JPH10116737A - Gas insulated transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool the tank side wall surface effectively by a structure wherein a cut for feeding an insulation gas is made in a part of a gas partition board disposed under a transformer body in a tank so that the insulation gas circulates on the tank side wall surface. SOLUTION: The majority of an insulation gas 4 cooled by a gas cooler 7 flows from a gas blower 8 through a lower piping 6 and the space in a tank 3 below a gas partition board 9 to a core 1 and a winding 2 but a part of the insulation gas 4 also flows to a cut part 10 and thereby the side wall face of the tank 3 can also be cooled effectively in addition to the core 1 and the winding 2 of a transformer. The insulation gas 4 having temperature elevated through heat exchange flows through an upper piping 5 and to the gas cooler 7. The cooled insulation gas 4 flows again into the tank 3 from the gas blower 8 through the lower piping 6 and circulates through the channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas-insulated transformer using an insulating gas as an insulating and cooling medium.

[0002]

2. Description of the Related Art In recent years, while the demand for electric power has been increasing, it has become difficult to secure the location of substations on the ground, and plans for constructing substations underground have been rapidly increasing. The power equipment installed in such underground substations is required to be incombustible from the viewpoint of disaster prevention and to be compact in order to reduce the installation area in the basement, and to minimize the temperature in the basement where the power equipment is installed. There is a demand for an efficient cooling method that does not raise the temperature. In response, a so-called gas-insulated transformer that uses a non-flammable insulating gas (for example, SF ₆ gas) instead of insulating oil as a cooling and insulating medium has been developed as a non-flammable transformer that replaces the oil-immersed transformer. Tens of M
It has been put to practical use up to about VA. Since the cooling characteristics of the gas-insulated transformer are 1/10 or less of that of the insulating oil, it is necessary to minimize the heat generated by the gas transformer main body, the side wall of the tank, the fastener, and the like. On the other hand, Japanese Patent Application Laid-Open No. Hei 4-354312 discloses a transformer in which a gas conducting duct divided by a shielding plate having a plurality of ventilation holes is formed in upper and lower portions of a transformer main body to circulate an insulating gas effectively. One that cools the inside has been proposed. However, in this structure, the flow rate between the winding and the side wall of the tank, whose resistance is smaller than the flow rate flowing through the iron core or winding, increases, so the cooling effect of the originally intended iron core or winding is reduced. Is concerned. In addition, since the shielding plates are arranged at the upper and lower portions of the transformer main body, there is a problem that the pressure loss increases and the capacity of the gas blower increases.

[0003]

The conventional gas insulated transformer as described above has a problem that the cooling effect of the core and windings of the transformer and the whole inside of the tank is reduced.

The present invention effectively solves the above-mentioned problems of the prior art. The purpose of the present invention is to provide a cut-out portion for flowing an insulating gas in a part of a gas partition plate, and to provide a cut-out portion in an iron core or a winding. To provide a gas insulation transformer that effectively cools the tank side wall surface by flowing a part of the insulated gas along the tank side wall surface without lowering the cooling effect of the iron core and the windings. is there.

[0005]

According to the present invention, an insulating gas is sealed in a tank containing an iron core and a winding, and a gas path for circulating the insulating gas is provided between the iron core and the winding to cool the transformer body. In the gas insulated transformer, a cutout portion for flowing an insulating gas is provided in a part of a gas partition plate provided in a lower portion of the transformer main body in the tank so that the insulating gas circulates on a side wall surface of the tank. It is characterized by the following.

According to the gas insulating transformer of the present invention, most of the insulating gas flowing from the inlet at the lower part of the gas partition plate flows into the iron core and the windings, but a part of the insulating gas flows into the notch of the partition plate. Therefore, the cooling effect on the tank side wall surface is improved, and the entire transformer can be effectively cooled.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS.

