JPS60162203A - Optical fiber taking-in structure of optical fiber compound overhead power transmission line - Google Patents

Abstract

PURPOSE:To maintain excellent dielectric strength between the high voltage and low voltage sides of the optical fiber compound power transmission turnk line by taking the optical fiber separated from said trunk line into a supporting structure side through glass which supports a conduction part. CONSTITUTION:Optical fiber compound power transmission lines 1 at both sides of the supporting structure supported on the arm 4a of a supporting structure such as a steel tower in an insulation state are connected together electrically through a jumper line 5. The optical fiber 7 is separated from the optical fiber compound power transmission trunk line near its connection part with the jumper line 5. This optical fiber 7 is taken into the supporting structure side through the glass which supports the conduction part 5 without being tensed by the optical fiber compound power transmission trunk line 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention provides an optical fiber composite in a portion of an overhead power line support structure such as a steel tower when forming an optical fiber transmission system using an overhead power line network. This invention relates to an optical fiber introduction structure for introducing an optical fiber from a power line into a support structure.

[Prior art]

In recent years, optical fiber composite power lines have been developed in which optical fibers are housed inside the power line, or optical fibers are attached or spirally wound outside the power line, and this has led to the development of optical fiber transmission systems that utilize overhead power line networks. It is becoming practical to form . In such an optical fiber transmission system, when connecting the optical fibers of the optical fiber composite power line, or when transmitting information from sensors installed near the tower, etc., to the optical fiber transmission system, it is necessary to It becomes necessary to insert the optical fiber of the fiber composite power line into the steel tower and guide it to the optical fiber junction box attached to the steel tower. By the way, in this case, if the optical fiber combined with the power line is separated from the power line and simply inserted into the tower as it is, the insulation distance between the power line (high-voltage charging part side) and the tower (ground side), that is, the distance between the two The leakage insulation distance along the surface of the insulation existing in The actual leakage insulation distance becomes shorter than the original leakage insulation distance along the surface of the insulator, and there is a risk that the meaning of insulating and supporting the power line with the insulator will be lost. Therefore, a problem arises in that sufficient insulation cannot be guaranteed at the power line support portion.

[Purpose of the invention]

This invention was made against the above background, and when forming an optical fiber transmission system using an overhead power line network, the optical fiber composite power line (high voltage charging part) side and the support structure such as a steel tower ( (grounding part) side while ensuring sufficient insulation distance for leakage on the surface of the insulator existing between the two. The purpose is to introduce the optical fiber separated from the power line into the support structure.

(Specific Configuration of the Invention) The present invention provides for mutually connecting optical fiber ME power lines on both sides of the support structure, which are supported in an insulated state by a support structure such as a steel tower, with a jumper wire, and The optical fiber is separated from the main line of the optical fiber composite power line near the connection point with the jumper wire, and the optical fiber is taken into the support structure side through the insulator that supports the conductive part without being subjected to the tension of the optical fiber composite power line. It is characterized by this.

In the above, jumper wires not only mean conductive wires that electrically connect tension-supported power lines to each other, but also
As shown in Embodiment K (see FIG. 8), which will be described later, it also includes conductive wires that electrically connect the ends of the power lines when they are suspended and supported.

In addition, the above-mentioned conductive portion includes a jumper wire when the power line is under tension support, and a metal mechanical force sharing member (see Fig. 8) that is different from the jumper wire when the power line is suspended. It is something that

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows the tower part of an overhead power transmission line, and 1 is an optical fiber composite power line (hereinafter abbreviated as composite power line). The main power lines (referring to the conductor portions) of the composite power line 1 on both sides of the steel tower 4 are electrically connected to each other via jumper wires 5 . The intermediate portion of the jumper ls5 is supported by the arm 41 via the insulator 6. The composite power line 1 is a main power line with an optical fiber housed inside it, or an optical fiber attached to the outer periphery of the main power line, and power is transmitted through the optical fiber of the composite power line 1. An optical fiber transmission system using a line network is formed.

