JPH11340057A - Stationary induction electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stationary induction electric apparatus wherein, with no change of form and configuration of a tank, leakage of magnetic flux from a coil into a sealed tank split part is avoided to prevent local overheat at a sealed tank while effective setting range in magnetic shield plate unit can be expanded for easy fitting of the magnetic shield plate and assembling of the tank. SOLUTION: With an electric apparatus main body comprising a coil 2 and an iron core 1 and a tank 4 for housing the electric apparatus main body provided, the tank 4 is so formed as to be split into a plurality of pieces while a magnetic shield member 6 is applied on the inside wall surface of the tank 4. Here, the magnetic shield member 6 is so fitted as to be detached from the inside wall surface of the tank 4 with a supporting body in between, while the end part of the magnetic shield member 6 is so formed that the split part of the tank 4 is covered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in stationary induction electric equipment, and more particularly to a stationary induction induction machine in which a tank accommodating an electric appliance body is formed so as to be dividable and a magnetic shield member is provided on an inner surface of the tank. It relates to electrical equipment.

[0002]

2. Description of the Related Art A stationary induction electric device, for example, a transformer, which has been generally adopted, includes an electric body mainly composed of an iron core and a winding wound around the iron core, a structure for supporting or fixing the electric body, Further, it is composed of a sealed tank for storing these. When a leakage magnetic flux generated by a current flowing through the winding enters a metal structure such as a sealed tank, a large loss occurs due to the generation of an eddy current. As a result, local overheating of metal structures such as tank walls occurs,
It will cause the quality, performance and reliability of the transformer to deteriorate.

In order to suppress the loss caused by the leakage magnetic flux, a magnetic shield plate made of a magnetic material or a good conductor is generally provided on the inner wall surface of the tank facing the winding. This magnetic shield plate is usually fixedly held on the tank wall so as to cover the inner wall surface of the tank, as also shown in FIG. That is, the magnetic shield plate 6 having the long side of the strip-shaped magnetic shield 6 oriented in the axial direction of the winding 2 and parallel to the inner wall surface of the sealed tank 4 is fixed to the inner wall surface of the sealed tank 4. The magnetic shield plate 6, which is fixed to the mounting seat 9 via the mounting bracket 10 and the mounting bolt 11, and is integrally formed in a strip shape, is attached to the adjacent magnetic shield plate 6 with a space therebetween in the horizontal direction.

However, in such a magnetic shield structure,
In order to secure the insulation distance between the projections of the mounting bolts 11 and the windings, there is a dislike that the sealed tank 4 becomes large. Recently, in order to reduce the size and weight of the tank, the mounting bracket 10 of the magnetic shield and the mounting bolt 11 One that eliminates the protrusion has been considered. That is, the configuration is shown in FIG. This is because the long side of the strip-shaped magnetic shield plate 6 is set in the axial direction of the winding 2 and the magnetic shield plate 6 laminated vertically to the inner wall surface of the sealed tank 4 is supported by a support frame of a conductive fixing member. It is fixed via the base 12 and is directly welded 13 to the sealed tank 4 and mounted side by side in the horizontal direction.

On the other hand, the sealed tank of a large-capacity container is generally divided into a plurality of parts for transportation reasons, and the divided part, particularly the flange joint between the main body tank and the main body upper cover, is cooled. Since the magnetic shield plate cannot cover the flange joint due to the mounting structure, the magnetic flux is likely to be overheated at the flange joint and the vicinity thereof due to the incidence of the leakage magnetic flux from the winding.

For this reason, as a means for preventing the leakage magnetic flux from the winding from entering the flange joint, a magnetic shield is separately manufactured and attached to the flange joint. One example is shown in FIG. That is, the magnetic shield plate 6 is attached to the inner wall side of the sealed tank 4 formed by the main body tank 4b and the main body upper cover 4a, and a magnetic shield 14 of a good conductor is provided from the terminal end of the magnetic shield plate 6 to the joint surface of the flange. The leakage magnetic flux from the line is prevented from being incident.

[0007] As related to the magnetic shield of such stationary induction electric equipment, for example, Japanese Patent Publication No.
No. 40164, Japanese Utility Model Application Laid-Open No. 55-34650, and Japanese Patent Application Laid-Open No. 5-283246.

