CN112864966A

CN112864966A - Live repair method of cable head sheath grounding lead

Info

Publication number: CN112864966A
Application number: CN202110111939.5A
Authority: CN
Inventors: 冯振波; 吴晓杰; 郑孝干; 董剑峰; 张良发; 林信恩; 卓晗; 潘彬; 刘行洲; 赵新丰; 马明
Original assignee: Fuzhou Yili Power Engineering Co ltd; State Grid Fujian Electric Power Co Ltd; Fuzhou Power Supply Co of State Grid Fujian Electric Power Co Ltd
Current assignee: Fuzhou Yili Power Engineering Co ltd; State Grid Fujian Electric Power Co Ltd; Fuzhou Power Supply Co of State Grid Fujian Electric Power Co Ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-05-28
Anticipated expiration: 2041-01-27
Also published as: CN112864966B

Abstract

The invention relates to a live repair method for the grounding lead of the cable head sheath, comprising the following steps: (1) installation of the plug-in grounding wire: fixing the grounding end of the plug-in grounding wire on the grounding point; removing the working point with an insulating wrench (2) Removal and repair of the old ground lead: use insulating clamps to remove the damaged lead residue; ground the new ground lead (3) Dismantling of the plug-in grounding wire: After the repair work is completed, remove the connector end of the plug-in grounding wire from the working point and pass the insulation The wrench installs the retaining nut to the new ground lead at the work point; removes the ground end of the plug-in ground wire from the ground point and the job is over. The invention has reasonable design and convenient operation, effectively protects the personal safety of operators, improves the process flow, and improves the operation efficiency.

Description

Method for repairing grounding lead of cable head sheath in electrified manner

The technical field is as follows:

the invention relates to a method for repairing a grounding lead of a cable head sheath in an electrified way.

Background art:

the sheath grounding lead of the cable head of the power transmission line is often lost and damaged due to theft or external force damage. For this reason, the worker needs to perform live repair of the ground lead. When an operator works on detected equipment at present, a grounding lead connecting end is close to an electrified body above, the working space is narrow, high induced electricity exists, and the currently used tool cannot safely remove the grounding lead end. Meanwhile, after the grounding lead of the cable head protective layer is lost, large dangerous leakage current exists, an operator cannot directly contact the grounding lead, the grounding lead is often required to be processed on site, the simple lead is used, and the dangerous hidden danger is large. Lead bases of field devices are different due to different manufacturers, the difficulty in field processing of tools and appliances is high, and operation procedures and time consumption are increased.

The invention content is as follows:

the invention aims to solve the problems in the prior art, namely, the invention provides a method for repairing the grounding lead of the cable head protective layer in an electrified way, which has reasonable structural design and convenient operation.

In order to achieve the purpose, the invention adopts the technical scheme that: a cable head sheath grounding lead electrified repairing method comprises the following steps:

step S1, plug and ground wire mounting:

step S11: fixing the grounding end of the plug-and-ground wire on the grounding point;

step S12: removing the fixing nut of the old grounding lead on the operation point by using an insulating wrench, and then connecting the connector end of the plug-and-ground wire to the operation point;

step S2, removing and repairing the old ground lead:

step S21: removing damaged lead residues using an insulating clamp;

step S22: installing the grounding end of the new grounding lead at the grounding point;

step S23: installing a new grounding lead live end connector at an operation point;

step S3, namely, dismantling the plug-and-ground wire:

step S31: after the repairing operation is finished, the connector end of the plug-and-ground wire is removed from the operation point, and the fixing nut is installed on a new ground lead on the operation point through an insulating spanner;

step S32: and removing the grounding end of the plug-in grounding wire from the grounding point, and finishing the operation.

Furthermore, plug and earth connection includes the cable body, the one end of cable body is provided with ground connection fixed establishment, and the other end of cable body is provided with connects the electric clamping head.

