JPH07254318A - Insulator for conductor - Google Patents

Abstract

PURPOSE:To provide an insulator for a conductor having a simple structure, allowing easy mounting on a bare conductor and having the capability of increasing insulation strength in the air, even when an insulation distance between the conductor and a fitting faced thereto is not sufficient. CONSTITUTION:An insulation cover 2 is formed approximately cylindrical, so as to cover a conductor 3 over the prescribed length. Also, an open section 4 is formed on the external surface of the cover 2, extending along an axial direction, and expanded against the elasticity of the cover 2 for attaching or detaching the cover 2 to and from the conductor 3. In addition, a pair of walls 5 are erected from the external surface of the cover 2 in the vicinity of both sides of the section 4 and used to increase an insulation distance from the conductor 3 to a fitting faced thereto via the section 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire insulator that is used by being attached to an electric wire in order to partially insulate a bare electric wire.

[0002]

2. Description of the Related Art As a conventional lightning protection insulator device, one having a structure as shown in FIGS. 6 to 8 is known. First, in the lightning protection insulator device shown in FIG. 6, a transmission line 13 is supported by a support arm 11 of a steel tower via a pair of tension insulators 12, and a jumper wire 14 is installed between both tension insulators 12. . A lightning protection insulator 15 is supported on the support arm 11, and a grounding side arc horn 16 is attached to the tip thereof. A voltage-side arc horn 17 is attached on the jumper wire 14, and is arranged to face the ground-side arc horn 16 with a predetermined discharge gap G.

Further, in the lightning arrester device shown in FIGS. 7 and 8, the power transmission line 13 is supported by the support arm 11 of the steel tower via the suspension insulator 18. A lightning protection insulator 15 is supported on the support arm 11 via a mounting adapter 19, and a ground side arc horn 16 is mounted on the tip thereof. A charging-side arc horn 17 is attached to the tip of the suspension insulator 18, and is arranged to face the ground-side arc horn 16 with a predetermined discharge gap G therebetween.

[0004]

However, in the case of installing the lightning arrester insulator device on the existing line shown in FIG. 6, the predetermined lightning arrestor insulator 15 and the grounding side arc horn 16 are installed and the discharge gap G is secured. Therefore, there are cases in which the jumper wire 14 has to be installed over the support arm 11 with a large distance L1. in this case,
The jumper wire 14 is disposed close to the other support arm 21, and the insulation distance L2 between the two 14 and 21 is increased.
There is a problem that it is difficult to secure a predetermined value or more.

Further, in another lightning arrester device shown in FIGS. 7 and 8, a mounting adapter 19 is arranged so as to extend largely from the support arm 11. Therefore, even if the support arm 11 is disposed at a predetermined distance L3 from the power transmission line 13 supported by another support arm 11, the tip of the mounting adapter 19 is disposed close to the other power transmission line 13, There is a problem in that it is difficult to secure the insulation distance L4 between the both 19 and 13 above a predetermined distance.

The present invention has been made by paying attention to the problem existing in such a conventional technique for attaching the lightning protection insulator to the existing line. The purpose is to
(EN) Provided is an electric wire insulator which can be easily attached to a bare electric wire and can improve apparently the insulation strength in the air even when the insulation distance between the electric wire and an opposing object is short. Especially.

[0007]

Means for Solving the Problems In order to achieve the above object, in the invention of an electric wire insulating device according to claim 1, a substantially cylindrical insulating coating for covering the electric wire over a predetermined length, An opening formed in the circumferential surface of the insulating cover in the axial direction and capable of widening against the elasticity of the insulating cover when the insulating cover is attached to or detached from an electric wire, and the insulating cover in the vicinity of both sides of the opening. And a barrier provided on the outer peripheral surface.

According to a second aspect of the present invention, in the first aspect of the invention, a pair of the barriers is provided on the outer peripheral surface of the insulating cover near both sides of the opening. Further, in the invention of claim 3, in the electric wire insulator of claim 1, a drainage channel extending in the axial direction is formed on the inner peripheral surface of the insulating cover.

[0009]

When mounting the electric wire insulator according to claim 1 on the electric wire, the opening is widened against the elasticity of the insulating coating,
Attach the insulation cover to the outer circumference of the wire. Then, the opening is arranged on the side opposite to the facing object with respect to the electric wire or at a position rotated by 90 degrees from the position corresponding to the facing object. This allows
The electric wire is partially covered with the insulating cover, and the barrier is arranged in the insulating space extending from the electric wire to the counter object through the opening to increase the insulation distance between the electric wire and the counter object.

