Method for periodically diagnosing and repairing cable

Abstract

A method for diagnosing and repairing a cable is provided. The cable diagnosis and repair device comprises a cover body, an illuminance meter, an insulation coating machine, a power supply unit, and a portable terminal. The cover body is composed of a semi-cylindrical tubular body to surround a portion of the cable. The illuminance meter is equipped with a scanner housing, a laser light source-lens assembly, and a detection unit, and measures the surface roughness of the cable sheath. The insulation coating machine is equipped with a tank for storing an insulation coating liquid, a regulator for controlling the discharge of the insulation coating liquid, and a nozzle unit for applying the insulation coating liquid to the surface of the cable requiring repair. The portable terminal diagnoses the condition of the cable sheath from the measurement results of the illuminance meter and controls the operation of the insulation coating liquid.

Description

Technology Field

[0001] The present invention relates to a cable diagnosis and repair method, and more specifically, to a cable diagnosis and repair method capable of repairing a cable by periodically diagnosing the condition of the cable sheath using a cable diagnosis and repair device. Background Technology

[0002] Cables are cables used for power transmission or power supply in power transmission and distribution panels. Polyethylene insulated vinyl sheath cables and cross-linked polyethylene cables are mainly used for underground lines in premises distribution, and 600V insulated vinyl sheath cables are used for low-voltage indoor wiring.

[0003] The surface condition of the cable insulation sheath deteriorates or cracks over time due to the surrounding environment. In the case of cables within underground power conduits, wrinkles may form on the sheath surface as dehiscence occurs repeatedly due to temperature changes. When cables are laid within power conduits, contaminants such as moisture and dust can continuously accumulate in the gaps of minute damage caused by friction with the ground, thereby accelerating sheath damage.

[0004] Mortar dust can accumulate on cable surfaces due to the gradual deterioration and spalling of the mortar on the concrete surface of power conduit structures. This accumulated dust combines with moisture from condensation and remains attached to the cable surface for an extended period, causing damage. Additionally, flooded power conduits damage cable surfaces due to moisture and soil.

[0005] Figure 7 is a photograph showing a tree growing on the outer sheath of a cable's insulation, and Figure 8 is a photograph showing an electrical tree phenomenon on the surface of the cable sheath. Figure 9 is a photograph showing the delamination phenomenon of the internal structure of the power conduit, and Figure 10 is a photograph showing dust accumulated on the cable sheath.

[0006] As such, cables are exposed to continuous damage factors, yet there is a lack of means to inspect them before they are selected for Very Low Frequency (VLF) periodic diagnosis. The problem to be solved

[0007] The present invention aims to provide a cable diagnosis and repair device capable of automatically diagnosing a cable and automatically repairing the cable sheath when repair is required, and a cable diagnosis and repair method using the same. means of solving the problem

[0008] A cable diagnosis and repair device according to one embodiment of the present invention comprises a cover body configured to surround a portion of a cable, an illuminance meter provided on one side in the longitudinal direction of the cover body, and an insulation coating device provided on the other side in the longitudinal direction of the cover body. The illuminance meter is equipped with a laser light source-lens assembly and a detection unit, and measures the surface roughness of the cable sheath using an optical interference method. The insulation coating device is equipped with a tank for storing an insulation coating liquid and a nozzle unit that receives the insulation coating liquid from the tank and applies the insulation coating liquid to the surface of a cable requiring repair.

[0009] The cover body may be composed of a semi-cylindrical tubular body, and a height-adjustable handle may be provided on the outer surface of the cover body. Shield flanges may be provided at both ends of the cover body along the circumferential direction, and a plurality of rollers that roll in contact with a cable may be located at either the bottom of the cover body or the inner surface of the shield flange.

[0010] The laser light source-lens assembly can be positioned linearly along the circumferential direction on the inner surface of the cover body, and the detector can measure surface roughness by analyzing laser light reflected from the cable surface. The insulation coating machine may include a heater located on the inner surface of the cover body that applies heat to the cable coated with insulation coating liquid to dry the insulation coating liquid.

