Cable fault intelligent monitoring system

Abstract

The utility model provides a cable fault intelligent monitoring system, and belongs to the technical field of cable insulation monitoring. The cable fault intelligent monitoring system comprises a power supply management module, an injection power supply generation module, a voltage acquisition module, a current acquisition module, a temperature detection module, an electromagnetic detection module, a first comparator, a second comparator or module, a selection switch module, a first signal enhancement module, a second signal enhancement module, a signal processing module and a control module. A display module; the power management module is connected with the injection power generation module and the control module. The injection power supply generation module, the voltage acquisition module, the current acquisition module, the electromagnetic detection module and the temperature detection module are connected with a cable; the control module is connected with the signal processing module, the injection power supply generation module and the display module. According to the invention, the problem that the cable insulation monitoring technology lacks real-time performance can be solved, and the timeliness of finding cable faults is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of cable insulation monitoring, and in particular to an intelligent cable fault monitoring system. Background Art

[0002] Cable insulation performance is crucial in power supply systems. Existing cable insulation monitoring for low-current systems relies on periodic power outages for maintenance. Megohmmeters and other tools are used to measure the line ground resistance after power outages, disrupting production and consuming a lot of work. This makes it difficult to detect faults during operation. Consequently, existing cable insulation monitoring technologies lack real-time performance and are unable to detect cable faults promptly. Utility Model Content

[0003] The embodiments of the present disclosure provide an intelligent cable fault monitoring system to solve the problem that cable insulation monitoring technology lacks real-time performance and improve the timeliness of discovering cable faults.

[0004] The present disclosure provides an intelligent cable fault monitoring system, comprising:

[0005] Power management module, injection power generation module, voltage acquisition module, current acquisition module, temperature detection module, electromagnetic detection module, first comparator, second comparator, OR module, selection switch module, first signal enhancement module, second signal enhancement module, signal processing module, control module, display module;

[0006] The power management module is connected to the injection power generation module and the control module respectively;

[0007] The injection power generation module, the voltage acquisition module, the current acquisition module, the electromagnetic detection module and the temperature detection module are all used to connect with the cable;

[0008] The voltage acquisition module and the current acquisition module are both connected to the selection switch module;

[0009] The temperature detection module is connected to the non-inverting input terminal of the first comparator;

[0010] The inverting input terminal of the first comparator is used to receive the temperature reference value, and the output terminal is connected to the OR module;

[0011] The electromagnetic detection module is connected to the non-inverting input terminal of the second comparator;

[0012] The inverting input terminal of the second comparator is used to receive the electromagnetic reference value, and the output terminal is connected to the OR module;

[0013] The selection switch module is respectively connected to the OR module, the first signal enhancement module, the second signal enhancement module and the signal processing module;

[0014] The control module is connected to the signal processing module, the injection power generation module and the display module respectively;

[0015] The injection power generation module is configured to inject a variable frequency signal into the cable.

[0016] In an exemplary embodiment of the present disclosure, the selection switch module includes a first single-pole double-throw switch and a second single-pole double-throw switch;

[0017] The fixed end of the first single-pole double-throw switch is connected to the voltage acquisition module, the first movable end is connected to the first signal enhancement module, and the second movable end is connected to the signal processing module;

[0018] The fixed end of the second single-pole double-throw switch is connected to the current acquisition module, the first movable end is connected to the second signal enhancement module, and the second movable end is connected to the signal processing module.

[0019] In an exemplary embodiment of the present disclosure, the signal processing module includes a first signal processing unit and a second signal processing unit;

[0020] The first signal processing unit is respectively connected to the first signal enhancement module, the second movable end of the first single-pole double-throw switch and the control module;

[0021] The second signal processing unit is connected to the second signal enhancement module, the second moving end of the second single-pole double-throw switch and the control module respectively.

[0022] In an exemplary embodiment of the present disclosure, the first signal processing unit includes a voltage amplification unit, a drive amplification unit, and a high-voltage isolation unit;

[0023] The voltage amplification unit is respectively connected to the second moving end of the first single-pole double-throw switch, the first signal enhancement module and the drive amplification unit;

[0024] The driving amplification unit is connected to the high-voltage isolation unit;

[0025] The high voltage isolation unit is connected to the control module.

