JPH0231941Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a lightning disconnection prevention device.

Prior Art In power distribution lines, when overvoltage due to lightning surge flashes over, grounding objects have non-linear voltage-current characteristics in order to suppress and interrupt the accompanying current and prevent wire breakage and damage to insulators due to follow-on arcs. Attach the ground side horn via the current limiting element unit,
A wire breakage prevention device is installed in which the wire is opposed to an insulated wire held by a high-voltage insulator with a discharge gap.

However, the above-mentioned lightning disconnection prevention device requires a mounting bracket to attach the current limiting element unit to a grounded object, and insulated wires on power distribution lines are mostly gripped by metal binding wires, which prevents lightning from breaking. During a flashover caused by a surge, the sheathing of the insulated wires is penetrated and destroyed, so once a flashover occurs, there is a risk that the binding wire will be charged.Furthermore, when installing the grounding horn, the horizontal angle and pull down of the installed wires may be affected depending on the topographical conditions of the line. Because of the corners, the discharge gap is not constant and the discharge voltage characteristics become unstable.

In addition, in order to avoid charging the bound wire, there is a wire-side horn for discharging mounted at a position away from the gripping point of the wire, for example, the mounting structure disclosed in Japanese Utility Model Application Publication No. 58-5225, In this case, it is necessary to extend the ground side horn to a corresponding distance, which often causes problems during installation and repair.

Purpose of the invention The present invention was made in order to eliminate the above-mentioned drawbacks, and its purpose is to allow the installation and repair of the wire-side horn unit and current-limiting element unit to be easily and safely carried out during live-line work. Another object of the present invention is to provide a lightning disconnection prevention device that can freely adjust the discharge gap according to the installation state of the electric wire and that does not expose the live part.

Structure of the Invention In order to achieve the above object, the present invention includes an insulating cover containing an insulating compound therein, an insulating base screwed onto one side of the insulating cover, and a base fixed to the insulating base. A wire-side horn unit is constituted by a discharge electrode that penetrates the sheath of the insulated wire and contacts the core wire by screwing, and the wire-side horn unit is attached to the insulated wire held by the high-voltage insulator with the bind wire. The insulating compound is applied and mounted from above, and the insulating base is provided with a discharge hole and a mounting hole communicating with the discharge hole on the discharge end side of the discharge electrode, and a current limiting element is attached to the mounting hole. A first air gap is formed between the current limiting element unit and the discharge end by inserting the current limiting electrode into the current limiting element unit. A screw is formed protruding in the axial direction of the element unit, and a mounting nut to which an arcing horn is attached is attached to the screw so that its position can be adjusted by screwing, and the arcing horn and the arcing horn are positioned by the mounting nut. A configuration is adopted in which a second air gap is formed between the arm and a grounded object.

Embodiment Hereinafter, an embodiment embodying the present invention will be described based on the drawings.A high-voltage insulator 2 is mounted on the upper surface of a arm 1 fixed horizontally to a utility pole (not shown) by its bolts 3 and nuts 4. It is fastened. An insulated wire 5 is tied to the upper part of the high voltage insulator 2 by a bind wire 6, and a wire-side horn unit 7 is mounted on the insulated wire.

The wire-side horn unit 7 includes an insulating compound 8 applied to the outer surface of the insulated wire 5, a cylindrical insulating cover 9 fitted so as to cover the bind wire 6 via the compound 8, and the insulating compound 8. An insulating base 10 is screwed and fixed to a boss portion 9a integrally formed on one side of the cover 9, and a covering portion 5 of an insulated wire 5 is fixed to the insulating base 10 and is screwed into the base 10.
A rod-shaped discharge electrode 11 made of a screw passes through the core wire 5b and electrically contacts the core wire 5b.

The insulating cover 9 is formed with a thin wall portion 9b, and the insulated wire 5 is formed as shown by the two-dot chain line in FIG.
It is designed to be opened centering on the thin wall portion 9b when it is fitted. In addition, the insulating cover 9 has ears 9.
c is formed, and one ear part 9c has a locking pin 12.
The insulating cover 9 is fixed to the insulated wire 5 by inserting the locking pin 12 into a locking hole 9d formed in the other ear portion 9c.
Further, both ends of the insulating cover 9 are formed to have a small diameter as shown in FIG.
is formed.

