JP2002165344A - Wire-tension regulating device for controlling wire relaxation and for preventing excessive tension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the insufficiency of a ground height by controlling a wire relaxation to increase associated with a trend of a capacity of a transmission line in operation to increase, and also to prevent a wire tension to become excessive due to snow accretion and the like. SOLUTION: There is installed a wire-tension regulating device that hydraulically pushes a piton to raise a wire when the wire tension is decreased, and draws back the piston to reduce the tension when the wire tension becomes excessive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire tension adjusting device which suppresses an increase in sag when a wire tension of a transmission line is lowered and reduces the tension in the case of over tension.

[0002]

2. Description of the Related Art In order to increase the capacity of an existing transmission line, increasing the current increases the temperature of the wire, increases the elongation of the wire, reduces the wire tension, and increases the sag. Therefore, there may be a place where the ground height of the electric wire is insufficient. A practical method for suppressing the sag of the electric wire has not been developed yet, and it is necessary to raise the electric wire support point by raising the tower. Also, if the wire tension becomes excessive due to snowfall, etc.,
The tower may be damaged or collapsed, and the strength of the tower is increased.

[0003]

When the tension of the electric wire is lowered, the electric wire is pulled up to eliminate the shortage of the electric wire above the ground, and it is possible to increase the capacity of the existing transmission line without performing a large-scale tower remodeling work. When the wire tension becomes excessive due to snow accretion, the wire is inserted to reduce the tension and reduce the load applied to the tower.

[0004]

SUMMARY OF THE INVENTION According to the present invention, when the tension of an electric wire is reduced, the electric wire is pulled up by operating a piston by hydraulic pressure to eliminate a shortage of the ground, and the tension is reduced by pulling back the piston for over tension. Is what you do. Since the part inserted in series with the electric wire is required to be small and lightweight, the hydraulic tank is installed on a steel tower, and hydraulic pressure is supplied to the cylinder of the wire tension adjuster installed in series with the electric wire through a hydraulic hose. (See FIG. 2).

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION When used for suppressing sag, set the hydraulic pressure according to the minimum working tension. When using it for preventing excessive tension, set it according to the maximum working tension. The hydraulic pressure is supplied from a hydraulic tank on a steel tower through a hydraulic hose.

In the case of sagging suppression, the piston is pulled all the way to the wire side in the cylinder when the tension is equal to or higher than the minimum working tension. When the wire tension falls below the minimum working tension, the piston is pushed by hydraulic pressure and the wire is pulled up. In this way, the wire tension is prevented from falling below the minimum working tension and the increase in the sag is suppressed.

In the case of over-tension prevention, the piston is pressed against the steel tower side in the cylinder with a hydraulic pressure corresponding to the maximum working tension, and when the wire tension exceeds the maximum working tension, the piston is pulled back to reduce the tension.

[0008]

An embodiment will be described with reference to the drawings. In FIG. 3, in the case of sagging suppression, when the wire tension decreases, oil 11 is supplied from the hydraulic tank through the hydraulic hose 4 into the cylinder 7, and the piston 9 is pushed to pull up the wire. In the case of over-tension prevention, when the wire tension is higher than the hydraulic pressure supporting the piston 9, the piston 9 is pulled back to insert the wire, and the wire tension is reduced.

In the embodiment shown in FIGS. 4 to 6, in the case of sagging suppression, FIG. 4 shows a state in which the tension is equal to or higher than the minimum operating tension, and the wire tension from the wire side mounting ring 19 is applied to the piston via the slide bar 17. 15 is attracted to the electric wire side. When the wire tension decreases, as shown in FIG. 5, the piston 15 is pushed by the hydraulic pressure and moves to the steel tower side to pull up the wire.

In the case of over-tension prevention, the piston 15 is pressed against the steel tower by hydraulic pressure, and when the wire tension increases, the piston 15 is pulled back to the wire side against the oil pressure to reduce the tension.

FIG. 6 is a sectional view taken along line AA of FIG.
A groove 21 is provided on the outside of the cylinder 4 and the slide bar 17 is disposed in the groove to prevent the cylinder 14 and the slide bar 17 from rotating.

FIG. 7 shows an example of a pressure tank. (A) uses a pressurized film, (b) uses a spring, and (c) uses an object whose volume fluctuates due to pressure. This is to be stored.

[0013]

The present invention is embodied in the form described above, and has the following effects.

Since the electric wire can be pulled up when the electric wire has a low tension and the sag can be prevented from increasing, the capacity of the existing transmission line can be increased without increasing the height of the tower.

Since the over tension of the electric wire can be prevented, the design conditions of the tower against abnormal weather can be reduced, and the tower can be made economical.

[Brief description of the drawings]

FIG. 1 is a diagram showing electric wire sag.

FIG. 2 is a plan view showing an example in which a wire tension adjusting device is installed.

FIG. 3 is a longitudinal sectional view of an electric wire tension adjusting tool having a piston rod on the electric wire side.

FIG. 4 is a vertical cross-sectional view showing a state in which the position of the piston of the wire tension adjuster in which the piston rod is on the steel tower side is on the wire side.

FIG. 5 is a vertical cross-sectional view showing when the position of the piston of the wire tension adjuster with the piston rod on the tower is on the tower side.

FIG. 6 is a sectional view taken along line AA of the wire tension adjuster in which the piston rod is on the steel tower side.

FIG. 7 is a diagram illustrating an example of a hydraulic mechanism of a hydraulic tank.

[Explanation of symbols]

 d Sagging degree 1 Electric wire 2 Iron tower 3 Hydraulic tank 4 Hydraulic hose 5 Electric wire tension adjuster 6 Insulator series 7,14 Cylinder 8 Air hole 9,15 Piston 10,16 Piston rod 11 Oil 12,19 Electric wire side mounting ring 13,20 Iron tower Side mounting ring 17 Slide bar 18 Tension bar 21 Groove 22 Pressure film 23 Spring 24 Object whose volume fluctuates due to pressure

Claims (2)

[Claims] 1. When the wire tension of a transmission line decreases, hydraulic pressure supplied from a hydraulic tank installed on a steel tower pushes a piston to pull up the wire, thereby sagging the wire (slack of wire, see FIG. 1). A wire tension adjusting device in which a piston rod is located on the wire side, and the piston is pulled back to reduce the wire tension due to over tension of the wire. 2. The piston rod is located on the side of the tower.
Wire tension adjusting device.