JP4532028B2 - Jumper device for overhead power transmission line - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an overhead power transmission line jumper device using a rigid conductor such as a pipe conductor or a horizontal suspension member.
[0002]
[Prior art]
A schematic configuration of a conventional overhead power transmission line jumper device is shown in FIG. The overhead power transmission line jumper device is for electrically connecting the overhead power transmission line 18 secured to both sides of the tower arm 10 via the insulator series 12, the yoke 14, and the retaining clamp 16, respectively, and the rigid conductor 20 and It consists of a jumper wire 22 and a support bracket 24.
[0003]
The rigid conductor 20 is formed of a horizontal suspension member such as an aluminum pipe or an aluminum rod. Those using aluminum pipes are called pipe-type jumper devices, and those using horizontal suspension members are called suspension-type jumper devices. The rigid conductor 20 has a configuration in which two pipe conductors are arranged in parallel in the same horizontal plane. One end of the jumper wire 22 is electrically connected to the retention clamp 16 and the other end is electrically connected to the end of the pipe conductor 20. The support fitting 24 has one end connected to the yoke 14 and the other end connected to the pipe conductor 20.
In FIG. 3, reference numeral 26 denotes an arcing horn attached to both ends of the insulator series 12, and 28 denotes a jumper spacer for keeping the distance between the jumper wires 22.
[0004]
By the way, it is known that galloping vibration occurs in the overhead power transmission line. This galloping vibration is a low-frequency large-amplitude vibration, and is likely to occur mainly in an aerial transmission line installed in a mountainous area. When galloping vibration occurs in the overhead power transmission line, the jumper device also vibrates in conjunction with it. That is, when galloping vibrations occur, the jumper device has vibrations in which the pipe conductor 20 swings in the line direction as shown in FIG. 4, vibrations in which the pipe conductor 20 swings in the direction perpendicular to the line direction, and FIG. The serpentine vibration etc. which the pipe conductor 20 rotates in a horizontal surface as shown in FIG.
[0005]
When the natural frequency of vibration generated in these jumper devices and the frequency of galloping vibration match, resonance occurs in the jumper device, and wire breakage occurs in the jumper wire 22 near the mouth of the retention clamp 16. There is.
[0006]
In order to prevent the resonance of the jumper device, the natural vibration period of the vibration generated in the jumper device may be configured not to match the vibration period of the galloping vibration. Japanese Patent Application Laid-Open No. 64-1413 describes such a jumper device. This jumper device is obtained by calculating the line direction vibration cycle of the jumper device from the estimation formula, and adjusting the length and inclination angle of the suspension material so that the value does not coincide with the vibration cycle such as the basic loop vibration of galloping vibration. is there.
[0007]
[Problems to be solved by the invention]
As described above, the resonance of the jumper device can be prevented by configuring the natural vibration period of the vibration generated in the jumper device and the vibration period of the galloping vibration to be inconsistent. The jumper device described in the publication adjusts the length and inclination of the suspension so that the value obtained from the estimation calculation formula does not coincide with the vibration cycle of the basic loop of galloping vibration, etc. In the configuration, there is a problem that the vibration period of the galloping vibration that makes a complicated movement may coincide with the natural vibration period of the jumper device.
[0008]
[Means for Solving the Problems]
The present invention provides a jumper device for an overhead power transmission line that solves the above-described problems. The configuration is such that both ends of a rigid conductor are connected to a yoke at the tip of an insulator series, and the other end is connected. In the overhead power transmission line jumper device supported by a support metal fitting connected to a rigid conductor, a composite insulator formed by forming both ends of the rigid conductor and a steel tower arm on the outer periphery of the FRP rod with a plurality of shades made of elastomer. The connecting portion between the composite insulator and the rigid conductor and the connecting portion between the composite insulator and the steel tower arm are fixed connecting portions having no movable parts.
