Coupling tool and coupling method

Abstract

To suppress vibration of an electric wire.SOLUTION: A coupling tool 1 comprises: a jumper wire 11 arranged in an electric wire 2, with which a discharge clamp 4 as a support tool is connected, over the discharge clamp 4; a first fixing tool 12 which fixes both ends 111_1, 111_2 of the jumper wire 11 to the electric wire 2 to electrically connect the jumper wire 11 with the electric wire 2; and second fixing tools 13, 13_1, 13_2 provided between the first fixing tool 12 and the discharge clamp 4 in an electric wire extension direction Xp to fix the jumper wire 11 to the electric wire 2 in a state of insulating the jumper wire 11 and the electric wire 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a connector for connecting to an electric wire supported by a power pole and a connection method, for example, a connector for connecting to an electric wire supported by a power pole by a support tool.

Background Art

[0002] Generally, on the line of high-voltage overhead electric wires of a high-voltage 6.6 kV system, support tools such as high-voltage suspension insulators and discharge clamps are provided, and the electric wire is supported by the power pole by the support tool. Here, a discharge clamp, which is an example of a support tool, is a device for preventing damage or fusing of an electric wire due to lightning strike or the like. The discharge clamp has an electric wire gripping portion that is electrically connected to the electric wire and grips the electric wire, an insulator, and a cover member that covers the electric wire gripping portion (see Patent Document 1). The discharge clamp is fixed to the electric pole via a brace. For example, the electric wire gripping portion directly grips a portion where the insulation coating of the electric wire is stripped off and the conductor is exposed (conductor exposed portion). The cover member covers the electric wire gripping portion that grips the electric wire. The electric wire gripping portion covered by the cover member is fixed to the brace via the insulator.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, an electric wire vibrates due to wind. Due to this vibration, bending stress concentrates on the portion fixed by the support of the electric wire. For example, the bending stress concentrates on the wire gripping portion of the discharge clamp and the exposed portion of the electric wire gripped by the wire gripping portion. If the stress concentration due to vibration continues over a long period of time, it may cause aging deterioration such as damage to the portion fixed by the support of the electric wire (in the case of a discharge clamp, the conductor exposed portion of the electric wire), and there is a risk that the electric wire may break. For example, when a high-voltage electric wire breaks, the broken high-voltage electric wire may fall and come into contact with a low-voltage electric wire or a building, etc., and there is a risk of a serious accident occurring.

[0005] The present invention has been made in view of the above-described problems, and an object thereof is to suppress the vibration of an electric wire.

Means for Solving the Problems

[0006] A connector according to a typical embodiment of the present invention includes a jumper wire disposed across the support on an electric wire supported by a power pole by the support, a first fixture that fixes both ends of the jumper wire to the electric wire respectively and electrically connects the jumper wire and the electric wire, and a second fixture that is provided between the first fixture and the support in the electric wire extending direction which is the direction in which the electric wire extends, and fixes the jumper wire to the electric wire in a state where the jumper wire and the electric wire are insulated from each other.

Effects of the Invention

[0007] According to the connector according to the present embodiment, it is possible to suppress the vibration of the electric wire.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 3C

Figure 3D

Figure 3E

Figure 3F

Figure 3G

Figure 4

Figure 5

DETAILED DESCRIPTION OF THE INVENTION

[0009] 1. Outline of the Embodiment First, an outline of a typical embodiment of the invention disclosed in the present application will be described. In the following description, as an example, reference numerals in the drawings corresponding to the components of the invention are described with parentheses.

[0010] 〔1〕A connector (1) according to a typical embodiment of the present invention includes a jumper wire (11) disposed across a support (4) on an electric wire (2) supported by a power pole by the support, a first fixture (12) that fixes both ends of the jumper wire to the electric wire respectively to electrically connect the jumper wire and the electric wire, and second fixtures (13, 13_1, 13_2) provided between the first fixture and the support in the electric wire extending direction (Xp) which is the direction in which the electric wire extends, for fixing the jumper wire to the electric wire in a state where the jumper wire and the electric wire are insulated from each other.

