A monitoring system and method for safety of high-voltage transmission of induced polarization

Abstract

The application discloses a kind of monitoring system and method for safety of induced electric high voltage launch, it is related to geophysical exploration instrument technical field, the system includes: data acquisition module, DC relay, control module and monitoring end;Data acquisition module, DC relay and monitoring end are connected with control module;Data acquisition module is used to calculate the ground resistance in the induced electric launch loop of target induced electric transmitter in real time, and the ground resistance of real-time calculation is sent to control module;Control module is used to send the ground resistance received in real time to monitoring end, and when ground resistance is greater than set resistance threshold, the DC bus voltage of target induced electric transmitter is disconnected by controlling DC relay, and open-circuit fault information is sent to monitoring end by wireless communication.The application realizes the real-time safety monitoring of high induced electric transmitter, and improves production safety.

Description

Technical Field

[0001] This application relates to the field of geophysical exploration instrument technology, and in particular to a monitoring system and method for the safety of induced polarization high-voltage transmission. Background Technology

[0002] In the search for metal sulfide minerals, induced polarization (IP) is irreplaceable. Currently, mineral exploration at depths greater than 300 meters requires 60-180 kW IPI transmitters with a maximum transmission voltage of 3000V. This necessitates laying 10-20 km of power lines; with approximately 200 joints (each 100 meters long), these joints are prone to leakage, affecting data acquisition quality. Power lines often pass through mountainous, forested, and pastoral areas, where animals like cattle, horses, sheep, and rabbits may chew through them. High-power IPI work, with its high voltage and current transmission, poses significant safety hazards to personnel and livestock. Operating mines generally have strained relationships with local communities, leading to stringent safety requirements. Environmental, Social, and Governance (ESG) ratings for mines place extremely stringent requirements on safety, making safety the bottom line and the cornerstone of mine development. If people or livestock are electrocuted, it will affect people's property safety. Conventional constant voltage and constant current induced polarization transmitters do not have leakage and short circuit protection systems, and do not have real-time safety monitoring, so they cannot guarantee personnel safety. Summary of the Invention

[0003] The purpose of this application is to provide a monitoring system and method for the safety of induced polarization (IP) high-voltage emission, which realizes real-time safety monitoring of IPI and improves production safety.

[0004] To achieve the above objectives, this application provides the following solution:

[0005] In a first aspect, this application provides a monitoring system for the safety of induced polarization high-voltage transmission, comprising: a data acquisition module, a DC relay, a control module, and a monitoring terminal; wherein the data acquisition module, the DC relay, and the monitoring terminal are all connected to the control module;

[0006] The data acquisition module is used to calculate the grounding resistance in the induced emission circuit of the target induced emission transmitter in real time, and send the real-time calculated grounding resistance to the control module.

[0007] The control module is used to send the real-time received grounding resistance to the monitoring terminal, and when the grounding resistance is greater than the set resistance threshold, it controls the DC relay to disconnect the DC bus voltage of the target induced polarization transmitter and sends open circuit fault information to the monitoring terminal via wireless communication.

[0008] Optionally, the data acquisition module includes an isolation current and voltage sampling unit and a grounding resistance calculation unit;

[0009] The isolation current and voltage sampling unit is used to collect the transmission voltage and circuit current of the transmission circuit of the target induced polarization transmitter;

[0010] The grounding resistance calculation unit is used to calculate the grounding resistance based on the transmission voltage and loop current collected by the isolation current and voltage sampling unit.

[0011] Optionally, the data acquisition module further includes a synchronous acquisition unit, which is used to synchronously acquire the input voltage, input current, output voltage and output current of the DC relay according to a set sampling frequency, and send the input voltage, input current, output voltage and output current to the control module in real time.

[0012] Optionally, the control module is further configured to:

[0013] When the fluctuation of the grounding resistance exceeds the set fluctuation value, leakage fault information is sent to the monitoring terminal via wireless communication.

[0014] When the input voltage exceeds the first set safe voltage threshold, input overvoltage information is sent to the monitoring terminal via wireless communication.

