Protection system for preventing leakage of SF6 electrical equipment

Abstract

A protection system for preventing leakage of SF6 electrical equipment is characterized in that a closed protective cover is mounted outside the SF6 electrical equipment to form a closed space for preventing SF6 gas in the SF6 electrical equipment from leaking to the external environment. Besides, through the arrangement of a gas extraction device, a gas detection device, a gas temporary storage device and a corresponding control device, automatic sampling, detection and emptying operation of gas in the closed protective cover is achieved, it is ensured that even if SF6 electrical equipment leaks a trace amount of SF6, the SF6 gas can be rapidly captured, the risk that the SF6 leaks to the external environment is completely eliminated, and the safety of the SF6 electrical equipment is improved. And zero emission of SF6 gas is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety protection of electrical equipment, and in particular to a protection system for preventing SF6 electrical equipment from leaking. BACKGROUND

[0002] Sulfur hexafluoride (SF6) is widely used in high-voltage electrical equipment due to its excellent insulation performance. However, SF6 is also a very powerful greenhouse gas, and its potential impact on global warming far exceeds that of carbon dioxide. Therefore, preventing SF6 gas from leaking in SF6 electrical equipment is of great significance to environmental protection.

[0003] Currently, there are various technologies and devices on the market aimed at reducing SF6 gas leakage, but they can usually only reduce the risk of SF6 gas leakage, not completely eliminate it. CONTENT OF THE UTILITY MODEL

[0004] The utility model embodiment provides a protection system for preventing SF6 electrical equipment from leaking, to solve the problem that the prior art can only reduce the risk of SF6 gas leakage, not completely eliminate it.

[0005] The utility model embodiment provides a protection system for preventing SF6 electrical equipment from leaking, which comprises:

[0006] A closed protective cover is installed outside the SF6 electrical equipment to form a closed space for preventing SF6 gas in the SF6 electrical equipment from leaking into the external environment;

[0007] A gas extraction device is used to periodically sample the gas in the closed protective cover through a sampling port provided on the closed protective cover;

[0008] A gas detection device is used to detect the sample gas obtained by the gas extraction device to obtain the concentration value of SF6 gas in the closed protective cover in a timely manner;

[0009] The gas extraction device is also used to empty all the gas in the closed protective cover through the sampling port when the concentration value of the SF6 gas exceeds a preset threshold value;

[0010] A gas storage device is connected to the pipeline of the gas extraction device and is used to store the gas discharged during the emptying operation of the gas extraction device;

[0011] A control device is connected to the gas extraction device and the gas detection device respectively and is used to control the gas extraction device and the gas detection device to automatically sample, detect and empty the gas in the closed protective cover.

[0012] Optionally, the gas extraction device comprises a first gas extraction device and a second gas extraction device.

[0013] The first gas extraction device is configured to periodically sample the gas in the closed protective cover.

[0014] The second gas extraction device is configured to empty all the gas in the closed protective cover when the concentration of SF6 gas exceeds the preset threshold.

[0015] The power of the second gas extraction device is greater than that of the first gas extraction device.

[0016] Optionally, the power of the gas extraction device is adjustable, so as to reduce the power when performing the sampling operation and increase the power when performing the emptying operation.

[0017] Optionally, the gas detection device is provided with a detection gas chamber.

[0018] The detection gas chamber is connected with the gas extraction device pipeline and is configured to collect the sample gas obtained by the gas extraction device for detection by the gas detection device.

[0019] Further, the system further comprises:

[0020] A gas separation device connected with the control device and the gas buffer device, and configured to separate the SF6 gas and other gas in the gas buffered by the gas buffer device according to the control of the control device.

[0021] A gas recovery device connected with the gas separation device pipeline and configured to recover the SF6 gas separated by the gas separation device.

[0022] Optionally, the gas separation device is further connected with the gas extraction device pipeline.

[0023] Correspondingly, the gas extraction device is further configured to discharge the other gas separated by the gas separation device back into the closed protective cover according to the control of the control device.

[0024] Optionally, the gas separation device comprises at least one stage of separation devices, and each stage of the separation devices is connected in series.

[0025] The primary separation device of the gas separation device is connected with the gas buffer device pipeline and is configured to primarily separate the SF6 gas and other gas in the gas buffered by the gas buffer device according to the control of the control device.

