JPH038023Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a jumper device for an overhead power transmission line that has improved corona discharge characteristics.

"Prior art and its problems" In ultra-high-voltage power transmission lines, a single-phase wire is divided into multiple elementary conductors from the viewpoint of electrical characteristics such as corona discharge characteristics, and a jumper device installed on the tower of the power transmission line is used. Therefore, the main lines on both sides of the tower are electrically connected to each other. A conventional example of this jumper device will be explained with reference to FIGS. 3 to 5. A rigid rod body 5 is attached to a metal fitting 4 between a tension insulator chain 2 connected to a steel tower 1 and a main line 3. Near the end, hang the hanging rod 6
The main wire 3 and the rigid rod body 5 are electrically connected to each other by a connecting conductor 7, and the rigid rod body 5 is suspended horizontally through a connecting conductor 7. As shown in the figure, multiple (for example, two) conductive metal rods 8 such as aluminum pipes
A known configuration is such that the spacer 9 is held between the clamp portions 9C of the upper member 9A and the lower member 9B, and fixed by fasteners 10 such as bolts and nuts, so that they are maintained in parallel with each other. .

However, in a jumper device having such a structure, the portion having the maximum potential gradient in the vertical direction in the energized state exists near the bottom of the clamp portion 9C shown in FIGS. 4 and 5, and the rigid rod body The rainwater adhering to each part of 5 will eventually concentrate on the bottom surface, which is the lowest part of the clamp part 9C, as shown by the arrows in FIGS. 4 and 5, and raindrops A will frequently hang down there. According to
The potential gradient with respect to other phases or the ground becomes significantly high in that part, and as a result, the amount of corona discharge near the bottom of the clamp part 9C increases, and this corona discharge causes audible noise and radio noise. .

``Purpose of the Invention'' The present invention is intended to effectively solve the above-mentioned problem in conventional jumper devices in which the amount of corona discharge increases due to the generation of raindrops.

"Structure of the invention" The present invention forms a rigid rod body by fixing a plurality of conductive metal rods in parallel with each other via a spacer, and the lowermost part of the clamp part of the spacer is connected to the conductive metal rod. It is located above the bottom of the rod.

“Example” Hereinafter, one example of the jumper device of the present invention will be described as a first example.
This will be explained with reference to the figures and FIG. In addition, the third
Description of parts common to the prior art shown in FIGS. 5 through 5 will be omitted.

The present invention is similar to the conventional structure in that the rigid rod body 5 is formed by a plurality of conductive metal rods 8 fixed in parallel with each other with spacers 9 interposed therebetween. As shown in FIGS. 1 and 2, the lowest part of the clamp portion 9C of the spacer 9 that fixes the conductive metal rods 8 to each other is located above the bottom surface of the conductive metal rods 8. There are some structural features in this point.

Therefore, rainwater adhering to the upper member 9A of the spacer 9 and the top surface of the conductive metal rod 8 reaches the bottom surface of the conductive metal rod 8 via the side surface of the conductive metal rod 8, and from there. It will drip. In this case, the conductive metal rod 8 is long and has a horizontal bottom surface, and the bottom of the clamp portion 9C of the spacer 9 is located at a higher position than the bottom surface of the conductive metal rod 8. , the chances of raindrops protruding from the lower member 9B of the spacer 9 are reduced, and as shown in FIG. Disperse and drip. Therefore, an increase in the potential gradient in the vicinity of the rigid rod body 5 can be suppressed.

In addition, in the examples of FIGS. 1 and 2, two conductive metal rods 8 are used, but the number is not limited, and the conductive metal rods 8 may be used for power lines or for improving potential gradient. This also includes so-called dummy conductors arranged in parallel with the power line.

Furthermore, the opening dimension B in the circumferential direction between the upper member 9A and the clamp portion 9C of the lower member 9B in the spacer 9 is determined by the conductive metal rod 8 as shown in FIG.
It is necessary to make the diameter smaller than the diameter D of
In that case, the shape is not limited to the examples shown in FIGS. 1 and 2.

"Effects of the Invention" As explained above, according to the present invention, the lowest part of the clamp part of the spacer that grips the conductive metal rod is located above the bottom surface of the conductive metal rod. Rainwater does not drip from the clamp part of the spacer in a concentrated manner, but instead drips from the bottom of the conductive metal rod in a dispersed state along its length, thus reducing the corona discharge of the jumper device. This makes it possible to significantly reduce the generation of audible noise and radio noise based on the conventional technology.

[Brief explanation of drawings]

FIG. 1 is a side view showing the main parts of a jumper device according to an embodiment of the present invention, FIG. 2 is a side view taken in the direction of the - arrow in FIG. A schematic side view showing the configuration, Figure 4 is the third
Figure 5 is a cross-sectional view of Figure 4 as seen from Figure 4.
It is an arrow view. 1... Steel tower, 2... Tensile insulator chain, 3... Main line,
4... Metal fitting, 5... Rigid rod body, 6... Hanging rod, 7... Connection conductor, 8... Conductive metal rod, 9...
...Spacer, 9A...Upper member, 9B...Lower member, 9C...Clamp portion.

Claims (1)

[Scope of utility model registration request] A rigid rod body 5 is suspended by a hanging rod 6 connected to a metal fitting 4 located between the tensile insulator chain 2 and the main line 3, and the rigid rod body 5 and the main line 3 on both sides of the steel tower 1 are connected by a connecting conductor 7. In the electrically connected jumper device, the rigid rod body 5 is formed of a plurality of conductive metal rods 8 fixed in parallel with each other with a spacer 9 interposed therebetween. The bottom part of the clamp part 9C is
A jumper device for an overhead power transmission line, characterized in that the jumper device is located above the bottom surface of a conductive metal rod 8.