CN117809936A - Three-dimensional roll iron core dry-type transformer - Google Patents

Three-dimensional roll iron core dry-type transformer Download PDF

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Publication number
CN117809936A
CN117809936A CN202311850068.4A CN202311850068A CN117809936A CN 117809936 A CN117809936 A CN 117809936A CN 202311850068 A CN202311850068 A CN 202311850068A CN 117809936 A CN117809936 A CN 117809936A
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CN
China
Prior art keywords
wind
air
iron core
heat dissipation
dimensional
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Granted
Application number
CN202311850068.4A
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Chinese (zh)
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CN117809936B (en
Inventor
周苑良
李定煌
施易军
杨文良
廖庆敏
邱永刚
周文洲
曾焕泉
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Guangdong Kande Wei Electric Co ltd
Original Assignee
Guangdong Kande Wei Electric Co ltd
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Application filed by Guangdong Kande Wei Electric Co ltd filed Critical Guangdong Kande Wei Electric Co ltd
Priority to CN202311850068.4A priority Critical patent/CN117809936B/en
Publication of CN117809936A publication Critical patent/CN117809936A/en
Application granted granted Critical
Publication of CN117809936B publication Critical patent/CN117809936B/en
Active legal-status Critical Current
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/08Cooling; Ventilating
    • H01F27/085Cooling by ambient air
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/24Magnetic cores
    • H01F27/25Magnetic cores made from strips or ribbons

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

The invention relates to the technical field of transformers, in particular to a three-dimensional rolled iron core dry type transformer, which comprises: comprising the following steps: the three-dimensional roll iron core, the mounting bracket, the wind scooper and air supply mechanism, the wind scooper is equipped with wind guide opening and income wind gap, wind channel, vortex chamber, air outlet and heat dissipation space, wind guide opening and air outlet and heat dissipation space intercommunication, and the wind guide opening contracts gradually towards the direction in heat dissipation space, and the air outlet sets up towards heat dissipation space, and heat dissipation space is used for holding three-dimensional roll iron core and mounting bracket, and air supply mechanism provides the wind regime for the income wind gap. According to the three-dimensional coiled iron core dry-type transformer, the three-dimensional coiled iron core is arranged in the air guide cover, and the air guide opening of the air guide cover is matched with the air outlet, so that more air is guided to radiate the three-dimensional coiled iron core in the radiating space, the purpose of comprehensively and effectively radiating all surfaces of the three-dimensional coiled iron core is achieved, and the purpose of improving the radiating effect of the three-dimensional coiled iron core is achieved.