[0011] A cable diagnosis and repair device according to another embodiment of the present invention comprises a cover body, an illuminance meter, an insulation coating machine, a power supply unit, and a portable terminal. The cover body is composed of a semi-cylindrical tubular body to surround a portion of the cable. The illuminance meter is provided in the cover body and comprises a scanner housing, a laser light source-lens assembly, and a detection unit, and measures the surface roughness of the cable sheath. The insulation coating machine is provided in the cover body and comprises a tank for storing an insulation coating liquid, a regulator for controlling the discharge of the insulation coating liquid, and a nozzle unit for applying the insulation coating liquid to the surface of the cable requiring repair. The power supply unit supplies electricity to the illuminance meter and the insulation coating machine. The portable terminal is electrically connected to the illuminance meter and the insulation coating machine, diagnoses the condition of the cable sheath from the measurement results of the illuminance meter, and controls the operation of the insulation coating machine.

[0012] A height-adjustable handle may be provided on the outer surface of the cover body, and the cover body moves along the length of the cable by an external force on the cable, allowing the surface roughness of the illuminance meter to be measured.

[0013] The scanner enclosure may be provided on the front outer surface of the cover body, and the detector and power supply may be located inside the scanner enclosure. The laser light source-lens assembly may be installed linearly along the circumferential direction on the inner surface of the cover body.

[0014] The tank may be provided on the rear outer surface of the cover body, and a regulator may be installed at the tank's outlet to control whether the outlet is open, the opening time, and the discharge pressure of the insulating coating liquid.

[0015] The nozzle section may include a pipe connected to a tank to deliver an insulating coating liquid, and a plurality of nozzles located along the pipe and exposed on the inner surface of the cover body. The pipe may include a main pipe located along the circumferential direction of the cover body and a plurality of auxiliary pipes extending from the main pipe along the longitudinal direction of the cover body, and the plurality of nozzles may be located at a certain distance along the longitudinal direction of the plurality of auxiliary pipes.

[0016] The insulating coating machine may include a heater composed of a plurality of heating wires located between a plurality of nozzles on the inner surface of the cover body.

[0017] The portable terminal can be connected to an illuminance meter and an insulation coating device via either wired or wireless communication, and may include a display that receives and displays the scan results of the detection unit in real time.

[0018] A portable terminal may include a memory that stores the thickness of a cable to be diagnosed and a reference thickness of the cable sheath, and a diagnostic unit that compares surface roughness information output by a detection unit with the reference thickness of the sheath and outputs an operation signal to an insulation coating machine when the measured surface roughness is greater than the reference thickness of the sheath.

[0019] The portable terminal may include a control unit that outputs a control signal to a controller when the insulating coating machine is operating to control the discharge amount, discharge time, and discharge pressure of the insulating coating liquid.

[0020] A cable diagnosis and repair method according to one embodiment of the present invention comprises: a setting step in which the thickness of a cable to be diagnosed and a reference thickness of the outer sheath are set in a portable terminal; a diagnosis step in which a cover body moves along the length direction of the cable and an illuminance meter measures the surface roughness of the cable outer sheath to diagnose the condition of the cable outer sheath; and a repair step in which, if damage to the cable outer sheath is detected in the diagnosis step, an insulation coating machine operates to apply an insulation coating liquid to the damaged area.

[0021] In the diagnostic phase, the operation of the illuminance meter can be started after the cover body is placed on the cable, and the cover body moves along the length of the cable so that surface roughness measurement can be performed in real time along the length of the cable.

[0022] In the diagnosis phase, the portable terminal compares the surface roughness output by the illuminance meter with the reference thickness of the outer sheath input in the setting phase, and when the measured surface roughness is greater than the reference thickness of the outer sheath, it can diagnose that the cable outer sheath is damaged and output an alarm signal to stop the movement of the cover body.

[0023] During the maintenance phase, the portable terminal can control the discharge amount, discharge time, and discharge pressure of the insulating coating liquid by outputting a control signal to a controller. The insulating coating machine may include a heater, and during the maintenance phase, the portable terminal can heat-treat the insulating coating liquid by operating the heater after the application of the insulating coating liquid is completed.

