JPH0349376Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to, for example, a pressure-controlled gas-insulated static inductor, and in particular to its pressure regulation.

[Conventional technology]

FIG. 3 is a partially cutaway schematic diagram of a conventional pressure-controlled gas insulated transformer. In the figure, 1 is a sealed container of the transformer, and 2 is an iron core and a coil installed in the sealed container 1. A transformer body consisting of
3 is a non-condensable insulating gas sealed in the sealed container 1; 4 is a high pressure detector that detects when the pressure in the sealed container 1 has exceeded a predetermined value; 5 is a sealed container 1;
6 is a storage tank for storing insulating gas 3; 7 is controlled by high pressure detector 4 to supply insulating gas 3 from inside sealed container 1; A compressor 8 that feeds into the storage tank 6 is controlled by a high pressure detector and the sealed container 1
a valve for opening and closing the flow of insulating gas from the storage tank 6 to the storage tank 6;
is a valve that is controlled by the low pressure detector 5 and opens and closes the flow of insulating gas from the storage tank 6 to the sealed container 1.
The sealed container 1 and storage tank 6 are filled with an appropriate amount of insulating gas.

A conventional pressure-controlled gas insulated transformer is configured as described above, and when the transformer starts operating and the pressure inside the sealed container 1 rises above a predetermined value due to a rise in gas temperature due to body loss, high pressure is detected. The device (4) detects this and opens the valve 8 and operates the compressor 7 to send the insulating gas 3 into the storage tank 6. High pressures are thus avoided, and the wall thickness of the sealed container of a pressure-controlled gas insulated transformer is therefore thinner than that of a non-pressure controlled gas insulated transformer. Furthermore, when the pressure inside the sealed container 1 drops below a predetermined value due to a drop in gas temperature due to the loss of main body loss caused by stopping the transformer, the low pressure detector 5 detects this and opens the valve 9. The insulating gas in the storage tank 6 is blown out into the sealed container 1. In this way, a decrease in insulation ability for the transformer body 2 due to a decrease in gas pressure is prevented. In this way, the pressure inside the sealed container 1 is adjusted within the range of the predetermined upper and lower limits, and the insulating gas 3 circulates between the sealed container 1 and the storage tank 6, so that it serves to cool the transformer body 2. is also doing.

Further, FIG. 4 schematically shows, partially cut away, a conventional pressure-controlled gas insulated transformer that includes an insulating material that liquefies or vaporizes within the operating temperature and pressure range in addition to the insulating gas. In the figure 1
9 to 9 are similar to those explained in connection with FIG. This is a liquid level detector that detects the level of substance 3A.

This conventional pressure-controlled gas insulated transformer is configured as described above, and when the transformer starts operating, the pressure inside the sealed container 1 rises due to the rise in gas temperature due to body loss, and exceeds a predetermined value. and high pressure detector 4
At the same time as opening the valve 8, the compressor 7 is driven to send a mixture of the insulating gas 3 and the vaporized gas of the insulating material 3A into the storage tank 6, so that the pressure inside the sealed container 1 does not rise above a predetermined value. I have to. Of the mixture sent into the storage tank 6, the insulating material 3
The gas A is compressed by the compressor 7 and is liquefied and stored in the lower part of the storage tank 6. The liquid level detector 10 measures the level of the insulating substance 3A in the storage tank 6 so that the level of the liquid insulating substance 3A in the sealed container 1 does not fall below a predetermined value.
The level of the liquid insulating substance 3A in the storage tank 6 is monitored, and when the level of the liquid insulating substance 3A in the storage tank 6 exceeds a predetermined value, the valve 9 is opened, and the high gas pressure in the storage tank 6 causes the insulating substance 3 to
A is sent into the sealed container 1. The valve 9 is also opened by the low pressure detector 5, and when the pressure inside the sealed container 1 becomes lower than a predetermined value, the valve 9 is opened and the liquid insulating substance 3A is discharged from the storage tank 6 into the sealed container 1. Furthermore, the insulating gas 3 in the storage tank 6 is also sent out. The insulating substance 3A that has entered the sealed container 1 is vaporized because the pressure is lower than the pressure in the storage tank 6, and insulates the transformer body 2 together with the insulating gas 3. Since the insulating material absorbs the heat of vaporization during the vaporization, the insulating material has the ability to cool the transformer body 2 more strongly than that shown in FIG. 3.

[Problem that the invention attempts to solve]

As shown in any of the above conventional examples, in conventional pressure-controlled gas-insulated stationary inductors, a medium such as an insulating gas or a mixture thereof with an insulating substance added thereto is stored in order to absorb pressure fluctuations within a sealed container. Since the storage tank 6 is installed on the ground for the purpose of releasing and discharging water, the storage tank 6 is affected by the temperature of the surrounding atmosphere, and the pressure inside the storage tank 6 rises due to the hot summer air. Increase the wall thickness of 6,
Furthermore, the compressor 7 must be made more powerful to withstand the gas pressure.

This invention was made in order to solve this problem, and aims to maintain the internal pressure of the storage tank at a relatively low pressure without being affected by atmospheric temperature.

[Means for solving problems]

The pressure-controlled gas-insulated stationary inductor according to this invention has a storage tank buried underground.

[Effect]

In this invention, since the storage tank is buried underground, it is not affected by solar radiation or atmospheric temperature, and the internal pressure of the storage tank is maintained within a relatively low range.

