JPH0817645A - Gas insulation transformer - Google Patents

Abstract

PURPOSE:To provide a gas insulation transformer of high cooling efficiency and reliability wherein the capacity of a blower is not increased even in the case that the build of winding is large. CONSTITUTION:Insulating cylinders 2a, 2b are arranged inside and outside the winding direction of a winding 1 constituted of a plurality of sections 1s. Gaps 4 sufficient to make insulating gas flow are formed between adjacent sections 1s of the winding 1. An insulating cylinder 21 provided with holes is arranged between the inner insulating cylinder 2a and the winding 1. A cooling duct 31 is formed between the insulating cylinder 21 provided with holes and the inner insulating cylinder 2a. Penetrating holes 22 are formed in a plurality of portions in the vertical direction facing the gaps 4 between the sections 1s. The area of the penetrating holes in the upper part is set larger than the area of the penetrating holes in the lower part. The interval of the cooling duct 31 is set larger than the interval between the insulating cylinder 21 provided with holes and the winding 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated transformer having a gas flow path for cooling between windings or inside the windings.

[0002]

2. Description of the Related Art In recent years, a gas-insulated transformer using an incombustible insulating gas as an insulating medium has been attracting attention as a transformer replacing an oil-insulated transformer for disaster prevention reasons. There are various configurations for the windings of the gas insulation transformer, and one of them is the dry type that performs both cooling and insulation with an insulation gas. This dry-type gas-insulated transformer uses a more expensive liquid cooling medium than the semi-pool type or spray type that is combined with a liquid cooling medium and the separate-type gas-insulated transformer that separates cooling and insulation. Since it is not used, the structure is simple, an inexpensive and highly reliable transformer can be manufactured, and it can be applied to a high-voltage and large-capacity transformer. This dry type gas cooled gas insulated transformer
Almost the same as the conventional oil-insulated transformer, a wire made of a polymer wire and a copper wire wound thereon is used, and the cooling and insulating medium is changed from insulating oil to insulating gas.

However, in order to change the cooling and insulating medium from insulating oil to insulating gas as described above, it is necessary to increase the cooling gas flow rate of the insulating gas at each stage as compared with the cooling oil flow rate. is there. In other words, insulating gas has a smaller heat capacity than insulating oil, so if you configure a transformer with the same voltage and current capacity, you must circulate a much larger amount of gas per unit time than in insulating oil, and the winding The heat generated by the generated loss cannot be cooled. Therefore, conventionally, a cooling method as shown in FIGS. 6 and 7 is adopted according to the size of the winding.

First, FIG. 6 shows a gas insulation transformer of a cooling system which is adopted when the build of the winding (thickness in the winding direction) is small. This cooling method is a method of flowing a large amount of gas along the inner peripheral surface and the outer peripheral surface of the winding, and is generally called a duct flow method. That is, as shown in FIG. 6, insulating cylinders 2a and 2b are respectively arranged inside and outside the winding direction of the winding 1 including a plurality of sections 1s, and the insulating cylinders 2a and 2b inside and outside the winding 1 and the winding 1 are separated from each other. Cooling ducts 3a and 3b are formed therebetween.

In the gas-insulated transformer of FIG. 6 constructed as described above, the amount of heat generated in the winding 1 is taken away by the gas flow 10 of the insulating gas. That is, the gas supplied to the lower portions of the cooling ducts 3 a and 3 b formed inside and outside the winding 1 flows along the inner peripheral surface and the outer peripheral surface of the winding 1 in the gas flow 10
Thus, the gas flow 10 removes heat from the inner peripheral surface and the outer peripheral surface of the winding 1 and cools this portion. As a result of cooling the inner peripheral surface and the outer peripheral surface of the winding wire 1 in this way, a temperature gradient is generated in the build direction of the winding wire 1 with respect to the temperature of the gas in this portion, and the build center portion of the winding wire 1 is formed. The amount of heat generated at is transmitted in the build direction.

By the way, when a temperature gradient is generated in the build direction of the winding 1 as described above, the temperature at the center of the build of the winding 1 increases. When the build of the winding 1 is small, there is no problem because the temperature of the central portion of the build of the winding 1 does not exceed the heat resistant temperature of the insulator. However, when the build of the winding 1 becomes large, the temperature at the center of the build may exceed the heat resistant temperature of the insulator.

Therefore, when the build of the winding 1 is large enough to cause a problem in the heat resistant temperature in the above duct flow system, the cooling system as shown in FIG. 7 is adopted.
That is, as shown in FIG. 7, as in FIG. 6, insulating cylinders 2a and 2b are arranged inside and outside the winding direction of the winding wire 1 configured by stacking a plurality of sections 1s in the axial direction, Cooling ducts 3a and 3b are formed between the inner and outer insulating cylinders 2a and 2b and the winding 1, respectively. Further, between the adjacent sections 1s of the winding 1, gaps 4 sufficient for flowing an insulating gas are respectively formed, and gas stop collars 5 are attached to the gaps 4 for each certain number of sections 1s. In addition, 6 in the drawing is the inner and outer insulating cylinders 2a and 2b.
Is a duct piece that is disposed between the coil 1 and the winding 1 to maintain the intervals between the respective parts.

In the gas-insulated transformer of FIG. 7 constructed in this way, the cooling duct 3 formed inside and outside the winding 1 is formed.
In the gap 4 between a and 3b and the section 1s, the gas flow 1
0 flows and the gas stop collar 5 reverses the flow of the gas flow 10, so that the gas flow 10 flows in a zigzag manner as a whole of the winding 1. Therefore, the amount of heat generated in the winding wire 1 is robbed from the inner peripheral surface and the outer peripheral surface of the winding wire 1 and from the surfaces on both axial sides of the section 1s,
Therefore, the entire surface of the section 1s of the winding 1 is cooled. That is, according to the cooling method of FIG. 7, unlike the cooling method of FIG. 6, the build central portion of the winding 1 can be cooled, so that the temperature of the build central portion of the winding 1 is higher than that of the insulator. It is possible to have a structure that does not exceed the temperature.