[0011] 〔2〕In the connector according to 〔1〕 above, each of the first fixing tools may be provided at least 1000 mm away from the support tool in the wire extending direction.

[0012] 〔3〕In the connector according to 〔1〕 or 〔2〕 above, the distance between the two second fixing tools (13_1, 13_1) arranged opposite to each other with the support tool sandwiched therebetween at the position closest to the support tool may be 450 mm.

[0013] 〔4〕In the connector according to 〔3〕 above, the length of the jumper wire between the two second fixing tools may be 50 mm longer than the distance between the two second fixing tools.

[0014] 〔5〕In the connector according to 〔1〕 above, the jumper wire has a core wire (112) formed from a conductor and an insulating coating (113) formed from an insulator and covering the core wire. The ends (111_1, 111_2) of the jumper wire in the jumper wire extending direction (Xj), which is the direction in which the jumper wire extends, include a first region (R1) covered by the insulating coating by a predetermined length from the tip of the jumper wire toward the center (P) of the jumper wire in the jumper wire extending direction, and a second region (R2) adjacent to the first region in the jumper wire extending direction and where the core wire is exposed. The first fixing tool may fix the jumper wire to the wire in a state where the second region of the jumper wire is in contact with the region where the conductor of the wire is exposed.

[0015] [(6)] The method according to a representative embodiment of the present invention includes a first step (S1) of preparing a jumper wire (11), a second step (S2) of attaching a mark (101) to the center (P) of the jumper wire in the jumper wire extending direction (Xj) which is the direction in which the jumper wire extends, a third step (S3) of attaching marks (102_1, 102_2) to two points (C1, C2) sandwiching the center of the jumper wire so that the length between the two points becomes a first value (500 mm), a fourth step (S4) of bending the jumper wire in a direction perpendicular to the jumper wire extending direction so that the distance (Lb1 + Lb2 = 450 mm) between the two marks attached in the third step is shorter than the first value (500 mm) to form a convex portion (110) on the jumper wire, a fifth step (S5) of removing the covering at both ends of the jumper wire, a sixth step (S6) of removing the covering of the electric wire (2) at two positions (A1, A2) separated from the support by a first distance (La1, La2) in the electric wire supported by the support (4) on the power pole, a seventh step (S7) of fixing the region (R2) where the covering of the end (111_1, 111_2) of the jumper wire with the convex portion formed thereon is removed to the region where the covering of the electric wire is removed in the sixth step by a first fixing tool (12), and an eighth step (S8) of fixing the jumper wire to the electric wire by a second fixing tool (13, 13_1, 13_1) at the two points where the marks were attached in the third step.

[0016] [(7)] In the connection method described in the above [(6)], the first distance may be at least 1000 mm.

[0017] [(8)] In the connection method described in the above [(6)] or [(7)], the first value is 500 mm, and the fourth step may include a step of forming the convex portion on the jumper wire so that the distance (Lb1 + Lb2) between the two marks attached in the third step becomes 450 mm.

[0018] 〔9〕In the connection method according to any one of the above〔6〕to〔8〕, the fifth step may include a step of removing a part of the coating of the jumper wire while leaving a predetermined length of the coating from the tip of the jumper wire.

[0019] 〔10〕In the connection method according to the above〔9〕, the predetermined length may be at least 30 mm.

[0020] 2. Specific Examples of Embodiments Hereinafter, specific examples of embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are given to the common components in each embodiment, and repeated descriptions are omitted. Also, note that the drawings are schematic, and it is necessary to be aware that the dimensional relationships and ratios of each element may be different from reality. There may also be parts where the dimensional relationships and ratios are different between the drawings.

[0021] ≪Embodiment≫ FIG. 1 is a diagram showing the configuration of a connector 1 according to an embodiment.