[0026] In an exemplary embodiment of the present disclosure, the second signal processing unit includes a notch filtering unit, a signal amplifying unit, a modulation and demodulation unit, and a low-pass filtering unit;

[0027] The notch filter unit is respectively connected to the second moving end of the second single-pole double-throw switch, the second signal enhancement module and the signal amplification unit;

[0028] The modulation and demodulation unit is connected to the signal amplification unit and the low-pass filtering unit respectively;

[0029] The low-pass filter unit is connected to the control module.

[0030] In an exemplary embodiment of the present disclosure, the current acquisition module includes a Rogowski coil;

[0031] Rogowski coils are used in connection with cables.

[0032] In an exemplary embodiment of the present disclosure, the intelligent cable fault monitoring system further includes a power supply monitoring module;

[0033] The power monitoring module is connected to the control module.

[0034] In an exemplary embodiment of the present disclosure, the intelligent cable fault monitoring system further includes a fault detection module;

[0035] The fault detection module is connected to the control module.

[0036] The beneficial effects of the intelligent cable fault monitoring system provided by the embodiments of the present disclosure are:

[0037] The disclosed embodiment achieves comprehensive, real-time monitoring of the cable insulation status, greatly improving the safety and reliability of cable operation. The disclosed embodiment adopts variable frequency signal injection technology, which can more accurately evaluate the cable insulation performance, promptly detect potential faults, and avoid power accidents caused by insulation aging or damage. Finally, the coordinated operation of the control module and the display module makes the system easy and intuitive to operate, making it convenient for operation and maintenance personnel to promptly grasp the cable insulation status and perform necessary maintenance and inspections. Therefore, the disclosed embodiment can solve the problem of the lack of real-time performance of cable insulation monitoring technology and can promptly detect cable faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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.

[0039] Figure 1 This is a structural diagram of a cable fault intelligent monitoring system provided by an embodiment of the present disclosure;

[0040] Figure 2 is a structural diagram of another cable fault intelligent monitoring system provided by an embodiment of the present disclosure;

[0041] Figure 3 This is a structural diagram of another cable fault intelligent monitoring system provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] The following describes the implementation of the present disclosure in detail with reference to the accompanying drawings:

[0045] Figure 1 This is a schematic diagram of the structure of a cable fault intelligent monitoring system provided by an embodiment of the present disclosure. Figure 1 , the cable fault intelligent monitoring system includes:

[0046] Power management module 101, injection power generation module 102, voltage acquisition module 103, current acquisition module 104, temperature detection module 105, electromagnetic detection module 106, first comparator 107, second comparator 108, or module 109, selection switch module 110, first signal enhancement module 111, second signal enhancement module 112, signal processing module 113, control module 114, display module 115;

[0047] The power management module 101 is connected to the injection power generation module 102 and the control module 114 respectively;

[0048] The injection power generation module 102, the voltage acquisition module 103, the current acquisition module 104, the electromagnetic detection module 106 and the temperature detection module 105 are all used to connect to the cable 10;

[0049] The voltage acquisition module 103 and the current acquisition module 104 are both connected to the selection switch module 110;

[0050] The temperature detection module 105 is connected to the non-inverting input terminal of the first comparator 107;

[0051] The inverting input terminal of the first comparator 107 is used to receive the temperature reference value, and the output terminal is connected to the OR module 109;

[0052] The electromagnetic detection module 106 is connected to the non-inverting input terminal of the second comparator 108;

[0053] The inverting input terminal of the second comparator 108 is used to receive the electromagnetic reference value, and the output terminal is connected to the OR module 109;

[0054] The selection switch module 110 is respectively connected to the OR module 109, the first signal enhancement module 111, the second signal enhancement module 112 and the signal processing module 113;

[0055] The control module 114 is connected to the signal processing module 113, the injection power generation module 102 and the display module 115 respectively;

[0056] The injection power generation module 102 is configured to inject a variable frequency signal into the cable 10 .

