JP2594939Y2 - Grounding bracket for jumper device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding fitting for a jumper device used for performing grounding work on a tension tower of an overhead transmission line.

[0002]

2. Description of the Related Art A UHV jumper apparatus mainly comprises a pipe conductor (11 in FIG. 3) for connecting jumper wires, and a ground spacer 4 is attached between the pipe conductors, and a ground fitting 1 is attached to this spacer. As shown in FIG. 3, this grounding metal fitting 1 is formed by bending a metal rod having a round cross section to form a clamp mounting tool 2, and a base metal fitting 3 is joined to both downwardly bent ends of the mounting tool and the metal fitting 3 is grounded. Although the bolts are fixed to the spacers 4, this kind of conventional grounding metal has a considerably large bending radius R at each corner of the clamp mounting tool , and a corner angle (θ in FIG. 5) of 90 ° or less. There were many things.

[0003]

As shown in FIG. 4, the grounding operation of the jumper device is performed by attaching a grounding clamp 7 to the tip of a grounding wire 6 connected to a steel tower 9 using a grounding clamp 5, and attaching the clamp to the tower. A method is adopted in which the upper worker attaches the grounding bracket 1 attached to the jumper device 10 using the operation rod 8.

However, since the operating rod 8 has a total length of about 15 m, it is bent by the weight of the grounding clamp (the amount of bending is about 2 to 2).
3m), which causes shaking and makes it difficult to stabilize the position of the grounding clamp.

On the other hand, the grounding clamp has a width of about 45 mm , whereas the conventional grounding bracket has a large bending radius ( eg, 65 mm ) at the corner of the clamp fixture , and also has a corner angle of 90 ° or less. Therefore, the grounding clamp is difficult to attach. Therefore, may not adhere easily collected to the grounding member 1 ground clamp 7 control rod tip and side slip, even fits outside the fitting and the ground clamp 7 under the influence of curvature as shown in FIG. 5 between the grounding member 1 There is a problem that the gap g is generated and the grounding is not properly performed.

[0006] As shown in FIG. 6, on the inner curve side of the angle tower, a jumper device 1 hung on the end of the insulator 12.
Since the distance L between 0 and the tower body was as close as 5 m, the mounting work of the grounding clamp was particularly difficult.

[0007] The present invention aims to provide a grounding fitting which can be easily attached with a grounding clamp for more efficient grounding work.

[0008]

Means for Solving the Problems The grounding bracket of the present invention is:
In order to solve the above-mentioned problem, a clamp fitting made of a metal rod having a round cross section is bent in a U shape in a horizontal plane.
The turn part has a corner angle of almost 90 ° in plan view.
First and second corners are formed, and the first and second corners are fixed to the base bracket.
Ends of the metal bar to be bent downward from the first corner
Also has a third corner on one end side and a third corner on the other end side than the second corner.
Four corners are formed, and the third and fourth corners are
This clamp has a shape that the corner angles are almost 90 °.
Between the first corner and the third corner of the fixture and between the second corner and the
The length between the four corners is longer than the width of the grounding clamp.
To create a long straight clamp mount, and
Make the bending radius of each of the first to fourth corners as small as possible
Standing from the straight section between the first and second corners and the third and fourth corners
Grounding fitting with a drop-down part attached to the clamp attachment part
The stopper serves as a lateral displacement prevention stopper.

[0009]

[Function] In plan view of the first and second corners of the clamp fixture .
When the corner angles of the third and fourth corners and the third and fourth corners are set to approximately 90 °, the grounding clamps make proper contact with the corners of each corner, and further lateral displacement is prevented. Also, a straight clamp mounting portion between the first corner and the third corner.
Also , if the length of the straight clamp mounting portion between the second corner and the fourth corner is lengthened, the allowable amount of lateral displacement of the grounding clamp attached thereto increases, so that the grounding clamp can be laterally displaced even if the operation rod is shaken. It is difficult, and even if it deviates, if it is within the allowable range, it is securely attached to the grounding bracket. Also,
Since the corner R is small, there is no gap between the grounding clamp and the clamp fixture, and no grounding failure occurs.

[0010]

FIG. 1 shows an embodiment of the present invention.

