JPS5927161B2 - On-site assembly method for gas insulated electrical equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for on-site assembly of gas insulated electrical equipment.

Gas-insulated electrical equipment such as gas-insulated switchgear GJ can be transported in bulk if it is small-scale, but if it is large-scale, it is necessary to transport it in parts.

If the product is transported separately, it must be assembled at the installation site, and at this time, dust and moisture may enter the container from the connection points and affect the characteristics of the gas-insulated electrical device.

To prevent this, the installation staff must remove dust in the same way as in factories.
Although it is conceivable to construct a dehumidified room, it is not practical.

For this reason, normally, the connection points of the split elements are sealed in advance with a gas seal at the factory, and the seal is broken at the installation site to perform assembly in a natural atmosphere.

Note that in some cases, the connection location may be covered with a vinyl sheet or the like.

Then, vacuum degas the inside of the container to which the connection point belongs.
After drying, the assembly is completed by filling with an insulating medium such as SF6 gas.

However, even with the above-mentioned sideways method, there is a drawback that the intrusion of dust cannot be completely avoided.

The present invention has been proposed in view of the above points, and will be described below with reference to the drawings.

FIG. 1 (here, 1°2 is the divided first and second elements of the gas-insulated electrical equipment, and the flanges 3,
4, a conductor 7.8 contained in the containers 5, 6, etc.

Note that 9 is a contact for connecting the conductors 7 and 8.

The following procedure is followed to transport the gas-insulated electrical equipment that has been manufactured and adjusted at the factory in parts and assemble it on-site.

First, the SF that was filled in containers 5 and 6 at the factory
6. After recovering the insulating medium such as gas, remove the tightening bolts of flanges 3 and 4 and divide at this point.

Then, the dust-free and dehumidified air in the factory enters the containers 5 and 6.

Of course, in this case, although not shown, other containers are connected to the containers 5 and 6 via insulating spacers, and the insulating medium such as SF6 gas filled in these parts can be recovered. It will not be damaged and will be left in the same condition during transportation.

Note that a portion of this insulating medium may be recovered and transported under reduced pressure to below atmospheric pressure.

Next, the flanges 34 are covered with covers 10, 11 made of vinyl or the like to substantially seal the end connection points of the first and second elements 1, 2, and in this state each element 1.degree. 2 is transported to the site.

To assemble the first element 1 and the second element on-site, first, the containers 5 and 6 are placed close to each other, and the cylinder 12° 13 filled with gas such as dedusted and dehumidified air is placed between the valves 14 and 1.
The containers 5 and 6ζ are connected via 5.

Next, the valves 14 and 15 are opened to send the dedusted and dehumidified gas from the cylinder 12.13 into the containers 5 and 6, as necessary to prevent the cover 10.11 from breaking.J-)
Cover L with covers 10 and 11, and remove covers G) 10 and 11.

Then, while discharging the gas from the ends of the containers 5, 6, the containers 5, 6 are moved close to each other until the flanges 3, 4 come into contact with each other, and the flanges 3, 4 are tightened with bolts.

Here, valves 14 and 15 are closed and cylinders 12 and 13 are moved to containers 5 and 15.
Remove from 6 and complete on-site assembly.

If necessary, the insulating medium such as the dust-removed and dehumidified air in the containers 5 and 6 is replaced with another insulating medium such as SF6 gas which has been dust-removed and dehumidified.

This work is carried out, for example, by transporting SF6 gas, which has a heavy specific gravity, into the container 5.
This process is easy because a pre-calculated amount of air is supplied from the valves 14 and 15 provided at the bottom of 6, and air with a light specific gravity is automatically discharged from there by opening the valves 16 and 17 provided above. be able to.

FIG. 2 shows another embodiment, in which flow baffles 18, 19 close to the inner diameter of the containers 5.6 are each removably housed in the factory at the factory, and flanges 3, 4. These are covered with covers 10 and 11 made of vinyl or the like, respectively, and then transported to the site.

During on-site assembly, the containers 5 and 6 are placed close to each other, and while the dedusted and dehumidified gas is supplied from the cylinders 12 and 13,
If necessary, open J4L in covers io and ii to prevent them from breaking, and remove covers 10 and 11.

Then, the containers 5 and 6 are brought closer to each other while allowing air to leak from the gaps between the baffle plates 18 and 19 and the containers 5 and 6, and the flanges 3 and 4
Immediately before contact (remove baffle plates 18, 19 and flange 3,
4 with bolts to assemble the first and second elements 1 and 2.

In this way, compared to the method shown in FIG. 1, it is difficult for dust to enter the container 5.6, and the consumption amount of the supplied gas can be reduced.

Note that the baffle plates 18 and 19 may be stored in the containers 5 and 6 at the site after removing the covers 10 and 11 while blowing air to remove dust and moisture. 5 and 6, the valve 14. It is also possible to open the IS to supply air with dust-proof and moisture-proof gas.

Further, it is convenient if the baffle plates 18 and 19 are detachably attached to the conductors 7 and 8.

Furthermore, the holes may be made in the covers G) 10 and 11 before air is introduced into the containers 5 and 6.

FIG. 3 shows still another embodiment, in which dust-removed and dehumidified S is filled in adjacent closed containers 20 and 21.
An insulating medium such as F6 gas or compressed air is supplied to the valves 14, 15, 2.
2 and 23 are opened and supplied to the containers 5 and 6 at the connection part,
The connection is made while allowing air to leak from the end of the container.

The other methods are the same as those explained in FIGS. 1 and 2.

According to this, there is no need to prepare a special cylinder.

As detailed above, according to the present invention, it is possible to transport gas-insulated electrical equipment in parts, and when transporting the equipment in parts, foreign substances such as dust and moisture do not get mixed into the container, and furthermore, when it is assembled on-site. , it is possible to prevent dust and moisture from entering the container from the flange part and maintain the performance of gas-insulated electrical equipment in the same way as in the factory-manufactured state, and this is extremely practical, inexpensive, and simple. play.

[Brief explanation of drawings]

FIGS. 1 to 3 are drawings for explaining different embodiments of the present invention, and each is a partially cutaway side view. 1.2... 1st, 2nd element, 3, 4...
...Flange, 5, 6... Container, 7, 8...
...Conductor, 9...Contactor, 10,11...
...Cover, 12,13...Cylinder, 14~
17... valve, 18, 19... baffle plate,
20, 21... Adjacent closed container, 22, 23...
...Communication valve.

Claims (1)

[Scope of Claims] 1. Flanges whose insides are dusted and dehumidified in a factory and sealed with covers are placed opposite each other at the installation site, and the dust-removed and dehumidified gases are supplied into the containers through valves. A gas insulated electrical device characterized in that both covers are removed and the container is advanced until both flanges come into contact with each other while electrifying the gas from both flanges, and the flanges are hermetically fastened together. On-site assembly method 3 2. On-site assembly of gas-insulated electrical equipment according to claim 1, characterized in that a baffle plate having a diameter close to the inner diameter ζ of the container is housed in the container near the flange. Method 3: A method for on-site assembly of gas insulated electrical equipment according to claim 1 or 2, comprising supplying gas from a cylinder into the container from which dust has been removed and dehumidified. 4. A method for on-site assembly of gas insulated electrical equipment according to claim 1 or 2, wherein the gas that has been dedusted and dehumidified and is filled in adjacent closed containers is sent to each of the container ships.