JP4494677B2 - Pipe type jumper device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe-type jumper device for an overhead power transmission line.
[0002]
[Prior art]
FIG. 6 shows a conventional pipe-type jumper device. The pipe-type jumper device electrically connects multi-conductor power transmission lines 16 that are respectively retained on both sides of a steel tower arm (FIG. 6 shows only one side) via an insulator series 10, a yoke 12, and a retention clamp 14. Thus, it is composed of a pipe conductor 18, a jumper wire 20, a support fitting 22, and the like.
[0003]
The pipe conductor 18 has a configuration in which two aluminum pipes are arranged in parallel in the same horizontal plane (there may be one aluminum pipe). In general, the number of jumper wires 20 is the same as that of the multi-conductor power transmission line 16 (in this case, four wires may be different from the number of multi-conductor power transmission wires), and one end is compression-connected to the jumper socket 14a of the retaining clamp 14 The other end is compression-connected to the connection socket 24. The connection socket 24 is tightened and connected to a connection terminal 26 attached to the end of the pipe conductor 18. The distance between the jumper wires 20 is held by jumper spacers 28. One end of the support fitting 22 is connected to the yoke 12, and the other end is connected to the pipe conductor 18 via the pipe gripping fitting 29, thereby supporting the pipe conductor 18 horizontally (in the case of slanting suspension depending on the height difference) There is also.)
[0004]
[Problems to be solved by the invention]
When galloping vibration occurs in the transmission line 16 between the spans, resonance of the pipe jumper device occurs when the galloping cycle matches the natural vibration cycle of the pipe jumper device. At this time, since the jumper wire 20 also vibrates greatly, excessive stress is generated in the jumper wire 20 at the mouth of the connection socket 24, and the strands of the jumper wire 20 are damaged or disconnected. As shown in FIG. 7, if damage or disconnection of the wire occurs outside the compression sleeve portion (point A) of the connection socket 24, an abnormality can be easily found by visual inspection. If it occurs inside (point B), no abnormality can be found by visual inspection. If a damaged or broken wire is not found and left as it is, the jumper wire will eventually be broken, which may cause a serious electrical accident.
[0005]
In view of the above problems, an object of the present invention is to provide a pipe-type jumper device in which excessive stress is not applied to a jumper wire at the mouth of a connection socket.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the present invention comprises a pipe conductor and a jumper wire connecting between the end of the pipe conductor and the retention clamp of the overhead power transmission line, and is attached to the end of the jumper wire on the pipe conductor side. In the pipe type jumper device in which the connection socket is connected to the connection terminal attached to the end portion of the pipe conductor, the wire gripping portion can be tilted at the end portion of the pipe conductor corresponding to each jumper wire. A movable clamp that can be restored to an appropriate posture by a coil spring is attached so as to be located inside the connection terminal , the connection socket is connected to the connection terminal so that the jumper wire is drawn out to the pipe conductor side, and the jumper wire is The folded portion is folded toward the retaining clamp in the vicinity of the connection socket, and the folded portion is gripped by the movable clamp .
[0008]
Further, in the pipe type jumper device of the present invention, the movable clamp is attached to the pipe conductor so as to be positioned inside the connection terminal, and the connection socket is drawn out to the pipe conductor side with a short auxiliary conductor attached. It is also possible to connect to the connection terminal, electrically connect the end portion of the auxiliary conductor and the end portion of the jumper wire, and hold the jumper wire near the connection portion with the movable clamp.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0011]
Embodiment 1 FIGS. 1 to 3 show an embodiment of the present invention. This pipe-type jumper device has a pipe conductor 18, a jumper wire 20 that connects the end of the pipe conductor 18 and an aerial transmission line retention clamp (see FIG. 6), and a support bracket that supports the pipe conductor 18, as in the prior art. 22 and.
[0012]
The difference between this pipe type jumper device and the conventional device is that the movable clamp 30 is attached inside the connection terminal 26 at the end of the pipe conductor 18 as shown in FIG. As shown in FIG. 1, the jumper wire 20 is clamped and connected to the connection terminal 26 so as to be drawn out to the pipe conductor 18 side, and the jumper wire 20 is folded back toward the retention clamp near the connection socket 24. In other words, the folded portion is held by the movable clamp 30.
[0013]
The movable clamp 30, like the clamp of the multi-conductor transmission line spacer, is provided with a force that allows the wire gripping portion to tilt but is restored to an appropriate posture by a coil spring. For example, the movable clamp 30 has a structure as shown in FIG. It is. In FIG. 3, 32 is a clamp body, 34 is a clamp cap, 36 is a hinge pin, 38 is a tightening bolt, 40 is an eye bolt having a bolt insertion hole at one end, and 42 is a shaft for rotatably connecting the clamp body 32 and the eye bolt 40. Bolt 44 is a pedestal having a hole through which eyebolt 40 is passed, 46 is a collar part fixed to eyebolt 40 and abuts against the surface of clamp body 32 side of pedestal 44, 48 is to sandwich pedestal 44 between collar part 46 A coil spring arranged around the eyebolt 40, a nut 50 for compressing the coil spring 48 through a washer 52, and an insulating plate 54 affixed to the mounting surface of the base 44 to the pipe conductor.
[0014]
The movable clamp 30 having the above structure is attached to the pipe conductor 18 as shown in FIG. 2, and the wire gripping portion (the clamp body 32 and the clamp cap 34) has a certain range according to the movement of the jumper wire 20. However, when the jumper wire 20 does not move, the wire gripper can hold an appropriate posture by the elastic repulsion force of the coil spring 48 (the interval between the jumper wires 20 can be kept constant).
[0015]
If the folded portion of the jumper wire 20 is gripped by such a movable clamp 30 as shown in FIG. 1, even if the jumper device resonates due to galloping between the spans, the jumper wire 20 is connected to the jumper wire 20 at the mouth of the connection socket 24. Excessive bending stress is no longer generated, and damage or disconnection of the jumper wire 20 can be prevented. Also, at the place where the jumper wire 20 is gripped by the movable clamp 30, the movable clamp 30 can follow the movement of the jumper wire 20 within a certain range, so there is little possibility that excessive bending stress is generated on the jumper wire 20 here. Damage to or breakage of the wire 20 can be suppressed. In addition, since the movable clamp 30 is a tightening type, whether or not the jumper wire 20 is damaged or broken in the movable clamp 30 is determined by releasing the tightening bolt 38 and opening the clamp cap 34. It can be easily checked. Therefore, if comprised as mentioned above, it becomes possible to prevent serious accidents such as jumper wire breakage. The insulating plate 54 is for electrically insulating the movable clamp 30 and the pipe conductor 18 so that no current flows through the movable clamp 30.
[0016]
Embodiment 2 FIG. 4 shows another embodiment of the present invention. In this pipe-type jumper device, a movable clamp 30 is attached inside the connection terminal 26 at the end of the pipe conductor 18, and a short auxiliary conductor 56 is compression-connected to the connection socket 24. The auxiliary conductor 56 is connected to the connection socket 24 by a pipe. Tightly connected to the connection terminal 26 so as to be drawn out to the conductor 18 side, and the end of the auxiliary conductor 56 and the end of the jumper wire 20 are electrically connected by a PG clamp (parallel groove clamp) 58, and the vicinity of this connection The jumper wire 20 is gripped by the movable clamp 30. A corona prevention cap 60 is attached to the ends of the jumper wire 20 and the auxiliary conductor 56. Even with such a configuration, the same effects as those of the first embodiment can be obtained.
[0017]
[ Related Art 1 ] FIG. 5 shows a related art of the present invention. In this pipe type jumper device, the movable clamp 30 and the connection terminal 26 are attached to the end of the pipe conductor 18 so that the former is located outside the latter, and the connection socket 24 is pulled out toward the retention clamp. connected to a connection terminal 26, the Ru der connection socket 24 around the jumper wire 20 that is gripped by the movable clamp 30.
[0018]
In the first and second embodiments, the structure of the end of the pipe conductor 18 is the same as that of the conventional one so that it can be applied to an existing jumper device. It is possible to simplify the wiring of the jumper wire 20 by making the portion a structure like this related technology .
[0019]
【The invention's effect】
As described above, according to the present invention, the jumper wire in the vicinity of the connection socket for connecting the jumper wire to the pipe conductor is gripped by the movable clamp attached to the pipe conductor, so that the pipe is used for galloping the transmission line between the spans. Even if the type jumper device resonates, excessive stress is not generated in the jumper wire at the mouth of the connection socket, and damage to the strand of the jumper wire or disconnection can be prevented. Also, at the place where the jumper wire is gripped by the movable clamp, the movable clamp can follow the movement of the jumper wire to a certain extent, so there is little possibility that excessive stress is generated on the jumper wire, and the jumper wire is damaged. And disconnection can be suppressed. Therefore, the risk of serious accidents such as jumper wire breakage can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a side view of essential parts showing an embodiment of a pipe-type jumper device according to the present invention.
FIGS. 2A and 2B are front views and FIG.
FIG. 3 is a front view showing a movable clamp used in the apparatus of FIG.
FIG. 4 is a side view of a main part showing another embodiment of the present invention.
FIG. 5 is a side view of a main part showing a related technique of the present invention.
FIG. 6 is a side view showing a conventional pipe-type jumper device.
FIG. 7 is a cross-sectional view showing a jumper wire abnormality occurrence position in a conventional pipe-type jumper device.
[Explanation of symbols]
18: Pipe conductor
20: Jumper wire
22: Support bracket
24: Connection socket
26: Connection terminal
30: Movable clamp
32: Clamp body
34: Clamp cap
44: Pedestal
48: Coil spring
56: Auxiliary conductor
58: PG clamp

