Electrical equipment dehumidification device and method with air chamber humidity detection function

Abstract

The invention relates to the technical field of electrical equipment humidity detection, in particular to an electrical equipment dehumidification device and method with an air chamber humidity detection.The electrical equipment dehumidification device comprises an air chamber, a recycling and purifying unit, an air storage tank, online detection equipment, a vaporizer, a vacuum pump and a filling unit, and the recycling and purifying unit comprises a filter, a recycling compressor and a vacuum compressor; the filling unit comprises a nitrogen steel cylinder and a sulfur hexafluoride filling steel cylinder, the device further comprises a PLC (Programmable Logic Controller), and all the devices are connected with the PLC; and after the sulfur hexafluoride in the gas chamber is automatically recovered through the PLC, the gas chamber is subjected to vacuumizing, nitrogen filling replacement and emptying operation, and then the gas chamber is filled with the sulfur hexafluoride. According to the invention, the gas in the gas chamber of the high-voltage electrical equipment is cyclically treated by adopting a unique purification treatment mode, impurities such as micro water, decomposition product gas and dust particles in the gas can be treated at the same time, and the recycled gas can be recycled after being purified without replacing new gas.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment humidity detection, in particular to an electrical equipment dehumidification device and method with air chamber humidity detection. Background Art

[0002] "Trace moisture" can refer to tiny water droplets or water with a moisture content below 0.1%. Trace moisture is a critical parameter in industrial production, particularly in the power industry. Trace moisture can appear in transformers, insulating oils, and lubricating oils, reducing the insulation performance of the equipment, leading to malfunctions or hidden faults. It can also deteriorate the insulating and lubricating oils, directly impacting the reliability and lifespan of power systems. Therefore, regular testing and monitoring of the trace moisture content in power equipment is essential to avoid equipment failures and ensure the safe operation of power systems. Methods for controlling trace moisture content primarily include the following three aspects: first, separating the water from the original oil through filtration and separation; second, using dehydrating agents or adsorbents to absorb or remove the water from the oil; and third, reducing the water content by heating and treating the water-containing oil with activators.

[0003] Moisture traces in electrical equipment can react chemically with the insulating medium, SF6 gas, under conditions such as discharge and overheating, producing toxic and corrosive decomposition products such as SO2, H2S, and SOF2. Furthermore, when humidity is excessively high, this moisture can condense on the internal surfaces of the equipment, potentially leading to flashover failures. GB / T 8905-2012, "Guidelines for the Management and Detection of Sulfur Hexafluoride Gas in Electrical Equipment," requires that the humidity level in the arc extinguishing chamber of operating electrical equipment should be below 150 μL / L. Currently, the problem of excessive humidity in SF6 gas-fired electrical equipment is typically addressed through fresh gas replacement. The specific dehumidification process involves first extracting the excessively humid SF6 gas from the equipment after operation and then injecting fresh SF6 gas with the required humidity. However, this moisture is not only distributed throughout the SF6 gas, but also, due to intermolecular interactions, some of it adheres to the internal surfaces of the electrical equipment and the exterior surfaces of its functional components. The existing method of fresh gas replacement can only remove trace water in the gas. After replacement, the trace water attached to the inside of the electrical equipment will diffuse back into the SF6 gas, causing the humidity of the SF6 gas in the electrical equipment to still exceed the standard.

[0004] To address these issues, some have proposed using low-value nitrogen displacement dehumidification. This involves repeatedly adding and removing nitrogen until the extracted nitrogen meets the required humidity, and then introducing fresh SF6 into the electrical equipment. However, intermolecular forces are negatively correlated with temperature. At low temperatures, trace amounts of water adhere to the inner surfaces of electrical equipment and the outer surfaces of internal functional components, with only a small amount diffusing into the gas. This results in low displacement efficiency. Prolonged outages of electrical equipment can lead to increased regional power supply pressure or prolonged power outages, posing significant safety and economic risks. Furthermore, the diffusion rate of moisture is slow at low temperatures, and the attached traces of water have not yet reached a new equilibrium state of attachment and evaporation with the traces of water in the gas. Even if the extracted nitrogen meets the required humidity, the attached traces of water will continue to diffuse into the SF6 gas after fresh SF6 is introduced, causing the gas humidity to exceed the standard.

[0005] Therefore, it is urgent to study a new and efficient dehumidification method for electrical equipment. Summary of the Invention

[0006] The present invention provides an electrical equipment dehumidification device and method with gas chamber humidity detection, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the existing problems of dehumidification difficulties and excessive gas humidity during the operation of electrical equipment.

