JPH0722257A - Stationary induction machine - Google Patents

Abstract

PURPOSE:To provide a stationary induction machine in which significant miniaturization can be realized even when three-phase transformers having different capacity are housed in one oil tank while protecting the transformer having lower capacity against the leakage flux from the transformer having higher capacity. CONSTITUTION:When the transformer bodies 1A, 1B having different capacity are housed in one oil tank 101 and arranged substantially perpendicularly to each other, a magnetic shield 10 is provided between both transformers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction machine, and more particularly to a static induction machine constructed by accommodating a plurality of three-phase transformer contents having different capacities in the same oil tank.

[0002]

2. Description of the Related Art In a power plant or substation, a large-capacity main transformer for converting a certain voltage into another required voltage and transmitting the power, and power used in the power plant or substation are secured. It is common to install a small-scale on-site transformer for this purpose.

However, it is considered that a plurality of transformers having different capacities as described above are housed in the same oil tank for reasons such as limitation of land area, reduction of man-hours for installation, omission of fire-extinguishing equipment.

It is already known to store a plurality of transformer contents having a relatively small capacity and the same capacity in the same oil tank. Further, JP-A-48-1828 can be cited as one in which a plurality of transformer contents are stored in the same oil tank, and for the purpose of downsizing and weight reduction.

On the other hand, when the capacities of a plurality of three-phase transformers housed in the same oil tank are significantly different, it is very effective to arrange the contents of the three-phase transformers substantially vertically because of the downsizing and the oil tank shape. is there.

[0006]

SUMMARY OF THE INVENTION
The same applies to the structure of 48-1828, but when a plurality of three-phase transformers with significantly different capacities are stored in the same oil tank, the leakage flux from the transformer winding with a large capacity causes Because the contents of a small transformer are affected and the three-phase magnetic flux affects the imbalance, the voltage on the transformer side with a small capacity becomes unbalanced, circulating current flows in the winding, and stray loss increases and winding There is a possibility that a transformer with a small capacity may be adversely affected, such as an increase in wire temperature.

As described above, in the plurality of three-phase transformers housed in the same oil tank according to the prior art, no proper consideration is given to eliminate the magnetic influence of each transformer. When a plurality of three-phase transformers having significantly different capacities are housed in the same oil tank, there is a problem that the leakage magnetic flux from the transformer with a large capacity adversely affects the transformer with a small capacity.

The present invention has been made in view of the above points,
The purpose is that even if three-phase transformers with different capacities are housed in the same oil tank, the size can be greatly reduced, and the leakage flux from the transformer winding with a large capacity can reduce the capacity. The purpose of the present invention is to provide a static induction generator that does not affect a small transformer.

[0009]

According to the present invention, in order to achieve the above object, when the contents of transformers having different capacities are housed in the same oil tank and arranged substantially vertically, the respective transformers are arranged vertically. A magnetic shielding plate is provided between them. Furthermore,
It is more effective to provide a common part of oil on at least one side of the upper part or the lower part of the magnetic shield plate.

[0010]

With the above configuration, it is possible to shield the leakage magnetic flux from the transformer winding having a large capacity,
It is possible to prevent the influence on the transformer with a small capacity.

[0011]

The present invention will be described in detail below with reference to the illustrated embodiments.

FIG. 1 and FIG. 2 show an embodiment of the present invention. In an oil tank in which a plurality of (two in the figure) transformer contents are housed in the same oil tank and arranged substantially vertically It is the figure which looked at from the plane and the side.

As shown in the figure, when the transformers have significantly different capacities and the contents have significantly different sizes, the transformer 1A having a large capacity and the transformer 1B having a smaller capacity than that are seen from a plane. If it is arranged almost vertically, the space factor in the oil tank 101 is very good, and by adopting a three-phase tripod core as the iron core, the longitudinal dimension of each of the contents is reduced, so that the size can be reduced.

However, since the transformer 1A having a large capacity and the transformer 1B having a small capacity are arranged substantially vertically,
When a current flows through the winding of the transformer 1A having a large capacity, leakage magnetic flux is generated from the winding.

In this case, since the respective transformers are arranged substantially vertically, the distance between the windings of the U, V and W phase of the transformer having a large capacity and the winding of the transformer having a small capacity is reduced. Differently, the influence of leakage flux from the U, V, W phases of the transformer with large capacity is different, and it is possible to cause imbalance of each phase voltage of the transformer with small capacity and cause circulating current in each phase winding. There is a nature.

Therefore, in this embodiment, the magnetic shield plate 10 is mounted between the contents of each transformer. The magnetic shield plate 10 may be made of a steel plate used in a normal oil tank 101, and is attached to the side plate of the oil tank 101 by welding or other suitable means as shown in FIG.

Moreover, the magnetic shield plate 10 has the oil tank bottom plate side above or below the oil tank bottom plate side or the oil tank cover side so that the insulating oil of the chamber in which the contents of the respective transformers are housed is common and can move freely. The magnetic shield is removed.

This is because each transformer is cooled by a common cooler, so it is desirable that the insulating oil is common, and an internal failure has occurred in the oil tank section of either transformer. In this case, the pressure in the oil tank compartment rises, and the insulating oil moves to the other compartment side. Therefore, it is necessary to allow the insulating oil to freely move in the magnetic shield plate portion.

FIG. 3 is an explanatory diagram in which a copper plate is attached to the magnetic shield plate surface on the transformer side having a large capacity.

As described with reference to FIG. 1, the magnetic shield plate 10
As for the above, the one using a normal steel plate has a sufficient shielding effect, but when the leakage magnetic flux from the transformer with a large capacity is very large, the magnetic shielding plate 10 is a magnetic substance, so that it overheats and strays. Losses can also increase.

