Coal mine underground cable wiring safety monitoring circuit and method

Abstract

The invention relates to a coal mine underground cable wiring safety monitoring circuit and method. The coal mine underground cable wiring safety monitoring circuit comprises a power input measurement module, a data acquisition module, a data processing module and a carrier communication module. The signal output end of the power input measurement module is connected with the signal input end of the data acquisition module, the signal output end of the data acquisition module is connected with the signal input end of the data processing module, and the wired communication data end of the data processing module is connected with the first communication data end of the carrier communication module. And the second communication data end of the carrier communication module is connected with the second communication data ends of other correspondingly associated carrier communication modules. The defects that a traditional underground power supply monitoring mode is difficult to accurately position an electric leakage area, data transmission is limited, and the monitoring coverage range is insufficient are overcome, and the safety and maintenance efficiency of a coal mine power supply system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of a coal mine underground cable connection safety monitoring circuit, and in particular to a coal mine underground cable connection safety monitoring circuit and method. Background Art

[0002] At present, the power supply system in coal mines usually adopts 1140V three-phase three-wire center point ungrounded power supply mode, which is widely used in coal mines to meet the power needs of various equipment. However, due to the complex underground environment, the power supply line often has the characteristics of long line length and many branches. Due to the limitation of cable drum length, a large number of flameproof cable junction boxes are usually required for connection and branching during cable laying to ensure the safety and stability of cable connection.

[0003] In underground environments, cables are exposed to high humidity and high dust for a long time, and may be subjected to mechanical shock or pulling, which may cause the insulation performance of the cables to gradually deteriorate, and even lead to the risk of leakage. Once leakage occurs, it may not only affect the normal power supply, but also cause safety accidents. Therefore, how to quickly and accurately detect the leakage of cables and accurately locate the leakage point has become the key to underground power supply safety management. Summary of the invention

[0004] In order to solve the problem that traditional leakage detection methods mainly rely on manual inspections or single-point monitoring, and it is difficult to accurately determine the leakage section in a complex power supply network, the present application provides a coal mine underground cable wiring safety monitoring circuit and method.

[0005] A coal mine underground cable wiring safety monitoring circuit is applied between multiple coal mine underground cable wiring safety monitoring boxes, the coal mine underground cable wiring safety monitoring box includes a box body, and a cable input interface and a cable output interface both connected to the box body, and the cable output interface is provided with a plurality of them, the coal mine underground cable wiring safety monitoring circuit includes a monitoring subcircuit correspondingly arranged in each of the boxes, and the monitoring subcircuit includes a power input measurement module, a data acquisition module, a data processing module and a carrier communication module; The main cable line is introduced into the box through the cable input interface and extends to different branch lines through multiple cable output interfaces. The power input measurement module is used to collect electrical parameters of the branch lines extending from each cable output interface, and the electrical parameters at least include leakage monitoring parameters, temperature monitoring parameters and current monitoring parameters; The signal output end of the power input measurement module is connected to the signal input end of the data acquisition module, the signal output end of the data acquisition module is connected to the signal input end of the data processing module, a wireless communication path is established between the data processing module and other correspondingly associated data processing modules, the wired communication data end of the data processing module is connected to the first communication data end of the carrier communication module, the second communication data end of the carrier communication module is connected to the second communication data end of other correspondingly associated carrier communication modules, and the third communication data end of the carrier communication module is connected to a host computer.

[0006] By adopting the above technical solution, a monitoring subcircuit is set inside each monitoring box, which integrates a power input measurement module, a data acquisition module, a data processing module and a carrier communication module to ensure real-time acquisition of electrical parameters and data interaction. The main cable line enters the monitoring box through the cable input interface and branches to different lines at multiple cable output interfaces, while the power input measurement module can collect leakage, current and temperature information of each branch line to ensure comprehensive monitoring of the operating status of the cable; during the data processing process, the signal of the power input measurement module is transmitted to the data acquisition module, and then further transmitted to the data processing module for calculation and analysis. In order to improve the accuracy of fault location, the monitoring circuit not only processes data inside a single monitoring box, but also establishes wireless communication paths between multiple monitoring boxes, so that the data processing modules in different boxes can exchange and compare electrical parameters with each other, so as to accurately identify leakage points or fault areas based on multi-point data comparison; in order to meet the communication needs of the underground environment of coal mines, the system adopts a communication method that combines wired and wireless. The wired communication data end of the data processing module passes through the carrier communication module, so that data can be transmitted between monitoring boxes and between the host computer through the power carrier, and the second communication data end of the carrier communication module is further connected to the carrier communication module of other monitoring boxes to achieve long-distance transmission and sharing of data, ensuring that fault information can be received and analyzed in real time by the remote monitoring center. In addition, the wireless communication path of the circuit can enhance the interaction between monitoring boxes and improve the redundancy and anti-interference ability of the system.

[0007] Preferably, the power input measurement module comprises a current mutual inductance unit, an insulation unit and a temperature sensing unit, all of which are connected to the signal input terminal of the data acquisition module; The current transformer unit includes three current transformers, each of which is used to measure the current monitoring parameter of each phase of the three-phase electricity; The insulation unit at least includes a zero-sequence current transformer, which is used to measure leakage monitoring parameters between three-phase electricity; The temperature sensing unit is used to measure the temperature monitoring parameter.

[0008] By adopting the above technical solutions, the power input measurement module can monitor key electrical parameters such as current, leakage and temperature respectively, and collect and process them in real time by integrating the current mutual inductance unit, insulation unit and temperature sensor unit. The comprehensive use of these monitoring parameters enables the system to respond sensitively to different fault conditions and provide reliable data support for subsequent fault diagnosis and decision-making. Through the effective collaboration of these modules, the health status of electrical equipment can be understood in real time, thereby improving the accuracy and timeliness of underground cable monitoring in coal mines.

[0009] Preferably, the monitoring subcircuit also includes a switching power supply control module, the power input end of the switching power supply control module is connected to the cable main line, and the power output end of the switching power supply control module outputs voltage to the data acquisition module and the carrier communication module for power supply.

[0010] By adopting the above technical solution, the switch power supply control module can ensure the stable power supply of the data acquisition module and the carrier communication module, and maintain the long-term operation stability of the system in the special environment of the coal mine. The safety and stability of the system are enhanced, and the monitoring interruption or equipment damage caused by unstable power supply is avoided.

[0011] Preferably, a power switch and a fuse module connected in series are provided between the power input end of the switching power supply control module and the main cable line.

[0012] By adopting the above technical solution, the common node between the fuse module and the carrier communication module is connected to the overvoltage signal acquisition terminal of the data acquisition module, so that the system can monitor the overvoltage condition of the power supply end in real time. Once an overvoltage event occurs, the system can collect overvoltage data in time and use it as a fault parameter for further processing. This design enables the circuit to automatically take protective measures in an overvoltage environment, reduce damage to electrical equipment, and further improve the reliability and safety of the system.

[0013] Preferably, the common node between the fuse module and the carrier module is connected to the overvoltage signal acquisition terminal of the data acquisition module for acquiring corresponding overvoltage monitoring parameters.

[0014] By adopting the above technical solution, the common node between the fuse module and the carrier communication module is connected to the overvoltage signal acquisition terminal of the data acquisition module, so that the system can monitor the overvoltage condition of the power supply end in real time. Once an overvoltage event occurs, the system can collect overvoltage data in time and use it as a fault parameter for further processing. This design enables the circuit to automatically take protective measures in an overvoltage environment, reduce damage to electrical equipment, and further improve the reliability and safety of the system.

[0015] A method for monitoring cable wiring safety in underground coal mines is applied to a circuit for monitoring cable wiring safety in underground coal mines. The method for monitoring cable wiring safety in underground coal mines comprises: If a power signal is detected, an initialization operation is performed to detect whether the initialization operation is successfully performed. If not, a corresponding warning operation is performed; If the execution is successful, the electrical parameters are obtained in real time to determine whether the electrical parameters exceed a preset electrical threshold value, and if the electrical parameters do not exceed the preset electrical threshold value, the determination is continued; If the preset electrical threshold is exceeded, the corresponding associated sub-circuit is determined, and a data communication request is sent to each of the associated sub-circuits respectively; receiving in real time a fault feedback parameter generated and sent by the associated sub-circuit based on the data communication request; The fault feedback parameters and the electrical parameters are analyzed to generate corresponding communication data, where the communication data is used to perform host computer communication operations and / or local display operations.