Further, connect the electric clamping head and include that one end cup joints fixed first connection nose with the cable body, the other end of first connection nose is equipped with and is equipped with the holding recess, be equipped with two grip blocks that set up about in opposite directions in the holding recess, grip block one end is stretched out holding recess, the other end and is articulated mutually with the lateral wall of holding recess, and the one end medial part that the grip block stretched out the holding recess is equipped with the centre gripping notch, is connected with between two grip blocks to be used for stimulateeing two grip blocks pivoted clamp spring in opposite directions.

Furthermore, a plurality of engaging teeth are arranged on the inner side of one end of the clamping plate, which is positioned in the accommodating groove, and the engaging teeth of the two clamping plates are engaged with each other.

Furthermore, the grounding fixing mechanism comprises a U-shaped fixing seat, a fixing clamping plate is arranged between the top and the bottom of the U-shaped fixing seat in parallel, the fixing clamping plate is connected with the side part of the U-shaped fixing seat in a sliding manner, a screw rod penetrates through the top thread of the U-shaped fixing seat, and the screw rod is fixedly connected with the top of the fixing clamping plate so as to drive the fixing clamping plate to slide along the side part of the U-shaped fixing seat; the wire connecting device further comprises a second wire connecting nose, one end of the second wire connecting nose is fixedly sleeved with the cable body, and the other end of the second wire connecting nose is locked and fixed with the side part of the U-shaped fixing seat through a fastening piece.

Furthermore, the insulation wrench comprises an insulation handle and a wrench head arranged at one end of the insulation handle; the insulating clamp comprises a fixed arm, a clamp body is arranged at the upper end of the fixed arm, and a driving mechanism used for driving the clamp body to move is arranged at the lower end of the fixed arm.

Furthermore, one end face of the fixed arm close to the clamp body is fixedly connected with a U-shaped hinge seat; the clamp body comprises two movable arms which are arranged in a crossed mode in the middle, the middle portions of the two movable arms are located inside the U-shaped hinged seat and hinged to the U-shaped hinged seat through a first hinged shaft, the upper ends of the movable arms are provided with clamp heads, the lower ends of the movable arms are provided with grab handles, and the grab handles of the two movable arms are connected with the driving mechanism.

Further, the fixing arm is of a tubular structure with a hollow interior; the driving mechanism comprises an operating handle positioned on the lower side of the fixed arm, a pull rod arranged in the fixed arm in a sliding mode is fixedly connected to the upper end of the operating handle, the upper end of the pull rod is hinged to the lower ends of two connecting rods distributed left and right, and the upper ends of the two connecting rods are hinged to the lower ends of the handles of the two movable arms respectively.

Furthermore, the upper end of the pull rod is provided with a U-shaped hinge concave part, and the lower ends of the two connecting rods extend into the U-shaped hinge concave part and are hinged with the U-shaped hinge concave part through a second hinge shaft; the left side wall and the right side wall of the upper end of the fixed arm are respectively provided with an avoiding groove which is beneficial to the extension of the connecting rod, and the avoiding groove extends along the axial direction of the fixed arm; the operating handle is annular; the lower end of the fixed arm is fixedly connected with an annular fixed handle, and the fixed handle is sleeved on the outer side of the operating handle.

Furthermore, the insulating handle and the insulating clamp are made of phenolic epoxy resin glass reinforced plastics.

Compared with the prior art, the invention has the following effects: the invention has reasonable design, can effectively reduce the leakage current on the tool during operation, can disassemble and assemble the soft grounding wire on different cable lead connectors, effectively protects the personal safety of operators, improves the process flow and improves the operation efficiency.

Description of the drawings:

FIG. 1 is a schematic perspective view of a plug-and-ground wire according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a plug-and-ground wire with an electrical connector;

FIG. 3 is a schematic sectional view of the plug-and-ground wire with the electrical connector;

FIG. 4 is a schematic perspective view of a grounding fixing mechanism in the plug-and-ground wire;

FIG. 5 is a schematic perspective view of an insulation clamp according to an embodiment of the present invention;

FIG. 6 is a front cross-sectional view of an insulation clamp according to an embodiment of the present invention;

FIG. 7 is a schematic view showing the internal configuration of an insulation clamp in the embodiment of the present invention;

FIG. 8 is a schematic perspective view of the movable arm of the insulating clamp;

fig. 9 is a schematic perspective view of an insulation wrench according to an embodiment of the present invention.

