JPH06203672A - Insulator arm of power transmission line steel tower - Google Patents

Abstract

PURPOSE:To prevent an insulator or a connecting part from being damaged due to friction, etc., by making the rotary center axial line of a part which connects the base terminal of compressing insulator with a steel tower main body conformable with a rotary center axial line of a part which connects the base terminal of an expanding insulator with the steel tower main body. CONSTITUTION:A compression insulator 3 and an extension insulator 4 are connected at their tip parts and the base terminal of the compression insulator 3 and the base terminal of the extension insulator 4 are connected respectively with a steel tower main body 1 and thus insulator arm 2 is formed. The connecting pin 15 to connect a terminal metal fitting 14 of the compression insulator 3 with an insulator supporting metal fitting 21 in the steel tower main body 1 side and the connecting pin 17 to connect a terminal metal fitting 16 of the extension insulator 14 with an insulator supporting metal fitting in the steel tower main body 1 side are set in the same center axial line. As a result, the insulator arm 2 can rotate smoothly on the connecting pins 15, 17 and the insulator arm 2 is free from excessive force and the insulators 3, 4 and the connecting parts 5, 7 are not affected by unnecessary force and thus damage due to such as friction, etc., is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator arm of a transmission line tower.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a transmission line tower in which an arm is composed of an insulator. Reference numeral 1 is a tower main body, and 2 is an insulator arm composed of a compression insulator 3 and a tension insulator 4. The compression insulator 3 and the tension insulator 4 are connected at their tips, the compression insulator 3 is arranged substantially horizontally, and the tension insulator 4 is arranged obliquely on the compression insulator 3. The base end of the compression insulator 3 and the base end of the tension insulator 4 are connected to the tower main body 1.

FIG. 5 shows a more specific structure of the insulator arm 2. The tips of the compression insulator 3 and the tension insulator 2 are connected by a connecting pin 11, and a suspension clamp 13 that supports the power transmission line 12 is suspended from the connecting pin 11. The proximal end of the compression insulator 3 is rotatably connected to the tower main body 1 by means of an insulator terminal fitting 14 and a connecting pin 15. On the other hand, the base end of the tensile insulator 4 is
6, the connecting pin 17, the connecting fitting 18, the connecting pin 19, the clevis 20, etc. are connected to the steel tower main body 1.

[0004]

In the insulator arm, the tip end portion can be moved in the line direction to some extent by the rotation of the base end portion so as to absorb the difference in the wire tension between the adjacent diameters. However, in the conventional insulator arm, the direction of the connecting pin, which is the center of rotation of the compression insulator, and the direction of the connecting pin, which is the center of rotation of the tension insulator, are different. Occurs, abrasion of the connecting member and twisting of the insulator shaft occur,
May cause damage to the peeler arm in the long term.

If the tip of the insulator arm is strongly pulled in the track direction due to a disconnection accident or the like, an extremely large bending moment is applied to the insulator arm, which may damage the insulator or the connecting member. Especially in the case of a wire breakage accident, if the insulator arm is destroyed in one tower, the insulator arm is also destroyed in the adjacent steel tower.
Since there is a risk of so-called cascade destruction, in which the destruction expands in a chained manner, it is necessary to take measures against this also in the insulator arm.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a structure in which a compression insulator and a tension insulator are connected at the tip, and the base end of the compression insulator and the tension insulator are connected to each other. In the insulator arm of the transmission line tower, which connects the base ends of the insulators to the tower body, connects the rotation center axis of the part connecting the base end of the compression insulator to the tower body and the base end of the tension insulator to the tower body. It is characterized in that the central axes of rotation of the parts are matched.

Further, it is preferable to provide a stopper for restricting the rotatable range of the compression insulator to be smaller than the rotatable range of the tension insulator at a portion where the base end of the compression insulator is connected to the tower main body.

[0008]

According to the above construction, when the tip of the insulator arm is pulled in the line direction due to the change in the tension of the power transmission line, the insulator arm rotates smoothly. It is possible to prevent damage due to abrasion or the like.

