TRANSFORMER WITH AIR GUIDING PLATES

• US 20190326050A1
• Filed: 07/03/2019
• Published: 10/24/2019
• Est. Priority Date: 03/24/2017
• Status: Active Grant

• Current Assignee: Hitachi Energy Limited
• Original Assignee: ABB Schweiz AG (ABB Limited)
• Inventors: Xu, Ye, Wang, Yong, Lu, Qiongfang, Li, Wenhao
• Granted Patent: US 11,049,645 B2
• Time in Patent Office: Days
• CPC Class Codes: H01F 2027/328 Dry-type transformer with encapsulated foil winding, e.g. windings coaxially arranged on core legs with spacers for cooling and with three phases
• CPC Class Codes: H01F 27/085 Cooling by ambient air
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 27/2876 Cooling cooling transformers and inductances in general H01F27/08
• CPC Class Codes: H01F 27/323 Insulation between winding turns, between winding layers
• CPC Class Codes: H01F 27/324 Insulation between coil and core, between different winding sections, around the coil; Other insulation structures

Abstract

A transformer is disclosed. The transformer includes a first coil including a first stack of wire disks stacked in a first direction; an exterior barrier arranged to form a first air gap between outer sides of the wire disks of the first stack of wire disks and the exterior barrier; an interior barrier arranged to form a second air gap between inner sides of the wire disks of the first stack of wire disks and the interior barrier; a wind generator arranged to generate an air flow in the first direction; a core in the form of a cylinder that is surrounded by the first coil; and an air guiding plate fixed to one of the exterior barrier and the interior barrier, to guide the air flow in a second direction along first stack gaps between the wire disks of the first stack of wire disks. The transformer effectively improves the heat dissipation of the coil and thus allows a smaller transformer in size.

Claims

1. A transformer, comprising:

a first coil including a first stack of wire disks stacked in a first direction;

an exterior barrier arranged to form a first air gap between outer sides of the wire disks of the first stack of wire disks and the exterior barrier;

an interior barrier arranged to form a second air gap between inner sides of the wire disks of the first stack of wire disks and the interior barrier;

a wind generator arranged to generate an air flow in the first direction;

a core in the form of a cylinder that is surrounded by the first coil; and

an air guiding plate fixed to one of the exterior barrier and the interior barrier, to guide the air flow in a second direction along first stack gaps between the wire disks of the first stack of wire disks.

2. The transformer according to claim 1, wherein the air guiding plate includes a first air guiding plate fixed to the exterior barrier and a second air guiding plate fixed to the interior barrier.

3. The transformer according to claim 2, wherein the first direction is a vertical direction, and the first air guiding plate and the second air guiding plate are at different altitudes.

4. The transformer according to claim 3, wherein the core is arranged to be coaxial with the first coil, the exterior barrier and the interior barrier.

5. The transformer according to claim 4, wherein the first air guiding plate is in the form of a closed ring to be circumferentially fixed to the exterior barrier, and the second air guiding plate is in the form of a closed ring to which the interior barrier is circumferentially fixed.

6. The transformer according to claim 1, wherein the air guiding plate protrudes into at least one of the first stack gaps.

7. The transformer according to claim 1, wherein the first direction is angled with respect to the second direction by an angle between 80 to 100 degrees.

8. The transformer according to claim 1, wherein the wind generator is arranged to generate the air flow upwardly.

9. The transformer according to claim 1, further comprising:

a second coil including a second stack of wire disks stacked in the first direction,

wherein the second coil is arranged between the core and the interior barrier

wherein a third air gap is formed between the interior barrier and outer sides of the wire disks of the second stack of wire disks, and

wherein a fourth air gap is formed between the core and inner sides of the wire disks of the second stack of wire disks.

10. The transformer according to claim 9, wherein the wire disks of the second stack of wire disks are arranged to be in parallel with the wire disks of the first stack of wire disks.