[0015] When the input current exceeds the first set current threshold, input overcurrent information is sent to the monitoring terminal via wireless communication.

[0016] When the output voltage exceeds the second set safe voltage threshold, output overvoltage information is sent to the monitoring terminal via wireless communication.

[0017] When the input current exceeds the second set current threshold, output overcurrent information is sent to the monitoring terminal via wireless communication.

[0018] Optionally, the data acquisition module includes a 24-bit analog-to-digital converter (ADC), which is used to convert the analog signals of the input voltage, input current, output voltage, and output current acquired by the synchronous acquisition unit into digital signals.

[0019] Optionally, the monitoring terminal is used to input the set resistance threshold, and the monitoring terminal is also used to send a disconnect command to the control module. After receiving the disconnect command, the control module controls the DC relay to disconnect the DC bus voltage of the target induced polarization transmitter.

[0020] Optionally, the monitoring terminal includes a tablet computer and an LCD screen, both of which are used to display the grounding resistance.

[0021] Optionally, the target induced polarization transmitter is a constant voltage transmitter or a constant current transmitter.

[0022] Optionally, the control module employs an FPGA.

[0023] Secondly, this application provides a monitoring method for induced voltage emission safety, wherein the monitoring method for induced voltage emission safety applies the aforementioned monitoring system for induced voltage emission safety, and the monitoring method for induced voltage emission safety includes:

[0024] The data acquisition module calculates the grounding resistance in the induced emission circuit of the target induced emission transmitter in real time and sends the calculated grounding resistance to the control module.

[0025] The control module sends the received grounding resistance to the monitoring terminal in real time, and when the grounding resistance is greater than the set resistance threshold, it disconnects the DC bus voltage of the target induced polarization transmitter by controlling the DC relay, and sends open circuit fault information to the monitoring terminal via wireless communication.

[0026] According to the specific embodiments provided in this application, the following technical effects are disclosed:

[0027] This application provides a monitoring system and method for the safety of induced polarized high-voltage transmitters. A data acquisition module calculates the grounding resistance in the induced polarized transmitter circuit of the target transmitter in real time and sends the calculated grounding resistance to the control module. The control module sends the received grounding resistance to the monitoring terminal, and when the grounding resistance exceeds a set resistance threshold, it controls a DC relay to disconnect the DC bus voltage of the target transmitter. It then sends open-circuit fault information to the monitoring terminal via wireless communication. Through real-time data acquisition and transmission, and automatic control of the target transmitter by the control terminal, real-time safety monitoring of the high-voltage transmitter is achieved, improving production safety. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a monitoring system for induced polarization high voltage emission safety provided in an embodiment of this application.

[0030] Figure 2 This is a schematic diagram of a specific structure of a monitoring system for induced polarization high voltage emission safety provided in an embodiment of this application.

[0031] Figure 3 This is a schematic diagram of the working process of a monitoring system for induced polarization high voltage emission safety provided in an embodiment of this application.

[0032] Figure 4 This is a schematic diagram illustrating an example of an error code provided in an embodiment of this application. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] In one exemplary embodiment, a monitoring system for induced voltage (EV) transmission safety, such as Figures 1-2 As shown, the monitoring system for induced polarized high-voltage transmitter safety includes: a data acquisition module, a DC relay, a control module, and a monitoring terminal; the DC relay is used to control the on / off state of the target induced polarized transmitter; the data acquisition module, the DC relay, and the monitoring terminal are all connected to the control module.

[0036] The data acquisition module is used to calculate the grounding resistance in the induced emission circuit of the target induced emission transmitter in real time, and send the calculated grounding resistance to the control module.

[0037] The control module is used to send the real-time received grounding resistance to the monitoring terminal, and when the grounding resistance is greater than the set resistance threshold, it controls the DC relay to disconnect the DC bus voltage of the target induced polarization transmitter, and sends open circuit fault information to the monitoring terminal through wireless communication to protect personnel safety.