A current limiting element unit 13 is mounted on the insulating base 10 of the wire-side horn unit 7. As shown in FIG. 2, this current-limiting element unit 13 includes a current-limiting element 14 whose voltage-current characteristics are non-linear, and electrodes 15 on the charging side and discharging side that are connected to the upper and lower surfaces of the current-limiting element 14. , 16, and an elastic insulator 17 integrally molded to cover these three members. In addition, this current limiting element unit 13 is connected to a screw 1 formed at the upper end of the energizing side electrode 15.
5a is screwed into a screw hole 10a as a mounting hole formed in the insulating base 10, and is attached to the wire-side horn unit 7. screw 15a
A certain first air gap G1 is provided between the insulating base 10 and the discharge hole 10b formed in communication with the screw hole 10a. The through hole 10c is connected to the discharge hole 10b from the outer periphery of the insulating base 10.
A suitable number of through holes are provided to communicate with each other to discharge discharge gas and release water and moisture inside the insulating cover 9.

The discharge side electrode 16 of the current limiting element unit 13 is formed with a screw 16a that projects in the axial direction of the current limiting element unit 13, and a mounting nut 18 is screwed onto the screw 16a so that the vertical position can be adjusted. The arcing horn 1 is screwed into the mounting nut 18.
A screw 19a provided at the base end of 9 is screwed together. A locking nut 20 for positioning and fixing a mounting nut 18 to the screw 16a is screwed onto the screw 16a of the discharge side electrode 16, and the arcing horn 19 is fixed to the base end of the arcing horn 19 to the mounting nut 18. For this purpose, a locking nut 21 provided on one side of the mounting nut 18 is screwed together. The arcing horn 19 is bent at the intermediate portion, and a second air gap G2 is provided between the discharge end portion 19b and the arm (grounding object) 1. This air gap G2 can be adjusted by vertically and horizontally adjusting the mounting nut 18, or by adjusting the arcing horn 19.
The vertical and horizontal positions can be adjusted by rotating and adjusting the position around its base end.

A discharge side electrode 1 is provided at the lower end of the elastic insulator 17.
An electrode cover 22 made of an insulating material is fitted to cover the arcing horn 19, and a horn cover 23 made of an insulating material covers the outer periphery of the arcing horn 19.

Next, the operation of the lightning disconnection prevention device configured as described above will be explained.

Now, when a lightning impulse overvoltage caused by a lightning strike is applied to the insulated wire 5 to the lightning disconnection prevention device installed as shown in FIGS. 1 and 2, a discharge that electrically contacts the core wire 5b It flashes over from the discharge end 11a of the electrode 11 through the discharge hole 10b of the insulating base 10 to the energizing side electrode 15, and then the current limiting element 14, the discharge side electrode 16, the screw 16a, the mounting nut 18 and the arcing horn 19 are connected. Then, it flashes over to the cross arm 1, and is further grounded via a lead wire (not shown), etc., and the following current is suppressed and interrupted by the voltage-current non-linear characteristics of the current limiting element 14 interposed in the line, so that no following current arc occurs. Electric wires, etc. caused by this will be prevented.

Now, in the embodiment of the present invention, an insulating compound 8 coated on the insulated wire 5 and the binding wire 6, an insulating cover 9 containing the insulating compound, and a boss portion 9a integrally formed on one side of the insulating cover 9 are screwed together. A fixed insulating base 10 and a discharge electrode 11 that is fixed to the insulated base 10 and penetrates the covering portion 5a of the insulated wire 5 and contacts the core wire 5b by screwing into the base.
The wire-side horn unit 7 is constructed by attaching the wire-side horn unit 7 to the insulated wire 5 from above the binding wire 6, and the current-limiting element unit 13 is attached to the insulating base 10. A first air gap G1 is provided between the discharge hole 10b and the discharge hole 10b.
Since the binding wire 6 is contained in the wire, it is possible to prevent charging of the binding wire 6, and the current limiting element unit 13 can be installed near the high voltage insulator 2, and the mounting bracket for the current limiting element unit 13 is not required, resulting in a compact structure. It is possible to install pillars.
Further, since the discharge side electrode 16 of the current limiting element unit 13 is not exposed as a charged part due to the first air gap G1, live wire work can be performed.

In addition, in the embodiment of the present invention, since the arcing horn 19 is attached to the current limiting element unit 13 so that its position can be adjusted in the vertical and horizontal directions, the second air The intermediate gap G2 can be freely adjusted.

