JPH0514499B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for suspending a corona suppressing extension wire attached to a multi-conductor power transmission line from the power transmission line.

[Conventional technology]

Generally, in ultra-high voltage power transmission lines, the first electric wire is divided into a plurality of elementary conductors 1 to form a double conductor, and each elementary conductor 1 is attached to a spacer 2, as shown in FIGS. 8 and 9, which show conventional examples. Therefore, for example, although they are arranged in a polygonal shape such as a quadrangle, hexagon, or octagon as shown in the figure, it is important that the potential gradient is maximum at the outside of the polygon formed by each element conductor 1, and that raindrops are When the raindrops adhere to the conductor 1, they form a protrusion on the lower surface of the elementary conductor 1, so that the potential gradient becomes especially large on the lower surface of the lower elementary conductors 1, 1a, and corona is likely to occur.

Therefore, as shown in the figure, a metal extension wire 3 is placed below the lower elemental conductor 1a along the power transmission line, and the presence of this extension wire 3 reduces the potential gradient on the lower surface side of the lower elemental conductor 1a. The conventional method of suspending the wire 3 is to use a suspension member 4 attached to the lower element conductor 1a.
This was to suspend the extension wire 3. Note that, at the position where the spacer 2 is present, the extension wire 3 is supported by the spacer 2.

[Problem that the invention seeks to solve]

In the conventional wire hanging method, the wire supporting load is mainly applied to the lower element conductor 1a via the suspension member 4, so that the tension of each element conductor 1 becomes unbalanced. Since such tension imbalance is undesirable, the present invention aims to solve this problem.

[Means for solving problems]

In the present invention, in order to solve the above-mentioned problems, the extension wire is suspended from different elementary conductors via suspension members at each position in the length direction, so that the extension wire support load is evenly distributed to each elementary conductor. I made it so that it would be done.

〔Example〕

A first embodiment of the method of the present invention will be described with reference to FIGS. 1 to 4. In this example, four elementary conductors 1
This is a multi-conductor power transmission line arranged in a square shape by spacers 2, and a metal extension wire 3, which is not a power line, is arranged along the power transmission line at a slightly lower position midway between the two lower elementary conductors 1a. The spacer 2 has four arms 2b attached to a circular member 2a at the center, and holds each elementary conductor 1 at the tip of each arm 2b.A hanging member 5 is attached to the lower side of the spacer 2, This hanging member 5 grips the extension wire 3 for corona suppression.

The above is almost the same as the conventional example, but in the present invention, the support between the spacers 2 is supported by the T-shaped hanging members 6 with long legs 6a attached to the left and right upper elementary conductors 1b, and the support between the left and right upper elementary conductors 1b. The support of the legs 7a attached to the lower element conductor 1a by the short T-shaped hanging members 7 is alternately repeated.

According to the above-mentioned supporting method, the wire supporting load applied to each elemental conductor 1 is evenly distributed, and an imbalance in the tension of each elemental conductor 1 does not occur.

Further, in the multi-conductor power transmission line as described above, the presence of the extension wire 3 lowers the potential gradient on the lower surface side of the lower elementary conductor 1a, so corona generation is suppressed.

In addition, as the attachment wire 3 for corona suppression, a metal pipe 3a is used as shown in FIG. 3, or a large number of metal wires 3 are used on a metal pipe 3a as shown in FIG.
It is possible to use a material obtained by twisting B. The purpose of using a pipe as shown in Fig. 3 is to reduce the weight, and further twisting the metal wires 3b as shown in Fig. 4 prevents the formation of water droplets due to capillary action, so corona can occur in the extension wire 3. This is because it is preferable in terms of suppressing. In addition, a preform rod may be wrapped around the wire 3 to prevent wind noise, and the surface of the wire 3 and the preform rod may be coated to make it hydrophilic to further prevent the generation of water droplets. can be achieved. Further, the extension wire 3 may be a corrugated pipe to improve flexibility, or may be a simple twisted conductor instead of a pipe, or a solid conductor.

5 and 6 show a second embodiment in which the method of the present invention is applied to a 6-conductor power transmission line, in which the supporting wire 3 is supported by a hanging member 5 attached to the spacer 2, and between the spacers 2, It is attached by a T-shaped hanging member 6 attached to the upper elementary conductor 1b, a T-shaped hanging member 8 attached to the intermediate elementary conductor 1c, and a T-shaped hanging member 7 attached to the lower elementary conductor 1a. Support line 3.

FIG. 7 shows a third embodiment in which the method of the present invention is applied to an 8-conductor power transmission line. In this embodiment, the central lowest element conductor 1 among the element conductors 1 arranged in an octagonal shape
Two extension wires 3 are arranged at the lower positions between d and the elementary conductors 1e on the left and right, respectively, and these extension wires 3 are connected to the lower stage by π-shaped hanging members 9, 10, 11. The element conductor 1e, the middle element conductor 1f, and the upper element conductor 1g are suspended, respectively.

〔Effect of the invention〕

As explained above, according to the method of the present invention, the extension wires are suspended from different element conductors via the suspension members in each length direction, so that by adding the extension wires, the lower element conductor is The potential gradient on the lower surface side is reduced and corona generation is suppressed, and in addition to this,
Since the wire support load is evenly distributed to each element conductor, when the weight of the wire is supported by each element conductor, the load is not applied unevenly to a specific element conductor, and the load is almost uniformly distributed to each element conductor. The amount of deflection is evenly distributed, the degree of deflection is averaged, the amount of deflection is reduced compared to the case where the weight is supported by a specific elementary conductor, and tension imbalance between the elementary conductors is prevented. I can do it.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of a power transmission line to which the method of the present invention is applied, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a cross-sectional view showing an example of a corona suppression wire. ,
FIG. 4 is a cross-sectional view showing another example of the above-mentioned extension line;
The figure is a side view showing a second embodiment of the power transmission line to which the method of the present invention is applied, FIG. 6 is an enlarged sectional view taken along the line - in FIG. 5, and FIG. FIG. 8 is a side view showing a conventional example of a power transmission line having an attachment wire for corona suppression, and FIG. 9 is an enlarged sectional view taken along the line - in FIG. 8. 1... Elementary conductor, 1a... Lower elementary conductor, 1b...
... Upper elemental conductor, 1c... Middle elemental conductor, 3...
Wire for corona suppression, 6, 7... Hanging member.

Claims (1)

[Claims] 1. In a power transmission line in which a corona suppressing wire is attached along the lower part of a multi-conductor power transmission line consisting of a plurality of elementary conductors, the wire is attached at each longitudinal position via a suspension member. A method for suspending an attachment wire for corona suppression in a power transmission line, characterized by suspending it from different elementary conductors and distributing the attachment wire supporting load equally to each elementary conductor.