A device for automatically recovering and filling insulation gas of GIS equipment

Abstract

The application discloses a kind of for GIS equipment insulation gas automatic recovery and filling device, including equipment base, gas storage module, processing module, control module and connecting pipeline;Equipment base provides mounting base for device;Gas storage module includes SF6 gas recovery storage container and environmental protection insulation gas storage container, both are equipped with ultrasonic level meter and temperature sensor respectively;Processing module includes compressor unit, vacuum unit, drying filter regenerator, heat exchanger and valve group, and compressor unit is connected with vacuum unit by pipeline;Control module includes the electric control cabinet of integrated PLC measurement and control system, and vacuum gauge controller, SF6 gas concentration detection module, trace moisture tester and multiple sensors connected with electric control cabinet, the present application solves the problems of existing conventional SF6 gas recovery and filling equipment, such as complicated operation, low efficiency, poor safety, etc., improves work efficiency, reduces the risk of manual intervention, and also supports the adaptation of environmental protection insulation gas.

Description

Technical Field

[0001] This invention relates to the field of GIS equipment technology, and more specifically, to an automatic recovery and refilling device for insulating gas in GIS equipment. Background Technology

[0002] Gas-insulated equipment is a core component of power systems. Currently, the power industry primarily uses SF6 gas as an insulation and arc-quenching medium. However, SF6's global warming potential (GWP) is 24,300 times that of CO2, and its atmospheric lifetime is as long as 3,200 years. Optimizing insulating gas recovery and precise refueling equipment, improving gas management efficiency and environmental performance, and gradually phasing out SF6 gas will help establish an environmentally friendly and efficient green power grid, contributing to solving the international environmental challenge of global warming.

[0003] Currently, at project construction sites, the recovery and refilling of insulating gas in GIS equipment still largely relies on traditional sulfur hexafluoride (SF6) gas recovery and refilling devices. This is especially true for GIS equipment undergoing power outages for maintenance after operation. Operators must pay close attention to their personal protection and the airtightness and reliability of the insulating gas recovery and refilling devices. The arc decomposition products of SF6 gas mainly generate various low-fluorine sulfides. If trace amounts of impurities such as H2O and O2 are also present inside the SF6 gas insulation equipment, the decomposition products will further react with these impurities, generating components such as SO2F2, SOF2, SO2, HF, and H2S. These decomposition gases have varying degrees of toxicity, posing safety hazards to personnel and the environment. Traditional SF6 gas recovery and filling devices have a single operation mode, are only applicable to a single gas, have cumbersome procedures, low efficiency, no storage design for the recovered gas or insufficient storage capacity, lack automation functions and have low safety. They require manual operation to open and close the corresponding valves and units, which is relatively cumbersome, prone to misoperation, and the operation procedures and construction progress cannot be guaranteed. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide an automatic recovery and filling device for insulating gas in GIS equipment, which solves the problems of cumbersome operation, low efficiency, and poor safety of existing traditional SF6 gas recovery and filling equipment, improves work efficiency, reduces the risk of manual intervention, and also supports the adaptation of environmentally friendly insulating gases.

[0005] The present invention adopts the following technical solution:

[0006] An automatic recovery and refilling device for insulating gas in GIS equipment includes an equipment base, a gas storage module, a processing module, a control module, and connecting pipelines.

[0007] The equipment base provides a mounting base for the device;

[0008] The gas storage module includes an SF6 gas recovery storage container and an environmentally friendly insulating gas storage container, which are set up independently and are equipped with an ultrasonic level gauge and a temperature sensor respectively.

[0009] The processing module includes a compressor unit, a vacuum unit, a dryer-filter-regenerator, a heat exchanger, and a valve group. The compressor unit and the vacuum unit are connected by pipelines for gas recovery and power output. The dryer-filter-regenerator is used for gas purification, and the heat exchanger realizes gas state conversion.

[0010] The control module includes an electrical control cabinet with an integrated PLC measurement and control system, and a vacuum gauge controller, an SF6 gas concentration detection module, a trace moisture analyzer, and multiple sensors connected to the electrical control cabinet. The sensors are used to collect parameters such as temperature, pressure, liquid level, and vacuum degree.

[0011] The connecting pipeline adopts a sealed structure, and the gas flow direction is controlled by a valve group to realize the automatic recovery, purification, storage and filling of insulating gas for GIS equipment.

[0012] Furthermore, the valve assembly includes 8 normally closed high-pressure solenoid valves, multiple manual ball valves, and check valves;

[0013] The normally closed high-pressure solenoid valves include normally closed high-pressure solenoid valve 8# for controlling the SF6 gas circuit, normally closed high-pressure solenoid valve 2# for controlling the environmentally friendly insulating gas circuit, normally closed high-pressure solenoid valve 4# for controlling the vacuum circuit, and normally closed high-pressure solenoid valves 1#, 3#, 5#, 6#, and 7# for switching the recovery / filling process.

[0014] The manual ball valves include a gas recovery / filling port manual ball valve, an SF6 gas recovery quick-connect manual ball valve, an environmentally friendly insulating gas injection No. 1 manual ball valve, and an environmentally friendly insulating gas injection No. 2 manual ball valve, and their sealing elements have automatic compensation performance.

[0015] Furthermore, the compressor unit includes a compressor, a pre-compressor magnetic-assisted electric contact pressure transmitter, a post-compressor magnetic-assisted electric contact pressure transmitter, and a pressure reducing valve. The compressor is used to establish gas flow pressure. The pre-compressor magnetic-assisted electric contact pressure transmitter and the post-compressor magnetic-assisted electric contact pressure transmitter monitor the inlet and outlet pressures in real time and feed them back to the PLC measurement and control system. The pressure reducing valve reduces the high-pressure gas to a working pressure of 0.3-0.8 MPa.

[0016] Furthermore, the vacuum unit includes a vacuum pump, a vacuum gauge sensor, and a vacuum pressure gauge. The vacuum pump is used to evacuate the device itself and the GIS equipment to ≤10Pa. The vacuum gauge sensor works in conjunction with the vacuum gauge controller to achieve automatic monitoring of the vacuum level and control of the pump unit's start and stop.

