A line leakage monitoring system

Abstract

The application belongs to the technical field of power safety monitoring, and relates to a line leakage monitoring system. The line leakage monitoring system comprises a detection module, a data processing module, a control module and an alarm module. The detection module comprises a non-contact magnetic sensing collection device to induct a magnetic field generated by energization of a line to be measured and output an analog electric signal. The data processing module is connected with the detection module, is used to receive the analog electric signal, and processes the analog electric signal to obtain leakage current data. The control module is connected with the data processing module and the alarm module, receives the leakage current data, compares the leakage current data with a preset threshold value to identify a leakage fault, and generates a leakage fault signal. The alarm module is connected with the control module to receive the leakage fault signal and perform an alarm response. The application can realize non-contact real-time monitoring of line leakage, low-power operation and remote fault early warning without line dissection and wiring, has a wide application range and high monitoring reliability.

Description

Technical Field

[0001] This application relates to the field of power safety monitoring technology, specifically to a line leakage monitoring system. Background Technology

[0002] During long-term operation, low-voltage power distribution lines are prone to insulation degradation due to factors such as insulation aging, mechanical damage, moisture corrosion, and environmental interference. This can lead to leakage faults and pose safety hazards such as electric shock, fire, and equipment damage. Currently, the monitoring of line leakage mainly relies on a traditional method combining residual current devices (RCDs) and manual inspections, which is insufficient to meet the needs of intelligent, all-weather, and non-intrusive safety operation and maintenance.

[0003] Traditional residual current devices (RCDs) only cut off power when the leakage current reaches the trip threshold, failing to provide early warning and trend monitoring of leakage current. They also lack fault location capabilities, requiring segment-by-segment inspection for troubleshooting, resulting in low maintenance efficiency. Manual inspections are time-consuming and lack real-time accuracy, failing to promptly detect sudden leakage hazards and having limited applicability in complex wiring scenarios. Contact-type detection equipment requires disconnecting the wiring for installation, compromising pipe sealing, making deployment inconvenient, and posing safety risks.

[0004] Existing distributed leakage current monitoring systems mostly adopt wired communication and external power supply modes, which are complex in wiring and high in deployment costs, making them difficult to promote in the renovation of old lines, in situations without power supply, and in complex electromagnetic environments. At the same time, conventional monitoring equipment has weak anti-interference capabilities, is prone to false alarms and missed alarms, and lacks online self-testing and low-power operation mechanisms, resulting in short battery life, high maintenance costs, and an inability to achieve long-term stable remote online monitoring and intelligent early warning. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a line leakage current monitoring system. This application adopts a non-contact magnetic field induction acquisition method, which does not require cutting the cable under test or damaging the original wiring structure. It is easy to install and deploy, and does not affect the normal power supply operation of the line. With the help of signal filtering processing, the detection accuracy is improved. Combined with low power consumption operation, online self-test and hierarchical alarm mechanism, the monitoring reliability is high, and it can realize real-time early warning of leakage current hazards, reducing power safety risks and operation and maintenance costs.

[0006] On the one hand, this application provides a line leakage current monitoring system, characterized in that it includes a detection module, a data processing module, a control module and an alarm module;

[0007] The detection module includes a non-contact magnetic sensing acquisition device, which is used to sense the magnetic field generated by the circuit under test when it is energized, and output an analog electrical signal.

[0008] The data processing module is connected to the detection module and is used to receive the analog electrical signal and process the analog electrical signal to obtain leakage current data.

[0009] The control module is connected to the data processing module and the alarm module. The control module receives the leakage current data and compares it with a preset threshold to identify leakage faults and generate leakage fault signals.

[0010] The alarm module is connected to the control module to receive the leakage fault signal and respond to the alarm.

[0011] In an optional embodiment, the control module is connected to the detection module to control the detection module to perform intermittent testing.

[0012] In an optional embodiment, when there is no leakage, the intermittent test is set to once every five minutes; when there is a leakage, the intermittent test is set to once per second.

