Gas leakage detection system of unattended substation

Abstract

The utility model provides a gas leakage detection system of an unattended substation. The system comprises a plurality of gas concentration sensors, a fusion terminal device, a monitoring device, an inspection robot and an exhaust device. The gas concentration sensor is used for detecting the gas concentration of the set gas and transmitting the gas concentration to the monitoring equipment through the fusion terminal equipment; the monitoring equipment is used for triggering the inspection robot to carry out overall gas concentration detection on the leakage position when the gas concentration transmitted by any gas concentration sensor exceeds a preset threshold value; the inspection robot is used for transmitting the overall gas concentration detection result to the monitoring equipment; the monitoring device is further used for triggering the exhaust device to start to operate when the overall gas concentration detection result is light leakage and triggering the exhaust device to stop operating when the overall gas concentration detection result is normal. According to the utility model, the gas leakage detection accuracy of the transformer substation is improved, and the intelligent level of safety management control of the transformer substation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas leakage detection of transformer substations, in particular to a gas leakage detection system of unattended transformer substations. Background Art

[0002] In the past decade, with the continuous improvement of power transmission voltage levels at home and abroad, the continuous expansion of power grid scale, the rapid growth of the number of SF6 insulated electrical equipment in operation and the use of SF6 gas, higher requirements have been put forward for the safety of SF6 gas insulated electrical equipment, and major challenges have been brought to greenhouse gas emission reduction. At present, there is no complete alternative to SF6 as an insulating gas for power equipment. Improving the accuracy and practicality of SF6 gas leak detection technology and continuously developing the application methods of SF6 leak detection technology are of great significance to ensuring the safe and stable operation of the power grid and alleviating environmental and climate problems.

[0003] Rapidly and accurately locating SF6 leakage points and taking measures are the core issues to ensure the stable operation of the power grid. Existing gas leakage detection technology for electrical equipment usually only uses sensors to detect the concentration of leaked gas. Since the sensor is set in a fixed position, when the sensor fails or the propagation path of the leaked gas does not change, the sensor's detection value cannot truly reflect the actual gas concentration in the substation. It is easy to have a large gas concentration detection error, which reduces the accuracy of gas leakage detection in the substation. When there is a gas leak in the substation, it is impossible to carry out safety management and control in time, and the intelligence level is low. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a gas leakage detection system for an unmanned substation, which realizes the intelligent detection of the substation. When there is a gas leakage, the exhaust device is automatically triggered to perform exhaust treatment to reduce the concentration of leaked gas in the substation, so as to facilitate maintenance personnel to carry out timely repairs on the leakage location, ensure the safety of maintenance personnel, and improve the intelligent level of safety management and control of the substation.

[0005] In order to achieve the above purpose, the technical solution adopted by the embodiment of the utility model is as follows:

[0006] In a first aspect, an embodiment of the utility model provides a gas leakage detection system for an unattended substation, including: a plurality of gas concentration sensors, a fusion terminal device, a monitoring device, a patrol robot and an exhaust device;

[0007] Each of the gas concentration sensors is arranged at a plurality of set positions in the substation, each of the infrared sensors is communicatively connected with the fusion terminal device, and the fusion terminal device is communicatively connected with the monitoring device;

[0008] The gas concentration sensor is used to detect the gas concentration of the set gas, and transmit the gas concentration to the monitoring device via the fusion terminal device;

[0009] The monitoring device is used to trigger the inspection robot to perform overall gas concentration detection on the leakage location when the gas concentration transmitted by any of the gas concentration sensors exceeds a preset threshold;

[0010] The inspection robot is used to transmit the overall gas concentration detection result to the monitoring device;

[0011] The monitoring device is also used to trigger the exhaust device to start running when the overall gas concentration detection result is a slight leakage, and to trigger the exhaust device to stop running when the overall gas concentration detection result is normal.

[0012] Further, the embodiment of the utility model provides a first possible implementation of the first aspect, wherein the gas leakage detection system for the unattended substation further includes: a gas recovery device;

[0013] The monitoring device is also used to trigger the gas recovery device to start running when the overall gas concentration detection result is a severe leak, trigger the gas recovery device to shut down when the overall gas concentration detection result becomes a slight leak, and trigger the exhaust device to start running.

