Leakage detection system based on sulfur hexafluoride gas

Abstract

The invention discloses a leakage detection system based on sulfur hexafluoride gas, and relates to the technical field of industrial gas monitoring, and the system comprises a multi-channel gas detection module, a system host, a ventilation control module, a man-machine interaction module and a data communication module. The SF6 gas and oxygen content in the environment can be accurately detected, potential safety hazards can be found in time, when the SF6 gas content exceeds the standard or the oxygen content is too low, the system host rapidly sends out an alarm signal, the ventilator is automatically started for ventilation, workers are effectively prevented from being hurt due to the fact that the workers inhale harmful gas or lack oxygen, and meanwhile the safety of the workers is guaranteed. The real-time monitoring of the temperature and humidity is also beneficial to maintaining the stable operation environment of the equipment, and the equipment performance is prevented from being influenced by the abnormal temperature and humidity.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial gas monitoring, and specifically provides a leakage detection system based on sulfur hexafluoride gas. Background Art

[0002] In modern power systems, sulfur hexafluoride (SF 6 ) gas is widely used in various high-voltage electrical equipment due to its excellent insulation and arc extinguishing properties, such as SF 6 switch rooms, SF 6 gas-insulated switchgear rooms (GIS rooms), SF 6 transformer rooms, etc. With the rapid development of the power industry, the scale and complexity of power equipment are increasing continuously, and the safety monitoring of the SF 6 gas usage environment becomes more and more important. These places where the equipment is located often have a large number of electrical equipment and lines, and the operating environment is complex. Once SF 6 gas leaks, it will not only endanger the physical health of on-site workers, but also may cause electrical failures and even lead to serious safety accidents.

[0003] However, the existing SF 6 gas leakage detection technologies have many deficiencies: on the one hand, the detection accuracy is limited, and it is difficult to detect trace SF 6 gas leakage. The detection lower limit of traditional detection equipment is relatively high, and early leakage signs cannot be detected in time, resulting in potential safety hazards existing for a long time; on the other hand, the functions are not comprehensive enough. Some detection systems can only achieve a single gas concentration detection function, lacking functions such as oxygen content detection, temperature and humidity detection, automatic ventilation control, and remote monitoring, and cannot meet the comprehensive requirements of the power system for safe production. Moreover, the existing alarm system is separated from the ventilation system, and the dynamic matching of the leakage concentration and the ventilation power cannot be achieved, resulting in high energy consumption and low efficiency.

[0004] In summary, there is an obvious gap between the technical requirements for SF 6 gas leakage detection in the current power system and the existing technologies. It is urgent to develop a high-precision, multi-functional, and intelligent leakage detection system based on sulfur hexafluoride gas, which not only helps to ensure the life safety of power workers and the stable operation of power equipment, but also can improve the safety production management level of power enterprises. Summary of the Invention

[0005] The purpose of the present invention is to make up for the deficiencies of the existing technologies, and provides a leakage detection system based on sulfur hexafluoride gas. It can accurately detect the SF 6 gas and oxygen content in the environment through a high-precision multi-channel gas detection module, and timely discover potential safety hazards. When SF 6When the gas content exceeds the standard or the oxygen content is too low, the system host quickly issues an alarm signal and automatically starts the ventilator for ventilation, effectively preventing staff from being harmed by inhaling harmful gases or suffering from oxygen deficiency. At the same time, real-time monitoring of temperature and humidity also helps maintain a stable operating environment for the equipment and prevent abnormal temperature and humidity from affecting the equipment performance.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A leakage detection system based on sulfur hexafluoride gas, which consists of: a multi-channel gas detection module, a system host, a ventilation control module, a human-machine interaction module, and a data communication module;

[0007] The multi-channel gas detection module is composed of a gas transmitter and a temperature and humidity transmitter, which collects gas and environmental data in real time and directly transmits the data to the system host for analysis and processing;

[0008] The system host is used to receive the data transmitted by the detection module, analyze and judge the data, and has a built-in processor and memory to dynamically control the fan power according to the concentration data;

[0009] The ventilation control module is built-in with a fan controller and is linked with the system host. After receiving the control instruction, it automatically adjusts the fan power and supports over-temperature linkage control. When the ambient temperature exceeds the temperature detection range of -20°C - 99°C, forced ventilation is started;

