CF3SO2F environment-friendly electrical equipment gas detection device and method

Abstract

The invention discloses a CF3SO2F environment-friendly electrical equipment gas detection device and method.The CF3SO2F environment-friendly electrical equipment gas detection method comprises the steps that gas sampling is conducted through a gas sampling unit, and a gas sample is obtained; calculating the molar volume ratio of CF3SO2F in the gas sample by using a molar volume ratio detection unit; detecting the temperature of the gas sample by using a temperature sensor; detecting the pressure of the gas sample in real time by using a pressure sensor; calculating, using a gas pressure detection unit, a second pressure of the electrical device at 20 DEG C based on the molar volume ratio, the temperature data, and the first pressure; adjusting the temperature of the gas sample to a first preset temperature; performing component separation on the gas sample by using a mixed gas separation unit; adjusting the temperature of the gas sample to a second preset temperature by using a second temperature control list; detecting the gas volume fraction of CF3SO2F in the gas sample by using a gas purity detection unit; and determining the state of the gas in the electrical equipment based on the molar volume ratio, the second pressure and the gas volume fraction by utilizing a gas state comparison analysis unit.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly gas-insulated power transmission and distribution equipment, and more specifically, to a CF 3 SO 2 F environmentally friendly electrical equipment gas detection device and method. Background Art

[0002] Sulfur hexafluoride (SF 6 ) gas is widely used in electrical equipment due to its excellent insulating and arc-extinguishing media. However, its greenhouse effect is 24,300 times that of CO 2 , and its lifespan in the atmosphere is up to more than 3,000 years. It is listed as one of the six greenhouse gases prohibited from emission and restricted from use in international conventions such as the Kyoto Protocol. Research results show that the new environmentally friendly insulating gas trifluoromethylsulfonyl fluoride (CF 3 SO 2 F) has an insulation strength 1.6 times that of SF 6 gas under the same gas pressure, a liquefaction temperature of -23.7°C, an acute inhalation toxicity LC50>20000 μL / L, and a global warming potential GWP value <1000. It can be seen that its key performance is excellent. The mixed gas composed of CF 3 SO 2 F and N 2 has high insulation strength and low greenhouse effect, and is considered a potential environmentally friendly alternative gas to SF 6 for electrical equipment, and is gradually realizing engineering applications in equipment. However, since CF 3 SO 2 F is a brand-new environmentally friendly insulating gas, there are few publicly reported relevant studies on the detection of CF 3 SO 2 F / N 2 mixed gas, making it difficult to meet the reliability requirements of on-site engineering operation of CF 3 SO 2 F environmentally friendly electrical equipment.

[0003] Currently, for mixed gases such as SF 6 / N 2 , perfluoroisobutyronitrile (C 4 F 7 N), etc. used in electrical equipment, the condition detection still mostly refers to the detection of SF 6 gas. Key parameters such as gas pressure, mixing ratio, purity, and humidity are all detected by various single devices. Since the gas samples detected by each device are inconsistent, the detection results of gas state parameters lack comparability, which may cause deviations in the analysis of the equipment operation state.

[0004] Therefore, specifically for the new environmentally friendly insulating gas CF 3SO 2 F, it is urgent to develop a CF 3 SO 2 F environmentally friendly electrical equipment gas detection device and method. Summary of the Invention

[0005] The present invention provides a CF 3 SO 2 F environmentally friendly electrical equipment gas detection device and method to solve the problem of how to efficiently detect the gas in CF 3 SO 2 F environmentally friendly electrical equipment.

[0006] To solve the above problems, according to one aspect of the present invention, a CF 3 SO 2 F environmentally friendly electrical equipment gas detection device is provided. The device includes: a gas sampling unit, a first electric control valve, a molar volume ratio detection unit, a second electric control valve, a gas pressure detection unit, a temperature sensor, a pressure sensor, a mixed gas separation unit, a first temperature control unit, a gas purity detection unit, a second temperature control unit, and a gas state comparison and analysis unit; wherein,

[0007] The gas sampling unit is connected to the air inlet of the electrical equipment and is used for gas sampling to obtain a gas sample;

[0008] The molar volume ratio detection unit is connected to the output end of the gas sampling unit through the first electric control valve and is used for calculating the molar volume ratio of CF 3 SO 2 F in the gas sample;

[0009] The temperature sensor is connected to the gas pressure detection unit and is used for detecting the temperature of the gas sample and outputting temperature data to the gas pressure detection unit;

[0010] The pressure sensor is connected to the gas pressure detection unit and is used for detecting the pressure of the gas sample in real time and outputting a first pressure to the gas pressure detection unit;

[0011] The gas pressure detection unit is connected to the output end of the molar volume ratio detection unit through the second electric control valve and is used for calculating the second pressure of the electrical equipment at 20°C based on the molar volume ratio of CF 3 SO 2 F, temperature data, and the first pressure;

[0012] The first temperature control unit is connected to the mixed gas separation unit and is used for adjusting the temperature of the gas sample to a first preset temperature;

[0013] The mixed gas separation unit is connected to the second electric control valve and is used for separating the components of the gas sample;

[0014] The second temperature control unit is connected to the gas purity detection unit and is used for adjusting the temperature of the gas sample to a second preset temperature;

[0015] The gas purity detection unit is used for detecting the volume fraction of CF 3 SO 2 F in the gas sample;

[0016] The gas state comparison and analysis unit is respectively connected to the gas pressure detection unit and the gas purity detection unit, and is used for determining the state of the gas in the electrical equipment based on the molar volume ratio of CF 3 SO 2 F, the second pressure and the gas volume fraction.

