Cable sheath ring current online monitoring device, system and method

Abstract

The invention discloses a cable sheath circulation online monitoring device, system and method. The device comprises a power supply module, an acquisition module, a programmable hardware module and a processor, the programmable hardware module monitors whether the target current meets a preset fault condition or not in real time, and if yes, a trigger signal is generated; the processor is used for receiving and processing the target current at intervals or receiving and processing the target current in real time when receiving the sleep signal or the wake-up signal, and generating cable sheath monitoring data; and when the trigger signal is received, an alarm signal is generated. In the invention, the processor is switched into a corresponding sleep mode and a wake-up working mode according to different power supply modes, the low power consumption performance requirement of the device can be met in the sleep mode, and in the intermittent sleep process of the device, in order to improve the reliability of the device, the programmable hardware module can monitor the current in real time, so that the reliability of the device is improved. And the capturing of instantaneous alarm events is not influenced, so that the device is suitable for different application scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to an online monitoring device, system and method for cable sheath circulating current. Background Art

[0002] The sheath circulation monitoring terminal is an intelligent terminal device specially designed to monitor the induced current of the metal sheath of high-voltage single-core transmission cables. This type of equipment is mainly used to ensure the safe and stable operation of the power system and to extend the service life of the cable. When the high-voltage single-core cable is in operation, the alternating magnetic field generated by the working current will induce an electromotive force on the metal sheath. If the metal sheath forms a closed loop through the earth, a "ground loop" will be formed. This circulation will not only affect the current carrying capacity and service life of the cable, but may also cause damage to the cable sheath protector and even cause serious heating, which will pose a threat to the safe operation of the cable. The sheath circulation monitoring terminal is usually installed in a harsh environment, which affects the low power consumption performance and monitoring reliability design of the sheath circulation monitoring terminal, limiting the application scenarios of the sheath circulation monitoring terminal. Summary of the invention

[0003] The present invention provides a cable sheath circulating current online monitoring device, system and method, which are used to solve the technical problem that the existing sheath circulating current monitoring terminal is usually installed in a harsh environment, which affects the low power consumption performance and monitoring reliability design of the sheath circulating current monitoring terminal and limits the application scenarios of the sheath circulating current monitoring terminal.

[0004] A first aspect of the present invention provides an online monitoring device for cable sheath circulating current, comprising: a power supply module, a collection module, a programmable hardware module and a processor;

[0005] The power supply module is connected to the processor; the power supply module includes an internal battery module and a power supply component, which is used to provide power to the processor and send a sleep signal or a wake-up signal to the processor;

[0006] The acquisition module is used to obtain the target current of the cable sheath; the acquisition module is connected to the programmable hardware module and the processor respectively;

[0007] The programmable hardware module is connected to the processor and is used to monitor in real time whether the target current meets the preset fault condition, and if so, generates a trigger signal and sends it to the processor;

[0008] The processor is used to, when receiving a sleep signal, receive and process the target current at intervals to generate cable sheath monitoring data; when receiving a wake-up signal, receive and process the target current in real time to generate cable sheath monitoring data; and when receiving a trigger signal, generate an alarm signal.

[0009] Specifically, the power supply module also includes a rectifying and voltage-stabilizing circuit module; the internal battery module and the power-taking component are respectively connected to the input end of the rectifying and voltage-stabilizing circuit module;

[0010] The processor is provided with a power interface, and the processor is connected to the output end of the rectifying and voltage-stabilizing circuit module through the power interface.

[0011] Specifically, the acquisition module includes a data acquisition component and a sampling signal processing circuit unit connected in sequence;

[0012] The data acquisition component is installed around the cable sheath and is used to collect the grounding loop current of the cable sheath;

[0013] The sampling signal processing circuit unit is used to receive the ground loop current and perform integration and amplification processing to generate a target current for the cable sheath.

[0014] Specifically, the sampling signal processing circuit unit is connected to the processor and the programmable hardware module respectively, and is used to send the target current of the cable sheath to the processor and the programmable hardware module respectively.

