JPH11288820A - Static induction electric device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling efficiency and to prevent local overheating with a supporting metal tool by forming a cooling flow path at a part of the supporting metal tool which is inserted between the main body of a transformer and the bottom plate of a tank and an insulating spacer. SOLUTION: A cooling flow path 40 is provided at one place at a supporting metal tool 10, which is inserted between the main body of a transformer and a tank-bottom plate 9a. Even if leaking magnetic flux from an inner winding 5 and an outer winding 6 into the supporting metal tool 10 and the loss is generated, transformer coil flows in the cooling flow path 40, and cooling can be performed efficiently since the cooling flow path 40 is formed at the supporting metal tool 10. Therefore, the local overheating at the supporting metal tool 10 can be prevented. The provision of the cooling flow path 40 to the supporting metal tool 10 is determined by the intensity computation and the like. Since the supporting metal tool 10 is mainly a magnetic body (steel plate), the cooling flow path 40 is provided by processing a part of the steel plate, or an ordinary U-shape type and H-type steel plate can be used. With the insulating spacer 20, which is inserted between the supporting metal tool 10 and the tank bottom prate 9a, the cooling flow path 40 is provided at one side surface, in contact with the supporting metal tool 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction device such as a transformer or a reactor, and more particularly to a static induction device having a cooling passage for preventing local overheating due to magnetic flux leaking from windings.

[0002]

2. Description of the Related Art In recent years, transformers have tended to have larger capacities, and accordingly, leakage flux from windings has also increased. Prevention of the local temperature rise of the transformer structure with the increase of the leakage magnetic flux is regarded as a problem from the viewpoint of performance, durability and the like.

[0003] A support fitting for supporting a stationary induction device such as a transformer to a tank is also one example. Therefore, a single-phase center core transformer will be described as an example with reference to FIGS. FIG. 9 is a side view showing the internal configuration of the transformer, and FIG. 10 is a front view showing the internal configuration of the transformer. In the figure, 1, 2
Are iron core legs and side legs having upper and lower yoke portions 3 and 4
And 6 are inner and outer windings wound around the core leg 1,
Reference numeral 8 denotes upper and lower clamps, which clamp the upper yoke 3 with the upper clamp 7 and the lower yoke 4 with the lower clamp 8 in the horizontal direction.

[0004] The transformer main body constructed as described above is housed in a tank 9 composed of a tank bottom plate 9a, a tank side plate 9b, and a tank cover 9c, and the transformer main body is supported on the tank bottom plate 9a and is electrically insulated. For this purpose, a plurality of support fittings 10 and insulating spacers 20 are provided.

However, in the conventional transformer having such a configuration, a part of the leakage magnetic flux 30 from the inner winding 5 and the outer winding 6 is indicated by an arrow in FIG. 4 and enters the vicinity of the support fitting 10 supporting the above-mentioned transformer body. As a result, local loss occurs in the support fitting 10, which causes a local temperature rise, which causes a reduction in the reliability and efficiency of the transformer.

[0006]

In the above-mentioned prior art static induction device, the magnetic flux leaking from the windings penetrates into the support fitting for supporting the transformer body, causing a loss, thereby preventing local overheating in the support fitting. There were issues to be solved about the structure.

[0007] An object of the present invention is to effectively solve such problems of the prior art, and an object of the present invention is to provide a cooling channel in a supporting bracket and an insulating spacer inserted between a transformer main body and a tank bottom plate. To improve cooling efficiency,
An object of the present invention is to provide a static induction device that prevents local overheating of a support bracket.

[0008]

SUMMARY OF THE INVENTION The present invention comprises an iron leg having upper and lower yoke portions, and a winding wound around the iron leg.
In order to support the transformer main body in which the core tightening brackets parallel to the longitudinal direction are arranged on the side surfaces of the upper and lower yoke portions, respectively, a supporting bracket and an insulating spacer are inserted between the transformer main body and the tank bottom plate to transform the transformer. A stationary induction device in which a container main body is housed in a tank, wherein a cooling channel is formed in a part of the support bracket and the insulating spacer. That is, according to the stationary induction device of the present invention, a cooling flow path is formed in the support fitting and the insulating spacer, and a cooling medium is caused to flow through the cooling flow path, so that the leakage magnetic flux from the winding enters the support fitting. Since it is possible to efficiently cool the generated loss, it is possible to prevent local overheating at the support fitting.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a main part showing an internal configuration of a transformer. Note that the same reference numerals are used for the same components as those in the related art. As can be seen from the figure, the transformer body and the tank bottom plate 9a
And a cooling flow passage 40 is provided in the support fitting 10 inserted between them.

