JPS6142486B2 - - 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 protrusion length of the arm 2D can be significantly shortened, and the arm is made up of the upper arm 2A and the lower arm 2.
Since it only has D and 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. Area reduction 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 the case where the upper arm 2A and the lower arm 2D are tensilely connected by a series of long vertical jumper insulators 3 supporting a plurality of jumper conductors 4, the upper arm 2A and the lower arm 2D are Not only is the weight of the intermediate portions of the plurality of jumper conductors 4 and the weight of the long vertical jumper insulator chain 3 added,
When wind pressure acts in a direction that causes the jumper conductor 4 to sway laterally, a significantly large tension is applied to the series of vertical jumper insulators 3, and this tension is applied to the upper arm 2A.
Since the upper arm 2A and the lower arm 2D are required to have high strength to withstand the above-mentioned own weight and large bending moment, these arms 2A and 2D are It is necessary to make the steel tower large and strong, so the reality is that it is not possible to reduce the size of the entire steel tower to that extent.

Furthermore, in the jumper device according to the above proposal, the entire length of the jumper insulator chain 3 between the upper arm 2A and the lower arm 2D becomes extremely long. Differences in the overall length of the insulator strings tend to occur, and therefore, for example, if the overall length of the jumper insulator strings is shorter than the vertical distance between the upper and lower arms, the jumper insulator strings can be easily connected between the upper and lower arms. If the jumper insulator chain is longer than the vertical distance between the upper and lower arms and the overall length of the jumper insulator chain is longer than the vertical distance between the upper and lower arms, the jumper insulator chain is Significant sagging occurs in the jumper conductor, resulting in the inconvenience that the original objective effect of preventing the jumper conductor from rolling when wind pressure is applied cannot be achieved.

This invention was made in view of the above circumstances, and it is possible to achieve a practical advantage in downsizing the entire steel tower.Moreover, due to the difference between the vertical distance between the upper and lower arms and the overall length of the jumper insulator chain, It is an object of the present invention to provide a jumper device that can prevent the occurrence of various problems caused by the above problems.

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 the lower arm 2D are fixed and extended, and each pair of arms that are vertically adjacent to each other 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 turnbuckle mechanism 12 is provided for adjusting the overall length of 7'; 8, 8'.

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. Further, the upper end portions of the jumper insulator chains 7, 7' are rotatably attached 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. Therefore, the jumper insulator chains 7, 7' are configured to be universally rotatably attached to the upper arm 2A. In addition, at the connecting portion B between the lower end of the jumper insulator series 7, 7' and the upper end of the jumper insulator series 8, 8' and the intermediate part of the jumper conductor 4, the plurality of unit conductors 41 constituting the jumper conductor 4 are connected as a whole. Support pieces 16 and 16' are attached to the upper and lower parts of the annular frame 42 for holding the cylindrical arrangement, respectively, and the upper support pieces 16 and the lower ends of the upper insulator chains 7 and 7' are connected to each other. They are rotatably connected to each other by a shaft pin 17 parallel to the shaft pin 15, and the lower support piece 1
The upper ends of lower insulator chains 8, 8' are attached to 6', and upper and lower support pieces 16, 16' are interconnected by a tension member 18. Furthermore, at the connecting portion C between the lower ends of the jumper insulator chains 8, 8' and the intermediate arm 2B, the lower end of the turnbuckle mechanism 12 connected to the lower ends of the jumper insulator chains 8, 8' is aligned with the horizontal protrusion direction of the intermediate arm 2B. It is configured to be rotatably attached to the upper surface of the intermediate arm 2B via a parallel shaft pin 19. Of course, each connecting portion between the intermediate arms 2B and 2C and each connecting portion between the intermediate arm 2C and the lower arm 2D are similarly constructed.

The first aspect of the first invention shown in FIGS. 4 to 6
In the embodiment, jumper insulators 7, 7';
Since the connecting parts A, B, and C between the arms 2A to 2D and the jumper conductor 4 are rotatable, even if wind pressure is applied in a direction that causes the jumper conductor 4 to swing, the shock will not be applied. Each connecting part A,
It is possible to effectively prevent damage or fatigue caused by excessive force being applied to B and C.

Figure 7 shows the first construction of this application using the existing steel tower.
This is an example of carrying out the invention, that is, a second embodiment of the first invention, and shows the tips of the existing upper arm main body 21A and the existing intermediate arm main bodies 21B and 21C attached to the existing steel tower main body 1. are respectively attached with extension auxiliary arms 22A, 22B, and 22C extending in the extension direction thereof, thereby increasing the upper arm 2A, 22B, and 22C in the first embodiment.
Intermediate arms 2B and 2C are each constructed. In this second embodiment, the distal end portions of each of the extension auxiliary arms 22A, 22B, 22C are connected to the first
Upper arm 2A, intermediate arms 2B, 2C of the embodiment
Therefore, jumper insulator chains 7, 7'; 8, 8' are attached to the tips of these extension auxiliary arms 22A, 22B, 22C in the same manner as described above.

According to the second embodiment shown in FIG. 7, the present invention can be carried out by only slightly modifying the existing steel tower, so the existing steel tower can be effectively utilized and construction costs can be reduced.

