Sulfur hexafluoride and mixed gas on-site rapid gas supplementing equipment and sulfur hexafluoride and mixed gas on-site rapid gas supplementing method

Abstract

The invention discloses a sulfur hexafluoride and mixed gas on-site rapid gas supplementing device and method, and relates to the technical field of gas mixing and supplementing of GIL / GIS equipment, the sulfur hexafluoride and mixed gas on-site rapid gas supplementing device comprises a sulfur hexafluoride inflation unit, a nitrogen inflation unit, a gas supplementing main pipeline unit, a vacuumizing unit and a gas chamber gas return unit; the sulfur hexafluoride inflating unit and the nitrogen inflating unit are communicated with the gas supplementing main pipeline unit; and the vacuumizing unit is communicated with the air chamber air return unit and the air supply main pipeline unit. The device has the beneficial effects that the special sulfur hexafluoride inflating unit and the nitrogen inflating unit are arranged, and the two-position three-way valve is combined to control the proportion of two gases entering the gas supplementing main pipeline, so that the originally designed mixing proportion of sulfur hexafluoride and nitrogen can be maintained or recovered when the mixed gas is supplemented; and the problem that the concentration of sulfur hexafluoride is too high due to pure use of pure sulfur hexafluoride for gas supplementation is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of mixed gas replenishment of GIL / GIS equipment, in particular to a device and method for rapid on-site replenishment of sulfur hexafluoride and mixed gas. Background Art

[0002] Sulfur hexafluoride gas is widely used in the power industry due to its excellent insulation and arc-extinguishing properties. However, sulfur hexafluoride gas is a strong greenhouse gas and its emission is strictly prohibited. In order to reduce the absolute gas consumption of sulfur hexafluoride gas in the power industry, State Grid Corporation of China has gradually promoted the application of sulfur hexafluoride / nitrogen mixed gas in non-arc-extinguishing gas chambers, and arc-extinguishing gas chambers use sulfur hexafluoride gas.

[0003] During daily operation and maintenance, the maintenance personnel in the substation need to regularly test the pressure, purity (mixing ratio), trace water and other parameters of the gas chamber. For GIL / GIS equipment with reduced gas chamber pressure, it is necessary to replenish gas while analyzing the cause of the leakage to prevent low-pressure lockout protection. The maintenance personnel face the need to replenish gas in two different types of gas chambers. Arc extinguishing gas chambers such as circuit breakers need to be replenished with sulfur hexafluoride gas, and the mixed gas chamber of the GIL / GIS equipment needs to correct the replenishment concentration according to the measured mixing ratio. For the mixed gas replenishment process, it is necessary to first measure the concentration of the mixed gas and the replenishment pressure to calculate the replenishment concentration. However, due to the lack of special tools for mixed gas replenishment, complex manual measurements and calculations are required, so that when the mixing equipment is replenished, pure sulfur hexafluoride gas is usually replenished, which makes the sulfur hexafluoride concentration in the mixing equipment higher and higher, which is contrary to the filling of the mixing equipment with a 30% concentration of sulfur hexafluoride nitrogen mixed gas. Summary of the invention

[0004] In view of the above-mentioned prior art problems, the present invention is proposed.

[0005] The purpose of the present invention is to provide a sulfur hexafluoride and mixed gas on-site rapid gas replenishment device, which aims to solve the existing problem of how to accurately maintain or restore the original designed mixing ratio of sulfur hexafluoride and nitrogen when replenishing the gas chamber of sulfur hexafluoride / nitrogen mixed gas, and avoid the problem of gradual increase in sulfur hexafluoride concentration caused by lack of special tools during the gas replenishment process.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a sulfur hexafluoride and mixed gas on-site rapid gas replenishment equipment, which includes a sulfur hexafluoride charging unit, a nitrogen charging unit, a gas replenishment main line unit, a vacuum unit and a gas chamber return unit;

[0007] The sulfur hexafluoride charging unit and the nitrogen charging unit are connected to the air supply main line unit;

[0008] The vacuum pumping unit is connected to the air chamber air return unit and the air supply main line unit.

[0009] As a preferred solution of the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas of the present invention, the sulfur hexafluoride filling unit includes a first connecting pipe, a first gas interface arranged at one end of the first connecting pipe, a first pressure regulating valve arranged at the other end of the first connecting pipe, and a second connecting pipe arranged on the other side of the first pressure regulating valve.

[0010] As a preferred solution of the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas of the present invention, the nitrogen filling unit includes a third connecting pipe, a second gas interface arranged at one end of the third connecting pipe, a second pressure regulating valve arranged at the other end of the third connecting pipe, and a fourth connecting pipe arranged on the other side of the second pressure regulating valve.

[0011] As a preferred embodiment of the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas of the present invention, the gas replenishment main line unit includes a two-position three-way valve connecting the second connecting pipe with the fourth connecting pipe, a first gas replenishment main line connected to the two-position three-way valve, the second gas replenishment main line arranged on one side of the first gas replenishment main line, a laminar pressure difference controller arranged on one side of the second gas replenishment main line, a third gas replenishment main line arranged on one side of the laminar pressure difference controller, a gas replenishment solenoid valve arranged at the end of the third gas replenishment main line, a fourth gas replenishment main line arranged at one end of the gas replenishment solenoid valve, and a switch gas chamber interface arranged at the end of the fourth gas replenishment main line.

[0012] As a preferred embodiment of the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas of the present invention, the vacuum unit includes a first vacuum connection pipe connected to the first gas replenishment main line and the second gas replenishment main line, a first vacuum solenoid valve arranged at one end of the first vacuum connection pipe, a second vacuum connection pipe arranged at one side of the first vacuum solenoid valve, a third vacuum connection pipe connected to the second vacuum connection pipe, a second vacuum solenoid valve arranged at one end of the third vacuum connection pipe, a fourth vacuum connection pipe arranged at one side of the second vacuum solenoid valve, a fourth air chamber return gas connection pipe connected to the fourth vacuum connection pipe, a constant volume steel cylinder isolation solenoid valve arranged at the end of the fourth vacuum connection pipe, a constant volume steel cylinder connecting pipe arranged on one side of the constant volume steel cylinder isolation solenoid valve, a constant volume steel cylinder arranged at the end of the constant volume steel cylinder connecting pipe, and an air pump arranged at the end of the second vacuum connection pipe.

[0013] As a preferred embodiment of the on-site rapid air replenishment equipment for sulfur hexafluoride and mixed gas of the present invention, the air chamber return air unit includes a third air chamber return air connecting pipe connected to the first air replenishment main line and the second air replenishment main line, a first air chamber return air solenoid valve arranged at the end of the third air chamber return air connecting pipe, a second air chamber return air connecting pipe arranged on one side of the first air chamber return air solenoid valve, a first air chamber return air connecting pipe connected to the second air chamber return air connecting pipe, and a pressure transmitter arranged at the end of the first air chamber return air connecting pipe.