[0013] In an optional embodiment, the data processing module performs filtering and noise reduction, amplification and conditioning, analog-to-digital conversion, and data calculation on the analog electrical signal. The data calculation is performed by calculating the leakage current data using the following formula:

[0014]

[0015] Where I represents the leakage current data, and V t V0 is the test voltage, V0 is the reference voltage, and S is the sensitivity of the non-contact magnetic sensing acquisition device. The test voltage V0 is... t The reference voltage V0 is the voltage value obtained by the data processing module after filtering, noise reduction, amplification, conditioning, and analog-to-digital conversion of the analog electrical signal when there is leakage.

[0016] In an optional embodiment, the preset threshold includes a first threshold and a second threshold, the alarm response includes a first-level alarm and a second-level alarm, the control module controls the alarm module to activate the first-level alarm when it determines that the leakage current data falls within the first threshold range, and the control module controls the alarm module to activate the second-level alarm when it determines that the leakage current data falls within the second threshold range and the leakage duration exceeds a first preset time.

[0017] In an optional embodiment, the control module takes the average of multiple consecutive leakage current data, and controls the alarm module to activate the first-level alarm when it determines that multiple consecutive average values ​​fall within the first threshold range; and controls the alarm module to activate the second-level alarm when it determines that multiple consecutive average values ​​fall within the second threshold range and the leakage duration exceeds the first preset time.

[0018] In an optional embodiment, the first threshold range is greater than 30 mA, and the second threshold range is from 10 mA to 30 mA.

[0019] In an optional embodiment, the line leakage monitoring system further includes a transmission module and a cloud platform. The transmission module is connected to the control module and the cloud platform. The transmission module receives data packets from the control module and uploads the data packets to the cloud platform. The cloud platform constructs a time-series database to store the data packets.

[0020] In an optional embodiment, the data packet includes a first data group and a second data group. The control module transmits the first data group to the cloud platform once every second preset time through the transmission module, and transmits the second data group to the cloud platform through the transmission module when there is a leakage.

[0021] In an optional embodiment, the cloud platform is equipped with a system fault alarm and a leakage current fault alarm. When the cloud platform does not receive the first data group for more than the second preset time, the system fault alarm is triggered. When the cloud platform receives the second data group, the leakage current fault alarm is triggered.

[0022] As described above, compared with the prior art, the line leakage monitoring system provided in this application has at least the following beneficial effects:

[0023] The line leakage current monitoring system provided in this application uses a non-contact magnetic induction method to collect line current signals, eliminating the need for wire cutting and making installation convenient and adaptable to various low-voltage power distribution line scenarios. By filtering, reducing noise, amplifying, conditioning, and performing analog-to-digital conversion on the analog electrical signals, it effectively suppresses electromagnetic interference, improves leakage current detection accuracy, and reduces false alarms and missed alarms. It adopts an intermittent test sleep low-power mode, combined with periodic data packets to achieve online self-testing, extending the device's battery life and facilitating background status monitoring. At the same time, it presets multiple leakage thresholds to link local and remote alarms, enabling timely detection of leakage hazards and improving the intelligence of power distribution line safety monitoring and operation and maintenance efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 The diagram shown is a schematic diagram illustrating the working principle of a line leakage current monitoring system provided in an embodiment of this application. Detailed Implementation

[0026] To make the technical objectives, technical solutions, and technical effects of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, for example, referring to both fixed connections and detachable connections. Furthermore, the descriptions using terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an implementation or example is included in at least one implementation or example of this application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more implementations or examples.

[0030] To address the problems of complex wiring, poor positioning ability, poor real-time performance, and low maintenance efficiency in the existing technologies mentioned above, this application provides a line leakage current monitoring system. This application adopts a non-contact magnetic field induction acquisition method, which does not require cutting the cable under test or damaging the original wiring structure. It is easy to install and deploy, and does not affect the normal power supply operation of the line. With signal filtering processing, the detection accuracy is improved. Combined with low power consumption operation, online self-testing, and hierarchical alarm mechanism, the monitoring reliability is high, and it can realize real-time early warning of leakage current hazards, reducing power safety risks and operation and maintenance costs.

[0031] Reference Figure 1 The line leakage current monitoring system provided in this embodiment includes a detection module, a data processing module, a control module and an alarm module;

[0032] The detection module includes a non-contact magnetic sensing acquisition device, which is used to sense the magnetic field generated by the circuit under test when it is energized, and outputs an analog electrical signal;

[0033] The data processing module is connected to the detection module and is used to receive analog electrical signals and process them to obtain leakage current data.

