CN-122017135-A - Sulfur hexafluoride gas leakage detection method, device, system, medium and terminal based on self-adaptive adjustment sampling

CN122017135ACN 122017135 ACN122017135 ACN 122017135ACN-122017135-A

Abstract

The application provides a sulfur hexafluoride gas leakage detection method, device, system, medium and terminal based on self-adaptive adjustment sampling, wherein the method comprises the steps of obtaining sulfur hexafluoride gas concentration, gas temperature, gas flow and gas pressure data flowing into a sampling gas circuit from a leakage point to be detected after the current moment and the preset time are stabilized; and if the gas concentration is in the concentration detection interval, calculating to obtain a volume leakage rate based on a preset volume leakage rate calculation model and calculating to obtain a mass leakage rate based on a preset mass leakage rate calculation model according to the gas concentration, the gas temperature, the gas flow and the gas pressure data. The application can realize high-precision measurement with wide dynamic range and provide direct and accurate sulfur hexafluoride gas leakage rate quantification result.

Inventors

YANG QUANSHENG
Bi Fu
ZHAO DAN
HUANG YUEGANG

Assignees

朗松珂利(上海)仪器仪表有限公司

Dates

Publication Date: 20260512
Application Date: 20260123

Claims (10)

1. The sulfur hexafluoride gas leakage detection method based on self-adaptive regulation sampling is characterized by comprising the following steps of: Acquiring the concentration, the gas temperature and the gas flow of sulfur hexafluoride gas flowing into a sampling gas circuit from a leakage point to be detected after the current moment and the preset time are stabilized, and acquiring the pressure data in the sampling gas circuit; Judging whether the sulfur hexafluoride gas concentration is in a preset concentration detection interval, and if the sulfur hexafluoride gas concentration is not in the concentration detection interval, adjusting the sulfur hexafluoride gas concentration in the sampling gas circuit until the sulfur hexafluoride gas concentration is stably in the concentration detection interval; If the sulfur hexafluoride gas concentration is in the concentration detection range, calculating to obtain the sulfur hexafluoride gas volume leakage rate based on a preset volume leakage rate calculation model according to the sulfur hexafluoride gas concentration and the gas flow rate, and calculating to obtain the sulfur hexafluoride gas mass leakage rate based on a preset mass leakage rate calculation model according to the sulfur hexafluoride gas concentration, the gas temperature, the gas flow rate and the gas pressure data.
2. The method for detecting sulfur hexafluoride gas leakage based on adaptive regulation sampling according to claim 1, wherein if the sulfur hexafluoride gas concentration is not in the concentration detection zone, the specific process of regulating the sulfur hexafluoride gas concentration in the sampling gas path until it is stable in the concentration detection zone includes: if the concentration of the sulfur hexafluoride gas is lower than the lowest detection concentration of the concentration detection zone, the concentration of the sulfur hexafluoride gas in the sampling gas circuit is increased until the concentration detection zone is stabilized; and if the concentration of the sulfur hexafluoride gas is higher than the highest detection concentration of the concentration detection zone, reducing the concentration of the sulfur hexafluoride gas in the sampling gas circuit until the concentration detection zone is stabilized.
3. The adaptive sampling-based sulfur hexafluoride gas leakage detection method of claim 1, wherein the predetermined volumetric leakage rate calculation model is: ; Wherein, the The volume leakage rate is given in mL/s; sulfur hexafluoride gas concentration in ppm; the unit is mL/min.
4. The adaptive sampling-based sulfur hexafluoride gas leakage detection method of claim 1, wherein the predetermined mass leakage rate calculation model is: ; Wherein, the The mass leakage rate is expressed in g/y; sulfur hexafluoride gas concentration in ppm; The unit is mL/min; is air pressure data, and the unit is kPa; is the gas temperature in units of °c; the sampling frequency is the sampling frequency of the concentration of sulfur hexafluoride gas, and the unit is Hz; Time, in s.
