EP3580770B1 - Trockentransformator mit luftkühlung - Google Patents

Trockentransformator mit luftkühlung Download PDF

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Publication number
EP3580770B1
EP3580770B1 EP18708595.6A EP18708595A EP3580770B1 EP 3580770 B1 EP3580770 B1 EP 3580770B1 EP 18708595 A EP18708595 A EP 18708595A EP 3580770 B1 EP3580770 B1 EP 3580770B1
Authority
EP
European Patent Office
Prior art keywords
ring
air
dry
cooling
type transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18708595.6A
Other languages
German (de)
English (en)
French (fr)
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EP3580770A1 (de
Inventor
Jens Tepper
Yong Wang
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.)
Hitachi Energy Ltd
Original Assignee
Hitachi Energy Switzerland AG
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Filing date
Publication date
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Publication of EP3580770A1 publication Critical patent/EP3580770A1/de
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Publication of EP3580770B1 publication Critical patent/EP3580770B1/de
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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
    • H01F27/2876—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
    • H01F27/08—Cooling; Ventilating
    • H01F27/085—Cooling by ambient air
    • 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
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers
    • 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 present disclosure relates to methods and devices for cooling dry-type transformers using ring fans, in particular dry-type transformers in non-ventilated housings with forced air cooling inside the housing.
  • the fan can be set up under the coils to blow the air into the cooling ducts.
  • air baffles can be placed in close proximity to the coils, thereby making the flow resistance of the cooling channels smaller than the flow resistance of the area outside the coils.
  • blowing the air into the coils requires a relatively powerful fan, with much of the air still flowing around the coils.
  • the air baffles must be individually adapted to the contours of the coils, which involves a considerable amount of work. Because the air guide plates also generate significant additional resistance, the ventilation system works with a lower overall efficiency. Overall, it is also true that with improved cooling with conventional fans, there is a lot of noise, especially from the rotating blades.
  • the JP 2015228442 A shows in Fig. 2 (a) and Fig. 5 (a) a plate perforated by individual holes. Against this background, there is a need for the present invention.
  • the object of the invention is achieved by an air-cooled dry-type transformer according to claim 1, and a method for cooling a dry-type transformer according to claim 7.
  • the cooling ducts described in this disclosure generally include all types of ducts that, according to aspects and embodiments, can be used or are suitable for conducting cooling air through a dry-type transformer. These can also be channels, for example, which are originally intended or are used for the purpose of dielectric insulation or for monitoring/controlling the field.
  • the dry type transformer includes a housing; and a heat exchanger configured to remove heat from the housing; wherein the flow of cooling air generated by the at least one ring fan, after passing through the cooling duct of the dry-type transformer, hits the heat exchanger and is cooled there.
  • the method includes providing a ring fan and a dry-type transformer, directing a flow of cooling air from the ring fan at a mating substantially annular opening of a cooling duct of the dry-type transformer.
  • the ring fan is proposed for cooling the dry-type transformer, with a directed, essentially ring-shaped cooling air flow of a ring fan being directed onto a matching opening of a cooling channel of the dry-type transformer.
  • a ring fan as used in this disclosure includes an annular housing from which an annular flow of air emanates in the axial direction of the ring. In the center of the housing is a central opening through which, in exemplary embodiments, one leg of the transformer core passes or is located.
  • the term "ring fan" is to be considered as corresponding to the previous definition, thereby including the variants described below.
  • a ring fan can have a ring-shaped housing as a stator, with a likewise ring-shaped runner in it, on which blades are attached, which are visible to the outside like in a conventional fan.
  • the ring fan can be a bladeless fan in exemplary embodiments.
  • a bladeless fan blows the air out of a ring without directly involving rotating rotor blades, or they are typically encapsulated in a separate housing.
  • the air is drawn in by an internally installed rotor in the base or on the side of the bladeless fan through holes in it, and guided into a circumferential cavity of a ring.
  • the air is then accelerated through a slit, which is preferably provided on an inner side of the ring.
  • the core of the transformer is vertical in relation to the earth's surface. This is favorable in terms of flow technology, since the air flow generated by the fan is supported or intensified by the convection of the heated air.
  • the core can also have other orientations, for example horizontally to the earth's surface, so that the cooling air flow also flows horizontally.
  • cores or legs are positioned vertically, as is customary in technical terms.
  • Exemplary embodiments relate in particular to the following cases:
  • the transformer is typically cooled by an air flow directed from below upwards, which is generated by a ring or bladeless fan arranged in the lower region of the windings or directly under the windings.
  • the bottom-up air flow can be generated by a ring or bladeless fan located in the top portion of the coils.
  • the airflow can flow through both the lower and the upper area of the windings arranged ring or bladeless fans can be created, i.e. by a combination of the above two cases.
  • a fan can also be installed (in addition to the variants described above, or individually) between the upper coil or winding and the lower coil or winding.
