JPS60158403A - Disposing method in insulator part of optical fiber and insulator with optical fiber - Google Patents

Abstract

PURPOSE:To decrease the surface leakage insulating distance of an insulator and to permit efficient application by conducting an optical fiber from the high tension side to ground side of the insulator so as not to detach the same from the surface of the insulator. CONSTITUTION:An optical fiber is so conducted from the high tension side to ground side of an insulator as not to detach from the surface of the insulator. More specifically, an optical fiber 11 is so conducted as to be passed into an adjacent groove 8a over the crest part 8c of pleats, to run around the groove 8a of the pleats, to be conducted from the side face to the top face of a shade part 8, to run round in the spiral groove 8b on the top surface and to be spirally wound on the outside circumference of a cap 9 by which the fiber is conducted to the adjacent insulator. The surface leakage insulating distance of the insulator is prevented and efficient application is made possible by the above-mentioned constitution.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a method for installing optical fibers in an insulator section, which is mainly used when forming an optical fiber transmission system using a power transmission line network. be.

[Prior art]

In recent years, ground wires have developed optical fiber composite power lines and optical fiber composite racks that house optical fibers inside power lines and overhead ground wires, or attach or spirally wind optical fibers to the outside of them. The formation of an optical fiber transmission system using a power transmission line network is being put into practical use.

By the way, power lines are supported in an insulated state by insulators on the towers of power transmission lines, but when it becomes necessary to introduce optical fibers from the optical fiber composite power line to an optical fiber junction box installed on the tower, the optical The fiber is led from the high voltage side to ground ll11 in the insulator section. -Also,
When installing a sensor that detects current, voltage, etc. on a power line and connecting an optical fiber led from this sensor to the west fiber of an optical fiber composite overhead ground wire, connect the optical fiber to the power line in exactly the same way as above. In the insulator part that supports
It is necessary to lead it from the high voltage side to the ground side (tower side).

By the way, it is necessary to maintain the surface leakage distance from the high voltage side to the ground side of the insulator that supports the power line in an insulated state to a certain value or more, but as mentioned above, the optical fiber is When leading from the high voltage side to the ground side,
If the optical fiber is simply run parallel to the tension-resistant insulators, the leakage insulation distance on the insulator surface will essentially be the length of the portion of the optical fiber parallel to the tension-resistant insulators, and the power line support section will not be able to provide enough insulation. A problem arises in that adequate insulation cannot be ensured.

[Purpose of the invention]

This invention was made against the above background, and is useful when forming an optical fiber transmission system using a power transmission line network, etc., by connecting optical fibers to high voltages of insulators without shortening the insulation distance due to surface leakage of insulators. The purpose of this is to make it possible to lead from the ground side to the ground side.

[Specific structure of the invention]

The method of arranging an optical fiber in an insulator part of the present invention is characterized by guiding the optical fiber from the high voltage side of the insulator to the ground side without leaving the surface of the insulator. explain.

FIG. 1 shows a steel tower portion of a power transmission line, and reference numeral 1 denotes an optical fiber composite power line (hereinafter simply referred to as the power line).
It is supported by the arm 4a of the steel tower 4, and the electric power @
1 are electrically connected via jumper wires 5. M
The power line 1 is one in which an optical fiber is housed inside the power line, or an optical fiber is attached or spirally wound around the outer periphery of the power line. A fiber optic transmission system is formed using this method. Although not shown in FIG. 1, an optical fiber is branched from the power line 1 at the retaining clamp part 2 and pulled out. It is connected to an optical fiber junction box 6 provided at 4.

The details of the tension insulator chain 3 will be explained with reference to Figs. It has a similar structure, the main part of which is the porcelain insulator 7, which consists of a branch 8 and a cylindrical part with a metal camp 9 attached.
A steel connecting bottle 10 is fixed to the cylindrical portion with cement. A socket 9a is formed in the camp 9, and the socket 9a is engaged with the head 10a of the connecting bottle 10.
0 is engaged with the socket 9a to connect each insulator to form an insulator chain. .

A pleat having a plurality of concentric grooves 8a is formed on the back surface (lower side in the figure) of the branch 8. Although the above insulator structure is a common one, this insulator is further provided with a spiral groove 8b on the upper surface of the branch 8.

In the present invention, the optical fiber is connected from the high voltage side of the insulator (on the side of the retaining clamp 2 supporting the power powder 1, the lower side in Figure 2) to the ground side (on the side of the steel tower 4, on the upper side of the insulator in Figure 2). However, in this embodiment, the optical fiber 11 is guided so that it does not separate from the folds, as shown in Fig. Groove 8
a, then lead it from the side of the branch 8 to the top surface, and as shown in Fig. 3, pass it through the spiral groove Bb on the top surface, and then spirally wrap it around the outer periphery of the camp 9 and guide it to the top surface of the branch 8. In addition, the connector part 11a of the optical fiber 11 is guided to the mating insulator.
is provided at the outer periphery of camp 9, and the optical fiber 1 is provided in the same manner below.
1 along the surface of the insulator, and connect the optical fiber 1 to the ground side.
1 is leading.

The optical cable 11 guided to the ground side is then connected to the connection box 6.

