JPS59198811A - Gas insulated electric device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to gas insulated switchgear, gas insulated busbars, conduit aerial power transmission lines, and other gas insulated electrical equipment.

[Prior art]

Gas-insulated electric equipment is constructed by housing a bus conductor, a disconnector, a grounding device, and other live parts in a container filled with an insulating gas such as SF6.

By the way, such gas-insulated electrical equipment must be assembled on-site, inspected in case of failure, and changed internal circuit configuration during testing, and for this purpose, a hand hole is provided in the container, through which the internal conductor can be connected. It is used for assembly, removal, and inspection.

On the other hand, in gas-insulated electrical equipment, if the filling gas contains moisture, the electrical insulation deteriorates, so moisture must be strictly controlled.

On the other hand, if an arc occurs at a place where an arc can occur, such as a disconnector, grounding device, or bus conductor,
Upon contact with the arc, the insulating gas produces decomposition products. These decomposition products have a negative effect on insulation and must be removed as soon as possible.

From this point of view, an adsorbent is housed in the container.

As the adsorbent, materials such as silica gel and activated carbon are used, which are formed into particles and specially processed to increase the surface area as much as possible to increase the adsorption effect.

By the way, when the adsorbent is loaded into a container, its portion naturally protrudes toward the live part, which poses a problem in terms of insulation.

For this purpose, it is common practice to provide a branch pipe in the container and load the adsorbent into the branch pipe. Since this adsorbent adsorbs moisture and decomposition products and its adsorption capacity deteriorates, it must be replaced periodically or temporarily after a specified number of years or after a specified number of operations. In order to facilitate this replacement, the branch pipe is provided with a flange, and the core part is sealed with a hand hole cover.

Recently, gas insulated electrical equipment has been put on the market with a simplified structure in which an adsorbent is housed in the hand hole for assembly and inspection.

According to this configuration, the device can be made extremely inexpensive, but the following new problems have arisen.

The point is that although there are many hand holes for inspection, not all of them are filled with adsorbent.

That is, when replacing the adsorbent on-site for gas-insulated electrical equipment, the following procedure should be followed. First, the voltage application to the equipment is stopped, the insulating gas in the container is removed, the adsorbent is loaded, and the flange of one hand hole is opened to replace the old and new adsorbents. When this is completed, the flange is closed, the inside of the container is evacuated, and then a predetermined insulating gas is filled, and the work is completed.

However, even if the cover of the hand hole is opened with the intention of replacing the adsorbent, there may be cases where no adsorbent is loaded therein, and the user must close it and look for something else. This poses problems such as it takes time to replace the adsorbent, and unnecessary opening and closing of the hand holes may cause gas leaks.

As an example, FIG. 1 shows a single line diagram of a two-line power receiving system having a six-transformer bank configuration. In the figure, 1 is a power receiving line, 2 is a cable head, 6 is a grounding switch, 4 is a disconnector, 5 is a circuit breaker, 6 is a lead wire, 7 is a transformer, and 8 is an instrument transformer.

If this single-line diagram is configured with a standard three-phase gas-insulated switchgear, there will be approximately 60 hand holes, and adsorbent is stored in about 6 to 7 #1 of these, so after delivery, It is very inconvenient to determine which handhole is loaded with adsorbent.

In contrast, conventionally, during on-site assembly, inspection, etc., a manufacturer's engineer would refer to decision drawings and other documents and instruct the adsorbent loading hand hole. However, this makes it difficult for workers and maintenance personnel to easily replace the adsorbent on site.

[Purpose of the invention]

In view of the paper, the present invention is designed so that the hand hole in which the adsorbent is loaded is visually distinguished from others, so that anyone can easily load the adsorbent and know the hand hole, thereby eliminating unnecessary work. The purpose is to provide gas-insulated electrical equipment that does not require

[Structure of the invention]

In the present invention, a charging part is housed in a T container filled with insulating gas, a plurality of branch pipes are made to protrude outward from the container to form a hand hole, and an adsorbent is applied to some of the hand holes. In the loaded type, one hand hole loaded with the adsorbent is visually distinguished from other hand holes,
The present invention will be described below based on actual examples shown in the drawings. [Example] Fig. 2 shows one embodiment of the present invention, in which 11 is a busbar device in a gas-insulated switchgear; It is made up of several connected. Each bus bar element 12 includes a container 16, a branch pipe 14, a hand hole 15 configured here, and a hand hole cover 16.
, an internal conductor 17 , and an insulating gas 18 . Of the hand holes, 15-a, 15-c, 15
-e is loaded with the adsorbent 19, and the other hand holes 15-b and 15-d are not loaded with the adsorbent 19.