[0014] As a preferred solution of the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas of the present invention, wherein: the two-position three-way valve connects the second connecting pipe, the fourth connecting pipe and the first gas replenishment main line;

[0015] The two-position three-way valve can control the connection relationship between various pipelines.

[0016] As a preferred solution of the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas of the present invention, wherein: the fourth gas chamber return gas connecting pipe connects the third gas replenishment main line with the fourth vacuum connection pipe;

[0017] One end of the fourth air chamber return air connecting pipe is located between the laminar flow pressure difference controller and the air replenishment solenoid valve.

[0018] The beneficial effects of the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas of the present invention are as follows: by setting a special sulfur hexafluoride charging unit and a nitrogen charging unit, and combining a two-position three-way valve to control the ratio of the two gases entering the gas replenishment main pipeline, it can effectively ensure that the sulfur hexafluoride and nitrogen mixing ratio originally designed is maintained or restored when replenishing the mixed gas, thereby avoiding the problem of excessive sulfur hexafluoride concentration caused by simply using pure sulfur hexafluoride to replenish gas.

[0019] Another object of the present invention is to provide a method for replenishing sulfur hexafluoride gas chambers, which aims to solve the problem that existing sulfur hexafluoride gas chambers cannot replenish gas efficiently, purely and accurately.

[0020] In order to solve the above technical problems, the present invention also provides the following technical solutions: a method for replenishing sulfur hexafluoride gas chamber, comprising a sulfur hexafluoride and mixed gas on-site rapid gas replenishment device; and, S1: connecting a gas replenishment pipeline;

[0021] S2: Self-cleaning of air supply pipeline;

[0022] S3: Flushing the air supply pipeline with sulfur hexafluoride;

[0023] S4: replenishing air to the air replenishment chamber until the pressure of the air replenishment chamber reaches a preset air replenishment pressure value.

[0024] The beneficial effects of the sulfur hexafluoride gas chamber replenishment method of the present invention are as follows: by connecting the gas replenishment pipeline and performing self-cleaning and sulfur hexafluoride flushing, the purity of the pipeline is ensured and the influence of impurities on the gas chamber is avoided; by vacuuming the entire system, residual air or moisture is further eliminated to ensure the quality of gas replenishment; during the gas replenishment process, the laminar flow pressure difference controller and the pressure transmitter are used to monitor and adjust the inflation speed in real time, so that the pressure of the gas chamber to be replenished can reach the preset value steadily and accurately, thereby ensuring the stability and safety of the equipment operation.

[0025] Another object of the present invention is to provide a mixed gas chamber replenishment method, which aims to solve the problem of being unable to accurately calculate and control the ratio and volume of sulfur hexafluoride and nitrogen gases replenished during the sulfur hexafluoride / nitrogen mixed gas chamber replenishment process.

[0026] In order to solve the above technical problems, the present invention also provides the following technical solutions: a mixed gas chamber gas replenishment method, which includes sulfur hexafluoride and mixed gas on-site rapid gas replenishment equipment; and, S1: obtaining the rated chamber pressure P of the chamber to be replenished 额 The measured mixing ratio concentration σ in the gas chamber 测 ;

[0027] S2: Vacuum the system;

[0028] S3: effective volume of the air chamber to be replenished;

[0029] S4: Derivation of the concentration of the supplementary mixture σ 补 , and determine the amount of sulfur hexafluoride required to be supplemented according to the supplementary gas concentration V SF6补 and V N2补 .

[0030] The beneficial effects of the mixed gas chamber replenishment method of the present invention are: by accurately measuring the rated parameters, current state and effective volume of the gas chamber to be replenished, and combining scientific calculations to determine the specific amounts of sulfur hexafluoride and nitrogen gas required for replenishment, the accuracy and reliability of the replenishment process can be significantly improved; this method not only ensures that the concentration of the mixed ratio of sulfur hexafluoride and nitrogen in the gas chamber after replenishment is restored to the design value, but also reduces the risk of excessive or low sulfur hexafluoride concentration due to improper replenishment, thereby improving the operating safety and stability of power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1It is the principle diagram of the rapid air replenishment equipment in the present invention.

[0033] Figure 2 This is a system diagram of the rapid air replenishment equipment in the present invention. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0037] Example 1

[0038] Reference Figure 1 , which is the first embodiment of the present invention, provides a sulfur hexafluoride and mixed gas on-site rapid gas replenishment equipment, including a sulfur hexafluoride charging unit 100, a nitrogen charging unit 200, a gas replenishment main line unit 300, a vacuum unit 400 and an air chamber return unit 500; the sulfur hexafluoride charging unit 100 is connected to the nitrogen charging unit 200 and the gas replenishment main line unit 300; the vacuum unit 400 is connected to the air chamber return unit 500 and the gas replenishment main line unit 300.

[0039] In this embodiment, one end of the sulfur hexafluoride filling unit 100 is connected to the sulfur hexafluoride cylinder; the sulfur hexafluoride filling unit 100 can control the filling of sulfur hexafluoride into the system; and a pressure regulating valve is also provided between the sulfur hexafluoride filling units, thereby controlling the pressure of sulfur hexafluoride entering the system.

[0040] The nitrogen charging unit 200 and the sulfur hexafluoride charging unit 100 are two parallel branches; one end of the nitrogen charging unit 200 is connected to a pure nitrogen cylinder, and the nitrogen charging unit 200 can control the filling of nitrogen into the system; a pressure regulating valve is also provided in the nitrogen charging unit, so that the pressure of the nitrogen entering the system can be controlled; and when nitrogen and sulfur hexafluoride enter the system, they will be mixed inside the connected end.

[0041] The nitrogen filling unit 200 and the sulfur hexafluoride filling unit 100 are both connected to the air supply main line unit 300; and a three-way valve is installed at the connecting position; it can ensure that a certain passage can be formed between nitrogen or sulfur hexafluoride and the air supply main line; thereby, it is possible to distinguish the gas entering the system.

[0042] The vacuum unit 400 is connected to the internal pipeline of the system; by inputting vacuum gas into the system through an air pump, residual impurities, air and moisture in the pipeline can be discharged from the system pipeline, thereby ensuring the cleanliness of the system pipeline.

[0043] The air chamber return unit 500 is mainly used for the original sulfur hexafluoride and its mixed gas in the air chamber that may be extracted during the vacuuming or flushing process; through the air chamber return unit, these gases can be collected and reused in the system, thereby reducing the use of new sulfur hexafluoride, saving costs, and reducing the impact on the environment;

[0044] At the same time, the air chamber return unit can help maintain the pressure balance inside the system; when calculating the effective volume of the air chamber to be replenished, the gas in the air chamber needs to be transferred to the constant volume cylinder 410 to achieve a pressure balance state; this process relies on the valves and pipelines in the air chamber return unit to achieve.

[0045] In summary, by setting up a special sulfur hexafluoride charging unit and a nitrogen charging unit, and combining a two-position three-way valve to control the ratio of the two gases entering the main air supply line, it can effectively ensure that the original designed sulfur hexafluoride and nitrogen mixing ratio is maintained or restored when replenishing the mixed gas, avoiding the problem of excessive sulfur hexafluoride concentration caused by simply using pure sulfur hexafluoride to replenish the gas.

