JPH0720902Y2 - Gas insulated transformer with tap winding - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a gas-insulated transformer with a tap winding.

B. Outline of the Invention The present invention is that the low-voltage winding and the high-voltage main winding are housed in an insulating container and cooled by a nonflammable refrigerant, and a tap winding is wound around the outer periphery of the insulating container. Is cooled by the non-flammable refrigerant in the insulating tube inside, so that the size of the non-flammable insulating container is reduced and leakage of the non-flammable refrigerant from the insulating container due to the penetration of the tap winding lead wire is eliminated. .

C. Conventional Technology Conventionally, this type of gas-insulated transformer has been constructed as shown in FIG. In FIG. 3, reference numeral 1 denotes an iron core. A low voltage winding 2 and a high voltage main winding 3 are wound around the outer periphery of the iron core 1 and housed in an insulating container 4, and the insulating container 4 is connected to an upper connecting pipe 5 and a lower connecting pipe. 6 and a pump 7 to connect to a cooler 8, in which an incombustible refrigerant 9 (for example, fluorocarbon, perchlorethylene, etc.) is sealed, and the cooler 8 connects the low-voltage winding 2 and the high-voltage main winding 3 , Was configured to cool the coarse tap winding 10 and the fine tap winding 11.

The insulating container 4 and the iron core 1 that house the windings are housed in a tank 15 together with an insulating gas 14 (for example, SF ₆ gas). The lead wire 16 of the rough tap winding 10 and the lead wire 17 of the dense tap winding 11 penetrate the insulating container 4 and are drawn out.

D. Problems to be solved by the invention Conventionally, a gas-insulated transformer with a tap winding in which a transformer main body is housed together with an insulating gas in a tank, and the winding is housed in an insulating container and cooled by a nonflammable refrigerant. Since the tap winding is housed in the insulating container together with the main winding and a large number of lead wires are drawn out, the insulating container becomes large, the required amount of non-flammable refrigerant increases, and the cost increases. Since the drawer of the product rises up in a narrow space inside the insulation container, there are problems such as difficulty in insulation and manufacturing.

The present invention has been made in order to solve such problems of the conventional technology, and reduces the amount of incombustible refrigerant, improves the reliability of insulation, and facilitates the manufacture of a gas-insulated transformer. The purpose is to provide.

E. Means for Solving the Problems In order to achieve the above object, the gas-insulated transformer of the present invention has a low-voltage winding and a high-voltage main winding housed in an insulating container and cooled by a nonflammable refrigerant. A tap winding is wound around the outer circumference of the insulating container, and the tap winding is cooled by a nonflammable refrigerant in an insulating tube inside the tap winding.

F. Action The present invention stores the low-voltage winding and the high-voltage main winding in an insulating container, cools them with a non-combustible refrigerant, and winds the tap winding around the outer periphery of this insulating container. By cooling with the nonflammable refrigerant in the insulating tube, the insulating container can be downsized, and leakage of the nonflammable refrigerant from the insulating container due to penetration of the tap winding lead wire can be eliminated.

G. Example Hereinafter, an example of the gas insulated transformer according to the present invention will be described with reference to the drawings. FIG. 1 is a partial sectional view showing an embodiment of the gas-insulated transformer of the present invention. In FIG. 1, the low-voltage winding 2 and the high-voltage main winding 3 on the outer periphery of the iron core 1 are housed in an insulating container 4, This insulating container 4 is connected to a cooler 8 via an upper connecting pipe 5, a lower connecting pipe 6 and a pump 7, and a non-flammable refrigerant 9 is enclosed inside the insulating container 4, and the cooler 8 allows the low pressure winding 2 and the high pressure main The winding 3 is cooled, and the rough tap winding 10 and the dense tap winding 11 are wound around the outer circumference of the insulating container 4, and the insulating tube 12 is provided between the rough tap winding 10 and the dense tap winding 11.
The upper part of the insulating tube 12 is connected to the upper connecting pipe 5, and the lower part is connected to the cooler 8 through the valve 13, the lower connecting pipe 6 and the pump 7, and the nonflammable refrigerant 9 is used. The rough tap winding 10 and the fine tap winding 11 are configured to be cooled. The iron core 1, the insulating container 4, the coarse tap winding 10, the dense tap winding 11 and the like are housed in a tank 15 together with an insulating gas 14. Therefore, the lead wire 16 of the rough tap winding 10 and the lead wire 17 of the dense tap winding 11 do not penetrate the insulating container 4.