[0014] Further, the embodiment of the utility model provides a second possible implementation of the first aspect, wherein the gas leakage detection system for the unattended substation further includes: an alarm;

[0015] The fusion terminal device is used to trigger the alarm to sound an alarm when the gas concentration transmitted by any of the gas concentration sensors exceeds a preset threshold.

[0016] Further, the embodiment of the utility model provides a third possible implementation of the first aspect, wherein the gas leakage detection system for the unattended substation further includes: a prompt device;

[0017] The monitoring device is also used to trigger the prompt device to issue a prompt prohibiting personnel from entering the substation when the overall gas concentration detection result is the slight leakage or the severe leakage;

[0018] The monitoring device is also used to trigger the prompt device to issue a prompt to allow personnel to enter the substation when the overall gas concentration detection result is normal.

[0019] Furthermore, an embodiment of the utility model provides a fourth possible implementation of the first aspect, wherein the monitoring device is also used to trigger the inspection robot to perform periodic inspections in the substation when the gas concentration transmitted by the gas concentration sensor is less than the preset threshold.

[0020] Furthermore, the embodiment of the utility model provides a fifth possible implementation of the first aspect, wherein the gas concentration sensor is a SF6 infrared sensor, and the SF6 infrared sensor and the inspection robot are equipped with a SF6 infrared spectrometer.

[0021] Further, the embodiment of the utility model provides a sixth possible implementation of the first aspect, wherein the converged terminal device includes a plurality of sensor interfaces, a monitoring interface and a power module;

[0022] The sensor interface is used to be electrically connected to each of the gas concentration sensors; the monitoring interface is used to be electrically connected to the monitoring device; and the power module is used to supply power to the fusion terminal device and the gas concentration sensor.

[0023] Furthermore, the embodiment of the utility model provides a seventh possible implementation of the first aspect, wherein the fusion terminal device also includes a linkage interface, and the linkage interface is used to electrically connect to the exhaust device, the gas recovery equipment and the alarm respectively.

[0024] Furthermore, an embodiment of the utility model provides an eighth possible implementation scheme of the first aspect, wherein the monitoring device includes a fusion terminal port, a display module and a power module; the fusion terminal port is used to be electrically connected to the fusion terminal device; the display module is used to display the gas concentration detected by the gas concentration sensor and the overall gas concentration detection results of the inspection robot, and the power module is used to power the monitoring device.

[0025] An embodiment of the utility model provides a gas leakage detection system for an unmanned substation, the system comprising: a plurality of gas concentration sensors, a fusion terminal device, a monitoring device, a patrol robot and an exhaust device; each gas concentration sensor is arranged at a plurality of set positions in the substation, each infrared sensor is communicatively connected with the fusion terminal device, and the fusion terminal device is communicatively connected with the monitoring device; the gas concentration sensor is used to detect the gas concentration of the set gas, and transmit the gas concentration to the monitoring device via the fusion terminal device; the monitoring device is used to trigger the patrol robot to perform overall gas concentration detection on the leakage position when the gas concentration transmitted by any gas concentration sensor exceeds a preset threshold value; the patrol robot is used to transmit the overall gas concentration detection result to the monitoring device; the monitoring device is also used to trigger the exhaust device to start running when the overall gas concentration detection result is a slight leakage, and to trigger the exhaust device to stop running when the overall gas concentration detection result is normal. The utility model can accurately detect the overall leakage situation by using the inspection robot to perform leakage gas quantitative detection on the gas leakage point when the gas concentration sensor detects a gas leakage, thereby improving the gas leakage detection accuracy of the substation and realizing intelligent detection of the substation. When there is a gas leakage, the exhaust device is automatically triggered to perform exhaust treatment to reduce the concentration of the leaked gas in the substation, so as to facilitate maintenance personnel to carry out timely repairs on the leakage location, ensure the safety of the maintenance personnel, and improve the intelligent level of safety management and control of the substation.

