SF6 gas monitoring alarm device
By installing a monitoring box and detection chamber on the high-voltage distribution cabinet, combined with a vacuum pump and PLC controller, real-time monitoring and accurate detection of SF6 gas concentration are achieved. This solves the problems of insufficient accuracy and uncontrollable gas flow in traditional monitoring methods, ensuring the stability of SF6 gas in the equipment and the accuracy of detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING HUADIAN YUNTONG POWER TECH CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-22
AI Technical Summary
Traditional SF6 gas monitoring methods have low detection accuracy and uncontrollable gas flow direction, making it impossible to detect SF6 gas leaks in equipment in a timely manner.
An SF6 gas monitoring and alarm device was designed, including a monitoring box, a detection chamber, a sedimentation and reflux chamber, an SF6 gas tank, and a PLC controller. The device uses a vacuum pump to extract gas from inside the high-voltage distribution cabinet, a sulfur hexafluoride sensor to detect the concentration, and is equipped with a pipeline cleaning component to ensure detection accuracy and precision.
It enables real-time monitoring and accurate detection of SF6 gas concentration, prevents gas leakage, ensures stable SF6 gas content within the equipment, and provides timely replenishment and cleaning mechanisms to ensure a clean environment inside the testing chamber.
Smart Images
Figure CN224266938U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of SF6 gas monitoring technology, and more specifically, to an SF6 gas monitoring and alarm device. Background Technology
[0002] SF6 (sulfur hexafluoride) gas was synthesized by French chemists Moissan and Lebeau in 1900. Due to its unique properties, it has been widely used in many fields, especially in the power industry. SF6 is renowned for its excellent insulation and arc-extinguishing properties, making it a key material in high-voltage switchgear and substations. It not only effectively isolates electrodes, preventing arcing and electric shock, but also rapidly dissipates heat from electric arcs through its high thermal conductivity, protecting electrical equipment from damage.
[0003] In the power sector, SF6 gas is widely used in high-voltage equipment. However, due to factors such as equipment manufacturing processes, assembly processes, aging processes, temperature changes, and pressure differences, SF6 gas leakage problems occur frequently. The traditional monitoring method involves setting up an SF6 gas detection device in the center of the high-voltage equipment area to detect whether there is a gas leak. Once SF6 gas is detected, the device will issue an audible and visual alarm to notify maintenance personnel to carry out maintenance. However, this method is not accurate enough, and the flow direction of SF6 gas is uncontrollable. Often, the detection device's probe can only detect it after the gas has already filled the high-voltage equipment area. Utility Model Content
[0004] To overcome the above deficiencies, this utility model provides an SF6 gas monitoring and alarm device to solve the aforementioned problems.
[0005] This utility model is implemented as follows:
[0006] An SF6 gas monitoring and alarm device includes a high-voltage distribution cabinet, a monitoring box on the top of the high-voltage distribution cabinet, a detection chamber on the inner side of the monitoring box near the top, the detection chamber being connected to the high-voltage distribution cabinet for extracting gas from inside the high-voltage distribution cabinet, a ventilation port on one side of the monitoring box, a vacuum pump at the ventilation port for evacuating the detection chamber, a sedimentation reflux chamber below the detection chamber and connected to it, the bottom of the sedimentation reflux chamber being connected to the high-voltage distribution cabinet, an SF6 gas tank on one side inside the monitoring box and connected to the top of the sedimentation reflux chamber, a first pressure gauge on the bottom wall of the monitoring box connected to the high-voltage distribution cabinet, a PLC controller inside the monitoring box, an alarm on the top of the monitoring box, and the PLC controller being communicatively connected to the alarm, the detection chamber, the vacuum pump, the first pressure gauge, and the sedimentation reflux chamber.
