Cable fault location detection system

Abstract

To provide a cable fault location detection system capable of detecting a fault in a line (cable) at an early stage.SOLUTION: The present invention relates to a cable fault location detection system (A) for detecting a fault in a cable, the system (A) including: a magnetic field measuring instrument (1) configured to measure a magnetic field generated by energization of a cable (5); and an information processing device (2) communicably connected to the magnetic field measuring instrument (1), the information processing device (2) being configured to determine whether a fault has occurred in the cable (5) on the basis of a plurality of measurement values related to the same measurement point of the cable (5) received from the magnetic field measuring instrument (1).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cable defect location detection system for detecting a defect location in a cable. [Background technology]

[0002] In underground power transmission lines, it is important to discover defects in the lines (cables) at an early stage before a ground fault occurs and take measures to prevent accidents from occurring, from the perspective of ensuring a stable supply of electricity and minimizing the scope of repairs and response costs.

[0003] For example, in the case of extra-high voltage CV cables, once an abnormality such as treeing (referring to the branch-like traces of insulation breakdown that occur in the insulation of plastic cables) is detected, it often progresses rapidly to a ground fault (ground fault trouble), making it difficult to resume power transmission once an abnormality such as treeing is detected.

[0004] On the other hand, if a defect in the line (cable) can be discovered at an early stage, it is possible to continue power transmission operations to a certain extent while arranging for repair materials, etc., and then repairing the defective area, thereby limiting the period of power transmission outage to the time required to repair the defective area.

[0005] The following three methods may be able to detect defects in the tracks (cables) at an early stage.

[0006] The "partial discharge measurement method" measures the discharge charge amount related to partial discharge generated from trees to detect the presence of tiny void-like defects and weak discharges; the "AE (acoustic emission) sensor measurement method" attaches a sensor to the surface of the cable and cable joints to detect abnormal sound waves to detect the presence of water trees (a condition in which insulation made of cross-linked polyethylene or other materials has been immersed in water for a long period of time or has been destroyed by some factor such as foreign matter or void gaps); and the "thermal camera investigation method" measures the surface temperature of the cable and cable joints to detect abnormalities caused by overheating.

[0007] For example, Patent Document 1 discloses the following configuration that uses an "AE sensor measurement method" to prevent sudden breakage of electric wires and provide a method for determining the fatigue of electric wires that can be performed while the wires are installed on utility poles, etc.

[0008] That is, the disclosed configuration involves repeatedly applying strain to an installed electric wire, detecting the AE waves generated from the wire with an AE sensor fixed to the wire and converting them into an electrical signal, passing the electrical signal through a filter that passes only specific frequency components and removes noise to extract only the AE signal, amplifying the AE signal from the filter, comparing the waves of the AE signal with a predetermined threshold value in a discrimination circuit, counting the number of waves that exceed the threshold value within a unit time, and displaying the oscillation rate on a display means, and then comparing the oscillation rate count value displayed on the display means with a preset life limit value from the oscillation rate count that changes as the fatigue of the electric wire progresses to determine the fatigue state of the electric wire. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 05-126707

[0010] However, the other two methods are expensive, so in practice, insulation resistance is measured with power transmission stopped during regular inspections of facilities, and if any signs of abnormality are found, thermal camera inspection is then carried out. DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0011] However, due to the structure of the cable, the partial temperature differences at the connection points that can be confirmed with a thermal camera can be several degrees Celsius even under normal conditions, depending on the thickness from the conductor to the cable surface and the installation position of the internal materials, so it is difficult to detect the occurrence of a malfunction unless the temperature difference becomes large.

[0012] Furthermore, after a defect in a line (cable) is discovered at an early stage, it is common to measure the cable's earth resistance and the current value flowing through the earth wire in order to determine the cause, and to investigate whether there are any factors that may have contributed to poor construction. However, the current situation is that construction quality control using checklists rarely reveals poor construction, and does not lead to the identification of the cause.

[0013] Therefore, in order to address the above-mentioned problems, an object of the present invention is to provide a cable fault location detection system that is capable of detecting faults in a line (cable) at an early stage. [Means for solving the problem]

[0014] In order to achieve the above object, the invention according to claim 1 comprises: A cable defect location detection system for detecting a defect in a cable, The system includes a magnetic field measuring device that measures a magnetic field generated by energizing a cable, and an information processing device that is communicably connected to the magnetic field measuring device, The information processing device is a cable defect location detection system that determines whether or not a defect has occurred in the cable based on multiple measurement values ​​related to the same measurement location on the cable received from the magnetic field measuring device.