[0007] One of the technical solutions of the present invention is achieved through the following measures: a dehumidification device for electrical equipment with air chamber humidity detection, comprising an air chamber, a recovery and purification unit, an air storage tank, a first online detection device, a second online detection device, a vaporizer, a vacuum pump, and a filling unit. A first delivery pipeline is fixedly connected between the air chamber and the recovery and purification unit, a second delivery pipeline is fixedly connected between the recovery and purification unit and the inlet of the air storage tank, a first detection pipeline is fixedly connected between the first delivery pipeline and the second delivery pipeline, a first online detection device is fixedly installed on the first detection pipeline, and a second delivery pipeline is fixedly connected between the air storage tank and the vaporizer. There are three conveying pipelines. A fourth conveying pipeline is fixedly connected between the vaporizer and the first detection pipeline and the first conveying pipeline between the recovery and purification unit. A vacuum pumping pipeline is fixedly connected between the fourth conveying pipeline and the vacuum pump. A vacuum pump is fixedly installed on the vacuum pumping pipeline. A filling pipeline is fixedly connected between the third conveying pipeline and the filling unit. A first detection pipeline is fixedly connected to the first conveying pipeline between the fourth conveying pipeline and the gas chamber. A second detection pipeline is fixedly connected to the second conveying pipeline. A first online detection device is fixedly installed on the outlet of the first detection pipeline, and a second online detection device is fixedly installed on the outlet of the second detection pipeline.

[0008] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The above-mentioned recovery and purification unit includes a filter, a recovery compressor, and a vacuum compressor. The outlet of the first delivery pipeline is fixedly connected to the filter, the fifth delivery pipeline is fixedly connected between the filter outlet and the inlet of the recovery compressor, the second delivery pipeline is fixedly connected between the recovery compressor outlet and the air storage tank, the sixth delivery pipeline is fixedly connected to the first delivery pipeline between the fourth delivery pipeline and the filter, and a vacuum compressor is fixedly installed on the sixth delivery pipeline.

[0009] The above-mentioned filling unit includes a nitrogen cylinder, a sulfur hexafluoride filling cylinder and a quick connector. The quick connector includes a male head and a female head. The filling pipeline is fixedly connected to the nitrogen pipeline. The inlets of the filling pipeline and the nitrogen pipeline are both provided with a female head, and the outlets of the nitrogen cylinder and the sulfur hexafluoride filling cylinder are both provided with a male head.

[0010] The above also includes a sulfur hexafluoride storage cylinder, a recovery gas pipeline is fixedly connected to the second delivery pipeline between the recovery compressor and the second detection pipeline, the outlet of the recovery gas pipeline is provided with a female head, the outlet of the sulfur hexafluoride storage cylinder is provided with a male head, a seventh delivery pipeline is fixedly connected between the third delivery pipeline between the filling pipeline and the gas storage tank and the fourth delivery pipeline between the first delivery pipeline and the vacuum line, and an emptying pipeline is fixedly connected to the vacuum line between the vacuum pump and the fourth delivery pipeline.

[0011] The filter is provided in one or more ways, a molecular sieve filter element is provided in the filter, and a heating component is provided between the inner wall of the filter and the molecular sieve filter element.

[0012] The above also includes a PLC controller, a weighing meter and a first pressure gauge are fixedly installed on the gas storage tank, a heater is fixedly installed inside the gas storage tank, a second pressure gauge is fixedly installed on the gas chamber, a vacuum gauge is fixedly installed on the vacuum pipeline between the fourth delivery pipeline and the emptying pipeline, a first valve and a third pressure gauge are fixedly installed on the recovery gas pipeline in sequence according to the flow direction of the medium, a second valve and a third valve are fixedly installed on the filling pipeline and the nitrogen pipeline between the nitrogen pipeline and the sulfur hexafluoride filling cylinder, a fourth valve and a fifth valve are fixedly installed on the first detection pipeline and the second detection pipeline, respectively, and a sixth valve is fixedly installed on the first delivery pipeline between the inlet of the sixth delivery pipeline and the outlet of the sixth delivery pipeline A door is provided, a seventh valve is fixedly provided on the seventh delivery pipeline, an eighth valve and a muffler are fixedly provided on the exhaust pipeline in sequence according to the flow direction of the medium, a ninth valve is fixedly provided on the second delivery pipeline between the recovery gas pipeline and the second detection pipeline, a tenth valve is fixedly provided on the third delivery pipeline between the seventh delivery pipeline and the gas storage tank, the first online detection equipment, the second online detection equipment, the vacuum pump, the recovery compressor, the vacuum compressor, the weighing meter, the first pressure gauge, the second pressure gauge, the vacuum gauge, the third pressure gauge, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve and the tenth valve are all connected to the PLC controller.

[0013] The second technical solution of the present invention is achieved by the following measures: a dehumidification method for electrical equipment with air chamber humidity detection is carried out according to the following method: The first step is to recover the sulfur hexafluoride in the gas chamber; The second step is to vacuum the air chamber; The third step is to perform nitrogen replacement operation on the gas chamber; The fourth step is to empty the system; The fifth step is to fill the gas chamber with sulfur hexafluoride.

