JPH0526892Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the improvement of gas-insulated power transmission lines.

[Conventional technology]

FIG. 3 is a sectional view showing a conventional gas insulated power transmission line disclosed in, for example, Japanese Patent Publication No. 60-24645. In the figure, 1a, 1b, and 1c are metal outer tubes filled with SF ₆ gas, and 2a, 2b, and 2c are conductors, which are supported by insulating support members 3a, 3b, and 3c. 3a is a conical shape, and 3b and 3c are tripod shapes. 4 is a sliding body with conductor 2a and outer tube 1
It is provided to escape the difference in thermal expansion of a. 5
Reference numerals a and 5b are connection pipes that connect the outer tubes 1a and 1b and 1a and 1c, and 6a and 6b are sliding contacts for energizing. 7 is an annular spring for pressing the sliding contacts 6a and 6b, and 8a and 8b are shield electrodes that cover them. 9 is a support member, 10 is an engaging portion, which together with the packing 11 is attached to the insulating support member 3.
a is fixed. Further, the insulating support member 3c is fixed to the connecting pipe 5b. 12 is Patsukin A,
Make sure that spatter does not get in when welding part B. 13a, 13b, 13c are perforated electrodes for an impurity trapping device; these perforated electrodes 13a,
Notches 14a and 14 are provided in 13b and 13c, respectively.
b, 14c are made. This perforated electrode 13
a, 13b, 13c are connecting pipes 5a, 5 at earth potential.
b, and the space 15 between them is
It is a low electric field area. These parts serve as impurity trapping devices.

Next, the operation of the impurity trapping device, which is a feature of this gas-insulated power transmission line, will be explained. Conductors 2a, 2b, 2
When a voltage is applied to c, impurities such as metal particles shown by C jump up from the bottom of the outer tube 1a due to electrostatic force, and undergo a jumping motion due to alternating current voltage fluctuations, gravity, buoyancy, repulsion at the time of a fall collision, etc. do. While this jumping motion continues, if the impurity C falls into the low electric field part of the impurity trapping device, it will not be able to jump up due to insufficient electrostatic force and will be trapped. Therefore, a gas-insulated power transmission line with excellent insulation performance was obtained without deterioration in voltage resistance characteristics due to impurities such as fine metal particles.

[Problem that the invention attempts to solve]

Since the conventional gas insulated power transmission line is constructed as described above, as shown in FIG. The support member 9 must be fixed by welding. Furthermore, after that, it is necessary to weld the perforated electrode 13a of the impurity trapping device to the support member 9. Therefore, there was a risk that the insulators would be contaminated during welding and impurities such as spatter would remain inside.

Furthermore, the inner diameter of the connecting tube 5a is slightly larger than the outer diameter of the outer tube 1a, and the supporting member 9 and the engaging portion 10 to which the insulating supporting member 3a is attached protrude considerably toward the conductor, reducing the electric field strength near the insulating supporting member. There was a disadvantage of being large.

The present invention was devised to solve the above-mentioned problems, and aims to eliminate impurities such as contamination of insulators and spatter caused by welding when assembling internal parts.

[Means for solving problems]

In the gas insulated power transmission line according to this invention, a tube diameter enlarged portion is provided at the end of the outer tube of the unit, and an engaging portion for supporting an insulating support member is provided on the inside of a connecting tube circumscribing this tube diameter enlarged portion. The structure is such that the outer tube and the connecting tube are connected while the insulating support member and the support member with impurity trapping electrodes are sandwiched and fixed between the engaging portion and the end of the outer tube.

[Effect]

The gas-insulated power transmission line in this invention has an outer tube in which an insulating support member and a support member to which a capture electrode is attached in advance are sandwiched between an engaging portion provided inside the connecting tube and one end of the outer tube. By fixing the and connecting pipe, internal welding is not required and the internal contamination due to impurities generated by spatter etc. can be prevented.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings. In FIG. 1, reference numeral 21a is a large diameter portion provided at one end of the outer tube 1a and having a larger inner diameter.
Reference numeral 22 denotes a support member that is fitted along the inner circumferential direction of the connecting tube 5a and has one end in contact with the end of the upper large diameter portion 21a, and this support member 22 has a perforated electrode 13b as an impurity trapping device. The front is also fixed by welding etc. Reference numeral 23 designates an engaging portion that protrudes along the inner circumferential surface of the connecting pipe 5a and supports the insulating support member 3a in cooperation with the support member 22;
A perforated electrode 13a serving as an impurity trapping device is also fixed to the front of this engaging portion 23 by welding or the like. 24 is a fixing means for fixing the connecting tube 5a and the outer tube 1a outside the outer tube 1a while pressing the engaging portion 23 toward the other end of the outer tube 1a. Note that the other symbols are the same as those of the conventional device described above.

