JP2000236613A - Jumper device for overhead transmission line and system dividing method for the overhead transmission line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a system dividing work, which is performed for opening a jumper device when an electrical accident occurs in a transmission and distribution system, carried out easily and quickly. SOLUTION: In this device, a jumper device 11 electrically connects transmission lines 2 anchored to the steel crossarm 1 of a steel tower via anchor clamps 3 and tension insulator strings 6 on both sides of the steel tower to each other via a jumper conductor 15, both ends of which are electrically connected to the anchor clamps 3, the jumper conductor 15 is divided into two parts at its middle section and the halved jumper conductors 15a and 15b are electrically connected to each other via an attaching/detaching clamp 16, to which at least one of the conductors 15a and 15b can be attached detachably. Since system dividing work can be carried out immediately below the steel crossarm 1, a worker can easily, efficiently, and quickly carry out the work in a reasonable posture. In addition, the workability of the system dividing work is improved, because the work can be carried out at one location. Moreover, this method can also be applied easily to existing overhead transmission lines.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jumper device for an overhead transmission line and a method for disconnecting the overhead transmission line, which can easily disconnect the system in the event of an electrical accident in a transmission and distribution system.

[0002]

2. Description of the Related Art FIG. 10 shows a conventional jumper device 7 for an overhead power transmission line, in which 1 is an arm of a tower, 2 is a transmission line (main line), 3 is a clamping clamp, 4 is a jumper socket, and 5 is a jumper. The conductor 6 is a tension insulator series. The transmission line 2 is fixed to the arm 1 of the tower via an anchoring clamp 3 and a tension insulator 6 fixed to the end. Jumper conductor 5
, A jumper socket 4 fixed at both ends thereof is bolted to the clamp 3 to electrically connect the transmission lines 2 on both sides of the tower.

[0003] By the way, a power outage accident in the transmission and distribution system,
When an electrical accident such as a grounding accident or an induction accident occurs, the system is disconnected by opening a jumper device of the overhead transmission line in order to limit the range affected by the accident. For example, in the case of an overhead transmission line of about 66 kV, the distance L from the arm clamp 1 to the retaining clamp 3 is, for example, 1.0 to 1.2.
m, and the vertical distance H from the center of the arm 1 at the center of the jumper conductor 5 is about 1.0 to 1.5 m. However, it is necessary to perform system disconnection in such a jumper device due to the electric accident or the like. In the conventional case, the bolt of the jumper socket 4 bolted to the clamp 3 is removed,
The jumper socket 4 is detached from the clamp 3 and the jumper device 7 is opened to perform a system disconnection operation. Also,
When reconnecting, connect the jumper socket 4 to the clamp 3
Perform the reconnection work to join the bolts to.

[0004]

In the above-mentioned conventional jumper device 7, it is necessary to remove bolts of the jumper socket 4 in order to release the jumper device, but this operation is usually performed by the electric wire (transmission line) 2 or the insulator. He is riding in a row on the ream 6, and the work is in an unstable posture, so it requires skill. In addition, system disconnection is required to be performed promptly, but due to the unstable posture, work efficiency is poor, it takes time, and it may take time to prepare for suspension work. It was difficult to shorten the work time for system disconnection.

The present invention has been made in view of the above circumstances, and in the event of an electrical accident in a power transmission and distribution system, a jumper device of an overhead transmission line that can easily and quickly open a jumper device to disconnect the system. It is an object of the present invention to provide an apparatus and a method for dividing a system of an overhead transmission line.

[0006]

According to the present invention, there is provided a jumper device for an overhead power transmission line, which is connected between transmission lines on both sides of a tower which is fastened to a steel arm of a tower via an anchoring clamp and a tension insulator series. In the jumper device electrically connected via a jumper conductor whose both ends are electrically connected to the retention clamp, the jumper conductor is divided into two at an intermediate portion thereof, and the divided jumper conductors are divided into two. And at least one of the split jumper conductors is electrically connected via a detachable clamp for detachable connection.

According to a second aspect of the present invention, in the jumper device of the first aspect, the detachable clamp has a compression fixing portion that is compression-fixed to one of the split jumper conductors, a hinge portion on one side, which can be opened and closed, and a bolt on the other side. A detachable gripping portion having a fastening portion for detachably gripping the other split jumper conductor.

