A cable circulating current monitoring system, method and device for TMR magnetic balance measurement

Abstract

The present invention relates to the technical field of power equipment status monitoring, and discloses a cable circulating current monitoring system, method, and device using TMR magnetic balance measurement. The system comprises: an improved A-phase, B-phase, and C-phase grounding cable circulating current data collector based on a TMR magnetic sensitive sensor chip, a data transmission processing unit, and a monitoring platform; the data transmission processing unit is electrically connected to the A-phase, B-phase, and C-phase grounding cable circulating current data collector and is signal-connected to the monitoring platform; the grounding cable circulating current data collector for any phase is used to collect the grounding cable circulating current data of any phase and convert it into a corresponding electrical signal; the data transmission processing unit receives the electrical signal and sends it to the monitoring platform, which is used to store the electrical signal. In an embodiment of the present invention, a TMR current sensor used in the cable circulating current monitoring system is designed based on a highly sensitive TMR magnetic sensitive sensor chip and adopts the principle of magnetodynamic balance design, thereby solving the problem of low cable circulating current measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment status monitoring, and in particular to a cable circulating current monitoring system, method and equipment using TMR magnetic balance measurement. Background Art

[0002] With the advancement of urbanization, the proportion of power cables used in power transmission and distribution systems continues to increase. The number of cable disasters caused by cable faults has also increased accordingly, necessitating online monitoring of the operating status of power cables to prevent cable failures. Cable failures are generally caused by cracking of the cable insulation, which reduces insulation resistance and increases leakage current, leading to partial discharge, increased ground loop current, and elevated temperatures. When a power cable has a defect, the grounding current in its sheath increases significantly. Monitoring the ground loop current can help determine the cable's operating status.

[0003] The circulating current sensors currently used for online monitoring of ground current are relatively large. If, on this basis, partial discharge, temperature sensors and other devices are further installed in the grounding box, it is difficult to install them due to limited space. Even if they can be installed, problems such as electromagnetic compatibility will arise due to the coexistence of multiple magnetic materials in a small space. Since partial discharge sensors usually use through-type current transformers with high-frequency magnetic cores, magnetic leakage is inevitable. Therefore, there will be electromagnetic interference between them and the circulating current sensors, affecting the measurement accuracy. At the same time, due to the excessive number of connecting wires, it is easy to introduce faults and cause inconvenience to the operation and maintenance personnel. If partial discharge, temperature sensors, etc. are installed on the cable connector, the excessive number of sensors and connecting wires can easily affect the long-term stable operation of the power. Therefore, there is a problem of low accuracy in cable circulating current measurement in the existing technology. Summary of the Invention

[0004] In view of this, the present invention provides a cable circulating current monitoring system, method and device based on TMR magnetic balance measurement to solve the problem of low cable circulating current measurement accuracy.

[0005] In the first aspect, the present invention provides a cable circulation monitoring system for TMR magnetic balance measurement, comprising: an improved A-phase, B-phase and C-phase grounding cable circulation data collector based on a TMR magnetic sensitive sensor chip, a data transmission processing unit and a monitoring platform; the data transmission processing unit is electrically connected to the A-phase, B-phase and C-phase grounding cable circulation data collector, and is signal-connected to the monitoring platform; the A-phase, B-phase or C-phase grounding cable circulation data collector is used to collect the A-phase, B-phase or C-phase grounding cable circulation data, and convert the grounding cable circulation data into a corresponding electrical signal; the data transmission processing unit is used to receive the electrical signal and send the electrical signal to the monitoring platform, and the monitoring platform is used to store the electrical signal.

[0006] In an embodiment of the present invention, based on a high-sensitivity TMR magnetic sensor chip, the TMR current sensor used in the cable circulation monitoring system, i.e., the A-phase, B-phase, and C-phase grounding cable circulation data collector, is designed using the magnetodynamic balance design principle. This achieves the purpose of improving the cable sheath circulation monitoring accuracy, thereby solving the problem of low cable circulation measurement accuracy.

[0007] In an optional embodiment, the A-phase, B-phase or C-phase grounding cable circulating current data collector improved based on the TMR magnetic sensor chip adopts a magnetic gap symmetrical open-loop structure, the number of magnetic gaps is an integer multiple of two, any two magnetic gaps constitute a signal channel, and any signal channel contains two TMR magnetic sensor chips, and the two TMR magnetic sensor chips are respectively located in two symmetrical magnetic gaps of any signal channel.

[0008] In an embodiment of the present invention, the TMR magnetic sensor chips in each channel are respectively located in symmetrical magnetic gaps. The external magnetic field interference at the magnetic gaps is the same, and the magnetic signals formed by the current to be measured are opposite. After signal differentiation, the uniform external magnetic field interference at the opening of the magnetic gap can be eliminated, and the signal can be enhanced to twice the original level, achieving the effect of eliminating external magnetic field interference and increasing the signal-to-noise ratio, further improving the measurement accuracy of the cable circulating current.

[0009] In an optional embodiment, when the number of magnetic gaps is two, the circulating current data collector for any phase-grounded cable includes: two TMR magnetic sensor chips, a first differential amplifier circuit, a second differential amplifier circuit, a third differential amplifier circuit, a first filter circuit, an amplifier circuit, a second filter circuit, an ADC circuit, an MCU, a temperature and humidity sensor, and a communication unit; the output signals of the two TMR magnetic sensor chips are respectively input into the third differential amplifier circuit through the first differential amplifier circuit and the second differential amplifier circuit; the output signal of the third differential amplifier circuit is sequentially input into the ADC circuit through the first filter circuit, the amplifier circuit, and the second filter circuit; the MCU receives the output signal of the ADC circuit and the environmental parameters collected by the temperature and humidity sensor, and sends the output signal to the communication unit; the first differential amplifier circuit, the second differential amplifier circuit, and the third differential amplifier circuit are used to amplify the signal output by the TMR magnetic sensor chip and eliminate the influence of the external magnetic field signal; the first filter circuit uses active filtering for impedance matching; the amplifier circuit is used to amplify the signal; the second filter circuit uses passive filtering to prevent frequency aliasing; the MCU is used to adjust the signal channel gain according to the environmental parameters and perform digital phase-sensitive detection processing on the output signal of the ADC circuit.