[0038] This application determines leakage, open circuit, and short circuit conditions based on the magnitude and stability of the grounding resistance. A calculated grounding resistance of less than 1 ohm is considered a short circuit.

[0039] The DC relay is specifically a high-voltage DC relay, and more specifically a high-voltage ceramic vacuum DC relay. The monitoring system for induced high-voltage emission safety also includes a driver for the DC relay, which is connected to the control module.

[0040] This application monitors safety hazards in induced polarization (IP) exploration, such as leakage, short circuits, human-caused damage, and electric shock caused by animals damaging the transmitter wires, thereby improving data acquisition quality and operational safety. Simultaneously, the use of a tablet computer for human-computer interaction enhances the flexibility of controlling the target IPC transmitter.

[0041] The duty cycle of the induced emission waveform of the target induced emission transmitter is 50%, and the period of the induced emission waveform is 8 seconds, 16 seconds, 32 seconds or 64 seconds.

[0042] The data acquisition module includes an isolation current and voltage sampling unit, as well as a grounding resistance calculation unit.

[0043] The isolated current and voltage sampling unit is used to collect the transmission voltage and circuit current of the transmission circuit of the target induced polarized transmitter. Specifically, the isolated current and voltage sampling unit collects the voltage (transmission voltage) and current (circuit current) under forward and reverse power supply conditions.

[0044] The grounding resistance calculation unit is used to calculate the grounding resistance based on the transmission voltage and loop current collected by the isolation current and voltage sampling unit. Grounding resistance = transmission voltage ÷ loop current.

[0045] This application determines the status of the transmitting circuit based on changes in grounding resistance and controls the high-voltage vacuum relay. Passive measurement of the circuit grounding resistance does not affect the transmitting circuit or the data acquisition of the induced polarization receiver.

[0046] The data acquisition module further includes a synchronous acquisition unit, which is used to synchronously acquire the input voltage, input current, output voltage, and output current of the DC relay according to a set sampling frequency, and send the input voltage, input current, output voltage, and output current to the control module in real time. The sampling frequency is set to 1000Hz.

[0047] The control module is also used to determine the condition of the DC relay based on the collected input voltage, input current, output voltage, and output current, and to send error codes to the monitoring terminal. The relevant error codes include... Figure 4 As shown. Specifically, it includes the following aspects.

[0048] (1) When the grounding resistance is greater than the set resistance threshold, the DC bus voltage of the target induced polarization transmitter is disconnected by controlling the DC relay, and an open circuit fault information is sent to the monitoring terminal via wireless communication. The open circuit fault information is represented by error code 01.

[0049] (2) When the fluctuation of the grounding resistance is greater than the set fluctuation value, the leakage fault information is sent to the monitoring terminal through wireless communication. The leakage fault information is represented by error code 02, and the tablet computer displays error code 02.

[0050] (3) When the input voltage is greater than the first set safe voltage threshold, the input overvoltage information is sent to the monitoring terminal via wireless communication. The input overvoltage is represented by error code 03.

[0051] (4) When the input current is greater than the first set current threshold, the input overcurrent information is sent to the monitoring terminal via wireless communication. The input current is represented by error code 04.

[0052] (5) When the output voltage is greater than the second set safety voltage threshold, the output overvoltage information is sent to the monitoring terminal via wireless communication. The output overvoltage is represented by error code 05.

[0053] (6) When the input current is greater than the second set current threshold, the output overcurrent information is sent to the monitoring terminal via wireless communication. The output overcurrent is represented by error code 06.

[0054] (7) When the high voltage DC relay fails to engage or disengage normally, the system will report a high voltage DC relay fault. The high voltage DC relay fault is indicated by error code 07.

[0055] (8) When data communication between internal modules is interrupted or the signal is abnormal, the system determines that there is a communication error and the tablet computer displays error code 08, that is, communication error is represented by error code 08.

[0056] (9) When a manual shutdown command is detected, the system enters the manual shutdown state, and the manual shutdown uses error code 09.

