JPS6046607B2 - Adsorption device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses SF as an insulating medium for electrical equipment having a closed container containing a high voltage conductor.

This invention relates to a suction device for electrical equipment that uses an insulating gas such as gas. SF.

There are various electrical devices that use gas as an insulating gas.
The invention will be described in conjunction with an SF6 gas busbar. SF. Gas busbars are often made by flange-joining hermetically sealed metal containers, but sometimes they are made by welding the hermetically sealed containers for tens to hundreds of meters in length. This invention is now such science fiction. The main target is gas bus lines. SF because moisture has the greatest effect among the impurities that degrade the insulation of electrical equipment.

If there is a lot of moisture in the gas, the moisture will condense inside depending on the weather and operating conditions, lowering the dielectric strength and leading to accidents, so it is necessary to keep the moisture in the insulating gas as low as possible.
For this reason, an adsorption device has been proposed that adsorbs and removes moisture in an insulating gas using an adsorbent. The conventional moisture absorption device is (1
) The adsorbent container is installed inside the airtight container of the equipment, or the adsorbent container is made of a material that allows gas to flow, such as a punched wire mesh, the adsorbent is placed in this container, and it is directly inserted into the equipment's airtight container. This is the way to put it.

The adsorbent sealed in such an adsorbent container comes into contact with the atmosphere and adsorbs moisture during welding of the closed device container, and to prevent this, assembly operations are restricted. Furthermore, in order to ensure the insulation distance, either increase the diameter of the equipment's closed container by the height of the adsorbent container, or
A projection must be provided on the wall of the closed container in which the adsorbent container can be accommodated. If a projecting chamber is provided,
In addition to the need for flanged gates to maintain airtightness, there were other drawbacks such as the risk of electrical corrosion if the contact was poor when buried underground. (2) In cases where the adsorbent is placed inside a hollow conductor or when the adsorbent is housed inside a hollow conductor, the drawback is that, as in case (1), care must be taken to avoid moisture adsorption during assembly when in contact with the atmosphere. There is.

Furthermore, since the inside of the conductor is used, the conductive part that tries to increase the surface that comes into contact with the adsorbent force SF6 gas is reduced, increasing the temperature rise, and there are problems with the heat resistance of the entire device related to the temperature rise. There were some drawbacks, such as: (3) It has been proposed to provide an adsorbent container outside the equipment, or to provide a fluid passageway in a part of the closed container of the equipment, and to connect the adsorbent container containing the adsorbent to the end of this passageway.

In this adsorption device, the adsorbent container is heated and cooled from the outside so that the adsorbent adsorbs and desorbs a portion of the insulating medium, and drying gas from which moisture has been removed is supplied to perform drying.
This device had the disadvantage that the moisture absorbing device was not large because the gas flow was carried out through only one channel. (4)
Use an airtight adsorbent container as a vacuum trigger when filling the gas, and the adsorption surface of the adsorbent inside the adsorbent container appears due to the pressure difference when creating a vacuum inside the device before filling with SF6 gas. Do it like this.

With this method, only the pressure difference equivalent to atmospheric pressure can be used as a pressure difference, so it is not known whether the adsorbent container has completely ruptured and a sufficient adsorption surface has been exposed, and fragments of debris protrude into the equipment. There was a drawback that the product could splatter or scatter. This invention eliminates the above-mentioned drawbacks of the prior art. The object of the present invention is to provide an adsorption device that can effectively use an adsorbent.

The invention will now be described in detail with reference to illustrative embodiments. As shown in Figure 1, the SF6 gas bus bar is made of metal. A high voltage conductor 3 is supported in a closed container 1 via a spacer 1a, and the container 1 is filled with SF6 gas to maintain insulation of the high voltage conductor.

