Online treatment system and method for insulating gas of electrical equipment

Abstract

The invention discloses an online treatment system and method for insulating gas of electrical equipment. The system comprises a mass flow detection device, a first purification device and a gas driving device which are arranged on a main treatment loop, the gas detection device is arranged on the detection bypass; and a control device. The mass flow detection device is used for detecting the accumulative recovered gas mass and the accumulative recharged gas mass; the first purification device is used for purifying to-be-treated gas; the gas driving device is used for driving the gas to pass through the purification device and recharge the electrical equipment; the gas detection device is used for detecting gas in real time; and the control device obtains the gas quality according to the real-time detection data, controls the gas driving device to operate, and stops recharging when the quality difference value of the recycled gas and the recharged gas is smaller than or equal to a preset threshold value. The system can further comprise a frequency conversion adjusting function, various connecting pipeline configurations, a vacuumizing device and the like, efficient online treatment of the insulating gas can be achieved, and the operation reliability of electrical equipment is improved.

Description

Technical Field

[0001] The present application relates to the technical field of insulating gas processing, and in particular to an online processing system and method for insulating gas of electrical equipment. Background Art

[0002] Gas-insulated electrical equipment (GIS) is protected by insulating gas that meets specified standards. Therefore, ensuring the quality of the insulating gas within this equipment is crucial for its safe operation. However, when the insulating gas within operating equipment exhibits excessive humidity or decomposition products, the equipment typically needs to be shut down for maintenance. This process is inherently cumbersome and time-consuming, and can severely impact normal operation in areas where the equipment is powered, particularly at major conferences or events.

[0003] At present, there are devices for online processing of insulating gas in electrical equipment. They use the changes in gas pressure in the processing device as the control basis to control valve groups, power devices, etc., to drive the gas to circulate "breathing" between the electrical equipment and the processing device, thereby realizing online processing of substandard insulating gas in the electrical equipment.

[0004] However, due to the existence of gas pressure fluctuations, the gas flow rate is easily unstable, resulting in low automatic control accuracy of the above-mentioned online processing device, which in turn causes the entire online processing process to have a long cycle and low efficiency. Summary of the Invention

[0005] Embodiments of the present invention provide an online processing system and method for insulating gas of electrical equipment, so as to improve control accuracy and processing efficiency based on mass flow and gas quality.

[0006] In a first aspect, an embodiment of the present invention provides an online insulating gas treatment system for electrical equipment, comprising:

[0007] A mass flow detection device, a first purification device and a gas driving device are arranged on the main processing loop;

[0008] a gas detection device provided on a detection bypass circuit parallel to the main processing loop;

[0009] a control device connected to the mass flow detection device, the gas driving device and the gas detection device respectively;

[0010] The mass flow detection device is used to detect the mass ∑m of the gas to be processed that is accumulated and recovered from the electrical equipment to the processing system. 回 The quality of the insulating gas that meets the standards and is returned to the electrical equipment from the processing system is ∑m 回充 ;

[0011] The first purification device is used to purify the gas to be treated;

[0012] The gas driving device is used to drive the gas to be treated to pass through the first purification device, and to drive the qualified insulating gas to be recharged into the electrical equipment;

[0013] The gas detection device is used to perform real-time detection of the gas in the main processing loop before and after purification;

[0014] The control device is used to obtain the real-time gas quality according to the real-time detection data of the gas detection device, and control the operation of the gas driving device according to the real-time gas quality, and 回收 -∑m 回充 |Recharge stops when the quality is less than or equal to the preset threshold.

[0015] Optionally, the gas driving device has a variable frequency adjustment function, and the real-time detection data includes at least purity, humidity and decomposition product concentration;

[0016] The control device is used to obtain the real-time gas quality according to the purity, humidity and decomposition product concentration, and dynamically adjust the operating frequency of the gas driving device according to the real-time gas quality to adjust the gas processing time of the purification device.

[0017] Furthermore, the processing system further comprises: a first connecting pipeline;

[0018] One end of the first connecting pipeline is connected to the first recovery / recharge port of the electrical device, a first control valve is provided on the first connecting pipeline near the first recovery / recharge port, and the other end of the first connecting pipeline intersects with the main processing loop at a first connection point;

[0019] Correspondingly, with the first connection point as the starting point, along the gas circulation direction of the main processing loop, the mass flow detection device, the first purification device and the gas driving device are sequentially arranged in series;

[0020] The detection bypass is arranged in parallel on the main processing loop after the first connection point and before the mass flow detection device, so as to perform bypass sampling detection on the gas before it flows into the mass flow detection device;

[0021] A third control valve is provided before the air inlet end of the first purification device;

[0022] A fourth control valve is provided on the main processing loop from the gas driving device to the first connection point along the gas circulation direction.

[0023] Furthermore, the electrical device has only one recovery / recharge port, and the processing system further comprises: a second connecting pipeline;

[0024] A fifth control valve is provided on the second connecting pipeline;

[0025] The air inlet end of the second connecting pipeline intersects with the main processing loop at a second connection point after the mass flow detection device and before the third control valve;

[0026] The gas outlet end of the second connecting pipeline intersects with the first connecting pipeline at a third connecting point after the first control valve and before the first connecting point;

[0027] A second control valve is further provided between the third connection point and the first connection point on the first connection pipeline.

[0028] Furthermore, the electrical device includes a plurality of recovery / recharge ports, and the processing system further includes: a second connecting pipeline;

[0029] A fifth control valve is provided on the second connecting pipeline;

[0030] The air inlet end of the second connecting pipeline intersects with the main processing loop at a second connection point after the mass flow detection device and before the third control valve;

[0031] The gas outlet end of the second connecting pipeline is connected to any other recovery / recharge port on the electrical device except the first recovery / recharge port.