[0024] Three cables can form a triangular arrangement structure, and the diagnosis and repair stages can be performed three times for the upper, left, and right parts of the cable arrangement structure. Effects of the invention

[0025] According to the embodiments, the condition of the cable sheath can be periodically diagnosed, and cables with detected damage can be repaired at the diagnosis site. In addition, diagnosis results can be accumulated and utilized when selecting targets for Very Low Frequency (VLF) diagnosis, and when selecting cables for VLF diagnosis, cables with good sheath conditions can be used as an indicator to extend the diagnosis cycle. Brief explanation of the drawing

[0026] FIG. 1 is a perspective view of a cable diagnosis and repair device according to one embodiment of the present invention. Figure 2 is a bottom view of the cable diagnosis and repair device illustrated in Figure 1. Figure 3 is a schematic diagram showing the usage status of the cable diagnosis and repair device illustrated in Figure 1. Figure 4 is a schematic diagram showing the surface pattern of a test object obtained with a conventional optical interferometer illuminance meter. FIG. 5 is a flowchart illustrating a cable diagnosis and repair method according to one embodiment of the present invention. Figure 6 is a schematic diagram showing the cable condition before and after the repair phase. Figure 7 is a photograph showing a tree grown on the outer sheath of the cable's insulation. Figure 8 is a photograph showing the electrical tree phenomenon on the surface of the cable sheath. Figure 9 is a photograph showing the delamination phenomenon of the internal structure of the power conduit. Figure 10 is a photograph showing dust accumulated on the cable sheath. Specific details for implementing the invention

[0027] The technical terms used herein are for the reference of specific embodiments only and are not intended to limit the invention. The singular forms used herein include plural forms unless phrases clearly indicate otherwise. The meaning of "comprising" as used in the specification specifies a particular characteristic, area, integer, step, action, element, and / or component, and does not exclude the presence or addition of other particular characteristic, area, integer, step, action, element, component, and / or group.

[0028] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries are further interpreted to have meanings consistent with relevant technical literature and the present disclosure, and are not interpreted in an ideal or highly formal sense unless otherwise defined.

[0029] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0030] FIG. 1 is a perspective view of a cable diagnosis and repair device according to one embodiment of the present invention, FIG. 2 is a bottom view of the cable diagnosis and repair device shown in FIG. 1, and FIG. 3 is a schematic diagram showing the usage state of the cable diagnosis and repair device shown in FIG. 1.

[0031] Referring to FIGS. 1 to 3, a cable diagnosis and repair device (100) according to one embodiment includes a cover body (10) configured to surround a part of a cable (200), an illuminance meter (20), an insulation coating device (30), and a power supply unit (40) installed on the cover body (10), and a portable terminal (50) electrically connected to the illuminance meter (20) and the insulation coating device (30).

[0032] The cover body (10) may be composed of a semi-cylindrical tubular body having a predetermined diameter and a predetermined length corresponding to the diameter of the cable (200) to be diagnosed, and the cable (200) to be diagnosed is positioned within the internal space. That is, the cover body (10) is positioned to cover a specific section of the cable (200) for a cable (200) that is arranged in a long straight line.

[0033] A handle (11) may be positioned on the outer surface of the cover body (10). The handle (11) helps the worker move the cover body (10) along the length of the cable (200). The handle (11) is ergonomically designed to be suitable for the worker to grip with their hand and may be configured to be height-adjustable by means of a link (12).

[0034] An illuminance meter (20) is provided on one side in the longitudinal direction of the cover body (10). The illuminance meter (20) includes a scanner housing (21), a laser light source-lens assembly (22), and a detector (23), and measures the surface roughness of the outer sheath of the cable (200) using an optical interference method. The optical interference method is a method for measuring surface roughness by observing interference patterns based on the difference in the optical path of light, and is used for measuring the roughness of a relatively fine surface with an irregularity height of 1 μm or less.

[0035] A laser light source-lens assembly (22) may be provided linearly along the circumferential direction on the inner surface of the cover body (10) so as to simultaneously scan the surface of the cable (200) along the circumferential direction of the cable (200). The laser light source emits laser light, and the lens irradiates the laser light onto the surface of the cable (200) while simultaneously transmitting the laser light reflected from the surface of the cable (200) to the detector (23). The lens may include a beam splitter, a half mirror, an eyepiece, and an objective lens.

[0036] The scanner housing (21) may be provided at the front of the cover body (10), and the detector (23) and power supply (40) may be located inside the scanner housing (21). The detector (23) measures surface roughness by analyzing laser light reflected from the surface of the cable (200). The power supply (40) supplies electricity to the laser light source-lens assembly (22) and the detector (23), and may be composed of a conventional battery.

