JPH08289444A - Jumper wire supporting structure - Google Patents

Abstract

PURPOSE: To lower the height of steel tower by decreasing the vertical interval of jumper wire in a strain tower. CONSTITUTION: An arm 12 in a strain tower 11 is projected farther outside than the tip of an arm 12 directly thereunder. A rigid insulator 16 is fixed to the tip of the arm 12. The rigid insulator 16 supports the intermediate part of an arcuate suspension jumper wire 15 while keeping a ground insulation interval (a) with respect to the arm 12 directly thereunder. With such structure, vertical interval of the jumper wire 15 is decreased and the height of the steel tower 11 can be lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jumper wire support structure for an overhead power transmission line.

[0002]

2. Description of the Related Art In a tension tower section of an overhead power transmission line, a conventional jumper wire support structure for electrically connecting main lines on both sides of a tower, which is held by an arm, has a structure shown in FIGS. It has been known. That is, the middle portion of the flexible arc-shaped hanging jumper wire 5 electrically connecting the transmission line main line 4 on both sides of the steel tower, which is held to the arm 2 of the steel tower body 1 through the tension insulator string 3, is connected to the arm. It has a structure in which it is supported by a rigid insulator 6 attached to 2, and the upper and lower insulators 6 are arranged so as to be vertically aligned with the tips of the arms 2 having the same protruding length. In FIG. 4, the insulation distance between the jumper wires 5 and the ground is indicated by a and the leak distance between the ground and h is indicated by h ₀ .

[0003]

In the conventional jumper wire support structure described above, since the middle portion of the arcuate hanging jumper wire 5 is fixed to the lower end of the rigid insulator 6, the jumper wire 5 rolls due to wind pressure. Therefore, the separation distance (jump length of the arm 2) 1 of the jumper wire 5 from the steel tower body 1 can be reduced, but the height of the steel tower cannot be kept low.

The present invention has been made in view of the above-mentioned conventional points, and an object of the present invention is to provide a jumper wire support structure capable of suppressing the height of a steel tower lower than in the conventional case.

[0005]

In the jumper wire support structure of the present invention for solving the above-mentioned problems, the protruding length of the arm of the tension tower is made longer than the protruding length of the arm immediately below the arm, and the arm is provided near the tip of the arm. The intermediate part of the arcuate hanging jumper wire that suspends the rigid insulator and electrically connects the transmission line main lines on both sides of the tension tower is grounded between the arcuate hanging jumper wire and the arm immediately below. It is characterized in that it is supported by the rigid insulator so that the inter-insulation interval is maintained.

[0006]

In the above structure, each insulator of the upper and lower arms has a rigid body shape to prevent the swaying due to the wind pressure of the jumper wire, and each insulator projects further outward than the tip of the arm directly below it. By suspending at the tip of the arm, the vertical distance between the upper and lower arms can be reduced while maintaining the necessary ground-to-ground insulation distance (air insulation distance) for the arm directly below the upper and lower jumper wires. Therefore, the height of the tower can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view showing a jumper wire support structure of one embodiment of the present invention applied to a three-phase vertical array transmission line, and FIG. 2 is a side view of the same. The transmission line main lines 14 on both sides of the steel tower are retained by the upper and lower three-stage arms 12 provided on the tension-resistant steel tower 11 via tension-resistant insulator chains 13, respectively.
Is an arcuate hanging jumper wire 15 consisting of a flexible stranded wire
Are electrically connected via. The main line holding position P of each arm 12 is the same.

The lowermost arm 12 has a protruding length up to the main line holding position P, but the middle arm 12 projects outward by a distance s ₁ from the main line holding position P, and the uppermost arm 12 has the middle position. It projects further outward than the arm 12 by a distance s ₂ . At the tip of each arm 12, a rigid insulator 16 such as a long insulator or a station post, which is a kind of rod insulator in which caps as connecting fittings are cemented at both ends of a porcelain rod, is attached. The lower end supports the intermediate portion of the arcuate hanging jumper wire 15. The protrusion lengths s ₁ and s ₂ from the tip of the arm 12 directly below the uppermost arm 12 and the middle arm 12, respectively, are both arc-shaped depending jumper wires 15 supported by the rigid insulator 16 of the arm 12 and Insulation distance to the ground with the arm 12 directly below (air insulation distance)
The length is set so that a is held. In the illustrated example, the curve of the arcuate hanging jumper wire 15 (curve of the arcuate hanging jumper wire 15 shown in FIG. 1) when viewed from the front is the insulation distance a from the tip of the arm 12 immediately below the ground a. It is out of range.