[0057] In this embodiment, the power management module 101 can provide a stable power supply to the injection power generation module 102 and the control module 114 , and can also manage and regulate the input power.

[0058] The injection power generation module 102 is configured to inject a variable-frequency signal into the cable 10. By injecting signals of varying frequencies, this embodiment can test the insulation characteristics of the cable 10 at different frequencies. Furthermore, injecting variable-frequency signals helps provide a more comprehensive understanding of the insulation status of the cable 10 and identify potential problems. The injection power generation module 102 is connected to the power management module 101 and the control module 114, receiving power supply and control signals to adjust the frequency and amplitude of the injection signal.

[0059] The voltage acquisition module 103 is configured to acquire the voltage signal of the cable 10 , and the current acquisition module 104 is configured to acquire the current signal of the cable 10 . The voltage signal and the current signal can reflect the operating status and insulation performance of the cable 10 .

[0060] The temperature detection module 105 is configured to detect the temperature of the cable 10 in real time, is connected to the non-inverting input terminal of the first comparator 107, and compares the detected temperature signal with the temperature reference value in the first comparator 107. The electromagnetic detection module 106 is configured to detect the electromagnetic signal around the cable 10, is connected to the non-inverting input terminal of the second comparator 108, and compares the detected electromagnetic signal with the electromagnetic reference value in the second comparator 108.

[0061] First comparator 107 is used to compare the temperature signal output by temperature detection module 105 with a temperature reference value. Second comparator 108 is used to compare the electromagnetic signal output by electromagnetic detection module 106 with an electromagnetic reference value. OR module 109 receives the output signals from first comparator 107 and second comparator 108. Selector switch module 110 selects whether to perform signal enhancement based on the output signal from OR module 109.

[0062] For example, when the temperature exceeds the reference value, the first comparator 107 outputs a signal "1" to the OR module 109; when the electromagnetic exceeds the reference value, the second comparator 108 outputs a signal "1" to the OR module 109. At this time, the signal of the OR module 109 is "11", and the OR module 109 controls the selection switch module 110 to connect the first signal enhancement module 111 and the second signal enhancement module 112 respectively; when the temperature exceeds the reference value, the first comparator 107 outputs a signal "1" to the OR module 109; when the electromagnetic does not exceed the reference value, the second comparator 108 outputs a signal "0" to the OR module 109. At this time, the signal of the OR module 109 is "10", and the OR module 109 controls the selection switch module 110 to connect the first signal enhancement module 111 and the second signal enhancement module 112 respectively. Signal enhancement module 112; when the temperature does not exceed the reference value, the first comparator 107 outputs a signal "0" to the OR module 109, and when the electromagnetic exceeds the reference value, the second comparator 108 outputs a signal "1" to the OR module 109. At this time, the signal of the OR module 109 is "01", and the OR module 109 controls the selection switch module 110 to connect the first signal enhancement module 111 and the second signal enhancement module 112 respectively; when the temperature does not exceed the reference value, the first comparator 107 outputs a signal "0" to the OR module 109, and when the electromagnetic does not exceed the reference value, the second comparator 108 outputs a signal "0" to the OR module 109. At this time, the signal of the OR module 109 is "00", and the OR module 109 controls the selection switch module 110 to connect to the signal processing module 113.

[0063] The signal processing module 113 processes and analyzes the signal from the selector switch module 110, employing various signal processing algorithms to extract useful information and determine the insulation status of the cable 10. The signal processing module 113 is connected to the control module 114 and transmits the processed results to the control module 114 for display and control decision making.

[0064] Control module 114 receives the processing results from signal processing module 113 and controls the operating parameters of injection power generation module 102 based on the results, such as adjusting the frequency and amplitude of the injection signal. It also controls display module 115 to display insulation status information of cable 10 to the user. Control module 114 may be based on an STM32F407 processor.