[0010] In an embodiment of the present invention, a first differential amplifier circuit and a second differential amplifier circuit respectively amplify the magnetic field signal sensed by the TMR magnetic sensor chip, and then a third differential amplifier circuit differentially amplifies the signals output by the first differential amplifier circuit and the second differential amplifier circuit, thereby eliminating the influence of external magnetic field signals. The first filter circuit and the second filter circuit can filter out-of-band noise. By rationally arranging the filter circuits between the various amplifier circuits, on the one hand, the purpose of gradually improving the signal-to-noise ratio and filtering out interference introduced by each unit circuit is achieved; on the other hand, it avoids the difficulty of eliminating noise after amplification, resulting in a reduced signal-to-noise ratio and difficulty in signal recognition. A low-noise operational amplifier is used to build the amplifier circuit, and according to actual monitoring needs, the signal to be measured is amplified to an appropriate size to meet the requirements of accuracy and dynamic measurement range. The MCU receives the signal output by the ADC circuit, adjusts the signal channel gain according to environmental parameters, and performs digital phase-sensitive detection processing on the signal output by the ADC circuit, thereby improving the signal-to-noise ratio and, in turn, the measurement accuracy of the cable circulating current.

[0011] In an optional embodiment, any phase-grounded cable circulating current data collector also includes: a power supply module and a double-pole double-throw analog switch; the power supply module is used to provide a reference voltage for the ADC circuit, and the power supply module also provides a reference voltage for multiple TMR magnetic sensor chips through the double-pole double-throw analog switch, and the double-pole double-throw analog switch is used to flip the reference voltage to assist in realizing the phase-sensitive detection function and reduce noise interference.

[0012] In the embodiment of the present invention, by adopting phase-sensitive detection when measuring a DC or ultra-low frequency signal, the purpose of improving the signal-to-noise ratio and reducing noise interference can be achieved.

[0013] In an optional embodiment, the system also includes: an acquisition box, an acquisition unit and a power supply; the A-phase, B-phase and C-phase grounding cable circulation data collectors are electrically connected to the acquisition unit through the acquisition box, the acquisition unit is electrically connected to the data transmission processing unit, the power supply supplies power to the cable circulation monitoring system for TMR magnetic balance measurement, and the acquisition box is used to reduce wiring complexity and reduce signal interference.

[0014] In the embodiment of the present invention, the data collector circuit connection lines corresponding to the three-phase cables are connected to the same physical medium through the acquisition box, thereby achieving the purpose of reducing the complexity of the connection lines and reducing signal interference.

[0015] In an optional embodiment, the acquisition unit includes: a vibration acquisition unit, an environment acquisition unit and a video acquisition unit; the vibration acquisition unit is used to detect the external damage signal of the grounding cable of phase A, phase B and phase C, and the grounding cable external damage signal is the corresponding environmental change signal after the grounding cable is damaged in the external environment; the environment acquisition unit includes: a micro-meteorological monitoring sensor and a temperature sensor, and the micro-meteorological monitoring sensor is used to detect the tunnel environment information of phase A, phase B and phase C; the video acquisition unit is used to collect video and image information.

[0016] In this embodiment of the present invention, a vibration acquisition unit, an environmental acquisition unit, and a video acquisition unit collect various environmental information, providing the necessary conditions for subsequent fault analysis. Furthermore, the vibration and environmental acquisition units can perform high-precision compensation for the TMR sensor, and the information collected by the environmental acquisition unit can more accurately cover all cable faults.

[0017] In an optional embodiment, the data transmission processing unit includes: a circulating current detection circuit, a microprocessor and a wireless communication device; the A-phase, B-phase and C-phase grounding cable circulating current data collectors are electrically connected to the circulating current detection circuit, the circulating current detection circuit is electrically connected to the microprocessor, the microprocessor is electrically connected to the wireless communication device, the circulating current detection circuit and the microprocessor are used to convert and process the electrical signals output by the A-phase, B-phase and C-phase grounding cable circulating current data collectors, and the wireless communication device is used to communicate with the monitoring platform.

[0018] In an optional embodiment, the circulating current detection circuit includes: a current sensing coil, a resistor and a voltage measurement module; the A-phase, B-phase and C-phase grounding cable circulating current data collector is electrically connected to the current sensing coil, and the current sensing coil is connected in parallel with the resistor to form a first parallel loop; the voltage measurement module is connected in parallel with the resistor to form a second parallel loop; the first parallel loop and the second parallel loop are respectively electrically connected to the microprocessor.

[0019] In the embodiment of the present invention, further processing and transmission of the collected data are achieved through the data transmission processing unit, thereby achieving the purpose of monitoring and analyzing the data.

[0020] In an optional embodiment, the monitoring platform includes: a user terminal device and a server; the server includes: a receiving module, a user management module, a monitoring data management module, a database, an early warning module and a reporting module; the receiving module is used to receive the request information of the user terminal device and the electrical signal sent by the data transmission processing unit; the user management module is used to receive the login request sent by the user terminal device, and manage user information and authorization information; the monitoring data management module is used to compare, count and manage the electrical signals sent by the data transmission processing unit; the database is used to store the electrical signals, user information, authorization information and monitoring comparison data corresponding to the grounding cable circulation data collected by the A-phase, B-phase and C-phase grounding cable circulation data collector; the early warning module is used to send early warning information to the user terminal device; and the reporting module is used to send data to the target user.

[0021] In the embodiment of the present invention, the monitoring platform can achieve multiple purposes such as storage, monitoring, analysis, management and early warning of electrical signals, namely cable circulation data, thereby achieving the purpose of ensuring long-term stable operation of electricity.

[0022] In an optional embodiment, the monitoring data management module includes: a data editing unit, a data query unit, a data display unit and a data download unit; the data editing unit is used to determine whether the data editing function is open to the user terminal device; the data query unit is used to retrieve data from the database; the data display unit is used to visually display the data retrieved by the data query unit; the data download unit is used to send the download address to the user terminal device.

