189 results about "Sulfur hexafluoride" patented technology

The invention discloses a micropore-rich carbon adsorbent and application thereof in separation of mixed gas of sulfur hexafluoride and nitrogen, and the micropore-rich carbon adsorbent is prepared by taking cellulose acetate as a precursor, performing low-temperature pre-carbonization treatment in an inert atmosphere, mixing with KOH, performing high-temperature activation in the inert atmosphere, and finally washing and drying. The carbon adsorbent prepared by a unique two-step method of low-temperature pre-carbonization and high-temperature activation has an extremely high specific surface area (1100-1700m < 2 > / g) and a pore channel structure mainly comprising micropores (the pore diameter is concentrated in 0.5-0.8 nm). The adsorbent shows ultrahigh adsorption capacity (the adsorption capacity can reach 2.83 mmol / g at the temperature of 25 DEG C and the pressure of 0.1 bar) on SF6. The carbon adsorbent disclosed by the invention is simple in preparation method, low in raw material cost and environment-friendly, and has a wide application prospect in the field of SF6 recovery and purification.

This invention relates to a sampling device and method for sulfur hexafluoride (SF6) and its mixed gases used in electrical equipment. The sampling device includes an equipment connection module, a sampling module, a gas filling module, and a vacuuming module. The equipment connection module, used to connect the electrical equipment and the gas sampler, consists of an equipment connection valve, a diaphragm pump, and corresponding pipelines. The sampling module, used for gas buffering, consists of a sampling cylinder, a pressure detection unit, a sampling valve, a gas filling valve, a tail gas valve, and corresponding pipelines. The gas filling module, used to fill the sampling container, consists of a booster pump, a sampling container connection valve, and corresponding pipelines. The vacuuming module, used for vacuuming and tail gas collection, consists of a vacuum pump, a tail gas collection device, and its connection valves. The sampling method utilizes appropriate flushing and vacuuming methods when the gas pressure is higher or lower than 0.2 MPa. This sampling device and method can improve the accuracy of sampling sulfur hexafluoride gas or sulfur hexafluoride mixed insulating gases.

The invention discloses a GIS equipment SF6 micro-water density lightweight online monitoring method based on double threshold triggering, and relates to the field of power equipment.The method comprises the steps that on the basis of a fusion mechanism of nonlinear drift characteristics and historical calibration parameters, sensor coefficients are calibrated; synchronously acquiring partial discharge and sulfur hexafluoride micro-water signals through a sensor; the method comprises the following steps: pre-screening abnormal data segments in partial discharge and sulfur hexafluoride micro-water signals through double thresholds of amplitude and time, and extracting alignment time marks and frequency domain energy, pulse density and micro-water slope features to obtain normalized features; inputting the normalized features into a classifier, and outputting the fault type and confidence of the gas insulated switchgear; and generating a maintenance and replacement instruction of the gas insulated switchgear according to the fault type and the confidence coefficient. According to the invention, through fusion of the high-precision capacitive humidity sensing network and the intelligent diagnosis algorithm, real-time sensing and risk early warning of the health state of the air chamber are realized.

The invention relates to the technical field of image processing, and discloses a sulfur hexafluoride ring main unit gas leakage detection method and system based on thermal imaging, and the method comprises the steps: obtaining an infrared thermal imaging multispectral sequence image of a ring main unit; identifying a plurality of candidate regions of the multispectral sequence image, selecting a gas reference region, and calculating an average multispectral vector of the gas reference region as a gas reference spectrum; calculating the intra-group variance of each spectrum channel, and determining a weight vector and an angle threshold value; calculating a weighted spectral angle between the multispectral vector of the pixel point to be detected and the gas reference spectrum; judging the to-be-detected pixel point which simultaneously meets the following conditions as a gas leakage point: the weighted spectral angle is smaller than an angle threshold value, and the temperature of the to-be-detected pixel point is lower than a preset temperature threshold value; and generating a visual image of the gas leakage area according to all the judged gas leakage points. According to the invention, the anti-interference capability of detection is improved, and reliable identification of sulfur hexafluoride gas leakage can be realized under a complex background.

