Gas leakage monitoring system for gas chamber of gas insulated switchgear

Abstract

The invention relates to a gas leakage monitoring system for a gas chamber of gas insulated switchgear. The system comprises a gas sensor module, an environment sensor module, a main control unit, a display screen, a WIFI wireless communication module and an upper computer, the main control unit is used for acquiring gas concentration data around the gas chamber of the gas insulated switchgear and environmental data in the gas chamber of the gas insulated switchgear; the main control unit is also used for determining that the gas chamber of the gas insulated switchgear is in a gas leakage state under the condition that the gas concentration data meets the gas abnormal condition and the environment data meets the environment abnormal condition, and sending alarm information to an upper computer; and the display screen is used for displaying the gas concentration data, the environment data and the alarm information sent by the main control unit. By adopting the method, the gas leakage monitoring accuracy of the gas chamber of the gas insulated switchgear can be improved.

Description

Technical Field

[0001] This application relates to the technical field of power equipment monitoring, and particularly to a gas leakage monitoring system for a gas chamber of a gas-insulated switchgear. Background Art

[0002] Pure sulfur hexafluoride gas is colorless, odorless, non-flammable, and has particularly stable chemical properties at room temperature. It is more than five times the specific gravity of air. However, in the power system, since sulfur hexafluoride gas mainly acts as an insulating and arc-extinguishing medium, under the influence of factors such as electric arcs, partial discharges, and high temperatures, sulfur hexafluoride gas will decompose. Its decomposition products will generate corrosive electrolytes when encountering moisture, especially some highly toxic decomposition products, such as sulfur tetrafluoride, disulfur dioxide, sulfuryl fluoride, hydrogen fluoride, sulfur dioxide, etc. If inhaled in large amounts by the human body, it will cause dizziness and pulmonary edema, and even coma and death. In a relatively sealed room, due to poor air circulation, sulfur hexafluoride and its decomposition products accumulate indoors. Coupled with the fact that sulfur hexafluoride gas is colorless and odorless, it poses a great danger to inspection and maintenance personnel. For power equipment filled with sulfur hexafluoride, such as gas-insulated switchgear, when sulfur hexafluoride in the gas chamber of the gas-insulated switchgear leaks, the sulfur hexafluoride gas will accumulate in the lower space above the floor. When it reaches a certain concentration, if a staff member enters the room, it will cause cerebral hypoxia and suffocate people, resulting in major accidents. In traditional technologies, usually a single sulfur hexafluoride sensor is used to determine whether there is gas leakage in the gas chamber of the gas-insulated switchgear. However, this method has a low accuracy in monitoring gas leakage in the gas chamber of the gas-insulated switchgear. Summary of the Invention

[0003] Based on this, in view of the above technical problems, it is necessary to provide a gas leakage monitoring system for a gas chamber of a gas-insulated switchgear that can improve the accuracy of gas leakage monitoring in the gas chamber of the gas-insulated switchgear.

[0004] This application provides a gas leakage monitoring system for a gas chamber of a gas-insulated switchgear. The gas leakage monitoring system includes: a gas sensor module, an environmental sensor module, a main control unit, a display screen, a WIFI wireless communication module, and a host computer; the output ends of the gas sensor module and the environmental sensor module are respectively connected to the input end of the main control unit; the display screen is connected to the main control unit; the output end of the main control unit is connected to the host computer; the main control unit communicates with the host computer through the WIFI wireless communication module;

[0005] The master control unit is configured to obtain gas concentration data around the gas chamber of the gas-insulated switchgear and environmental data inside the gas chamber of the gas-insulated switchgear; the gas concentration data is determined based on gas sensor data collected by the gas sensor module, and the environmental data is determined based on environmental sensor data collected by the environmental sensor module;

[0006] The master control unit is further configured to, when the gas concentration data meets the gas anomaly condition and the environmental data meets the environmental anomaly condition, determine that the gas chamber of the gas-insulated switchgear is in a gas leakage state, and send an alarm message to the host computer;

[0007] The display screen is configured to display the gas concentration data, the environmental data, and the alarm message sent by the master control unit.

[0008] In one embodiment, the gas leakage monitoring system further includes a signal processing circuit, and the signal processing circuit is respectively connected to the gas sensor module and the master control unit;

[0009] The signal processing circuit is configured to convert the analog signal output by the gas sensor module into a digital signal;

[0010] The master control unit is configured to determine the gas concentration data around the gas chamber of the gas-insulated switchgear according to the digital signal.

[0011] In one embodiment, the signal processing circuit includes a sensor signal conditioning circuit and a sensor signal conversion circuit; the input end of the sensor signal conditioning circuit is connected to the output end of the gas sensor module, and the output end of the sensor signal conversion circuit is connected to the master control unit;

[0012] The sensor signal conditioning circuit is configured to perform signal conditioning processing and signal amplification processing on the analog signal output by the gas sensor module to obtain a standard voltage signal corresponding to the analog signal;

[0013] The sensor signal conversion circuit is configured to convert the standard voltage signal into a digital signal through an analog-to-digital converter chip, and transmit the digital signal to the master control unit through the SPI bus.

[0014] In one embodiment, the environmental sensor module includes a humidity sensor, a temperature sensor, and a pressure sensor;

[0015] The master control unit is configured to determine that the environmental data meets the environmental anomaly condition when at least one of the humidity data collected by the humidity sensor, the temperature data collected by the temperature sensor, and the pressure data collected by the pressure sensor does not meet the preset data range.

[0016] In one embodiment, the gas sensor module includes a sulfur hexafluoride sensor; the sulfur hexafluoride sensor is an infrared type sensor;

[0017] The sulfur hexafluoride sensor is configured to collect the intensity change amount of the infrared light corresponding to the wavelength absorbed by sulfur hexafluoride, and generate the gas concentration of sulfur hexafluoride according to the intensity change amount.

[0018] In one embodiment, the gas sensor module further includes an oxygen sensor and a hydrogen sensor; the oxygen sensor and the hydrogen sensor are electrochemical type sensors;

[0019] The oxygen sensor is configured to collect the electrical signal generated by the chemical reaction occurring between oxygen and the electrodes of the oxygen sensor, as the analog signal output by the gas sensor module;

[0020] The hydrogen sensor is configured to collect the electrical signal generated by the chemical reaction occurring between hydrogen and the electrodes of the hydrogen sensor, as the analog signal output by the gas sensor module.

[0021] In one embodiment, the main control unit is configured to determine that the gas concentration data meets the gas anomaly condition when at least one of the conditions that the gas concentration of sulfur hexafluoride is higher than the first concentration threshold, the gas concentration of oxygen is lower than the second concentration threshold, and the gas concentration of hydrogen is higher than the third concentration threshold is satisfied.