Description

Three-dimensional roll iron core dry-type transformer
Technical Field
The invention relates to the technical field of transformers, in particular to a three-dimensional wound core dry-type transformer.
Background
The transformer is a device for changing voltage, is basic equipment for power transmission and distribution, is usually installed outdoors, generates a large amount of heat inside when the transformer is used, accelerates the aging of insulating materials if the heat exceeds the temperature of an insulation system designed by the transformer, further directly influences the service life of the transformer, mainly utilizes a wind source to blow air into one side of the transformer to dissipate heat of the transformer, however, only can locally dissipate heat of the transformer in a mode of blowing air into one side of the transformer, is difficult to cover all surfaces of the transformer, and has the problem of poor heat dissipation effect on the surfaces of the transformer.
Disclosure of Invention
Accordingly, it is necessary to provide a three-dimensional wound core dry-type transformer, which has a technical problem that only partial heat dissipation of the transformer is possible by blowing air into one surface of the transformer, and the air hardly covers the entire surface of the transformer, and the heat dissipation effect of the surface of the transformer is poor.
A three-dimensional wound core dry-type transformer comprising: the three-dimensional roll iron core, mounting bracket, wind scooper and air supply mechanism, the three-dimensional roll iron core install in on the mounting bracket, the mounting bracket with the wind scooper is connected, the wind scooper is equipped with the wind gap and follows air flow direction and set gradually into wind gap, wind channel, vortex chamber, air outlet and heat dissipation space, the wind gap with the air outlet reaches heat dissipation space intercommunication, just the wind gap orientation heat dissipation space's direction contracts gradually, the air outlet orientation heat dissipation space sets up, heat dissipation space is used for holding the three-dimensional roll iron core with the mounting bracket, air supply mechanism is for the wind gap provides the wind regime.
Above-mentioned three-dimensional roll iron core dry-type transformer, provide the wind regime for the wind scooper through air supply mechanism, utilize wind scooper guide air to flow through into the wind gap in proper order, the wind channel, vortex chamber and air outlet, the air that flows through the vortex chamber accelerates, make the air after accelerating flow direction heat dissipation space from the air outlet through the guide of wind gap, because the wind gap contracts gradually towards heat dissipation space's direction, the air flows towards heat dissipation space under the direction of wind gap through the air outlet, the air flow that the air formed forms the coanda effect in wind gap department, with the heat on the three-dimensional roll iron core surface on the guide bracket is taken away through the air that flows, thereby realize carrying out comprehensive effectual heat dissipation to all surfaces of three-dimensional roll iron core. Through above-mentioned design, adopt to set up the iron core in the wind scooper with three-dimensional book, utilize the cooperation of wind scooper's wind gap and air outlet, do benefit to the guide more air and dispel the heat to the three-dimensional iron core of rolling up in the radiating space to make the comprehensive cover of air three-dimensional iron core of rolling up, and take away its surperficial heat, realize carrying out comprehensive effectual heat dissipation to all surperficial of three-dimensional iron core of rolling up, reach the purpose that promotes the radiating effect of three-dimensional iron core of rolling up.
In one embodiment, the wind scooper comprises a wind pipe, a wind guiding ring and a wind collecting cover, the wind pipe is connected with the air supply mechanism and is provided with the air inlet, the wind guiding ring is provided with the air duct and encloses the heat dissipation space, and the wind collecting cover is provided with the vortex cavity and the air outlet and encloses the air guiding opening.
In one embodiment, the wind guide ring is disposed around the stereoscopic coiled core and the mounting frame.
In one embodiment, the air guide cover further comprises a guide strip connected with the air guide ring, the guide strip is arranged on one surface of the air guide ring, which is close to the heat dissipation space, and the guide strip is spirally arranged along the air flow direction.
In one embodiment, the number of the air guide strips is multiple, and each air guide strip is arranged around one surface of the air guide ring, which is close to the heat dissipation space.
In one embodiment, the guide strip gradually contracts toward the three-dimensional coiled core.
In one embodiment, the air guiding strip is provided with an air guiding surface, and the air guiding surface is positioned at one end of the air guiding strip, which is close to the air outlet, and gradually inclines towards the air outlet.
In one embodiment, the wind scooper further includes a reinforcing block disposed within the wind tunnel.
In one embodiment, the wind collecting cover comprises a swirl part and an attaching part, the swirl part and the attaching part enclose the vortex cavity and the air outlet, and the attaching part is arranged in a horn shape to form the air guide opening.
In one embodiment, the flow rotating part comprises a connecting section, an arch section and a drainage section, wherein the connecting section is connected with the air guide ring, the arch section is connected with the drainage section, and the drainage section is obliquely arranged towards the direction of the heat dissipation space.
In one embodiment, the drainage segment gradually contracts toward the direction of the heat dissipation space.
In one embodiment, the attaching part comprises a switching section, a flow guiding section and a flow controlling section, the switching section is connected with the air guiding ring, the flow guiding section gradually contracts towards the direction of the heat dissipation space, the flow controlling section and the flow guiding section are surrounded into the air outlet at intervals, and the flow controlling section and the arch section are in interval form with the vortex cavity.
In one embodiment, the three-dimensional rolled iron core dry-type transformer further comprises a filter screen connected with the air guide cover, wherein the filter screen is connected with one end, close to the air guide opening, of the air guide cover, and the air guide opening is sealed.
Drawings
Fig. 1 is a schematic structural view of a three-dimensional wound core dry-type transformer according to the present invention;
