JPH0650925B2 - Wind noise reduction device for hard-to-snow electric wires - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for reducing wind noise in a multi-conductor snow-adhesive electric wire having a snow-adhesive ring attached thereto.

[Prior Art] When snow builds up on an overhead power transmission line, the weight of the snow causes a transient sag or a disconnection accident. When a cross wind blows on the overhead power transmission line, wind noise is generated. For the transmission line, ring-shaped snow-falling rings are attached at regular intervals to prevent large snow accretion. For wind noise, multiple spiral rods are wound around the transmission line to form a uniform Karman vortex. To reduce wind noise. When the power transmission line is a double conductor, spiral rods are installed at intervals of about 20 to 50 m for wind noise, and a snow-diffusing ring is set to about 0.3-1.5 m for snow accretion. In order to reduce wind noise in the power transmission line to which the snow-hardening ring is attached, the spiral rod is attached to the power-transmission line together with the snow-hardening ring.

In addition, a coil with a spiral wire attached to the transmission line, which is not for preventing wind noise, has a coil pitch that varies depending on the temperature when the snow is icing like the icing / snow removing device for overhead lines of No. 59-34433. A shape memory alloy wire coil that shrinks is wound around an overhead wire, and a coil spring is connected to one end of the shape memory alloy wire coil to energize the shape memory alloy wire coil so as to extend the pitch of the shape memory alloy wire coil. The end of the wire coil and the end of the coil spring are fixed by a fixing ring attached to the overhead wire, and when the temperature of the overhead wire reaches the temperature at which icing snow occurs, the shape memory alloy wire coil is deformed and moves to reduce the pitch and wear. There is known an accretion / snow removal device that splits ice and breaks it.

In addition, as in the device for preventing snow accretion on overhead power lines of JP-A-64-30417, a composite core made of a ferromagnetic ring and a ferromagnetic inclusion having a low Curie point of 0 ° C. or higher is used for the outer periphery of the power line. A ferromagnetic wire made of a ferromagnetic material having a low Curie point of 0 ° C. or higher is loosely fitted on the surface of the composite core, and is wound around the power transmission line on both sides of the composite core. A known anti-icing and snow-prevention device is one that presses both ends of the composite core to prevent the composite core from moving in the direction of the power transmission line, and when ice accretion occurs, the composite core made of a ferromagnetic material and the winding wire material will cause the snow to melt. Has been.

[Problems to be Solved by the Invention] When a long spiral rod is wound around the power transmission line and the snow-driving ring in order to reduce wind noise in the power transmission line having the snow-diffusing ring as described above, The spiral rod floats up in the form of a bird cage on the outer circumference of the snow-hardening ring, which not only results in increased wind noise, but also reduces the winding force due to the tip of the spiral rod that has risen, resulting in corona characteristics. There is a problem in that

Further, if the spiral rod is continuously and evenly wound around the power transmission line, there is a problem that a uniform Karman vortex is generated when a cross wind blows on the power transmission line and wind noise cannot be completely prevented.

Especially in the case of multi-conductor transmission lines, if the spiral rod is continuously and evenly wound around each span conductor, there is a problem that the load on the whole span conductor increases excessively. .

When the surface of the electric wire is smooth, snowflakes tend to rotate around the electric wire and grow in a tubular shape, and it is difficult to prevent snow from accumulating even if a snow-hardening ring is attached.

In addition, the above-mentioned utility model unveiled icing and snow removal device for overhead lines is
When the temperature at which icing snow occurs occurs, the shape memory alloy wire coil and the coil spring wound around the overhead wire deform and move to change the pitch, so that wind noise cannot always be prevented.

In addition, the device for preventing icing and snow accretion of overhead power lines disclosed in the above patent is
Ferromagnetic wire rods wound on both sides of the composite core to prevent movement of the ferromagnetic composite core loosely fitted to the power transmission line are uniformly wound in the power transmission line direction, so receive a cross wind. As a result, uniform Karman vortices occur and wind noise cannot be completely prevented.

In particular, the conventional spiral rod, the shape memory alloy wire coil and the coil spring disclosed above, or a ferromagnetic winding wire, which continuously winds a spiral wire around a power transmission line, When applied to a multi-conductor transmission line, there is a problem that not only the load of the whole multi-conductor becomes extremely large, but also wind noise generated in each element conductor cannot be completely prevented.

The present invention solves the above-mentioned problems, reduces wind noise of a multi-conductor transmission line to which a snow-drinking ring is attached, prevents icing snow, and prevents an excessive load from being applied. It is an object of the present invention to provide a wind noise reduction device for a snow-falling electric wire in a multi-conductor transmission line.

[Means for Solving Problems] In order to solve the above problems, the wind noise reduction device for a snow-diffusing electric wire according to the present invention includes the snow-diffusing rings 2 at intervals between the individual conductors 1p and 1s. In the installed multi-conductor transmission line, dual conductors 1
Each p, 1s snow ring attachment interval a, b, c ......... h,
Spiral rods 3p and 3s are alternately wound in i in the direction of the power transmission line, and the winding directions are alternately changed to the right-hand twist direction and the left-hand twist direction on both conductors 1p and 1s. The wind noise is reduced.

[Operation] Spiral rods 3p, 3s wound around the snow-retaining ring mounting intervals a, b, c ..... h, i of both conductors 1p, 1s of the multiconductor transmission line are replaced by both conductors 1p, By alternately winding in 1s and changing the twisting direction to right twist and left twist, the Karman vortices generated when a cross wind is received are not formed uniformly and wind noise is reduced.