[0037] Figure 4 is a schematic diagram showing the surface pattern of a test object obtained with a conventional optical interferometer illuminance meter.

[0038] Referring to Fig. 4, when the wavelength of light is denoted by λ, the width of the interference fringe is denoted by a, and the amount of bending of the interference fringe is denoted by b, the surface roughness Ry is expressed by the following mathematical formula. Here, Ry is the maximum height roughness and represents the distance between two parallel lines tangent to the highest peak and the deepest valley in the cross-sectional profile of the workpiece.

[0039]

[0040] Referring again to FIGS. 1 to 3, a plurality of rollers (13) for preventing friction may be provided at the bottom of the cover body (10). The plurality of rollers (13) may be made of synthetic rubber such as urethane and come into contact with the cable (200) instead of the cover body (10). The plurality of rollers (13) facilitate the movement of the cover body (10) and reduce friction with the cable (200), thereby preventing surface damage to the cable (200).

[0041] Additionally, shield flanges (14) may be positioned at both ends of the cover body (10) along the circumferential direction. The shield flanges (14) may be composed of flat rectangular plates and may be positioned at a predetermined angle downward from the cover body (10).

[0042] The shield flange (14) prevents foreign matter from penetrating into the interior of the cover body (10) during cable diagnosis and functions to increase the tightness between the cover body (10) and the cable (200) when the cover body (10) moves. The shield flange (14) may be made of a polymer material, and a plurality of rollers (13) may be provided on the underside of the shield flange (14) instead of the bottom of the cover body (10).

[0043] An insulating coating machine (30) is provided on the other side in the longitudinal direction of the cover body (10). The insulating coating machine (30) may include a tank (31) for storing insulating coating liquid, a regulator (32) installed at the discharge port of the tank (31) for controlling whether to discharge insulating coating liquid and the discharge pressure, a nozzle part (33) for receiving insulating coating liquid from the tank (31) and applying insulating coating liquid to the surface of a cable (200) requiring repair, and a heater (36) for drying insulating coating liquid by applying heat to the cable (200) to which insulating coating liquid has been applied.

[0044] A tank (31) may be provided at the rear of the cover body (10) and stores an insulating coating liquid inside. The insulating coating liquid is an insulating liquid containing insulating components and adhesive components, and functions to maintain the insulation condition of the cable (200) sheath in good condition after being applied to the damaged part of the cable sheath (200) and dried.

[0045] A regulator (32) is installed at the outlet where the insulating coating liquid is discharged from the tank (31) and controls whether the outlet is open, the opening time, and the discharge pressure of the insulating coating liquid. The regulator (32) may be an air pressure regulator using compressed air, but is not limited to such examples.

[0046] The nozzle section (33) may be composed of a pipe (34) connected to a tank (31) to deliver an insulating coating liquid, and a plurality of nozzles (35) located along the pipe (34) and exposed to the inner surface of the cover body (10) to spray the insulating coating liquid toward the outer sheath of the cable (200). For example, the pipe (34) may include a main pipe (341) located along the circumferential direction of the cover body (10) and a plurality of auxiliary pipes (342) extended from the main pipe (341) along the longitudinal direction of the cover body (10).

[0047] Multiple auxiliary pipes (342) may be positioned side by side at a certain distance from each other, and multiple outlets (35) may be positioned at a certain distance from each other along the length direction of the multiple auxiliary pipes (342). The area where the multiple outlets (35) are located becomes a coating area where an insulating coating liquid is applied to the outer sheath of the cable (200).

[0048] The heater (36) may be made of known heating wires and may be located between a plurality of outlets (35) on the inner surface of the cover body (10). For example, the heater (36) may be composed of a plurality of heating wires arranged parallel to the circumferential direction of the cover body (10) between the plurality of outlets (35). The aforementioned controller (32) and heater (36) are connected to a power supply unit (40) and receive electricity necessary for operation from the power supply unit (40).

[0049] The portable terminal (50) includes a display (51) and is electrically connected to the illuminance meter (20) and the insulating coating machine (30) via wired or wireless communication. In FIG. 1, an example is illustrated in which the portable terminal (50) is wired to the illuminance meter (20) and the insulating coating machine (30) via a first connecting line (52) and a second connecting line (53).

