JPH10149925A - Gas-insulated transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently adsorb a cracked gas and moisture in a gas by arranging porous cylinders inside pipes and providing adsorbents between the pipes and the porous cylinders. SOLUTION: The main body of a transformer 6 is housed in a tank 1 and the tank 1 is connected to a radiator 2 through upper and lower pipelines 3a and 3b. Porous cylinders 5 are housed inside the pipes 3a and 3b and adsorbents 4 are positioned between the pipes 3a and 3b and the porous cylinders 5. The decomposition gas and moisture of an SF6 gas 7 containing the decomposition gas and moisture generated in the main body 6 of the transformer are adsorbed into the adsorbents 4 installed to the upper pipe 3a when the gas flows to the radiator 2 from the tank 1. Therefore, the gas and moisture can be adsorbed efficiently from the SF6 gas in the tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a gas-insulated transformer.

[0002]

2. Description of the Related Art Gas-insulated transformers, which are gas-insulated electrical devices, use SF ₆ gas for insulation. SF ₆ gas alone has extremely excellent thermal stability and does not decompose at high temperatures, but if local overheating or partial discharge occurs inside the gas-insulated transformer, SF ₆ gas is exposed to high temperatures. If insulators and metals coexist,
When SF ₆ gas is decomposed and moisture coexists, hydrolysis is performed using a silicon steel sheet as a catalyst. Substances generated by the decomposition of this SF ₆ gas are SOF ₂ , SO ₂ , HF and the like.
It accelerates the deterioration of the insulator, and causes the life of the device to be shortened. Therefore, the moisture and SF inside the gas-insulated transformer
_An adsorbent 4 is sealed inside the gas-insulated transformer for the purpose of adsorbing gas decomposition products. FIG. 3 is a configuration diagram showing an example of a conventional gas-insulated transformer. The gas-insulated transformer has a transformer content 6 installed in a tank 1 in which SF ₆ gas 7 is sealed. A radiator 2 for cooling the SF ₆ gas 7 in the tank 1 is connected via an upper pipe 3a and a lower pipe 3b. SF in tank 1
_{The 6} gas 7 absorbs heat generated from the contents 6 of the transformer, rises to the upper part of the tank 1, and flows into the radiator 2 via the upper pipe 3a. The SF ₆ gas 7 flowing into the radiator 2 descends while being cooled in the radiator 2, and flows into the lower portion of the tank 1 via the lower pipe 3 b. Decomposed gas and moisture generated in the transformer contents 6 circulate between the tank 1 and the radiator 2 similarly to the SF ₆ gas 7.
When SF ₆ gas 7 containing decomposition gas and moisture flows from the radiator 2 into the lower part of the tank 1, it is easy to install and
From workability, by the adsorbent 4 attached to the lower part of the tank 1,
The structure is such that decomposed gas and water having a molecular diameter smaller than the effective pore diameter of the adsorbent 4 are adsorbed on the adsorbent 4.

[0003]

However, in such a structure, the SF ₆ gas circulates in the tank by natural convection. However, since the adsorbent 4 is installed at the lower part of the tank 1, the upper pipe 3a and the lower pipe 3a are arranged. Since all of the decomposition gas and water in the SF ₆ gas 7 passing through 3b do not pass near the adsorbent 4, the decomposition gas and water generated from the transformer contents 6 are:
There was a disadvantage that only a part was adsorbed by the adsorbent 4. Accordingly, the present invention provides a gas insulating transformer that efficiently adsorbs decomposition gas and moisture in SF ₆ gas 7 by installing adsorbent 4 in upper pipe 3a and lower pipe 3b through which SF ₆ gas circulates. .

[0004]

Accordingly, a gas-insulated transformer according to the present invention has a porous cylinder disposed inside a pipe connecting a transformer tank and a radiator, and an adsorbent is provided between the pipe and the porous cylinder. The configuration is provided.

[0005]

FIG. 1 is a configuration diagram of a gas-insulated transformer showing an example of an embodiment of the present invention. In FIG. 1, transformer contents 6 are stored in a tank 1, and the tank 1 and the radiator 2 are connected by an upper pipe 3a and a lower pipe 3b. FIG. 2 is a sectional perspective view of the upper pipe 3a and the lower pipe 3b. The porous cylinder 5 is arranged inside the upper pipe 3a and the lower pipe 3b inside the cylinder, and the adsorbent 4 is installed between the upper pipe 3a, the lower pipe 3b and the porous cylinder 5. The perforated cylinder 5 is formed by making a hole in one plate, and rounding it to form a cylindrical tube.
a, It is fixed to the lower pipe 3b. The SF ₆ gas 7 containing the decomposed gas and the moisture which has become high temperature in the tank 1 is cooled by the radiator 2 through the upper pipe 3a, and returns to the tank 1 again through the lower pipe 3b by natural convection. S containing decomposition gas and moisture generated in the transformer contents 6 in the tank 1
The F ₆ gas 7 is sent to the radiator 2 through the upper pipe 3a according to natural convection, but the decomposed gas and moisture are adsorbed when flowing from the tank 1 to the radiator 2 by the adsorbent 4 installed in the upper pipe 3a. I do. The decomposition gas and water that could not be adsorbed at this time are removed from the radiator 2
When the SF ₆ gas returns from the tank to the tank 1, it passes through the lower pipe 3 b, so that the remaining decomposed gas and moisture that could not be adsorbed above can be adsorbed and efficiently adsorbed. Can be prevented.

[0006]

By placing the adsorbent in the SF ₆ gas circulation path, the SF ₆ gas containing the decomposed gas and water in the tank passes near the adsorbent, so that the decomposed gas and water can be efficiently adsorbed. In addition, corrosion of materials and deterioration of insulators can be prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example of an embodiment of a gas-insulated transformer of the present invention.

FIG. 2 is a cross-sectional perspective view showing an example of a pipe of the gas insulated transformer of the present invention.

FIG. 3 is a configuration diagram illustrating an example of a conventional gas-insulated transformer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tank 2 Radiator 3a Upper piping 3b Lower piping 4 Adsorbent 5 Perforated cylinder 6 Contents of transformer 7 SF ₆ Gas 8 Perforated cylinder support plate

Claims (1)

[Claims] 1. A gas-insulated transformer in which a radiator is connected to a transformer tank by a pipe, wherein a porous cylinder is disposed inside the pipe, and an adsorbent is provided between the pipe and the porous cylinder. Gas-insulated transformer.