[0017] Preferably, the molar volume ratio detection unit calculates the molar volume ratio of CF 3 SO 2 F in the gas sample, including:

[0018] Using a gas sensor or a gas chromatograph to detect the molar volume ratio of CF 3 SO 2 F in the gas sample, substituting the output signal S a into S(k) = f·k + b, and calculating the molar volume ratio k 3 SO 2 F of the gas sample; a ;

[0019] wherein, f and b are preset coefficients; k is the molar volume ratio of CF 3 SO 2 F; S(k) is the output signal when the molar volume ratio is k.

[0020] Preferably, the gas pressure detection unit calculates the second pressure of the electrical equipment at 20 °C based on the molar volume ratio of CF 3 SO 2 F, the temperature data and the first pressure, including:

[0021] Substituting the molar volume ratio of CF 3 SO 2 F and the temperature data into the P-T curve p 3 SO 2 F / N 2 of the mixed gas p s = kp 1 + (1 - k)p2 , obtain the second pressure; wherein,

[0022] Utilize p a20 = p a -(p s - p r ) to obtain the second pressure p of the electrical equipment at 20 °C a20 ;

[0023] Wherein, p s is the second pressure; k is the molar volume ratio of CF 3 SO 2 F, k = k a ; p 1 is the pressure of CF 3 SO 2 F; p 2 is the pressure of N 2 ; T is the temperature; A, B, C are the fitting coefficients of the Antoine equation; p a is the first pressure; p r is the rated gas pressure of the electrical equipment.

[0024] Preferably, the first preset temperature is -30 °C; the range of the second preset temperature is 15 °C to 30 °C.

[0025] Preferably, the gas purity detection unit is used to detect the components of CF 3 SO 2 F and impurity gases by gas chromatography to detect the gas volume fraction of CF 3 SO 2 F in the gas sample.

[0026] Preferably, the gas state comparison and analysis unit determines the state of the gas in the electrical equipment based on the molar volume ratio, the second pressure, and the gas volume fraction of CF 3 SO 2 F, including:

[0027] Utilize Δk a = k ar - k a to obtain the difference in the molar volume ratio Δk of CF 3 SO 2 F; wherein, k a is the rated molar volume ratio of CF ar SO 3 F of the electrical equipment; k 2 is the molar volume ratio of CF a SO 3 F in the gas sample; 2 ;

[0028] Utilize Δp a = p r - p a20 to obtain the gas pressure difference Δp of the electrical equipment a ; where p r is the rated gas pressure of the electrical equipment; the second pressure p of the electrical equipment at 20 °C a20 ;

[0029] If Δk a > 0.05% or p CF < 99%, it is determined that the gas state does not meet the operation requirements and the gas in the electrical equipment needs to be replaced; if Δp a > 0.1 MPa, it is determined that the gas state does not meet the operation requirements and CF 3 SO 2 F with a rated molar volume ratio k ar of CF 3 SO 2 F / N 2 mixed gas needs to be supplemented to the rated gas pressure p r .

[0030] Preferably, the gas sampling unit includes: a first solenoid valve, a second solenoid valve, a pressure reducing valve, a first flowmeter, a second flowmeter, and a gas sampling module;

[0031] Wherein, one end of the first solenoid valve is connected to the air inlet of the electrical equipment, and the other end is respectively connected to one end of the second solenoid valve and one end of the pressure reducing valve; the other end of the second solenoid valve is connected to the output end of the gas sampling module through the first flowmeter; the other end of the pressure regulating valve is connected to the input end of the gas sampling module through the second flowmeter; the gas sampling module is used to obtain the gas sample.

[0032] Preferably, when sampling from the air inlet of the CF 3 SO 2 F environmentally friendly electrical equipment, open the first solenoid valve, the second solenoid valve, and the pressure reducing valve, allow the gas to flow continuously for a preset time period, then close the second solenoid valve, and close the pressure reducing valve when the sampling reaches full capacity.

[0033] According to another aspect of the present invention, there is provided a CF 3 SO 2 F gas detection method for an F environmentally friendly electrical equipment based on the CF 3 SO 2 F environmentally friendly electrical equipment gas detection device as described above, the method includes:

[0034] Use the gas sampling unit to perform gas sampling to obtain a gas sample;

[0035] Use the molar volume ratio detection unit to calculate the molar volume ratio of CF 3 SO 2 F in the gas sample;

[0036] Use temperature sensing to detect the temperature of the gas sample and output the temperature data to the gas pressure detection unit;

[0037] Use a pressure sensor to detect the pressure of the gas sample in real time and output the first pressure to the gas pressure detection unit;

[0038] Use the gas pressure detection unit to calculate the second pressure of the electrical equipment at 20 °C based on the molar volume ratio of CF 3 SO 2 F, temperature data, and the first pressure;

[0039] Use the first temperature control unit to adjust the temperature of the gas sample to the first preset temperature;

[0040] Use the mixed gas separation unit to separate the components of the gas sample;

[0041] Use the second temperature control unit to adjust the temperature value of the gas sample to the second preset temperature;

[0042] Use the gas purity detection unit to detect the gas volume fraction of CF 3 SO 2 F in the gas sample;

[0043] Use the gas state comparison and analysis unit to determine the state of the gas in the electrical equipment based on the molar volume ratio of CF 3 SO 2 F, the second pressure, and the gas volume fraction.

[0044] Preferably, using the molar volume ratio detection unit to calculate the molar volume ratio of CF 3 SO 2 F in the gas sample includes:

[0045] Use a gas sensor or gas chromatograph to perform a molar volume ratio detection of CF 3 SO 2 F in the gas sample, and substitute the output signal S a into S(k) = f·k + b to calculate the molar volume ratio k of CF 3 SO 2 F in the gas sample; a ;

[0046] where f and b are preset coefficients; k is the molar volume ratio of CF 3 SO2 The molar volume ratio of F; S(k) is the output signal when the molar volume ratio is k.

