JPH0214098Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an overhead power transmission line that can easily form a composite optical/power cable line.

In recent years, fiber optic cables used as signal transmission cables have been installed along overhead power transmission lines to monitor, control, and protect power systems between electrical stations such as power plants and substations, or at intermediate points on power transmission lines. It is attracting attention for its application to various communication systems, such as observing weather conditions and monitoring abnormal phenomena such as vibrations and lightning strikes using television cameras. When installing the optical fiber cable, it is integrated into the overhead ground wire installed above the overhead power transmission line in order to prevent damage from external forces, lightning strikes, etc. This is considered to be a strong possibility.

By the way, the above-mentioned combination of the optical fiber cable and the overhead ground wire often has to be done after the construction of the overhead power transmission line due to late requests.

However, in conventional overhead power transmission lines, when changing the existing overhead ground wire to a composite line with optical fiber cable, first remove and remove the existing overhead ground wire from the support tower, and then combine the optical fiber cable in advance. The so-called optical fiber composite overhead ground wire must be newly re-erected across the support towers, which not only makes the erection work large-scale and complicated, but also requires the existing overhead ground wire to be scrapped. Therefore, there is a problem that there is a large economic loss.

This idea was developed in view of the above points, and it is possible to immediately change the existing overhead ground wire to an optical fiber composite overhead ground wire, which is combined with an optical fiber cable, as necessary, without disposing of the existing overhead ground wire. The purpose of this project is to provide a new overhead power transmission line that can

An embodiment of this invention will be described below with reference to FIGS. 1 to 3.

Figure 1 shows the overall configuration of an overhead power transmission line, in which an overhead power transmission line 3 and an overhead ground wire are connected between a large number of support towers 2 (only two are shown in the drawing) such as steel towers. 4 has been constructed.

As shown in FIG. 2, the overhead ground wire 4 has a structure in which a conduit 5 such as an aluminum pipe is at the center, and a metal stranded wire layer 6 made of aluminum-covered steel wire is provided on the outside thereof. Hollow part 5 of the pipe line 5
a, a lead wire 7 made of a metal rope or the like having an outer diameter smaller than the inner diameter of the conduit 5,
It is inserted over the entire length of the overhead ground wire 4.

As shown in FIG. 1, this overhead ground wire 4 is tension-supported by each support tower 2. As shown in FIG. 3, the tensile support portion of the overhead ground wire 4 in each support tower 2 is such that the ends of each overhead ground wire 4 on both sides of the support tower 2 are supported via a retaining clamp 8 and a retaining rod 9, respectively. It is secured and fixed to the top of the tower 2, and the overhead ground wires 4 on each side centering on the support tower 2 are electrically connected to each other via jumper wires 10 connected between the retaining clamps 8 at each end. and is grounded via the support tower 2. Further, the end of the lead wire 7 is drawn out from the end of the overhead ground wire 4, and is temporarily fixed 11 at an appropriate position on the support tower 2.

Now, in the overhead power transmission line having the above configuration, when changing the above-mentioned overhead ground wire 4 to an optical fiber composite overhead ground wire combined with an optical fiber cable, first, the lead wire 7 The temporary fixation 11 is released, and the optical fiber cable F is attached to the end of the lead wire 7.
Connect 12 (see the chain line in Figure 3).

On the other hand, in the other support tower section of the section to be changed, the lead wire 7 is similarly temporarily fixed 1.
1 is unwound, and the end of the lead wire 7 is connected to a winding device (not shown) such as a winch. Thereafter, when the winding device is operated to wind up the lead wire 7, the lead wire 7 is pulled out from the overhead ground wire 4, and the optical fiber cable F is sequentially inserted into the hollow part 5a in the overhead ground wire 4. The overhead ground wire 4 is brought in and combined with the optical fiber cable F.

The end of the optical fiber cable F inserted into the overhead ground wire 4 is pulled out from the overhead ground wire 4 at the support tower portion and exposed, and is connected to a desired device such as an optical cable connector.

As explained above, according to this invention, a hollow part is formed inside the overhead ground wire installed above the overhead power transmission line, and the lead wire is inserted through the hollow part. Accordingly, by drawing an optical fiber cable into the overhead ground wire using the lead wire, the existing overhead ground wire can be changed to an optical fiber composite overhead ground wire that is combined with an optical fiber cable. A light/power composite cable line can be easily constructed without having to dispose of any existing overhead ground wires.

Moreover, the pulling in of optical fiber cables,
Since this can be done only by winding up the lead wire, the time required for high-place work can be shortened and the safety of the work can be ensured.

In addition, the above-mentioned composite optical fiber cable is
Since the process can be performed between arbitrary support towers, it is possible to easily combine the desired sections of the overhead power transmission line.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
2 is a side view of the overhead power transmission line, FIG. 2 is a cross-sectional view of the overhead ground wire, and FIG. 3 is a side view of the tensile support portion of the overhead ground wire at the top of the support tower. 2... Support tower, 3... Overhead power transmission line, 4... Overhead ground wire, 5a... Hollow part, 7... Lead wire.

Claims (1)

[Scope of utility model registration request] An overhead ground wire 4 is installed above the overhead power transmission line 3 installed between the support towers 2, and a hollow part 5a is formed inside the overhead ground wire 4. A lead wire 7 is inserted, and both ends of the lead wire 7 are pulled out to the outside at the tensile support portion of the overhead ground wire 4.
An overhead power transmission line that is temporarily fixed to the upper part of the support tower 2.