[0016] By adopting the above technical solutions, real-time monitoring and processing of electrical parameters can be achieved in the underground cable wiring system of coal mines. The power input measurement module can collect electrical parameters such as current, leakage and temperature in real time, while the data acquisition module and data processing module can effectively analyze and process these collected parameters to ensure that the system can identify and respond to faults in a timely manner. In addition, the design of the carrier communication module can realize remote transmission and processing of data, making the system's monitoring capabilities more intelligent, able to operate effectively in the underground environment of coal mines, and improving the safety and operational stability of coal mine cable wiring systems.

[0017] Preferably, in the step of determining whether the electrical parameter exceeds a preset electrical threshold, the preset electrical threshold includes a leakage threshold, an over-temperature threshold and an over-current threshold, including: Measuring a leakage monitoring parameter between three-phase electricity based on a zero-sequence current transformer, and determining whether the leakage monitoring parameter exceeds the leakage threshold; Based on the current monitoring parameters of each phase of the three-phase electricity measured by the three current transformers, determining whether the current monitoring parameters exceed the overcurrent threshold; Based on the temperature monitoring parameters measured by each temperature sensing element in the box, it is determined whether the temperature monitoring parameters exceed the over-temperature threshold.

[0018] By adopting the above technical solution, through accurate measurement based on zero-sequence current transformer, three current transformers and temperature sensor elements, it is possible to accurately identify leakage, overcurrent and overtemperature problems in the underground cable wiring system of coal mines. This solution can compare and analyze the leakage monitoring parameters, overcurrent monitoring parameters and temperature monitoring parameters collected in real time with the set thresholds, detect electrical anomalies in time, and avoid safety accidents caused by leakage, overcurrent or overtemperature. Through the implementation of this solution, the safety of the cable wiring system has been significantly improved, and it can respond quickly when an abnormality occurs, reducing potential safety hazards.

[0019] Preferably, in the step of determining the corresponding associated subcircuit, the associated subcircuit includes a leakage associated subcircuit, an overcurrent associated subcircuit and an overtemperature associated subcircuit, including: Determining a fault type corresponding to the electrical parameter; Determine the mapping relationship based on the fault type and determine the corresponding association rule; If the association rule is a leakage rule, then the adjacent monitoring subcircuits at the front and rear ends of the main cable are determined as leakage association subcircuits; If the association rule is an overcurrent rule, then adjacent monitoring subcircuits on the same power supply circuit are determined to be overcurrent associated subcircuits; If the association rule is an over-temperature rule, the monitoring sub-circuit closest to the monitoring sub-circuit is determined to be an over-temperature associated sub-circuit.

[0020] By adopting the above technical solution and setting the leakage, overcurrent and overtemperature association rules, the sub-circuit where the problem occurs can be accurately located according to different electrical fault types. These rules select the corresponding associated sub-circuit based on the fault type of the electrical parameters. Through this step, the system can take corresponding monitoring measures for different fault types to further improve the accuracy of fault diagnosis. For example, in the case of leakage fault, the adjacent monitoring sub-circuit before and after the main cable line is determined, the monitoring sub-circuit of the same power supply circuit is selected in the case of overcurrent fault, and the nearest monitoring sub-circuit is selected in the case of overtemperature fault, thereby effectively narrowing the scope of fault investigation and improving the efficiency of fault location.

[0021] Preferably, before the step of sending a data communication request to each of the associated sub-circuits respectively, the method further includes: Calculate the difference between each electrical parameter and the corresponding preset electrical threshold; Classify and aggregate the electrical parameters according to the fault type to generate a corresponding classification parameter set; Determine the weight coefficient corresponding to each of the classification parameter sets according to a preset order generation rule; Adding all the comparison differences corresponding to the electrical parameters contained in the classification parameter set to generate corresponding difference parameters, and taking the product of the difference parameters and the weight coefficient as the order determination parameter; According to the order determination parameter, a corresponding request sending order is determined, and the request sending order is used to determine the sending order of sending data communication requests to each of the associated sub-circuits.

[0022] By adopting the above technical solution, by calculating the comparison difference between the electrical parameters and the preset electrical threshold and generating a classification parameter set, the system can more scientifically weight the electrical parameters and finally determine the order in which the requests are sent. According to the preset order generation rules, the system generates order determination parameters by comparing the difference and the product of the weight coefficient, thereby optimizing the order of data communication. This design can reasonably arrange the processing priority when multiple faults occur at the same time, ensuring that the most urgent faults are handled first, thereby improving the response efficiency and fault handling speed of the underground cable wiring monitoring system in coal mines.

[0023] Preferably, in the step of analyzing the fault feedback parameters and the electrical parameters to generate corresponding communication data, the fault feedback parameters include leakage feedback parameters, current feedback parameters and temperature feedback parameters, including: According to the leakage parameter comparison result between the leakage feedback parameter and the leakage monitoring parameter, it is judged whether there is cable leakage, and if so, the corresponding leakage point is determined based on the leakage parameter comparison result; According to the current parameter comparison result between the current feedback parameter and the current monitoring parameter, judging whether there is a power supply abnormality, and if so, determining the corresponding abnormality type based on the current gradient difference corresponding to the current parameter comparison result; Determining a corresponding over-temperature region according to a temperature parameter comparison result between the temperature feedback parameter and the temperature monitoring parameter; Integrate and transform the leakage point, the abnormal type and / or the over-temperature area to generate corresponding protocol standardization data, and generate corresponding communication data according to the request sending order and the protocol standardization data.

[0024] By adopting the above technical solution, the fault feedback parameter analysis step can effectively judge the leakage, power supply anomaly and over-temperature area in the cable wiring system by comparing the leakage feedback parameters, current feedback parameters and temperature feedback parameters, and accurately locate the fault source. According to the leakage parameters, fault current gradient differences and temperature changes, the system can generate communication data according to the standardized protocol and perform host computer communication operations or local display operations, and upload the fault information to the monitoring system in time. This solution integrates the fault information of leakage points, abnormal types and over-temperature areas to generate a standardized data protocol to ensure the reliability and consistency of data during the communication process, thereby further improving the fault detection and response capabilities of the underground cable wiring system in coal mines and ensuring the safe operation of the entire power system.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application sets a monitoring subcircuit inside each monitoring box, which integrates a power input measurement module, a data acquisition module, a data processing module and a carrier communication module to ensure real-time acquisition of electrical parameters and data interaction. The main cable line enters the monitoring box through the cable input interface and branches to different lines at multiple cable output interfaces. The power input measurement module can collect leakage, current and temperature information of each branch line to ensure comprehensive monitoring of the operating status of the cable; 2. During the data processing, the signal of the power input measurement module is transmitted to the data acquisition module, and then further transmitted to the data processing module for calculation and analysis. In order to improve the accuracy of fault location, the monitoring circuit not only processes data within a single monitoring box, but also establishes a wireless communication path between multiple monitoring boxes, so that the data processing modules in different boxes can exchange and compare electrical parameters with each other, so as to accurately identify the leakage point or fault area based on multi-point data comparison; 3. In order to meet the communication needs of the underground environment of coal mines, the system adopts a communication method that combines wired and wireless communication. The wired communication data end of the data processing module passes through the carrier communication module, so that the data can be transmitted between the monitoring boxes and between the host computer through the power carrier, and the second communication data end of the carrier communication module is further connected to the carrier communication module of other monitoring boxes to achieve long-distance transmission and sharing of data, ensuring that fault information can be received and analyzed in real time by the remote monitoring center. In addition, the wireless communication path of the circuit can enhance the interaction between monitoring boxes and improve the redundancy and anti-interference ability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of a coal mine underground cable wiring safety monitoring circuit in one embodiment of the present application.

[0027] Figure 2This is a partial circuit diagram of a coal mine underground cable wiring safety monitoring circuit in one embodiment of the present application; Figure 3 This is a schematic diagram of the specific structure of a coal mine underground cable wiring safety monitoring box in one embodiment of the present application; Figure 4 This is a flow chart of a method for monitoring cable connection safety in underground coal mines in one embodiment of the present application; Figure 5 This is a flowchart for implementing step S20 in a coal mine underground cable wiring safety monitoring circuit in one embodiment of the present application; Figure 6 This is a flowchart for implementing step S30 in a coal mine underground cable wiring safety monitoring circuit in one embodiment of the present application; Figure 7 This is another implementation flow chart of step S30 in a coal mine underground cable wiring safety monitoring circuit in one embodiment of the present application; Figure 8 It is a flow chart for implementing step S50 in a coal mine underground cable wiring safety monitoring circuit in one embodiment of the present application.