[0023] In the embodiment of the present invention, the user terminal device can perform various operations on the data through the monitoring data management module, such as query, edit, download, visual display, etc., thereby achieving the purpose of improving the troubleshooting efficiency.

[0024] In a second aspect, the present invention provides a cable circulation monitoring method using TMR magnetic balance measurement of a cable circulation monitoring system using TMR magnetic balance measurement according to any one of the first aspects of the embodiments, comprising: obtaining initial electrical signals of phases A, B and C; collecting grounding cable circulation data of phases A, B and C in real time or periodically; storing electrical signals corresponding to the collected grounding cable circulation data of phases A, B and C; and comparing the electrical signals corresponding to the grounding cable circulation data of phases A, B and C with the initial electrical signals of phases A, B and C to generate monitoring results.

[0025] In an embodiment of the present invention, by comparing the electrical signal collected by the cable circulation monitoring system of TMR magnetic balance measurement, namely the cable circulation data, with the initial electrical signal, the purpose of real-time monitoring of the circulation data and cable status is achieved, and faults are discovered in time, thereby improving the safety of cable operation.

[0026] In an optional embodiment, the method further includes: obtaining a comparison result between the electrical signal corresponding to the grounding cable circulation data of any phase and the corresponding initial electrical signal; when the comparison result is abnormal, sending an early warning message to the user terminal device.

[0027] In the embodiment of the present invention, by sending early warning information to the user terminal device in a timely manner, timely processing of abnormalities is achieved, and the reliability of power operation is improved.

[0028] In an optional embodiment, the method further includes: obtaining grounding cable external break signals of phases A, B and C and tunnel environment information; and determining the fault factor and fault range based on the comparison results, the grounding cable external break signals and the tunnel environment information.

[0029] In the embodiment of the present invention, based on the relevant information collected by the collection unit, namely the ground cable external break signal and the tunnel environment information, combined with the comparison results, the fault factor and fault range are judged, thereby providing a basis for handling the cable fault.

[0030] In an optional implementation, the method further includes: generating a monitoring report based on the comparison result, the fault factor, and the fault scope, and sending the report to the target user.

[0031] In the embodiment of the present invention, by generating a monitoring report and sending it to a target user, the purpose of pushing the cable operation status to the target user is achieved, and the real-time and convenience of cable monitoring are improved.

[0032] In a third aspect, the present invention provides a computer device comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the cable circulating current monitoring method using TMR magnetic balance measurement according to the second aspect or any corresponding embodiment thereof by executing the computer instructions.

[0033] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the cable circulating current monitoring method using TMR magnetic balance measurement according to the second aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 is a schematic diagram of a cable circulating current monitoring system using TMR magnetic balance measurement according to an embodiment of the present invention;

[0036] Figure 2 is a schematic diagram of a circulating current data collector for any phase-grounded cable according to an embodiment of the present invention;

[0037] Figure 3 is an overall schematic diagram of a circulating current data collector for any phase-grounded cable according to an embodiment of the present invention;

[0038] Figure 4 2 is an overall schematic diagram of a cable circulating current monitoring system using TMR magnetic balance measurement according to an embodiment of the present invention;

[0039] Figure 5 is a schematic diagram of a data transmission processing unit according to an embodiment of the present invention;

[0040] Figure 6 is a schematic diagram of another data transmission processing unit according to an embodiment of the present invention;

[0041] Figure 7 is a schematic structural diagram of a server of a monitoring platform according to an embodiment of the present invention;

[0042] Figure 8 is a schematic structural diagram of a monitoring data management module according to an embodiment of the present invention;

[0043] Figure 9 1 is a flow chart of a cable circulating current monitoring method using TMR magnetic balance measurement according to an embodiment of the present invention;

[0044] Figure 10 Schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0046] It should be noted that, in the description of the present invention, the terms "first," "second," and the like are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include additional steps or elements not expressly listed or inherent to such process, method, product, or apparatus. The terms "mounted," "connected," and "connected" are to be broadly construed, and may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; internal communication between two components; wireless or wired connections. Those skilled in the art will understand the specific meanings of these terms in the present invention.

[0047] Traditional methods for monitoring circulating current primarily involve measuring the insulation resistance of the outer sheath during a power outage or measuring the circulating current of the metal sheath of high-voltage cables with a clamp-on ammeter. However, in recent years, to improve transmission line reliability, high-voltage cable outages for maintenance have become increasingly rare. Furthermore, according to existing cable operating procedures, traditional manual measurement of circulating current takes too long, making it difficult to detect and address defects in a timely manner. Furthermore, manual testing is not only labor-intensive but also poses safety risks. Therefore, online monitoring of cable sheath grounding current is becoming increasingly important. Currently, the cable grounding current detectors used in cable grounding current monitoring systems are primarily CT current transformers. The grounding current generated by cable defects is typically in the 10-ampere range, and the resulting temperature change is typically greater than 5°C. When a power cable defect occurs, its sheath grounding current increases significantly. Monitoring the grounding current can help determine the cable's operating status, but different cable installation and grounding methods affect the grounding current, and conventional circulating current monitoring devices have low sensitivity, making it difficult to detect even minor defects.

[0048] Existing circulating current sensors are large, and adding sensors such as partial discharge and temperature sensors to them can cause problems. For example, when installed in a grounding box, the space within the cable grounding box makes it difficult to install a partial discharge sensor. Even if it were possible, the coexistence of multiple magnetic materials in the confined space could lead to electromagnetic compatibility issues. Because partial discharge sensors typically use through-hole current transformers with high-frequency magnetic cores, magnetic leakage inevitably occurs, leading to electromagnetic interference between the partial discharge sensor and the circulating current sensor, affecting measurement accuracy. Furthermore, the excessive number of connecting wires can easily introduce faults and cause operational inconvenience for maintenance personnel. If installed on cable connectors, the excessive number of sensors and connecting wires can easily affect the long-term stable operation of the power supply. Given the above, there is an urgent need for a cable sheath grounding current monitoring system that can ensure long-term stable power operation, accurately measure cable circulating current, and efficiently troubleshoot cable faults.