5. Sulfur hexafluoride gas leakage detection device based on self-adaptive regulation sampling, which is characterized in that the detection device comprises: The data acquisition module is used for acquiring the concentration, the gas temperature and the gas flow of sulfur hexafluoride gas flowing into the sampling gas circuit from the leakage point to be detected after the current moment and the preset time are stabilized, and the gas pressure data in the sampling gas circuit; The concentration detection interval judging module is used for judging whether the concentration of the sulfur hexafluoride gas is in a preset concentration detection interval; The instruction control module is used for adjusting the sulfur hexafluoride gas concentration in the sampling gas circuit until the sulfur hexafluoride gas concentration is stably located in the concentration detection zone if the sulfur hexafluoride gas concentration is not located in the concentration detection zone, calculating the sulfur hexafluoride gas volume leakage rate based on a preset volume leakage rate calculation model according to the sulfur hexafluoride gas concentration and the gas flow rate if the sulfur hexafluoride gas concentration is located in the concentration detection zone, and calculating the sulfur hexafluoride gas mass leakage rate based on a preset mass leakage rate calculation model according to the sulfur hexafluoride gas concentration, the gas temperature, the gas flow rate and the gas pressure data.
6. The sulfur hexafluoride gas leakage detection system based on self-adaptive adjustment sampling, which is characterized by comprising a sulfur hexafluoride gas leakage detection device based on self-adaptive adjustment sampling, a sampling air pump and a sensor group device according to claim 5; the sampling air pump is used for adjusting the flow rate of the mixed gas flowing into the sampling air circuit so as to control the concentration of sulfur hexafluoride gas in the sampling air circuit; The sensor group device is used for collecting sulfur hexafluoride gas concentration, gas temperature and gas flow flowing into the sampling gas circuit at preset sampling time and air pressure data in the sampling gas circuit; The sulfur hexafluoride gas leakage detection device based on self-adaptive adjustment sampling is respectively connected with the sampling air pump and the sensor group device and is used for acquiring the sulfur hexafluoride gas concentration, the gas temperature and the gas flow which flow into a sampling gas path from a leakage point to be detected after the current time acquired by the sensor group device and the preset time are stabilized, judging whether the sulfur hexafluoride gas concentration is in a preset concentration detection range or not, adjusting the sulfur hexafluoride gas concentration in the sampling gas path until the sulfur hexafluoride gas concentration is stabilized in the concentration detection range based on the sampling air pump if the sulfur hexafluoride gas concentration is not in the concentration detection range, calculating to obtain the sulfur hexafluoride gas volume leakage rate based on a preset volume leakage rate calculation model according to the sulfur hexafluoride gas concentration, the gas temperature, the gas flow and the gas pressure data, and calculating to obtain the sulfur hexafluoride gas mass leakage rate based on a preset mass leakage rate calculation model if the sulfur hexafluoride gas concentration is in the concentration detection range.
7. The adaptive sampling based sulfur hexafluoride gas leak detection system of claim 6 wherein said sensor group means includes: the NDIR sulfur hexafluoride concentration sensor is used for collecting the concentration of sulfur hexafluoride gas flowing into the sampling gas circuit at a preset sampling moment; the temperature sensor is used for collecting the temperature of the gas flowing into the sampling gas circuit at a preset sampling moment; the flow sensor is used for collecting the gas flow flowing into the sampling gas circuit at a preset sampling moment; and the pressure sensor is used for acquiring air pressure data flowing into the sampling air circuit at a preset sampling moment.
8. The sulfur hexafluoride gas leakage detection system based on self-adaptive regulation sampling of claim 6, further comprising a man-machine interaction unit, and a sampling probe, a gas filtering device, a fluid controller and a tail gas device which are sequentially connected in a sampling gas path; Wherein the man-machine interaction unit is configured to perform man-machine interaction operation; the sampling probe is used for determining a leakage point to be detected and guiding sulfur hexafluoride gas leaked by the leakage point to be detected into the sampling gas circuit; The gas filtering device is used for filtering impurities in sulfur hexafluoride gas flowing into the sampling gas circuit; the fluid controller is used for stabilizing the airflow of sulfur hexafluoride gas flowing into the sampling gas circuit; the tail gas device is used for treating and discharging tail gas.
9. A computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the method according to any of claims 1 to 4.
10. An electronic terminal comprising a memory, a processor and a computer program stored on the memory, characterized in that the processor executes the computer program to implement the method of any of claims 1 to 4.