The invention discloses a sulfur hexafluoride leakage detection method based on cooperation of long-wave infrared and thermal infrared spectrums, the sulfur hexafluoride leakage detection method is applied to a sulfur hexafluoride leakage detection device, and the sulfur hexafluoride leakage detection method comprises the following steps: carrying out calibration and parameter configuration on the sulfur hexafluoride leakage detection device; long-wave infrared spectrum and thermal infrared temperature field data are synchronously collected, preprocessing and time-space matching are carried out on the long-wave infrared spectrum and the thermal infrared temperature field data, leakage identification parameters are obtained, the thermal infrared temperature field data are temperature values of pixel points of a temperature field image, parameter calculation and risk early warning are carried out on the leakage identification parameters, and the leakage identification result is obtained. And obtaining a detection report. According to the invention, the sensitivity and accuracy of sulfur hexafluoride leakage detection can be improved.

The application discloses a high-voltage load-tap switching device and relates to the technical field of tap switches. The high-voltage load-tap switching device comprises a switching mechanism, a driving mechanism and a recovery mechanism. The switching mechanism is used for completing tap switching of high voltage. The driving mechanism provides power for switching of the switching mechanism. In the application, the second moving contact is separated from the second static contact to generate an electric arc before the first moving contact is switched, and the arc is extinguished by triggering a pressure accumulator pump to release sulfur hexafluoride gas. The sulfur hexafluoride gas has the characteristics of cooling, ion removal and flameout prevention, and the arc is quickly extinguished to create an arcless environment for high-voltage switching of the first moving contact, thereby avoiding ablation of the contact by the arc and improving the safety of equipment operation. After the arc is extinguished, the negative pressure pump is triggered by meshing transmission of the internal gear and the rack to suck the sulfur hexafluoride gas in the left cavity into the recovery tank, so that the gas is quickly recovered. The economic loss caused by waste of the gas is reduced, the risk of equipment aging is lowered, and the service life of the equipment is prolonged.

The invention provides a catalytic material based on magnetic iron ore and a preparation method and application thereof, the magnetic iron ore is used as an active site center, Portland cement is used as a carrier, water is used as a solvent, and the mass ratio of the magnetic iron ore to silicate is (1-2): (8-9). Magnetic iron ore becomes an ideal active site center of a catalytic material due to good magnetism, catalytic activity and low toxicity. The Portland cement is low in price, easy to obtain and high in stability and is often used as an adhesive or a carrier of various catalysts, the magnetic iron ore and the Portland cement are combined, the adsorption capacity on the sulfur hexafluoride gas can be improved, and then the removal efficiency of the sulfur hexafluoride gas is improved.

The embodiment of the invention discloses a sulfur hexafluoride online purification monitoring device, and relates to the technical field of high-voltage and ultrahigh-voltage electrics. The sulfur hexafluoride online purification monitoring device comprises a tank body, a selective permeable membrane and a purification monitoring assembly, the tank body is provided with an inner cavity, the selective permeable membrane is installed in the inner cavity and divides the inner cavity into a high-pressure side chamber and a low-pressure side chamber, the high-pressure side chamber is communicated with sulfur hexafluoride high-voltage electrical equipment, and the low-pressure side chamber is communicated with the purification monitoring assembly; sulfur hexafluoride in the sulfur hexafluoride high-voltage electrical equipment enters the high-voltage side cavity, the selective permeable membrane allows decomposition products of the sulfur hexafluoride and small air molecules to permeate into the low-voltage side cavity, the purification monitoring assembly monitors and purifies gas in the low-voltage side cavity and then discharges the gas, and the sulfur hexafluoride high-voltage electrical equipment does not need to be powered off. Therefore, the continuous operation in the operation state can be realized.