The specific implementation mode is as follows:

the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

As shown in fig. 1 to 5, the method for repairing the grounding lead of the cable head sheath with electricity of the invention comprises the following steps:

step S1, plug and ground wire mounting:

step S2, removing and repairing the old ground lead:

step S21: removing damaged lead residues using an insulating clamp;

step S3, namely, dismantling the plug-and-ground wire:

As shown in fig. 1 to 4, the plug-and-ground wire includes a cable body 1, one end of the cable body 1 is provided with a ground fixing mechanism 2, and the other end of the cable body 1 is provided with an electric clamping head 3; when the grounding device is used, the grounding fixing mechanism 2 is used for being connected with a grounding point, and the electric connection clamping head 3 is used for being connected to an operation point. In the embodiment, the electric connection clamping head 3 comprises a first wiring lug 4, one end of the first wiring lug 4 is fixedly sleeved with the cable body 1, the other end of the first wiring lug 4 is provided with a U-shaped accommodating groove 5, two clamping plates 6 which are oppositely arranged from left to right are arranged in the accommodating groove 5, one end of each clamping plate 6 extends out of the accommodating groove 5, and the other end of each clamping plate is hinged with the side wall of the corresponding accommodating groove 5, so that the clamping plates 6 can rotate; the inner side part of one end of each clamping plate 6 extending out of the accommodating groove 5 is provided with a clamping notch 7, each clamping notch 7 is used for being matched with a joint of an operation point, and a clamping spring 8 used for pulling the two clamping plates 6 to rotate oppositely is connected between the two clamping plates 6. When the clamping device is used, the two clamping plates 6 arranged in opposite directions are clamped to clamp the joint of an operation point in a matching mode, and the clamping spring 8 utilizes elasticity to increase the clamping force of the two clamping plates 6, so that the connection strength is improved. The two clamping plates are connected through the spring, and the distance between the clamping notches of the two clamping plates is changed, so that the clamping device can adapt to joints (such as bolts) of different models, and effectively overcomes the difficulty that the operation process is complicated due to different manufacturers and different models of the grounding joint in the field equipment; meanwhile, the joint of the power connection clamping and the operation point is convenient to assemble and disassemble, and the safety and the convenience of operation are improved.

In this embodiment, the clamping spring is located inside the accommodating recess.

In this embodiment, in order to improve the clamping stability and the firmness of the electrical connection clamping head, the inner side portion of one end of the clamping plate 6 located in the accommodating groove 5 is provided with a plurality of engaging teeth 9, and the engaging teeth 9 of the two clamping plates 6 are engaged with each other. The teeth are meshed with each other, so that the matching stability between the two clamping plates is improved.

Preferably, the clamping recess 7 is V-shaped in order to increase the clamping effect. Preferably, the inner side of the holding plate may be in a zigzag shape.

In this embodiment, ground connection fixed establishment 2 includes U type fixing base 10, parallel between the top of U type fixing base 10 and the bottom is equipped with solid fixed splint 11, gu fixed splint 11 passes through the lateral part sliding connection of U type notch with U type fixing base 10, and screw rod 12 is worn to be equipped with by the top screw thread of U type fixing base 10, screw rod 12 and solid fixed splint 11's top fixed connection to drive solid fixed splint 11 slides along the lateral part of U type fixing base 10. When the clamping device is used, the fixing clamping plate 11 is matched with the bottom of the U-shaped fixing seat 10 to clamp, and the clamping force is ensured by self-locking of the threads of the screw 12. Taking the grounding fixing mechanism connected with the steel of the grounding point as an example, the U-shaped fixing seat is clamped from the side part of the steel, the steel is positioned between the fixing clamping plate and the bottom of the U-shaped fixing seat, then the screw rod is rotated to drive the fixing clamping plate to move towards the bottom of the U-shaped fixing seat, and the fixing clamping plate is matched with the bottom of the U-shaped fixing seat to clamp the steel, so that the grounding wire is fixedly connected with the grounding point.