[0026] The last one of the two adjacent separation devices is used for re-separating the SF6 gas separated by the former one of the two adjacent separation devices according to the control of the control device, so as to improve the purity of the SF6 gas separated by the former one of the two adjacent separation devices.

[0027] Further, the system further comprises: an SF6 gas purity detection device;

[0028] The SF6 gas purity detection device is connected with the control device and each of the separation devices, and is used for detecting the purity of the SF6 gas separated by each of the separation devices according to the control of the control device.

[0029] Each of the separation devices is connected with the gas recovery device, and when the purity of the SF6 gas separated by each of the separation devices reaches a target purity value, the SF6 gas separated by each of the separation devices is recovered by the gas recovery device.

[0030] Optionally, the gas separation device comprises two separation devices, so as to obtain SF6 gas with a purity not less than 99.9% through twice gas separation, wherein the primary separation device adopts a hollow fiber membrane separation device, and the secondary separation device adopts a deep cooling or rectification device.

[0031] Optionally, the sampling port of the closed protective cover is arranged at the bottom of the closed protective cover.

[0032] The closed protective cover is arranged outside the SF6 electrical equipment to form a closed space, so as to prevent SF6 gas in the SF6 electrical equipment from leaking to the external environment. In addition, the gas extraction device, the gas detection device, the gas buffer device and the corresponding control device are provided, so as to realize automatic sampling, detection and emptying operation of the gas in the closed protective cover, and ensure that even if trace SF6 gas leaks from the SF6 electrical equipment, the SF6 gas can be quickly captured, so that the risk of SF6 leakage to the external environment is completely eliminated, and zero emission of SF6 gas is realized. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A structure schematic view of a protective system for preventing SF6 electrical equipment from leaking is provided for the embodiment of the utility model;

[0034] Figure 2 A structure schematic view of another protective system for preventing SF6 electrical equipment from leaking is provided for the embodiment of the utility model;

[0035] Figure 3 A structure example view of a protective system for preventing SF6 electrical equipment from leaking is provided for the embodiment of the utility model. DETAILED DESCRIPTION

[0036] The utility model will be described in further detail below in connection with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and are not limited to the utility model. In addition, the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. In addition, it should be noted that only the part related to the utility model is shown in the drawings for convenience of description, not all structures.

[0037] Figure 1 A structure diagram of a protection system for SF6 electrical equipment leakage prevention provided by the embodiment of the utility model. As shown in the figure, the system specifically includes: Figure 1

[0038] The closed protective cover 101 is installed outside the SF6 electrical equipment to form a closed space for preventing SF6 gas in the SF6 electrical equipment from leaking to the outside environment.

[0039] The gas extraction device 102 is used for periodic sampling of the gas in the closed protective cover 101 through the sampling port opened on the closed protective cover 101.

[0040] The gas detection device 103 is used for detecting the sample gas obtained by the gas extraction device 102 to obtain the concentration value of the SF6 gas in the closed protective cover 101 in time.

[0041] The gas extraction device 102 is also used for emptying all the gas in the closed protective cover 101 through the sampling port when the concentration value of the SF6 gas exceeds the preset threshold value.

[0042] The gas buffer device 104 is connected with the pipeline of the gas extraction device 102 and is used for buffering the gas discharged when the gas extraction device 102 performs the emptying operation.

[0043] The control device 105 is connected with the gas extraction device 102 and the gas detection device 103 respectively and is used for controlling the gas extraction device 102 and the gas detection device 103 to realize automatic sampling, detection and emptying operation of the gas in the closed protective cover 101.

[0044] Optionally, the closed protective cover 101 is made of high-pressure-resistant and corrosion-resistant material to ensure its stability and safety in high-pressure and corrosive environment.

[0045] Optionally, the gas extraction device 102 can be a fan, a gas pump or any other device or equipment with gas extraction function.

[0046] ​In an embodiment, the power of the gas extraction device 102 is adjustable, so as to reduce the power when performing the sampling operation and increase the power when performing the emptying operation.

[0047] In an embodiment, the gas extraction device 102 comprises a first gas extraction device and a second gas extraction device; the first gas extraction device is used to periodically sample the gas in the closed protective cover 101 through the sampling port; the second gas extraction device is used to empty all the gas in the closed protective cover 101 through the sampling port when the concentration value of the SF6 gas exceeds the preset threshold value; wherein the power of the second gas extraction device is greater than the power of the first gas extraction device.

