JP3020959U - Metal binding wire with discharge electrode - Google Patents

Abstract

The present invention provides a metal binding wire with a discharge electrode, which has an existing simple discharge electrode shape and does not constantly energize a current limiting element unit, and which has good workability in pillar mounting. A discharge electrode (2) is provided at one end of a core wire (4) of a metal binding wire having a grip portion (1a) for attaching an insulated electric wire (7) to the head of an insulator (15).

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a metal binding wire with a discharge electrode, which has a grip for attaching an insulated wire to the head of an insulator, and more specifically, also serves to prevent the insulated wire from being broken due to abnormal voltage such as lightning surge. The present invention relates to a metal bind wire with a discharge electrode.

[0002]

[Prior art]

 The metal binding wire is used to attach an insulated electric wire to the head of an insulator attached to a grounding metal fitting such as a grounding arm and is well known in the art.

On the other hand, in a transmission / distribution line in which an insulated electric wire is attached to the head of an insulator attached to a grounding metal, when an abnormal voltage such as a lightning surge occurs in the insulated electric wire, the insulation coating of the insulated electric wire penetrates the core. An accident occurs in which the insulated wire is melted and broken due to the arc heat of the follow-up arc caused by a flashover between the wire and the grounding fitting.

Therefore, in order to prevent the above-mentioned accident, a current limiting element unit having a current limiting element made of a material having a non-linear voltage-current characteristic is arranged on the side of the grounding metal, and the current limiting element unit is charged with electricity. A device for preventing breakage of an insulated wire due to lightning having a structure in which a loop-shaped discharge electrode is provided on the side is proposed in, for example, Japanese Utility Model Publication No. 61-31455 and Japanese Utility Model Publication No. 2-31938. On the other hand, a device for preventing disconnection of an insulated wire due to lightning, in which a current limiting element unit is electrically connected to an insulated wire and a discharge electrode is provided on the ground side, is disclosed in, for example, Japanese Utility Model Publication No. 2-29677. Has been proposed to.

[0005]

[Problems to be solved by the device]

 By the way, in the proposals of the above-mentioned Japanese Utility Model Publication No. 61-31455 and Japanese Utility Model Publication No. 2-31938, an air gap is provided between the loop-shaped discharge electrode and the insulated wire. Since a flashover due to an abnormal voltage is captured by a loop-shaped discharge electrode through a gap, it is safe because there is nothing electrically connected to the core wire on the insulated wire side, but the shape of the discharge electrode However, it is complicated to install in the field while maintaining the air gap between the discharge electrode and the insulated wire.

Further, in the one proposed in the above Japanese Utility Model Publication No. 2-29677, since the current limiting element unit is electrically connected to the insulated wire, there is a concern that it is always in a voltage applied state and deteriorates. In addition, the installation of the current limiting element unit is complicated and the work of mounting the column is poor.

The present invention has been made based on the above circumstances, and its purpose is to provide an existing simple shape of a discharge electrode to a current limiting element unit without constantly energizing it. It is intended to provide a metal bind wire with a discharge electrode having good workability for a pillar.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the metal bind wire with a discharge electrode according to the present invention has a discharge electrode at one end of the core wire of the metal bind wire having a grip for attaching an insulated wire to the head of an insulator. It is provided.

In the metal bind wire with the discharge electrode, the discharge electrode may be integrally provided at one end of the core wire of the metal bind wire, or may be welded and connected.

The metal bind wire with a discharge electrode according to the present invention having the above-mentioned configuration is used in combination with the current limiting element unit arranged on the grounding metal side, and is integrally provided at one end of the metal bind wire. The shape of the provided discharge electrode is simple because the tip of the discharge electrode is arranged so as to face the tip of the discharge electrode on the voltage-limiting side of the current limiting element unit. Moreover, by electrically connecting the other end to an insulated wire and covering the insulating cover, and because the metal binding wire itself has an insulating coating, it is electrically safe and the metal binding wire has a current limiting element unit. Since the current limiting element unit is not always energized, the workability of mounting the metal binding wire is improved.

[0011]

[Embodiment of device]

 FIG. 1 is an explanatory view of a metal binding wire with a discharge electrode according to the present invention, wherein a is a general view, b is a sectional view taken along the line XX of a, and FIG. 2 is a metal binding with a discharge electrode according to the present invention. FIG. 3 is an explanatory view of the implementation state of the line, and FIG. 3 is a top view of FIG. 2. In the figure, 1 is a metal-bonded wire main body, 2 is a discharge electrode, and 3 is an electrical connector.

The metal binding wire body 1 is formed by coating a core wire 4 made of steel wire or the like with an insulating resin 5 such as polyethylene resin.

The discharge electrode portion 2 is formed by linearly molding one end of the core wire 4, and is covered with the insulating resin 5 except for the tip portion 6 of the linear portion. The discharge electrode portion 2 may be formed by processing a metal rod separately from the core wire 4 and welding or mechanically attaching the metal bar to the end of the core wire 4 and coating the insulating resin 5.

The electrical connecting device 3 has an upper piece 9 in which a groove 8 for mounting the insulated electric wire 7 is formed in the central part, and a flat plate shape attached to both side parts 10 of the groove 8 of the upper piece 9 with bolts and nuts 11. And a needle-like projection 13 that can penetrate the insulating coating 7a of the insulated wire 7 and reach the core wire 7b. The end of the core wire 4 opposite to the discharge electrode portion 2 is welded and fixed to the upper piece 9.