With this configuration, since the rigid conductor is prevented from freely moving, the jumper device does not resonate due to galloping vibration.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment of the present invention. In FIG. 1, the same parts as those shown in FIG. A feature of this jumper device is that both ends of the rigid conductor 20 and the tower arm 10 are connected by the composite insulator 30. The composite insulator 30 has an FRP (fiber reinforced plastic) rod as a core material and is formed with multistage shades with an elastomer such as silicone rubber on the outer periphery, and has an advantage that it is extremely light compared to a porcelain insulator.
[0010]
The connecting portion 32 between the composite insulator 30 and the rigid conductor 20 and the connecting portion 34 between the composite insulator 30 and the steel tower arm 10 are respectively flange-connected to form a fixed connecting portion having no movable portion. With such a connection structure, free movement of the rigid conductor 20 can be prevented. Therefore, even if galloping vibration occurs between the diameters, the jumper device does not vibrate following the vibration, and therefore the jumper device does not resonate with the galloping vibration. The configuration other than the above is the same as that of the conventional jumper device shown in FIG.
[0011]
FIG. 2 is a graph showing the results of a simulation calculation of how much the tip of the rigid conductor 20 swings in the direction perpendicular to the line when the tip of the insulator series 12 is forcibly excited at a certain vibration frequency in the configuration of FIG. It is a thing. A is a conventional configuration without a composite insulator, and B is a configuration of the present invention incorporating a composite insulator. In the configuration of the present invention, the amplitude in the direction perpendicular to the line is clearly reduced. Therefore, it can be seen that it is difficult to resonate with the vibration period of the galloping vibration.
[0012]
In the present invention, the connecting portion 32 between the composite insulator 30 and the rigid conductor 20 and the connecting portion 34 between the composite insulator 30 and the steel tower arm 10 may be connected in a state where there is no movable portion, and the connecting means is particularly It is not limited. Further, the structure of the composite insulator is not particularly limited as long as the structure is such that the steel tower arm 10 and the rigid conductor 20 are electrically insulated so that the rigid conductor 20 can be prevented from freely moving.
[0013]
【The invention's effect】
As described above, in the present invention, both ends of the rigid conductor and the steel tower are connected with the composite insulator, respectively, and the connecting portion between the composite insulator and the rigid conductor and the connecting portion between the composite insulator and the steel tower are fixed without moving parts, respectively. Since the connecting portion is used, free movement of the rigid conductor can be prevented. For this reason, the jumper device does not resonate with the galloping vibration between the spans, and it is possible to prevent the wire breakage or the like in the jumper wire near the mouth of the retaining clamp.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a jumper device according to the present invention.
FIG. 2 is a graph showing a simulation result of vibrations of the jumper device of FIG. 1 and a conventional jumper device.
FIG. 3 is a front view showing a conventional jumper device.
FIG. 4 is an explanatory diagram showing how a rigid conductor swings in the line direction in a conventional jumper device.
FIG. 5 is an explanatory view showing how the rigid conductor swings in the direction perpendicular to the line.
FIG. 6 is an explanatory view showing how the rigid conductor swings in the horizontal plane.
[Explanation of symbols]
10: Steel tower arm
12: Choshiren
14: York
16: Retention clamp
18: Overhead power transmission line
20: Rigid conductor
22: Jumper wire
24: Support bracket
30: Composite eggplant
32: Connection between composite insulator and rigid conductor
34: Connection between the compound insulator and steel tower arm

Claims (1)

Both ends of the rigid conductor (20) are supported by a support fitting (24) having one end connected to the yoke (14) at the tip of the insulator series (12) and the other end connected to the rigid conductor (20). In the overhead power transmission line jumper device, both ends of the rigid conductor (20) and the tower arm (10) are connected to the outer periphery of the FRP rod by a composite insulator (30) formed of multi-stage shades with elastomer . The connection part (32) between the composite insulator (30) and the rigid conductor (20) and the connection part (34) between the composite insulator (30) and the tower arm (10) are fixed connection parts without moving parts. A jumper device for overhead power transmission lines.

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