, not shown here, can be removed without deformation of the cooling channel or of the scattering channel formed by it.
  • Fig. 2 shows a first cut 30 by nested winding segments 32, 34, which in this case have an approximately rectangular cross-section.
  • a cross-sectional shape is advantageous for increasing the fill factor or for maximum utilization of the limited space available in the underfloor area of a railway car or a locomotive.
  • the radial spacing of the first 34 and second 32 winding segment is effected by strip-like spacer elements 40, 42, wherein between them respective cooling channels 36, 38 are formed.
  • the nested winding segments are shown in their desired orientation, ie lying, with a support surface 44 is indicated in the lower region. To increase the compressive strength of the nested winding segments in the radial direction to the support surface 44, the distribution of the spacer elements in the lower region is compressed accordingly.
  • Fig. 3 shows a second section through nested winding segments 54, 56, 58, which in this case have a circular cross-section. Between the winding segments 54, 56, 58 serving as cooling channels cooling channels 60, 62 are formed, wherein the measures provided for in these spacers are not shown in this illustration.
  • the radially inner first winding segment 54 encloses a transformer core leg 52 and, seen electrically, is a low-voltage winding, for example a 400V supply for a train heater.
  • the radially middle third winding segment represents a high-voltage winding, for example a 15 kV winding, which is fed by a catenary of a traction power supply.
  • the radially outer second winding 58 is a low-voltage winding and supplies, for example, the electric drive of a locomotive, not shown.
  • Fig. 4 shows a side sectional view 70 of an exemplary first dry-type transformer.
  • a two-leg transformer core 86 Arranged in an aluminum housing 72 is a two-leg transformer core 86, which is enclosed on each of its legs by respective arrays of nested winding segments 82, 84.
  • wedge-like and the shape of the outer contour bearing surfaces of the radially outer winding segments adapted supporting elements 78 are provided from a hard rubber material, over which the weight of the windings and the transformer core are proportionally removed down. These are in turn arranged on a respective intermediate element 76, for example an aluminum strip.
  • respective damping elements 88 similar in shape are provided, which enable a fixation of the windings 82, 84 or of the transformer in the housing 72, which of course do not serve for the removal of the weight.
  • An air guide plate 74 between the winding assemblies 82, 84 serves to form a respective guide channel for coolant, which extends along the winding segments.
  • the dimensions of the housing are, for example, 0.7m in height, 1.6m in width and 2.4m in length. Due to the horizontal arrangement, an arrangement in the underfloor area of a railway carriage is possible despite the increased space required by the cooling channels.
  • Fig. 5 shows a sectional view 90 of an exemplary second dry-type transformer. This corresponds essentially to that in the Fig. 4 shown, but is shown in a plan viewperpective.
  • a housing 112 Arranged in a housing 112 is a two-leg transformer core 92, which is enclosed on its two legs by nested hollow-cylindrical winding segments 94, 96.
  • the housing 112 has an inlet opening 98 and an outlet opening 100, wherein by means of air guide plates 106, 108, 110 a serpentine-like guidance of inflowing air 102 is ensured by the housing.
  • the introduced with a blower, not shown air heats up when flowing through the inner housing in the direction indicated by corresponding arrows and then exits at the outlet opening 100 as a heated air stream 104 again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Transformer Cooling (AREA)
EP11005855.9A 2011-07-18 2011-07-18 Transformateur à sec Active EP2549495B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ES11005855.9T ES2679821T3 (es) 2011-07-18 2011-07-18 Transformador seco
EP11005855.9A EP2549495B1 (fr) 2011-07-18 2011-07-18 Transformateur à sec
PCT/EP2012/002555 WO2013010611A1 (fr) 2011-07-18 2012-06-16 Transformateur de type sec
CN201280035579.4A CN103688322B (zh) 2011-07-18 2012-06-16 干式变压器
US14/158,084 US9761366B2 (en) 2011-07-18 2014-01-17 Dry-type transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11005855.9A EP2549495B1 (fr) 2011-07-18 2011-07-18 Transformateur à sec

Publications (2)

Publication Number Publication Date
EP2549495A1 true EP2549495A1 (fr) 2013-01-23
EP2549495B1 EP2549495B1 (fr) 2018-05-23

Family

ID=46331214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11005855.9A Active EP2549495B1 (fr) 2011-07-18 2011-07-18 Transformateur à sec

Country Status (5)

Country Link
US (1) US9761366B2 (fr)
EP (1) EP2549495B1 (fr)
CN (1) CN103688322B (fr)
ES (1) ES2679821T3 (fr)
WO (1) WO2013010611A1 (fr)

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* Cited by examiner, † Cited by third party
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CN104240929A (zh) * 2014-09-18 2014-12-24 江苏科兴电器有限公司 一种单相浇注式组合计量干式互感器
EP2827346A1 (fr) * 2013-07-17 2015-01-21 ABB Technology AG Bobine à transformateur sec et transformateur sec
EP3007189A1 (fr) * 2014-10-07 2016-04-13 ABB Technology AG Transformateur de véhicule
WO2018055202A1 (fr) * 2016-09-26 2018-03-29 Abb Schweiz Ag Transformateur
CN109346271A (zh) * 2018-11-14 2019-02-15 江苏思源赫兹互感器有限公司 一种升压变压器
EP3660874A1 (fr) * 2018-11-29 2020-06-03 ABB Schweiz AG Transformateur à sec
US20220230791A1 (en) * 2021-01-18 2022-07-21 Delta Electronics (Shanghai) Co., Ltd. Magnetic element