[0048] It can be understood that, since the sampling is an operation performed for detecting whether the SF6 electrical equipment leaks SF6, and the required amount of sample gas is small, a large power is not required to achieve rapid detection. The emptying is an operation performed for quickly emptying the gas in the closed protective cover in the case that the SF6 electrical equipment leaks SF6, and the amount of gas to be extracted is large, so a large power is required to quickly complete the emptying operation. Therefore, by using a gas extraction device with adjustable power, or using multiple gas extraction devices with different powers, the power requirement under different working conditions can be met, so as to ensure the rationality and effectiveness of energy use.

[0049] Optionally, the gas detection device 103 comprises a high-sensitivity SF6 gas detector with a detection limit of ppb level, so as to ensure that even if the SF6 electrical equipment leaks a small amount of SF6, it can be quickly detected.

[0050] Optionally, the SF6 gas detector used is a high-sensitivity SF6 detector with digital display and / or sound alarm and / or light alarm functions.

[0051] Optionally, the size of the preset threshold value can be selectively set according to user needs.

[0052] It can be understood that, the smaller the preset threshold value is set, the higher the sensitivity required by the gas detection device 103 is.

[0053] Optionally, the gas detection device 103 is provided with a detection gas chamber connected with the pipeline of the gas extraction device 102, for collecting the sample gas obtained by the gas extraction device 102, so as to be detected by the gas detection device 103.

[0054] It can be understood that, by additionally providing a special detection gas chamber, a detection environment is provided for the detection operation, and SF6 gas leakage into the external environment can also be avoided.

[0055] Optionally, the gas storage device 104 can be a gas tank, a gas cylinder or any container that can seal SF6 gas.

[0056] Optionally, the control device 105 can be a Programmable Logic Controller (PLC), a Microcontroller Unit (MCU), a Digital Signal Processor (DSP) or any other type of processor. The control device 105 can be integrated in the front end, or deployed in the background or remotely. The control device 105 can be connected to the gas extraction device 102 and the gas detection device 103 through wired or wireless communication.

[0057] The utility model embodiment forms a closed space by installing the closed protective cover outside the SF6 electrical equipment, for preventing SF6 gas in the SF6 electrical equipment from leaking to the external environment. In addition, by providing the gas extraction device, the gas detection device, the gas storage device and the corresponding control device, automatic sampling, detection and emptying operation of the gas in the closed protective cover are realized, so that even if trace SF6 leakage occurs in the SF6 electrical equipment, SF6 gas can be quickly captured, thereby completely eliminating the risk of SF6 leakage to the external environment and realizing zero emission of SF6 gas.

[0058] Further, as an optimized embodiment of the embodiment, in an embodiment, the sampling port of the closed protective cover 101 is arranged at the bottom of the closed protective cover 101.

[0059] It can be understood that, since the density of SF6 gas at normal temperature and pressure is about five times the density of air, when SF6 leakage occurs in the SF6 electrical equipment, the leaked SF6 gas will naturally sink and accumulate at the bottom of the closed protective cover. Therefore, by arranging the sampling port at the bottom of the closed protective cover, the effectiveness of sampling can be ensured, thereby improving the accuracy of gas detection. In addition, even in the early stage of SF6 leakage, SF6 gas will first accumulate at the bottom due to its large density. Therefore, this design follows the natural law of gas flow and conforms to the rationality of system design, thereby ensuring the stability and reliability of the system and avoiding false positives or false negatives caused by uneven gas distribution.

[0060] Figure 2 is a structural schematic diagram of a protective system for SF6 electrical equipment according to another embodiment of the utility model, which is further optimized on the basis of the above-mentioned embodiment.

[0061] As Figure 2As shown, the protection system for SF6 electrical equipment leakage prevention provided by the embodiment comprises a closed protection cover 201, a gas extraction device 202, a gas detection device 203, a gas storage device 204, a control device 205, a gas separation device 206, and a gas recycling device 207.

[0062] The gas separation device 206 is connected with the control device 205 and the gas storage device 204, and is used to separate the SF6 gas and other gas in the gas stored by the gas storage device 204 according to the control of the control device 205.

[0063] The gas recycling device 207 is connected with the gas separation device 206 in a pipeline, and is used to recycle the SF6 gas separated by the gas separation device 206.

[0064] It can be understood that the protection system can be designed as a closed loop system, and the core target is to prevent SF6 gas from leaking to the external environment, to reduce the influence on the external environment as much as possible, and to realize the recycling of resources. Based on the above purpose, the gas separation device 206 and the gas recycling device 207 can be added to the system to separate the SF6 gas and other gas in the gas stored by the gas storage device 204, and to recycle the separated SF6 gas for the SF6 electrical equipment.