[0022] In one embodiment, the gas leakage monitoring system further includes a gas sensor adapter circuit board and a sensor protective cover; a gas sensor socket is fixed on the gas sensor adapter circuit board, and the gas sensor module is inserted into the gas sensor socket; the gas sensor adapter circuit board is fixed in the sensor protective cover and is connected to the signal processing circuit through an adapter board wiring harness.

[0023] In one embodiment, the main control unit is configured to send the gas concentration data, the environmental data, and the alarm information to the host computer through a USB serial port.

[0024] In one embodiment, the main control unit is configured to send the gas concentration data and the environmental data to the cloud platform through the WIFI wireless communication module.

[0025] The above-mentioned gas leakage monitoring system for the gas chamber of a gas-insulated switchgear includes a gas sensor module, an environmental sensor module, a main control unit, a display screen, a WIFI wireless communication module, and a host computer; the output ends of the gas sensor module and the environmental sensor module are respectively connected to the input end of the main control unit; the display screen is connected to the main control unit; the output end of the main control unit is connected to the host computer; the main control unit communicates with the host computer through the WIFI wireless communication module; the main control unit is used to obtain the gas concentration data around the gas chamber of the gas-insulated switchgear and the environmental data inside the gas chamber of the gas-insulated switchgear, wherein the gas concentration data is determined according to the gas sensor data collected by the gas sensor module, and the environmental data is determined according to the environmental sensor data collected by the environmental sensor module; the main control unit is further used to determine that the gas chamber of the gas-insulated switchgear is in a gas leakage state and send an alarm message to the host computer when the gas concentration data meets the gas anomaly condition and the environmental data meets the environmental anomaly condition; the display screen is used to display the gas concentration data, environmental data, and alarm message sent by the main control unit. By combining the gas sensor module and the environmental sensor module, the gas concentration data and environmental data around the gas chamber of the gas-insulated switchgear can be monitored in real time. Through the comprehensive analysis of the multi-sensor fusion data by the main control unit, it is possible to more accurately judge whether there is a gas leakage state, improving the accuracy of gas leakage monitoring for the gas chamber of the gas-insulated switchgear; the connection between the main control unit and the host computer can send an alarm message to the host computer in time when a leakage occurs, realizing the functions of remote monitoring and alarming, and the monitoring data and alarm status are displayed in real time through the display screen, which can intuitively and real-time display the status of the gas chamber of the gas-insulated switchgear, improving the accuracy, efficiency, and reliability of gas leakage monitoring for the gas chamber of the gas-insulated switchgear. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a structural block diagram of a gas leakage monitoring system for the gas chamber of a gas-insulated switchgear in an embodiment;

[0028] Figure 2 It is a structural schematic diagram of a gas leakage monitor for a GIS gas chamber in an embodiment;

[0029] Figure 3 It is a gas leakage monitoring system for the gas chamber of a gas-insulated switchgear in another embodiment;

[0030] Figure 4 Schematic diagram of the structure of a switch control circuit in an embodiment;

[0031] Figure 5 Working logic diagram of a gas leakage monitoring system in an embodiment. Detailed implementation manners

[0032] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] In an exemplary embodiment, as Figure 1 shown, a structural block diagram of a gas leakage monitoring system for a gas chamber of a gas-insulated switchgear is provided. The gas leakage monitoring system 100 includes: a gas sensor module 101, an environmental sensor module 102, a main control unit 103, a display screen 104, a WIFI wireless communication module 106, and a host computer 105; the output ends of the gas sensor module 101 and the environmental sensor module 102 are respectively connected to the input end of the main control unit 103; the display screen 104 is connected to the main control unit 103; the output end of the main control unit 103 is connected to the host computer 105; the main control unit 103 communicates with the host computer 105 through the WIFI wireless communication module 106;

[0034] The main control unit 103 is configured to obtain gas concentration data around the gas chamber of the gas-insulated switchgear and environmental data inside the gas chamber of the gas-insulated switchgear; the gas concentration data is determined according to gas sensor data collected by the gas sensor module 101, and the environmental data is determined according to environmental sensor data collected by the environmental sensor module 102;

[0035] The main control unit 103 is further configured to determine that the gas chamber of the gas-insulated switchgear is in a gas leakage state and send an alarm message to the host computer 105 when the gas concentration data meets the gas anomaly condition and the environmental data meets the environmental anomaly condition;

[0036] The display screen 104 is configured to display the gas concentration data, environmental data, and alarm message sent by the main control unit 103.

[0037] Among them, the gas-insulated switchgear is also known as GIS equipment. The gas-insulated switchgear belongs to the circuit device for power supply or distribution. The gas-insulated switchgear is a switching device used for high-voltage power transmission and distribution in the power system. It realizes the insulation and arc-extinguishing functions by encapsulating high-voltage electrical components (such as circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers, etc.) in a metal shell and filling it with insulating gas (usually sulfur hexafluoride SF6). The gas-insulated switchgear is usually used in substations or distribution systems, mainly for controlling and protecting the normal operation of the power system. Therefore, it is an important part of the power supply or distribution circuit. The gas chamber of the gas-insulated switchgear can be called the GIS chamber. The gas chamber of the gas-insulated switchgear can refer to the enclosed space in the gas-insulated switchgear for containing high-voltage insulating gas (such as sulfur hexafluoride SF6), mainly for providing high insulation performance and arc-extinguishing function. The tightness of the gas chamber of the gas-insulated switchgear is an important guarantee for the safe operation of the gas-insulated switchgear. Once the gas chamber leaks, it may affect the insulation performance and endanger the safe operation of the equipment.

[0038] Among them, the gas sensor module can be a sensor module for detecting the concentration change of specific gases (such as sulfur hexafluoride gas, oxygen, hydrogen, etc.), and can include a variety of gas sensors for detecting different gases, such as sulfur hexafluoride sensors, oxygen sensors, hydrogen sensors, etc. Optionally, the gas sensor module can include a variety of gas sensors based on different principles, such as infrared gas sensors, electrochemical gas sensors.

[0039] Among them, the environmental sensor module can be a sensor module for detecting the environmental parameters around the gas chamber, and can include multiple environmental sensors for detecting different environmental parameters, such as temperature sensors, pressure sensors, humidity sensors, etc. Among them, the temperature sensor and the humidity sensor can be connected to the main control unit through the I²C (Inter-Integrated Circuit) interface.

