JPS59216415A - Winding unit for aerial wire - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wrapping body for an overhead electric wire that is spirally wrapped around the outer circumference of an overhead electric wire to suppress snow accumulation on the overhead electric wire and wind noise.

Originally, it was used as a method to suppress snow accumulation on overhead power lines and wind noise.
2. Description of the Related Art A method is known in which a wrapping body made of metal such as aluminum and having a circular cross section is wound spirally around the outer periphery of an overhead electric wire.

However, when an electric wire is wrapped with the above-mentioned wrapping body, when water such as rain adheres to the electric wire, this water or water that has soaked into the inside of the electric wire seeps out, and this causes spherical water droplets to form on the outside surface of the wrapping body. As a result, a large number of particles adhere to each other, and a corona discharge is generated from this.
There was a risk of causing problems such as corona noise.

On the other hand, it may be possible to make the surface of the wound body hydrophilic to prevent a large number of spherical water droplets from adhering to the surface of the wound body. The water collects on the part of the wrapped body located below the wire, and this becomes large water droplets and adheres due to surface tension. and,
These water droplets become water droplets with a large curvature due to the hydrophilic treatment of the surface of the wound body, and therefore, there is a possibility that a brush-like corona discharge is generated and a large corona noise is generated.

An object of the present invention is to prevent water from forming into spheres and adhering to a large amount of water even in the event of rainfall, etc., in a wrapping body for overhead electric wires, and to prevent water from flowing and collecting on a portion of the wrapping body located below the electric wire. To provide a wrapping body for an overhead electric wire that has good water drainage properties so that attached water droplets do not become large.

In order to achieve the above object, the present invention has the following configuration.

That is, the present invention provides a wrapping body for an overhead electric wire that is wound around the outer periphery of an overhead electric wire, and the wrapping body has its surface treated to make it hydrophilic, and the shape of the surface on the side opposite to the wire in the cross section is approximately 50 mm.
It forms a cusp shape with an opening angle of 120 degrees.

The reason why the opening angle is limited to approximately 50 to 120 degrees is as follows.

That is, when the opening angle is made smaller by about 50 degrees, the sharpness becomes stronger, and the area that exerts surface tension on the flowing water on the part of the wrapping body located below the wire becomes smaller. This is because the water drainage property is improved and the risk of large water droplets is reduced, but on the other hand, if the opening angle is smaller than about 50 degrees in the absence of rain, etc., corona noise due to corona discharge will suddenly increase.

In addition, when the opening angle exceeds approximately 120 degrees, the corona noise due to corona discharge during sunny weather is approximately the same as when it is 120 degrees or less, but when it exceeds 120 degrees during rainy days, the corona noise increases rapidly. This is because you end up doing it.

The present invention will be explained in more detail based on an embodiment shown in FIGS. 1 and 2.

In the figure, (1) shows a wrapped body according to the present invention, and (2) shows an overhead electric wire around which the wrapped body (1) is wound.

The winding (1) consists of a helically preformed aluminum rod, the inner diameter of which is slightly smaller than the outer diameter of the overhead wire (2).

Further, the outer surface of the wound body (1) has been subjected to a hydrophilic treatment. This hydrophilic treatment is performed by sandblasting with 100 to 150 mesh sand or shot to make the surface bloodless, and then boiling it with distilled water to perform boehmite treatment.

Further, the cross-sectional shape of the wound body (1) is a substantially equilateral triangle, and the top portions thereof are each chamfered with a radius of curvature of 2 to '5.

Therefore, the opening angle (θ) in this case is approximately 60 degrees, and the surface on the overhead wire (2) side is the inner surface (3) when preformed.
).

Note that the cross-sectional shape of the wrapped body (1) is not limited to a triangular shape; for example, as shown in FIG. The opening angle can be selected within the range of about 50 to 120 degrees, and the point is that the surface shape on the side opposite to the electric wire should have a pointed shape with an opening angle of about 50 to 120 degrees.

Next, the results of the effect confirmation test of the present invention will be explained based on FIGS. 4 and 5.

Figure 4 shows a wound body made of an untreated aluminum rod with a circular cross section (conventional product), and a wrapped body made of an untreated aluminum rod with a sandblasting and boehmite treatment and a cross-sectional shape similar to that shown in Figure 2 (inventive product). ) were manufactured, and the corona noise of each was measured by winding them around an overhead wire under the same conditions and sprinkling water on them.

The horizontal axis is the maximum surface potential gradient (KV/α) of each sample.
The vertical axis shows the degree of corona noise (dB(A)), the solid line shows the product of the present invention, and the 7-dot chain line shows the conventional product.

As is clear from the figure, the product of the present invention has significantly lower corona noise than the conventional product.

In addition, Figure 5 shows that the surface treatment and the surface shape on the opposite side of the wire are in a pointed shape, and the points are the same, but we have manufactured multiple wires with various opening angles of the pointed portion, and compared them in sunny weather and in rainy weather. The results of measuring corona noise at different times are shown.

In the figure, the horizontal axis is the opening angle, and the vertical axis is the degree of noise (dB (A
)), the solid line shows the results when it rains, and the chain line shows the results when it is sunny.

As is clear from the figure, when the opening angle is smaller than 50 degrees, the noise level during sunny weather increases rapidly, and when the opening angle exceeds 120 degrees, the noise level during rainy weather increases rapidly.

However, when we closely observed the state of water droplets during rain, we found that when the opening angle exceeds 120 degrees, the water droplets suddenly become sharper due to surface tension.

Furthermore, when the opening angle was smaller than 50 degrees, water was drained.

Although not shown, similar results were obtained with the device shown in FIG.

According to the wound body of the present invention, since the surface is hydrophilized and treated, the number of water droplets adhering to the wound body can be reduced, and corona noise can be suppressed accordingly. In addition, since the surface shape on the side opposite to the wire in the cross section of the wound body is shaped like a peak with an opening angle of approximately 50 degrees to approximately 120 degrees, the surface that exerts surface tension on water droplets is suppressed during rain, etc., and corona corona increases. Can suppress noise.

Still, since the degree of the apex shape is approximately 50 degrees or more, there are effects such as less corona generation and less corona noise even in sunny weather.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram for explaining one embodiment of the wrapping body for overhead electric wires of the present invention, FIG. 2 is an enlarged sectional view of the wrapping body for overhead electric wires according to the present invention shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing another embodiment, and FIGS. 4 and 5 are explanatory diagrams showing the results of an effect confirmation test of the wrapping body for overhead electric wires of the present invention, respectively. (1)...... Wrap body for overhead electric wires (2)...
・・・・・・Overhead electric wire shoes）・・・・・・・・・Overhead electric wire side (θ)・・・
...Opening Square box Fig. 1 Fig. 2 Fig. 3 Maximum surface potential gradient KV/cm Fig. 5 Opening angle

Claims (1)

[Claims] In the wrapping body for overhead electric wires that is wrapped around the outer circumference of overhead electric wires,
The winding body has its surface treated to be hydrophilic, and the surface shape on the side opposite to the wire in its cross section has a pointed shape with an opening angle of approximately 50 degrees to 120 degrees. Wrapped body.