fig. 2 is an exploded view of the three-dimensional wound core dry-type transformer shown in fig. 1;
fig. 3 is a bottom view of the three-dimensional wound core dry-type transformer shown in fig. 1;
fig. 4 is a schematic cross-sectional view of the three-dimensional wound core dry-type transformer shown in fig. 1;
fig. 5 is an enlarged schematic view of a portion a of the three-dimensional wound core dry-type transformer shown in fig. 4;
fig. 6 is a schematic cross-sectional view of a wind scooper of the three-dimensional wound core dry-type transformer shown in fig. 1.
The meaning of the reference numerals in the drawings are:
100. three-dimensional wound core dry-type transformers;
10. a three-dimensional coiled iron core;
20. a mounting frame;
30. a wind scooper; 301. an air guide port; 302. an air inlet; 303. an air duct; 304. a vortex chamber; 305. an air outlet; 306. a heat dissipation space; 31. an air duct; 32. an air guide ring; 33. a wind collecting hood; 331. a whirling part; 332. an attaching portion; 333. a connection section; 334. an arch segment; 335. a drainage section; 336. a transfer section; 337. a diversion section; 338. a flow control section; 34. a flow guiding strip; 341. an air guiding surface; 35. a reinforcing block;
40. and (3) a filter screen.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
As shown in fig. 1 to 3, a three-dimensional wound core dry-type transformer 100 according to the present invention includes: the three-dimensional roll iron core 10, the mounting bracket 20, the wind scooper 30 and air supply mechanism (not shown), wherein, the mounting bracket 20 is used for installing the three-dimensional roll iron core 10, the wind scooper 30 is used for covering the body roll iron core 10 and the mounting bracket 20, and guide air flow covers the three-dimensional roll iron core 10, the air supply mechanism is used for providing the wind source, the wind scooper 30 guides, through placing the three-dimensional roll iron core 10 in the wind scooper 30, the wind source provided by the guide air supply mechanism of the wind scooper 30 forms the air flow in a mode of covering the three-dimensional roll iron core 10, the comprehensive and effective heat dissipation is carried out on all surfaces of the three-dimensional roll iron core 10, and therefore the purpose of improving the heat dissipation effect of the three-dimensional roll iron core 10 is achieved.
Hereinafter, the above-mentioned three-dimensional wound core dry-type transformer 100 will be further described with reference to fig. 1 to 6.
As shown in fig. 2 and 3, the three-dimensional coiled iron core 10 is mounted on the mounting frame 20, the mounting frame 20 is connected with the air guide cover 30 to fix the position of the three-dimensional coiled iron core 10, the air guide cover 30 is provided with an air guide opening 301, an air inlet 302, an air duct 303, a vortex cavity 304, an air outlet 305 and a heat dissipation space 306 which are sequentially arranged along the air flow direction, the air guide opening 301 is communicated with the air outlet 305 and the heat dissipation space 306, the air guide opening 301 gradually contracts towards the direction of the heat dissipation space 306, the air outlet 305 is arranged towards the heat dissipation space 306, and the heat dissipation space 306 is used for accommodating the three-dimensional coiled iron core 10 and the mounting frame 20.
Specifically, as shown in fig. 2 to 4, the air guide cover 30 includes an air duct 31, an air guide ring 32 and an air collecting cover 33, the air duct 31 is connected with an air supply mechanism (not shown) and is provided with an air inlet 302, the air supply mechanism is a fan and provides an air source for the air inlet 302 of the air duct 31, the air guide ring 32 is arranged around the three-dimensional coiled iron core 10 and the mounting frame 20 and is connected with the mounting frame 20, the air guide ring 32 is provided with an air duct 303 and encloses a heat dissipation space 306, the air collecting cover 33 is provided with a vortex cavity 304 and an air outlet 305 and encloses an air guide 301.
More specifically, as shown in fig. 4 and 5, the wind collecting cover 33 includes a swirl portion 331 and an auxiliary surface portion 332, the swirl portion 331 and the auxiliary surface portion 332 enclose into a vortex cavity 304 and an air outlet 305, the auxiliary surface portion 332 is in a horn shape, and forms the air guide opening 301, wherein the swirl portion 331 includes a connection section 333, an arch section 334 and a drainage section 335, the connection section 333 is connected with the air guide ring 32, the arch section 334 is connected with the drainage section 335, the drainage section 335 is obliquely arranged towards the direction of the heat dissipation space 306, the drainage section 335 is gradually contracted towards the direction of the heat dissipation space 306, the auxiliary surface portion 332 includes a switching section 336, a flow guiding section 337 and a flow controlling section 338, the switching section 336 is connected with the air guide ring 32, the flow guiding section 337 is gradually contracted towards the direction of the heat dissipation space 306, the flow controlling section 338 and the flow guiding section 335 enclose into the air outlet 305 at intervals, the flow controlling section 338 and the arch section 334 form the vortex cavity 304 at intervals, after the air enters the vortex cavity 304, the air is blown out from the air outlet formed by the air guiding section 305 under the extrusion of the arch section 334 and the flow controlling section 338, the air flow guiding section 335 is gradually contracted towards the direction of the heat dissipation space 306, the air flow guiding section 337 is sucked from the air guide frame 10 at the periphery of the air guide ring 306, and the air guiding section 337 is located at the heat dissipation space 10, and the air guiding frame is located at the periphery of the heat dissipation space 306, and the air guiding frame is separated from the air guiding section 300.
Further, as shown in fig. 4 and 5, the air guide cover 30 further includes a guide strip 34 connected to the air guide ring 32, the guide strip 34 is disposed on a surface of the air guide ring 32 near the heat dissipation space 306, the guide strip 34 is disposed spirally along the air flow direction, wherein the guide strips 34 are plural, each guide strip 34 surrounds the air guide ring 32 near the surface of the heat dissipation space 306, specifically, the guide strip 34 gradually contracts toward the direction of the three-dimensional coiled iron core 10, the guide strip 34 has an air guide surface 341, the air guide surface 341 is located at one end of the guide strip 34 near the air outlet 305 and gradually inclines toward the direction of the air outlet 305, the guide strip 34 in a spiral shape is beneficial to guiding the air flow to blow to the three-dimensional coiled iron core 10 so as to uniformly dissipate the heat of the surface of the three-dimensional coiled iron core 10, and the guide of the guide strip 341 is beneficial to reduce the resistance of the guide strip 34 to the air flow, so that the influence of the guide strip 34 on the air flow velocity can be effectively reduced.
