JP4282123B2 - Magnetic shield type static induction machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetically shielded static induction device such as a transformer or a reactor provided with a magnetic shield body on the inner wall of a tank in order to prevent the tank from being locally overheated by magnetic flux leaking from a winding.
[0002]
[Prior art]
5 and 6 show the structure of a transformer as a conventional magnetic shield type static induction generator of this type.
[0003]
For example, in an ultra-high voltage and large capacity transformer such as a 500 kV transformer, because the insulation and transportation conditions are severe, the tank side wall may be bent and widened as shown.
[0004]
Such a transformer includes a widened tank 1 having a bent portion 1A, and a transformer main body 4 as a static induction electric main body housed in the tank 1 and wound with a winding 3 around an iron core 2. And a magnetic shield body 5 provided along the bent inner wall of the tank 1. The magnetic shield body 5 has a length along the height direction of the tank 1 and is formed of a laminated body of a plurality of magnetic shield plates having a predetermined width in the circumferential direction of the tank 1. As the magnetic shield plate, a silicon steel plate having a thickness of about 0.5 mm is used. The magnetic shield body 5 is formed by being bent as a bent portion 5A at a position corresponding to each bent portion 1A of the tank 1 so as to be along the inner wall of the bent tank 1, and is vertically formed on the inner wall of the tank 1. Along the circumferential direction of the tank 1, a predetermined gap 6 is provided in parallel.
[0005]
When a plurality of magnetic shield bodies 5 are arranged side by side along the inner wall of the tank 1 in this way, the magnetic flux generated from the transformer body 4 flows in a concentrated manner in each magnetic shield body 5 having a small magnetic resistance, It is possible to prevent a large amount of magnetic flux from flowing through the tank 1. In this case, almost no magnetic flux passes through the gap 6 between the magnetic shield bodies 5 adjacent to each other in the circumferential direction of the tank 1, so that the magnetic flux is concentrated on the left and right magnetic shield bodies 5, so Local heat generation due to eddy current in the portion of the tank 1 corresponding to the gap 6 between the shield bodies 5 is not problematic.
[0006]
However, the magnetic shield body 5 uses a thin steel plate as a magnetic shield plate, and several tens of these are laminated to ensure a required thickness. Therefore, the magnetic shield body 5 is swollen or displaced at the bent portion 5A of the magnetic shield body 5. Thus, there is a problem that it is difficult to obtain the dimensional accuracy of the bent portion 5A and it takes a lot of work.
[0007]
In order to solve this problem, as shown in FIG. 7, the magnetic shield body 5 is divided into upper and lower divided bodies 5 </ b> B at each bent portion 5 </ b> A, and these divided bodies 5 </ b> B are spaced from the inner wall of the tank 1. It is proposed that the end surfaces of the tanks 1 are arranged so as to face each other up and down via a gap 8 at locations corresponding to the bent portions 1 </ b> A of the tank 1.
[0008]
When the magnetic shield body 5 is configured by dividing the upper and lower sides in this way, the magnetic shield body 5 can be easily formed even in the tank 1 having the bent portion 1A.
[0009]
[Problems to be solved by the invention]
However, in the transformer using the magnetic shield body 5 divided vertically as shown in FIG. 7, the magnetic shield body 5 is placed on the magnetic shield body 5 because the magnetic flux is concentrated in the vertical direction. The magnetic flux leaks to the tank 1 side from the gaps 8 at the opposing portions of the ends of the vertically adjacent divided bodies 5B, and local portions due to eddy currents in the portion of the tank 1 facing these gaps 8 There was a problem of overheating.
[0010]
It is an object of the present invention to provide a magnetic shield type stationary that can prevent local overheating from occurring in a tank portion corresponding to each gap between the ends of the vertically adjacent divided bodies constituting the magnetic shield body. It is to provide an induction machine.
[0011]
Another object of the present invention is to provide a magnetic shield type static induction electric appliance that can easily handle an improved magnetic shield body and can suppress the generation of eddy currents in a magnetic shield plate that is not divided vertically. is there.
[0012]
[Means for Solving the Problems]
The present invention relates to a tank having a bent portion, a stationary induction electric appliance body housed in the tank and wound with a winding around an iron core, a predetermined gap in the inner wall of the tank, and the bent portion of the tank The magnetic shield body is formed by a laminated body of a plurality of magnetic shield plates, and each magnetic shield plate is an appropriate portion in the height direction. And improving the magnetic shield type static induction electric device which is divided into a plurality of divided bodies vertically.