The invention belongs to the technical field of sulfur hexafluoride leakage detection, and relates to a biological detection method for sulfur hexafluoride leakage based on odorous dogs and GIS space positioning. Comprising the following steps: step 1, selecting dogs and performing special training; selecting dogs with high olfactory sensitivity, taking SF6 gas or equipment operation gas as a target smell source, establishing conditioned reflex through smell-reward training, and inhibiting interference on oil smell and dust; step 2, preparation before field detection; a ventilation system is closed to stabilize the smell, an anti-puncture sheath is arranged for the dog, and a tractor wears high-voltage protective clothing to ensure that the equipment is grounded; step 3, grading detection and accurate positioning; a dog census GIS equipment in a zigzag path, marks a suspicious area through warning, then sniffs key points such as a flange and an insulator in a close range, and remeasures and confirms a leakage point in combination with a portable leak detector. According to the invention, by using the advantages of sensitive smell and strong maneuverability of the odorous dog, the SF6 gas leakage of the GIS / GIL equipment can be quickly, efficiently and accurately positioned.

The present application relates to the technical field of gas monitoring, and is a kind of sulfur hexafluoride gas on-line monitoring system and method, specifically comprising: constructing surface adsorption kinetics equation to obtain the real-time surface adsorption amount of sulfur hexafluoride arc extinguishing decomposition product in the key components of arc extinguishing chamber;According to the thermal ablation term, the metal vapor generation rate is calculated;Establish a physical evaluation model for the influence of the surface adsorption layer in the arc extinguishing chamber on the flow field performance and heat transfer performance, and evaluate the flow field distortion factor and the thermal recovery retardation factor;Combined with the spatial position sensitive weight, the working performance degradation index of sulfur hexafluoride is predicted;According to the working performance degradation index of sulfur hexafluoride, the trigger judgment of sulfur hexafluoride monitoring alarm is carried out.The present application solves the problem that the gradual degradation of sulfur hexafluoride arc extinguishing ability cannot be accurately predicted and early warned in the prior art.

The invention discloses a multi-parameter cooperative monitoring method for sulfur hexafluoride insulation equipment, and relates to the technical field of equipment monitoring, original parameters are collected, and the original parameters comprise a sulfur hexafluoride concentration value, a sulfur hexafluoride density value and an original partial discharge signal; performing discharge preprocessing on the original partial discharge signal to obtain a partial discharge signal; constructing a point spread function matrix, and performing sparse reconstruction on the partial discharge signals by combining an orthogonal matching pursuit algorithm to obtain coordinates and discharge quantity of a partial discharge source; based on the sulfur hexafluoride concentration value, the sulfur hexafluoride density value, the coordinates of the partial discharge source and the discharge quantity, threshold judgment is carried out, and a grading early warning result is obtained. According to the invention, the early discovery capability and fault positioning precision of the insulation defect of the large sulfur hexafluoride insulation equipment are obviously improved, and reliable technical support is provided for equipment state evaluation and intelligent operation and maintenance.

The invention discloses a power distribution station house intelligent inspection robot based on an AI large model and a control system thereof, and relates to the technical field of power distribution station house inspection. And a multi-modal large model based on power distribution station house industry data fine adjustment is integrated in the multi-modal data processing module, and the multi-modal data processing module is used for processing and analyzing multi-modal data acquired by the path-finding camera, the distance measuring radar and the inspection information acquisition assembly and outputting an inspection result and a control instruction. According to the invention, the multi-mode large model based on power distribution station house industry data fine adjustment is arranged in the main control assembly, so that intelligent diagnosis and comprehensive pre-judgment of the state of key equipment of the power distribution station house are realized. The robot can fuse and analyze multi-source data such as infrared thermal imaging, partial discharge ultrasonic waves, sulfur hexafluoride gas concentration and the like and identify specific hidden dangers of a power distribution station room such as overheating of a switch cabinet contact, abnormal oil level of a transformer bushing, pollution flashover risk of an insulator and the like, so that targeted early warning and maintenance suggestions are output; and traditional data acquisition is improved into intelligent diagnosis and comprehensive pre-judgment.