[0022] The connector 1 shown in FIG. 1 is for suppressing the vibration of an electric wire supported by a power pole by a support such as a discharge clamp or a high-voltage insulator. For example, the connector 1 suppresses the vibration around the discharge clamp in a high-voltage overhead electric wire of a high-voltage 6.6 kV system.

[0023] In FIG. 1, the electric wire 2 is, for example, a high-voltage overhead electric wire of a high-voltage 6.6 kV system. The electric wire 2 has a structure in which a core wire (not shown) formed of a conductor is covered with an insulating coating 20 formed of an insulator. The electric wire 2 is, for example, an aluminum electric wire (for example, an ACSR wire). The electric wire 2 is supported by a discharge clamp 4 as a support provided on a power pole (hereinafter, also simply referred to as a "pole") and a stay 3. For example, as shown in FIG. 1, a discharge clamp 4 is connected between the electric wire 2 and the stay 3.

[0024] The discharge clamp 4 is a device for preventing damage or fusing of the electric wire 2 due to lightning strikes or the like. The discharge clamp 4 has, for example, at least an electric wire gripping portion 42 that is electrically connected to the electric wire 2 and grips the electric wire 2, an insulator 41, and a cover member 43 that covers the electric wire gripping portion 42.

[0025] The electric wire gripping portion 42 is electrically connected to the electric wire 2 by gripping an exposed conductor portion where a part of the insulation coating of the electric wire 2 has been removed and the conductor is exposed. In FIG. 1, since the electric wire gripping portion 42 is covered by the cover member 43, the electric wire gripping portion 42 is not shown. The insulator 41 supports the electric wire gripping portion 42 on the stay 3 in a state of insulating the electric wire gripping portion 42 and the stay 3.

[0026] The connector 1 is connected to the electric wire 2 across the discharge clamp 4 in the electric wire extending direction Xp, which is the direction in which the electric wire 2 extends. Specifically, the connector 1 has a jumper wire 11, a fixture 12, and a fixture 13.

[0027] The jumper wire 11 has a core wire 112 formed of a conductor and an insulating coating 113 formed of an insulator and covering the core wire, as will be described later. The jumper wire 11 is, for example, an aluminum electric wire similar to the electric wire 2. It is preferable to use the same jumper wire 11 as the electric wire 2. As shown in FIG. 1, the jumper wire 11 is arranged, for example, across the discharge clamp 4 in the direction opposite to the vertical direction. Note that the jumper wire 11 may or may not be in contact with the discharge clamp 4 (cover member 43).

[0028] The fixture 12 is a component for fixing the jumper wire 11 to the electric wire 2. The fixture 12 fixes both ends of the jumper wire 11 to the electric wire 2 respectively, and electrically connects the jumper wire 11 and the electric wire 2.

[0029] The fixing tool 12 (first fixing tool) includes, for example, a compression sleeve formed of a metal material and a cover member formed of an insulator and covering the compression sleeve. With the regions where the insulation coatings at the ends of the jumper wire 11 are removed and the regions where the insulation coatings of the electric wire 2 are removed sandwiched by the compression sleeve, an external force is applied to the compression sleeve to compress it, so that the jumper wire 11 and the electric wire 2 are fixed in an electrically connected state. Then, a cover member is installed so as to cover the fixed compression sleeve. In the following description, the fixing tool 12 is also referred to as the "sleeve 12".

[0030] Each of the fixing parts 12 is preferably provided at least 1000 mm away from the discharge clamp in the electric wire extending direction Xp. For example, as shown in FIG. 1, when the portion where the electric wire gripping part 42 is connected to the electric wire 2 is taken as the center O of the discharge clamp 4, one sleeve 12 is provided at a position A1 that is separated from the center O of the discharge clamp 4 by a distance La1 (≧1000 mm) on the positive side in the electric wire extending direction Xp, and the other sleeve 12 is provided at a position A2 that is separated from the center O of the discharge clamp 4 by a distance La2 (≧1000 mm) on the negative side in the electric wire extending direction Xp. Details of the connection structure and connection method between the jumper wire 11 and the electric wire 2 by the sleeve 12 will be described later.

