Gradient inflatable SF6 gas chamber volume measurement method based on constant volume method

Abstract

The invention discloses a gradient inflatable SF6 gas chamber volume measurement method based on a constant volume method, belongs to the technical field of SF6 measurement equipment, and solves the problem of how to accurately and precisely measure and calculate the internal volume of a gas chamber of electrical equipment; firstly, the volume of a constant volume inflation tank is calibrated; a plurality of stages of inflation thresholds are distributed according to a pressure set value of the gas chamber, the gas chamber is inflated in stages, data are measured, the volume of the gas chamberand the internal original gas mass are calculated in each stage, and the average value of the data measured in each stage is calculated, so that the problem that when the gas chamber is inflated dueto measurement accuracy limitation of a pressure sensor, large accidental errors are caused by one-time measurement from an initial value to a set value is solved, the accuracy of a calculation resultis improved, potential safety hazards caused by too high gas pressure due to the fact that the gas chamber is filled with too much gas are avoided, the whole measurement process is short in time, andthe risk that the insulating property is reduced due to the fact that the gas pressure in the gas chamber is reduced is avoided.

Description

technical field [0001] The invention belongs to SF 6 Technical field of measuring equipment, related to gradient gas-filled SF based on constant volume method 6 Method for the determination of air chamber volume. Background technique [0002] Sulfur hexafluoride (SF 6 ) gas has been widely used in high and medium voltage electrical equipment due to its excellent insulation and arc extinguishing properties. According to statistics, the global sulfur hexafluoride (SF 6 ) gas output is about 20,000 tons, about 80% of which are used in the power industry. With the construction and operation of a large number of AC / DC UHV projects, SF 6 The amount of gas used is increasing. But SF 6 The greenhouse gas is CO 2 It can exist in the air for more than 3200 years. It is one of the six gases prohibited by the Kyoto Protocol. [0003] The amount of sulfur hexafluoride electrical equipment in the power industry is huge, and most of the nameplates of the operating equipment do not...

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Problems solved by technology

[0006] (1) Due to the limitation of the measurement accuracy of the pressure sensor, when the gas chamber is inflated, if it is charged from the initial value to the set value at one time, and a measurement is performed and the volume of the gas chamber and the initial gas mass in the gas chamber are calculated, there must be a large gap in the measurement Due to accidental errors, it is difficult to accurately measure the real-time pressure value, and the accuracy of the calculation results is difficult to guarantee

[0007] (2) When there is a part of gas in the gas chamber, at this time, the device supplements a part of the gas into the gas chamber to increase the gas pressure in the gas chamber, but cannot effectively know the original SF in the gas chamber 6 The gas volume cannot be accurately measured and calculated for the internal volume of the gas chamber; it is necessary to carry a weighing device to the site to weigh the gas cylinder, which is inconvenient to transport, and the geographical location of each place is different, and the gravity coefficient is different due to differences in altitude, which makes it pass the test. Gravity-derived mass is off

[0008] (3) For some small SF6 electrical equipment, gas cylinders are used to directly inflate them. Due to the high pressure of the gas cylinders, it is easy to inflate for small SF6 electrical equipment. Overvoltage, causing an overvoltage hazard

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