Cable defect positioning system

Abstract

The utility model provides a cable defect positioning system, and belongs to the technical field of cable detection. The cable defect positioning system comprises a direct-current high-voltage generation module, an arc detection module, a key switch, a control switch, a low-frequency signal generation module, a low-frequency signal detection module and a main control module, the first end of the key switch is connected with a power supply, and the second end of the key switch is connected with the power supply ends of the direct-current high-voltage generation module and the arc detection module; the direct-current high-voltage generation module, the arc detection module, the low-frequency signal generation module and the low-frequency signal detection module are all connected with the main control module; the first end of the control switch is connected with the second end of the key switch, the second end of the control switch is connected with the power supply end of the low-frequency signal detection module, and the control end of the control switch is connected with the main control module. The problem that traditional cable defect detection is insufficient in accuracy can be solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of cable detection, and in particular to a cable defect location system. Background Art

[0002] In 10kV / 6kV power supply systems, single-phase ground faults are a high risk, typically accounting for approximately 70% of all power supply system failures. Power supply incidents often progress from single-phase ground faults to interphase short circuits, causing widespread power outages, equipment damage, and casualties. Cable defects are a key cause of single-phase ground faults.

[0003] Cables are essential carriers for transmitting electrical energy and signals, and their operational status is directly related to the stability and safety of the entire system. However, due to their long-term exposure to complex environments, cables are susceptible to various factors, leading to defects such as insulation aging, damage, and poor contact. These defects not only reduce cable transmission efficiency but can also cause serious safety incidents, posing a significant threat to human life and property. Traditional cable defect detection methods mostly rely on manual inspections and offline testing, which suffer from long detection cycles, low efficiency, and insufficient accuracy. Utility Model Content

[0004] The embodiments of the present disclosure provide a cable defect location system to solve the problem of insufficient accuracy in traditional cable defect detection.

[0005] The present disclosure provides a cable defect location system, including:

[0006] DC high voltage generation module, arc detection module, key switch, control switch, low frequency signal generation module, low frequency signal detection module and main control module;

[0007] The first end of the key switch is used to connect to a power supply, and the second end of the key switch is connected to the power supply ends of the DC high voltage generating module and the arc detection module respectively;

[0008] The DC high voltage generating module, the arc detecting module, the low frequency signal generating module and the low frequency signal detecting module are all connected to the main control module;

[0009] The first end of the control switch is connected to the second end of the key switch, the second end of the control switch is connected to the power supply end of the low-frequency signal detection module, and the control end of the control switch is connected to the main control module;

[0010] The DC high-voltage generating module is configured to inject a high-voltage DC signal into the cable under test, the arc detection module is configured to detect the arc generated by the cable under test, the low-frequency signal generating module is configured to inject a low-frequency signal into the cable under test, and the low-frequency signal detection module is configured to detect the reflected low-frequency signal.

[0011] In an exemplary embodiment of the present disclosure, the DC high voltage generating module includes: a capacitor C2, a first discharge tube U1, a second discharge tube U2, a first transformer T1, a second transformer T2, a switch tube Q1, a resistor R1 and a capacitor C3;

[0012] The first end of the capacitor C2 is used to connect to the positive electrode of the external DC power supply, and the second end of the capacitor C2 is used to connect to the negative electrode of the external DC power supply. The first input end of the transformer T1 is connected to the first end of the capacitor C2. The second input end of the first transformer T1 is connected to the first end of the second discharge tube U2 through the first discharge tube U1. The second end of the second discharge tube U2 is connected to the second end of the capacitor C2.

[0013] The first output end of the transformer T1 is connected to the first end of the resistor R1, the second end of the resistor R1 is grounded via the capacitor C3, the second end of the resistor R1 is used to output a high-voltage DC signal, and the second output end of the transformer T1 is grounded;

[0014] The first input end of the transformer T2 is connected to the second input end of the first transformer T1, the second input end of the transformer T2 is connected to the first end of the second discharge tube U2, the first output end of the transformer T2 is connected to the second end of the key switch, the second output end of the transformer T2 is connected to the first end of the switch tube Q1, the second end of the switch tube Q1 is grounded, and the control end of the switch tube Q1 is connected to the main control module.

