JPH06231974A - Insulated composite induction electric apparatus - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the amount of refrigerant liquid used to fill the internal container. [Structure] The main leg 12 of the iron core located in the center and the winding wire 22 wound around the main leg 12 are arranged in an insulating tubular portion 32, and the main leg 11 of the iron core located on the left side and the winding wound around the main leg 11 The wire 21 and the side leg 14 of the iron core adjacent to the line 21 are arranged in the insulating cylindrical portion 31, and the main leg 13 of the iron core located on the right side, the winding wire 23 wound around the main leg 13, and the side of the iron core adjacent thereto The legs 15 were arranged in the insulating cylindrical portion 33, the inner container including the insulating cylindrical portions 31 to 33 was filled with the refrigerant liquid, and the whole of them was housed in the tank 1 in which the insulating gas was sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite insulation type induction electric machine, for example, a transformer, a reactor, etc., and particularly, an iron core and a winding are immersed in a refrigerant liquid and housed in an internal container.
The present invention relates to a composite insulation induction electric device in which these are arranged in a tank filled with an insulating gas.

[0002]

2. Description of the Related Art As a composite insulating induction electric device of this type, there is known one disclosed in, for example, Japanese Patent Laid-Open No. 2-244703, and another one is provided in a tank filled with an insulating gas such as SF6 gas. It has been practiced to arrange an inner container, store the iron core and the winding in the inner container, and fill the coolant with the coolant to immerse them therein to improve the cooling performance of the iron core and the winding having high heat generation density. Non-flammable perfluorocarbon is used as this refrigerant liquid, but it is very expensive, so it is desirable to minimize the amount of its use. Each of them is arranged in a separate insulating tubular portion, and each insulating tubular portion is sealed by a upper and lower yoke container portion surrounding the upper and lower iron core yokes via a common plate.

[0003]

However, in the conventional composite insulated induction electric device, there is a case where the iron core has side legs such as a three-phase five-leg iron core, a single-phase three-leg iron core, or a single-phase four-leg iron core. No consideration is given. Therefore, when a composite insulated induction electric machine having side legs on the iron core is constructed by extending the conventional concept, the main legs of each iron core and each insulating cylindrical portion surrounding the winding wound around this, and the iron core of the iron core. It is necessary to have an insulating tubular portion that individually surrounds the side legs, and the dimension required for juxtaposing each of these insulating tubular portions will be larger than the dimension required for insulation. The size of the upper and lower yoke containers surrounding each of them increases, and the amount of the refrigerant liquid filling the inside increases.

Therefore, it is an object of the present invention to provide a composite insulated induction electric device which can reduce the amount of the refrigerant liquid filling the inner container.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a main leg of an iron core, a winding wound around the iron core, and a side leg of the iron core adjacent to the winding. It is characterized in that it is arranged in the insulating tubular portion.

[0006]

Since the composite insulated induction electric machine according to the present invention has the above-described structure, the windings arranged in one insulating cylindrical portion and the side legs of the iron core are arranged as close as possible to the required dimension for insulation. Therefore, the inner container including the upper and lower yoke container parts can be miniaturized in the axial direction of the upper and lower yokes.
As a result, the amount of the refrigerant liquid used to fill the inner container can be reduced.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a cross-sectional plan view and a vertical sectional front view of a composite insulation transformer having a three-phase five-leg iron core according to an embodiment of the present invention. In the tank 1, main legs 11 to 13, side legs 14,
A three-phase five-leg iron core consisting of 15 and upper and lower yokes 16 and 17 is arranged, and each main leg 11 to 13 has a respective phase winding 2
1 to 23 are wound. The main leg 12 located in the center and the winding wire 22 wound around the main leg 12 are arranged in an insulating cylindrical portion 32 having a substantially circular cross section, and the main leg 1 located on the left side
1 and winding 21 wound around it and side leg 1 adjacent to this
4 is the same as the main leg 13 located on the right side, the winding 23 wound around the same, and the side leg 15 adjacent to the main leg 13, which is arranged in the insulating tubular portion 31 having a substantially oval cross section. And is disposed in the insulating cylindrical portion 33 having a substantially oval cross section. These three insulating tubular portions 31, 32, 33 are juxtaposed at a predetermined distance in the major axis direction of the tank 1 having a substantially oval cross section, and the same insulating tubular portions 31, 33 are provided.
A predetermined insulation distance is secured between the windings 21 and 23 and the side leg iron cores 14 and 15 arranged inside in the above-described major axis direction.