[0057] The data acquisition module includes a 24-bit analog-to-digital converter (ADC), which is used to convert the analog signals of the input voltage, input current, output voltage, and output current acquired by the synchronous acquisition unit into digital signals.

[0058] The monitoring terminal is used to input the set resistance threshold. The monitoring terminal is also used to send a disconnect command to the control module. After receiving the disconnect command, the control module controls the DC relay to disconnect the DC bus voltage of the target induced polarization transmitter.

[0059] The monitoring terminal includes a tablet computer and an LCD screen, both of which are used to display the grounding resistance.

[0060] Through a monitoring device, such as a tablet computer, the transmission current and grounding resistance can be monitored in real time. The tablet computer can be used to intervene and actively stop the transmission at any time. Wireless control eliminates the need to touch the transmitter, ensuring the safety of the transmitter operator.

[0061] This application utilizes a tablet computer for monitoring and operation via Wi-Fi, employing wireless communication to isolate high-voltage equipment and ensure personnel safety. The tablet computer is used to set parameters such as trigger thresholds, preventing the normal, gradual changes in grounding resistance under different terrains and topography from affecting transmission.

[0062] The target induced polarization transmitter is a constant voltage transmitter or a constant current transmitter.

[0063] The control module includes a main control unit (FPGA) and an embedded controller (MCU). The FPGA is a parallel processor that synchronously acquires input and output current and voltage. The embedded controller is a serial processor that handles communication and data storage.

[0064] The monitoring system for induced polarization high-voltage emission safety in this application also includes a data storage device, a GPS timing and positioning unit, a data acquisition module (voltage and current acquisition module), and a WIFI module. The data storage device uses an SD card.

[0065] The FPGA uses Altera Cyclone series fourth-generation product, model EP4CE10F17C8N, which has advantages such as low power consumption, high performance, abundant resources, and ease of use. It adopts a 256-pin ball grid array (BGA) package.

[0066] The FPGA serves as the central hub of the entire system, configuring various peripherals. It controls the 24-bit analog-to-digital converter via SPI communication, configures and receives GPS information via USART communication, communicates with the GPS timing and positioning unit and the WIFI module via USART communication, controls the high-voltage DC relay via an isolation drive circuit, controls the LCD display via a parallel interface, and sends the collected data to the embedded controller via USART communication. The embedded controller then uses SDIO to collect the data to a high-capacity SD card.

[0067] The ADS1274 is the core chip of the analog-to-digital converter module. It has multiple operating modes and a maximum sampling rate of 128kSPS to meet the requirements of high-speed dynamic signal acquisition. It communicates with the main control FPGA via SPI. The default sampling rate of the acquisition board is 52kSPS after power-on. Its operating mode can be modified on the WIFI tablet to set its sampling rate in real time. The acquisition board continuously outputs the acquired data.

[0068] The GPS timing and positioning unit uses an ATK-S1216F8-BD chip, which communicates with the main control unit FPGA via USART. The GPS positioning data output by the GPS positioning unit adopts the NMEA-0183 protocol, and the control protocol is the SkyTraq protocol. The FPGA receives NMEA protocol data transmitted via serial port and decodes the satellite positioning information, including UTM date and time, latitude and longitude coordinates, elevation, and number of GPS satellites. The FPGA can also set the GPS sampling rate, baud rate, and output information via the SkyTraq control protocol. Simultaneously, parameters such as the sampling rate and baud rate can be modified in real time on a Wi-Fi tablet. The default baud rate is 9600, with 1 stop bit, 8 data bits, and no parity bit.

[0069] The embedded controller is an embedded system based on an STM32 microcontroller (GD32F103ZET6). It connects to the FPGA via USART1 and has an internal FATFS file system. It also connects to the SD card via a Secure Digital Input and Output (SDIO) interface, using a 4-wire SDIO driver mode. Data written to the SD card uses DMA transfer mode to reduce CPU usage. Data received from the serial port is sorted into time-series files and stored as TXT documents on a large-capacity SD card. The storage interval is 1 second per data set. The stored data includes: the current location time, latitude and longitude, instrument serial number, working status of each module in the system, collected current and voltage values, safety status and automatic fault diagnosis data, module running time, number of times the instrument has been powered on, and calculated grounding resistance value.