[0013]
In the magnetic shield type static induction electric appliance according to the present invention, the inner surfaces of the plurality of divided bodies constituting the magnetic shield body facing the static induction electric body are collectively covered with a magnetic shield plate that is not divided vertically. ing.
[0014]
Thus, if the inner surface of the magnetic shield body facing the stationary induction body is covered with a magnetic shield plate that is not divided into upper and lower parts, the gap between the magnetic shield body and the magnetic shield plate that are divided into upper and lower parts also becomes magnetic. Since it is covered with the shield plate, it is possible to prevent local overheating from occurring in the portion of the tank facing the gap, and local overheating of the magnetic shield body at the gap. Further, according to the present invention, the magnetic shield plate that is not divided vertically is present on the inner surface of the magnetic shield body on the side facing the winding of the stationary induction main body, so that it is divided into a plurality of pieces vertically. Since the corner portion of the opposite end portion of the magnetic shield plate is not exposed to the electric field with respect to the winding, electric field relaxation can be achieved. In addition, there is a gap between the inner wall of the tank and the magnetic shield body, allowing insulation oil to flow therethrough, increasing the cooling effect of the magnetic shield body and suppressing local overheating of the tank on this surface as well. can do.
[0015]
The present invention also provides a tank having a bent portion, a stationary induction electric device body housed in the tank and wound around an iron core, a predetermined gap in the inner wall of the tank, and the bending of the tank. And a magnetic shield body provided by bending at a bent portion corresponding to the portion, the magnetic shield body is formed by a laminated body of a plurality of magnetic shield plates, and each magnetic shield body corresponds to a bent portion of the tank Thus, a magnetic shield type static induction electric device that is divided into a plurality of divided bodies vertically is improved.
[0016]
In the magnetic shield type static induction electric appliance according to the present invention, the inner surfaces of the plurality of divided bodies constituting the magnetic shield body facing the static induction electric body are collectively covered with a magnetic shield plate that is not divided vertically. ing.
[0017]
When the inner surface of the magnetic shield body that is divided into a plurality of divided bodies facing the stationary induction electric body is covered with a magnetic shield plate that is not divided vertically, a gap between the magnetic shield bodies divided vertically Since this is covered with this magnetic shield plate, it is possible to prevent local overheating from occurring in the portion of the tank facing the gap. Further, according to the present invention, the magnetic shield plate that is not divided into upper and lower portions is present on the inner surface of the magnetic shield body facing the winding of the stationary induction electric appliance body, so that it is divided into a plurality of pieces in the vertical direction. Since the corner portion of the opposing end portion of the divided body of the magnetic shield body is not exposed to the electric field with respect to the winding, electric field relaxation can be achieved. In addition, there is a gap between the inner wall of the tank and the magnetic shield body, allowing insulation oil to flow therethrough, increasing the cooling effect of the magnetic shield body and suppressing local overheating of the tank on this surface as well. can do.
[0018]
In the present invention, it is preferable that the gap between the inner wall of the tank and the magnetic shield body is larger than the gap between the upper and lower divided bodies of the magnetic shield body. When the relationship between the sizes of the gaps is determined in this way, the magnetic flux that is concentrated in the vertical direction on the magnetic shield body is transferred to the tank side at the gap between the upper and lower divided bodies of the magnetic shield body. Therefore, it is possible to prevent the tank from being overheated locally by an eddy current caused by a leakage magnetic flux. Further, if there is a relatively large gap between the inner wall of the tank and the magnetic shield body, the cooling effect of the magnetic shield body can be enhanced, and local overheating of the tank can be suppressed also in this aspect.
[0019]
In these inventions, when a plurality of magnetic shield bodies are provided, and the plurality of magnetic shield bodies are arranged side by side in the circumferential direction of the inner wall of the tank with a vertical gap between them, it is divided vertically. The unshielded magnetic shield plate is preferably provided with a width substantially equal to the width of the magnetic shield body.
[0020]
If comprised in this way, the horizontal width of the magnetic shield board which is not divided | segmented up and down and the horizontal width of the magnetic shield body which overlaps this will become substantially the same, Since both can be handled as an integrated object, handling becomes easy. In addition, since the width of the magnetic shield plate that is not divided into upper and lower portions becomes relatively narrow in accordance with the width of the magnetic shield body, generation of eddy currents can be suppressed.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a first example of an embodiment in which a magnetic shield type static induction electric appliance according to the present invention is applied to a transformer, and FIG. 1 is provided on a tank and its inner wall in the transformer of this example. The principal part longitudinal cross-sectional view which shows the structure of a magnetic shield body, FIG. 2 is an enlarged view of the A section of FIG. Note that portions corresponding to those in FIGS. 5 and 6 described above are denoted by the same reference numerals.