Description

Sulfur hexafluoride gas leakage detection method, device, system, medium and terminal based on self-adaptive adjustment sampling Technical Field The application relates to the technical field of insulating gas monitoring of electrical equipment, in particular to a sulfur hexafluoride gas leakage detection method, device, system, medium and terminal based on self-adaptive regulation sampling. Background Sulfur hexafluoride (SF 6) gas is widely used in high voltage power equipment due to its excellent insulation and arc extinguishing properties. If SF 6 is leaked, the insulation performance of the equipment is reduced, safety accidents are caused, and SF 6 is a powerful greenhouse gas, so that the leakage is harmful to the environment. Therefore, effective monitoring and accurate quantification of SF 6 leakage is critical. At present, the detection methods of SF 6 gas leakage and leakage rate commonly used in industry mainly comprise the following detection methods, but all have obvious disadvantages: (1) Qualitative leakage detecting method (such as infrared imaging method and laser leakage detecting method) is to scan the equipment with an imager and locate the leakage point through visual observation or signal feedback. However, the method can only qualitatively locate the leakage point, cannot quantitatively calculate the leakage rate, has a large influence on the detection result by the ambient wind speed, background interference and instrument sensitivity, cannot give accurate data of the leakage in grams per hour, and does not meet the requirements of quantitative management and environmental protection reporting. (2) The static pressure drop method is to monitor the change of the internal SF 6 gas pressure for a long time (such as hours to days) under the closed state of the equipment, and estimate the leakage rate through an ideal gas state equation. However, the method has extremely long detection period, low efficiency and extremely inaccuracy, and the measurement result is seriously affected by the fluctuation of the ambient temperature (the pressure change caused by the temperature change of 1 ℃ is possibly much larger than the change caused by leakage), so that the method cannot be used for rapid and on-site detection, and the real leakage and temperature effect cannot be distinguished. (3) The method comprises the steps of using a plastic cover to integrally seal equipment or components to be tested or locally wrap leakage points, and measuring the increase value of SF 6 gas concentration in the cover after a period of time accumulation to reversely push the leakage rate. However, the method is difficult to implement on site, has complex operation and low efficiency, is almost infeasible to manufacture a sealed cover for large-sized and complex-structure GAS Insulated switchgear (GAS Insulated SWITCHGEAR, GIS) equipment, has long accumulation time, is easily influenced by the permeability of the initial air in the cover and the cover, and has difficult guarantee of precision. (4) The conventional handheld leak detector inspection method uses a handheld SF 6 concentration sensor (such as an electrochemical sensor and an infrared sensor) to move along the surface of equipment to find a concentration peak point. However, the measured value of the method is only the concentration in the local environment, is greatly influenced by the distance, the wind speed and the direction of the probe, has poor repeatability, cannot be converted into the leakage rate, has slow response, is easy to exceed the measuring range of the sensor or is lower than the minimum detection limit, and has the reading of only the relative concentration of the ppm (parts per million parts per million) level, so that the leakage rate cannot be accurately calculated quantitatively. Therefore, it is necessary to provide a sulfur hexafluoride gas leakage detection method, device, system, medium and terminal based on adaptive regulation sampling, so as to solve the above-mentioned problems in the prior art. Disclosure of Invention In view of the above drawbacks of the prior art, the present application aims to provide a sulfur hexafluoride gas leakage detection method, device, system, medium and terminal based on adaptive adjustment sampling, which are used for solving the technical problem that the prior art cannot accurately and quantitatively calculate the leakage rate of SF 6. In order to achieve the above and other related objects, a first aspect of the present application provides a sulfur hexafluoride gas leakage detection method based on adaptive adjustment sampling, which includes obtaining sulfur hexafluoride gas concentration, gas temperature and gas flow flowing into a sampling gas path from a leakage point to be detected after a preset time and stabilizing gas pressure data in the sampling gas path, judging whether the sulfur hexafluoride gas concentration is in a preset concentration detection zone, if the sulfur hexaf