JPH1012068A - Protective apparatus for insulated coated electric wire from disconnection by lightning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive protective apparatus for prevention of disconnection due to lightning by simplifying the structure of the apparatus and lessen the number of parts and improve the workability. SOLUTION: An insulating cover 28 which can be opened and closed and is produced by pivoting an upper cover 26 and a lower cover 27 with a hinge part 30 is so installed as to wrap an insulated and coated electric wire 3 from the upper and the lower side and an electric side horn 39 installed in the lower cover 27 of the insulating cover 28 is electrically connected with a core wire 22 of the insulated coated electric wire 3 and in this cover 28, the electric side horn 39 comprises a metal member 43 having a conductor blade part 40 which pierces the coating part 21 of the insulated coated electric wire 3 at the part to be brought into contact with the core wire 22 and a discharge recessed hole opened at the base end part and an insulating outer coating part 48 having a head part outer shape conformed to an exclusive installation tool is unitedly formed on the base end part of the metal member 43 and the metal member 43 is joined with the lower cover 27 of the insulating cover 28 by screwing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning break protection device for an insulated wire, and more particularly, to a lightning break protection device for preventing the vicinity of an insulator provided on the insulated wire from being blown by a subsequent flow after a lightning strike. Related to the device.

[0002]

2. Description of the Related Art As a lightning disconnection protection device for preventing the vicinity of an insulator provided on an insulated wire from being melted by a subsequent flow after a lightning strike, for example, a device disclosed in Japanese Utility Model Laid-Open Publication No. 2-31945 is disclosed. is there.

In this type of lightning disconnection protection device, when an overvoltage due to a lightning surge flashes over an insulated wire that is a distribution line, the following current is suppressed and cut off, and the main line on the high voltage side is disconnected by the following arc. The element-side horn is attached to the grounded object via a current-limiting element unit with non-linear voltage-current characteristics to prevent damage to the insulator and the insulator, and this is opposed to the insulated wire covered by the insulator with an air gap. It has a structure.

More specifically, this lightning disconnection protection device has a configuration as shown in FIG. An insulator 2 is attached to an arm 1 that is horizontally fixed to a utility pole (not shown).
Is bound to the insulated wire 3 by a bind wire 4. A current limiting element unit 7 having a current limiting element 6 having a non-linear current-voltage characteristic is mounted in an upright state at the tip of a support arm 5 extending from the arm 1 located at the lower end of the insulator 2. .

The current limiting element unit 7 has a configuration in which a current application side electrode 8 and a ground side electrode 9 are joined to the upper and lower sides of a current limiting element 6 and are integrally molded with an elastic insulator 10 covering these. The ground-side electrode 9 of the current-limiting element unit 7 is electrically connected to the support arm 5, and the power-supply-side electrode 8 is electrically connected to the element-side horn 11 of a conductor that projects horizontally from the upper end of the current-limiting element unit 7. Connected. The element-side horn 11 extending from the current limiting element unit 7 is arranged below the insulated wire 3.

On the other hand, the horn 11 on the element side of the insulated wire 3
A wire-side horn unit 12 having the following configuration is attached to a portion corresponding to the above. The wire-side horn unit 12 includes a pair of upper and lower covers 1 that can be opened and closed by hinges (not shown) as shown in FIG.
It has a cylindrical insulating cover 15 made of 3 and 14, and has a structure in which the insulating cover 15 is attached to the insulated wire 3 via an insulating compound 16.

[0007] An insulating base 17 is screwed into the lower cover 14 of the insulating cover 15, and a wire-side horn 19 is press-fitted into the upper end of a discharge hole 18 formed through the insulating base 17. Electrode sleeve 20 is mounted. The threaded portion of the wire-side horn 19 located in the electrode sleeve 20 is cut into the covering portion 21 of the insulated wire 3 to make electrical contact with the core wire 22. On the other hand, the insulating base 1
7 is connected to the element-side horn 1 of the current limiting element unit 7 described above.
1 and the air gap 23.

In this lightning disconnection protection device, when an overvoltage due to a lightning strike is applied to the insulated wire 3, the discharge of the insulating base 17 from the discharge end of the wire side horn 19 in contact with the core wire 22 of the insulated wire 3. It flashes over through the hole 18 and is captured by the element-side horn 11, and thereafter, via the power-supplying-side electrode 8, the current-limiting element 6, the grounding-side electrode 9, the support arm 5 and the arm 1 of the current limiting element unit 7. And the subsequent flow is suppressed and cut off, thereby preventing disconnection or the like due to the following current arc.