[0022]
In the transformer of this example, the magnetic shield body 5 is provided along the bent inner wall of the widened tank 1 having a plurality of bent portions 1A and with a predetermined gap 7 with respect to the inner wall. As shown in FIG. 6, the magnetic shield bodies 5 are juxtaposed in the circumferential direction of the inner wall of the tank 1 with a gap 6 in the vertical direction, and each magnetic shield body 5 corresponds to each bent portion 1A of the tank 1. Each of the bent portions 5A is bent and divided into a plurality of divided bodies 5B vertically by gaps 8 at the bent portions 5A. The divided bodies 5B are a plurality of pieces of silicon steel plate having a thickness of about 0.5 mm. The point formed by the laminated body of the magnetic shield plates is the same as the conventional example shown in FIG.
[0023]
In the transformer of this example, the inner surface facing the transformer body 4 of the magnetic shield body 5 that is divided into a plurality of divided bodies 5B up and down at locations corresponding to the bent portion 1A of the tank 1 is It is covered with one or a plurality of magnetic shield plates 9 made of a silicon steel plate having a thickness of about 0.5 mm that is not divided into two. The horizontal width of the magnetic shield plate 9 is set substantially equal to the horizontal width of the divided body 5B. The number of the magnetic shield plates 9 used in such a manner is a number that can provide dimensional accuracy even if bending is performed at a location corresponding to the bent portion 1A of the tank 1, and the thickness of the magnetic shield plate 9 is Depending on the factor, it is about 2 to 10 sheets.
[0024]
Further, the gap 7 between the inner wall of the tank 1 and the magnetic shield body 5 is set to be larger than the gap 8 between the divided bodies 5B facing vertically.
[0025]
Other configurations of the transformer of this example are the same as those of the conventional example described above.
[0026]
Thus, when the inner surface facing the transformer body 4 of the magnetic shield body 5 that is divided into the plurality of divided bodies 5B in the vertical direction is covered with the magnetic shield plate 9 that is not divided in the vertical direction, the magnetic shield body 5 is divided in the vertical direction. Since the gap 8 at the location of the magnetic shield body 5 is also covered with the magnetic shield plate 9, local overheating can be prevented from occurring in the portion of the tank 1 that faces the gap 8. Further, the magnetic shield plate 9 that is not divided vertically is present on the inner surface of the magnetic shield body 5 on the side facing the winding 3 (see FIG. 5) of the transformer body 4, so that the adjacent divided body 5B. Since the corner portions of the opposite end portions are not exposed to the winding 3 in an electric field, the electric field can be relaxed.
[0027]
Further, if the gap 7 between the inner wall of the tank 1 and the magnetic shield body 5 is larger than the gap 8 between the upper and lower divided bodies 5B of the magnetic shield body 5, the magnetic shield body 5 has a vertical direction. Can be prevented from flowing to the tank 1 side at the gap 8 between the upper and lower divided bodies 5B of the magnetic shield body 5, and thus the vortex caused by the leakage magnetic flux can be suppressed. It is possible to prevent the tank 1 from being locally overheated by an electric current. Further, if there is a relatively large gap 7 between the inner wall of the tank 1 and the magnetic shield body 5, the insulating oil flowing here can enhance the cooling effect of the circulating magnetic shield body, It can also be suppressed on the surface.
[0028]
3A and 3B show an example of a structure in which the divided body 5B is installed with a gap 7 between the inner wall of the tank 1 and the divided body 5B of the magnetic shield body 5. FIG. A) is a front view of the spacer unit 10 used in this example, and FIG. 3B is a gap 7 between the inner wall of the tank 1 and the divided body 5B of the magnetic shield body 5 using the spacer unit 10. It is a longitudinal cross-sectional view which shows the example.
[0029]
The spacer unit 10 used in this example includes a spacer collective mounting plate 11 made of a press board having the length and width of the magnetic shield body 5, and the press board is vertically spaced at a predetermined interval on one plate surface of the spacer collective mounting plate 11. The spacer 12 made of the laminated body is attached obliquely. The spacer unit 10 is provided with a mounting hole 13 through the spacer batch mounting plate 11 and the spacer 12 at the position of the spacer 12 at a predetermined interval in the vertical direction.
