Device and method for checking SF6 gas leakage monitoring and alarming apparatuses

A calibration device, gas leakage technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as unrealistic, production safety hazards, protection, etc., and achieve the effect of easy portability and compact structure

Active Publication Date: 2011-01-12
GUANGXI POWER GRID ELECTRIC POWER RES INST
10 Cites 34 Cited by

AI-Extracted Technical Summary

Problems solved by technology

But since SF 6 The calibration of gas leak alarm requires a variety of different concentrations of SF 6 and O 2 Standard gas, it is extremely inconvenient and unrealistic to carry standard gases of various concentrations to the site, which makes it impossible for the power sector to carry out SF 6 On-site veri...
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Method used

7. air storage tank 32 stores the air that air pump 30 compresses, provides stable air pressure for system;
In SF6 standard gas dilution process, use pure air as diluting gas, can save the carrying of on-site air cylinder at device built-in miniature air pump (30), and reduced operating cost, is connected with gas storage tank in air system (32) and pressure controller (31), air filter (33), have guaranteed the stability of air pressure and the purification of air. Since the pressure generated by the air pump fluctuates to a certain extent, an air storage tank is placed behind the air pump and its internal pressure is detected by a pressure sensor to detect the operating status of the air pump in real time to ensure the normal operation of the system. An air purification device is installed at the back end of the gas storage tank to prevent the influence of pollution on the electronic mass flowmeter and improve the accuracy of flow control. The high-concentration SF6 standard gas uses nitrogen as the base gas, and the concentration is preferably 5%-20%. If the concentration is too high, the dilution ratio will be increased. When the dilution ratio is too large, it will be difficult to ensure the accuracy of gas distribution; if the concentration is too low, The dilution ratio is small, and it is easy to obtain high ga...
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Abstract

The invention discloses a device and method for checking SF6 gas leakage monitoring and alarming apparatuses. The device comprises precise electronic mass flow meters, solenoids, an air pump, a pressure controller, a quick connector, rotor flow meters, a control unit, a human-computer interface, a flow control valve and a connecting pipe. The high-concentration SF6 standard gas and air are mixed by the electronic mass flow meters and are diluted into the required SF6 standard gas with different concentrations and oxygen so as to achieve the requirements for accuracy and repeatability of detection of the monitoring and alarming apparatuses for checking the SF6 gas leakage. The device of the invention can avoid carrying plenty of steel cylinders for SF6 standard gases and diluent gases, has the characteristics of simpleness, rapidness, accuracy and high degree of automation and provides great convenience for checking the SF6 gas leakage monitoring and alarming apparatuses on site.

Application Domain

Material analysis

Technology Topic

Pressure controllerProcess engineering +10

Image

  • Device and method for checking SF6 gas leakage monitoring and alarming apparatuses
  • Device and method for checking SF6 gas leakage monitoring and alarming apparatuses

Examples

  • Experimental program(2)

Example Embodiment

[0042] Example 1
[0043] SF 6 Calibration of the concentration sensor 1500цl/l monitoring point
[0044] [Output flow 1000ml/min, concentration of SF 1500цl/l 6 gas]
[0045] 1. Turn on SF with a concentration of 10% 6 The valve of the standard gas cylinder 70 and the quick coupling 20 regulating valve, the SF is regulated by the pressure reducing valve 71 6 The gas pressure is 0.1MPa;
[0046] 2. Enter SF in the man-machine interface 51 of the calibration device 6 The concentration value of standard gas is 10%, SF that needs to be prepared 6 When the gas concentration value is 1500цl/l and the output flow value is 1000ml/min, press the start button, the micro air pump 30 starts;
[0047] 3. The control unit 50 calculates SF based on the above input value 6 The ratio of air distribution to air is 1500цl/l: 100000цl/l[10%]=3:200, SF 6 The required flow rates for air and air are 15ml/min and 985ml/min respectively, and the electronic mass flowmeter with a range of 20ml/min is automatically selected as the SF according to the flow rate. 6 Channel, select the electronic mass flow meter 3 with a range of 1000ml/min as the air channel respectively, send out control signals to open the solenoid valves 10, 12 and 14, close the solenoid valves 11, 13 and 15, and pass the electronic mass flow meters 1 and 3 Signal detection feedback real-time control of the output flow of the electronic mass flowmeter 1 and 3, after mixing through the output pipeline, the output flow is 1000ml/min and the concentration is 1500цl/l SF 6 gas;
[0048] 4. Put the calibration cavity (80) upside down on the SF of the alarm 6 On the sensor, make the calibration cavity (80) and the floor relatively sealed, adjust the rotameter 61 valve to control the flow required by the calibration cavity 80, in order to maintain the flow required for the calibration, you can adjust the rotameter 60 valve to remove the excess gas Discharged into the atmosphere;
[0049] 5. Maintain a certain time to make the SF of the calibration cavity 80 6 The gas concentration is stable, read SF on the display of the alarm 6 Concentration display value, read the output SF on the man-machine interface 51 of the calibration device 6 Concentration value, by comparing the difference between the two, the SF of the alarm can be determined 6 Concentration detection error.

Example Embodiment

[0050] Example 2
[0051] Calibration of the 15% oxygen concentration monitoring point of the oxygen concentration sensor
[0052] [Output flow rate is 1400ml/min, concentration is 15% oxygen]
[0053] 1. Turn on SF with a concentration of 10% 6 The valve of the standard gas cylinder 70 and the quick coupling 20 regulating valve, the SF is regulated by the pressure reducing valve 71 6 The gas pressure is 0.1MPa;
[0054] 2. Enter 21% of the oxygen concentration in the air, 15% of the oxygen concentration to be prepared, and an output flow value of 1400ml/min in the man-machine interface 51 of the calibration device, press the start button, and the air pump 30 starts;
[0055] 3. The control unit 50 calculates air and SF based on the above input values 6 The gas distribution ratio is 15%: 21% = 5: 7, SF 6 The required flow rates of air and air are 400ml/min and 1000ml/min respectively, and according to SF 6 The flow rate of 400ml/min is automatically selected, and the electronic mass flowmeter with a range of 500ml/min 2 transmits SF 6 , Choose 1000ml/min electronic mass flow meter 3 to transmit air, send out control signals to open solenoid valves 11, 12, 14 and 15, close solenoid valves 10 and 13, and real-time control through the signal detection feedback of electronic mass flow meters 2 and 3 The output flow of the electronic mass flow meters 2 and 3, after mixing through the output pipe, the output flow is 1400ml/min, the concentration is 15% oxygen;
[0056] 4. Put the calibration cavity (80) upside down on the SF of the alarm 6 On the sensor, make the calibration cavity (80) and the floor relatively sealed, adjust the rotameter 61 valve to control the flow required by the calibration cavity 80, in order to maintain the flow required for the calibration, you can adjust the rotameter 60 valve to remove the excess gas Discharged into the atmosphere;
[0057] 5. Maintain a certain period of time to stabilize the oxygen concentration in the calibration chamber 80, read the oxygen concentration display value on the display of the alarm, and read the output oxygen concentration value on the man-machine interface 51 of the calibration device. By comparing the difference between the two, the detection error of the oxygen concentration of the alarm can be determined.
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Description & Claims & Application Information

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