[0009]

By the way, in the conventional lightning disconnection protection device, the wire-side horn unit 12 provided on the insulated wire 3 has the lower cover 14 constituting the insulating cover 15 attached to the insulating cover 15 as described above. An electrode sleeve 2 in which a base 17 is screwed and an electric wire side horn 19 is press-fitted to the upper end of a discharge hole 18 formed through the insulating base 17.
0 is attached. As described above, since the wire-side horn unit 12 is composed of the insulating base 17, the electrode sleeve 20, and the wire-side horn 19, the number of parts is large, and it is difficult to reduce the cost. There is a problem in that it is difficult to assemble the components including the insulating member 19 into the insulating cover 15, and it is difficult to perform a quick and smooth operation.

Therefore, the present invention has been proposed in view of the above-mentioned problems, and an object thereof is to reduce the number of parts and improve workability with a simple structure, and to provide an inexpensive lightning disconnection protection device. Is to provide.

[0011]

According to the present invention, there is provided an insulator for supporting an insulated wire, comprising a current limiting element having a non-linear current-voltage characteristic. A flow element unit is attached, an element-side horn is extended from the current-limiting element unit, and a wire-side horn unit in which the wire-side horn is mounted on an insulating cover is attached to the insulated wire. In a state in which the element-side horn extending from the current-limiting element unit is opposed to the element-side horn via the air gap in a state where the electric-side horn is electrically connected to the element, the wire-side horn bites into a coating portion of the insulated wire at the tip end. It is made of a metal member formed by opening a discharge recess at the base end, and has a head outer shape matching the dedicated mounting tool at the base end of the metal member. Have integrally deposited and formed a structure of Engai the parts, characterized in that the metal member is screwed to the opposing part of the element side horn insulating cover.

[0012]

1 to 5 show an embodiment of the present invention.
And will be described. The same or corresponding parts as those in FIGS. 6 and 7 are denoted by the same reference numerals.

The lightning disconnection protection device of the present invention has a configuration as shown in FIG. As in the prior art, an insulator 2 is attached to an arm bar 1 horizontally fixed to a power pole (not shown), and the upper end of the insulator 2 is bound to an insulated wire 3 by a bind wire 4. A current limiting element unit 6 having a current limiting element 61 having a non-linear current-voltage characteristic is provided at the tip of a support arm 5 extending from the arm 1 located at the lower end of the insulator 2.
2 is mounted by bolts 63 in an upright state.

The current limiting element unit 62 accommodates the current limiting element 61 in an insulating cylinder 64 made of FRP,
A power application side electrode 65 (hereinafter, referred to as an upper electrode) and a ground side electrode 66 (hereinafter, referred to as a lower electrode) are fitted into the openings at both ends of the battery and fixed with pins 67, and the upper electrode 65 and the current limiting element. A compression spring 68 is inserted between the first and second electrodes 61 and 61 in order to obtain a good connection between the electrodes 65 and 66 and the current limiting element 61. An element-side horn 69 is provided at the upper end of the upper electrode 65.
Are attached, the electrodes 65 and 66 and the insulating tube 64 are attached.
Is covered with an insulating jacket 70. The lower electrode 66 of the current limiting element unit 62 is electrically connected to the support arm 5, and the upper electrode 65 is connected to the current limiting element unit 62.
Is electrically connected to the element-side horn 69 of the conductor extending from the upper end of the horn. The element-side horn 69 extending from the current limiting element unit 62 is arranged below the insulated wire 3.

On the other hand, the horn 69 on the element side of the insulated wire 3
The wire-side horn unit 25 having the following configuration is attached to a portion corresponding to the above. The feature of the present invention resides in the wire-side horn unit 25. The wire-side horn 39 attached to the wire-side horn unit 25 is:
The device-side horn 69 is disposed to face the air-conditioning device via the air gap 23.

That is, the wire-side horn unit 25 of the present invention
Is a pair of upper and lower covers 26, as shown in FIG.
27, and a structure in which the insulating cover 28 is attached to the insulated wire 3 via a gel-like insulating compound (not shown).

This insulating cover 28 is shown in FIGS.
As shown in the figure, the upper and lower covers 26 and 27 have a hinge portion 30 which is pivotally attached to one side edge of the upper and lower covers 26 and 27 so that the shaft core 29 can be opened and closed, and the upper and lower covers 26 and 27 are opened and closed on the other side edge. A detachable unit 31 is provided. The attachment / detachment portion 31 includes, for example, a plurality of projections 32 formed on the side edge of the upper cover 26 and a square hole 33 formed in the side edge of the lower cover 27 so as to correspond to the projection 32. A concave portion 34 for storing the bind wire 4 wound around the insulated wire 3 is formed on the inner surfaces of the upper and lower covers 26 and 27.

At the center of the lower cover 27 of the insulating cover 28, a cylindrical portion 35 projecting downward is integrally formed, and a wire-side horn 39 is mounted on the cylindrical portion 35. A mounting hole 36 is formed through the cylindrical portion 35 in a direction perpendicular to the direction in which the insulated wire 3 extends. The mounting hole 3
Reference numeral 6 denotes a small-diameter portion 37 which is opened on the inner side surface of the lower cover 27 and is provided with a female screw, and a large-diameter portion 38 which communicates with the small-diameter portion 37 and opens on the outer peripheral surface of the lower cover 27.