[0031] The fixing tool 13 (second fixing tool) is a component for fixing the jumper wire 11 to the electric wire 2. The fixing tools 13 are respectively provided between the sleeve 12 and the discharge clamp 4 in the electric wire extending direction Xp, and fix the jumper wire 11 to the electric wire 2 in a state where the jumper wire 11 and the electric wire 2 are insulated.

[0032] The fixing tool 13 is, for example, a binding wire formed by covering a linear conductor with an insulation coating. Between the fixing tool 12 and the discharge clamp 4, the fixing tool 13 is wound so as to tighten a portion with the insulation coating of the jumper wire 11 and a portion with the insulation coating of the electric wire 2, so that the jumper wire 11 is fixed in a state of being electrically insulated from the electric wire 2. In the following description, the fixing tool 13 is also referred to as the "binding wire 13".

[0033] The binding wire 13 is preferably provided at a position as close as possible to the discharge clamp 4 within the range that can be wound by the live working method. For example, the distance Lb between two binding wires 13 arranged opposite to each other with the discharge clamp 4 interposed therebetween at the position closest to the discharge clamp 4 is 450 mm (for example, within ±10%). In other words, one binding wire 13 is provided at a position B1 that is separated from the center O of the discharge clamp 4 by a distance Lb1 (= 225 mm) on the positive side in the wire extending direction Xp, and the other binding wire 13 is provided at a position B2 that is separated from the center O of the discharge clamp 4 by a distance Lb2 (= 225 mm) on the negative side in the wire extending direction Xp. Here, the length of the jumper wire 11 between the two binding wires 13 is 50 mm longer than the distance Lb (= 450 mm) between the two binding wires 13.

[0034] In addition, in FIG. 1, the case where one binding wire 13 is provided between the sleeve 12 and the discharge clamp 4 is illustrated, but the number of binding wires 13 provided between the sleeve 12 and the discharge clamp 4 is not particularly limited. That is, the jumper wire 11 may be fixed to the electric wire 2 by the binding wire 13 at a plurality of locations between the sleeve 12 and the discharge clamp 4. Also in this case, the distance between the binding wire 13 fixed at the position closest to the discharge clamp 4 and the binding wire 13 fixed at the position closest to the discharge clamp 4 on the opposite side with the discharge clamp 4 interposed therebetween is preferably 450 mm.

[0035] Next, a method for attaching the connector 1 according to the embodiment to the electric wire 2 will be described.

[0036] FIG. 2 is a flowchart showing an example of the flow of a method for attaching the connector 1 according to the embodiment to the electric wire 2. FIGS. 3A to 3F are diagrams for explaining a method for attaching the connector 1 according to the embodiment to the electric wire 2.

[0037] First, prepare jumper wire 11 (step S1). As shown in FIG. 3A, it is preferable that the length of the prepared jumper wire 11 is at least 2760 mm. This is to ensure that the distances La1 and La2 (≧1000 mm) from the center O of the discharge clamp 4 to the sleeve 12, as described above, are secured.

[0038] Next, when the direction in which the jumper wire 11 prepared in step S1 extends is defined as the jumper wire extension direction Xj, mark 101 is attached to the center P of the jumper wire 11 in the jumper wire extension direction Xj (step S2). For example, as shown in FIG. 3B, mark 101 is attached by attaching an insulating tape (e.g., adhesive polyethylene tape) to the center P of the jumper wire 11.

[0039] Next, marks 102_1 and 102_2 are respectively attached to the two points (positions C1 and C2) such that the length between the two points (positions C1 and C2) sandwiching the center P of the jumper wire 11 becomes the first value Lc (step S3). Specifically, as shown in FIG. 3C, mark 102_1 is attached to position C1 which is at a distance Lc1 from the center P11 of the jumper wire 11 in the jumper wire extension direction Xj, and mark 102_2 is attached to position C2 which is at a distance Lc2 from the center P of the jumper wire 11.