[0040] In practical applications, the gas-insulated switchgear is generally installed in the switch room. The gas sensor module and the environmental sensor module can collect the gas sensor data and environmental sensor data in the switch room, that is, the gas sensor data and environmental sensor data around the gas chamber of the gas-insulated switchgear.

[0041] Among them, the main control unit can be the processor of the gas leakage monitoring system, responsible for collecting the output data of the sensor module, processing and analyzing it, and finally outputting the result. The main control unit can be an embedded controller. For example, the STM32F103ZET6 microcontroller. This main control unit has low energy consumption, strong functions, low cost, and rich I / O ports, which can meet the requirements of the system and control costs.

[0042] Optionally, the main control unit can support the connection of up to 4 sensors, including gas sensors and pressure sensors, and these sensors are designed separately from the main control unit.

[0043] The host computer can be a local computer or control terminal connected to the main control unit, which is used to receive, process and display the data sent by the main control unit. Optionally, the host computer can receive real-time data sent by the gas leakage monitoring system, parse, store and analyze it, and generate reports or charts; it can also configure, calibrate or control the parameters of the gas leakage monitoring system; when the main control unit determines that the gas chamber of the gas-insulated switchgear is in a gas leakage state, it can trigger a local alarm (such as a sound alarm, a pop-up window prompt, etc.).

[0044] In the specific implementation, in order to facilitate the visual reading of gas concentration data, a display screen can be set in the gas leakage monitoring system, and the output end of the display screen is connected to the main control unit. The main control unit can display the gas concentration data and environmental data on the display screen. When the gas concentration data meets the gas abnormality conditions and the environmental data meets the environmental abnormality conditions, a red alarm sign and flashing can be displayed to prevent some sulfur hexafluoride remaining in the switch room from causing harm to personnel. At the same time, the main control unit can also display the concentration of the gas to be tested or the gas information index detected by other sensors in real time, so that personnel can know the working environment conditions in real time and take corresponding measures.

[0045] In one of the embodiments, the main control unit 103 is also used to control the data sampling frequency of the gas sensor module according to the change amplitude of the environmental data within a unit time period, so that the gas sensor module collects gas concentration data based on the data sampling frequency. Among them, the greater the change amplitude within a unit time period, the higher the data sampling frequency. Exemplarily, if the change amplitude within a unit time period is greater than the amplitude threshold, it means that the environmental data (such as temperature, humidity, etc.) fluctuates violently, and the data sampling frequency of the gas sensor module can be increased to improve the real-time performance of gas concentration data collection. Since the environmental sensor module has low power consumption, it can be first determined whether the data sampling frequency of the gas sensor module needs to be adjusted based on the environmental data collected by the environmental sensor module. Because the gas sensor module has high power consumption and high precision requirements, such a flexible adjustment process can save power consumption and improve gas monitoring efficiency.

[0046] In specific implementation, when the gas concentration data meets the gas anomaly condition and the environmental data meets the environmental anomaly condition, the main control unit determines that the gas-insulated switchgear compartment is in a gas leakage state. It can be determined that the sulfur hexafluoride gas concentration around the gas-insulated switchgear compartment exceeds a certain concentration threshold or the oxygen gas concentration is lower than a certain concentration threshold (there is an oxygen-deficient state) based on the gas concentration data, and when it is determined that the environmental data (such as pressure, humidity, or temperature) in the gas-insulated switchgear compartment exceeds the preset normal range based on the environmental data, it can be determined that the gas-insulated switchgear compartment is in a gas leakage state. Because when there is a gas leakage, the environment around the gas-insulated switchgear compartment will cause pressure changes due to the change in gas content; if a certain chemical reaction occurs to the gas, the humidity will also change; if the gas decomposes, the temperature of the compartment will also be abnormal. Through the comprehensive analysis method that combines gas concentration data and environmental data, the accuracy of leakage detection can be improved, and false alarms and missed alarms can be reduced.

[0047] As an example, when it is determined that the sulfur hexafluoride gas concentration around the gas-insulated switchgear compartment exceeds the first concentration threshold or the oxygen gas concentration is lower than the second concentration threshold (oxygen deficiency), regardless of whether the environmental data is abnormal, an alarm message can be sent to the host computer for real-time alarm. At the same time, the main control unit can store the data in the abnormal time period into the SD card to facilitate the staff to analyze the environmental changes and take certain measures.

[0048] As another example, when it is determined that the sulfur hexafluoride gas concentration around the gas-insulated switchgear compartment does not exceed the first concentration threshold or the oxygen gas concentration is not lower than the second concentration threshold, but the data fluctuation degree of the sulfur hexafluoride gas concentration and the oxygen gas concentration within a certain time period is relatively large, the environmental data can be combined to judge whether the gas-insulated switchgear compartment is in a gas leakage state. Assuming that the data fluctuation degree is large and the environmental data is abnormal, it can be determined that the gas-insulated switchgear compartment is in a gas leakage state.

[0049] In specific implementation, if the main control unit determines that the gas-insulated switchgear compartment is in a gas leakage state, it will send an alarm message to the host computer. Optionally, the alarm message can include the leakage concentration, environmental data, and specific location. The alarm message can also include the leakage level (slight, medium, severe), the predicted diffusion range of the leaked gas, and the recommended maintenance measures.

[0050] Exemplarily, the gas leakage monitoring system can be set in the GIS compartment leakage gas monitor as shown in Figure 2 the figure. Figure 2Exemplarily, a schematic structural diagram of a GIS gas chamber leakage gas monitor is provided. Exemplarily, the overall size of the GIS gas chamber leakage gas monitor can be 130mm * 75mm * 40mm. A thin film panel groove and a display screen groove are provided on the outer shell of the GIS gas chamber leakage gas monitor. Among them, the display screen is connected to the main control unit printed circuit board (PCB) through a flexible printed circuit (FPC) flexible cable. Screw holes are provided inside the outer shell for fixing internal components, and at the same time, screw holes for fixing the PCB board and a fixed card slot for installing the battery are also provided. The gas sensor module and the environmental sensor module are connected to the reserved ports on the PCB board, realizing the separate design of the sensor and the main control unit.