If a stopper for restricting the rotatable range of the compression insulator is provided, the compression insulator will be damaged first when a strong bending moment is applied to the insulator due to a wire breakage accident or the like. As a result, the power transmission line can be hung with only one pulling wheel. Therefore, the movable range of the tension insulator further expands, and the tension insulator mainly receives the tension to avoid damage, so that it is possible to prevent chain damage.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 show an embodiment of the present invention. In FIG. 1, the same parts as those in FIG. 5 described above are designated by the same reference numerals. This insulator arm 2 is characterized by a connecting pin 15 for connecting the insulator terminal fitting 14 of the compression insulator 3 to the insulator support fitting 21 on the tower main body 1 side, and the tensile insulator 4.
That is, the connecting pin 17 for connecting the insulator terminal fitting 16 to the insulator support fitting 22 on the tower main body 1 side is arranged on the same axis. As a result, the insulator arm 2 has the connecting pin 1
Since it becomes possible to rotate smoothly around 5 and 17, it is not unreasonable even if it is pulled in the line direction due to the change in tension of the power transmission line 12.

Another feature of this insulator arm 2 is that
As shown in FIG. 2, the insulator support fitting 2 on the compression insulator 3 side
1 is that a stopper 23 that restricts the rotatable range of the compression insulator 3 is formed. As a result, the rotatable range of the compression insulator 3 is restricted to be smaller than the rotatable range of the tension insulator 4. As a result, when a particularly strong tensile force in the line direction is applied due to a disconnection accident or the like, when the compression insulator 3 reaches the limit of the rotatable range, it receives a large bending moment and breaks first. Therefore, the tensile insulator 4
Since the degree of freedom of the tensile insulator 4 is further expanded and only the tensile force acts mainly on the tensile insulator 4, only the tensile insulator 4 is escaped from destruction, and the risk of cascade destruction can be reduced.

In order to ensure that only the compression insulator 3 is destroyed when the compression insulator 3 reaches the limit of the rotatable range, the compression insulator 3 is to be destroyed when an excessive bending moment exceeds the bending strength of the compression insulator 3. The base end of 3 (insulator rod or insulator end fitting) may be designed to have a structure in which it first bends and breaks.

As the compression insulator 3 and the tension insulator 4, a polymer insulator having a FRP rod coated with a polymer or a porcelain long-structure insulator can be used. From the viewpoint of non-scattering property when destroyed, it is preferable to use a polymer insulator.

In the above embodiment, the connecting portions of the compression insulator 3 and the tension insulator 4 on the base end side are connected to the insulator terminal fitting 1
Although 4 and 16 are made of eyes and the insulator support metal fittings 21 and 22 are made of clevis, either one may be a clevis or an eye. Further, the connecting portion on the base end side of the tension insulator 4 may be formed by tying the U clevis 24 and the U clevis 25 as shown in FIG.

[0015]

As described above, according to the present invention, when the distal end portion of the insulator arm is pulled in the line direction due to the change in the tension of the power transmission line, the insulator arm rotates smoothly. It is possible to prevent damage due to abrasion or the like of the insulator or the connecting member, and long-term reliability is improved.

If a stopper for restricting the rotatable range of the compression insulator is provided, when the wire breakage accident occurs, the compression insulator is restricted in rotation by the stopper and is destroyed first, so that the movable range of the tension insulator is reduced. The spread and tension insulators are mainly in a state where they are only subjected to tension and escape from damage, so that chain-like damage can be prevented.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an insulator arm according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing another example of the connection structure on the proximal end side of the tension insulator in the insulator arm of the present invention.

FIG. 4 is a front view showing an example of a power transmission line tower having an insulator arm.

FIG. 5 is a front view showing a conventional insulator arm.

[Explanation of symbols]

 1: Steel tower main body 2: Insulator arm 3: Compression insulator 4: Tensile insulator 11: Connecting pin 12: Transmission line 13: Suspended clamp 14: Insulator terminal fitting 15: Connecting pin 16: Insulator terminal fitting 17: Connecting pin 18: Connecting fitting 21, 22: Insulator support bracket 23: Stopper

Claims (2)

[Claims] 1. A compression insulator and a tension insulator are connected at their tips,
In the insulator arm of the transmission line tower that connects the base end of the compression insulator and the base end of the tension insulator to the steel tower body,
An insulator arm for a transmission line tower, characterized in that the rotation center axis of the part connecting the base end of the compression insulator to the tower body and the rotation center axis of the part connecting the base end of the tension insulator to the tower body are aligned. 2. The insulator arm according to claim 1, wherein a stopper that restricts a rotatable range of the compression insulator to a smaller range than a rotatable range of the tension insulator is provided at a portion where a base end of the compression insulator is connected to a tower main body. Characterized by that.