[0026] Other features and advantages of the embodiments of the present utility model will be described in the subsequent description, or some features and advantages can be inferred or determined without doubt from the description, or can be learned by implementing the above-mentioned technology of the embodiments of the present utility model.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of a gas leakage detection system for an unattended substation provided by an embodiment of the utility model is shown;

[0030] Figure 2A schematic diagram of the structure of another gas leakage detection system for an unattended substation provided by an embodiment of the utility model is shown;

[0031] Figure 3 The following is a diagram showing the imaging principle of an SF6 infrared spectrum imager provided by an embodiment of the utility model;

[0032] Figure 4 A schematic diagram of a SF6 infrared spectrum imaging instrument detection provided by an embodiment of the utility model is shown;

[0033] Figure 5 A schematic diagram of the structure of a converged terminal device provided by an embodiment of the utility model is shown;

[0034] Figure 6 A schematic diagram of the structure of a monitoring device provided by an embodiment of the utility model is shown;

[0035] Figure 7 A flow chart of a gas leakage detection method for an unattended substation provided by an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments.

[0037] At present, quickly and accurately locating SF6 leakage points and taking measures are the core issues to ensure the stable operation of the power grid.

[0038] With the increasing attention paid to the leakage of electrical equipment and the rapid progress of detection technology, there are many methods for detecting SF6 gas leakage, including: soap bubble detection method, wrapping detection method, halogen effect detection method, thermal conductivity detection method, electrochemical method, high-voltage corona detection method, laser detection method and infrared detection method.

[0039] Soap water detection method: Apply soap water to the part with suspected leakage source, and observe whether the soap water produces bubbles to judge whether there is leakage of SF6 gas. The advantage of this detection method is that it can be used when the equipment is running, does not require instrument assistance, is low in cost, and is simple and easy to use.

[0040] Wrapping detection method: Use sealing cloth or plastic film to wrap the suspected leak source close to the equipment, and observe whether there is any protrusion in the sealing cloth or sealing film to determine whether there is a leak. This detection method is low-cost and simple to operate.

[0041] Halogen effect method: This detection method can be used for quantitative detection as well as qualitative detection, but it can only be used to locate areas with high SF6 gas concentrations on site. It has unstable performance, large workload, and is easily affected by the environment.

[0042] Thermal conductivity detection method: Carrier gases with different components have different thermal conductivity systems. When the gas to be measured enters the thermal conductivity cell of the thermal conductivity detector, its thermal conductivity resistance changes accordingly, causing the internal bridge balance to be broken. The output voltage value of the bridge can be detected to reflect the condition of the gas to be measured.

[0043] Electrochemical detection method: Under the condition of 200℃, SF6 gas will react chemically and send out electrical signals, which can be used to judge whether there is SF6 leakage in electrical equipment. It has good stability, and since the electrical signals will differ with the change of SF6 concentration, quantitative detection of SF6 gas can be achieved.

[0044] High-voltage corona discharge detection method: The current generated by high-voltage corona discharge will change with the concentration of SF6 gas in the air. Therefore, by detecting the size of this discharge current, the concentration of SF6 leakage in the electrical equipment can be inferred.

[0045] Laser detection method: Since the atomic arrangement of SF6 molecules is S atoms in the center and F atoms scattered around the S atoms, it has a stronger negative polarity, and the surrounding free electrons produce a strong adsorption force. The detection instrument scans the object to be detected by emitting a laser of a specific wavelength (wavelength is 10.6μm). There is a difference in absorption between the object to be detected and the background, and there is also a difference in the number of photons reflected to the detector. After video digital image processing, a smoky shadow appears on the display.

[0046] Existing SF6 gas leakage detection methods all have shortcomings and deficiencies, and it is difficult to achieve stable and effective online real-time monitoring in the power grid, especially the lack of intelligent detection technology for SF6 leakage in unmanned substations. Therefore, there is an urgent need for a SF6 gas leakage detection method with high stability, strong reliability, simplicity and practicality, low cost, high efficiency and stability that can be applied to substations, and even more so a solution for intelligent detection technology for unmanned substations.

[0047] At present, the SF6 gas leakage detection technology for unmanned substations usually uses electrochemical or optical SF6 sensors, which are installed at locations prone to leakage and transmitted to the monitoring platform in the monitoring room through signal lines. When SF6 gas leakage occurs at a certain location on site, the sensor at that location triggers the alarm threshold, uploads the signal to the monitoring platform and alarms. The existing SF6 gas leakage detection technology for unmanned substations can realize functions such as real-time monitoring, remote control, and leakage threshold alarm, but it cannot realize intelligent functions such as quantitative monitoring of leaked gas and leakage point search. This limits the unmanned management of smart substations, and the level of intelligence needs to be improved urgently.