[0065] In an embodiment, the protection system can be further provided with a gas recharge device to recharge the SF6 gas recycled by the gas recycling device 207 to the SF6 electrical equipment.

[0066] In an embodiment, the gas separation device 206 is also connected with the gas extraction device 202 in a pipeline.

[0067] Correspondingly, the gas extraction device 202 is also used to discharge the other gas separated by the gas separation device 206 back into the closed protection cover 201 through the sampling port according to the control of the control device 205.

[0068] It can be understood that by discharging the other gas except the SF6 gas back into the closed protection cover, the system internal pressure can be maintained stable to ensure the normal operation of the SF6 electrical equipment, the total amount of gas in the closed protection cover can be maintained balanced to ensure the long-term stable operation of the SF6 electrical equipment, the gas can be recycled to reduce resource waste, and the external air can be prevented from entering to bring moisture and dust, so as to keep the system internal clean and dry.

[0069] Optionally, the gas separation device 206 comprises at least one stage of separation devices, and each stage of separation devices is connected in series; the primary separation device of the gas separation device 206 is connected with the gas storage device 204 in pipeline, and is used for performing primary separation on the SF6 gas and other gases in the gas stored in the gas storage device 204 according to the control of the control device 205; the last separation device in any two adjacent stages of separation devices is used for performing secondary separation on the SF6 gas separated by the previous stage of separation devices according to the control of the control device 205, so as to improve the purity of the SF6 gas separated by the previous stage of separation devices.

[0070] It can be understood that, the primary separation performed by only one stage of separation devices cannot necessarily guarantee that the separated SF6 gas can reach the target purity value for reusing the SF6 electrical equipment. In order to guarantee the purity of the SF6 gas separated by the gas separation device 206, the gas separation device 206 can be configured as a plurality of stages of separation devices, so as to gradually improve the purity of the separated SF6 gas through multiple separations, until the target purity value is reached.

[0071] For example, the gas separation device 206 comprises two stages of separation devices, so as to obtain SF6 gas with a purity of not less than 99.9% through two times of gas separation. The primary separation device adopts a hollow fiber membrane separation device, and the secondary separation device adopts a cryogenic or rectification device.

[0072] The hollow fiber membrane separation device is a gas separation equipment based on membrane separation technology. The mixed gas composed of SF6 and other gases enters the hollow fiber membrane assembly from one end of the device and flows inside the hollow fiber membrane. Due to the different solubility and diffusion rate of different gas molecules in the membrane material, the SF6 gas and other gases (such as nitrogen and oxygen) are separated. The SF6 gas is trapped on one side of the membrane due to its larger molecular weight and lower diffusion rate, while the other gases are discharged through the other side of the membrane. The primary separated SF6 gas enters the cryogenic or rectification device, and the other gases are discharged back into the closed protective cover. The hollow fiber membrane separation device has the following advantages: 1) high efficiency: it can effectively separate SF6 gas from the mixed gas with high separation efficiency; 2) environmental protection: it does not need to use chemical solvents, reducing the pollution to the environment; 3) continuity: it can be continuously operated, suitable for large-scale gas separation requirements; 4) economy: the operation cost is low, and the maintenance is simple. However, the purity of the SF6 gas separated by the hollow fiber membrane separation device is not high enough, and its main role is to reduce the burden of the subsequent rectification process and improve the overall separation efficiency.

[0073] The cryogenic or rectification device is a gas separation device based on the principle of low temperature or rectification. Since the preliminary separated SF6 gas does not reach the standard of purity and is still a mixed gas (mainly SF6 gas and air), the cryogenic or rectification device is used for low temperature cooling. At low temperature (usually between-50℃ to-100℃), the boiling point of SF6 gas is much higher than that of nitrogen and oxygen in air (the boiling point of SF6 gas is-63.8℃, while the boiling points of nitrogen and oxygen in air are-195.8℃ and-183℃ respectively), thus, SF6 gas is liquefied first, while other components in air remain gaseous. The liquefied SF6 liquid is separated by a rectification tower, and other components in air are discharged through the top of the tower (which can also be discharged back into the enclosed protective cover). The separated high purity SF6 liquid is collected and re-gasified by heating, thereby obtaining SF6 gas with a purity of not less than 99.9%. The cryogenic or rectification device has the following advantages: 1) high purity: SF6 gas with extremely high purity can be obtained, with a purity of more than 99.9%; 2) wide applicability: suitable for separation of various complex gas mixtures; 3) high reliability: mature technology, stable and reliable operation.