FIG. 8 is a diagram showing the entire conventional gas-insulated transformer as shown in FIGS. 6 and 7, in which a coil 7 is wound around an iron core 8 in a tank 7 filled with an insulating gas. The transformer main body is configured by accommodating the contents of a transformer formed by arranging 1 and the insulating cylinder 2 in a single layer or a plurality of layers (a plurality of layers in the figure). In this case, reference numeral 9 in the drawing is a baffle provided outside the winding 1 for holding the pressure difference. Further, outside the tank 7, a cooler 11 and a blower 12 are arranged and communicate with the inside of the tank 7 through a gas pipe 13 to form a gas circulation system.

In the gas circulation system shown in FIG. 8, the gas insulation transformer is cooled as follows.
That is, the cooling cycle in which the insulating gas cooled by the cooler 11 is supplied into the tank 7 by the blower 12 to cool the winding 1 portion, and then the insulating gas is recovered and cooled again by the cooler 11 is used. By repeating, the gas-insulated transformer is continuously cooled.

[0011]

However, the conventional cooling type gas-insulated transformer as shown in FIG. 7 has the following problems. That is, as shown in FIG. 7, when the gas flow 10 is made to flow in a zigzag manner as a whole of the winding 1, the entire surface of the section 1s of the winding 1 can be cooled, but the total length of the gas flow path becomes long and the gas flow Pressure loss increases. Therefore, in the gas circulation system shown in FIG.
In order to circulate a large amount of gas that can sufficiently cool the fan, a blower with a large capacity that can handle this pressure loss is used.
2 is needed. Further, in the gas circulation system shown in FIG. 8, when the pressure loss in the winding 1 portion is large, a large pressure is applied to the baffle 9 that maintains the pressure difference outside the winding 1. In this case, since it is necessary to secure sufficient mechanical strength of the baffle 9, the number of parts increases,
This leads to an increase in assembly time and an increase in cost. Moreover, the blower 12 having a large capacity increases in size and price as the capacity increases. Therefore, by using the blower 12 having a large capacity, the gas insulated transformer as a whole becomes large in size and expensive.

The present invention has been proposed in order to solve the above problems of the prior art, and its purpose is to:
It is an object of the present invention to provide a gas-insulated transformer with high cooling efficiency and high reliability, which does not increase the capacity of the blower even when the build of windings is large.

[0013]

According to the present invention, an iron core and a winding formed by laminating a plurality of sections around the axial direction of the iron core are arranged inside a tank filled with an insulating gas, and a longitudinal direction between the sections is set. In a gas-insulated transformer having a gap through which a gas flows, an insulating cylinder is arranged in the vicinity of the winding as follows and is configured.

According to another aspect of the gas-insulated transformer of the present invention, first and second insulating cylinders are arranged inside and outside the winding direction of the winding, respectively.
A third insulating cylinder is arranged between one of the first and second insulating cylinders and the winding, and between the third insulating cylinder and the adjacent first or second insulating cylinder. A duct is formed through which insulating gas flows. A plurality of through holes are provided in the axial direction of the third insulating cylinder.

The gas-insulated transformer according to any one of claims 2 to 4, in particular, in a gas-insulated transformer having a plurality of windings arranged inside and outside, the insulating cylinder is arranged near the winding as follows. Is characterized by.

According to another aspect of the gas-insulated transformer of the present invention, insulating cylinders are arranged inside and outside each winding direction of the plurality of windings.
A duct in which an insulating gas flows is formed between two adjacent insulating cylinders between adjacent inner and outer windings. Further, it is characterized in that a plurality of through holes are provided in the axial direction of any one of the insulating cylinders constituting this duct.

According to another aspect of the gas-insulated transformer of the present invention, insulating cylinders are arranged inside and outside each winding direction of the plurality of windings.
A duct in which an insulating gas flows is formed between two adjacent insulating cylinders between adjacent inner and outer windings. Further, it is characterized in that a plurality of through holes are provided in the axial direction of both of the insulating cylinders constituting this duct.

According to another aspect of the gas-insulated transformer of the present invention, the insulating cylinder is not arranged between the plurality of windings, and the first and second windings are provided inside the innermost winding and outside the outermost winding. Insulating cylinders are respectively arranged, and a third insulating cylinder is arranged between one of the first and second insulating cylinders and a winding wire to which the insulating cylinder is attached, and the third insulating cylinder is A duct for flowing gas is formed between the first and second insulating cylinders adjacent to each other. A plurality of through holes are provided in the axial direction of the third insulating cylinder.

A gas-insulated transformer according to claims 5 and 6 is the gas-insulated transformer according to any one of claims 1 to 4,
The feature is that the intervals of the ducts or the areas of the through holes of the insulating cylinder are set as follows. That is, in the gas-insulated transformer according to claim 5, the distance between the ducts formed between the two insulating cylinders is larger than the distance between the insulating cylinder having the through hole and the winding facing the insulating cylinder. It is characterized by that. The gas-insulated transformer according to claim 6 is characterized in that the area of the through-hole per unit area of the insulating cylinder provided with the through-hole is increased from the lower part to the upper part of the insulating cylinder.

[0020]

According to the gas-insulated transformer of the present invention having the above structure, the following effects can be obtained.

That is, in the gas-insulated transformer of the present invention, by supplying gas to the duct formed between the two insulating cylinders, the gas flows from the through hole of the insulating cylinder in the winding direction of the winding. To cool the winding. In the present invention, when the through hole of the insulating cylinder is sufficiently large, most of the pressure loss due to the flow of gas occurs when passing through the through hole of the insulating cylinder and when passing through the gap between the winding sections. However, in the present invention, since the gas passes through these pressure loss portions only once, the pressure loss can be made as small as possible. That is, in the present invention, although the partial pressure loss is large, the gas flows in the winding in parallel in this pressure loss portion, so that the gas flow in the winding is greater than that in the case where the gas flows in the zigzag inside the winding. The total pressure loss from the inlet to the outlet of the entire channel is small.