[0015] In an exemplary embodiment of the present disclosure, the DC high voltage generating module further includes: a switch tube Q2, a resistor R2, a switch tube Q3 and a variable resistor RP1;

[0016] The first end of the switch tube Q2 is connected to the second end of the resistor R1, and the second end of the switch tube Q2 is used to output a high-voltage DC signal. The control end of the switch tube Q2 is connected to the first end of the switch tube Q3 through the resistor R2, and the second end of the switch tube Q3 is grounded. The control end of the switch tube Q3 is connected to the sliding end of the resistor RP1, the first end of the resistor RP1 is connected to the second end of the switch tube Q2, and the second end of the resistor RP1 is grounded.

[0017] In an exemplary embodiment of the present disclosure, the arc detection module includes: a detection coil U5, a resistor R5, a resistor R6, a resistor R7 and an operational amplifier U3;

[0018] The first end of the detection coil U5 is connected to the inverting input end of the operational amplifier U3 through the resistor R5, the second end of the detection coil U5 is grounded, the non-inverting input end of the operational amplifier U3 is grounded through the resistor R7, the output end of the operational amplifier U3 is connected to the inverting input end of the operational amplifier U3 through the resistor R6, and the output end of the operational amplifier U3 is connected to the main control module.

[0019] In an exemplary embodiment of the present disclosure, the arc detection module further includes: an operational amplifier U4, a resistor R9, and a capacitor C8;

[0020] The non-inverting input terminal of the operational amplifier U4 is connected to the output terminal of the operational amplifier U3, the output terminal of the operational amplifier U4 is connected to the inverting input terminal of the operational amplifier U4, the output terminal of the operational amplifier U4 is connected to the first end of the resistor R9, the second end of the resistor R9 is grounded through the capacitor C8, and the second end of the resistor R9 is connected to the main control module.

[0021] In an exemplary embodiment of the present disclosure, it further includes: an alarm module;

[0022] The alarm module is connected to the main control module.

[0023] In an exemplary embodiment of the present disclosure, it further includes: a wireless communication module;

[0024] The main control module is connected to the monitoring platform through the wireless communication module.

[0025] The beneficial effects of the cable defect location system provided by the embodiment of the present disclosure are as follows: the embodiment of the present disclosure injects a high-voltage DC signal into the cable under test through the DC high-voltage generating module, and cooperates with the arc detection module to accurately detect the arc generated by the cable, so as to quickly discover potential defects in the cable. The low-frequency signal generating module and the low-frequency signal detection module work together to accurately locate the cable fault point. Compared with traditional detection methods, the embodiment of the present disclosure does not require manual inspections and offline testing, shortens the detection cycle, and improves detection efficiency and accuracy. It can detect cable defects in a timely manner, avoid serious accidents such as single-phase grounding caused by cable problems and then turning into phase-to-phase short circuits, and ensure the stable operation of the power supply system and the safety of people's lives and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 is a structural diagram of a cable defect location system provided by an embodiment of the present disclosure;

[0028] Figure 2 is a circuit diagram of a DC high voltage generating module provided in an embodiment of the present disclosure;

[0029] Figure 3 is a circuit diagram of an arc detection module provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] To help those skilled in the art better understand this solution, the following will clearly describe the technical solutions in the embodiments of this solution in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of this solution, not all of it. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of this solution.

[0031] Throughout the specification, claims, and accompanying figures of this solution, the term "including" and any variations thereof mean "including, but not limited to," and are intended to cover non-exclusive inclusions and are not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish between different objects, not to describe a specific order.

[0032] The following describes the implementation of the present disclosure in detail with reference to the accompanying drawings:

[0033] Figure 1 This is a schematic diagram of the structure of the cable defect location system provided by the embodiment of the present disclosure. Figure 1The cable defect location system includes: a DC high-voltage generating module, an arc detection module, a key switch, a control switch, a low-frequency signal generating module, a low-frequency signal detection module and a main control module; the first end of the key switch is used to connect to the power supply, and the second end of the key switch is respectively connected to the power supply ends of the DC high-voltage generating module and the arc detection module; the DC high-voltage generating module, the arc detection module, the low-frequency signal generating module and the low-frequency signal detection module are all connected to the main control module; the first end of the control switch is connected to the second end of the key switch, the second end of the control switch is connected to the power supply end of the low-frequency signal detection module, and the control end of the control switch is connected to the main control module; the DC high-voltage generating module is configured to inject a high-voltage DC signal into the cable under test, the arc detection module is configured to detect the arc generated by the cable under test, the low-frequency signal generating module is configured to inject a low-frequency signal into the cable under test, and the low-frequency signal detection module is configured to detect the reflected low-frequency signal.