The optical fiber 11 is only an optical fiber, and the material is coated with a plastic resin such as polyethylene that has excellent insulation properties, and the upper surface side of the insulator is coated with silicone resin after passing the optical fiber 11 through the spiral groove 8b. etc. to make the surface smooth and prevent dust from accumulating.

In addition, between adjacent insulators, the outer surface of the optical fiber 11 including the connector part 111L should be coated with metal such as copper (the standard value of this metal is indicated by llb), or the optical fiber should be wrapped in a metal tube or the like. We aim to strengthen the through-hole strength.

Note that the spiral groove 8b on the top surface of the insulator and the pleat groove 8a on the back surface have a radius of curvature that does not increase the transmission loss of the optical fiber 11.

When the optical fiber 11 is arranged along the tensile insulator chain 3 as described above, the optical fiber 11 is not separated from the surface of the insulator, so the length of the optical cable 11 is the same as the length that the tensile insulator chain 3 originally has. The surface leakage insulation distance will not become shorter than the surface leakage insulation distance, and therefore, the surface leakage insulation distance of the insulator will not be shortened due to the arrangement of the optical fiber 11. Therefore, the tensile insulator chain 3 ensures sufficient insulation, there is no drop in surge voltage, and there is no problem such as the optical fiber 11 being adversely affected by heat during a lightning strike.

FIG. 5 shows another embodiment, in which the groove 8a formed on the upper surface of the insulator is not spiral but substantially linear. This is a simple method if sufficient insulation can be obtained without creating a spiral shape.

Figure 5 shows yet another embodiment, in which case:
A hole 8e is made in a part near the center of the cylindrical part 8 of the insulator, and an optical fiber 11 is passed through this hole 8e.After the optical fiber 11 is passed through the hole 8e, it is filled with an insulator as described below. , the cap 9 is derived in the same manner as in the previous embodiment. Note that the optical fiber 11 is an optical fiber or is coated with a plastic resin such as polyethylene, and between adjacent insulators,
Forming a metal coating 11b on the outer surface of the optical fiber 11 including the connector portion 11a for strength reinforcement, or passing the optical fiber through a metal tube, etc. are the same as in the embodiments shown in FIGS. It is similar to

Epoxy resin, polyethylene resin, sulfur hexafluoride (SF6), etc. are suitable for the insulator filled in the hole 8e. Epoxy resin has the advantage that it can be processed at room temperature, and polyethylene resin has particularly excellent insulation properties. The groove shape as shown in the figure can be made, but the former is superior in that it is easy to process.
The latter is superior in that it has a high peel strength between the insulator and the filler.

In this embodiment, the continuity of the outer surface of optical fiber 11 is
Since the hole 8e is blocked by the hole 8e and the hole 8e is sufficiently insulated, no surface leakage current flows along the entire length of the outer surface of the optical fiber 11. Therefore, the optical fiber 11 It does not reduce the surface leakage insulation distance.

In the example, it is applied to a tension-resistant insulator and is light.
It can be applied to the case of a suspended insulator chain, and can also be applied to the case where an insulator alone is used instead of an insulator chain.

When carrying out the method of the present invention, it is possible to use an insulator with an optical fiber (or insulator chain) in which an optical fiber is attached to the insulator in advance by the method described in the above embodiment. In that case, a method is adopted in which both ends of the optical fiber are connected to other optical fibers via connectors at the construction site. Alternatively, a method may be adopted in which the optical fiber is attached to the insulator at the construction site.

〔Effect of the invention〕

As explained above, according to the present invention, the optical fiber is guided from the high voltage side of the insulator to the ground side without leaving the surface of the insulator, so that the optical fiber can be arranged along the insulator. There is no accompanying reduction in insulation distance due to surface leakage.

Further, according to an insulator with optical fibers in which the optical fibers are arranged so as not to separate from the surface of the insulator, it becomes possible to perform the above-described method for casting optical fibers efficiently.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a view of the vicinity of a transmission line tower, Fig. 2 is a main part of the tension insulator chain in Fig. 1, and Fig. 3 is a diagram of the insulator in Fig. 2. A top view, FIG. 7 is a back view of the insulator in FIG. 1, FIG. 5 is a top view of the insulator showing another embodiment, and FIG. 6 is a main part diagram of a tension-resistant insulator chain showing still another embodiment. , FIG. 7 is a diagram of one embodiment of the hole in FIG. 6, and FIG. R is a diagram of another embodiment of the hole. 1... Optical fiber composite power line, 3...
Tensile insulator, 7...Magnetic insulator, 8...
・Cylinder part, 8a...Fold grooves, 8b, 8d...
...Groove, 8c...Mountain part of fold, 8e...
... Hole, 9 ... Camp, 11 ... Optical fiber, lla ... Connector section, 11b ...
・・・Metal cover.

Claims (2)

[Claims] (1) A method for placing optical fibers in the insulator part, which is patented for guiding the optical fiber from the high voltage side of the insulator to the ground side without leaving the surface of the insulator. (2) An optical fiber insulator characterized in that the optical fiber is arranged from the high voltage side of the insulator to the ground side without separating from the surface of the insulator.