Weighing method-based gradient deflation type SF6 gas chamber volume measurement method

Abstract

The invention discloses a weighing method-based gradient deflation type SF6 gas chamber volume measurement method, belongs to the technical field of SF6 measurement equipment, and solves the problem of how to accurately and precisely measure and calculate the gas amount in an SF6 gas chamber of electrical equipment. A plurality of stages of deflation thresholds are distributed according to a pressure set value of the gas chamber, the gas chamber is deflated stage by stage, data are measured, the volume of the gas chamber and the internal original gas mass are calculated in each stage, and theaverage value of the data measured in each stage is distinguished, so that the problem that when the gas chamber is deflated due to 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, and the accuracy of a calculation result is improved; and the real-time pressure of the gas can be accurately measured, the deflation flow can be controlled when the pressure value is close to the set pressure value, the pressure sensor can conduct detection when the gas is stable, and the situation that the pressure in the gas chamber is reduced to an alarm value to give an alarm due to excessive gas release in the gas chamber is avoided.

Description

technical field [0001] The invention belongs to SF 6 Measuring equipment technical field, related to gradient degassing SF based on weighing 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 indicate t...

AI Technical Summary

Problems solved by technology

[0006] (1) Due to the limitation of the measurement accuracy of the pressure sensor, when the gas chamber is deflated, if the initial value is put into the set value at one time, 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 problem in the measurement. Large accidental errors make it difficult to accurately obtain real-time pressure values, and the accuracy of calculation results is difficult to guarantee

[0007] (2) In the process of deflation measurement, the existing device tends to release too much gas in the gas chamber, causing the pressure in the gas chamber to drop to the alarm value to issue an alarm

[0008] (3) During the dynamic process of deflation of the measuring device, because the gas is in a flowing state and the gas pressure is unbalanced, it is difficult for the pressure sensor to judge whether the current pressure has reached the target pressure, and measurement errors are prone to occur during the measurement process

Images