[0032] Furthermore, the gas driving device is a variable frequency air compressor, and a second purification device is provided after the variable frequency air compressor;

[0033] Accordingly, the first purification device is used to perform preliminary adsorption on the gas to be treated to obtain an intermediate treated gas;

[0034] The variable frequency air compressor is used to pressurize the intermediate processed gas and then send it to the second purification device;

[0035] The second purification device is used to perform high-pressure deep adsorption on the pressurized intermediate processing gas.

[0036] Furthermore, the main processing loop is further provided with a first flow regulating device and a second flow regulating device, which are respectively connected to the control device;

[0037] The first purification device, the first flow regulating device, the variable frequency air compressor, and the second flow regulating device are sequentially arranged in series along the gas circulation direction of the main processing loop;

[0038] Accordingly, the control device is further configured to adjust the first gas processing time of the first purification device and the air intake flow rate of the variable frequency air compressor according to the real-time gas quality, in combination with Darcy's law and the first gas volume of the first purification device;

[0039] The control device is further configured to adjust the second gas processing time of the second purification device and the gas outlet flow rate of the second purification device according to the real-time gas quality, in combination with Darcy's law and the second gas volume of the second purification device.

[0040] Furthermore, the processing system further includes: a vacuum pumping device connected to the control device, for performing a vacuum pumping operation on the processing system before recovering the gas to be processed according to the control of the control device.

[0041] Furthermore, the processing system further includes: a gas replenishing device connected to the control device, for replenishing standard insulating gas to the processing system according to the control of the control device.

[0042] In a second aspect, an embodiment of the present invention provides an online treatment method for insulating gas in electrical equipment, which is applied to the online treatment system for insulating gas in electrical equipment described in the first aspect of the embodiment of the present invention, comprising:

[0043] Obtain the cumulative mass ∑m of the gas to be treated that is recovered from the electrical equipment to the treatment system 回 The quality of the insulating gas that meets the standards and is returned to the electrical equipment from the processing system is accumulated ∑m 回充 , and real-time detection data of the gas detection device;

[0044] According to the real-time detection data, the real-time gas quality is obtained, and the operation of the gas driving device is controlled according to the real-time gas quality, and in |∑m 回收 -∑m 回充 |Recharge stops when the quality is less than or equal to the preset threshold.

[0045] The embodiment of the present invention realizes online processing of insulating gas in electrical equipment by setting up a dual-path structure of a main processing loop and a detection bypass, without stopping the operation of the electrical equipment, and significantly improves the power supply reliability of the power system; a mass flow detection device is used to directly measure the mass flow of the gas, and combined with a precise flow regulation device, precise control of the gas flow rate during the treatment process is achieved, overcoming the problem of insufficient pressure control accuracy in the prior art; by setting up an independent detection bypass and a gas detection device, real-time and accurate monitoring of the gas quality during the treatment process is achieved, avoiding the influence of main path airflow disturbance on the detection accuracy; the gas detection device is linked with the control device to form an automatic adjustment mechanism based on gas quality, realizing intelligent adjustment of the processing parameters; a modular design is adopted, the structure is simple, easy to implement and maintain, the system cost is reduced, and it is conducive to large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic structural diagram of an online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention;

[0047] Figure 2 This is a structural diagram of another online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention;

[0048] Figure 3 This is a structural diagram of another online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention;

[0049] Figure 4 This is a structural diagram of another online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention;

[0050] Figure 5 This is a structural diagram of another online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention;

[0051] Figure 6 This is a structural diagram of another online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention;

[0052] Figure 7 This is a structural diagram of another online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention;

[0053] Figure 8 This is a structural example diagram of an online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention;

[0054] Figure 9 The present invention provides a flowchart of an online method for treating insulating gas in electrical equipment. DETAILED DESCRIPTION

[0055] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. Furthermore, the embodiments and features of the embodiments of the present invention may be combined with one another unless there is a conflict. It should also be noted that, for ease of description, the drawings only illustrate portions relevant to the present invention, not all of the components.

[0056] Figure 1 This is a schematic diagram of the structure of an online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention. Figure 1 As shown, the treatment system includes: a mass flow detection device 101, a first purification device 102 and a gas drive device 103 arranged on the main treatment loop; a gas detection device 104 arranged on a detection bypass parallel to the main treatment loop; and a control device 105 respectively connected to the mass flow detection device 101, the gas drive device 103 and the gas detection device 104.

[0057] The mass flow detection device 101 is used to detect the mass of the gas to be processed that is recovered from the electrical equipment to the processing system. 回 The quality of the insulating gas collected and returned to the electrical equipment from the treatment system is ∑m 回充 .

[0058] Optionally, the mass flow detection device 101 may be a mass flow meter or a mass flow controller.

[0059] In one embodiment, the mass flow detection device 101 uses a high-precision mass flow meter with a measurement accuracy of up to ±0.5%, which can monitor the gas flow in real time and transmit the data to the control device.

[0060] It is understood that the mass flow detection device 101 can use a mass flow meter based on the principle of a thermal mass flow meter to directly measure the mass flow of the gas, which is not affected by changes in temperature and pressure, thereby ensuring the accuracy of the measurement results. The measurement data of the mass flow meter is transmitted to the control device in real time to achieve closed-loop control of the mass flow of recovery and refilling. This closed-loop control method ensures the balance of gas quality during the recovery and refilling process, avoiding the problems of gas loss or excessive refilling.

[0061] The first purification device 102 is used to purify the gas to be processed.

[0062] Optionally, the first purification device 102 is filled with adsorption materials such as molecular sieves and activated carbon, which can effectively remove moisture, impurities and decomposition products in the insulating gas.

[0063] Optionally, the first purification device 102 has an operating pressure range of 0.1 MPa to 1.0 MPa and an operating temperature range of -10°C to 60°C.

[0064] The gas driving device 103 is used to drive the gas to be treated to pass through the first purification device 102, and to drive the insulating gas that meets the standards to be recharged into the electrical equipment.