[0051] The above gas leakage monitoring system for the gas chamber of the gas-insulated switchgear includes a gas sensor module, an environmental sensor module, a main control unit, a display screen, and a host computer; the output ends of the gas sensor module and the environmental sensor module are respectively connected to the input end of the main control unit; the display screen is connected to the main control unit; the output end of the main control unit is connected to the host computer; the main control unit is used to obtain the gas concentration data around the gas chamber of the gas-insulated switchgear and the environmental data inside the gas chamber of the gas-insulated switchgear. Among them, the gas concentration data is determined according to the gas sensor data collected by the gas sensor module, and the environmental data is determined according to the environmental sensor data collected by the environmental sensor module; the main control unit is also used to determine that the gas chamber of the gas-insulated switchgear is in a gas leakage state and send an alarm message to the host computer when the gas concentration data meets the gas abnormality condition and the environmental data meets the environmental abnormality condition; the display screen is used to display the gas concentration data, environmental data, and alarm message sent by the main control unit. Through the combination of the gas sensor module and the environmental sensor module, the gas concentration data and environmental data around the gas chamber of the gas-insulated switchgear can be monitored in real time. Through the comprehensive analysis of the multi-sensor fusion data by the main control unit, it is possible to more accurately judge whether there is a gas leakage state, improving the accuracy of gas leakage monitoring for the gas chamber of the gas-insulated switchgear; the connection between the main control unit and the host computer can send an alarm message to the host computer in time when a leakage occurs, realizing the functions of remote monitoring and alarm, and the monitoring data and alarm status are displayed in real time through the display screen, which can intuitively and real-time display the status of the gas chamber of the gas-insulated switchgear, improving the accuracy, efficiency, and reliability of gas leakage monitoring for the gas chamber of the gas-insulated switchgear.

[0052] In another embodiment, the gas leakage monitoring system further includes a signal processing circuit, which is respectively connected to the gas sensor module and the main control unit; the signal processing circuit is used to convert the analog signal output by the gas sensor module into a digital signal; the main control unit is used to determine the gas concentration data around the gas chamber of the gas-insulated switchgear according to the digital signal.

[0053] Among them, the signal processing circuit may include an amplifier circuit, a filter circuit, and an analog-to-digital converter (ADC), which are used to convert the analog signal into a digital signal.

[0054] Among them, the analog signal can be a continuous signal (such as a voltage or current signal) output by the gas sensor module, and its magnitude is proportional to the gas concentration.

[0055] Among them, the digital signal can be a discrete signal after analog-to-digital conversion, represented in binary form, which is convenient for the main control unit to process.

[0056] In a specific implementation, the signal processing circuit can amplify the weak analog signal output by the gas sensor module through an operational amplifier to improve the signal-to-noise ratio of the signal; use a low-pass filter to remove high-frequency noise to ensure the stability of the signal; select an ADC chip with high resolution (such as 12-bit or 16-bit) to convert the amplified and filtered analog signal into a digital signal; and can also perform linearization processing on the non-linear signal to make it linearly related to the gas concentration.

[0057] In a specific implementation, the main control unit can receive the digital signal output by the signal processing circuit through the SPI or I²C interface, convert the digital signal into gas concentration data according to a preset algorithm (such as linear interpolation or polynomial fitting), and determine whether the gas concentration data meets the gas anomaly condition (such as the SF6 concentration exceeds 1000 ppm), and it can be determined that there is a gas leakage.

[0058] Optionally, the gas sensor module, the signal processing circuit, and the main control unit can be connected through a PCB board to ensure the stability of signal transmission.

[0059] The technical solution of this embodiment optimizes the signal acquisition and processing capabilities of the gas leakage monitoring system by adding a signal processing circuit, significantly improving the measurement accuracy, reliability, and response speed of the system. The signal processing circuit converts the analog signal output by the gas sensor module into a digital signal, and the main control unit calculates the gas concentration data according to the digital signal and performs anomaly judgment and alarm triggering. This design not only solves the problem of low monitoring accuracy caused by relying solely on gas sensors in traditional technologies, but also provides greater flexibility for the expansion and optimization of the system.

[0060] Based on the above gas leakage monitoring system, further, in another exemplary embodiment, such asFigure 3 As shown, a gas leakage monitoring system for a gas chamber of a gas-insulated switchgear is provided.

[0061] In another embodiment, the signal processing circuit 300 includes a sensor signal conditioning circuit 302 and a sensor signal conversion circuit 304; the input end of the sensor signal conditioning circuit 302 is connected to the output end of the gas sensor module 101, and the output end of the sensor signal conversion circuit 304 is connected to the main control unit 103; the sensor signal conditioning circuit 302 is used to perform signal conditioning processing and signal amplification processing on the analog signal output by the gas sensor module 101 to obtain a standard voltage signal corresponding to the analog signal; the sensor signal conversion circuit 304 is used to convert the standard voltage signal into a digital signal through an analog-to-digital converter chip and transmit the digital signal to the main control unit 103 through the SPI bus.

[0062] Among them, the sensor signal conditioning circuit can be used to preprocess the original analog signal output by the gas sensor module to make it suitable for subsequent acquisition and processing, such as signal amplification, signal filtering, linearization processing, standard voltage signal output, etc. In specific implementation, since the analog signal output by the gas sensor module is usually weak, the signal conditioning circuit can amplify the signal; then perform signal filtering to remove noise and interference in the signal and retain useful signal components; perform linearization processing on the non-linear signal to make it linearly related to the gas concentration; the conditioned signal is converted into a standard voltage signal for subsequent processing. In other words, the sensor signal conditioning circuit can obtain a unified and easily processed and recognized standard voltage signal through resistance-voltage signal conversion, current-voltage signal conversion and amplification processing.

[0063] Among them, the standard voltage signal can be a voltage signal generated after being converted by the sensor signal conditioning circuit and within a unified voltage range (such as 0 - 5V or 0 - 3.3V).

[0064] Among them, the sensor signal conversion circuit can be used to convert the conditioned analog voltage signal into a digital signal so that the main control unit can process it. In specific implementation, the analog voltage signal can be converted into a digital signal through an analog-to-digital converter chip (such as ADS1118), and then the digital signal is transmitted to the main control unit through the SPI bus.

[0065] Among them, the SPI bus (Serial Peripheral Interface) is a high-speed, full-duplex synchronous serial communication protocol. The SPI bus is a synchronous communication protocol, which means that data transmission depends on the clock signal (SCK), and the sender and receiver exchange data under the synchronization of the clock signal. It has a fast transmission speed, supports simultaneous sending and receiving of data, high communication efficiency, and simple hardware implementation.

[0066] In the technical solution of this embodiment, by refining the signal processing circuit into a sensor signal conditioning circuit and a sensor signal conversion circuit, the signal acquisition and processing capabilities of the gas leakage monitoring system are optimized, significantly improving the measurement accuracy, reliability, and response speed of the system. The sensor signal conditioning circuit conditions and amplifies the analog signal output by the gas sensor module, and the sensor signal conversion circuit converts the conditioned analog signal into a digital signal and transmits it to the main control unit. This design not only solves the problem of low monitoring accuracy caused by solely relying on gas sensors in traditional technologies but also provides greater flexibility for system expansion and optimization.