[0014] The following is a further optimization and / or improvement of the second technical solution of the above invention: In the above-mentioned first step, the specific operation of sulfur hexafluoride recovery includes: starting the recovery compressor, opening the sixth valve and the ninth valve, and activating the high-pressure recovery mode. The gas in the gas chamber is filtered through the filter, compressed by the recovery compressor, and stored in the gas storage tank. At the same time, the fourth valve is opened, and the humidity of the sulfur hexafluoride gas at the gas chamber outlet is detected by the first online detection equipment. The fifth valve is opened, and the humidity of the sulfur hexafluoride gas entering the gas storage tank is detected by the second online detection equipment. When the second pressure gauge shows a negative pressure state, the sixth valve is closed, the vacuum compressor is started, and the low-pressure recovery mode is activated. The sulfur hexafluoride recovery operation is completed until the humidity detected by one of the first online detection equipment and the second online detection equipment reaches 0 to 150 ppm.

[0015] In the above-mentioned second step, the vacuum operation specifically includes: opening the eighth valve to evacuate the system pressure; when the pressure of the gas chamber drops to normal pressure, closing the eighth valve, starting the vacuum pump, vacuuming the gas chamber to 133Pa, and continuing to pump air for 10 minutes to 120 minutes, stopping the vacuum pump, recording the vacuum degree PA1 after 30 minutes, and recording the vacuum degree PB1 after standing for the required time; when PB1-PA1<133Pa, the vacuum operation is completed; or / and, in the third step, the nitrogen replacement operation specifically includes: recycling the purification unit and stopping the vacuum pump, setting the nitrogen filling pressure value, opening the third valve, and the nitrogen in the nitrogen cylinder enters the gas chamber through the vaporizer along the fourth delivery pipeline, When the second pressure gauge displays a value of 0.12MPa, close the third valve, stop the nitrogen filling and replacement operation, and let it stand for the required time until the humidity value measured by the first online detection equipment stabilizes to 0 to 150ppm, and the nitrogen filling and replacement operation is completed; or / and, in the fourth step, open the eighth valve to evacuate the system pressure. When the air chamber pressure drops to normal pressure, close the eighth valve, start the vacuum pump, enable the emptying mode, and evacuate to 133Pa. Continue to evacuate for 10 to 120 minutes, stop the vacuum pump, and record the vacuum degree PA2 after 30 minutes. Let it stand for the required time and record the vacuum degree PB2. When PB2-PA2<133Pa, the emptying operation is completed.

[0016] In the fifth step, when the system evacuation operation is completed, the gas chamber needs to be refilled with sulfur hexafluoride. The specific operation of filling sulfur hexafluoride includes: setting the sulfur hexafluoride filling pressure value, opening the second valve, and allowing sulfur hexafluoride to enter the gas chamber through the vaporizer and along the fourth delivery pipeline. When the second pressure gauge shows a pressure of 0 to 0.7 MPa, stopping the filling of sulfur hexafluoride.

[0017] The present invention simultaneously has the functions of recovering and purifying sulfur hexafluoride gas from electrical equipment, vacuuming, nitrogen replacement, and backfilling. It is a multi-purpose machine and adopts a unique purification treatment method to circulate the gas in the gas chamber of high-voltage electrical equipment. It can simultaneously treat impurities such as trace water, decomposition product gas and dust particles in the gas. The recovered gas can be recycled after purification without the need to replace new gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attachment Figure 1 It is a schematic diagram of the process flow of the present invention.

[0019] The codes in the accompanying drawings are: 1 for the air chamber, 2 for the gas storage tank, 3 for the first online detection equipment, 4 for the vaporizer, 5 for the vacuum pump, 6 for the first delivery pipeline, 7 for the second delivery pipeline, 8 for the first detection pipeline, 9 for the third delivery pipeline, 10 for the fourth delivery pipeline, 11 for the vacuum pipeline, 12 for the filling pipeline, 13 for the filter, 14 for the recovery compressor, 15 for the vacuum compressor, 16 for the fifth delivery pipeline, 17 for the sixth delivery pipeline, 18 for the nitrogen cylinder, 19 for the sulfur hexafluoride filling cylinder, 20 for the nitrogen pipeline 20, 21 for the second detection pipeline, 22 is the seventh delivery pipeline, 23 is the second online detection equipment, 24 is the emptying pipeline, 25 is the recovery gas pipeline, 26 is the sulfur hexafluoride storage cylinder, 27 is the weighing meter, 28 is the first pressure gauge, 29 is the heater, 30 is the second pressure gauge, 31 is the vacuum gauge, 32 is the first valve, 33 is the third pressure gauge, 34 is the second valve, 35 is the third valve, 36 is the fourth valve, 37 is the fifth valve, 38 is the sixth valve, 39 is the seventh valve, 40 is the eighth valve, 41 is the ninth valve, 42 is the tenth valve, and 43 is the muffler. DETAILED DESCRIPTION

[0020] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions. Unless otherwise specified, the various chemical reagents and chemicals mentioned in the present invention are all chemical reagents and chemicals known and used in the prior art.