[0015] Specifically, it also includes: a communication module;

[0016] The processor is provided with a communication interface, and the processor is connected to the communication module via the communication interface;

[0017] The processor is also used to, when receiving a sleep signal, upload the cable sheath monitoring data to the communication module according to a preset first sending frequency; when receiving a wake-up signal, upload the cable sheath monitoring data to the communication module according to a preset second sending frequency; when receiving a wake-up signal, send an alarm signal to the communication module; wherein the preset second sending frequency is greater than the preset first sending frequency.

[0018] Specifically, the power supply component supports any power supply mode of power supply by mutual induction, power supply by solar energy and power supply by external direct current power supply.

[0019] Specifically, the data acquisition component is composed of a plurality of Rogowski coils.

[0020] Specifically, the communication module is a suction cup antenna.

[0021] A second aspect of the present invention provides an online monitoring system for cable sheath circulating current, comprising a monitoring system and any of the above-mentioned online monitoring devices for cable sheath circulating current;

[0022] The monitoring system includes an intranet monitoring system and an extranet monitoring system, which is used to exchange information between the cable sheath circulating current online monitoring device and the intranet monitoring system through the power-specific APN card when the intranet monitoring system communicates normally; conversely, the cable sheath circulating current online monitoring device and the extranet monitoring system are exchanged through the extranet cloud master station and WeChat applet.

[0023] A third aspect of the present invention provides a method for online monitoring of cable sheath circulating current, comprising:

[0024] Obtain the target current of the cable sheath through the acquisition module;

[0025] Monitor in real time through a programmable hardware module whether the target current meets a preset fault condition, and if so, generate a trigger signal;

[0026] Send a sleep signal or a wake-up signal through the power supply module;

[0027] When the processor receives a sleep signal, it receives and processes the target current at intervals to generate cable sheath monitoring data; when it receives a wake-up signal, it receives and processes the target current in real time to generate cable sheath monitoring data; when it receives a trigger signal, it generates an alarm signal.

[0028] It can be seen from the above technical solutions that the present invention has the following advantages:

[0029] The present invention provides an online monitoring device, system and method for cable sheath circulation. The device includes: a power supply module, an acquisition module, a programmable hardware module and a processor; the power supply module is connected to the processor; the power supply module includes an internal battery module and a power extraction component, which is used to provide power to the processor and send a sleep signal or a wake-up signal to the processor; the acquisition module is used to obtain the target current of the cable sheath; the acquisition module is connected to the programmable hardware module and the processor respectively; the programmable hardware module is connected to the processor, and is used to monitor in real time whether the target current meets the preset fault condition, and if so, a trigger signal is generated and sent to the processor; the processor is used to, when receiving the sleep signal, receive and process the target current at intervals, and generate cable sheath monitoring data; when receiving the wake-up signal, receive and process the target current in real time, and generate cable sheath monitoring data; when receiving the trigger signal, an alarm signal is generated.

[0030] In the present invention, different power supply modes are provided. Under different power supply modes, the processor automatically switches to corresponding sleep mode and wake-up working mode. In sleep mode, the low power consumption performance requirement of the device can be met. A programmable hardware module is set. During the intermittent sleep of the device, the current can still be monitored in real time, which does not affect the capture of instantaneous alarm events, thereby improving the reliability of the device and solving the problem that the sheath circulating current monitoring terminal is usually installed in a harsh environment, which affects the low power consumption performance and monitoring reliability design of the sheath circulating current monitoring terminal, and limits the application scenarios of the sheath circulating current monitoring terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 A structural connection block diagram of a cable sheath circulating current online monitoring device provided in this application;

[0033] Figure 2 A schematic diagram of the current flow direction and the installation relationship of the Rogowski coil provided in this application;

[0034] Figure 3 A structural connection block diagram of a cable sheath circulation online monitoring system provided in this application;

[0035] Figure 4 A flowchart of the steps of a method for online monitoring of cable sheath circulating current provided in this application. DETAILED DESCRIPTION

[0036] The embodiments of the present invention provide a cable sheath circulating current online monitoring device, system and method, which are used to solve the technical problem that the existing sheath circulating current monitoring terminal is usually installed in a harsh environment, which affects the low power consumption performance and monitoring reliability design of the sheath circulating current monitoring terminal and limits the application scenarios of the sheath circulating current monitoring terminal.

