JP2000252133A - Cooling apparatus for gas-filled electrical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive, silent cooling apparatus of gas-filled electrical equipment by making a casing of a first heat exchange with a thick sound insulating material and providing a cooling piping for circulation of a cooling liquid within the casing. SOLUTION: This cooling equipment includes gas-filled electrical devices 3 and 4 housed in a gas-sealed container, a first heat exchange 9 for transmitting a thermal energy of a sealing gas 2 sealed into the gas-filled electrical devices to a cooling liquid, a second heat exchange 12 having a circulating pump for externally dispersing the thermal energy of the cooling liquid, a first cooling pipe line 7 having a circulating pump for circulating the sealing gas of the gas-filled electrical devices for heat exchange with the first heat exchange, a second cooling pipe line 10 for circulating the cooling liquid between the first and second heat exchanges, and a cooling piping provided within sound- insulating casing for passage of the cooling liquid through the interior of the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a gas-filled electrical device, and more particularly to a cooling device for a gas-filled electrical device in which an outer casing of a heat exchanger constituting the cooling device has a sound insulation structure to reduce noise. Related to the device.

[0002]

2. Description of the Related Art FIG. 3 is a view showing a conventional heat exchanger for exchanging heat between an insulating gas such as SF6 gas and a cooling gas such as air. In the figure, reference numeral 20 denotes a heat exchanger, 21 denotes a corrugated sheet that forms a space through which SF6 gas flows, and 22 denotes a corrugated sheet that forms a space through which air flows. Reference numeral 23 denotes a partition plate disposed between the corrugated plates 21 and 23, and the insulating gas and the cooling gas are separated by the partition plate 23.

The SF 6 gas heated by the heat generated in the transformer main body is sent to the heat exchanger 20 as shown by an arrow A.
On the other hand, the cooling air is supplied in a direction orthogonal to the SF6 gas as shown by an arrow B. Note that heat transfer of the insulating gas and the cooling gas is performed by heat conduction of the partition plate 23. Then, the temperature of the cooled SF is reduced by the cooling air.
The six gases are circulated to the transformer tank via a circulation pump.

Further, as another prior art, a first heat exchanger for cooling the insulating gas with water and a second heat exchanger for exchanging heat between the water and the atmosphere and cooling the water are provided. Cooling devices are known.

FIG. 4 is a diagram showing a cooling device for gas-containing electric equipment disclosed in Japanese Utility Model Laid-Open Publication No. 59-176123.

In the figure, 31 is a tank of a gas insulated transformer, 32 is a transformer main body, 33 is an insulating gas such as SF 6 gas filled in the tank, 34 is a heat exchanger installed near the tank 31, Reference numeral 35 denotes a primary pipe of the heat exchanger 4, and the high temperature side of the primary pipe communicates with the upper part of the tank wall, and the low temperature pipe communicates with the lower part of the tank wall. A radiator 36 is installed outdoors, and has a structure in which, for example, a pipe is bent and fins are attached. Reference numeral 37 denotes a secondary pipe of the heat exchanger 34 which communicates with the radiator 36. The secondary pipe 37 is filled with a cooling medium such as chlorofluorocarbon having good cooling properties. Numeral 38 denotes a cooling medium storage tank such as Freon, which is installed at a position higher than the heat exchanger 34. 39 is the cooling medium stored in the tank.

The SF 6 gas 33 heated by the heat generated in the transformer main body 32 is sent to the heat exchanger 34 from the high-temperature side of the primary pipe, and is cooled by the cooling medium in the secondary pipe of the heat exchanger. The low temperature SF6 gas is circulated in the tank 31. Further, a cooling medium such as chlorofluorocarbon heated and gasified by the SF6 gas 33 in the heat exchanger 34 is sent to the radiator 36 through the secondary side pipe 37, and cooled and liquefied by the radiator 36. It flows into the storage tank 38. Then, the water is circulated again from the storage tank into the heat exchanger 34.