[0049] According to an embodiment of the present invention, a cable circulation monitoring system for TMR magnetic balance measurement is provided, which includes: an improved A-phase, B-phase and C-phase grounding cable circulation data collector based on a TMR magnetic sensitive sensor chip, a data transmission processing unit and a monitoring platform; the data transmission processing unit is electrically connected to the A-phase, B-phase and C-phase grounding cable circulation data collector and is signal-connected to the monitoring platform; the A-phase, B-phase or C-phase grounding cable circulation data collector is used to collect the A-phase, B-phase or C-phase grounding cable circulation data and convert the grounding cable circulation data into a corresponding electrical signal; the data transmission processing unit is used to receive the electrical signal and send the electrical signal to the monitoring platform, and the monitoring platform is used to store the electrical signal.

[0050] Optionally, Figure 1 Schematic diagram of a cable circulating current monitoring system based on TMR magnetic balance measurement according to an embodiment of the present invention. Figure 1 As shown, the Phase A, Phase B, and Phase C grounded cable circulating current data collectors are TMR current sensors based on improved TMR magnetic sensing chips. Based on a highly sensitive TMR magnetic sensing chip and employing a magnetodynamic balance design principle, these current sensors are ideally suited for high-precision, high-linearity, and dynamic range cable sheath grounding current monitoring scenarios. Specifically, the technical specifications of the TMR current sensor in this embodiment are as follows: measurement range: 0-200A; measurable frequency signals from 0 to 100kHz; accuracy ≤5%, mA-level current measurement sensitivity; operating temperature range: -25°C to 60°C; and pass level 4 EMC testing for power frequency magnetic fields.

[0051] In an embodiment of the present invention, based on a high-sensitivity TMR magnetic sensor chip, the TMR current sensor used in the cable circulation monitoring system, i.e., the A-phase, B-phase, and C-phase grounding cable circulation data collector, is designed using the magnetodynamic balance design principle. This achieves the purpose of improving the cable sheath circulation monitoring accuracy, thereby solving the problem of low cable circulation measurement accuracy.

[0052] In some optional embodiments, the improved A-phase, B-phase or C-phase grounding cable circulating current data collector based on the TMR magnetic sensor chip adopts a magnetic gap symmetrical open-loop structure, the number of magnetic gaps is an integer multiple of two, any two magnetic gaps constitute a signal channel, and any signal channel contains two TMR magnetic sensor chips, and the two TMR magnetic sensor chips are respectively located in two symmetrical magnetic gaps of any signal channel.

[0053] Optionally, the core of the TMR current sensor, or any phase grounded cable circulating current data collector, is to convert the sensed magnetic field signal into a resistance signal via a TMR magnetic sensor chip, and then convert it into an electrical signal when power is applied. The sensor adopts a symmetrical open-loop structure with 2n magnetic gaps (n is a positive integer), with each two magnetic gaps forming a signal channel. The TMR magnetic sensor chips in each channel are located in symmetrical magnetic gaps. Because the external magnetic field interference at the magnetic gaps is the same, the magnetic signals generated by the measured current are opposite. Signal differentiation eliminates the uniform external magnetic field interference at the magnetic gap opening, enhancing the signal by twice the original value and significantly improving the signal-to-noise ratio. The TMR magnetic sensor chip uses a Wheatstone full-bridge device to meet the requirements of temperature drift, interference resistance, and noise reduction. A zero-magnetic high-resistance device is used for low power consumption, and a zero-magnetic low-resistance device is used for low noise. Preferably, this embodiment uses a TMR magnetic sensor chip with a 1k resistor.

[0054] In some optional embodiments, when the number of magnetic gaps is two, the circulating current data collector for any phase-grounded cable includes: two TMR magnetic sensor chips, a first differential amplifier circuit, a second differential amplifier circuit, a third differential amplifier circuit, a first filter circuit, an amplifier circuit, a second filter circuit, an ADC circuit, an MCU, a temperature and humidity sensor, and a communication unit; the output signals of the two TMR magnetic sensor chips are respectively input into the third differential amplifier circuit through the first differential amplifier circuit and the second differential amplifier circuit, the output signal of the third differential amplifier circuit is sequentially input into the ADC circuit through the first filter circuit, the amplifier circuit, and the second filter circuit, the MCU receives the output signal of the ADC circuit and the environmental parameters collected by the temperature and humidity sensor, and sends the output signal to the communication unit; the first differential amplifier circuit, the second differential amplifier circuit, and the third differential amplifier circuit are used to amplify the signal output by the TMR magnetic sensor chip and eliminate the influence of the external magnetic field signal, the first filter circuit uses active filtering for impedance matching, the amplifier circuit is used to amplify the signal, the second filter circuit uses passive filtering to prevent frequency aliasing, and the MCU is used to adjust the signal channel gain according to the environmental parameters and perform digital phase-sensitive detection processing on the output signal of the ADC circuit.

[0055] Optionally, Figure 2 Schematic diagram of any phase grounded cable circulating current data collector according to an embodiment of the present invention. Figure 2 As shown, when there are two magnetic gaps, the electrical signals output by the TMR magnetic sensor chip are differentially amplified by the first and second differential amplifier circuits, respectively. A third differential amplifier circuit then differentially amplifies the signals output by the first and second differential amplifier circuits, thereby eliminating the influence of external magnetic field signals. In applications requiring a large dynamic range and low noise, an ultra-low-noise instrumentation amplifier is used. In applications requiring low 1 / f noise, a phase-sensitive detection method is used to eliminate low-frequency noise. Filtering can remove out-of-band noise. In this embodiment, the filter circuits are strategically placed between each amplifier circuit. This not only gradually improves the signal-to-noise ratio and removes interference introduced by each unit circuit, but also avoids the problem of centralized filtering, which makes it difficult to filter out noise introduced by subsequent circuits, or inadequate noise filtering in previous circuits, leading to excessive noise amplification and limiting. It also avoids the problem of subsequent circuits having difficulty removing noise, resulting in a reduced signal-to-noise ratio and difficulty in signal recognition. The first filter circuit employs active filtering, which reduces the filter size while preventing impedance mismatch with the next-stage signal processing unit (the first amplifier circuit). The second filter circuit uses passive filtering, which mainly plays an anti-aliasing role in ADC circuit sampling. In this embodiment, a low-noise operational amplifier is used to build an amplification circuit to amplify the signal to be measured to an appropriate size according to actual monitoring needs to achieve the requirements of accuracy and dynamic measurement range.