Enlarged cross-sectional views of hand holes 15-b and 15-C are shown in FIGS. 3 and 4. An adsorbent cover 20 that protrudes into the insulating gas 18 is attached to the cover 16-c of the hand hole 15-C, and an adsorbent 19 is loaded inside the cover 20. The adsorbent cover 20 is provided with a large number of small holes so that the adsorbent 19 inside cannot pass through. Through these small holes, water and decomposition products mixed into the insulating gas inside the container 16 are transferred to the adsorbent 19. The insulating gas 18 is purified by adsorption.

The cover 16-C is hermetically fixed to the flange 22 of the hand hole 15-C with fasteners 21 such as bolts.

The outer periphery of the flange 22 of the hand hole 15-C loaded with the adsorbent 19 is provided with, for example, a light blue colored coating part 26 to visually distinguish it from the unloaded hand hole 15-b. Similarly, the hand holes 1s-a and 15-8 are provided with colored coating parts 26.

In the above configuration, for example, in order to load or replace the adsorbent 19 on-site, the hand holes 15-a, 15-c each have a flange 22 provided with a colored coating part 26.
It is only necessary to open the cover 16 of 15-e.

Anyone can reliably know which hand holes 15-a, 15-c, 15-e are loaded with the adsorbent 19 by the colored coating section 26, and can open the hand holes in the portions where the adsorbent is not loaded or remove the adsorbent. To provide a gas-insulated electric device that eliminates the waste of searching for a loading hand hole and allows loading, replacing, etc. of adsorbent in a short time.

The above-mentioned hand hole loaded with adsorbent and unloaded hand hole may be distinguished by placing a name plate such as an adsorbent near the hand hole loaded with adsorbent, or as shown in Fig. 5. It is also possible to provide an identifiable symbol processing section 24 as shown in FIG. Furthermore, the above-mentioned identification may be performed by changing the shape and size of only the adsorbent loading hand hole, or by changing the position. Further, the thickness of the flange of the adsorbent loading hand hole may be changed, the diameter of the flange may be changed, and the angle with respect to the container may be changed.

Furthermore, a combination of these may also be used.

If the above-mentioned identification is configured to be performed on the container flange 22 side as in the above embodiment, it is possible to open two or more hand holes at the same time, and even in this case, the absorbent cover may be used to accidentally close hand holes other than the designated locations. Accidents such as this can be prevented. The amount of adsorbent needed at which position is calculated in advance based on the amount of gas and other factors, and the sufficient adsorption effect is achieved only when the adsorbent is loaded exactly as calculated.
Incorrect loading will reduce the effectiveness of the entire device.

[Effects of the Invention] As detailed above, the present invention has a structure in which the handhole loaded with adsorbent is visually distinguished from the handhole not loaded with adsorbent, so that anyone can reliably use the handhole loaded with adsorbent. To provide a gas-insulated electric device that can be distinguished, saves the trouble of searching for an adsorbent loading hand hole, and shortens the time for loading or replacing the adsorbent, and has extremely excellent practical effects.

[Brief explanation of drawings]

Figure 1 is a single line diagram of a two-line power receiving system with 6 transformers;
The figure shows one embodiment of the present invention, and is a simplified front view of a gas-insulated busbar device, Figures 6 and 4 are partially enlarged front sectional views of the one in Figure 2, and Figure 5 shows another embodiment. FIG. 3 is a perspective view of main parts. 13°°゛ Container 14... Branch pipe 15... Hand hole 19... Adsorbent 25, 24... Identification means patent applicant Masakatsuo Nagayamawaki, Representative Director and President of Nissin Electric Co., Ltd. 1 Figure O 7 E1 Ho 3 Ro Roku 4 Sen 5 Figure? Z

Claims (1)

[Claims] (1) A charging part is housed in a container filled with an insulating gas, a plurality of branch pipes are made to protrude outward from the container to form a hand hole, and one of the branch pipes K is loaded with an adsorbent, A gas-insulated electric device characterized in that the handhole loaded with the adsorbent is visually distinguished from other handholes. +21 The gas insulated electrical equipment according to claim 1, characterized in that the hand hole is identified on the flange side.