JPH0595615A - Gas-insulated transmission line - Google Patents

Abstract

PURPOSE:To provide a gas-insulated transmission line having a curved part with a large radius of curvature economically while holding high reliability. CONSTITUTION:In the curved part of a gas-insulated transmission line, a container 16, to which flanges 19 having annular gasket grooves 22 are attached in the manner of inclining from the direction rectangular to the axial direction, and a gas-insulated bus composed of rectilinear conductors connected by sliding contacts 12, which are attached to the conductors in the manner of inclining from the axial direction, are constituted into a polygonal shape extending along a circular arc. The opening of the flange 19 is oval but the groove 22 has a predetermined diameter and is obtained by working in the surface of the flange. Further, the connection 12 of the conductor is made to protrude from the container 16 and is provided with a predetermined angle of inclination so as to coincide with the central axis of an adjacent conductor 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated transmission line.

[0002]

2. Description of the Related Art FIG. 7 is a cross-sectional view showing an example of a conventional gas-insulated transmission line having a bent portion as disclosed in, for example, Japanese Patent Publication No. 58-57050. In the figure, 1 is a bending unit,
2, 3 are connecting units on both sides, 4, 5, 6 are containers, 7,
Reference numerals 8 and 9 are conductors, and 10 and 11 are insulating spacers. The insulating spacer 10 is slidable with respect to the container 4, and the insulating spacer 11 is fixed to the containers 2 and 3. Reference numeral 12 is a sliding contact, and 13 is an electrode for relaxing the electric field at that portion. 14 is SF
It is an insulating gas such as ₆ gas.

Units 1 to 1 of these gas-insulated transmission lines
3 is connected by welding the containers 4 to 6 on site at the point indicated by W. In this case, between the conductors 7 and 8 and between the conductors 7 and 9 are easily connected by pushing the sliding contact 12 so that current can be supplied. The conductors 7 to 9 are supported in the SF ₆ gas by the insulating spacers 10 and 11 and endure high voltage. In this gas insulated transmission line, a temperature difference occurs between the containers 4 to 6 and the conductors 7 to 9 during use, which causes a difference in thermal expansion. However, the sliding type insulating spacer 10 and the fixed type insulating spacer 11 are essential. Used for conductors 7-9
The gap is dealt with by the sliding contact 12 so that an unreasonable force is not applied to each part.

[0004]

Since the conventional gas-insulated transmission line is constructed as described above, it is necessary to manufacture a container dedicated to bending at the bending portion. Recently, it has been planned to construct a cave with an excavator deep underground and to install a gas-insulated transmission line in it. In this case, due to the construction method, it is easy to build a bend with a large radius of curvature in the cave,
To make such a bent part with a conventional container,
There was a problem that the cost would be very large.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a gas-insulated power transmission line with improved reliability.

[0006]

In a gas-insulated transmission line according to the present invention, a flange portion inclined to the direction perpendicular to its axis is provided at an end of a straight container, and a gasket mounting portion having a predetermined diameter is provided on the flange portion. Processing, the connection portion of the conductor inclined with respect to the axial direction is provided at the end portion of the straight conductor, and the curved portion having a large radius of curvature is formed in a polygonal shape.

[0007]

Since the gas-insulated transmission line according to the present invention is constructed as described above, the unit can be easily processed and the length of the unit can be easily increased.

[0008]

EXAMPLES Example 1. An embodiment of the present invention will be described below. In FIG. 1, reference numeral 15 is a gas-insulated transmission line unit, and 16 is a container, which has a right cylindrical shape. 17 is a conductor, which is also linear. 18 is an insulating spacer. Reference numerals 19 and 20 denote flanges on the container end, which are formed, for example, as shown by θ / 2 in FIG. Grooves for mounting the gasket indicated by 21 on the joint surface of the flanges 19 and 20
22 and the contact surface 23 are machined. The groove 22 and the contact surface 23 are shown in FIGS. 3 and 4 (I-I sectional view of FIG. 3) and FIG. 5 (II-II of FIG. 3).
As shown in the cross section), it is made in the shape of a circumferential band like straight D ₁ and D ₂ . The inner and outer peripheries of the flanges 19 and 20, the pitch circles of the bolt holes, and the like may be machined into circles. Reference numeral 24 is a spacer for adjusting the angle so that the sliding contact and the shield 13 thereof can slide in the direction of the adjacent conductor 17.