FIG. 2 is a partial sectional view showing another embodiment of the gas-insulated transformer of the present invention. The difference from the embodiment of FIG. 1 is that the tap winding is divided into a coarse tap winding and a dense tap winding. This is the case when there is no tap winding 18. That is, in FIG. 2, the iron core 1
The low-voltage winding 2 and the high-voltage main winding 3 on the outer circumference of the are housed in an insulating container 4, and the insulating container 4 is connected to a cooler 8 via an upper connecting pipe 5, a lower connecting pipe 6 and a pump 7, and its inside A non-combustible refrigerant 9 is sealed in the inside of the container to cool the low-voltage winding 2 and the high-voltage main winding 3 by the cooler 8, and a tap winding 18 is wound around the outer circumference of the insulating container 4. An insulating tube 12 is arranged in the central portion, an upper portion of the insulating tube 12 is connected to the upper connecting pipe 5, and a lower portion is connected to the cooler 8 via a valve 13, the lower connecting pipe 6 and the pump 7.
And the tap winding 18 is cooled by the non-flammable refrigerant 9. The iron core 1, the insulating container 4, the tap winding 18 and the like are stored in a tank 15 together with an insulating gas 14. The lead wire 19 of the tap winding 18 does not penetrate the insulating container 4.

H. Effect of the Invention In the invention, the low-voltage winding and the high-voltage main winding are housed in an insulating container, cooled by a nonflammable refrigerant, and a tap winding is wound around the outer periphery of the insulating container. Is configured to be cooled by the non-flammable refrigerant inside the insulating tube inside, so the tap winding is provided outside the insulating container, so the insulating container becomes smaller and the required amount of non-flammable refrigerant is reduced. Reduced and cost reduced.

Since the tap winding is provided outside the insulating container, there are no many lead wires rising from the tap winding in the insulating container, and there is no problem of leakage of the nonflammable refrigerant from the insulating container due to penetration of the tap lead.

Since the tube for cooling the tap winding serves as a pressure adjusting device, it is not necessary to provide a separate pressure adjusting device.

And other effects.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a gas insulated transformer according to the present invention, FIG. 2 is a partial sectional view showing another embodiment of the present invention, and FIG. 3 is a conventional gas insulated transformer. FIG. 1 ... Iron core, 2 ... Low-voltage winding, 3 ... High-voltage main winding, 4 ...
… Insulation container, 5 …… Upper connecting pipe, 6 …… Lower connecting pipe, 7
…… Pump, 8 …… Cooler, 9 …… Noncombustible refrigerant, 10 ……
Coarse tap winding, 11 …… Dense tap winding, 12 …… Insulating tube, 13 …… Valve, 14 …… Insulating gas, 15 …… Tank, 16
...... Coarse tap winding 10 lead wire, 17 …… Dense tap winding 11
Lead wire of 18 ... Tap winding, 19 ...... Tap winding 18 lead wire.

Claims (1)

[Scope of utility model registration request] 1. A transformer main body formed by winding a low-voltage winding and a high-voltage main winding around an outer circumference of an iron core is housed in a tank together with an insulating gas, and the low-voltage winding and the high-voltage main winding are housed in an insulating container. The upper and lower parts of the insulating container are communicated with the cooler provided outside the tank and the upper connecting pipe and the lower connecting pipe to enclose a non-combustible refrigerant therein, and circulate the non-combustible refrigerant. In this way, the low-voltage winding and the high-voltage winding are cooled, and the tap winding is wound around the outer circumference of the insulating container, and the insulating tube is arranged in the tap winding. A non-combustible refrigerant is passed through the insulating tube to communicate with the upper connecting pipe and the lower connecting pipe respectively to cool the tap winding, and the tap winding and the insulating container are housed in the tank together with the iron core. Characteristic gas insulation with tap winding Divider.