[0017] Furthermore, the dry filter regenerator has a built-in electric heating device and a high-efficiency adsorbent to remove moisture, particulate impurities and oil from the gas, so that the micro-water content of the treated gas is ≤100μL / L. Its two ends are connected by stainless steel flanges for easy disassembly and assembly.

[0018] Furthermore, the electrical control cabinet includes a cabinet body, a gas type selection switch, a mode selection switch, a manual / automatic selection switch, an emergency stop button, a power indicator light, a start button, a stop button, and a PLC system. The PLC system is electrically connected to various sensors, valves, and the unit to achieve fully automated control of the entire process, supports manual / automatic mode switching, and has fault diagnosis and alarm functions.

[0019] Furthermore, it also includes gas mass flow controller 1# and gas mass flow controller 2#, which are respectively installed between environmentally friendly insulating gas injection 1# manual ball valve, environmentally friendly insulating gas injection 2# manual ball valve and normally closed high-pressure solenoid valve 1#, for precise control of the injection flow rate and ratio of single or mixed environmentally friendly gases.

[0020] Furthermore, the connecting pipeline adopts a welding process, and quick connectors are provided at key interfaces, including SF6 gas recovery port quick connector, environmentally friendly insulating gas injection port quick connector 1#, environmentally friendly insulating gas injection port quick connector 2#, and gas recovery / filling port quick connector, to achieve quick and sealed connection with GIS equipment or external tanks.

[0021] Beneficial effects

[0022] Significantly improved level of intelligence and automation: Adopting a PLC measurement and control system, it integrates real-time monitoring of multiple parameters such as temperature, pressure, and liquid level, realizing full-process automated control from gas recovery and purification to refueling, improving efficiency by more than 50% compared to traditional manual operation; Equipped with a fault self-shutdown protection system, it can automatically identify abnormalities such as pressure changes and filter blockage and shut down for protection, reducing the risk of human error.

[0023] Multi-gas compatibility and environmental performance optimization: Through the dual storage container design (independent storage of SF6 gas and environmentally friendly insulating gas) and mass flow controller, it supports precise switching and proportioning of SF6 gas and new environmentally friendly gases (such as C4F7N / CF3I mixed gas), adapting to the future low-carbon requirements of the power grid; The dry filter regenerator integrates electric heating and high-efficiency adsorbent, which can remove SF6 decomposition products (HF / SO2, etc.) and moisture (trace water content ≤100μL / L), and the purity of the recovered gas meets the IEC 60480 standard.

[0024] Safety and reliability are comprehensively enhanced: The closed gas circuit, combined with the high-pressure solenoid valve group (8 normally closed designs), ensures zero leakage of SF6 and toxic decomposition products; the vacuum pump and compressor work together to achieve a vacuum capacity of ≤10Pa and a residual gas recovery rate of ≥99.5%, far exceeding the 80% recovery rate of traditional equipment; the magnetically assisted electric contact pressure transmitter monitors the compressor unit pressure in real time to avoid the risk of overpressure.

[0025] Outstanding operational efficiency and economic benefits: Dual-mode operation (manual / automatic switching) adapts to different scenario needs, reducing the time for a single GIS equipment gas replacement operation to within 2 hours (compared to the traditional 4-6 hours); IoT remote monitoring enables cloud storage and analysis of data, supporting optimized operation and maintenance decisions and reducing labor costs by more than 30%; modular design (removable drying and filter unit) reduces the impact of contamination of the equipment components on gas quality; quick connector + manual ball valve double sealing structure ensures airtight connection while facilitating quick on-site disassembly and assembly.

[0026] Green and low-carbon contribution: By efficiently recovering SF6 gas (GWP=24300) and adapting environmentally friendly gases, we help achieve the "dual carbon" goal.

[0027] This invention addresses the pain points of traditional equipment, such as low efficiency, poor safety, and limited functionality, through three major innovations: intelligent control, multi-gas compatibility, and high-safety design. It provides an efficient, safe, and environmentally friendly integrated solution for insulating gas management in GIS equipment. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0029] Figure 2 This is a top view of an embodiment of the present invention;

[0030] Figure 3 This is a front view of an embodiment of the present invention;

[0031] Figure 4 This is a left view of an embodiment of the present invention;

[0032] Figure 5 This is a right view of an embodiment of the present invention;

[0033] Figure 6 This is a front view of an electrical control cabinet according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of an embodiment of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] As shown in the figure, the present invention discloses an automatic recovery and refilling device for insulating gas in GIS equipment, including a device base 1, a gas storage module, a processing module, a control module, and a connecting pipeline 40;

[0037] The equipment base provides a mounting base for the device;

[0038] The gas storage module includes an SF6 gas recovery and storage container 2 and an environmentally friendly insulating gas storage container 15, which are independently set up and equipped with an ultrasonic level gauge and a temperature sensor respectively. The SF6 gas recovery and storage container 2 is equipped with an SF6 gas recovery and storage container ultrasonic level gauge 3 and an SF6 gas recovery and storage container temperature sensor 4, and the environmentally friendly insulating gas storage container 15 is equipped with an environmentally friendly insulating gas storage container ultrasonic level gauge 17 and an environmentally friendly insulating gas storage container temperature sensor 16.

[0039] The processing module includes a compressor unit, a vacuum unit, a dryer-filter-regenerator 36, a heat exchanger 18, and a valve group. The compressor unit and the vacuum unit are connected by pipelines and are used for gas recovery and power output. The dryer-filter-regenerator 36 is used for gas purification, and the heat exchanger 18 realizes gas state conversion.

[0040] The control module includes an electrical control cabinet 5 with an integrated PLC measurement and control system, and a vacuum gauge controller 6, an SF6 gas concentration detection module 7, a trace moisture analyzer 8 and multiple sensors connected to the electrical control cabinet. The sensors are used to collect parameters such as temperature, pressure, liquid level and vacuum degree.

[0041] The connecting pipeline 40 adopts a sealed structure and controls the gas flow direction through a valve group to realize the automatic recovery, purification, storage and filling of insulating gas for GIS equipment.

[0042] It also includes a manual ball valve 14 for the pipeline before the insulating gas storage container, which is installed in the pipeline at the front end of the environmentally friendly insulating gas storage container 15. Its sealing element has automatic compensation performance to ensure the airtightness of the device. It is used to open and close the pipeline when the environmentally friendly insulating gas is temporarily injected into the environmentally friendly insulating gas storage container 15 for storage.