In this embodiment, for convenience of operation, a rotation handle 13 for driving the screw to rotate is fixedly installed at one end of the screw 12 away from the fixing clamp plate.

In this embodiment, the ground fixing mechanism 2 further includes a second wire connecting lug 14, one end of which is fixedly sleeved with the cable body 1, and the other end of the second wire connecting lug 14 is locked and fixed with the side portion of the U-shaped fixing seat 10 through a fastening member. Preferably, for stable connection, a connecting plate 15 is fixedly connected to the outer end of the side portion of the U-shaped fixing seat 10, and a positioning concave portion 16 for accommodating the other end of the second wire connecting nose 14 is formed in one side surface of the connecting plate 15.

In this embodiment, it should be noted that, in actual use, the lengths of the plug-and-ground wires can be combined as required.

As shown in fig. 9, the insulated wrench 17 includes an insulated handle 19 and a wrench head 20 disposed at one end of the insulated handle, and the wrench head 20 may be a movable wrench head, a fixed wrench head or a socket wrench head in the prior art.

As shown in fig. 5 to 8, the insulating clamp 18 includes a fixed arm 21, a clamp body 22 is disposed at an upper end of the fixed arm 21, and a driving mechanism for driving the clamp body 22 to perform a clamping operation is disposed at a lower end of the fixed arm 21. When the insulation clamp is used, the insulation wrench is used for removing the fixing nut at the power connection end, and the insulation clamp is used for removing the residual damaged lead; because the clamp body is connected to the upper end of the fixing arm, the clamp body is conveniently driven at the far end during use, and operation in a narrow space is facilitated.

In this embodiment, a U-shaped hinge seat 23 is fixedly connected to an end surface (upper end surface) of the fixing arm 21 close to the clamp body 22; the clamp body 22 comprises two movable arms 24 which are arranged in the middle in a crossed manner, the middle parts of the two movable arms 24 are located inside the U-shaped hinged seat 23 and hinged with the U-shaped hinged seat 23 through a first hinged shaft, the upper ends of the movable arms 24 are provided with clamp heads 25, the lower ends of the movable arms are provided with grab handles 26, the grab handles 26 of the two movable arms 24 are connected with a driving mechanism, and the driving mechanism drives the clamp heads to rotate in opposite directions or in the opposite directions through the grab handles of the two movable arms so as to realize clamping action. It should be noted that the structure of the clamp body may be similar to that of a vise in the prior art, that is, the structure of the head of the movable arm is similar to that of the vise in the prior art, and the structure thereof is not repeated here.

In this embodiment, the fixing arm 21 is a tubular structure with a hollow interior; the driving mechanism comprises an operating handle 27 positioned on the lower side of the fixed arm 21, a pull rod 28 arranged in the fixed arm 21 in a sliding manner is fixedly connected to the upper end of the operating handle 27, the upper end of the pull rod 28 is hinged to the lower ends of two connecting rods 29 distributed left and right, and the upper ends of the two connecting rods 29 are respectively hinged to the lower ends of the handles 26 of the two movable arms 24. When the pull rod 28 is pulled downward by operating the handle 27, the pull rod 28 drives the two connecting rods 29 to rotate toward each other (inward), and the two connecting rods 29 rotate while driving the two jaws 25 of the two movable arms 24 to rotate toward each other (inward), so as to realize the clamping action. When the pull rod 28 is pushed upwards, the two connecting rods 29 rotate back to back (outward), and the two connecting rods 29 rotate and drive the clamp heads 25 of the two movable arms 24 to rotate back to back (outward), so that the loosening action is realized, and the clamping is released. Because the operating handle and the clamp body are the upper end and the lower end of the fixing arm, the remote operating clamp action can be realized.

In this embodiment, the upper end of the pull rod 28 is provided with a U-shaped hinge recess 30, and the lower ends of the two connecting rods 29 extend into the U-shaped hinge recess 30 and are hinged with the U-shaped hinge recess through a second hinge shaft.