[0046] Example 2

[0047] Reference Figures 1-2 , which is a second embodiment of the present invention, includes a sulfur hexafluoride filling unit 100 including a first connecting pipe 101, a first gas interface 102 arranged at one end of the first connecting pipe 101, a first pressure regulating valve 103 arranged at the other end of the first connecting pipe 101, and a second connecting pipe 104 arranged on the other side of the first pressure regulating valve 103.

[0048] In this embodiment, the sulfur hexafluoride filling unit 100 is a key component of the entire sulfur hexafluoride and mixed gas on-site rapid gas replenishment equipment. It is responsible for introducing pure sulfur hexafluoride gas from an external cylinder into the system and ensuring that the gas can enter the gas replenishment chamber safely and stably by adjusting the pressure.

[0049] It should be noted that the first connecting pipe 101 is used to connect the sulfur hexafluoride gas interface and the first pressure regulating valve 103 to ensure smooth flow of gas during the transmission process;

[0050] The first gas interface 102 is located at one end of the first connecting pipe 101 and is used to connect to an external sulfur hexafluoride cylinder. The interface is designed to have good sealing properties to prevent gas leakage;

[0051] The first pressure regulating valve 103 is arranged at the other end of the first connecting pipe 101, and its main function is to adjust the pressure of the sulfur hexafluoride gas to ensure that the gas is in a safe and controllable state when entering the system; by adjusting the pressure regulating valve, the flow and pressure of the sulfur hexafluoride gas can be controlled to meet different gas replenishment needs.

[0052] The second connecting pipe 104 is located at the other side of the first pressure regulating valve 103, and continues to guide the pressure-regulated sulfur hexafluoride gas to the sulfur hexafluoride side interface of the two-position three-way valve, thereby realizing the delivery of sulfur hexafluoride gas to the system.

[0053] Specifically, the first gas interface 102 is tightly connected to the external sulfur hexafluoride cylinder to ensure no leakage; the valve on the sulfur hexafluoride cylinder is opened to allow the sulfur hexafluoride gas to flow into the system through the first connecting pipe 101; the pressure of the sulfur hexafluoride gas is adjusted by the first pressure regulating valve 103. According to actual needs, a suitable pressure value is set to ensure that the gas will not cause safety hazards due to excessive pressure when entering the system, nor will it affect the gas replenishment efficiency due to too low pressure; the sulfur hexafluoride gas after pressure regulation is transported to the sulfur hexafluoride side interface of the two-position three-way valve through the second connecting pipe 104, and then it is selected whether to directly enter the gas replenishment main line or perform further processing such as flushing according to the operation requirements; during the whole process, the pressure change of the sulfur hexafluoride gas can be monitored in real time by equipment such as pressure transmitters to ensure the safety and accuracy of the gas replenishment process.

[0054] Furthermore, the nitrogen charging unit 200 includes a third connecting pipe 201 , a second gas interface 202 arranged at one end of the third connecting pipe 201 , a second pressure regulating valve 203 arranged at the other end of the third connecting pipe 201 , and a fourth connecting pipe 204 arranged at the other side of the second pressure regulating valve 203 .

[0055] In this embodiment, the nitrogen filling unit 200 is another key part of the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gases. It is responsible for introducing high-purity nitrogen from an external source into the system and ensuring that the nitrogen can enter the gas replenishment chamber safely and stably by adjusting the pressure. The design of this unit is similar to that of the sulfur hexafluoride filling unit, but is aimed at the processing and transportation of nitrogen.

[0056] It should be noted that the third connecting pipe 201 is used to connect the second gas interface 202 and the second pressure regulating valve 203 to ensure smooth flow of nitrogen during the transmission process;

[0057] The second gas interface 202 is located at one end of the third connecting pipe 201 and is used to connect to an external high-purity nitrogen source; this interface is designed to have good sealing properties to prevent gas leakage;

[0058] The second pressure regulating valve 203 is disposed at the other end of the third connecting pipe 201, and its main function is to adjust the pressure of the nitrogen to ensure that the gas is in a safe and controllable state when entering the system; by adjusting the pressure regulating valve, the flow and pressure of the nitrogen can be controlled to meet different gas replenishment requirements;

[0059] The fourth connecting pipe 204 is located at the other side of the second pressure regulating valve 203, and continues to guide the pressure-regulated nitrogen to the nitrogen side interface of the two-position three-way valve, thereby realizing the delivery of nitrogen to the system.

[0060] Specifically, the second gas interface 202 is tightly connected to the external high-purity nitrogen source to ensure no leakage; the valve on the nitrogen source is opened to allow nitrogen to flow into the system through the third connecting pipe 201; the pressure of the nitrogen is adjusted by the second pressure regulating valve 203. According to actual needs, a suitable pressure value is set to ensure that the gas will not cause safety hazards due to excessive pressure when entering the system, nor will it affect the gas replenishment efficiency due to too low pressure; the nitrogen after pressure regulation is transported to the nitrogen side interface of the two-position three-way valve through the fourth connecting pipe 204, and then it is selected whether to directly enter the gas replenishment main line or to be further processed according to the operation requirements; in the whole process, the pressure change of nitrogen can be monitored in real time by equipment such as pressure transmitters to ensure the safety and accuracy of the gas replenishment process.

[0061] Furthermore, the air supply main line unit 300 includes a two-position three-way valve 301 connecting the second connecting pipe 104 and the fourth connecting pipe 204, a first air supply main line 302 connected to the two-position three-way valve 301, a second air supply main line 303 arranged on one side of the first air supply main line 302, a laminar pressure difference controller 304 arranged on one side of the second air supply main line 303, a third air supply main line 305 arranged on one side of the laminar pressure difference controller 304, an air supply solenoid valve 306 arranged at the end of the third air supply main line 305, a fourth air supply main line 307 arranged at one end of the air supply solenoid valve 306, and a switch air chamber interface 308 arranged at the end of the fourth air supply main line 307.

[0062] In this embodiment, the main gas supply line unit 300 is the core part of the on-site rapid gas supply equipment for sulfur hexafluoride and mixed gas. It is responsible for guiding sulfur hexafluoride and nitrogen from their respective charging units to the gas supply chamber, and ensures that the gas can enter the gas chamber safely and accurately through a series of control devices.