The invention discloses a method, a system, a medium, equipment and a product for adjusting gas particulate matters of a sulfur hexafluoride gas insulated switchgear, and belongs to the technical field of adjustment of gas particulate matters of sulfur hexafluoride gas insulated switchgears. The method comprises the following steps: carrying out data preprocessing on obtained gas characteristic data of the sulfur hexafluoride gas insulated switchgear in a fixed time window to obtain preprocessed gas characteristic data, carrying out particulate matter concentration prediction by utilizing a trained gas characteristic prediction model to obtain predicted particulate matter concentration, and calculating a prediction slope; according to the obtained real-time gas flow rate and the real-time pressure of the sulfur hexafluoride gas insulated switchgear, a GPR online learning mechanism is utilized to obtain a self-adaptive particulate matter accumulation threshold value; and if the predicted slope is greater than or equal to a slope threshold value or the predicted particulate matter concentration is greater than or equal to a self-adaptive particulate matter accumulation threshold value, adjusting the gas flow rate of the sulfur hexafluoride gas insulated switchgear by using a GPR-based Bayesian optimization algorithm.

The invention discloses a sulfur hexafluoride gas cylinder inflation system, a sulfur hexafluoride gas cylinder transfer device and a sulfur hexafluoride gas cylinder transfer method.The sulfur hexafluoride gas cylinder inflation system comprises an inflation starting detection assembly, and the inflation starting detection assembly comprises an environment oxygen concentration detection part, an environment sulfur hexafluoride gas concentration detection part, an environment humidity detection part and an environment temperature detection part which are arranged on one side of a gas cylinder; the gas cylinder weight detection part is arranged at the bottom of the gas cylinder; the electromagnetic valve coil leakage current detection part is connected with the electromagnetic valve; the first gas density detection part is arranged at the outlet of the gas filling pipeline; according to the scheme, the electromagnetic valve is accurately controlled to be opened under the safety condition and the necessary inflation condition by monitoring multiple sets of environment data, gas cylinder data and data of the equipment to be inflated, the SF6 gas supplementing work quality is improved, and the safety of personnel and the equipment is guaranteed.

The utility model discloses a spectrum detection device for sulfur hexafluoride gas concentration, which relates to the technical field of sulfur hexafluoride concentration detection and comprises a device main body, a detection probe is arranged outside the device body, an adjusting assembly is arranged on one side of the detection probe, an air inlet pipe is fixedly connected to one side of the device body through an external air pump, and a drainage pipe is fixedly connected to the side, away from the air inlet pipe, of the device body. The detection probe emits laser or infrared light beams to directly penetrate through a gas area to be detected, the concentration is inverted by measuring attenuation of transmission light or reflected light, the position of the detection probe is adjusted through the adjusting assembly so as to adapt to different areas, the sulfur hexafluoride gas concentration can be rapidly inspected and detected in real time, and the practicability of equipment is improved. When leakage is found, the device is switched to a suction mode, gas is sucked into the device body through the gas inlet pipe, the concentration and decomposition products are accurately measured, the two modes can be switched according to detection targets, environmental conditions and maintenance capacity, and various requirements are met.

This application relates to the field of coal mining technology, and provides a method, device, electronic equipment, and medium for detecting air leakage in coal seam group mining faces. The method includes: determining test points in the area to be tested; determining gas collection points on the return airflow of the area to be tested; releasing sulfur hexafluoride (SF6) gas at each test point and collecting the gas at the gas collection points to obtain the test gas; wherein different test points release SF6 gas of different structural types; and determining the air leakage detection result of each test point based on the test gas. This application, by simultaneously releasing SF6 gas of different structural types at multiple test points in the area to be tested and determining the air leakage detection result of each test point based on the collected test gas, can achieve simultaneous multi-source air leakage detection, accurately determine the air leakage situation of each test point in the area to be tested, and improve the air leakage detection efficiency of coal seam group mining faces.