[0074] By combining the hollow fiber membrane separation device and the cryogenic or rectification device, efficient separation and recovery of SF6 gas can be achieved. Specifically, the hollow fiber membrane separation device first separates SF6 gas from the mixed gas; the cryogenic or rectification device further purifies the preliminary separated SF6 gas to obtain high purity SF6 gas; the separated high purity SF6 gas is collected and stored by a gas recovery device (such as a gas cylinder) for reuse of SF6 electrical equipment.

[0075] Further, the protection system further comprises: an SF6 gas purity detection device; the SF6 gas purity detection device is connected with the control device 205 and each separation device of the gas separation device 206 respectively, and is used for detecting the purity of the SF6 gas separated by each separation device of the gas separation device 206 according to the control of the control device 205; each separation device of the gas separation device 206 is connected with the gas recovery device 207 respectively, and for each separation device, when the purity of the SF6 gas separated by the each separation device reaches the target purity value, the SF6 gas separated by the each separation device is recovered by the gas recovery device 207.

[0076] Optionally, the SF6 gas purity detection device is an SF6 gas purity analyzer.

[0077] Optionally, each stage of the gas separation device 206 is connected with the gas extraction device 202 pipeline, and for each stage of the gas separation device, after the each stage of the gas separation device performs the separation operation, the other gas separated by the each stage of the gas separation device is discharged back into the closed protective cover 201 through the gas extraction device 202.

[0078] The embodiment of the utility model adds gas separation device and gas recovery device on the basis of the foregoing embodiment, so that not only the risk of SF6 leakage to the external environment can be completely eliminated, zero emission of SF6 gas is realized, but also effective separation of SF6 gas and other gas leaked into the closed protective cover of SF6 electrical equipment can be realized, effective recovery of SF6 gas can be realized, and then recycling of resources is realized, and resource waste is reduced.

[0079] Figure 3 A structure example diagram of a protective system for preventing SF6 electrical equipment from leaking is provided for the embodiment of the utility model. As shown in the figure, Figure 3 The protective system comprises a closed protective cover 301, a first fan 302, a second fan 303, an SF6 gas detector 304, a detection gas chamber 305, a gas buffer chamber 306, a hollow fiber membrane separation device 307, a deep cooling or rectification device 308, a gas cylinder 309 and a controller 310. Among them,

[0080] The closed protective cover 301 is installed outside the SF6 electrical equipment to form a closed space for preventing SF6 gas in the SF6 electrical equipment from leaking to the external environment. A sampling port is formed in the bottom of the closed protective cover 301.

[0081] The first fan 302 is connected with the closed protective cover 301, the detection gas chamber 305 and the controller 310 respectively, and is used for regularly sampling the gas in the closed protective cover 301 through the sampling port according to the control of the controller 310, and extracting the obtained sample gas into the detection gas chamber 305.

[0082] The SF6 gas detector 304 is connected with the controller 310, and is used for detecting the sample gas extracted into the detection gas chamber 305 by the first fan 302 according to the control of the controller 310, so as to obtain the concentration value of SF6 gas in the closed protective cover 301 in time.

[0083] The second fan 303 is connected with the controller 310, and is used for emptying all the gas in the closed protective cover 301 through the sampling port according to the control of the controller 310 when the concentration value of SF6 gas contained in the closed protective cover 301 exceeds the preset threshold value.

[0084] The gas buffer chamber 306 is connected with the pipeline of the second fan 303, and is used for buffering the gas discharged by the second fan 303 during the emptying operation. A first valve is arranged before the gas inlet end of the gas buffer chamber 306, and the opening of the first valve is controlled by the controller 310, so that the gas discharged by the second fan 303 enters the gas buffer chamber 306;