On the other hand, as shown in FIG. 4, the electric wire side horn 39 has a conductor blade portion 40 at the tip portion that cuts into the covering portion 21 of the insulated wire 3 and comes into contact with the core wire 22 (see FIG. 2). A sharp circular cutting edge 41 is provided at the tip of the conductor cutting portion 40.
And a metal member 43 made of, for example, copper and formed by opening a discharge concave hole 42 at the base end. In addition, the conductor blade 40
Is formed with a concave pore 44 which is open to the circular cutting edge 41. On the outer peripheral surface of the metal member 43, a male screw portion 45 is formed which is screwed with a female screw cut in the small diameter portion 37 of the mounting hole 36 of the cylindrical portion 35 of the lower cover 27. Further, a flat knurl groove 46 extending along the axial direction and a concave groove 47 extending along the radial direction are engraved on the entire outer periphery of the base end portion in order to improve the biting of the resin material of the insulating jacket portion 48. Is done.

This wire-side horn 39 is shown in FIG.
As shown in (b), at the base end of the metal member 43 described above,
An insulating resin material such as an epoxy resin is molded by a mold or the like to integrally form an insulating outer cover 48. This insulating jacket portion 48 is formed by the cylindrical portion 3
5 includes a flange portion 49 housed and arranged in the large-diameter portion 38 and a head portion 50 protruding from the cylindrical portion 35 and exposed (see FIG. 2). , For example, a hexagonal bolt head shape.

In the illustrated electric wire side horn 39, the metal member 43 is exposed in the deep portion of the discharge concave hole 42. However, the rainwater or the like may enter the discharge concave hole 42 and corrode the metal member 43. An insulating film (not shown) thin enough to allow discharge is formed in a portion of the insulating jacket portion 48 corresponding to the deep portion of the discharge recessed hole 42 in consideration of the water resistance and the like for preventing the occurrence of the discharge. It is also possible to form the insulating film at the opening of the discharge recess 42 of the insulating jacket 48.

To attach the wire-side horn unit 25 having the above-described structure to the insulated wire 3, first, the insulating cover 28 is attached to a predetermined portion of the insulated wire 3 corresponding to the element-side horn 69. When the insulating cover 28 is attached, the upper cover 26 and the lower cover 27
Is closed from the open state with the center as the center to hold the insulated wire 3 from above and below, and the protrusion 3
2 is fitted into the square hole 33 of the lower cover 27 and locked. At this time, the bind wire 4 wound around the insulated wire 3 is connected to the upper and lower covers 26 and 27.
The gap between the insulated wire 3 and the insulating cover 28 is filled with an insulating compound (not shown).

Next, the wire side horn 39 is attached to the lower cover 27.
Is attached to the cylindrical portion 35. With the head 49 of the insulating jacket 48 attached to the dedicated mounting tool, the male screw portion 45 of the metal member 43 is screwed into the small diameter portion 37 of the mounting hole 36 of the cylindrical portion 35 using the dedicated mounting tool. Screwed together. At this time, the conductor blade portion 40 of the metal member 43 bites into the coating portion 21 of the insulated wire 3 by the circular cutting edge 41 at the tip thereof, and comes into contact with the core wire 22. At this time, the covering portion 21 of the insulated wire 3 is inserted into the concave pore 44 opening to the circular cutting edge 41.
Is fitted, and the circular cutting edge 41 can bite smoothly.

When the conductor blade portion 40 is in contact with the core wire 22 of the insulated wire 3, the conductor blade portion 40 is made of copper which is relatively soft. 22 and the contact area with
Contact resistance can be reduced and reliable electrical connection can be achieved.

The circular cutting edge 41 of the illustrated conductor cutting portion 40 has a pointed shape whose outer diameter is reduced, but other than this, for example, a circular pointed edge having a pointed shape whose diameter is increased. In this case, the circular cutting edge 41 is crushed outward in a state of contact with the core wire 22 of the insulated wire 3, so that the contact area with the core wire 22 is increased, and the cutting edge is formed. It also has the effect of prevention.

In this lightning disconnection protection device, when an overvoltage due to a lightning strike is applied to the insulated wire 3, the conductor blade portion 40 contacts the core wire 22 of the insulated wire 3, and the back of the discharge recess 42 of the metal member 43. Flashover from the portion through the discharge concave hole 42 and is captured by the element side horn 69, and thereafter, the upper electrode 65 of the current limiting element unit 62 and the current limiting element 6
1, the lower electrode 66, the support arm 5, and the arm 1 are grounded, and the subsequent flow is suppressed and cut off, so that disconnection or the like due to the downstream arc is prevented.

