JP2007014123A - Insulated conductor covering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulated conductor covering device that is satisfactory in workability and insulating performance. <P>SOLUTION: The insulated conductor covering device 10 is so constructed that the following are implemented: an elastic insulating sheet is wrapped around a jumper wire 1 so that it overlaps in the circumferential direction 39, and thus an insulating cylindrical body 30 is formed; the overlapped portion 31 is provided with a temporarily fastening function and the overlapped portion 31 is coated with insulating adhesive. The structure 35 of temporary fastening is obtained by forming a recess 23, extending in the direction of length of the insulating cylindrical body 30 in the inner surface of the outer insulating sheet 33 at the overlapped portion 31; and forming a projection 24 extending in the direction of length of the insulating cylindrical body 30, on the outer surface of the inner insulating sheet 32 at the overlapped portion 31. The recess 23 and the projection 24 can be fit together. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an insulated wire cover device for preventing a ground fault or the like due to bird damage in a transmission line, and particularly to an insulated wire cover device having good workability and good insulation performance.

In an overhead power transmission line, a ground fault may occur between a jumper line of a bare transmission line installed on a steel tower and a steel tower member mainly due to birds and beasts. One way to prevent this is to insulate jumper wires.
In order to insulate the jumper wire, as a first example, as shown in FIG. 5, there is a method of winding an insulating sheet 52 having a required width around the jumper wire 51 (see, for example, Patent Document 1). This is the end of winding of the sheet 52.
As a second example, there is a method in which a self-bonding insulating tape 72 is overlapped and wound around a jumper wire 71 as shown in FIG. 6 (for example, see Patent Document 2). Specifically, insulators 62 and 63 are suspended from the arm member 61 of the steel tower, and a jumper wire 71 is installed between the ends of the insulators 62 and 63 via the retaining clamps 64 and 65. And the drain plug 73 which has the drain hole 74 is attached to the lowest part of the jumper wire 71, and the insulating tape 72 is wound around parts other than the part to which the drain plug 73 is attached among the jumper wires 71. Yes.
Japanese Utility Model Publication No. 5-74131 JP 2002-300708 A

However, in the first example described above, in order to secure a creeping flash (flashover) distance in the circumferential direction of the insulating sheet 52 wound around the jumper wire 51, the insulating sheet 52 needs to be wound in a spiral shape. Therefore, there is a problem that the amount of the insulating sheet 52 used is increased, and when the insulating sheet 52 having a high hardness is used, it is not easy to process the insulating sheet 52 into a spiral shape.
In the second example described above, it is necessary to wrap the insulating tape 72 around the jumper wire 71 with the adhesive layer while peeling the release paper covering the adhesive layer (not shown) of the insulating tape 72. The work efficiency is very poor, and there is a problem that insulation failure occurs if the insulating tape 72 is not sufficiently overlapped.
Therefore, the problem to be solved by the present invention is to provide an insulated wire cover device having good workability and good insulation performance.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that an insulating cylindrical body is formed around a power transmission line such as a jumper line so as to overlap in the circumferential direction, and the overlapping portion is formed. The insulated wire cover device is characterized by having a temporary fastening function and an insulating adhesive applied to the overlapping portion.
Thereby, an insulation cylindrical body can be formed with the said insulation sheet so that it may overlap in the circumferential direction around power transmission lines, such as a jumper line, using the elasticity of an insulation sheet. Then, by applying an insulating adhesive to the overlapping portion and bonding it, the withstand voltage in the circumferential direction of the overlapping portion can be improved, and the circumferential flashing of the overlapping portion can be prevented. Furthermore, since the overlapping portion has a temporary fixing function, the overlapping portion can be temporarily fixed until the insulating adhesive applied to the overlapping portion is cured.

Furthermore, the invention according to claim 2 is the insulated wire cover device according to claim 1, wherein the temporary fixing function extends in the longitudinal direction of the insulating cylindrical body on the inner surface of the outer insulating sheet of the overlapping portion. Insulation characterized in that a concave portion is formed, a convex portion extending in a longitudinal direction of the insulating cylindrical body is formed on an outer surface of the inner insulating sheet of the overlapping portion, and the concave portion and the convex portion can be fitted. It is an electric wire cover device.
Accordingly, in the concave portion formed to extend in the longitudinal direction of the insulating cylindrical body on the inner surface of the outer insulating sheet of the overlapping portion, in the longitudinal direction of the insulating cylindrical body on the outer surface of the inner insulating sheet of the overlapping portion. The overlapping portion can be temporarily fixed by fitting a convex portion formed to extend.