[0008]

With the magnetic shield of the stationary induction electric device formed as described above, there is no particular problem in terms of the magnetic shield.
However, in the case of FIG.
And the support frame 12 or the welding range between the support frame 12 and the magnetic shield plate 6 is wide, so that the number of work steps is increased, and the leakage flux from the winding to the flange joint shown in FIG. The amount of work also becomes extremely large for the magnetic shield structure to be performed, and these conventional magnetic shield structures have problems of layout restrictions and excessive work steps.

In particular, when the sealed tank is divided into three parts or the like for disassembling and transporting the stationary induction electric equipment, two or more flange joints necessary for forming the sealed tank are generated, so that the number of working steps is further increased. Will be done.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent leakage magnetic flux from being wound from windings into a sealed tank division without changing the shape and configuration of the tank. It is an object of the present invention to provide a static induction electric device of this kind which can prevent local overheating of the magnetic induction device, can extend the effective installation range of the magnetic shield plate, and can easily attach the magnetic shield plate and assemble the tank.

[0011]

That is, the present invention comprises an electric body provided with a winding and an iron core, and a tank for accommodating the electric body, and the tank is formed so as to be divided into a plurality. In addition, in a stationary induction electric device in which a magnetic shield member is provided on an inner wall surface of the tank, the magnetic shield member is mounted above the inner wall surface of the tank via a support, that is, with a gap provided between the magnetic shield member and the tank. The end portion of the magnetic shield member is formed so as to cover the divided portion of the tank, that is, so as to straddle the divided portion, thereby achieving the intended purpose.

Further, the present invention includes an electric body provided with a winding and an iron core, and a tank accommodating the electric body, wherein the tank is formed so as to be disassembled into at least an upper cover, a main body tank and a bottom tank. In addition, in a static induction electric device in which a magnetic shield member is provided on the inner wall surface of the tank, the magnetic shield member is attached with a gap provided between the inner wall surfaces of the tank via a support, and The upper end of the longitudinal length protrudes above the joint between the upper cover and the main body tank, and the lower end of the longitudinal length of the magnetic shield is higher than the joint between the bottom tank and the main body tank. Are also formed to protrude downward.

In this case, the magnetic shield member is
A plurality of strip-shaped magnetic shield pieces are arranged side by side on a flat plate made of a non-magnetic material.

That is, in the stationary induction electric device formed as described above, the magnetic shield is attached to the inner wall surface of the sealed tank while floating above the inner wall surface of the sealed tank via, for example, a piece-shaped support. And, since the end portion of the magnetic shield is formed so as to cover the tank divided portion, the tank divided portion is sufficiently shielded at the end portion of the magnetic shield, and the tank is sealed by a wide magnetic shield plate vertically. Injection of magnetic flux leakage from the windings is prevented, local overheating of the sealed tank is prevented, and when assembling the tank, there is a gap between the magnetic shield and the tank. It is easy to assemble without changing, and the work of mounting the magnetic shield plate can be facilitated.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 shows a cross section of a magnetic shield of the stationary induction electric apparatus. Iron core 1 with winding 2
Are wound, and the fastener 3 fastens the iron core 1 from both sides. These are stored together with the insulating medium in the sealed tank 4.

The leakage magnetic flux 5 generated by the current flowing through the winding 2 mainly enters metal structures other than the iron core 1 such as the sealed tank 4 and the fastener 3 and generates a large loss with the generation of the eddy current. Let it. As a result, local overheating may occur in the metal structure such as the sealed tank 4. To prevent this, a magnetic shield plate 6 is placed inside the sealed tank 4.
Is provided. The magnetic shield plate is mounted with a gap between the magnetic shield plate and the inner wall surface of the sealed tank 4 by supports, that is, the mounting plate 7 and the support tool 8.

When there is a step between the ceiling portion and the flange joint portion of the upper cover 4a as shown in FIG. 1, the upper end of the magnetic shield in the longitudinal direction is connected to the main body tank and the main body upper cover 4a. A flange joint other than the above, and a tank side plate 4b in FIG.
And the lower portion of the tank lower bottom stay 4c, the lower end of the magnetic shield in the longitudinal direction is formed by the flange joint between the tank side plate 4b of the main body tank and the tank lower bottom stay 4c. Is also attached so as to protrude downward. FIG. 2 is a view of FIG. 1 as viewed from above. The magnetic shield plate 6 is welded to the inner wall of the sealed tank 4 with a mounting plate 7 and a support 8.

With such a configuration, the magnetic shield plate 6 does not need to be divided at the tank dividing portion, and can be formed as an integral structure. For this reason, while simplifying the work of attaching the magnetic shield, the magnetic shield plate 6 having a wide range up and down prevents the leakage magnetic flux 5 from the windings from being wound on the sealed tank 4 to prevent local overheating of the sealed tank 4. can do.