[0034] In this embodiment, the first end of the push button switch is connected to a power source, and the second end is connected to the power supply terminals of the DC high-voltage generating module and the arc detection module, respectively, to ensure the normal operation of these two modules. Pressing the push button switch triggers the DC high-voltage generating module and the arc detection module to enter the operating state.

[0035] The DC high-voltage generator module injects a high-voltage DC signal into the cable under test. This signal gradually increases until a stable arc forms between the cable and ground. The arc detection module is configured to detect arcs generated by the cable under test. When the DC high-voltage generator module injects a high-voltage DC signal into the cable, an arc will form if the cable is defective. The arc detection module detects the arc current. When the arc current stabilizes, the main control module sends a control command to the control switch, controlling the operation and connecting the power supply to the power supply terminal of the low-frequency signal generator module, thereby activating the low-frequency signal generator module.

[0036] The low-frequency signal generation module is configured to inject a low-frequency signal into the cable under test. After the arc detection module detects that the arc current has stabilized, the low-frequency signal generation module, in response to instructions from the main control module, injects the low-frequency signal into the line. When the low-frequency signal is injected into the cable under test, a reflected signal is generated at the fault point in the cable (where the load impedance does not match the characteristic impedance). The low-frequency signal detection module collects the reflected low-frequency signal and transmits the detection results to the main control module.

[0037] The main control module sends control commands to the DC high-voltage generator module, the low-frequency signal generator module, and the control switch, while also receiving detection results from the arc detection module and the low-frequency signal detection module. Based on the feedback from the arc detection module, the main control module determines whether the arc current is stable. Once the arc current is stable, it sends a control command to the control switch. Once the low-frequency signal generator module enters operation, it controls the module to inject a low-frequency signal into the cable and starts timing. Simultaneously, the main control module receives the reflected signal from the low-frequency signal detection module and calculates the distance to the fault point based on the time difference between the reflected signals.

[0038] From the above, it can be concluded that this embodiment injects a high-voltage DC signal into the cable under test through the DC high-voltage generation module, and cooperates with the arc detection module to accurately detect the arc generated by the cable, thereby quickly discovering potential defects in the cable. The low-frequency signal generation module and the low-frequency signal detection module work together to accurately locate the cable fault point. Compared with traditional detection methods, this embodiment does not require manual inspections and offline testing, shortens the detection cycle, and improves detection efficiency and accuracy. It can detect cable defects in a timely manner, avoid serious accidents such as single-phase grounding caused by cable problems and then turning into phase-to-phase short circuits, and ensure the stable operation of the power supply system and the safety of people and property.

[0039] like Figure 2 As shown, in one embodiment of the present disclosure, a DC high voltage generating module includes: a capacitor C2, a first discharge tube U1, a second discharge tube U2, a first transformer T1, a second transformer T2, a switch tube Q1, a resistor R1 and a capacitor C3; a first end of the capacitor C2 is used to connect to the positive electrode of an external DC power supply, a second end of the capacitor C2 is used to connect to the negative electrode of the external DC power supply, a first input end of the transformer T1 is connected to the first end of the capacitor C2, a second input end of the first transformer T1 is connected to the first end of the second discharge tube U2 through the first discharge tube U1, and a second end of the second discharge tube U2 is connected to the second end of the capacitor C2. Two terminals; the first output terminal of the transformer T1 is connected to the first terminal of the resistor R1, the second terminal of the resistor R1 is grounded through the capacitor C3, the second terminal of the resistor R1 is used to output a high-voltage DC signal, and the second output terminal of the transformer T1 is grounded; the first input terminal of the transformer T2 is connected to the second input terminal of the first transformer T1, the second input terminal of the transformer T2 is connected to the first terminal of the second discharge tube U2, the first output terminal of the transformer T2 is connected to the second terminal of the push button switch, the second output terminal of the transformer T2 is connected to the first terminal of the switch tube Q1, the second terminal of the switch tube Q1 is grounded, and the control terminal of the switch tube Q1 is connected to the main control module.

[0040] In this embodiment, the DC high voltage generating module is used to output a high voltage DC signal. Specifically, the working principle of the DC high voltage generating module is as follows:

[0041] The main control module outputs a PWM control signal, the external DC power supply is a 300V DC voltage, and the breakdown voltages of the first discharge tube U1 and the second discharge tube U2 are both 200V.