[0070] The 24-bit analog-to-digital converter unit uses the Texas Instruments ADS1274 24-bit analog-to-digital converter chip. The GPS timing and positioning unit uses a GPS + Beidou dual-mode positioning module. The SD card has a capacity of 32G. The LCD screen has a resolution of 320*240. The high-voltage DC relay is model JPK-2. The core chip of the data acquisition module is ACS724. The core chip of the WIFI module is ESP8266.

[0071] The LCD screen is used to display the system's operating status and information. After the system is powered on, the LCD will display the instrument serial number; the number of available GPS and BeiDou satellites, latitude, longitude, altitude, and UTC time; the parameters set for each module; the total capacity of the SD card, the used space, and the remaining space; the voltage, current, and resistance values ​​currently being acquired; the system's operating time, safety status, and the cause of any errors automatically diagnosed.

[0072] The high-voltage DC relay uses the JPK-2 relay, with a rated operating voltage of 12kV and a maximum carrying current of 30A. Its contact resistance is ≤0.025Ω, and insulation resistance is ≥10GΩ. It employs a ceramic-sealed housing and has a 5-pin physical interface (common / normally open / normally closed / coil+ / coil-), connected to the main control unit FPGA for control via an isolated drive circuit.

[0073] The core chip of the data acquisition module is the ACS724, a high-precision current sensor based on the Hall effect principle. It has a measurement range of -50A to 50A and a measurement accuracy of 40mV / A. Its VIOUT pin is connected to the analog-to-digital converter module, and the main control unit calculates the current value by reading the voltage value from the analog-to-digital converter module.

[0074] The core chip of the WIFI module is the ESP8266. The main control unit FPGA communicates with it via USART at a baud rate of 115200bps, with a data format of 8 data bits, 1 stop bit, and no parity bit. The WIFI module connects to the remote tablet wirelessly. Through communication with the WIFI module, the main control unit FPGA allows the remote tablet to control the parameter status of the main control FPGA, thereby enabling the use of wireless communication to isolate high-voltage equipment and protect personnel safety.

[0075] This application discloses a monitoring system for induced polarization high-voltage transmission safety, which also includes a power supply module. The power supply module is used to provide digital 3.3V, 5V and 15V voltages, and to provide ±5V and ±15V to the operational amplifier. An isolated power supply module is used to reduce ripple and eliminate common-mode interference.

[0076] The power module uses a 12V lithium battery and needs to provide ±15V and ±5V voltages to the operational amplifiers, using rail-to-rail op-amps. The ±15V and ±5V voltages are for analog circuits and require low noise; the 12V lithium battery to 15V voltage is a boost converter, so a DC-DC module is used. Low-dropout regulators (LDOs) are used to provide 5V and 3.3V to the digital circuits; their low ripple makes them suitable for digital circuits with low differential voltage and low power.

[0077] like Figure 3 As shown, the workflow of a monitoring system for induced polarization high-voltage transmission safety according to this application includes the following steps.

[0078] Step 1. Connect the wires to the power supply line measuring terminal and connect the high-voltage DC relay according to the specifications.

[0079] Step 2. Connect the GPS antenna to the system and power on the system.

[0080] Step 3. After setting the parameters of each module via the WIFI tablet, the system will perform a self-test and begin working.

[0081] Step 4. If an error occurs, the system will perform automatic fault diagnosis, send an error code to the WIFI tablet, and simultaneously control the relay to physically disconnect the switch.

[0082] Step 5. If no errors are sent, the tablet will display the setting parameters, measurement values, and waveforms in real time.

[0083] Step 6. After the system finishes working, remove the SD card and read the historical measurement values.