[0048] In order to improve the above problems, an embodiment of the utility model provides a gas leakage detection system for an unmanned substation. The embodiment of the utility model is introduced in detail below.

[0049] This embodiment provides a gas leakage detection system for an unmanned substation. Figure 1 The structure diagram of the gas leakage detection system of the unattended substation shown in the figure includes: a plurality of gas concentration sensors 11, a fusion terminal device 12, a monitoring device 13, an inspection robot 14 and an exhaust device 15;

[0050] The gas concentration sensors 11 are arranged at multiple locations in the substation, such as Figure 1 As shown, each infrared sensor 11 is communicatively connected with the fusion terminal device 12, and the fusion terminal device 12 is communicatively connected with the monitoring device 13; the above-mentioned set positions may be locations in the substation where gas leakage is prone to occur and other locations where gas leakage needs to be detected, such as the joints of electrical equipment, valves, pressure gauges and flanges.

[0051] The gas concentration sensor 11 is used to detect the gas concentration of a set gas and transmit the gas concentration to the monitoring device via the fusion terminal device; the above-mentioned set gas can be any gas in the substation that needs to be detected for leakage, such as SF6 gas. Since the density of SF6 gas is greater than that of air, the above-mentioned set position can be below the position where gas leakage is likely to occur, so that the sensor can accurately detect whether there is a gas leakage at that position.

[0052] The monitoring device 13 is used to trigger the inspection robot 14 to perform overall gas concentration detection at the leakage location when the gas concentration transmitted by any gas concentration sensor 11 exceeds a preset threshold value;

[0053] The above-mentioned fusion terminal device 12 can be installed at a specific location on the substation site to aggregate the information of various sensors on site. Each gas concentration sensor 11 transmits the detected gas concentration to the fusion terminal device 12. The fusion terminal device 12 uploads the gas concentration detected by each sensor to the monitoring device 13. The monitoring device 13 determines whether the gas concentration detected by each sensor exceeds a preset threshold value. The preset threshold value can be the gas concentration detected by the sensor when a gas leak occurs.

[0054] The fusion terminal device 12 communicates with the monitoring device 13 in a two-way manner, such as Figure 1 As shown, the fusion terminal device 12 is connected to the inspection robot 14 for communication. When the monitoring device 13 detects that the gas concentration transmitted by any gas concentration sensor 11 exceeds the preset threshold, it will issue a detection command to the fusion terminal device 12. The fusion terminal device 12 transmits the detection command to the inspection robot 14, so that the inspection robot 14 starts to detect gas leakage information near the leakage location. In another embodiment, the above-mentioned monitoring device 13 can also wirelessly communicate with the inspection robot 14 to directly transmit the detection command to the inspection robot 14.

[0055] The above-mentioned inspection robot 14 is used to transmit the overall gas concentration detection result to the monitoring device 13; after receiving the detection command, the inspection robot 14 moves to the gas leakage location (the location is the location of the gas concentration sensor where the gas concentration exceeds the preset threshold), detects the gas concentration distribution information and / or gas leakage amount information near the gas leakage location, so as to detect the overall gas concentration information of the substation, and transmits the detected gas concentration detection result to the monitoring device 13.

[0056] The monitoring device 13 is also used to trigger the exhaust device 15 to start running when the overall gas concentration detection result is a slight leak, and to trigger the exhaust device 15 to stop running when the overall gas concentration detection result is normal. The exhaust device may include a plurality of exhaust fans.

[0057] The monitoring device 13 determines the severity of the gas leakage at the location based on the overall gas concentration detection result of the inspection robot 14. When it is judged to be a slight leakage, it indicates that there is a gas leakage at the location but the degree is relatively light. The exhaust device 15 is controlled to start running to reduce the concentration of the leaked gas in the substation so that the operation and maintenance personnel can safely enter the substation for maintenance. When the leakage location is repaired and the inspection robot 14 detects that the overall gas concentration in the substation has dropped to a safe concentration, the monitoring device 13 controls the inspection robot 14 and the exhaust device 15 to stop running so that the inspection robot returns to its position.

[0058] The gas leakage detection system for the unmanned substation provided in the present embodiment can accurately detect the overall leakage situation by performing quantitative detection of the leaked gas at the gas leakage point through the inspection robot when the gas concentration sensor detects a gas leakage, thereby improving the gas leakage detection accuracy of the substation and realizing intelligent detection of the substation. When there is a gas leakage, the exhaust device is automatically triggered to perform exhaust treatment to reduce the concentration of the leaked gas in the substation, so as to facilitate maintenance personnel to carry out timely repairs on the leakage location, thereby ensuring the safety of the maintenance personnel and improving the intelligent level of safety management and control of the substation.

