JPH10247430A - Fixing metal fitting to insulator and current limiting type high-tension clamp insulator using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing metal fitting to an insulator and a current limiting type high-tension clamp insulator in which fixing by a manipulator is possible without influencing an existing wire support insulator. SOLUTION: One pair of embracing hold arms 3 which can elastically embracing hold an insulator base fitting 4 is provided on the inside face of a metal fitting body 1, an L-shaped bending portion 2 is provided at the lower portion of the metal fitting body 1, and an insertion portion into an insulator pin 6 is formed at the tip thereof. The upper portion of this metal fitting is extended toward the opposite side of an insulator and a current limiting unit 14 is fixed thereto, the same is fixed to a wire support insulator 10 with a cap metal fitting 20, and a required gap G is formed between the terminal electrode 16 of the current limiting unit 14 and the cap metal fitting 20 so as to constitute a current limiting type high-tension clamp insulator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting bracket for an insulator used for mounting a current limiting unit or other equipment to the insulator, and a current limiting high pressure clamp insulator using the same.

[0002]

2. Description of the Related Art When a current limiting unit or the like is attached to a wire supporting insulator of an existing high-voltage distribution line, a fitting having a special shape has been conventionally proposed. FIG.
No. 31454 discloses a mounting bracket, in which a current limiting unit 52 is attached to one end of a flat base 51,
The other end of the base 51 is provided with a slit 54 into which the insulator pin 53 can be inserted. However, in order to attach the mounting bracket to the electric wire supporting insulator 55, first, loosen the nut 57 on the lower surface of the arm bar 56 of the electric pole, and loosen the insulator base metal fitting 5.
8 is slightly lifted from the arm bar 56, and the mounting
Must be inserted into this gap from the side, the insulator pin 53 is fitted into the slit 54, and the nut 57 must be tightened again.

[0006] As described above, the mounting bracket of FIG. 6 needs to lift the wire supporting insulator 55 from the arm bar 56 of the telephone pole at the time of mounting. In addition, there is a problem that the operation by the manipulator is difficult because a complicated operation is required for mounting.

[0004] In addition, a mounting bracket in which an openable and closable band bracket is wound around an insulator base bracket and tightened with bolts is described in Japanese Utility Model Publication No. 2-6576. With this type of mounting bracket, there is no need to loosen the wire support insulator, so there is no effect on existing wires. However, it is necessary to perform the work of closing the bolt with the other hand while supporting the band fitting with one hand and adjusting the mounting height, and there is a problem that the work with the manipulator is also difficult.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a mounting bracket for an insulator which can be mounted by a manipulator without loosening a wire supporting insulator, and a current-limiting high-pressure type using the same. This was made to provide a clamp insulator.

[0006]

According to a first aspect of the present invention, an insulator base metal fitting is provided on an inner surface of a metal fitting body having an L-shaped bent portion formed at a lower portion thereof. And a pair of holding arms that can be held by the armature, and an insertion portion into an insulator pin extending downward from the insulator base metal fitting is formed at a tip of the bent portion. According to a second aspect of the present invention, a handle is provided on an outer surface of the metal fitting body of the mounting metal of the first aspect. According to a third aspect of the present invention, a current limiting unit is mounted by extending an upper portion of a fitting body of the mounting fitting according to the first or second aspect to a side opposite to the insulator. Further, according to a fourth aspect of the present invention, the mounting bracket according to the third aspect is attached to an electric wire supporting insulator having a cap metal which is electrically connected by clamping an electric wire, and is provided between the terminal electrode of the current limiting unit and the cap metal. The present invention also provides a current-limiting high-pressure clamp insulator characterized by forming a required discharge gap.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 is a perspective view of a metal fitting for an insulator according to the present invention, wherein 1 is a metal body made of a metal plate, 2 is an L-shaped bent portion formed at a lower portion thereof, and 3 is an inner surface of the metal body 1. Are a pair of holding arms protruding from the arm. The holding arm 3 has a circular arc shape, and has a guide portion 5 whose end portion is slightly extended outward. The insulator base metal fitting 4 shown in FIG.
When pushed from the side of the insulator base, the opening is opened by elasticity, and when passing through the maximum diameter portion of the insulator base fitting 4, the opening is narrowed by elasticity, so that the insulator base fitting 4 can be elastically held.