[0065] Optionally, the gas driving device 103 may be a compressor or a circulation pump.

[0066] In one embodiment, the gas driving device 103 uses an oil-free compressor with a rated power of 1.5 kW, a maximum exhaust pressure of 1.0 MPa, and an exhaust volume of 60 L / min.

[0067] The gas detection device 104 is used to perform real-time detection of the gas in the main processing loop before and after purification.

[0068] Optionally, the gas detection device 104 includes a gas purity detector, a humidity sensor and a decomposition product detector, which can monitor the purity, humidity and decomposition product concentration of the gas before and after purification in the main processing loop in real time.

[0069] In one embodiment, the measurement range of the gas purity analyzer is 80% to 99.999%, the measurement range of the humidity sensor is 0 to 1000 ppm, and the decomposition product detector can detect common decomposition products such as SO2, HF, and SF4 with a detection limit of 0.1 ppm.

[0070] Optionally, the gas detection device 104 employs an integrated gas analyzer capable of real-time detection of gas purity, moisture, and decomposition product concentration. The gas analyzer utilizes a combination of multiple detection technologies, including infrared spectroscopy, electrochemical sensing, and dew point measurement, to comprehensively detect moisture, decomposition products, and other impurities in the gas.

[0071] It can be understood that by arranging the gas detection device 104 on a detection bypass circuit parallel to the main processing loop to independently detect gas quality, the influence of the airflow disturbance of the main processing loop on the detection accuracy is avoided.

[0072] The control device 105 is used to obtain the real-time gas quality according to the real-time detection data of the gas detection device 104, and control the operation of the gas driving device 103 according to the real-time gas quality, and 回收 -∑m 回充 |Recharge stops when the quality is less than or equal to the preset threshold.

[0073] Optionally, the control device 105 utilizes an industrial-grade programmable controller with multiple input and output interfaces capable of receiving signals from various sensors and controlling the actions of various actuators. The control device 105 includes a built-in algorithm that automatically adjusts the opening of the flow control device based on gas quality data to optimize the purification effect.

[0074] The preset quality threshold can be set according to the volume and working pressure of the electrical equipment.

[0075] In one embodiment, the preset quality threshold is set to 0.5% to 2% of the rated air volume of the electrical equipment.

[0076] It is understandable that |∑m 回收 -∑m 回充 |When it is less than or equal to the preset quality threshold, it indicates that the quality of the qualified insulating gas that is cumulatively refilled into the electrical equipment is basically consistent with the quality of the gas to be treated that is cumulatively recovered from the electrical equipment to the treatment system, and the requirements of the electrical equipment for the insulating gas filling volume can be met. Traditional technical solutions are often based on pressure balance (i.e. maintaining the consistency of the pressure of the electrical equipment before recovery and after refilling) as the refill termination condition. However, due to the instability of the gas pressure, fluctuations are more likely to occur during control, thereby affecting the accuracy of automatic control. The embodiment of the present invention adopts mass balance as the refill termination condition. Since mass is an absolute quantity, the method based on mass balance in the embodiment of the present invention is easier to control than the traditional method based on pressure balance, thereby achieving higher automatic control accuracy.

[0077] It should be noted that since the treatment system does not have a dedicated gas storage device, and the total volume of the gas to be treated in the electrical equipment may be greater than the capacity of the treatment system pipeline, the treatment system may need to be processed multiple times to purify all the gas to be treated. 回收 and ∑m 回充 can be expressed as the cumulative recycling mass when the processing system completes one recycling and the cumulative recharging mass when the system completes one recharging. In another control method, ∑m 回收 and ∑m 回充 It can respectively represent the total mass of the gas to be treated recovered from the electrical equipment by the treatment system from the first treatment to the last treatment, and the total mass of the qualified insulating gas refilled into the electrical equipment.

[0078] Furthermore, the gas driving device 103 has a variable frequency adjustment function, and the real-time detection data includes at least purity, humidity and decomposition product concentration.

[0079] The control device 105 is used to obtain the real-time gas quality according to the purity, humidity and decomposition product concentration, and dynamically adjust the operating frequency of the gas driving device 103 according to the real-time gas quality to adjust the gas processing time of the purification device.

[0080] Optionally, when it is detected that the gas quality exceeds the standard, the control device 105 will reduce the operating frequency of the gas drive device 103, reduce the gas flow rate, and extend the processing time; when it is detected that the gas quality meets the standard, the control device 105 will increase the operating frequency of the gas drive device 103, increase the gas flow rate, and improve the processing efficiency.

[0081] In one embodiment, the real-time gas quality q is determined according to the following formula:

[0082]

[0083] Among them, ω D is the weight of the decomposition product concentration, ω H is the humidity weight, ω P is the purity weight, and ω D >ω H >ω p ;c D is the measured decomposition product concentration, c D_std is the preset standard decomposition product concentration; Measured humidity, It is the preset standard humidity; Measured purity, The purity is preset as standard.

[0084] It should be noted that there may be multiple decomposition products of insulating gas. For example, the decomposition products of SF6 may include SO2, HF, SOF4, etc. Therefore, the decomposition products can be classified according to the type of decomposition products. D Further refine the configuration (for example, configure it as ω D1 、ω D2 、ω D3 , ..., etc.). In addition, the above weight distribution method is only an optional embodiment, and this application does not limit the weight distribution method.

[0085] It's understandable that real-time gas quality (q) is a comprehensive indicator that reflects the overall quality of the insulating gas. A larger q value indicates poorer gas quality; a smaller q value indicates better gas quality. The q value calculation takes into account three factors: decomposition product concentration, humidity, and purity. These factors are weighted according to their impact on the safe operation of electrical equipment. Considering that decomposition product concentration directly affects equipment insulation performance and requires the fastest response, while humidity changes more slowly and purity typically changes less during a cycle, the order of priority can be set as follows: decomposition product concentration > humidity > purity, with weights assigned accordingly.

