JPS6142487B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission line jumper device particularly suitable for ultra-high voltage power transmission lines.

Conventionally, as a jumper device for a power transmission line whose main purpose is to downsize the entire steel tower, an upper arm 2A that is fixed to the side surface of the tower main body 1, as shown in FIGS. 1 to 3, has been used. and lower arm 2
Intermediate portions of a plurality of jumper conductors 4 extending substantially horizontally in the same vertical plane between the tips of D are interconnected by vertical jumper insulator chains 3 arranged on the same vertical line in the same vertical plane. Furthermore, the ends of each jumper conductor 4 corresponding to the main line 10 connected to the tower main body 1 through a tensile insulator chain 9 are electrically connected through a retaining clamp 11 (Japanese Patent Application Laid-open No. No. 150892) has been proposed. In this proposal, the intermediate portions of the plurality of jumper conductors 4 are interconnected by the vertical jumper insulator chain 3 disposed between the tips of the upper arm 2A and the lower arm 2D.
It is possible to almost completely prevent horizontal swing of the jumper conductors 4, and therefore maintain the distance L between each jumper conductor 4 and the tower main body 1 at the required minimum insulation interval. The protruding length of the arm 2D can be significantly shortened, and the arms are the upper arm 2A and the lower arm 2D.
Since there is no intermediate arm, the distance between both arms 2A and 2D is only the length of the vertical jumper insulator chain 3 having the required leakage length, and the height of the steel tower is made as low as possible. Therefore, the height of the tower body 1 and its cross-sectional area are reduced, and each arm 2
It is stated that by reducing the lengths of A and 2D and their cross-sectional areas, the entire steel tower can be made three-dimensionally smaller. However, as in the above proposal, the arms are divided into upper arm 2A and lower arm 2D.
In this case, the upper arms 2A and 2D are connected by a series of long vertical jumper insulators 3 that support a plurality of jumper conductors 4.
When not only the weight of the middle part of the jumper conductor 4 and the weight of the long vertical jumper insulator chain 3 are applied, but also wind pressure in a direction that causes the jumper conductor 4 to sway laterally, a significantly large tension is applied to the series of vertical jumper insulator chains 3. Since this tension acts as a large bending moment on the upper arm 2A and the lower arm 2D, the upper arm 2A and the lower arm 2D
It is required that the arms 2A and 2D be large and strong enough to withstand the above-mentioned own weight and large bending moment, and therefore, in reality, the entire steel tower cannot be reduced in size. The reality is that it cannot be reduced.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a jumper device that can practically advantageously reduce the size of the entire steel tower.

Embodiments of this invention will be described below with reference to FIGS. 4 to 8.
To explain in detail with reference to the drawings, FIGS. 4 to 6 show a first embodiment of the first invention of this application, in which upper arms are arranged on the side surface of the tower main body 1 in order from the top. 2A, appropriate number of intermediate arms 2
B, 2C and a lower arm 2D are extended and fixed, and each pair of vertically adjacent arms in these arms 2A to 2D, for example, the upper arm 2A
And between the tips of the intermediate arms 2B, there are a plurality of unit conductors (elementary conductors) 41 (see FIG. 6), which extend almost horizontally and are ordinary flexible twisted wires, when viewed in parallel and in the cross-sectional direction. A middle portion of jumper conductors 4 arranged in a cylindrical shape as a whole is arranged. The tip of the upper arm 2A and the jumper conductor 4 located below it are connected by a pair of vertical jumper insulators 7, 7' extending in the vertical direction, and the jumper conductor 4 and the jumper conductor 4 are The tips of the intermediate arm 2B located on the lower side are also connected by a pair of vertical jumper insulators 8, 8' extending in the vertical direction. And again intermediate arm 2
The structure between B and 2C and between the intermediate arm 2C and the lower arm 2D is similar to the above structure,
Therefore, vertical jumper insulator chains 7, 7' extending in the vertical direction are interposed between the tips of each pair of vertically adjacent arms and the intermediate portion of the jumper conductor 4 therebetween; 8 and 8'. The end of each jumper conductor 4 is electrically connected via a retaining clamp 11 to each corresponding main line 10 which is connected to the tower main body 1 via a tension insulator link 9, respectively. Here, the jumper insulator chains 7, 7'; 8, 8' supporting each jumper conductor 4 are connected to the jumper conductor 4.
It is fixed to each of the arms 2A to 2D at a position outside the main wire tension insulator chain 9 so that the intermediate portion thereof extends beyond the tension positions at both ends thereof.

Furthermore, each pair of vertically adjacent arms (for example, the upper arm 2A and the intermediate arm 2B)
Between the jumper insulators 7, 7'; 8, 8', the lower ends of the jumper insulators 7, 8' are
A coil spring is provided as a tension adjustment mechanism 12 for adjusting the tension of the entire assembly 7'; 8, 8' in use, that is, the tension in the installed state.