[0047] Preferably, a gas pressure detection unit is used to calculate the second pressure of the electrical equipment at 20 °C based on the molar volume ratio of CF 3 SO 2 in the gas sample, temperature data, and the first pressure, including:

[0048] Substitute the molar volume ratio of CF 3 SO 2 and temperature data into the P-T curve p 3 SO 2 of the F / N 2 mixed gas p s = kp 1 +(1-k)p 2 , to obtain the second pressure; where

[0049] Use p a20 = p a -(p s - p r ) to obtain the second pressure p a20 of the electrical equipment at 20 °C;

[0050] where p s is the second pressure; k is the molar volume ratio of CF 3 SO 2 F, k = k a ; p 1 is the CF 3 SO 2 F gas pressure; p 2 is the N 2 gas pressure; T is the temperature; A, B, and C are the fitting coefficients of the Antoine equation; p a is the first pressure; p r is the rated gas pressure of the electrical equipment.

[0051] Preferably, the first preset temperature is -30 °C; the range of the second preset temperature is 15 °C to 30 °C.

[0052] Preferably, the method further includes:

[0053] The gas purity detection unit uses gas chromatography to detect the components of CF 3 SO 2 F and impurity gases to detect the gas volume fraction of CF 3 SO 2 F in the gas sample.

[0054] Preferably, a gas state comparison and analysis unit is used to determine the state of the gas in the electrical equipment based on the molar volume ratio of CF 3 SO 2 F, the second pressure, and the gas volume fraction, including:

[0055] Using Δk a = k ar - k a to obtain the difference in the molar volume ratio of CF 3 SO 2 F, Δk a ; where k ar is the rated molar volume ratio of CF 3 SO 2 F of the electrical equipment; k a is the molar volume ratio of CF 3 SO 2 F in the gas sample;

[0056] Using Δp a = p r - p a20 to obtain the gas pressure difference Δp a of the electrical equipment; where p r is the rated gas pressure of the electrical equipment; the second pressure p a20 of the electrical equipment at 20 °C;

[0057] If Δk a > 0.05% or p CF < 99%, it is determined that the gas state does not meet the operating requirements and the gas in the electrical equipment needs to be replaced; if Δp a > 0.1 MPa, it is determined that the gas state does not meet the operating requirements and it is necessary to supplement the CF 3 SO 2 F rated molar volume ratio k ar of CF 3 SO 2 F / N 2 mixed gas to the rated gas pressure p r .

[0058] Preferably, the gas sampling unit includes: a first solenoid valve, a second solenoid valve, a pressure reducing valve, a first flowmeter, a second flowmeter, and a gas sampling module;

[0059] Wherein, one end of the first solenoid valve is connected to the air inlet of the electrical equipment, and the other end is respectively connected to one end of the second solenoid valve and one end of the pressure reducing valve; the other end of the second solenoid valve is connected to the output end of the gas sampling module through the first flowmeter; the other end of the pressure regulating valve is connected to the input end of the gas sampling module through the second flowmeter; the gas sampling module is used to obtain the gas sample.

[0060] Preferably, the method further includes:

[0061] From CF 3 SO 2 When sampling from the air inlet of the CF

[0062] The present invention provides a CF 3 SO 2 F environmentally friendly electrical equipment gas detection device and method, which can carry out CF 3 SO 2 F molar volume ratio, CF 3 SO 2 F / N 2 mixed gas pressure and CF 3 SO 2 F gas purity detection, and then comprehensively obtain the CF 3 SO 2 F / N 2 comprehensive state of the mixed gas, and judge and analyze whether the gas state can meet the requirements for the long-term reliable operation of the equipment, and can provide technical support for the operation of CF 3 SO 2 F environmentally friendly electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] By referring to the following drawings, the exemplary embodiments of the present invention can be more completely understood:

[0064] Figure 1 FIG. 3 SO 2 100 is a schematic structural diagram of a CF

[0065] Figure 2 FIG. 3 SO 2 100 is a connection relationship diagram of a CF

[0066] Figure 3CF according to an embodiment of the present invention 3 SO 2 Flowchart of the gas detection method 300 for CF 3 SO 2 F environmentally friendly electrical equipment Detailed implementation manners

[0067] Now, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same units / components are denoted by the same reference numerals.

[0068] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the ordinary meaning understood by those skilled in the art. In addition, it can be understood that the terms defined in the commonly used dictionary should be understood to have a meaning consistent with the context of their related fields, and should not be understood as idealized or overly formal meanings.

[0069] Figure 1 CF according to an embodiment of the present invention 3 SO 2 Schematic structural diagram of the gas detection device 100 for CF 3 SO 2 F environmentally friendly electrical equipment. As Figure 1 shown, the gas detection device for CF 3 SO 2 F environmentally friendly electrical equipment provided by the embodiment of the present invention can carry out the detection of the molar volume ratio of CF 3 SO 2 F, the pressure of the CF 3 SO 2 F / N mixed gas, and the purity of the CF 2 SO 3 F gas on the gas sample collected from the operating equipment, and then comprehensively obtain the comprehensive state of the CF 2 SO 3 F / N mixed gas during the operation of the equipment, and judge and analyze whether the gas state can meet the requirements for the long-term reliable operation of the equipment, and can provide technical support for the operation of the CF 2 SO 2 F / N environmentally friendly electrical equipment. The gas detection device for CF 3 SO 2 F environmentally friendly electrical equipment provided by the embodiment of the present invention 3 SO 2 can carry out the detection of the molar volume ratio of CF 3 SO 2 F, the pressure of the CF 3 SO 2 F / N mixed gas, and the purity of the CF 2 SO 3 F gas on the gas sample collected from the operating equipment 3 SO 2 F molar volume ratio, CF 3 SO 2 F 3 SO 2 F / N 2 mixed gas pressure and CF 3 SO 2 F 3 SO 2 gas purity detection, and then comprehensively obtain the comprehensive state of the CF 3 SO 2 F / N mixed gas during the operation of the equipment 3 SO 2 F / N 2 mixed gas, and judge and analyze whether the gas state can meet the requirements for the long-term reliable operation of the equipment, and can provide technical support for the operation of the CF 3 SO 2 F environmentally friendly electrical equipment 3 SO 2 F environmentally friendly electrical equipment. The gas detection device for CF 3 SO 2 F environmentally friendly electrical equipment provided by the embodiment of the present invention 3 SO 2The F environmentally friendly electrical equipment gas detection device 100 includes: a gas sampling unit 101, a first electric control valve 102, a molar volume ratio detection unit 103, a second electric control valve 104, a gas pressure detection unit 105, a temperature sensor 106, a pressure sensor 107, a mixed gas separation unit 108, a first temperature control unit 109, a gas purity detection unit 110, a second temperature control unit 111, and a gas state comparison and analysis unit 112.