[0056] The ADC circuit digitizes the electrical signal output by the second filter circuit, which can effectively reduce the influence of noise during transmission and enhance the anti-interference ability. For example, when the maximum measurement value is 200A and the mA-level sensitivity is achieved, the effective dynamic range of the ADC circuit is set to >100dB, and the internal PGA is adapted to achieve a dynamic range of 120dB, leaving a margin for measurement. As a preferred solution, this embodiment gives priority to a 24-bit ADC with an effective number of 18 bits, a built-in PGA, and a sampling rate of more than 20ksps. It should be noted that if a harmonic test function is required, the ADC can use a device with a harmonic detection function. Preferably, the harmonic test function can also be implemented in the MCU, and the ADC selects a multi-channel ADC.

[0057] In an embodiment of the present invention, the MCU receives the (sampling) signal output by the ADC circuit and adjusts the signal channel gain according to the environmental parameters sampled by the temperature and humidity sensor. The MCU can perform digital phase-sensitive detection processing on the sampled ADC data to improve the signal-to-noise ratio. The MCU can also be used to identify useful signals and perform edge computing and other functions. The MCU transmits the processed signal to a host computer such as a monitoring platform through a communication unit. The MCU can adopt an STM32L4xx series single-chip microcomputer. The communication unit performs the communication function between the MCU and the host computer such as the monitoring platform. The communication unit can adopt different communication methods, among which the wireless method can adopt Bluetooth, Zigbee, Lora, etc., and the wired method can adopt RS485, optical cable, etc.

[0058] In some optional embodiments, any phase-grounded cable circulating current data collector also includes: a power supply module and a double-pole double-throw analog switch; the power supply module is used to provide a reference voltage for the ADC circuit, and the power supply module also provides a reference voltage for multiple TMR magnetic sensor chips through the double-pole double-throw analog switch, and the double-pole double-throw analog switch is used to flip the reference voltage to assist in realizing the phase-sensitive detection function and reduce noise interference.

[0059] Optionally, Figure 3 1 is a schematic diagram of an overall circuit data collector for a phase-to-ground cable according to an embodiment of the present invention. Figure 3 As shown, the power module provides a reference voltage for the ADC circuit and powers the TMR magnetic sensor chip via a double-pole double-throw analog switch. The double-pole double-throw analog switch can reverse the reference voltage or polarity and transmit it to the TMR magnetic sensor chip. Combined with data processing by the MCU, it can implement phase-sensitive detection, eliminating the effects of 1 / f noise. When measuring DC or ultra-low frequency signals, this can improve the signal-to-noise ratio and reduce noise interference. In this embodiment of the present invention, the functional unit within the dashed box implements the function of a signal channel. If a magnetic core structure with a different magnetic gap is used, the two TMR magnetic sensor chips can act as a single signal communication channel for signal preprocessing.

[0060] In some optional embodiments, the system also includes: an acquisition box, an acquisition unit and a power supply; the A-phase, B-phase and C-phase grounding cable circulation data collectors are electrically connected to the acquisition unit through the acquisition box, the acquisition unit is electrically connected to the data transmission processing unit, the power supply powers the cable circulation monitoring system for TMR magnetic balance measurement, and the acquisition box is used to reduce wiring complexity and reduce signal interference.

[0061] Optionally, Figure 4 FIG. 1 is an overall schematic diagram of a cable circulating current monitoring system based on TMR magnetic balance measurement according to an embodiment of the present invention. Figure 4 As shown, the grounded cable circulating current data collectors for phases A, B, and C are electrically connected to the acquisition unit via an acquisition box. Using the acquisition box, the data collector circuit connections for the three-phase cables are connected to a single physical medium, reducing cable complexity and signal interference. The acquisition unit can be used to collect various cable data. The acquisition unit is electrically connected to the data transmission processing unit and sends the collected data to the data transmission processing unit for processing. The power supply provides power to the cable circulating current monitoring system using TMR magnetic balance measurement, including the acquisition unit and the data transmission processing unit.

[0062] In some optional embodiments, the acquisition unit includes: a vibration acquisition unit, an environment acquisition unit and a video acquisition unit; the vibration acquisition unit is used to detect the external break signal of the grounding cable of phase A, phase B and phase C, and the grounding cable external break signal is the corresponding environmental change signal after the grounding cable is damaged in the external environment; the environment acquisition unit includes: a micro-meteorological monitoring sensor and a temperature sensor, and the micro-meteorological monitoring sensor is used to detect the tunnel environment information of phase A, phase B and phase C; the video acquisition unit is used to collect video and image information.

[0063] Optionally, the vibration collection unit is used to detect external damage signals in the environment where the A-phase grounding cable, the B-phase grounding cable and the C-phase grounding cable are located; the environment collection unit includes a micrometeorological monitoring sensor and a temperature sensor, which is used to detect tunnel environmental information such as oxygen, harmful gases (such as CO, CO2, H2S, CH4), smoke, temperature and humidity in the tunnel where the A-phase grounding cable, the B-phase grounding cable and the C-phase grounding cable are located, so as to determine the fault factors and the fault scope; the video collection unit can collect video and image information, such as whether there is human damage, current status and other information.

[0064] In some optional embodiments, the data transmission processing unit includes: a circulating current detection circuit, a microprocessor and a wireless communication device; the A-phase, B-phase and C-phase grounding cable circulating current data collectors are electrically connected to the circulating current detection circuit, the circulating current detection circuit is electrically connected to the microprocessor, the microprocessor is electrically connected to the wireless communication device, the circulating current detection circuit and the microprocessor are used to convert and process the electrical signals output by the A-phase, B-phase and C-phase grounding cable circulating current data collectors, and the wireless communication device is used to communicate with the monitoring platform.