[0021] The present invention will be further described below in conjunction with the embodiments: Example 1: As shown in the attached Figure 1 As shown, the dehumidification device for electrical equipment with air chamber humidity detection includes an air chamber 1, a recovery and purification unit, an air storage tank 2, a first online detection device 3, a second online detection device 23, a vaporizer 4, a vacuum pump 5, and a filling unit. A first delivery pipeline 6 is fixedly connected between the air chamber 1 and the recovery and purification unit, a second delivery pipeline 7 is fixedly connected between the recovery and purification unit and the inlet of the air storage tank 2, a third delivery pipeline 9 is fixedly connected between the air storage tank 2 and the vaporizer 4, and a fourth delivery pipeline is fixedly connected between the vaporizer 4 and the first delivery pipeline 6. Line 10, the fourth conveying pipeline 10 is fixedly connected with a vacuum pumping pipeline 11, and a vacuum pump 5 is fixedly installed on the vacuum pumping pipeline 11. The third conveying pipeline 9 is fixedly connected with a filling pipeline 12 between the third conveying pipeline 9 and the filling unit. The first conveying pipeline 6 between the fourth conveying pipeline 10 and the air chamber 1 is fixedly connected with a first detection pipeline 8, and the second conveying pipeline is fixedly connected with a second detection pipeline 21. The outlet of the first detection pipeline 8 is fixedly installed with a first online detection device 3, and the outlet of the second detection pipeline 21 is fixedly installed with a second online detection device 23.

[0022] In the present invention, the first online detection device 3 and the second online detection device 23 can adopt online dew point meters. The first online detection device 3 detects that the humidity in the gas chamber 1 exceeds the standard value (generally required to be less than 150ppm), and the sulfur hexafluoride gas in the gas chamber 1 is recovered together with trace water to the gas storage tank 2 through the recovery and purification unit, and then the system is evacuated by the vacuum pump 5 to further remove the residual sulfur hexafluoride gas and non-condensable gas in the system; then, after nitrogen replacement through the filling unit, the vacuum pump 5 is started to empty the system; finally, sulfur hexafluoride gas with humidity meeting the standard is filled in through the filling unit to achieve the purpose of dehumidification and purification of the gas chamber 1, thereby ensuring the safe operation of the electrical equipment system.

[0023] As needed, electric heating can be provided outside the gas chamber 1 to accelerate the rapid gasification of the liquid in the gas chamber 1 .

[0024] Example 2: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the recovery and purification unit includes a filter 13, a recovery compressor 14, and a vacuum compressor 15. The outlet of the first delivery pipeline 6 is fixedly connected to the filter 13, and a fifth delivery pipeline 16 is fixedly connected between the outlet of the filter 13 and the inlet of the recovery compressor 14. The second delivery pipeline 7 is fixedly connected between the outlet of the recovery compressor 14 and the air storage tank 2. The first delivery pipeline 6 between the fourth delivery pipeline 10 and the filter 13 is fixedly connected to a sixth delivery pipeline 17, and the vacuum compressor 15 is fixedly installed on the sixth delivery pipeline 17.

[0025] As needed, during the recovery process of the recovery compressor 14, due to the work done, the sulfur hexafluoride is in a high-temperature and high-pressure state, which is extremely difficult to compress and liquefy, affecting the recovery and purification efficiency. Therefore, the recovery compressor 14 adopts a refrigeration compressor. The refrigeration compressor uses R410A refrigerant (‌R410A refrigerant is composed of two fluorocarbon compounds, difluoromethane and pentafluoroethane, mixed in a ratio of 1:1) in a vapor compression refrigeration system to increase the refrigerant from low pressure to high pressure and circulate the refrigerant continuously, so that the system continuously discharges internal heat to an environment higher than the system temperature, ensuring that the sulfur hexafluoride can be quickly recovered and stored in liquid form under an ambient temperature above 40°C, thereby ensuring work efficiency.

[0026] Example 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the filling unit includes a nitrogen cylinder 18, a sulfur hexafluoride filling cylinder 19 and a quick connector. The quick connector includes a male connector and a female connector. The filling pipeline 12 is fixedly connected to the nitrogen pipeline 20. The inlets of the filling pipeline 12 and the nitrogen pipeline 20 are both provided with female connectors, and the outlets of the nitrogen cylinder 18 and the sulfur hexafluoride filling cylinder 19 are both provided with male connectors.