Further, as shown in fig. 5 and 6, the air guiding cover 30 further includes a reinforcing block 35, the reinforcing block 35 is disposed in the air duct 303 and connected with the air guiding ring 32, and the structural strength of the air guiding ring 32 can be improved by the reinforcing block 35, so as to improve the air guiding stability of the air guiding ring 32.
In order to reduce the influence of dust on the service life of the three-dimensional coiled iron core 10, as shown in fig. 1, 2 and 4, the three-dimensional coiled iron core dry-type transformer 100 further comprises a filter screen 40 connected with the air guide cover 30, wherein the filter screen 40 is connected with one end of the air guide cover 30 close to the air guide opening 301 and seals the air guide opening 301, dust and fine substances can be effectively reduced through the filter screen 40 and enter the heat dissipation space 306 through the air guide opening 301, so that dust is prevented from accumulating on the three-dimensional coiled iron core 10 in the heat dissipation space 306, and the influence of dust on the service life of the three-dimensional coiled iron core 10 is effectively reduced, so that the purpose of prolonging the service life of the three-dimensional coiled iron core 10 is achieved.
The working principle of the three-dimensional rolled iron core dry-type transformer 100 of the invention is as follows: the air supply mechanism provides a wind source for the air guide cover 30, the air guide cover 30 is utilized to guide air to sequentially flow through the air inlet 302, the air channel 303, the vortex cavity 304 and the air outlet 305, the air flowing through the vortex cavity 304 is accelerated, the accelerated air flows from the air outlet 305 to the heat dissipation space 306 through the guide of the air guide opening 301, the air gradually contracts towards the direction of the heat dissipation space 306 due to the fact that the air guide opening 301 gradually contracts towards the direction of the heat dissipation space 306, the air flows to the heat dissipation space 306 under the guide of the air guide opening 301 through the air outlet 305, the coanda effect is formed at the air guide opening 301, more air flows to the heat dissipation space 306, and the heat on the surface of the three-dimensional coiled iron core 10 on the mounting frame 20 is taken away through the flowing air, so that the overall and effective heat dissipation on all surfaces of the three-dimensional coiled iron core 10 is realized.
The three-dimensional rolled iron core dry-type transformer 100 has the beneficial effects that: the three-dimensional coiled iron core 10 is arranged in the air guide cover 30, and the air guide opening 301 of the air guide cover 30 is matched with the air outlet 305, so that more air is guided to radiate the three-dimensional coiled iron core 10 in the radiating space 306, the three-dimensional coiled iron core 10 is comprehensively covered by the air, the heat on the surface of the three-dimensional coiled iron core 10 is taken away, the comprehensive and effective radiation of all the surfaces of the three-dimensional coiled iron core 10 is realized, and the aim of improving the radiating effect of the three-dimensional coiled iron core 10 is fulfilled.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. A three-dimensional wound core dry-type transformer, comprising: the three-dimensional roll iron core, mounting bracket, wind scooper and air supply mechanism, the three-dimensional roll iron core install in on the mounting bracket, the mounting bracket with the wind scooper is connected, the wind scooper is equipped with the wind gap and follows air flow direction and set gradually into wind gap, wind channel, vortex chamber, air outlet and heat dissipation space, the wind gap with the air outlet reaches heat dissipation space intercommunication, just the wind gap orientation heat dissipation space's direction contracts gradually, the air outlet orientation heat dissipation space sets up, heat dissipation space is used for holding the three-dimensional roll iron core with the mounting bracket, air supply mechanism is for the wind gap provides the wind regime.
2. The three-dimensional rolled iron core dry-type transformer according to claim 1, wherein the wind scooper comprises a wind pipe, a wind guiding ring and a wind collecting cover, the wind pipe is connected with the air supply mechanism and is provided with the air inlet, the wind guiding ring is provided with the wind channel and encloses the heat dissipation space, and the wind collecting cover is provided with the vortex cavity and the air outlet and encloses the wind guiding opening.
3. The dry-type transformer of claim 2, wherein the air guide ring is disposed around the solid wound core and the mounting frame.
4. The dry-type transformer of claim 2, wherein the wind scooper further comprises a guide strip connected to the wind guiding ring, the guide strip is disposed on one surface of the wind guiding ring near the heat dissipation space, and the guide strip is disposed in a spiral shape along the air flowing direction.
5. The dry-type transformer of claim 4, wherein the number of the guide strips is plural, and each guide strip is disposed around one surface of the air guide ring near the heat dissipation space.
6. The dry-type transformer of claim 4, wherein the guide bars are gradually contracted toward the solid wound core.
7. The dry-type transformer of claim 4, wherein the air guide strip has an air guide surface, and the air guide surface is located at one end of the air guide strip near the air outlet and gradually inclines towards the air outlet.
8. The dry-type transformer of claim 2, wherein the wind scooper further comprises a reinforcing block disposed within the wind tunnel.
9. The dry-type transformer of claim 2, wherein the wind collecting cover comprises a rotating part and an attaching part, the rotating part and the attaching part enclose the vortex cavity and the air outlet, and the attaching part is arranged in a horn shape to form the air guide opening.
10. The dry-type transformer of claim 1 further comprising a filter screen connected to the air guide cover, wherein the filter screen is connected to an end of the air guide cover near the air guide opening and closes the air guide opening.
CN202311850068.4A 2023-12-28 2023-12-28 Three-dimensional roll iron core dry-type transformer Active CN117809936B (en)

