JPH11273966A - Device for cooling transformer coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the heated fluid from creeping to the upper part of a coil and furthermore prevent increase in the temperature of the coil so as to make the coil compact. SOLUTION: This device is provided with an insulating inner cylinder 6 inside a transformer coil 3, an insulating lower cylinder 8 of almost lower half outside the coil 3, a coil retaining plate 12 for retaining the coil 3 via a shield 4 above the coil 3, a horizontal annular barrier 14 placed between a dust spacer 13 beneath the retaining plate 12 and upper shield 4, an insulative upper cylinder 16 provided above the lower cylinder 8 via a horizontal flow passage 15, and an insulating outer cylinder 18 whose upper end is connected with the outer peripheral part under the horizontal barrier 14 and which is provided outside the upper cylinder 16 and lower cylinder 8 via a vertical flow route 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer coil cooling device for cooling a transformer coil with an insulating cooling fluid such as insulating gas or insulating oil.

[0002]

2. Description of the Related Art A conventional cooling apparatus of this type will be described with reference to FIG. In the figure, 1 is a coil receiver at the bottom of the container,
2 is a duct spacer formed on the upper surface of the coil receiver 1,
Numeral 3 denotes a transformer coil located above the coil receiver 1, in which unit windings wound in the form of disks are vertically stacked, and a coil 3 is provided between adjacent unit windings by a horizontal duct spacer.
A horizontal duct (not shown) communicating with the inner surface and the outer surface is formed. Reference numeral 4 denotes an annular shield provided on the upper and lower end faces of the coil 3, and a duct is formed between the shield and the end face of the coil 3. Reference numeral 5 denotes a cylindrical shield ring connected to the shield 4.

[0006] Reference numeral 6 denotes an insulating inner cylinder, which is provided inside the coil 3 via an inner duct 7 in the vertical direction. 8
Is an insulating lower cylinder, which is provided on a substantially lower half outside the coil 3 through a vertical outer duct 9. 1
Reference numeral 0 denotes an annular inner barrier provided outside the inner cylinder 6, and an outer duct 9 is formed between the outer peripheral surface of the inner barrier 10 and the lower cylinder 8. Reference numeral 11 denotes an annular outer barrier provided inside the lower cylinder 8, and an inner duct 7 is formed between the inner peripheral surface of the outer barrier 11 and the inner cylinder 6.

[0004] Reference numeral 12 denotes a coil holding plate, and 13 denotes a duct spacer formed on the lower surface of the holding plate 12, and the holding plate 12 holds the coil 3 via the duct spacer 13, the shield ring 5, and the shield 4.

[0005] Heating by energizing the coil 3 causes an insulating cooling fluid such as insulating gas or insulating oil to pass from the periphery of the coil receiver 1 through the duct formed by the duct spacer 2 to the outside of the lower shield ring 5. And flow into the inside,
The fluid passes through the horizontal duct between the unit windings of the coil 3, and rises in a zigzag manner between the inside and outside of the coil 3 by the outer barrier 11 and the inner barrier 10. The fluid flows out through the duct formed by the duct spacer 13 and is cooled by the fluid.

[0006]

In the case of the conventional cooling device, the heated fluid flowing out of the coil presser plate 12 wraps around the coil 3 from outside the upper portion of the coil 3 and flows in. The upper portion of the coil 3 cannot be sufficiently cooled, and the current density of the electric wire of the coil 3 needs to be reduced, which causes a problem that the coil 3 becomes large.

In view of the above, the present invention prevents the heated fluid flowing out of the coil holding plate from flowing around the upper portion of the coil, prevents the coil temperature from rising, and reduces the size of the coil. It is an object of the present invention to provide a transformer coil cooling device.

[0008]

In order to solve the above-mentioned problems, a cooling device for a transformer coil according to the present invention comprises a transformer coil in which unit windings wound on a disk are vertically stacked through a horizontal duct. An insulating inner cylinder provided on the inner side of the coil via an inner duct, an insulating lower cylinder provided on an outer lower duct substantially on a lower half of the coil via an outer duct, and an outer side of the inner cylinder. An inner barrier and an outer barrier that are provided inside the lower cylinder and guide the upward flow of the cooling fluid in a zigzag manner, annular shields provided on the upper and lower end surfaces of the coil, A coil presser plate for pressing the coil via a shield, a duct spacer formed on the lower surface of the presser plate to guide the fluid from inside to outside, and a ring provided between the spacer and the upper shield A horizontal barrier, an insulative upper cylinder provided above the lower cylinder via a horizontal flow passage, and an upper end connected to an outer peripheral portion of a lower surface of the horizontal barrier, and vertically flowing outside the upper cylinder and the lower cylinder. And an insulating outer cylinder provided via a road.