Therefore, the copper plate 11 is formed on the surface of the magnetic shield plate 10.
By attaching a magnetic flux to the magnetic shield plate 10, an eddy current is passed through the copper plate to completely prevent the magnetic flux from leaking, thereby preventing the magnetic shield plate from overheating and affecting the transformer with a small capacity. It becomes possible to do.

Since the eddy current in the copper plate 11 flows as shown in FIG. 4 with respect to the magnetic flux which tries to enter, the magnetic shield plate 10 and the central portion of the copper plate 11 are not particularly necessary, and as shown in FIG. The same effect can be obtained with a magnetic shielding plate with a copper plate, which has the central portion removed. This structure not only reduces the materials for the copper plate and the magnetic shield plate and the number of manufacturing steps, but also has the effect of making it possible to more smoothly move the insulating oil due to the aforementioned internal failure.

FIG. 6 is an explanatory diagram of an embodiment in which the magnetic shield plate 10 is not fixed from the side plate of the oil tank 101, but is fixed from the supporting structure inside the transformer.

The magnetic shield plate 10 in this case may be a normal steel plate as described above, or a magnetic shield plate in which a copper plate is attached to a steel plate.
Since the leakage flux is expected to be very large, a magnetic shielding plate such as a silicon steel plate having a high orientation and a high magnetic permeability is very effective.

In the figure, as the mounting structure of the magnetic shield plate, a method of using the iron core tightening metal fitting of a transformer having a large capacity and installing it independently of the iron core of the transformer is shown. The magnetic shield is the upper yoke of the transformer core,
Alternatively, it may be magnetically completely connected to either one of the lower yokes.

When one transformer having a large capacity and two transformers having a small capacity are housed in the same oil tank, as shown in FIG.
Alternatively, as shown in FIG. 8, any of the above-described embodiments may be applied to both sides of a transformer having a large capacity.

With this configuration, when a plurality of transformers having different capacities are housed in the same oil tank, the transformer having a small capacity can be downsized without adversely affecting the transformer.

[0028]

According to the static induction electric device of the present invention described above, the contents of a plurality of three-phase transformers having different capacities are such that those having different capacities are substantially perpendicular to each other when viewed in a plane. Since the magnetic shielding plates supported by the side plates of the oil tank are provided between the contents of the three-phase transformers having different capacities, the contents of a plurality of three-phase transformers are stored in the same oil tank. In this case, it is possible to prevent the leakage magnetic flux from the transformer with a large capacity from adversely affecting the transformer with a small capacity, making it possible to easily manufacture a transformer with the same oil tank and to reduce the size. It will be possible.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a static induction generator of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a cross-sectional layout explanatory diagram of a magnetic shielding plate applied to one embodiment of the present invention.

FIG. 4 is a sectional layout explanatory diagram of a magnetic shield plate applied to one embodiment of the present invention.

FIG. 5 is a cross-sectional layout explanatory diagram of a magnetic shielding plate applied to one embodiment of the present invention.

FIG. 6 is a cross-sectional layout explanatory diagram of a magnetic shielding plate applied to one embodiment of the present invention.

FIG. 7 is a side view showing another embodiment of the magnetic shield mounting structure of the present invention.

FIG. 8 is a plan view showing another embodiment of the transformer arrangement configuration of the present invention.

FIG. 9 is a plan view showing still another embodiment of the transformer arrangement configuration of the present invention.

[Explanation of symbols]

1A, 1B, 1C ... Transformer, 10 ... Magnetic shielding plate, 11 ...
Copper plate, 12 ... Slit, 13 ... Transformer iron core, 14 ... Iron core tightening metal fitting, 101 ... Oil tank.

Claims (8)

[Claims] Claim: What is claimed is: 1. A static induction electric device comprising a plurality of three-phase transformer contents of different capacities housed in the same oil tank, wherein the three-phase transformer contents are different in their arrangement direction. A static induction electric device characterized in that a magnetic shield plate supported from a side plate of an oil tank is provided between the contents of the three-phase transformers having different capacities, which are arranged so as to be substantially right angles in a plan view. 2. A static induction electric device comprising a plurality of three-phase transformers of different capacities contained in the same oil tank, wherein a three-phase transformer of a certain capacity is used as a reference. The arrangement direction of the three-phase transformer having a smaller capacity than that of the arrangement direction is arranged so as to be substantially perpendicular to the arrangement direction. A static induction electric device comprising a magnetic shielding plate supported from a side plate. 3. A large-capacity main transformer for converting a voltage to another required voltage to transmit electric power, and a small-capacity on-site transformer for securing electric power used in a power plant or substation. In the same oil tank, the main transformer and the in-house transformer are arranged substantially at right angles in a plan view, and are supported from the side plate of the oil tank between the main transformer and the in-house transformer. A static induction electric device characterized in that a magnetic shield plate is provided. 4. The static induction machine according to claim 1, wherein at least one side of the upper portion or the lower portion of the magnetic shield plate is opened so that insulating oil can be commonly used. 5. The static induction electric device according to claim 4, wherein a copper plate is attached to one side or both sides of the magnetic shield plate. 6. The static induction machine according to claim 5, wherein a slit is provided in a part of the magnetic shield plate and the copper plate. 7. The static induction machine according to claim 1, wherein the magnetic shield plate is made of a material having a high magnetic permeability. 8. A magnetic shielding plate made of the high magnetic permeability material,
The static induction electric machine according to claim 7, wherein a supporting structure of the contents of the three-phase transformer is used, and the supporting structure is arranged between the respective transformer contents.