[0010] The human-machine interaction module is equipped with a liquid crystal display screen and a dynamic alarm screen. Among them, the liquid crystal display screen is used to display the real-time data of SF 6 gas content, oxygen content, temperature and humidity in the environment. The dynamic alarm screen is used to display the on-site monitoring status, and can automatically give a voice prompt when detecting human induction. At the same time, it has a normally open alarm contact output function for connecting external audible and visual alarm devices;

[0011] The data communication module supports multi-mode communication of Ethernet, RS232 and RS485, uploads the monitoring data to the upper computer, and realizes the functions of remote monitoring and leakage point positioning on the GIS map.

[0012] Further, the gas transmitter in the multi-channel gas detection module contains an SF 6 gas sensor and an oxygen sensor, and the temperature and humidity transmitter contains a temperature sensor and a humidity sensor, where:

[0013] The SF 6 gas sensor is used to detect the SF 6 gas content in the environment;

[0014] The oxygen sensor is used to obtain oxygen content data;

[0015] The temperature sensor is used to detect the temperature data in the environment;

[0016] The humidity sensor is used to detect the humidity data in the environment.

[0017] Furthermore, in the multi-channel gas detection module, the detection range of the SF 6 gas sensor is 0 - 2000 ppm, the lowest leakage alarm point is 10 ppm, and the alarm threshold is 50 - 1500 ppm;

[0018] The detection range of the oxygen sensor is 1.0% - 25.0%, the detection accuracy is less than 0.5%, and the hypoxia alarm threshold is default set to 18%.

[0019] Furthermore, when the processor of the system host detects that the SF 6 gas content in the environment exceeds the alarm threshold and the oxygen content is lower than the hypoxia alarm threshold, the host immediately issues an alarm signal and sends a control instruction to the fan controller to automatically turn on the ventilator for ventilation, supporting timed exhaust and forced exhaust functions, and dynamically adjusting the ventilation strategy according to the SF 6 concentration change rate ΔC / Δt.

[0020] Furthermore, the system host receives the SF 6 gas concentration data C transmitted by the multi-channel gas detection module, records the time t corresponding to each data, and calculates the concentration gradient ΔC / Δt according to the time interval Δt, where ΔC = C t -C t-1 , C t is the gas concentration at the current moment, and C t-1 is the gas concentration at the previous moment. Then the gas concentration change rate Combined with the SF 6 gas sensor alarm threshold of 50 - 1500 ppm, formulate a dynamic ventilation strategy adjustment and send a control signal to the ventilation control module.

[0021] Furthermore, the logical judgment rule for the dynamic ventilation strategy adjustment is:

[0022] First-level response: When C t > 50 ppm and ΔC / Δt > 10 ppm / s, it is determined as a sudden leakage, and the fan is started at 50% power;

[0023] Second-level response: When C t > 1000 ppm and ΔC / Δt > 50 ppm / s are satisfied for one of them, it is determined as a serious leakage, and the fan is started at 100% power;

[0024] Steady-state control: When C tWhen <50 ppm and ΔC / Δt < 1 ppm / s, the fan maintains 10% of the basic ventilation power.

[0025] Furthermore, after receiving the control instruction, the fan controller of the ventilation control module adjusts the input voltage V of the fan motor by real-time monitoring of the fan load current I, thereby changing the output power P = I × V, and feeds it back to the system host to dynamically adjust the ventilation strategy for closed-loop control.

[0026] Furthermore, the memory in the system host is used to cache monitoring data in real time and backup historical records. Its capacity is 1 million and 10 million, and it is partitioned and stored according to data types, including:

[0027] SF 6 Original concentration data: sampling frequency, timestamp marker;

[0028] Alarm event log: records trigger time, concentration value, fan response action;

[0029] System self-check report: generates a device status verification file daily.