[0043] The environmentally friendly insulating gas storage container temperature sensor 16 is installed on the top of the new environmentally friendly insulating gas storage container 15. Data is transmitted between the sensor and the electrical control cabinet 5 via a signal cable. The sensor is used to monitor the temperature inside the environmentally friendly insulating gas storage container 15 and provide real-time feedback to the integrated PLC monitoring and control system in the electrical control cabinet 5.

[0044] The ultrasonic level gauge 17 of the environmentally friendly insulating gas storage container is installed on the top of the tank of the environmentally friendly insulating gas storage container 15. It transmits data with the electrical control cabinet 5 via a signal cable. It is used to monitor the liquid level of the liquefied insulating gas in the environmentally friendly insulating gas storage container 15 and feeds back to the integrated PLC measurement and control system in the electrical control cabinet 5 in real time.

[0045] The heat exchanger 18 is installed in the pipeline directly between the check valve 20 and the normally closed high-pressure solenoid valve 7#38. It uses high-pressure copper tubes with high-density fins for liquefaction and vaporization of insulating gas.

[0046] The trace moisture analyzer 8 is installed on the outside of the electrical control cabinet 5 and fixed with bolts. It is used in conjunction with the trace moisture analyzer probe 35. Data is transmitted between the two via a signal cable to measure the moisture content of the insulating gas in the pipe of the measuring device.

[0047] The SF6 gas concentration detection module 7 is installed on the outside of the electrical control cabinet 5 and fixed with bolts. It is used in conjunction with the SF6 gas concentration detection probe 34. Data is transmitted between the two via a signal cable. The module measures the SF6 gas concentration in the device pipeline and feeds it back to the electrical control cabinet 5. Based on the preset values, the module determines whether the SF6 gas in the GIS device has been completely recovered and proceeds to the next step.

[0048] The vacuum gauge controller 6 is installed on the outside of the electrical control cabinet 5 and fixed with bolts. It is used in conjunction with the vacuum gauge sensor 28. Data is transmitted between the two via a signal cable. The controller is used to measure the vacuum level in the device pipeline in real time and feed it back to the electrical control cabinet 5. Based on the preset values, the controller controls the operation and stop of the vacuum pump 25.

[0049] The SF6 gas recovery and storage container temperature sensor 4 is installed on the top of the SF6 gas recovery and storage container 2. It transmits data to the electrical control cabinet 5 via a signal cable, monitors the temperature inside the SF6 gas recovery and storage container 2, and feeds back the data in real time to the PLC measurement and control system integrated in the electrical control cabinet 5.

[0050] The ultrasonic level gauge 3 of the SF6 gas recovery and storage container is installed on the top of the SF6 gas recovery and storage container 2. It transmits data to the electrical control cabinet 5 via a signal cable, monitors the liquefied SF6 level in the SF6 gas recovery and storage container 2, and feeds back the data in real time to the integrated PLC monitoring and control system in the electrical control cabinet 5. The critical temperature of SF6 gas is 45.55°C, and it is usually liquefied at room temperature by pressurization (e.g., about 2 MPa pressure is required at 20°C).

[0051] The SF6 gas recovery and storage container 2 is installed between the SF6 gas recovery quick-connect manual ball valve 12 and the normally closed high-pressure solenoid valve 8#39. It is used to process, recover and store the existing SF6 gas in the GIS equipment. An electric heater is installed at the bottom of the container to fully vaporize the liquefied SF6 gas.

[0052] In one embodiment of the present invention, the valve group includes 8 normally closed high-pressure solenoid valves, multiple manual ball valves, and check valve 20;

[0053] The check valve 20 is installed in the pipeline between the heat exchanger 18 and the compressor downstream magnetic-assisted electric contact pressure transmitter 21. It is a one-way valve. During the recovery phase: when the compressor stops working, the check valve automatically closes, preventing the recovered SF6 gas or environmentally friendly insulating gas from flowing back from the storage tank to the GIS equipment, thus avoiding gas waste and secondary pollution of the equipment. During the filling phase: it ensures that the newly added insulating gas flows unidirectionally to the GIS equipment, preventing residual gas or impurities in the equipment from backflowing and contaminating the gas source.

[0054] The normally closed high-pressure solenoid valves include normally closed high-pressure solenoid valve 8# 39 for controlling the SF6 gas circuit, normally closed high-pressure solenoid valve 2# 19 for controlling the environmentally friendly insulating gas circuit, normally closed high-pressure solenoid valve 4# 27 for controlling the vacuum circuit, and normally closed high-pressure solenoid valves 1# 13, 3# 24, 5# 30, 6# 31, and 7# 38 for switching the recovery / refilling process;

[0055] The normally closed high-pressure solenoid valve 1#13 is installed in the pipeline between the gas mass flow controller 1#43 and the normally closed high-pressure solenoid valve 3#24. It adopts the normally closed mode. When the coil is energized, the valve body opens and when the coil is de-energized, the valve body closes.

[0056] The normally closed high-pressure solenoid valve 2#19 is installed in the pipeline between the environmentally friendly insulating gas storage container 15 and the normally closed high-pressure solenoid valve 3#24. It adopts the normally closed mode. When the coil is energized, the valve body opens and when the coil is de-energized, the valve body closes.

[0057] The normally closed high-pressure solenoid valve 3#24 is installed in the pipeline between the normally closed high-pressure solenoid valve 2#19 and the normally closed high-pressure solenoid valve 5#30. It adopts the normally closed mode. When the coil is energized, the valve body opens and when the coil is de-energized, the valve body closes.

[0058] The normally closed high-pressure solenoid valve 4#27 is a high-pressure solenoid valve in the front pipeline of vacuum pump 25. It is used to open and close the pipeline when vacuuming. It adopts a normally closed mode. When the coil is energized, the valve body opens and when the coil is de-energized, the valve body closes.

[0059] The normally closed high-pressure solenoid valve 5#30 is installed in the pipeline between normally closed high-pressure solenoid valve 3#24 and normally closed high-pressure solenoid valve 6#31. It adopts the normally closed mode. When the coil is energized, the valve body opens and when the coil is de-energized, the valve body closes.