According to this configuration, the leakage flux 30 (not shown) from the inner winding 5 and the outer winding 6 is applied to the support fitting 1.
Even if a loss occurs due to intrusion into the cooling water, the transformer oil 50 (not shown) flows through the cooling flow passage 40 because the cooling flow passage 40 is formed in the support fitting 10 so that efficient cooling is possible. Therefore, local overheating in the support fitting 10 can be prevented. Note that the area of the cooling channel 40 needs to be such that the support fitting 10 is not deformed when the transformer main body is supported.

Therefore, the cooling flow path 40 to the support fitting 10
It is necessary to determine the securement by calculating the strength. Since the support fitting 10 is mainly made of a magnetic material (steel plate), a part of the steel plate may be processed to provide the cooling passage 40, or a normal U-shaped and H-shaped steel plate may be used. Further, in the present invention, the case where one cooling channel 40 is provided in the support fitting 10 is described as an example, but it goes without saying that the same effect can be expected even when a plurality of cooling channels 40 are provided.

FIG. 2 is a front view showing the internal configuration of a transformer in a static induction device according to another embodiment of the present invention. In the figure, the same parts as those shown in FIG. 1 are denoted by the same reference numerals.
As can be seen from the drawing, a cooling channel 40 is provided on one side in contact with the support fitting 10 by an insulating spacer 20 inserted between the support fitting 10 and the tank bottom plate 9a.

According to this configuration, since the cooling channel 40 is provided on one surface of the insulating spacer 20 that is in contact with the support fitting 10, a transformer oil 50 (not shown) for cooling the support fitting 10 is provided. Flows, it is possible to prevent local overheating in the support fitting 10. The insulating spacer 20 may be manufactured by bonding an insulating protrusion 20b to one surface of the insulating material 20a. In addition, the work of providing the cooling flow passage 40 in the insulating spacer 20 is easier than the work of processing a normal steel plate, and it is possible to manufacture an inexpensive one.

FIG. 3 is a cross-sectional view of a main part of a stationary induction device according to another embodiment of the present invention, similar to FIG. In the figure, the same parts as those shown in FIG. 1 are denoted by the same reference numerals. As can be seen from the drawing, a cooling channel 40 is provided on each side of the insulating spacer 20 which is inserted between the support fitting 10 and the tank bottom plate 9a, in contact with the support fitting 10 and the tank bottom plate 9a. .

According to this configuration, since the cooling channels 40 are provided on both sides of the insulating spacer 20 in contact with the support fitting 10, the transformer oil 50 (for cooling the support fitting 10 and the tank bottom plate 9a) is provided. (Not shown) flows, it is possible to prevent local overheating in the support fitting 10 and the tank bottom plate 9a, and it is possible to suppress a reduction in reliability and efficiency of the transformer. Also, the insulating spacer 20 can be manufactured by bonding the insulating protrusions 20b to both surfaces of the insulating material 20a, or by bonding two insulating protrusions 20b to one surface of the insulating material 20a. .

FIG. 4 is a cross-sectional view of a main part of a static induction device according to another embodiment of the present invention, similar to FIG. In the figure, the same parts as those shown in FIG. 1 are denoted by the same reference numerals. As can be seen from the drawing, three cooling channels 40 are provided on both surfaces of the insulating spacer 20 inserted between the support fitting 10 and the tank bottom plate 9a in contact with the support fitting 10 and the tank bottom plate 9a.