[0030] Compared with the prior art, the sulfur hexafluoride gas-based leakage detection system has the following

[0031] Beneficial effects:

[0032] First, through the high-precision multi-channel gas detection module of the present invention, it can accurately detect the content of SF 6 gas and oxygen in the environment, and timely discover potential safety hazards. When the content of SF6 gas exceeds the standard or the oxygen content is too low, the system host quickly issues an alarm signal and automatically starts the ventilator for ventilation, effectively preventing staff from being harmed by inhaling harmful gases or lack of oxygen. At the same time, the real-time monitoring of temperature and humidity also helps to maintain a stable operating environment for the equipment and prevent the equipment performance from being affected by abnormal temperature and humidity.

[0033] Second, the data communication module of the present invention supports multiple communication methods and can upload monitoring data to the upper computer in real time to achieve remote monitoring function. This enables managers to grasp the situation of each monitoring area at any time without having to be on-site, facilitating timely decision-making. At the same time, the memory of the system host can store a large amount of historical data and supports classified storage and quick query. By analyzing the historical data, the laws and trends of gas leakage can be summarized, providing a strong basis for preventive maintenance.

[0034] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. Brief Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is an operation flowchart of a leakage detection system based on sulfur hexafluoride gas;

[0037] Figure 2 It is a system schematic diagram of a leakage detection system based on sulfur hexafluoride gas. Detailed Embodiment

[0038] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, in combination with the drawings and preferred embodiments, detail the specific implementation manners, structures, features and their effects of the present invention as follows.

[0039] Embodiment 1

[0040] This embodiment elaborates in detail the specific operation process of a leakage detection system based on sulfur hexafluoride gas. The system integrates multiple modules such as multi-channel gas detection, intelligent analysis of the system host, ventilation control, human-computer interaction and data communication, aiming to accurately monitor the leakage of sulfur hexafluoride gas, ensure the safety of personnel and the stable operation of equipment. Through the collaborative work of each module, it realizes the real-time monitoring of gas concentration, temperature and humidity in the environment, conducts intelligent analysis and dynamic ventilation control based on the monitoring data, and supports remote monitoring and historical data management. This embodiment will detail the working principle, operation process and the cooperation relationship between each module to clearly present the working mechanism of the entire system.

[0041] The multi-channel gas detection module is responsible for real-time collection of gas and environmental data in the environment. It consists of a gas transmitter and a temperature and humidity transmitter. The gas transmitter contains an SF 6 gas sensor and an oxygen sensor, and the temperature and humidity transmitter contains a temperature sensor and a humidity sensor. Among them, the SF 6 gas sensor is used to detect the SF 6 gas content in the environment. When the SF 6 gas molecules in the environment interact with the sensing element of the sensor, corresponding electrical signal or optical signal changes will occur. The sensor converts these signals into digital quantities, representing the SF 6Gas concentration, with a detection range of 0 - 2000 ppm, can detect extremely trace gas leaks, the lowest leakage alarm point is 10 ppm, and the alarm threshold is 50 - 1500 ppm; the oxygen sensor has a detection range of 1.0% - 25.0%, and the detection accuracy is less than 0.5%. By detecting the concentration of oxygen molecules in the environment, accurate oxygen content data can be obtained. In a normal environment, the oxygen content is relatively stable, but when SF 6 There is a large amount of gas leakage, it will displace the oxygen in the air, resulting in a decrease in the oxygen content. Therefore, accurately detecting the oxygen content is crucial. The hypoxia alarm threshold is default set to 18%; the temperature sensor and humidity sensor are respectively used to detect the temperature and humidity data in the environment. These two sensors can monitor the environmental temperature and humidity in real time, providing a basis for judging whether the equipment operating environment is suitable. The gas transmitter and temperature and humidity transmitter collect data at the same sampling frequency. Each time the SF 6 Gas concentration, oxygen content, temperature, and humidity data are marked with accurate timestamps, and then through the data transmission line, these data are directly transmitted to the system host for subsequent analysis and processing.

