Micro-water sensor temperature aging and compensation device and test method thereof

Abstract

The present invention belongs to the field of micro-water transmitter aging devices, and particularly relates to a micro-water sensor temperature aging and compensation device and a test method thereof. A tank body (1) is provided with an inflation joint (3) and an exhaust joint (4); a micro-water sensor (5) is fixedly provided on an inflation self-sealing valve (301); an inlet of the micro-water sensor (5) is communicated with a cavity of the inflation self-sealing valve (301); an air inlet of a vacuum pump (6) is communicated with the cavity of the tank body (1); a temperature transmitter (7), a dew point sensor (8) and a pressure sensor (9) are fixedly provided in the tank body (1); signal transmission ports of the micro-water sensor (5), the temperature transmitter (7), the dew point sensor (8), the pressure sensor (9) and a display (2) are respectively connected to a signal transmission port of a control module. The present invention can perform multi-station synchronous measurement and calibration compensation for the micro-water sensor.

Description

Technical Field

[0001] The invention belongs to the field of micro-water transmitter aging devices, and in particular relates to a micro-water sensor temperature aging and compensation device and a testing method thereof. Background Art

[0002] The micro-water sensor is used to monitor the micro-water content, density, pressure, temperature and other data of SF6 gas in a closed container, and has a real-time remote monitoring function. The intelligent compensation technology can track the nonlinearity of SF6 gas pressure changes and micro-water content changes in real time, with accurate measurement and wide application. It is suitable for monitoring high-voltage systems. It can provide a variety of solutions such as supporting new substations and intelligent transformation of existing substations. The water molecules in the air around the sensor of the micro-water transmitter adhere to the inner wall of the sensor, electronic components and other surfaces, which will cause the micro-water content to be unable to balance with the micro-water value of the measured gas chamber for a long time in the early stage of use after the product leaves the factory, resulting in high detection data. In the prior art, there is no micro-water sensor temperature aging and compensation device that can perform multi-station synchronous measurement and calibration compensation for micro-water sensors. Summary of the invention

[0003] The present invention aims to overcome the deficiencies of the prior art and provide a micro-water sensor temperature aging and compensation device and a test method thereof which can perform multi-station synchronous measurement and calibration compensation for the micro-water sensor.

[0004] To solve the above technical problems, the present invention is achieved as follows:

[0005] A micro-water sensor temperature aging and compensation device comprises a tank body, a control module, a display and a vacuum pump; the tank body is provided with a control module and a display; the tank body is also provided with an inflation joint and an deflation joint; an inflation self-sealing valve and a deflation self-sealing valve are fixedly provided on the inflation joint and the deflation joint in sequence; a micro-water sensor is fixedly provided on the inflation self-sealing valve; the inlet of the micro-water sensor is communicated with the cavity of the inflation self-sealing valve; the cavity of the inflation self-sealing valve is communicated with the cavity of the tank body; the air inlet of the vacuum pump is communicated with the cavity of the tank body;

[0006] A temperature transmitter, a dew point sensor and a pressure sensor are fixedly arranged in the tank body; the signal transmission ports of the micro-water sensor, the temperature transmitter, the dew point sensor, the pressure sensor and the display are respectively connected to the signal transmission port of the control module.

[0007] As a preferred solution, the present invention fixes a fan in the central area of ​​the bottom of the tank body.

[0008] Furthermore, in the present invention, a PTFE tube is fixedly connected to the air inlet of the inflation self-sealing valve.

[0009] Furthermore, the present invention fixes and serially connects a PVC tube to the port of the PTFE tube.

[0010] The test method of the above-mentioned micro-water sensor temperature aging and compensation device can be implemented according to the following steps:

[0011] a. Place the dew point sensor in the tank, evacuate the tank at an ambient temperature of 60°C, and maintain the vacuum for one hour; stop evacuating and fill the container with high-purity nitrogen, and then continue evacuating until the vacuum is below 5Pa;

[0012] b. Fill the tank with high-purity nitrogen gas through the PTFE tube on the inflation self-sealing valve, open the deflation self-sealing valve to discharge the gas in the container, and turn on the fan to make the humidity uniform throughout the tank;

[0013] c. Adjust the gas injection with different water content by letting the moisture in the air penetrate into the PVC pipe;

[0014] d. When the output signal of the micro-water sensor reaches the required dew point value, the temperature reaches a constant value, and the pressure reaches the test value, the inflation self-sealing valve is closed to seal the tank;

[0015] e. Measure the dew point, pressure, and temperature output by the micro-water sensor, temperature transmitter, dew point sensor, and pressure sensor, and calculate the micro-water content and density value, and record and save the measurement and calculation results to make a change curve.