[0065] Exemplarily, control module 114 controls the output signal type of the signal generator. The DSP module in the chip performs a Fourier transform on the acquired time-varying signal to obtain the signal's spectrum. Kalman filtering is then performed on the current response signal obtained by the filter circuit to obtain accurate capacitive and resistive currents. By varying the signal frequency, different capacitive and resistive currents are obtained. A multivariate equation system is established and solved to obtain the resistance and capacitance values ​​of each phase line to ground, thereby obtaining accurate insulation data.

[0066] Display module 115 is used to display insulation status information of cable 10, such as temperature, electromagnetic field, voltage, current, and other parameters. The user can intuitively understand the operating status of cable 10 through display module 115. Display module 115 is connected to control module 114, receives instructions from control module 114, and displays corresponding information.

[0067] From the above, it can be concluded that this embodiment achieves comprehensive, real-time monitoring of the insulation status of the cable 10, greatly improving the safety and reliability of the operation of the cable 10. This embodiment uses variable frequency signal injection technology to more accurately evaluate the insulation performance of the cable 10, promptly detect potential faults, and avoid power accidents caused by insulation aging or damage. Finally, the coordinated operation of the control module 114 and the display module 115 makes the system easy and intuitive to operate, making it convenient for operation and maintenance personnel to promptly understand the insulation status of the cable 10 and perform necessary maintenance and inspections. Therefore, this embodiment can solve the problem of the lack of real-time performance of the cable 10 insulation monitoring technology and can promptly detect faults in the cable 10.

[0068] In one embodiment of the present disclosure, reference Figure 2 , the selection switch module 110 includes a first single-pole double-throw switch 201 and a second single-pole double-throw switch 202;

[0069] The fixed end of the first single-pole double-throw switch 201 is connected to the voltage acquisition module 103, the first movable end is connected to the first signal enhancement module 111, and the second movable end is connected to the signal processing module 113;

[0070] The fixed end of the second single-pole double-throw switch 202 is connected to the current acquisition module 104 , the first movable end is connected to the second signal enhancement module 112 , and the second movable end is connected to the signal processing module 113 .

[0071] In this embodiment, the selector switch module 110 comprises a first single-pole double-throw switch 201 and a second single-pole double-throw switch 202. The fixed terminal of the first single-pole double-throw switch 201 is connected to the voltage acquisition module 103, and the voltage signal collected by the voltage acquisition module 103 enters the first single-pole double-throw switch 201. When the first movable terminal of the first single-pole double-throw switch 201 is connected to the first signal enhancement module 111, the voltage signal is transmitted to the first signal enhancement module 111 for signal enhancement processing. When the second movable terminal of the first single-pole double-throw switch 201 is connected to the signal processing module 113, the voltage signal is directly transmitted to the signal processing module 113 for processing and analysis.

[0072] The fixed terminal of the second SPDT switch 202 is connected to the current acquisition module 104, and the current signal collected by the current acquisition module 104 enters the second SPDT switch 202. When the first movable terminal of the second SPDT switch 202 is connected to the second signal enhancement module 112, the current signal can be transmitted to the second signal enhancement module 112 for enhancement processing. When the second movable terminal of the second SPDT switch 202 is connected to the signal processing module 113, the current signal can be directly transmitted to the signal processing module 113.

[0073] It can be concluded from the above that this embodiment can select whether to enhance the signal according to actual conditions, thereby improving the adaptability of the system and facilitating obtaining more accurate insulation status monitoring results.

[0074] In one embodiment of the present disclosure, reference Figure 2 , the signal processing module 113 includes a first signal processing unit 301 and a second signal processing unit 302;

[0075] The first signal processing unit 301 is connected to the first signal enhancement module 111, the second active end of the first single-pole double-throw switch 201 and the control module 114 respectively;

[0076] The second signal processing unit 302 is connected to the second signal enhancement module 112 , the second active terminal of the second single-pole double-throw switch 202 , and the control module 114 , respectively.

[0077] In one embodiment of the present disclosure, reference Figure 3 , the first signal processing unit 301 includes a voltage amplifying unit 311, a driving amplifying unit 312 and a high voltage isolation unit 313;

[0078] The voltage amplifying unit 311 is connected to the second moving end of the first single-pole double-throw switch 201, the first signal enhancing module 111 and the driving amplifying unit 312 respectively;

[0079] The driving amplifying unit 312 is connected to the high voltage isolation unit 313;

[0080] The high-voltage isolation unit 313 is connected to the control module 114 .