[0040] Here, the distances Lc1 = Lc2 = 250 mm (Lc = 500 mm). For example, similar to step S2, marks 102_1 and 102_2 are attached by attaching insulating tapes (e.g., adhesive polyethylene tapes) to the positions on the jumper wire 11 corresponding to positions C1 and C2, respectively.

[0041] Next, as shown in FIG. 3D, a convex portion 110 is formed on the jumper wire 11 (step S4). Specifically, the jumper wire 11 is bent in a direction perpendicular to the jumper wire extending direction so that the distance between 102_1 and 102_2 between the two marks made in step S3 becomes shorter than the first value Lc, thereby forming the convex portion 110 on the jumper wire 11. That is, the vicinity of the center P of the jumper wire 11 is deformed to form the convex portion 110 so that the distance between the two marks 102_1 and 102_2 becomes 450 mm.

[0042] Next, the insulation coating of the jumper wire 11 is removed (step S5). Specifically, the coatings at both ends 111_1 and 111_2 of the jumper wire 11 are removed. For example, a part of the coating of the jumper wire 11 is removed leaving a predetermined length of the coating from the tip of the jumper wire 11 to expose the core wire 112 from the jumper wire 11. Specifically, as shown in FIG. 3E, at one end 111_1 of the jumper wire 11, a part of the insulation coating of the jumper wire 11 is removed while leaving the insulation coating of a predetermined length Lt1 from the tip of the jumper wire 11. Similarly, at the other end 111_1 of the jumper wire 11, a part of the insulation coating of the jumper wire 11 is removed while leaving the insulation coating of at least a predetermined length Lt1 from the tip of the jumper wire 11.

[0043] Accordingly, as shown in FIG. 3E, the ends 111_1 and 111_2 of the jumper wire 11 each include a first region R1 covered by the insulation coating 113 by a predetermined length Lt1 from the tip of the jumper wire 11 toward the center P of the jumper wire 11 in the jumper wire extending direction Xj, and a second region R2 adjacent to the first region R1 in the jumper wire extending direction Xj where the core wire 112 is exposed. Here, the predetermined length Lt1 (Lt2) is 30 mm or more. Note that depending on the size (diameter) of the wire 2 to be attached, it may not be necessary to leave the insulation coating at the tip of the jumper wire 11. For example, when the size of the wire 2 to be attached is 240 mm 2 , Lt1 = Lt2 = 0 mm may be used.

[0044] Next, remove the insulating coating of a part of the electric wire 2 to be attached (step S6). Specifically, remove the coating at two positions A1 and A2 on the electric wire 2 that are separated from the center O of the discharge clamp 4 connected to the electric wire 2 by distances La1 and La2 (see, for example, FIG. 1). For example, if the length of the cut jumper wire 11 is 2760 mm and the size of the electric wire 2 is 120 mm 2 in this case, the distances La1 and La2 may be 1235 mm each. Note that the magnitudes of the distances La1 and La2 are not limited to the above example. Here, step S6 and steps S7 and S8 described later are performed, for example, by an indirect live wire method.

[0045] Next, as shown in FIG. 3E, fix the jumper wire 11 to the electric wire 2 with the sleeve 12 (step S7). Specifically, first, temporarily grip the jumper wire 11 and the electric wire 2 with a wire gripping tool. At this time, in the electric wire extending direction Xp, temporarily grip the jumper wire 11 and the electric wire 2 so that the center P of the jumper wire 11 marked with the mark 101 in step S2 coincides with the center O of the discharge clamp 4. Next, with the insulating coating 113 of one end 111_1 of the jumper wire 11 removed in the second region R2 and the region (position A1) where the insulating coating was removed from the electric wire 2 in step S6 sandwiched by a compression sleeve, apply an external force to the compression sleeve to compress it. Next, attach a cover member to the compression sleeve. Thereby, the sleeve 12 fixes one end 111_1 of the jumper wire 11 to the electric wire 2 in a state where the second region R2 of the jumper wire 11 is in contact with the region where the conductor of the electric wire 2 is exposed.