As shown in FIG. 1, an insertion portion 7 for an insulator pin 6 extending downward from the insulator base metal fitting 4 is formed at the tip of the L-shaped bent portion 2. This insertion portion 7 is bifurcated. Note that the holding arm 3 and the L-shaped bent portion 2 are formed parallel to the same side surface of the bracket main body 1. Reference numeral 8 denotes a pair of handles protruding from the outer surface of the fitting body 1. The handle 8 is provided for gripping the fitting main body 1 by the manipulator. Further, an upper portion of the metal fitting body 1 is a device mounting portion 9 extending to a side opposite to the insulator and separated above the insulator base metal fitting 4.

In order to attach the thus constructed mounting bracket to the electric wire supporting insulator 10 shown in FIG. 2, first, the handle 8 of the bracket main body 1 is held by the manipulator, and the holding arm 3 is held.
Is pushed in from the side of the insulator base fitting 4. Then, the holding arm 3 holds the insulator base fitting 4 by its own elasticity, and is in a temporarily fixed state, so that there is no danger of falling off even if the manipulator releases the handle 8. In this state, the mounting bracket can slide up and down.
1 prevents the fall.

When the metal fitting body 1 is pushed in from the side of the wire supporting insulator 10, a bifurcated insertion portion 7 formed at the tip of the L-shaped bent portion 2 extends below the arm 11 of the utility pole. The insulator pin 6 is engaged. When the width of the arm 11 of the utility pole is small, the spacer 13 may be interposed on the inner surface of the metal fitting body 1. Then, from below the nut 12 that fixes the insulator pin 6 to the arm 11 of the utility pole, a tightening nut 12a is further screwed by a manipulator to fix the bent portion 2 to the insulator pin 6. The mounting bracket slides upward in accordance with the tightening of the tightening nut 12a. At this time, the height of the mounting bracket can be adjusted. In this manner, the mounting bracket of the present invention has an advantage that it can be easily mounted by the manipulator, and it is not necessary to loosen the nut 12 of the wire supporting insulator 10 at the time of mounting.

FIG. 2 shows an embodiment of a current-limiting high-pressure clamp insulator using the above-mentioned mounting bracket. In this case, FIG.
As described above, the current limiting unit 14 is previously mounted on the device mounting portion 9 on the upper part of the fitting main body 1. This current limiting unit 14
For example, as shown in FIG. 3, terminal electrodes 16 and 17 are bonded and fixed to the upper and lower end surfaces of the non-linear resistance element 15, and the outer periphery thereof is covered with an insulating coating 1 such as ethylene propylene rubber or silicon rubber.
8. For bonding and fixing the terminal electrodes 16 and 17, a method of mixing a binder using a powdered glass material or an organic material with silver powder and baking in a heating furnace can be adopted. A plurality of caps 19 are formed on the insulating coating 18 to enhance the insulating performance.

The mounting bracket to which the current limiting unit 14 has been previously mounted is mounted on the wire supporting insulator 10 by the above-described method. The electric wire supporting insulator 10 is provided with a cap fitting 20 which is electrically connected to the electric wire on the head, and a coating removal portion of the insulated electric wire 21 is clamped by the electric wire clamp 22, and the outer periphery thereof is further covered with the insulating cover 23. is there. The height of the mounting bracket is adjusted when attaching to the wire support insulator 10 so that the terminal electrode 16 of the current limiting unit 14 and the wire support insulator 1 are adjusted.
A required discharge gap G is formed between the cap metal 20 and the cap metal 20.

The current limiting type high voltage clamp insulator shown in FIG. 2 flashes over a lightning surge generated at the time of lightning strike to the current limiting unit 14 via the discharge gap G, and grounds from the mounting bracket to the armrest 11 of the utility pole. This is to prevent the electric wire supporting insulator 10 from being damaged by blocking the subsequent flow after the disappearance of the surge and preventing the generation of an arc due to the subsequent flow.

If the lightning surge exceeds the capacity of the current limiting unit 14, the current limiting unit 14 may be destroyed. However, since the equipment mounting portion 9 extending above the metal fitting main body 1 is located at a position higher than the insulator base metal fitting 4, the equipment mounting portion 9 acts as an arcing horn, and the arc due to the continuation flow is located far from the wire supporting insulator 10. Since it is formed, breakage of the wire support insulator 10 is prevented. Therefore, even if the current limiting unit 14 is destroyed, there is no possibility that the wire support insulator 10 will be immediately destroyed by the subsequent lightning surge, and there is an advantage that the maintenance period can be afforded.