〔Example〕

FIG. 1 is a schematic diagram showing an embodiment of this invention, and numerals 1 to 9 are exactly the same as the conventional device shown in FIG. 11 is an underground space in which the storage tank 6 is buried. Insulating gas 3 is sulfur hexafluoride (SF ₆ ).
It is.

In the pressure-controlled gas insulated transformer configured as described above, the temperature inside the sealed container 1 rises due to iron loss in the transformer body 2, and the internal pressure rises. 4 opens the valve 8 and operates the compressor 7 to send the insulating gas 3 into the storage tank 6.
Since the storage tank 6 is buried underground, it is not affected much by the outside world such as solar radiation, and the internal pressure of the storage tank 6 is not increased more than necessary, and the wall thickness is thinner than that of the conventional storage tank shown in Fig. 3. I can do it. Furthermore, since the pressure in the storage tank 6 does not become higher than necessary, the compressor can also be made smaller than conventional compressors. When the load on the transformer becomes smaller and the heat generated in the transformer body 2 becomes smaller, and the pressure inside the sealed container 1 decreases, the low pressure detector 5 opens the valve 9 and insulating gas is supplied from the storage tank 6 into the sealed container 1. to prevent the insulation ability from decreasing due to pressure drop. Since the pressure in the storage tank 6 does not become higher than necessary, all members such as the valve 9 can be made smaller and lighter, and loss of auxiliary equipment can be reduced.

FIG. 2 is a schematic diagram showing another embodiment of this invention, where 1 to 10 are exactly the same as the conventional example shown in FIG. 4, and 11 indicates an underground space in which the storage tank 6 is buried. . Note that the insulating gas 3 is sulfur hexafluoride (SF ₆ ), and the insulating substance 3A is fluorocarbon (C ₈ F ₁₆ O).

In the pressure-controlled gas insulated transformer configured as described above, the operating mode is the same as that explained with reference to FIG.
A dissolves the insulating gas well. As shown in FIG. 5, the solubility characteristics of the insulating gas 3 are high at low temperatures and low at high temperatures. Therefore, since the storage tank 6 is buried underground, the temperature of the storage tank 6 does not rise much and is low, so the pressure inside the storage tank 6 does not become high and the wall thickness of the storage tank 6 is the same as that shown in FIG. It can be made thinner than thick. The compressor 7 can also be made smaller than the compressor shown in FIG. Furthermore, all the members such as the valve 9 can be made small and lightweight, and losses to auxiliary equipment can be reduced. Considering that the solubility of the insulating gas in the insulating material changes greatly depending on the temperature, the significance of burying the storage tank 6 underground will be clearly understood. This is because if the storage tank 6 is installed above ground, the temperature is low in winter, and a large amount of insulating gas dissolves in the insulating liquid, so the amount of insulation required is greater than that required for insulating the transformer body. It must be filled with gas. On the other hand, when the temperature rises in the summer, the insulating gas comes out of the insulating liquid and the internal pressure of the sealed container 1, not to mention the storage tank 6, increases more than necessary. Therefore, the mixed gas in the sealed container 1 is sent to the storage tank 6, so the storage tank 6 is large and has high pressure resistance.
This means that the compressor 7 must be made large.

[Effect of idea]

As explained above, this idea has a simple structure of burying the storage tank underground, so there is little temperature change throughout the year and it is possible to keep the temperature low, so the storage tank does not need to be designed to withstand high pressure. Furthermore, the compressor, valves, etc. can be designed to be compact, which has the effect of reducing auxiliary equipment loss. Furthermore, by burying the storage tank underground, it has the effect of providing additional open space above the tank.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing one embodiment of this invention, Fig. 2 is a schematic diagram showing another embodiment of this invention, and Fig. 3 is a schematic diagram showing another embodiment of this invention.
FIG. 4 is a schematic diagram showing a conventional pressure controlled gas insulated transformer, FIG. 4 is a schematic diagram showing another type of conventional pressure controlled gas insulated transformer, and FIG. 5 is a graph showing solubility characteristics. In the figure, 1 is a sealed container, 2 is a stationary inductor main body, 3 and 3A are media, 6 is a storage tank, and 11 is an underground space. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of claims for utility model registration] (1) Stationary inductor main body, sealed container housing the same,
A medium is sealed in the sealed container to gas-insulate the stationary inductor body, and a storage tank is provided to store and release the medium in order to absorb pressure fluctuations in the sealed container. A pressure-controlled gas-insulated stationary inductor characterized by being buried underground. (2) The pressure-controlled gas-insulated stationary inductor according to claim 1, wherein the medium comprises only an insulating gas that is non-condensable in the operating temperature and pressure ranges. (3) The pressure-controlled gas-insulated stationary inductor according to claim 2, wherein the insulating gas is sulfur hexafluoride (SF ₆ ). (4) The pressure control system according to claim 1, wherein the medium is a mixture of an insulating gas that is non-condensable in the operating temperature range and pressure range and an insulating substance that liquefies or vaporizes. Gas insulated stationary inductor. (5) The pressure-controlled gas-insulated stationary inductor according to claim 4, wherein the liquefied insulating substance has the ability to dissolve an insulating gas. (6) the insulating gas is sulfur hexafluoride (SF ₆ );
The insulating material is fluorocarbon (C ₈ F ₁₆ O)
A pressure-controlled gas-insulated stationary inductor according to claim 5, which is a utility model.