[0046] Next, the jumper wire 11 is fixed to the electric wire 2 by the binding wire 13 (step S8). Specifically, at the position of the jumper wire 11 marked with marks 102_1 and 102_2 in step S3, the jumper wire 11 is fixed to the electric wire 2 by the binding wire 13. For example, as shown in FIG. 3G, at the position where the mark 102_1 of the jumper wire 11 is attached, the binding wire 13 is wound around the jumper wire 11 and the electric wire 2 a plurality of times (for example, 5 times) to fix the jumper wire 11 to the electric wire 2 in a state where the jumper wire 11 and the electric wire 2 are insulated. Next, the gripping tool for the electric wire is removed. As a result, the end 111_1 side of the jumper wire 11 is further fixed to the electric wire 2 by the binding wire 13.

[0047] Then, for the other end 111_2 of the jumper wire 11, the steps of steps S6 to S8 described above are also performed, and the attachment of the connector 1 to the electric wire 2 is completed.

[0048] As described above, the connector 1 according to the embodiment includes a jumper wire 11 disposed across the discharge clamp 4 on the electric wire 2 to which the discharge clamp 4 is connected, sleeves 12 that fix both ends 111_1 and 111_2 of the jumper wire 11 to the electric wire 2 respectively and electrically connect the jumper wire 11 and the electric wire 2, and a binding wire 13 that fixes the jumper wire 11 to the electric wire 2 in a state where the jumper wire 11 and the electric wire 2 are insulated between the sleeve 12 in the electric wire extending direction Xp and the discharge clamp 4.

[0049] According to this, it is possible to suppress the breakage of the electric wire 2 to which the discharge clamp 4 is connected. This will be described in detail with reference to FIG. 4.

[0050] FIG. 4 is a diagram schematically showing how vibration is transmitted in the electric wire 2 to which the connector 1 according to the embodiment is connected.

[0051] As shown in Fig. 4, for example, consider the case where the electric wire 2 vibrates due to wind or the like. In this case, the vibration transmitted to the vicinity of the discharge clamp 4 branches and is transmitted to the jumper wire 11 of the coupler 1 and the electric wire 2 connected to the discharge clamp 4. That is, compared with the conventional case, the vibration of the electric wire 2 can be suppressed around the discharge clamp 4. Thereby, the bending stress due to the vibration applied to the electric wire 2 held by the wire gripping portion of the discharge clamp 4 can be reduced, so that the aging deterioration of the electric wire 2 can be suppressed, and the breakage of the electric wire is less likely to occur.

[0052] Further, according to the coupler 1 according to the embodiment, even if the electric wire 2 breaks at the connection portion of the discharge clamp 4 by any chance, since the electric wires 2 are connected by the coupler 1 with the discharge clamp 4 interposed therebetween, it is possible to prevent the electric wire 2 from falling. This will be described in detail with reference to Fig. 5.

[0053] Fig. 5 is a diagram schematically showing the states of the electric wire 2 before and after breakage, to which the coupler 1 according to the embodiment is connected.

[0054] In Fig. 5, the case where two binding wires 13_1 and 13_2 are provided between the discharge clamp 4 and the sleeve 12 is shown as an example.

[0055] As shown in Fig. 5, in the state G before the electric wire 2 breaks, if the electric wire 2 breaks at the position Z near the discharge clamp 4 of the electric wire 2 for some reason, the electric wire 2 on the negative side in the electric wire extending direction Xp as viewed from the discharge clamp 4 and the electric wire 2 on the positive side in the electric wire extending direction Xp as viewed from the discharge clamp 4 are in a state H connected by the coupler 1. Thereby, even when the electric wire breaks at the discharge clamp, the fall of the electric wire can be prevented.