[0085] The hollow fiber membrane separation device 307 is connected with the pipeline of the gas buffer chamber 306, and is used for preliminarily separating the SF6 gas and other gases in the buffered gas in the gas buffer chamber 306. A second valve is arranged before the gas inlet end of the hollow fiber membrane separation device 307, and the opening of the second valve is controlled by the controller 310, so that the gas in the gas buffer chamber 306 enters the hollow fiber membrane separation device 307. The hollow fiber membrane separation device 307 is also connected with the pipeline of the second fan 303, and is used for discharging the other gases preliminarily separated by the hollow fiber membrane separation device 307 back to the closed protective cover 301 through the second fan 303. A fifth valve is arranged between the hollow fiber membrane separation device 307 and the second fan 303, and the opening of the fifth valve is controlled by the controller 310;

[0086] The cryogenic or rectification device 308 is connected with the pipeline of the hollow fiber membrane separation device 307, and is used for further purifying the SF6 gas preliminarily separated by the hollow fiber membrane separation device 307 to obtain SF6 gas with a purity of not less than 99.9%. A third valve is arranged before the gas inlet end of the cryogenic or rectification device 308, and the opening of the third valve is controlled by the controller 310, so that the SF6 gas preliminarily separated by the hollow fiber membrane separation device 307 enters the cryogenic or rectification device 308. The cryogenic or rectification device 308 is also connected with the pipeline of the second fan 303, and is used for discharging the other gases further purified and separated by the cryogenic or rectification device 308 back to the closed protective cover 301 through the second fan 303. A sixth valve is arranged between the cryogenic or rectification device 308 and the second fan 303, and the opening of the sixth valve is controlled by the controller 310;

[0087] The gas cylinder 309 is connected with the pipeline of the cryogenic or rectification device 308, and is used for recovering the high-purity SF6 gas obtained by the further purification of the cryogenic or rectification device 308. A fourth valve is arranged before the gas inlet end of the gas cylinder 309, and the opening of the fourth valve is controlled by the controller 310, so that the high-purity SF6 gas obtained by the further purification of the cryogenic or rectification device 308 enters the gas cylinder 309;

[0088] The controller 310 is connected with the first fan 302, the second fan 303, the SF6 gas detector 304, the first valve, the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve respectively, and is used for controlling the first fan 302, the second fan 303, the SF6 gas detector 304, the hollow fiber membrane separation device 307, the cryogenic or rectification device 308 and the gas cylinder 309, so as to realize automatic sampling, detection, emptying, separation and recovery operations on the gas in the closed protective cover 301.

[0089] The first valve M1, the second valve M2, the third valve M3, the fourth valve M4, the fifth valve M5 and the sixth valve M6 are electric valves.

[0090] It should be noted that, corresponding to the first fan 302 and the second fan 303, an exhaust port can be arranged at the bottom of the closed protective cover 301 respectively, wherein the exhaust port corresponding to the first fan 302 is used as a sampling port, and the exhaust ports corresponding to the first fan 302 and the second fan 303 can also share one exhaust port. Figure 3 Taking the case that the exhaust ports share one exhaust port as an example.

[0091] It should be noted that, corresponding to the first fan 302 and the second fan 303, an exhaust port can be arranged at the bottom of the closed protective cover 301 respectively, wherein the exhaust port corresponding to the first fan 302 is used as a sampling port, and the exhaust ports corresponding to the first fan 302 and the second fan 303 can also share one exhaust port. Figure 3 Taking the case that the exhaust ports share one exhaust port as an example.

[0091] It should be noted that, corresponding to the first fan 302 and the second fan 303, an exhaust port can be arranged at the bottom of the closed protective cover 301 respectively, wherein the exhaust port corresponding to the first fan 302 is used as a sampling port, and the exhaust ports corresponding to the first fan 302 and the second fan 303 can also share one exhaust port. Figure 3 Taking the case that the exhaust ports share one exhaust port as an example.

[0091] It should be noted that, corresponding to the first fan 302 and the second fan 303, an exhaust port can be arranged at the bottom of the closed protective cover 301 respectively, wherein the exhaust port corresponding to the first fan 302 is used as a sampling port, and the exhaust ports corresponding to the first fan 302 and the second fan 303 can also share one exhaust port. Figure 3 Taking the case that the exhaust ports share one exhaust port as an example.

[0091] It should be noted that, corresponding to the first fan 302 and the second fan 303, an exhaust port can be arranged at the bottom of the closed protective cover 301 respectively, wherein the exhaust port corresponding to the first fan 302 is used as a sampling port, and the exhaust ports corresponding to the first fan 302 and the second fan 303 can also share one exhaust port. Figure 3 Taking the case that the exhaust ports share one exhaust port as an example.