[0067] In another embodiment, the environmental sensor module 102 includes a humidity sensor 402, a temperature sensor 404, and a pressure sensor 406; the main control unit 103 is configured to determine that the environmental data meets the environmental anomaly condition when at least one of the humidity data collected by the humidity sensor 402, the temperature data collected by the temperature sensor 404, and the pressure data collected by the pressure sensor 406 does not conform to the preset data range.

[0068] In practical applications, if a gas chamber leaks gas, the leaked gas may react with the moisture in the surrounding environment, causing local humidity changes. Moreover, the leaked sulfur hexafluoride gas decomposes under electric arcs or high temperatures, generating corrosive decomposition products (such as HF, SO2, etc.), and these decomposition products will further affect the humidity of the surrounding environment when they encounter water. If a gas chamber leaks gas, the leaked gas may mix with the air in the surrounding environment, causing local temperature changes, and the decomposition reaction of the leaked sulfur hexafluoride gas (such as arc decomposition) releases heat, which may cause the temperature of the surrounding environment of the gas chamber to rise. If a gas chamber leaks gas, the leaked gas will gradually diffuse into the surrounding environment, causing a change in the pressure of the surrounding environment of the gas chamber. The gas inside the gas chamber usually has a high density and pressure, and after leakage, it will cause the pressure of the surrounding environment to rise. Moreover, the leaked sulfur hexafluoride gas usually has a high density and pressure, and after leakage, it may cause the pressure of the surrounding environment to rise.

[0069] In specific implementation, by comprehensively considering the humidity, temperature, and pressure data, the system can more accurately determine whether there is gas leakage. If the pressure of the surrounding environment of the gas chamber rises while the humidity and temperature change, the system can determine that the possibility of gas leakage is relatively high.

[0070] Optionally, the preset data range can be a reasonable range of humidity, temperature, and pressure set according to the normal operating conditions of the surrounding environment of the gas chamber (such as humidity 30%-70%RH, temperature -20°C to 50°C, pressure 90 kPa to 110 kPa). If at least one piece of environmental data does not conform to the preset range, it can be determined that the environment is abnormal, indicating that there may be gas leakage.

[0071] In the technical solution of this embodiment, by expanding the functions of the environmental sensor module, including humidity sensors, temperature sensors, and pressure sensors, and comprehensively judging the environmental data by the main control unit, the environmental monitoring ability and reliability of the gas leakage monitoring system are significantly improved. By comparing the humidity, temperature, and pressure data with the preset ranges, the main control unit can detect environmental anomalies in a timely manner and trigger an alarm, providing strong guarantee for the safe operation of the gas-insulated switchgear chamber.

[0072] In another embodiment, the gas sensor module 101 includes a sulfur hexafluoride sensor 502; the sulfur hexafluoride sensor 502 is an infrared type sensor; the sulfur hexafluoride sensor 502 is used to collect the intensity change amount of the infrared light corresponding to the wavelength absorbed by sulfur hexafluoride, and generate the gas concentration of sulfur hexafluoride according to the intensity change amount.

[0073] In practical applications, sulfur hexafluoride gas has a strong absorption characteristic for infrared light of a specific wavelength. The infrared type sensor can use an infrared light source (infrared lamp or infrared laser) to emit infrared light of a specific wavelength. The infrared light passes through the gas to be measured, and the gas molecules absorb the infrared light energy of the specific wavelength. The infrared light after passing through the gas is received by the infrared detector, and the detector measures the light intensity after absorption. By comparing the light intensities before and after absorption, and using the Beer-Lambert Law to calculate the gas concentration, the gas concentration of sulfur hexafluoride can be obtained. Therefore, the infrared type sensor can directly output a digital signal (concentration value) without converting the analog signal through a signal processing circuit, and the main control unit can directly process the gas concentration of sulfur hexafluoride output by the sulfur hexafluoride sensor.

[0074] In practical applications, the sulfur hexafluoride in the switch room can be detected by the sulfur hexafluoride sensor. Generally, gas-insulated switchgear is installed in the switch room.

[0075] In the technical solution of this embodiment, by setting an infrared type sensor to detect sulfur hexafluoride, the gas concentration of sulfur hexafluoride can be directly obtained without first generating an analog signal and then converting it into a digital signal, thus simplifying the system design and improving the efficiency of gas leakage monitoring and the gas measurement accuracy.

[0076] In another embodiment, the gas sensor module 101 further includes an oxygen sensor 504 and a hydrogen sensor 506; the oxygen sensor 504 and the hydrogen sensor 506 are electrochemical sensors; the oxygen sensor 504 is configured to collect the electrical signals generated by the chemical reaction occurring between oxygen and the electrodes of the oxygen sensor as the analog signals output by the gas sensor module 101; the hydrogen sensor 506 is configured to collect the electrical signals generated by the chemical reaction occurring between hydrogen and the electrodes of the hydrogen sensor as the analog signals output by the gas sensor module 101.

[0077] Among them, the electrochemical sensor is based on specific chemical reactions that occur on the surface of the sensor electrodes and result in changes in electrical signals. This change can be measured and converted into signals that can be detected and analyzed, thereby realizing the detection of oxygen and hydrogen.

[0078] In practical applications, the electrochemical sensor has high sensitivity to gases such as oxygen and hydrogen and can detect low-concentration gases.

[0079] Among them, the oxygen sensor is based on the electrochemical principle. A chemical reaction occurs between oxygen and the sensor electrodes, generating electrical signals related to the oxygen concentration. The chemical reaction causes a change in the current or voltage between the electrodes, and the oxygen sensor converts this change into an electrical signal (such as a voltage or current signal) as the analog signal output by the gas sensor module.

[0080] The hydrogen sensor is also based on the electrochemical principle. A chemical reaction occurs between hydrogen and the sensor electrodes, generating electrical signals related to the hydrogen concentration. The chemical reaction causes a change in the current or voltage between the electrodes, and the hydrogen sensor converts this change into an electrical signal (such as a voltage or current signal) as the analog signal output by the gas sensor module.

[0081] In practical applications, the oxygen sensor can be used to dynamically detect the gas concentration of oxygen in the working environment of the gas-insulated switchgear, and the hydrogen sensor can be placed in the transformer oil of the gas-insulated switchgear to detect the hydrogen in the oil. In the gas-insulated switchgear, the transformer oil can be used for cooling and insulation, and the transformer oil may generate hydrogen due to partial discharge, overheating or arc faults inside the equipment.