According to the second aspect of the present invention, since the pair of barriers are provided in the vicinity of both sides of the opening of the insulating cover, the insulating property of the insulating cover can be improved. Further, when the electric wire insulator of claim 3 is attached to the electric wire, the drainage channel on the inner peripheral surface of the insulating cover is axially extended at the lower outer circumference of the electric wire. Then, rainwater and the like that enter the insulating coating body from both ends and openings of the insulating coating body are discharged to the outside of the insulating coating body along the drainage channel. For this reason, rainwater, etc. collects in the mounting part of the insulator for the electric wire,
It is possible to prevent the possibility of electrolytic corrosion.

[0011]

EXAMPLES A first example of an electric wire insulator embodying the present invention will be described below in detail with reference to FIGS. 1 and 2. Now, the electric wire insulator 1 of this embodiment is, for example, as shown in FIG.
7 is used by being attached to the portion of the lightning insulator device near the support arm 11 or in the portion of the lightning insulator device shown in FIGS.

As shown in FIGS. 1 and 2, the insulating coating 2 of the insulating tool 1 is formed into a substantially cylindrical shape by an elastic insulating material such as polyethylene, ethylene-propylene-diene copolymer (EPDM), or silicone. The bare wire 3 such as the jumper wire or the power transmission line is formed to cover the wire for a predetermined length. The opening 4 is formed on the peripheral surface of the insulating cover 2 and extends along the axial direction over the entire length. Then, when the insulating cover 2 is attached to or detached from the bare wire 3, the insulating cover 2 is deformed against the elasticity so that the opening 4 can be widened.

A pair of barriers 5 are formed on the outer peripheral surface of the insulating cover 2 in the vicinity of both sides of the opening 4, and extend in parallel to both sides of the insulating cover 2 along the opening direction of the opening 4. The drainage channel 6 is formed in a concave shape on the inner peripheral surface of the insulating cover 2 and extends over the entire length in the axial direction. And
When the insulation coating 2 is attached to the bare wire 3, the drainage channel 6
Are arranged so as to extend in the axial direction on the outer periphery of the lower portion of the bare wire 3.

When the insulation 1 for the electric wire is mounted on the bare electric wire 3, the opening 4 is widened against the elasticity of the insulating covering 2 so that the insulating covering 2 is placed at a predetermined position on the bare electric wire 3. Attach to the outer periphery of. Then, the opening 4 is arranged at a position opposite to the facing object such as a support arm or a mounting adapter for the bare wire 3, or at a position rotated by 90 degrees from the position corresponding to the facing object. Therefore, the structure of the insulating tool 1 is simple and
The insulating tool 1 can be easily attached to the bare wire 3.

In the mounted state of the insulating tool 1, the portion of the bare wire 3 corresponding to the opposite object is insulated and covered by the insulating cover 2. A barrier 5 is arranged in the insulating space from the bare wire 3 through the opening 4 to the opposite object,
As a result, the insulation distance between the bare wire 3 and the opposing object is increased, and the insulation strength in the air is improved. Therefore, even when the insulation distance between the bare wire 3 and the opposing object is short, as in the lightning arrester device shown in FIGS. 6 to 8, the insulation property on the bare wire 3 side can be improved. Moreover, since the bare electric wire 3 is covered with the insulating cover 2, even if the wires or the like collected by the bird for nesting may fall onto the electric wire 3, it is possible to prevent a short circuit accident or the like. Can be prevented.

Further, when the insulating tool 1 is mounted, the drainage channel 6 on the inner peripheral surface of the insulating cover 2 is axially extended on the lower outer periphery of the bare wire 3. When rainwater or the like enters the insulation coating 2 from both ends of the insulation coating 1 or the opening 4, the rainwater or the like is smoothly discharged to the outside of the insulation coating 2 along the drainage channel 6. Therefore, it is possible to reliably prevent the possibility that rainwater or the like will accumulate in the mounting portion of the insulating tool 1 on the bare wire 3 and cause electrolytic corrosion.

[0017]

Another Embodiment Next, another embodiment of the electric wire insulator 1 embodying the present invention will be described with reference to FIGS. First, in the second embodiment shown in FIGS. 3 and 4,
When the insulation coating 2 is attached to the bare wire 3, the opening 4 is located at the outer periphery of the lower portion of the bare wire 3 so as to also serve as a drainage channel. Further, a pair of barriers 5 are formed in the vicinity of both sides of the opening 4 so as to project from the outer periphery of the insulating cover 2 toward only one side. Therefore, also in the second embodiment, it is possible to exhibit substantially the same operational effects as in the case of the first embodiment described above.