[0007] In an embodiment of this utility model, a first pipe connected to the high-voltage distribution cabinet is provided on the side of the detection chamber near the top. A first solenoid valve is provided on the first pipe. A partitioned mounting area is provided inside the monitoring box near the ventilation port. The vacuum pump is mounted on the mounting area. A second pipe is connected between the input pipe of the vacuum pump and the detection chamber. The second pipe merges with the first pipe near its end. A second solenoid valve is provided on the second pipe.
[0008] In an embodiment of this utility model, the top side of the detection chamber has a recessed platform, a second pressure gauge for detecting the internal pressure of the detection chamber is provided on the platform, and a sulfur hexafluoride sensor is provided inside the detection chamber.
[0009] In an embodiment of this utility model, a third pipe is connected between the bottom of the detection chamber and the top of the sedimentation reflux chamber, and a third solenoid valve is installed on the third pipe. A fourth pipe is connected between the bottom of the sedimentation reflux chamber and the high-voltage distribution cabinet, and a fourth solenoid valve is installed on the fourth pipe. A fifth solenoid valve is installed at the outlet of the SF6 gas tank, and the other end of the fifth solenoid valve is connected to the top of the sedimentation reflux chamber via a fifth pipe.
[0010] In an embodiment of this utility model, the signal input terminal of the PLC controller is communicatively connected to the signal output terminals of the first pressure gauge, the second pressure gauge, and the sulfur hexafluoride sensor, respectively, and the signal output terminal of the controller is communicatively connected to the signal input terminals of the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the vacuum pump, and the alarm, respectively.
[0011] In an embodiment of this utility model, both the detection chamber and the sedimentation reflux chamber have a downwardly sloping bottom.
[0012] In an embodiment of this utility model, a material door is provided on the outer side of the monitoring box away from the ventilation port. The inner side of the material door is separated into a material compartment and a control compartment by a partition. The SF6 gas tank is placed in the material compartment, and the PLC controller is located in the control compartment.
[0013] In an embodiment of this utility model, the monitoring box is further provided with a pipeline cleaning assembly. The pipeline cleaning assembly includes a cleaning gas tank located inside the material compartment. A sixth solenoid valve is provided at the outlet of the cleaning gas tank. The other end of the sixth solenoid valve is connected to a sixth pipeline near the bottom of the detection compartment. A seventh pipeline is provided near the top of the detection compartment. The other end of the seventh pipeline extends to the air exchange port. A seventh solenoid valve is provided on the seventh pipeline.
[0014] In an embodiment of this utility model, the signal output terminal of the PLC controller is communicatively connected to the signal input terminals of the sixth solenoid valve and the seventh solenoid valve, respectively.
[0015] In an embodiment of this utility model, a filter screen is provided at the air exchange port.
[0016] The beneficial effects of this utility model are as follows: By setting up a monitoring box on the high-voltage power distribution equipment, the concentration of SF6 gas inside the equipment is sampled and detected at regular intervals. To ensure the stability of the gas content, a reflux operation is designed so that the extracted SF6 gas is replenished in a timely manner, preventing the gas from decreasing due to prolonged use. At the same time, a pipeline cleaning component is provided, which uses helium released from the cleaning gas tank to clean the detection chamber. Helium has a stable structure, does not react with SF6 gas, and has a low density, so it will not affect subsequent gas detection. The cleaned helium flows smoothly to the gas exchange port through the seventh pipeline, ensuring that the environment inside the detection chamber is always clean and accurate, providing a strong guarantee for the monitoring of SF6 gas concentration. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 A schematic diagram of the structure of an SF6 gas monitoring and alarm device provided for an embodiment of this utility model;
[0019] Figure 2 A cross-sectional structural schematic diagram of an SF6 gas monitoring and alarm device provided for an embodiment of this utility model;
[0020] Figure 3 A communication block diagram provided for embodiments of this utility model.