[0008]

In a conventional gas-containing electric equipment cooling device, a transformer tank and a radiator are connected by a pipe inserted through, for example, a circulation pump, and the inside of the pipe is filled with SF6 gas or the like. The transformer is cooled by circulating the insulating gas. SF
When the 6 gas is circulated by the circulation pump through the transformer tank, the heat exchanger, and the pipeline connecting them, the SF6 gas collides with internal structures such as the transformer tank, the cooling pipeline, the heat exchanger, and generates noise. . This noise leaks outside through the casing of the heat exchanger.

In the conventional heat exchanger, SF6 gas and air are separated by a partition plate, and heat transfer between the SF6 gas and air is performed by heat conduction of the partition plate. For this reason, a thin partition plate must be used in order to improve heat conduction. However, if a thin partition plate is used, noise leaking to the outside cannot be effectively prevented.

[0010] Further, in the cooling device provided with the first heat exchanger and the second heat exchanger, huge equipment such as a water tank is required, and the cooling equipment becomes expensive.

The cooling device disclosed in Japanese Utility Model Laid-Open Publication No. Sho 59-176123 uses chlorofluorocarbon as a cooling medium, which makes the cooling equipment expensive. Further, none of the above-mentioned prior arts is intended to reduce cooling noise.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an inexpensive gas-cooled electric equipment cooling device in which the heat exchanger has a sound insulation structure to reduce noise.

[0013]

The present invention employs the following means in order to solve the above-mentioned problems.

A gas-filled electrical device containing an electrical device in a gas-filled container; a first heat exchanger for transferring the thermal energy of the filled gas sealed in the gas-filled electrical device to a coolant; A first heat exchanger having a second heat exchanger that dissipates heat energy to the outside air and a circulation pump that circulates a gas filled in the gas-filled electric device between the first heat exchanger;
And a circulating pump for circulating the cooling liquid between the first heat exchanger and the second heat exchanger.
In the cooling apparatus for gas-filled electrical equipment comprising: a cooling pipe line, the first heat exchanger includes a sound insulating casing through which the sealed gas flows, and a cooling pipe through which the coolant flows through the sound insulating casing. It is characterized by having.

In the cooling device for gas-containing electric equipment, the gas-containing electric equipment, a circulating pump and a first
Characterized in that the heat exchanger is disposed in the building.

Further, in the cooling device for a gas-containing electric device, the cooling liquid is perfluorocarbon.

Further, in the cooling device for a gas-filled electric device, the sound insulation casing has a sound insulation material attached thereto.

[0018]

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

FIG. 1 is a diagram showing a cooling device for gas-filled electric equipment according to the present embodiment. 1 is a tank of a gas insulated transformer, 2 is an insulating gas such as SF6 gas sealed in the tank 1, 3 is a transformer core installed in the tank 2, 4 is a transformer winding, and 5 is a lower core tightening. Metal fittings, 6 are upper core fastening metal fittings,
7 is a gas line connecting between the transformer tank 1 and the first heat exchanger, 8 is a gas circulation pump inserted into the gas line 7,
Reference numeral 9 denotes a first heat exchanger that cools the insulating gas 2 with a cooling liquid, and is disposed near a tank of the gas insulating transformer.
10 is a liquid line connecting the first heat exchanger and the second heat exchanger, 11 is a liquid circulation pump inserted into the liquid line,
Reference numeral 12 denotes a heat exchanger that releases heat of the cooling liquid to the atmosphere. As the cooling liquid, a nonflammable or nonflammable liquid, for example, perfluorocarbon or silicone oil is used in consideration of disaster prevention of the entire electric equipment. Water or insulating oil can also be used.

In the figure, a part of a transformer tank 1, a gas line 7, a gas circulation pump 8, a first heat exchanger 9, a liquid circulation pump 11, and a liquid line 10 are installed in a building.
The remainder of the liquid line 10 and the second heat exchanger 12 are located in the building.

If the first heat exchanger 9 is arranged near the tank of the gas insulated transformer, the gas line 7 can be shortened. Therefore, the resistance of the pipeline is reduced, and the flow rate of the insulating gas circulated by the gas circulation pump 8 is sufficiently ensured, so that efficient cooling becomes possible.