[0084] This application passively measures grounding resistance without affecting the normal operation of the target induced polarized transmitter. Safety monitoring begins when the transmission voltage exceeds the safe voltage of 36V. Based on the transmission voltage and circuit current, the grounding resistance is calculated to determine open circuits, short circuits, and leakage. It can mechanically shut off a DC bus voltage of up to 3000V, physically isolating the input and output. It can promptly detect human sabotage, such as cattle, horses, or sheep biting through the power supply line causing an open circuit in the transmission circuit, automatically shutting off the high-voltage transmission output to prevent accidents involving personnel and livestock. It can also promptly detect localized leakage caused by rain and humidity, ensuring the collection of effective data. The transmission waveform can be viewed in real time via tablet or mobile phone, and the transmission can be wirelessly shut down in case of emergencies, ensuring safe production and possessing high practical value.

[0085] Compared with existing induced polarization high-voltage emission safety monitoring systems, the advantages of this application are:

[0086] (1) High data detection accuracy and high real-time performance.

[0087] Existing technologies: Traditional systems mostly use MCU single-core processing, with low sampling rate, and timing conflicts are prone to occur when multiple channels are acquired synchronously; the analog-to-digital conversion bit depth is low (below 16 bits), and the ability to identify minute current changes is insufficient; the fault response delay is >50ms, which cannot meet the requirements for rapid shutdown of high voltage transient faults.

[0088] This application uses an FPGA as the main control unit, which achieves high execution speed through parallel processing. It is also equipped with a 24-bit AD chip, enabling simultaneous data acquisition from four channels. Data is transmitted to the main control unit via SPI communication, resulting in a high sampling rate and high precision. Furthermore, it communicates with a WIFI module via USART, allowing for real-time and rapid adjustment of measurement parameters, achieving low latency.

[0089] (2) Simple and convenient to operate.

[0090] Existing technology: Traditional systems rely on PC-based configuration software, and deployment requires specialized geophysical personnel; hardware connections are complex, and operating efficiency is low.

[0091] This application is simple to operate and does not require professionally trained geophysical engineers. Simply connect the GPS antenna and the measuring end, and it will automatically collect data upon power-on. Geophysical support personnel can quickly deploy an induced polarization (IP) high-voltage emission safety monitoring system to carry out IPI work, which is low-cost and highly efficient.

[0092] (3) Automatic fault diagnosis and high safety.

[0093] Existing technology: Traditional systems rely on a single mechanical relay for electrical isolation, with an action delay of >20ms, a high risk of electric arc, and the inability to determine the cause of the fault, requiring further manual inspection.

[0094] This application employs a magnetically latched high-voltage relay, achieving complete electrical isolation between the input and output terminals through mechanical contacts, physically cutting off the current path, thus ensuring high safety. Simultaneously, it automatically detects the cause of faults based on the collected input voltage, input current, output voltage, output current, and the status of various sensors.

[0095] (4) The data is intuitive and easy to understand, and highly operable.

[0096] Existing technology: Traditional system data is stored as raw binary data, which requires specialized software for parsing; visualization relies on post-processing and provides weak support for on-site decision-making.

[0097] This application sends the data collected by the main control unit FPGA to the embedded controller via USART communication. The embedded controller builds a FATFS file system to store the collected grounding resistance, input voltage, input current, output voltage, output current, and the status of each sensor to an SD card, sorts them according to time series files, and provides strong data visualization and controllable quality in post-processing.

[0098] Based on the same inventive concept, this application also provides a monitoring method for induced voltage (EV) emission safety, used to implement the aforementioned monitoring system for EV emission safety. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more embodiments of the monitoring method for EV emission safety provided below can be found in the limitations of the monitoring system for EV emission safety described above, and will not be repeated here.

[0099] In an exemplary embodiment, a monitoring method for induced voltage emission safety is provided, the monitoring method for induced voltage emission safety applies the monitoring system for induced voltage emission safety, and the monitoring method for induced voltage emission safety includes steps 101-102.

[0100] Step 101: The data acquisition module calculates the grounding resistance in the induced emission circuit of the target induced emission transmitter in real time and sends the calculated grounding resistance to the control module.