[0015] The invention according to claim 2 is as follows: The information processing device is a cable fault detection system as described in claim 1, which determines that if any measurement value is three times or more higher than the other measurement values, it should consider reducing or stopping power transmission through the cable.

[0016] The invention according to claim 3 is as follows: The information processing device is a cable defect location detection system as described in claim 1 or 2, which determines that a detailed investigation of the cable is required if any of the measured values ​​is 1.5 times or more compared to the other measured values. [Effects of the Invention]

[0017] By using the cable defect location detection system according to the present invention, cable defects can be detected at an early stage in a simple manner without incurring high costs, which is convenient.

[0018] Furthermore, once a cable defect was detected using conventional methods, it was difficult to continue or resume power transmission because it was not possible to determine the extent of the cable defect and the resulting danger.

[0019] However, if the measured value of the defective part is less than three times the measured value of the surrounding parts, by combining magnetic field measurement using the cable defect detection system of the present invention and temperature measurement using a thermal camera investigation method, it is possible to confirm the relationship between magnetic field changes and temperature changes and grasp the progress of the defect in the cable.As a result, even after the defect is detected, it is possible to continue operating the cable to transmit electricity at temperatures below the allowable temperature of the conductor.

[0020] This type of operation will make it possible to avoid a situation where power transmission would have to be completely halted during the period until repair materials are arranged (for example, the manufacturing period for cables is approximately six months), leading to operations that minimize reductions in the supply of renewable energy. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a diagram showing an overall configuration of a cable defect location detection system according to a first embodiment of the present invention. [Figure 2] 1 is a diagram conceptually showing the overall configuration of a magnetic field measuring device of a cable fault location detection system according to a first embodiment of the present invention. [Figure 3] FIG. 10 is an explanatory diagram illustrating a situation when the magnitude of a magnetic field is detected using a magnetic field measuring device in the cable fault location detection system according to the other embodiment 1 of the present invention. [Figure 4] 1 is a diagram conceptually showing the overall configuration of an information processing device in a cable fault location detection system according to a first embodiment of the present invention. [Figure 5] 1 is a diagram schematically illustrating the configuration of a measurement value information storage area of ​​an information processing device in a cable defect point detection system according to a first embodiment of the present invention. FIG. [Figure 6] 3 is a flowchart illustrating a flow of processing executed by the cable defect point detection system according to the first embodiment of the present invention. [Figure 7] 1 is an explanatory diagram showing the overall configuration of a cable that is a detection target of a cable defect point detection system according to a first embodiment of the present invention, and the direction in which a magnetic field is measured. [Figure 8] 1 is an explanatory diagram showing the overall configuration of a cable that is a detection target of a cable defect point detection system according to a first embodiment of the present invention, and the direction in which a magnetic field is measured. [Figure 9]An explanatory diagram showing the state of the magnetic field generated around each cable and the state of the magnetic field generated around the cables, where (a) shows a normal state where there is no fault in the cable, and (b) shows a state where there is a fault in the cable. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the components described in the embodiment are merely examples and are not intended to limit the scope of the present invention.

[0023] <Embodiment Example 1> FIG. 1 is a diagram showing the overall configuration of a cable defect location detection system A according to the first embodiment.

[0024] As shown in Fig. 1, the cable defect location detection system A mainly comprises a magnetic field measuring device 1 that measures the magnitude of the magnetic field around a cable 5 such as a high-voltage or higher CV cable, and an information processing device 2. The magnetic field measuring device 1 and the information processing device 2 are connected to each other so as to be able to communicate with each other via a network 3. The network 3 is, for example, a wireless LAN or Bluetooth (registered trademark).

[0025] <Configuration of magnetic field measuring device 1> Next, the hardware configuration of the magnetic field measuring device 1 will be described with reference to FIG.

