Constant-volume inflating and deflating measuring device for SF6 air chamber

Abstract

The invention discloses a constant-volume inflation and deflation measuring device for an SF6 gas chamber, belongs to the technical field of SF6 equipment, and solves the problem of how to design a device capable of accurately measuring the volume of gas in the SF6 gas chamber when the pressure in the SF6 gas chamber is low or high. When the pressure in the SF6 gas chamber is too high, deflation measurement is carried out, and when the pressure in the SF6 gas chamber is too low, inflation measurement is carried out. The measuring device cannot measure the pressure in the SF6 gas chamber undertwo conditions at the same time, and the application range is wide. The constant-volume inflation and deflation tank is adopted to replace a weighing device, temperature and pressure measurement underdifferent conditions is achieved through a temperature sensor, a pressure sensor and a control valve set, the weighing device does not need to be carried to the site to weigh a gas steel cylinder, and the device is simple in structure and convenient to install.

Description

technical field [0001] The invention belongs to SF 6 Equipment technical field, specifically relate to a kind of SF 6 Air chamber constant volume filling and deflation measuring device. 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 indicate the gas consumpti...

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Problems solved by technology

[0006] (1) SF of electrical equipment in operation 6 The volume inside the gas chamber is measured when there is SF 6 The pressure in the air chamber is high or low, SF 6 When the pressure in the air chamber is too high, it needs to deflate, SF 6 When the pressure in the air chamber is low, it needs to be inflated; the above device can only be used for SF 6 The gas chamber is inflated to measure, and the SF in both cases cannot be measured at the same time 6 pressure in air chamber

[0007] (2) Use a weighing device to determine the charged SF 6 gas volume, but the original SF in the gas chamber cannot be known 6 The amount of gas cannot be effectively measured for the internal volume of the gas chamber.

Moreover, the load cell is easily affected by foreign factors and has poor stability

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