Therefore, in the present invention, the pressure loss can be minimized and the cooling efficiency can be improved even when a large amount of gas is passed in order to remove the amount of heat generated in the winding for cooling. Further, since the pressure applied to the pressure difference holding baffle provided outside the winding can be made as small as possible, the baffle can be simplified as much as possible. Furthermore, since the capacity of the blower can be made as small as possible, the blower can be downsized and the price can be reduced.
As a result, it is possible to reduce the size and cost of the entire gas insulated transformer.

According to the first aspect of the present invention, by supplying gas to the duct formed between the third insulating cylinder and the first or second insulating cylinder adjacent to the third insulating cylinder, the gas is converted into the third insulating cylinder.
It is guided from the through hole of the insulating cylinder to the gap between the sections of the winding, and flows in this winding direction in the winding direction to cool the winding. Here, when the third insulating cylinder is provided on the side of the first insulating cylinder which is the inner side in the winding direction, the gas flows from the inner side to the outer side in the winding direction of the winding. Further, when the third insulating cylinder is provided on the second insulating cylinder side which is the outer side in the winding direction, the gas flows from the outer side to the inner side in the winding direction of the winding.

According to the second aspect of the invention, the gas is supplied to the duct formed between the two insulating cylinders adjacent to each other between the windings, so that the gas is passed through the through hole of one insulating cylinder. Is guided to the gap between the sections of the winding to which it is attached and flows in this winding direction in the winding direction, cooling the inner or outer winding. Here, when the through hole is provided in the inner insulating cylinder (the outer insulating cylinder of the inner winding) of the two adjacent insulating cylinders, the gas flows from the outer side to the inner side in the winding direction of the inner winding. Will flow toward and cool this inner winding. Further, when the through hole is provided in the outer insulating cylinder (the inner insulating cylinder of the outer winding) of the two adjacent insulating cylinders, the gas flows from the inner side to the outer side in the winding direction of the outer winding. Flow towards and cool this outer winding.

According to the third aspect of the present invention, the gas is supplied to the duct formed between the two insulating cylinders adjacent to each other between the windings, so that the gas passes through the holes of both insulating cylinders. Is guided to the gap between the sections of the respective windings to which the respective insulating cylinders are attached, and flows in this winding direction in the winding direction to cool the respective windings. That is, the gas is branched into both insulating cylinders, flows from the through hole of the inner insulating cylinder (outer insulating cylinder of the inner winding) toward the inner side in the winding direction of the inner winding, Of the outer winding (the inner insulating cylinder of the outer winding), and at the same time, the outer winding is cooled by flowing toward the inner side in the winding direction of the outer winding. become.

According to the fourth aspect of the invention, the gas is supplied to the duct formed between the third insulating cylinder and the first or second insulating cylinder adjacent to the third insulating cylinder.
It is guided from the through hole of the insulating cylinder to the gap between the sections of the plurality of windings, and flows through the gap in the winding direction to sequentially cool the plurality of windings. Here, when the third insulating cylinder is provided on the inner side in the winding direction, that is, on the side of the first insulating cylinder, the gas flows from the inner side to the outer side in the winding direction of the innermost winding. Further, when the third insulating cylinder is provided on the second insulating cylinder side which is the outer side in the winding direction, the gas flows from the outer side in the winding direction of the outermost winding toward the inner side.

According to the invention of claim 5, the interval of the duct formed between the two insulating cylinders is made larger than the interval between the insulating cylinder having the through hole and the winding facing the insulating cylinder. As a result, the gas blown out from the through hole of the insulating cylinder easily flows into the gap between the sections of the windings facing each other. Therefore, the cooling efficiency can be improved. According to the invention described in claim 6, by increasing the area of the through hole per unit area of the insulating cylinder from the lower part to the upper part of the insulating cylinder, the amount of gas blown out in the vertical direction of the insulating cylinder is made uniform. can do. That is, since the gas ejection pressure in the vertical direction becomes smaller toward the upper part, the area of the through hole is made larger toward the upper part, which is the opposite of this ejection pressure. Can be secured. Therefore, the cooling efficiency of the entire gas insulated transformer can be improved.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of the gas insulation transformer according to the present invention will be specifically described below with reference to FIGS. The same parts as those of the conventional technique shown in FIGS. 6 to 8 are designated by the same reference numerals.

[1] First Embodiment FIG. 1 and FIG. 2 FIG. 1 is a diagram showing a first embodiment of a gas insulation transformer according to the present invention. This first embodiment is particularly applicable to claims 1, 5 and
7 is an embodiment to which the inventions described in 6 and 6 are applied. That is, in the present embodiment, first, as shown in FIG. 1, the insulation of the first and second insulation cylinders of the present invention is provided inside and outside the winding direction of the winding wire 1 configured by laminating a plurality of sections 1s. Tube 2a,
2b are respectively arranged, and between the adjacent sections 1s of the winding 1, gaps 4 sufficient to allow the insulating gas to flow are formed in the longitudinal direction thereof. Further, in the present embodiment, the insulating cylinder with a hole 21 which is the third insulating cylinder of the present invention is arranged between the inner insulating cylinder 2a and the winding 1, and the insulating cylinder with a hole 21 and the inner side. A cooling duct 31 is formed between the cooling duct 31 and the insulating cylinder 2a. On the other hand, a cooling duct 3 is formed between the outer insulating cylinder 2b and the winding 1. Further, the inner insulating cylinder 2a and the insulating cylinder 21 with holes are
Between the insulating cylinder with hole 21 and the winding 1, and between the winding 1 and the outer insulating cylinder 2b, a duct piece 6 as shown in FIG. Is held.

