Method and device for measuring gas mixing ratio of binary mixed gas based on gas substitution method

Abstract

The invention discloses a method and device for measuring the gas mixing ratio of binary mixed gas based on a gas substitution method, belongs to the technical field of electric power system detection, and aims to solve the problem of how to measure the gas mixing ratio of binary mixed gas by adopting a gas substitution method. According to the technical scheme, on the basis of the principle of measuring the density of mixed insulating gas, the gas mixing ratio of the mixed insulating gas is measured by adopting a gas substitution method, so that the gas mixing ratio of the existing binary mixed gas can be measured, full-scale (0-100%), high-precision, linear, normal-pressure and under-pressure measurement can be realized, the gas mixing ratio detection of other non-insulating binary mixed gas can be met, the application range is wide, pure component gas is directly used for participating in the test, component selection is flexible, standard gas does not need to be prepared, and the test cost is low.

Description

technical field [0001] The invention belongs to the technical field of power system detection, and relates to a method and device for measuring the mixing ratio of a binary mixed gas based on a gas substitution method. Background technique [0002] SF 6 Gas is currently the gas insulation medium with the best performance. Under the same pressure, the insulation performance is about 2.5 times that of air, and the arc extinguishing performance is 100 times that of air. It is widely used in electrical equipment of various voltage levels, effectively reducing electrical The volume of the equipment reduces the footprint of the equipment and prolongs the maintenance cycle of the equipment. [0003] However, SF 6 There are also obvious flaws, SF 6 It is a strong greenhouse effect gas, and the equivalent greenhouse effect is CO 2 23,900 times that of carbon dioxide, and its lifespan in the atmosphere is about 3,200 years. Emissions into the atmosphere will have a serious impact ...

AI Technical Summary

Problems solved by technology

Among them, chromatography has high accuracy, but its disadvantages are slow analysis speed, complex operation, harsh environmental requirements, power supply and carrier gas, etc.

The thermal conductivity detection method is only suitable for the detection of the gas mixture ratio of the binary mixed insulating gas, and cannot measure the gas mixture ratio of the ternary mixed insulating gas, and the detection accuracy is low. The sensor is prone to drift after long-term use, and regular calibration is required

Infrared spectroscopy has low detection accuracy and is susceptible to external interference. As the service life increases, the performance of the instrument decreases, and the detection accuracy decreases. At the same time, the instrument cannot be used for non-SF 6 Mixed gas (such as C 4 f 7 N and CO 2 Mixed gas) gas mixture ratio detection

Literature "Design of an Ultrasonic Measuring Instrument for Binary Mixed Gas Concentration" (Wang Mingwei, Yao Zhan. Design of an Ultrasonic Measuring Instrument for Binary Mixed Gas Concentration[J]. Computer Measurement and Control, 2010,18(12):2908 -2910.) Disclosed the theory that there is a certain relationship between the sound velocity and the concentration and temperature of the binary mixed gas to be measured when the ultrasonic wave propagates in the binary mixed gas, and improved the calculation formula for the ultrasonic detection of the gas concentration of the binary mixed gas , proposed a new temperature measurement method; but this literature did not solve how to measure the mixing ratio of binary mixed gas

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