In the above-described embodiment, the insulating cover 2
8 and the upper cover 26 and the lower cover 27
Although the description has been given of the case where the structure can be opened and closed by pivoting at 0, the present invention is not limited to this, and a half-split structure including an upper cover and a lower cover which can be separated independently of each other may be used. It is possible.

[0028]

According to the present invention, the wire-side horn is directly attached to the insulating cover of the wire-side horn unit, and the wire-side horn is formed as an integral body formed by attaching an insulating jacket to a metal member. With a simple configuration consisting of an insulating cover and a wire-side horn, sufficient insulation can be ensured at portions other than the discharge site, the number of parts can be reduced, and costs can be reduced. The wire-side horn can be easily attached to the cover, greatly improving workability.

[Brief description of the drawings]

FIG. 1 is a front view showing the overall configuration of a lightning disconnection protection device for an insulated wire according to the present invention.

FIG. 2 is a sectional view showing a state in which the wire-side horn unit of FIG. 1 is mounted on an insulated wire;

3A is a plan view showing a state in which an insulating cover constituting a part of the wire-side horn unit is opened, and FIG. 3B is a side view of FIG.

FIG. 4 is a front view showing a metal member of a wire-side horn, including a partial cross-section.

5 (a) is a front view including a partial cross section showing a wire-side horn in which an insulating jacket is formed on the metal member of FIG. 4; FIG. 5 (b) is a bottom view of FIG. 4 (a)

FIG. 6 is a front view showing the entire configuration of a conventional lightning disconnection protection device for an insulated wire;

FIG. 7 is an enlarged front view of a main part including a partial cross section showing the electric wire side horn unit of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 insulator 3 insulated wire 25 wire-side horn unit 28 insulating cover 39 wire-side horn 40 conductor blade part 42 discharge concave hole 43 metal member 48 insulating sheath part 61 current limiting element 62 current limiting element unit 69 element-side horn

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[Procedure amendment]

[Submission date] July 5, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011]

According to the present invention, there is provided an insulator for supporting an insulated wire, comprising a current limiting element having a non-linear current-voltage characteristic. A flow element unit is attached, an element-side horn is extended from the current-limiting element unit, and a wire-side horn unit in which the wire-side horn is mounted on an insulating cover is attached to the insulated wire. In a state in which the element-side horn extending from the current-limiting element unit is opposed to the element-side horn via the air gap in a state where the electric-side horn is electrically connected to the element, the wire-side horn bites into a coating portion of the insulated wire at the tip end. It is made of a metal member formed by opening a discharge recess at the base end, and has a head outer shape matching the dedicated mounting tool at the base end of the metal member. Have integrally deposited and formed a structure of Engai the parts, characterized in that the metal member is screwed to the opposing part of the element side horn insulating cover. Also book
The wire-side horn according to the invention is a discharge hole of a metal member.
Characterized by forming an insulating film thin enough to discharge
And a metal member on which the insulating film is formed.
Has a sharp circular cutting edge at the tip of the shaved conductor blade
It is characterized by the following.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

[0028]

According to the present invention, the wire-side horn is directly attached to the insulating cover of the wire-side horn unit, and the wire-side horn is formed as an integral body formed by attaching an insulating jacket to a metal member. With a simple configuration consisting of an insulating cover and a wire-side horn, sufficient insulation can be ensured at portions other than the discharge site, the number of parts can be reduced, and costs can be reduced. The wire-side horn can be easily attached to the cover, greatly improving workability. Ma
In addition, discharge is possible in the discharge concave hole of the metal member of the wire side horn.
If a thin insulating film is formed, corrosion by rainwater etc.
Can prevent corrosion and ensure corrosion resistance.
In addition to this, a sharp tip is attached to the tip of the conductive blade portion of the metal member.
Providing a sharp circular cutting edge makes it easy to insulate coated wires
Bite is possible, and workability can be improved.

Claims (1)

[Claims] A current limiting element unit having a current limiting element having a non-linear current-voltage characteristic is attached to an insulator supporting an insulated wire, and an element-side horn is extended from the current limiting element unit. An element-side horn extending from the current-limiting element unit in a state where the wire-side horn unit in which the wire-side horn is attached to the insulating cover is attached to the insulated wire, and the wire-side horn is electrically connected to the insulated wire. The wire-side horn has a conductor blade portion that cuts into the covering portion of the insulated wire at the distal end and comes into contact with the core wire, and a discharge concave hole at the base end portion. A metal member formed by being opened, having a structure in which an insulating jacket portion having a head outer shape matched with a dedicated mounting tool is integrally formed on a base end portion of the metal member, and the metal member is Insulated hippopotamus Lightning disconnection protection device insulated wire, characterized in that screwed to the opposing part of the element-side horn.