A third aspect of the present invention is to provide a jumper conductor between the transmission lines on both sides of the tower secured to the arm of the tower via the suspension clamp and the tension insulator series, and a jumper conductor having both ends electrically connected to the suspension clamp. A method for disconnecting an overhead power transmission line by opening a jumper device and electrically disconnecting the jumper device by means of a detachable clamp for detachably mounting one of the split jumper conductors. The jumper device is opened by separating one of the split jumper conductors of the two-divided jumper conductor connected to the clamper and the detachable clamp.

[0009]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS. The present invention, for example, 66k
It is suitable to be applied to a jumper device of an overhead transmission line in which the position of the retaining clamp is not so far from the tower body, such as an overhead transmission line of about V. FIG. 1 shows a jumper device 11 for an overhead power transmission line according to an embodiment of the present invention, wherein 1 is a steel arm of a steel tower, 2 is a power transmission line (main line), 3 is a termination clamp,
4 is a jumper socket, 15 is a jumper conductor, and 6 is a tension insulator series. The transmission line 2 is fastened to the arm 1 of the tower via an anchoring clamp 3 fixed to the end and a tension insulator series 6. The jumper conductor 15 is electrically connected between the transmission lines 2 on both sides of the tower by connecting the jumper sockets 4 fixed to both ends of the jumper conductor 15 to the retaining clamp 3 by bolts.

In the present invention, the jumper conductor 15 for electrically connecting the transmission lines 2 on both sides of the tower is divided into two parts at an intermediate portion thereof. Then, the two divided jumper conductors 15a and 15b are electrically connected to each other via a detachable clamp 16 that allows at least one of the divided jumper conductors to be detachable.

One embodiment of the detachable clamp 16 is shown in FIGS. The attachment / detachment clamp 16 is made of, for example, aluminum, and has a compression fixing portion 17 that is compression-fixed to one of the split jumper conductors 15a, and another compression jumper conductor 15a.
and a detachable gripping portion 18 for detachably gripping b. The detachable gripping portion 18 is integrally formed in a side-by-side manner. The detachable gripping portion 18 has a receiving portion 19 integrated with the compression fixing portion 17 and a hinge portion attached to the receiving portion 19. The cover 21 is openably and closably attached through the cover 20, and the receiving portion 19 and the flanges 19 a, 21 a provided integrally with the cover 21 are fastened and fixed by bolts 22. FIG. 5A is a cross-sectional view taken along line AA of FIG.
FIG. 5B is a cross-sectional view of the detachable clamp 16 in a state before the split jumper conductor 15a is compressed and fixed (the split jumper conductor 15b is not gripped, of course).

Next, a power outage accident, a grounding accident,
The procedure of the system disconnection work in the case where it is necessary to perform the system disconnection in the steel tower having the above-mentioned jumper device 11 due to an induction accident or the like and the case where the work scaffold 12 is used as shown in FIG. 2 will be described. . This work scaffold 12 is provided at the lower end of a main scaffold 12a suspended from the arm 1 of the tower.
Although it is a structure to which b is attached, a temporary type that is portable and can be installed each time, or a permanent type that is always installed on the armrest 1 of a steel tower may be used. The worker descends from the arm 1 of the tower to the scaffold plate 12b of the work scaffold 12, and removes one of the split jumper conductors 15b from the detachable clamp 16. In this case, in FIGS. 4 and 5A, when the bolt 22 is removed and the lid 21 of the detachable gripper 18 is opened, the split jumper conductor 15 b can be removed from the detachable gripper 18, that is, from the detachable clamp 16. . Then, the vicinity of the ends of the separated split jumper conductors 15a and 15b is temporarily held by the temporary hanging members 25 as shown in FIG. The configuration of the temporary suspension tool 25 is arbitrary, but for example, the one shown in the drawing is a wire 25a.
Attach hook 25b to one end and grip 25c to the other end
It is the structure which attached. The split jumper conductor 15
Since a and 15b have some rigidity, when they are bent at a curvature as shown in the figure, they are held in a bow shape as shown by the rigidity.

[0013] When reconnecting the divided power transmission and distribution system, work reverse to that at the time of the system disconnection work is performed. That is, FIG.
Each divided jumper conductor 15a temporarily held as in
15b is removed from the temporary suspending tool 25, and the end of one jumper conductor 15b is gripped by the detachable gripper 18 of the detachable clamp 16 which is compression-fixed to the end of the other jumper conductor 15a.