[0081] In one embodiment of the present disclosure, reference Figure 3 , the second signal processing unit 302 includes a notch filter unit 321, a signal amplification unit 322, a modulation and demodulation unit 323 and a low-pass filter unit 324;

[0082] The notch filter unit 321 is connected to the second moving end of the second single-pole double-throw switch 202, the second signal enhancement module 112 and the signal amplification unit 322 respectively;

[0083] The modulation and demodulation unit 323 is connected to the signal amplification unit 322 and the low-pass filtering unit 324 respectively;

[0084] The low-pass filter unit 324 is connected to the control module 114 .

[0085] In this embodiment, the signal processing module 113 is divided into a first signal processing unit 301 and a second signal processing unit 302 , which process the signals from the voltage acquisition module 103 and the current acquisition module 104 respectively, and transmit the processing results to the control module 114 .

[0086] When the first single-pole double-throw switch 201 is switched to the second active end, the voltage signal can directly enter the first signal processing unit 301 , or enter the first signal processing unit 301 after being enhanced by the first signal enhancement module 111 .

[0087] The first signal processing unit 301 processes the voltage signal so that the control module 114 can accurately analyze the insulation status of the cable 10 .

[0088] When the second SPDT switch 202 is switched to the second active end, the current signal may directly enter the second signal processing unit 302 , or enter the second signal processing unit 302 after being enhanced by the second signal enhancement module 112 .

[0089] The second signal processing unit 302 provides the control module 114 with information about the insulation status of the cable 10 by processing the current signal.

[0090] The first signal processing unit 301 may include a voltage amplifying unit 311 , a driving amplifying unit 312 , and a high-voltage isolation unit 313 .

[0091] The voltage amplifying unit 311 is used to amplify the input voltage signal. Whether it is a voltage signal directly from the voltage acquisition module 103 or a voltage signal enhanced by the first signal enhancement module 111, it needs to be further amplified by the voltage amplifying unit 311 to improve the signal strength and resolution.

[0092] The driver amplifier unit 312 further amplifies the signal processed by the voltage amplifier unit 311 to meet the input requirements of the subsequent high-voltage isolation unit 313. At the same time, the driver amplifier unit 312 can also improve the driving capability of the voltage signal, ensuring that the voltage signal can be stably transmitted to the high-voltage isolation unit 313.

[0093] The high-voltage isolation unit 313 isolates the amplified voltage signal to protect the control module 114 and other low-voltage devices from the high-voltage signal. The high-voltage isolation unit 313 can effectively prevent the high-voltage signal from damaging other parts of the system, thereby improving the safety and reliability of the system.

[0094] Exemplarily, because some signals are mixed-frequency signals, the D / A function of the microprocessor (i.e., control module 114) is used to generate signals, which are then injected into the high-voltage isolation unit 313 via the voltage amplification unit 311 and the drive amplification unit 312. This embodiment, based on instructions from the data processing circuit, generates low-frequency signals in the 0.1-20 Hz frequency range, high-frequency signals in the 2K-30KHz range, and mixed-frequency signals stored in the processing circuit. The response characteristics of the circuit at different frequencies are then derived and injected into the circuit via the high-voltage isolation unit 313, which also absorbs the signals coupled from the circuit.

[0095] The second signal processing unit 302 may include a notch filtering unit 321 , a signal amplifying unit 322 , a modulation and demodulation unit 323 , and a low-pass filtering unit 324 .

[0096] The notch filter unit 321 performs notch filtering on the input current signal. Notch filtering can remove interference signals of specific frequencies, improving the quality and purity of the current signal. For example, this embodiment can remove interference signals of the power supply frequency to better analyze the useful information in the current signal.

[0097] The signal amplification unit 322 amplifies the current signal after the notch filtering process. Signal amplification can improve the strength and resolution of the current signal so that the subsequent modulation and demodulation unit 323 can better process the current signal.