In this embodiment, lateral wall is equipped with respectively about fixed arm 24's upper end so as to be favorable to the connecting rod to stretch out dodge groove 31, dodge groove 31 and extend along fixed arm 21's axis direction for dodge the rotation of connecting rod, can play certain guide effect to the motion of connecting rod simultaneously.

In this embodiment, the operation handle 27 is annular for convenience of operation; the lower end of the fixed arm 21 is fixedly connected with an annular fixed handle 32, the fixed handle 32 is sleeved outside the operation handle 27, and when the fixing device is used, the palm is supported at the lower end of the fixed handle and penetrates through an inner hole of the operation handle to pull the operation handle downwards.

In this embodiment, in order to improve the clamping effect, the inner side end of the binding clip 25 is provided with an anti-slip line 33.

In this embodiment, the middle of the movable arm 24 is provided with a circular overlapping recess 34, the middle of the two movable arms 24 are overlapped together through the overlapping recess 31, and the first hinge shaft penetrates through the middle of the overlapping recess.

In the embodiment, the insulating handle and the insulating clamp are made of phenolic epoxy resin glass reinforced plastics; adopt phenol formaldehyde epoxy glass steel as the preparation material, under the circumstances of guaranteeing strong insulating ability, let insulating handle and fixed arm short enough, the convenience is operated in narrow and small space.

In this embodiment, the insulating wrench and the insulating clamp can satisfy the withstand voltage test of 220kV, i.e., the resistance of the plug-and-ground wire is smaller than the resistance of the 16mm personal security wire.

Because the cable head of the power transmission line is exposed to the field environment for a long time to operate and is made of nonferrous metals, the conditions of abrasion, theft, loss and the like can be frequently generated, and the down conductor needs to be repaired in time for avoiding operation accidents. The invention can immediately eliminate the defect of the grounding lead in an electrified way when the grounding lead has a damage defect, thereby ensuring the safe and reliable operation of the line, improving the power supply reliability of the line, reducing the loss of power failure, simultaneously avoiding the injury of operators caused by leakage current and ensuring the personal safety. The method can avoid the problem that power failure treatment is needed due to the fact that the cable head protective layer grounding lead cannot be installed due to insufficient safety distance after the cable head protective layer grounding lead is lost, the power failure time can be reduced by about 8 hours in each operation, and by taking 10 times of 220kV cable head down lead damage treatment operation every year as an example, the power supply amount can reach 1200 ten thousand kilowatts per hour each year, and the economic and social benefits are remarkable.

The invention has the advantages that: (1) the plug-and-ground wire has simple and reasonable structural design, and the electric connection clamping head can adapt to joints of different models, thereby effectively overcoming the difficulty that the operation process is complicated because the grounding joints in the field equipment are different in manufacturers and models; (2) the insulating spanner and the insulating clamp are convenient to operate in a narrow space, and meanwhile, operators can be prevented from being damaged by leakage current, so that personal safety is guaranteed; (3) leakage current on the tool can be effectively reduced during operation, the soft grounding wire can be disassembled and assembled on different cable lead connectors, personal safety of operators is effectively protected, the process flow is improved, and the operation efficiency is improved.

If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.

Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims

1. a cable head sheath grounding lead live repair method, is characterized in that: comprise the steps:

Step S1, installation of plug-in grounding wire:

Step S11: fix the grounding end of the plug-in grounding wire at the grounding point;

Step S12: Use an insulating wrench to remove the fixing nut of the old grounding lead on the operating point, and then connect the connector end of the plug-in grounding wire to the operating point;

Step S2, removal and repair of the old ground lead:

Step S21: use insulating clamps to remove the damaged lead residue;

Step S22: install the grounding end of the new grounding lead at the grounding point;

Step S23: install the live end connector of the new ground lead at the operating point;

Step S3, the removal of the plug-in ground wire:

Step S31: after the repairing operation is completed, remove the connector end of the plug-in grounding wire from the working point, and install the fixing nut to the new grounding lead on the working point through an insulating wrench;

Step S32: Remove the grounding end of the plug-in grounding wire from the grounding point, and the operation ends.