Furthermore, the invention according to claim 3 is the insulated wire cover device according to claim 1 or 2, wherein a protrusion extending in a longitudinal direction of the insulating cylindrical body is provided at a lower portion of the inner peripheral surface of the insulating cylindrical body. A drainage gap is formed between the power transmission line and the insulating cylindrical body, a hole is provided in a lower portion of the inner peripheral surface of the insulating cylindrical body, and a drainage pipe for drainage is connected to the hole. This is an insulated wire cover device.
Thereby, the water in the said insulation cylindrical body can flow out from a drain pipe through the clearance gap for drainage produced between the said power transmission line and the internal peripheral surface of the said insulation cylindrical body.

According to the first aspect of the present invention, a bare transmission line such as a jumper line can be efficiently covered with the tubular insulated wire cover device. For this reason, it is possible to prevent a ground fault of a transmission line from occurring due to contact of bird nesting material, snakes, trees, and the like.
Furthermore, according to the invention described in claim 2, together with the effect of the invention described in claim 1, it is possible to easily realize the temporary fixing function of the overlapping portion of the insulated wire cover device.
Furthermore, according to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, it is possible to prevent water from collecting in the insulated wire cover device. It can prevent that an electric wire corrodes with water.

  Embodiments of the present invention will be described below with reference to the drawings. 1 shows a cross section of a cylindrical insulator used in an insulated wire cover device according to an embodiment of the present invention, FIG. 2 shows a cross section of the insulated wire cover device according to an embodiment of the present invention, and FIG. FIG. 4 shows a BB cross section of the drain pipe of FIG.

The cylindrical insulator 20 shown in FIG. 1 is used as a material for the insulated wire cover device 10 shown in FIG. Specifically:
The cylindrical insulator 20 is a synthetic resin whose material is elastic and insulative, for example, silicone rubber, and its thickness is, for example, 5 mm. Silicone rubber has a relative dielectric constant of about 3 and is excellent in heat resistance and weather resistance. A recess 23 and a protrusion 25 are formed on the inner surface 21 of the cylindrical insulator 20. On the other hand, a convex portion 24 is formed on the outer surface 22 of the cylindrical insulator 20. The concave portion 23, the convex portion 24, and the protrusion 25 are formed so as to extend in the longitudinal direction of the cylindrical insulator 20 (direction perpendicular to the paper surface of FIG. 1). Since the cylindrical insulator 20 is formed by, for example, extrusion molding, the concave portion 23, the convex portion 24, and the projection 25 can be easily formed.
The cylindrical insulator 20 is used by being cut at a cutting point 26 (extending in a direction perpendicular to the paper surface of FIG. 1). The cylindrical insulator 20 is recessed as viewed from the “center O of the cylindrical insulator 20”. Reference numeral 23 denotes a position rotated by an angle α counterclockwise from the cutting point 26, and the convex portion 24 is a position rotated by an angle β clockwise from the cutting point 26. Further, a protrusion 25 is formed at a position rotated by an angle “180 ° − (β + γ)” clockwise from the convex portion 24. Here, for example, α is 15 °, β is 60 °, and γ is 20 °.

  As shown in FIG. 2, in the insulated wire cover device 10, an insulating sheet (cylindrical insulator 20 in FIG. 1 is cut at a cutting point 26 around the jumper wire 1 (for example, a wire diameter of about 28.5 mm). The insulating cylindrical body 30 is formed so as to overlap in the circumferential direction 39, and an insulating adhesive is applied to the bonding portion 34 where the inner insulating sheet 32 and the outer insulating sheet 33 of the overlapping portion 31 overlap. Are attached. The overlapping portion 31 occupies ¼ of the entire circumference in the circumferential direction 39 of the insulating cylindrical body 30, for example. The insulating adhesive is, for example, liquid silicone (RTV rubber).

  And the recessed part 23 of the inner surface 21 (refer FIG. 1) of the outer side insulation sheet 33 of the overlap part 31 is arrange | positioned in parallel with the jumper wire 1, and the convex part of the outer surface 22 (refer FIG. 1) of the inner side insulation sheet 32 of the overlap part 31 24 is arranged in parallel with the jumper wire 1 and constitutes a temporary fastening structure 35 into which the concave portion 23 and the convex portion 24 can be fitted. In addition, the recessed part 23, the convex part 24, and the protrusion 25 are extended in the longitudinal direction (direction perpendicular to the paper surface of FIG. 2) of the insulating cylindrical body 30.

