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
  • H01F27/085—Cooling by ambient air

Definitions

• Example embodiments of the present disclosure generally relate to a cooling device and more particularly, to a cooling device for a transformer.
• Transformers are widely deployed in various applications to provide various functions, such as voltage conversion.
• a transformer may be provided in a substation of a power transmission system or a wind mill.
• some of the input power may not be transformed into desired electircal power.
• a part of energy may be transformed into heat, causing an increasing temperature of the transformer.
• the increased temperature may lead to several disadvantages.
• the transformer may age more rapidly, reducing its service life.
• Example embodiments of the present disclosure propose a solution of cooling a dry-type transformer.
• a cooling device for a transformer including a row of three coil devices.
• the cooling device comprises a first air fan and a first ventilation unit.
• the first air fan is arranged at a first side of a first coil device of the three coil devices.
• the first ventilation unit includes a first wing branch coupling to the first air fan and adapted to communicate air from the first air fan.
• the first wing branch is adapted to extend into bottom or top of a first gap between the first coil device and a second coil device.
• the first wing branch comprises a first set of openings adapted to communicate the air in the vertical direction.
• a transformer In a second aspect, it is provided a transformer.
• the transformer comprises a first coil device, a second coil device, a third coil device arranged in a row with the first and second coil devices, and a cooling device of the first aspect.
• a method for manufacturing a cooling device comprises providing a first air fan arranged at a first side of a first coil device, and providing a first ventilation unit including a first wing branch and coupled to the first air fan.
• the first ventilation unit is adapted to communicate air from the first air fan.
• the first wing branch is adapted to extend into bottom or top of a first gap between the first coil device and a second coil device.
• the first wing branch comprises a first set of openings adapted to communicate the air in the vertical direction.
• the converter according to embodiments of the present disclosure may achieve a desirable efficiency based on the proposed topology.
• Fig. 1 illustrates an internal structure of a dry-type transformer in accordance with some example embodiments of the present disclosure
• Fig. 2 illustrates a first part of a cooling device for a transformer in accordance with some example embodiments of the present disclosure
• Fig. 3 illustrates a ventilation unit of the cooling device of Fig. 2 in accordance with some example embodiments of the present disclosure
• Fig. 4 illustrates a wing branch of the ventilation unit of Fig. 3 in accordance with some example embodiments of the present disclosure.
• Fig. 5 illustrates an example of a method for manufacturing a cooling device in accordance with some example embodiments of the present disclosure.
• the term “comprises” or “includes” and its variants are to be read as open terms that mean “includes, but is not limited to. ”
• the term “or” is to be read as “and/or” unless the context clearly indicates otherwise.
• the term “based on” is to be read as “based at least in part on. ”
• the term “being operable to” is to mean a function, an action, a motion or a state can be achieved by an operation induced by a user or an external mechanism.
• the term “one embodiment” and “an embodiment” are to be read as “at least one embodiment. ”
• the term “another embodiment” is to be read as “at least one other embodiment. ”
• cooling effect of the conventional cooling device is not ideal, and can be further improved.
• fans are placed at the front and rear ends of each coil in a cooling device.
• For the high-voltage coil it is a complete hollow circle.
• the wing can be diffused into both sides to achieve better heat dissipation performance.
• For the low-voltage coil however, it has multiple vents of the same size due to cooling ducts, and each vent is isolated from the other. Therefore, the coil is poorly ventilated away from the draught fan, resulting in a high temperature at the left and right ends of the low-voltage coil.
• Fig. 1 illustrates an internal structure of a dry-type transformer 100 in accordance with some example embodiments of the present disclosure.
• the transformer 100 includes a row of three coil devices.
• the transformer 100 includes six fans located at the front and rear ends of the bases of the coil devices, as conventional transformers.
• the transformer 100 further includes a first cooling device 10 and a second cooling device (not shown) at the front and rear ends of the base or bottom of a first coil device 4, respectively.
• the first coil device 4 is located between a second coil device 2 and a third coil device 6.
• the first cooling device 10 has a configuration substantially the same as the second cooling device. Thus, only the first cooling device 10 will be described below for brevity.
• first and second cooling devices are illustrated at the front and rear ends of the base or bottom of the first coil device, this is only for illustration without suggesting any limitations as to the scope of the subject matter described here.
• the first and second cooling devices may be provided at the front and rear ends of the top of the first coil device.
• first cooling device may be provided at the top of the first coil device 4, and the second cooling device may be provided at the bottom of the first coil device 4.
