Rapid non-power-off quantitative detection method for gas leakage of gis equipment based on helium tracer
A quantitative detection method and technology for gas leakage, applied in the direction of detecting the appearance of fluid at the leak point, testing of fluid tightness, testing of machine/structural components, etc., can solve the problems of low leakage rate, difficult to measure, gas leakage, etc. achieve the effect of shortening the time
Active Publication Date: 2020-05-19
STATE GRID CORP OF CHINA +2
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[0005] The purpose of the present invention is to provide a rapid non-stop quantitative detection method for gas leakage of GIS equipment based on helium tracer, which is used to solve the problems that the low leakage rate is difficult to measure and the bandage method is required
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[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0026] S1. Before leak detection work, connect a high-precision electronic pressure gauge to the gas chamber inflation port of the GIS, and measure the gas pressure in the gas chamber as P 1 , ΔP is the partial pressure of helium in the gas chamber after helium is filled, and a certain amount of helium is filled until the pressure expression number is P 1 +ΔP, then the volume percentage τ of helium is
[0027]
[0028] S2. Use a dynamic gas distribution device to prepare different concentrations of helium with sulfur hexafluoride as the background gas by setting different gas flow rates. The gas outlet of the dynamic gas distribution device is connected to a standard leak generator that can adjust the flow rate to adjust the standard leak. The flow rate of the...
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The invention provides a rapid GIS equipment gas leakage non-power stop quantitative detection method based on a helium tracer. The method comprises steps that certain-amount helium is filled into a GIS gas chamber till the helium volume percent is tao; the relationship between the reading of a utilized vacuum helium mass spectrometer and a helium gas leakage rate is calibrated; the vacuum heliummass spectrometer starts for leakage detection work; a vacuum helium mass spectrometer probe is utilized to move along the surface of detected equipment; suspected leakage points are searched according to the apparatus response time and the probe moving speed, and the probe is made to sequentially stop at the suspected points and different positions nearby the suspected points; a probe suction inlet points to leakage points, the helium leakage rates of the leakage points are detected, the readings tend to be stable are recorded, and averaging is carried out; the leakage rate of the helium is reckoned. The method is advantaged in that quantitative detection on the leakage rate is carried out on the condition that local packaging is not carried out, the quantitative leakage detection time isshortened, and a problem that local packaging is required for quantitative gas leakage detection existing in GIS equipment in the prior art is solved.
Description
technical field [0001] The invention provides a quantitative detection method for gas leakage of GIS equipment based on helium tracer, in particular a method for directly and quickly measuring the gas leakage rate by using a vacuum helium mass spectrometer without power failure and local bandaging. Background technique [0002] With the continuous improvement of the grid voltage level and the continuous strengthening of the grid, the number of SF6 gas or SF6 / N2 mixed gas insulated electrical equipment is increasing. Since the insulating gas is in a positive pressure state when the GIS equipment is running, the insulation performance degradation caused by the gas leakage problem brings safety hazards to the operation of the equipment. The quantitative detection of the gas leakage rate is of great significance to ensure the safe and stable operation of the power grid. [0003] At present, the quantitative detection of the gas leakage rate of GIS equipment is generally based on...
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IPC IPC(8): G01M3/20
CPCG01M3/202G01M3/207
Inventor 蔡萱瞿子涵张驰彭天波张莹
Owner STATE GRID CORP OF CHINA