JP2003178922A - Stationary induction apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a compact stationary induction apparatus because the apparatus can be cooled properly in response to the functions of each winding and service conditions without increasing a cooling device. <P>SOLUTION: A structure interrupting the passage of a cooling medium is installed on the lower side of the winding having small electrical loss, and cooling efficiency is improved by naturally cooling the winding having small electrical loss while increasing the flow rate of the cooling medium passed through a winding having large electrical loss. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction generator, and more particularly to a static induction generator suitable for cooling a winding with a cooling medium such as an insulating gas or an insulating liquid.

[0002]

2. Description of the Related Art In general, a static induction electric generator includes a main body of a static induction electric device composed of an iron core, a coil, etc., a tank for accommodating the main body of the static induction electric device, and And an insulating cooling medium for electrical insulation and cooling.

By the way, since the life of the static induction electric device depends on the temperature rise of the insulator and the insulating cooling medium, the upper limit value of the temperature of the refrigerant and the winding is defined by the standard or the like. When running a static induction generator, heat is generated from the windings and the iron core.
The temperature rise of the main body of the static induction generator is suppressed by providing a heat radiation means so as not to raise the temperature of the static induction generator itself by introducing this heat to the outside or by forcedly circulating the cooling medium.

Japanese Patent Laid-Open No. 6-231972 discloses an example of cooling the electric device body by forcibly circulating such a cooling medium. An example of this is shown in FIG. The conventional static induction electric machine shown in the figure has a low voltage winding 3 wound around an iron core 1 via an inner insulating tube 2 and a high voltage winding around the low voltage winding 3 via an inner insulating tube 4. 5 is wound and the high voltage winding 5
A tap winding 7 is wound around the inside of the coil via an inner insulating cylinder 6 for the tap winding. Further, tap winding support insulators 8 are arranged on both upper and lower sides of the tap winding 7, and an insulator 9 having a collar 9a in the lower tap winding support insulator 8 is provided.
And an outer insulating cylinder 10 for the tap winding is arranged around the tap winding 7.

Then, the cooling medium 11 is provided on each of the windings 3, 5, and 7.
Stoppers 12 for flowing zigzags in the windings as shown by the arrows are arranged between the insulating cylinders and the windings so as to block a part of each vertical duct to form the main body of the static induction electric device. The contents body together with the cooling medium 11 is in the tank 13
Inside the tank 13, a cooling device 14 for cooling the medium body by forcibly circulating the cooling medium 11 is provided on the outer side of the tank 13. In addition, 17
Is an iron core tightening metal fitting for tightening the iron core 1 and at the same time supporting the winding and the insulator. Reference numeral 18 is an iron core push bolt for vertically tightening the iron core and the winding wire, 19 is an insulating ring for supporting the winding wire, and 24 is an insulator piece.

Next, the cooling action will be described. The stopper 12 described above includes the windings 3, 5, 7 and the isolation cylinders 2, 4,
Since the cooling medium 11 is provided so as to flow in a zigzag manner between the coils 7, when the cooling medium 11 flows evenly, the cooling medium 11 is forced to flow from the lower outside of each winding 3, 5, 7. The cooling medium 11 flows axially from the outer side to the inner side of each winding and from the inner side to the outer side of each winding to uniformly cool each winding.

Here, the tap winding 7 wound on the outermost layer
Generally has a smaller winding capacity than the other windings 3, 5,
Therefore, the heat generated in the winding is small. Therefore, in the tap winding 7, the insulator 9 having the collar 9a is attached to the tap winding 7
Of the tap winding 7 and the outer insulation 10 of the tap winding wound around the tap winding 7 and the outer periphery thereof.
The cross-sectional area of the cooling medium 11 formed between and is reduced, the flow path resistance is increased, and the flow rate of the cooling medium 11 flowing through the tap winding 7 is reduced. Therefore, a large amount of cooling medium 1 can be applied to the windings other than the tap winding.
Can flow 1.

[0008]

The conventional static induction electric generator is constructed as described above. However, when the cooling medium is forced to flow through the winding that has a small electric loss in operation, the electric current is reduced by that amount. Since the flow rate of the cooling medium flowing through the winding with large loss decreases, the temperature increase of the winding with large electrical loss increases correspondingly, which is uneconomical. In order to cool this temperature rise, it is necessary to strengthen the cooling device accordingly.

The present invention has been made in view of the above points, and an object thereof is to provide a compact static induction generator by appropriately cooling according to the function of each winding and the use condition. Especially.