Here, each jumper insulator series 7, 7'; 8,
8' and each arm 2A to 2D and jumper conductor 4
To explain in more detail the structure of the connecting portion between the upper arm 2A and the intermediate arm 2B, the connection between the jumper insulator series 7, 7' and the upper arm 2A will be explained in more detail. In part A, as shown in FIG. 6, an intermediate connecting piece 14 is rotatably attached to the lower surface side of the upper arm 2A via a shaft pin 13 parallel to the horizontal protrusion direction of the upper arm 2A. A jumper insulator chain 7 is connected to the lower part of the intermediate connecting piece 14 via a second shaft pin 15 which is perpendicular to the axial direction of the shaft pin 13 and horizontal.
7' is rotatably attached to the upper end of the jumper insulator chain 7, 7'.
It is configured to be universally rotatably attached to A. Also Jiyampa insulator series 7, 7'
At the connection part B between the lower part of the jumper insulator chain 8, 8' and the middle part of the jumper conductor 4, there is a groove for holding the plurality of unit conductors 41 constituting the jumper conductor 4 arranged in a cylindrical shape as a whole. Support pieces 16 and 16' are attached to the upper and lower parts of the annular frame 42, respectively, and the distance between the upper support piece 16 and the lower ends of the upper insulator chains 7 and 7' is parallel to the shaft pin 15. They are rotatably connected to each other by a shaft pin 17, and the upper ends of the lower insulator chains 8, 8' are attached to the lower support piece 16'.
Furthermore, the upper and lower support pieces 16, 16' are interconnected by a tension member 18. Furthermore, the lower end of jumper insulator series 8, 8' and intermediate arm 2B
In the connection part C with the jumper insulator 8,
The lower end of the tension adjustment mechanism 8', that is, the coil spring 12, is rotatably attached to the upper surface of the intermediate arm 2B via a shaft pin 19 parallel to the horizontal protruding direction of the intermediate arm 2B. It's summery. Of course, intermediate arms 2B and 2C
The connecting portions between the intermediate arm 2C and the lower arm 2D are similarly configured.

In the first embodiment of the first invention shown in FIGS. 4 to 6, when high wind pressure is applied to the jumper conductor 4, the spring 12 provided as a tension adjustment mechanism expands and the jumper insulator chain is expanded. 7, 7'; The tension applied to 8, 8' is transferred to the spring 12.
As a result, Jiyampa Insulators 7,
7'; 8, 8' can be prevented from being damaged. Furthermore, since the connecting parts A, B, and C between the jumper insulator chains 7, 7'; 8, 8', each of the arms 2A to 2D, and the jumper conductor 4 are rotatable,
Even if wind pressure is applied in the direction of swinging the jumper conductor, it is possible to effectively prevent fatigue or damage due to excessive force being applied to each connecting portion due to the impact.

FIG. 7 shows another specific example of the tension adjustment mechanism 12, in which a flexible filament of a predetermined length, such as a wire rope, is attached to the lower end of the jumper insulator series 8, 8'. Weight 12 via body 12A
B is suspended, and the flexible filament 12A is
A support piece 1 provided at the tip of the lower arm, for example, the intermediate arm 2B, of the jumper insulator series 8, 8'.
The vertical through hole 12D of 2C is inserted into the through hole 12D.

When the tension adjustment mechanism 12 shown in FIG. 7 is used, even if high wind pressure is applied to the jumper conductor 4, the tension in the jumper insulator chains 7, 7'; 8, 8' hardly changes. This can effectively prevent the jumper insulator chains 7, 7'; 8, 8' from being damaged due to an increase in the amount of damage. In the example shown in Fig. 7, the weight 12B is suspended by its own weight, so even if the spacing between the upper and lower arms and the length of the jumper insulator chain vary due to construction errors, installation problems may occur. Therefore, installation and assembly work is extremely easy. Furthermore,
Of course, in the example of FIG. 7, the vertical through hole 12D may be formed directly at the tip of the arm, for example, the intermediate arm 2B.

Figure 8 shows the first construction of this application using the existing steel tower.
This shows an example of carrying out the invention, that is, a second embodiment of the first invention, in which an existing upper arm main body 21A attached to an existing steel tower main body 1 is used.
Extension auxiliary arms 22A, 22B, and 22C are attached to the tips of the existing intermediate arm bodies 21B and 21C, respectively, extending in the respective extension directions.
Intermediate arms 2B and 2C are formed, respectively. In this second embodiment, the tips of the extension auxiliary arms 22A, 22B, 22C become the tips of the upper arm 2A, intermediate arms 2B, 2C, so the tips of the extension auxiliary arms 22A, 22C are In the same way, each jumper insulator 7,
7'; 8, 8' are attached.