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JP6416504B2 (ja) * 2014-05-26 2018-10-31 東芝産業機器システム株式会社 モールド形静止誘導機器およびその製造方法
EP3343575B1 (fr) * 2016-12-28 2020-03-18 ABB Schweiz AG Compensateur de pression d'une installation sous-marine
DE102017102436B4 (de) 2017-02-08 2025-12-18 Hitachi Energy Ltd Trockentransformator mit Luftkühlung, Verfahren zur Kühlung und Verwendung eines Ring-Ventilators
US10832850B2 (en) * 2017-06-13 2020-11-10 Radyne Corporation Toroidal hand-held autotransformer assembly
CN110997556B (zh) * 2017-08-09 2023-06-13 东芝三菱电机产业系统株式会社 臭氧气体利用系统
EP3692556B1 (fr) * 2017-10-04 2021-10-20 ScandiNova Systems AB Agencement et transformateur comprenant l'agencement
CN108512168B (zh) * 2018-05-16 2019-11-22 江苏凯西电气设备科技有限公司 一种变压器母线防护装置
CN109616293B (zh) * 2018-12-29 2024-12-20 湖南福德电气有限公司 一种散热型电抗器
CN110124200B (zh) * 2019-04-01 2023-07-18 天津博雅信息科技有限公司 一种磁刺激线圈双面液冷装置
KR102077039B1 (ko) * 2020-01-07 2020-02-14 알앤알 주식회사 필 카펫의 스페이서 위치결정용 템플레이트
WO2022017609A1 (fr) * 2020-07-23 2022-01-27 Siemens Aktiengesellschaft Dispositif électrique à refroidissement direct forcé
CN113571296A (zh) * 2021-07-05 2021-10-29 广东中顺电气制造有限公司 一种干式变压器使用的通用气道绝缘板及其制造方法
CN116153634A (zh) * 2023-04-12 2023-05-23 特变电工智能电气有限责任公司 一种组合式110kV三相干式变压器

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EP1715495A2 (fr) * 2005-04-21 2006-10-25 TMC Italia S.p.A. Transformateur du type sec isolés par une résine
US20110063062A1 (en) * 2009-09-11 2011-03-17 Abb Technology Ag Disc wound transformer with improved cooling

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2827346A1 (fr) * 2013-07-17 2015-01-21 ABB Technology AG Bobine à transformateur sec et transformateur sec
WO2015007432A1 (fr) * 2013-07-17 2015-01-22 Abb Technology Ag Bobine de transformateur sec et transformateur sec
CN104240929A (zh) * 2014-09-18 2014-12-24 江苏科兴电器有限公司 一种单相浇注式组合计量干式互感器
US11062835B2 (en) 2014-10-07 2021-07-13 Abb Power Grids Switzerland Ag Vehicle transformer
EP3007189A1 (fr) * 2014-10-07 2016-04-13 ABB Technology AG Transformateur de véhicule
WO2016055235A1 (fr) * 2014-10-07 2016-04-14 Abb Technology Ag Transformateur de véhicule
RU2667081C1 (ru) * 2014-10-07 2018-09-14 Абб Швайц Аг Трансформатор транспортного средства
WO2018055202A1 (fr) * 2016-09-26 2018-03-29 Abb Schweiz Ag Transformateur
DE102016118149B4 (de) * 2016-09-26 2025-12-04 Hitachi Energy Ltd Transformator
CN109346271B (zh) * 2018-11-14 2024-02-23 江苏思源赫兹互感器有限公司 一种升压变压器
CN109346271A (zh) * 2018-11-14 2019-02-15 江苏思源赫兹互感器有限公司 一种升压变压器
WO2020108867A1 (fr) * 2018-11-29 2020-06-04 Abb Schweiz Ag Transformateur sec
EP3660874A1 (fr) * 2018-11-29 2020-06-03 ABB Schweiz AG Transformateur à sec
US12394562B2 (en) 2018-11-29 2025-08-19 Hitachi Energy Ltd Dry transformer
US20220230791A1 (en) * 2021-01-18 2022-07-21 Delta Electronics (Shanghai) Co., Ltd. Magnetic element
US12354787B2 (en) * 2021-01-18 2025-07-08 Delta Electronics (Shanghai) Co., Ltd. Magnetic element
US12488920B2 (en) 2021-01-18 2025-12-02 Delta Electronics (Shanghai) Co., Ltd. Magnetic element

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Publication number Publication date
US20140132381A1 (en) 2014-05-15
CN103688322B (zh) 2016-06-29
ES2679821T3 (es) 2018-08-31
WO2013010611A1 (fr) 2013-01-24
EP2549495B1 (fr) 2018-05-23
US9761366B2 (en) 2017-09-12
CN103688322A (zh) 2014-03-26

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