[0034] The control module is connected to the data processing module and the alarm module. The control module receives leakage current data and compares it with a preset threshold to identify leakage faults and generate leakage fault signals.

[0035] The alarm module is connected to the control module to receive leakage fault signals and respond to alarms.

[0036] In practical applications, the non-contact magnetic field induction acquisition method is adopted, which does not require cutting the line under test or damaging the wiring structure. It is convenient to deploy and does not affect the normal operation of the line. It is suitable for various low-voltage power distribution line scenarios, and its application scope is greatly expanded.

[0037] In this embodiment, the detection module includes a non-contact magnetic sensing acquisition device, which is used to sense the magnetic field generated by the energized circuit under test and output an analog electrical signal. The number and layout of the non-contact magnetic sensing acquisition device can be specially set according to the actual situation such as the number of circuits, the length of the circuit, and safety risks, and are not specifically limited here.

[0038] The non-contact magnetic sensing acquisition device can be any of the following: Hall sensor element, magnetoresistive sensor chip, zero-sequence current transformer, Rogowski coil or other suitable device. Preferably, the non-contact magnetic sensing acquisition device is an open-loop Hall current sensor. This sensor is small in size, low in power consumption, high in detection accuracy, and strong in anti-interference ability. It adopts a non-contact magnetic field induction acquisition method, which does not require cutting the cable under test or damaging the wiring structure. It is convenient to deploy and does not affect the normal operation of the line.

[0039] In this embodiment, the data processing module is connected to the detection module and is used to receive analog electrical signals and process the analog electrical signals to obtain leakage current data. The data processing module's processing of the analog electrical signals includes filtering and noise reduction, amplification and conditioning, analog-to-digital conversion, and data calculation.

[0040] Filtering and noise reduction equipment is used to filter out high-frequency interference and unwanted noise in analog electrical signals, smooth signal waveforms, purify effective power frequency signals, improve the accuracy of weak current signal acquisition and conversion, and ensure the accuracy of leakage current data and the long-term monitoring stability of the system. The filtering and noise reduction equipment can employ any of the following: RC filter circuit, LC filter circuit, or other suitable filtering and noise reduction devices to perform filtering and noise reduction processing on analog electrical signals. Preferably, an RC low-pass filter is used, as it has a simple structure, low cost, requires no additional power supply, does not increase system power consumption, and is suitable for the system's low-power intermittent testing mode.

[0041] Signal amplification devices are used to amplify and differentially condition weak analog electrical signals after filtering and noise reduction, improving signal driving capability and sampling resolution. This facilitates accurate acquisition during subsequent analog-to-digital conversion, effectively reducing detection errors and preventing false alarms and missed alarms in leakage current monitoring. Signal amplification devices can be operational amplifiers, instrumentation amplifiers, or other suitable signal amplification devices. Preferably, operational amplifiers are used because they are inexpensive, offer a wide range of options, provide flexible circuit design, allow for adjustable amplification factors, and have good compatibility with RC low-pass filters and analog-to-digital conversion circuits.

[0042] Analog-to-digital converters (ADCs) are used to convert filtered, noise-reduced, amplified, and conditioned analog electrical signals into digital signals, facilitating subsequent calculations to determine leakage current data. The ADC can be any of a microcontroller with a built-in ADC, a standalone ADC chip, or other suitable ADC devices. Preferably, the ADC uses a microcontroller with a built-in ADC, which simplifies the hardware structure, reduces costs, and balances low power consumption and battery life requirements while maintaining leakage current detection accuracy.

[0043] In this embodiment, the leakage current data is calculated using the following formula:

[0044]

[0045] Where I represents the leakage current data, and V t V0 is the test voltage, V0 is the reference voltage, and S is the sensitivity of the non-contact magnetic sensing acquisition device. t The voltage value is obtained by the data processing module after filtering, noise reduction, amplification, conditioning, and analog-to-digital conversion of the analog electrical signal when there is leakage. The reference voltage V0 is the voltage value obtained by the data processing module after filtering, noise reduction, amplification, conditioning, and analog-to-digital conversion of the analog electrical signal when there is no leakage. For example, if the test voltage V t Compared to the reference voltage V0, which has a deviation of 0.1V, the sensitivity of the non-contact magnetic sensing acquisition device is 0.185V / A. Therefore, the leakage current data I = 0.1 / 0.185 = 0.54A = 540mA.