Furthermore, in the embodiment of the present invention, since the first air gap G1 is enclosed by the discharge hole 10b of the insulating base 10, there is no possibility that a foreign object may accumulate between the second air gap G2 and the grounded object. It is possible to prevent a ground fault from occurring, deterioration of the current limiting element 14 due to constant line voltage, and further damage from birds.

Note that the present invention can also be embodied in the following embodiments.

(1) The arcing horn 19 is formed into a straight plate shape, and the base end of the horn is fastened with the mounting nut 18 and the locking nut 20 to be mounted.

(2) The electrode cover 22 and horn cover 23 may be omitted.

Effects of the invention As detailed above, according to this invention, if the insulating base is screwed onto one side of the insulating cover attached to the insulated wire from above the bind wire, the discharge fixed to the insulating base will be removed. Since the electrode penetrates the sheathing of the insulated wire by screwing into the base and contacts the core wire, there is no need to strip the insulation sheath when installing the wire-side horn unit, and there is no need to remove the insulation from the wire-side horn unit's discharge electrode. Since the first air gap is formed between the energized side electrodes of the element unit, the energized side electrode of the current limiting element unit is not exposed as a live part, and the wire side horn unit and the current limiting element unit are The installation and repair of the arcing horn can be easily and safely carried out during live wire work, and the position of the arcing horn can be adjusted vertically and horizontally by screwing the mounting nut to which the arcing horn is attached onto the screw. Since the discharge gap can be freely adjusted according to the installation condition of the electric wire, and the first air gap is enclosed by the discharge hole of the insulating base, the live parts will not be exposed. It has high practical value.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the lightning disconnection prevention device of the present invention, Fig. 2 is an enlarged vertical sectional view of the wire-side horn unit and current limiting element unit, and Fig. 3 is an enlarged cross-sectional view of the wire-side horn unit. FIG. 4 is a plan view showing the positional relationship between the arms and the arcing horn. DESCRIPTION OF SYMBOLS 1... Bracelet, 2... High voltage insulator, 5... Insulated wire, 5a... Sheathing part, 5b... Core wire, 6... Binding wire, 7... Wire side horn unit, 8... Insulating compound, 9 ...Insulation cover, 10...Insulation base, 10a...Mounting hole, 10b...Discharge hole,
11...discharge electrode, 11a...discharge end, 13...
... Current-limiting element unit, 14... Current-limiting element, 15...
...Electricity side electrode, 16...Discharge side electrode, 16a...
Screw, 17...Elastic insulator, 18...Mounting nut, 19...Arching horn, 19a...Screw, 22...Electrode cover, 23...Horn cover, air gap G1, G2.

Claims (1)

[Claims for Utility Model Registration] 1. An insulating cover 9 containing an insulating compound 8 therein, an insulating base 10 screwed onto one side of the insulating cover 9, and an insulating base 10 fixed to the insulating base 10. By screwing the base 10, the covering portion 5a of the insulated wire 5 is
A wire-side horn unit 7 is constituted by a discharge electrode 11 that penetrates through and contacts the core wire 5b, and the wire-side horn unit 7 is attached to the insulated wire 5 held by the high-voltage insulator 2 with the bind wire 6. The insulating compound 8 is applied and mounted from above, and the insulating base 10 is provided with a discharge hole 10b on the discharge end 11a side of the discharge electrode 11 and a mounting hole 10a communicating with the discharge hole 10b, and the mounting Hole 10a
The voltage-applying side electrode 15 of the current-limiting element unit 13
is inserted into the discharge end 11 in the discharge hole 10b.
A first air gap G1 is formed between the current limiting element unit 13 and the discharge side electrode 16 of the current limiting element unit 13. screw 16a
A mounting nut 18 to which an arcing horn 19 is attached is mounted so that its position can be adjusted by screwing, and between the arcing horn 19 positioned by the mounting nut 18 and a grounded object such as the arm arm 1. A lightning disconnection prevention device characterized in that a second air gap G2 is formed in the. 2. The arcing horn 19 is curved,
Utility model registration claim 1, in which the screw 19a at the base end is screwed into the side surface of the mounting nut 18
Lightning disconnection prevention device as described in . 3 Discharge side electrode 16 of the current limiting element unit 13
and the arcing horn 19 is connected to the electrode cover 22
and the lightning disconnection prevention device according to claim 1, which is covered by a horn cover 23.