JPS6311017A - Overhead transmission line - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an overhead power transmission line that has low noise, low snow accumulation, excellent effects on preventing gear roping, and excellent effects on preventing corona noise.

[Prior Art and Problems] A low wind noise electric wire or an electric wire with low snow accretion resistance is known in which a spiral wire 2 is wound around the outer periphery of an electric wire 1 as shown in FIG.

However, if this spiral wire 2 is wound only in the same direction, the aerodynamic characteristics will not be stable against the rotational motion.
The spiral wire 2z and the eight-wound spiral wire 2S are mixed and wound to stabilize one-spin motion. The same thing can be said about the effect of preventing snow from accreting, and in order to improve the ability to remove snow from the wire, a mixed winding as shown in Fig. 6 is also used.

On the other hand, in the case of a multi-conductor power transmission line, if the winding direction is the same between the adjacent conductors, the noise reduction effect will be less. It has also been found that by configuring the wires so that one side is zw2z and the other side is 5W2s, the noise suppression effect is significantly improved.

However, when winding a bare spiral around an electric wire in this way, two types of cable wire, 8 turns and 7 turns, are always prepared, and even when winding these two types of strands, extreme care must be taken. Selective winding is extremely complicated and troublesome in terms of manufacturing, construction, and management.

Moreover, when the bare wire is wound around the outer circumference of the electric wire as described above,
During rainfall, rainwater is collected by the spiral wire and forms large water droplets on the convex portions of the wire, increasing the potential gradient and potentially worsening the so-called audible noise (AN) characteristics due to corona.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and the strands to be attached to the electric wire may be one type of molded body, and the molded body contains the above-mentioned S, Z mixture. It is an object of the present invention to provide an overhead power transmission line in which novel strands are bonded, which can exhibit various effects and also improve the AN characteristics.

[Summary of the Invention] In other words, the gist of the present invention is to form a molded body with repeating tops and valleys using the same wire, and to suitably fit the molded body around the outer periphery of the electric wire. This is attached to an electric wire in a υ curved configuration, and after attachment, the top or valley of the molded body is located at the same position as the lower surface of the electric wire or is located above it. By simply joining the N wire, it is possible to expect an effect that is as good as or better than the above-mentioned S and Z mixed amount.

[Example] The present invention will be explained below based on Examples.

FIG. 1 is a plan view showing a state in which a formed wire 3 according to the present invention is attached to an electric wire 1, and FIG. 2 is a front view thereof.

The formed wire 3 is first formed into a meandering shape having a predetermined top portion 3a and a predetermined trough portion 3b. Thus, the strands formed in this manner have their entire meandering plane formed into a curved surface that can be fitted snugly to the outer peripheral surface of the electric wire 1, and are fitted from the top to the bottom of the wire.

FIG. 2 shows the state in which the formed wire 3 is attached to the electric wire 1 in this way. In FIG. is on the back side of the electric wire), but the lowest point of the valley 3b is
A feature of the present invention is that the wires are attached to the lower surface of the electric wire 1 at the same position or above it. (This also applies to the top portion 3a side.

) According to the overhead power transmission line according to the present invention configured as described above, it is only necessary to prepare one type of shaped strand 3, instead of always preparing two types of strands, 8 turns and 7 turns, as in the conventional example. This eliminates the hassle of preparing and winding the winding while selecting it. That is, the top portion 3a or the valley portion 3
One side of the strand forming b has the same effect as 8 turns, and the other side facing it has the same effect as 7 turns, in short, 8 turns and 7 turns coexist in the same strand. With this structure, it is possible to achieve not only the effects of the conventional example of combining s and zi windings, but also to significantly stabilize the aerodynamic effect, and to achieve a particularly remarkable effect in preventing gear lopping, especially in photographing. be.

Furthermore, the shaped wire 3 according to the present invention is not wound around the outer periphery of the electric wire 1 as in the conventional example. In the case of conventional wound strands, rainwater collects during rainfall and forms and adheres to large water droplets, which deteriorates the AN characteristics. However, in the case of the wire according to the present invention, since there is no winding and the top or valley portion is located at the same level as or above the lower surface of the wire, a capillary phenomenon occurs between the wire and the wire. It was also confirmed through experiments that there was no movement of large water droplets as in the conventional example, and the AN characteristics were significantly improved.

In order to roughly improve this AN characteristic, it is preferable to form longitudinal grooves in the formed wire, thereby further promoting the capillary phenomenon and increasing the flattening effect of water droplets.

By the way, the top portion 3a and the valley portion 3b of the wire 3 according to the present invention do not always have to have the same height or the same pitch in terms of a sine curve. In other words, as shown in Fig. 2, by creating a difference between the difference tl and t2 from the lower surface of the wire, and by creating a difference between the pitch between Pl and Pz, the turbulence of the air fluid can be reduced. It can enhance the effect of drifting and cutting snow.

Moreover, FIGS. 3 and 4 are a plan view and a front view showing another embodiment of the overhead power transmission line according to the present invention.

In the case of this embodiment, at least one end 4 of the formed wire 3 is spirally wound with a half pitch or more (in this embodiment, both ends). By providing this, it is possible to further securely fix the shaped wire 3 to the electric wire 1, and it is possible to increase the differences jl and jZ from the lower surface of the electric wire shown in FIG. This makes it possible to further improve the AN characteristics.

However, the location where this spiral winding is performed is not limited to the end portion, but may be the middle portion.

In addition, in order to emphasize a specific effect, the top or valley part should be made to extend more roughly than the bottom surface of the wire, and the V-shaped 360
It is also possible to wrap it in a configuration that exceeds the curve of the degree.

[Effects of the Invention] As described above, according to the overhead power transmission line according to the present invention, the following excellent effects can be achieved.

(1) Since the bottom of the shaped wire is at the same level as or above the bottom of the wire, it does not increase the potential gradient of the wire and exhibits excellent AN characteristics.

(2) Since both the S direction and the Z direction are formed by a single molded wire, it is aerodynamically stable and vibrations, especially gear roping, can be largely prevented.

(3) Demonstrates excellent wind noise prevention properties even when applied to multi-conductors.

(4) In addition to being made of S and Z1M, the bottom part exists below, so it is highly effective in preventing the rotational growth of snow, and can be expected to have excellent characteristics as a snow-resistant electric wire.

[Brief explanation of the drawing]

FIG. 1 is a plan view of one embodiment according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a plan view of another embodiment according to the present invention, FIG. 4 is a front view thereof, and FIG. 7 are explanatory diagrams showing specific examples of conventional spiral strand winding systems. 1... Electric wire, 3... Molded wire, 4... Winding is part. Agent Patent attorney Fujio Sato f + mouth 7 = 3 2 + ``: Denza J: m, h Hata Tsuba 4: Mokuchi part

Claims (2)

[Claims] (1) The same strand is formed into a molded body with repeated tops and valleys, and the molded body is formed into a curved structure that can be comfortably attached to the outer periphery of the electric wire, and this is attached to the electric wire. Later, an overhead power transmission line configured such that the top or valley of the molded body is located at the same position as the lower surface of the wire or is located above it. (2) The overhead power transmission line according to claim 1, wherein at least one portion of the molded body is spirally wound around the wire at a pitch of half a pitch or more.