[0030]
On the other hand, bolts 14 are implanted on the inner wall of the tank 1 by welding or the like at intervals of the mounting holes 13 of the spacer unit 10. Mounting holes 15 are also formed at intervals between the mounting holes 13 of the spacer unit 10 in the divided body 5B constituting the magnetic shield body 5 and the magnetic shield plate 9 which is not divided vertically.
[0031]
When attaching the magnetic shield 5 to the inner wall of the tank 1, the spacers 12 are first fitted to the bolts 14 so that the spacers 12 face the inner wall of the tank 1. As shown in FIG. 3 (B), it is brought into contact with the inner wall of the tank 1. Next, the respective divided bodies 5B constituting the magnetic shield body 5 are arranged so as to leave a gap 8 between adjacent ones, and the respective mounting holes 15 of the respective divided bodies 5B are fitted into the respective bolts 14, and the respective divided bodies 5B are arranged as spacers. Overlay the spacer batch mounting plate 11 of the unit 10. Next, the mounting holes 15 of the magnetic shield plate 9 that are arranged across the divided bodies 5B and are not divided vertically are fitted into the bolts 14, and the magnetic shield plates 9 are overlaid on the divided bodies 5B. In this state, the magnetic shield plate 9 and the magnetic shield body 5 are fixed to the inner wall of the tank 1 by fastening the nut 16 having a round head from the magnetic shield plate 9 side to each bolt 14.
[0032]
With such a structure, each spacer 12 is attached to the spacer collective mounting plate 11, so that the spacer 12 can be attached efficiently. Further, each spacer 12 is disposed obliquely so that one end side in the width direction of the spacer collective mounting plate 11 is on the upper side and the other end side is on the lower side, so that a gap 7 between the inner wall of the tank 1 and the magnetic shield body 5 is provided. The insulating oil is not prevented from circulating as the temperature rises.
[0033]
FIG. 4 is a longitudinal sectional view of an essential part showing a structure of a magnetic shield body provided on a tank and its inner wall in a second example of an embodiment in which the magnetic shield type static induction electric device according to the present invention is applied to a transformer. The parts corresponding to those in FIG. 2 are given the same reference numerals.
[0034]
In the transformer of this example, the magnetic shield body 5 disposed with a gap 7 with respect to the inner wall of the tank 1 is formed by a laminated body of a plurality of magnetic shield plates 5C, and these magnetic shield plates 5C are high. The magnetic shield plate 5C is laminated in such a manner that the gap 8 at the divided portion of one magnetic shield plate 5C is closed by the adjacent magnetic shield plate 5C. That is, the divided portions of each magnetic shield plate 5C of the magnetic shield body 5 have a structure in which step lap bonding is performed. The inner surface of the magnetic shield body 5 having such a layer structure facing the transformer body 4 is also covered with a magnetic shield plate 9 that is not divided vertically.
[0035]
Thus, when the inner surface of the magnetic shield body 5 facing the transformer body 4 is covered with the magnetic shield plate 9 that is not divided into upper and lower portions, the gap 8 at the location of the magnetic shield plate 5C divided into the upper and lower portions also becomes magnetic. Since it is covered with the shield plate 9, it is possible to prevent local overheating from occurring in the portion of the tank 1 that faces the gap 8, and local overheating of the magnetic shield body 5 at the gap 8.
[0036]
In addition, the magnetic shield plate 9 that is not divided vertically is present on the inner surface of the magnetic shield body 5 on the side facing the winding 3 of the transformer body 4, so that the magnetic shield is divided into a plurality of pieces vertically. Since the corner portion of the opposite end of the plate 5C is not exposed to the winding 3 in an electric field, the electric field can be relaxed. Further, since a gap 7 exists between the inner wall of the tank 1 and the magnetic shield body 5 so that insulating oil can flow therethrough, the cooling effect of the magnetic shield body 5 is increased, and the local overheating of the tank 1 is increased. Can also be suppressed in this aspect.
[0037]
In the above example, the case where the present invention is applied to a magnetic shield type static induction electric machine composed of a magnetic shield type transformer has been shown. However, the present invention applies to a magnetic shield type static induction electric apparatus composed of a magnetic shield type reactor in the same manner. Can be applied.