[0065] Optionally, Figure 5 FIG is a schematic diagram of a data transmission processing unit according to an embodiment of the present invention. Figure 5 As shown, the data processing and transmission unit includes a circulating current detection circuit, a microprocessor, and a wireless communication device. By providing a housing for the data processing and transmission unit, the circulating current detection circuit, microprocessor, and wireless communication device can be encapsulated within the housing. The circulating current data collectors for the grounded cables of phases A, B, and C are electrically connected to the circulating current detection circuit, which in turn is electrically connected to the microprocessor and the wireless communication device. This allows operations such as receiving data from the grounded cables of phases A, B, and C, processing the data, and transmitting it to a host computer.

[0066] In some optional embodiments, the circulating current detection circuit includes: a current sensing coil, a resistor and a voltage measurement module; the A-phase, B-phase and C-phase grounding cable circulating current data collector is electrically connected to the current sensing coil, and the current sensing coil is connected in parallel with the resistor to form a first parallel loop; the voltage measurement module is connected in parallel with the resistor to form a second parallel loop; the first parallel loop and the second parallel loop are respectively electrically connected to the microprocessor.

[0067] Optionally, Figure 6 FIG. 1 is a schematic diagram of another data transmission processing unit according to an embodiment of the present invention. Figure 6 As shown, the circulating current detection circuit consists of a current sensing coil, a resistor and a voltage measurement module. Figure 6 The current sensing coil and voltage measurement module can convert electrical signals into current and voltage signals, send these signals to the microprocessor for data processing, and then transmit data through wireless communication devices.

[0068] In some optional embodiments, the monitoring platform includes: a user terminal device and a server; the server includes: a receiving module, a user management module, a monitoring data management module, a database, an early warning module and a reporting module; the receiving module is used to receive the request information of the user terminal device and the electrical signal sent by the data transmission processing unit; the user management module is used to receive the login request sent by the user terminal device, and manage user information and authorization information; the monitoring data management module is used to compare, count and manage the electrical signals sent by the data transmission processing unit; the database is used to store the electrical signals, user information, authorization information and monitoring comparison data corresponding to the grounding cable circulation data collected by the A-phase, B-phase and C-phase grounding cable circulation data collector; the early warning module is used to send early warning information to the user terminal device; and the reporting module is used to send data to the target user.

[0069] Optionally, the monitoring platform includes a user terminal device and a server, and users can register and log in, query data, edit data, and download data through the user terminal device. Figure 7 FIG. 1 is a schematic diagram of the structure of a server of a monitoring platform according to an embodiment of the present invention. Figure 7 As shown, the server includes: a receiving module, a user management module, a monitoring data management module, a database, an early warning module, and a reporting module. The receiving module is used to receive request information sent by a user terminal device and also to receive data uploaded by a data transmission processing unit. The user management module manages user information and authorization information when a user terminal device initiates a login request. The monitoring data management module compares, compiles statistics, and manages the monitoring data uploaded by the data transmission processing unit. The database stores electrical signals, user information, authorization information, and monitoring comparison data corresponding to the grounding cable circulating current data collected by the A-phase grounding cable circulating current data collector, the B-phase grounding cable circulating current data collector, and the C-phase grounding cable circulating current data collector. The early warning module pushes early warning information to the user terminal device when an abnormality occurs in the monitoring data. The reporting module sends data to the target user, such as to the server of the relevant power grid management department.

[0070] In some optional embodiments, the monitoring data management module includes: a data editing unit, a data query unit, a data display unit and a data download unit; the data editing unit is used to determine whether the data editing function is open to the user terminal device; the data query unit is used to retrieve data from the database; the data display unit is used to visualize the data retrieved by the data query unit; the data download unit is used to send the download address to the user terminal device.

[0071] Optionally, Figure 8 FIG. 1 is a schematic diagram of the structure of a monitoring data management module according to an embodiment of the present invention. Figure 8As shown, the monitoring data management module includes: a data editing unit, a data query unit, a data display unit and a data download unit. Among them, the data editing unit, the data query unit and the data download unit are all connected to the database, and can respectively edit, query and download the data in the database. Specifically, after the user terminal device initiates a data editing request, the data editing unit determines whether the requesting user has authorized it. If the requesting user has authorized it, the corresponding data editing function is opened to the requesting user of the user terminal device; after the user terminal device initiates a data query request, the data query unit retrieves relevant data from the database; the data display unit can display the relevant data retrieved by the data query unit in a visual form, such as a table or a curve; after the user terminal device initiates a data download request, the data download unit retrieves relevant data from the database and feeds back the download address to the user terminal device.

[0072] According to an embodiment of the present invention, a cable circulating current monitoring method using TMR magnetic balance measurement of a cable circulating current monitoring system using TMR magnetic balance measurement according to any one of the first aspects of the embodiments of the present invention is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0073] In this embodiment, a cable circulating current monitoring method based on TMR magnetic balance measurement is provided, which can be used in the above-mentioned mobile terminals, such as mobile phones, central processing units, etc. Figure 9 FIG. 1 is a flow chart of a cable circulating current monitoring method using TMR magnetic balance measurement according to an embodiment of the present invention. Figure 9 As shown, the process includes the following steps:

[0074] Step S901: Acquire initial electrical signals for phases A, B, and C. Optionally, first establish a cable circulating current monitoring system for TMR magnetic balance measurement, i.e., install a grounded cable circulating current data collector for phase A, phase B, and phase C on the cable. Acquire initial electrical signals for phases A, B, and C, i.e., initially acquired electrical signals indicating normal operation of phases A, B, and C. The initial electrical signals for phases A, B, and C may also be multiple sets of preset values.

[0075] Step S902: Real-time or periodic collection of ground cable circulation data for phases A, B, and C. Optionally, based on actual needs, periodic or real-time collection of ground cable circulation data for phases A, B, and C of the cable is performed in the same manner as the initial electrical signal collection process.

[0076] Step S903 stores the electrical signals corresponding to the collected ground cable circulating current data for phases A, B, and C. Optionally, by repeatedly collecting initial electrical signals for phases A, B, and C, an initial database of ground cable circulating currents for phases A, B, and C of the cable can be established on the monitoring platform. Similarly, real-time or periodic ground cable circulating current data for phases A, B, and C can also be stored in the monitoring platform's database.