[0042] When the PWM control signal is low, switch Q1 is turned off, and the primary voltage of transformer T2 is 0. Therefore, the secondary voltage of transformer T2 is also 0. After the external DC power supply is connected, the breakdown voltage of the first discharge tube U1 and the second discharge tube U2 in series is 400V. The first discharge tube U1 and the second discharge tube U2 cannot be broken down. Therefore, the primary voltage of transformer T1 is 0, that is, the output of the DC high-voltage generating module is 0. When the PWM control signal is high, switch Q1 is turned on, and the primary of transformer T2 generates 24V. Transformer T2 is a step-up transformer. After the voltage is stepped up, the secondary voltage of transformer T2 is greater than 200V, and the first discharge tube U1 is broken down and turned on. At this time, the external DC power supply is greater than the breakdown voltage of the second discharge tube U2. The second discharge tube U2 is also broken down, and the primary of transformer T1 generates a voltage. Transformer T1 is also a step-up transformer. After the voltage is stepped up, a high-voltage signal is generated from the first output terminal of transformer T1. Resistor R1 and capacitor C3 form a filter circuit to ensure that the generated DC high-voltage signal is more stable. That is, under the action of the PWM control signal output by the main control module, the DC high voltage generating module generates a DC high voltage signal.

[0043] From the above, it can be concluded that this embodiment intelligently regulates the working states of the switch tube and the discharge tube through the PWM control signal output by the main control module, uses a step-up transformer to increase the voltage, and combines the filter circuit to stably output a high-voltage DC signal, effectively ensuring the stable supply and precise control of the high-voltage signal in the cable defect detection system, and improving the overall performance and reliability of the detection system.

[0044] like Figure 2 As shown, in one embodiment of the present disclosure, the DC high-voltage generating module further includes: a switch tube Q2, a resistor R2, a switch tube Q3 and a variable resistor RP1; the first end of the switch tube Q2 is connected to the second end of the resistor R1, the second end of the switch tube Q2 is used to output a high-voltage DC signal, the control end of the switch tube Q2 is connected to the first end of the switch tube Q3 through the resistor R2, the second end of the switch tube Q3 is grounded, the control end of the switch tube Q3 is connected to the sliding end of the variable resistor RP1, the first end of the variable resistor RP1 is connected to the second end of the switch tube Q2, and the second end of the variable resistor RP1 is grounded.

[0045] In this embodiment, the switch tube Q2 and the switch tube Q3 can be triodes, the control ends of the switch tube Q2 and the switch tube Q3 serve as the base of the triode, the first ends of the switch tube Q2 and the switch tube Q3 serve as the collector of the triode, and the second ends of the switch tube Q2 and the switch tube Q3 serve as the emitter of the triode.

[0046] Switch Q2, resistor R2, switch Q3, and variable resistor RP1 form a voltage stabilization circuit. When the output high-voltage DC signal fluctuates, the voltage at the slider terminal of variable resistor RP1 changes accordingly. Because the slider terminal of variable resistor RP1 is connected to the control terminal (base) of switch Q3, changes in the slider voltage of variable resistor RP1 can alter the conduction level of switch Q3. The first terminal (collector) of switch Q3 is connected to the control terminal (base) of switch Q2 via resistor R2. Therefore, changes in the conduction level of switch Q3 affect the conduction level of switch Q2 through resistor R2. The first terminal (collector) of switch Q2 is connected to the second terminal of resistor R1, and the second terminal (emitter) is used to output the high-voltage DC signal. This feedback regulation mechanism dynamically adjusts the conduction state of switch Q2 based on changes in the output high-voltage DC signal, thereby stabilizing the output high-voltage DC signal and ensuring the high stability and reliability of the high-voltage DC signal output by the DC high-voltage generator module.

[0047] As can be seen from the above, this embodiment achieves precise control of the output high-voltage DC signal. When the output signal fluctuates, the change in the voltage at the sliding terminal of the variable resistor RP1 provides real-time feedback and adjusts the conduction level of the switch Q3, which in turn affects the conduction state of the switch Q2 through the resistor R2. This feedback regulation mechanism ensures stable output of the high-voltage DC signal, effectively improving the performance of the DC high-voltage generator module and providing a more reliable high-voltage signal source for applications such as cable defect detection.

[0048] like Figure 3 As shown, in one embodiment of the present disclosure, the arc detection module includes: a detection coil U5, a resistor R5, a resistor R6, a resistor R7 and an operational amplifier U3; the first end of the detection coil U5 is connected to the inverting input end of the operational amplifier U3 through the resistor R5, the second end of the detection coil U5 is grounded, the non-inverting input end of the operational amplifier U3 is grounded through the resistor R7, the output end of the operational amplifier U3 is connected to the inverting input end of the operational amplifier U3 through the resistor R6, and the output end of the operational amplifier U3 is connected to the main control module.