[0063] It should be noted that the two-position three-way valve 301: connects the second connecting pipe 104 and the fourth connecting pipe 204, and is used to selectively connect the sulfur hexafluoride or nitrogen source; this valve can switch the gas source as needed to ensure that the correct gas enters the system;

[0064] The first gas supply main line 302 is connected to the common outlet of the two-position three-way valve 301 and serves as the main gas transmission path;

[0065] The second main gas supply line 303 is disposed on one side of the first main gas supply line 302 to further guide the gas flow direction;

[0066] The laminar flow pressure difference controller 304 is located on one side of the second gas supply main line 303, and is used to control the speed, pressure and gas volume metering of the gas flow, to ensure that the gas volume is accurate and the pressure is uniform and stable when the gas enters the gas chamber;

[0067] The third main gas supply line 305 is disposed on one side of the laminar pressure difference controller 304 to continue to guide the gas flow direction;

[0068] The gas replenishment solenoid valve 306 is located at the end of the third gas replenishment main line 305, and is used to control the start and stop of gas flow into the gas chamber to ensure accurate control of the gas replenishment process;

[0069] The fourth gas supply main line 307 is disposed at one end of the gas supply solenoid valve 306 and serves as the final gas transmission path;

[0070] The switch air chamber interface 308 is located at the end of the fourth air supply main line 307 and is directly connected to the GIS / GIL air chamber to be supplied with air, ensuring that the gas can smoothly enter the air chamber.

[0071] Specifically, sulfur hexafluoride or a mixed gas is selected as the inflating gas through the two-position three-way valve 301; different gas sources can be switched according to actual needs; then the selected gas is guided to the laminar flow pressure difference controller 304 through the first inflating main line 302 and the second inflating main line 303; the gas pressure and flow rate are adjusted by the laminar flow pressure difference controller 304 to ensure that the gas enters the gas chamber at an appropriate speed and pressure to avoid safety problems caused by pressure fluctuations; then the gas reaches the inflating solenoid valve 306 through the third inflating main line 305; by controlling the opening and closing of the inflating solenoid valve 306, the time and amount of gas entering the gas chamber can be accurately controlled; finally, the gas enters the GIS / GIL gas chamber to be inflated through the fourth inflating main line 307 and the switch gas chamber interface 308 to complete the inflating process.

[0072] Furthermore, the vacuum unit 400 includes a first vacuum connection pipe 401 connected to the first air supply main line 302 and the second air supply main line 303, a first vacuum solenoid valve 402 arranged at one end of the first vacuum connection pipe 401, a second vacuum connection pipe 403 arranged at one side of the first vacuum solenoid valve 402, a third vacuum connection pipe 404 connected to the second vacuum connection pipe 403, and a second vacuum solenoid valve 404 arranged at one end of the third vacuum connection pipe 404. 5. A fourth vacuum pumping connecting pipe 406 arranged on one side of the second vacuum pumping solenoid valve 405, a fourth air chamber return air connecting pipe 407 connected to the fourth vacuum pumping connecting pipe 406, a constant volume steel cylinder isolation solenoid valve 408 arranged at the end of the fourth vacuum pumping connecting pipe 406, a constant volume steel cylinder connecting pipe 409 arranged on one side of the constant volume steel cylinder isolation solenoid valve 408, a constant volume steel cylinder 410 arranged at the end of the constant volume steel cylinder connecting pipe 409, and an air pump 411 arranged at the end of the second vacuum pumping connecting pipe 403.

[0073] In this embodiment, the vacuum unit 400 is an important component of the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas. Its main function is to remove air, moisture and other impurities in the system through the vacuum process to ensure the cleanliness of the system before gas replenishment;

[0074] It should be noted that the first vacuum connection pipe 401 connects the first gas supply main line 302 and the second gas supply main line 303 as a part of the vacuum path;

[0075] The first vacuuming solenoid valve 402 is disposed at one end of the first vacuuming connecting pipe 401 and is used to control the start and stop of the vacuuming process;

[0076] The second vacuum connection pipe 403 is connected to one side of the first vacuum solenoid valve 402 to continue to guide the gas flow;

[0077] The third vacuum connection pipe 404 is connected to the second vacuum connection pipe 403, further expanding the vacuum path;

[0078] The second vacuum solenoid valve 405 is disposed at one end of the third vacuum connection pipe 404 to assist in controlling the vacuum process;

[0079] The fourth vacuum connection pipe 406 is connected to the third vacuum connection pipe 404 to continue to guide the gas flow;

[0080] The fourth air chamber return gas connection pipe 407 is connected to the fourth vacuum connection pipe 406 and is used to recover the gas exhausted from the air chamber;

[0081] The constant volume steel cylinder isolation solenoid valve 408 is disposed at the end of the fourth vacuum pumping connecting pipe 406, and is used to isolate the constant volume steel cylinder 410 during the vacuum pumping process;

[0082] The constant volume cylinder connecting pipe 409 is connected to one side of the constant volume cylinder isolation solenoid valve 408, and the constant volume cylinder 410 is connected to the system;

[0083] The constant volume steel cylinder 410 is located at the end of the constant volume steel cylinder connecting pipe 409 and is used to store the flushed sulfur hexafluoride gas or other gases that need to be recovered;

[0084] The air pump 411 is disposed at the end of the second vacuum connection pipe 403 to provide the power required for vacuuming.

[0085] Specifically, when setting up the work, first ensure that all valves are in a closed state and prepare for the vacuum operation; start the air pump 411 to provide power for the entire vacuum process, and then open the first vacuum solenoid valve 402, the second vacuum solenoid valve 405 and the constant volume cylinder isolation solenoid valve 408 to form a closed but ventilated space inside the system; the air pump 411 starts to work, and extracts air and other non-target gas components in the system through the first vacuum connection pipe 401, the second vacuum connection pipe 403, the third vacuum connection pipe 404 and the fourth vacuum connection pipe 406; during this process, the constant volume cylinder isolation solenoid valve 408 remains open to allow the flushed sulfur hexafluoride gas to enter the constant volume cylinder 410 for storage;

[0086] When the pressure in the system reaches the preset value, stop the air pump 411 and close all open valves; close the isolating solenoid valve 408 of the constant volume cylinder to ensure that the gas in the constant volume cylinder 410 will not be re-inhaled into the system; check whether the system has reached the required high vacuum degree, and after confirming that there is no leakage, prepare for the next gas replenishment operation;

[0087] Preferably, the pressure changes in the system are monitored in real time by a monitoring device such as a pressure transmitter to ensure that the vacuum process reaches a preset vacuum degree; if necessary, the vacuum effect can be optimized by adjusting the operating parameters of the air pump.

[0088] Furthermore, the air chamber return air unit 500 includes a third air chamber return air connecting pipe 501 connected to the first air supply main line 302 and the second air supply main line 303, a first air chamber return air connecting pipe 501 arranged at the end of the third air chamber return air connecting pipe 501, a second air chamber return air connecting pipe 503 arranged on one side of the first air chamber return air solenoid valve 502, a first air chamber return air connecting pipe 504 connected to the second air chamber return air connecting pipe 503, and a pressure transmitter 505 arranged at the end of the first air chamber return air connecting pipe 504.

[0089] In this embodiment, the gas chamber return unit 500 plays a key role in the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas. It is mainly responsible for guiding the gas in the gas chamber to the constant volume cylinder, detecting the pressure change after pressure equalization, and calculating the effective volume V of the gas chamber to be replenished according to the gas state equation and the law of conservation of energy. 气室 .