• first and second cooling devices may be provided at the front and rear ends of the middle of the first coil device 4.
• the ventilation unit may extend to the top or bottom of the first coil device 4 to communicate air, or communicate air through slots at the middle of the first coil device 4.
• first and second cooling devices are illustrated to be separate cooling devices, this is only for illustration without suggesting any limitations as to the scope of the subject matter described here.
• the first and second cooling devices may be provided as a single cooling device.
• the heat tends to accumulate at the first and second gaps and the sides of the coil devices adjacent to the first and second gaps.
• circulated air is difficult to reach these areas, or at least difficult to remove the accumulated heat in time.
• Fig. 2 illustrates a first part of the cooling device 10 for a transformer in accordance with some example embodiments of the present disclosure.
• the first part of the cooling device 10 may be located at a front end of the first coil device 4.
• the cooling device 10 may further include a second part (not shown) of the cooling device 10 located at a rear end of the first coil device 4.
• the first part of the cooling device 10 may include a first support base 12, a first air fan 16, a first motor 14 for driving the first air fan 16, and a first ventilation unit 18.
• the first support base 12 supports the first air fan 16 and the first motor 14.
• the first air fan 16 is arranged at a first side of the first coil device 4. The first side may be the front side in an example.
• the ventilation unit 18 may include a first wing branch and a second wing branch.
• the first wing branch is coupled to the first air fan 16, and adapted to communicate air from the first air fan 16.
• the first wing branch may be a hollow structure in an example.
• the first wing branch may include a plurality of air channels arranged in parallel in another example.
• the first wing branch may employ other structures in other examples, as long as it can communicate air from the first air fan.
• the first wing branch is adapted to extend into bottom or top of a first gap between the first coil device 4 and the second coil device 2. As shown in Fig. 1, there is a first gap between the first coil device 4 and the second coil device 2.
• the first wing branch comprises a first set of openings adapted to communicate the air in the vertical direction, as will be described below.
• the first ventilation unit 18 may include a second wing branch spaced apart from the first wing branch.
• Fig. 2 illustrates a specific configuration of the first and second wing branches, this is only for illustration without suggesting any limitations as to the scope of the subject matter described here.
• the first ventilation unit 18 may has a “T” or a star shape.
• the air fan may provide air flow from a first end, and the air flow may flow out from the other two ends.
• the second wing branch is adapted to extend into bottom or top of a second gap between the first coil device 4 and the third coil device 6, and comprises a second set of openings adapted to communicate the air in the vertical direction.
• the second wing branch may have a structure similar to or the same as the first wing branch. In this event, details of the second wing branch will not be described for brevity.
• the second part may include a second air fan arranged at a second side of the first coil device 4 and a second ventilation unit.
• the second side is opposite to the first side of the first coil device 4.
• the second ventilation unit includes a third wing branch coupling to the second air fan, and adapted to communicate air from the second air fan.
• the third wing branch is adapted to extend into bottom or top of the first gap between the first coil device and the second coil device, and comprises a third set of openings adapted to communicate the air in the vertical direction.
• the second ventilation unit includes a fourth wing branch spaced apart from the third wing branch.
• the fourth wing branch is adapted to extend into bottom or top of the second gap between the first coil device 4 and the third coil device 6, and comprises a fourth set of openings adapted to communicate the air in a vertical direction.
• the second part may have a structure similar to or the same as the first part in the example. In this event, the second part will not be illustrated and described for brevity.
• Fig. 3 illustrates a ventilation unit 18 of the cooling device of Fig. 2 in accordance with some example embodiments of the present disclosure.
• the ventilation unit 18 may include the first wing branch 13 and the second wing branch spaced apart from the first wing branch 13.
• the cooling device 10 may include a first three-way valve 13 coupled between the first air fan 16 and the first ventilation unit 18, and a second three-way valve coupled between the second air fan and the second ventilation unit.
• the three-way valve is illustrated, this is only for illustration without suggesting any limitations as to the scope of the subject matter described here.
• the three-way valve may be omitted, and the ventilation unit may be directly coupled with the air fan 16.
• the first wing branch 13 may include a first subset of openings 15 adapted to communicate the air into channels inside one of the first, second and third coil devices, and a second subset of openings 17 adapted to communicate the air into channels inside another one of the first, second and third coil devices.
• the first subset of openings 15 may communicate the air into channels inside the first coil device 4
• the second subset of openings 17 may communicate the air into channels inside the second coil device 2.