[0027] As needed, the filling pipeline 12 and the sulfur hexafluoride filling cylinder 19, and the nitrogen pipeline 20 and the nitrogen cylinder 18 are respectively connected by a detachable connection method. When the gas chamber 1 needs to be filled with nitrogen for replacement, the nitrogen cylinder 18 is connected to the nitrogen pipeline 20; when the gas chamber 1 needs to be refilled with sulfur hexafluoride, the sulfur hexafluoride filling cylinder 19 is connected to the filling pipeline 12.

[0028] Example 4: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, it also includes a sulfur hexafluoride storage cylinder 26, a recovery gas pipeline 25 is fixedly connected to the second delivery line 7 between the recovery compressor 14 and the second detection pipeline 21, the outlet of the recovery gas pipeline 25 is provided with a female connector, and the outlet of the sulfur hexafluoride storage cylinder 26 is provided with a male connector. A seventh delivery pipeline 22 is fixedly connected between the third delivery pipeline 9 between the filling pipeline 12 and the gas storage tank 2 and the fourth delivery pipeline 10 between the first delivery pipeline 6 and the vacuum line 11, and an emptying pipeline 24 is fixedly connected to the vacuum line 11 between the vacuum pump 5 and the fourth delivery pipeline 10.

[0029] As needed, the recovery gas pipeline 25 is connected to the sulfur hexafluoride storage cylinder 26 through a detachable connection. As needed, the sulfur hexafluoride storage cylinder 26 can also be connected to the filling pipeline 12 through a detachable connection. When the humidity of the sulfur hexafluoride gas recovered into the gas storage tank 2 is higher than 150 ppm and cannot be reused, the sulfur hexafluoride gas in the gas storage tank 2 can be circulated and purified through the seventh delivery pipeline 22 and the recovery and purification unit.

[0030] Example 5: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, one or more filters 13 are provided, a molecular sieve filter element is provided in the filter 13 , and a heating component is provided between the inner wall of the filter 13 and the molecular sieve filter element.

[0031] According to needs, the molecular sieve filter element can be one or more of alumina, 13X molecular sieve, and 5A molecular sieve, and the filtration accuracy of the filter element is 0.1μm to 1μm.

[0032] ‌13X molecular sieve is a sodium aluminosilicate with a chemical formula of Na2O·Al2O3·2SiO2·4.5H2O and a pore size of about 10×10 -7 mm; ‌5A molecular sieve is a calcium aluminosilicate with a chemical formula of 3 / 4CaO·1 / 4Na2O·Al2O3·2SiO2·4.5H2O and a pore size of about 5×10 -7 mm.

[0033] By utilizing the adsorption principle of molecular sieves, the filter 13 processes impurities, decomposition products, moisture, mineral oil, etc. in the sulfur hexafluoride gas, reducing the system humidity to 0 to 40 ppm; the heating component uses a heating rod, which has resistance heating inside. When the gas is recovered, the evaporation and discharge of the internal moisture are accelerated.

[0034] Example 6: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, it also includes a PLC controller, a weighing scale 27 and a first pressure gauge 28 are fixedly provided on the gas storage tank 2, a heater 29 is fixedly provided inside the gas storage tank 2, a second pressure gauge 30 is fixedly provided on the gas chamber 1, a vacuum gauge 31 is fixedly provided on the vacuum line 11 between the fourth delivery pipeline 10 and the emptying pipeline 24, a first valve 32 and a third pressure gauge 33 are fixedly provided on the recovery gas pipeline 25 in sequence according to the flow direction of the medium, a second valve 34 and a third valve 35 are fixedly provided on the filling pipeline 12 and the nitrogen pipeline 20 between the nitrogen pipeline 20 and the sulfur hexafluoride filling cylinder 19, respectively, a fourth valve 36 and a fifth valve 37 are fixedly provided on the first detection pipeline 8 and the second detection pipeline 21, respectively, a sixth valve 38 is fixedly provided on the first delivery pipeline 6 between the inlet of the sixth delivery pipeline 17 and the outlet of the sixth delivery pipeline 17, and a seventh delivery pipeline 17 is fixedly provided on the first delivery pipeline 6 between the inlet of the sixth delivery pipeline 17 and the outlet of the sixth delivery pipeline 17. A seventh valve 39 is fixedly provided on the delivery pipeline 22, an eighth valve 40 and a muffler 43 are fixedly provided on the emptying pipeline 24 in sequence according to the flow direction of the medium, a ninth valve 41 is fixedly provided on the second delivery pipeline 7 between the recovery gas pipeline 25 and the second detection pipeline 21, and a tenth valve 42 is fixedly provided on the third delivery pipeline 9 between the seventh delivery pipeline 22 and the gas storage tank 2. The first online detection equipment 3, the second online detection equipment 23, the vacuum pump 5, the recovery compressor 14, the vacuum compressor 15, the weighing meter 27, the first pressure gauge 28, the second pressure gauge 30, the vacuum gauge 31, the third pressure gauge 33, the first valve 32, the second valve 34, the third valve 35, the fourth valve 36, the fifth valve 37, the sixth valve 38, the seventh valve 39, the eighth valve 40, the ninth valve 41 and the tenth valve 42 are all connected to the PLC controller.