[0049] In this embodiment, detection coil U5 is used to detect arcs generated by the cable under test. When a cable defect creates an arc, a changing magnetic field is generated in the surrounding space. Detection coil U5 senses this changing magnetic field and generates an induced current. This induced current flows through resistor R5 into the inverting input of op amp U3. The non-inverting input of op amp U3 is grounded via resistor R7, setting a reference potential. Op amp U3 acts as an amplifier and buffer. Since the output of op amp U3 is connected to the inverting input of op amp U3 via resistor R6, a negative feedback circuit is formed. This negative feedback circuit stabilizes the operating state of the op amp and adjusts the amplification factor based on the magnitude of the input signal. When detection coil U5 detects the magnetic field changes generated by the arc and converts them into an electrical signal, which is input to op amp U3. Op amp U3 amplifies this signal and outputs the amplified signal from its output. The output of op amp U3 is connected to the main control module, which transmits the detected arc signal to the main control module. The main control module uses this signal to determine whether an arc exists in the cable and the arc's condition, thereby further controlling the operation of the entire cable defect detection system.

[0050] like Figure 3 As shown, in one embodiment of the present disclosure, the arc detection module further includes: an operational amplifier U4, a resistor R9 and a capacitor C8; the non-inverting input terminal of the operational amplifier U4 is connected to the output terminal of the operational amplifier U3, the output terminal of the operational amplifier U4 is connected to the inverting input terminal of the operational amplifier U4, the output terminal of the operational amplifier U4 is connected to the first terminal of the resistor R9, the second terminal of the resistor R9 is grounded through the capacitor C8, and the second terminal of the resistor R9 is connected to the main control module.

[0051] In this embodiment, the amplified arc detection signal output by op amp U3 enters op amp U4. The non-inverting input of op amp U4 is connected to the output of op amp U3, while the output of op amp U4 is connected to the inverting input of op amp U4, forming a voltage follower structure. A voltage follower, with its high input impedance and low output impedance, provides isolation and buffering, preventing downstream circuits from affecting the output of op amp U3. This also results in a more stable output signal from op amp U4.

[0052] Resistor R9 and capacitor C8 form a low-pass filter. The signal output by op amp U4 is filtered by resistor R9 and capacitor C8, removing high-frequency noise and interference. This ensures a purer and more accurate arc detection signal output to the main control module. The processed arc detection signal is then output from the second end of resistor R9 and connected to the main control module. Based on this signal, the main control module determines the arc status of the cable, enabling precise control of the cable defect detection system.

[0053] like Figure 1 As shown, in one embodiment of the present disclosure, it also includes: an alarm module; the alarm module is connected to the main control module.

[0054] In this embodiment, the alarm module is connected to the main control module. The main control module continuously receives detection results from the arc detection module and the low-frequency signal detection module throughout the cable defect detection process. If the main control module determines based on these detection results that a serious cable defect exists or that the detection system is experiencing an abnormality, it can send a trigger signal to the alarm module.

[0055] Upon receiving the trigger signal, the alarm module activates the alarm function. This can be accomplished by using an audible or visual alarm, for example, by emitting a loud sound and flashing lights to attract the operator's attention. This allows the operator to promptly detect abnormalities in the cable defect detection system or serious cable problems, allowing them to take appropriate action, such as suspending testing, repairing the cable, or conducting further inspections.

[0056] like Figure 1 As shown, in one embodiment of the present disclosure, it also includes: a wireless communication module; the main control module is communicatively connected to the monitoring platform via the wireless communication module.

[0057] In this embodiment, the wireless communication module connects the main control module and the monitoring platform in the cable defect detection system. While the main control module controls the entire detection system and receives the detection results of each module, it also transmits relevant information to the monitoring platform in real time through the wireless communication module.

[0058] When the detection system is operating, the main control module organizes and encodes data such as the operating status of the DC high-voltage generator module, arc detection information from the arc detection module, signal injection from the low-frequency signal generator module, and reflected signals from the low-frequency signal detection module. This data is then transmitted as wireless signals via the wireless communication module. The wireless communication module can utilize Bluetooth, Wi-Fi, ZigBee, or mobile network communication technologies to ensure stable and reliable signal transmission. Monitoring personnel can send instructions to the main control module through the monitoring platform to further adjust detection system parameters or take appropriate measures.