[0090] It should be noted that the third air chamber return gas connection pipe 501 is connected to the first air supply main line 302 and the second air supply main line 303, serving as the main path for gas reflux;

[0091] The first air chamber return solenoid valve 502 is disposed at the end of the third air chamber return connection pipe 501, and is used to control the flow of gas from the air chamber to the system;

[0092] The second air chamber return gas connection pipe 503 is connected to one side of the first air chamber return gas solenoid valve 502 to further guide the gas flow direction;

[0093] The first air chamber return gas connecting pipe 504 is connected to the second air chamber return gas connecting pipe 503 to continue to guide the gas flow;

[0094] The pressure transmitter 505 is disposed at the end of the first air chamber return air connecting pipe 504 and is used to monitor the pressure change in the air chamber in real time.

[0095] Specifically, the first air chamber return solenoid valve 502 is opened to allow the gas in the air chamber to flow out through the third air chamber return connecting pipe 501; the gas in the air chamber is guided into the system through the first air chamber return solenoid valve 502, the second air chamber return connecting pipe 503 and the first air chamber return connecting pipe 504; in this process, the gas flow rate can be controlled by adjusting the first air chamber return solenoid valve 502 to ensure a smooth return process;

[0096] The pressure change in the gas chamber is monitored in real time by the pressure transmitter 505; this helps to determine whether the gas in the gas chamber has been pressure-balanced; when the gas in the gas chamber and the constant volume cylinder 410 have been pressure-balanced, the system reaches a new pressure balance point; at this time, the formula can be used:

[0097]

[0098] Among them, V 标 is the effective volume of the constant volume cylinder 410; and P 1前 and P 1后 Respectively represent the pressure values ​​in the air-filling chamber before and after the measurement; V 气室 It is the effective volume of the air chamber to be replenished.

[0099] When the gas in the gas chamber is exhausted and the system reaches a new pressure balance, close the first gas chamber return solenoid valve 502 to stop the gas reflux; check the reading of the pressure transmitter 505 and record it to prepare for the subsequent gas replenishment operation.

[0100] Furthermore, the two-position three-way valve 301 connects the second connecting pipe 104 , the fourth connecting pipe 204 and the first main air supply line 302 ; the two-position three-way valve 301 can control the connection relationship between the various lines.

[0101] In this embodiment, the two-position three-way valve 301 plays a key role in the on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas. It is responsible for connecting the second connecting pipe 104, the fourth connecting pipe 204 and the first gas replenishment main line 302, and can control the connectivity between the various pipelines.

[0102] It should be noted that the two-position three-way valve 301 can switch different gas sources, that is, sulfur hexafluoride gas or nitrogen gas can be selected to enter the system; by changing the position of the valve, the connection from the sulfur hexafluoride charging unit to the first gas supply main line 302, or from the nitrogen charging unit to the first gas supply main line 302 can be achieved;

[0103] The valve can control the flow direction of the gas to ensure that the gas enters the system along a predetermined path; when sulfur hexafluoride gas needs to be supplemented, the two-position three-way valve 301 will connect the second connecting pipe 104 with the first gas supply main line 302; and when nitrogen needs to be supplemented, the fourth connecting pipe 204 will be connected with the first gas supply main line 302;

[0104] The two-position three-way valve 301 can also isolate the corresponding pipeline when a certain gas is not needed to prevent the gas from mixing into other pipelines, thereby ensuring the purity and safety of the system;

[0105] Since the two-position three-way valve 301 has selectivity and controllability, it greatly improves the operational flexibility of the entire gas supply system, allowing operation and maintenance personnel to flexibly select different gases for gas supply operations according to actual needs.

[0106] Specifically, the two-position three-way valve 301 is in a closed state, and all pipelines are not connected;

[0107] When it is necessary to supplement sulfur hexafluoride gas, adjust the two-position three-way valve 301 to connect the second connecting pipe 104 with the first gas supply main line 302, and close the channel of the fourth connecting pipe 204 at the same time;

[0108] When nitrogen needs to be supplemented, the two-position three-way valve 301 is adjusted to connect the fourth connecting pipe 204 with the first main gas supply line 302, and the channel of the second connecting pipe 104 is closed at the same time;

[0109] When the gas replenishment operation is not required, the two-position three-way valve 301 can isolate all pipelines to prevent any gas from flowing into the system.

[0110] Furthermore, the fourth air chamber return air connecting pipe 407 connects the third air supply main line 305 with the fourth vacuum connection pipe 406 ; one end of the fourth air chamber return air connecting pipe 407 is arranged between the laminar pressure difference controller 304 and the air supply solenoid valve 306 .

[0111] In this embodiment, the fourth gas chamber return gas connecting pipe 407 serves to connect the third gas supply main line 305 and the fourth vacuum connecting pipe 406 in the on-site rapid gas supply equipment for sulfur hexafluoride and mixed gas, and is specifically located between the laminar pressure difference controller 304 and the gas supply solenoid valve 306.

[0112] It should be noted that when the system is vacuuming or flushing, the fourth air chamber return connection pipe 407 allows the gas exhausted from the air chamber to be replenished to return to the vacuum unit 400 through this path; this can recycle the gas, reduce waste, and ensure the cleanliness of the system.

[0113] The pressure balance between the gas chamber and the system can be achieved during the gas replenishment process through the fourth gas chamber return connection pipe 407. When the effective volume of the gas chamber needs to be measured, the gas in the gas chamber can be transferred to the constant volume cylinder 410 through this pipe to achieve a pressure balance state;

[0114] After the gas replenishment operation is completed, if the gas in the gas chamber needs to be adjusted or redistributed, the fourth gas chamber return gas connection pipe 407 can provide a channel so that the gas can flow between different parts to help maintain the stability and consistency of the system;

[0115] By cooperating with the laminar pressure difference controller 304 and the air supply solenoid valve 306, the fourth air chamber return air connecting pipe 407 helps to monitor and control the pressure changes in the air chamber in real time, ensuring that the pressure during the air supply process meets the requirements.

[0116] Specifically, when the system is evacuating a vacuum, the relevant valves are opened to allow the gas in the air chamber to enter the vacuum unit 400 through the fourth air chamber return air connecting pipe 407 and be pumped out by the air pump 411; when calculating the effective volume of the air chamber, the first air chamber return air solenoid valve 502 is opened, and the gas in the air chamber is transferred to the constant volume cylinder 410 through the fourth air chamber return air connecting pipe 407 until the pressure is balanced; during the gas replenishment process, if it is necessary to adjust the gas concentration or pressure in the air chamber, the gas can be redistributed through the fourth air chamber return air connecting pipe 407 to ensure that the final gas concentration meets the requirements.