[0042] The system host undertakes the key tasks of data reception, analysis and judgment, and instruction issuance. It has a built-in processor and memory, and can efficiently process a large amount of data transmitted from the multi-channel gas detection module. When the system host receives the SF 6 Gas concentration data C, oxygen content data, temperature data, and humidity data, it first preprocesses the data, checks the integrity and accuracy of the data, and eliminates existing error data or outliers. The processor starts the analysis and judgment work based on the received concentration data: the processor will monitor in real time whether the SF 6 Gas concentration exceeds the alarm threshold, and whether the oxygen content is lower than the hypoxia alarm threshold. When it is detected that the SF 6 Gas content in the environment exceeds the alarm threshold or the oxygen content is lower than the hypoxia alarm threshold of 18%, the system host immediately issues an alarm signal. At the same time, it also supports timed exhaust and forced exhaust functions, and dynamically adjusts the ventilation strategy according to the SF 6 Concentration change rate ΔC / Δt. To calculate the concentration change rate ΔC / Δt, the system host receives the SF 6 Gas concentration data C, and records the time t corresponding to each data, and calculates the concentration gradient at a set time interval Δt, where ΔC = C t -C t-1 , C t is the gas concentration at the current moment, C t-1 is the gas concentration at the previous moment. According to the concentration change rate is obtained. The system host combines the SF 6The alarm threshold of the gas sensor is 50 - 1500 ppm. A dynamic ventilation strategy is formulated and a control signal is sent to the ventilation control module. The specific logic judgment rules are as follows:

[0043] First - level response: When C t > 50 ppm and ΔC / Δt > 10 ppm / s, it is determined as a sudden leak, which means that the concentration of SF 6 gas rises rapidly in a short time, indicating a leak. At this time, the system host sends an instruction to the ventilation control module to start the fan to run at 50% power, and quickly discharge the leaked SF 6 gas, reduce the indoor gas concentration, and ensure the safety of personnel;

[0044] Second - level response: When C t > 1000 ppm and ΔC / Δt > 50 ppm / s are satisfied for one of them, it is determined as a serious leak. In this case, the indoor SF 6 gas concentration has reached a relatively high level, or the leakage speed is extremely fast. The system host sends an instruction to the ventilation control module to start the fan to run at maximum power, and fully ventilate to reduce the gas concentration at the fastest speed to prevent serious safety accidents;

[0045] Steady - state control: When C t < 50 ppm and ΔC / Δt < 1 ppm / s, it indicates that the concentration of SF 6 gas in the environment is at a relatively low level, and the concentration change is relatively stable, without obvious signs of leakage. At this time, the fan maintains a basic ventilation power of 10%, which can not only keep the indoor air circulating but also reduce energy consumption.

[0046] The memory in the system host is used to cache monitoring data in real - time and backup historical records. Its capacity is 1 million and 10 million, and it is partitioned and stored according to data types. Among them, the original SF 6 concentration data is marked with sampling frequency and timestamp, which is convenient for subsequent query and analysis of the SF 6 gas concentration change at different time points; the alarm event log records the trigger time, concentration value, and fan response actions, which helps to trace the occurrence process of alarm events and the response of the system; the system self - test report generates a device status verification file every day, which is used to record the operating status of each component of the system and timely detect potential fault hazards.

[0047] The ventilation control module is the executive part for ensuring indoor air quality. It has a built-in fan controller that is closely linked to the system host. When the fan controller of the ventilation control module receives the control instruction sent by the system host, it starts to perform the corresponding ventilation operation. The fan controller adjusts the input voltage V of the fan motor by monitoring the fan load current I in real time and according to the power calculation formula P = I×V, thereby changing the output power P of the fan. For example, when the system host determines a first-level response and requires the fan to operate at a certain proportion of power, the fan controller adjusts the voltage according to the current fan load current to make the fan reach the corresponding power output, ensuring effective discharge of the leaked SF 6 gas. During the adjustment process, the fan controller will feedback the operating status of the fan (such as parameters like power and current) to the system host in real time. Based on this feedback information, the system host further dynamically adjusts the ventilation strategy to achieve closed-loop control. The ventilation control module also supports over-temperature interlock control. When the ambient temperature exceeds the temperature detection range of -20°C - 99°C, it indicates that the ambient temperature has an adverse impact on equipment operation or personnel safety. At this time, the ventilation control module activates the forced exhaust function, operates the fan at maximum power, quickly reduces the indoor temperature, and maintains a normal operating environment for the equipment. During the entire operation process, the ventilation control module precisely controls the operating status of the fan according to the instructions of the system host to ensure that the indoor SF 6 gas concentration and temperature are always within the safe range, providing a safe working environment for the staff and ensuring the stable operation of power equipment.