  • the above variants can be made individually for each leg, or a single fan can be used with a ring, where the ring is not round but elongated and all three windings are on the covering three legs.
  • Embodiments have the following advantages over conventional ventilation techniques with conventional fans.
  • the air baffle plates described at the beginning and their holding device or connections can be omitted completely.
  • cooled air can be routed directly to the fan through a pipe and then blown into the cooling channels. This avoids unnecessary heat exchange between the cooling air and the environment outside the windings. Therefore, the cooled air in the inlet duct to the ringless fan stays cool. A large part of the air accelerated by the fan flows directly into and through the cooling channels in the windings, while at the same time this is achieved with little or reduced structural effort.
  • the bladeless fans in particular operate with a low noise level due to the absence of open rotating blades as in a conventional fan or blower.
  • FIG. 1 12 shows an air-cooled dry-type transformer 1 according to embodiments in cross section.
  • This comprises a core 10 with a leg 11 and a winding body 14 arranged around the core 10 or around the leg 11.
  • the winding body 14 can have a plurality of windings or winding parts.
  • a cooling channel 25 is located between an inner part 15 of the winding body 14 and an outer part 20 of the winding body 14. This has two openings 40, 42 at its two ends, typically at the bottom and at the top when the core 10 or leg 11 is vertical 25 has a substantially annular cross-section.
  • a top plan view is shown with the ring 32 shown in black.
  • the dry-type transformer 1 can also have several legs 11, for example two or three.
  • a ring fan 30a arranged under the dry-type transformer 1 comprises a ring 32 and a blower 34 (see also 3 ).
  • the blower 34 is configured to draw in air from the environment (eg, in embodiments, the air may be supplied through a tube) and blow the air out of a slot 33 in the ring 32 in a directed manner along a longitudinal axis of the ring 32 .
  • a flow of cooling air 35 is generated in the process.
  • the ring fan 30 is dimensioned and arranged in such a way that it generates an annular flow of cooling air 35 which geometrically matches the dimensions of the cooling channel 25 .
  • the cooling air flow 35 essentially corresponds in its cross-sectional profile and in its dimensions to the cross-sectional profile and the dimensions of one of the openings 40, 42, i.e. typically also the dimensions of the cooling air duct 25.
  • the cooling duct 25 typically has an inner cooling duct diameter d1 and an outer cooling duct -Diameter d2 on. These are essentially identical to the inner air flow diameter dks1 and the outer air flow diameter dks2 of the cooling air flow 31.
  • FIG. 2 an exemplary embodiment is shown in which a ring fan 30b is arranged above the winding body 14 . That is, the cooling air flow 35 is generated by sucking the air out of the cooling air duct 25 .
  • In 3 1 shows an exemplary, non-limiting example of a ring fan 30, 30a, 30b in the form of a bladeless fan.
  • the flow of cooling air 35 blown out of the slot 33 in the ring 32 is represented symbolically by arrows.
  • the supply of the cooling air to the blower 34 is shown on the right-hand side.
  • the flow of cooling air is routed through a pipe or duct to the fan 34 .
  • the ring or bladeless fan is not arranged on or around the core 10 as in the other examples, but is arranged outside and above the dry-type transformer 1 and the core 10 is.
  • the fan can be attached, for example, to the top or ceiling of a housing, i.e. without direct contact with the transformer 1 itself.
  • FIG 5 is a dry-type transformer 1 shown according to embodiments, which is a combination of the variants from the 1 and 2 represents.
  • the windings on the core or legs are divided here, so that another ring or bladeless fan 30c is arranged between the winding segments 70, 75. That is, the fan 30c is arranged between two winding segments 70, 75 arranged separately in the longitudinal direction of the core 10.
  • the winding segments 70 he works in the blowing mode, for the other winding segment 75 in the suction mode.
  • only the center ringless fan 30c may be used with such a transformer configuration.
  • FIG. 6 shows a transformer cooling system 100, with a dry transformer 1 according to one of the embodiments described above.
  • the dry-type transformer 1 is located in a (substantially or completely closed) housing 50.
  • the cooling air of the cooling air flow 35 is guided into a heat exchanger 60 after passing through the cooling duct 25. This is used to dissipate the waste heat from the housing 100, for example to the ambient air, or to a cooling circuit with a fluid such as water.
  • the cooling air flow 35 heated by the dry-type transformer 1 is thus guided into the heat exchanger 60 and cooled there.
  • the cooled air flow is then drawn back through the blower 34 of the (or more) ring or bladeless fan 30a via a tube 36 . This creates a closed cooling air circuit.
  • FIG. 7 shows from below a dry-type transformer 1 with three legs 11, such as a three-phase transformer.
  • a dry-type transformer 1 with three legs 11, such as a three-phase transformer.
  • only one bladeless fan 30d is used, the ring 32b of which is designed to be elongated or elongated in order to cover all three winding bodies 14.
  • one or more separate fans can also be provided for each leg 11 or winding body 14, such as in the example 1 and figure 5 described.
  • the ring or bladeless fans 30, 30a, 30b, 30c described here can be used according to exemplary embodiments for cooling all types of dry-type transformers.
  • the ring 32a of the bladeless fan which is elongate or elongate here, can also assume shapes other than circular, e.g. elliptical, square or rectangular.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)
  • Motor Or Generator Cooling System (AREA)
EP18708595.6A 2017-02-08 2018-02-08 Trockentransformator mit luftkühlung Active EP3580770B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017102436.0A DE102017102436B4 (de) 2017-02-08 2017-02-08 Trockentransformator mit Luftkühlung, Verfahren zur Kühlung und Verwendung eines Ring-Ventilators
PCT/EP2018/053180 WO2018146196A1 (de) 2017-02-08 2018-02-08 Trockentransformator mit luftkühlung