[0037] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] See also Figure 1 , the first aspect of the present application provides an embodiment of a cable sheath circulating current online monitoring device, comprising: a power supply module, a collection module, a programmable hardware module and a processor;

[0041] The power supply module is connected to the processor; the power supply module includes an internal battery module and a power supply component, which is used to provide power to the processor and send a sleep signal or a wake-up signal to the processor;

[0042] The acquisition module is used to obtain the target current of the cable sheath; the acquisition module is connected to the programmable hardware module and the processor respectively;

[0043] The programmable hardware module is connected to the processor and is used to monitor in real time whether the target current meets the preset fault condition. If so, a trigger signal is generated and sent to the processor;

[0044] The processor is used to, when receiving a sleep signal, receive and process the target current at intervals to generate cable sheath monitoring data; when receiving a wake-up signal, receive and process the target current in real time to generate cable sheath monitoring data; and when receiving a trigger signal, generate an alarm signal.

[0045] It should be noted that in order to meet the diverse application scenarios, the power supply module includes an internal battery module and a power supply component; when the power supply component can supply power normally, power can be supplied by the power supply component, otherwise, power is supplied by the internal battery module. In order to achieve low power consumption performance of the device, the processor automatically switches to the corresponding sleep mode and wake-up working mode according to the sleep signal and wake-up signal associated with different power supply modes. Specifically, when the internal battery module supplies power, the processor will be in sleep mode; when the power supply component supplies power, the processor will be in wake-up working mode, thereby controlling the power consumption of the device to be very low.

[0046] Specifically, in sleep mode, the processor receives and processes the target current at intervals to generate cable sheath monitoring data; in wake-up working mode, the processor receives and processes the target current in real time to generate cable sheath monitoring data. The processor is provided with an AD sampling interface for performing analog-to-digital conversion on the received target current to generate cable sheath monitoring data.

[0047] In order to solve the problem that instantaneous faults are difficult to capture in sleep mode, the present invention uses a low-power programmable hardware module to monitor the circuit in real time to determine whether the target current meets the preset fault conditions. If it does, a trigger signal is generated to capture the instantaneous fault of the sheath grounding current, taking into account the reliability performance and low power consumption performance of the device. Among them, the preset fault condition is specifically that the target current is greater than the preset current threshold. During the intermittent sleep of the device, the current can still be monitored in real time, which does not affect the capture of instantaneous alarm events.

[0048] In the present invention, the circulating current state of the cable sheath can be monitored, which greatly reduces manual monitoring and improves work efficiency. At the same time, through the integrated design of hardware and software, the average power consumption of the device is controlled at the uA level. When powered only by the internal battery, it does not affect the capture of instantaneous alarm information. Theoretically, the service life of the device can exceed 10 years, ensuring the reliability of the equipment in the absence of external power supply, making the device suitable for different application scenarios.

[0049] In a specific embodiment, the power supply module also includes a rectifier and voltage stabilizing circuit module; the internal battery module and the power supply component are respectively connected to the input end of the rectifier and voltage stabilizing circuit module; the processor is provided with a power interface, and the processor is connected to the output end of the rectifier and voltage stabilizing circuit module through the power interface.

[0050] It should be noted that by converting electrical energy from different sources into a standard voltage suitable for use by the processor through the rectification and voltage stabilization circuit module, voltage fluctuations caused by power switching can be avoided to protect various components of the device from damage, thereby improving the stability of the device's operation.

[0051] In a specific embodiment, the acquisition module includes a data acquisition component and a sampling signal processing circuit unit connected in sequence; the data acquisition component is installed around the cable sheath to collect the ground loop current of the cable sheath; the sampling signal processing circuit unit is used to receive the ground loop current and integrate and amplify it to generate a target current of the cable sheath.

[0052] It can be understood that installing the data acquisition component around the cable sheath can quickly respond to the collection of ground loop current information of the cable sheath and improve the accuracy of information collection; at the same time, the ground loop current is integrated and amplified in combination with the sampling signal processing circuit unit, which effectively enhances the information components related to the ground loop current and filters out signal interference, thereby generating the target current and improving the working efficiency of the device.