According to this configuration, since the three cooling channels 40 are provided on both surfaces of the insulating spacer 20 in contact with the support fitting 10, the support fitting 10 and the tank bottom plate 9a are provided.
Since the transformer oil 50 (not shown) for cooling the cooling medium flows over a wide range, it is possible to prevent local overheating in the support fitting 10 and the tank bottom plate 9a. Further, since the cooling channels are provided at a plurality of locations, the cooling efficiency is improved, and the temperature rise in the width direction of the support fitting 10 and the tank bottom plate 9a can be made uniform, thereby suppressing local overheating. In addition,
Although the present invention describes the case where the cooling channel 40 is formed in each of the support fitting 10 and the insulating spacer 20, the present invention is also applicable to a case where the cooling channel 40 is formed in combination with the support fitting 10 and the insulating spacer 20. Needless to say, similar effects can be expected.

FIGS. 5 and 6 are cross-sectional views of a stationary induction device according to another embodiment of the present invention. FIG. 5 is a side view showing the internal configuration of the transformer, and FIG. 6 is a front view showing the internal configuration of the transformer. In the figure, the same parts as those shown in FIG. 1 are denoted by the same reference numerals. As can be seen from the figure, the lower fastening member 8 is box-shaped, and four gaps 60 are provided in a part of the vertical plate 8a of the lower fastening member 8 facing the tank side plate 9b and the supporting member 10, and A part of the transformer oil 50 that has flowed through the fastening fitting 8 by forced cooling flows through the gap 60 to the support fitting 10 and the tank bottom plate 9a.

According to such a configuration, even if a part of the leakage magnetic flux 30 from the inner winding 5 and the outer winding 6 enters the supporting metal as shown by the arrow and causes a loss, the lower fastening metal is used. A gap portion 60 is provided in a part of the vertical plate 8a of FIG. 8, and a part of the transformer oil 50 flowing by forced cooling in the lower fastening member 8 flows to the support member 10 and the tank bottom plate 9a for cooling. Local overheating can be prevented. In the vicinity of the side leg 2 where the inner winding 5 and the outer winding 6 are not wound, since the loss caused by the leakage magnetic flux 30 is small, the same effect can be obtained even if the gap 60 is omitted. Although the case where the material of the vertical plate 8a is a steel plate is described as an example, the same effect can be expected even if the vertical clamp 8 is formed of an insulator if the transformer oil flows forcibly through the lower fastener 8. Needless to say.

FIGS. 7 and 8 are cross-sectional views of a stationary induction device according to another embodiment of the present invention. 7 is a side view showing the internal configuration of the transformer, and FIG. 8 is a front view showing the internal configuration of the transformer. The same parts as those shown in FIGS. 5 and 6 are denoted by the same reference numerals. As can be seen from the figure, the lower fastening member 8 has a box shape, is in a range where the inner winding 5 and the outer winding 6 are wound, and includes the tank side plate 9b and the support fitting 1.
Two nozzles 70 are provided at a part of the vertical plate 8a of the lower fastener 8 opposite to the part 0, and a part of the transformer oil 50 flowing by forced cooling in the lower fastener 8 passes through the nozzle 70. And flows to the support fitting 10 and the tank bottom plate 9a.

According to this configuration, even if a part of the leakage magnetic flux 30 from the inner winding 5 and the outer winding 6 penetrates into the support fitting 10 as shown by an arrow and a loss occurs, the lower part is fastened. A nozzle 70 is provided on a part of the vertical plate 8a of the metal fitting 8, and a part of the transformer oil 50 flowing through the lower fastening metal 8 by forced cooling is blown to the supporting metal 10 and the tank bottom plate 9a. And the tank bottom plate 9a can be effectively cooled, so that local overheating can be prevented. In addition, support bracket 1
At the mounting position of 0, it is possible to spray a large amount of transformer oil 50 to a portion where the loss is locally concentrated by analysis such as magnetic field calculation. The present invention shows an example in which the gap 60 and the nozzle 70 are provided in a part of the vertical plate 8a of the lower fastening member 8, but the cooling passage 4 is provided in the support member 10, the insulating spacer, and the like.
It goes without saying that a similar effect can be expected even when combined with an object provided with 0.

Although the present invention has been described by taking the transformer oil 50 as an example of the cooling medium, the same effect can be expected even when an insulating gas (SF ₆ gas) or perfluorocarbon (PFC) is used. Needless to say. The present invention also provides a single-phase two-leg, single-phase four-leg, three-phase three-leg, and three-phase five with increased windings and iron cores.
Similar effects can be expected for leg transformers.