[0060] The normally closed high-pressure solenoid valve 6#31 is installed in the pipeline between the normally closed high-pressure solenoid valve 5#30 and the dryer filter regenerator 36. It adopts the normally closed mode. When the coil is energized, the valve body opens and when the coil is de-energized, the valve body closes.

[0061] The normally closed high-pressure solenoid valve 7#38 is installed in the pipeline between the heat exchanger 18 and the electric regulating valve 37. It adopts the normally closed mode. When the coil is energized, the valve body opens and when the coil is de-energized, the valve body closes.

[0062] The normally closed high-pressure solenoid valve 8#39 is installed in the pipeline between the heat exchanger 18 and the SF6 gas recovery storage container 2. It adopts the normally closed mode. When the coil is energized, the valve body opens and when the coil is de-energized, the valve body closes.

[0063] The manual ball valves include a gas recovery / filling port manual ball valve 32, an environmentally friendly insulating gas storage container front pipeline manual ball valve 14, an SF6 gas recovery quick-connect manual ball valve 12, an environmentally friendly insulating gas injection #1 manual ball valve 10, and an environmentally friendly insulating gas injection #2 manual ball valve 42, all of which have sealing elements with automatic compensation performance. The SF6 gas recovery quick-connect manual ball valve 12, with its sealing element having automatic compensation performance, ensures the airtightness of the device and is used for opening and closing when SF6 gas is recovered to external containers.

[0064] The manual ball valve for the front pipeline of the environmentally friendly insulating gas storage container is installed in the front pipeline of the environmentally friendly insulating gas storage container 15. Its sealing element has automatic compensation performance to ensure the airtightness of the device. It is used to open and close the pipeline when the new environmentally friendly insulating gas is temporarily injected into the new environmentally friendly insulating gas storage container 15 for storage.

[0065] The environmentally friendly insulating gas storage container 15 is installed between the manual ball valve 14 and the normally closed high-pressure solenoid valve 2#19 in the front pipeline of the new environmentally friendly insulating gas storage container. It can be used for pre-storage before the filling of insulating gas. An electric heater is provided at the bottom of the container to fully vaporize the liquefied insulating gas.

[0066] The environmentally friendly insulating gas injection manual ball valve 42 is installed in the pipeline downstream of the environmentally friendly insulating gas injection port quick connector 2#41. Its sealing element has automatic compensation performance to ensure the airtightness of the device. It is used to open and close the gas injection device when connected to the pipeline 40.

[0067] In one embodiment of the present invention, the compressor unit includes a compressor 23, a pre-compressor magnetic-assisted electric contact pressure transmitter 22, a post-compressor magnetic-assisted electric contact pressure transmitter 21, and a pressure reducing valve 26. The compressor 23 is used to establish gas flow pressure. The pre-compressor magnetic-assisted electric contact pressure transmitter 22 and the post-compressor magnetic-assisted electric contact pressure transmitter 21 monitor the inlet and outlet pressures in real time and feed them back to the PLC measurement and control system. The pressure reducing valve 26 reduces the high-pressure gas to a working pressure of 0.3-0.8 MPa.

[0068] The compressor-stage magnetic-assisted electric contact pressure transmitter 21 is installed in the pipeline at the rear end of the compressor 23. It transmits data to the electrical control cabinet 5 via a signal cable, monitors the gas pressure at the compressor outlet in real time, and converts the mechanical pressure signal into a 4-20mA standard electrical signal, which is then transmitted to the integrated PLC measurement and control system in the electrical control cabinet 5.

[0069] The compressor front-stage magnetic-assisted electric contact pressure transmitter 22 is installed in the front-end pipeline of the compressor 23. It transmits data with the electrical control cabinet 5 via a signal cable, monitors the gas pressure at the compressor inlet in real time, and converts the mechanical pressure signal into a 4-20mA standard electrical signal to be transmitted to the integrated PLC measurement and control system in the electrical control cabinet 5.

[0070] The compressor 23 is installed in the pipeline between the compressor's downstream magnetic-assisted electric contact pressure transmitter 21 and the compressor's upstream magnetic-assisted electric contact pressure transmitter 22. It is connected to the electrical control cabinet 5 via a power cable for power output. The control unit is installed inside the electrical control cabinet 5. In the GIS equipment insulating gas recovery and filling device, the compressor, as the core power unit, is mainly responsible for establishing negative pressure to extract insulating gas (SF6 or environmentally friendly gas) from the GIS equipment; compressing the low-pressure gas to 0.8-1.5MPa (adjustable) and then delivering it to the gas storage / purification system; and maintaining a constant output pressure during the gas filling stage.

[0071] The pressure reducing valve 26 is installed in the pipeline between the compressor front-stage magnetic-assisted electric contact pressure transmitter 22 and the normally closed high-pressure solenoid valve 5#30. It stably reduces the high-pressure gas (1.0-15MPa) from the gas source (gas cylinder / compressor) to the working pressure (0.3-0.8MPa adjustable). When the pressure is over-pressurized, the pressure relief channel is automatically opened to provide differentiated pressure settings for different insulating gases (SF6 / C4F7N, etc.).

[0072] In one embodiment of the present invention, the vacuum unit includes a vacuum pump 25, a vacuum sensor 28, and a vacuum pressure gauge 29. The vacuum pump 25 is used to evacuate the device itself and the GIS equipment to ≤10Pa. The vacuum sensor 28 cooperates with the vacuum controller 6 to realize automatic monitoring of vacuum degree and pump start-stop control.

[0073] The vacuum pump 25 is installed in the pipeline behind the normally closed high-pressure solenoid valve 4#27, and is connected to the electrical control cabinet 5 by a power cable for power output. The control unit is installed inside the electrical control cabinet 5. In the GIS equipment insulating gas recovery and filling device, the vacuum pump undertakes the key system pre-processing and quality assurance functions. Its main functions are to evacuate the GIS cavity and device pipeline to less than or equal to 10 Pa (absolute pressure) before gas filling; to completely remove residual air / moisture inside the equipment to ensure the purity of the insulating medium; and to determine the equipment sealing through the vacuum sensor 28 and vacuum pressure gauge 29 and to realize automatic start and stop in conjunction with the PLC.

