JPH0697645B2 - Composite insulation transformer - Google Patents

Description

The present invention relates to a composite insulation transformer.

[Conventional technology]

In large-capacity gas-insulated transformers, in order to improve cooling performance, the core with high heat generation density and windings are made of non-combustible liquid refrigerant (hereinafter,
It is performed by cooling with a refrigerant liquid). Particularly for large capacity ones, a method of immersing both the iron core and the winding in a refrigerant liquid has been researched and developed. With this method,
Provide another container in the tank, store all the windings and the iron core in this container, and further immerse the winding and the iron core in the refrigerant liquid by filling the refrigerant liquid with the container and the tank. The space between them is filled with SF ₆ gas.

In Japanese Patent Laid-Open No. 63-182807, it is shown that the iron core and the winding are housed in a synthetic resin container together with a refrigerant liquid, but the winding housed together with the iron core is entirely in the synthetic resin container. It is arranged.

Non-combustible perfluorocarbon is used as a refrigerant liquid in a large-capacity gas-insulated transformer, but it is a heavy liquid having a density about twice that of conventional mineral oil, and therefore the container has sufficient mechanical strength to withstand the liquid pressure. You will need it. Further, since the refrigerant liquid is very effective, it is necessary to minimize the amount used. From these viewpoints, for a transformer having a plurality of iron core legs, a portion of the winding wound around the iron core legs is formed into a cylindrical insulating container that independently surrounds the winding, Has been researched and developed in which a core is connected to a container that wraps the upper and lower iron core yokes via a common plate, and the iron core and the winding are wrapped as a whole.

[Problems to be Solved by the Invention]

In the above-mentioned conventional techniques, all of the windings are arranged in an insulating container, and therefore, when a winding having a large number of leads such as a tap winding is in the insulating container, the lead wire is pulled out, Since it is necessary to secure a space for shaping and connection, the amount of liquid increases. In addition, since many lead wires are pulled out from the container, there is a problem that the reliability of the container such as sealing property and strength at the penetrating portion is deteriorated.

The present invention has been made in view of the above points, and an object of the present invention is to provide a composite insulation transformer capable of significantly reducing the amount of expensive liquid, improving reliability, and downsizing. .

[Means for Solving the Problems]

The above object is achieved by disposing a part of the winding on the outside of the insulating cylindrical container.

A part of the winding, in particular, a winding having many lead wires such as tap coils is arranged outside the insulating cylindrical container.

In addition, an outer winding is formed by winding the insulating cylinder container around a winding arranged outside the insulating cylinder container.

Further, the inner diameter of the winding arranged on the outer side is smaller than the outer diameter of the flange of the insulating cylindrical container.

[Action]

Since a part of the winding is arranged outside the insulating cylindrical container, the diameter of the insulating cylindrical container is reduced by that much, and the liquid amount is reduced.

In addition, since the winding disposed outside the insulating cylindrical container is a tap winding, it is not necessary to secure a space for drawing, shaping, and connecting many lead wires in the insulating cylindrical container. The amount of liquid is reduced, and it is not necessary for many lead wires to penetrate the insulating cylindrical container, and the reliability of the insulating cylindrical container such as sealing property and strength is improved.

Further, by forming the winding disposed on the outer side of the insulating cylindrical container around the insulating cylindrical container as a winding form, it is not necessary to install a new winding form.

In addition, since the inner diameter of the winding that is placed outside the insulating tubular container is smaller than the outer diameter of the flange of the insulating tubular container, the installation space of the insulating tubular container can be used effectively and the size of the entire transformer can be reduced. You can

〔Example〕

Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 shows an embodiment of the present invention. As shown in the figure, the composite insulation transformer is provided with a tank 1 and a container for accommodating the iron core 2 and the winding together with the refrigerant liquid in the tank 1 to separate it from the gas portion. It is a cylindrical insulating cylindrical container 3 that independently surrounds the windings wound around each. In the composite insulation transformer having such a structure, in this embodiment, a part of the winding is arranged outside the insulating cylindrical container 3. By doing so, a part of the winding is arranged outside the insulating cylindrical container 3, and it is not necessary to arrange the entire winding inside the insulating cylindrical container 3 as in the conventional case. It is possible to obtain a composite insulation transformer that can significantly reduce the amount of expensive liquid, improve reliability, and downsize.