[0059] In one embodiment, see Figure 2 Another structural schematic diagram of a gas leakage detection system for an unmanned substation is shown. The gas leakage detection system for an unmanned substation provided in this embodiment further includes: a gas recovery device 16;

[0060] The monitoring device 13 is also used to trigger the gas recovery device 16 to start running when the overall gas concentration detection result is a severe leak, trigger the gas recovery device to shut down when the overall gas concentration detection result becomes a slight leak, and trigger the exhaust device 15 to start running.

[0061] The monitoring device 13 determines the severity of the gas leakage at the location based on the overall gas concentration detection result of the inspection robot 14. When it is determined to be a severe leakage, it indicates that the gas leakage at the location is serious and the concentration of the leaked gas is large. The monitoring device 13 sends a gas recovery instruction to the fusion terminal device 12, and the fusion terminal device 12 transmits the gas recovery instruction to the gas recovery device 16, so that the gas recovery device 16 recovers the leaked gas of the substation to avoid polluting the environment when the gas leakage is serious. When the monitoring device 13 determines that the severity of the gas leakage at the location has become mild based on the overall gas concentration detection result of the inspection robot 14, the exhaust device is controlled to start exhausting, further reducing the concentration of leaked gas in the substation, purifying the air in the substation, so that the operation and maintenance personnel can safely enter the substation to repair the leakage location. When the repair is completed, the inspection robot 14 detects that the overall gas concentration detection result is normal, and the monitoring device 13 controls the exhaust device to stop working, and controls the inspection robot 14 to stop working and return to its position.

[0062] In one embodiment, the gas leakage detection system for an unmanned substation provided in this embodiment further includes: an alarm 17;

[0063] The fusion terminal device 12 is used to trigger the alarm 17 to sound an alarm when the gas concentration transmitted by any gas concentration sensor 11 exceeds a preset threshold.

[0064] There may be multiple alarms 17 , which are respectively arranged near the positions of the gas concentration sensors. The alarm may be an audible and visual alarm, which can emit sound and light prompts when an alarm is sounded.

[0065] After obtaining the gas concentration transmitted by each gas concentration sensor 11, the fusion terminal device 12 determines whether the gas concentration detected by each sensor exceeds the preset threshold. When the gas concentration of a certain sensor exceeds the preset threshold, the alarm at that location is triggered to sound an alarm to indicate the location of the gas leakage, and at the same time prompt the staff to inspect the leakage location in time.

[0066] In one embodiment, the gas leakage detection system for an unattended substation provided in this embodiment further includes: a prompting device;

[0067] The monitoring equipment is also used to trigger the prompt device to issue a prompt prohibiting personnel from entering the substation when the overall gas concentration detection result is a slight leak or a severe leak;

[0068] The monitoring equipment is also used to trigger the prompt device to issue a prompt to allow personnel to enter the substation when the overall gas concentration detection result is normal.

[0069] When the monitoring equipment determines that the current gas leakage is a slight leakage or a severe leakage according to the overall gas concentration detection result of the inspection robot, it indicates that the concentration of the leaked gas in the air in the substation is relatively high. For the safety of the staff, the control prompt device issues a prompt prohibiting personnel from entering the substation. At this time, the operation and maintenance personnel cannot enter the substation; when the concentration of the gas recovered by the recovery equipment and / or the leaked gas exhausted by the exhaust device is close to 0, the monitoring equipment determines that there is no abnormality according to the overall gas concentration detection result of the inspection robot, and the monitoring equipment controls the prompt device to issue a prompt allowing personnel to enter the substation. At this time, the operation and maintenance personnel can enter the substation for maintenance, thereby ensuring the safety of the operation and maintenance personnel.

[0070] In one embodiment, the monitoring device of the unmanned substation provided in this embodiment is also used to trigger the inspection robot to perform periodic inspections in the substation when the gas concentration transmitted by the gas concentration sensor is less than a preset threshold. The inspection robot can be a wheeled robot or a track robot, which is provided with an obstacle avoidance device and stores the inspection path of the substation where gas leakage detection is required, so as to perform periodic automatic inspections on the substation according to the set time interval.