[0021] In the diagram: 10. High-voltage distribution cabinet; 20. Monitoring box; 21. Ventilation port; 22. Filter screen; 23. First pressure gauge; 24. Material door; 30. Detection chamber; 31. First pipeline; 32. First solenoid valve; 33. Second pressure gauge; 34. Sulfur hexafluoride sensor; 40. Vacuum pump; 41. Second pipeline; 42. Second solenoid valve; 50. Sedimentation reflux chamber; 51. Third pipeline; 52. Third solenoid valve; 53. Fourth pipeline; 54. Fourth solenoid valve; 55. SF6 gas tank; 56. Fifth pipeline; 57. Fifth solenoid valve; 60. PLC controller; 70. Alarm; 80. Pipeline cleaning assembly; 81. Cleaning gas tank; 82. Sixth solenoid valve; 83. Sixth pipeline; 84. Seventh pipeline; 85. Seventh solenoid valve. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0024] like Figure 1-3As shown, this utility model provides an SF6 gas monitoring and alarm device, including a high-voltage distribution cabinet 10. A monitoring box 20 is mounted on the top of the high-voltage distribution cabinet 10. A detection chamber 30 is located on the inner side of the monitoring box 20 near the top, and the detection chamber 30 is connected to the high-voltage distribution cabinet 10 for extracting gas from inside the cabinet. A ventilation port 21 is provided on one side of the monitoring box 20, and a vacuum pump 40 is installed at the ventilation port 21 to evacuate the detection chamber 30. A sedimentation reflux chamber 50 is located below the detection chamber 30 and is connected to it. The bottom of the sedimentation reflux chamber 50 is connected to the high-voltage distribution cabinet 10. An SF6 gas tank 55 is located on one side inside the monitoring box 20 and is connected to the top of the sedimentation reflux chamber 50. A first pressure gauge 23 connected to the high-voltage distribution cabinet 10 is installed on the bottom wall of the monitoring box 20. A PLC controller 60 is also installed inside the monitoring box 20, and an alarm 70 is installed on the top of the monitoring box 20. The PLC controller 60 is connected to the alarm 70, the detection chamber 30, the vacuum pump 40, the first pressure gauge 23, and the sedimentation reflux chamber 50. By setting up a monitoring box 20 on any high-voltage distribution cabinet 10, the concentration of SF6 gas in the upper layer inside can be detected in real time, thereby determining whether the SF6 gas inside has decreased due to leakage. Then, the alarm 70 will issue an audible and visual alarm to notify the nearby maintenance personnel. This method of equipping each device with a monitoring box 20 can more accurately detect SF6 gas leakage problems and avoid the problem of inaccurate detection due to excessive SF6 leakage.
[0025] In this embodiment, a first pipe 31 connected to the high-voltage distribution cabinet 10 is provided on the side of the detection chamber 30 near the top. A first solenoid valve 32 is provided on the first pipe 31. A partition splicing area is provided inside the monitoring box 20 near the air exchange port 21. A vacuum pump 40 is provided on the mounting area. A second pipe 41 is connected between the input pipe of the vacuum pump 40 and the detection chamber 30. The second pipe 41 merges with the first pipe 31 near the end. A second solenoid valve 42 is provided on the second pipe 41.
[0026] It should be noted that the height of the first pipe 31 inside the high-voltage distribution cabinet 10 is preferably 10cm from the top. Since SF6 gas has a high density, which is 5 times that of air at normal temperature and pressure, if there is a leak of SF6 gas in the high-voltage distribution cabinet 10, the air mixed in from the outside or the methane, acetylene and other gases produced by factors such as aging of electrical equipment and high temperature will be located in the upper area inside the high-voltage distribution cabinet 10. Therefore, the first pipe 31 is set at this location to facilitate the collection of effective sample gas for detection.
[0027] In this embodiment, the top side of the detection chamber 30 has a sunken platform, on which a second pressure gauge 33 is installed for detecting the internal pressure of the detection chamber 30. A sulfur hexafluoride sensor 34 is installed inside the detection chamber 30 to detect the gas concentration data of sulfur hexafluoride in the gas sample collected inside the detection chamber 30.