[0046] In this embodiment, a preset threshold needs to be set in the control module before the actual test. The control module receives the leakage current data obtained after processing by the data processing module and compares it with the preset threshold to identify leakage faults and generate leakage fault signals. The preset thresholds include a first threshold and a second threshold, and the alarm response includes a first-level alarm and a second-level alarm.

[0047] In practical applications, the control module can be set to activate a first-level alarm when it determines that the leakage current data falls within the first threshold range, and to activate a second-level alarm when it determines that the leakage current data falls within the second threshold range and the leakage duration exceeds the first preset time.

[0048] In this embodiment, in order to suppress the single sampling jump caused by instantaneous electromagnetic interference and pulse noise, and to prevent false alarms caused by instantaneous interference and short-term signal fluctuations, this application adopts a continuous test and average value operation mode. That is, the control module takes multiple consecutive leakage current data to calculate the average value, and when it is determined that multiple consecutive average values ​​fall within the first threshold range, the control alarm module starts a level one alarm. When it is determined that multiple consecutive average values ​​fall within the second threshold range and the leakage duration exceeds the first preset time, the control alarm module starts a level two alarm.

[0049] The number of leakage current data points used for averaging and the number of consecutive average values ​​falling within a preset threshold range can be set according to actual conditions and needs, and are not specifically limited here. For example, the control module can take 10 consecutive leakage current data points, calculate the average, and if three consecutive average values ​​fall within the first threshold range, the control alarm module can activate a level one alarm; if three consecutive average values ​​fall within the second threshold range and the leakage duration exceeds a first preset time, the control alarm module can activate a level two alarm.

[0050] In this embodiment, to ensure personal safety and avoid the risk of electric shock, while preventing the leakage from escalating and causing line overheating, short circuits, or even electrical fires, a first threshold range of greater than 30 mA is set. 10 mA to 30 mA falls within the range of minor leakage in low-voltage power distribution, which has not yet reached the high-risk level for electric shock. Setting this range as a level two warning allows for early detection of potential hazards when the line insulation is just beginning to age and minor leakage current appears, enabling early fault discovery and troubleshooting, and preventing minor leakage from gradually worsening and escalating to a high-risk level of over 30 mA.

[0051] This embodiment distinguishes between minor hidden dangers and high-risk leakage current, without confusing alarm levels, and realizes hierarchical early warning. It will not cause false alarms due to weak and normal leakage current, and can promptly remind maintenance personnel to inspect and repair early problems such as line damage and insulation aging. It can reduce the risk of electric shock and electrical fire from the source and improve the precision of safe operation and maintenance of power distribution lines.

[0052] In this embodiment, the alarm module is only activated to trigger a secondary alarm when three consecutive average values ​​fall within the second threshold range and the leakage duration exceeds the first preset time. 10 mA to 30 mA falls within the range of minor leakage, where electromagnetic interference and instantaneous load fluctuations can easily cause temporary exceedances. The first preset time setting filters out accidental and temporary value exceedances, preventing false alarms caused by minor disturbances. The first preset time can be 3 minutes, 5 minutes, 10 minutes, or other suitable times. Specifically, it can be flexibly adjusted according to the actual application scenario. For example, the first preset time can be set to 3 to 5 minutes for ordinary civilian power distribution; for important industrial lines, the first preset time can be shortened to 2 to 3 minutes to achieve earlier warnings; and for old, complex, and interfering lines, the first preset time can be extended to 10 to 15 minutes to further prevent false alarms.

[0053] In this embodiment, the control module is connected to the detection module to control the detection module to perform intermittent testing. The duration of the intermittent testing can be set according to actual needs and is not specifically limited here. For example, it can be set that when there is no leakage, the control module performs a test on the line every 5 minutes; once an abnormal leakage current data is detected, the control module performs a test on the line every 1 second.

[0054] By adopting an intermittent testing timed sampling mode, there is no need for continuous high-frequency data acquisition, which can significantly reduce the static power consumption of the system, making it suitable for long-term battery-powered operation scenarios and effectively extending the system's battery life. At the same time, it can reduce the accumulation of temperature drift and electromagnetic interference caused by long-term circuit power-on, and improve the stability of detection.