[0050] The portable terminal (50) is electrically connected to the laser light source-lens assembly (22) of the illuminance meter (20) to control the on / off of the laser light source and the output of the laser light. The portable terminal (50) is electrically connected to the detection unit (23) of the illuminance meter (20) and can receive the scan results of the detection unit (23) in real time and output the results to the display (51).

[0051] The portable terminal (50) may include a memory (not shown) and a diagnostic unit (not shown). Information regarding the thickness of the cable (200) and the thickness of the outer sheath of the cable (200) is stored in the memory. The diagnostic unit compares the surface roughness information of the cable (200) output by the detection unit (23) of the illuminance meter (20) with the thickness of the outer sheath of the cable (200) stored in the memory, and diagnoses whether there is a case where the measured surface roughness is greater than the thickness of the outer sheath of the cable (200).

[0052] When the measured surface roughness is greater than the thickness of the outer sheath of the cable (200), it means that the outer sheath of the cable (200) is damaged and repair of the cable (200) is required at that part. When the measured surface roughness is greater than the thickness of the outer sheath of the cable (200), the diagnostic unit outputs an alarm signal to cause the operator to stop moving the cover body (10) and can output an operation signal to the controller (32) of the insulation coating machine (30).

[0053] The portable terminal (50) may further include a control unit (not shown) electrically connected to a controller (32) of the insulating coating machine (30). The control unit can output a control signal to the controller (32) when the insulating coating machine (30) is operating to precisely control the discharge amount, discharge time, and discharge pressure of the insulating coating liquid. At this time, the control unit is electrically connected to a heater (36) to control the on / off status, heat generation amount, and operating time of the heater (36).

[0054] FIG. 5 is a flowchart illustrating a cable diagnosis and repair method according to an embodiment of the present invention using the aforementioned cable diagnosis and repair device.

[0055] Referring to FIG. 5, a cable diagnosis and repair method according to one embodiment includes a setting step (S10) in which the thickness of the cable and the reference thickness of the outer sheath are set in a portable terminal, a diagnosis step (S20) in which a cover body moves along the length direction of the cable and an illuminance meter diagnoses the surface condition of the cable outer sheath, and a repair step (S30) in which, if damage to the cable outer sheath is detected in the diagnosis step, an insulating coating part operates to apply an insulating coating liquid to the damaged area.

[0056] Referring to FIGS. 1 to 3, a preparation step may be performed prior to the setting step (S10). The preparation step may include processes such as determining the diagnostic section, charging the power supply (40), and checking the storage status of the insulating coating liquid. In the setting step (S10), the diagnostician moves to the planned section and sets the thickness of the cable (200) to be diagnosed and the reference thickness of the outer sheath on the portable terminal (50).

[0057] In the diagnostic step (S20), the cover body (10) is placed on the cable (200), and the operation of the illuminance meter (20) begins. A diagnostic assistant can move the cover body (10) along the length of the cable (200) by holding the handle (11) of the cover body (10), and the diagnostician can move along with the diagnostic assistant while holding a portable terminal (50).

[0058] As the cover body (10) moves, the illuminance meter (20) measures the surface roughness of the cable (200) in real time along the length direction of the cable (200), and the measurement result is displayed on the display of the portable terminal.

[0059] In the diagnosis step (S20), the diagnosis unit of the portable terminal (50) compares the surface roughness of the cable (200) output by the illuminance meter (20) with the reference thickness of the outer sheath input in the setting step (S10), and diagnoses that the outer sheath of the cable (200) is damaged when the measured surface roughness is greater than the reference thickness of the outer sheath input. At this time, the diagnosis unit may output an alarm signal to cause an auxiliary diagnostician to stop moving the cover body (10).

[0060] Figure 6 is a schematic diagram showing the cable condition before and after the repair phase.

[0061] Referring to FIGS. 1 to 3 and FIG. 6, in the repair step (S30), an insulating coating liquid is applied to the damaged area of ​​the outer shell by operating an insulating coating machine (30), and then the insulating coating liquid is dried by heat treatment by operating a heater (36). The operation of the insulating coating machine (30) can be controlled by a diagnostician.

[0062] For example, the diagnostician can precisely control the discharge amount, discharge time, and discharge pressure of the insulating coating liquid by controlling the controller (32) of the insulating coating machine (30) using a portable terminal (50), and can also precisely control the amount of heat generated and the operating time of the heater (36).