[0098] The modulation and demodulation unit 323 modulates and demodulates the amplified current signal. Modulation and demodulation can convert the current signal into a form more suitable for transmission and processing, while also removing noise and interference from the signal. For example, this embodiment can use digital modulation and demodulation technology to convert the current signal into a digital signal for processing.

[0099] The low-pass filter unit 324 performs low-pass filtering on the modulated and demodulated signal. Low-pass filtering can remove high-frequency noise and interference while retaining low-frequency components in the signal, helping to improve signal stability and reliability and enabling the control module 114 to more accurately analyze the insulation status of the cable 10.

[0100] As can be seen from the above, this embodiment can more efficiently analyze the insulation data of the cable 10, improve monitoring accuracy and response speed, and ensure the stability and security of signal processing. At the same time, this embodiment effectively filters out interference signals and improves signal quality.

[0101] In one embodiment of the present disclosure, reference Figure 3 , the current acquisition module 104 includes a Rogowski coil;

[0102] The Rogowski coil is used to be connected to the cable 10 .

[0103] In this embodiment, the Rogowski coil is a hollow, toroidal coil typically wound with enameled wire. When current flows through the cable 10, a magnetic field is generated around it. The Rogowski coil surrounds the cable 10. Based on the principle of electromagnetic induction, a voltage signal proportional to the measured current is induced in the coil. This voltage signal is subsequently processed and amplified to determine the magnitude of the measured current.

[0104] For example, after the current signal in the conductor is obtained using a Rogowski coil in this embodiment, it is first converted into a voltage signal, and then passes through a notch filter unit 321 to remove the power frequency current signal and the high-frequency interference signal in the current signal. Then, the signal is amplified by a signal amplification unit 322. The amplified signal is processed by a modulation and demodulation unit 323 and a low-pass filter unit 324 to extract a current response with the same frequency as the generated signal. At this time, the current response includes the capacitive and resistive currents of the three-phase line to the ground.

[0105] It can be concluded from the above that the Rogowski coil can accurately measure the current. At the same time, due to the fast response speed of the Rogowski coil, the current change in the cable 10 can be monitored in real time, and abnormal current conditions can be discovered in time.

[0106] In one embodiment of the present disclosure, reference Figure 3 , the cable 10 insulation online monitoring system further includes a power supply monitoring module 116;

[0107] The power monitoring module 116 is connected to the control module 114 .

[0108] In this embodiment, the power monitoring module 116 continuously monitors the power supply provided by the power management module 101 to the entire system, and can detect parameters such as power voltage, current, and power to ensure stable and reliable power output.

[0109] The power monitoring module 116 transmits the monitored power status data to the control module 114 in real time. The control module 114 can understand the working status of the power supply based on the above data so as to effectively control and manage the entire system.

[0110] The control module 114 makes appropriate control decisions based on the information provided by the power monitoring module 116. For example, when the power supply voltage is too low, the control module 114 can adjust the system's operating parameters to reduce power consumption to ensure that the system can continue to operate normally under low voltage conditions; or, when a power supply fails, the control module 114 can activate the backup power supply to ensure uninterrupted system operation.

[0111] It can be concluded from the above that this embodiment realizes real-time monitoring of the power status by analyzing the power monitoring data, thereby ensuring the stable operation of the entire system.

[0112] In one embodiment of the present disclosure, reference Figure 2 , the cable 10 insulation online monitoring system further includes a fault detection module 117;

[0113] The fault detection module 117 is connected to the control module 114 .

[0114] In this embodiment, when there is a problem with the insulation state of the cable 10 , the fault detection module 117 will issue an alarm according to the instruction of the control module 114 .

[0115] The fault detection module 117 can use a variety of alarm methods, such as sound alarm, light alarm, SMS notification, etc., to ensure that relevant personnel can receive fault alarm information in time, and can improve the response speed to cable 10 faults and reduce potential losses.