[0086] In one embodiment, after obtaining the real-time gas quality q, the method further includes calculating a deviation Δq between q and a preset standard gas quality qstd; and determining whether q meets or exceeds the standard based on Δq. Optionally, when Δq > 0, q is determined to exceed the standard; and when Δq ≤ 0, q is determined to meet the standard.

[0087] In one embodiment, the operating frequency of the gas driving device 103 is adjusted in a range of 20 Hz to 60 Hz, and the corresponding gas flow rate range is 20 L / min to 60 L / min.

[0088] The embodiment of the present invention realizes online processing of insulating gas in electrical equipment by setting up a dual-path structure of a main processing loop and a detection bypass, without stopping the operation of the electrical equipment, and significantly improves the power supply reliability of the power system; a mass flow detection device is used to directly measure the mass flow of the gas, and combined with a precise flow regulation device, precise control of the gas flow rate during the treatment process is achieved, overcoming the problem of insufficient pressure control accuracy in the prior art; by setting up an independent detection bypass and a gas detection device, real-time and accurate monitoring of the gas quality during the treatment process is achieved, avoiding the influence of main path airflow disturbance on the detection accuracy; the gas detection device is linked with the control device to form an automatic adjustment mechanism based on gas quality, realizing intelligent adjustment of the processing parameters; a modular design is adopted, the structure is simple, easy to implement and maintain, the system cost is reduced, and it is conducive to large-scale promotion and application.

[0089] Figure 2 This is a schematic diagram of the structure of another online insulating gas treatment system and method for electrical equipment provided by an embodiment of the present invention. This embodiment optimizes and adds a first connecting pipeline based on the previous embodiment. One end of the first connecting pipeline is connected to the first recovery / recharge port 206 of the electrical equipment. A first control valve 207 is provided on the first connecting pipeline near the first recovery / recharge port 206. The other end of the first connecting pipeline intersects with the main treatment loop at a first connection point.

[0090] Correspondingly, starting from the first connection point, along the gas circulation direction of the main processing loop, the mass flow detection device 201, the first purification device 202 and the gas driving device 203 are sequentially arranged in series.

[0091] In one embodiment, the mass flow detection device 201 is installed downstream of the first connection point, the first purification device 202 is installed downstream of the mass flow detection device 201, and the gas drive device 203 is installed downstream of the first purification device 202. The devices are connected by standard flanges to ensure the sealing and reliability of the system.

[0092] Optionally, a detection bypass is provided in parallel on the main processing loop after the first connection point and before the mass flow detection device 201 , so as to perform bypass sampling detection on the gas before it flows into the mass flow detection device 201 .

[0093] In one embodiment, the diameter of the detection bypass pipe is 6 mm, and it is made of stainless steel and can withstand a working pressure of 1.6 MPa.

[0094] Furthermore, a third control valve 208 is provided before the air inlet end of the first purification device 202 .

[0095] It is understandable that the third control valve 208 can be used to control the flow of gas entering the first purification device 202. When entering the refilling stage or the purification device needs to be maintained / replaced, the third control valve 208 can be closed to isolate the purification device.

[0096] Furthermore, along the gas circulation direction, a fourth control valve 209 is provided on the main processing loop from the gas driving device 203 to the first connection point.

[0097] The fourth control valve 209 is used to control the flow of the treated gas back into the electrical equipment. When the backfilling needs to be stopped, the fourth control valve 209 can be closed.

[0098] Furthermore, a sixth control valve 210 and a seventh control valve 211 are respectively provided before and after the gas detection device 204 on the detection bypass.

[0099] In one embodiment, the sixth control valve 210 and the seventh control valve 211 are both precision regulating valves with a rated working pressure of 1.6 MPa, a diameter of 6 mm, and a switching time of less than 0.2 seconds.

[0100] It is understood that the detection bypass is used to isolate pressure fluctuations in the main processing loop, thereby providing a stable pressure detection environment for the gas detection device 204. By adjusting the opening of the sixth control valve 210 and the seventh control valve 211, the gas flow entering the gas detection device 204 can be controlled to ensure detection accuracy.

[0101] Furthermore, for electrical equipment having only one recovery / recharge port, the processing system further includes: a second connecting pipeline;

[0102] A fifth control valve 212 is provided on the second connecting pipeline;

[0103] The inlet end of the second connecting pipeline intersects with the main processing loop at a second connection point after the mass flow detection device 201 and before the third control valve 208;

[0104] The gas outlet end of the second connecting pipeline intersects with the first connecting pipeline at a third connecting point after the first control valve 207 and before the first connecting point;

[0105] A second control valve 213 is further provided between the third connection point and the first connection point on the first connection pipeline.

[0106] It can be understood that for electrical equipment with only one recovery / recharge port, by connecting the second connecting pipe serving as the recharge pipe to the first connecting pipe, part of the first connecting pipe is reused as the recharge pipe connected to the first recovery / recharge port, thereby achieving the recharge of qualified insulating gas to the electrical equipment.

[0107] Figure 3 This is a structural diagram of another on-line treatment system for insulating gas of electrical equipment provided by an embodiment of the present invention. Figure 2 Based on the embodiment shown, the second connecting line is improved for an electrical device having multiple recovery / recharging ports.

[0108] like Figure 3 As shown, a fifth control valve 312 is provided on the second connecting pipeline;

[0109] The air inlet end of the second connecting pipeline intersects with the main processing loop at a second connection point after the mass flow detection device 301 and before the third control valve 308;

[0110] The outlet end of the second connecting pipeline is connected to any other recycling / recharging port ( Figure 3 (taking the second recycling / recharging port 313 as an example).

[0111] It can be understood that for electrical equipment with multiple recovery / recharge ports, the qualified insulating gas can be recharged into the electrical equipment by directly connecting the second connecting pipe serving as the recharge pipe to any other recovery / recharge port except the first recovery / recharge port.