[0071] When the gas concentration detected by the gas concentration sensors at each location is less than the preset threshold, it indicates that there is no gas leakage. The gas concentration sensor transmits the detected gas concentration to the fusion terminal device and uploads it to the monitoring device. At this time, the inspection robot, alarm, exhaust device and gas recovery equipment are all in a non-working state. When the unmanned substation periodic inspection or safety inspection task is issued, the inspection robot performs inspection and detection work in the substation as needed, and uploads the detection data to the fusion terminal device, and finally uploads it to the monitoring device, which analyzes, evaluates and saves the data.

[0072] In one embodiment, the gas concentration sensor provided in this embodiment is a SF6 infrared sensor, and the SF6 infrared sensor and the inspection robot are equipped with a SF6 infrared spectroscopic imager. The above-mentioned gas recovery equipment can be a SF6 recovery equipment.

[0073] The above-mentioned SF6 infrared sensor and inspection robot are equipped with SF6 infrared spectrum imager, see Figure 3 The imaging principle diagram of the SF6 infrared spectrometer shown in the figure is based on the gas absorption theory. Different gas molecules have different energy level structures and will selectively absorb energy of specific wavelengths of light. When the infrared radiation emitted by the infrared light source is absorbed by a certain concentration of the gas to be measured, the light intensity at a specific wavelength will change corresponding to the gas concentration. The change pattern satisfies the (Lambert-Beer) absorption law, and the gas concentration can be calculated based on the change in light intensity.

[0074] SF6 infrared gas sensor is based on the above principle and uses a broad-spectrum infrared light source. The structure of SF6 infrared gas sensor does not have a spectroscopic grating or prism structure, so it is called non-spectroscopic infrared. The sensor consists of an infrared light source, an optical path, an infrared detector, a circuit and software. It adopts a dual-channel measurement scheme, combined with a narrow-band filter and a two-way detector. By comparing the detected light signals, the concentration is calculated. It is mainly used to measure the concentration of compounds such as CH4, CO2, N2O, CO, SO2, NH3, H2S, ethanol and benzene, and includes most organic substances. Compared with traditional electrochemical and single-channel measurement schemes, SF6 infrared gas sensors have a long service life, high detection accuracy, little external influence, and fast response, while electrochemical sensors have slow response, are easily poisoned, and have a short service life.

[0075] When the infrared rays radiated from the surface of an object pass through SF6 gas, most of the infrared rays with a wavelength of 10.4 to 10.6 μm are absorbed. The principle of SF6 gas infrared imaging leak detection is to use infrared light with a wavelength of 10.3 to 10.7 μm to form an image. Figure 4As shown in the schematic diagram of SF6 infrared spectrum imaging detection, the infrared rays radiated from the surface of the object, which pass through the air, all enter the lens, while the part that passes through the SF6 leaking gas is absorbed in large quantities, and only a small amount enters the lens. Therefore, smoke-like SF6 leaking gas can be seen after imaging. The infrared imaging leak detection principle is applied to SF6 gas leakage, which has a very intuitive and good detection effect. The superior performance of infrared imaging equipment has high detection accuracy, good practicality, and strong anti-interference ability. When the equipment is energized, you do not need to touch the equipment, just observe the outer surface of each part of the equipment from a distance, and you can quickly find very subtle leaks on the surface of the equipment.

[0076] In one embodiment, the fusion terminal device provided in this embodiment includes multiple sensor interfaces, monitoring interfaces and a power module; the sensor interface is used to be electrically connected to each gas concentration sensor; the monitoring interface is used to be electrically connected to the monitoring device; the power module is used to power the fusion terminal device and the gas concentration sensor.

[0077] In one embodiment, the fusion terminal device provided in this embodiment further includes a linkage interface, which is used to electrically connect to the exhaust device, the gas recovery device and the alarm respectively.