[0028] Explanation of the reference numerals: 100, housing; 200, cable input interface; 300, cable output interface; 1, power input measurement module; 11, current mutual inductance unit; 12, insulation unit; 13, temperature sensing unit; 2, data acquisition module; 3, data processing module; 4, carrier communication module; 5, switching power supply control module; 6, power switch; 7, fuse module. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings.

[0030] In one embodiment, if Figure 1 As shown, the present application discloses a coal mine underground cable wiring safety monitoring circuit, which is applied between multiple coal mine underground cable wiring safety monitoring boxes. The coal mine underground cable wiring safety monitoring box includes a box body 100, and a cable input interface 200 and a cable output interface 300 both connected to the box body 100. There are multiple cable output interfaces 300. A coal mine underground cable wiring safety monitoring circuit includes a monitoring subcircuit correspondingly arranged in each box body 100, and the monitoring subcircuit includes a power input measurement module 1, a data acquisition module 2, a data processing module 3 and a carrier communication module 4; The main cable line is introduced into the box 100 through the cable input interface 200, and extends to different branch lines through multiple cable output interfaces 300. The power input measurement module 1 is used to collect electrical parameters of the branch lines extending from each cable output interface 300. The electrical parameters at least include leakage monitoring parameters, temperature monitoring parameters and current monitoring parameters; The signal output end of the power input measurement module 1 is connected to the signal input end of the data acquisition module 2, the signal output end of the data acquisition module 2 is connected to the signal input end of the data processing module 3, a wireless communication path is established between the data processing module 3 and other correspondingly associated data processing modules 3, the wired communication data end of the data processing module 3 is connected to the first communication data end of the carrier communication module 4, the second communication data end of the carrier communication module 4 is connected to the second communication data end of the other correspondingly associated carrier communication modules 4, and the third communication data end of the carrier communication module 4 is connected to the host computer.

[0031] In this embodiment, the cable input interface 200 introduces the main cable line into the box 100, is the entrance of the power signal, and is connected to the power input measurement module 1 of the box 100. The main task of the power input measurement module 1 is to collect electrical parameters entering the cable junction box through the main cable line, including monitoring parameters such as current, temperature and leakage. Through the monitoring of these electrical parameters, the working status of the cable can be understood in real time, and whether there is an electrical abnormality can be detected in time. The signal output end of the power input measurement module 1 is connected to the data acquisition module 2. Through this connection, the collected data of the power input measurement module 1 can be transmitted to the data acquisition module 2, which further processes the data. The data acquisition module 2 receives the signal from the power input measurement module 1 and performs preliminary processing on it. The signal output end of the data acquisition module 2 is connected to the signal input end of the data processing module 3 to ensure that the collected data can be sent to the data processing module 3 for further analysis and calculation. The data processing module 3 is responsible for analyzing and integrating the data from different cable output interfaces 300, processing the data and judging whether it meets the preset threshold. If the electrical parameters (such as current, leakage or temperature) exceed the set threshold, the data processing module 3 can determine the possible fault point through calculation and determine the corresponding operation steps. The wired communication data terminal of the data processing module 3 is connected to the first communication data terminal of the carrier communication module 4 to ensure that the data can be transmitted through the carrier communication module 4. The second communication data terminal of the carrier communication module 4 is connected to the second communication data terminal of the carrier communication module 4 in other monitoring boxes to form a communication network between multiple monitoring boxes. These communication modules can share data to help determine the fault location and improve the accuracy of fault location. Through this setting, the monitoring boxes can communicate electrical parameters and fault information with each other, avoiding the problem that the data of a single monitoring point cannot fully reflect the status of the entire cable wiring system. The third communication data terminal of the carrier communication module 4 is connected to the host computer to upload the processed data or fault information to the host computer to achieve remote monitoring. The host computer can analyze the fault based on the received data and take necessary safety measures. Through this design of the carrier communication module 4, data can be transmitted using existing power lines in such a complex and harsh environment as underground coal mines, without the need to lay additional communication lines, thus reducing wiring costs and ensuring the real-time nature of data and the stability of transmission.

[0032] Furthermore, there are three communication protocols, namely, power line carrier communication (PLCC), which is used for long-distance data transmission; RS485 / CAN bus, which is used for data sharing of adjacent monitoring boxes; LoRa wireless (backup solution), which is suitable for scenarios with difficult wiring; the chip used in the data processing module 3 is STM32, and the chip used in the data acquisition module 2 is SZ001. This is because SZ001 itself generally does not have independent advanced computing capabilities, but is responsible for data acquisition, converting sensor signals into digital signals, and transmitting data through RS485 or CAN communication interfaces, but cannot independently perform complex data analysis or adjacent monitoring box data comparison. For STM32, first, it can be connected through I2C / SPI / UART sends the processed data to the local display unit, that is, performs local display operations. Second, STM32 is a high-performance ARMCortex-M series microcontroller equipped with Cortex-M7 or Cortex-M4 processors, with high computing performance. STM32 can fuse data from multiple sensors, such as Kalman filtering, weighted averaging and other algorithms, and combine the signals provided by different sensors for data processing. STM32 has a variety of communication interfaces and can interact with the host computer (such as PC, main control system, etc.). It is suitable for real-time data processing, anomaly detection and other tasks, and through RS485, CAN, USB and other communication interfaces, STM32 can interact with the host computer efficiently. Moreover, the use of power carrier communication (PLCC), that is, carrier communication module 4, is mainly to realize long-distance data transmission between the cable monitoring box and the host computer in the coal mine. Especially in the complex underground environment, power carrier communication can use the existing power lines for communication, avoiding the trouble of additional wiring. In the coal mine, the power lines are spread all over the area. The use of power carrier communication can save wiring costs and avoid the laying problem of traditional communication lines. However, the underground power line environment is complex, and there may be interference caused by electrical equipment (such as motors, inverters, etc.), resulting in carrier signal attenuation or instability. In addition, the bandwidth of power carrier communication is usually low, and it may not be able to support large-volume data transmission, especially when a large amount of data needs to be monitored in real time, it may not be flexible enough, so STM32 is required to transmit data through serial communication (such as RS485 and LoRa wireless communication). Therefore, we need to make it clear: First, if the power lines in the mine are widely and stably laid, and do not want to increase the cost of additional communication infrastructure, carrier communication can continue to exist, but its anti-interference, transmission rate and maintenance difficulty need to be solved; second, use RS485 / CAN bus or LoRa wireless communication to achieve stable communication and data processing through STM32. This solution can improve system reliability and reduce interference, and is especially efficient in environments with long-term operation and large data volume transmission.

[0033] In summary, a monitoring subcircuit is set inside each monitoring box, and the subcircuit integrates a power input measurement module 1, a data acquisition module 2, a data processing module 3 and a carrier communication module 4, ensuring real-time acquisition of electrical parameters and data interaction. The main cable line enters the monitoring box through the cable input interface 200, and branches to different lines at multiple cable output interfaces 300, and the power input measurement module 1 can collect leakage, current and temperature information of each branch line to ensure comprehensive monitoring of the operating status of the cable; during the data processing process, the signal of the power input measurement module 1 is transmitted to the data acquisition module 2, and then further transmitted to the data processing module 3 for calculation and analysis. In order to improve the accuracy of fault location, the monitoring circuit not only processes data inside a single monitoring box, but also establishes a wireless communication path between multiple monitoring boxes, so that the data processing modules 3 in different boxes 100 can exchange and compare electrical parameters with each other, so that the leakage point or fault area can be accurately identified based on multi-point data comparison; in order to meet the communication needs of the underground environment of the coal mine, the system adopts a communication method that combines wired and wireless. The wired communication data end of the data processing module 3 passes through the carrier communication module 4, so that the data can be transmitted between the monitoring boxes and between the host computer through the power carrier, and the second communication data end of the carrier communication module 4 is further connected to the carrier communication module 4 of other monitoring boxes to achieve long-distance transmission and sharing of data, ensuring that the fault information can be received and analyzed in real time by the remote monitoring center. In addition, the wireless communication path of the circuit can enhance the interaction between the monitoring boxes and improve the redundancy and anti-interference ability of the system.