[0059] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present disclosure.

Claims

1. Cable defect location system, characterized in that: include: DC high voltage generation module, arc detection module, key switch, control switch, low frequency signal generation module, low frequency signal detection module and main control module; The first end of the key switch is used to connect to a power supply, and the second end of the key switch is connected to the power supply ends of the DC high voltage generating module and the arc detection module respectively; The DC high voltage generating module, the arc detecting module, the low frequency signal generating module and the low frequency signal detecting module are all connected to the main control module; The first end of the control switch is connected to the second end of the key switch, the second end of the control switch is connected to the power supply end of the low-frequency signal detection module, and the control end of the control switch is connected to the main control module; The DC high-voltage generating module is configured to inject a high-voltage DC signal into the cable under test, the arc detection module is configured to detect the arc generated by the cable under test, the low-frequency signal generating module is configured to inject a low-frequency signal into the cable under test, and the low-frequency signal detection module is configured to detect the reflected low-frequency signal.

2. The cable defect location system according to claim 1, characterized in that: The DC high voltage generating module includes: a capacitor C2, a first discharge tube U1, a second discharge tube U2, a first transformer T1, a second transformer T2, a switch tube Q1, a resistor R1 and a capacitor C3; The first end of the capacitor C2 is used to connect to the positive electrode of the external DC power supply, and the second end of the capacitor C2 is used to connect to the negative electrode of the external DC power supply. The first input end of the transformer T1 is connected to the first end of the capacitor C2. The second input end of the first transformer T1 is connected to the first end of the second discharge tube U2 through the first discharge tube U1. The second end of the second discharge tube U2 is connected to the second end of the capacitor C2. The first output end of the transformer T1 is connected to the first end of the resistor R1, the second end of the resistor R1 is grounded via the capacitor C3, the second end of the resistor R1 is used to output a high-voltage DC signal, and the second output end of the transformer T1 is grounded; The first input end of the transformer T2 is connected to the second input end of the first transformer T1, the second input end of the transformer T2 is connected to the first end of the second discharge tube U2, the first output end of the transformer T2 is connected to the second end of the key switch, the second output end of the transformer T2 is connected to the first end of the switch tube Q1, the second end of the switch tube Q1 is grounded, and the control end of the switch tube Q1 is connected to the main control module.

3. The cable defect location system according to claim 2, wherein: The DC high voltage generating module further includes: a switch tube Q2, a resistor R2, a switch tube Q3 and a variable resistor RP1; The first end of the switch tube Q2 is connected to the second end of the resistor R1, and the second end of the switch tube Q2 is used to output a high-voltage DC signal. The control end of the switch tube Q2 is connected to the first end of the switch tube Q3 through the resistor R2, and the second end of the switch tube Q3 is grounded. The control end of the switch tube Q3 is connected to the sliding end of the resistor RP1, the first end of the resistor RP1 is connected to the second end of the switch tube Q2, and the second end of the resistor RP1 is grounded.

4. The cable defect location system according to claim 1, wherein: The arc detection module includes: a detection coil U5, a resistor R5, a resistor R6, a resistor R7 and an operational amplifier U3; The first end of the detection coil U5 is connected to the inverting input end of the operational amplifier U3 through the resistor R5, the second end of the detection coil U5 is grounded, the non-inverting input end of the operational amplifier U3 is grounded through the resistor R7, the output end of the operational amplifier U3 is connected to the inverting input end of the operational amplifier U3 through the resistor R6, and the output end of the operational amplifier U3 is connected to the main control module.

5. The cable defect location system according to claim 4, characterized in that: The arc detection module also includes: an operational amplifier U4, a resistor R9 and a capacitor C8; The non-inverting input terminal of the operational amplifier U4 is connected to the output terminal of the operational amplifier U3, the output terminal of the operational amplifier U4 is connected to the inverting input terminal of the operational amplifier U4, the output terminal of the operational amplifier U4 is connected to the first end of the resistor R9, the second end of the resistor R9 is grounded through the capacitor C8, and the second end of the resistor R9 is connected to the main control module.

6. The cable defect location system according to claim 1, wherein: Also includes: Alarm module; The alarm module is connected to the main control module.

7. The cable defect location system according to claim 1, wherein: Also includes: Wireless communication module; The main control module is connected to the monitoring platform through the wireless communication module.

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