As described above, the work of disconnecting or reconnecting the system can be carried out, for example, on the work scaffold 12 immediately below the arm bar 1, so that the bolt connection to the distant clamp 3 is conventionally performed. The work can be performed in a reasonable posture as compared with the case of performing the bolt removal work of the jumper socket 4 that is performed, and the work is extremely easy and efficient, and the system can be quickly disconnected or reconnected. Can be. In addition, since system disconnection or reconnection can be performed by a detachment operation at one place in the jumper device 11, work of system disconnection or reconnection is efficient, and time can be reduced. Further, since the detachable clamp 16 of the above embodiment has a structure in which one of the split jumper conductors 15a is compressed and fixed by the compression fixing portion 17, the detachable clamp 16 does not fall off, and the workability is also good in this respect. In addition, the retaining clamp 3 and the portion of the jumper socket 4 joined thereto are the same as the existing one, and can be easily applied to the existing overhead transmission line by modifying only the jumper conductor.

FIGS. 6 and 7 show another embodiment of the detachable clamp. The detachable clamp 16A is formed by integrally forming a compression fixing portion 27 for compressing and fixing one split jumper conductor 15a and a detachable holding portion 28 for detachably holding the other split jumper conductor 15b. . FIG.
7A is a cross-sectional view of the compression fixing portion 27, and FIG. The attachment / detachment gripper 28 has substantially the same structure as the attachment / detachment gripper 18 of the attachment / detachment clamp 16 in FIGS. 31 and a flange 29 provided on the receiving portion 29 and the lid portion 31.
a and 31a are fastened and fixed by bolts 32.

FIGS. 8 and 9 show still another embodiment of the detachable clamp. The attachment / detachment clamp 16B of this embodiment includes:
A multi-conductor power transmission line adopts a boltless clamp structure used as a wire gripping portion of a spacer for maintaining a spacing between element conductors.
a and a detachable gripping portion 38 for detachably gripping the other split jumper conductor 15b is integrally formed in parallel with each other.
A receiving portion 39 integral with the compression fixing portion 37;
Lid 41 which can be opened and closed via a hinge part 40
And a connecting mechanism 43 attached to the side of the lid 41 opposite to the hinge section 40, and the projection 3 on the side of the receiving section 39 with the lid 41.
9a. The connecting mechanism 43 includes a pin 42
Spring arm 4 rotatably connected to lid 41 by
5, a shaft 46 integrally having an engagement protrusion 46a and a flange 46b is mounted with a nut 48 with a spring 47 interposed therebetween. 39a, the split jumper conductor 15b is gripped.

Since the above-mentioned detachable clamp 16B is a boltless type and does not require a bolt and nut tightening operation,
Work efficiency is further improved. Further, the boltless type detachable clamp 16B can be operated from, for example, the tower side by using a hot stick or the like having a detachable tool capable of operating the connection mechanism 43, thereby disconnecting and reconnecting the system. Work efficiency can be further improved. Also, this type of detachable clamp 1 using a spring 47
6B can secure a stable gripping force over a long period of time.

Although not shown in the drawings, the detachable clamps 18 and 28,
38, that is, both split jumper conductors 15
It is also possible to adopt a structure that can be attached to and detached from both a and 15b. In this case, the attachment / detachment clamp 16 itself can be replaced.

The present invention is preferably applied to a jumper device for an overhead transmission line in which the position of the retaining clamp is not far from the tower body, such as an overhead transmission line of about 66 kV. It is not limited to such a case.

[0020]

According to the present invention, the following various effects can be obtained. Since system disconnection or reconnection can be performed directly under the arm, it is more difficult than in the past when bolt removal and attachment of jumper sockets that are bolted to distant clamps are performed. Work can be performed in an unfriendly posture, the work is extremely easy and efficient, and the system can be disconnected or reconnected quickly. Further, when the work is performed using the work scaffold, the work efficiency is further improved. Since system disconnection or reconnection can be performed by a detachment operation at one place in the jumper device, the work of system disconnection is also efficient and time can be reduced also in this regard. When the detachable clamp has a structure in which one of the split jumper conductors is compressed and fixed by the compression fixing portion, there is no possibility that the detachable clamp will fall off, and the workability is good. The temporary holding of the jumper conductor while the jumper device is open can be easily and reliably performed by using the divided jumper conductor together with a temporary suspending tool that suspends the end of the jumper conductor toward the tension insulator side. The retaining clamp and the portion of the jumper socket joined thereto are the same as the existing one, and can be easily applied to the existing overhead transmission line by modifying only the jumper conductor portion.