The adsorption device has at least two places, namely a passage 4 communicating with the closed container 1 at both ends, and a valve 5a (at both ends) located in the middle of this passage 4.
It consists of an adsorbent container 6 connected via a first valve and a second valve 5b. In the embodiment shown in FIG. 2, a cooling pipe 10 is used as a device for heating and cooling the adsorbent 7.
and a heating tube 11. After welding of the closed container of SF6 gas busbar is completed, vacuum the SF6 gas busbar.
After gas filling (which may be done using part of the adsorbent container 6 or passage 4), assembly as an SF6 gas bus is completed. When SF6 gas is sealed, it flows into the passage 4 and the adsorbent container 6 at the same pressure as inside the bus bar. After that, the moisture in the SF6 gas inside the bus bar is removed from the wall of the sealed container, the insulator)
The SF6 gas is gradually released from the air and the moisture concentration becomes high.When operating the adsorption device, close the valve 5a and close the valve 5b.
is opened and a heating medium is supplied to the heating tube 11. At this time, the heating temperature is suppressed to about 100°C. Main body 8 due to heating
The SF6 gas in the adsorbent 7 is released, but water is not released because it is strongly adsorbed. Next, when the valve 5a is opened and the valve 5b is closed to supply the cooling medium to the cooling pipe 10, the adsorbent 7 adsorbs the SF6 gas on the busbar side via the valve 5a and also adsorbs the mixed moisture. Furthermore, the valve 5a
When the heating medium is supplied by closing the valve 5b and supplying the heating medium, the SF6 gas from which moisture has been removed is supplied into the bus bar. That is, the SF6 gas in the closed container 1 is moved from the valve 5a side to the valve 5b side through the adsorbent container 6. in this way,
By opening and closing the valve in conjunction with the heating and cooling cycles of the adsorbent container, the S
Moisture, which is an impurity in F6 gas, can be removed. By using or coating the adsorbent container body or the cover connected to the adsorbent container (not shown) with a material that absorbs solar radiation well, it is possible to absorb heat from sunlight without using heating or cooling media. The adsorbent can be heated and cooled.

In addition, as a method for operating the valves without issuing instructions to open and close the valves during heating and cooling from the outside, it is possible to control the opening and closing of the two valves 5a and 5b by detecting the pressure difference between both ends of the valves. .

That is, when the heating cycle is entered with the valve 5a15b closed, a pressure increase occurs. When a pressure difference occurs between both ends of the valve 5b, the valve 5b
so that it is open. When the differential pressure disappears, in other words, when the gas pressures in the bus bar and in the adsorbent container become equal, the valve 5b closes. Valve 5a1 at the beginning of the cooling cycle
5b is assumed to be closed. When cooling progresses and a pressure difference occurs on both sides of the valve 5a, the valve 5a is opened. Valve 5
SF6 gas flows through a until the pressure becomes equal. When the differential pressure disappears, the valve 5a is closed and the heating cycle begins. Note that synthetic zeolite is preferably used as the adsorbent.
In this way, by utilizing the properties of the adsorbent as is to remove moisture, which is an impurity in the bus bar, the life of the equipment can be stably maintained for a long time.

According to this invention, 1) Since the circulation path is made by the adsorbent itself, there is no need for an operating mechanism and there are fewer occurrences of failures.

2) Since the adsorbent container can be provided outside the device, the adsorption device (channel adsorbent container) can be placed above ground even if it is buried underground. 3) It is easy to replace the adsorbent container.

4) Does not affect the insulation distance at all.

It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view schematically showing the adsorption device of the present invention combined with an SF6 gas busbar, and FIG. 2 is an enlarged cross-sectional view showing the vicinity of an adsorbent container of one embodiment of the adsorption device of the present invention. . DESCRIPTION OF SYMBOLS 1... Metal sealed container, 1a... Spacer, 2... SF6 gas, 3... High voltage conductor, 4... Channel,・5a, 5b...Valve, 6...Adsorbent container, 7...Adsorbent,
8...Container body, 9...Outer covering, 10.
...Cooling pipe, 11...Heating pipe.

Claims (1)

[Claims] 1 A sealed container for storing a high voltage conductor, a first channel communicating with one end of the sealed container, a second channel communicating with the other end of the sealed container, containing an adsorbent for adsorbing moisture, and
communicates with the first flow path via the first valve;
an adsorbent container communicating with the flow path through a second valve,
The adsorbent container is heated with the first valve closed and the second valve opened, and the gas in the adsorbent container is moved from the second flow path into the closed container. With the first valve open and the second valve closed, the adsorbent container is cooled, and the gas in the closed container is moved into the adsorbent container. An adsorption device in which the moisture contained therein is adsorbed by the adsorbent.