2 . The live repair method for the grounding lead of the cable head sheath according to claim 1 , wherein the plug-in grounding wire comprises a cable body, one end of the cable body is provided with a grounding fixing mechanism, and the cable body is energized. 3 . The other end is provided with an electrical clamping head.

3 . The method for repairing the grounding lead of the cable head sheath with live electricity according to claim 2 , wherein the power connection clamping head comprises a first terminal lug of which one end is sleeved and fixed with the cable body, and the first wire connection The other end of the nose is provided with an accommodating groove, and two clamping plates are arranged in the accommodating groove, which are arranged opposite to each other. The side walls of the groove are hinged, the inner side of one end of the clamping plate protruding from the accommodating groove is provided with a clamping notch, and a clamping spring for pulling the two clamping plates to rotate oppositely is connected between the two clamping plates. .

4 . The method for repairing the grounding lead wire of the cable head sheath according to claim 3 , wherein the clamping plate is located at the inner side of one end of the accommodating groove and is provided with a plurality of engaging teeth. The meshing teeth mesh with each other.

5 . The method for repairing the grounding lead wire of the cable head sheath with live electricity according to claim 2 , wherein the grounding fixing mechanism comprises a U-shaped fixing seat, and the top and the bottom of the U-shaped fixing seat are provided with a fixing device in parallel. A splint, the fixed splint is slidably connected to the side of the U-shaped fixed seat, the top thread of the U-shaped fixed seat is threaded with a screw, and the screw is fixedly connected with the top of the fixed splint to drive the fixed splint along the U-shaped fixed base It also includes a second terminal lug, one end of which is fixedly sleeved with the cable body, and the other end of the second terminal lug is locked and fixed with the side of the U-shaped fixing seat by a fastener.

6 . The method for repairing the grounding lead of a cable head sheath with live electricity according to claim 1 , wherein the insulating wrench comprises an insulating handle and a wrench head arranged at one end of the insulating handle; the insulating clamp comprises a fixing arm, the The upper end of the fixed arm is provided with a clamp body, and the lower end of the fixed arm is provided with a driving mechanism for driving the action of the clamp body.

7 . The method for repairing the grounding lead of the cable head sheath with live electricity according to claim 6 , wherein a U-shaped hinge seat is fixedly connected to one end surface of the fixed arm close to the clamp body; the clamp body comprises two The movable arms are crossed in the middle. The middle of the two movable arms is located inside the U-shaped hinge seat and is hinged with the U-shaped hinge seat through the first hinge shaft. The upper end of the movable arm is provided with a pliers head, and the lower end is provided with a handle. The handle of the movable arm is connected with the driving mechanism.

8 . The live repair method for the grounding lead of the cable head sheath according to claim 7 , wherein the fixing arm is a tubular structure with an inner hollow; the driving mechanism comprises an operating handle located on the lower side of the fixing arm, and the The upper end of the operating handle is fixedly connected with a pull rod slidably arranged inside the fixed arm, the upper end of the pull rod is hinged with the lower ends of the two connecting rods distributed left and right, and the upper ends of the two connecting rods are respectively connected with the lower ends of the handles of the two movable arms. Hinged.

9 . The live repair method for the grounding lead of the cable head sheath according to claim 8 , wherein the upper end of the pull rod is provided with a U-shaped hinged recess, and the lower ends of the two connecting rods extend into the interior of the U-shaped hinged recess and The second hinge shaft is hinged with the U-shaped hinge recess; the left and right side walls of the upper end of the fixed arm are respectively provided with escape grooves to facilitate the extension of the connecting rod, and the escape grooves extend along the axis direction of the fixed arm; the operation The handle is annular; the lower end of the fixed arm is fixedly connected with an annular fixed handle, and the fixed pull glove is arranged on the outer side of the operation handle.

10 . The live repair method for the grounding lead of the cable head sheath according to claim 6 , wherein the insulating handle and the insulating clamp are made of phenolic epoxy resin glass fiber reinforced plastic. 11 .