The utility model relates to the technical field of pipeline monitoring, and discloses a GRS pipeline sulfur hexafluoride gas monitoring and impurity removing device which comprises a connecting pipe, a connecting ring is fixedly connected to the inner wall of the left end of the connecting pipe, and a filtering assembly is arranged on one side face of the connecting ring. According to the GRS pipeline sulfur hexafluoride gas monitoring and impurity removing device, the circular-truncated-cone-shaped filter cartridge net enlarges the filtering contact area and is combined with the airflow optimization design of the spiral flow guide groove, impact of turbulent flow on the filter net is effectively reduced, it is ensured that gas passes through the filter net efficiently, meanwhile, the purpose of filtering the gas is achieved, and a pushing piece can be driven by bevel gear transmission to achieve the purpose of filtering the gas. Attached impurities can be peeled off in real time, the filter screen is prevented from being blocked, the manual maintenance frequency is greatly reduced, and the problems that a traditional static filter screen is prone to dirt accumulation and needs to be frequently shut down for cleaning are solved; a control monitoring host of a pressure sensor and a temperature sensor can sense the pressure difference and the gas state of the two sides of the filter screen in real time; and the automatic cleaning effect is achieved.

The invention discloses an adjacent tunnel fluid channeling ratio simulation test device and method combined with boundary conditions, the adjacent tunnel fluid channeling ratio simulation test device combined with the boundary conditions comprises an upstream tunnel model, a downstream tunnel model and a middle section road surface, and the side surface of the middle section road surface is provided with a crosswind simulation mechanism. And a full-spectrum lamp is arranged above the middle section of the road surface. The invention further relates to an adjacent tunnel fluid channeling ratio simulation test method in combination with the boundary conditions. According to the method, the sulfur hexafluoride (SF6) concentration is used as a basis for quantitatively calculating the fluid channeling ratio, fluid channeling analysis of traffic pollutants and high-temperature fire smoke can be combined, and a more accurate adjacent tunnel pollutant fluid channeling ratio is obtained by combining terrain wind environment boundary conditions and pavement thermal environment boundary conditions; and more reliable experimental data is provided for the design of adjacent tunnels and the type selection of ventilation and fire fighting equipment.

The utility model discloses an SF6 micro-water on-line monitoring device, which relates to the technical field of on-line monitoring and comprises a first support, a casing capable of being sealed, a gas circulation unit and a control unit. The gas circulation unit comprises a connecting pipe, a gas storage tank, a heating device for heating the gas storage tank and a micro water collector; a valve is arranged on the connecting pipe, the other end of the connecting pipe is connected with a connector, a first port of the connector is communicated with the connecting pipe, a second port of the connector is used for being communicated with a sulfur hexafluoride gas storage chamber in the high-voltage electrical equipment, a third port of the connector is used as a gas supplementing port, and a fourth port of the connector is communicated with the micro-water collector; the control unit comprises a mounting frame, a control circuit board and a protective shell, and a heat insulation layer is further arranged on the side, close to the heating device, of the mounting frame. The heat insulation layer effectively prevents a large amount of heat generated by the heating device from being transmitted to the control circuit board, and the service life is prolonged. And the first movable door and the second movable door are convenient for maintenance personnel to quickly approach corresponding parts according to needs.

The utility model relates to sulfur hexafluoride gas leakage monitoring technical field discloses a sulfur hexafluoride gas on -line leakage alarm equipment, including the main pipe body, the main pipe body is fixedly connected with the connecting pipe body, is provided with the monitoring module on the connecting pipe body, the assembly component sets up on the connecting pipe body, and the assembly component is used for assembling the monitoring module, and the assembly component includes first connecting disc, second connecting disc, first connecting block, second connecting block and limit rod, and the fixed connection between connecting pipe body and second connecting disc, the close contact between first connecting disc and second connecting disc, first connecting block symmetry sets up on first connecting disc, through limit rod, screw ring, spring and clamping groove between, in the pressing rotation of limit rod, realizes positioning, clamping, fixed effect such as, avoids the traditional fastener installation mode, leads to the installation cumbersome, and the rustification leads to the difficulty to take down, improves the installation efficiency and unloading efficiency of this device.

The application belongs to the technical field of high-purity sulfur hexafluoride preparation, and particularly relates to a method for preparing high-purity sulfur hexafluoride from sulfur recovered in a preparation process of hydrofluoric acid. The method for preparing fluorine-containing active ions through electrolysis of hydrofluoric acid can directly utilize the fluorine-containing active ions to fluorinate sulfur to generate sulfur hexafluoride gas without removing sulfur, and high-purity sulfur hexafluoride gas is prepared through rectification and purification, so that the recycling of sulfur resources is realized, the production efficiency and product purity are improved, and the energy consumption and environmental pollution are reduced.