[0074] The vacuum pressure gauge 29 is installed in the pipeline between the normally closed high-pressure solenoid valve 4#27 and the manual ball valve 32 of the gas recovery / filling port. It is a pointer-type mechanical vacuum pressure gauge used to measure the vacuum pressure in the pipeline or GIS equipment when the vacuum pump 25 is running. It has the same function as the vacuum sensor 28 and is only used for direct observation. It does not perform any related measurement and control functions.

[0075] The vacuum sensor 28 is installed in the pipeline between the normally closed high-pressure solenoid valve 4#27 and the manual ball valve 32 of the gas recovery / filling port. It is used in conjunction with the vacuum controller 6 and transmits data to the electrical control cabinet 5 via a signal cable. It monitors the vacuum level in the pipeline or GIS equipment in real time and converts the signal into a 4-20mA standard electrical signal, which is then transmitted to the PLC measurement and control system integrated in the electrical control cabinet 5.

[0076] In one embodiment of the present invention, the dry filter regenerator 36 has a built-in electric heating device and a high-efficiency adsorbent for removing moisture, particulate impurities and oil from the gas, so that the micro-water content of the treated gas is ≤100μL / L, and its two ends are connected by stainless steel flanges for easy disassembly and assembly.

[0077] In one embodiment of the present invention, the electrical control cabinet includes a cabinet 100, a gas type selection switch 101, a mode selection switch 102, a manual / automatic selection switch 103, an emergency stop button 104, a power indicator light 105, a start button 106, a stop button 107, an HMI human-machine interface 108 and corresponding electrical circuits, and a PLC system. The PLC system is electrically connected to various sensors, valves, and units to realize full-process automated control, supports manual / automatic mode switching, and has fault diagnosis and alarm functions.

[0078] In one embodiment of the present invention, gas mass flow controller 1# 43 and gas mass flow controller 2# 44 are further included, which are respectively installed between environmentally friendly insulating gas injection 1# manual ball valve 10, environmentally friendly insulating gas 2# manual ball valve 42 and normally closed high-pressure solenoid valve 1# 13, for precisely controlling the injection flow rate and ratio of single or mixed environmentally friendly gases. The environmentally friendly insulating gas injection 1# manual ball valve 10 is installed in the pipeline downstream of the environmentally friendly insulating gas injection port quick connector 1# 9, and its sealing element has automatic compensation performance to ensure the airtightness of the device, and is used for opening and closing the gas injection device.

[0079] In one embodiment of the present invention, the connecting pipeline adopts a welding process, and quick connectors are provided at key interfaces, including SF6 gas recovery port quick connector 11, environmentally friendly insulating gas injection port quick connector 1# 9, environmentally friendly insulating gas injection port quick connector 2# 41, and gas recovery / filling port quick connector 33, to achieve quick and sealed connection with GIS equipment or external tanks.

[0080] The manual ball valve 32 of the gas recovery / filling port is installed in the pipeline downstream of the gas recovery / filling port quick connector 3. After the gas recovery / filling port quick connector 33 is reliably connected to the GIS equipment, it is used to open or close the pipeline inside the device during recovery and filling.

[0081] The gas recovery / filling port quick connector 33 is connected to the GIS equipment, which facilitates quick connection and disconnection, improving its convenience.

[0082] The environmentally friendly insulating gas injection port quick connector 2#41 is a quick connection interface to the new environmentally friendly insulating gas external filling tank, which facilitates quick connection and disconnection and improves its convenience.

[0083] It also includes an SF6 gas concentration detection probe 34, which is installed in the pipeline between the normally closed high-pressure solenoid valve 6# 31 and the dryer-filter-regenerator 36. It is used to detect the SF6 gas concentration value in the pipeline after the insulating gas is processed by the dryer-filter-regenerator 36, and is used in conjunction with the SF6 gas concentration detection module 7.

[0084] It also includes a trace moisture analyzer probe 35, which is installed in the pipeline between the normally closed high-pressure solenoid valve 6#31 and the dryer-filter-regenerator 36. It is used to detect the moisture content of the insulating gas in the pipeline after the insulating gas has been treated by the dryer-filter-regenerator 36. For the acceptance value of newly charged SF6 gas, it is less than or equal to 150 μL / L (volume ratio, at 20℃). For new environmentally friendly insulating gases (such as C4F7N mixed gas), the acceptance value is less than or equal to 100 μL / L (volume ratio, at 20℃). It is used in conjunction with the trace moisture analyzer 8.

[0085] It also includes an electric regulating valve 37, which is installed between the dryer filter regenerator 36 and the normally closed high-pressure solenoid valve 7#38. The regulating valve is used in the insulating gas recovery and filling device to precisely control the gas flow and pressure, so as to achieve stable operation and safe switching of processes such as recovery, purification and filling.

[0086] The dry filter regenerator 36 is installed in the pipeline between the normally closed high-pressure solenoid valve 6#31 and the electric regulating valve 37. The dry filter regenerator 36 is connected at both ends by stainless steel flanges, seals, bolts and pipelines. If replacement is required in the future, it is easy to remove and install. It adopts built-in electric heating and internal high-efficiency adsorbent, and has strong self-regeneration ability, so that the insulating gas can be regenerated and dried to remove moisture, particulate impurities and oil from the insulating gas to ensure the purity of the insulating gas.

[0087] The gas mass flow controller 2#44 is installed in the pipeline between the environmentally friendly insulating gas injection 2# manual ball valve 42 and the normally closed high-pressure solenoid valve 1#13. It can be operated alone or in conjunction with the gas mass flow controller 1#43 to realize the application of various proportions of mixed insulating gases. It is used to accurately measure and control the gas mass flow. The mass flow sensor measures the pressure difference and temperature change when the environmentally friendly insulating gas flows through the pipeline, and then calculates the gas mass flow. The gas flow is adjusted by controlling the valve.

[0088] The gas mass flow controller 1#43 is installed in the pipeline between the environmentally friendly insulating gas injection 1# manual ball valve 10 and the normally closed high-pressure solenoid valve 1#13. It can be operated alone or in conjunction with the gas mass flow controller 2#44 to realize the application of new insulating gases with multiple proportions.