[0034] In one embodiment, if Figure 2 As shown, the power input measurement module 1 includes a current mutual inductance unit 11, an insulation unit 12 and a temperature sensing unit 13, all of which are connected to the signal input end of the data acquisition module 2; The current transformer unit 11 includes three current transformers, each of which is used to measure the current monitoring parameter of each phase of the three-phase electricity; The insulation unit 12 at least includes a zero-sequence current transformer, which is used to measure leakage monitoring parameters between three-phase electricity; The temperature sensing unit 13 is used to measure temperature monitoring parameters.

[0035] In this embodiment, the current mutual inductance unit 11, the insulation unit 12 and the temperature sensing unit 13 are independent and closely cooperated, and multi-dimensional monitoring of the underground cable wiring system of the coal mine is realized by connecting to the signal input end of the data acquisition module 2. The current mutual inductance unit 11 includes three current mutual inductors, each of which is used to measure the monitoring parameters of each phase current in the three-phase electricity. These current mutual inductors can accurately collect real-time data of the three-phase current, and transmit the collected current data to the data acquisition module 2 through the signal output end. The data acquisition module 2 monitors the fluctuation of the current in real time based on these current data, so as to determine whether the electrical system has overload or other current anomalies. The function of the insulation unit 12 is to measure the leakage of the cable and ensure the safe operation of the cable system. The unit includes at least a zero-sequence current mutual inductor, which is mainly used to monitor the leakage monitoring parameters between the three-phase electricity. The zero-sequence current mutual inductor can detect any imbalance or leakage of the three-phase current, especially when the insulation fault occurs in the cable, the leakage information can be detected by measuring the zero-sequence current. The signal output end of the zero-sequence current transformer is connected to the data acquisition module 2, and the leakage data is transmitted to the data acquisition module 2 so as to detect and process the leakage in real time. The data acquisition module 2 determines whether the leakage exceeds the set threshold value based on these data. If it exceeds the threshold value, an alarm or other response measures may be triggered. The temperature sensing unit 13 is used to measure the temperature of the cable or power equipment to prevent safety hazards caused by overheating. The unit monitors the working temperature of the cable in real time through the temperature sensor and transmits the collected temperature data to the data acquisition module 2. The data acquisition module 2 will analyze the temperature data to determine whether the cable is overheated, and determine whether there is an overheating risk according to the set overtemperature threshold. If an abnormal temperature is detected, the system can generate a corresponding alarm through the data processing module 3, and can start a protection mechanism, such as cutting off the power supply or notifying the remote monitoring system. The signal output ends of these subunits are connected through the data acquisition module 2, and the data acquisition module 2 integrates all current, leakage and temperature monitoring data to form a comprehensive electrical monitoring data set, and sends it to the subsequent data processing module 3 or other modules. In this way, the entire system can monitor the status of the electrical system comprehensively and in real time, and respond in time when an abnormality occurs. By collecting the data of each monitoring unit into the data acquisition module 2, the data processing module 3 can better compare and analyze the electrical parameters of different monitoring points, determine whether there are risks such as faults, overloads or leakage, thereby improving the effectiveness and accuracy of safety monitoring of cable connections in underground coal mines.

[0036] In summary, the power input measurement module 1 can monitor key electrical parameters such as current, leakage and temperature respectively, and perform real-time collection and processing by integrating the current mutual inductance unit 11, the insulation unit 12 and the temperature sensor unit 13. The comprehensive use of these monitoring parameters enables the system to respond sensitively to different fault conditions and provide reliable data support for subsequent fault diagnosis and decision-making. Through the effective collaboration of these modules, the health status of electrical equipment can be understood in real time, thereby improving the accuracy and timeliness of underground cable monitoring in coal mines.

[0037] In one embodiment, if Figure 2 As shown, the monitoring subcircuit also includes a switching power supply control module 5, the power input end of the switching power supply control module 5 is connected to the cable main line, and the power output end of the switching power supply control module 5 outputs voltage to the data acquisition module 2 and the carrier communication module 4 for power supply.

[0038] In this embodiment, the switch power supply control module 5 plays a role in providing a stable power supply for the entire monitoring subcircuit. Specifically, the power input end of the switch power supply control module 5 is connected to the cable main line, which means that the input signal of the power supply comes directly from the power system in the coal mine shaft and is transmitted to the switch power supply control module 5 through the cable main line. The cable main line undertakes the main power supply task of the system. After the power input enters the switch power supply control module 5 through the power input end, it starts to regulate the voltage and distribute the power to other modules inside it. The power output end of the switch power supply control module 5 is divided into multiple outputs, which supply power to different modules respectively. In this scheme, the power output end sends the appropriate voltage to the data acquisition module 2 and the carrier communication module 4 respectively through different voltage output ports. The data acquisition module 2 needs a stable power supply to support its acquisition and processing of electrical parameters from the current transformer, zero-sequence current transformer and temperature sensor unit 13, while the carrier communication module 4 needs power to ensure the normal operation of its communication function, especially when using power carrier for signal transmission, the power supply of the carrier communication module 4 is crucial. The switch power supply control module 5 itself has intelligent voltage conversion and regulation functions, which can ensure that the data acquisition module 2 and the carrier communication module 4 can work stably under different voltage requirements. The design of the switch power supply control module 5 is usually efficient and can dynamically adjust the current according to the power requirements of the module, thereby ensuring that the system will not be interrupted due to insufficient power supply during operation. Especially in a high-risk environment such as underground coal mines, a stable power supply is a prerequisite for ensuring the safe operation of the system.

[0039] In summary, the switch power supply control module 5 can ensure the stable power supply of the data acquisition module 2 and the carrier communication module 4, and maintain the long-term operation stability of the system in the special environment of the coal mine. The safety and stability of the system are enhanced, and the monitoring interruption or equipment damage caused by unstable power supply is avoided.

[0040] In one embodiment, if Figure 2 As shown, a power switch 6 and a fuse module 7 connected in series are provided between the power input end of the switch power control module 5 and the main cable line.

[0041] In this embodiment, the power switch 6 is a key component for controlling the power supply on and off, and can cut off the power supply when necessary to prevent the power supply from continuing to be supplied when the system fails, causing further damage. Under normal operation, the power switch 6 remains in a closed state, allowing power to enter the switch power control module 5 from the cable main line, providing a stable power supply for the subsequent circuit modules. However, if an abnormal situation occurs in the system, such as overload, short circuit, etc., the power switch 6 can cut off the power supply to prevent excessive current from causing damage to the circuit. The fuse module 7 is connected in series with the power switch 6 to provide additional protection functions. In the case of overcurrent or circuit short circuit, the fuse will melt due to excessive current, thereby cutting off the flow of current. It can disconnect the circuit in time when an electrical fault occurs, avoiding serious damage to power equipment, sensors and other circuit parts when the current is too large. The working principle of the fuse is very simple. When the current exceeds the set threshold, the fuse will automatically disconnect the current path to prevent further damage to the equipment. The series structure of the power switch 6 and the fuse module 7 enables the entire circuit to have double protection. When overcurrent, short circuit or other electrical faults occur, the fuse will first cut off the current by melting, and the power switch 6 can be manually reset as needed to restore the power supply of the system. It can not only effectively protect the power equipment and ensure the continuous and stable operation of the underground cable wiring system in the coal mine in a complex and harsh environment, but also reduce the risk of equipment damage caused by electrical faults and improve the safety and reliability of the system.

[0042] In summary, the common node between the fuse module 7 and the carrier communication module 4 is connected to the overvoltage signal acquisition terminal of the data acquisition module 2, so that the system can monitor the overvoltage condition of the power supply end in real time. Once an overvoltage event occurs, the system can collect overvoltage data in time and use it as a fault parameter for further processing. This design enables the circuit to automatically take protective measures in an overvoltage environment, reduce damage to electrical equipment, and further improve the reliability and safety of the system.

[0043] In one embodiment, if Figure 2 As shown, the common node between the fuse module 7 and the carrier module is connected to the overvoltage signal acquisition terminal of the data acquisition module 2 to acquire the corresponding overvoltage monitoring parameters.