The SF 6 gas heated by the heat generated in the transformer core 3 and the transformer windings 4 is supplied to the first heat exchanger 9 from the high temperature side of the gas line 7 attached to the upper part of the transformer tank.
Sent to The SF 6 gas cooled by the cooling liquid in the liquid line 10 of the heat exchanger and cooled to a low temperature is circulated through the gas circulation pump 8 into the tank 1.

The coolant heated by the SF 6 gas in the first heat exchanger 9 passes through the liquid side pipe 10 to the second heat exchanger 9.
To the first heat exchanger 9, cooled by the second heat exchanger 12 and passed through the liquid circulation pump 11.
Circulates within.

FIG. 2 is a diagram showing the first heat exchanger. In the figure, reference numeral 9a denotes a sound insulating casing of the first heat exchanger, which is formed to have a thick wall or a sound insulating material is attached to the casing to provide a sound insulating effect. The sound insulation casing 9a communicates with the gas pipe 7 to connect the insulating gas
As shown by arrow C. Reference numeral 10a denotes a cooling pipe through which the cooling liquid passes, and performs heat exchange in the casing 9a by passing the cooling liquid as shown by an arrow D.

The insulating gas such as SF6 gas sealed in the transformer tank 1 circulates through the transformer tank 1, the gas line 7, the first heat exchanger 9, and the gas circulation pump 8 as described above. At this time, the circulating insulating gas collides with the transformer core 3, the transformer winding 4, the cooling pipe 10a and the like, and generates cooling noise such as wind noise.

Even if the cooling noise is generated as described above, the generated cooling noise can be shielded by the thick sound-insulating casing 9a, so that it can be prevented from leaking outside.

According to the present embodiment, heat exchange between the insulating gas and the cooling liquid is performed through the cooling pipe 10a and not through the sound insulating casing 9a, so that the casing can be formed thick or the casing can be provided with a sound absorbing material. It is possible to take sound insulation measures such as attaching

[0028]

According to the present invention, the casing of the first heat exchanger is formed of a thick sound insulating material, and the casing is provided with a cooling pipe through which the coolant flows. An inexpensive gas-cooled electric device cooling device can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cooling device for a gas-filled electric device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a heat exchanger according to an embodiment of the present invention.

FIG. 3 is a diagram showing a conventional heat exchanger.

FIG. 4 is a diagram showing a conventional cooling device for gas-containing electric equipment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas-insulated transformer tank 2 Insulating gas 3 Transformer core 4 Transformer winding 5 Lower iron core clamp 6 Upper iron core clamp 7 Gas pipeline 8 Gas circulation pump 9 First heat exchanger 9a Sound insulation casing 10 Liquid Pipe 10a Cooling pipe 11 Liquid circulation pump 12 Second heat exchanger

Claims (4)

[Claims] 1. A gas-filled electrical device containing an electrical device in a gas-filled container, a first heat exchanger that transfers heat energy of a sealed gas filled in the gas-filled electrical device to a coolant, and the cooling device. A second heat exchanger for dissipating the heat energy of the liquid to the outside air; and a first cooling pipeline having a circulation pump for circulating the gas filled electric device with the first heat exchanger. A cooling device for gas-filled electrical equipment, comprising: a second cooling pipe having a circulation pump that circulates the cooling liquid between the first heat exchanger and the second heat exchanger; Wherein the heat exchanger includes a thick sound-insulating casing through which the sealed gas flows, and a cooling pipe through which the coolant flows within the sound-insulating casing. 2. The cooling device for a gas-containing electric device according to claim 1, wherein the gas-containing electric device, the circulation pump, and the first heat exchanger are arranged in a building. 3. The cooling device for a gas-filled electric device according to claim 1, wherein the cooling liquid is perfluorocarbon. 4. The cooling device for a gas-filled electric device according to claim 1, wherein a sound insulating material is attached to the sound insulating casing.