JP2022029924A - Cable measurement supporting tool - Google Patents

Abstract

To provide a cable measurement supporting tool with which a cable measurement job can be safely and efficiently implemented using an indirect live-wire method.SOLUTION: A cable measurement supporting tool 100 is configured with respect to a cable head 20 in which a cable 14 is connected above a rubber flexible tube 16 and a rubber cover 18 with the lower side opened is mounted in a location of the connection. The cable measurement supporting tool 100 comprises: a joint 110 connected to a tip end of an indirect live-wire rod 200; a conductive spatula 120 inserted into a gap between an opening 18a of the rubber cover 18 and the rubber flexible tube 16; and a ground wire 130 connected to the spatula 120.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cable measurement assisting tool for a cable head to which a cable is connected above a rubber tube or a rubber tube and a rubber cover with an open bottom is attached to the connection point.

Cable measurement work is one of the maintenance management of power lines. In the cable measurement work, the continuity color of the equipment and the insulation resistance are measured for the newly installed or repaired cable to check the soundness of the cable. At present, after wearing high-voltage hot-line protective equipment, a sense meter (a measuring instrument for colorizing continuity) is attached to the cable head. Then, by measuring the resistance from one end, the continuity / phase discrimination (coloring) of the cable is confirmed by the difference in the resistance value.

However, if the above-mentioned work is directly performed by the live-line method, the burden on the worker is heavy and the work efficiency is lowered. Therefore, it is desired that the cable measurement work be performed by the indirect hot-line method. When working by the indirect hot-line method, it is considered to use a tool attached to the tip of an indirect hot-line rod (also referred to as an insulating operation rod or a hot stick) as in Patent Document 1, for example. Patent Document 1 discloses a wire stripping tool that is a tip tool for an indirect hot-line rod and strips and removes an insulating coating of a wire.

Japanese Unexamined Patent Publication No. 2019-21274

In the cable head, an electric wire is connected above the rubber tube or the porcelain tube, and the connection portion is covered with a rubber cover. Therefore, when connecting to the conductor in the cable head, the rubber cover is removed instead of stripping the coating as in Patent Document 1. As a typical work, the fixing tape at the upper end of the rubber cover is cut, and the rubber cover is moved upward (toward the electric wire side) to expose the connection portion. However, since it is a direct hot-line method, the work is done with thick insulating gloves, and the work efficiency is poor. In addition, it is necessary to return the displaced rubber cover to the correct position and rewind the fixing tape, which is laborious.

Alternatively, since the hem (lower end) of the rubber cover is an open cylinder, it can be turned up from the hem to expose the connection portion. However, the point that it is difficult to work with the insulating gloves for direct live line is the same as the case of shifting the rubber cover. Also, since the rubber cover is hard, it requires a considerable amount of force to turn it over, which is not an easy task. Therefore, it has been required to develop a tool more suitable for cable measurement work.

In view of such problems, it is an object of the present invention to provide a cable measurement auxiliary tool capable of safely and efficiently performing cable measurement work by using an indirect hot-line method.

In order to solve the above problems, in a typical configuration of the cable measurement auxiliary tool according to the present invention, a cable is connected above a rubber tube or a porcelain tube, and a rubber cover with an open bottom is attached to the connection point. It is a cable measurement auxiliary tool for the cable head, and is connected to the joint connected to the tip of the indirect live wire rod, the conductive spatula to be inserted into the gap between the opening of the rubber cover and the rubber tube or the porcelain tube, and the spatula. It is characterized by having a ground wire.

In the above configuration, a conductive spatula is attached to the indirect hot-line rod used in the indirect hot-line method. Then, by inserting the spatula into the gap between the opening of the rubber cover and the rubber tube or the porcelain tube, the spatula is brought into contact with the connecting portion which is a conductor to conduct conduction, and the conduction color of the equipment and the insulation resistance measurement are measured. Therefore, the cable measurement work can be performed using the indirect hot-line method, the safety of the worker can be ensured, and the work efficiency can be improved.

The spatula may have a crank shape. According to such a configuration, when the spatula is inserted into the opening of the rubber cover, it is possible to avoid the interference between the rubber tube or the porcelain tube and the spatula.

The tip of the spatula is preferably concave. As a result, the tip of the spatula can be suitably abutted against the connection portion of the cable head.

According to the present invention, it is possible to provide a cable measurement auxiliary tool capable of safely and efficiently performing a cable measurement operation by using an indirect hot-line method.

It is a figure explaining the cable measurement auxiliary tool which concerns on this embodiment. It is a usage figure of an auxiliary tool. It is an enlarged view of the vicinity of the rubber tube or the porcelain tube of FIG. It is an enlarged perspective view of FIG. 3A.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and the drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate explanations, and elements not directly related to the present invention are not shown. do.

FIG. 1 is a diagram illustrating a cable measurement auxiliary tool (hereinafter, referred to as an auxiliary tool 100) according to the present embodiment. As shown in FIG. 1, the auxiliary tool 100 of the present embodiment is an attachment attached to the tip of an indirect hot-line rod 200. In particular, the auxiliary tool 100 is configured to include a joint 110, a spatula 120 and a ground wire 130.