[0044] In this embodiment, the function of the fuse module 7 is to disconnect the circuit to prevent damage caused by overload or short circuit. When the current in the circuit is too large, the fuse will melt due to the current overload and disconnect the circuit. The common node connected to the fuse module 7 is connected to the overvoltage signal acquisition end of the data acquisition module 2. This connection ensures that when overvoltage occurs in the power system, the overvoltage signal can be transmitted to the data acquisition module 2 for monitoring in time. The function of the overvoltage signal acquisition end in the data acquisition module 2 is to detect whether the voltage in the electrical system exceeds the set safety threshold. If the voltage exceeds the preset threshold, it means that there may be an overvoltage phenomenon in the system, which may cause safety hazards such as equipment damage and insulation aging. In this case, the overvoltage signal acquisition end will transmit the signal of the voltage change to the data acquisition module 2, and the data acquisition module 2 will further analyze it to determine whether the voltage exceeds the set safety range. If the voltage is abnormal, the data acquisition module 2 will transmit the overvoltage data to the data processing module 3 to further determine whether it is necessary to take protective measures such as alarm or power off. The system can effectively monitor the voltage condition in the electrical system and prevent the overvoltage phenomenon from causing potential damage to electrical equipment and monitoring systems. The protection of the fuse module 7 and the monitoring of the overvoltage signal form a dual protection mechanism, which enhances the safety of the system. On the one hand, when the current is too large, the fuse can disconnect the circuit to avoid damage caused by overcurrent; on the other hand, through the overvoltage signal collection, the system can respond in time when the voltage is abnormal, reducing the impact of voltage fluctuations on equipment and systems.

[0045] In summary, the common node between the fuse module 7 and the carrier communication module 4 is connected to the overvoltage signal acquisition terminal of the data acquisition module 2, so that the system can monitor the overvoltage condition of the power supply end in real time. Once an overvoltage event occurs, the system can collect overvoltage data in time and use it as a fault parameter for further processing. This design enables the circuit to automatically take protective measures in an overvoltage environment, reduce damage to electrical equipment, and further improve the reliability and safety of the system.

[0046] A method for monitoring cable wiring safety in underground coal mines is applied to a circuit for monitoring cable wiring safety in underground coal mines. The method for monitoring cable wiring safety in underground coal mines includes: S10. If a power signal is detected, an initialization operation is performed to detect whether the initialization operation is successfully performed. If not, a corresponding warning operation is performed. Specifically, first, it is detected whether the power input end receives a valid power signal from the cable main line. If the power signal exists, the initialization operation is started. This operation includes powering on and initializing the data acquisition module 2, the communication module, and the power input measurement module 1 to ensure that the hardware status of all related modules is ready. The initialization process includes but is not limited to setting the electrical parameter acquisition frequency, configuring the communication protocol, and ensuring that the data path is unobstructed. If it is detected during the initialization process that the module cannot be started normally or the initialization fails, such as the power input signal is unstable or the device configuration is abnormal, a preset warning operation will be triggered, such as an alarm through a local display device or a buzzer to prompt a power failure or equipment failure, to ensure that the problem is discovered in time and corresponding measures are taken.

[0047] S20. If the execution is successful, the electrical parameters are obtained in real time to determine whether the electrical parameters exceed the preset electrical threshold. If the electrical parameters do not exceed the preset electrical threshold, the determination is continued. Specifically, after the initialization is successful, the electrical parameters are obtained in real time, mainly including current, temperature and leakage parameters. The current transformer, zero-sequence current transformer and temperature sensor unit 13 in the power input measurement module 1 continuously collect parameters such as current, voltage, leakage current and temperature. The acquired data will be input into the data acquisition module 2 for preliminary processing. The data acquisition module 2 compares the acquired electrical parameters with the preset electrical threshold. If the electrical parameters do not exceed the set threshold, the monitoring is continued and new data is regularly acquired to keep real-time tracking of the electrical system status until the electrical parameters exceed the threshold and automatically enter the next step of processing.

[0048] S30. If the preset electrical threshold is exceeded, the corresponding associated sub-circuit is determined, and a data communication request is sent to each associated sub-circuit respectively; specifically, when the electrical parameter exceeds the preset threshold, such as current exceeding the limit, temperature being too high or leakage being too large, the identification and data request of the corresponding associated sub-circuit is automatically triggered. First, the relevant monitoring circuit is determined according to the fault type. For example, if it is a leakage fault, the associated circuit is the adjacent monitoring box at both ends of the cable main line. If it is a current overload fault, the associated circuit is the monitoring box on the same power supply circuit. If the temperature is too high, the nearest monitoring circuit is selected, and a data request is sent to the relevant sub-circuit through the carrier communication module 4, requiring it to provide the current fault feedback parameters. These requests are transmitted between the monitoring boxes through carrier communication to ensure that the fault information is accurately transmitted and processed in a timely manner.

[0049] S40, real-time reception of fault feedback parameters generated and sent by the associated sub-circuit based on the data communication request; specifically, after sending the data request, the related sub-circuit will immediately analyze and process the currently collected electrical parameters after receiving the request, generate fault feedback parameters containing monitoring information such as current, leakage, temperature, etc., and return them to the data acquisition module 2 through the carrier communication module 4. The data acquisition module 2 will receive these feedback data in real time within the specified time to ensure the timeliness and accuracy of the feedback information. After receiving the data, it will be immediately passed to the data processing module 3 for further analysis, so as to ensure that the entire system can accurately identify the fault area and fault type, and prepare for subsequent processing.

[0050] S50, analyzing the fault feedback parameters and electrical parameters, generating corresponding communication data, and the communication data is used to perform the host computer communication operation and / or the local display operation. Specifically, the fault feedback parameters and electrical parameters are further analyzed by the data processing module 3, and the data processing module 3 generates detailed fault analysis data according to the comparison results of the received electrical parameters and feedback parameters. If leakage, overcurrent, overtemperature and other abnormalities are confirmed, specific communication data is generated according to the fault type, and the data is formatted according to the set protocol. The formatted data will be used to perform the host computer communication operation or the local display operation. If the host computer communication operation is triggered, the fault information is uploaded to the remote monitoring system through the carrier communication module 4 to ensure that the remote operator can receive and analyze the fault in time; if it is a local display operation, the data will be presented through the local display device to help the on-site operator judge the current electrical condition and take appropriate countermeasures, so as to improve the response efficiency and safety of cable wiring monitoring.

[0051] In summary, real-time monitoring and processing of electrical parameters can be achieved in the underground cable wiring system of coal mines. The power input measurement module 1 can collect electrical parameters such as current, leakage and temperature in real time, while the data acquisition module 2 and the data processing module 3 can effectively analyze and process these collected parameters to ensure that the system can identify and respond to faults in a timely manner. In addition, the design of the carrier communication module 4 can realize remote transmission and processing of data, making the system's monitoring capabilities more intelligent, able to operate effectively in the underground environment of coal mines, and improving the safety and operational stability of coal mine cable wiring systems.

[0052] In one embodiment, if Figure 2 As shown, in step S20, i.e., the step of determining whether the electrical parameter exceeds a preset electrical threshold, the preset electrical threshold includes a leakage threshold, an over-temperature threshold, and an over-current threshold, including: S201, based on the zero-sequence current transformer measuring the leakage monitoring parameters between the three-phase electricity, determine whether the leakage monitoring parameters exceed the leakage threshold; specifically, the zero-sequence current transformer is used to measure the leakage or unbalanced current in the three-phase power system. It detects leakage by sensing the difference between the three-phase currents. The three-phase power system is usually composed of three live wires, namely phases A, B, and C. Under normal circumstances, the three-phase currents are balanced, that is, the magnitude of each phase current is equal and the direction is opposite. When leakage occurs, the current will flow from the power supply line to the ground or the casing of the equipment, causing the three-phase current to no longer be balanced. The zero-sequence current transformer is installed around the three main conductors of the three-phase power supply to form a ring-shaped induction structure. It can simultaneously sense the composite current of the three-phase current. When the composite value of the three-phase current is zero, it means that the current is balanced. Once the three-phase current is unbalanced, the zero-sequence current transformer can sense a non-zero current. This unbalanced current is the so-called zero-sequence current. The induction coil in the zero-sequence current transformer converts the unbalanced current into a corresponding voltage signal, and transmits the signal to the data acquisition module 2 through the signal output terminal, which processes the signal. If the signal exceeds the preset leakage threshold, it means that a leakage fault may have occurred, triggering the corresponding alarm or protection measures. Therefore, the core function of the zero-sequence current transformer is to detect the balance state of the three-phase current in real time, and to determine whether there is leakage by sensing the imbalance of the current, thereby ensuring the safety of the electrical system.