[0010]

In order to achieve the above object, according to the present invention, a cooling medium flows into the inlet end of a vertical duct in which a winding having a small electric loss is accommodated so that the inlet of the vertical duct is blocked. The feature is that a partition plate is provided so as not to do so.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A static induction electric machine will be described below based on the illustrated embodiment. The same reference numerals are used for the same reference numerals, and the description thereof will be omitted. 1 and 2
Fig. 1 shows a transformer which is an example of the static induction generator of the present invention. As shown in the figure, an iron core 1 is arranged in a tank 13, and a low voltage winding 3 is wound between the iron core 1 and the tank 13 and around the iron core 1 via an inner insulating cylinder 2. A high-voltage winding 5 is wound around the low-voltage winding 3 via an inner insulating cylinder 4, and a tap winding 7 with small electrical loss is wound around the outer circumference of the high-voltage winding 5 via an inner insulating cylinder 6. It has been turned.
Tap winding support insulators 8 are provided on both upper and lower sides of the tap winding 7. The electrical loss of the tap winding 7, that is, the generated heat is smaller than that of the low-voltage inner winding 3 and the high-voltage winding 5.

Between the low-voltage winding 3 and the inner insulating cylinders 2 and 4, between the high-voltage winding 5 and the inner insulating cylinders 4 and 6, and between the tap winding 7 and the inner insulating cylinder 6 and the tank 13. Vertical ducts 20, 21, 22 are formed in each of the above. In this embodiment, the vertical ducts 20 and 21 have the cooling medium 1 directed from the inlet 23 at the inlet end toward the outlet 24 at the outlet end.
1 is circulated in the direction of the arrow to cool the windings 3 and 5 in the vertical ducts 20 and 21. On the other hand, the vertical duct 22 in which the tap winding 7 having a small electric loss is arranged is composed of an insulating member that closes the inlet of the vertical duct 22 between the insulating cylinder on the inlet end side of the vertical duct 22 and the tank 13. A partition plate 15 is provided so that the tap winding 7 is naturally cooled.

The partition plate 15 described above will be described with reference to FIG. As shown in the figure, the partition 15A is composed of 8 partitions 15A for easy assembly in manufacturing in this embodiment. Fig. 5 shows an example of another partition plate,
It shows an example in which a partition plate 15 divided into a three-phase tripod transformer is applied. Here, 1A is an iron core yoke that connects between the iron cores 1. Needless to say, the partition plate 15 may be an integrated plate.

Next, the cooling operation in this embodiment will be described. First, when the cooling medium 11 for cooling the transformer flows into the tank 13 from the outside, the cooling medium 11 flows from the inlet 23 to the vertical duct 20 in the lower portion of the tank 13.
It flows into 21. In the tap winding 7 having a small electric loss, since the partition plate 15 is provided in the vertical duct 22, the flow of the cooling medium 11 into the vertical duct 22 is cut off, and the electric loss is reduced by the cutoff amount. Large winding 3,5
The cooling medium 11 can be forced to flow into the chamber. Therefore,
The cooling efficiency of the windings 3 and 5 with large electrical loss is improved, the temperature rise of the windings in this portion is reduced, and the transformer and the cooling device can be made compact accordingly.

Further, since the cooling effect of the winding is enhanced, the size of the wire can be reduced, the current density of the winding can be increased, and the winding can be made compact. Further, as compared with the case where all the windings are forcibly cooled, the circulation flow rate of the cooling medium is small, so that the circulating medium drive device for the cooling medium can be saved.
From these facts, the entire transformer can be made compact by reducing the content body and weight.

In this embodiment, the partition plate 15 is shown in FIG.
As shown in (4), the partition 15A is divided into eight parts, but the essential point is that it is divided into a plurality of parts. If you divide it,
When arranging each partition 15A between the tank 13 and the inner insulating cylinder 6, dimensional adjustment, for example, partition 15A and partition 15
Even if A does not match, the dimensional adjustment can be easily adjusted by taking out and adjusting the partition plate of the integral body.

As shown in FIGS. 4A and 4B, the partition 1
A sealing member 15B made of a flexible material such as hard rubber is provided so as to close a gap 22A between the tank 5 and the tank 5A. One end side of the sealing member 15B is fixed to the partition piece 15A by the fixing means 15C, and the other end side presses the inner surface of the tank 13 so as to close the gap 22A.

If the sealing member 15B is provided as in this embodiment, the sealing member 15B is provided in the vertical duct 22 for the cooling medium 1.
1 can be prevented from flowing in from the inlet side, and the same effect as described above can be obtained.

Further, when the transformer main body is inserted into the tank 13 during manufacturing, when the partition plate 15 is used alone, the partition plate 15 may contact the inner surface of the tank 13 and damage the inner surface of the tank. However, in this embodiment, since the sealing member 15B made of a flexible material is provided, the inner surface of the tank 13 is less likely to be damaged.