• the first subset of openings 15 includes a first opening arranged to face a channel between a low voltage coil and an insulation barrier of one of the first, second and third coil devices, a second opening arranged to face a channel between the insulation barrier and a high voltage coil of the one of the first, second and third coil devices.
• the first or second subset of openings further includes a third opening arranged to face the low voltage coil of the one of the first, second and third coil devices.
• the first subset 15 may include a first opening arranged to face a channel between a low voltage coil and an insulation barrier of the first coil device 4, a second opening arranged to face a channel between the insulation barrier and a high voltage coil of the one of the first coil device 4, and a third opening arranged to face the low voltage coil of the first coil device 4.
• the second subset 17 may include a first opening arranged to face a channel between a low voltage coil and an insulation barrier of the second coil device 2, a second opening arranged to face a channel between the insulation barrier and a high voltage coil of the one of the second coil device 2, and a third opening arranged to face the low voltage coil of the second coil device 2.
• the subset may include one, two or more than three openings.
• the opening may have various different shapes in this example.
• the embodiment may provide significantly improved cooling effect due to the air flow through the channels between coils of a coil device. As such, the transformer may have a better performance and extend its service life.
• Fig. 4 illustrates the first wing branch 13 of the ventilation unit of Fig. 3 in accordance with some example embodiments of the present disclosure.
• the internal structure is illustrated with dotted lines
• the air flow inside the first wing branch 13 is illustrated with the dotted arrow.
• the first wing branch 13 includes a channel portion 31 coupled to one of the first and second air fans and an outlet portion coupled to the channel portion and between two of the three coil devices.
• the channel portion 31 is coupled to the first air fan, and the outlet portion is coupled to the channel portion 31 and between the first and second coil devices.
• the channel portion 31 is a hollow structure.
• the channel portion 31 may include a plurality of channels arranged in parallel.
• first and second chambers are formed in the outlet portion by a partition member 34.
• the first chamber may be the left chamber 32
• the second chamber may be the second chamber 33.
• the left chamber 32 is illustrated to have a step structure 36 with dotted lines.
• the step structure of the right chamber 33 is not illustrated, it is to be understood that the right chamber 33 has a step structure similar to that in the left chamber 32.
• only the air flows 22 are illustrated with dotted arrows to demonstrate that the air flows though the opening of the right chamber 33, it is to be understood that there are also air flows exiting from the openings at the left chamber 32.
• the at least one of the first, second, third and fourth sets of openings is arranged on the top of the outlet portion, and the step structure 36 is arranged on the bottom of the outlet portion.
• the first and second sets of the openings are arranged on the top of the outlet portion, and the step structure 36 is arranged on the bottom of the outlet portion.
• the air flow 21 from the air fan 16 flows inside the channel portion 31.
• the air flow 21 is then split into two streams when it passes by the partition member 34.
• the partition member 34 is arranged in the middle of the outlet portion to provide a first chamber 32 corresponding to one of subsets of openings of one of the first, second, third and fourth sets of openings and a second chamber 33 corresponding to another of subsets of openings of the one of the first, second, third and fourth sets of openings.
• the partition member 34 is illustrated in Fig. 4, this is this is only for illustration without suggesting any limitations as to the scope of the subject matter described here.
• the partition member may have a shape of a triangle with a corner facing toward the air flow, such that the air flow is forced along the two sides of the triangle into the two chambers of the outlet potion. In this case, with a reduce volume as compared to the situation of the flat partition member 34, the air flow may flow faster to provide a better cooling effect.
• the step structure 36 has two steps with a reduced thickness in a direction away from the channel portion 31.
• the air flow may have a faster flow speed exiting the openings, when it flows in the direction away from the channel portion 31.
• the transformer may have a better performance and extend its service life.
• the outlet portion may include a first arc side adapted to match a lateral side of the first coil device and a second art side adapted to match a later side of the second or third coil device.
• the outlet portion may include a first arc side adapted to match a lateral side of the first coil device 4 and a second art side 35 adapted to match a later side of the second coil device 2.
• Fig. 5 illustrates an example of a method for manufacturing a cooling device in accordance with some example embodiments of the present disclosure.
• a first air fan arranged at a first side of a first coil device.
• a first ventilation unit including a first wing branch and coupled to the first air fan, the first ventilation unit being adapted to communicate air from the first air fan.
• the first wing branch is adapted to extend into bottom or top of a first gap between the first coil device and a second coil device, and comprises a first set of openings adapted to communicate the air in the vertical direction.
• the cooling device for a transformer including a row of three coil devices.
• the cooling device comprises a first air fan and a first ventilation unit.