The fibers 7 of each party in the optical fiber composite power line l on each side of the left and right sides around the arm 4a of the steel tower are held by retaining clamps 20.
The composite power line 1 is separated from the main power line at each section, and the separated optical fibers 7 are guided along the jumper wire 5 and then passed through the insulator 6 to the steel tower 4 as shown in FIG. It is guided to an optical fiber junction box 8 provided inside.

The details of the insulator 6 are explained below in FIG. 4. This insulator 6 consists of a porcelain insulator made of a shaft portion 6& and a cavity 6b integrally provided in multiple stages on the outer periphery of the shaft portion 6&. A through hole 60 is bored in the center of the shaft portion 6&. After inserting the optical fiber 7 into the through hole 6c, the through hole 6o
is filled with an insulating material 6d such as epoxy resin. In addition,
FIG. 4 shows only the porcelain insulator of the insulator, to which a connecting fitting such as a cap or a fixing fitting is attached as the insulator 6. Note that in this specification, the term "optical fiber" is used to include an optical fiber cable.

As shown in FIG. 5, the retaining portion of the optical fiber composite power line 1 stores the end of the composite power line 1 from one side in the aluminum sleeve 9 of the retaining clamp 2, and inserts the steel clamp 10 from the other side.
A protective pipe 11 located at the center of the composite power line 1 is exposed and extended from the end of the main power line 1&, and is housed in the hollow part 10ak of the steel clamp IO, and housed in the membrane-retaining pipe 11. The light 7 eyelid 7 is taken out to the outside through the hole 1 (l) drilled in the steel clamp IOK, and the aluminum sleeve 9 is compressed to remove the unevenness 1 on the outer surface of the steel clamp 10.
It has a structure that is firmly fixed to 0G.

In the optical fiber intake structure described above, the dielectric strength between the high-voltage charging part and the grounding part does not decrease due to the optical fiber 7 being taken into the steel tower 4. In other words, if we were to hypothetically say that the optical fiber 7 taken out from the retaining clamp 2 section was simply guided to the tower 4 side along the tensile insulator chain 3, high-voltage charging would occur because of the optical fiber 7. The leakage insulation distance between the section and the ground section is shortened. Also, after guiding the optical fiber 7 along the jumper I$3!5 to the vicinity of its center, it is also possible to introduce the fiber into the tower 4 side without using the above-mentioned insulator 6. Similarly, the leakage insulation distance is shortened, but according to the configuration of the embodiment of the present invention described above, the continuity in the length direction of the outer surface of the optical fiber 7 is interrupted by the insulator 6a in the through hole 6C. Therefore, the presence of the optical fiber 7 does not shorten the leakage insulation distance and does not cause a decrease in dielectric strength between the high-voltage charging section and the grounding section.

In addition, when attempting to introduce the optical fiber of an existing composite power line into the steel tower in order to carry new transmission information to the optical fiber transmission system, it is necessary to temporarily insert the optical fiber into the steel tower 4 by passing it through the tensile insulator chain 3. If it were to be incorporated, it would require complicated work such as replacing the tension-resistant insulator chain 3 that receives the tension of the composite power line 1, whereas in the case of the present invention, where the tension-resistant insulator is passed through the insulator, the insulator Replacement work is also relatively easy, which is particularly advantageous when constructing an existing one.

Note that the insulator 6 through which the optical fiber 7 is passed is not limited to a single insulator as in the embodiment, but may be a multiple insulator or may be V-shaped.

FIG. 6 shows a second embodiment of the present invention, in which the insulator 16 is installed horizontally on the side of the steel tower 4, and the other configuration is the second embodiment.
In the case shown in the figure, it is the same as ai#L'. Note that the insulators 16 may be two series insulators forming a V-shape in the horizontal plane.

FIG. 7 shows a third embodiment of the present invention, and this insulator 26 is a fixed type insulator whose bottom part is fixed to the arm 4a of the steel tower 4 and whose upper part supports the conductor/bar wire 5.

Note that the other configurations are almost the same as in the case of FIG. 2.

The insulators 6, 16, and 26 shown in FIGS. 2, 6, and 7 are used to prevent the jumper wire 5 from unnecessarily sagging or lateral deflection. A wire support method may also be adopted.