[0053] S202, based on the current monitoring parameters of each phase of the three-phase electricity measured by three current transformers, determine whether the current monitoring parameters exceed the overcurrent threshold; specifically, the three current transformers are respectively installed on each electrical conductor of the three-phase electrical system, and are used to measure the current monitoring parameters of each phase current. Specifically, each current transformer is installed around a phase wire (phase A, phase B, phase C), and monitors the corresponding current value by sensing the current in this wire. The working principle of the current transformer is to use the principle of electromagnetic induction. When the current flows through the wire, a corresponding induced current will be generated in the coil of the current transformer. The current transformer converts the current passing through the wire into an induced current signal in the coil, which is proportional to the current flowing through the wire. The induction coil of each current transformer monitors the current of phase A, phase B and phase C respectively. They will generate a corresponding signal output according to the change of each phase current, and this output signal will be transmitted to the data acquisition module 2, and the data acquisition module 2 will calculate the current monitoring parameters of the three-phase current in real time according to the collected signal. The current monitoring data of phase A, phase B and phase C are obtained through three mutual inductors respectively, and the data acquisition module 2 can process the change of each phase current respectively, and further determine whether the current exceeds the set overcurrent threshold. These current monitoring parameters can help detect current anomalies, overloads or other electrical faults in subsequent analysis, and then make corresponding processing or alarms.

[0054] S203, based on the temperature monitoring parameters in the box 100 measured by each temperature sensing element, determine whether the temperature monitoring parameters exceed the over-temperature threshold. Specifically, the temperature sensing element monitors whether the device is at risk of overheating by measuring the temperature in the box 100 in real time. Specifically, the temperature sensing element is usually installed in key parts of the cable connection box 100, which may include areas such as cable joints, terminal blocks, and gaps near the equipment, which usually generate heat due to current flow or equipment operation. Temperature sensing elements (such as thermistors, thermocouples, etc.) can sense changes in ambient temperature and convert them into electrical signals.

[0055] In summary, through accurate measurement based on zero-sequence current transformers, three current transformers and temperature sensing elements, it is possible to accurately identify leakage, overcurrent and overtemperature problems in underground cable wiring systems in coal mines. This solution can compare and analyze the leakage monitoring parameters, overcurrent monitoring parameters and temperature monitoring parameters collected in real time with the set thresholds, detect electrical anomalies in a timely manner, and avoid safety accidents caused by leakage, overcurrent or overtemperature. Through the implementation of this solution, the safety of the cable wiring system has been significantly improved, and it can respond quickly when an abnormality occurs, reducing potential safety hazards.

[0056] In one embodiment, if Figure 2 As shown, in step S30, i.e., the step of determining the corresponding associated sub-circuit, the associated sub-circuit includes a leakage associated sub-circuit, an overcurrent associated sub-circuit and an overtemperature associated sub-circuit, including: S3011. Determine the fault type corresponding to the electrical parameters; specifically, first determine whether an abnormal situation occurs based on the collected electrical parameters, such as current, leakage, temperature, etc., by comparing them with the preset normal working parameters. If the electrical parameters such as current value, leakage current or temperature value exceed the set threshold, the fault type is determined. If the leakage current increases abnormally, it is judged as a leakage fault; if the current exceeds the preset range, it is judged as an overcurrent fault; if the temperature exceeds the safe working range, it is judged as an overtemperature fault. The determination of the fault type is the first step in the whole process. By analyzing the electrical parameters, the specific category of the fault is determined, laying the foundation for the subsequent determination of the associated sub-circuit.

[0057] S3012. Determine the corresponding association rules based on the mapping relationship determined by the fault type; specifically, first determine whether an abnormal situation occurs by comparing the collected electrical parameters, such as current, leakage, temperature, etc., with the preset normal working parameters. If the electrical parameters such as current value, leakage current or temperature value exceed the set threshold, the fault type is determined. If the leakage current increases abnormally, it is judged as a leakage fault; if the current exceeds the preset range, it is judged as an overcurrent fault; if the temperature exceeds the safe working range, it is judged as an overtemperature fault. The judgment of the fault type is the first step of the whole process. By analyzing the electrical parameters, the specific category of the fault is determined, laying the foundation for the subsequent determination of the associated sub-circuit.

[0058] S3013. If the association rule is a leakage rule, the adjacent monitoring subcircuits at the front and rear ends of the cable main line are determined as leakage associated subcircuits; specifically, in leakage detection, the adjacent monitoring subcircuits at the front and rear ends of the cable main line are usually the areas where leakage is most likely to occur, so these two monitoring subcircuits are used as leakage associated subcircuits to achieve accurate fault location. The front and rear ends of the cable main line are usually connected to different electrical equipment or branch lines. When leakage occurs, the leakage current will leak through the insulation layer of the cable to the ground or other conductors. Therefore, monitoring the leakage situation at both ends of the cable main line can cover the starting point and end point of the cable system. This design can ensure that when leakage occurs, the problem is detected first and the leakage area can be quickly determined by comparing the associated subcircuits, preventing the leakage current from propagating in the system and reducing potential harm to equipment and personnel. At the same time, the difference in electrical parameters at the front and rear ends can help determine the specific location of the leakage, enhance the system's response capability to faults, and reduce the time and scope of fault detection. By monitoring the associated subcircuits at these two ends, leakage problems can be discovered and handled in a timely manner to ensure the safe operation of the power system and underground equipment in coal mines.

[0059] S3014. If the association rule is an overcurrent rule, adjacent monitoring subcircuits on the same power supply circuit are determined as overcurrent associated subcircuits; specifically, in overcurrent fault detection, adjacent monitoring subcircuits on the same power supply circuit are determined as overcurrent associated subcircuits because the change of current on the same circuit will directly affect the transmission of power and the distribution of load. Overcurrent usually occurs when the circuit load is too large, and the current will exceed the design capacity of the circuit, resulting in cable overload or even equipment damage. If overcurrent occurs on the same power supply circuit, the abnormal change of current will be reflected between adjacent monitoring subcircuits in the circuit, especially the sudden increase of current will affect multiple monitoring points in the circuit at the same time. Therefore, by selecting adjacent monitoring subcircuits for association, the abnormal current fluctuation can be quickly captured, and the location and cause of overcurrent can be determined. At the same time, the current comparison between adjacent monitoring subcircuits can help to more accurately determine whether it is an overcurrent fault, and by calculating the current difference to confirm whether the fault originates from a certain section of the power supply circuit, thereby reducing the scope of fault diagnosis, improving the efficiency of fault location, and ensuring that protective measures are taken quickly, such as cutting off the power supply or adjusting the load, to prevent further damage to the system.

[0060] S3015. If the association rule is an over-temperature rule, the closest monitoring sub-circuit is determined to be an over-temperature associated sub-circuit. Specifically, in over-temperature fault detection, the closest monitoring sub-circuit is determined to be an over-temperature associated sub-circuit because over-temperature faults are usually caused by excessive current in a local area or abnormal operation of the equipment, and these problems usually appear first in the area near the fault source. If the temperature anomaly occurs at a certain position of an electrical component or cable, the most directly affected monitoring sub-circuit is usually the sub-circuit closest to the position. By selecting the monitoring sub-circuit closest to the fault source, the signal of temperature rise can be quickly captured, the over-temperature phenomenon can be discovered in time, and appropriate countermeasures can be taken. Such a design can improve the accuracy of fault location, reduce the time required for fault diagnosis, and avoid safety risks such as equipment damage or fire caused by excessive temperature. In this way, the system can identify and respond to over-temperature faults in the shortest time, ensuring the safe and stable operation of the underground cable wiring system in coal mines.

[0061] In summary, by setting the leakage, overcurrent and overtemperature association rules, the sub-circuit where the problem occurs can be accurately located according to different electrical fault types. These rules select the corresponding associated sub-circuit based on the fault type of the electrical parameters. Through this step, the system can take corresponding monitoring measures for different fault types to further improve the accuracy of fault diagnosis. For example, in the case of a leakage fault, the adjacent monitoring sub-circuit before and after the main cable line is determined, the monitoring sub-circuit of the same power supply circuit is selected in the case of an overcurrent fault, and the nearest monitoring sub-circuit is selected in the case of an overtemperature fault, thereby effectively narrowing the scope of fault investigation and improving the efficiency of fault location.

