JP2552609Y2 - Wind noise prevention device for electric wires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to an apparatus for preventing wind noise generated from an overhead transmission line or the like.

[Conventional technology]

As shown in FIGS. 3 and 4, a conventional wind noise prevention device for an electric wire is formed by winding a metal wire 2 having a circular cross section around an electric wire 1 such as an ACSR. When the metal wire 2 is wound, Karman vortices generated on the leeward side of the electric wire 1 are disturbed by wind, and wind noise of 100 to 200 Hz generated from the electric wire 1 can be suppressed.

〔Task〕

Wind noise is reduced by winding the metal wire 2, but since the metal wire 2 is conductive and must be considerably protruded from the surface of the electric wire 1 to disturb the Karman vortex (for example, an outer diameter of 38.4 mm). (A metal wire with an outer diameter of 7 mm is wound around the wire.)
Corona easily occurs as shown by the arrow in FIG. 4, which causes corona noise and corona hum (100 Hz or 1200 Hz).

[Means for solving the problem and its operation]

To suppress corona generation, use a metal
As shown in FIG. 5, it is conceivable to wind an insulating wire 3 made of plastic or the like. However, when the insulating wire 3 is used, electric charges are induced on the surface of the insulating wire 3 near the electric wire 1. Corona discharge occurs between the electric wire 1 and the insulative wire 3 as indicated by a double arrow in FIG.

In addition, as described in Japanese Utility Model Application Laid-Open No. 59-173426, the portion 6 in contact with the aluminum alloy electric wire is made smooth, and a spiral rod provided with a foam on the outer top is wrapped to suppress corona generation. Some suggestions have been made. However, since this foam uses a water-absorbent foam, the foam is filled with rainwater during long-term rainfall, and even if an insulating foam is used, the foam is electrically conductive. It becomes substantially the same as the one obtained by winding the metal wire 2 as shown in FIGS. 3 and 4 described above,
For this reason, the potential gradient of the foam surface becomes large, and corona is easily generated from the foam surface.

Therefore, the present invention provides an electric wire wind noise prevention device in which a wire is attached to an electric wire so as to protrude from the surface thereof.
The above-mentioned linear body is characterized in that a conductor having a contact surface on the side that contacts the electric wire has a curvature that matches the outer peripheral surface on the electric wire side, and a projecting side that does not contact the electric wire is integrally formed of an insulator having no water absorption. Is what you do.

In this case, since the side of the linear body that contacts the electric wire is a conductor, corona discharge does not occur between the electric wire and the linear body as shown in FIG. In addition, the side of the linear body that does not come into contact with the electric wire is an insulator without water absorption.
The corona discharge described above does not occur.

Of course, the projecting height of the linear body from the surface of the electric wire is set to a height that disturbs the Karman vortex formed on the leeward side of the electric wire and suppresses wind noise.

In addition, it is preferable that the linear body is formed in a spiral shape in advance in order to facilitate winding around the electric wire.

〔Example〕

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 this wind noise prevention device, a conductor 4 made of metal or conductive plastic or the like is integrated with a conductor 4 made of metal or conductive plastic and a non-water-absorbing insulator 5 made of rubber or plastic or the like is integrated with the conductor 1. The configured composite linear body 6 is spirally wound around the electric wire 1. The cross-sectional shape of the linear body 6 is substantially a squamous shape, and its height is the same as that of a conventional wind noise prevention metal wire (see FIG.
4 is equal to the outer diameter of 2). In addition, the linear body 6
Inside (the inner surface of the conductor 4) has a curvature matching the outer peripheral surface of the electric wire 1, and the outer surface (the outer surface of the insulator 5 having no water absorption) has the same curvature as the outer peripheral surface of the conventional wind noise prevention metal wire. It has become.

FIG. 2 shows another embodiment of the present invention. This wind noise prevention device is the same as the above-described embodiment in that a composite linear body 6 composed of a conductor 4 and an insulator 5 having no water absorption is wound around the electric wire 1. The insulator 5 has a substantially triangular shape, and the curvature of the peak of the insulator 5 having no water absorption is larger than the curvature of the outer peripheral surface of the conventional wind noise prevention metal wire. In this way, the water droplets 7 formed below the linear body 6 during rainfall are smaller than in the above-described embodiment, and corona does not easily come out of the water droplets 7.

In the above embodiment, the case where the wire is wound around the wire and fixed is described, but the present invention is not limited to this, and a wind noise prevention device of a type in which a wire of an appropriate length is attached to the wire by a ring or the like. Is also applicable.

[Effect of the invention]

As described above, according to the present invention, since the side of the wire attached to the wire that does not come into contact with the wire is made of an insulator having no water absorption, the generation of corona from the outer surface of the wire can be suppressed. In addition, since the side of the linear body that is in contact with the electric wire is made of a conductor, the occurrence of corona between the electric wire and the linear body can be suppressed, and the contact surface has a curvature that matches the outer peripheral surface of the electric wire, Corona generation between the electric wire and the linear body can be more reliably suppressed. In addition, since the conductor portion and the insulator portion of the linear body are integrally formed, no electric charge is induced in the insulator portion, so that corona generation can be suppressed.

Therefore, both wind noise prevention and corona suppression can be achieved, and its practical value is extremely large.

[Brief description of the drawings]

FIGS. 1 and 2 are cross-sectional views showing an embodiment of a wind noise prevention device according to the present invention, respectively. FIGS. 3 and 4 are side and cross-sectional views showing a conventional wind noise prevention device. FIG. 2 is a cross-sectional view showing an improvement of a conventional wind noise prevention device. 1 is an electric wire, 4 is a conductor, 5 is an insulator having no water absorption, 6 is a linear body, 7 is a water droplet.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Kamiyama 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Industry Co., Ltd. Referee Chief Judge Isamu Hama Judge Judge Masatoshi Koike Judge Hajime Nishikawa (56) References Open Sho 64-16210 (JP, A) Open Sho 58-166236 (JP, U) Open Sho 59-173426 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] In a wind noise prevention device for an electric wire, wherein a wire (6) is attached to an electric wire (1) so as to protrude from the surface thereof, said wire (6) comes into contact with the electric wire (1). Conductor (4) whose contact surface has a curvature that matches the outer peripheral surface on the electric wire side
And a protruding side that does not contact the electric wire (1) is integrally formed of an insulator (5) having no water absorption.