[0070] Preferably, the gas sampling unit 101 is connected to the air inlet of the electrical equipment and is used for gas sampling to obtain a gas sample.

[0071] Preferably, the gas sampling unit 101 includes: a first solenoid valve, a second solenoid valve, a pressure reducing valve, a first flowmeter, a second flowmeter, and a gas sampling module;

[0072] Wherein, one end of the first solenoid valve is connected to the air inlet of the electrical equipment, and the other end is respectively connected to one end of the second solenoid valve and one end of the pressure reducing valve; the other end of the second solenoid valve is connected to the output end of the gas sampling module through the first flowmeter; the other end of the pressure reducing valve is connected to the input end of the gas sampling module through the second flowmeter; the gas sampling module is used to obtain the gas sample.

[0073] Preferably, when sampling from the air inlet of the CF 3 SO 2 SO2F environmentally friendly electrical equipment, open the first solenoid valve, the second solenoid valve, and the pressure reducing valve, allow the gas to flow continuously for a preset time period, then close the second solenoid valve, and when the sampling reaches full capacity, close the pressure reducing valve.

[0074] Combined with Figure 2 As shown, in the present invention, the detection device includes: a gas sampling unit 101, a first electric control valve 102, a molar volume ratio detection unit 103, a second electric control valve 104, a gas pressure detection unit 105, a temperature sensor 106, a pressure sensor 107, a mixed gas separation unit 108, a first temperature control unit 109, a gas purity detection unit 110, a second temperature control unit 111, and a gas state comparison and analysis unit 112. The gas sampling unit includes: a first solenoid valve 1011, a second solenoid valve 1012, a pressure reducing valve 1013, a first flowmeter 1014, a second flowmeter 1015, and a gas sampling module 1016.

[0075] In the present invention, the gas sampling unit takes a gas sample from the filling port of the CF3SO2F environmentally friendly electrical equipment, opens the first solenoid valve 1011, the second solenoid valve 1012, and the pressure reducing valve 1013, and the gas flow rate is 100 ～ 150 ml / min, and the gas flows continuously for 2～ 3 minutes. For the second solenoid valve 1012, the volume of the sampling container does not exceed 100 ml, the air pressure does not exceed 0.12 MPa. After the sampling full capacity is displayed, the pressure reducing valve 1013 is closed.

[0076] Preferably, the molar volume ratio detection unit 103 is connected to the output end of the gas sampling unit through the first electric control valve, and is used to calculate the CF 3 SO 2 molar volume ratio of F.

[0077] Preferably, the molar volume ratio detection unit 103 calculates the CF in the gas sample 3 SO 2 molar volume ratio of F, including:

[0078] Using a gas sensor or gas chromatograph to detect the CF in the gas sample 3 SO 2 molar volume ratio of F, substituting the output signal S a into S(k)=f·k + b, and calculating the CF in the gas sample 3 SO 2 molar volume ratio k of F a ;

[0079] wherein, f and b are preset coefficients; k is the CF 3 SO 2 molar volume ratio of F; S(k) is the output signal when the molar volume ratio is k.

[0080] In the present invention, first, a gas sensor or gas chromatography is used to detect the standard gas of the CF 3 SO 2 F / N 2 mixed gas, and the output signal expression of the gas sensor or gas chromatograph is obtained as S(k)=f·k + b, wherein the CF 3 SO 2 molar volume ratios k of F are 10%, 15%, 20%, 50% respectively, and f, b are coefficients.

[0081] When detecting based on the molar volume ratio detection unit 103, open the first electric control valve 102 and the first electric control valve 104, and use a gas sensor or gas chromatography to detect the CF in the collected gas sample 3 SO 2 molar volume ratio of F, substitute the output signal S of the gas sensor or gas chromatograph a into S(k)=f·k + b, and obtain the CF in the gas sample 3 SO 2 molar volume ratio k of Fa 。

[0082] Preferably, the temperature sensor 106 is connected to the gas pressure detection unit, and is configured to detect the temperature of the gas sample and output temperature data to the gas pressure detection unit.

[0083] Preferably, the pressure sensor 107 is connected to the gas pressure detection unit, and is configured to detect the pressure of the gas sample in real time and output a first pressure to the gas pressure detection unit.

[0084] Preferably, the gas pressure detection unit 105 is connected to the output end of the molar volume ratio detection unit through a second electric control valve, and is configured to calculate the second pressure of the electrical equipment at 20 °C based on the molar volume ratio of CF 3 SO 2 F in the gas sample, the temperature data, and the first pressure.

[0085] Preferably, the gas pressure detection unit 105 calculates the second pressure of the electrical equipment at 20 °C based on the molar volume ratio of CF 3 SO 2 F in the gas sample, the temperature data, and the first pressure, including:

[0086] Substitute the molar volume ratio of CF 3 SO 2 F and the temperature data into the P-T curve p 3 SO 2 F / N 2 of the mixed gas p s = kp 1 + (1 - k)p 2 , and obtain the second pressure; where

[0087] Use p a20 = p a - (p s - p r ) to obtain the second pressure p a20 of the electrical equipment at 20 °C;

[0088] where, p s is the second pressure; k is the molar volume ratio of CF 3 SO 2 F, k = k a ; p 1 is the CF 3 SO 2 F air pressure; p 2 is the N 2 air pressure; T is the temperature; A, B, C are the fitting coefficients of the Antoine equation; pa is the first pressure; p r is the rated gas pressure of the electrical equipment.

