JPH04354312A - Gas insulation transformer - Google Patents

Abstract

PURPOSE:To increase a cooling effect by forming a gas duct which is enclosed by a shielding plate having the plurality of air holes in the upper and lower part of the main body of a transformer in a container and by circulating insulating gas in the main body of the transformer through the gas ducts. CONSTITUTION:Insulating gas 3 cooled by a radiator 4 flows into a lower gas duct 13 through a lower catch 5b. Then, the insulating gas 3 is taken in into a container through inlets formed in a lower shielding plate 13a. At that time, a large quantity of insulating gas is taken in into a gas canal 8 where caloric power is large and a small quantity of insulating gas is taken in into a space between the inner face of the container 1 and the outer surface of a coil 7 where caloric power is small. From the lower part upward, insulating gas entirely cools the inside of the container 1 including the inner face of the container 1, an iron core 6, the coil 7, and magnetic components 10. The insulating gas 3 which has been heated to high temperature due to heat exchange passes through exhaust holes 12 formed in an upper shielding plate 11a, flowing into an upper duct, to be lead into the radiator 4 through a catch 5a.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated transformer, and more particularly to a gas insulated transformer which has been improved so that the heat generated by the transformer as a whole can be effectively cooled.

0002

2. Description of the Related Art In recent years, as the capacity of gas insulated transformers has increased, the amount of heat generated in the transformer body has also increased. Also,
Along with this, the amount of leakage magnetic flux from the windings also increases, and the leakage magnetic flux density also increases. Such leakage magnetic flux enters structures such as tank side walls and iron core fasteners, causing stray loss and locally causing an excessive temperature rise. As a result, the loss not only increases, but also causes deterioration of the adjacent insulator, so it is necessary to reduce heat generation in these main body parts and local heat generation as much as possible.

Conventionally, as a cooling structure for a gas insulated transformer, a partition plate for blocking the flow of insulating gas is provided between the outer circumference of the windings and the inner surface of the container, and the insulating gas flowing from the lower part of the container is controlled to the core and the inner surface of the container. A transformer was used that was configured to lead to gas provided inside the windings and cool the transformer body. An example of such a cooling structure is shown in FIG. That is, in a gas insulated transformer, a transformer body 2 consisting of an iron core and windings is housed together with an insulating gas 3 in a container 1 having upper and lower joints 5a and 5b, and heat is removed from the iron core and windings to generate a high temperature. The resulting insulating gas is led out from the upper joint 5a to the external radiator 4, cooled by the radiator 4, and then sent into the container 1 again from the lower joint 5b. In addition, the lower joint 5b
The low-temperature insulating gas 3 sent from the bottom of the core 6 and the winding 7 to the transformer is blocked by the partition plate 9 provided between the outer periphery of the winding and the inner surface of the container. The gas is forced to flow into the gas passage 8 formed in the main body 2. The insulating gas 3, which has become high temperature by cooling the iron core 6 and the winding 7, moves upward in the gas passage 8 and connects the upper joint 5a.
It is configured so that it is led out again to the outside and circulated within the heat radiator 4.

0004

However, the conventional gas insulated transformer as described above has the following problems to be solved. That is, in the gas insulated transformer shown in FIG. 3, the insulating gas 3 always circulates in a fixed flow path, that is, a closed flow path such as gas pipe-joint 5a-radiator 4-joint 5b-gas pipe 8. do. Therefore, the insulating gas does not circulate in the parts outside the flow path, such as the gap between the inner surface of the container 1 and the outer periphery of the winding 7, or the inner surface of the container 1 on the side where the radiator is not installed, and the insulating gas does not circulate inside the container 1. An effective cooling effect for the entire transformer could not be expected.

The present invention was proposed to solve the above-mentioned drawbacks, and its purpose is to provide a gas-insulated transformer with high cooling effect, which can effectively cool the entire interior of the container containing the transformer body. It is about providing the equipment. [Structure of the invention]

[0006]

[Means for Solving the Problems] The present invention stores a transformer body consisting of an iron core and a winding wound around the iron core together with an insulating gas in a container, and stores the insulating gas inside the iron core and the winding. In a gas-insulated transformer that cools the transformer body by circulating insulating gas, the transformer body is partitioned by a shielding plate with multiple ventilation holes at the top and bottom of the transformer body inside the container. The present invention is characterized in that the insulating gas is circulated to the transformer body through the gas guiding ducts.