[0053] In a specific embodiment, in order to improve the processing efficiency and flexibility of the device, the sampling signal processing circuit unit is connected to the processor and the programmable hardware module respectively, and is used to send the target current of the cable sheath to the processor and the programmable hardware module respectively.

[0054] In a specific embodiment, it also includes: a communication module; the processor is provided with a communication interface, and the processor is connected to the communication module through the communication interface;

[0055] The processor is also used to, when a sleep signal is received, upload the cable sheath monitoring data to the communication module according to a preset first sending frequency; when a wake-up signal is received, upload the cable sheath monitoring data to the communication module according to a preset second sending frequency; when a wake-up signal is received, send an alarm signal to the communication module; wherein the preset second sending frequency is greater than the preset first sending frequency.

[0056] It should be noted that in sleep mode, the processor uploads the cable sheath monitoring data at a lower transmission frequency to maintain the low power consumption performance requirements of the device. At the same time, even in sleep mode, the processor still ensures the regular upload of key data to ensure that if there is a data mutation or failure during sleep, it can be captured and analyzed in time; compared with sleep mode, the processor in wake-up working mode is no longer limited by low power consumption requirements, and the reporting frequency and density of cable sheath monitoring data are increased to improve the curve accuracy of the cable sheath monitoring data and provide real-time feedback on the circulation status of the cable sheath. In addition, the alarm signal is not affected by sleep mode or wake-up working mode. When the processor receives the alarm signal, it uploads the alarm signal to the remote master station in real time to remind the operation and maintenance personnel.

[0057] It is understandable that each component of this device should be made of waterproof materials to adapt to different installation environments, such as in a tunnel or in a joint well; at the same time, the device should also be integrated with a positioning function so that when a fault occurs later, the operation and maintenance personnel can quickly find the joint location for maintenance.

[0058] In a specific embodiment, the power supply component supports any power supply mode of power supply by mutual induction, power supply by solar energy and power supply by external direct current power supply.

[0059] It should be noted that most cable sheath grounding points are affected by the environment, and it is not convenient to obtain electricity. A single external power supply method often cannot meet the demand. In response to this situation, the present invention designs a power management circuit to achieve flexible power supply. The circuit can easily integrate power supply methods such as transformer power supply, solar cell, external DC power supply (DC12V / 24V external power supply), and select different external power supplies according to actual conditions to ensure working stability.

[0060] During installation, the power taking component can be connected to the grounding wire with larger current on site. The power taking component and the data acquisition component should be 10 cm apart. If no suitable location is found on site to install the power taking transformer, the power taking transformer can be selected without installing the power taking transformer.

[0061] In a specific embodiment, the data acquisition component is composed of a plurality of Rogowski coils; and the communication module is specifically a suction cup antenna.

[0062] It should be noted that the use of Rogowski coils as sampling sensors can effectively improve the measurement range and frequency response of current, while having good insulation performance. In the present invention, 4 or 7 Rogowski coils can be selected according to the actual application scenario.

[0063] Among them, the four Rogowski coils can respectively collect the ABC phase grounding current and the parallel grounding current of the cable sheath. Specifically, the four Rogowski coils can be divided into yellow (A), green (B), red (C), and blue (N) according to their colors, and are used to measure the four-phase currents of A, B, C, and N. When installing the Rogowski coil, you need to pay attention to the current flow direction. The relationship between the current flow direction and the installation of the Rogowski coil is as follows: Figure 3 As shown. The 7 Rogowski coils are used for a double grounding point shared grounding box, which is equivalent to two sets of ABC plus a grounding wire, and can also be used for a cross-connection box.

[0064] In particular, the suction cup antenna should be installed away from corners or places with many surrounding obstructions; it is understandable that if the signal in the installation environment has incomplete coverage, you can use an antenna extension cable or a communication relay to flexibly replace the communication module, so as to solve the signal coverage problem according to local conditions. At the same time, the suction cup antenna supports wireless or wired data access, and can use 4G communication or NBIoT communication methods in wireless communication.