[0116] The fault detection module 117 is connected to the control module 114 and receives the fault prompt instruction issued by the control module 114. The control module 114 determines whether the insulation state of the cable 10 is abnormal based on the analysis result of the signal processing module 113. If abnormal, it sends a fault prompt alarm signal to the fault detection module 117.

[0117] The fault detection module 117 can feed back the cable status information to the control module 114. Based on the feedback from the fault detection module 117, the control module 114 can understand whether the cable has a fault and whether the alarm mode is working properly, which helps to ensure the reliability and effectiveness of the fault detection module 117.

[0118] It can be concluded from the above that the fault detection module 117 can promptly detect and accurately issue an alarm when a problem occurs in the cable 10, and at the same time, can improve the overall safety and reliability of the system.

[0119] 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. A cable fault intelligent monitoring system, characterized in that: include: Power management module, injection power generation module, voltage acquisition module, current acquisition module, temperature detection module, electromagnetic detection module, first comparator, second comparator, OR module, selection switch module, first signal enhancement module, second signal enhancement module, signal processing module, control module, display module; The power management module is connected to the injection power generation module and the control module respectively; The injection power generation module, the voltage acquisition module, the current acquisition module, the electromagnetic detection module and the temperature detection module are all used to be connected to the cable; The voltage acquisition module and the current acquisition module are both connected to the selection switch module; The temperature detection module is connected to the non-inverting input terminal of the first comparator; The inverting input terminal of the first comparator is used to receive the temperature reference value, and the output terminal is connected to the OR module; The electromagnetic detection module is connected to the non-inverting input terminal of the second comparator; The inverting input terminal of the second comparator is used to receive the electromagnetic reference value, and the output terminal is connected to the OR module; The selection switch module is respectively connected to the OR module, the first signal enhancement module, the second signal enhancement module and the signal processing module; The control module is connected to the signal processing module, the injection power generation module and the display module respectively; The injection power generation module is configured to inject a variable frequency signal into the cable.

2. The intelligent cable fault monitoring system according to claim 1, characterized in that: The selection switch module includes a first single-pole double-throw switch and a second single-pole double-throw switch; The fixed end of the first single-pole double-throw switch is connected to the voltage acquisition module, the first movable end is connected to the first signal enhancement module, and the second movable end is connected to the signal processing module; The fixed end of the second single-pole double-throw switch is connected to the current acquisition module, the first movable end is connected to the second signal enhancement module, and the second movable end is connected to the signal processing module.

3. The intelligent cable fault monitoring system according to claim 2, characterized in that: The signal processing module includes a first signal processing unit and a second signal processing unit; The first signal processing unit is connected to the first signal enhancement module, the second moving end of the first single-pole double-throw switch and the control module respectively; The second signal processing unit is connected to the second signal enhancement module, the second moving end of the second single-pole double-throw switch and the control module respectively.

4. The intelligent cable fault monitoring system according to claim 3, characterized in that: The first signal processing unit includes a voltage amplification unit, a drive amplification unit and a high-voltage isolation unit; The voltage amplification unit is respectively connected to the second moving end of the first single-pole double-throw switch, the first signal enhancement module and the drive amplification unit; The driving amplification unit is connected to the high-voltage isolation unit; The high-voltage isolation unit is connected to the control module.

5. The intelligent cable fault monitoring system according to claim 3, characterized in that: The second signal processing unit includes a notch filter unit, a signal amplification unit, a modulation and demodulation unit and a low-pass filter unit; The notch filter unit is respectively connected to the second moving end of the second single-pole double-throw switch, the second signal enhancement module and the signal amplification unit; The modulation and demodulation unit is connected to the signal amplification unit and the low-pass filtering unit respectively; The low-pass filtering unit is connected to the control module.

6. The intelligent cable fault monitoring system according to claim 1, characterized in that: The current acquisition module includes a Rogowski coil; The Rogowski coil is used to be connected to the cable.

7. The intelligent cable fault monitoring system according to claim 1, characterized in that: Also includes a power monitoring module; The power monitoring module is connected to the control module.

8. The intelligent cable fault monitoring system according to claim 1, characterized in that: Also included is a fault detection module; The fault detection module is connected to the control module.

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