[0011] As Figure, the ground fitting 20 is comprised of a clamp fixture 21 and the base fitting 22. Clamp fixture 2
Reference numeral 1 denotes a metal rod having a round cross section bent twice by 90 ° so as to form a first corner 21a and a second corner 21b, and further bent at both ends downward so as to form a third corner 21c and a fourth corner 21d. It is made. Each of the first and second corners 21a and 21b has a corner angle of 90 °. The corner angles of the third and fourth corners are also 90 ° in side view. Further, the bending radius of each corner is made as small as possible, and the length of the straight clamp mounting portion 21e between the first and third corners and between the second and fourth corners is sufficiently ensured.

[0012] The base bracket 22 showed that support collectively both ends of the clamp fixture may be fitting as shown in FIG. 3 that support both ends separately.

As shown in FIG. 2, the grounding bracket 20 is fixed to the grounding spacer 4, and the grounding clamp 7 is attached to two parallel straight portions 21e. In this way, the straight portion between the first and second corners or the falling portion from the third and fourth corners serves as a stopper to prevent the lateral displacement of the grounding clamp 7, and furthermore, as can be seen from the figure, Contact
Of the clamp mounting portion 21e , which is straighter than the width of the ground clamp 7 ,
Since the length is long enough, it can be installed well even if the grounding clamp slightly shifts.

[0014]

[Effect of the Invention] As described above, the grounding metal fitting of the present invention is provided with the first and second corners of the clamp mounting tool in plan view.
The corner angle and the corner angle in the side view of the third and fourth corners are set to approximately 90 °, and furthermore, the bending radius of each corner is made as small as possible , so that the corner portion has an effect of preventing lateral displacement and the ground contact The first and third corners of the clamp
2. Since the length of the straight clamp mounting portion between the fourth and fourth corners is made sufficiently large, mounting of the grounding clamp becomes easy,
Grounding failure is also eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a grounding bracket of the present invention.

FIG. 2 is a perspective view showing a state where the grounding metal fitting of FIG. 1 is attached to a grounding spacer.

FIG. 3 is a perspective view showing an example of a conventional grounding fitting.

FIG. 4 is a diagram showing an outline of a grounding operation of a jumper device.

FIG. 5 is a diagram showing a defective mounting state of a grounding clamp.

FIG. 6 is a plan view showing a positional relationship between a tower body and a jumper device in the angle steel tower.

[Explanation of symbols]

1,20 grounding member 2, 21 clamp fixture 3,22 base metal fitting 4 ground spacer 5 earth clamp 6 ground wire 7 ground clamp 8 operating rod 9 tower 10 Jumper 11 pipe conductor 12 insulator 21a first corner 21b second corner 21c Third corner 21d Fourth corner 21e Straight clamp mounting part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-144315 (JP, A) JP-A-62-213081 (JP, A) JP-A-63-1315 (JP, A) 90895 (JP, U) Japanese Utility Model 60-60860 (JP, U) Japanese Utility Model 60-60860 (JP, U) Japanese Utility Model 64-12433 (JP, U) Japanese Utility Model 49-157 (JP, Y1) (58) Field surveyed (Int.Cl. ⁶ , DB name) H02G 7/00-7/22

Claims (1)

(57) [Scope of request for utility model registration] (1) It is made of a metal base and a metal rod having a round cross section.
Clamp mounting fixture, fixing the base fitting to the ground spacer attached to the pipe conductor of the jumper device,
In grounding metal which are to be attached to electrically tethered grounded clamped against tower above Symbol clamp fixture, the clamping fixture, the metal rod in the horizontal plane co
It is bent into a letter shape, and the corners of the turn part in plan view are both
The first and second corners of approximately 90 ° are generated, and the base
Both ends of the metal bar fixed to the bracket are bent downward and
The third corner is closer to one end than the first corner, and the third corner is closer to the second corner
A fourth corner is formed on the other end side, and the third and fourth corners are
The shape is such that the corner angle in side view is almost 90 °.
Between the first and third corners of the clamp fixture and the second
Between the grounding clamp and the fourth corner
Produces a sufficiently long straight clamp mount,
In addition, the bending radius of each of the first to fourth corners should be as small as possible.
Thus, the straight portion between the first and second corners and the third and fourth corners
The falling part from the is attached to the clamp mounting part
A grounding metal fitting for a jumper device, which serves as a stopper for preventing lateral movement of the grounding metal.