[0089] In the present invention, the Antoine equation is used to fit the saturated vapor pressure characteristics of CF 3 SO 2 F gas, and the P-T curve expression of CF 3 SO 2 F gas is:

[0090]

[0091] In the formula, p 1 is the pressure of CF 3 SO 2 F, with the unit of kPa; T is the Kelvin temperature, with the unit of K; A, B, and C are the fitting coefficients of the Antoine equation, A = 14.67, B = 2446.92, C = -6.017.

[0092] The Antoine equation is used to fit the saturated vapor pressure characteristics of N 2 , and its P-T curve expression with temperature is:

[0093]

[0094] In the formula, p 2 is the pressure of N 2 , with the unit of kPa.

[0095] By combining Equation (1) and Equation (2), the P-T curve of the CF 3 SO 2 F / N 2 mixed gas can be obtained as:

[0096] p s = kp 1 +(1 - k)p 2 (3)

[0097] In the formula, p s is the pressure of the mixed gas, with the unit of kPa.

[0098] In the present invention, when using the gas pressure detection unit to detect the gas pressure, the temperature sensor 106 and the pressure sensor 107 are used to detect the current temperature T a of the gas sample and the first pressure p a . Then, the molar volume ratio detection unit 103 injects the molar volume ratio k 3 of CF 2 SO a F in the gas sample and the current temperature T aSubstituting into Equation (3) gives the second pressure p of the gas sample s , and then combining with the rated gas pressure p of the electrical equipment r , the compensation pressure Δp is obtained as T = p s - p r ; further, the gas pressure of the electrical equipment at 20 °C is obtained as p a20 = p a - Δp T .

[0099] Preferably, the first temperature control unit 109 is connected to the mixed gas separation unit and is used to adjust the temperature of the gas sample to a first preset temperature.

[0100] Preferably, the first preset temperature is -30 °C.

[0101] Preferably, the mixed gas separation unit 108 is connected to a second electric control valve and is used to separate the components of the gas sample.

[0102] Preferably, the second temperature control unit 111 is connected to the gas purity detection unit and is used to adjust the temperature of the gas sample to a second preset temperature.

[0103] Preferably, the range of the second preset temperature is 15 °C to 30 °C.

[0104] Preferably, the gas purity detection unit 110 is used to detect the volume fraction of CF 3 SO 2 F in the gas sample.

[0105] Preferably, the gas purity detection unit 110 is used to detect CF 3 SO 2 F and the components of impurity gases by gas chromatography to detect the volume fraction of CF 3 SO 2 F in the gas sample.

[0106] In the present invention, when separating the components of the gas sample, the first temperature is controlled at -30 °C to separate N 2 from CF 3 SO 2 F and other impurity gases; the liquid sample enters the gas purity detection unit, the second temperature is controlled at 15 °C to 30 °C, and CF 3 SO 2 F and its impurity gas components are detected by gas chromatography in the gas purity detection unit to obtain the volume fraction p 3 SO 2 of CF CF .

[0107] In the present invention, after the gas purity is detected, the collected gas sample can be recharged into the electrical equipment.

[0108] Preferably, the gas state comparison and analysis unit 112 is respectively connected to the gas pressure detection unit and the gas purity detection unit, and is used to determine the state of the gas in the electrical equipment based on the molar volume ratio of CF 3 SO 2 F, the second pressure, and the gas volume fraction.

[0109] Preferably, the gas state comparison and analysis unit 112 determines the state of the gas in the electrical equipment based on the molar volume ratio of CF 3 SO 2 F, the second pressure, and the gas volume fraction, including:

[0110] Using Δk a = k ar - k a To obtain the molar volume ratio difference Δk of CF 3 SO 2 F; where k a is the rated molar volume ratio of CF ar in the electrical equipment; k 3 SO 2 F; k a is the molar volume ratio of CF 3 SO 2 F in the gas sample;

[0111] Using Δp a = p r - p a20 To obtain the gas pressure difference Δp of the electrical equipment a ; where p r is the rated gas pressure of the electrical equipment; the second pressure p of the electrical equipment at 20 °C a20 ;

[0112] If Δk a > 0.05% or p CF < 99%, it is determined that the gas state does not meet the operation requirements and the gas in the electrical equipment needs to be replaced; if Δp a > 0.1 MPa, it is determined that the gas state does not meet the operation requirements and CF 3 SO 2 F rated molar volume ratio k ar of CF 3 SO 2 F / N 2 mixed gas needs to be supplemented to the rated gas pressure p r。

[0113] In the present invention, by comparing k a with the CF of the electrical equipment 3 SO 2 F rated molar volume ratio k ar , Δk a = k ar - k a is obtained; by comparing p a20 with the rated gas pressure p of the electrical equipment r , Δp a = p r - p a20 is obtained. If Δk a > 0.05%, or p CF < 99%, the gas in the electrical equipment needs to be replaced; if Δp a > 0.1 MPa, CF 3 SO 2 F rated molar volume ratio k ar of CF 3 SO 2 F / N 2 mixed gas needs to be supplemented to the rated gas pressure p r .

[0114] The method of the present invention provides an important guarantee for the reliable operation of the CF 3 SO 2 F / N 2 environmentally friendly electrical equipment by obtaining key state parameters such as the CF 3 SO 2 F molar volume ratio, the mixed gas pressure, and the CF 3 SO 2 F gas purity in the mixed gas 3 SO 2 .