[0028] In Example 1, when collecting sample gas inside the high-voltage distribution cabinet 10, the second solenoid valve 42 is opened by the PLC controller 60 (it should be noted that all solenoid valves are closed by default). At the same time, the vacuum pump 40 is turned on to evacuate the detection chamber 30. When the second pressure gauge 33 detects that the pressure inside the detection chamber 30 reaches the threshold, it sends a signal to the PLC controller 60, which then closes the second solenoid valve 42 and the vacuum pump 40. At this time, the first solenoid valve 32 is opened, and the detection chamber 30 is connected to the high-voltage distribution cabinet 10. The upper gas of the high-voltage distribution cabinet 10 is extracted from the detection chamber 30 by negative pressure. When the values of the first pressure gauge 23 and the second pressure gauge 33 are equal, the first solenoid valve 32 is closed.
[0029] It should be noted that the initial pressure value detected by the first pressure gauge 23 in the high-voltage distribution cabinet 10 is the initial reference value. After the sampling and testing are completed, when returning SF6 gas to the high-voltage distribution cabinet 10, it is necessary to ensure that the pressure value in the high-voltage distribution cabinet 10 is the initial reference value.
[0030] In this embodiment, a third pipe 51 is connected between the bottom of the detection chamber 30 and the top of the sedimentation reflux chamber 50. A third solenoid valve 52 is installed on the third pipe 51. A fourth pipe 53 is connected between the bottom of the sedimentation reflux chamber 50 and the high-voltage distribution cabinet 10. A fourth solenoid valve 54 is installed on the fourth pipe 53. A fifth solenoid valve 57 is installed at the outlet of the SF6 gas tank 55. The other end of the fifth solenoid valve 57 is connected to the top of the sedimentation reflux chamber 50 via a fifth pipe 56.
[0031] In this embodiment, both the detection chamber 30 and the sedimentation reflux chamber 50 are provided with downward sloping bottoms. When the third pipe 51 is connected, due to the high density characteristics of SF6 gas, the downward sloping bottom design facilitates the downward flow of SF6.
[0032] In this embodiment, the signal input terminal of the PLC controller 60 is communicatively connected to the signal output terminals of the first pressure gauge 23, the second pressure gauge 33, and the sulfur hexafluoride sensor 34, respectively. The signal output terminal of the controller is communicatively connected to the signal input terminals of the first solenoid valve 32, the second solenoid valve 42, the third solenoid valve 52, the fourth solenoid valve 54, the fifth solenoid valve 57, the vacuum pump 40, and the alarm 70, respectively.
[0033] In this embodiment, a material door 24 is provided on the outer side of the monitoring box 20 away from the ventilation port 21. The inner side of the material door 24 is separated into a material compartment and a control compartment by a partition. The SF6 gas tank 55 is placed in the material compartment, and the PLC controller 60 is placed in the control compartment. The design of the material compartment and the material door 24 facilitates the replacement of the SF6 gas tank 55.
[0034] In this embodiment, the monitoring box 20 is also equipped with a pipeline cleaning component 80. The pipeline cleaning component 80 includes a cleaning air tank 81 installed inside the material compartment. A sixth solenoid valve 82 is installed at the air outlet of the cleaning air tank 81. The other end of the sixth solenoid valve 82 is connected to a sixth pipeline 83 near the bottom of the detection compartment 30. A seventh pipeline 84 is installed near the top of the detection compartment 30. The other end of the seventh pipeline 84 extends to the air exchange port 21. A seventh solenoid valve 85 is installed on the seventh pipeline 84.
[0035] The signal output terminals of the PLC controller 60 are connected to the signal input terminals of the sixth solenoid valve 82 and the seventh solenoid valve 85, respectively.