[0078] In one embodiment, see Figure 5 The fusion terminal device structure diagram shown in the figure, the fusion terminal device provided in this embodiment includes: multiple sensor interfaces, communication modules, computing modules, control modules, power modules, platform ports and linkage ports. Among them, the sensor interface is compatible with most sensor communication and power supply connections on the market, the storage module has the function of local information cycle storage, the communication module has multiple communication protocol conversion and information communication functions, the computing module can perform front-end sensor information edge computing preprocessing (such as determining whether the detection value of each gas concentration sensor exceeds the preset threshold), the control module can control the switch of each sensor interface and the issuance of on-site alarm linkage commands, the power module provides power supply for the sensors of the intelligent fusion terminal device, the platform port is the communication port connected to the monitoring platform, and the linkage port is the port connected to the linkage device (including alarm, exhaust device and gas recovery equipment). According to the conditions of the project site, one or more intelligent fusion terminal devices are installed to summarize the information of local domain sensors and upload them to the monitoring equipment.

[0079] In one embodiment, the monitoring device provided in this embodiment includes a fusion terminal port, a display module and a power module; the fusion terminal port is used to be electrically connected to the fusion terminal device; the display module is used to display the gas concentration detected by the gas concentration sensor and the overall gas concentration detection results of the inspection robot, and the power module is used to power the monitoring device.

[0080] In one embodiment, see Figure 6The schematic diagram of the monitoring device structure shown in the figure shows that the monitoring device provided in this embodiment includes: a fusion terminal port, a storage module, a communication module, a computing module, a control module, a power module, a business module and a display module. Among them, the fusion terminal port is a port for connecting and communicating with the fusion terminal device, the storage module has the function of long-term storage of massive information, the communication module is responsible for the security and control of information communication with the fusion terminal device, the computing module can perform intelligent computing and processing of aggregated sensor information and business information, the control module can control the switch of external communication and the issuance of alarm linkage commands, the power module provides power supply for the monitoring device, the business module is the various business parameter architectures required by the substation, and the display module is used to display business and equipment information. The monitoring device directly conducts two-way communication with the fusion terminal device, receives the engineering site information uploaded by the fusion terminal device, and issues various control commands after calculation, analysis and evaluation by the monitoring device.

[0081] The gas leakage detection system for the unmanned substation provided in this embodiment improves the detection accuracy of gas concentration by using SF6 infrared sensors to detect gas concentration, has strong anti-interference ability, can realize long-distance trace gas leakage detection, and improves the reliability and response speed of the system. It provides feasible and reliable technology for regular inspection and fault detection of unmanned substations, provides intelligent, visual, automated, and digital technical solutions for power detection, and provides technical support for the development of smart grids.

[0082] Corresponding to the gas leakage detection system for the unmanned substation provided in the above embodiment, this embodiment provides a gas leakage detection method for an unmanned substation, which is applied to the gas leakage detection system for the unmanned substation provided in the above embodiment, see Figure 7 The flow chart of the gas leakage detection method for an unattended substation shown in FIG. 1 mainly includes the following steps:

[0083] Step S702, detecting the gas concentration of a set gas based on a gas concentration sensor;

[0084] Step S704, when the gas concentration transmitted by any gas concentration sensor exceeds a preset threshold, triggering the inspection robot to perform overall gas concentration detection at the leakage location;

[0085] Step S706, transmitting the overall gas concentration detection result to the monitoring device via the fusion terminal device;

[0086] Step S708, when the overall gas concentration detection result is a slight leakage, the exhaust device is triggered to start running, and when the overall gas concentration detection result is normal, the exhaust device is triggered to stop running.

[0087] The gas leakage detection method for the unmanned substation provided in the present embodiment can accurately detect the overall leakage situation by performing quantitative detection of the leaked gas at the gas leakage point through the inspection robot when the gas concentration sensor detects a gas leakage, thereby improving the gas leakage detection accuracy of the substation and realizing intelligent detection of the substation. When there is a gas leakage, the exhaust device is automatically triggered to perform exhaust treatment to reduce the concentration of the leaked gas in the substation, so as to facilitate maintenance personnel to carry out timely repairs on the leakage location, thereby ensuring the safety of the maintenance personnel and improving the intelligent level of safety management and control of the substation.

[0088] In one embodiment, the method provided in this embodiment also includes: triggering the gas recovery equipment to start running when the overall gas concentration detection result is a severe leakage, triggering the gas recovery equipment to shut down when the overall gas concentration detection result becomes a slight leakage, and triggering the exhaust device to start running.