That is, the tank 1 has an iron core 2, a high-voltage winding 4, a low-voltage winding 5, and a tap winding 6, and the high-voltage and low-voltage windings 4 and 5 are insulated cylindrical containers provided separately for each iron-core leg. 3 is arranged inside, and the tap winding 6 is arranged outside the insulating cylindrical container 3. This insulating cylindrical container 3 has upper and lower flanges 3a and 3b.
Are connected to upper and lower common plates 7 and 8 respectively, and these common plates 7 and 8 are respectively connected to a container 9 enclosing an upper iron core yoke portion and a container 10 enclosing a lower iron core yoke portion. It surrounds the windings 4, 5. The tap winding 6 is formed by winding the insulating cylindrical container 3 as a winding form through a spacer 11 and has an inner diameter of the flange of the insulating cylindrical container 3.
It is smaller than the outside diameter of 3a and 3b. Also tap winding 6
Is the flange 3a of the insulating cylindrical container 3 by the insulating support columns 12 and 13,
Backed by 3b. The lead wire 6a extending from the outer peripheral side of the tap winding 6 is connected between the upper and lower sides of the winding, and then wired inside the tank 1 and connected to a load tap changer (not shown).

As described above, since all of the tap winding 6 and a large number of lead wires 6a extending from the tap winding 6 for drawing, shaping, and connecting are outside the insulating cylindrical container 3, the insulating cylindrical container 3
The inner diameter of the high and low voltage windings 4 and 5 may be wrapped,
The amount of liquid can be significantly reduced as compared with the case where the tap winding 6 is arranged in the insulating cylindrical container 3. Also, tap winding 6
Since a large number of lead wires 6a coming out of the insulating cylinder container 3 do not penetrate the insulating cylindrical container 3, there is no fear that the sealing property and strength of the insulating cylindrical container 3 will be reduced, and the reliability is improved. Further, since the tap winding 6 is formed by winding the insulating cylindrical container 3 as a winding form, it is not necessary to install a new winding form. further,
Since the inner diameter of the tap winding 6 is smaller than the outer diameter of the flanges 3a and 3b of the insulating cylindrical container 3, the outer diameter of the tap winding 6 can be reduced accordingly, the interphase distance can be reduced, and the transformer can be reduced. The overall dimensions are also smaller.

As described above, according to this embodiment, the amount of expensive liquid can be significantly reduced. Further, since the factor of lowering the sealing property and strength of the insulating cylindrical container is avoided, the reliability of the transformer is improved. Furthermore, since the outer diameter of the tap winding can be reduced by effectively utilizing the space in which the flange of the insulating cylindrical container travels in the radial direction, the overall size of the transformer can be reduced.

〔The invention's effect〕

As described above, according to the present invention, the amount of expensive liquid is significantly reduced, the reliability is improved and the size can be reduced, and the amount of expensive liquid is significantly reduced, and the reliability and the size can be improved. It is possible to obtain a composite insulation transformer.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an embodiment of the composite insulation transformer of the present invention. 1 ... Tank, 2 ... Iron core, 3 ... Insulated cylinder container, 3a, 3b
...... Flange, 4 ... High-voltage winding, 5 ... Low-voltage winding, 6 ...
… Tap winding, 12,13 …… Insulation support pillar

Claims (6)

[Claims] 1. A tank, and a container for accommodating an iron core and a winding together with a refrigerant liquid in the tank to separate the container from a gas portion. The container is provided with independent windings wound around the respective core legs. In the composite insulation transformer, which is a cylindrical insulation cylinder container that is surrounded by the above, a part of the winding is arranged outside the insulation cylinder container. 2. The composite insulation transformer according to claim 1, wherein the winding arranged outside the insulating cylindrical container is a tap winding. 3. The composite insulation transformer according to claim 1, wherein the winding disposed outside the insulating cylindrical container is formed by winding the insulating cylindrical container as a winding form. 4. The composite insulation transformer according to claim 1, wherein an inner diameter of a winding arranged outside the insulating cylindrical container is smaller than an outer diameter of a flange of the insulating cylindrical container. 5. The composite insulation transformer according to claim 4, wherein the winding disposed outside the insulating cylindrical container is supported by the flange of the insulating cylindrical container via an insulating support column. 6. The composite insulation transformer according to claim 5, wherein the insulating support column is formed of a plastic that has a small dimensional change among plastics.