Therefore, the heated fluid flowing out from the duct on the lower surface of the coil presser plate does not flow into the upper portion of the coil as in the prior art because it is blocked by the outer cylinder, and
Cooled fluid in the lower part outside the coil also flows from between the lower cylinder and the outer cylinder, passes through the vertical flow path between the lower cylinder and the outer cylinder, and cross-flows between the lower cylinder and the upper cylinder. And flows into the upper part of the coil to sufficiently cool the upper part of the coil where the temperature rises sharply. Therefore, the current density of the electric wire of the coil can be increased, and the coil can be downsized.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. 2, the same reference numerals as those in FIG. 2 denote the same or corresponding components, and the following points are added.

Between the duct spacer 13 on the lower surface of the coil holding plate 12 and the shield ring 5 of the upper shield 4, an annular horizontal barrier 14 is formed to extend outward from the shield ring 5.
And an insulating upper cylinder 16 is provided above the lower cylinder 8 via a horizontal flow passage 15, and an upper end of the upper cylinder 16 is connected to a lower surface of the horizontal barrier 14.
An insulating outer cylinder 18 is provided outside the lower cylinder 8 via a vertical flow passage 17, and the upper end of the outer cylinder 18 is
4 is connected to the periphery of the lower surface.

Therefore, the heated fluid flowing outward from the duct formed by the duct spacer 13 on the lower surface of the coil presser plate 12 is blocked by the outer cylinder 18 so that the coil
And the cooled fluid at the lower portion outside the coil 3 also flows from between the lower tube 8 and the outer tube 18 and flows vertically between the lower tube 8 and the outer tube 18. Flow passage 1
7, the cross flow passage 15 between the lower cylinder 8 and the upper cylinder 16.
To the upper part of the coil 3 through which the temperature rises sharply, thereby sufficiently cooling the upper part of the coil 3, the current density of the electric wire of the coil 3 can be increased, and the coil 3 can be downsized. .

[0013]

Since the present invention is configured as described above, it has the following effects. The duct spacer 13 on the lower surface of the coil holding plate 12 and the transformer coil 8
An annular horizontal barrier 14 is provided between the lower cylinder 8 and the upper cylinder 16 via a lateral flow passage 15 above the lower cylinder 8 outside the coil 3.
Since the outer tube 18 is provided outside the upper tube 16,
The heated fluid flowing out of the duct on the lower surface of the coil holding plate 12 is not blocked by the outer cylinder 18 and does not flow into the upper portion of the coil 3 as in the related art. Is cooled by the lower cylinder 8 and the outer cylinder 18.
, Flows through the vertical flow passage 17 between the lower cylinder 8 and the outer cylinder 18, flows into the upper part of the coil 3 through the horizontal flow path 15 between the lower cylinder 8 and the upper cylinder 16, The upper part of the coil 3 where the temperature rises sharply can be sufficiently cooled, the current density of the electric wire of the coil 3 can be increased, and the coil 3 can be downsized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a right half of one embodiment of the present invention.

FIG. 2 is a sectional view of the right half of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 Transformer coil 4 Shield 6 Insulated inner cylinder 7 Inner duct 8 Insulated lower cylinder 9 Outer duct 10 Inner barrier 11 Outer barrier 12 Coil holding plate 13 Duct spacer 14 Horizontal barrier 15 Horizontal flow path 16 Insulated upper cylinder 17 Vertical flow path 18 Insulating outer cylinder

Claims (1)

[Claims] 1. A transformer coil in which disk-wound unit windings are vertically stacked via a horizontal duct, an insulating inner cylinder provided inside the coil via an inner duct, and the coil An insulative lower cylinder provided on the lower half of the outer cylinder through an outer duct, and provided on the outer side of the inner cylinder and on the inner side of the lower cylinder to guide the flow of the cooling fluid upward from the lower part in a zigzag manner. An inner barrier and an outer barrier, annular shields provided on upper and lower end surfaces of the coil, a coil presser plate for pressing the coil via the upper shield, and a lower surface of the presser plate, A duct spacer for guiding a fluid from the inside to the outside; an annular horizontal barrier provided between the spacer and the upper shield; and an insulating material provided above the lower cylinder via a lateral flow passage. A transformer having an upper end connected to an outer peripheral portion of a lower surface of the horizontal barrier and an insulating outer cylinder provided outside the upper and lower cylinders via a vertical flow passage. Coil cooling device.