In the description of the above embodiment, the case where the magnetic shield plate 6, the mounting plate 7 and the support member 8 are integrally formed as the magnetic shield has been described, but the mounting plate 7 is omitted and the magnetic shield plate 6 is supported. It is also possible to attach directly to the tool 8. In this case, there are advantages such as a reduction in weight and an increase in insulation distance.

In the above embodiment, the case where the magnetic shield plate 6 is laminated parallel to the side wall surface of the sealed tank 4 has been described, but the magnetic shield plate 6 is laminated vertically to the side wall surface of the sealed tank 4. It is also possible to attach. In this case, the leakage flux 5 to the magnetic shield plate 6
There is an advantage that a loss due to an eddy current generated by the incidence of light can be reduced.

In the above embodiment, the magnetic shield using a silicon steel plate, which is mainly a magnetic material, has been described based on the multilayer lamination and mounting shape of the magnetic shield plate 6. A stainless steel plate which is a magnetic material may be used. In this case, the present invention can be applied to a static induction electric device that does not require the convergence of the leakage flux to the magnetic shield. Also, the case where the magnetic shield plate 6 is attached by welding has been described, but a welding agent may be used instead of welding. In this case, there is an advantage that a special technique such as welding is not required.

[0022]

As described above, according to the present invention, the local overheating of the sealed tank is prevented by avoiding the incidence of the magnetic flux leaking from the winding to the sealed tank division without changing the shape and configuration of the tank. In addition to this, it is possible to obtain a static induction electric device of this type which can expand the effective installation range of the magnetic shield plate unit and can easily attach the magnetic shield plate and assemble the tank.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a stationary induction electric device according to the present invention.

FIG. 2 is a horizontal sectional view taken from the upper side of FIG. 1;

FIG. 3 is a plan view and a side view showing a magnetic shield portion of a conventional stationary induction electric device.

FIG. 4 is a plan view and a side view showing a magnetic shield part of a conventional stationary induction electric device.

FIG. 5 is a cross-sectional view showing a mounting state of a magnetic shield at a flange joint of a conventional stationary induction electric device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Iron core, 2 ... Winding, 3 ... Clamping, 4 ... Sealed tank, 4
a: Main body upper cover, 4b: Tank side plate, 4c: Tank lower bottom stay, 5: Leakage magnetic flux, 6: Magnetic shield plate, 7
... mounting plate, 8 ... support, 9 ... mounting seat, 10 ... mounting bracket,
11: mounting bolt, 12: support frame, 13: direct welded part, 14: magnetic shield at flange joint.

Claims (4)

[Claims] 1. An electric appliance having a winding and an iron core, and a tank for accommodating the electric appliance, wherein the tank comprises:
In a stationary induction electric device which is formed so as to be able to be divided into a plurality of parts and a magnetic shield member is provided on an inner wall surface of the tank, the magnetic shield member is floated from an inner wall surface of the tank via a support. The stationary induction electric device, wherein the magnetic shield member is mounted and an end portion of the magnetic shield member is formed so as to cover a divided portion of the tank. 2. An electric appliance provided with a winding and an iron core, and a tank for accommodating the electric appliance.
In a stationary induction electric device, which is formed so as to be dividable into a plurality of parts and in which a magnetic shield member is provided on an inner wall surface of the tank, the magnetic shield member is disposed so as to straddle a divided portion of the tank, and the division is performed. A stationary induction electric device characterized in that it is mounted with a gap on an inner wall surface of one of the tanks. 3. An electric appliance having a winding and an iron core, and a tank for accommodating the electric appliance, wherein the tank comprises:
In a static induction electric device which is formed so as to be disassembled at least into an upper cover, a main body tank and a bottom tank, and has a magnetic shield member provided on an inner wall surface of the tank, the magnetic shield member is supported via a support. A gap is provided on the inner wall surface of the tank with a gap therebetween, and the upper end of the longitudinal length of the magnetic shield projects above the junction between the upper cover and the main body tank, and the longitudinal length of the magnetic shield is A stationary induction electric device characterized in that a lower end portion of the base is formed so as to protrude below a joint portion between the bottom tank and the main body tank. 4. The magnetic shield member according to claim 1, wherein a plurality of strip-shaped magnetic shield pieces are arranged side by side on a flat plate made of a non-magnetic material. Stationary induction electrical equipment.