[0038]
【The invention's effect】
In the magnetic shield type static induction electric appliance according to the present invention, the inner surface facing the stationary induction electric appliance main body of the plurality of divided bodies constituting the magnetic shield body is covered with a magnetic shield plate that is not divided vertically, A plurality of divided bodies constituting the magnetic shield body and gaps between the plurality of divided bodies can be covered with this magnetic shield plate, and local overheating occurs in the portion of the tank facing the gap, or the location of the gap Thus, it is possible to prevent the magnetic shield body from overheating locally. Further, according to the present invention, the magnetic shield plate that is not divided into upper and lower portions is present on the inner surface of the magnetic shield body facing the winding of the static induction electric appliance body, so that a plurality of magnetic shield bodies are formed. Since the corner portions of the opposed end portions of the divided body are not exposed to the windings in an electric field, electric field relaxation can be achieved. In addition, there is a gap between the inner wall of the tank and the magnetic shield body, allowing insulation oil to flow therethrough, increasing the cooling effect of the magnetic shield body and suppressing local overheating of the tank on this surface as well. can do.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing the structure of a magnetic shield body provided on a tank and its inner wall in a first example of an embodiment in which a magnetic shield type static induction electric device according to the present invention is applied to a transformer.
FIG. 2 is an enlarged view of part A in FIG.
FIGS. 3A and 3B show an example of a structure in which the divided body is installed with a gap between the inner wall of the tank and the divided body of the magnetic shield body. FIG. FIG. 5B is a longitudinal sectional view showing an example in which a gap is formed between the inner wall of the tank and the divided body of the magnetic shield body using the spacer unit.
FIG. 4 is a longitudinal sectional view of an essential part showing a structure of a magnetic shield body provided on a tank and an inner wall in a second example of an embodiment in which a magnetic shield type static induction electric device according to the present invention is applied to a transformer.
FIG. 5 is a longitudinal sectional view of a transformer as a conventional magnetic shield type static induction electric device.
6 is a perspective view showing an inner surface structure of a portion B in FIG. 5. FIG.
FIG. 7 is a longitudinal sectional view of a transformer as a conventional magnetic shield type static induction electric device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tank 1A Bending part 2 Iron core 3 Winding 4 Transformer main body 5 Magnetic shield body 5A Bending part 5B Divided body 5C Magnetic shield plate 6, 7, 8 Crevice 9 Magnetic shield plate 10 Spacer unit 11 Spacer collective attachment plate 12 Spacer 13 Attachment Hole 14 Bolt 15 Mounting hole

Claims (4)

A tank having a bent portion, a stationary induction electric device body housed in the tank and wound around an iron core, a predetermined gap in the inner wall of the tank, and corresponding to the bent portion of the tank. The magnetic shield body is formed of a laminate of a plurality of magnetic shield plates, and each magnetic shield plate has a plurality of upper and lower portions at appropriate locations in the height direction . In the magnetic shield type static induction machine divided into divided bodies ,
A magnetic shield type characterized in that inner surfaces of the plurality of divided bodies constituting the magnetic shield body facing the stationary induction electric body are collectively covered with a magnetic shield plate that is not divided vertically. Static induction machine. Corresponding to a tank having a bent part, a stationary induction electric device body housed in the tank and wound around an iron core, with a predetermined gap in the inner wall of the tank, and corresponding to the bent part of the tank And the magnetic shield body is formed by a laminated body of a plurality of magnetic shield plates, and each magnetic shield body is a portion corresponding to the bent portion of the tank. In the magnetic shield type static induction machine that is divided into a plurality of divided bodies vertically,
A magnetic shield type characterized in that inner surfaces of the plurality of divided bodies constituting the magnetic shield body facing the stationary induction electric body are collectively covered with a magnetic shield plate that is not divided vertically. Static induction machine. Corresponding to a tank having a bent part, a stationary induction electric device body housed in the tank and wound around an iron core, with a predetermined gap in the inner wall of the tank, and corresponding to the bent part of the tank And the magnetic shield body is formed by a laminated body of a plurality of magnetic shield plates, and each magnetic shield body is a portion corresponding to the bent portion of the tank. In a magnetic shield type static induction electric machine that is divided into a plurality of divided bodies vertically through a gap,
The inner surfaces of the plurality of divided bodies constituting the magnetic shield body, which are opposed to the stationary induction electric body, are collectively covered with a magnetic shield plate that is not divided vertically,
The magnetic shield type static induction electric appliance, wherein a gap between the inner wall of the tank and the magnetic shield body is provided larger than a gap between the divided bodies above and below the magnetic shield body. A plurality of the magnetic shield bodies are provided, and the plurality of magnetic shield bodies are arranged in parallel in the circumferential direction of the inner wall of the tank with a vertical gap therebetween, and are not divided into the upper and lower sides. The magnetic shield static induction machine according to claim 1, 2 or 3, wherein the plate is provided with a width substantially equal to a width of the magnetic shield body.

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