FIG. 8 shows a fourth embodiment of the present invention. This embodiment is applied to the case where the composite power line 1 is supported on the arm 4a of the steel tower 4, that is, in the case of a suspended steel tower, and is applied to the case where the composite power line 1 is supported on the arm 4a of the steel tower 4. A retaining clamp 3 having almost the same structure as the retaining clamp 2 of
0, the ends of the composite power line 1 are fixed, the left and right retaining clamps 30 are connected to both ends of the mechanical force sharing member 31, and the central hook portion 31 & of this mechanical force sharing member 31 is connected to the insulator 6 in FIG. The optical fibers are supported by insulators 36 having a similar structure, and the left and right retaining clamps 30 are connected with wires 32 to electrically connect the left and right composite power line main lines, and the optical fibers are pulled out from the left and right retaining clamps 30. Light 7.7 is passed through the insulator 36 as in the case of FIG. This is what was led to the IVA junction box 8.

Note that the mechanical force sharing member 31 is made of metal in order to obtain strength, and therefore the retaining clamp 30 and the mechanical force sharing member 31 are conductive parts.

In a normal suspended steel tower, the power line is simply supported upwards with a terminal end, and it is difficult to take out the optical fiber from such a suspended support, but as shown in Figure 8. In the structure shown, the composite power line has a terminal in spite of the suspension support part, so the optical fiber 7 can be taken into the tower 4 very easily, and in that case, the high-voltage live part and the ground can be connected very easily. The reduction in leakage insulation distance between parts does not cause a decrease in the dielectric strength of the sash.

In the embodiment, the optical fiber 7 is passed through a through hole 60 made in the center of the insulators 6, 16, 26, 36 and filled with an insulator 6d. Any method that does not shorten the distance may be used, for example,
It is also possible to spirally wind the optical 7 eyelid 7 tightly around the surfaces of the insulators 6, 16, 26, and 36 and guide it toward the steel tower 4 side.

〔Effect of the invention〕

As explained above, the present invention electrically connects composite power lines on both sides of a support structure such as a steel tower with a jumper wire, and connects an optical fiber separated from the main composite power line to a conductive part without being subjected to the tension of the composite power line. Since the optical fiber is guided to the support structure side through the supporting insulator, if many optical fibers are incorporated, leakage on the surface of the insulator between the high voltage live part and the ground part will occur, reducing the insulation distance. It is possible to maintain good dielectric strength between the ground side and the ground side.

In addition, since the Hikari 7-IPA is led to the ground side through an insulator that is not subjected to the tension of the composite power line, it is possible to easily install the optical fiber in the existing composite power line into the steel tower.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Fig. 1 is a side view of the vicinity of a transmission line tower, Fig. 2 is an enlarged view of the main part in fM1 drawing, and tixs drawing is an i-image line arrow view in Fig. 2. figure,
Fig. 4 is a half-sectional view of the insulator in Fig. 2, Fig. f45 is a sectional view of the retaining clamp in Fig. 2, Fig. 6 is a front view of the main part of the steel tower section showing the second embodiment, and Fig. 7 is FIG. 8 is a front view of the main part of the steel tower section showing the third embodiment, and FIG. 8 is a side view of the steel tower part manufacturing section showing the fourth embodiment. 1...Optical fiber composite power line, 1a...Composite power line main line, 2...Retaining clamp, 4...
... Steel tower (support structure), 4a... Arm, 5...
... Jumper wire (conductive part), 6, 16, 26.36
...Insulator, 7...Optical fiber, 8...
・Optical fiber junction box, 30...Retaining clamp,
31... Mechanical force sharing member (conductive part), 32...
...Jumper wire. Applicant Fujikura Electric Wire Co., Ltd. Figure 2

Claims (1)

[Claims] The optical fiber composite power lines (1) on each side of the support structure (4), which is insulated and supported by the support structure (4), are electrically connected to each other by jumper wires (5) and (32). an optical fiber bracket) which is connected to the optical fiber composite power line 0) and separated from the optical fiber composite power line main line (1a) near the connection part with the jumper m(5), (32) of the optical fiber composite power line 0),
Insulators (6L, (16),
An optical fiber intake structure in an optical fiber composite overhead power line, characterized in that the optical fiber is led to the support structure (4) side through (26) and (36).