FIG. 1 and FIG. 2 show an embodiment of the present invention. FIG. 1 is a cross-sectional view of the transformer, and FIG.
The sectional views show plan views of a three-phase three-legged iron core structure, respectively. As shown in FIG. 1, an iron core 1 and a winding 2 wound around the iron core 1 are housed in a tank 3 together with an insulating gas 4. The vessel 7 and the gas blower 8 are connected respectively. Further, the inside of the tank 3 is vertically divided by a gas partition plate 9 in order to allow the insulating gas 4 to flow through the iron core 1 and the windings 2, and an upper pipe 5 is provided on a side wall surface of the tank 3 located above the transformer main body. A lower pipe 6 is provided on the side wall surface of the tank 3 below the gas partition plate 9. Further, as shown in FIG.
A notch 10 for flowing the gas is provided, and the insulating gas 4 circulates on the side wall surface of the tank 3.

According to this configuration, most of the insulating gas 4 cooled by the gas cooler 7 is supplied from the gas blower 8 through the lower pipe 6 to the inside of the tank 3 below the gas partition plate 9 as shown by an arrow. Although flowing into the iron core 1 and the winding 2 through the space, a part of the insulating gas 4 also flows into the notch 10 so that not only the inside of the core 1 and the winding 2 of the transformer but also the side wall surface of the tank 3 is formed. It can be cooled effectively. Then, the insulating gas 4 heated to a high temperature by heat exchange flows out to the upper pipe 5 and is guided to the gas cooler 7. Here, the cooled insulating gas 4 is again supplied to the gas blower 8.
Flows through the lower pipe 6 into the tank 3 and circulates in the same flow path as described above. The gas partition plate 9
The notch 10 is provided at a position on the side wall surface of the tank 3 where heat generated by eddy current induced by leakage magnetic flux from the winding 2 is maximized, so that an effective cooling effect can be expected. Further, since only one gas partition plate 9 is disposed at the lower portion of the transformer main body, the pressure loss does not increase, so that it is not necessary to increase the capacity of the gas blower 8. Although the present invention shows an example in which a shield plate is not provided inside the side wall surface of the tank 3, similar effects can be expected even when a shield plate is provided.

FIG. 3 is a plan view of a single-phase transformer according to another embodiment of the present invention. As shown in FIG. 3, the notch 10 is not provided in the partition plate 9 on the side wall surface of the tank 3 facing the iron core 1 on which the winding 2 is not wound, and the winding 2 faces the side wall surface of the tank 3. The notch 10 is provided at two places on the partition plate 9.

According to this configuration, most of the insulating gas 4 (not shown) flows into the core 1 and the windings 2 from the lower portion (in the direction perpendicular to the paper surface) of the partition plate 9, but the notch 10 Also, since a part of the insulating gas 4 flows, not only the inside of the core 1 and the winding 2 of the transformer but also the side wall surface of the tank 3 can be effectively cooled.

FIG. 4 is a plan view of a single-phase transformer according to another embodiment of the present invention. As shown in FIG. 4, the shape of the tank 3 is circular, and a plurality of notches 10 are provided in the circumferential direction of the partition plate 9.

Most of the insulating gas 4 (not shown) flows into the iron core 1 and the windings 2 from the lower portion (in the direction perpendicular to the paper) of the partition plate 9, but the cutout 10 also has a part of the insulating gas 4. Flows, not only the inside of the core 1 and the winding 2 of the transformer but also the side wall surface of the tank 3 can be effectively cooled. Further, since current flows uniformly in the circumferential direction on the side wall surface of the tank 3 which is concentric with the winding 2, a plurality of notches are formed in the partition plate 9 in order to generate heat uniformly in the circumferential direction. The unit 10 is required.
Therefore, compared with the rectangular tank, since the plurality of cutouts 10 are provided along the heat generation, effective cooling can be performed on the side wall surface of the tank 3. Although the shape of the tank 3 has been described by taking a square and a circle as an example, a similar effect can be expected in an elliptical tank, a pressure vessel, and the like. Notch 1
The shape of 0 is a semicircle, but the same effect can be obtained with a shape such as a circle or a square. By changing the diameter of the notch 10 in accordance with the magnitude of the loss on the side wall surface of the tank 3,
More efficient cooling can be achieved. Although the embodiment of FIG. 1 to FIG. 4 describes an example in which the cooling medium is an insulating gas in the gas insulating transformer, the same effect can be obtained when the cooling medium is insulating oil, perfluorocarbon (PFC), or the like. Can be expected.
Although the present invention has been described with respect to a transformer, the present invention can be applied to a reactor, and the effect can be expected similarly to the transformer described above.