[0112] Figure 4 and Figure 5 They are respectively structural schematic diagrams of another online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention. Figure 4 and Figure 5 respectively Figure 2 and Figure 3 The embodiment shown is further optimized in that the gas driving device is concretized as a variable frequency air compressor, and a second purification device is further optimized and added after the variable frequency air compressor; accordingly, the first purification device is used to perform preliminary adsorption on the gas to be treated to obtain an intermediate treated gas; the variable frequency air compressor is used to pressurize the intermediate treated gas and send it to the second purification device; the second purification device is used to perform high-pressure deep adsorption on the pressurized intermediate treated gas.

[0113] Furthermore, the main processing loop is optimized and additionally provided with a first flow regulating device and a second flow regulating device, which are respectively connected to the control device; the first purification device, the first flow regulating device, the variable frequency air compressor, and the second flow regulating device are sequentially arranged in series along the gas circulation direction of the main processing loop; accordingly, the control device is also used to adjust the first gas processing time of the first purification device and the air intake flow of the variable frequency air compressor according to the real-time gas quality, combined with Darcy's law and the first gas volume of the first purification device; the control device is also used to adjust the second gas processing time of the second purification device and the air outlet flow of the second purification device according to the real-time gas quality, combined with Darcy's law and the second gas volume of the second purification device.

[0114] Optionally, both the first flow regulating device and the second flow regulating device adopt electromagnetic proportional regulating valves.

[0115] In one embodiment, the first purification device and the second purification device respectively use a first filter and a second filter. The first filter is mainly used to remove particulate impurities and preliminary hydrolysis products in the gas. Its filtration accuracy is 5μm, which can effectively intercept solid particles and large molecular pollutants in the gas. The first filter adopts a multi-layer structure design, with the outer layer being a stainless steel filter mesh, the middle layer being activated carbon, and the inner layer being a specially treated fiber material. This structural design ensures the filtration effect without causing excessive airflow resistance. The second filter is used to deeply adsorb moisture and decomposition products in the gas, and the molecular sieve filled inside has a pore size of Specially designed for water molecules, the adsorption capacity is 20% of its own weight. In addition, the second filter is added with a special chemical adsorbent that can selectively adsorb SF6 decomposition products such as SO2, SOF2, SO2F2, HF and other harmful substances.

[0116] like Figure 4As shown, the online insulating gas treatment system for electrical equipment is suitable for electrical equipment with only one recovery / recharge port, including: a mass flow detection device 401, a first purification device 402, a variable frequency air compressor 403, a gas detection device 404, a control device 405, a first recovery / recharge port 406, a first control valve 407, a third control valve 408, a fourth control valve 409, a sixth control valve 410, a seventh control valve 411, a fifth control valve 412, a second control valve 413, a second purification device 414, a first flow regulating device 415, and a second flow regulating device 416.

[0117] like Figure 5 As shown, the online treatment system for insulating gas of electrical equipment is suitable for electrical equipment with multiple recovery / recharge ports, including: a mass flow detection device 501, a first purification device 502, a variable frequency air compressor 503, a gas detection device 504, a control device 505, a first recovery / recharge port 506, a first control valve 507, a third control valve 508, a fourth control valve 509, a sixth control valve 510, a seventh control valve 511, a fifth control valve 512, a second recovery / recharge port 513, a second purification device 514, a first flow regulating device 515, and a second flow regulating device 516.

[0118] Optionally, taking the adjustment of the first flow regulating device as an example, the control strategy of the control device is as shown in the following steps S1 to S3:

[0119] S1. Controlling the first flow regulating device to regulate the pressure at the gas outlet of the first purification device according to the real-time gas quality.

[0120] In one embodiment, when it is detected that the gas purity is lower than 98% and / or the gas humidity is higher than 50 ppm and / or the decomposition product concentration is higher than 1 ppm, the control device will reduce the pressure at the gas outlet of the purification device, extend the processing time of the gas in the purification device, and increase the contact time between the gas and the adsorption material.

[0121] S2. According to the adjusted pressure at the gas outlet of the first purification device and in combination with Darcy's law, the flow rate of the gas flowing through the first purification device is adjusted.

[0122] As you can understand, Darcy's law describes the flow of fluids in porous media, expressed as Q = KA(P1-P2) / μL, where Q is the flow rate, K is the permeability coefficient, A is the cross-sectional area, P1-P2 is the pressure difference, μ is the fluid viscosity, and L is the flow path length. By controlling the pressure difference across the first purification device, the gas flow rate can be precisely adjusted.

[0123] S3. Adjusting the gas processing time of the purification device according to the adjusted flow rate of the gas flowing through the first purification device and the gas volume of the first purification device.

[0124] The gas treatment time is equal to the effective volume of the first purification device divided by the gas flow rate. By adjusting the gas flow rate, you can control the time the gas stays in the first purification device, thereby affecting the purification effect. When the gas quality is poor, increase the treatment time; when the gas quality is good, reduce the treatment time to improve treatment efficiency.

[0125] It is understandable that the control strategy of the control device for the second flow regulating device can refer to the control strategy for the first flow regulating device, which will not be repeated here.

[0126] Figure 6 and Figure 7 They are respectively structural schematic diagrams of another online insulating gas treatment system for electrical equipment provided by an embodiment of the present invention. Figure 6 and Figure 7 respectively Figure 2 and Figure 3 The embodiment shown is further optimized by adding a vacuum pumping device, which is connected to the control device and is used to perform a vacuum operation on the processing system before recovering the gas to be processed according to the control of the control device.

[0127] Furthermore, the processing system is optimized and further includes a gas replenishing device connected to the control device for replenishing standard insulating gas to the processing system according to the control of the control device.

[0128] Optionally, the vacuum pumping device is connected to the main processing loop, and an eighth control valve is provided on the connecting pipeline.