In each embodiment of the first invention described above, the turnbuckle mechanism 12 is provided at the lower end of the lower jumper insulator series 8, 8', but it is not provided at the upper end of the upper jumper insulator series 7, 7'. Furthermore, it may be inserted in the intermediate portion of 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 turnbuckle 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.
Since they are much smaller than the conventional jumper device shown in the figure, the auxiliary arms 22A, 22B, 22C in the second embodiment 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. 8 is a side view showing an embodiment of the second invention of this application, and since the front view of FIG. 8 is substantially the same as 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 shape, similar to the jumper conductor 4 of the above-mentioned embodiment of the first invention.) The rigid jumper portion 4A of the jumper conductor 4 is located between the tips of each pair of vertically adjacent arms, for example, the upper arm 2A.
and the distal ends of the intermediate arm 2B so as to extend in the horizontal direction. and upper arm 2
The tip of A and the vicinity of one longitudinal end (left end in FIG. 8) and the vicinity of the other end (also right end) of the rigid jumper section 4A located below it,
Connected via a first jumper insulator series 7A on the left and a second jumper insulator series 7A' on the right side, which extend in the vertical direction and are respectively inclined to form an inverted V shape in a vertical plane extending in the width direction of the arm 2A. In addition, the intermediate arm 2B located near one end in the length direction of the rigid jumper portion 4A, near the other end, and below the intermediate arm 2B
A third jumper insulator chain 8A on the left side and a fourth jumper insulator chain on the right side extend in the vertical direction and are respectively inclined to form a V-shape in a vertical plane extending in the width direction.
Connected via jumper insulator 8A',
Turnbuckle mechanisms 12 are provided at the lower ends of the third jumper insulator chain 8A and the fourth jumper insulator chain 8A', respectively, for adjusting their lengths. Further, the structure between the intermediate arms 2B and 2C and between the intermediate arm 2C and the lower arm 2D is 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 7 supporting the rigid jumper portion 4A
A, 7A'; 8A, 8A' are rigid jumper parts 4A
is fixed to each of the arms 2A to 2D at a position outside the main line tension insulator chain 9 so as to project outward from the main line tension position.

In this second invention as well, the turnbuckle mechanism 12 may be provided at the upper end of the first jumper insulator chain 7A and the upper end of the second jumper insulator chain 7A'.
The middle position or lower end of jumper insulator chain 7A',
Alternatively, it may be provided at an intermediate position or at the upper end of the third jumper insulator chain 8A and the fourth jumper insulator chain 8A'.

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 fixedly supported by a jumper insulator chain that extends in the vertical direction and is interposed between vertically adjacent arms, the jumper conductor is almost completely prevented from sagging due to wind pressure. In addition, since the jumper insulator chain is divided into multiple subspan lengths by the presence of an intermediate arm, the tension that acts on the entire jumper insulator chain from the upper arm to the lower arm due to wind pressure is transferred to the intermediate arm. This reduces the bending moment applied to each arm by distributing it to the length of each subspan divided by the existence of the bridge, making it possible to reduce the size and weight of each arm and actually reduce the size of the entire tower. In addition, the jumper insulators interposed between the vertically adjacent arms are equipped with a turnbuckle mechanism to adjust their length, so there is a difference in the spacing between the upper and lower arms and the length of the jumper insulators. Even if this occurs, the length of the jumper insulator chain can be easily adjusted using a turnbuckle mechanism. For example, if the length of the jumper insulator chain is shorter than the vertical distance between the upper and lower arms, the length of the jumper insulator chain can be easily adjusted. By adjusting to extend the overall length, the jumper insulator chain can be easily interposed and connected between the upper and lower arms, and conversely, if the length of the jumper insulator chain is longer than the vertical distance between the upper and lower arms. By adjusting the overall length of the jumper insulator run to shorten it, the slack in the jumper insulator run can be easily removed, thus keeping the jumper insulator run in a proper condition at all times. The effect that can be obtained can be obtained.

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 vicinity of both longitudinal ends of the rigid jumper part, the upper arm and the lower arm thereof, The jumper conductors are connected by inverted V-shaped jumper insulators and V-shaped jumper insulators, respectively, forming a more preferable framework structure. This allows for more secure and firm fixed support to prevent rotation.

[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 front view showing a second embodiment of the first invention of this application, and FIG. 8 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 turnbuckle Mechanism, 7
A, 7A'; 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 protruded from the top of the tower body in order from above, and between each vertically adjacent arm there is a jumper extending horizontally. The intermediate portions of the conductors are arranged, and the vertically adjacent arms and the intermediate portions of the jumper conductors located therebetween are interconnected by jumper insulators interposed between the arms and extending in the vertical direction. . A jumper device for a power transmission line, further comprising: a turnbuckle mechanism provided on the jumper insulator chain; and an end portion of each jumper conductor being electrically connected to a corresponding main line. 2 An upper arm, an appropriate number of intermediate arms, and a lower arm are fixed to the tower body in order from above, 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 one of the group consisting of the first jumper insulator and the second jumper insulator and the group consisting of the third and fourth jumper insulator has a turnbuckle mechanism. 1. A jumper device for a power transmission line, wherein the end portions of each of the rigid jumper portions are electrically connected to the corresponding main lines via respective flexible jumper portions.