[0101] Step 102: The control module sends the real-time received grounding resistance to the monitoring terminal, and when the grounding resistance is greater than the set resistance threshold, it disconnects the DC bus voltage of the target induced polarization transmitter by controlling the DC relay, and sends open circuit fault information to the monitoring terminal via wireless communication.

[0102] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A monitoring system for the safety of induced polarized high-voltage transmission, characterized in that, The monitoring system for induced polarization high-voltage emission safety includes: a data acquisition module, a DC relay, a control module, and a monitoring terminal; the data acquisition module, the DC relay, and the monitoring terminal are all connected to the control module. The data acquisition module is used to calculate the grounding resistance in the induced emission circuit of the target induced emission transmitter in real time, and send the real-time calculated grounding resistance to the control module. The control module is used to send the real-time received grounding resistance to the monitoring terminal, and when the grounding resistance is greater than the set resistance threshold, it controls the DC relay to disconnect the DC bus voltage of the target induced polarization transmitter and sends open circuit fault information to the monitoring terminal via wireless communication. The data acquisition module includes an isolation current and voltage sampling unit, and a grounding resistance calculation unit; The isolation current and voltage sampling unit is used to collect the transmission voltage and circuit current of the transmission circuit of the target induced polarization transmitter; The grounding resistance calculation unit is used to calculate the grounding resistance based on the transmitted voltage and loop current collected by the isolation current and voltage sampling unit; The data acquisition module further includes a synchronous acquisition unit, which is used to synchronously acquire the input voltage, input current, output voltage and output current of the DC relay according to a set sampling frequency, and send the input voltage, input current and output voltage and output current to the control module in real time; The control module is also used for: When the fluctuation of the grounding resistance exceeds the set fluctuation value, leakage fault information is sent to the monitoring terminal via wireless communication. When the input voltage exceeds the first set safe voltage threshold, input overvoltage information is sent to the monitoring terminal via wireless communication. When the input current exceeds the first set current threshold, input overcurrent information is sent to the monitoring terminal via wireless communication. When the output voltage exceeds the second preset safe voltage threshold, output overvoltage information is sent to the monitoring terminal via wireless communication. When the input current exceeds the second set current threshold, output overcurrent information is sent to the monitoring terminal via wireless communication. The control module includes a main control unit FPGA and an embedded controller; the main control unit FPGA is a parallel processor that synchronously acquires input current, output current, input voltage, and output voltage; the embedded controller is a serial processor that is responsible for communication and data storage. The monitoring terminal is used to input the set resistance threshold. The monitoring terminal is also used to send a disconnect command to the control module. After receiving the disconnect command, the control module controls the DC relay to disconnect the DC bus voltage of the target induced polarization transmitter.

2. The monitoring system for induced polarization high-voltage transmission safety according to claim 1, characterized in that, The data acquisition module includes a 24-bit analog-to-digital converter (ADC), which is used to convert the analog signals of the input voltage, input current, output voltage, and output current acquired by the synchronous acquisition unit into digital signals.

3. The monitoring system for induced polarization high-voltage transmission safety according to claim 1, characterized in that, The monitoring terminal includes a tablet computer and an LCD screen, both of which are used to display the grounding resistance.

4. The monitoring system for induced polarization high-voltage transmission safety according to claim 1, characterized in that, The target induced polarization transmitter is a constant voltage transmitter or a constant current transmitter.

5. A monitoring method for the safety of induced polarized high-voltage transmission, characterized in that, The monitoring method for induced voltage emission safety applies the monitoring system for induced voltage emission safety according to any one of claims 1-4, and the monitoring method for induced voltage emission safety includes: The data acquisition module calculates the grounding resistance in the induced emission circuit of the target induced emission transmitter in real time and sends the calculated grounding resistance to the control module. The control module sends the received grounding resistance to the monitoring terminal in real time, and when the grounding resistance is greater than the set resistance threshold, it disconnects the DC bus voltage of the target induced polarization transmitter by controlling the DC relay, and sends open circuit fault information to the monitoring terminal via wireless communication.

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