In the case of using a boltless type detachable clamp, the operation efficiency is further improved because the tightening operation of bolts and nuts is unnecessary. In the case of a boltless type attachment / detachment clamp, by using a hot stick or the like equipped with an attachment / detachment tool capable of operating the coupling mechanism, for example, it is also possible to operate from the tower body side, and further disconnection of the system and further reconnection work. The efficiency can be improved. A bolt-less type attachment / detachment clamp usually has a structure using a spring, and this kind of attachment / detachment clamp can secure a stable gripping force over a long period of time.

[Brief description of the drawings]

FIG. 1 is a side view showing the vicinity of a jumper device showing an embodiment of a jumper device for an overhead transmission line according to the present invention.

FIG. 2 is a diagram illustrating a situation where a work scaffold is used when performing a system dividing operation in the jumper device of the overhead transmission line in FIG. 1;

FIG. 3 shows a jumper device for an overhead transmission line shown in FIG.
It is a figure showing the state where system division was performed.

FIG. 4 is a side view showing an embodiment of the detachable clamp shown in FIGS.

5A is an enlarged sectional view taken along the line AA in FIG. 4;
(B) is an enlarged sectional view showing the detachable clamp of FIG. 4 before the electric wire is gripped.

FIG. 6 is a side view showing another embodiment of the detachable clamp.

FIG. 7A is an enlarged sectional view taken along the line BB in FIG. 6;
(B) is a CC enlarged sectional view of the same.

FIG. 8 is a side view showing still another embodiment of the detachable clamp.

FIG. 9 is a sectional view taken along the line DD of FIG. 8;

FIG. 10 is a side view of a conventional jumper device for an overhead power transmission line.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 steel tower arm 2 transmission line 3 retention clamp 4 jumper socket 6 tension insulator series 11 jumper device 12 work scaffold 15 jumper conductors 15a, 15b split jumper conductors 16, 16A, 16B detachable clamps 17, 27, 37 compression fixing part 18 , 28, 38 Detachable gripping parts 19, 29, 39 Receiving part 19a, 21a, 29a, 31a Flange 20, 30, 40 Hinge part 21, 31, 41 Lid part 22, 32 Bolt 43 Connection mechanism

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuo Kojima 1-5-1 Kiba, Koto-ku, Tokyo F-Cla. F Term (reference) 5G367 JA09

Claims (3)

[Claims] 1. A transmission clamp (2) on both sides of a tower, which is fastened to an arm (1) of a tower via an anchor clamp (3) and a tension insulator string (6), and both ends of the anchoring clamp (2). Jumper conductor (15) electrically connected to 3)
A jumper device electrically connected through a jumper conductor (15), wherein the jumper conductor (15) is divided into two parts at an intermediate portion thereof, and the divided jumper conductor (15) is divided into two parts.
a) and (15b), a detachable clamp (1) for detachably attaching at least one of the split jumper conductors (15).
6) A jumper device for an overhead transmission line, which is electrically connected via (16A) and (16B). 2. The detachable clamps (16), (16)
A) and (16B) show one split jumper conductor (15
compression fixing parts (17), (27), which are compression-fixed to a)
(37) and hinge parts (20), (30), (4) on one side.
0) that can be opened and closed and has a bolt fastening portion on the other side and detachably grips the other split jumper conductor (15b) to detachably grip the other split jumper conductor (15b).
8) The jumper device for an overhead transmission line according to claim 1, wherein the jumper device comprises: 3. A pair of transmission lines (2) on both sides of a tower, which are fastened to a steel arm (1) of a tower via an anchoring clamp (3) and a tension insulator string (6), respectively, and both ends of the anchoring clamp (3). Jumper conductor (15) electrically connected to 3)
A method of disconnecting an overhead transmission line by opening the jumper device and electrically disconnecting the jumper device through the system, comprising: 16), (16A) and (16B), the two-part jumper conductor (15
a) and one of the split jumper conductors (1) in (15b).
5b) and the detachable clamps (16), (16A), (1)
6B) to open the jumper device to separate the overhead transmission line.