Both ends of each of the insulating tubular portions 31 to 33 arranged side by side in the vertical direction are respectively provided at portions corresponding to the upper and lower end openings of the insulating tubular portions 31 to 33 as shown in FIG. A common plate 41 having two openings 41a, 42a,
2, the main legs 11 to 13 and the side legs 14 are mechanically coupled as shown in FIG. 2 from the openings 41a and 42a corresponding to the upper and lower ends of the insulating tubular portions 31 to 33, respectively. , 15 both upper and lower ends are led out. The upper and lower ends of the main legs 11 to 13 and the side legs 14 and 15 are connected by an upper yoke 16 and a lower yoke 17, respectively, and the upper and lower yokes 16 and 17 are connected to the common plate 41 shown in FIG. , 42 are housed in an upper yoke container part 51 and a lower yoke container part 52 connected so as to seal the openings 41a, 42a, and the lower end of the lower yoke container part 52 is welded at its peripheral edge to the bottom plate of the tank 1. The opening is sealed, while the upper yoke container 51 has a rubber separator 60 at the upper end.
It is sealed by. In this way, the tank 1 is configured with an inner container divided by the insulating tubular parts 31 to 33, the common plates 41 and 42, the upper and lower yoke container parts 51 and 52, the separator 60, and the like. The container is filled with a refrigerant liquid, and an insulating gas is sealed between the inner container and the tank 1.

According to this embodiment, as described above, the side leg 1
4 is arranged in the insulating cylindrical portion 31 together with the main leg 11 and the winding 21, and the side leg 15 is arranged in the insulating cylindrical portion 33 together with the main leg 13 and the winding 23. And side leg 14
And the winding 23 and the side leg 15 can be arranged close to each other while ensuring a distance necessary for insulation, and the side legs 14 and 15 are arranged in dedicated insulating cylindrical portions, respectively. Compared with, the dimension of the tank 1 in the major axis direction can be significantly reduced. For example, when the insulation class of the outer winding is No. 80, the reduction dimension in the same direction is about 450 to 500 mm. For this reason, the size of the upper yoke container part 51 and the lower yoke container part 52 in the same direction is also reduced, and the volume of the internal container formed in the tank 1 by these upper and lower yoke container parts 51, 52, etc. is reduced. It is possible to reduce the amount of the refrigerant liquid that satisfies the condition.

In the above embodiment, the insulating tubular portions 31 and 33, which accommodate the side legs together with the main leg and the winding, have a substantially oval cross-section, but the present invention is not limited to this. It can also have a shape, for example a substantially circular shape or an egg shape.

In the case of a composite insulation transformer having a single-phase four-leg iron core, as shown in FIG. 4, the main leg 16 located on the left side, the winding 24 wound around this, and the outside thereof. The side leg 18 located at is disposed in the insulating tubular portion 34, and
By arranging the main leg 17 located on the right side, the winding 25 wound around the main leg 17, and the side leg 19 located outside the main leg 17 in the other insulating tubular portion 35, the same operation as in the above-described embodiment is achieved. The effect can be obtained.

Further, in the case of a composite insulation transformer having a single-phase three-leg iron core, as shown in FIG. 5, the main leg 71 located at the center, the winding 26 wound around the main leg 71, and both sides are provided. All the side legs 72 and 73 located are arranged in one insulating tubular portion 36, or, as shown in FIG. 6, the main leg 71 located in the center, the winding 26 wound around this, and the both sides One of the side legs 72 and 73 (here, the side leg 72) is disposed on one insulating tubular portion 37, and only the other side leg 73 is independently disposed on another insulating tubular portion 38. By doing so, it is possible to obtain the same effect as that of the above embodiment.