[0117] In summary, through intelligent algorithms and precise measuring devices, the required amount of sulfur hexafluoride or nitrogen can be accurately calculated to ensure that the gas concentration after gas replenishment meets the operating index requirements of high-voltage switchgear; the use of laminar pressure differential controllers and pressure transmitters ensures pressure and flow control during the gas replenishment process and improves the accuracy of gas replenishment; through precise calculation and control, unnecessary use of sulfur hexafluoride gas is reduced, costs are reduced, and at the same time, the emission of strong greenhouse gases is reduced, which meets environmental protection requirements; the gas recovery mechanism allows the sulfur hexafluoride gas after flushing to be reused, further saving resources.

[0118] Example 3

[0119] This is the third embodiment of the present invention, which further provides a method for replenishing sulfur hexafluoride gas chambers; comprising, S1: connecting a gas replenishment pipeline; specifically, the first gas interface 102 is connected to the sulfur hexafluoride cylinder, and the switch gas chamber interface 308 is connected to the gas chamber to be replenished;

[0120] Connect the first gas interface 102 to the sulfur hexafluoride cylinder; ensure that the interface is well sealed and leak-free, so as to ensure the purity and safety of the sulfur hexafluoride gas during transmission;

[0121] Connect the switch air chamber interface 308 to the air chamber that needs to be supplemented with gas; similarly, ensure that the connection between the interfaces is tight and leak-free to prevent outside air or impurities from entering the air chamber and affecting the performance of the equipment.

[0122] Good pipeline connections ensure a smooth gas flow path, reducing interruptions in the gas replenishment process due to leakage or other factors, thereby improving the efficiency of the overall gas replenishment operation.

[0123] Tight interface connections to prevent external contaminants from entering are essential for maintaining the high purity of sulfur hexafluoride and its mixed gases, which is very important for maintaining good insulation and arc extinguishing performance inside electrical equipment such as GIS / GIL.

[0124] S2: Self-cleaning of the air supply pipeline; After connecting the air supply pipeline in the first step, the next step is to perform self-cleaning of the air supply pipeline; this process is designed to ensure that the inside of the pipeline is clean and free of impurities, preparing for the subsequent safe and efficient replenishment of sulfur hexafluoride or mixed gas.

[0125] Specifically, first turn on the air pump 411, which will serve as the power source for the entire vacuum pumping process; then open the sulfur hexafluoride side channel of the two-position three-way valve 301, as well as the air replenishment solenoid valve 306, the first vacuum pumping solenoid valve 402, the second vacuum pumping solenoid valve 405 and the constant volume cylinder isolation solenoid valve 408; the opening of these valves allows a closed but ventilated space to be formed inside the system, thereby ensuring the effectiveness of the vacuum pumping process.

[0126] Then a reasonable vacuuming time is preset, preferably 30 minutes; this time length is enough to allow the air and other possible impurities in the system to be fully discharged; with the above preparations ready, the air pump starts working to extract the air and other non-target gases in the pipeline and the air replenishment chamber through the opened pipeline network; this step is crucial to remove potential pollutants such as moisture and dust, because they may reduce the quality of sulfur hexafluoride gas or its mixture, thereby affecting the performance and life of the power equipment.

[0127] When the preset duration of 30 minutes is reached, the air pump 411 is stopped and all previously opened valves are closed; at this time, the entire air supply pipeline should be in a relatively high vacuum state, that is, the pipeline contains almost no external gas components.

[0128] By implementing such a self-cleaning procedure, the safety and efficiency of the gas replenishment operation can be significantly improved, while also reducing the impact on the environment. In addition, this step also lays the foundation for the subsequent precise control of the concentration ratio of the replenished gas, which helps to achieve a more accurate gas replenishment effect and ensure the stable operation of the power system.

[0129] S3: Flushing the air supply pipeline with sulfur hexafluoride; After completing the self-cleaning of the air supply pipeline, the next step is to flush the pipeline with sulfur hexafluoride gas; this process is designed to further ensure the purity of the internal environment of the pipeline, and to control the pressure to ensure that the inside of the pipeline is in a balanced state during the gas introduction process, so as to prepare for the subsequent precise replenishment of sulfur hexafluoride or mixed gas.

[0130] Specifically, first open the valve of the sulfur hexafluoride cylinder connected to the first connecting pipe 101 to allow the sulfur hexafluoride gas to enter the system; use the first pressure regulating valve 103 to adjust and preset the residual pressure of the sulfur hexafluoride cylinder to ensure that the gas enters the system at a safe and controllable speed; this step is crucial to avoid safety problems caused by excessive inlet pressure.

[0131] Then, the laminar flow pressure difference controller 304 is activated, which will adjust the flow speed and direction of the sulfur hexafluoride gas according to the set value to ensure that the entire flushing process proceeds smoothly while maintaining the pressure balance in the pipeline; the gas replenishment solenoid valve 306 and the constant volume cylinder isolation solenoid valve 408 are opened to allow the sulfur hexafluoride gas to pass smoothly through the pipeline to the constant volume cylinder 410.

[0132] Then, the sulfur hexafluoride gas begins to circulate in the entire pipeline system, and the pipeline is cleaned again to remove possible trace amounts of air or other non-target gas components; during this period, the flushed sulfur hexafluoride gas is collected in the constant volume cylinder 410.

[0133] Then, the pressure change in the constant volume cylinder 410 is continuously monitored. When it reaches the preset pressure value of 0.5MPa, it indicates that the flushing has been fully completed. At this time, all relevant valves are closed and the flushing process is stopped. It should be noted that the set target pressure should be lower than the initial residual pressure of the sulfur hexafluoride cylinder to ensure safety during the flushing process.

[0134] By flushing the pipeline in advance, residues or impurities can be effectively removed, ensuring a more accurate gas replenishment process, which helps achieve the expected gas concentration ratio; a clean and pollution-free pipeline environment helps maintain good insulation and arc extinguishing capabilities of electrical equipment and extend its service life; reasonable control of pressure during the flushing process prevents the risk of leakage due to high pressure and improves the safety of operations; by pre-flushing and maintaining a balanced pressure inside the pipeline, the subsequent gas replenishment process can be accelerated, improving overall work efficiency.

[0135] S4: replenishing air to the air chamber to be replenished until the pressure of the air chamber to be replenished reaches a preset air replenishment pressure value; after completing the self-cleaning and flushing of the pipeline, the next step is the actual air replenishment operation for the air chamber to be replenished.

[0136] Specifically, firstly, the valve of the gas chamber to be replenished is opened so that the system can fill the gas chamber with sulfur hexafluoride gas; the pressure transmitter 505 is used to measure the pressure density of the sulfur hexafluoride gas in the gas chamber to be replenished to determine how much gas is actually needed to reach the rated working state.

[0137] Then, adjust the laminar pressure difference controller 304 to the constant pressure gas replenishment mode, and set the preset gas replenishment pressure value according to the rated working pressure of the gas chamber to be replenished; open the gas replenishment solenoid valve 306, and at the same time close the first gas chamber return gas solenoid valve 50214, the first vacuum solenoid valve 402, the second vacuum solenoid valve 405 and the constant volume cylinder isolation solenoid valve 408 to ensure that sulfur hexafluoride gas can directly enter the gas chamber to be replenished.