According to the second embodiment shown in FIG. 8, the present invention can be carried out by only making slight modifications to the existing steel tower, so the existing steel tower can be effectively utilized and construction costs can be reduced.

In addition, in the above first invention, when the tension adjustment mechanism 12 is constituted by a spring,
The tension adjustment mechanism 12 includes an upper jumper insulator chain 7,
It may be provided at the upper end or lower end of the jumper insulator series 7' or at the upper end of the lower jumper insulator series 8, 8', or it may be inserted at an intermediate position between the jumper insulator series 7, 7' or 8, 8'.

Further, in each of the above embodiments, in order to support the jumper conductor 4 between each pair of vertically adjacent arms, a total of four jumper insulator chains 7, 7'; However, the number of these insulators may be increased or decreased as appropriate. That is, for example, the upper arm 2A and the jumper conductor 4 below it.
The jumper conductor 4 and the lower intermediate arm 2B are connected by one jumper insulator chain, and the jumper conductor 4 and the lower intermediate arm 2B are supported by one jumper insulator chain, and between the other arms. may also be configured in the same way. In that case, the tension adjustment mechanism 12 may be provided on either one of the upper and lower insulator chains between each pair of arms.

Furthermore, as will be described later, in this invention, the jumper insulator chain 7, between each arm is caused by wind pressure.
7'; The tension acting on 8, 8' is shown in Figures 1 to 3.
The auxiliary arms 22A, 22B, 22C in the second embodiment shown in FIG. 8 are not required to have great strength because they are much smaller than the conventional jumper device shown in FIG. The arms 22A, 22B, and 22C are not limited to those made of steel, and for example, rigid insulators may also be used.

FIG. 9 is a side view showing an embodiment of the second invention of this application, and since the front view of FIG. 9 is already the same as that of FIG. 4, it will be omitted. In this second invention, the jumper conductor 4 in the first invention described above has a rigid jumper part 4A made of a highly conductive rod-shaped rigid body such as an aluminum pipe, an aluminum rod, an aluminum channel, etc., and a normal jumper part 4A at both ends thereof. Flexible jumper section 4B made of flexible twisted wires
(However, in the case of an ultra-high voltage power transmission line, it is preferable to use a multi-conductor structure in which flexible unit conductors are arranged in parallel in a ring, similar to the jumper conductor 4 in the embodiment of the first invention described above.) The rigid jumper portion 4A of the jumper conductor 4 is arranged between the tips of each pair of vertically adjacent arms, for example, the upper arm 2.
A and the distal end portions of the intermediate arm 2B so as to extend in the horizontal direction. The distal end of the upper arm 2A and the vicinity of one longitudinal end (the left end in FIG. 9) and the vicinity of the other end (also the right end) of the rigid jumper section 4A located below the distal end of the arm 2A. The first jumper insulator series 7A on the left side extending in the vertical direction are arranged at an angle so as to form an inverted V shape in a vertical plane extending in the width direction.
and an intermediate arm 2B which is connected via a second jumper insulator chain 7A' on the right side, and which is located near one end in the length direction of the rigid jumper part 4A, near the other end, and below the rigid jumper part 4A. Through the third jumper insulator series 8A on the left side and the fourth jumper insulator series 8A' on the right side, each of which extends in the vertical direction and is inclined so as to form a V shape in a vertical plane extending in the width direction of the intermediate arm 2B. The lower ends of the third jumper insulator chain 8A and the fourth jumper insulator chain 8A' are connected to each other as a tension adjustment mechanism 12 for adjusting the tension when each is used. The mechanisms shown are provided. Also, intermediate arm 2B,
Between 2C and intermediate arm 2C and lower arm 2D
The structure between the two is also similar to the above structure. The flexible jumper portion 4B extending from the end of each rigid jumper portion 4A is connected to each corresponding main line 10, which is connected to the tower main body 1 via a tensile insulator link 9, via a retaining clamp 11. electrically connected. Here, each of the insulator chains 7A, 7A'; 8A, 8A' supporting the rigid jumper part 4A is connected to the tension-resistant insulator chain 9 for main line tensioning so that the rigid jumper part 4A is pulled outward from the main line tensioning position. is also fixed to each arm 2A to 2D at an outer position.

Note that also in this second invention, the tension adjustment mechanism 12 is connected to the upper end of the first jumper insulator chain 7A and the second
It may be provided at the upper end of the jumper insulator series 7A', or at the intermediate position or lower end of the first jumper insulator series 7A and the second jumper insulator series 7A', or at the third jumper insulator series 8A and the fourth jumper insulator series 8A'. It may be provided at an intermediate position or at the upper end.