Further, since the spiral rods 3p and 3s are wound in the snow-drinking ring attachment intervals a, b, c ... H, i, and cannot be floated on the snow-draining ring 2 and wound, a cross wind is applied. Karman vortices are not formed even when receiving, and wind noise is reduced. Moreover, since the tip of the spiral rod does not float, the corona characteristics do not deteriorate and the winding force of the spiral rod does not decrease.

When the cross wind blows, the twisting directions of the spiral rods 3p and 3s are alternately changed for the two conductors 1p and 1s arranged in front and back in the same plane, so that the lift vector is canceled when the cross wind is received. Because it can, galloping does not occur.

Further, the spiral rods 3p, 3s are arranged at intervals of every other mounting interval of the snow-drinking ring 2 for one element conductor (in the element conductor 3p, intervals a, c, e, g, i, element conductors). In 3 s, since the windings are wound at intervals b, d, f, h), the load of the entire multiconductor does not become excessive.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. 1p and 1s are the individual conductors of the multiconductor transmission line.The strands are twisted from the right or left to form a stranded wire with a circular cross section, or the sector-shaped strands are stranded into a circular shape to form a surface. It is a smooth electric wire. Fig. 1 shows a multiconductor transmission line in the case where the element conductor is a double conductor of 1p and 1s.

Reference numeral 2 is a snow-repellent ring formed of plastic, metal or an appropriate material in an annular shape, and a plurality of snow-repellent rings 2, 2, ... Are spaced between the spacers 4 and 4 attached to the element conductors 1p and 1s. The mounting intervals of a, b, c, d, e, f, g, h, i ..., For example, the mounting intervals of about twice the twist pitch of the electric wires are used.

3p and 3s are spiral rods wound around the individual conductors 1p and 1s, and the winding length of the spiral rod is shorter than the mounting interval (a or b or c ...) Between the snow-retaining rings 2 and 2 described above. Each element conductor 1p within the mounting interval between the snow-drinking rings 2 and 2,
Wrap around 1s.

This spiral rod is formed by winding one spiral rod 3 around the conductor 1 as shown in FIG. 2, or as shown in FIG. 3, two spiral rods 3 facing each other on the diameter line of the conductor 1. Wrap around.

By winding the spiral rod within the mounting interval of the snow-hardening ring 2 as described above, the spiral rod is wound without floating, so that Karman vortices are not formed even if a cross wind blows on the power transmission line, and wind noise is generated. Is reduced and the tip of the spiral rod does not float up, so the corona characteristics do not deteriorate and the winding force of the spiral rod does not decrease.

Spiral rod 3p wound around each element conductor 1p, 1s,
3s is a right-twisted spiral rod 3p that alternates between the two conductors 1p and 1s at every other mounting interval of the snow landing ring 2 and the twisting direction is changed. And wrap the left-handed spiral rod 3s. One element conductor
For 1p, a right-twisting spiral rod 3p is wound around every other space a, c, e, g, i between the snow-fighting rings 2, 2, ... And for the other element conductor 1s. A left-twisted spiral rod 3s is wound around every other interval b, d, f, h.

As described above, the right-twisted spiral rod 3p and the left-twisted spiral rod 3s are alternately arranged in the transmission line direction with respect to the element conductor 1p and the element conductor 1s arranged in front and back in the same plane when a cross wind blows. Since the twisting direction of the spiral rod changes depending on the mounting pitch of the snow-hardening ring, the formation of uniform Karman vortices is prevented and wind protection is reduced. Even when galloping when a cross wind is received, the twisting directions of the spiral rods are alternately reversed, so that the lift vectors are offset and galloping is prevented.

In addition, the spiral rod 3p wound around each element conductor 1p, 1s,
3s is not wound continuously on each of the two element conductors 1p and 1s, but is wound on every other interval of the attachment intervals of the snow-diffusing ring 2 for both element conductors 1p and 1s. The overall load does not increase excessively, and the wind noise of the multiconductor transmission line can be reduced with a small number of spiral rods.

When snow accretes on the surface of the element conductor, the snow mass moves in the direction of the power transmission line while rotating the conductor surface along the twisting direction of the spiral rods 3p and 3s, and hits the snow adhering ring 2 when Progress is blocked, rotation around the wire is blocked,
Before it grows into an oversized cylinder, it falls due to the weight of the snow mass.

[Advantage of the Invention] As described above, the wind noise reducing device for a snow-adhesive wire of the present invention is
Spiral rods were alternately wound in the direction of the power transmission line within the interval of attachment of the snow-fighting ring of each element conductor of the multiconductor transmission line, and the winding direction was changed alternately for each element conductor. Load is not excessive, wind noise can be greatly reduced, and since the spiral rod cannot be floated and wound around the snow-retaining ring, it prevents the corona characteristics from deteriorating and also reduces the spiral rod. It prevents the winding force from decreasing, and the twisting direction of the spiral rod alternates in opposite directions for each element conductor, so when lifted by a crosswind, the lift vector is canceled and galloping does not occur.
It is possible to prevent snow accidents.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, FIG. 2 and FIG. 3 are cross-sectional views showing a winding state of a spiral rod on the outer circumference of a conductor. 1p, 1s: Elementary conductor 2: Snow-drinking ring 1p, 1s: Spiral rod a, b to h, i: Mounting interval of snow-draining ring

Claims (1)

[Claims] 1. In a multi-conductor transmission line in which snow-repellent snow rings are attached to each element conductor at intervals, spiral rods are alternately wound in the transmission-line direction within the snow-attack ring attachment intervals of both element conductors. A wind noise reducing device for a snow-resistant electric wire, characterized in that the winding directions of the two conductors are alternately changed to the right-hand twist direction and the left-hand twist direction.