[0089] The SF6 gas recovery port quick connector 11 is a quick connection interface to the external SF6 gas recovery tank, which facilitates quick connection and disconnection, improving its convenience.

[0090] The environmentally friendly insulating gas injection port quick connector 1#9 is a quick connection interface to the external filling tank of environmentally friendly insulating gas, which facilitates quick connection and disconnection and improves its convenience.

[0091] The operation steps of this invention are as follows:

[0092] The specific steps are as follows:

[0093] 1. Evacuate the device itself.

[0094] Step 1: Before powering on the device, check the power supply and ensure that the wiring terminals of each control circuit and power circuit in the electrical control cabinet 5 are secure. After confirming that everything is correct, manually close the following valves: Environmentally friendly insulating gas injection No. 1 manual ball valve 10, SF6 gas recovery quick connector manual ball valve 12, environmentally friendly insulating gas storage container front pipeline manual ball valve 14, gas recovery / filling port manual ball valve 32, and environmentally friendly insulating gas injection No. 2 manual ball valve 42.

[0095] Step 2: Power on the device, rotate the automatic selector switch 103 on the electrical control cabinet 5 to manual mode, and operate the normally closed high-pressure solenoid valves 1#13, 2#19, 3#24, 4#27, and 5# on the HMI human-machine interface 108 respectively.

[0096] 30. Open normally closed high-pressure solenoid valve #6; 31. Open normally closed high-pressure solenoid valve #7; 38. Open normally closed high-pressure solenoid valve #8; 39. Confirm that the entire system reports no pressure. If there is pressure, the five manual valves in step 1 need to be opened.

[0097] Release the pressure to 0 gauge pressure and then close the manual valve.

[0098] Step 3: Rotate the automatic selection switch 103 on the electrical control cabinet 5 to automatic mode. In the HMI human-machine interface 108, select the device itself vacuuming option. The system will sequentially open normally closed high-pressure solenoid valves 1#13, 2#19, 3#24, 4#27, 5#30, 6#31, 7#38, and 8#39. Press the start button 106, and the vacuum pump will start running to evacuate the device itself.

[0099] Step 4: Observe the mechanical pointer indication of vacuum pressure gauge 29 and the vacuum degree value collected by vacuum gauge controller 6. When vacuum gauge controller 6 shows that the ultimate vacuum has been reached, that is, after evacuating to ≤10Pa, maintain the pressure for 30 minutes. If the vacuum degree fluctuation is ≤5Pa, it is considered that the sealing is qualified. The system stops the evacuation process of the device itself. The normally closed high-pressure solenoid valves 1#13, 2#19, 3#24, 4#27, 5#30, 6#31, 7#38, and 8#39 are de-energized and closed in sequence.

[0100] Step 5: The vacuuming process of the device itself is now complete.

[0101] 2. Vacuuming the GIS equipment

[0102] Step 1: Before powering on the device, check the power supply and ensure that the wiring terminals of each control circuit and power circuit in the electrical control cabinet 5 are secure. After confirming that everything is correct, manually close the environmentally friendly insulating gas injection No. 1 manual ball valve 10, the SF6 gas recovery quick connector manual ball valve 12, the environmentally friendly insulating gas storage container front pipeline manual ball valve 14, and the environmentally friendly insulating gas injection No. 2 manual ball valve 42. Use a matching stainless steel hose to reliably connect the GIS equipment to the gas recovery / filling port quick connector 33, and manually open the gas recovery / filling port manual ball valve 32.

[0103] Step 2: Power on the device, rotate the manual / automatic selector switch 103 of the electrical control cabinet 5 to automatic mode, and select the GIS equipment vacuuming option in the HMI human-machine interface 108.

[0104] Step 3: The system controls the normally closed high-pressure solenoid valve 4#27 to open, while other valves remain closed by default. Step 4: Press the start button 106; the vacuum pump will begin running to evacuate the GIS equipment.

[0105] Step 5: Observe the mechanical pointer indication of vacuum pressure gauge 29 and the vacuum degree value collected by vacuum gauge controller 6. When vacuum gauge controller 6 shows that the ultimate vacuum has been reached, that is, after evacuating to ≤10Pa, maintain the pressure for 30 minutes. If the vacuum degree fluctuation is ≤5Pa, it is considered that the sealing is qualified. The system stops the vacuuming process of GIS equipment, and the normally closed high-pressure solenoid valve 4#27 is de-energized and closed.

[0106] Step 6: The vacuuming process for the GIS equipment is now complete.

[0107] III. Recovery and storage of SF6 gas within GIS equipment

[0108] Step 1: Before powering on the device, check the power supply and ensure that the wiring terminals of each control circuit and power circuit in the electrical control cabinet 5 are secure. After confirming that everything is correct, manually close the environmentally friendly insulating gas injection No. 1 manual ball valve 10, the SF6 gas recovery quick connector manual ball valve 12, the environmentally friendly insulating gas storage container front pipeline manual ball valve 14, and the environmentally friendly insulating gas injection No. 2 manual ball valve 42. Use a matching stainless steel hose to reliably connect the GIS equipment to the gas recovery / filling port quick connector 33, and manually open the gas recovery / filling port manual ball valve 32.

[0109] Step 2: Power on the device, rotate the manual automatic selection switch 103 on the electrical control cabinet 5 to automatic mode, rotate the gas type selection switch 101 to SF6 gas, and rotate the mode selection switch 102 to recovery mode.

[0110] Step 3: The system sequentially controls the normally closed high-pressure solenoid valves 5#30 and 8#39 to open, while other valves remain closed by default.

[0111] Step 4: The devices that the SF6 gas recovery process passes through in sequence are: manual ball valve 32 at the gas recovery / filling port, normally closed high-pressure solenoid valve 5#30, pressure reducing valve 26, compressor front-stage magnetic-assisted electric contact pressure transmitter 22, compressor 23, compressor rear-stage magnetic-assisted electric contact pressure transmitter 21, check valve 20, heat exchanger 18, normally closed high-pressure solenoid valve 8#39, and finally to the SF6 gas recovery storage container 2.

[0112] Step 5: Press the start button 106 to start the system. The compressor 23 starts running. Adjust the pressure reducing valve 26 so that the feedback value displayed by the compressor front magnetic-assisted electric contact pressure transmitter 22 is less than 0.15 MPa, and recover SF6 gas.