Furthermore, also in the second invention, each arm 2A
〜2D and the vicinity of the end of the rigid jumper portion 4A and the connecting portions of the jumper insulator chains 7A, 7A'; 8A, 8A' are mutually rotatable as in the example of FIG. 6 in the first invention. It is desirable to configure the

According to the first invention of this application, an intermediate arm is present between an upper arm and a lower arm, and an intermediate portion of each jumper conductor extending horizontally is arranged between each vertically adjacent arm, and Since the intermediate portion of the jumper conductor is connected and supported by a jumper insulator chain that extends in the vertical direction and is interposed between vertically adjacent arms, it is possible to almost completely prevent the jumper conductor from lateral shaking due to wind pressure. Since the length of the jumper insulator chain is divided by tension between each vertically adjacent arm, the tension that acts on the jumper insulator chain as a whole from the upper arm to the lower arm due to wind pressure is applied to the jumper insulator chain between each arm. As a result, the bending moment applied to each arm is reduced, making it possible to reduce the size and weight of each arm and actually downsizing the tower as a whole. Since each jumper insulator chain that supports each gap is equipped with a tension adjustment mechanism, the tension of each jumper insulator chain will hardly increase even if large wind pressure is applied, and therefore the jumper insulator chain will not be under excessive tension. This has the effect of reliably preventing damage to the jumper insulators from damage due to impact forces, etc., or breakage of the mounting parts, and ensuring that each jumper insulator chain is always tensioned and maintained at an appropriate tension state. It is something that can be done.

Further, according to the second invention of this application, the intermediate part of the jumper conductor is constituted by a rigid jumper part, and the distance between the vicinity of both lengthwise ends of the rigid jumper part and the upper arm is respectively Since they are connected by inverted V-shaped and V-shaped jumper insulators, a more preferable framework structure is constructed.
Effects such as being able to more reliably and firmly fix and support the jumper conductor so as to prevent it from rolling or rotating within a horizontal plane with respect to its center position as a reference can be obtained.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a conventional jumper device for power transmission lines, in which Figure 1 is a partially omitted perspective view, Figure 2 is a side view, and Figure 3 is a partially front view. be. FIG. 4 is a front view showing the first embodiment of the first invention of this application, FIG. 5 is a side view of the same embodiment, and FIG. 6 is an enlarged front view of main parts of the same embodiment.
FIG. 7 is a partially cutaway front view showing another specific example of the tension adjustment mechanism used in each invention of this application, and FIG. 8 is a front view showing a second embodiment of the first invention of this application. FIG. 9 is a side view showing an embodiment of the second invention of this application. In the figure, 1 is the tower body, 2A is the upper arm, 2B,
2C is the intermediate arm, 2D is the lower arm, 4 is the jumper conductor, 4A is the rigid jumper part, 4B is the flexible jumper part, 7, 7', 8, 8' are the jumper insulator series, 10 is the main line, 12 is the tension Adjustment mechanism, 7A, 7
A', 8A, and 8A' indicate the first, second, third, and fourth jumper insulator series in that order.

Claims (1)

[Claims] 1. An upper arm, an appropriate number of intermediate arms, and a lower arm are fixed and overhanging from the top of the tower body, and jumper conductors extending in the horizontal direction are provided between each vertically adjacent arm. , and each of the vertically adjacent arms and the intermediate part of the jumper conductor located therebetween are interconnected by a jumper insulator chain extending in the vertical direction interposed between the arms, Furthermore, the jumper insulator chain is provided with a tension adjustment mechanism for adjusting the tension during use, and each end of the jumper conductor is electrically connected to the corresponding main wire. Jumper device for power transmission lines. 2. An upper arm, an appropriate number of intermediate arms, and a lower arm are fixed to the tower body in order from the top, and a rigid jumper section extending horizontally is provided between each pair of vertically adjacent arms. The upper arm and the lower rigid jumper part of each pair of vertically adjacent arms have a width near one end and the other end in the length direction of the upper arm and the lower rigid jumper part. are connected by a first jumper insulator series and a second jumper insulator series that are inclinedly arranged in an inverted V shape within a vertical plane extending in the direction, and the lower arm of each pair of arms and its upper rigidity. The vicinity of one end and the vicinity of the other end in the longitudinal direction of the jumper part are connected by a third jumper insulator series and a fourth jumper insulator series that are inclined in a V-shape in the vertical plane. Further, each jumper insulator of either one of the group consisting of the first jumper insulator and the second jumper insulator and the group consisting of the fourth jumper insulator has a tension at the time of use. A tension adjustment mechanism is provided to adjust the
The jumper device for a power transmission line is further characterized in that the end portions of each of the rigid jumper portions are electrically connected to the corresponding main lines via respective flexible jumper portions.