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CN117809936B CN117809936B (en) 2024-07-23

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150107933A (en) * 2014-03-13 2015-09-24 에이피시스템 주식회사 A cooling device of electric transformer and method of cooling same
CN207183044U (en) * 2017-09-04 2018-04-03 呼和浩特市浩源电力科技有限公司 A kind of three-dimensional reel iron core transformer heat radiating installation construction
US20180254135A1 (en) * 2017-03-03 2018-09-06 Fanuc Corporation Reactor, motor driver, power conditioner, and machine
CN115023775A (en) * 2022-04-21 2022-09-06 海鸿电气有限公司 Novel dry-type transformer
CN217606660U (en) * 2022-04-14 2022-10-18 海鸿电气有限公司 Outdoor type three-dimensional wound core dry-type transformer
CN115376787A (en) * 2022-05-24 2022-11-22 海鸿电气有限公司 Outdoor dry-type transformer and control method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150107933A (en) * 2014-03-13 2015-09-24 에이피시스템 주식회사 A cooling device of electric transformer and method of cooling same
US20180254135A1 (en) * 2017-03-03 2018-09-06 Fanuc Corporation Reactor, motor driver, power conditioner, and machine
CN207183044U (en) * 2017-09-04 2018-04-03 呼和浩特市浩源电力科技有限公司 A kind of three-dimensional reel iron core transformer heat radiating installation construction
CN217606660U (en) * 2022-04-14 2022-10-18 海鸿电气有限公司 Outdoor type three-dimensional wound core dry-type transformer
CN115023775A (en) * 2022-04-21 2022-09-06 海鸿电气有限公司 Novel dry-type transformer
CN115376787A (en) * 2022-05-24 2022-11-22 海鸿电气有限公司 Outdoor dry-type transformer and control method thereof

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