11. The transformer according to claim 10, further comprising:

a third air guiding plate fixed to the interior barrier; and

a fourth air guiding plate fixed to a barrier of the core

wherein both of the third air guiding plate and the fourth air guiding plate protrude into at least one of second stack gaps between the wire disks of the second stack of wire disks, to guide the air flow in the second direction along the second stack gaps.

12. The transformer according to claim 11, wherein the second coil surrounds the core and is arranged to be coaxial with the core and the interior barrier.

13. The transformer according to claim 12, wherein the third air guiding plate is in the form of a closed ring to be circumferentially fixed to the interior barrier, and the fourth air guiding plate is in the form of a closed ring to which the barrier of the core is circumferentially fixed.

14. The transformer according to claim 13, wherein the third air guiding plate and the fourth air guiding plate protrude into at least one of the second stack gaps.

15. The transformer according to claim 1, further comprising a second coil including a second stack of wire disks stacked in the first direction;

a third air guiding plate fixed to the interior barrier; and

a fourth air guiding plate fixed to a barrier of the core,

wherein the air guiding plate includes a first air guiding plate fixed to the exterior barrier and a second air guiding plate fixed to the interior barrier,

wherein the first direction is a vertical direction, and the first air guiding plate and the second air guiding plate are at different altitudes,

wherein the first air guiding plate is in the form of a closed ring to be circumferentially fixed to the exterior barrier, and the second air guiding plate is in the form of a closed ring to which the interior barrier is circumferentially fixed,

wherein the air guiding plate protrudes into at least one of the first stack gaps,

wherein the first direction is angled with respect to the second direction by an angle between 85 to 95 degrees,

wherein the wind generator is arranged to generate the air flow upwardly,

wherein the second coil is arranged between the core and the interior barrier,

wherein a third air gap is formed between the interior barrier and outer sides of the wire disks of the second stack of wire disks,

wherein a fourth air gap is formed between the core and inner sides of the wire disks of the second stack of wire disks,

wherein the wire disks of the second stack of wire disks are arranged to be in parallel with the wire disks of the first stack of wire disks

wherein both of the third air guiding plate and the fourth air guiding plate protrude into at least one of second stack gaps between the wire disks of the second stack of wire disks, to guide the air flow in the second direction along the second stack gaps,

wherein the core and is arranged to be coaxial with the first coil, the second coil, the exterior barrier and the interior barrier,

wherein the third air guiding plate is in the form of a closed ring to be circumferentially fixed to the interior barrier, and the fourth air guiding plate is in the form of a closed ring to which the barrier of the core is circumferentially fixed, and

wherein the third air guiding plate and the fourth air guiding plate protrude into at least one of the second stack gaps.

16. The transformer according to claim 2, further comprising:

a second coil including a second stack of wire disks stacked in the first direction,

wherein the second coil is arranged between the core and the interior barrier,

wherein a third air gap is formed between the interior barrier and outer sides of the wire disks of the second stack of wire disks, and

wherein a fourth air gap is formed between the core and inner sides of the wire disks of the second stack of wire disks.

17. The transformer according to claim 4, wherein the first direction is angled with respect to the second direction by an angle between 80 to 100 degrees.

18. The transformer according to claim 2, wherein the wind generator is arranged to generate the air flow upwardly.

19. The transformer according to claim 5, further comprising:

a second coil including a second stack of wire disks stacked in the first direction,

wherein the second coil is arranged between the core and the interior barrier,

wherein a third air gap is formed between the interior barrier and outer sides of the wire disks of the second stack of wire disks,

wherein a fourth air gap is formed between the core and inner sides of the wire disks of the second stack of wire disks, and

wherein the first direction is angled with respect to the second direction by an angle between 80 to 100 degrees.

20. The transformer according to claim 4, wherein the air guiding plate protrudes into at least one of the first stack gaps,

wherein the first direction is angled with respect to the second direction by an angle between 80 to 100 degrees.