[0115] The present invention samples the CF 3 SO 2 F / N 2 mixed gas of the electrical equipment and eliminates the dead volume problem of gas sampling by using the method of cyclic flushing; first, the CF 3 SO 2 F molar volume ratio of the mixed gas is detected, and then the mixed gas pressure is detected to ensure that the insulation performance of the equipment meets the operation requirements; at the same time, by using the boiling point difference between CF 3 SO 2 F (boiling point -23.7°C) and N 2 (boiling point -195.8°C), N 2 is separated from CF 3 SO2 Separate other gases such as F, and then detect CF 3 SO 2 The purity of the F gas is ensured to meet the long-term operation requirements of equipment such as gas-solid compatibility, providing an important basis for the normal and reliable operation of the equipment.

[0116] Figure 3 For CF according to the embodiments of the present invention 3 SO 2 Flow chart of the gas detection method 300 for CF Figure 3 As shown, the embodiments of the present invention provide a CF-based 3 SO 2 Gas detection device for CF 3 SO 2 The gas detection method 300 for CF

[0117] Preferably, the gas sampling unit includes: a first solenoid valve, a second solenoid valve, a pressure reducing valve, a first flow meter, a second flow meter, and a gas sampling module;

[0118] Wherein, one end of the first solenoid valve is connected to the air inlet of the electrical equipment, and the other end is respectively connected to one end of the second solenoid valve and one end of the pressure reducing valve; the other end of the second solenoid valve is connected to the output end of the gas sampling module through the first flow meter; the other end of the pressure reducing valve is connected to the input end of the gas sampling module through the second flow meter; the gas sampling module is used to obtain the gas sample.

[0119] Preferably, the method further includes:

[0120] When sampling from the air inlet of the CF 3 SO 2 F environmental protection electrical equipment, open the first solenoid valve, the second solenoid valve, and the pressure reducing valve, allow the gas to flow continuously for a preset period of time, then close the second solenoid valve, and close the pressure reducing valve when the sampling reaches full capacity.

[0121] In step 302, use the molar volume ratio detection unit to calculate the molar volume ratio of CF 3 SO 2 F in the gas sample.

[0122] Preferably, calculating the molar volume ratio of CF 3 SO 2 F in the gas sample by the molar volume ratio detection unit includes:

[0123] Use a gas sensor or a gas chromatograph to perform a detection of the molar volume ratio of CF 3 SO 2 F in the gas sample, and substitute the output signal S a into S(k) = f·k + b to calculate the molar volume ratio k 3 of CF 2 SO a F in the gas sample;

[0124] where f and b are preset coefficients; k is the molar volume ratio of CF 3 SO 2 F; S(k) is the output signal when the molar volume ratio is k.

[0125] In step 303, use a temperature sensor to detect the temperature of the gas sample and output temperature data to the gas pressure detection unit.

[0126] In step 304, use a pressure sensor to detect the pressure of the gas sample in real time and output a first pressure to the gas pressure detection unit.

[0127] In step 305, use the gas pressure detection unit to calculate the second pressure of the electrical equipment at 20°C based on the molar volume ratio of CF 3 SO 2 F in the gas sample, the temperature data, and the first pressure.

[0128] Preferably, using the gas pressure detection unit to calculate the second pressure of the electrical equipment at 20°C based on the molar volume ratio of CF 3 SO 2 F in the gas sample, the temperature data, and the first pressure includes:

[0129] Substitute the molar volume ratio of CF 3 SO 2 F and the temperature data into the P-T curve p 3 SO 2 of the CF 2 SO s F / N 1 mixed gas p 2 = kp

[0130] +(1 - k)p a20 to obtain the second pressure; where a use p s = p r -(p a20 - p

[0131] to obtain the second pressure p sis the second pressure; k is the molar volume ratio of CF 3 SO 2 to F, k = k a ; p 1 is the pressure of CF 3 SO 2 F; p 2 is the pressure of N 2 ; T is the temperature; A, B, and C are the fitting coefficients of the Antoine equation; p a is the first pressure; p r is the rated gas pressure of the electrical equipment.

[0132] In step 306, the temperature of the gas sample is adjusted to the first preset temperature by using the first temperature control unit.

[0133] In step 307, the gas sample is separated into components by using the mixed gas separation unit.

[0134] In step 308, the temperature of the gas sample is adjusted to the second preset temperature by using the second temperature control unit.

[0135] Preferably, the first preset temperature is -30°C; the range of the second preset temperature is 15°C to 30°C.

[0136] In step 309, the gas volume fraction of CF 3 SO 2 F in the gas sample is detected by using the gas purity detection unit.

[0137] Preferably, the method further includes:

[0138] The gas purity detection unit uses gas chromatography to detect the components of CF 3 SO 2 F and impurity gases to detect the gas volume fraction of CF 3 SO 2 F in the gas sample.

[0139] In step 310, the gas state comparison and analysis unit determines the state of the gas in the electrical equipment based on the molar volume ratio of CF 3 SO 2 F, the second pressure, and the gas volume fraction in the gas sample.

[0140] Preferably, the gas state comparison and analysis unit determines the state of the gas in the electrical equipment based on the molar volume ratio of CF 3 SO 2 F, the second pressure, and the gas volume fraction, including:

[0141] Using Δk a = kar -k a Obtain CF 3 SO 2 The difference in molar volume ratio of F, Δk a ; where k ar is the CF of the electrical equipment 3 SO 2 F rated molar volume ratio; k a is the molar volume ratio of CF in the gas sample 3 SO 2 F;

[0142] Use Δp a = p r - p a20 To obtain the gas pressure difference Δp of the electrical equipment a ; where p r is the rated gas pressure of the electrical equipment; the second pressure p of the electrical equipment at 20 °C a20 ;

[0143] If Δk a > 0.05% or p CF < 99%, it is determined that the gas state does not meet the operating requirements and the gas in the electrical equipment needs to be replaced; if Δp a > 0.1 MPa, it is determined that the gas state does not meet the operating requirements and CF 3 SO 2 F rated molar volume ratio k ar of CF 3 SO 2 F / N 2 Mixed gas to the rated gas pressure p r .