[0089] In one embodiment, the above-mentioned overall gas concentration detection result includes gas concentration distribution information and gas leakage amount. The method provided in this embodiment further includes: determining the average gas concentration of the substation based on the gas concentration distribution information, and when the average gas concentration is greater than the first concentration and less than the second concentration and the gas leakage amount is greater than the first preset leakage amount and less than the second preset leakage amount, determining that the overall gas concentration detection result is a slight leakage;

[0090] When the average gas concentration is less than the first concentration and the gas leakage amount is less than the first preset leakage amount, it is determined that the overall gas concentration detection result is normal.

[0091] In one embodiment, the present embodiment provides a step of determining a severe leakage, including: when the average gas concentration is greater than a second concentration and the gas leakage amount is greater than a second preset leakage amount, determining that the overall gas concentration detection result is a severe leakage.

[0092] The above-mentioned first concentration, second concentration, first preset leakage amount and second preset leakage amount can be determined according to the requirements of the substation for leakage gas, the space size and air circulation conditions of the substation, and the threshold settings of each substation may be different.

[0093] The implementation principle and technical effects of the method provided in this embodiment are the same as those of the aforementioned embodiments. For the sake of brief description, for matters not mentioned in the method embodiment, reference may be made to the corresponding contents in the aforementioned system embodiment.

[0094] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system described above can refer to the corresponding process in the aforementioned embodiment, and will not be repeated here.

[0095] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0096] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0097] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A gas leakage detection system for an unmanned substation, characterized in that: include: Multiple gas concentration sensors, fusion terminal equipment, monitoring equipment, inspection robots and exhaust devices; Each of the gas concentration sensors is arranged at a plurality of set positions in the substation, each of the gas concentration sensors is communicatively connected to the fusion terminal device, and the fusion terminal device is communicatively connected to the monitoring device; The gas concentration sensor is used to detect the gas concentration of the set gas, and transmit the gas concentration to the monitoring device via the fusion terminal device; The monitoring device is used to trigger the inspection robot to perform overall gas concentration detection on the leakage location when the gas concentration transmitted by any of the gas concentration sensors exceeds a preset threshold; The inspection robot is used to transmit the overall gas concentration detection result to the monitoring device; The monitoring device is also used to trigger the exhaust device to start running when the overall gas concentration detection result is a slight leakage, and to trigger the exhaust device to stop running when the overall gas concentration detection result is normal.

2. The system according to claim 1, characterized in that Also includes: Gas recovery equipment; The monitoring device is also used to trigger the gas recovery device to start running when the overall gas concentration detection result is a severe leak, trigger the gas recovery device to shut down when the overall gas concentration detection result becomes a slight leak, and trigger the exhaust device to start running.

3. The system according to claim 2, characterized in that Also includes: Alarm; The fusion terminal device is used to trigger the alarm to sound an alarm when the gas concentration transmitted by any of the gas concentration sensors exceeds a preset threshold.

4. The system according to claim 2, characterized in that Also included: a prompting device; The monitoring device is also used to trigger the prompt device to issue a prompt prohibiting personnel from entering the substation when the overall gas concentration detection result is the slight leakage or the severe leakage; The monitoring device is also used to trigger the prompt device to issue a prompt to allow personnel to enter the substation when the overall gas concentration detection result is normal.

5. The system according to claim 1, characterized in that The monitoring device is also used to trigger the inspection robot to perform periodic inspections in the substation when the gas concentrations transmitted by the gas concentration sensors are all less than the preset threshold value.

6. The system according to claim 1, characterized in that The gas concentration sensor is a SF6 infrared sensor, and the SF6 infrared sensor and the inspection robot are equipped with a SF6 infrared spectroscopic imager.

7. The system according to claim 3, characterized in that The fusion terminal device includes multiple sensor interfaces, monitoring interfaces and power modules; The sensor interface is used to be electrically connected to each of the gas concentration sensors; the monitoring interface is used to be electrically connected to the monitoring device; and the power module is used to supply power to the fusion terminal device and the gas concentration sensor.

8. The system according to claim 7, characterized in that The fusion terminal device also includes a linkage interface, which is used to be electrically connected to the exhaust device, the gas recovery device and the alarm respectively.

9. The system according to claim 1, characterized in that The monitoring device includes a fusion terminal port, a display module and a power module; the fusion terminal port is used to be electrically connected to the fusion terminal device; the display module is used to display the gas concentration detected by the gas concentration sensor and the overall gas concentration detection results of the inspection robot, and the power module is used to power the monitoring device.

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