The invention provides a fault monitoring method and system for a sulfur hexafluoride gas purification and filtration device, and relates to the technical field of gas purification, and the method comprises the steps: obtaining a first device monitoring block and a second device monitoring block; the sulfur hexafluoride gas purifying and filtering device is subjected to modular splitting, and a purifying assembly, a filtering assembly and a valve pipeline assembly are obtained; performing fault analysis on the purification assembly to obtain a first assembly fault analysis result; performing fault analysis on the filtering component to obtain a second component fault analysis result; performing fault analysis on the valve pipeline assembly to obtain a third assembly fault analysis result; global fault analysis is carried out, and a filtering device fault analysis report is generated. The technical problem that fault diagnosis is not accurate and timely enough due to the fact that the prior art usually focuses on fault monitoring of a single purifying or filtering assembly, cooperative monitoring and analysis of multiple assemblies are lacked and the overall health state of the device cannot be reflected comprehensively is solved.

This invention provides a remote-reading sulfur hexafluoride density meter, belonging to the field of electrical instrumentation technology. Its structure includes: a gear rotatably connected to the dial, with the gear teeth engaging with each other; a first fixing post fixedly connected to the dial, with a fixing hole on the first fixing post; a helical bimetallic strip, fitted around the gear's rotating shaft, with its inner end connected to the shaft. This invention adds a helical bimetallic strip to the gear mechanism and fixes its outer end. Based on this structure, when the bimetallic strip responds to temperature changes, the rotational movement of its inner end can compensate for under-reading caused by excessively high ambient temperatures and offset over-reading caused by excessively low ambient temperatures, thereby improving detection accuracy within a certain range. Furthermore, this invention adds a protective plate to the rear of the instrument for the response element, improving assembly reliability and providing protection.

This utility model relates to the field of switch box technology, specifically a dustproof and explosion-proof switch box for mining. It includes a box body with inlet slots on both sides. A hinged seat is fixedly connected to the front surface of the box body, and a door is hinged to the inner surface of the hinged seat. This utility model facilitates the use of a second U-shaped clamp to hold external wires, preventing the wires from coming loose due to tension when pulled. Pulling the snap-fit ​​plate upwards along the guide post positions it behind the connecting strip, allowing the door to be fixed while the wire is being held, increasing the practicality of the clamping mechanism. It also helps create a sealed environment inside the box. Sulfur hexafluoride gas has excellent insulation properties; filling the box with sulfur hexafluoride gas through a valve effectively improves the insulation performance inside the box, preventing short circuits and arcing during operation, and enhancing the explosion-proof effect and reliability of the switch box.

The invention discloses a preparation method of a porous aromatic framework material containing thiophene rings and adsorption application of sulfur dioxide and sulfur hexafluoride, and belongs to the technical field of porous organic material polymers. The porous organic polymer IMU-PAF-S with a high BET specific surface area is synthesized for the first time, and the S site of a thiophene ring in the material can effectively improve the adsorption capacity of SF6 and SO2. The obtained material has good thermal and chemical stability, the adsorption capacities of SF6 and SO2 at normal temperature and normal pressure (25 DEG C, 1 bar) reach 79.1 cm < 3 > g <-1 > and 333 cm < 3 > g <-1 >, and the highest record of the adsorption capacities of the two gases is created in the reported porous organic material. The porous aromatic framework material containing the thiophene ring provides a new thought for efficient adsorption of SF6 and SO2.

This invention discloses a method for preparing fluorophenylethane compounds, belonging to the field of organic chemical synthesis technology. The preparation method includes the following steps: mixing a photocatalyst 4CzIPN, a solvent DCE, a reducing agent DIPEA, and a reaction substrate, reacting them under blue light irradiation in a sulfur hexafluoride gas atmosphere; the reaction substrate is a compound with the structural formula [insert structural formula here], where R is H, an alkoxy group, or a cyano group. Beneficial effects: This invention uses sulfur hexafluoride as the fluorinating agent, selects a certain ratio of raw materials and catalyst, and efficiently prepares fluorophenylethane compounds. The reaction raw materials are inexpensive, the preparation process is safe and mild, has good substrate compatibility, and improves preparation efficiency.

