JPS63290116A - Preventing method for galloping of horizontal plural conductor transmission line - Google Patents

Abstract

PURPOSE:To suppress a galloping by forming high and low difference which varies between spans of two conductors of a transmission line. CONSTITUTION:Two conductors 1a, 1b are horizontally disposed at a tension- insulator support 3, but vertically disposed to be supported at a suspension support 4. Thus, the two conductors 1a, 1b are twisted 90 deg. between the spans, and high and low difference is formed to be larger, the nearer they approach the support 4. In the case of the horizontal plural conductor transmission line, since the conductors 1a, 1b are disposed approximately vertically disposed near the support 4, a resisting force D is almost all, and a lift L is generated as they approach the support 3. As a result, the lift L given by wind W becomes irregular in a line direction so that the galloping scarcely occurs. Thus, it can prevent the galloping from occurring.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to horizontal double conductor transmission 'r! This invention relates to a method for preventing gear lopping of one line.

[Prior art and its problems]

The mechanism of gear lopping in a horizontal multi-conductor transmission line is that when ice forms on the side of the conductor and wind blows, the period of vertical vibration caused by the lifting force almost matches the period of torsional vibration of the transmission line. Develops into amplitude gearropping. That is what it is.

Therefore, conventionally, a gear ropping damper is attached to the power transmission line to control the torsional vibration period of the power transmission line so that it does not approach the vertical vibration period, thereby preventing the occurrence of gear roping.

However, the weight of each gearropping damper is 40
~IOQ Kg is also available, and installation is not only troublesome, but
Practically speaking, only gears with a period of about 1 to 5 seconds can be manufactured, so for example, it is suitable for long-period gearonoping, which occurs in a span where at least one end is supported by a suspension insulator, which involves the suspension insulator flowing in the direction of the track. had no effect. Furthermore, since installing a gear-ropping damper would increase the slack and tension of the power transmission line, it was not possible to install a gear-ropping damper on lines where there was not enough room on the tower.

[Means for solving problems and their effects]

The present invention provides a method for preventing gear romping in a horizontal multi-conductor transmission line, which solves the problems of the prior art as described above. It is characterized by creating height differences that change within the area.

In this way, the lift characteristics within the span become uneven in the track direction, and the occurrence of gear lopping can be suppressed without using a gear ropping damper.

〔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 which (al is a side view and (bl is a plan view), 1a and 1b are two conductors constituting a horizontal multi-conductor power transmission line; is 4 bodies 1a
・Spacer that maintains the spacing of 1b, 3 is the conductor 1a and 1b
A tensile support part 4 holds the conductors 1a and 1b to the steel tower, and 4 is a suspension support part that suspends the conductors 1a and 1b from the steel tower. Two conductors 1a/1
b is supported in a horizontal arrangement by the tensile support part 3,
The suspension support part 4 supports it in a vertical arrangement. For this reason, the two four bodies 1a and 1b are twisted by 90° within each span, creating a difference in height that increases as they approach the suspension support portion 4.

In a normal horizontal multi-conductor power transmission line, when the tension of the two conductors is the same, lifting force is generated by the upward wind W as shown in Figure 2, and the vector sum of the drag force causes conductor 1 to move in the direction C. Since this occurs almost uniformly over the entire length of the span, it becomes a large force and develops into gear roping.

However, in the case of a horizontal multi-conductor transmission line as shown in Fig. 1, the conductors 1a and 1b are arranged almost vertically near the suspension support part 4, as shown in Fig. 3, so most of the drag is caused by the tensile support part. As the value approaches 3, a lift force is generated. As a result, the lift force exerted by the wind becomes uneven in the track direction, making gear roping less likely to occur. Note that numeral 5 indicates icing.

FIG. 4(a) (bl shows another embodiment of the present invention. This method for preventing gear roping is performed by attaching a spacer 2 to one of the two conductors 1a and 1b near a point. By attaching the weight 6, the sag of one conductor 1b is made larger than that of the other conductor 1a, and a height difference that changes within the span is created between the conductors 1a and 1b.

Further, FIG. 5(a) (bl) shows still another embodiment of the present invention. This method for preventing gear roping is performed by connecting two conductors 1
Interrupt conductor 7 is connected to the end of one conductor 1b of a and 1b.
By connecting the conductors 1b and 1b, making the tension of one conductor 1b lower than the tension of the other conductor 1a, and suspending one conductor 1b from the other conductor 1a, the conductors 1a and 1b have a change in the span. It has different heights.

Even in the above manner, the same gear roping prevention effect as in the case of FIG. 1 can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, the two conductors constituting the horizontal multi-conductor transmission line are provided with a height difference that changes within the span, so that the lift characteristics within the span are uneven in the line direction. This prevents gear ropping from occurring. Therefore, it is not necessary to use a gear roping damper, which is economical, and is also suitable for power transmission lines where long-period gear lopping occurs, or for transmission lines where there is not enough room to install a gear roping damper on the tower. It is also possible to provide a gearropping prevention function.

[Brief explanation of drawings]

Fig. 1(a) (bl is a side view and a plan view showing a method for preventing gearropping in a horizontal multi-conductor power transmission line according to an embodiment of the present invention, and Fig. 2 is a mechanism of occurrence of gearropping in a horizontal multi-conductor power transmission line. FIG. 3 is an explanatory diagram of the gearropping prevention effect in the horizontal double conductor transmission line of FIG. 1, FIG. 4 is a side view and a plan view showing another embodiment of the present invention, FIG. 5 (al (bl) is a side view and a plan view showing still another embodiment of the present invention.
~Suspension support part, 5~Icing, 6~Weight, 7~Interrupt conductor. b (b)

Claims (4)

[Claims] (1) A method for preventing galloping in a horizontal multi-conductor power transmission line, characterized by providing two conductors constituting the horizontal multi-conductor power transmission line with a height difference that changes within a span. (2) The method according to claim 1, wherein the two conductors are supported horizontally at one support point of the span and vertically at the other support point, thereby changing the span within the span. Something with different heights. (3) The method according to claim 1, in which a weight is attached to one of the two conductors near the spacer attachment point to create a height difference that changes within the span. thing. (4) The method according to claim 1, wherein the tension of one of the two conductors is lower than the tension of the other conductor, thereby creating a height difference that changes within the span. Something.