[0129] Optionally, the air supply device is connected to the main processing loop, and a ninth control valve is provided on the connecting pipeline.

[0130] In one embodiment, the vacuum pumping device adopts a rotary vane vacuum pump with a limit vacuum degree of 1 Pa and a pumping rate of 20 L / s.

[0131] It is understandable that before the treatment system is put into use or after maintenance, it is necessary to first evacuate the system with a vacuum device to remove air and moisture in the system to avoid contamination of the insulating gas.

[0132] Optionally, the air supply device is further used to: when the number of cycles of the first purification device reaches a preset number of cycles, and ∑m 回收 -∑m 回充 When the quality is greater than a preset threshold, the processing system is supplemented with standard insulating gas according to the control of the control device.

[0133] In one embodiment, the gas supply device includes a standard insulating gas cylinder and a pressure reducing valve. The purity of the standard insulating gas is not less than 99.999%, and the output pressure range of the pressure reducing valve is 0.1 MPa to 0.5 MPa.

[0134] In one embodiment, the preset number of cycles is set to 10 to 20 times, which can be adjusted according to the volume and working pressure of the electrical equipment.

[0135] like Figure 6 As shown, the online insulating gas treatment system for electrical equipment is suitable for electrical equipment with only one recovery / recharge port, including: a mass flow detection device 601, a first purification device 602, a variable frequency air compressor 603, a gas detection device 604, a control device 605, a first recovery / recharge port 606, a first control valve 607, a third control valve 608, a fourth control valve 609, a sixth control valve 610, a seventh control valve 611, a fifth control valve 612, a second control valve 613, a vacuum pumping device 614, an eighth control valve 615, an air supply device 616 and a ninth control valve 617.

[0136] like Figure 7 As shown, the online treatment system for insulating gas of electrical equipment is suitable for electrical equipment with only one recovery / recharge port, including: a mass flow detection device 701, a first purification device 702, a variable frequency air compressor 703, a gas detection device 704, a control device 705, a first recovery / recharge port 706, a first control valve 707, a third control valve 708, a fourth control valve 709, a sixth control valve 710, a seventh control valve 711, a fifth control valve 712, a second recovery / recharge port 713, a vacuum pumping device 714, an eighth control valve 715, an air supply device 716 and a ninth control valve 717.

[0137] It should be noted that the embodiment of the present invention does not limit the connection point locations of the vacuum pumping device and the air supply device to the main processing loop. Figure 6 and Figure 7 Only one connection example is shown.

[0138] For example, Figure 8 A structural example diagram of an online treatment system for insulating gas of electrical equipment is provided. The treatment system is suitable for electrical equipment with only one recovery / recharge port, including: a mass flow detection device 801, a first purification device 802, a variable frequency air compressor 803, a gas detection device 804, a control device 805, a first recovery / recharge port 806, a first control valve 807, a third control valve 808, a fourth control valve 809, a sixth control valve 810, a seventh control valve 811, a fifth control valve 812, a second control valve 813, a second purification device 814, a first flow regulating device 815, a second flow regulating device 816, a vacuum pumping device 817, an eighth control valve 818, an air supply device 819 and a ninth control valve 820.

[0139] Figure 8 The working process of the online insulating gas treatment system for electrical equipment is as follows:

[0140] Step 1: System initialization

[0141] The control device 805 controls the first control valve 807 and the ninth control valve 820 to close, and controls the other control valves to open, and controls the vacuum device 817 to vacuum the processing system to ensure that there is no air residue in the processing system. The vacuum operation continues until the pressure in the processing system reaches a preset vacuum level, usually below 0.1 Pa. After the vacuuming is completed, the vacuum device 817 and the eighth control valve 818 are controlled to close, the ninth control valve 820 is opened, and the air supply device 819 is controlled to replenish standard insulating gas to the processing system until the pressure difference between the electrical equipment and the processing system is less than or equal to the preset threshold. The preset threshold is usually set to 5kPa to ensure that when the connecting valve is opened, there will be no airflow shock due to excessive pressure difference. The pressure difference detection is completed by the pressure sensors installed on the electrical equipment and the processing system. When it is detected that the pressure difference is less than or equal to the preset threshold, the air supply device 819 and the ninth control valve 820 are closed, and the system enters the standby state.

[0142] Step 2: Gas Recovery

[0143] The control device 805 opens the first control valve 807, closes the fifth control valve 812, and starts the variable frequency air compressor 803 as a power source, so that the gas to be treated in the electrical equipment enters the main treatment loop through the first connecting pipeline. The mass flow detection device 801 simultaneously monitors the cumulative mass of the gas to be treated ∑m 回 receive.

[0144] Step 3: Gas Detection

[0145] After the gas to be processed enters the main processing loop, a portion of it passes through a bypass path and enters the gas detection device 804 for real-time testing, acquiring parameters such as gas purity, humidity, and decomposition product concentrations. Using infrared spectroscopy, gas detection device 804 can simultaneously detect gas purity, humidity, and decomposition product concentrations (such as SO2 and HF). This real-time detection data is transmitted to the control device 805.

[0146] Step 4: Mass flow monitoring

[0147] The mainstream gas passes through mass flow detection device 801, which uses the principle of a thermal mass flowmeter to monitor the cumulative mass of recovered gas to be processed (∑mrecovery) in real time. Mass flow detection device 801 has a measurement accuracy of ±0.5% and a measurement range of 0-100 kg / h, meeting the gas processing needs of electrical equipment of various sizes.

[0148] Step 5: Gas purification

[0149] The control device 805 controls the opening of the third control valve 808, allowing the gas to flow through the first purification device 802 for preliminary adsorption treatment. The first purification device 802 is filled with adsorption materials such as molecular sieves and activated alumina, which remove some impurities and moisture, producing intermediate treated gas. After passing through the first flow control device 802, the intermediate treated gas enters the variable frequency air compressor 803, which pressurizes the gas to 0.6-0.8 MPa before sending it to the second purification device 814. The second purification device 814 is filled with high-efficiency activated carbon and special molecular sieves, which perform deep adsorption treatment on the gas under high pressure, further removing impurities and moisture, and producing standard-compliant insulating gas.

