JPH08126140A - Anchoring method for self-supporting optical cable - Google Patents

Abstract

PURPOSE: To prevent the entire surface of a salt damageless insulator from being contaminated by anchoring a self-supporting optical cable, being strung under a transmission line substantially in parallel therewith, to a steel tower through the insulator arranged in the longitudinal direction. CONSTITUTION: A metal clamp 4 is fixed to the anchoring part of a self-supporting cable 3 strung under a transmission line substantially in parallel therewith. The metal clamp 4 is anchored to a steel tower 2 through a coupling metal 5, a salt damage less insulator 6 and a T-shaped member 7. The insulators 6 are coupled, at the tips thereof, through a link 8 which spreads the anti-pollution insulators 6 in the longitudinal direction. This structure prevents the entire surface of the insulator 6 from being contaminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of retracting a self-supporting optical cable which is installed below a power transmission line and substantially parallel to the power transmission line.

[0002]

2. Description of the Related Art As shown in FIG. 3, a power transmission line 1 is installed between steel towers 2, and a self-supporting optical cable 3 may be installed below the power transmission line 1 substantially parallel to the power transmission line 1. is there. The self-supporting optical cable 3 is fastened to the steel tower 2 via a metal clamp 4.

[0003]

As described above, the self-supporting optical cable, which is installed below the power transmission line and substantially parallel to the power transmission line, is placed in a strong electric field. The self-supporting optical cable placed in the position had a problem that the surface was carbonized, so-called tracking occurred. In other words, if the surface of a self-supporting optical cable placed in a strong electric field becomes electrically conductive due to long-term deposition of atmospheric pollutants, or especially salty rain, fog, etc. A ground current flows on the surface of the self-supporting optical cable due to electrostatic coupling with the optical cable. When the surface of the self-supporting optical cable is dried by the heat generated by this current, the current path is cut off, and a dry band arc is generated at this portion. Due to the high heat generated by this arc, the surface of the self-supporting optical cable is carbonized, and so-called tracking occurs. Such carbonization on the surface of the self-supporting optical cable causes deterioration of the insulating property of the self-supporting optical cable, and in some cases, there is a problem that the self-supporting optical cable is burned out.

As a method of preventing such tracking, there is used a method of using a material having excellent tracking resistance as an insulating material of the self-supporting optical cable, or a method of using a metal clamp and a steel tower holding the self-supporting optical cable. It is conceivable to interpose a porcelain insulator between them to interrupt the passage of the current flowing on the surface of the self-supporting optical cable.

However, in the method of using a material having excellent tracking resistance as an insulating material for a self-supporting optical cable, a material having excellent tracking resistance is expensive, and even a material having excellent tracking resistance can be used for tracking. There is a problem that it cannot be prevented sufficiently.

[0006] In addition, an insulator is interposed between the metal clamp holding the self-supporting optical cable and the steel tower,
The method of interrupting the passage of the current flowing on the surface of the self-supporting optical cable can be expected to have the effect of interrupting the current at all times, but when the anchor is polluted or when it gets wet, the current flows on the surface of the insulator and There is a problem that the ground current flowing on the surface of the support type optical cable cannot be sufficiently interrupted. It is considered that this is because the detention insulator is arranged substantially horizontally, so that the entire surface of the desorption insulator is easily soiled or easily wetted, and a ground current flows on the surface of the insulator.

[0007]

SUMMARY OF THE INVENTION The present invention provides a method for retracting a self-supporting optical cable that solves the above-mentioned problems, in which a self-supporting optical cable is installed below a power transmission line and extends substantially parallel to the power transmission line. It is characterized in that it is retained on a steel tower using a salt-resistant insulator, and the salt-resistant insulator is arranged in the longitudinal direction.

[0008]

[Function] By holding the self-supporting optical cable on the steel tower using the salt-corrosion-resistant insulator and arranging the salt-corrosion-resistant insulator in the longitudinal direction, the entire surface of the salt-corrosion-resistant insulator is damaged. Can be prevented. That is, as is well known, the salt-corrosion-resistant insulator is formed with deep pleats, and since the salt-corrosion-resistant insulator is arranged in the longitudinal direction, the entire surface of the salt-corrosion-resistant insulator is not polluted. Therefore, the ground current does not flow on the surface of the salt-proof insulator, and eventually the current can be prevented from flowing on the surface of the self-supporting optical cable, so that tracking can be effectively prevented.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of a method of retracting a self-supporting optical cable according to the present invention. In this example, the present invention is applied to a tension resistant tower. Metal clamps 4 and 4 are attached to the retracting portion of the self-supporting optical cable 3, and the metal clamps 4 and 4 are coupling tools 5,
5, the salt-resistant insulators 6, 6 and the T-shaped member 7 are used to hold the steel tower 2. Reference numeral 8 is a link that connects the tip ends of the salt-corrosion-resistant insulators 6, 6 and is used to orient the salt-corrosion-resistant insulators 6, 6 in the vertical direction. By this link 8, the salt-damage-resistant insulators 6, 6 are arranged in a V shape in a vertical direction.

According to the above-mentioned detention method, since the inner surface of the deep folds of the salt-corrosion-resistant insulator is unlikely to be soiled, the ground current does not flow through the surface of the salt-corrosion-resistant insulator to the steel tower. Therefore, current can be prevented from flowing on the surface of the self-supporting optical cable, and thus tracking can be effectively prevented.

FIG. 2 is a front view showing another embodiment of the method of retracting the self-supporting optical cable according to the present invention. The point different from the above-mentioned embodiment is that the salt damage insulators 6, 6 are hung from two positions of the steel tower 2 and arranged in a V shape. Figure 2
In FIG. 1, the same parts as those in FIG. Thus, even if the salt-proof insulators 6 are hung from two locations on the steel tower 2 and arranged in a V shape, the entire surface of the salt-proof insulator is not polluted. Since current does not flow to the tower and current can be prevented from flowing on the surface of the self-supporting optical cable, tracking can be effectively prevented.

In the examples, the case where the present invention is applied to the tension resistant tower is shown, but the present invention can be similarly applied to the drawn steel tower. In addition, the angle when arranging the salt damage insulator in the vertical direction is not particularly limited,
The angle should be such that the inner surface of the deep folds of the salt-resistant insulator is not exposed to rainwater.

[0013]

Industrial Applicability As described above, the self-supporting optical cable anchoring method according to the present invention is such that the self-supporting optical cable is retained on a steel tower by using a salt-corrosion-resistant insulator, and the salt-corrosion-resistant insulator is longitudinally oriented. It is possible to prevent the entire surface of the salt-corrosion-resistant insulator from being soiled or the like because it is disposed toward the. Therefore, no electric current flows on the surface of the salt-damage insulator,
Since current can be prevented from flowing on the surface of the self-supporting optical cable, tracking can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a method of retracting a self-supporting optical cable of the present invention.

FIG. 2 is a front view showing another embodiment of the present invention.

FIG. 3 is an explanatory diagram of a erected state of the self-supporting optical cable.

[Explanation of symbols]

 1 Transmission line 2 Tower 3 Self-supporting optical cable 4 Metal clamp 5 Connector 6 Salt-proof insulator 7 T-shaped member 8 Link

Claims (1)

[Claims] 1. A self-supporting optical cable, which is hung substantially parallel to the transmission line at the bottom of the transmission line, is retained on a tower using a salt-corrosion-proof insulator, and the salt-corrosion-proof insulator is oriented vertically. A method for retracting a self-supporting optical cable, characterized in that