As shown in FIG. 1, the insulating cylinder 21 with holes of this embodiment is provided with through holes 22 at a plurality of vertical positions facing the gaps 4 between the sections 1s of the winding 1. There is. As shown in FIG. 2, the through holes 22 are circular through holes arranged at equal intervals in the circumferential direction. In this case, the through-hole 22 in the upper part of the insulating cylinder with hole 21 has a larger diameter than the through-hole 22 in the lower part. Therefore, the area of the through-hole 22 in the upper part is larger than the area of the through-hole 22 in the lower part. Has been done. Further, these through holes 22 are arranged so as not to overlap the duct piece 6 (not shown). Further, as shown in FIG. 1, a cooling duct 31 formed between the inner insulating cylinder 2a and the insulating cylinder 21 with holes.
Is larger than the distance between the insulating cylinder with hole 21 and the winding 1. On the other hand, reference numeral 23 in the figure denotes end gas stoppers provided at both upper and lower ends of the winding 1. The upper and lower end gas stoppers 23 surround the winding 1 together with the inner and outer insulating cylinders 2a and 2b. The space is separated from the surrounding space. That is, the upper and lower end gas stoppers 23 are provided in the cooling duct 3.
The upper and lower ends of the winding 1 are covered, leaving the gas supply port 24 for the coil 1 and the gas outlet 25 for the cooling duct 3.

Although the other parts are not shown, they have the same structure as the conventional example shown in FIG. That is, the insulating cylinders 2a, 2
The transformer contents formed by arranging one or a plurality of windings 1 including b and 21 are housed, and a baffle 9 for holding a pressure difference is provided outside the windings 1. Further, a cooler 11 and a blower 12 are arranged outside the tank 7, and communicate with the inside of the tank 7 via a gas pipe 13 to form a gas circulation system.

The operation of this embodiment having the above-mentioned structure is as follows. First, at the time of operation of the gas insulation transformer, the gas cooled by the cooler 11 (not shown) is fed by the blower 12 (not shown) to the winding 1 portion in the tank 7, that is, the inner insulating cylinder 2a. The gas is supplied to the lower portion of the cooling duct 31 formed between the insulating cylinder with a hole 21 and the gas supply port 24. The gas thus supplied to the lower portion of the cooling duct 31 becomes the gas flow 10 flowing upward in the cooling duct 31. Then, the gas flow 10 is diverted one after another at each of the through holes 22 of the insulating cylinder with hole 21 and is blown out between the insulating cylinder with hole 21 and the winding 1.

In this case, since the gap between the insulating cylinder 21 with a hole and the winding wire 1 is narrower than the gap of the cooling duct 31, the gas flow 10 blown out from the through hole 22 of the insulating cylinder 21 with a hole.
Efficiently flows into the gap 4 between the sections 1s of the windings 1 that face each other, and flows in the gap 4 toward the outside in the winding direction to cool the winding 1. After this, this gas flow 10
Flows into the cooling duct 3 outside the winding 1 and joins with the gas flow 10 which also flows into the cooling duct 3 outside the winding 1 from between the other sections 1s. The gas thus merged in the cooling duct 3 is blown out from the upper portion of the cooling duct 3 through the gas discharge port 25, and the cooler 11 outside the tank 7 is provided.
Then, after being cooled again, the gas is again supplied into the tank 7 by the blower 12 as cooling gas.

As described above, in this embodiment, the gas is shunted one after another in each through hole 22 of the insulating cylinder with a hole 21 and flows in parallel in the winding 1, so that the gas of the conventional example shown in FIG. Compared with the method in which gas flows in the winding 1 in a zigzag manner,
The total pressure loss from the inlet to the outlet of the entire gas passage of the winding 1 becomes small. Therefore, in this embodiment,
Even if a large amount of gas is flowed in order to remove the heat generated in the winding 1 and cool it, the pressure loss can be made as small as possible,
The cooling efficiency can be improved.

Since the pressure loss can be reduced in this way, the pressure applied to the pressure difference holding baffle 9 provided outside the winding 1 can be reduced as much as possible. Therefore, the baffle 9 can be simplified as much as possible. Can be converted.
That is, since it is not necessary to sufficiently secure the mechanical strength of the baffle 9, the number of parts can be reduced, the assembly time can be shortened, and the cost can be reduced. Further, since the pressure loss can be reduced, the capacity of the blower 12 can be reduced as much as possible, so that the blower 12 can be downsized and reduced in price. As a result, it is possible to reduce the size and cost of the entire gas insulated transformer.

By the way, each through hole 2 of the insulating cylinder 21 with a hole
Since the gas ejection pressure in 2 becomes smaller toward the top, assuming that the size of each through hole 22 is the same above and below the insulating cylinder with hole 21, the through hole 2 of the insulating cylinder with hole 2
The amount of gas blown from 2 becomes smaller toward the upper part. On the other hand, in the present embodiment, the diameter of the through hole 22 is increased toward the upper part of the insulating cylinder with a hole 21,
Since the area of the through hole 22 is large, it is possible to ensure a uniform blowout amount above and below the insulating cylinder with a hole 21.
The winding 1 can be cooled uniformly. Therefore, the cooling efficiency of the entire gas insulated transformer can be improved.

[2] Second Embodiment ... FIG. 3 FIG. 3 is a view showing a second embodiment of the gas insulation transformer according to the present invention. This second embodiment is particularly applicable to claims 3, 5 and
7 is an embodiment to which the inventions described in 6 and 6 are applied. That is, in the present embodiment, first, as shown in FIG. 3, the two windings 1A and 1B each formed by laminating a plurality of sections 1s are arranged inside and outside the winding direction, and the inner winding 1A is arranged. Is much larger than the outer winding 1B build. The insulating cylinder 2 and the insulating cylinder 21 with holes are arranged inside and outside the inner winding 1A, respectively.
A cooling duct 3 is formed between the insulating cylinder 2 and the winding 1A. In addition, the insulating cylinders 2a, 2 are provided inside and outside the outer winding 1B.
b are arranged respectively, and these insulating cylinders 2a, 2
Cooling ducts 3a and 3b are respectively formed between b and the winding 1B. In this case, the cooling duct 31 is also formed between the insulating cylinder 2a inside the outer winding 1B and the insulating cylinder 21 with holes in the inner winding 1A.