In the gas-insulated transmission line of the present invention, the unit 15 shown in FIG. 1 is connected as shown in FIG. 2 to form a bent portion of the gas-insulated transmission line having a large radius of curvature R. For example, if the radius of curvature R is 45 m and the curved portion changes in 90 ° direction,
It can be constructed by connecting six units 15 of the same shape having a length l of about 10 m. Each unit has flanges 19 and 20 that are inclined by θ / 2 at both ends of the linear container 16. For example, in the example of FIG. 2, θ = 15 ° and θ / 2 = 7.5 °.
Has an elliptical shape, and the ratio of the major axis E to the minor axis D (= the inner diameter of the container 16) is E / D = 1.0086. Therefore, even if the inner diameter D _{3 of the} flanges 19 and 20 is not an ellipse that matches E and D, a large step does not occur even if it is a circle of D ₃ ≈D (for example, the step is 2.5 mm when the diameter D = 60 cm). If the part is slightly rounded, there will be no problem in terms of withstand voltage. Therefore, even if the pitch circle D ₄ of the O-ring groove 23 and the contact surface 24 bolt hole is set as a circle, the outer diameter of the flange does not increase by 1%, and the merit of processing into a circular shape is remarkably large. That is, the circular processing can be performed by rotation, the smooth surface can be processed with high accuracy, the cost is low, and the sealing surface of the gasket is highly reliable with no risk of leakage.

Embodiment 2. Further, the conductor 17 is also linear and easy to manufacture, and since the sliding contact 12 is used for connection, it is easy to connect at the site simply by pushing in the mating conductor 17, and the sliding contact 12 is angled. Since the same type of unit can be used only by using the adjusting spacer 24, mass production works can be used. As described above, according to the present invention, a straight pipe container is used without using an expensive container (price several times as much as a straight pipe) such as a bent pipe, and the same kind of parts having a shape easy to process is used. Since a bent portion having a radius of curvature can be formed, it can be manufactured very economically and reliability is improved. In FIG. 6, instead of using the sliding contact 12 and the shield 13 of FIG.
Another embodiment of the invention using the shield 28 and the shield 28 is the same as FIG. 1 in other parts. The angle adjusting spacer 24 is also unnecessary.

[0011]

As described above, according to the present invention, the bent portion of the gas-insulated power transmission line has a flange attached to the container end of the straight tubular container at a right angle to the axial direction, and the flange is attached. Since it has a ring-shaped gasket groove and a gasket contact surface that are processed into an annular shape, and the contact portion that is installed by inclining a linear conductor is configured, a gas-insulated transmission line with a large radius of curvature is inexpensive and reliable. Can be made high.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a side view of the flange showing the view III-III in FIG.

FIG. 4 is a sectional view showing a IV-IV section in FIG.

FIG. 5 is a sectional view showing a VV section in FIG.

FIG. 6 is a sectional view showing another embodiment of the present invention.

FIG. 7 is a sectional view of a conventional gas-insulated transmission line.

[Explanation of symbols]

 11 Insulating spacer 12 Sliding contact 16 Container 17 Conductor 19 Flange 22 Groove (gasket mounting part)

[Procedure amendment]

[Submission date] August 5, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Claims (2)

[Claims] 1. A plurality of right cylindrical metal containers are gas-separated and connected to each other by an insulating spacer, and the container and a conductor penetrating the insulating spacer are supported by the insulating spacer, and are placed in the container. In a gas-insulated power transmission line in which a gas-insulated bus is formed by enclosing an insulating gas, and a predetermined inclination angle is provided between the adjacent containers so that the whole is arcuate, and the end face of the container is the above-mentioned A gas-insulated power transmission line comprising a tubular body formed at an inclination angle, a flange portion having a surface parallel to an end surface of the tubular body, and a gasket mounting portion having a predetermined diameter on the flange portion. 2. A plurality of right cylindrical metal containers are gas-separated and connected to each other with an insulating spacer, and the container and a conductor penetrating the insulating spacer are supported by the insulating spacer, and are placed in the container. In a gas-insulated transmission line in which a gas-insulated bus is formed by enclosing an insulating gas and a predetermined inclination angle is provided between the adjacent containers so that the whole is arcuate, and the conductor is connected to the gas-insulated transmission line. A gas-insulated power transmission line, wherein the gas-insulated transmission line is arranged so as to project from an end surface of the container and to match the center of the conductor in the adjacent container.