[0138] Then, as the air replenishment process starts, the laminar flow pressure difference controller 304 will automatically adjust the inflation speed according to the pressure feedback information received from the pressure transmitter 505 to ensure that the target pressure is reached smoothly and effectively; when the pressure value displayed by the pressure transmitter 505 is close to the preset air replenishment pressure value, the laminar flow pressure difference controller 304 will gradually reduce the inflation speed until it stops, and then stand for a period of time, such as 20 seconds, to observe the pressure changes.

[0139] Finally, if the pressure is found to be lower than the preset value during the static period, the air replenishment will continue until the requirement is met; once it is confirmed that the pressure has reached or exceeded the preset value, the air replenishment will be stopped immediately and the relevant valves such as the air replenishment solenoid valve 306 and the laminar flow pressure difference controller 304 will be closed.

[0140] Step 1: Ensure that the first connecting pipe 101 is connected to the sulfur hexafluoride cylinder, and the switch gas chamber interface 308 is connected to the gas chamber to be replenished, ensuring a tight connection without leakage.

[0141] Step 2: Start the air pump 411 and related valves to thoroughly evacuate the entire air supply pipeline to remove possible impurities in the pipeline.

[0142] Step three: Use sulfur hexafluoride gas to flush the cleaned pipeline again to further improve the purity inside the pipeline and prepare for subsequent precise gas replenishment.

[0143] Step 4: While ensuring that the pipeline is clean and the pressure is balanced, accurately add sulfur hexafluoride gas to the gas chamber to be replenished until the internal pressure reaches the predetermined working standard.

[0144] In summary, the present invention provides an efficient and safe method to meet the needs of rapid on-site gas replenishment of sulfur hexafluoride and its mixed gas, which not only simplifies the complexity brought by traditional manual calculation and operation, but also improves the accuracy and efficiency of the gas replenishment process, which is of great significance to the stable operation of the power system.

[0145] Example 4

[0146] This is the fourth embodiment of the present invention, which further provides a mixed gas chamber gas replenishment method; comprising: S1: obtaining the rated chamber pressure P of the chamber to be replenished 额 The measured mixing ratio concentration σ in the gas chamber 测 Before quickly replenishing sulfur hexafluoride and its mixed gas on site, it is first necessary to accurately obtain the relevant parameters and current status of the gas chamber to be replenished.

[0147] Specifically, first, determine the rated working conditions of the air chamber to be replenished; according to the technical manual or relevant specifications provided by the equipment manufacturer, confirm the pressure value that the air chamber to be replenished should maintain during normal operation, that is, the rated pressure; this value is crucial to ensure the safety and performance of the equipment.

[0148] Also based on manufacturer guidelines or industry standards, the ideal mixture ratio of sulfur hexafluoride and nitrogen or other inert gas in the gas chamber is determined; this helps to subsequently calculate the correct amount of gas to restore optimal working conditions.

[0149] Then, the actual effective volume of the constant volume steel cylinder 410 used to store the flushed sulfur hexafluoride gas is measured and recorded in advance; this data will be used to assist in calculating the amount of gas required to be supplemented in subsequent steps.

[0150] Then, measure the current status of the gas chamber to be replenished; use appropriate detection instruments such as a gas analyzer to measure the ratio of the existing sulfur hexafluoride gas to nitrogen or other gases in the gas chamber to be replenished; use pressure transmitters 505 and other equipment to directly measure the real-time pressure value in the gas chamber to be replenished.

[0151] S2: System vacuuming; After obtaining the rated parameters and current status of the gas chamber to be replenished, the next step is to thoroughly vacuum the entire system; this process is designed to remove air, moisture and other possible impurities in the system to ensure the purity of the gas in the subsequent gas replenishment operation.

[0152] Specifically, first turn on the air pump 411, which will serve as the power source for the entire vacuuming process; open the first air chamber return solenoid valve 502 to allow the residual gas in the air chamber to be discharged through the return air pipeline; open the air replenishment solenoid valve 306 so that sulfur hexafluoride or mixed gas can smoothly enter the system in future steps; start the first vacuum solenoid valve 402 and the second vacuum solenoid valve 405, which are responsible for controlling the gas flow path from the system to the vacuuming equipment such as the air pump; open the constant volume cylinder isolation solenoid valve 408, which can ensure that all parts of the entire system, including the constant volume cylinder 410, are in a vacuum state.

[0153] Then, as all the above valves are opened, the air pump 411 starts to work and extracts air and other non-target gases from the system; the entire vacuuming process lasts for a preset time of 30 minutes, which is sufficient to ensure that the required high vacuum degree is achieved inside the system.

[0154] Then, during the entire vacuuming process, it is necessary to pay close attention to the system status to ensure that no leakage occurs; once the predetermined time point is reached, the air pump 411 is stopped and all previously opened solenoid valves are closed.

[0155] S3: The effective volume of the chamber to be replenished; after the system is evacuated, the next step is to accurately measure the effective volume of the chamber to be replenished. This process is crucial for the subsequent precise control of the amount of gas replenished.

[0156] Specifically, first open the valve of the gas chamber to be replenished to prepare for volume measurement; use the pressure transmitter 505 to record the current pressure P of the mixed gas in the gas chamber to be replenished. 1前 .

[0157] Then, the first air chamber return solenoid valve 502 is opened to allow the mixed gas in the air chamber to flow out through the return pipeline; at the same time, the constant volume cylinder isolation solenoid valve 408 is opened to allow the gas to enter the known effective volume V through the laminar flow pressure difference controller 304. 标 The constant volume cylinder 410.

[0158] Then, while the gas is being transferred from the replenishment chamber to the constant volume cylinder 410, observe the reading of the pressure transmitter 505 until it stabilizes; this means that the pressure between the two parts has reached a state of equilibrium, and the new equilibrium pressure P can be recorded at this time. 1后 .

[0159] According to the gas state equation and the law of conservation of energy, the effective volume V of the gas chamber to be replenished is calculated using the following relationship: 气室 :

[0160] P 1前 ×V 气室 =P 1后 (V 气室 +V 标 ) (1-1)

[0161] From this we can deduce:

[0162]

[0163] Among them, V 标 is the effective volume of the constant volume cylinder 410; and P 1前 and P 1后 They represent the pressure values ​​in the air-replenishing chamber before and after the measurement respectively.

[0164] S4: Derivation of the concentration of replenishing qi σ 补 ; After determining the effective volume of the gas chamber to be replenished, the next step is to calculate the specific concentration of sulfur hexafluoride gas that needs to be replenished σ 补 ; This process is based on Dalton's law of partial pressure and the gas state equation.