The insulating cylinder 21 with holes of this embodiment has the gap 4 of the winding 1A to which the insulating cylinder 21 with holes is attached.
Through holes 22 are provided at a plurality of positions in the up-down direction that face each other. Although the basic arrangement of the through holes 22 is not shown, it is constructed as shown in FIG. 2 as in the first embodiment. Further, as shown in FIG. 3, the interval of the cooling duct 31 formed between the insulating cylinder 21 with holes and the insulating cylinder 2a is made larger than the interval between the insulating cylinder 21 with holes and the winding 1A. ing. Further, the windings 1A and 1B have a certain number of section 1 (three in the figure as an example).
A gas stop collar 5 is attached to the gap 4 for each s, and the gas stop collar 5 is arranged so as to extend to a position close to the through hole 22 of the insulating cylinder with a hole 21. On the other hand, end gas stoppers 23 are provided at both upper and lower ends of the winding 1A.
Are provided respectively, and the upper and lower end gas stoppers 2
3, together with the two insulating cylinders 2 and 2a, separates the gas space surrounding the winding 1A from the surrounding space. That is, the upper and lower end gas stoppers 23 cover the upper and lower ends of the winding 1A, leaving the gas supply port 24 to the cooling duct 31 and the gas discharge port 25 from the cooling duct 3. In addition, cooler 1
The other parts such as 1 and the blower 12 are not shown in the figure, but are configured similarly to the first embodiment.

The operation of this embodiment having the above-mentioned structure is as follows. First, when the gas insulation transformer is in operation, the gas cooled by the cooler 11 (not shown) is fed by the blower 12 (not shown) to the windings 1A and 1B in the tank 7, that is, the inner windings. The cooling duct 31 formed between the insulating cylinder 21 with holes 1A and the outer winding 1B is supplied to the lower portion of the cooling duct 31 through the gas supply port 24, and the cooling ducts 3a on both sides of the outer winding 1B are provided. Three
Supply to the bottom of b. Of these, the gas supplied to the lower portion of the cooling duct 31 becomes the gas flow 10 flowing upward in the cooling duct 31. And this gas flow 10
Are sequentially shunted at the through-holes 22 of the insulating cylinder with hole 21 and are blown out between the insulating cylinder with hole 21 and the inner winding 1A. In this way, the gas flow 10 blown out from the through hole 22 of the holed insulating cylinder 21 efficiently flows into the gap 4 between the sections 1s of the inner winding 1A facing each other, and the inside of the gap 4 is wound in the winding direction. It flows toward and cools the winding 1A. In this case, the gas stop collar 5 is arranged so as to extend to the position close to the through hole 22, so that the gas flow 10 does not move in the axial direction and reliably flows in the winding direction.
Winding 1A is cooled uniformly. After this, this gas flow 10
Flows into the cooling duct 3 inside the winding 1A, merges with the gas flowing into the cooling duct 3 inside the winding 1A from between the other sections 1s, and joins from the upper part of the cooling duct 3 via the gas outlet 25. Blow out.

On the other hand, the gas supplied to the lower portions of the cooling ducts 3a and 3b on both sides of the outer winding 1B is distributed along the inner peripheral surface and the outer peripheral surface of the winding 1, respectively.
There is a gas stream 10 flowing inside. And this gas flow 10
The heat of the inner peripheral surface and the outer peripheral surface of the winding 1B is removed by this, and after cooling this portion, the gas flow 10 is blown out from the upper portions of the cooling ducts 3a and 3b.

The gas blown from the upper portion of the cooling duct 3 inside the winding 1A and the gas blown from the cooling ducts 3a and 3b on both sides of the winding 1B join together at the upper portion of the tank 7 and outside the tank 7. After being returned to the cooler 11 and cooled again, the blower 12 supplies the cooling gas again into the tank 7.

As described above, in this embodiment, the gas can flow in parallel inside the winding 1A having a large build. Therefore, as in the first embodiment, the gas flow in the winding 1A is increased. The total pressure loss from the inlet to the outlet of the entire channel is small. In this case, since the gas flows from the outside to the inside of the winding 1A in this embodiment, the gas flow direction in the winding is opposite to that of the first embodiment in which the gas flows from the inside to the outside of the winding 1. However, it is clear that such a difference in the gas flow direction has little influence on the cooling efficiency.
Therefore, also in this embodiment, the same effect as that of the first embodiment can be obtained. Since the winding 1B has a small build, the entire winding 1B can be sufficiently cooled only by cooling the inner peripheral surface and the outer peripheral surface.

Further, in this embodiment, since the gas stop collar 5 is attached to the gap 4 between the sections 1s of the winding 1A so as to extend to the position close to the through hole 22, this gas stop collar is arranged. 5, it is possible to prevent the gas from flowing in the axial direction and promote the flow in the winding direction, and the winding 1A can be cooled more uniformly. Therefore, the cooling efficiency of the entire gas insulated transformer can be further improved.