[0055] In this embodiment, the line leakage monitoring system also includes a transmission module and a cloud platform. The transmission module is connected to the control system and the cloud platform. The transmission module receives data packets from the control module and uploads the data packets to the cloud platform. The cloud platform builds a time-series database to store the data packets.

[0056] In this embodiment, the transmission module can adopt any one of LoRa, NB-IoT, 4G, WiFi or other suitable communication methods. Preferably, the transmission module adopts LoRa wireless communication and its supporting gateway. LoRa spread spectrum communication has strong penetration and long transmission distance, and is suitable for complex obstructed deployment environments such as power distribution wells and corridors. It has extremely low standby power consumption and is suitable for low-power working modes such as battery power supply and intermittent testing.

[0057] This embodiment employs a multi-channel LoRa gateway, which integrates multiple independent radio frequency receiving channels, enabling simultaneous reception of data uploaded by multiple LoRa terminal nodes. Different terminals occupy different channels, preventing interference. This design can simultaneously accommodate a large number of leakage current monitoring systems in an online network, meeting the needs of large-scale centralized monitoring. Parallel reception across multiple channels and isolation of different monitoring signals prevent co-channel interference and data transmission / reception conflicts, resulting in high communication stability and a high reporting success rate. Furthermore, a single gateway can cover a large area, eliminating the need for frequent gateway additions and reducing networking hardware and construction costs.

[0058] In this embodiment, a power supply module is also provided. The power supply module is electrically connected to the detection module, data processing module, control module, alarm module and transmission module respectively, so as to provide working voltage for each functional module in a unified manner, so as to realize low power consumption monitoring and normal monitoring communication of the system.

[0059] The power supply module can be any one of a battery, a mains rectified power supply, a DC switching power supply, a solar power supply device, or other suitable power supply devices. Preferably, the power supply module is a battery. Battery power supply eliminates the need for power lines and AC power connection, making installation and deployment simple and quick. At the same time, battery power supply provides electrical isolation, avoiding safety hazards and power frequency electromagnetic interference caused by high-voltage power connection, which helps improve the accuracy of weak sensor signal acquisition. Furthermore, the equipment can still monitor normally when the mains power is interrupted, ensuring that leakage detection and alarm functions are not interrupted. Combined with the system's low-power intermittent testing mode, it can achieve long-term maintenance-free operation, resulting in better engineering practicality and operation and maintenance economy.

[0060] In this embodiment, the data packet includes a first data group and a second data group. The control system transmits the first data group to the cloud platform through the transmission module every second preset time interval, and transmits the second data group to the transmission module when there is a leakage current. The cloud platform is equipped with a system fault alarm and a leakage current fault alarm. When the cloud platform does not receive the first data group for more than the second preset time, it triggers the system fault alarm; when the cloud platform receives the second data group, it triggers the leakage current fault alarm.

[0061] In this embodiment, the first data set includes information such as the power supply module battery level, the deployment location and time of the non-contact magnetic sensing acquisition device, detection data, and system operating status. The second preset time can be set according to actual needs. For example, the second preset time can be 3 hours, 6 hours, 15 hours, 24 hours, or other suitable durations. Preferably, the second preset time can be set to 24 hours to periodically report information such as the system online status, in order to determine whether each functional module is online normally. If the first data set is not received after the second preset time, the device can be identified in a timely manner as offline, power outage, or communication failure, and a system fault alarm can be triggered on the cloud platform, thereby realizing proactive monitoring of the device status.

[0062] The second data set includes information such as the deployment location of the non-contact magnetic sensing acquisition device, leakage current data, and the battery level of the power supply module. Once the cloud platform receives the second data set, it indicates a leakage fault in the circuit and triggers a leakage fault alarm on the cloud platform. In an optional embodiment, the leakage fault alarm on the cloud platform can be divided into a first-level leakage fault alarm and a second-level leakage fault alarm. For example, if the average value of 10 consecutive leakage current data is greater than 30 mA, a first-level fault alarm is triggered on the cloud platform; if the average value of 10 consecutive leakage current data is greater than 10 mA and less than 30 mA, and the leakage duration exceeds 5 minutes, a second-level leakage fault alarm is triggered on the cloud platform.