[0062] In one embodiment, if Figure 2 As shown, in step S30, that is, before the step of sending a data communication request to each associated sub-circuit respectively, it also includes: S3021. Calculate the comparison difference between each electrical parameter and the corresponding preset electrical threshold; specifically, during the operation of the electrical system, the real-time collected electrical parameters such as current, leakage current, temperature, etc. will be compared with the preset safety threshold. The preset electrical threshold is set according to the working characteristics and safety standards of the equipment or cable, such as current threshold, leakage threshold and temperature threshold. If the collected electrical parameters differ from these set thresholds, the difference will be calculated, which reflects the deviation between the actual working state and the safety standard. For example, if the actual current is 12A and the set overcurrent threshold is 10A, the difference is 2A, indicating that the current exceeds the safety range. In this way, the degree of abnormality can be clearly identified and the necessary quantitative data can be provided for subsequent judgment.

[0063] S3022. Classify and aggregate each electrical parameter according to the fault type, and generate a corresponding classification parameter set; specifically, when it is detected that the difference of the electrical parameters exceeds the set threshold, the system will classify each electrical parameter according to the fault type. For example, if the current exceeds the threshold, it is classified as an overcurrent fault; if the zero-sequence current (leakage current) exceeds the standard, it is classified as a leakage fault; if the temperature exceeds the safe range, it is classified as an overtemperature fault. This classification process ensures that the electrical parameters on which each fault type depends are effectively distinguished and processed. For example, the classification parameter set for leakage faults may include leakage current, related voltages, and temperatures, while the classification parameter set for overcurrent faults will include parameters related to current load, such as current value and power. Through this classification set, the system can have a clearer understanding of the nature of the fault and ensure that the goals of subsequent processing are clear.

[0064] S3023. Generate rules according to a preset order and determine the weight coefficients corresponding to each classification parameter set; specifically, the system will assign corresponding weight coefficients to each classification parameter set according to the urgency and impact range of the fault type. For example, if a leakage fault occurs at both ends of the main cable line and may cause serious consequences, the classification parameter set of the leakage rule may be assigned a higher weight coefficient; while an overcurrent fault, if it occurs under a smaller load, may not cause large-scale system damage and may be assigned a lower weight coefficient. The setting of the weight coefficient is based on the degree of impact of the fault type on the system and the need for emergency processing. This setting helps the system prioritize different faults so that important and urgent faults can be handled first.

[0065] S3024. Add all the contrast differences corresponding to the electrical parameters contained in the classification parameter set to generate the corresponding difference parameters, and use the product of the difference parameters and the weight coefficient as the order determination parameter; specifically, the system first accumulates all the contrast differences corresponding to the electrical parameters in each classification parameter set to obtain a total difference parameter. For example, in the classification parameter set of overcurrent fault, there may be a current difference and a power difference. The system adds these two differences to obtain a total difference parameter. If the current difference and temperature difference of the leakage fault also belong to the classification parameter set, the system will add these differences to obtain the difference parameter of the leakage fault. Then, these difference parameters are multiplied by the previously set weight coefficient to generate an order determination parameter. This parameter reflects each fault type and its severity, and determines which fault needs to be handled first. In other words, the level of the order determination parameter directly affects the priority of fault processing. Faults with larger differences and higher weights will be handled first.

[0066] S3025. According to the order determination parameter, determine the corresponding request sending order. The request sending order is used to determine the sending order of data communication requests to each associated sub-circuit; specifically, the system determines the priority of processing requests according to the order determination parameters of each classification parameter set. If the order determination parameter of a certain fault is large, it means that the fault is more urgent and needs to be handled with priority. For example, if the order determination parameter of the leakage fault is the largest, the system will give priority to sending data requests to the monitoring sub-circuit related to the leakage, and postpone the sending of requests for other fault types. Through this priority-based request sending order, the system can ensure that the most serious faults are responded to in the shortest time, avoid processing delays caused by multiple faults occurring at the same time, and ensure fault handling efficiency and system safety. Especially in the complex underground environment of coal mines, this mechanism can effectively improve the real-time fault detection and response capabilities of the power system.

[0067] For example, suppose that in the power system underground in a coal mine, the current monitoring module detects that the current parameter is 15A, while the preset overcurrent threshold is 10A, and the calculated current difference is 5A. At the same time, the temperature sensing module detects that the temperature inside the box 100 is 80°C, while the set overtemperature threshold is 70°C, and the calculated temperature difference is 10°C. The leakage monitoring module measures the leakage current as 5mA through the zero-sequence current transformer, which exceeds the set leakage threshold of 3mA, and the difference is 2mA. The system calculates the corresponding order judgment parameters based on these differences, and judges that the current fault is the most serious one among overcurrent, overtemperature and leakage according to the mapping rules of the fault type. Assuming that the weight coefficient of overcurrent is high, the system will first prioritize the overcurrent fault according to the difference and weight coefficient of overcurrent, and then handle the overtemperature and leakage fault according to the priority of other faults, ensuring that the most critical fault is responded to first, thereby preventing equipment damage and improving the safety of the system.

[0068] In summary, by calculating the difference between the electrical parameters and the preset electrical thresholds and generating a classification parameter set, the system can more scientifically weight the electrical parameters and ultimately determine the order in which the requests are sent. According to the preset order generation rules, the system generates order determination parameters by multiplying the difference by the weight coefficient, thereby optimizing the order of data communication. This design can reasonably arrange the processing priority when multiple faults occur at the same time, ensuring that the most urgent faults are handled first, thereby improving the response efficiency and fault handling speed of the underground cable wiring monitoring system in coal mines.

[0069] In one embodiment, if Figure 2 As shown, in step S50, i.e., the step of analyzing the fault feedback parameters and electrical parameters to generate corresponding communication data, the fault feedback parameters include leakage feedback parameters, current feedback parameters and temperature feedback parameters, including: S501. According to the leakage parameter comparison results between the leakage feedback parameter and the leakage monitoring parameter, determine whether there is cable leakage. If there is, determine the corresponding leakage point based on the leakage parameter comparison results; specifically, the leakage feedback parameter is a signal returned by the zero-sequence current transformer in the monitoring subcircuit, indicating the balance of the current. If the current between the three-phase electricity is unbalanced, the zero-sequence current will not be zero, indicating that there may be leakage. The leakage monitoring parameter determines the size of the current leakage current based on the preset leakage threshold. By comparing the feedback parameter with the monitoring parameter, the system can determine whether the cable system has leakage and determine the leakage point. For example, if the zero-sequence current comparison at the front and rear ends of the cable main line shows that the current difference is large, it can be determined that the leakage occurs between the two monitoring subcircuits, and the system can determine the location of the leakage and alarm or perform further protection operations.

[0070] S502. According to the current parameter comparison results between the current feedback parameter and the current monitoring parameter, determine whether there is a power supply anomaly. If there is, determine the corresponding anomaly type based on the current gradient difference corresponding to the current parameter comparison result; specifically, the current feedback parameter refers to the current data returned from other monitoring subcircuits, while the current monitoring parameter is the current value collected locally. The system determines whether there is a power supply anomaly in the power system by comparing the difference between the two. The current gradient difference refers to the variation range of the current value between different monitoring points in the same power circuit. If the current gradient difference is large, it means that there is an abnormality in the power supply circuit, such as a sudden increase or decrease in current, which may be an overload, short circuit, etc. For example, if the current changes significantly when flowing from one monitoring subcircuit to another, the system will identify it as a power supply anomaly and further analyze its specific cause, such as whether it is a current surge caused by a short circuit or excessive load.

[0071] S503. Determine the corresponding over-temperature area according to the temperature parameter comparison result between the temperature feedback parameter and the temperature monitoring parameter; specifically, the temperature feedback parameter comes from the remote monitoring module or the adjacent monitoring subcircuit, indicating the temperature state of the current area, and the temperature monitoring parameter is the real-time temperature data collected locally. The comparison between the two can determine whether the equipment is overheated. If the feedback temperature data is higher than the normal working range of local monitoring, it indicates that there is an over-temperature problem in the area. The temperature comparison result can help locate the area where the over-temperature fault occurs. For example, equipment such as cable connectors, transformers or junction boxes may cause abnormal temperature due to overload or aging of insulation materials during long-term operation. In this way, the system can quickly determine the specific area where the fault occurs and trigger corresponding protection measures or alarms.