[0077] Step S904 compares the electrical signals corresponding to the ground cable circulation data of phases A, B, and C with the initial electrical signals of phases A, B, and C to generate a monitoring result. Optionally, the monitoring result of any phase cable can be obtained by comparing the ground cable circulation data of any phase with the corresponding initial electrical signal.

[0078] The cable circulating current monitoring method using TMR magnetic balance measurement provided in this embodiment achieves the purpose of real-time monitoring of the circulating current data and cable status by comparing the electrical signal collected by the cable circulating current monitoring system using TMR magnetic balance measurement, namely the cable circulating current data, with the initial electrical signal, thereby achieving the effect of timely fault detection and improving the safety of cable operation. The present invention implements separate detection of the A-phase, B-phase, and C-phase cables. This detection method can more accurately detect the operating status of each phase busbar, thereby achieving precise fault location and classification, and improving the accuracy of fault diagnosis.

[0079] In some optional implementations, after step S904, the method further includes:

[0080] Step a1: Obtain a comparison result between an electrical signal corresponding to the ground cable circulating current data of any phase and a corresponding initial electrical signal.

[0081] Step a2: When the comparison result is abnormal, an early warning message is sent to the user terminal device.

[0082] This embodiment obtains the comparison result of the ground cable circulating current data of any phase in step S904 and sends an early warning message to the user terminal device if the comparison result is abnormal. This achieves the purpose of timely fault detection and early warning, achieves the effect of timely handling of abnormalities, and thus improves the reliability of power operation.

[0083] In some optional embodiments, after step a2 above, the method further includes:

[0084] Step b1: Obtain ground cable external break signals and tunnel environment information for phases A, B, and C. Optionally, when the comparison result is abnormal, in addition to sending an early warning message, the acquisition unit can be controlled to start working to investigate possible cable failure factors.

[0085] Step b2: Determine the fault factor and fault scope based on the comparison results, the ground cable external rupture signal, and tunnel environmental information. For example, the fault factor and fault scope are determined based on the comparison results of the ground cable circulating current data of any phase in step S904, the ground cable external rupture signal, and tunnel environmental information, such as environmental parameters such as oxygen, hazardous gases (CO, CO2, H2S, CH4), smoke, temperature, and humidity in the tunnel.

[0086] In some optional embodiments, after step b2 above, the method further includes generating a monitoring report based on the comparison results, fault factors, and fault scope, and sending the report to the target user. Optionally, by sending the cable monitoring report to relevant departments and / or superiors, the real-time cable operation status is communicated to the target user, improving the real-time and convenience of cable monitoring. Furthermore, by integrating data to generate the cable monitoring report, user terminals can easily download the relevant data via the data download unit.

[0087] An embodiment of the present invention further provides a computer device, Figure 10 Schematic diagram of the hardware structure of the computer device according to the embodiment of the present invention. Figure 10 As shown, the computer device includes: one or more processors 10, memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components utilize different buses to communicate with each other and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in the memory or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Equally, multiple computer devices can be connected, and each device provides part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 10 A processor 10 is taken as an example.

[0088] The processor 10 may be a central processing unit, a network processor, or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic, or any combination thereof.

[0089] The memory 20 stores instructions that can be executed by at least one processor 10, so as to enable at least one processor 10 to execute the method shown in the above embodiment.

[0090] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created based on the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0091] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0092] The computer device also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 20 can be connected via a bus or other means. Figure 10 The bus connection is taken as an example.

[0093] The input device 30 can receive input digital or character information and generate key signal input related to user settings and function control of the computer device, such as a touch screen, a touch pad, a pointer, one or more mouse buttons, etc. The output device 40 may include a display device, an auxiliary lighting device, etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a monitor, and a plasma display.

[0094] The embodiment of the present invention also provides a computer-readable storage medium. The above-mentioned method according to the embodiment of the present invention can be implemented in hardware, firmware, or implemented as a computer code that can be recorded in a storage medium, or implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state drive, etc.; further, the storage medium can also include a combination of the above-mentioned types of memory. It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0095] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cable circulating current monitoring system using TMR magnetic balance measurement, characterized in that: The system includes: an improved A-phase, B-phase, and C-phase grounding cable circulating current data collector based on a TMR magnetic sensor chip, a data transmission processing unit, and a monitoring platform; the data transmission processing unit is electrically connected to the A-phase, B-phase, and C-phase grounding cable circulating current data collector and is signal-connected to the monitoring platform; the A-phase, B-phase, or C-phase grounding cable circulating current data collector is used to collect the A-phase, B-phase, or C-phase grounding cable circulating current data and convert the grounding cable circulating current data into corresponding electrical signals; the data transmission processing unit is used to receive the electrical signals and send the electrical signals to the monitoring platform, and the monitoring platform is used to store the electrical signals; The A-phase, B-phase or C-phase grounding cable circulating current data collector improved based on the TMR magnetic sensor chip adopts a magnetic gap symmetrical open-loop structure. The number of magnetic gaps is an integer multiple of two. Any two magnetic gaps form a signal channel, and any signal channel contains two TMR magnetic sensor chips. When the number of magnetic gaps is two, the data collector for the circulating current of any phase-grounded cable includes: two TMR magnetic sensor chips, a first differential amplifier circuit, a second differential amplifier circuit, a third differential amplifier circuit, a first filter circuit, an amplifier circuit, a second filter circuit, and an ADC circuit; the output signals of the two TMR magnetic sensor chips are respectively input into the third differential amplifier circuit through the first differential amplifier circuit and the second differential amplifier circuit, and the output signal of the third differential amplifier circuit is sequentially input into the ADC circuit after passing through the first filter circuit, the amplifier circuit, and the second filter circuit; Any phase-grounded cable circulating current data collector also includes: a power supply module and a double-pole double-throw analog switch; the power supply module is used to provide a reference voltage for the ADC circuit, and the power supply module also provides a reference voltage for multiple TMR magnetic sensor chips through the double-pole double-throw analog switch, and the double-pole double-throw analog switch is used to flip the reference voltage to assist in realizing the phase-sensitive detection function and reduce noise interference.