[0026] The magnetic field measuring device 1 mainly comprises a magnetic field detecting element 11, which may be a magnetoresistive element (MR), a magneto-impedance element (MI), a Hall element, or the like, and serves as a sensor for detecting the magnitude of the surrounding magnetic field; an amplifier circuit 12, which amplifies the measured value of the magnetic field output from the magnetic field detecting element 11; an A / D converter 13, which converts the amplified measured value into digital data; a memory unit 14, which may be a semiconductor memory device such as a flash memory or a solid-state drive (SSD) and stores the converted measured value; a control unit 15, which may be a CPU, MPU, FPGA, or other circuit, which controls the entire magnetic field measuring device 1; a display unit 16, which may be a liquid crystal display, an organic electroluminescence display, a dot-matrix display, or the like, and displays the measured value of the surrounding magnetic field; and an input unit 17, which may be a touch panel, buttons, or the like provided on the display unit 16, and receives commands and information from a user, such as a worker. The magnetic field detecting element 11, which serves as a sensor for detecting the magnitude of the surrounding magnetic field, is built into the tip 111 of the magnetic field measuring device 1.

[0027] When a command to detect the magnitude of the surrounding magnetic field is received from a user such as an operator via input means 17, control means 15 outputs the command to detect the magnitude of the surrounding magnetic field to magnetic field detection element 11. Upon receiving the command, magnetic field detection element 11 detects (measures) the magnitude of the surrounding magnetic field and outputs the measurement value (analog data) to amplifier circuit 12. Amplifier circuit 12 amplifies the received measurement value and outputs it to A / D converter 13. A / D converter 13 converts the measurement value (analog data) into measurement value (digital data). Control means 15 stores the measurement value (digital data) in memory means 14 and displays it on display means 16.

[0028] Moreover, the control means 15 outputs the measurement value (digital data) to the information processing device 2.

[0029] In the first embodiment, the configuration has been described in which three magnetic field detection elements 11 are provided for the three directions of X, Y, and Z. However, the present invention is not limited to this, and the number of magnetic field detection elements 11 can be selected from various numbers equal to or greater than two.

[0030] Furthermore, when multiple underground cables are transmitting power inside a manhole, it may be difficult to properly detect the magnetic field due to the influence of the magnetic fields of other circuits. Therefore, as shown in FIG. 3 , a skirt-shaped cover 18 made of a magnetic field-blocking material such as an amorphous sheet is attached to the magnetic field measuring device 1 so that the front of the tip 111 is left open and the outer periphery of the tip 111 is covered. Then, a magnetic field-blocking cover 19 such as an amorphous sheet is placed over the other circuits other than the circuit related to the target cable 5 whose magnetic field magnitude is to be detected. This allows the target magnetic field to be properly detected (measured) without being influenced by the magnetic fields generated by the other circuits around the circuit related to the target cable 5. Note that covering the other circuits with a cover 19 is desirable when the amount of current in the cable 5 is large and the surrounding magnetic field is strong. When the amount of current in the cable 5 is small and the surrounding magnetic field is weak, it is not necessary to cover the other circuits with a cover 19.

[0031] <Configuration of information processing device 2> The information processing device 2 is, for example, a tablet PC (=personal computer), a notebook PC, a smartphone, etc., and has the function of communicating with the magnetic field measuring device 1 and receiving measured values ​​related to the magnitude of the surrounding magnetic field. The information processing device 2 may be realized as a dedicated device specialized for functions related to the cable defect location detection system A, or may be realized by incorporating such functions into a general-purpose smartphone or tablet PC.

[0032] In addition, in this embodiment, the information processing device 2 is described assuming that it is a tablet PC. With a tablet PC, a user such as a worker can input commands and information by directly touching the screen with a finger, eliminating the need for a keyboard or pointing device. This makes it easy for a user such as a worker to input commands and information to the information processing device 2 on-site. In addition, the display magnification of information displayed on the screen can be conveniently changed by directly touching the screen with a finger.

[0033] Next, the hardware configuration of the information processing device 2 will be described with reference to Fig. 4. Fig. 4 is a conceptual diagram that schematically illustrates the hardware configuration of the information processing device 2.

[0034] In Figure 4, the control means 21 is realized, for example, by a CPU, and executes application programs, operating systems (OS), control programs, etc. stored in an SSD included in the storage means 22 described later, and controls the temporary storage of information, files, etc. necessary for executing the programs in the RAM included in the storage means 22.

[0035] In particular, when the control means 21 receives a measurement value relating to the magnitude of the magnetic field converted into digital data, it adds date and time information and stores it in the measurement value information storage area 221. Furthermore, when the control means 21 recognizes input from a user such as an operator via the input means 23 of the measurement position relating to the received measurement value and the transmission current value transmitted through the cable relating to the received measurement value, it stores the measurement position and the transmission current value in the measurement value information storage area 221 in association with the received measurement value.