[0056] Here, the closer the position where the jumper wire 11 is fixed to the electric wire 2 by the binding wire 13 is to the discharge clamp 4, the higher the anti-vibration effect of the electric wire can be. On the other hand, if the position where the binding wire 13 is fixed is too close to the discharge clamp 4, it becomes difficult to safely perform the work by the indirect live wire method. The inventor of the present application has found through experiments that if it is at least 225 mm away from the discharge clamp 4, the work by the indirect live wire method can be safely performed. Therefore, as shown in FIG. 5, by setting the distance between the two binding wires 13_1 arranged opposite to each other with the discharge clamp 4 sandwiched at the position closest to the discharge clamp 4 to 450 mm (225 mm × 2), it is possible to enhance the anti-vibration effect of the electric wire while safely performing the work by the indirect live wire method.

[0057] Also, as shown in FIG. 5, if the electric wire 2 breaks by any chance, the connected electric wire 2 after the break will loosen by the amount indicated by the reference numeral 115 in the convex portion 110 of the jumper wire 11. Here, in the state G before the electric wire 2 breaks, the length of the jumper wire 11 between the two binding wires 13_1 (500 mm) is designed to be 50 mm longer than the distance between the two binding wires 13_1 (450 mm). Therefore, the length of the electric wire 2 connected by the coupler 1 after the break is 50 mm longer than before the break, and the electric wire 2 will not loosen too much. Therefore, even if the electric wire 2 breaks by any chance, it is possible to surely prevent the electric wire 2 from loosening too much and contacting a low-voltage electric wire or the like.

[0058] Also, as described above, the sleeves 12 of the coupler 1 are each provided at least 1000 mm away from the discharge clamp 4 in the electric wire extending direction X. According to this, when lightning strikes, it is possible to prevent the wire 2 from breaking at the position where the sleeve 12 is fixed. That is, when an arc is discharged from the discharge clamp 4 during a lightning strike, a conductive gas is generated around the arc, increasing the conductivity around the discharge clamp 4. At this time, if there is a weak insulation part in the wire around the discharge clamp 4, the wire may break at that weak part. Here, the positions A1 and A2 of the wire where the above-mentioned sleeve 12 is fixed can be regarded as weak insulation parts because the insulation coating has been removed. The inventor of the present application has found through experiments that when the positions A1 and A2 where the insulation coating of the wire is removed are separated from the discharge clamp 4 by 1000 mm or more, it is possible to prevent the wire 2 from breaking during a lightning strike.

[0059] Therefore, as described above, by providing the sleeves 12 of the coupler 1 at positions at least 1000 mm away from the discharge clamp 4 in the wire extending direction Xp, it is possible to prevent the wire 2 from breaking at the position where the sleeve 12 is fixed during a lightning strike.

[0060] Also, as shown in FIG. 3E, the end portions 111_1 and 111_2 of the jumper wire 11 each include a first region R1 covered by the insulation coating 113 by a predetermined length Lt1 from the tip of the jumper wire 11 toward the center P of the jumper wire 11 in the jumper wire extending direction Xj, and a second region R2 adjacent to the first region R1 in the jumper wire extending direction Xj where the core wire 112 is exposed. The sleeve 12 fixes the jumper wire 11 to the wire 2 in a state where the second region R2 of the jumper wire 11 is in contact with the region where the conductor of the wire is exposed.

[0061] According to this, since the first region R1 covered by the insulation coating 113 exists at the tip portion of the jumper wire 11, it is possible to prevent the compression sleeve as the sleeve 12 from coming off after it is fixed. In particular, by setting the length of the first region R1 in the jumper wire extending direction Xj to at least 30 mm, it becomes easy to accommodate the first region R1 of the jumper wire 11 in the cover member while preventing the compression sleeve from coming off.

[0062] <<Expansion of Embodiment>> As described above, the invention made by the present inventor has been specifically described based on the embodiments. However, it goes without saying that the present invention is not limited thereto and can be variously modified without departing from the gist thereof.