The joint 110 is a mounting portion to the tip of the indirect hot-line rod 200 (insulation operation rod). The spatula 120 has conductivity, and one end thereof is fixed to the joint 110. The "spatula" means an elongated plate material. The spatula 120 has a metal exposed in the vicinity of the tip 122, and a rubber coating 124 is applied to the other parts. A ground wire 130 is electrically connected to the spatula 120. A clamp 140 is attached to the end of the ground wire 130.

FIG. 2 is a usage diagram of the auxiliary tool 100. As shown in FIG. 2, an electric wire 12 is suspended on the utility pole 10. The cable 14, which is a lead-in wire from the electric wire 12, is connected above the rubber tube 16 of the cable head 20 (some are made of a rubber tube instead of the rubber tube). A rubber cover 18 with an open bottom is attached to the connection portion between the cable 14 and the rubber tube 16. The clamp 140 is connected to the ground fitting 22 of the utility pole 10, whereby the spatula 120 is grounded.

FIG. 3 is an enlarged view of the vicinity of the rubber tube 16 of FIG. Of the three rubber tube 16, the rubber cover 18 of the rubber tube 16 on the right side is transparently displayed for easy understanding.

When measuring the cable, first, the auxiliary tool 100 is attached to the tip of the indirect hot-line rod 200. Then, as shown in FIG. 3A, the spatula 120 of the auxiliary tool 100 is inserted into the gap between the opening 18a of the rubber cover 18 and the rubber tube 16. At this time, since the tip 122 is covered with the rubber coating 124, it is possible to prevent the opening 18a of the rubber cover from being damaged.

Inside the rubber cover 18, the tip 16a of the rubber tube and the cable end 14a are connected by a metal fitting 24. Since this connection portion is a conductor, it conducts by pressing the tip of the spatula 120, and the cable 14 is grounded via the ground wire 130.

Subsequently, of the three-phase cables 32 housed in the high-voltage cabinet 30, the tester 40 is connected to the cable 14 in which the spatula 120 is inserted and the corresponding cable 32 (see FIG. 2). Then, by measuring the ground resistance of the cable 32, is the cable between the cable head 20 and the high-voltage cabinet 30 correctly connected in the same phase (color identification), and is there a resistance that can be charged (color identification)? Soundness) can be confirmed.

As described above, according to the auxiliary tool 100 of the present embodiment, the cable measurement can be performed without shifting or turning the rubber cover by the indirect hot-line method. Therefore, it is possible to ensure the safety of workers and improve work efficiency.

Further, as shown in FIG. 3A, the spatula 120 has a crank shape. The crank shape is a shape that bends twice and extends to the original angle, and the base of the spatula and the tip 122 of the spatula are displaced positions (shifted positions) via the crank portion 120a. This makes it possible to avoid interference between the rubber tube 16 and the spatula 120 when the spatula 120 is inserted into the gap between the opening 18a of the rubber cover 18 and the rubber tube 16. In addition, as shown in FIG. 3B, if the direction of the crank with respect to the rubber tube 16 is reversed, the spatula 120 can be deeply inserted into the rubber cover 18 while avoiding the lower end of the rubber cover 18.

FIG. 4 is an enlarged perspective view of FIG. 3 (a). As shown in FIG. 4, in the auxiliary tool 100 of the present embodiment, the tip 122 of the spatula 120 has a concave shape. If the tip of the spatula is flat, it is possible that the tip of the spatula slips when the spatula is abutted against a cable having a circular cross-sectional shape.

On the other hand, if the tip 122 of the spatula 120 has a concave shape as in the present embodiment, the cable 14 is fitted into the tip 122 of the spatula 120. This makes it possible to ensure continuity to the spatula 120 while preventing slippage when the spatula 120 is strongly pressed against the cable 14.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, which naturally belong to the technical scope of the present invention. Understood.

INDUSTRIAL APPLICABILITY The present invention can be used as a cable measurement auxiliary tool for a cable head in which a cable is connected above a rubber tube or a rubber tube and a rubber cover with an open bottom is attached to the connection point.

10 ... Electric pole, 12 ... Electric wire, 14 ... Cable, 14a ... Cable end, 16 ... Rubber tube, 16a ... Rubber tube tip, 18 ... Rubber cover, 18a ... Opening, 20 ... Cable head, 22 ... Ground fitting , 24 ... metal fittings, 30 ... high pressure cabinet, 32 ... cable, 40 ... tester, 100 ... auxiliary tool, 110 ... joint, 120 ... spatula, 120a ... crank part, 122 ... spatula tip, 130 ... ground wire, 140 ... clamp , 200 ... Indirect live wire bar

Claims (3)

A cable measurement auxiliary tool for a cable head in which a cable is connected above a rubber tube or a rubber tube and a rubber cover with an open bottom is attached to the connection point.
A joint that connects to the tip of an indirect hot-line rod,
A conductive spatula to be inserted into the gap between the opening of the rubber cover and the rubber tube or the porcelain tube,
The ground wire connected to the spatula and
A cable measurement auxiliary tool characterized by having. The cable measurement assisting tool according to claim 1, wherein the spatula has a crank shape. The measurement assisting tool according to claim 1 or 2, wherein the tip of the spatula has a concave shape.

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