[0036] Furthermore, the control means 21 makes a determination based on a comparison between a plurality of measurement values ​​relating to the same measurement position stored in the measurement value information storage area 221. This will be explained in detail below.

[0037] Furthermore, when the control means 21 compares multiple measurement values ​​relating to the same measurement position and finds that all of the measurement values ​​fall within a predetermined measurement error, it determines that there is "no abnormality." Note that "the same measurement position" refers to the same position on each cable, or the same position between each phase, that can be roughly connected by a line in the cross-sectional direction (width direction) of the cable, as shown by the dotted line 71 in Figure 1. Therefore, the measurement values ​​to be compared are the measurement values ​​between each phase, or the measurement values ​​between phases. Note that the "same measurement position" does not necessarily have to be on the line 71, but it is preferable to align it as closely as possible with the line 71.

[0038] Specifically, since cables 51 to 53 correspond to any of the three phases, the measurement value of each phase refers to the measurement value of cable 51 measured from the direction D1, the measurement value of cable 52 measured from the direction D3, and the measurement value of cable 53 measured from the direction D5 (see FIGS. 1 and 7), and for example, the control means 21 compares the measurement values ​​of cable 51 and cable 52. Furthermore, the interphase measurement value refers to the interphase measurement value of cables 51 and 52 measured from the direction D2, and the interphase measurement value of cables 52 and 53 measured from the direction D4 (see FIGS. 1 and 7), and for example, the interphase measurement value of cables 51 and 52 is compared with the interphase measurement value of cables 52 and 53.

[0039] The control means 21 may, for example, compare three measured values ​​or at least two measured values, i.e., may use a plurality of measured values ​​at the same measurement position for comparison.

[0040] Furthermore, when any measured value is compared with other measured values, the control means 21 determines that "monitoring is required" if the difference is large and the difference exceeds the measurement error and is less than 1.5 times. Furthermore, when any measured value is compared with other measured values, the control means 21 determines that "a detailed investigation should be conducted" if the difference is large and is 1.5 times or more but less than 3 times. Furthermore, when any measured value is compared with other measured values, the control means 21 determines that "consideration should be given to whether to suppress or stop power transmission" if the difference is large and is 3 times or more. Furthermore, the control means 21 displays the determination result on the display means 24.

[0041] The storage means 22 is for temporarily storing various types of information, and includes a RAM that functions as the main memory, work area, etc. of the control means 21, and a ROM that stores programs such as basic I / O programs and various types of information used in basic processing.

[0042] The storage means 22 has a solid state drive (SSD) that functions as a large-capacity memory, and this SSD is provided with a measurement value information storage area 221.

[0043] 5, measurement values ​​relating to the magnitude of the surrounding magnetic field received from the magnetic field measuring device 1 are stored in this measurement value information storage area 221 together with the measurement position, measurement direction, transmission current value, and date and time information. Fig. 5 shows an example in which measurement values ​​detected (measured) from the respective directions of D1 to D5 (see Fig. 7) at the same measurement position on line 71 (see Fig. 1) and measurement values ​​detected (measured) from the respective directions of D1 to D5 (see Fig. 7) at the same measurement position on line 72 (see Fig. 1) are stored.

[0044] The input means 23 is, for example, a touch panel, keyboard, pointing device, or button provided on the display means 24, and receives input of information and commands from users such as workers to the information processing device 2. In particular, the input means 23 receives input of the measurement date and time related to the received measurement value, the measurement position related to the received measurement value, the measurement direction related to the received measurement value, and the transmission current value transmitted through the cable related to the received measurement value.

[0045] The display means 24 is, for example, a liquid crystal display, an organic EL display, or a dot matrix display, and displays commands input through the input means 23 and the corresponding response output from the information processing device 2. In particular, the display means 24 displays the measurement values ​​and determination results relating to the magnitude of the surrounding magnetic field received from the magnetic field measuring device 1.

[0046] The timekeeping means 25 is, for example, a real-time clock, and keeps track of the current time.

[0047] The bus 27 controls the flow of information within the information processing device 2. The communication means 26 is an interface (I / F), and the information processing device 2 is connected via the communication means 26 by a wireless LAN or the like, and exchanges information with the magnetic field measuring device 1 and the like.

[0048] It should be noted that software that realizes the same functions as the above devices can be used instead of the hardware devices.