[0063] The insulating coating liquid applied to the outer sheath of the cable (200) is dried by heat treatment to form an insulating layer (60) on the surface of the outer sheath, and this insulating layer (60) covers the damaged part of the outer sheath to repair the cable (200).

[0064] When the repair of the cable (200) is completed, the diagnostic assistant moves the cover body (10) again, and the diagnostic step (S20) in which the illuminance meter (20) measures the surface roughness of the outer sheath of the cable (200) is repeated. The diagnostic step (S20) and the repair step (S30) are repeated throughout the entire diagnostic section, and all diagnostic and repair data from the diagnostic starting point to the diagnostic end point are stored in the portable terminal (50).

[0065] Meanwhile, in the diagnostic section, three cables (200) can be arranged in an equilateral triangle (see FIG. 3), and in this case, the diagnostic step (S20) and the repair step (S30) can be performed three times for the upper part, the left part, and the right part of the cable arrangement structure.

[0066] According to the embodiments described above, the condition of the outer sheath of the cable (200) can be periodically diagnosed, and the cable (200) in which damage is detected at the diagnosis site can be repaired. In addition, the diagnosis results can be accumulated and utilized when selecting a target for VLF (Very Low Frequency) diagnosis, and when selecting a cable for VLF diagnosis, a cable (200) with a good outer sheath condition can be used as an indicator to extend the diagnosis cycle.

[0067] Although the present invention has been described as previously stated, those skilled in the art will readily understand that various modifications and variations are possible without departing from the concept and scope of the claims set forth below. Explanation of the symbols

[0068] 100: Cable diagnosis and repair device 200: Cable 10: Cover body 11: Handle 20: Illuminance meter 21: Scanner enclosure 22: Laser light source-lens assembly 23: Detector 30: Insulation coating machine 31: Tank 32: Controller 33: Nozzle part 34: Piping 35: Outlet 36: Heater 40: Power supply 50: Portable terminal 51: Display 60: Insulating layer

Claims

Claim 1 A cable diagnosis and repair method using a cable diagnosis and repair device, wherein the cable diagnosis and repair device comprises: a cover body composed of a semicylindrical tubular body to surround a portion of the cable; an illuminance meter provided on one side in the longitudinal direction of the cover body, equipped with a scanner housing, a laser light source-lens assembly, and a detection unit, for measuring the surface roughness of the cable sheath; an insulation coating machine provided on the other side in the longitudinal direction of the cover body, equipped with a tank for storing an insulation coating liquid, a regulator for controlling the discharge of the insulation coating liquid, and a nozzle unit for applying the insulation coating liquid to the surface of the cable requiring repair; and a power supply unit for supplying electricity to the illuminance meter and the insulation coating machine.The method includes a portable terminal that is electrically connected to the illuminance meter and the insulation coating machine, diagnoses the condition of the cable sheath from the measurement results of the illuminance meter, and controls the operation of the insulation coating machine; a height-adjustable handle is provided on the outer surface of the cover body, and the cover body moves along the length direction of the cable by an external force on the cable, and the surface roughness measurement of the illuminance meter is performed; the nozzle part includes a pipe connected to the tank to deliver the insulation coating liquid, and a plurality of ejection ports located along the pipe and exposed on the inner surface of the cover body; the insulation coating machine includes a heater composed of a plurality of heating wires located between the plurality of ejection ports on the inner surface of the cover body; the portable terminal is connected to the illuminance meter and the insulation coating machine by either wired or wireless communication, and includes a display that receives and displays the scan results of the detection unit in real time; the cable diagnosis and repair method includes a setting step in which the thickness of the cable to be diagnosed and the reference thickness of the sheath are set in the portable terminal, and the cover body moves along the length direction of the cable while the illuminance meter measures the surface roughness of the cable sheath, and the cable A cable diagnosis and repair method comprising a diagnosis step for diagnosing the condition of the outer sheath, and a repair step in which, if damage to the cable outer sheath is detected in the diagnosis step, the insulation coating machine operates to apply an insulation coating liquid to the damaged area. Claim 2 A cable diagnosis and repair method according to claim 1, wherein, in the repair step, the portable terminal outputs a control signal to the regulator to control the discharge amount, discharge time, and discharge pressure of the insulating coating liquid.

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