[0065] During installation, it is necessary to first confirm whether the network installed on site is normal, and select the installation position of the suction cup antenna, and then determine the installation position of the terminal body of the cable sheath circulation online monitoring system composed of the power supply module, acquisition module, programmable hardware module and processor. The terminal body can be fixed directly on the wall with expansion screws, or it can be fixed on the pole on site with a clamp + cross arm; among them, the fixing position of the terminal body should take into account the position of the suction cup antenna and the installation position of the Rogowski coil. It should be noted that after the installation is completed, the device ID (located on the shell label of the terminal body) and the corresponding installation location information should be copied to make a terminal ledger.

[0066] See also Figure 3 , the second aspect of the present application provides a cable sheath circulating current online monitoring system, including a monitoring system and a cable sheath circulating current online monitoring device;

[0067] The monitoring system includes an intranet monitoring system and an extranet monitoring system. When the intranet monitoring system communicates normally, the cable sheath circulating current online monitoring device exchanges information with the intranet monitoring system through the power-specific APN card. Otherwise, the cable sheath circulating current online monitoring device exchanges information with the extranet monitoring system through the extranet cloud master station and WeChat applet.

[0068] In the present invention, in order to meet the needs of diverse application scenarios, a monitoring system that flexibly adapts to different network environments is designed to achieve efficient, compliant and secure access to field data under both intranet and extranet conditions through intelligent and secure design.

[0069] It is understandable that in the application scenario where there is already an intranet monitoring system, the field data can be connected to the existing intranet system of the power company through the power-specific APN card to achieve real-time data analysis and management. The field data includes cable sheath monitoring data and alarm signals.

[0070] In addition, in the scenario where there is no intranet application to connect to the field data, the external network cloud main station + WeChat applet can be used as a temporary information interaction solution; specifically, the field data is securely connected to the external network cloud main station, and users can use the WeChat applet to view the field conditions in real time and obtain alarm signal push. It is understandable that in order to ensure the security of the data, the cable sheath circulation online monitoring device will not upload the cable sheath monitoring data to the external network monitoring system. At the same time, the user password and multi-level permissions are used to effectively manage the use rights of different users, and data encryption, text graphic processing and other methods are used to avoid application data capture, thereby improving the security of the external network monitoring system and the confidentiality of data.

[0071] See also Figure 4 The third aspect of the present application provides a method for online monitoring of cable sheath circulating current, comprising:

[0072] Step 401, obtaining the target current of the cable sheath through a collection module.

[0073] In this step, the circulating current status information of the cable sheath is collected by the collection module and processed into the target current required by the programmable hardware module and the processor to ensure the integrity and accuracy of data collection.

[0074] Step 402 : monitor in real time through a programmable hardware module whether the target current meets a preset fault condition, and generate a trigger signal if it does.

[0075] It should be noted that the programmable hardware module is used to determine whether the real-time target current meets the preset fault condition, and if so, a trigger signal is generated; wherein, the judgment process of whether the preset fault condition is met can be to determine whether the target current is greater than the preset current threshold, so as to capture the current mutation, determine whether a fault occurs, and improve the immediacy of fault monitoring.

[0076] Step 403: Send a sleep signal or a wake-up signal through the power supply module.

[0077] It should be noted that the power supply mode includes an internal battery module and a power supply component. When the internal battery module is powered, a sleep signal is sent to the processor to put the processor in a low power consumption mode; when the power supply component is powered, a wake-up signal is sent to the processor.

[0078] Step 404, when the processor receives a sleep signal, it receives and processes the target current at intervals to generate cable sheath monitoring data; when it receives a wake-up signal, it receives and processes the target current in real time to generate cable sheath monitoring data; when it receives a trigger signal, it generates an alarm signal.

[0079] More specifically, when the processor receives a sleep signal, it receives and processes the target current at intervals, generates and uploads the cable sheath monitoring data at a first transmission frequency; when it receives a wake-up signal, it receives and processes the target current in real time, generates and uploads the cable sheath monitoring data at a preset second transmission frequency; and when it receives a trigger signal, it generates an alarm signal.

[0080] In sleep mode, the processor receives target current data at a preset lower frequency interval and performs necessary data processing and storage, but reduces the frequency of immediate processing and reporting to save energy; in wake-up working mode, the processor processes all received target current data in real time, generates high-density cable sheath monitoring data, enhances the real-time and accuracy of the data, and facilitates rapid response and analysis.