[0113] Step 6: When the feedback value of the compressor front-stage magnetic-assisted electric contact pressure transmitter 22 is lower than 0.05MPA or reaches the required recovery final value, the system sequentially controls the normally closed high-pressure solenoid valve 8#39 and normally closed high-pressure solenoid valve 5#30 to close, and the compressor 23 stops running.

[0114] Step 7: The SF6 gas recovery and storage process within the GIS equipment is now complete.

[0115] IV. SF6 gas transfer within the recovery unit container

[0116] After the SF6 gas recovery and storage process in the GIS equipment is completed, the SF6 gas in the recovery device container is transferred to the SF6 gas treatment center for recycling.

[0117] Step 1: Reliably connect the treatment center unit to the SF6 gas recovery port quick connector 11 using a matching stainless steel hose.

[0118] Step 2: Manually open the manual ball valve 12 of the SF6 gas recovery quick connector, rotate the automatic selection switch 103 on the electrical control cabinet 5 to manual mode, rotate the gas type selection switch 101 to SF6 gas, and rotate the mode selection switch 102 to recovery mode.

[0119] Step 3: Turn on the electric heater in SF6 gas recovery and storage container 2 in the HMI human-machine interface 108 to vaporize SF6 until the transfer is complete.

[0120] V. Single environmentally friendly insulating gas is added to GIS equipment.

[0121] Step 1: Before powering on the device, check the power supply and ensure that the wiring terminals of each control circuit and power circuit in the electrical control cabinet 5 are secure. Ensure that the device itself and the GIS equipment have been evacuated. Otherwise, the device itself and the GIS equipment need to be evacuated in advance. The specific method is to follow the procedures in steps 1 and 2 above.

[0122] Step 2: Ensure all valves are closed. Proceed to the next step after confirming everything is in order.

[0123] Step 3: Connect the environmentally friendly insulating gas cylinder to the new environmentally friendly insulating gas injection port quick connector 1#9 using a matching stainless steel hose, and reliably connect the gas recovery / filling port quick connector 33 to the GIS equipment.

[0124] Step 4: Power on the device, rotate the manual automatic selection switch 103 on the electrical control cabinet 5 to automatic mode, rotate the gas type selection switch 101 to non-SF6 gas, rotate the mode selection switch 102 to refueling mode, and open the new environmentally friendly insulating gas injection #1 manual ball valve 10 and the gas recovery / refueling port manual ball valve 32.

[0125] Step 5: The system sequentially controls the opening of normally closed high-pressure solenoid valves 1#13, 3#24, 7#38, and 6#31.

[0126] Step 6: Press the start button 106, the system starts running, and the compressor 23 starts running.

[0127] Step 7: The devices passing through during the filling process are, in sequence, environmentally friendly insulating gas injection port quick connector 1#9, new environmentally friendly insulating gas injection 1# manual ball valve 10, gas mass flow controller 1#43, normally closed high-pressure solenoid valve 1#13, normally closed high-pressure solenoid valve 3#24, pressure reducing valve 26, compressor front-stage magnetic-assisted electric contact pressure transmitter 22, compressor 23, compressor rear-stage magnetic-assisted electric contact pressure transmitter 21, check valve 20, heat exchanger 18, normally closed high-pressure solenoid valve 7#38, electric regulating valve 37, dryer filter regenerator 36, normally closed high-pressure solenoid valve 6#31, gas recovery / filling port manual ball valve 32, gas recovery / filling port quick connector 33, and finally to the GIS equipment.

[0128] Step 8: When the required pressure value is reached inside the GIS equipment, the filling is complete.

[0129] VI. Proportional mixing of dual environmentally friendly insulating gases and their addition to GIS equipment.

[0130] Step 1: Before powering on the device, check the power supply and ensure that the wiring terminals of each control circuit and power circuit in the electrical control cabinet 5 are secure. Ensure that the device itself and the GIS equipment have been evacuated. Otherwise, the device itself and the GIS equipment need to be evacuated in advance. The specific method is to follow the procedures in steps 1 and 2 above.

[0131] Step 2: Ensure all valves are closed. Proceed to the next step after confirming everything is in order.

[0132] Step 3: Connect the environmentally friendly insulating gas cylinder 1# to the new environmentally friendly insulating gas injection port quick connector 1#9 using the matching stainless steel hose, connect the environmentally friendly insulating gas cylinder 2# to the new environmentally friendly insulating gas injection port quick connector 2#41, and reliably connect the gas recovery / filling port quick connector 33 to the GIS equipment.

[0133] Step 4: Power on the device, rotate the manual / automatic selection switch 103 on the electrical control cabinet 5 to automatic mode, rotate the gas type selection switch 101 to non-SF6 gas, rotate the mode selection switch 102 to filling mode, set the gas mass flow controller 1#43 and gas mass flow controller 2#44 to two insulating gas filling ratios, and open the new environmentally friendly insulating gas injection 1# manual ball valve 10, the new environmentally friendly insulating gas injection 2# manual ball valve 42 and the gas recovery / filling port manual ball valve 32.

[0134] Step 5: The system sequentially controls the opening of normally closed high-pressure solenoid valves 1#13, 3#24, 7#38, and 6#31.

[0135] Step 6: Press the start button 106, the system starts running, and the compressor 23 starts running.

[0136] Step 7: The devices passing through during the filling process are, in sequence: new environmentally friendly insulating gas injection port quick connector 1#9, new environmentally friendly insulating gas injection 1# manual ball valve 10, gas mass flow controller 1#43, new environmentally friendly insulating gas injection port quick connector 2#41, new environmentally friendly insulating gas injection 2# manual ball valve 42, gas mass flow controller 2#44, normally closed high-pressure solenoid valve 1#13, normally closed high-pressure solenoid valve 3#24, pressure reducing valve 26, compressor front-stage magnetic-assisted electric contact pressure transmitter 22, compressor 23, compressor rear-stage magnetic-assisted electric contact pressure transmitter 21, check valve 20, heat exchanger 18, normally closed high-pressure solenoid valve 7#38, electric regulating valve 37, dryer filter regenerator 36, normally closed high-pressure solenoid valve 6#31, gas recovery / filling port manual ball valve 32, gas recovery / filling port quick connector 33, and finally to the GIS equipment.