[0048] The human-machine interaction module is used for information interaction between the user and the leakage detection system. It is equipped with a liquid crystal display screen and a dynamic alarm screen, providing users with an intuitive and convenient way to operate and obtain information. Among them, the liquid crystal display screen is used to display the real-time data of SF 6 gas content, oxygen content, temperature and humidity in the environment. The staff can understand the various parameters of the current environment at any time through the liquid crystal display screen and judge whether there are potential safety hazards. For example, when the SF 6 gas concentration is close to the alarm threshold, the staff can take corresponding measures in advance, such as strengthening inspections and finding the leakage source, etc.; the dynamic alarm screen is used to display the on-site monitoring status and can automatically give voice prompts when detecting human presence. When the system detects abnormal situations, such as SF 6When there is a gas leak or the oxygen content is too low, the dynamic alarm screen will display alarm information in a prominent way, such as flashing lights, prominent text prompts, etc. At the same time, when someone approaches the dynamic alarm screen, it will automatically give a voice prompt to inform the on-site personnel of the current abnormal situation and remind them to pay attention to safety. The human-machine interaction module also has a normally open alarm contact output function for connecting external audible and visual alarm devices. When the system issues an alarm signal, the normally open alarm contact closes, and the external audible and visual alarm devices (such as warning lights) are triggered to emit strong audible and visual warnings, further expanding the alarm range to ensure that all personnel in the station can be informed of the abnormal situation in a timely manner and take corresponding countermeasures.

[0049] The data communication module is an important part of realizing the remote monitoring and data sharing of the system. It supports multi-mode communication of Ethernet, RS232, and RS485. Through the Ethernet communication method, the system uploads the monitoring data to the upper computer in real time. The upper computer is located in the monitoring center of the substation or the remote management center. In the monitoring center, the management personnel can view the SF 6 gas content, oxygen content, temperature, humidity and other data in real time to realize the remote centralized monitoring of multiple areas in the substation. The RS232 and RS485 communication methods provide more communication flexibility for the system, which are used for local recording and printing of data. At the same time, these communication methods can also be used as backup methods for Ethernet communication. When the Ethernet fails, it ensures that the data can continue to be transmitted to ensure the stability and reliability of the system. The data communication module also has the function of locating the leakage point on the GIS map. When the system detects the SF 6 gas leak, through the analysis and calculation of the data of multiple monitoring points and combined with the GIS map, the location of the leakage point can be accurately located, which enables the staff to quickly find the leakage source and carry out repairs and treatments in a timely manner, reducing the impact of the leakage on the environment and personnel. During daily operation, the data communication module continuously uploads the monitoring data to the upper computer, and the upper computer stores and analyzes these data. The management personnel can query and analyze the historical data through the upper computer to summarize the laws and trends of gas leakage and prevent the occurrence of leakage accidents in advance.

[0050] In summary, in this embodiment, the sulfur hexafluoride gas-based leakage detection system realizes the monitoring of SF in the power substation through the close cooperation of the multi-channel gas detection module, the system host, the ventilation control module, the human-machine interaction module, and the data communication module. 6Omnidirectional monitoring, intelligent alarm, and effective handling of gas leakage. With high-precision sensors, the multi-channel gas detection module collects gas and environmental data in real time and accurately, and transmits it to the system host. As the core processing unit, the system host deeply analyzes the data, dynamically adjusts the ventilation strategy based on the concentration data and change rate, and stores historical data for subsequent analysis. The ventilation control module accurately controls the operating state of the fan according to the instructions of the system host to ensure that the indoor air quality and temperature are always within the safe range. The human-computer interaction module provides an intuitive operation interface and timely alarm prompts for users, facilitating users to understand the system operation status and take countermeasures. The data communication module realizes remote monitoring and data sharing, improving the management efficiency and response speed of the system. The operation process of the entire system can effectively guarantee the life safety of power workers, ensure the stable operation of power equipment, and improve the safety production management level of power enterprises.