The application discloses a method for preparing adifonine by using sulfur hexafluoride, which takes diethylaminoethanol and 2,2-diphenylacetic acid as raw materials, takes an alkaline substance as an additive, and carries out an esterification reaction in a solvent under the conditions of sulfur hexafluoride, a photocatalyst and light to obtain the adifonine. In the method, SF6 is activated under the photocatalysis condition, and the esterification reaction of 2,2-diphenylacetic acid is realized by using the decomposition product of SF6, so that the ester compound adifonine is obtained; the decomposition product of SF6 is used as a condensation reagent, the method effectively activates the greenhouse gas SF6, fully utilizes the decomposition product of SF6 to realize the esterification of the carboxylic acid to prepare the adifonine, and changes the SF6 into treasure from waste; the raw material required by the method is simple and easy to obtain, the reaction condition is simple, green and energy-saving, and the method has high application value.

The invention discloses a comprehensive performance evaluation method for sulfur hexafluoride substitute gas, and belongs to the field of SF6 substitute gas research. Aiming at the problems that the existing evaluation only focuses on the insulating property, low GWP and single dimension, the method comprises the following steps: taking SF6 as a reference, obtaining the insulating property (voltage endurance capability), thermal stability (overheating fault stability), material compatibility (suitability with copper / silver / gold / epoxy resin) and biotoxicity (degree of harm to a human body) parameters of the to-be-evaluated environment-friendly insulating gas, calculating the relative value lambda i of each property, and calculating the relative value lambda i of each property; and a comprehensive parameter H is obtained through a harmonic average formula. The application potential of the gas is judged according to the following conditions: H > = 1 (completely replacing SF6), 0.5 < = H < 1 (local replacement), and H < 0.5 (difficult replacement). The method is comprehensive in evaluation, high in universality and accurate in quantification, can support environmental protection gas engineering model selection, and assists the realization of an emission reduction target in the power industry.

The invention relates to the technical field of gas monitoring, in particular to a sulfur hexafluoride gas on-line monitoring system and method.The method specifically comprises the steps that a surface adsorption kinetic equation is constructed, and the real-time surface adsorption quantity of key components in an arc extinguish chamber to sulfur hexafluoride arc extinguish decomposers is obtained; calculating a metal vapor generation rate according to a thermal ablation item; establishing a physical evaluation model of the influence of the surface adsorption layer in the arc extinguish chamber on the flow field performance and the heat conduction performance, and evaluating to obtain a flow field distortion factor and a heat recovery retardation factor; combining the spatial position sensitive weight to predict the working performance degradation index of the sulfur hexafluoride; and according to the working performance degradation index of sulfur hexafluoride, performing triggering judgment of sulfur hexafluoride monitoring alarm. The problem that in the prior art, accurate prediction and early warning cannot be carried out on progressive degradation of the arc extinguishing capacity of the sulfur hexafluoride gas is solved.

The utility model provides a sulfur hexafluoride gas field sampling and testing device, which relates to the field of gas sampling and testing and comprises a sampling tank, a control valve and a sulfur hexafluoride tester are fixedly connected onto the sampling tank, the sulfur hexafluoride tester is positioned on one side of the control valve, and a collecting bag is fixedly arranged at the top of the inner wall of the sampling tank. The interior of the collecting bag is communicated with the control valve and the sulfur hexafluoride tester, and the vacuum pump is fixedly arranged on the sampling tank and is communicated with the interior of the collecting bag; according to the scheme, the collection bag is arranged in the sampling tank to sample gas, and when the vacuum pump is used for vacuumizing, interference of residual gas in the sampling process can be avoided, so that the purity of the sampled gas can be improved, and the accuracy and reliability of test data are ensured; and the situation that the accuracy of detection data is influenced by residual waste gas in the sampling bottle due to unsatisfactory vacuumizing effect caused by structural limitation of the sampling bottle is avoided as much as possible.