FIG. 4 shows a modification of the current limiting type high pressure clamp insulator. In this embodiment, the equipment mounting portion 9 extending upward from the metal fitting main body 1 is bent outward, and the gapless lightning arrester 24 is mounted horizontally. ing. A sheathed lead wire 25 is connected to the tip of the lightning arrester 24, and is attached to the insulated wire 21 by a connector 26. In this case, the lightning arrester 24 is attached in the same direction as the insulated wire 21, but the manipulator holds the handle 8 of the fitting main body 1 and attaches it to the wire support insulator 10 in a direction parallel to the insulated wire 21, thereby ensuring correct attachment. I can do it.

FIG. 5 is a view showing another example of use of the mounting bracket of the present invention. In this example, a measuring instrument body 30 such as an instrument transformer (PT) or an instrument current transformer (CT) is directly attached to the insulated wire 21, and a voltage signal or a current signal is extracted from a signal line 31. However, if only the upper end of the measuring instrument main body 30 is supported by the insulated wire 21, there is a possibility that a load may be applied to the detection unit due to the influence of wire vibration due to wind or the like. Therefore, a thin metal plate 32 is attached to the device mounting portion 9 of the mounting bracket of the present invention, and is fixed to the lower flange 34 of the measuring instrument main body 30 with a screw 33 for fastening. As a result, the measuring instrument body 30
Supports the lower part of the to prevent vibration. In addition, the thin metal plate 3
It is preferable that the flexible portion 35 is formed in 2 so that vibration can be absorbed more effectively.

[0017]

As described above, the mounting bracket for the insulator of the present invention can be automatically mounted by the manipulator without loosening the existing wire supporting insulator, and the height can be easily adjusted. . In addition, the current limiting type high voltage clamp insulator of the present invention can be easily attached to an existing wire supporting insulator, and also, even if the current limiting unit is destroyed by an excessive lightning surge, the wire supporting insulator is immediately damaged. Absent. This allows more time for maintenance,
Therefore, there is an advantage that the discharge withstand capacity of the current limiting unit can be reduced and the economic efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a mounting bracket according to the present invention.

FIG. 2 is a front view of the current limiting type high pressure clamp insulator of the present invention.

FIG. 3 is a partial sectional view of the current limiting unit.

FIG. 4 is a front view of a modification of the current limiting type high pressure clamp insulator of the present invention.

FIG. 5 is a front view of another usage example of the mounting bracket of the present invention.

FIG. 6 is a partial sectional view of a conventional example.

[Explanation of symbols]

1 fitting body, 2 L-shaped bent part, 3 holding arm,
4 Insulator base metal fittings, 5 guides, 6 insulator pins, 7
Insertion part to insulator pin, 8 handle, 9 equipment mounting part, 1
0 wire support insulator, 11 pole pole arm, 12 nut,
12a tightening nut, 13 spacer, 14 current limiting unit, 15 non-linear resistance element, 16 terminal electrode, 17
Terminal electrode, 18 Insulation coating, 19 Cap, 20 Cap fitting, 21 Insulated wire, 22 Wire clamp, 23
Insulation cover, 24 lightning arrester, 25 coated lead wire,
26 connector, 30 measuring instrument body, 31 signal line, 3
2 Thin metal plate 33 Tightening screw, 34 Lower flange, 35 Flexible part

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Kiyoshi Hasegawa 2-56, Sudacho, Mizuho-ku, Nagoya, Aichi Prefecture Inside Nihon Insulators Co., Ltd. (72) Yoshinobu Noda 2-56, Sudacho, Mizuho-ku, Nagoya-shi, Aichi Prefecture No. Japan Insulator Co., Ltd. (72) Inventor Tetsuya Asukai 2-56 Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Japan Insulator Co., Ltd.

Claims (4)

[Claims] 1. A pair of holding arms capable of elastically holding an insulator base metal fitting is provided on an inner surface of a metal fitting body having an L-shaped bent portion formed at a lower portion, and the insulator is provided at a tip of the bent portion. A mounting bracket for an insulator, wherein an insertion portion for an insulator pin extending downward from the base bracket is formed. 2. The mounting bracket for an insulator according to claim 1, wherein a handle is provided on an outer surface of the mounting body. 3. The mounting bracket for an insulator according to claim 1, wherein the current limiting unit is mounted by extending an upper portion of the bracket main body to a side opposite to the insulator. 4. A mounting bracket for an insulator according to claim 3, which is attached to a wire supporting insulator with a cap fitting which is electrically connected by clamping an electric wire, between the terminal electrode of the current limiting unit and the cap fitting. A current limiting high pressure clamp insulator characterized in that a required discharge gap is formed in the insulator.