[0051] Embodiment 2

[0052] As Figure 1 shown, this embodiment provides a specific process for detecting the leakage of sulfur hexafluoride gas by a sulfur hexafluoride gas-based leakage detection system as follows:

[0053] (1) Data acquisition

[0054] Gas concentration acquisition: The gas sensors in the multi-channel gas detection module continuously detect the content of sulfur hexafluoride gas in the environment, and the oxygen sensor simultaneously detects the oxygen content in the environment;

[0055] Temperature and humidity acquisition: The temperature sensor and humidity sensor in the temperature and humidity transmitter respectively detect the temperature and humidity of the environment;

[0056] Timestamp marking: All collected data is marked with an accurate timestamp;

[0057] (2) Data transmission

[0058] The multi-channel gas detection module transmits the collected SF 6 gas concentration, oxygen content, temperature, and humidity data to the system host;

[0059] (3) Data processing and analysis

[0060] Data preprocessing: After receiving the data, the system host preprocesses the data to check the integrity and accuracy of the data;

[0061] Concentration analysis: The system host real-time monitors whether the SF 6 gas concentration exceeds the pre-set alarm threshold range;

[0062] Oxygen content analysis: The system host checks whether the oxygen content is lower than the hypoxia alarm threshold range:

[0063] Temperature analysis: The system host determines whether the ambient temperature exceeds the normal range;

[0064] (4) Logical judgment and decision-making

[0065] No abnormal situation: If the concentration of SF 6 gas does not exceed the alarm threshold, the oxygen content is not lower than the hypoxia alarm threshold, and the temperature is within the normal range. At the same time, if the concentration change rate ΔC / Δt is less than the set change rate threshold, the system determines that the environment is normal, and the ventilation control module maintains the fan to operate at a basic ventilation power of 10%, keeping the indoor air circulating basically;

[0066] First-level response in case of abnormal situation: When C t > 50 ppm and ΔC / Δt > 10 ppm / s, it is determined as a sudden leak. The system host determines that there is a leak situation and starts the fan at 50% power;

[0067] Second-level response: When C t > 1000 ppm and ΔC / Δt > 50 ppm / s meet one of them, it is determined as a serious leak and the fan is started at 100% power;

[0068] Hypoxia response: When the oxygen content is lower than the hypoxia alarm threshold of 18%, it is determined as a hypoxia dangerous situation;

[0069] Over-temperature response: When the ambient temperature exceeds the normal range, it is determined as an over-temperature situation.

[0070] (5) Instruction execution

[0071] Alarm instruction: When the system host determines an abnormal situation, it immediately issues an alarm signal. The dynamic alarm screen of the human-computer interaction module displays the alarm information, and at the same time, it automatically gives a voice prompt when someone approaches;

[0072] Alarm contact closure: The normally open alarm contact of the human-computer interaction module closes, triggering the external audible and visual alarm device to emit a strong audible and visual warning;

[0073] First-level response: The system host sends an instruction to the ventilation control module to start the fan and calculate the power;

[0074] Second-level response: The system host ventilation control module starts the fan to operate at the maximum power. The fan controller increases the voltage regulation intensity to make the fan operate at full load and fully ventilate and exchange air;

[0075] Over-temperature response: The ventilation control module starts the forced exhaust function and operates the fan at the maximum power to quickly reduce the indoor temperature;

[0076] Feedback regulation: The ventilation control module continuously feeds back the operating status of the fan to the system host, and the system host further dynamically adjusts the ventilation strategy based on the feedback information to achieve closed-loop control;

[0077] (6) Data storage and transmission

[0078] Data storage: The memory in the system host stores the monitoring data in partitions according to data types. The original SF 6 concentration data is marked with the sampling frequency and timestamp; the alarm event log records the trigger time, concentration value, and the fan response action; the system self-check report generates a device status verification file every day;

[0079] Data transmission: The data communication module uploads the monitoring data to the upper computer through Ethernet, RS232, or RS485 communication methods. The upper computer stores and analyzes the data to achieve the remote monitoring function.

