JPS589482Y2 - Flexible conduit aerial power transmission line - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a flexible conduit aerial power transmission line.

Conventionally, conduit aerial power transmission lines have been constructed with corrugated tubes for both the inner and outer tubes in order to obtain flexibility.

Such flexible conduit aerial power transmission lines were developed for the purpose of being transported by winding drums, but there are restrictions on the size of the drum due to road conditions and other reasons. There are restrictions on the outer diameter of medium transmission lines.

For this reason, it has become impossible to transport ultra-high voltage, large capacity flexible conduit aerial power transmission lines by drum winding, and the length of production units at factories is 10 m to 15 m.

This must be connected and installed on-site.

However, since the connections must be made on-site, especially the inner pipes, which must be connected in such a way that large currents can flow through them, on-site work is extremely complicated, making it difficult to realize highly reliable aerial power transmission lines. Become.

Of course, this type of problem has been solved to some extent with non-flexible pipeline aerial power transmission lines.

However, the advantages of adding flexibility to conduit aerial power transmission lines are extremely large, and there is a strong demand for improvements in on-site connection and work.

This idea is an ultra-high voltage system that greatly improves on-site connection work.
An object of the present invention is to provide a large-capacity flexible conduit aerial power transmission line.

In order to manufacture the flexible conduit aerial power transmission line of this invention, first, the flexible conduit aerial power transmission line is manufactured by coaxially supporting the internal corrugated tube 1 and the external corrugated tube 2 with spacers 3. The manufacturing unit length is set to a length that can be transported without being wound on a drum (usually 10 m to 15 m).

While laying this on the on-site installation route, only the external corrugated pipe 2 is connected by flanging or welding.

After connecting several sets, the twisted conductive wire 4 is inserted into the inside of the internally corrugated tube and used as a current-carrying conductor.

At this time, in order to facilitate insertion of the twisted conductor wire, it is preferable to incorporate the pilot wire into the internally corrugated tube.

Since the internal corrugated tube is used only for voltage shielding, there is no need to connect it when connecting the external corrugated tube.

Since the flexible conduit aerial power transmission line of this invention has a short manufacturing unit length, there are no major problems in manufacturing even if the shape and fixing method of the spacer are not particularly specified.

That is, any of the post type, disk type, and cone type can be used as the spacer type.

An embodiment of this invention is shown in the accompanying drawings.

This embodiment uses a disc type 3 as a spacer and a flange 5 to connect the external corrugated tubes 2, 21.

The internally corrugated tubes 1 and 1 do not need to be connected as described above.

However, a shield fitting 6 may be used to avoid electrical effects at the ends.

According to this invention, the following great effects can be obtained as a flexible pipeline aerial power transmission line even for ultra-high voltage, large capacity pipeline aerial power transmission lines that cannot be transported by drum winding.

(1) It is extremely easy to install on routes with gentle curves.

(2) It is self-absorbing against thermal expansion and contraction, and no expensive expansion/contraction connections are required.

(3) There is no need for high installation precision as with conventional pipeline aerial power transmission lines.

(4) On-site connection work is extremely easy.

In particular, if a flange connection is adopted, there is no work that generates dust, and the work time required for connection is less than one hour per location.

[Brief explanation of drawings]

The accompanying drawing shows one embodiment of this invention, and is a longitudinal sectional view thereof. L1'; Internally corrugated tube, 2.2'; Externally corrugated tube, 3°31
; Spacer; 4; Stranded wire conductor; 5; Flange; 6; Shield fitting; 7; Insulating gas; 8: Anticorrosion layer.

Claims (1)

[Scope of utility model registration request] It is a flexible conduit aerial power transmission line in which two corrugated tubes are coaxially supported and insulating gas is sealed. The unit is installed along the on-site installation route, and the outer corrugated tube ends are connected by flanges or welding, and the inner corrugated tube has a stranded conductor inserted inside. A flexible conduit aerial power transmission line, characterized by
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