Although FIGS. 1 to 8 have been described with reference to the transformer, the present invention can be applied to a reactor, and the effect can be expected in the same manner as the transformer described above.

[0025]

According to the stationary induction device of the present invention,
By forming a cooling channel in the support bracket and the insulating spacer, and flowing a cooling medium through the cooling channel, it is possible to efficiently cool the loss generated by the leakage magnetic flux from the windings entering the support bracket. Therefore, local overheating of the support bracket can be prevented.

[Brief description of the drawings]

FIG. 1 is an internal cross-sectional view of a stationary induction device showing one embodiment of the present invention.

FIG. 2 is an internal cross-sectional view of the stationary induction device showing one embodiment of the present invention.

FIG. 3 is a cross-sectional view of an internal main part of a stationary induction device showing one embodiment of the present invention.

FIG. 4 is a cross-sectional view of an essential part of a static induction device showing one embodiment of the present invention.

FIG. 5 is an internal side view of the stationary induction device showing one embodiment of the present invention.

FIG. 6 is an internal front view of the stationary induction device showing one embodiment of the present invention.

FIG. 7 is an internal side view of the stationary induction device showing one embodiment of the present invention.

FIG. 8 is an internal side view of the stationary induction device showing one embodiment of the present invention.

FIG. 9 is a side view showing the internal structure of a transformer of a conventional support bracket for fixing a transformer main body.

FIG. 10 is a front view showing a conventional internal structure of a transformer of a supporting bracket for fixing a transformer main body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Iron leg, 2 ... Side leg, 3 ... Upper yoke part, 4 ... Lower yoke part, 5 ... Inner winding, 6 ... Outer winding, 7 ... Upper fastening metal fitting,
Reference numeral 8: lower fastening fitting, 8a: vertical plate of lower fastening fitting, 9: tank, 9a: tank bottom plate, 9b: tank side plate, 9c: tank cover, 10: support fitting, 20: insulating spacer, 2
0a: insulator, 20b: protrusion, 30: magnetic flux leakage, 40:
Cooling channel, 50: transformer oil, 60: gap, 70: nozzle.

Claims (6)

[Claims] An iron core having upper and lower yoke portions, and windings wound around the iron core legs, and core fastening members parallel to the longitudinal direction are arranged on side surfaces of the upper and lower yoke, respectively. A cooling channel is formed in a part of the support bracket in a case where a support bracket and an insulating spacer are inserted between the transformer body supporting the transformer body and the tank bottom plate to house the transformer body in the tank. A static induction device characterized by the following. 2. An iron core having upper and lower yoke portions, and a winding wound around the iron core legs, and core fastening members parallel to the longitudinal direction are arranged on side surfaces of the upper and lower yoke, respectively. A cooling channel is formed in a part of the insulating spacer in a case where a supporting body and an insulating spacer are inserted between a transformer main body that supports the transformer main body and a tank bottom plate to house the transformer main body in the tank. A static induction device characterized by the following. 3. A cooling channel is provided on both sides of an insulating spacer inserted between the transformer body and the tank bottom plate to cool both the support bracket and the tank bottom plate. The static induction device as described. 4. The cooling device according to claim 1, wherein a plurality of cooling channels are provided on both sides of the insulating spacer inserted between the transformer main body and the tank bottom plate to cool both the support bracket and the tank bottom plate. Item 3. The static induction device according to Item 2. 5. An iron core having upper and lower yoke portions and windings wound around the iron core legs, and core fastening members parallel to the longitudinal direction are disposed on side surfaces of the upper and lower yoke portions, respectively. In order to accommodate the transformer main body, a supporting bracket and an insulating spacer are inserted between the transformer main body and the tank bottom plate to house the transformer main body in the tank, and a hole is provided in the lower fastening bracket. A stationary induction device characterized in that a part of a cooling medium is caused to flow to a support bracket or a tank bottom plate. 6. The stationary induction electric device according to claim 5, wherein a nozzle is provided in the lower fastening member so that a part of the cooling medium is blown to the supporting member and the tank bottom plate.