Further, in the second embodiment, the conductive sponge 7 is provided on the inner peripheral surface of the insulating cover 2 and the top edge portion thereof is adhered to the insulating cover 2 with an adhesive. The conductive sponge 7 is filled with insulating grease on both side edges. Therefore, when the insulating tool 1 of this embodiment is attached to the bare electric wire 3, the inner peripheral surface of the insulating coating 2 is brought into close contact with the outer peripheral surface of the bare electric wire 3 via the conductive sponge 7, and the outer circumference of the bare electric wire 3 Discharge between the surface and the inner peripheral surface of the insulating cover 2 is prevented. In addition, in the mounted state of the insulating tool 1, the insulating grease enhances the insulating property of the bare wire 3.

Next, in the third embodiment shown in FIG.
The insulating cover 2 is formed in a spiral shape in cross section, and is attached to the outer periphery of the bare wire 3 in a state where the opening edges are overlapped with each other. In addition, a pair of barriers 5 are formed in the vicinity of both sides of the opening 4 so as to protrude in the radial direction from the outer periphery of the insulating cover 2. Further, a plurality of drainage channels 6 are formed on the inner peripheral surface of the insulating cover 2 at predetermined intervals. Therefore, also in the third embodiment, it is possible to exhibit substantially the same operational effects as in the case of the first embodiment described above.

The present invention is not limited to the configuration of the above-mentioned embodiment, and can be embodied by changing the configuration as follows, for example. (A) In the first embodiment shown in FIGS. 1 and 2, the pair of barriers 5 are formed so as to project from the outer periphery of the insulating cover 2 toward only one side in the vicinity of both sides of the opening 4. (B) In each of the first to third embodiments, the both ends of the insulation coating body 2 are clamped and fixed to the bare wire 3 by the insulating bolts in a state where the insulation coating body 2 is attached to the bare wire 3. To do. (C) The barrier 5 should be provided only on one side near the opening 4.

Further, technical ideas other than the claims grasped from each of the embodiments will be described below together with their effects. (1) The electric wire insulator according to claim 1, wherein a soft layer that is in close contact with the outer circumference of the electric wire is provided on the inner peripheral surface of the insulating cover. With this configuration, it is possible to prevent discharge between the insulating cover and the electric wire. (2) The electric wire insulating tool according to claim 1, wherein the insulating coating is provided with irregularities on the inner peripheral surface thereof, and the irregularities are combined with the irregularities associated with the twisting of the electrical wire. With this configuration, the rotation of the insulating tool can be effectively prevented.

[0022]

Since the present invention is configured as described above, it has the following excellent effects. According to the invention of claim 1, the structure is simple and can be easily attached to the bare electric wire, and even when the insulation distance between the electric wire and the opposing object is insufficient, the insulation strength in the air can be improved. .

According to the second aspect of the invention, the insulating property of the insulating coating can be further improved. Further, according to the invention of claim 3, it is possible to prevent the possibility that rainwater or the like is accumulated in the mounting portion of the insulating tool with respect to the electric wire to cause electrolytic corrosion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a first embodiment of an electric wire insulator embodying the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view of an essential part showing a second embodiment of an electric wire insulator embodying the present invention.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a cross-sectional view of essential parts showing a third embodiment of an electric wire insulator embodying the present invention.

FIG. 6 is a front view of a lightning arrester device showing a usage mode of an electric wire insulator of these examples.

FIG. 7 is a perspective view of a lightning arrester device showing another usage mode of the wire insulator.

8 is a front view of the lightning protection insulator device of FIG. 7. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Insulator for electric wire, 2 ... Insulating cover, 3 ... Bare electric wire, 4 ...
Opening, 5 ... Barrier, 6 ... Drainage channel.

Claims (3)

[Claims] 1. A substantially cylindrical insulating coating that covers an electric wire over a predetermined length, and an insulating coating that is formed on the peripheral surface of the insulating coating in the axial direction to extend when the insulating coating is attached to or removed from the electric wire. An electric wire insulator comprising an opening that can be widened against the elasticity of the covering, and barriers that project from the outer peripheral surface of the insulating covering near both sides of the opening. 2. The electric wire insulator according to claim 1, wherein a pair of the barriers is provided on the outer peripheral surface of the insulating cover near both sides of the opening. 3. The electric wire insulator according to claim 1, wherein a drainage channel extending in the axial direction is formed on the inner peripheral surface of the insulating cover.