[3] Third Embodiment FIG. 4 FIG. 4 is a diagram showing a gas insulation transformer according to a third embodiment of the present invention. This third embodiment is particularly applicable to claims 3, 5 and
7 is an embodiment to which the inventions described in 6 and 6 are applied. That is, in the present embodiment, first, as shown in FIG. 4, two windings 1A and 1B each formed by laminating a plurality of sections 1s are arranged inside and outside the winding direction, and the inner winding 1A is arranged. And the build of the outer winding 1B are almost equal. Also, section 1 of the inner winding 1A
The position of the gap 4 between s and the section 1 of the outer winding 1B
The positions of the gaps 4 between s are aligned. The insulating cylinder 2a and the insulating cylinder 21a with holes are arranged inside and outside the inner winding 1A, and the insulating cylinder 21b and insulating cylinder 2b with holes are arranged inside and outside the outer winding 1B. In this case, the cooling duct 31 is formed between the two adjacent insulating cylinders with holes 21a and 21b between the inner and outer windings 1A and 1B. A cooling duct 3a is formed between the innermost insulating cylinder 2a and the inner winding 1A, and a cooling duct 3b is formed between the outermost insulating cylinder 2b and the outer winding 1B.
Are formed.

Then, the insulating cylinder 2 with two holes of this embodiment.
Through holes 22 are provided in each of 1a and 21b at a plurality of positions in the up-down direction facing the gaps 4 of the windings 1A and 1B to which the insulating cylinders with holes 21a and 21b are attached. This through hole 22
Although the basic arrangement configuration of (1) is not shown, it is configured as shown in FIG. 2 similarly to the first and second embodiments.
And again, as shown in FIG. 4, two insulating cylinders 2 with holes are provided.
The spacing of the cooling duct 31 formed between 1a and 21b is the insulating cylinders with holes 21a and 21b and the windings 1A and 1B.
The spacing between and has been greater. On the other hand, end gas stoppers 23 are provided at the upper and lower ends of the two windings 1A and 1B, respectively.
Together with the two insulating cylinders 2a, 2b, these windings 1A,
The gas space surrounding 1B is separated from the surrounding space. That is, the upper and lower end gas stoppers 23 are provided in the cooling duct 3.
The upper and lower ends of the two windings 1A and 1B are collectively covered, leaving a gas supply port 24 for the first coil 1 and a gas outlet 25 for the cooling ducts 3a, 3b. In addition, the cooler 11 and the blower 1
Although other parts such as 2 are not shown, they are configured similarly to the first and second embodiments.

The operation of this embodiment having the above configuration is as follows. First, when the gas insulation transformer is in operation, the gas cooled by the cooler 11 (not shown) is fed by the blower 12 (not shown) to the windings 1A and 1B in the tank 7, that is, the windings inside and outside. 1A, 1B
The gas is supplied to the lower portion of the cooling duct 31 formed between the two insulating cylinders 21a and 21b with holes through the gas supply port 24. The gas thus supplied to the lower portion of the cooling duct 31 becomes the gas flow 10 flowing upward in the cooling duct 31. Then, this gas flow 10 is diverted one after another at the portions of the through holes 22 of the insulating cylinders 21a and 21b with holes on both sides, and the insulating cylinders 21a and 21b with holes and the windings 1
Blow between A and 1B respectively.

In this case, the insulating cylinders 21a and 21b with holes are provided.
The gas flow 10 blown from each of the through holes 22 of
The windings 1A and 1B efficiently flow into the gaps 4 between the sections 1s, and flow inside the gaps 4 toward the inner side and the outer side in the winding direction to cool the respective windings 1A and 1B. After this, each gas stream 10 is fed to the inner winding 1A.
Of the cooling duct 3a on the inner side and the cooling duct 3b on the outer side of the winding 1B on the outer side, respectively, and joins with the gas flows 10 respectively flowing between the other sections 1s to the cooling ducts 3a, 3b on the same side. It blows out from the upper part of 3a, 3b through the gas discharge port 25. The gas blown out from the inside and outside cooling ducts 3a and 3b is returned to the cooler 11 outside the tank 7, cooled again, and then returned to the inside of the tank 7 as the cooling gas by the blower 12.

As described above, in this embodiment, the gas can flow in parallel in the inner and outer windings 1A and 1B having substantially equal builds, so that the gas in the inner and outer windings 1A and 1B can be supplied. The total pressure loss from the inlet to the outlet of the flow passage becomes small as in the first and second embodiments.
Therefore, also in this embodiment, the same effects as those of the first and second embodiments can be obtained. In addition, in the present embodiment, the two coils 1A, 1A,
Since 1B can be cooled at the same time, the structure is simple. Especially when a high voltage is applied between the two windings 1A and 1B,
When it is necessary to widen the main gap distance between the two windings 1A and 1B, the cooling duct 3 between the windings 1A and 1B is required.
Since the distance of 1 can be made large, the pressure loss can be made smaller.

[4] Fourth Embodiment ... FIG. 5 FIG. 5 is a view showing a fourth embodiment of the gas insulated transformer according to the present invention. The fourth embodiment is an embodiment to which the invention described in claims 4 to 6 is applied. That is, in this embodiment, first, as shown in FIG. 5, four windings 1A, 1B, each of which is configured by laminating a plurality of sections 1s,
1C and 1D are arranged inside and outside the winding direction. In this case, the build of each winding 1A-1D is different from each other,
In particular, the innermost winding 1A builds on the other windings 1B-1
It is much smaller than D. In addition, the section 1s of the three windings 1B to 1D excluding the innermost winding 1A
The positions of the gaps 4 therebetween are aligned. The insulating cylinders 2a and 2b are arranged inside and outside the innermost winding 1A, and cooling ducts 3a and 3b are formed between the insulating cylinders 2a and 2b and the winding 1A. ing. Further, an insulating cylinder 2 is arranged outside the outermost winding 1D, and a cooling duct 3 is formed between the insulating cylinder 2 and the winding 1D. Further, an insulating cylinder with a hole 21 is arranged between the outer insulating cylinder 2b of the inner winding 1A and the second winding 1B from the inside. The insulating cylinder with a hole 21 and the insulating cylinder 2b are connected to each other. A cooling duct 31 is formed between them. On the other hand, no insulating cylinder is arranged between the three windings 1B to 1D, and a continuous gas flow path is formed. In this case, the insulating cylinder 2b, the insulating cylinder 2, and the insulating cylinder with a hole 21 correspond to the first, second, and third insulating cylinders of the present invention, respectively.