Publications (2)

Publication Number Publication Date
EP3580770A1 EP3580770A1 (de) 2019-12-18
EP3580770B1 true EP3580770B1 (de) 2023-04-12

Family

ID=61563343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18708595.6A Active EP3580770B1 (de) 2017-02-08 2018-02-08 Trockentransformator mit luftkühlung

Country Status (9)

Country Link
US (1) US12014856B2 (pl)
EP (1) EP3580770B1 (pl)
KR (1) KR102518571B1 (pl)
CN (2) CN110249397A (pl)
DE (1) DE102017102436B4 (pl)
DK (1) DK3580770T3 (pl)
ES (1) ES2946190T3 (pl)
PL (1) PL3580770T3 (pl)
WO (1) WO2018146196A1 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4489038A1 (en) * 2023-07-04 2025-01-08 Hitachi Energy Ltd Transformer arrangement having an air duct element, air duct element, and cooling system for cooling a transformer

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CN113287178A (zh) * 2018-11-29 2021-08-20 Abb电网瑞士股份公司 变压器冷却系统和变压器安装装置
EP3770929A1 (en) * 2019-07-26 2021-01-27 ABB Power Grids Switzerland AG Transformer cooling system
US11842837B2 (en) * 2021-01-15 2023-12-12 Zhongbian Group Shanghai Transformer Co., Ltd. Dry-type transformer with elliptical iron core
JP2022118358A (ja) * 2021-02-02 2022-08-15 株式会社日立産機システム 変圧器
EP4145079A1 (en) * 2021-09-06 2023-03-08 Hitachi Energy Switzerland AG Cooling arrangement and method for cooling at least one oil-to-air external heat exchanger
SE545022C2 (en) 2021-10-01 2023-02-28 Bombardier Transp Gmbh Converter system with improved cooling of magnetic components and a railway vehicle
CN114141478B (zh) * 2021-11-04 2022-09-27 汇网电气有限公司 一种智能干式电力变压器
CN114300224B (zh) * 2021-12-11 2024-07-09 徐州鑫贝克电力设备股份有限公司 一种干式防雷电力变压器
CN114203397B (zh) * 2021-12-18 2025-01-07 陈琳 一种直流换流变压器
EP4376033A1 (en) * 2022-11-22 2024-05-29 Hitachi Energy Ltd Cooling arrangement and method for cooling at least one oil-to-air external heat exchanger
EP4418286A1 (en) * 2023-02-17 2024-08-21 Hitachi Energy Ltd A cooling arrangement for cooling a transformer

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EP2290662A1 (de) * 2009-09-01 2011-03-02 ABB Technology AG Trockentransformator
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP4489038A1 (en) * 2023-07-04 2025-01-08 Hitachi Energy Ltd Transformer arrangement having an air duct element, air duct element, and cooling system for cooling a transformer

Also Published As

Publication number Publication date
US20190362879A1 (en) 2019-11-28
PL3580770T3 (pl) 2023-08-14
WO2018146196A1 (de) 2018-08-16
CN110249397A (zh) 2019-09-17
KR102518571B1 (ko) 2023-04-05
US12014856B2 (en) 2024-06-18
KR20190112061A (ko) 2019-10-02
DE102017102436B4 (de) 2025-12-18
CN117766264A (zh) 2024-03-26
DK3580770T3 (da) 2023-07-24
ES2946190T3 (es) 2023-07-13
DE102017102436A1 (de) 2018-08-09
EP3580770A1 (de) 2019-12-18

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