The electrical connection tool 3 is not limited to the above-described embodiment, and the point is that the core wire 4 of the metal binding wire and the core wire 7b of the insulated wire 7 can be electrically connected. The upper piece 9 and the lower piece 12 may be configured such that one end is pin-connected and the other end is openable / closable, and the insulated wire 7 is attached to the groove 8 after the bolt. It may be fixed with the nut 11. Further, the lower piece 12 may be formed in the same shape as the upper piece 9, and in this case, the groove 8 is formed in an arc larger than the outer diameter of the insulated wire 7 and the insulated wire 7 is sandwiched by the upper and lower arc grooves 8. It is good to have a configuration to obtain. Further, the needle-like protrusions 13 may be formed on both the upper and lower pieces 9 and 12. Further, the needle-like protrusion 13 may be integrally formed on the inner peripheral surface of the groove 8, or a screw screw having a needle-like tip is screwed into a screw hole formed through the groove 8. May be Furthermore, the sheath of the insulated wire 7 may be stripped off, and the core wire 7b may be entangled with the core wire 4 of the metal binding wire, and a C-shaped or sleeve-shaped connector may be attached and caulked.

The metal binding wire described above is used as follows. First, the insulated wire 7 and the insulator mounting portion 1a at the center of the metal binding wire body 1 are mounted in the head groove 16 of the insulator 15 attached to the grounding metal fitting 14 so that the head groove 16 is sandwiched therebetween, and the insulator mounting portion 1a Wrap the metal binding wire body 1 on both sides around the insulated wire 7 and attach it. After that, the groove 8 of the upper piece 9 of the electrical connector 3 is pressed against the insulated wire 7, the lower piece 12 is aligned, and both (upper and lower pieces 9 and 12) are attached and fixed by the bolts and nuts 11, and on top of that. Insulation cover 17 is applied. Further, the front end portion 6 of the discharge electrode portion 2 which is not covered with the insulating resin 5 is arranged so as to face the tip end of the discharge electrode 19 on the voltage applying side of the current limiting element unit 18 attached to the ground side of the insulator 15.

In the metal bind wire according to the present invention, the discharge electrode 2 is integrally formed at the end of the core wire 4 of the metal bind wire body 1 and has a simple shape. When the wire body 1 is attached to the insulated wire 7, the discharge electrode 2 does not get in the way and the work efficiency of the column mounting is improved. On the other hand, the other end is electrically connected to the insulated wire 7 via the electrical connector 3 and is provided with an insulating cover 17, and the metal binding wire body 1 is electrically coated with the insulating resin 5. It's safe. Further, since the metal binding wire according to the present invention is not provided with the current limiting element unit 18, the current limiting element unit 18 does not always enter the power-on state and there is no fear of deterioration. In addition, it can be doubled together with the conventional metal binding wire, which improves breakage due to vibration of both metal binding wires. Moreover, since the tip of the discharge electrode 2 of the metal binding wire and the tip of the discharge electrode 19 of the current-limiting side of the current limiting element unit 18 attached to the ground side of the insulator 15 are arranged to face each other, abnormal voltage is applied to the insulation wire 7. Even if a flashover occurs, the follow-up arc that flows after that can be limited or interrupted and the insulated wire 7 can be prevented from breaking.

[0018]

[Effect of device]

 As described above, with the metal binding wire with the discharge electrode according to the present invention, the existing simple shape of the discharge electrode can be adopted to improve the workability of the column, and the current limiting element unit is constantly installed. Can be used without turning on electricity. Also, by disposing the tip of the discharge electrode of the metal bind wire and the tip of the discharge electrode of the current-limiting element unit attached to the ground side of the insulator facing each other, even if an abnormal voltage occurs in the insulated wire, a flashover occurs. The subsequent arc that flows after that can be limited or interrupted, and the insulated wire can be prevented from breaking.

[Brief description of drawings]

FIG. 1 is an explanatory view of a metal binding wire with a discharge electrode according to the present invention, in which a is an overall view and b is an X-X sectional view of a.

FIG. 2 is an explanatory view of an implementation state of a metal binding wire with a discharge electrode according to the present invention.

FIG. 3 is a top view of FIG. 2;

[Explanation of symbols]

1: Metal binding wire body 1
a: Insulator mounting part 2: Discharge electrode part 3: Electrical connection tool
4: Core wire 5: Insulating resin 6: Tip
7: Insulated wire 7a: Insulation coating 7b: Core wire
8: Groove 9: Upper piece 10: Both sides of groove 1
1: Bolt / nut 12: Lower piece 13: Needle-like protrusion 1
4: Grounding fitting 15: Insulator 16: Head groove 1
7: Insulation cover 18: Current limiting element unit 19: Discharge electrode on the charging side

Claims (3)

[Scope of utility model registration request] 1. A metal bind wire with a discharge electrode, wherein a discharge electrode is provided at one end of a core wire of a metal bind wire having a grip portion for attaching an insulated wire to a head of an insulator. 2. The metal bind wire with a discharge electrode according to claim 1, wherein the discharge electrode is integrally provided at one end of the core wire of the metal bind wire. 3. The metal bind wire with a discharge electrode according to claim 1, wherein the discharge electrode is welded to one end of the core wire of the metal bind wire.