[0014]

According to the present invention, an insulating gas is sealed in a tank containing an iron core and a winding, and a gas path for circulating the insulating gas is provided between the iron core and the winding to cool the transformer body. In the gas insulating transformer, an insulating gas inlet pipe is provided on a tank side wall surface below the transformer main body, and an insulating gas outlet pipe is provided on a tank side wall surface above the transformer main body. A notch for the flow of insulating gas is provided in a part of the gas partition plate provided at the bottom, so that the tank can be cooled efficiently with a small amount of insulating gas at the side of the tank that generates a large amount of heat. The tank can be cooled without impairing the cooling effect of the wire.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing one embodiment of the present invention.

FIG. 3 is a plan view showing a second embodiment of the present invention.

FIG. 4 is a sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Iron core, 2 ... Winding, 3 ... Tank, 4 ... Insulating gas, 5 ...
Upper pipe, 6 lower pipe, 7 gas cooler, 8 gas blower, 9 gas partition plate, 10 notch.

 ──────────────────────────────────────────────────の Continued from the front page (72) Inventor Yoshihiro Nagao 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside Hitachi Kokubu Plant

Claims (7)

[Claims] An insulating gas is sealed in a tank accommodating an iron core and a winding, and a gas path for circulating the insulating gas is provided in the iron core and the winding to cool the transformer body. An insulating gas inlet pipe provided on a side wall surface of the tank at a lower portion of the main body, and a gas insulating transformer provided with an outlet pipe of the insulating gas on a side wall surface of the tank at an upper portion of the transformer main body. A gas partition plate provided at a lower portion of the transformer main body, wherein a cutout portion for flowing the insulating gas is provided so that the insulating gas circulates on a side wall surface of the tank. Transformer. 2. A gas passage for enclosing an insulating gas in a tank accommodating an iron core and a winding, arranging a shield plate inside a side wall surface of the tank, and circulating the insulating gas through the iron core and the winding. In order to cool the transformer main body, an inlet pipe for the insulating gas is provided on the tank side wall face below the transformer main body, and the insulating gas outlet pipe is provided on the tank side wall face above the transformer main body. In the gas insulated transformer provided with, a notch portion for flowing the insulating gas is provided in a part of a gas partition plate provided in a lower portion of the transformer main body in the tank, and the insulating wall is provided on a side wall surface of the tank. A gas-insulated transformer, wherein gas is circulated. 3. The gas-insulated transformer according to claim 1, wherein a plurality of notches are provided for flowing the insulating gas along a portion of the tank side wall surface which generates a large amount of heat. 4. The gas-insulated transformer according to claim 1, wherein the opening area of the cutout portion is changed depending on the location in order to flow the insulating gas along a portion of the tank side wall surface which generates a large amount of heat. 5. A notch for flowing said insulating gas through a part of said gas partition plate provided at a lower portion of said transformer main body in said tank is formed in a semicircular, round or square shape. Item 3. The gas insulated transformer according to item 1 or 2. 6. A notch for allowing an insulating gas to flow in a portion of a rectangular tank provided at a lower portion of the transformer main body and facing a winding, and the insulating wall is provided on a side wall surface of the tank. 3. The gas insulated transformer according to claim 1, wherein the gas is circulated. 7. A plurality of notches are provided in a circumferential direction of a gas partition plate provided at a lower portion of the transformer main body in a circular tank so that the insulating gas circulates on a side wall surface of the tank. Item 3. The gas insulated transformer according to item 1 or 2.