[0150] Step 6: Dynamic adjustment of processing parameters

[0151] Based on the real-time detection data provided by the gas detection device 804, the control device 805 calculates the real-time gas quality and dynamically adjusts the operating frequency of the variable frequency air compressor 803 (usually within the range of 30-60Hz), as well as the opening of the first flow control device 815 and the second flow control device 816 (usually within the range of 20%-100%). The control device 805 uses a PID control algorithm, combined with Darcy's law and the gas volume of the two purification devices (the first purification device 802 has a volume of approximately 10L, and the second purification device 814 has a volume of approximately 15L), to accurately control the gas flow rate (usually within the range of 5-50kg / h) and the treatment time (usually within the range of 0.5-5 minutes) to ensure the treatment effect.

[0152] Step 7: Gas refill inspection

[0153] The control device 805 controls the fourth control valve 809 to open and the first control valve 807, the second control valve 813, and the third control valve 808 to close. The gas treated by the second purification device 814 is regulated in flow rate by the second flow regulating device 816 and flows back to the first connection point. Some of the gas then enters the gas detection device 804 through the detection bypass. The control device 805 obtains real-time gas quality based on the real-time detection data of the gas detection device 804 and determines whether the quality of the gas treated by the second purification device 814 meets the standard. If it does, the fifth control valve 812 and the first control valve 807 are controlled to open, entering the gas refill phase. If it exceeds the standard, the third control valve 808 is controlled to open, and the treatment system continues to circulate and purify until the gas quality meets the standard.

[0154] Step 8: Gas refill

[0155] The qualified insulating gas is recharged to the electrical equipment through the second connecting pipeline, the second connecting point, the first connecting pipeline and the first recovery / recharge port 806. During the recharge process, the mass flow detection device simultaneously monitors the cumulative quality of the recharged qualified insulating gas ∑m 回充.

[0156] Step 9: Determine when recharge is terminated

[0157] The control device 805 calculates |∑m in real time 回收 -∑m 回充 |, and compared with the preset quality threshold (for example, set to ∑m 回收 0.5% of) for comparison. When |∑m 回收 -∑m 回充 | is less than or equal to the preset quality threshold, the control device 805 determines that the quality of the recovered and recharged gas is basically balanced, and at this time controls all control valves and the variable frequency air compressor 803 to close and stop the recharge process; when ∑m 回收 -∑m 回充 When the quality is greater than the preset threshold, it indicates that the gas purification loss is large and / or there is a gas leak. The control device 805 controls the gas supply device 819 and the ninth control valve 820 to open, and replenishes the standard insulating gas to the processing system until |∑m 回收 -∑m 回充 |Less than or equal to the preset quality threshold.

[0158] In practical applications, this method can be appropriately adjusted based on the characteristics and requirements of different types of electrical equipment. For example, for large GIS equipment, the processing system's processing capacity can be increased to improve gas flow. For equipment with high gas purity requirements, the number of filter stages can be increased or more efficient adsorption materials can be replaced. Furthermore, the system can automatically adjust processing parameters, such as compressor speed and filter operating temperature, based on gas analysis results to optimize treatment results.

[0159] The online insulating gas treatment method for electrical equipment in this embodiment achieves efficient purification and precise recharging of insulating gas by real-time monitoring of gas quality and dynamically adjusting treatment parameters. This method is particularly suitable for online treatment of insulating gas in electrical equipment such as large power transformers, circuit breakers, and gas-insulated switchgear. It can complete gas treatment without power outages or equipment disassembly, significantly improving the operational reliability and maintenance efficiency of electrical equipment.

[0160] Figure 9 FIG. 1 is a flow chart of an online treatment method for insulating gas of an electrical device provided by an embodiment of the present invention. Figure 9 As shown, the method includes:

[0161] S901. Obtain the cumulative mass ∑m of the gas to be processed that is recovered from the electrical equipment to the processing system. 回收 The quality of the insulating gas that meets the standards and is returned to the electrical equipment from the processing system is ∑m 回充 , and real-time detection data of the gas detection device;

[0162] S902, obtain the real-time gas quality according to the real-time detection data, and control the operation of the gas driving device according to the real-time gas quality, and 回收 -∑m 回充 |Recharge stops when the quality is less than or equal to the preset threshold.

[0163] Optionally, obtaining the real-time gas quality according to the real-time detection data includes: determining the real-time gas quality q according to the following formula:

[0164]

[0165] Among them, ω D is the weight of the decomposition product concentration, ω H is the humidity weight, ω P is the purity weight, and ω D >ω H >ω P ;c D is the measured decomposition product concentration, c D_std is the preset standard decomposition product concentration; Measured humidity, It is the preset standard humidity; Measured purity, The purity is preset as standard.

[0166] Optionally, controlling the operation of the gas driving device according to the real-time gas quality includes the following steps S9021 to S9024:

[0167] S9021. Calculate the q and the preset standard gas quality q std The deviation value Δq.

[0168] S9022: Determine whether q meets or exceeds the standard based on Δq.

[0169] S9023. When it is detected that the gas quality exceeds the standard, reduce the operating frequency of the gas drive device to reduce the gas flow rate and extend the processing time.

[0170] S9024. When it is detected that the gas quality meets the standard, the operating frequency of the gas drive device is increased to increase the gas flow rate and improve the processing efficiency.

[0171] The online insulating gas treatment method for electrical equipment provided by the present invention ensures gas quality balance during the recovery and refilling processes through closed-loop mass flow control, thereby improving treatment efficiency and gas utilization. Furthermore, the method features simple operation, a high degree of automation, and excellent treatment results, making it suitable for the maintenance and servicing of various electrical equipment using insulating gas.