The insulating cylinder with holes 21 of this embodiment has a space 4 between the windings 1B to which the insulating cylinder with holes 21 is attached.
Through holes 22 are provided at a plurality of positions in the up-down direction that face each other. Although the basic arrangement of the through holes 22 is not shown, it is configured as shown in FIG. 2 as in the first to third embodiments. Further, as shown in FIG. 5, the gap of the cooling duct 31 formed between the insulating cylinder 2b and the insulating cylinder 21 with holes is determined by the insulating cylinder 21 with holes and the winding 1B.
The spacing between and has been greater. In addition, the outer two
A gas stop collar 5 is attached to each of the windings 1C and 1D in a gap 4 for each suitable number of sections 1s. In this case, the gas stop collar 5 of the winding 1C is arranged so as to extend close to the winding 1B adjacent to the inside thereof, and the gas stop collar 5 of the winding 1D is adjacent to the inside thereof. It is arranged so as to extend to a position close to the line 1C. On the other hand, end gas stoppers 23 are provided at the upper and lower ends of the three windings 1B to 1D, respectively. The upper and lower end gas stoppers 23, together with the two insulating cylinders 2b and 2, have three windings. The gas space surrounding 1B to 1D is divided from the surrounding space. That is, the upper and lower end gas stoppers 23 cover the upper and lower ends of the windings 1B to 1D, except for the gas supply port 24 to the cooling duct 31 and the gas discharge port 25 from the cooling duct 3. In addition, the cooler 11 and the blower 1
Although other parts such as 2 are not shown, they are configured similarly to the first to third embodiments.

The operation of this embodiment having the above construction is as follows. First, during operation of the gas insulation transformer, the gas cooled by the cooler 11 (not shown) is fed by the blower 12 (not shown) to the windings 1A to 1D in the tank 7, that is, the innermost winding. While supplying to the lower part of the cooling ducts 3a and 3b formed between the windings 1A and the insulating cylinders 2a and 2b inside and outside the wire 1A,
The gas is supplied to the lower portion of the cooling duct 31 formed between the insulating cylinder 2b and the insulating cylinder with a hole 21 through the gas supply port 24. Of these, the gas supplied to the lower portion of the cooling duct 31 becomes the gas flow 10 flowing upward in the cooling duct 31. Then, the gas flow 10 is branched at the portions of the holes 22 of the perforated insulating cylinder 21 one after another, and the perforated insulating cylinder 2
Blow between 1 and winding 1B.

In this case, each through hole 2 of the insulating cylinder 21 with a hole
The gas flow 10 blown out from each of the two windings is the section 1 of the three windings 1B to 1D in which the insulating cylinder is not provided.
Each of the gaps 4 flows efficiently into the gap 4
Each of the windings 1B to 1 sequentially flows in the winding direction to the outside in the winding direction.
Cool each D. In this case, the gas stop collar 5 is arranged in the two windings 1C and 1D on the downstream side so as to extend to the position close to the gap 4 of the adjacent upstream windings, and therefore the gas flow 10 is axial. Does not move in the direction, but flows in the winding direction reliably, and the windings 1C and 1D are uniformly cooled. After this, the gas flow 10 flows into the cooling duct 3 outside the outermost winding 1D, merges with the gas flow 10 that also flows into the cooling duct 3 from between the other sections 1s, and the gas flows from the upper part of the cooling duct 3. Blow out through the outlet 25.

On the other hand, the gas supplied to the lower portions of the cooling ducts 3a and 3b on both sides of the innermost winding 1A are respectively
Along the inner and outer peripheral surfaces of the winding 1, the cooling duct 3a,
It becomes a gas flow 10 flowing in 3b. The gas flow 10 removes heat from the inner peripheral surface and the outer peripheral surface of the winding 1A to cool this portion, and then the gas flow 10 is blown out from the upper portions of the cooling ducts 3a and 3b.

The gas blown from the upper portion of the outer cooling duct 3 and the gas blown from the cooling ducts 3a and 3b on both sides of the innermost winding 1A join the upper portion of the tank 7 and reach the outside of the tank 7. After being returned to the cooler 11 and cooled again, it is returned to the tank 7 again as a cooling gas by the blower 12.

As described above, in this embodiment, three continuous windings 1B to 1D having a relatively large build are provided.
In the form in which the gas sequentially passes through each of the aligned gaps 4, the gas can flow in parallel outward in the winding direction.
The total pressure loss from the inlet to the outlet of the gas passages of the three windings 1B to 1D can be significantly reduced. Therefore, also in the present embodiment, the first to third
The same effect as the embodiment can be obtained. Since the build of the winding 1A is small, the entire winding 1A can be sufficiently cooled only by cooling the inner peripheral surface and the outer peripheral surface.

Further, in this embodiment, the gas stop collar 5 is attached to the gap 4 between the sections 1s of the two windings 1C and 1D on the downstream side, and the gap 4 between the adjacent windings on the upstream side.
Since the gas stop collar 5 is arranged so as to extend between the adjacent positions, it is possible to prevent the gas from flowing in the axial direction and promote the flow in the winding direction, and the windings 1B to 1D.
Can be cooled more uniformly. Therefore, the cooling efficiency of the entire gas insulated transformer can be further improved. Further, in the present embodiment, the same cooling duct 31
Since the three windings 1B to 1D can be continuously cooled by the gas flowing in from, the configuration is simple.

[5] Other Embodiments The present invention is not limited to the above embodiments,
In addition, various modified examples can be implemented. For example, in the first embodiment, the area of the through holes of the insulating cylinder with holes is adjusted by changing the diameter of the through holes, but it can be adjusted by changing the number of through holes or a combination thereof. It is possible. In addition, in the first, second, and fourth embodiments, it is also possible to provide an insulating cylinder with a hole on the opposite side in the winding direction and allow the gas flow to flow in the opposite direction.