[0072] S504, integrate and transform the leakage point, abnormal type and / or over-temperature area, generate corresponding protocol standardized data, and generate corresponding communication data according to the request sending order and protocol standardized data; specifically, after confirming the leakage point, abnormal type (such as over-current or over-temperature) and over-temperature area, the system integrates these data into standardized protocol data for transmission through the network or carrier communication module 4. Protocol standardized data is to ensure that the data between different modules or systems can be in a unified format for easy parsing and processing. The order of request sending determines the fault that the system should prioritize when multiple fault types occur simultaneously. The communication data generated by these data will be sent to the host computer or local display terminal for processing and display. For example, if the order judgment parameter of the leakage fault is higher, the system will prioritize the leakage fault and transmit the fault information to the host computer through the standardized data protocol for analysis and decision-making to ensure the timeliness and accuracy of the fault response.

[0073] In summary, the analysis steps of fault feedback parameters can effectively judge the leakage, power supply anomaly and over-temperature area in the cable wiring system and accurately locate the source of the fault by comparing the leakage feedback parameters, current feedback parameters and temperature feedback parameters. According to the leakage parameters, fault current gradient differences and temperature changes, the system can generate communication data according to the standardized protocol and perform host computer communication operations or local display operations, and upload the fault information to the monitoring system in time. This solution integrates the fault information of leakage points, abnormal types and over-temperature areas, generates a standardized data protocol, and ensures the reliability and consistency of data during the communication process, thereby further improving the fault detection and response capabilities of the underground cable wiring system in coal mines and ensuring the safe operation of the entire power system.

[0074] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person 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 may be replaced by equivalents. Such 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 application, and should all be included in the protection scope of the present application.

Claims

1. A coal mine underground cable wiring safety monitoring circuit, characterized in that: Applicable to multiple coal mine underground cable wiring safety monitoring boxes, the coal mine underground cable wiring safety monitoring box comprising a box body (100), and a cable input interface (200) and a cable output interface (300) both connected to the box body (100), wherein a plurality of the cable output interfaces (300) are provided, and the coal mine underground cable wiring safety monitoring circuit comprises a monitoring subcircuit correspondingly arranged in each of the boxes (100), wherein the monitoring subcircuit comprises a power input measurement module (1), a data acquisition module (2), a data processing module (3) and a carrier communication module (4); The main cable line is introduced into the box (100) through a cable input interface (200) and extends to different branch lines through a plurality of cable output interfaces (300), and the power input measurement module (1) is used to collect electrical parameters of the branch lines extending from each cable output interface (300), wherein the electrical parameters at least include leakage monitoring parameters, temperature monitoring parameters and current monitoring parameters; The signal output end of the power input measurement module (1) is connected to the signal input end of the data acquisition module (2), the signal output end of the data acquisition module (2) is connected to the signal input end of the data processing module (3), a wireless communication path is established between the data processing module (3) and other correspondingly associated data processing modules (3), the wired communication data end of the data processing module (3) is connected to the first communication data end of the carrier communication module (4), the second communication data end of the carrier communication module (4) is connected to the second communication data end of other correspondingly associated carrier communication modules (4), and the third communication data end of the carrier communication module (4) is connected to a host computer.

2. A coal mine underground cable connection safety monitoring circuit according to claim 1, characterized in that: The power input measurement module (1) comprises a current mutual inductance unit (11), an insulation unit (12) and a temperature sensing unit (13), all of which are connected to the signal input end of the data acquisition module (2); The current mutual inductance unit (11) comprises three current mutual inductors, each of which is used to measure the current monitoring parameter of each phase of three-phase electricity; The insulation unit (12) at least comprises a zero-sequence current transformer, and the zero-sequence current transformer is used to measure leakage monitoring parameters between three-phase electricity; The temperature sensing unit (13) is used to measure the temperature monitoring parameter.

3. A coal mine underground cable connection safety monitoring circuit according to claim 1, characterized in that: The monitoring subcircuit further comprises a switching power supply control module (5), wherein a power supply input end of the switching power supply control module (5) is connected to the main cable line, and a power supply output end of the switching power supply control module (5) outputs voltage to the data acquisition module (2) and the carrier communication module (4) for power supply.

4. A coal mine underground cable connection safety monitoring circuit according to claim 3, characterized in that: A power switch (6) and a fuse module (7) which are sequentially connected in series are provided between the power input end of the switch power control module (5) and the main cable line.

5. A coal mine underground cable connection safety monitoring circuit according to claim 4, characterized in that: The common node between the fuse module (7) and the carrier module is connected to the overvoltage signal acquisition end of the data acquisition module (2) for acquiring corresponding overvoltage monitoring parameters.

6. A method for monitoring cable connection safety in underground coal mines, characterized in that: Applied to a coal mine underground cable connection safety monitoring circuit as claimed in any one of claims 1 to 5, the coal mine underground cable connection safety monitoring method comprises: If a power signal is detected, an initialization operation is performed to detect whether the initialization operation is successfully performed. If not, a corresponding warning operation is performed; If the execution is successful, the electrical parameters are obtained in real time to determine whether the electrical parameters exceed a preset electrical threshold value, and if the electrical parameters do not exceed the preset electrical threshold value, the determination is continued; If the preset electrical threshold is exceeded, the corresponding associated sub-circuit is determined, and a data communication request is sent to each of the associated sub-circuits respectively; receiving in real time a fault feedback parameter generated and sent by the associated sub-circuit based on the data communication request; The fault feedback parameters and the electrical parameters are analyzed to generate corresponding communication data, where the communication data is used to perform host computer communication operations and / or local display operations.

7. A method for monitoring cable connection safety in underground coal mines according to claim 6, characterized in that: In the step of determining whether the electrical parameter exceeds a preset electrical threshold, the preset electrical threshold includes a leakage threshold, an over-temperature threshold and an over-current threshold, including: Measuring a leakage monitoring parameter between three-phase electricity based on a zero-sequence current transformer, and determining whether the leakage monitoring parameter exceeds the leakage threshold; Based on the current monitoring parameters of each phase of the three-phase electricity measured by the three current transformers, determining whether the current monitoring parameters exceed the overcurrent threshold; Based on the temperature monitoring parameters measured by each temperature sensing element in the box, it is determined whether the temperature monitoring parameters exceed the over-temperature threshold.

8. A method for monitoring cable connection safety in underground coal mines according to claim 6, characterized in that: In the step of determining the corresponding associated sub-circuit, the associated sub-circuit includes a leakage associated sub-circuit, an overcurrent associated sub-circuit and an overtemperature associated sub-circuit, including: Determining a fault type corresponding to the electrical parameter; Determine the mapping relationship based on the fault type and determine the corresponding association rule; If the association rule is a leakage rule, then the adjacent monitoring subcircuits at the front and rear ends of the main cable are determined as leakage association subcircuits; If the association rule is an overcurrent rule, then adjacent monitoring subcircuits on the same power supply circuit are determined to be overcurrent associated subcircuits; If the association rule is an over-temperature rule, the monitoring sub-circuit closest to the monitoring sub-circuit is determined to be an over-temperature associated sub-circuit.

9. A method for monitoring cable connection safety in underground coal mines according to claim 8, characterized in that: Before the step of sending data communication requests to each of the associated sub-circuits respectively, the method further includes: Calculate the difference between each electrical parameter and the corresponding preset electrical threshold; Classify and aggregate the electrical parameters according to the fault type to generate a corresponding classification parameter set; Determine the weight coefficient corresponding to each of the classification parameter sets according to a preset order generation rule; Adding all the comparison differences corresponding to the electrical parameters contained in the classification parameter set to generate corresponding difference parameters, and taking the product of the difference parameters and the weight coefficient as the order determination parameter; According to the order determination parameter, a corresponding request sending order is determined, and the request sending order is used to determine the sending order of sending data communication requests to each of the associated sub-circuits.

10. A method for monitoring cable connection safety in underground coal mines according to claim 9, characterized in that: In the step of analyzing the fault feedback parameters and the electrical parameters to generate corresponding communication data, the fault feedback parameters include leakage feedback parameters, current feedback parameters and temperature feedback parameters, including: According to the leakage parameter comparison result between the leakage feedback parameter and the leakage monitoring parameter, it is judged whether there is cable leakage, and if so, the corresponding leakage point is determined based on the leakage parameter comparison result; According to the current parameter comparison result between the current feedback parameter and the current monitoring parameter, judging whether there is a power supply abnormality, and if so, determining the corresponding abnormality type based on the current gradient difference corresponding to the current parameter comparison result; Determining a corresponding over-temperature region according to a temperature parameter comparison result between the temperature feedback parameter and the temperature monitoring parameter; Integrate and transform the leakage point, the abnormal type and / or the over-temperature area to generate corresponding protocol standardization data, and generate corresponding communication data according to the request sending order and the protocol standardization data.

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