In addition, the sealing member 15B allows the gap 22 to be formed.
Since A is closed and the inner surface of the tank 13 is pressed,
The magnetostrictive vibration generated during the operation of the transformer can be absorbed by the sealing member 15B, and the propagation of the vibration can be reduced.

Further, the other end of the sealing member 15B is formed near the fixing means 15C by forming a sloping sloping surface 15D whose cross-sectional area becomes wider as it goes from the fixing means 15C side toward the tank 13 side in the outlet direction. It is possible to easily remove the dust generated by the internal work during manufacturing, which easily collects near the sealing member 15B and on the upper surface of the partition plate 15.

In the embodiment shown in FIG. 6, the winding 30 having a smaller electric loss than the other windings 3 and 5, for example, the stable winding is formed by the inner core 1
Shows the case of arranging on the side, the inlet side of the vertical duct 31 in which the winding with small electric loss is arranged is closed by the partition plate 32, this part is naturally cooled, and the other winding is forced by the cooling medium 11. Even if it cools, the same effect as the above-mentioned embodiment can be expected.

[0023]

As described above, according to the present invention,
By being able to cool appropriately according to the function of each winding and the usage conditions, there is an effect that a compact static induction machine can be obtained.

[Brief description of drawings]

FIG. 1 is a partial side sectional view showing a transformer which is an embodiment of a static induction generator of the present invention.

FIG. 2 is an enlarged sectional view of a P part of FIG.

FIG. 3 is a schematic plan view showing an example of a partition adopted in the embodiment of FIG.

4 (A) and (B) are a plan view and a partial cross-sectional view showing details of a partition plate portion adopted in the embodiment of FIG.

FIG. 5 is a schematic plan view showing an example of a partition plate applied to a three-phase tripod transformer of the present invention.

FIG. 6 is a partial side sectional view showing a transformer which is another embodiment of the present invention.

FIG. 7 is a partial side sectional view showing a conventional transformer.

[Explanation of symbols]

1 ... Iron core, 2, 4, 6 ... Inner insulating cylinder, 3 ... Low-voltage winding, 5
... high-voltage winding, 7 ... tap winding, 8 ... tap winding supporting insulator, 9 ... insulator, 9a ... insulator collar 10, ... tap winding outer insulating cylinder, 11, 16 ... cooling medium, 12 ... Stopper, 13 ... Tank, 14 ... Cooling device, 15, 32 ... Partition plate, 15A ... Partition piece, 15B ... Sealing member, 17 ... Iron core tightening metal fitting, 18 ... Iron core pushing bolt, 19 ... Insulator ring,
20, 21, 22, 31 ... Vertical duct, 22A ... Gap,
23 ... Inlet, 24 ... Outlet 25 ... Insulator piece, 30 ... Winding with small electrical loss.

Claims (6)

[Claims] 1. An iron core is arranged in a tank, a plurality of windings are arranged between the iron core and the tank, and between the iron core and the winding, between the windings, and between the winding and the tank. An insulating cylinder is installed between each of the windings, and a vertical duct is formed between the insulating cylinder and each of the windings. In a static induction electric device having at least one small winding and circulating a cooling medium from an inlet end to an outlet end of the vertical duct to cool each winding, the winding having a small electric loss is housed. A static induction electric device characterized in that an inlet of the vertical duct is closed at the inlet end of the vertical duct, and a partition plate is provided so that the cooling medium does not flow in. 2. An iron core is arranged in a tank, a plurality of windings are arranged between the iron core and the tank, and between the iron core and the windings, between the windings, and between the windings and the tank. An insulating cylinder is installed between each of the windings, and a vertical duct is formed between the insulating cylinder and each of the windings. In a static induction electric device having at least one small winding and circulating a cooling medium from an inlet end to an outlet end of the vertical duct to cool each winding, the winding having a small electric loss is housed. A partition plate extending to the tank side is provided in the insulating tube on the inlet end side of the vertical duct, and a partition plate sealing member is formed so as to form a gap between the partition plate and the tank and close the gap so that the cooling medium does not flow in. Is provided between the insulating cylinder and the tank. Characteristic stationary induction machine. 3. The static induction electric machine according to claim 1, wherein the winding having a small electric loss is located at the outermost circumference of the plurality of windings. 4. The static induction electric machine according to claim 1, wherein the winding having the small electric loss is located at the innermost circumference of the plurality of windings. 5. The static induction electric device according to claim 1, wherein the partition plate is divided into a plurality of parts. 6. The other end side of the sealing member provided on the partition plate is provided with an inclined surface that presses the tank and expands toward the tank side from the partition plate side. Item 3. The static induction electric device according to item 2.