2. The cable circulating current monitoring system of TMR magnetic balance measurement according to claim 1, characterized in that: The two TMR magnetic sensing chips are respectively located in two symmetrical magnetic gaps of the arbitrary signal channel.

3. The cable circulating current monitoring system of TMR magnetic balance measurement according to claim 2, characterized in that: When the number of magnetic gaps is two, the circulating current data collector for any phase grounded cable further includes: an MCU, a temperature and humidity sensor, and a communication unit; The MCU receives the output signal of the ADC circuit and the environmental parameters collected by the temperature and humidity sensor, and sends the output signal to the communication unit; The first differential amplifier circuit, the second differential amplifier circuit, and the third differential amplifier circuit are used to amplify the signal output by the TMR magnetic sensor chip and eliminate the influence of the external magnetic field signal. The first filter circuit uses active filtering for impedance matching. The amplifier circuit is used to amplify the signal. The second filter circuit uses passive filtering to prevent frequency aliasing. The MCU is used to adjust the signal channel gain according to the environmental parameters and perform digital phase-sensitive detection processing on the output signal of the ADC circuit.

4. The cable circulating current monitoring system of TMR magnetic balance measurement according to claim 1, characterized in that: The system also includes: an acquisition box, an acquisition unit, and a power supply; the A-phase, B-phase, and C-phase grounding cable circulating current data collectors are electrically connected to the acquisition unit through the acquisition box, and the acquisition unit is electrically connected to the data transmission processing unit. The power supply supplies power to the cable circulating current monitoring system for TMR magnetic balance measurement. The acquisition box is used to reduce wiring complexity and reduce signal interference.

5. The cable circulating current monitoring system of TMR magnetic balance measurement according to claim 4, characterized in that: The acquisition unit includes: a vibration acquisition unit, an environment acquisition unit and a video acquisition unit; the vibration acquisition unit is used to detect the external damage signal of the grounding cable of phase A, phase B and phase C, and the grounding cable external damage signal is the corresponding environmental change signal after the grounding cable is damaged in the external environment; the environment acquisition unit includes: a micro-meteorological monitoring sensor and a temperature sensor, and the micro-meteorological monitoring sensor is used to detect the tunnel environment information of phase A, phase B and phase C; the video acquisition unit is used to collect video and image information.

6. The cable circulating current monitoring system of TMR magnetic balance measurement according to claim 1, characterized in that: The data transmission processing unit includes: a circulating current detection circuit, a microprocessor and a wireless communication device; the A-phase, B-phase and C-phase grounding cable circulating current data collector is electrically connected to the circulating current detection circuit, the circulating current detection circuit is electrically connected to the microprocessor, and the microprocessor is electrically connected to the wireless communication device. The circulating current detection circuit and the microprocessor are used to convert and process the electrical signals output by the A-phase, B-phase and C-phase grounding cable circulating current data collector, and the wireless communication device is used to communicate with the monitoring platform.

7. The cable circulating current monitoring system of TMR magnetic balance measurement according to claim 6, characterized in that: The circulating current detection circuit includes: a current sensing coil, a resistor and a voltage measurement module; the A-phase, B-phase and C-phase grounding cable circulating current data collector is electrically connected to the current sensing coil, and the current sensing coil is connected in parallel with the resistor to form a first parallel loop; the voltage measurement module is connected in parallel with the resistor to form a second parallel loop; the first parallel loop and the second parallel loop are respectively electrically connected to a microprocessor.

8. The cable circulating current monitoring system of TMR magnetic balance measurement according to claim 1, characterized in that: The monitoring platform includes: a user terminal device and a server; the server includes: a receiving module, a user management module, a monitoring data management module, a database, an early warning module and a reporting module; the receiving module is used to receive the request information of the user terminal device and the electrical signal sent by the data transmission processing unit; the user management module is used to receive the login request sent by the user terminal device and manage user information and authorization information; the monitoring data management module is used to compare, count and manage the electrical signals sent by the data transmission processing unit; the database is used to store the electrical signals, user information, authorization information and monitoring comparison data corresponding to the grounding cable circulation data collected by the A-phase, B-phase and C-phase grounding cable circulation data collector; the early warning module is used to send early warning information to the user terminal device; the reporting module is used to send data to the target user.

9. The cable circulating current monitoring system of TMR magnetic balance measurement according to claim 8, characterized in that: The monitoring data management module includes: a data editing unit, a data query unit, a data display unit and a data download unit; the data editing unit is used to determine whether the data editing function is open to the user terminal device; the data query unit is used to retrieve data from the database; the data display unit is used to visually display the data retrieved by the data query unit; the data download unit is used to send the download address to the user terminal device.

10. A cable circulating current monitoring method using TMR magnetic balance measurement of the cable circulating current monitoring system according to any one of claims 1 to 9, characterized in that: The method comprises: Acquire initial electrical signals of phase A, phase B, and phase C; Real-time or periodic collection of ground cable circulation data for phases A, B, and C; Storing the electrical signals corresponding to the collected ground cable loop current data of phases A, B and C; The electrical signals corresponding to the ground cable loop current data of phases A, B, and C are compared with the initial electrical signals of phases A, B, and C to generate a monitoring result.

11. The cable circulating current monitoring method using TMR magnetic balance measurement according to claim 10, characterized in that: The method further comprises: Obtaining a comparison result between an electrical signal corresponding to the ground cable circulating current data of any phase and a corresponding initial electrical signal; When the comparison result is abnormal, an early warning message is sent to the user terminal device.

12. The cable circulating current monitoring method using TMR magnetic balance measurement according to claim 11, characterized in that: The method further comprises: Obtain ground cable external break signals of phases A, B, and C, as well as tunnel environment information; The fault factor and fault range are determined based on the comparison result, the ground cable external failure signal and the tunnel environment information.

13. The cable circulating current monitoring method using TMR magnetic balance measurement according to claim 12, characterized in that: The method further comprises: A monitoring report is generated based on the comparison results, fault factors and fault scope and sent to the target user.

14. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the cable circulating current monitoring method using TMR magnetic balance measurement according to any one of claims 10 to 13 by executing the computer instructions.

15. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the cable circulating current monitoring method using TMR magnetic balance measurement according to any one of claims 10 to 13.

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