[0165] Specifically, according to the known condition P 1后 and the measured mixing ratio σ 测 , use formula (1-3) to calculate the partial pressure of sulfur hexafluoride under current conditions:

[0166] P SF6前 =P 1后 ×σ 测 (1-3)

[0167] Utilize rated pressure P 额 and rated mixing ratio σ 额 Determine the partial pressure of sulfur hexafluoride under ideal conditions by (1-4):

[0168] P SF6后 =P 额 ×σ 额 (1-4)

[0169] In order to restore to the rated working state, the sulfur hexafluoride partial pressure that needs to be increased is:

[0170] PSF6补 =P SF6额 -P SF6前 (1-5)

[0171] Based on the total pressure difference P before and after the air replenishment in the air replenishment chamber 额 -P 1后 , we can get the required sulfur hexafluoride gas concentration σ 补 :

[0172]

[0173] According to the effective volume V of the air chamber to be replenished 气室 And the calculated gas concentration σ 补 , combined with the pressure difference P before and after gas replenishment 额 -P 1后 , we can get:

[0174] V SF6补 =V 气室 ×σ 补 (P 额 -P 1后 ) (1-7)

[0175] Similarly, the nitrogen replenishment is calculated using the remaining ratio:

[0176] V N2补 =V 气室 ×(100-σ 补 )×(P 额 -P 1后 ) (1-8)

[0177] Finally, the specific gas replenishment volumes of sulfur hexafluoride and nitrogen are set by the laminar pressure difference controller 304, and the gas chamber is started to be accurately replenished with gas until the preset pressure value is reached.

[0178] Through the above detailed steps, it can be ensured that the mixing ratio of sulfur hexafluoride and nitrogen during the gas replenishment process meets the equipment operation requirements, thereby improving the gas replenishment accuracy and ensuring the stability and safety of the power system; this method not only reduces human errors, but also improves work efficiency, and is particularly suitable for on-site rapid gas replenishment needs.

[0179] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A rapid on-site gas replenishment device for sulfur hexafluoride and mixed gas, characterized in that: include, A sulfur hexafluoride charging unit (100), a nitrogen charging unit (200), an air supply main line unit (300), a vacuum unit (400) and an air chamber air return unit (500); The sulfur hexafluoride charging unit (100) is connected to the nitrogen charging unit (200) and the air supply main line unit (300); The vacuum extraction unit (400) is connected to the air chamber air return unit (500) and the air supply main line unit (300).

2. The on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas as claimed in claim 1, characterized in that: The sulfur hexafluoride filling unit (100) comprises a first connecting pipe (101), a first gas interface (102) arranged at one end of the first connecting pipe (101), a first pressure regulating valve (103) arranged at the other end of the first connecting pipe (101), and a second connecting pipe (104) arranged at the other side of the first pressure regulating valve (103).

3. The on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas as claimed in claim 2, characterized in that: The nitrogen charging unit (200) comprises a third connecting pipe (201), a second gas interface (202) arranged at one end of the third connecting pipe (201), a second pressure regulating valve (203) arranged at the other end of the third connecting pipe (201), and a fourth connecting pipe (204) arranged at the other side of the second pressure regulating valve (203).

4. The on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas as claimed in claim 3, characterized in that: The main air supply line unit (300) comprises a two-position three-way valve (301) connecting the second connecting pipe (104) and the fourth connecting pipe (204), a first main air supply line (302) connected to the two-position three-way valve (301), a second main air supply line (303) arranged at one side of the first main air supply line (302), a laminar flow differential pressure controller (304) arranged at one side of the second main air supply line (303), a third main air supply line (305) arranged at one side of the laminar flow differential pressure controller (304), a solenoid air supply valve (306) arranged at the end of the third main air supply line (305), a fourth main air supply line (307) arranged at one end of the solenoid air supply valve (306), and a switch air chamber interface (308) arranged at the end of the fourth main air supply line (307).

5. The on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas as claimed in claim 4, characterized in that: The vacuum unit (400) comprises a first vacuum connection pipe (401) connected to the first air supply main line (302) and the second air supply main line (303), a first vacuum solenoid valve (402) arranged at one end of the first vacuum connection pipe (401), a second vacuum connection pipe (403) arranged at one side of the first vacuum solenoid valve (402), a third vacuum connection pipe (404) connected to the second vacuum connection pipe (403), a second vacuum solenoid valve (405) arranged at one end of the third vacuum connection pipe (404), A fourth vacuum pumping connecting pipe (406) is arranged on one side of the second vacuum pumping solenoid valve (405), a fourth air chamber return air connecting pipe (407) is connected to the fourth vacuum pumping connecting pipe (406), a constant volume steel cylinder isolation solenoid valve (408) is arranged at the end of the fourth vacuum pumping connecting pipe (406), a constant volume steel cylinder connecting pipe (409) is arranged on one side of the constant volume steel cylinder isolation solenoid valve (408), a constant volume steel cylinder (410) is arranged at the end of the constant volume steel cylinder connecting pipe (409), and an air pump (411) is arranged at the end of the second vacuum pumping connecting pipe (403).

6. The on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas as claimed in claim 5, characterized in that: The air chamber return air unit (500) comprises a third air chamber return air connecting pipe (501) connected to the first air supply main line (302) and the second air supply main line (303), a first air chamber return air solenoid valve (502) arranged at the end of the third air chamber return air connecting pipe (501), a second air chamber return air connecting pipe (503) arranged on one side of the first air chamber return air solenoid valve (502), a first air chamber return air connecting pipe (504) connected to the second air chamber return air connecting pipe (503), and a pressure transmitter (505) arranged at the end of the first air chamber return air connecting pipe (504).

7. The on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas as claimed in claim 6, characterized in that: The two-position three-way valve (301) connects the second connecting pipe (104), the fourth connecting pipe (204) and the first main air supply line (302); The two-position three-way valve (301) can control the connection relationship between various pipelines.

8. The on-site rapid gas replenishment equipment for sulfur hexafluoride and mixed gas as claimed in claim 7, characterized in that: The fourth air chamber return air connection pipe (407) connects the third air supply main line (305) with the fourth vacuum connection pipe (406); One end of the fourth air chamber return air connection pipe (407) is disposed between the laminar flow pressure difference controller (304) and the air supply solenoid valve (306).

9. A method for replenishing sulfur hexafluoride gas chamber, characterized in that: The on-site rapid gas replenishment device for sulfur hexafluoride and mixed gas comprises any one of claims 1 to 8; and S1: Connect the air supply pipeline; S2: Self-cleaning of air supply pipeline; S3: Flushing the air supply pipeline with sulfur hexafluoride; S4: replenishing air to the air replenishment chamber until the pressure of the air replenishment chamber reaches a preset air replenishment pressure value.

10. A mixed gas chamber gas replenishment method, characterized in that: The on-site rapid gas replenishment device for sulfur hexafluoride and mixed gas comprises any one of claims 1 to 8; and S1: Get the rated air chamber pressure P of the air chamber to be replenished 额 and the measured mixing ratio concentration σ 实 ; S2: Vacuum the system; S3: effective volume of the air chamber to be replenished; S4: Derivation of the concentration of the supplementary mixture σ 补 , and determine the amount of sulfur hexafluoride required to be supplemented according to the supplementary gas concentration V SF6补 and V N2补 .

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