[0035] As needed, the gas tank 2 is used to store the recovered sulfur hexafluoride gas. The gas tank 2 has weighing and heating functions, and is equipped with safety accessories such as a pressure gauge and a safety valve. The heating function is achieved by using a heater 29, and the heater 29 has resistance heating inside.

[0036] In the present invention, unless otherwise specified, the equipment and devices used are all publicly known equipment and devices in the art.

[0037] As needed, the pipelines and equipment of the electrical equipment dehumidification device with air chamber humidity detection can also be equipped with conventional valves, thermometers and pressure gauges known and used in the art according to production needs.

[0038] Example 7: As shown in the attached Figure 1 As shown, the dehumidification method for electrical equipment with air chamber humidity detection is carried out according to the following method: The first step is to recover the sulfur hexafluoride in the gas chamber 1; The second step is to vacuum the air chamber 1; The third step is to perform nitrogen filling and replacement operation on the gas chamber 1; The fourth step is to empty the system; The fifth step is to fill the gas chamber 1 with sulfur hexafluoride.

[0039] Example 8: As an optimization of the above embodiment, as shown in the attached Figure 1 In the first step, the specific operation of sulfur hexafluoride recovery includes: starting the recovery compressor 14, opening the sixth valve 38 and the ninth valve 41, and activating the high-pressure recovery mode. The sulfur hexafluoride gas in the gas chamber 1 is filtered through the filter 13, compressed by the compressor 14, and stored in the gas storage tank 2. At the same time, the fourth valve 36 is opened, and the humidity of the sulfur hexafluoride gas at the gas chamber outlet is detected by the first online detection device 3. The fifth valve 37 is opened, and the humidity of the sulfur hexafluoride gas entering the gas storage tank 2 is detected by the second online detection device 23. When the second pressure gauge 30 shows a negative pressure state, the sixth valve 38 is closed, the vacuum compressor 15 is started, and the low-pressure recovery mode is activated. The sulfur hexafluoride recovery operation is completed until the humidity detected by one of the first online detection device 3 and the second online detection device 23 reaches 0 to 150 ppm.

[0040] As needed, when the second online detection device 23 detects that the humidity of the gas entering the gas storage tank 2 is lower than 150 ppm, the ninth valve 41 can be closed and the first valve 32 can be opened to directly recover the sulfur hexafluoride gas into the sulfur hexafluoride storage cylinder 26.

[0041] Example 9: As an optimization of the above embodiment, as shown in the attached Figure 1 In the second step, the vacuum operation specifically includes: opening the eighth valve 40 to evacuate the system pressure; when the pressure of the air chamber 1 drops to normal pressure, closing the eighth valve 40, starting the vacuum pump 5, and vacuuming the air chamber 1 to 133Pa, and then continuing to pump air for 10 minutes to 120 minutes, stopping the vacuum pump 5, and recording the vacuum degree PA1 after 30 minutes; recording the vacuum degree PB1 after standing for the required time; when PB1-PA1<133Pa, the vacuum operation is completed.

[0042] The standing time is usually 0.5h to 2h depending on the needs.

[0043] Example 10: As an optimization of the above embodiment, as shown in the attached Figure 1In the third step, the specific operation of nitrogen replacement includes: stopping the recovery and purification unit and the vacuum pump, setting the nitrogen filling pressure value, opening the third valve 35, and the nitrogen in the nitrogen cylinder 18 passes through the vaporizer 4 and enters the gas chamber 1 along the fourth delivery pipeline 10. When the second pressure gauge 30 displays a value of 0.12MPa, the third valve 35 is closed, the nitrogen replacement operation is stopped, and the nitrogen is allowed to stand for the required time until the humidity value measured by the first online detection device 3 is stable at 0 to 150ppm, and the nitrogen replacement operation is completed.

[0044] As needed, a pressure gauge is provided on the nitrogen cylinder. The setting of the nitrogen filling pressure value is based on the pressure gauge on the nitrogen cylinder. The standing time is usually 0.5h to 24h.

[0045] Example 11: As an optimization of the above embodiment, as shown in the attached Figure 1 In the fourth step, the emptying operation specifically includes: opening the eighth valve 40 to empty the system pressure. When the pressure of the air chamber 1 reaches normal pressure, closing the eighth valve 40, starting the vacuum pump 5, and enabling the emptying mode until the vacuum reaches 133Pa. Then continue to pump air for 10 to 120 minutes, stop the vacuum pump 5, record the vacuum degree PA2 after 30 minutes, and record the vacuum degree PB2 for the required standing time. When PB2-PA2<133Pa, the emptying operation is completed.

[0046] The standing time is usually 0.5h to 2h depending on the needs.