Further, since the protrusion 25 (see FIG. 1) on the lower part of the inner peripheral surface 36 of the insulating cylindrical body 30 is arranged in parallel with the jumper wire 1, it is used for drainage between the power transmission line 1 and the insulating cylindrical body 30. A gap 38 is formed. A hole 37 is provided in the lower part of the inner peripheral surface 36 of the insulating cylindrical body 30, and a drain pipe 40 for drainage is connected to the hole 37.
Specifically, as shown in FIG. 3 and FIG. 4, the base 41 of the drain pipe 40 is formed to be thicker than the portion other than the base 41 of the drain pipe 40, whereby the withstand voltage of the base 41 is increased. It has improved. Further, a flange portion 42 is formed integrally with the base portion 41. The flange portion 42 is bonded to the lower portion of the insulating cylindrical body 30 with an insulating adhesive. In this case, the insulating adhesive may be the same adhesive as that applied to the overlapping portion 31.

The insulated wire cover device 10 having the above configuration has the following effects.
Using the elasticity of the insulating sheet, the insulating cylindrical body 30 can be formed by the insulating sheet so as to overlap the jumper wire 1 in the circumferential direction 39. Then, by applying an insulating adhesive to the overlapping portion 31 and bonding it, the withstand voltage in the circumferential direction 39 of the overlapping portion 31 can be improved, and a flashing in the circumferential direction 39 of the overlapping portion 31 can be prevented.
Furthermore, the inner surface 21 of the outer insulating sheet 33 of the overlapping portion 31 has a recess 23 formed so as to extend in the longitudinal direction of the insulating cylindrical body 30 and the outer surface 22 of the inner insulating sheet 32 of the overlapping portion 31 has an insulating cylindrical body. Since the temporary fastening structure 35 that can be fitted with the convex portion 24 formed so as to extend in the longitudinal direction of 30 is formed, the convex portion 24 is formed into the concave portion 23 until the insulating adhesive applied to the overlapping portion 31 is cured. It can be fitted and temporarily attached.
Further, the water in the insulating cylindrical body 30 can flow out from the drain pipe 40 through the drainage gap 38 formed between the jumper wire 1 and the inner peripheral surface 36 of the insulating cylindrical body 30.
Further, since the insulated wire cover device 10 of the present invention can be formed by extrusion molding, it can be manufactured at a low cost, and the mounting work to the jumper wire 1 can be performed efficiently, thereby reducing the insulation cost of the jumper wire. be able to.

In addition, in the said embodiment, although the insulated wire cover apparatus 10 was attached to the jumper wire 1, it is not limited to this, You may attach the insulated wire cover apparatus 10 to power transmission lines other than the jumper wire 1. FIG.
Moreover, in the said embodiment, although the recessed part 23 and the convex part 24 which were formed so that it might extend in the longitudinal direction of the insulation cylindrical body 30 were made into the structure which can be engage | inserted, the temporary fixing function of the duplication part 31 was comprised. The temporary fixing function is not limited to this, and may be a configuration that can be temporarily fixed until the insulating adhesive applied to the overlapping portion 31 is cured, for example, using a self-bonding tape.

It is sectional drawing of the cylindrical insulator used for the insulated wire cover apparatus of embodiment of this invention. It is sectional drawing of the insulated wire cover apparatus of embodiment of this invention. FIG. 3 is a cross-sectional view showing the AA cross section of FIG. FIG. 4 is a cross-sectional view showing a B-B cross section of the drain pipe of FIG. It is explanatory drawing which shows the conventional 1st example. It is explanatory drawing which shows the 2nd example of the past.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Jumper wire 10 Insulated wire cover apparatus 20 Cylindrical insulator 21 Inner surface 22 Outer surface 23 Recessed portion 24 Convex portion 25 Protrusion 30 Insulating cylindrical body 31 Overlap portion 32 Inner insulating sheet 33 Outer insulating sheet 34 Adhesive place 35 Temporary fastening structure 36 Inner circumference Surface 37 Hole 38 Clearance 40 Drain pipe

Claims (3)

  Forming an insulating cylindrical body so as to overlap an insulating sheet having elasticity around a power transmission line such as a jumper line in the circumferential direction, and having a temporary fixing function in the overlapping portion, and insulating bonding to the overlapping portion An insulated wire cover device characterized by having an agent applied thereto. The insulated wire cover device according to claim 1,
The temporary fixing function forms a recess extending in the longitudinal direction of the insulating cylindrical body on the inner surface of the outer insulating sheet of the overlapping portion, and extends in the longitudinal direction of the insulating cylindrical body on the outer surface of the inner insulating sheet of the overlapping portion. An insulated wire cover device characterized in that a protruding portion is formed and can be fitted between the recessed portion and the protruding portion. An insulated wire cover device according to claim 1 or 2,
A protrusion extending in the longitudinal direction of the insulating cylindrical body is provided at a lower portion of the inner peripheral surface of the insulating cylindrical body, and a gap for drainage is formed between the power transmission line and the insulating cylindrical body. An insulated wire cover device, wherein a hole is provided in a lower portion of an inner peripheral surface of a body, and a drain pipe for drainage is connected to the hole.

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