JP2558413Y2 - Jumper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a jumper device for preventing a ground fault due to bird damage.

[Conventional technology]

In the overhead power transmission line jumper device, as shown in FIG. 4, transmission lines 22, 22 fixed to a tower arm 20 via insulator chains 21, 21 are connected to each other by bare jumper wires 23. When a bird, such as a crow, nests on a steel tower and adds a metal wire such as a wire for nesting and stops at the tip of the tower arm, the tip of the drooping metal wire contacts the jumper wire and flashes, causing a ground fault. The wings that arose or spread when the bird took off were in contact with the jumper wires, causing a ground fault. Hundreds of such ground-fault accidents occur annually, and are becoming a social problem as OA and FA progress.To prevent such ground-fault accidents due to bird damage, radiation Wrap a spiral tape made of cross-linked polyolefin resin around the jumper wire,
It has been proposed to heat-crosslink this tape and apply an insulating coating to the jumper wire.

Although it is not to prevent the above-mentioned jumper wires from being damaged by birds, as a cover for protecting the outer layer of communication cables and electric wires from obstacles such as trees, the cover is continuous with the open end of the open-type plastic pipe in the longitudinal direction. A flexible foam plastic layer is adhered to the inside of the pipe, and the cable is covered with the hook.The open end of the plastic tube is closed over the entire length in the longitudinal direction with the hook to cover the entire circumference of the cable. A surrounding protective cover for cables of Japanese Utility Model Publication No. 43-14578 is known.

[Problems to be solved by the invention]

The insulation coating of a jumper wire, which is obtained by wrapping a spiral-shaped tape made of a radiation-crosslinked polyolefin resin around a jumper wire and heating it, is not easy (1) to take a long time and cannot be applied in rainy weather. (2) High voltage (66-77k
In the jumper wire of V), two layers of spiral tape must be wound and crosslinked by heating, so that the operation is further complicated and takes a long time. (3) Rainwater stays between the jumper wire and the insulating coating, causing corrosion and deterioration of the jumper wire.
(4) If a ground fault occurs during rainy weather, there is a danger that the jumper wire will be broken by an arc. (5) If an insulation coating is applied to the jumper wire, the heat radiation property deteriorates and the allowable current decreases.
(6) Deterioration of the insulating coating due to tracking is apt to proceed.

In addition, the protective cover for the cable of the utility model announcement,
Since this is to protect the outer layer of communication cables and electric wires from obstacles such as trees and not to the jumper wires of high-voltage transmission lines, if this is installed on jumper wires, open the plastic pipe. Since the ring end is closed over the entire length in the longitudinal direction with a locking hook and surrounds the entire outer circumference of the jumper wire, the heat dissipation of the jumper wire is poor, not only the allowable current capacity is reduced, but also the foam plastic due to the heat generated by the jumper wire The layer melts and the plastic tube also melts, making it impossible to prevent a ground fault due to the metal of the nesting material, and furthermore, rainwater stays in the tube and corrodes and deteriorates the jumper wire. There's a problem.

The present invention solves the above-mentioned problems, and can prevent a ground fault accident by maintaining a sufficient surface leakage distance even if the metal tip of the nesting material hangs down, and has good heat dissipation properties, and It is an object of the present invention to provide a safe jumper device in which rainwater does not stay inside and which can be easily mounted on a jumper wire.

[Means for solving the problem]

In order to achieve the above object, the jumper wire of the present invention is:
A plurality of insulating rings 5 are attached at intervals to the center of the jumper line, and a longitudinally continuous surface which has a slit 7 on the lower surface of the cylindrical body and protrudes downward from both ends of the slit 7. An insulating cover 6 provided with parallel fins 8 for securing a leakage distance is provided on the insulating ring 5.

[Action]

The plurality of insulating rings 5 attached to the jumper wires at intervals form a gap between the jumper wires and the insulating cover 6, so that the insulating cover 6 has a high insulation without having to have a heavy wall thickness. Therefore, even if the hanging tip of the metal wire of the nesting material comes into contact with the insulating cover 6, no flashover occurs with the jumper wire.

Since the surface leakage distance of the insulating cover 6 is secured by the longitudinally continuous parallel fins 8, 8 protruding downward from both sides of the slit 7 on the lower surface of the insulating cover 6, the slit 7 is formed on the lower surface. Even if it is open, the flashover accident can be prevented.

It is necessary to secure the surface leakage distance of the insulating cover 6 according to the voltage.
8 can be easily performed by adjusting the length protruding downward.

The slits 7 opening in the longitudinal direction of the lower surface of the insulating cover 6 allow air in the insulating cover to enter and exit freely and improve the heat dissipation of the heat generated by the jumper wire. There is no deterioration of the insulating cover 6.

In addition, the slit 7 opened in the longitudinal direction of the lower surface of the insulating cover 6 drains immediately even if rainwater enters the insulating cover, so that the rainwater does not stay and does not deteriorate due to corrosion of the jumper wire.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the jumper device of the present invention, and FIGS.
The figure shows a sectional view and a longitudinal section.