• the first air fan arranged at a first side of a first coil device of the three coil devices.
• the first ventilation unit includes a first wing branch coupling to the first air fan and adapted to communicate air from the first air fan.
• the first wing branch is adapted to extend into bottom or top of a first gap between the first coil device and a second coil device, and comprises a first set of openings adapted to communicate the air in the vertical direction.
• Item 2 The cooling device of Item 1, the first ventilation unit includes a second wing branch spaced apart from the first wing branch.
• the second wing branch is adapted to extend into bottom or top of a second gap between the first coil device and a third coil device, and comprises a second set of openings adapted to communicate the air in the vertical direction.
• Item 3 The cooling device of Item 1 or 2, further comprising a second air fan arranged at a second side of the first coil device, the second side being opposite to the first side of the first coil device, a second ventilation unit including a third wing branch coupling to the second air fan, and adapted to communicate air from the second air fan.
• the third wing branch is adapted to extend into bottom or top of the first gap between the first coil device and the second coil device, and comprises a third set of openings adapted to communicate the air in the vertical direction.
• Item 4 The cooling device of any of Items 1-3, the second ventilation unit includes a fourth wing branch spaced apart from the third wing branch.
• the fourth wing branch is adapted to extend into bottom or top of the second gap between the first coil device and the third coil device, and comprises a fourth set of openings adapted to communicate the air in a vertical direction.
• Item 5 The cooling device of any of Items 1-4, further comprising: a first three-way valve, coupled between the first air fan and the first ventilation unit; and a second three-way valve, coupled between the second air fan and the second ventilation unit.
• Item 6 The cooling device of any of Items 1-5, wherein at least one of the first, second, third and fourth sets of openings includes a first subset of openings adapted to communicate the air into channels inside one of the first, second and third coil devices and a second subset of openings adapted to communicate the air into channels inside another one of the first, second and third coil devices.
• Item 7 The cooling device of any of Items 1-6, wherein the first or second subset of openings includes a first opening arranged to face a channel between a low voltage coil and an insulation barrier of one of the first, second and third coil devices, a second opening arranged to face a channel between the insulation barrier and a high voltage coil of the one of the first, second and third coil devices.
• Item 8 The cooling device of any of Items 1-7, wherein the first or second subset of openings further includes a third opening arranged to face the low voltage coil of the one of the first, second and third coil devices.
• Item 9 The cooling device of any of Items 1-8, at least one of the first, second, third and fourth wing branches includes a step structure at a bottom side of the wing branch and opposite to the at least one of the first, second, third and fourth sets of openings.
• Item 10 The cooling device of any of Items 1-9, wherein the at least one of the first, second, third and fourth wing branches includes a channel portion coupled to one of the first and second air fans and an outlet portion coupled to the channel portion and between two of the three coil devices.
• the at least one of the first, second, third and fourth sets of openings is arranged on the top of the outlet portion, and the step structure is arranged on the bottom of the outlet portion.
• Item 11 The cooling device of any of Items 1-10, the outlet portion has a reduced thickness in a direction away from the channel portion.
• Item 12 The cooling device of any of Items 1-11, wherein the outlet portion includes an internal partition member arranged in the middle of the outlet portion to provide a first chamber corresponding to one of subsets of openings of one of the first, second, third and fourth sets of openings and a second chamber corresponding to another of subsets of openings of the one of the first, second, third and fourth sets of openings.
• Item 13 The cooling device of any of Items 1-12, wherein the outlet portion includes a first arc side adapted to match a lateral side of the first coil device and a second art side adapted to match a later side of the second or third coil device.
• Item 14 It is provided a transformer comprising a first coil device, a second coil device, a third coil device arranged in a row with the first and second coil devices and a cooling device of any of Items 1-13.
• Item 15 It is provided a method for manufacturing a cooling device.
• the method comprises providing a first air fan arranged at a first side of a first coil device, and providing a first ventilation unit including a first wing branch and coupled to the first air fan, the first ventilation unit being adapted to communicate air from the first air fan.
• the first wing branch is adapted to extend into bottom or top of a first gap between the first coil device and a second coil device, and comprises a first set of openings adapted to communicate the air in the vertical direction.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Transformer Cooling (AREA)

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• 2019
  • 2019-08-07 EP EP19940317.1A patent/EP4010911A4/de active Pending
  • 2019-08-07 CN CN201980099065.7A patent/CN114190107B/zh active Active
  • 2019-08-07 WO PCT/CN2019/099578 patent/WO2021022507A1/en not_active Ceased

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