[0047] Example 12: As an optimization of the above embodiment, as shown in the attached Figure 1 In the fifth step, when the system emptying operation is completed, the gas chamber 1 needs to be refilled with sulfur hexafluoride. The specific operation of filling sulfur hexafluoride includes: setting the sulfur hexafluoride filling pressure value, opening the second valve 34, and sulfur hexafluoride enters the gas chamber 1 through the vaporizer 4 and along the fourth delivery pipeline 10. When the second pressure gauge 30 shows a pressure of 0 to 0.7 MPa, the filling of sulfur hexafluoride is stopped.

[0048] As needed, a pressure gauge is provided on the sulfur hexafluoride filling cylinder 19 , and the setting of the sulfur hexafluoride filling pressure value is based on the setting of the pressure gauge on the sulfur hexafluoride filling cylinder 19 .

[0049] In summary, the present invention combines multifunctional modularization and integration into one device, adopts a PLC control system for operation, and has multiple uses in one machine. It can automatically realize the functions of humidity detection, recovery and purification, vacuuming, nitrogen replacement, and refilling of the gas chamber of electrical equipment, effectively solving the existing problems of dehumidification difficulties and excessive gas humidity during the operation of electrical equipment.

[0050] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A dehumidification device for electrical equipment with air chamber humidity detection, characterized in that It includes an air chamber, a recovery and purification unit, an air storage tank, a first online detection device, a second online detection device, a vaporizer, a vacuum pump, and a filling unit. A first conveying pipeline is fixedly connected between the air chamber and the recovery and purification unit, a second conveying pipeline is fixedly connected between the recovery and purification unit and the inlet of the air storage tank, a first detection pipeline is fixedly connected between the first conveying pipeline and the second conveying pipeline, a first online detection device is fixedly installed on the first detection pipeline, a third conveying pipeline is fixedly connected between the air storage tank and the vaporizer, a fourth conveying pipeline is fixedly connected between the vaporizer and the first detection pipeline and the first conveying pipeline between the recovery and purification unit, a vacuum pumping pipeline is fixedly connected between the fourth conveying pipeline and the vacuum pump, a vacuum pump is fixedly installed on the vacuum pump, a filling pipeline is fixedly connected between the third conveying pipeline and the filling unit, the first detection pipeline is fixedly connected between the fourth conveying pipeline and the first conveying pipeline between the air chamber, the second detection pipeline is fixedly connected on the second conveying pipeline, the first online detection device is fixedly installed on the outlet of the first detection pipeline, and the second online detection device is fixedly installed on the outlet of the second detection pipeline.

2. The electrical equipment dehumidification device with air chamber humidity detection according to claim 1, characterized in that The recovery and purification unit includes a filter, a recovery compressor, and a vacuum compressor. The outlet of the first delivery pipeline is fixedly connected to the filter, the fifth delivery pipeline is fixedly connected between the filter outlet and the inlet of the recovery compressor, the second delivery pipeline is fixedly connected between the outlet of the recovery compressor and the air storage tank, the sixth delivery pipeline is fixedly connected to the first delivery pipeline between the fourth delivery pipeline and the filter, and a vacuum compressor is fixedly installed on the sixth delivery pipeline.

3. The electrical equipment dehumidification device with air chamber humidity detection according to claim 1 or 2, characterized in that The filling unit includes a nitrogen cylinder, a sulfur hexafluoride filling cylinder and a quick connector. The quick connector includes a male head and a female head. The filling pipeline is fixedly connected to the nitrogen pipeline. The inlets of the filling pipeline and the nitrogen pipeline are both provided with a female head, and the outlets of the nitrogen cylinder and the sulfur hexafluoride filling cylinder are both provided with a male head.

4. The electrical equipment dehumidification device with air chamber humidity detection according to claim 1, 2 or 3, characterized in that It also includes a sulfur hexafluoride storage cylinder, a recovery gas pipeline fixedly connected to the second delivery pipeline between the recovery compressor and the second detection pipeline, the outlet of the recovery gas pipeline is provided with a female head, the outlet of the sulfur hexafluoride storage cylinder is provided with a male head, a seventh delivery pipeline fixedly connected between the third delivery pipeline between the filling pipeline and the gas storage tank and the fourth delivery pipeline between the first delivery pipeline and the vacuum line, and an emptying pipeline fixedly connected to the vacuum line between the vacuum pump and the fourth delivery pipeline.

5. The electrical equipment dehumidification device with air chamber humidity detection according to claim 2, 3 or 4, characterized in that One or more filters are provided, a molecular sieve filter element is provided in the filter, and a heating component is provided between the inner wall of the filter and the molecular sieve filter element.