[0036] In Example 2, after the PLC sensor acquires the data collected by the sulfur hexafluoride sensor 34, the flow direction of the SF6 gas is selected according to the concentration of SF6 gas in the sample gas. Specifically, when the concentration of SF6 gas in the sample gas reaches 50% or more, the third solenoid valve 52 is opened and kept open for 5-10 minutes. After the gas in the detection chamber 30 flows into the sedimentation return chamber 50, the third solenoid valve 52 is closed, and then the fourth solenoid valve 54 is opened and kept open for 5-10 minutes, so that the SF6 gas in the sedimentation return chamber 50 flows into the interior of the high-voltage distribution cabinet 10. At this time, the pressure value in the high-voltage distribution cabinet 10 cannot be restored to the initial reference value, so the fifth solenoid valve 57 is opened to replenish SF6 gas through the SF6 gas tank 55, thereby restoring the pressure value in the high-voltage distribution cabinet 10 to the initial reference value. At this time, after the PLC controller 60 obtains the value of the first pressure gauge 23 as the initial reference value, it closes the fifth solenoid valve 57. After waiting for another 5-10 minutes, the fourth solenoid valve 54 can be closed.
[0037] Example 3: When the concentration of SF6 gas in the sample gas is less than 50%, the control alarm 70 will issue an audible and visual alarm to notify the nearby duty room.
[0038] Example 4: After Example 2 and Example 3 are completed, the sixth solenoid valve 82 and the seventh solenoid valve 85 are opened by the PLC controller 60. Cleaning gas is sprayed out of the cleaning gas tank 81 to clean the inside of the detection chamber 30. The cleaning gas flows from the seventh pipe 84 to the air exchange port 21. After cleaning is completed, the sixth solenoid valve 82 and the seventh solenoid valve 85 can be closed.
[0039] In this embodiment, the gas filled in the cleaning gas tank 81 is preferably helium, which has a stable structure, does not react with SF6 gas, and has a low density, so it does not interfere with subsequent detection.
[0040] In this embodiment, a filter screen 22 is provided at the air exchange port 21 to prevent dust and impurities from being carried in by gas backflow during the use of the seventh pipe 84 and the vacuum pump 40.
[0041] It should be noted that the detection of this device requires the setting of a timing program to perform interval sampling detection. The timing program is a common technology in the industry, so it will not be described in detail here.
[0042] It should be noted that the specific models and specifications of the pressure gauge, solenoid valve, sulfur hexafluoride sensor 34, vacuum pump 40, alarm 70 and PLC controller 60 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.
[0043] The power supply and operating principles of the pressure gauge, solenoid valve, sulfur hexafluoride sensor 34, vacuum pump 40, alarm 70, and PLC controller 60 are clear to those skilled in the art and will not be described in detail here.
[0044] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.
Claims
1. An SF6 gas monitoring and alarm device, comprising a high-voltage distribution cabinet (10), characterized in that, The high-voltage distribution cabinet (10) is equipped with a monitoring box (20) on its top. A detection chamber (30) is located on the inner side of the monitoring box (20) near the top. The detection chamber (30) is connected to the high-voltage distribution cabinet (10) and is used to extract gas from inside the high-voltage distribution cabinet (10). A ventilation port (21) is provided on one side of the monitoring box (20), and a vacuum pump (40) is installed at the ventilation port (21). The vacuum pump (40) is used to evacuate the detection chamber (30). A sedimentation reflux chamber (50) is located below the detection chamber (30) and is connected to it. The bottom of the sedimentation reflux chamber (50) is connected to the high-voltage distribution cabinet (10). 0) Connected, an SF6 gas tank (55) is provided on one side inside the monitoring box (20), the SF6 gas tank (55) is connected to the top of the sedimentation reflux chamber (50), a first pressure gauge (23) connected to the high voltage distribution cabinet (10) is provided on the bottom wall of the monitoring box (20), a PLC controller (60) is also provided inside the monitoring box (20), an alarm (70) is provided on the top of the monitoring box (20), and the PLC controller (60) is connected to the alarm (70), the detection chamber (30), the vacuum pump (40), the first pressure gauge (23) and the sedimentation reflux chamber (50) respectively.