Further, the side leg arranged in the insulating tubular portion is, for example, a facing portion in consideration of the facing portion with the winding arranged together and the facing portion with the inner wall surface of the insulating tubular portion. The cross-sectional shape can be changed so as to conform to those shapes as much as possible, and by doing so, the length of the insulating cylindrical portion in the longitudinal direction of the yoke can be reduced to further increase the longitudinal dimension of the inner container. It can be reduced.

In the above embodiment, the case of application to the composite insulation transformer has been described, but the present invention is not limited to this, and may be similarly applied to other composite insulation induction electric appliances such as a composite insulation reactor having side legs on the iron core. it can.

[0015]

As described above, according to the present invention, the main leg of the iron core and the side leg of the iron core adjacent to this main winding together with the winding wound around the main leg are placed in one insulating cylindrical portion. Since it is arranged, it is possible to arrange the winding and the side leg of the iron core, which are arranged in one insulating cylindrical portion, as close as possible to the dimension required for insulation, and therefore, the inside including the upper and lower yoke container portions. It is possible to reduce the size of the container in the axial direction and reduce the amount of the refrigerant liquid used to fill the inner container.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a composite insulation transformer according to an embodiment of the present invention.

FIG. 2 is a vertical sectional front view of the composite insulation transformer shown in FIG.

FIG. 3 is an exploded perspective view of an inner container of the composite insulation transformer shown in FIG.

FIG. 4 is a cross-sectional plan view of a composite isolation transformer according to another embodiment of the present invention.

FIG. 5 is a cross-sectional plan view of a composite isolation transformer according to still another embodiment of the present invention.

FIG. 6 is a cross-sectional plan view of a composite isolation transformer according to still another embodiment of the present invention.

[Explanation of Codes] 1 Tank 11-13 Main leg of iron core 14,15 Side leg of iron core 21-23 Winding 31-33 Insulating tubular part 51,52 Upper and lower yoke container parts

Front page continuation (72) Inventor Masanori Mitsui 1-1-1 Kokubuncho, Hitachi City, Ibaraki Hitachi Kokubun Plant, Hitachi, Ltd. Power Co., Ltd.

Claims (7)

[Claims] 1. A tank filled with an insulating gas, an iron core composed of a main leg, side legs, and upper and lower yokes arranged in the tank, a winding wound around the iron core, and a main leg of the iron core,
Insulating cylindrical parts surrounding the side legs and the windings, and upper and lower yoke container parts surrounding the upper and lower yokes, respectively, the iron core and the entire winding are separated from the insulating gas and immersed in a refrigerant liquid. In a composite insulated induction electric device having an inner container for accommodating, a main leg of the iron core and a winding wound around the main leg together with a side leg of the iron core adjacent to the winding are formed into one insulating tube. A composite insulating induction electric device characterized in that it is arranged in a cylindrical portion. 2. The iron core according to claim 1, wherein the iron core is a three-phase five-leg iron core, and the main leg located in the center, the winding wound on the main leg, and the main leg located on one side. Legs, windings wound on this main leg and side legs located outside this winding, and main legs located on the other side, windings wound on this main leg and outside this winding And a side leg located in the insulating tubular portion, respectively. 3. The core according to claim 1, wherein the iron core is a single-phase four-leg iron core, and the main leg located on one side, the winding wound on the main leg, and the outside of the winding. The side leg positioned, the main leg positioned on the other side, the winding wound on the main leg, and the side leg positioned outside the winding are arranged in the respective separate insulating tubular portions. A composite insulation induction electric device characterized by the above. 4. The iron core according to claim 1, wherein the iron core is a single-phase three-leg iron core, and the main leg is located at the center, the winding wound on the main leg, and both sides of the winding. At least one of the both side legs is arranged in one of the insulating tubular parts, the composite insulated induction electric device. 5. The composite insulated induction electric device according to claim 1, wherein the insulating tubular portion has a substantially circular cross-sectional shape. 6. The composite insulated induction electric device according to claim 1, wherein the insulating tubular portion has a substantially egg-shaped cross section. 7. The composite insulated induction electric device according to claim 1, wherein the insulating tubular portion has a substantially oval cross-sectional shape.