In the above structure, the upper and lower arms 12 are provided.
Each insulator 16 is rigid and has an arcuate hanging jumper wire 1
5 Rolling due to wind pressure is prevented, and each rigid body
The insulator 16 is even more than the tip of the arm 12 directly below it.
Being suspended at the tip of the arm 12 protruding outward
As shown in Fig. 1, the top and middle arc-shaped droops
The suspension point Q of the rigid jumper 16 of the jumper wire 15 is poled.
Can be reduced, and therefore the top and middle
Each arcuate hanging jumper wire 15 is attached to the arm 12 directly below.
While maintaining the necessary insulation distance a from the ground,
It is possible to reduce the vertical interval of the jumper lines 15. sand
That is, the insulation distance a from the ground in the conventional example (see Fig. 3)
Between the arcuate hanging jumper wire 5 and the arm 2 directly below it.
However, in the present invention, the vertical spacing between
Vertical distance between the jumper wire 15 and the arm 12 directly below it
Every h₁ , H₂ Is obviously smaller than the ground insulation distance a
Will be Therefore, a diagram comparing the present invention with the conventional example
3, the leakage interval to ground is h ₀ Then,
The uppermost arm 2 of the tension-resistant steel tower with the jumper wire support structure
Height H from the ground₁ , And the jumper wire support structure of the present invention
The height of the uppermost arm 12 of the tension tower from the ground
Sa H₂ Is H₁ = 3a + 3h₀ H₂ = A + h₁ + H₂ + 3h₀ But h₁ <A, and h₂ <Because it is a, H₂ 
<H₁ Becomes That is, according to the present invention, the tower height
It can be lower than ever.

In the illustrated example, as described above, the curve of the arcuate hanging jumper wire 15 when viewed from the front is out of the range of the ground-to-ground insulation distance a from the tip of the arm 12 immediately below it. From the perspective, the arcuate hanging jumper wire 1
The part distant from the middle part of 5 to the main line holding position P side is
Since there is a distance in the longitudinal direction of the jumper wire with respect to the arm 12, even if it is within the range of the insulation distance a to the ground as seen from the front view, the arcuate hanging jumper wire 15 is spatially in the range of the insulation distance a to the ground. It is possible to be outside and thus in practice the vertical spacing can be even smaller than in the case shown in FIG.

In the embodiment, the arc-shaped hanging type jumper wire 15 is used.
Although the intermediate portion of 1 is supported by the rigid insulator, it is also conceivable that, for example, 2 portions are supported by two rigid insulators. Moreover, although the embodiment is applied to a three-phase vertical array transmission line, the present invention is not necessarily limited to this.

[0012]

According to the present invention, each insulator of the upper and lower arms has a rigid body shape, and each rigid body insulator is suspended at the tip of the arm projecting further outward than the tip of the arm directly below it. Since it is suspended, it is possible to reduce the vertical interval of the arcuate drooping jumper wires while maintaining the necessary ground-to-ground insulation space for the arms directly below the upper and lower arcuate drooping jumper wires. In other words, the tower height can be made lower than before.

[Brief description of drawings]

FIG. 1 is a front view showing a jumper wire support structure of an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a comparison diagram of the height of a tension-resistant steel tower adopting the jumper wire support structure of the present invention and the height of a tension-resistant steel tower adopting a conventional jumper wire support structure.

FIG. 4 is a front view showing an example of a conventional jumper wire support structure.

FIG. 5 is a side view of the main part of FIG.

[Explanation of symbols]

 11 Stranding Steel Tower 12 Arm 13 Stranding Insulator Reinforcement 14 Transmission Line Main Line 15 Arc Pendant Jumper Line 16 Rigid Insulator a Ground Insulation Interval (Air Insulation Interval)

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[Procedure amendment]

[Submission date] August 4, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Added

[Correction content]

[Figure 5]

Claims (1)

[Claims] 1. The extension length of the arm of the tension tower is made longer than the protrusion length of the arm immediately below, and a rigid insulator is suspended near the tip of the arm so that the transmission line main lines on both sides of the tension tower are mutually connected. The middle part of the arcuate hanging jumper wire that is electrically connected to
A jumper wire support structure, wherein the rigid insulators are supported so that an insulation distance to ground is maintained between the arc-shaped hanging jumper wire and an arm directly below the jumper wire.