With the configuration of this invention shown in FIG. 1, one unit can be assembled as follows.
First, the conductor 2a and the insulating support members 3a and 3b are integrated. This is done by casting the insulating support members 3a, 3b and part of the conductor at the same time and welding the other conductor part. Next, the sliding contact 6a, the annular spring 7, and the shield electrode 8 are attached to the conductor 2a. Further, the perforated electrode 13a is welded and fixed to the engaging portion 23 at the I portion, and the gasket 11
The connecting tube 5a, on which the connecting tube 5a is disposed, is fitted on one side of the insulating support member 3a, and the support member 22, on which the perforated electrode 13b is welded and fixed at the J part, is fitted on the other side of the insulating support member 3a. These are worked outside the outer tube 1a, and are thoroughly cleaned at the end. This is further inserted into the outer tube 1a, and the connecting tube 5a is fitted into the large diameter portion 21a into which the packing 12 is fitted. After this, as shown in Fig. 2, the shoulder of the large diameter part 21a (Fig. 2 shows an example in which the large diameter part is created by welding the short pipe 16 circumscribing the outer pipe 1a at the H part). Putting the flange 17 and blank lid 18 on part H and the end of the connecting pipe 5a, compressing the packing 11 by tightening the bolts 19 and nuts 20, and making a jig that can weld part B. good. In the above embodiment, the welded portion of part B constitutes the fixing means 24.

By adopting such a working method, the welding work after the internal parts have been inserted can be performed only on the outside of the outer end 1a located on the outside of the packing 12, thereby preventing the internal parts of the outer tube from becoming dirty.

Note that the outer tube 1a assembled as described above
The unit consisting of the conductor 2a, insulating support members 3a, 3b, etc. is covered at both ends, and after being transported to the site, installation work is performed to connect it to a longer length. In this case, two adjacent units are connected by a sliding contact at the conductor and welded together using a packing 12 at the connecting tube 5. This work is also carried out outside the outer tube, so there is no risk of contaminating impurities such as spatter entering the gas-insulated power transmission line.

In addition, in the above embodiment, the inner diameter of the connecting pipe 5a at the portion where the insulating support member 3a is installed is increased, which prevents the support member 22 and the engaging portion 23 from protruding and increases the electric field strength near the insulating support member 3a. It also has the effect of preventing this.

In the above example, welding is performed on gas-insulated power transmission line outside pipes and connecting pipes, but flanges are provided at the ends of the connecting pipe and the ends of the mating external pipe, and the bolts and nuts are welded with the packing in between. It is also possible to connect with

Furthermore, it goes without saying that the shapes of the engaging portion 23, the supporting member 22, and other components are not limited to those of the embodiment. Furthermore, although the case has been described in which one conductor is provided within the outer tube, it may be provided with a plurality of conductors.

[Effects of the invention] As described above, according to this invention, when assembling the internal parts, the internal parts are simply inserted into the outer tube, and then the welding is performed outside the outer tube using a packing to prevent impurities from entering. Just do it. Also, during on-site installation, it is only necessary to connect the outer pipe and the connecting pipe externally using packing.

Therefore, contaminants during work do not enter the inside, and a gas-insulated power transmission line with excellent insulation performance can be obtained with simple work.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a main part of a gas-insulated power transmission line according to an embodiment of the present invention. FIG. 2 is a diagram showing a working state using an assembly jig in a part of a gas insulated power transmission line according to another embodiment of the present invention. Third
The figure is a cross-sectional view showing an example of a conventional gas-insulated power transmission line. In the figures, the same parts are given the same symbols, 1a, 1b, 1c are the outer tubes, 2a, 2b, 2c
is a conductor, 3a, 3b, 3c are insulating support members, 5
13a and 13b are perforated electrodes for an impurity trapping device, 21a is a large diameter portion, 22 is a supporting member, 23 is an engaging portion, and 24 is a fixing means.

Claims (1)

[Scope of utility model registration request] an outer tube that surrounds the conductor and contains an insulating gas; a large diameter section with a larger inner diameter provided at one end of the outer tube; a connecting tube connected to the large diameter section;
a support member fitted along the inner circumferential direction of the connecting pipe and having one end abutting the large diameter end of the outer pipe;
An electrode of an impurity trapping device is fixed to the support member in advance and is disposed inside the large diameter portion, and the electrode of the impurity trap is in contact with the other end of the support member to support the force in the tube axis direction of the outer tube. an insulating support member that insulates and supports the conductor; an engaging portion that protrudes along the inner peripheral surface of the connecting pipe and supports the insulating support member in cooperation with the supporting member; and an engaging portion that is previously fixed to the engaging portion; a gas-insulated power transmission line comprising an electrode of an impurity trapping device, and a fixing means for fixing the connecting tube and the outer tube on the outside of the outer tube while pressing the engaging portion toward the other end of the outer tube; .