[0080] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or equivalent changes and modifications within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A leakage detection system based on sulfur hexafluoride gas, characterized in that: The system consists of: multi-channel gas detection module, system host, ventilation control module, human-computer interaction module, data communication module; The multi-channel gas detection module consists of a gas transmitter and a temperature and humidity transmitter, which collects gas and environmental data in real time and transmits the data directly to the system host for analysis and processing; The system host is used to receive data from the detection module, analyze and judge the data, and has a built-in processor and memory to dynamically control the fan power according to the concentration data; The built-in fan controller in the ventilation control module is linked with the system host, automatically adjusts the fan power after receiving the control command, supports over-temperature linkage control, and starts forced exhaust when the ambient temperature exceeds the temperature detection range of -20℃-99℃; The human-computer interaction module is equipped with a liquid crystal display and a dynamic alarm screen, wherein the liquid crystal display is used to display real-time data of SF6 gas content, oxygen content, temperature and humidity in the environment, and the dynamic alarm screen is used to display the on-site monitoring status, and can automatically give voice prompts when human body senses, and at the same time, it has a normally open alarm contact output function for external sound and light alarm equipment; The data communication module supports multi-mode communication of Ethernet, RS232 and RS485, uploads the monitoring data to the host computer, and realizes remote monitoring and GIS leakage point positioning functions.

2. A leakage detection system based on sulfur hexafluoride gas according to claim 1, characterized in that: The gas transmitter in the multi-channel gas detection module contains an SF6 gas sensor and an oxygen sensor, and the temperature and humidity transmitter contains a temperature sensor and a humidity sensor, wherein: The SF6 gas sensor is used to detect the SF6 gas content in the environment; The oxygen sensor is used to obtain oxygen content data; The temperature sensor is used to detect temperature data in the environment; The humidity sensor is used to detect humidity data in the environment.

3. A leakage detection system based on sulfur hexafluoride gas according to claim 2, characterized in that: The detection range of the SF6 gas sensor in the multi-channel gas detection module is 0-2000ppm, the minimum leakage alarm point is 10ppm, and the alarm threshold is 50-1500ppm; The detection range of the oxygen sensor is 1.0%-25.0%, the detection accuracy is less than 0.5%, and the hypoxia alarm threshold is set to 18% by default.

4. A leakage detection system based on sulfur hexafluoride gas according to claim 1, characterized in that: When the processor of the system host detects that the SF6 gas content in the environment exceeds the alarm threshold and the oxygen content is lower than the hypoxia alarm threshold, the host immediately sends an alarm signal and sends a control instruction to the fan controller to automatically start the fan for ventilation. It supports timed exhaust and forced exhaust functions, and dynamically adjusts the ventilation strategy according to the SF6 concentration change rate ΔC / Δt.

5. A leakage detection system based on sulfur hexafluoride gas according to claim 4, characterized in that: The system host receives the SF6 gas concentration data C transmitted by the multi-channel gas detection module, and records the time t corresponding to each data, and calculates the concentration gradient ΔC / Δt according to the time interval Δt, where ΔC=C t -C t-1 , C t is the gas concentration at the current moment, C t-1 is the gas concentration at the previous moment, then the gas concentration change rate Combined with the SF6 gas sensor alarm threshold of 50-1500ppm, a dynamic ventilation strategy is formulated to send control signals to the ventilation control module.

6. A leakage detection system based on sulfur hexafluoride gas according to claim 5, characterized in that: The logic judgment rule for dynamically adjusting the ventilation strategy is: First Response: When C t >50ppm and ΔC / Δt>10ppm / s, it is judged as a sudden leakage and the fan is started at 50% power; Secondary response: When C t When either >1000ppm or ΔC / Δt>50ppm / s is met, it is considered a serious leak and the fan is started at 100% power; Steady-state control: When C t When <50ppm and ΔC / Δt<1ppm / s, the fan maintains 10% basic ventilation power.

7. A leakage detection system based on sulfur hexafluoride gas according to claim 1, characterized in that: After receiving the control command, the fan controller of the ventilation control module monitors the fan load current I in real time, adjusts the fan motor input voltage V to change the output power P=I×V, and feeds back to the system host to dynamically adjust the ventilation strategy for closed-loop control.

8. A leakage detection system based on sulfur hexafluoride gas according to claim 1, characterized in that: The memory in the system host is used for real-time caching of monitoring data and backup of historical records. Its capacity is 1 million and 10 million records, and is partitioned and stored according to data type, including: SF6 concentration raw data: sampling frequency, timestamp; Alarm event log: record trigger time, concentration value, and fan response action; System self-check report: Generate equipment status verification files daily.

Images