Further, in the third embodiment,
One winding is cooled by each gas flow in two directions divided in two directions from the cooling duct, but one or more gas flows in two directions cool two or more windings. It can also be configured to do so. On the other hand, in the fourth embodiment, the three windings are sequentially cooled by the gas flow from the cooling duct in one direction, but only two windings are cooled, or conversely four windings are cooled. It is also possible to sequentially cool the above windings.

Further, the number of windings, the number of sections constituting the windings, the specific size of the gap between the sections, the specific size ratio of the cooling duct and the gap, etc. are all designed. It is a matter of choice and can be set freely.
Further, since the present invention relates to the improvement of the gas flow path structure of the gas insulation transformer, the parts other than the gas flow path structure around the winding as shown in each of the embodiments can be freely arranged. It is configurable.

[0060]

As described above, according to the present invention, a through hole is provided in the insulating cylinder inside or outside the winding, and gas is supplied from this through hole into the gap between the windings, so that By providing gas flow in the winding direction, it provides a gas-insulated transformer with high cooling efficiency and high reliability without increasing the capacity of the blower even when the build of the winding is large. can do.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a first embodiment of a gas insulation transformer of the present invention.

FIG. 2 is a schematic perspective view showing the insulating cylinder of FIG.

FIG. 3 is a schematic cross-sectional view showing a second embodiment of the gas insulation transformer of the present invention.

FIG. 4 is a schematic cross-sectional view showing a third embodiment of the gas insulation transformer of the present invention.

FIG. 5 is a schematic sectional view showing a fourth embodiment of the gas insulation transformer of the present invention.

FIG. 6 is a schematic cross-sectional view showing an example of windings of a conventional gas insulated transformer.

FIG. 7 is a schematic cross-sectional view showing another example of windings of a conventional gas insulated transformer.

8 is a schematic cross-sectional view showing an example of a conventional gas insulated transformer including the winding shown in FIG. 6 or FIG.

[Explanation of symbols]

 1, 1A to 1D ... Winding 1s ... (of winding) Section 2, 2a, 2b ... Insulating cylinder 3, 3a, 3b, 31 ... Cooling duct 4 ... Gap (between sections) 5 ... Gas stop collar 6 ... Duct Piece 7 ... Tank 8 ... Iron core 9 ... Baffle 10 ... Gas flow 11 ... Cooler 12 ... Blower 13 ... Gas pipes 21, 21a, 21b ... Insulation cylinder with hole 22 ... Through hole 23 ... End gas stop 24 ... Gas supply Mouth 25 ... Gas outlet

Claims (6)

[Claims] 1. A gap formed by arranging an iron core and a winding formed by laminating a plurality of sections around an axial direction of the iron core inside a tank filled with insulating gas, and flowing the insulating gas in the longitudinal direction between the sections. In the gas-insulated transformer, the first and second insulating cylinders are respectively arranged inside and outside the winding direction of the winding, and one of the first and second insulating cylinders is connected to the winding. A third insulating cylinder is arranged between the third insulating cylinder and the first or second insulating cylinder adjacent to the third insulating cylinder to form a duct through which the insulating gas flows, and a shaft of the third insulating cylinder. A gas-insulated transformer characterized in that a plurality of through holes are provided in the direction. 2. Inside a tank filled with an insulating gas, an iron core and a plurality of windings, each of which is formed by laminating a plurality of sections around the iron core axial direction, are arranged inside and outside, and in the longitudinal direction between the sections. In a gas-insulated transformer provided with a gap through which an insulating gas flows, insulating cylinders are respectively arranged inside and outside the winding direction of each of the plurality of windings, and two adjacent insulating cylinders are provided between adjacent inner and outer windings. A gas-insulated transformer, characterized in that a duct through which the insulating gas flows is formed between the two, and a plurality of through holes are provided in the axial direction of one of the insulating cylinders constituting the duct. 3. An iron core and a plurality of windings respectively configured by laminating a plurality of sections around the axial direction of the iron core are arranged inside and outside in a tank filled with an insulating gas, and the windings are arranged in the longitudinal direction between the sections. In a gas-insulated transformer provided with a gap through which an insulating gas flows, insulating cylinders are respectively arranged inside and outside the winding direction of each of the plurality of windings, and two adjacent insulating cylinders are provided between adjacent inner and outer windings. A gas-insulated transformer, characterized in that a duct through which the insulating gas flows is formed between the two, and a plurality of through holes are provided in the axial direction of both insulating cylinders constituting the duct. 4. An iron core and a plurality of windings respectively configured by laminating a plurality of sections around the axial direction of the iron core are arranged inside and outside in a tank filled with an insulating gas, and the winding is formed in the longitudinal direction between the sections. In a gas-insulated transformer provided with a gap for flowing an insulating gas, an insulating cylinder is not arranged between the plurality of windings, and the first and second windings are provided inside the innermost winding and outside the outermost winding. The second insulating cylinders are arranged, and the third insulating cylinder is arranged between one of the first and second insulating cylinders and the winding to which the insulating cylinder is attached. A gas-insulated transformer, characterized in that a duct for flowing gas is formed between the cylinder and an adjacent first or second insulating cylinder, and a plurality of through holes are provided in the axial direction of the third insulating cylinder. . 5. The distance between the ducts formed between the two insulating cylinders is set to be larger than the distance between the insulating cylinder having a through hole and the winding facing the insulating cylinder. The gas-insulated transformer according to claim 1, claim 2, claim 3, or claim 4. 6. The insulating cylinder having a through hole, wherein the area of the through hole per unit area of the insulating cylinder is increased from the lower part to the upper part of the insulating cylinder. The gas insulated transformer according to claim 4 or claim 5.