Claims (2)

A connection socket (24) provided with a pipe conductor (18) and a jumper wire (20) connecting between the end of the pipe conductor and an aerial transmission line retention clamp, and attached to the end of the jumper wire on the pipe conductor side ) Is connected to the connection terminal (26) attached to the end of the pipe conductor.
At the end of the pipe conductor (18), the wire gripping part (32, 34) can be tilted corresponding to each jumper wire (20), but it can be restored to the proper posture by the coil spring (48). Attach the clamp (30) so that it is located inside the connection terminal (26) ,
The connection socket (24) is connected to the connection terminal (26) so that the jumper wire (20) is drawn to the pipe conductor (18) side,
The jumper wire (20) is folded toward the retention clamp in the vicinity of the connection socket (24), and the folded portion is gripped by the movable clamp (30) .
A pipe-type jumper device. A connection socket (24) provided with a pipe conductor (18) and a jumper wire (20) connecting between the end of the pipe conductor and an aerial transmission line retention clamp, and attached to the end of the jumper wire on the pipe conductor side ) Is connected to the connection terminal (26) attached to the end of the pipe conductor.
At the end of the pipe conductor (18), the wire gripping part (32, 34) can be tilted corresponding to each jumper wire (20), but it can be restored to the proper posture by the coil spring (48). a clamp (30), attach so as to be positioned inside the said connection terminal (26),
The connection socket (24) is connected to the connection terminal (26) so that the auxiliary conductor is drawn out to the pipe conductor (18) side with the short auxiliary conductor (56) attached.
The end of the auxiliary conductor (56) and the end of the jumper wire (20) were electrically connected, and the jumper wire (20) near the connection was gripped by the movable clamp (30).
Features and to Rupa type type jumper device that.

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