[0137] Step 8: When the required pressure value is reached inside the GIS equipment, the filling is complete.

[0138] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. An automatic recovery and refilling device for insulating gas in GIS equipment, characterized in that: It includes an equipment base, a gas storage module, a processing module, a control module, and connecting pipelines; The equipment base provides a mounting base for the device; The gas storage module includes an SF6 gas recovery storage container and an environmentally friendly insulating gas storage container, which are set up independently and are equipped with an ultrasonic level gauge and a temperature sensor respectively. The processing module includes a compressor unit, a vacuum unit, a dryer-filter-regenerator, a heat exchanger, and a valve group. The compressor unit and the vacuum unit are connected by pipelines for gas recovery and power output. The dryer-filter-regenerator is used for gas purification, and the heat exchanger realizes gas state conversion. The control module includes an electrical control cabinet with an integrated PLC measurement and control system, and a vacuum gauge controller, an SF6 gas concentration detection module, a trace moisture analyzer, and multiple sensors connected to the electrical control cabinet. The sensors are used to collect parameters such as temperature, pressure, liquid level, and vacuum degree. The connecting pipeline adopts a sealed structure, and the gas flow direction is controlled by a valve group to realize the automatic recovery, purification, storage and filling of insulating gas for GIS equipment.

2. The automatic recovery and refueling device for insulating gas in GIS equipment according to claim 1, characterized in that: The valve group includes 8 normally closed high-pressure solenoid valves, multiple manual ball valves, and check valves; The normally closed high-pressure solenoid valves include normally closed high-pressure solenoid valve 8# for controlling the SF6 gas circuit, normally closed high-pressure solenoid valve 2# for controlling the environmentally friendly insulating gas circuit, normally closed high-pressure solenoid valve 4# for controlling the vacuum circuit, and normally closed high-pressure solenoid valves 1#, 3#, 5#, 6#, and 7# for switching the recovery / filling process. The manual ball valves include a gas recovery / filling port manual ball valve, an environmentally friendly insulating gas storage container front pipeline manual ball valve, an SF6 gas recovery quick-connect manual ball valve, an environmentally friendly insulating gas injection No. 1 manual ball valve, and an environmentally friendly insulating gas injection No. 2 manual ball valve, and their sealing elements have automatic compensation performance.

3. The automatic recovery and refueling device for insulating gas in GIS equipment according to claim 1, characterized in that: The compressor unit includes a compressor, a pre-compressor magnetic-assisted electric contact pressure transmitter, a post-compressor magnetic-assisted electric contact pressure transmitter, and a pressure reducing valve. The compressor is used to establish gas flow pressure. The pre-compressor magnetic-assisted electric contact pressure transmitter and the post-compressor magnetic-assisted electric contact pressure transmitter monitor the inlet and outlet pressures in real time and feed them back to the PLC measurement and control system. The pressure reducing valve reduces the high-pressure gas to a working pressure of 0.3-0.8 MPa.

4. The automatic recovery and refueling device for insulating gas in GIS equipment according to claim 1, characterized in that: The vacuum unit includes a vacuum pump, a vacuum gauge sensor, and a vacuum pressure gauge. The vacuum pump is used to evacuate the device itself and the GIS equipment to ≤10Pa. The vacuum gauge sensor works in conjunction with the vacuum gauge controller to realize automatic monitoring of the vacuum level and control of the pump unit's start and stop.

5. The automatic recovery and refueling device for insulating gas in GIS equipment according to claim 1, characterized in that: The dry filter regenerator has a built-in electric heating device and a high-efficiency adsorbent to remove moisture, particulate impurities and oil from the gas, so that the micro-water content of the treated gas is ≤100μL / L. Its two ends are connected by stainless steel flanges.

6. The automatic recovery and refueling device for insulating gas in GIS equipment according to claim 1, characterized in that: The electrical control cabinet includes a cabinet body, a gas type selection switch, a mode selection switch, a manual / automatic selection switch, an emergency stop button, a power indicator light, a start button, a stop button, and a PLC system. The PLC system is electrically connected to various sensors, valves, and the unit to achieve fully automated control of the entire process.

7. The automatic recovery and refueling device for insulating gas in GIS equipment according to claim 2, characterized in that: It also includes gas mass flow controller 1# and gas mass flow controller 2#, which are respectively installed between environmentally friendly insulating gas injection 1# manual ball valve, environmentally friendly insulating gas 2# manual ball valve and normally closed high-pressure solenoid valve 1#, for precise control of the injection flow rate and ratio of single or mixed environmentally friendly gases.

8. The automatic recovery and refueling device for insulating gas in GIS equipment according to claim 3, characterized in that: The connecting pipeline adopts welding technology, and quick connectors are provided at key interfaces, including SF6 gas recovery port quick connector, environmentally friendly insulating gas injection port quick connector 1#, environmentally friendly insulating gas injection port quick connector 2#, and gas recovery / filling port quick connector, to achieve quick and sealed connection with GIS equipment or external tanks.

9. The automatic recovery and refueling device for insulating gas in GIS equipment according to claim 1, characterized in that: It also includes a manual ball valve for the pipeline before the insulating gas storage container, which is installed in the pipeline at the front end of the environmentally friendly insulating gas storage container; It also includes an electric regulating valve, which is installed between the dryer filter regenerator and the normally closed high-pressure solenoid valve #7. The regulating valve is used in the insulating gas recovery and filling device to precisely control the gas flow and pressure, so as to achieve stable operation and safe switching of the recovery, purification and filling process.

10. The automatic recovery and refueling device for insulating gas in GIS equipment according to claim 2, characterized in that: It also includes an SF6 gas concentration detection probe, which is installed in the pipeline between the normally closed high-pressure solenoid valve 6# and the dryer-filter-regenerator, and is used to detect the SF6 gas concentration value in the pipeline after the insulating gas is treated by the dryer-filter-regenerator. It also includes a trace moisture analyzer probe, which is installed in the pipeline between the normally closed high-pressure solenoid valve 6# and the dryer-filter-regenerator, and is used to detect the moisture content of the insulating gas in the pipeline after the insulating gas has been treated by the dryer-filter-regenerator.

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