[0144] The CF of the embodiment of the present invention 3 SO 2 F environmental protection type electrical equipment gas detection method 300 corresponds to the CF of another embodiment of the present invention 3 SO 2 F environmental protection type electrical equipment gas detection device 100, which will not be elaborated here

[0145] The present invention has been described by referring to a few embodiments. However, as is well known to those skilled in the art, other embodiments equivalent to those disclosed above of the present invention equally fall within the scope of the present invention

[0146] Generally, all terms used in the present invention are to be interpreted according to their ordinary meanings in the technical field, unless otherwise explicitly defined therein. All references to "a / the [device, component, etc.]" are to be interpreted openly as at least one instance of the device, component, etc., unless otherwise explicitly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed, unless explicitly stated.

[0147] Those skilled in the art will appreciate that the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0148] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce means for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or combinations of blocks.

[0149] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including instruction means that implement the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or combinations of blocks.

[0150] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operational steps are performed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or combinations of blocks.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent substitutions can still be made to the specific implementation manners of the present invention, and any modification or equivalent substitution that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A CF3SO2F environmentally friendly electrical equipment gas detection device, characterized in that: The device comprises: a gas sampling unit, a first electric regulating valve, a molar volume ratio detection unit, a second electric regulating valve, a gas pressure detection unit, a temperature sensor, a pressure sensor, a mixed gas separation unit, a first temperature control unit, a gas purity detection unit, a second temperature control unit and a gas state comparison and analysis unit; wherein, The gas sampling unit is connected to the gas inlet of the electrical equipment and is used to perform gas sampling and obtain a gas sample; The molar volume ratio detection unit is connected to the output end of the gas sampling unit through the first electric regulating valve, and is used to calculate the molar volume ratio of CF3SO2F in the gas sample; The temperature sensor is connected to the gas pressure detection unit, and is used to detect the temperature of the gas sample and output temperature data to the gas pressure detection unit; The pressure sensor is connected to the gas pressure detection unit, and is used to detect the pressure of the gas sample in real time and output a first pressure to the gas pressure detection unit; The gas pressure detection unit is connected to the output end of the molar volume ratio detection unit through a second electric regulating valve, and is used to calculate the second pressure of the electrical device at 20° C. based on the molar volume ratio of CF3SO2F in the gas sample, the temperature data and the first pressure; The first temperature control unit is connected to the mixed gas separation unit and is used to adjust the temperature of the gas sample to a first preset temperature; The mixed gas separation unit is connected to the second electric regulating valve and is used to separate the components of the gas sample; The second temperature control unit is connected to the gas purity detection unit and is used to adjust the temperature of the gas sample to a second preset temperature; The gas purity detection unit is used to detect the gas volume fraction of CF3SO2F in the gas sample; The gas state comparison and analysis unit is connected to the gas pressure detection unit and the gas purity detection unit respectively, and is used to determine the state of the gas in the electrical device based on the molar volume ratio of CF3SO2F in the gas sample, the second pressure and the gas volume fraction.

2. The device according to claim 1, characterized in that The molar volume ratio detection unit calculates the molar volume ratio of CF3SO2F in the gas sample, including: The gas sample is tested for CF3SO2F molar volume ratio using a gas sensor or a gas chromatograph, and the output signal S a Substituting S(k)=f·k+b, the molar volume ratio k of CF3SO2F in the gas sample is calculated. a ; Wherein, f and b are preset coefficients; k is the molar volume ratio of CF3SO2F; and S(k) is the output signal when the molar volume ratio is k.

3. The device according to claim 1, characterized in that The gas pressure detection unit calculates the second pressure of the electrical device at 20° C. based on the molar volume ratio of CF3SO2F in the gas sample, the temperature data and the first pressure, including: Substitute the molar volume ratio and temperature data of CF3SO2F into the PT curve of CF3SO2F / N2 mixed gas s =kp1+(1-k)p2, obtain the second pressure; wherein, Using p a20 =p a -(p s -p r ) Obtain the second pressure p of the electrical equipment at 20°C a20 ; Among them, p s is the second pressure; k is the molar volume ratio of CF3SO2F, k=k a ; p1 is CF3SO2F gas pressure; p2 is N2 gas pressure; T is temperature; A, B, C are the fitting coefficients of Antoine equation; p a is the first pressure; p r Rated gas pressure for electrical equipment.

4. The device according to claim 1, characterized in that The first preset temperature is -30°C; the second preset temperature ranges from 15°C to 30°C.

5. The device according to claim 1, characterized in that The gas purity detection unit is used to detect CF3SO2F and impurity gas components by gas chromatography to detect the gas volume fraction of CF3SO2F in the gas sample.

6. The device according to claim 1, characterized in that The gas state comparison and analysis unit determines the state of the gas in the electrical device based on the molar volume ratio of CF3SO2F in the gas sample, the second pressure and the gas volume fraction, including: Using Δk a =k ar -k a Get the molar volume ratio difference Δk of CF3SO2F a ; where k ar k is the rated molar volume ratio of CF3SO2F in electrical equipment; a is the molar volume ratio of CF3SO2F in the gas sample; Using Δp a =p r -p a20 Obtain the gas pressure difference Δp of electrical equipment a ; Among them, p r is the rated gas pressure of the electrical equipment; the second pressure p of the electrical equipment at 20°C a20 ; If Δk a >0.05% or p CF <99%, it is determined that the gas state does not meet the operating requirements and the gas in the electrical equipment needs to be replaced; if Δp a >0.1MPa, it is determined that the gas state does not meet the operating requirements, and the electrical equipment needs to be supplemented with CF3SO2F rated molar volume ratio k ar CF3SO2F / N2 mixed gas to the rated gas pressure p r .