[0049] <Cable 5 Configuration> As shown in Figures 1, 7 and 8, the cables 5 to be measured are three bundled cables 5 (51, 52, 53) placed on a stand 6. There are three cables, cable 51, cable 52 and cable 53, because each cable corresponds to one of the three phases.

[0050] Next, the processing flow of the cable defect location detection system A will be described with reference to Fig. 6. Here, it is assumed that a user such as a worker detects (measures) a magnetic field at the same measurement position on the line 71 shown in Fig. 1.

[0051] A user such as a worker holds the magnetic field measuring device 1 in his / her hand and brings the magnetic field detection element 11 provided at the tip 111 of the magnetic field measuring device 1 close to one of the three bundled cables 5 (51, 52, 53). Then, he / she inputs a command to the magnetic field measuring device 1 to detect the strength of the surrounding magnetic field by, for example, pressing down the input means 17.

[0052] When the magnetic field measuring device 1 recognizes an input of a command from a user such as a worker (step S601), it detects (measures) the strength of the surrounding magnetic field (step S602) and outputs the measurement value (digital data) to the information processing device 2 (step S603).

[0053] When the information processing device 2 receives the measurement value (digital data), it stores the measurement value (digital data) in the measurement value information storage area 221 with date and time information (step S604). Furthermore, a user such as a worker stores the measurement date and time, the measurement position (measurement location), the measurement direction, and the transmission current value transmitted through the cable related to the measurement value in association with the measurement value received from the magnetic field measuring device 1 in the measurement value information storage area 221 (step S605). Note that the reason why a user such as a worker stores the transmission current value transmitted through the cable related to the measurement value is that it is necessary when identifying the cause of a cable malfunction. That is, it is necessary when appropriately determining whether the magnetic field is increasing due to a cable malfunction or a large current flow.

[0054] A user such as a worker detects (measures) the magnitude of the magnetic field around cables 51, 52, and 53 corresponding to each phase, as shown by D1, D3, and D5 in Fig. 7. Next, the user such as a worker detects (measures) the magnitude of the magnetic field around the phases, specifically, D2, which is the magnitude of the magnetic field around cables 51 and 52, and detects (measures) D4, which is the magnitude of the magnetic field around cables 52 and 53, as shown in Fig. 7. That is, the user such as a worker points the tip 111 of the magnetic field measuring device 1 in the directions of D1 to D5, respectively, and presses down the input means 17, causing cable fault location detection system A to perform the above-mentioned steps S601 to S605 five times.

[0055] 7 shows a configuration in which the magnitude of the surrounding magnetic field is detected (measured) from the directions of D1 to D5 to detect (measure) the magnitude of the surrounding magnetic field of each phase corresponding to the cables 51 to 53 and the magnitude of the surrounding magnetic field between the phases, but the present invention is not limited to this configuration. For example, as shown in FIG. 8, a configuration in which the magnitude of the surrounding magnetic field is detected (measured) from the directions of D1, D3, and D5 and from the directions of D6 to D9 may also be used.

[0056] The information processing device 2 searches the measurement values ​​stored in the measurement value information storage area 221, and if it recognizes that multiple measurement values ​​are stored for the same position ("YES" in step S606), it calls up the multiple measurement values, compares the measurement values, and makes a judgment based on the comparison results (step S607). Specifically, in this case, it compares the measurement values ​​for each of the three phases D1, D3, and D5 for the same position. Note that, since there are three phases, it is also possible to call up the measurement values ​​for any two phases and compare the measurement values. This is because a judgment can be made by comparing multiple measurement values. Furthermore, it compares the measurement values ​​for the two phases D2 and D4 for the same position. The information processing device 2 also displays the judgment results on the display means 24 (step S608).

[0057] In the above description, a user such as an operator detects (measures) the magnitude of the magnetic field around each of the phases D1, D3, and D5, and then detects (measures) the magnitude of the magnetic field around the phases D2 and D4. However, the number of directions to be measured and the order of the measurements are merely examples and are not limited to the above. A detailed description will be given below.

[0058] 9 is a diagram showing the state of the magnetic field generated around each cable 5 (each phase) and the state of the magnetic field generated around the cables 5 (between phases). Fig. 9(a) shows the magnetic field in a normal state where no malfunction occurs in any of the cables 5, and Fig. 9(b) shows the magnetic field in a state where a malfunction occurs in the cable 52.