[0081] When receiving a trigger signal, the processor immediately generates an alarm signal, which facilitates the operation and maintenance personnel to conduct detection and adjustment to further analyze the problem, or perform automated isolation of the fault area, etc., to prevent the accident from expanding and ensure the safe and stable operation of the cable system.

[0082] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. 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 embodiments of the present invention.

Claims

1. A cable sheath circulating current online monitoring device, characterized in that: include: Power supply module, acquisition module, programmable hardware module and processor; The power supply module is connected to the processor; The power supply module includes an internal battery module and a power taking component, which is used to provide power to the processor and send a sleep signal or a wake-up signal to the processor; The acquisition module is used to obtain the target current of the cable sheath; the acquisition module is connected to the programmable hardware module and the processor respectively; The programmable hardware module is connected to the processor and is used to monitor in real time whether the target current meets the preset fault condition, and if so, generates a trigger signal and sends it to the processor; The processor is used to, when receiving a sleep signal, receive and process the target current at intervals to generate cable sheath monitoring data; when receiving a wake-up signal, receive and process the target current in real time to generate cable sheath monitoring data; When a trigger signal is received, an alarm signal is generated.

2. The cable sheath circulating current online monitoring device according to claim 1 is characterized in that: The power supply module also includes a rectifier and voltage regulator circuit module; the internal battery module and the power taking component are respectively connected to the input end of the rectifier and voltage regulator circuit module; The processor is provided with a power interface, and the processor is connected to the output end of the rectifying and voltage-stabilizing circuit module through the power interface.

3. The cable sheath circulating current online monitoring device according to claim 1 is characterized in that: The acquisition module includes a data acquisition component and a sampling signal processing circuit unit connected in sequence; The data acquisition component is installed around the cable sheath and is used to collect the grounding loop current of the cable sheath; The sampling signal processing circuit unit is used to receive the ground loop current and perform integration and amplification processing to generate a target current for the cable sheath.

4. The cable sheath circulating current online monitoring device according to claim 3 is characterized in that: The sampling signal processing circuit unit is connected to the processor and the programmable hardware module respectively, and is used to send the target current of the cable sheath to the processor and the programmable hardware module respectively.

5. The cable sheath circulating current online monitoring device according to claim 1 is characterized in that: Also includes: Communication module; The processor is provided with a communication interface, and the processor is connected to the communication module via the communication interface; The processor is also used to, when a sleep signal is received, upload the cable sheath monitoring data to the communication module according to a preset first sending frequency; when a wake-up signal is received, upload the cable sheath monitoring data to the communication module according to a preset second sending frequency; when a wake-up signal is received, send an alarm signal to the communication module; wherein the preset second sending frequency is greater than the preset first sending frequency.

6. The cable sheath circulating current online monitoring device according to claim 1, characterized in that: The power supply component supports any power supply mode of power supply by mutual induction, solar power supply and external direct current power supply.

7. The cable sheath circulating current online monitoring device according to claim 1 is characterized in that: The data acquisition component is composed of a plurality of Rogowski coils.

8. According to the cable sheath circulating current online monitoring device of claim 5, the communication module is specifically a suction cup antenna.

9. A cable sheath circulation online monitoring system, characterized in that: It comprises a monitoring system and the cable sheath circulating current online monitoring device according to any one of claims 1 to 8; The monitoring system includes an intranet monitoring system and an extranet monitoring system, which is used to exchange information between the cable sheath circulating current online monitoring device and the intranet monitoring system through the power-specific APN card when the intranet monitoring system communicates normally; conversely, the cable sheath circulating current online monitoring device and the extranet monitoring system are exchanged through the extranet cloud master station and WeChat applet.

10. A cable sheath circulating current online monitoring method, characterized in that: include: Obtain the target current of the cable sheath through the acquisition module; Monitor in real time through a programmable hardware module whether the target current meets a preset fault condition, and generate a trigger signal if the condition is met; Send a sleep signal or a wake-up signal through the power supply module; When the processor receives a sleep signal, it receives and processes the target current at intervals to generate cable sheath monitoring data; when it receives a wake-up signal, it receives and processes the target current in real time to generate cable sheath monitoring data; When a trigger signal is received, an alarm signal is generated.

Images