7. The device according to claim 1, characterized in that The gas sampling unit comprises: a first solenoid valve, a second solenoid valve, a pressure reducing valve, a first flow meter, a second flow meter and a gas sampling module; Among them, one end of the first solenoid valve is connected to the air inlet of the electrical equipment, and the other end is respectively connected to one end of the second solenoid valve and one end of the pressure reducing valve; the other end of the second solenoid valve is connected to the output end of the gas sampling module through the first flow meter; the other end of the pressurizing valve is connected to the input end of the gas sampling module through the second flow meter; the gas sampling module is used to obtain the gas sample.

8. The device according to claim 7, characterized in that When sampling from the air inlet of CF3SO2F environmentally friendly electrical equipment, open the first solenoid valve, the second solenoid valve and the pressure reducing valve, allow the gas to flow continuously for a preset period of time, then close the second solenoid valve, and close the pressure reducing valve when the sample is full.

9. A CF3SO2F environment-friendly electrical equipment gas detection method based on the CF3SO2F environment-friendly electrical equipment gas detection device according to any one of claims 1 to 8, characterized in that: The method comprises: Using a gas sampling unit to perform gas sampling to obtain a gas sample; Calculating the molar volume ratio of CF3SO2F in the gas sample using a molar volume ratio detection unit; Using temperature sensing to detect the temperature of the gas sample, and outputting temperature data to the gas pressure detection unit; Using a pressure sensor to detect the pressure of the gas sample in real time, and output a first pressure to the gas pressure detection unit; Calculating a second pressure of the electrical device at 20° C. based on the molar volume ratio of CF3SO2F in the gas sample, the temperature data, and the first pressure using the gas pressure detection unit; Using a first temperature control unit to adjust the temperature of the gas sample to a first preset temperature; Using a mixed gas separation unit to separate the components of a gas sample; Using a second temperature control unit to adjust the temperature of the gas sample to a second preset temperature; The gas purity detection unit is used to detect the gas volume fraction of CF3SO2F in the gas sample; The gas state comparison and analysis unit is used to determine the state of the gas in the electrical device based on the molar volume ratio of CF3SO2F in the gas sample, the second pressure, and the gas volume fraction.

10. The method according to claim 9, characterized in that Calculating the molar volume ratio of CF3SO2F in the gas sample using a molar volume ratio detection unit includes: The gas sample is tested for CF3SO2F molar volume ratio using a gas sensor or a gas chromatograph, and the output signal S a Substituting S(k)=f·k+b, the molar volume ratio k of CF3SO2F in the gas sample is calculated. a ; Wherein, f and b are preset coefficients; k is the molar volume ratio of CF3SO2F; and S(k) is the output signal when the molar volume ratio is k.

11. The method according to claim 9, characterized in that The gas pressure detection unit is used to calculate the second pressure of the electrical device at 20° C. based on the molar volume ratio of CF3SO2F in the gas sample, the temperature data and the first pressure, including: Substitute the molar volume ratio and temperature data of CF3SO2F into the PT curve of CF3SO2F / N2 mixed gas s =kp1+(1-k)p2, obtain the second pressure; wherein, Using p a20 =p a -(p s -p r ) Obtain the second pressure p of the electrical equipment at 20°C a20 ; Among them, p s is the second pressure; k is the molar volume ratio of CF3SO2F, k=k a ; p1 is CF3SO2F gas pressure; p2 is N2 gas pressure; T is temperature; A, B, C are the fitting coefficients of Antoine equation; p a is the first pressure; p r Rated gas pressure for electrical equipment.

12. The method according to claim 9, characterized in that The first preset temperature is -30°C; the second preset temperature ranges from 15°C to 30°C.

13. The method according to claim 9, characterized in that The method further comprises: The gas purity detection unit uses gas chromatography to detect CF3SO2F and impurity gas components to detect the gas volume fraction of CF3SO2F in the gas sample.

14. The method according to claim 9, characterized in that The gas state comparison and analysis unit is used to determine the state of the gas in the electrical device based on the molar volume ratio of CF3SO2F in the gas sample, the second pressure, and the gas volume fraction, including: Using Δk a =k ar -k a Get the molar volume ratio difference Δk of CF3SO2F a ; where k ar k is the rated molar volume ratio of CF3SO2F in electrical equipment; a is the molar volume ratio of CF3SO2F in the gas sample; Using Δp a =p r -p a20 Obtain the gas pressure difference Δp of electrical equipment a ; Among them, p r is the rated gas pressure of the electrical equipment; the second pressure p of the electrical equipment at 20°C a20 ; If Δk a >0.05% or p CF <99%, it is determined that the gas state does not meet the operating requirements and the gas in the electrical equipment needs to be replaced; if Δp a >0.1MPa, it is determined that the gas state does not meet the operating requirements, and the electrical equipment needs to be supplemented with CF3SO2F rated molar volume ratio k ar CF3SO2F / N2 mixed gas to the rated gas pressure p r .

15. The method according to claim 9, characterized in that The gas sampling unit comprises: a first solenoid valve, a second solenoid valve, a pressure reducing valve, a first flow meter, a second flow meter and a gas sampling module; Among them, one end of the first solenoid valve is connected to the air inlet of the electrical equipment, and the other end is respectively connected to one end of the second solenoid valve and one end of the pressure reducing valve; the other end of the second solenoid valve is connected to the output end of the gas sampling module through the first flow meter; the other end of the pressurizing valve is connected to the input end of the gas sampling module through the second flow meter; the gas sampling module is used to obtain the gas sample.

16. The method according to claim 15, characterized in that The method further comprises: When sampling from the air inlet of CF3SO2F environmentally friendly electrical equipment, open the first solenoid valve, the second solenoid valve and the pressure reducing valve, allow the gas to flow continuously for a preset period of time, then close the second solenoid valve, and close the pressure reducing valve when the sample is full.

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