[0007]

[Operation] According to the gas insulated transformer of the present invention, the insulating gas flows out and enters the entire container in which the transformer body is housed through the ventilation holes in the shielding plate and is circulated, thereby effectively insulating the container. Gas can be circulated, further increasing the cooling effect.

[0008]

[Embodiment] An embodiment of the present invention will be explained in detail below with reference to FIGS. 1 and 2. Note that the same members as those of the conventional type shown in FIG. 3 are given the same reference numerals, and detailed explanations will be omitted.

In this embodiment, as shown in FIG.
An iron core 6,
A transformer body 2 consisting of a winding 7, a magnetic component 10 such as a clamp, etc. is housed together with an insulating gas 3, and joints 5a, 5
A heat sink 4 is connected to the outside of b.

Inside the container 1, there is an upper gas guiding duct 11 partitioned off by an upper shielding plate 11a at the upper part of the transformer main body 2, and a lower guiding gas guiding duct 13 partitioned at the lower part by a lower shielding plate 13a. and are connected to the heat sink 4 via joints 5a and 5b, respectively. Furthermore, as shown in FIG. 2, the upper and lower shielding plates 11a and 13a are provided with a plurality of ventilation ports (exhaust port 12 and intake port 14) of different sizes and shapes. Note that the shape, size, number, and opening position of the vents 12 and 14 are appropriately set according to the heat generation state of the voltage generator main body 2. In other words, many large-diameter vents are provided in the gas passages to the iron core 6 and windings 7, which generate a large amount of heat, and small-diameter vents are installed in the surrounding gas passages, which generate less heat. Provide a small number of vents.

In the gas insulated transformer of this embodiment having such a configuration, the inside of the container 1 is cooled as described below. That is, the insulating gas 3 cooled by the radiator 4 flows into the lower gas guiding duct 1 via the lower joint 5b.
It flows into 3. Thereafter, the insulating gas 3 is exhausted from the intake port formed in the lower shielding plate 13a. A small amount of gas is sucked into the gap between the inner surface of the winding 7 and the outer periphery of the winding 7, and as it moves from the bottom to the top, it touches the inner surface of the container 1, the iron core 6, the winding 7, the magnetic parts 10, etc., and the container 1. Effectively cools the entire interior. The insulating gas 3, which has become high temperature due to heat exchange, passes through the upper shielding plate 1.
It passes through the exhaust port 12 formed in 1a, flows into the upper gas guide duct 11, and is guided to the radiator 4 via the joint 5a. The insulating gas 3 cooled here again flows into the lower gas guiding duct 13 in the container 1 and circulates through the same flow path as described above.

[0012] In this way, depending on the heat generation situation inside the container 1,
The amount of intake air from the lower gas guiding duct 13 and the intake location are as follows:
By adjusting the intake port 14, it can be set appropriately, and by providing a similar exhaust port 12 in the upper gas guiding duct 11, the insulating gas 3 is effectively circulated within the container 1, and the entire interior of the container 1 is circulated. Can be effectively cooled. In addition,
The present invention is not limited to the embodiments described above,
It is also possible to use the partition plate 9 in FIG. 3 instead of the lower gas guiding duct.

[0013]

As described above, according to the present invention, a transformer body consisting of an iron core and a winding wound around the iron core is housed in a container together with an insulating gas, and the In a gas insulated transformer that is provided with a gas path through which insulating gas circulates and cools the transformer body by circulating the insulating gas, a shielding plate having a plurality of ventilation holes at the upper and lower parts of the transformer body within the container. Since the gas guiding duct partitioned by the above structure is provided, it is possible to obtain a gas insulated transformer with high cooling effect, which can effectively cool the entire inside of the container containing the transformer main body.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is a perspective view showing the configuration of a gas guiding duct that constitutes the gas insulated transformer shown in FIG. 1;

FIG. 3 is a sectional view showing a conventional gas insulated transformer.

[Explanation of symbols]

1 Container 2　　　　Transformer body 3 Insulating gas 6 Iron core 7 Winding wire 8 Gas line 11 Upper gas guide duct 13 Lower gas guide duct 11a, 13a　　　shielding plate 12 Exhaust port 14 Intake port

Claims (1)

[Claims] 1. A transformer body consisting of an iron core and a winding wound around the iron core is housed in a container together with an insulating gas, and a gas passage through which the insulating gas circulates is provided within the iron core and the winding, In a gas insulated transformer that cools the transformer body by circulating insulating gas, a gas guiding duct partitioned by a shielding plate having a plurality of vents at the upper and lower parts of the transformer body is provided in the container. A gas insulated transformer characterized by: