JP2561708Y2 - Overhead transmission line spacer and overhead transmission line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a spacer capable of preventing galloping of an overhead transmission line and an overhead transmission line using the spacer.

[Prior Art] When ice and snow adhere to an overhead power transmission line and become wing-shaped, lift is generated and so-called galloping, which has an amplitude of several meters in a period of 2 to 10 seconds, is likely to occur.

This galloping often results in phase-to-phase short-circuits and, in severe cases, tower destruction.

In order to prevent this galloping, conventionally, measures such as attaching an interphase spacer to an overhead transmission line or attaching a galloping prevention damper have been taken.

〔Task〕

However, the method of installing the interphase spacer is such that the interphase spacer is made of a heavy insulator etc.
The weight causes an increase in the sag and tension of the electric wire, and there is a problem that it cannot be applied to all overhead transmission lines.

In addition, in the method of attaching the galloping prevention damper, in the case of a continuous suspension span or the like, the galloping cycle may be as long as 7 to 10 seconds, and a practical damper for such a long cycle may be used. There is a problem that design is difficult.

[Solutions to solve the problem]

In view of the above problems, the present invention is designed to provide a spacer itself for maintaining the conductor spacing of an overhead power transmission line to have a galloping preventing action. , Wherein the spring constant of the coil-shaped spring is reduced to such an extent that the coil-shaped spring bends due to icing and snow on the electric wire.

The present invention also provides an overhead transmission line that can prevent galloping by the action of the spacer, and the configuration is characterized in that the overhead transmission line spacer as described above is attached near the center of the span. Is what you do.

[Action]

In general, a spacer for maintaining a conductor interval is used for a multiconductor overhead transmission line in which one phase is composed of a plurality of electric wires of two or more. The purpose of using this spacer is
This is because a plurality of electric wires constituting one phase are attracted to each other by the electromagnetic force to reduce the conductor interval, thereby preventing corona from being generated. As described above, in the multiple conductor overhead transmission line, a spacer is used to prevent the conductor interval from becoming narrow, and a coil-shaped spring is used as the spacer.

As described above, by using a spacer in which the spring constant of the coiled spring of the spacer using the coiled spring is reduced, the coiled spring bends to allow twisting of the electric wire when icing and snow occurs on the electric wire. Therefore, the icing and snow of the electric wire does not develop in a wing shape, so that galloping hardly occurs.

In addition, the overhead transmission line in which the spacer as described above is attached near the center of the span can prevent a plurality of wires constituting one phase from being attracted to each other by electromagnetic force, and can be located near both ends of the span. Although wing-like icing and snow may occur on the electric wire at the center, wing-like icing and snow of the electric wire does not occur near the center, so that uniform lift is not generated in the longitudinal direction of the electric wire and galloping occurs. It becomes difficult.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show an overhead transmission line spacer according to an embodiment of the present invention, in which 11 is a coil spring, and 12 are electric wire gripping portions provided at both ends thereof.

As the coiled spring 11, a spring having a small spring constant enough to be bent by icing and snow of the electric wire, for example, a spring having a spring constant of about 0.3 to 3 kgf / mm is used.

Although the structure of the electric wire gripper 12 is not particularly limited, a so-called armor grip type electric wire gripper is used in this embodiment. That is, the wire gripping portion 12 has a gripping portion main body 15 in which a substantially inverted U-shaped core metal 13 is covered with a rubber-like elastic body 14, and a coil-shaped spring mounting portion 16 formed integrally with the core metal 13. The mounting portion 16 is attached to the coil spring 11 by screwing the mounting portion 16 into the end of the coil spring 11. In the drawing, reference numeral 17 denotes a flange formed at the base of the coil-shaped spring mounting portion 16, and reference numeral 18 denotes a projection for positioning an armor rod formed on the outer surface of the rubber-like elastic body.

The wire gripper 12 is attached to the wire 19 by attaching the gripper body 15 to the outer surface of the gripper body 15 and the wires 19 on both sides thereof. It is attached to.

As shown in FIG. 3 or FIG. 4, the wire gripping portion 12 includes a gripping portion main body 15 and a coil spring attaching portion.
It is also possible to use a member provided with a movable portion 21 rotatable in a horizontal plane between the movable portion 21 and the movable member 16. When such a movable portion 21 is provided, the stress of the coil spring 11 when the electric wire 19 moves in the line direction can be remarkably reduced. In the spacer of FIG. 4, the coil-shaped spring mounting portion 16 is formed in a cap nut shape.

Next, with reference to FIG. 5, a description will be given of a galloping prevention operation when icing and snow occurs on the overhead transmission line 19 to which the spacer 22 having the above-described configuration is attached.

When the wind is blowing from the direction of arrow A, FIG.
As shown in FIG. 7, icing snow 23 is generated on the electric wire 19 on the windward side. Since the coiled spring 11 has a small spring constant and is easily bent, when the amount of icing snow 23 increases, the coiled spring 11 bends as shown in FIG. The wire 19 will be twisted. For this reason, new icing snow 23 occurs on the windward surface of the electric wire 19. The bending direction of the coil spring 11 may be reversed as shown in FIG. In this way, the surface of the electric wire 19 facing the windward side changes, so that the icing snow 23 of the electric wire 19 does not develop in a wing shape, so that galloping can be prevented.

When the spacer of the present invention is attached to an overhead power transmission line, the spacer of the present invention may be attached to all spans. However, as shown in FIG.
And a conventional spacer 24 may be attached near both ends of the span.

When the spacer of the present invention is attached near the center of the span in this way, the conductor spacing does not become narrow near the center of the span, and wing-like icing snow does not form on the electric wire 19 in the vicinity, The lift acting on the electric wire 19 is not uniform in the longitudinal direction, and the occurrence of galloping can be effectively prevented.

When a plurality of spacers are attached between the spans, reducing the spring constant of the coiled spring of the spacer from both ends of the span toward the center is also effective in preventing galloping.

[Effect of the invention]

As described above, in the overhead power transmission line spacer according to the present invention, the spring constant of the coil spring is reduced to such an extent that the coil spring is bent by the icing snow of the electric wire. Does not occur, so that galloping can be prevented from occurring.
Also, in the overhead power transmission line where the spacer as described above is attached near the center of the span, the conductor interval does not become narrow near the center of the span and wing-like icing snow occurs near both ends of the span. Even in such a case, since wing-like icing snow does not occur near the center of the span, the lift in the longitudinal direction of the electric wire is not uniform, and galloping can be prevented.

[Brief description of the drawings]

FIGS. 1 and 2 are a front view and a plan view showing an overhead transmission line spacer according to an embodiment of the present invention, and FIGS. 3 and 4 are other overhead transmission line spacers according to the present invention, respectively. FIGS. 5A to 5C are front views showing the embodiment, and FIGS. 5A to 5C are explanatory views showing a state when icing and snow occurs on the overhead transmission line to which the overhead transmission line spacer according to the present invention is attached. FIGS. FIG. 2 is a plan view showing an embodiment of the overhead transmission line according to the present invention. 11: coiled spring, 12: electric wire gripper, 15: gripper body, 19: electric wire, 20: armor rod, 22: spacer for overhead transmission line according to the present invention, 23: icing and snow.

Claims (2)

(57) [Scope of request for utility model registration] In an overhead power transmission line spacer in which electric wire gripping portions are provided at both ends of a coiled spring, the spring constant of the coiled spring is reduced to such an extent that the coiled spring is bent by icing and snow of the electric wire. A spacer for an overhead power transmission line, comprising: 2. The overhead transmission line spacer according to claim 1,
An overhead power transmission line, which is mounted near the center of the span.