[0172] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An online treatment system for insulating gas of electrical equipment, characterized in that: include: A mass flow detection device, a first purification device and a gas driving device are arranged on the main processing loop; a gas detection device provided on a detection bypass circuit parallel to the main processing loop; a control device connected to the mass flow detection device, the gas driving device and the gas detection device respectively; The mass flow detection device is used to detect the mass ∑m of the gas to be processed that is accumulated and recovered from the electrical equipment to the processing system. 回 The quality of the insulating gas that meets the standards and is returned to the electrical equipment from the processing system is ∑m 回充 ; The first purification device is used to purify the gas to be treated; The gas driving device is used to drive the gas to be treated to pass through the first purification device, and to drive the qualified insulating gas to be recharged into the electrical equipment; The gas detection device is used to perform real-time detection of the gas in the main processing loop before and after purification; The control device is used to obtain the real-time gas quality according to the real-time detection data of the gas detection device, and control the operation of the gas driving device according to the real-time gas quality, and 回收 -∑m 回充 |Recharge stops when the quality is less than or equal to the preset threshold.

2. The online insulating gas treatment system for electrical equipment according to claim 1, characterized in that: The gas driving device has a variable frequency adjustment function, and the real-time detection data includes at least purity, humidity and decomposition product concentration; The control device is used to obtain the real-time gas quality according to the purity, humidity and decomposition product concentration, and dynamically adjust the operating frequency of the gas driving device according to the real-time gas quality to adjust the gas processing time of the purification device.

3. The online insulating gas treatment system for electrical equipment according to claim 1, characterized in that: Also includes: a first connecting pipeline; One end of the first connecting pipeline is connected to the first recovery / recharge port of the electrical device, a first control valve is provided on the first connecting pipeline near the first recovery / recharge port, and the other end of the first connecting pipeline intersects with the main processing loop at a first connection point; Correspondingly, with the first connection point as the starting point, along the gas circulation direction of the main processing loop, the mass flow detection device, the first purification device and the gas driving device are sequentially arranged in series; The detection bypass is arranged in parallel on the main processing loop after the first connection point and before the mass flow detection device, so as to perform bypass sampling detection on the gas before it flows into the mass flow detection device; A third control valve is provided before the air inlet end of the first purification device; A fourth control valve is provided on the main processing loop from the gas driving device to the first connection point along the gas circulation direction.

4. The online insulating gas treatment system for electrical equipment according to claim 3, characterized in that: The electrical device has only one recovery / recharge port, and the processing system further includes: a second connecting pipeline; A fifth control valve is provided on the second connecting pipeline; The air inlet end of the second connecting pipeline intersects with the main processing loop at a second connection point after the mass flow detection device and before the third control valve; The gas outlet end of the second connecting pipeline intersects with the first connecting pipeline at a third connecting point after the first control valve and before the first connecting point; A second control valve is further provided between the third connection point and the first connection point on the first connection pipeline.

5. The online insulating gas treatment system for electrical equipment according to claim 3, characterized in that: The electrical device includes a plurality of recovery / recharge ports, and the processing system further includes: a second connecting pipeline; A fifth control valve is provided on the second connecting pipeline; The inlet end of the second connecting pipeline intersects with the main processing loop at a second connection point after the mass flow detection device and before the third control valve; The gas outlet end of the second connecting pipeline is connected to any other recovery / recharge port on the electrical device except the first recovery / recharge port.

6. The online insulating gas treatment system for electrical equipment according to claim 1, characterized in that: The gas driving device is a variable frequency air compressor, and a second purification device is provided after the variable frequency air compressor; Accordingly, the first purification device is used to perform preliminary adsorption on the gas to be treated to obtain an intermediate treated gas; The variable frequency air compressor is used to pressurize the intermediate processed gas and then send it into the second purification device; The second purification device is used to perform high-pressure deep adsorption on the pressurized intermediate processing gas.

7. The online insulating gas treatment system for electrical equipment according to claim 6, characterized in that: The main processing loop is also provided with a first flow regulating device and a second flow regulating device, which are respectively connected to the control device; The first purification device, the first flow regulating device, the variable frequency air compressor, and the second flow regulating device are sequentially arranged in series along the gas circulation direction of the main processing loop; Accordingly, the control device is further configured to adjust the first gas processing time of the first purification device and the air intake flow rate of the variable frequency air compressor according to the real-time gas quality, in combination with Darcy's law and the first gas volume of the first purification device; The control device is further configured to adjust the second gas processing time of the second purification device and the gas outlet flow rate of the second purification device according to the real-time gas quality, in combination with Darcy's law and the second gas volume of the second purification device.

8. The online insulating gas treatment system for electrical equipment according to claim 1, characterized in that: Also includes: A vacuum pumping device is connected to the control device and is used to perform a vacuum operation on the processing system before recovering the gas to be processed according to the control of the control device.

9. The online insulating gas treatment system for electrical equipment according to any one of claims 1 to 8, characterized in that: Also includes: The gas replenishing device is connected to the control device and is used to replenish the standard insulating gas to the processing system according to the control of the control device.

10. An online treatment method for insulating gas of electrical equipment, applied to the online treatment system for insulating gas of electrical equipment according to any one of claims 1 to 10, characterized in that: include: Obtain the cumulative mass ∑m of the gas to be treated that is recovered from the electrical equipment to the treatment system 回 The quality of the insulating gas that meets the standards and is returned to the electrical equipment from the processing system is accumulated ∑m 回充 , and real-time detection data of the gas detection device; According to the real-time detection data, the real-time gas quality is obtained, and the operation of the gas driving device is controlled according to the real-time gas quality, and in |∑m 回收 -∑m 回充 |Recharge stops when the quality is less than or equal to the preset threshold.

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