1 is a tower arm, 2 and 2 are insulator trains, and 3 and 3 are transmission lines secured to the tower arm 1 via the insulator trains 2 and 2;
Reference numeral 4 denotes a bare jumper wire connecting the transmission lines 3 and 3.

Reference numeral 5 denotes a plurality of insulating rings made of a plastic such as polycarbonate or polyamide.
At the center of the space between 50cm ~ 1m. By increasing the outer diameter of the insulating ring 5, the gap formed between the jumper wire 4 and the insulating cover 6 described later is increased, so that the insulating cover 6 can be increased without having to have a heavy wall thickness. Insulation characteristics can be obtained.

Reference numeral 6 denotes an insulating cover having a length L made of an insulating and heat-resistant plastic, such as cross-linked polyethylene, silicone rubber, or a hybrid laminated material. A slit 7 is provided in the direction, and two parallel fins 8 for securing the surface leakage distance are provided so as to protrude downward from both sides of the slit 7 and are continuous in the longitudinal direction.

The length of the downward protrusion of the surface fins 8 for securing the surface leakage distance is adjusted according to the voltage, and the length of the protrusion is increased as the voltage becomes higher.

The insulating cover 6 is placed on the insulating ring 5 attached to the center of the jumper wire 4 at an interval.

Reference numeral 9 denotes a pin insertion hole provided in the parallel fins 8, 8 for securing the surface leakage distance. A fixing pin 10 is inserted into the pin insertion hole to hold the parallel fins 8, 8 at a predetermined interval, thereby forming the insulating cover 6. It is mounted on the jumper wire 4 by fixing it on the insulating ring 5. In addition, it can also be fixed by winding a tape.

As described above, the jumper device of the present invention in which a plurality of insulating rings 5 are attached at intervals at the center of the jumper wire 4 and the insulating cover 6 having a required length L is mounted thereon, stops at the tip of the tower arm. Even if the tip of the metal wire of the nesting material with the birds hangs down at the center of the jumper line, the parallel fins 8, 8 for securing the surface leakage distance form a sufficient surface leakage distance according to the voltage, so There is no danger of a ground fault like this. Instead of using one insulating cover 6 having a predetermined length L sufficient to prevent a ground fault even if the tip of the nesting metal wire hangs at the center of the jumper wire, the insulating cover 6 is formed to have a length of 1 to 2 m. May be used plurally.

Further, if a fluorine-based resin is applied to the outer peripheral surface of the insulating cover 6 to impart water repellency, it is useful to prevent the occurrence of corona.

[Effect of the invention]

As described above, in the jumper device of the present invention, a plurality of insulating rings are attached at intervals in the center of the jumper line, and a parallel fin for securing a surface leakage distance protruding downward from both ends of the longitudinal slit on the lower surface. Since the provided insulating cover is configured to cover the insulating ring, the following effects can be obtained.

The parallel fins for securing the surface leakage distance increase the surface leakage distance of the insulating cover, and by adjusting the downward protruding length of the parallel fins for securing the surface leakage distance, the surface leakage distance can be secured according to the voltage. Even if the tip of the metal wire of the nesting material hangs down, a sufficient surface leakage distance can be secured between the jumper wire and the jumper wire. A gap is formed between the insulating cover and the insulating cover, and high insulating properties can be obtained without making the insulating cover thick and heavy, so that a ground fault can be reliably prevented.

In addition, since the slit that opens in the longitudinal direction of the lower surface of the insulating cover is provided, the heat dissipation of the heat generated by the jumper wire is improved,
The allowable current capacity is not reduced, and the heat does not deteriorate the insulating ring or the insulating cover.

Furthermore, since the insulating cover is provided with a slit that opens in the longitudinal direction of the lower surface, even if rainwater enters the insulating cover, it is immediately drained and does not stay, so that corrosion of the jumper wire does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view of one embodiment of the present invention, FIG. 2 is a transverse sectional view thereof, FIG. 3 is a longitudinal sectional view thereof, and FIG. 4 is a view showing a conventional jumper device. 4 is a jumper wire, 5 is an insulating ring, 6 is an insulating cover, 7
Is a slit, and 8 is a parallel fin for securing the surface leakage distance.

 ──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-57-156611 (JP, A) JP-A 63-83925 (JP, U) JP-A 43-14578 (JP, Y1) JP-A 49- 7120 (JP, Y1)

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of insulating rings (5) are attached at intervals to the center of a jumper wire, and have a slit (7) in the longitudinal direction on the lower surface of the cylindrical body, and both ends of the slit (7). A jumper device in which an insulating cover (6) provided with parallel fins (8) and (8) for securing a surface leakage distance extending in the longitudinal direction and protruding downward from the insulating ring (5) is placed on the insulating ring (5).