[0082] The technical solution of this embodiment collects gas concentration data through the fusion of three sensors, namely, a sulfur hexafluoride sensor, an oxygen sensor, and a hydrogen sensor, improving the accuracy of gas leakage monitoring. Moreover, considering the characteristics of different gases, for example, sulfur hexafluoride has obvious absorption characteristics for infrared light and is the main gas for gas leakage monitoring, so it is suitable to use an infrared-type sensor. While oxygen and hydrogen have no obvious absorption characteristics for infrared light, and their concentrations are relatively low when gas leakage occurs, so they are suitable for electrochemical-type sensors, thus improving the flexibility and accuracy of gas leakage monitoring.

[0083] In another embodiment, the main control unit is configured to determine that the gas concentration data meets the gas anomaly condition when at least one of the following conditions is satisfied: the gas concentration of sulfur hexafluoride is higher than the first concentration threshold, the gas concentration of oxygen is lower than the second concentration threshold, and the gas concentration of hydrogen is higher than the third concentration threshold.

[0084] In practical applications, sulfur hexafluoride is a commonly used insulating gas, and its leakage can cause harm to the environment and human health. When the gas concentration of sulfur hexafluoride is higher than the first concentration threshold, it indicates that sulfur hexafluoride leakage may have occurred in the gas chamber. For example, the first concentration threshold can be 1000 ppm.

[0085] In practical applications, too low oxygen concentration may cause oxygen deficiency for the staff, posing a safety hazard. When the oxygen concentration is lower than the second concentration threshold, it indicates that the oxygen supply in the gas chamber is insufficient or the oxygen is diluted due to sulfur hexafluoride leakage. For example, the second concentration threshold can be 18.5%.

[0086] In practical applications, hydrogen is a product of transformer oil decomposition. Too high hydrogen concentration may indicate overheating or malfunction of the equipment. Moreover, the active substances (such as fluorine atoms) generated by the decomposition of sulfur hexafluoride will react with water to generate hydrogen fluoride, sulfur dioxide, etc. This process may also affect the ionization equilibrium of water and indirectly promote the generation of hydrogen. When the hydrogen concentration is higher than the third concentration threshold, it indicates that there may be abnormalities or gas leakage in the equipment. For example, the third concentration threshold can be 100 ppm.

[0087] The technical solution of this embodiment determines whether there is a gas anomaly by comprehensively judging the gas concentration data of sulfur hexafluoride, oxygen, and hydrogen. This design of multi-sensor data fusion significantly improves the detection accuracy and reliability of the gas leakage monitoring system.

[0088] In another embodiment, the gas leakage monitoring system further includes a gas sensor adapter circuit board and a sensor protective cover. A gas sensor socket is fixed on the gas sensor adapter circuit board, and the gas sensor module is inserted into the gas sensor socket. The gas sensor adapter circuit board is fixed in the sensor protective cover and is connected to the signal processing circuit through an adapter board cable.

[0089] Among them, the gas sensor adapter circuit board is used to fix and connect the gas sensor module, providing electrical connection and mechanical support.

[0090] Among them, the gas sensor socket is fixed on the gas sensor adapter circuit board and is used for plugging in the gas sensor module.

[0091] Among them, the adapter board ribbon cable is used to connect the gas sensor adapter circuit board and the signal processing circuit, transmitting the signal output by the gas sensor module. The gas sensor adapter circuit board is connected to the signal processing circuit through the adapter board ribbon cable, transmitting the signal output by the gas sensor module to the signal processing circuit.

[0092] Among them, the sensor protective cover is used to protect the housing of the gas sensor module and the gas sensor adapter circuit board, preventing physical damage and environmental interference. The gas sensor adapter circuit board is fixed in the sensor protective cover to ensure the stability of the sensor module and the circuit board.

[0093] The technical solution of this embodiment optimizes the installation, connection, and protection of the gas sensor module by adding the design of the gas sensor adapter circuit board and the sensor protective cover. The gas sensor module is installed on the adapter circuit board by plugging, and is connected to the signal processing circuit through the adapter board ribbon cable. The sensor protective cover effectively protects the gas sensor module and the adapter circuit board from physical damage or environmental interference. This design improves the reliability, environmental adaptability, and maintainability of the system, providing a strong guarantee for the stable operation of the gas leakage monitoring system.

[0094] In another embodiment, the main control unit is used to send gas concentration data, environmental data, and alarm information to the host computer through the USB serial port.

[0095] Among them, the USB serial port is a serial communication protocol based on the USB interface, used to implement data protocol conversion and data transmission between the main control unit and the host computer.

[0096] Among them, the USB serial port is used to transmit the gas concentration data, environmental data, and alarm information collected by the main control unit to the host computer. The USB serial port supports two-way communication. The main control unit can not only send data to the host computer, but also receive instructions sent by the host computer (such as parameter configuration, calibration instructions, etc.).

[0097] Optionally, a USB interface circuit can be designed on the PCB board of the main control unit to ensure that the USB serial port can be stably connected to the host computer; use a USB to serial chip (such as FT232, CH340, etc.) to convert the UART / TTL signal of the main control unit into a USB signal for easy communication with the host computer; install the driver program of the USB serial port on the host computer to ensure that the host computer can recognize and communicate.

[0098] In the technical solution of this embodiment, by adding the function of the USB serial port, data transmission between the main control unit and the host computer is realized. The main control unit can send gas concentration data, environmental data, and alarm information to the host computer in real time, which is convenient for users to monitor and analyze. Moreover, the USB serial port supports two-way communication. The main control unit can not only send data but also receive instructions from the host computer, which is convenient for system configuration and calibration. The USB serial port supports hot plugging, which is convenient for users to connect and disconnect devices, simplifies the system design and implementation, and improves the usability and maintainability of the gas leakage monitoring system.

[0099] In another embodiment, the main control unit can also achieve two-way communication with the host computer through the UART serial port. The UART serial port is a Universal Asynchronous Receiver / Transmitter, which can perform asynchronous serial communication without the need for clock signal synchronization.

[0100] In another embodiment, the main control unit 103 is used to send gas concentration data and environmental data to the cloud platform through the WIFI wireless communication module 106.

[0101] Among them, the WIFI wireless communication module is a module for realizing wireless data transmission, such as WIFI, 4G, LoRa, etc. Exemplarily, the WIFI wireless communication module is a WIFI communication module. Through the WIFI communication module, real-time monitoring of the changes in various parameters in the working environment can be realized on the cloud platform. The WIFI communication module can be powered by 3.3 volts, and two pull-up resistors are externally connected to realize data transmission between the main control unit and the Internet of Things cloud platform.

[0102] Among them, the cloud platform is a remote data storage and processing platform based on the Internet, which is used to receive, store, and analyze the data sent by the main control unit.