[0063] Both the first and second data sets are stored in the time-series database on the cloud platform. The time-series database can save daily and hourly leakage detection time-series data, hierarchical alarm records, and system online records for a long time. This makes it easy to generate leakage trend charts, intuitively judge the gradual process of line hazards, and realize the shift from post-event alarm to pre-event prediction.

[0064] In this embodiment, the cloud platform is equipped with multi-channel alarm links. For example, a mobile phone number or APP account can be bound to the cloud. The cloud can send SMS alarms to the bound mobile phone number or push alarm information to the bound APP, thereby ensuring that no alarm is missed and the response is more timely, which greatly improves the efficiency of operation and maintenance of power distribution leakage hazards.

[0065] The above description is only a partial preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A line leakage current monitoring system, characterized in that, It includes a detection module, a data processing module, a control module, and an alarm module; The detection module includes a non-contact magnetic sensing acquisition device, which is used to sense the magnetic field generated by the circuit under test when it is energized, and output an analog electrical signal. The data processing module is connected to the detection module and is used to receive the analog electrical signal and process the analog electrical signal to obtain leakage current data. The control module is connected to the data processing module and the alarm module. The control module receives the leakage current data and compares it with a preset threshold to identify leakage faults and generate leakage fault signals. The alarm module is connected to the control module to receive the leakage fault signal and respond to the alarm.

2. The line leakage current monitoring system according to claim 1, characterized in that, The control module is connected to the detection module to control the detection module to perform intermittent testing.

3. The line leakage monitoring system according to claim 2, characterized in that, When there is no leakage, the intermittent test is set to once every five minutes; when there is leakage, the intermittent test is set to once per second.

4. The line leakage current monitoring system according to claim 1, characterized in that, The data processing module performs filtering and noise reduction, amplification and conditioning, analog-to-digital conversion, and data calculation on the analog electrical signal. The data calculation is performed using the following formula to calculate the leakage current data: Where I represents the leakage current data, and V t V0 is the test voltage, V0 is the reference voltage, and S is the sensitivity of the non-contact magnetic sensing acquisition device. The test voltage V0 is... t The reference voltage V0 is the voltage value obtained by the data processing module after filtering, noise reduction, amplification, conditioning, and analog-to-digital conversion of the analog electrical signal when there is leakage.

5. The line leakage current monitoring system according to claim 1, characterized in that, The preset thresholds include a first threshold and a second threshold. The alarm response includes a first-level alarm and a second-level alarm. When the control module determines that the leakage current data falls within the first threshold range, it controls the alarm module to activate the first-level alarm. When the control module determines that the leakage current data falls within the second threshold range and the leakage duration exceeds a first preset time, it controls the alarm module to activate the second-level alarm.

6. The line leakage current monitoring system according to claim 5, characterized in that, The control module takes the average value of multiple consecutive leakage current data, and controls the alarm module to activate the first-level alarm when it determines that multiple consecutive average values ​​fall within the first threshold range. When it determines that multiple consecutive average values ​​fall within the second threshold range and the leakage duration exceeds the first preset time, it controls the alarm module to activate the second-level alarm.

7. The line leakage current monitoring system according to claim 5, characterized in that, The first threshold range is greater than 30 mA, and the second threshold range is from 10 mA to 30 mA.

8. The line leakage current monitoring system according to claim 1, characterized in that, The line leakage current monitoring system also includes a transmission module and a cloud platform. The transmission module is connected to the control module and the cloud platform. The transmission module receives data packets from the control module and uploads the data packets to the cloud platform. The cloud platform constructs a time-series database to store the data packets.

9. The line leakage current monitoring system according to claim 8, characterized in that, The data packet includes a first data group and a second data group. The control module transmits the first data group to the cloud platform once every second preset time through the transmission module, and transmits the second data group to the cloud platform through the transmission module when there is a leakage.

10. The line leakage current monitoring system according to claim 9, characterized in that, The cloud platform is equipped with system fault alarms and leakage fault alarms. When the cloud platform does not receive the first data group for more than the second preset time, the system fault alarm is triggered. When the cloud platform receives the second data group, the leakage fault alarm is triggered.

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