6. The electrical equipment dehumidification device with air chamber humidity detection according to claim 4 or 5, characterized in that It also includes a PLC controller, a weighing meter and a first pressure gauge are fixedly installed on the gas storage tank, a heater is fixedly installed inside the gas storage tank, a second pressure gauge is fixedly installed on the gas chamber, a vacuum gauge is fixedly installed on the vacuum pipeline between the fourth delivery pipeline and the emptying pipeline, a first valve and a third pressure gauge are fixedly installed on the recovery gas pipeline in sequence according to the flow direction of the medium, a second valve and a third valve are fixedly installed on the filling pipeline and the nitrogen pipeline between the nitrogen pipeline and the sulfur hexafluoride filling cylinder, a fourth valve and a fifth valve are fixedly installed on the first detection pipeline and the second detection pipeline, and a sixth valve is fixedly installed on the first delivery pipeline between the inlet of the sixth delivery pipeline and the outlet of the sixth delivery pipeline. A seventh valve is fixedly provided on the seventh conveying pipeline, an eighth valve and a muffler are fixedly provided on the emptying pipeline in sequence according to the flow direction of the medium, a ninth valve is fixedly provided on the second conveying pipeline between the recovery gas pipeline and the second detection pipeline, a tenth valve is fixedly provided on the third conveying pipeline between the seventh conveying pipeline and the gas storage tank, the first online detection equipment, the second online detection equipment, the vacuum pump, the recovery compressor, the vacuum compressor, the weighing meter, the first pressure gauge, the second pressure gauge, the vacuum gauge, the third pressure gauge, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve and the tenth valve are all connected to the PLC controller.

7. A dehumidification method for electrical equipment with air chamber humidity detection according to any one of claims 1 to 6, characterized in that Proceed as follows: The first step is to recover the sulfur hexafluoride in the gas chamber; The second step is to vacuum the air chamber; The third step is to perform nitrogen replacement operation on the gas chamber; The fourth step is to empty the system; The fifth step is to fill the gas chamber with sulfur hexafluoride.

8. The dehumidification method for electrical equipment with air chamber humidity detection according to claim 7, characterized in that In the first step, the specific operation of sulfur hexafluoride recovery includes: starting the recovery compressor, opening the sixth valve and the ninth valve, and activating the high-pressure recovery mode. The gas in the gas chamber is filtered through the filter, compressed by the recovery compressor, and stored in the gas storage tank. At the same time, the fourth valve is opened, and the humidity of the sulfur hexafluoride gas at the gas chamber outlet is detected by the first online detection equipment. The fifth valve is opened, and the humidity of the sulfur hexafluoride gas entering the gas storage tank is detected by the second online detection equipment. When the second pressure gauge shows a negative pressure state, the sixth valve is closed, the vacuum compressor is started, and the low-pressure recovery mode is activated. The sulfur hexafluoride recovery operation is completed until the humidity detected by one of the first online detection equipment and the second online detection equipment reaches 0 to 150 ppm.

9. The dehumidification method for electrical equipment with air chamber humidity detection according to claim 7 or 8, characterized in that In the second step, the vacuum operation specifically includes: opening the eighth valve to evacuate the system pressure; when the pressure in the gas chamber drops to normal pressure, closing the eighth valve, starting the vacuum pump, vacuuming the gas chamber to 133Pa, and continuing to pump for 10 minutes to 120 minutes, stopping the vacuum pump, recording the vacuum degree PA1 after 30 minutes, and recording the vacuum degree PB1 after standing for the required time; when PB1-PA1<133Pa, the vacuum operation is completed; or / and, in the third step, the nitrogen replacement operation specifically includes: recycling the purification unit and stopping the vacuum pump, setting the nitrogen filling pressure value, opening the third valve, and the nitrogen in the nitrogen cylinder enters the gas chamber along the fourth delivery pipeline through the vaporizer. When When the second pressure gauge displays a value of 0.12MPa, close the third valve, stop the nitrogen filling and replacement operation, and let it stand for the required time until the humidity value measured by the first online detection equipment stabilizes to 0 to 150ppm, and the nitrogen filling and replacement operation is completed; or / and, in the fourth step, open the eighth valve to evacuate the system pressure. When the air chamber pressure drops to normal pressure, close the eighth valve, start the vacuum pump, enable the emptying mode, and evacuate to 133Pa. Continue to evacuate for 10 to 120 minutes, stop the vacuum pump, and record the vacuum degree PA2 after 30 minutes. Let it stand for the required time and record the vacuum degree PB2. When PB2-PA2<133Pa, the emptying operation is completed.

10. The dehumidification method for electrical equipment with air chamber humidity detection according to claim 7, 8 or 9, characterized in that In the fifth step, when the system emptying operation is completed, the gas chamber needs to be refilled with sulfur hexafluoride. The specific operations of filling sulfur hexafluoride include: setting the sulfur hexafluoride filling pressure value, opening the second valve, and sulfur hexafluoride enters the gas chamber through the vaporizer and along the fourth transmission pipeline. When the second pressure gauge shows a pressure of 0 to 0.7 MPa, stop filling sulfur hexafluoride.

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