[0063] For example, in the above embodiment, the case where the fixture for supporting the electric wire 2 on the utility pole is the discharge clamp 4 has been described. However, the fixture may be any one that supports the electric wire 2 on the utility pole. For example, it may be a high-voltage insulator.

[0064] The above flowchart shows an example for explaining the operation and is not limited thereto. That is, the steps shown in each figure of the flowchart are specific examples and are not limited to this flow. For example, the order of some processes may be changed, other processes may be inserted between each process, or some processes may be performed in parallel.

Explanation of Reference Numerals

[0065] 1... Coupling, 2... Electric wire, 3... Brace, 4... Fixture (discharge clamp), 11... Jumper wire, 12... Sleeve (first fixture), 13... Binding wire (second fixture), 101, 102_1, 102_2... Marks, 110... Convex portion, 111_1, 111_2... Ends of the jumper wire 11, 112... Core wire, 113... Insulating coating, R1... First region, R2... Second region, Xj... Jumper wire extending direction, Xp... Electric wire extending direction.

Claims

1. A jumper wire disposed across the support on an electric wire supported by a support, a first fixture that fixes both ends of the jumper wire to the electric wire respectively and electrically connects the jumper wire and the electric wire, and second fixtures respectively provided between the first fixture and the discharge clamp in the electric wire extending direction which is the direction in which the electric wire extends, and that fix the jumper wire to the electric wire while insulating the jumper wire and the electric wire. A connector.

2. The connector according to Claim 1, wherein the first fixtures are each provided at least 1000 mm away from the support in the electric wire extending direction. A connector.

3. The connector according to Claim 1, wherein the distance between two of the second fixtures disposed opposite to each other with the support therebetween at the position closest to the support is 450 mm. A connector.

4. The connector according to Claim 3, wherein the length of the jumper wire between the two second fixtures is 50 mm longer than the distance between the two second fixtures. A connector.

5. The connector according to Claim 1, wherein the jumper wire has a core wire formed of a conductor and an insulating coating formed of an insulator and covering the core wire, and an end portion of the jumper wire in the jumper wire extending direction which is the direction in which the jumper wire extends includes a first region covered by the insulating coating by a predetermined length from the tip of the jumper wire toward the center of the jumper wire in the jumper wire extending direction, and a second region adjacent to the first region in the jumper wire extending direction and where the core wire is exposed, and the first fixture fixes the jumper wire to the electric wire in a state where the second region of the jumper wire and a region where the conductor of the electric wire is exposed are in contact with each other. A connector.

6. A first step of preparing a jumper wire, a second step of marking the center of the jumper wire in the jumper wire extending direction which is the direction in which the jumper wire extends, a third step of respectively marking two points such that the length between the two points sandwiching the center of the jumper wire becomes a first value, and a fourth step of bending the jumper wire in a direction perpendicular to the jumper wire extending direction so that the distance between the two marks made in the third step becomes shorter than the first value to form a convex portion on the jumper wire. A fifth step of removing the coatings at both ends of the jumper wire; A sixth step of removing the coatings of the wire at two positions at least a first distance away from the support tool in the wire supported by the support tool on the utility pole; A seventh step of fixing, by a first fixture, the area where the coating has been removed at the end of the jumper wire where the convex-shaped portion is formed to the area where the coating of the wire has been removed in the sixth step; An eighth step of fixing the jumper wire to the wire by a second fixture at the two points marked in the third step, and the connection method includes: Connection method.

7. In the connection method according to claim 6, The first distance is at least 1000 mm Connection method.

8. In the connection method according to claim 6, The first value is 500 mm, and The fourth step includes a step of forming the convex-shaped portion on the jumper wire such that the distance between the two marks made in the third step becomes 450 mm Connection method.

9. In the connection method according to claim 6, The fifth step includes a step of removing a part of the coating of the jumper wire while leaving a predetermined length of the coating from the tip of the jumper wire Connection method.

10. In the connection method according to claim 9, The predetermined length is at least 30 mm Connection method.

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