2. The SF6 gas monitoring and alarm device according to claim 1, characterized in that, The detection chamber (30) has a first pipe (31) connected to the high-voltage distribution cabinet (10) near the top side. A first solenoid valve (32) is installed on the first pipe (31). The monitoring box (20) has a partition splicing area near the air exchange port (21). The vacuum pump (40) is installed on the installation area. The input pipe of the vacuum pump (40) is connected to the detection chamber (30) by a second pipe (41). The second pipe (41) merges with the first pipe (31) near the end side. A second solenoid valve (42) is installed on the second pipe (41).
3. The SF6 gas monitoring and alarm device according to claim 2, characterized in that, The top side of the detection chamber (30) has a recessed platform, on which a second pressure gauge (33) for detecting the internal pressure of the detection chamber (30) is provided, and a sulfur hexafluoride sensor (34) is provided inside the detection chamber (30).
4. The SF6 gas monitoring and alarm device according to claim 3, characterized in that, A third pipe (51) is connected between the bottom of the detection chamber (30) and the top of the sedimentation reflux chamber (50). A third solenoid valve (52) is installed on the third pipe (51). A fourth pipe (53) is connected between the bottom of the sedimentation reflux chamber (50) and the high-voltage distribution cabinet (10). A fourth solenoid valve (54) is installed on the fourth pipe (53). A fifth solenoid valve (57) is installed at the outlet of the SF6 gas tank (55). The other end of the fifth solenoid valve (57) is connected to the top of the sedimentation reflux chamber (50) via a fifth pipe (56).
5. An SF6 gas monitoring and alarm device according to claim 4, characterized in that, The signal input terminal of the PLC controller (60) is connected to the signal output terminals of the first pressure gauge (23), the second pressure gauge (33) and the sulfur hexafluoride sensor (34), respectively. The signal output terminal of the controller is connected to the signal input terminals of the first solenoid valve (32), the second solenoid valve (42), the third solenoid valve (52), the fourth solenoid valve (54), the fifth solenoid valve (57), the vacuum pump (40) and the alarm (70), respectively.
6. An SF6 gas monitoring and alarm device according to claim 4, characterized in that, Both the detection chamber (30) and the sedimentation reflux chamber (50) have a downwardly sloping bottom.
7. The SF6 gas monitoring and alarm device according to claim 1, characterized in that, A material door (24) is provided on the outer side of the monitoring box (20) away from the ventilation port (21). The inner side of the material door (24) is separated into a material compartment and a control compartment by a partition. The SF6 gas tank (55) is placed in the material compartment, and the PLC controller (60) is located in the control compartment.
8. An SF6 gas monitoring and alarm device according to claim 7, characterized in that, The monitoring box (20) is also equipped with a pipeline cleaning assembly (80). The pipeline cleaning assembly (80) includes a cleaning gas tank (81) installed inside the material compartment. A sixth solenoid valve (82) is installed at the outlet of the cleaning gas tank (81). The other end of the sixth solenoid valve (82) is connected to a sixth pipeline (83) near the bottom of the detection compartment (30). A seventh pipeline (84) is installed near the top of the detection compartment (30). The other end of the seventh pipeline (84) extends to the air exchange port (21). A seventh solenoid valve (85) is installed on the seventh pipeline (84).
9. An SF6 gas monitoring and alarm device according to claim 8, characterized in that, The signal output terminal of the PLC controller (60) is communicatively connected to the signal input terminals of the sixth solenoid valve (82) and the seventh solenoid valve (85), respectively.
10. An SF6 gas monitoring and alarm device according to claim 9, characterized in that, A filter screen (22) is provided at the air exchange port (21).