[0059] For example, a user such as a worker uses a magnetic field measuring device 1 to detect (measure) the magnitude of the magnetic field around the phases D2 and D4, and the information processing device 2 compares the measured values ​​between the phases. As a result, as shown in FIG. 5, a determination result is obtained that the measured value of phase D2 between cables 51 and 52 is 1.5 times or more larger than the measured value of phase D4 between cables 52 and 53. Upon seeing this determination result, the user such as a worker concludes that the abnormality in the measured value of phase D2 indicates a problem with cable 51 or cable 52. Therefore, the user such as a worker uses the magnetic field measuring device 1 to detect (measure) the magnitude of the magnetic field around D1 and D3, and the information processing device 2 compares the measured value of the phase related to D1 with the measured value of the phase related to D3. As a result, as shown in FIG. 5, a determination result is obtained that the measured value of D3 between cable 52 is 1.5 times or more larger than the measured value of D1 between cable 51. From this determination result, the user such as a worker can identify the problem location by determining that a problem has occurred in cable 52.

[0060] In the above description, a flow has been shown in which a user such as a worker detects (measures) a magnetic field at the same measurement position on the straight line 71. If the user such as a worker detects (measures) a magnetic field at the same measurement position on the straight line 71 and finds no defects in the cables 51 to 53, the user such as a worker changes the measurement position and detects (measures) a magnetic field at the same measurement position on the straight line 72 (see FIG. 1), for example.

[0061] Also, in the above description, in S605, a configuration has been shown in which a user such as a worker stores, in association with a measurement value received from the magnetic field measuring device 1, the measurement date and time, the measurement position (measurement location), the measurement direction, and the transmission current value transmitted through the cable related to the measurement value in the measurement value information storage area 221. However, the transmission current value transmitted through the cable related to the measurement value may be stored in the measurement value information storage area 221 at the same timing as the measurement date and time, measurement location, and measurement direction, for example, after measuring the current transmitted through the cable with a measuring device such as a CT at the site where the measurement was performed, or may be stored in the measurement value information storage area 221 at a timing different from the measurement date and time, measurement location, and measurement direction, for example, at a later date.

[0062] In this way, by using the cable defect location detection system A, defects in the cable 5 can be detected at an early stage in a simple manner without incurring high costs, which is convenient.

[0063] Furthermore, once a defect in cable 5 is detected using conventional methods, it is difficult to continue or resume power transmission because it is not possible to determine the extent of the defect in cable 5 and the resulting danger.

[0064] However, if the measurement value of the defective part is less than three times the measurement value of the surrounding parts, by performing constant monitoring using a combination of magnetic field measurement using the cable defect detection system A and temperature measurement using the thermal camera investigation method, it is possible to confirm the relationship between magnetic field changes and temperature changes and grasp the progression of the defect in the cable 5. As a result, even after a defect has been detected, it is possible to continue transmitting electricity at temperatures below the allowable temperature of the conductor of the cable 5.

[0065] By making this type of operation possible, it will be possible to avoid a situation in which power transmission would have to be completely halted during the period until repair materials for Cable 5 are arranged (for example, the manufacturing period for Cable 5 is approximately six months), which will lead to operations that minimize reductions in the supply of renewable energy. [Explanation of symbols]

[0066] 1: magnetic field measuring device, 11: magnetic field detecting element, 111: tip portion, 12: amplifier circuit, 13: A / D converter, 14: storage means, 15: control means, 16: display means, 17: input means, 18: cover, 19: cover, 2: information processing device, 21: control means, 22: storage means, 221: measurement value information storage area, 23: input means, 24: display means, 25: timing means, 26: communication means, 27: bus, 5: Cable, 51: Cable, 52: Cable, 53: Cable, 6: stand, 71: Straight line, 72: Straight line

Claims

1. A cable defect location detection system for detecting a defect in a cable, The system includes a magnetic field measuring device that measures a magnetic field generated by energizing a cable, and an information processing device that is communicably connected to the magnetic field measuring device, The cable fault detection system is characterized in that the information processing device determines whether or not a fault has occurred in the cable based on multiple measurement values ​​relating to the same measurement point on the cable received from the magnetic field measuring device.

2. The cable fault detection system of claim 1, characterized in that the information processing device determines that if any measurement value is three times or more higher than the other measurement values, it should consider reducing or stopping power transmission through the cable.

3. 3. The cable fault location detection system according to claim 1, wherein the information processing device determines that a detailed investigation of the cable is required if any of the measured values ​​is 1.5 times or more the other measured values.

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