[0103] Optionally, the WIFI wireless communication module can be connected to the main control unit through UART, SPI, or I²C interfaces to ensure the stability of data transmission. The main control unit can send data to the cloud platform through the WIFI wireless communication module based on communication protocols such as MQTT, HTTP, or TCP / IP.

[0104] In specific implementation, the cloud platform receives the gas concentration data and environmental data sent by the main control unit through the WIFI wireless communication module, stores the received data in the cloud for subsequent analysis and query; it can also display the gas concentration data and environmental data in real time through a Web interface or a mobile application, which is convenient for users to monitor, and reminds users by means of text messages, emails, or APP push.

[0105] The technical solution of this embodiment realizes the data transmission between the main control unit and the cloud platform by adding the functions of the WIFI wireless communication module. The main control unit sends gas concentration data and environmental data to the cloud platform through the WIFI wireless communication module, which is convenient for users to remotely monitor and analyze. The WIFI wireless communication module supports real-time data transmission and alarm information sending, improving the remote monitoring ability and response speed of the gas leakage monitoring system.

[0106] In some other embodiments, the gas leakage monitoring system further includes a switch control circuit, which is used to control the startup and shutdown of the gas leakage monitoring system. The switch control circuit controls the switch of the gas leakage monitoring system through a touch button, realizing the one-key power on / off function. In specific implementation, further design the switch control circuit to change the states of 2 MOS transistors and an enhanced PMOS through 1 touch button, so as to realize that one button can control the two states of the circuit switch.

[0107] In specific implementation, the gas leakage monitoring system can start the operation of the gas leakage monitoring system through the switch control circuit. The switch control circuit extends the switch function of the circuit to the external thin-film switch panel through an FPC flexible cable. When the switch is pressed for the first time, the triode Q1 conducts, Q2 cuts off, and the PMOS switch (P-type metal oxide semiconductor field effect transistor) conducts. At this time, the circuit is connected, and the gas leakage monitoring system starts to work. Press the switch again, the triode Q1 cuts off, Q2 conducts, and the PMOS switch disconnects, thus realizing the one-key switch control of the gas leakage monitoring system. In the normal working state of the gas leakage monitoring system, first, the main control unit communicates with the analog-to-digital conversion chip through the IIC bus (I²C, Inter-Integrated Circuit) to set appropriate working voltages for the sensors in the gas sensor module and the environmental sensor module. After setting the working voltages, the analog signals of the sensors can be converted into electrical signals (such as voltage signals) that can be detected and recognized by the main control unit through the sensor signal conditioning circuit, and then the electrical signals are converted into digital signals through the sensor signal conversion circuit and transmitted to the main control unit. After the main control unit obtains the digital signals, it determines the gas concentration data and environmental data, which can be uploaded to the host computer, display screen, SD card storage module, or the data can be transmitted to the cloud platform through the WIFI wireless communication module for storage or real-time display.

[0108] For the convenience of understanding by those skilled in the art, Figure 4 An exemplary structural schematic diagram of a switch control circuit is provided.

[0109] Among them, VBAT is the power input pin, which is usually connected to a battery or an external power supply to provide the working voltage for the circuit and can provide power for the entire switch control circuit.

[0110] Among them, R46 (10K resistor), R47 (10K resistor), R51 (4.7K resistor), R52 (1K resistor), and R53 (10K resistor) are current-limiting resistors used to limit current and protect other components in the circuit. They play the roles of voltage division and current limiting in the circuit to ensure the stable operation of the circuit.

[0111] Among them, Q7 (SS8050 triode) is an NPN-type triode used for amplifying current or as a switch control. In the switch control circuit, Q7 is used to control the state of the MOS tube to achieve the switch function of the circuit.

[0112] Among them, dc1 and dc2 are tactile switch connection points. Pressing the button can achieve a short connection of the circuit to change the switch state of the circuit. For example, pressing once turns it on, and pressing again turns it off.

[0113] Among them, C31 (0.1uF capacitor) is a filtering capacitor used to filter out high-frequency noise in the circuit and stabilize the voltage. It plays the roles of filtering and voltage regulation in the circuit to prevent mis-triggering caused by voltage fluctuations in the circuit.

[0114] Among them, NCE3401AY (MOS tube) is an N-channel MOS tube used to control the on and off of the circuit. In the switch control circuit, NCE3401AY is used to achieve the switch function of the circuit.

[0115] Among them, Q8 (SS8050 triode) is an NPN-type triode used for amplifying current or as a switch control. In the switch control circuit, Q8 is used to control the state of the MOS tube to achieve the switch function of the circuit.

[0116] Among them, L3 (blue LED) is a light-emitting diode used to indicate the state of the circuit. When the circuit is turned on, the LED lights up; when the circuit is turned off, the LED goes out, which is convenient for users to observe the circuit state.

[0117] The state of the MOS tube and the triode is controlled by a tactile button to achieve the switch function of the circuit. In this switch control circuit, the state of the MOS tube and the triode is controlled by a tactile button to achieve the on and off of the circuit. The components in the circuit include resistors, capacitors, triodes, MOS tubes, and LED indicators. Each component works together to ensure the stable operation of the circuit and the circuit state is indicated by the LED.

[0118] For the convenience of understanding by those skilled in the art, Figure 5 an exemplary working logic diagram of a gas leakage monitoring system is provided.

[0119] In specific implementation, analog signals related to gases are collected by gas sensors such as SF6 sensors, H2 sensors, and O2 sensors (gas parameter sensors). After signal acquisition, signal conditioning, and signal conversion of these analog signals, they are then input into the single-chip microcomputer system.

[0120] Among them, the single-chip microcomputer system can refer to the main control unit, which is responsible for processing data from each sensor and judging whether abnormal situations such as gas leakage or too low oxygen concentration occur according to preset thresholds; processing the collected data, calculating parameters such as gas concentration, temperature, and humidity, and performing alarm or data storage as needed.

[0121] In specific implementation, the single-chip microcomputer system can transmit the monitored data to the cloud platform through wireless communication to achieve remote monitoring and data sharing. When an anomaly is detected, the system can send an alarm message to the cloud platform through the WIFI wireless communication module.

[0122] The gas leakage monitoring system can be configured with a liquid crystal display to display in real time parameters such as the monitored gas concentration, temperature, and humidity. When an anomaly is detected, the display will give an alarm prompt (such as red flashing).

[0123] The gas leakage monitoring system can store both abnormal data and data that fails to be uploaded successfully through WIFI into the SD card for subsequent data analysis and troubleshooting.

[0124] The gas leakage monitoring system supports two-way communication with the upper computer through the USB serial port for easy data export and system debugging.