[0091] It should be noted that, corresponding to the first fan 302 and the second fan 303, an exhaust port can be arranged at the bottom of the closed protective cover 301 respectively, wherein the exhaust port corresponding to the first fan 302 is used as a sampling port, and the exhaust ports corresponding to the first fan 302 and the second fan 303 can also share one exhaust port. Figure 3 Taking the case that the exhaust ports share one exhaust port as an example.

[0091] It should be noted that, corresponding to the first fan 302 and the second

Claims

1. A protection system for preventing leakage of SF6 electrical equipment, characterized in that, The utility model relates to a kind of SF6 gas leakage detection and prevention device for SF6 electrical equipment, comprising: Airtight protective cover is installed outside SF6 electrical equipment to form airtight space for preventing SF6 gas in SF6 electrical equipment from leaking to outside environment; Gas extraction device is used to periodically sample gas in airtight protective cover through sampling port on airtight protective cover; Gas detection device is used to detect sample gas obtained by gas extraction device to obtain concentration value of SF6 gas in airtight protective cover in time; When concentration value of SF6 gas exceeds preset threshold value, gas extraction device is also used to empty all gas in airtight protective cover through sampling port; Gas storage device is connected with gas extraction device pipeline to store gas discharged by gas extraction device during emptying operation; Control device is connected with gas extraction device and gas detection device respectively to control gas extraction device and gas detection device to realize automatic sampling, detection and emptying operation of gas in airtight protective cover.

2. The protection system for SF6 electrical equipment against leakage according to claim 1, characterized in that, Power of gas extraction device can be adjusted to reduce power during sampling operation and increase power during emptying operation.

3. The protection system for SF6 electrical equipment against leakage according to claim 1, characterized in that, Gas extraction device includes first gas extraction device and second gas extraction device; First gas extraction device is used to periodically sample gas in airtight protective cover through sampling port; Second gas extraction device is used to empty all gas in airtight protective cover through sampling port when concentration value of SF6 gas exceeds preset threshold value; Wherein, power of second gas extraction device is greater than power of first gas extraction device.

4. The protection system for SF6 electrical equipment against leakage according to claim 1, characterized in that, Gas detection device is provided with detection gas chamber; Detection gas chamber is connected with gas extraction device pipeline to collect sample gas obtained by gas extraction device for detection by gas detection device.

5. The protection system for SF6 electrical equipment against leakage according to claim 1, characterized in that, Further comprising: Gas separation device is connected with control device and gas storage device respectively to separate SF6 gas and other gas in gas stored by gas storage device according to control of control device; Gas recovery device is connected with gas separation device pipeline to recover SF6 gas separated by gas separation device.

6. The protection system for SF6 electrical equipment against leakage according to claim 5, characterized in that, Gas separation device is also connected with gas extraction device pipeline; Correspondingly, gas extraction device is also used to discharge other gas separated by gas separation device back into airtight protective cover through sampling port according to control of control device.

7. The protection system for SF6 electrical equipment against leakage according to claim 5, characterized in that, Gas separation device includes at least one separation device, and each separation device is connected in series. Primary separation device of gas separation device is connected with gas storage device pipeline to primarily separate SF6 gas and other gas in gas stored by gas storage device according to control of control device. The last separation device of any two adjacent stages of the separation devices is used to separate the SF6 gas separated by the previous separation device again according to the control of the control device, so as to improve the purity of the SF6 gas separated by the previous separation device.

8. The protection system for SF6 electrical equipment against leakage according to claim 7, characterized in that, Further comprising: an SF6 gas purity detection device; The SF6 gas purity detection device is connected with the control device and each stage of the separation devices respectively, and is used to detect the purity of the SF6 gas separated by each stage of the separation devices according to the control of the control device; Each stage of the separation devices is connected with the gas recovery device respectively, and when the purity of the SF6 gas separated by each stage of the separation devices reaches a target purity value, the SF6 gas separated by each stage of the separation devices is recovered through the gas recovery device.

9. The protection system for SF6 electrical equipment against leakage according to claim 7, characterized in that, The gas separation device comprises two stages of separation devices to obtain SF6 gas with a purity not less than 99.9% through twice gas separation, wherein a hollow fiber membrane separation device is used as a primary separation device, and a deep cooling or rectification device is used as a secondary separation device.

10. The protection system against leaks of SF6 electrical equipment according to any of claims 1 to 9, characterized in that, The sampling port of the closed protective cover is arranged at the bottom of the closed protective cover.

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