[0125] The power supply and management module can be responsible for providing a stable working voltage for each functional unit and managing the charging and discharging process of the battery. Optionally, the power supply and management module can use a 12V polymer lithium battery to provide the normal working voltage required for the operation of each functional unit.

[0126] The sensor drive circuit can provide the working voltage and current for the gas sensors to ensure the normal operation of the sensors.

[0127] In the related art, the gas chamber monitoring scenario of gas-insulated switchgear is complex, and there are a wide variety of gases and parameters to be detected, so it may be necessary to frequently replace different types of portable detection instruments. When the environment becomes complex, the cost of existing sensor array-based solutions increases significantly, and their environmental adaptability is poor. Currently, there is a lack of a low-cost and convenient monitoring system that can achieve gas detection in both simple and complex environments. Therefore, the gas leakage detection system of this application can achieve the detection of different types of gases in different environments. This gas leakage detection system can meet the detection requirements of gases such as sulfur hexafluoride, hydrogen, and oxygen, as well as temperature, humidity, and pressure, and is suitable for application in typical scenarios such as toxic and harmful gas detection and environmental monitoring in industrial / military sites. The leakage gas detection accuracy is improved through multi-sensor fusion technology.

[0128] It can be seen that when the gas concentration data and environmental data in the working environment are abnormal, the gas leakage monitoring system can give an alarm in real time, and at the same time store the abnormal data in the SD card and transmit the data to the cloud platform through the WIFI wireless communication module to achieve remote monitoring. The gas leakage monitoring system adopts the sensor detection principle and has the advantages of small volume, good portability, high reliability, low false alarm rate, little influence by environmental factors, small error, etc., and has a long service life, the probe can be replaced at any time, and it is convenient to debug.

[0129] It should be understood that although the steps in the flowcharts involved in the above-mentioned embodiments are shown in sequence according to the indication of the arrows, these steps do not necessarily have to be executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps does not have a strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments may include multiple steps or multiple stages. These steps or stages do not necessarily have to be executed at the same time, but can be executed at different times. The execution order of these steps or stages does not necessarily have to be sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0130] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0131] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0132] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope recorded in the present application.

[0133] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A gas leakage monitoring system for a gas chamber of a gas-insulated switchgear, characterized in that, The gas leakage monitoring system includes: a gas sensor module, an environmental sensor module, a main control unit, a display screen, a WIFI wireless communication module, and a host computer; the output ends of the gas sensor module and the environmental sensor module are respectively connected to the input end of the main control unit; the display screen is connected to the main control unit; the output end of the main control unit is connected to the host computer; the main control unit communicates with the host computer through the WIFI wireless communication module; The main control unit is configured to obtain the gas concentration data around the gas chamber of the gas-insulated switchgear and the environmental data inside the gas chamber of the gas-insulated switchgear; the gas concentration data is determined according to the gas sensor data collected by the gas sensor module, and the environmental data is determined according to the environmental sensor data collected by the environmental sensor module; The main control unit is further configured to determine that the gas chamber of the gas-insulated switchgear is in a gas leakage state and send an alarm message to the host computer when the gas concentration data meets the gas anomaly condition and the environmental data meets the environmental anomaly condition; The display screen is configured to display the gas concentration data, the environmental data, and the alarm message sent by the main control unit.

2. The system according to claim 1, wherein The gas leakage monitoring system further includes a signal processing circuit, and the signal processing circuit is respectively connected to the gas sensor module and the main control unit; The signal processing circuit is configured to convert the analog signal output by the gas sensor module into a digital signal; The main control unit is configured to determine the gas concentration data around the gas chamber of the gas-insulated switchgear according to the digital signal.

3. The system according to claim 2, wherein The signal processing circuit includes a sensor signal conditioning circuit and a sensor signal conversion circuit; the input end of the sensor signal conditioning circuit is connected to the output end of the gas sensor module, and the output end of the sensor signal conversion circuit is connected to the main control unit; The sensor signal conditioning circuit is configured to perform signal conditioning processing and signal amplification processing on the analog signal output by the gas sensor module to obtain a standard voltage signal corresponding to the analog signal; The sensor signal conversion circuit is configured to convert the standard voltage signal into a digital signal through an analog-to-digital converter chip and transmit the digital signal to the main control unit through the SPI bus.

4. The system according to claim 1, characterized in that The environmental sensor module includes a humidity sensor, a temperature sensor, and a pressure sensor; The main control unit is configured to determine that the environmental data meets the environmental anomaly condition when at least one of the humidity data collected by the humidity sensor, the temperature data collected by the temperature sensor, and the pressure data collected by the pressure sensor does not meet the preset data range.

5. The system according to claim 2, characterized in that, The gas sensor module includes a sulfur hexafluoride sensor; the sulfur hexafluoride sensor is an infrared type sensor; The sulfur hexafluoride sensor is configured to collect the intensity change amount of the infrared light corresponding to the wavelength absorbed by sulfur hexafluoride and generate the gas concentration of sulfur hexafluoride according to the intensity change amount.

6. The system according to claim 5, wherein The gas sensor module further includes an oxygen sensor and a hydrogen sensor; the oxygen sensor and the hydrogen sensor are electrochemical sensors; The oxygen sensor is configured to collect the electrical signal generated by the chemical reaction occurring between oxygen and the electrodes of the oxygen sensor as the analog signal output by the gas sensor module; The hydrogen sensor is configured to collect the electrical signal generated by the chemical reaction occurring between hydrogen and the electrodes of the hydrogen sensor as the analog signal output by the gas sensor module.

7. The system according to claim 6, wherein The main control unit is configured to determine that the gas concentration data meets the gas anomaly condition when at least one of the conditions that the gas concentration of sulfur hexafluoride is higher than the first concentration threshold, the gas concentration of oxygen is lower than the second concentration threshold, and the gas concentration of hydrogen is higher than the third concentration threshold is satisfied.

8. The system according to claim 2, characterized in that The gas leakage monitoring system further includes a gas sensor adapter circuit board and a sensor protective cover; a gas sensor socket is fixed on the gas sensor adapter circuit board, and the gas sensor module is inserted into the gas sensor socket; the gas sensor adapter circuit board is fixed in the sensor protective cover and is connected to the signal processing circuit through an adapter board wiring harness.

9. The system according to claim 1, wherein The main control unit is configured to send the gas concentration data, the environmental data, and the alarm information to the host computer through a USB serial port.

10. The system according to claim 1, wherein The main control unit is configured to send the gas concentration data and the environmental data to the cloud platform through the WIFI wireless communication module.

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