[0016] The present invention can be used for multi-parameter measurement and aging of HB5115 series micro-water sensors, and can perform multi-station synchronous measurement and calibration compensation for micro-water sensors. The present invention can collect, pre-process, set and transform engineering quantities of synchronous measurement data. It can perform historical storage and data reporting functions on data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. The protection scope of the present invention is not limited to the following description.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a plan view of the inflation joint and the deflation joint of the present invention.

[0020] Figure 3 This is a block diagram of the control circuit of the present invention.

[0021] In the figure: 1. Tank body; 2. Display; 3. Inflation connector; 301. Inflation self-sealing valve; 4. Deflation connector; 401. Deflation self-sealing valve; 5. Micro-water sensor; 6. Vacuum pump; 7. Temperature transmitter; 8. Dew point sensor; 9. Pressure sensor; 10. Fan; 11. PTFE tube; 12. Signal and power line outlet; 13. Sensor clip; 14. Flange. DETAILED DESCRIPTION

[0022] As shown in the figure, the temperature aging and compensation device of the micro-water sensor includes a tank body 1, a control module, a display 2 and a vacuum pump 6; an inflation joint 3 and an air release joint 4 are also provided on the tank body 1; an inflation self-sealing valve 301 and an air release self-sealing valve 401 are fixedly provided on the inflation joint 3 and the air release joint 4 in sequence; a micro-water sensor 5 is fixedly provided on the inflation self-sealing valve 301; the inlet of the micro-water sensor 5 is communicated with the cavity of the inflation self-sealing valve 301; the cavity of the inflation self-sealing valve 301 is communicated with the cavity of the tank body 1; the air inlet of the vacuum pump 6 is communicated with the cavity of the tank body 1;

[0023] A temperature transmitter 7, a dew point sensor 8 and a pressure sensor 9 are fixedly provided in the tank body 1; the signal transmission ports of the micro-water sensor 5, the temperature transmitter 7, the dew point sensor 8, the pressure sensor 9 and the display 2 are respectively connected to the signal transmission ports of the control module.

[0024] The present invention has a fan 10 fixedly disposed at the bottom center area of ​​the tank 1. The present invention has a PTFE tube 11 fixedly connected to the air inlet of the inflation self-sealing valve 301. The present invention has a PVC tube 12 fixedly connected in series to the port of the PTFE tube 11.

[0025] The test method of the above-mentioned micro-water sensor temperature aging and compensation device is implemented according to the following steps:

[0026] a. Place the dew point sensor 8 in the tank 1, evacuate the tank 1 at an ambient temperature of 60°C, and maintain the vacuum for one hour; stop evacuating and fill the container with high-purity nitrogen, and then continue evacuating until the vacuum is below 5Pa;

[0027] b. Fill the tank 1 with high-purity nitrogen gas through the PTFE tube 11 on the inflation self-sealing valve 301, and at the same time open the deflation self-sealing valve 401 to discharge the gas in the container, and turn on the fan 10 to make the humidity uniform throughout the tank 1;

[0028] c. Adjust the gas injected with different trace water values ​​by allowing the moisture in the air to penetrate into the PVC pipe 12;

[0029] d. When the output signal of the micro-water sensor 5 reaches the required dew point value, the temperature reaches a constant value, and the pressure reaches the test value, the inflation self-sealing valve 301 is closed to seal the tank body 1;

[0030] e. Measure the dew point, pressure and temperature output by the water sensor 5, temperature transmitter 7, dew point sensor 8 and pressure sensor 9, calculate the water content and density, and record and save the measurement and calculation results to make a change curve.

[0031] The present invention measures the micro-water transmitter under a certain pressure, records the drift values ​​of the dew point and pressure output by the micro-water transmitter as the temperature changes, compares and verifies the accuracy, and performs temperature compensation to realize the temperature compensation and aging work of the micro-water transmitter.

[0032] In specific design, the present invention mainly includes:

[0033] Tank, with built-in tested dew point sensor as standard dew point measurement, a pressure sensor and a temperature sensor as temperature and pressure measurement.

[0034] A built-in fan is used to stir the gas in the container to make it evenly humidified when it rotates.

[0035] The tank top cover is equipped with a valve seat for supplying the signal and power supply lines of the micro-water sensor, temperature sensor, pressure transmitter and fan to the sealed container.

[0036] A self-sealing valve is installed on the top cover of the tank body to inflate and deflate the container.

[0037] The inflation pipeline is a polytetrafluoroethylene (PTFE) tube, which is filled with pure high-purity nitrogen gas with low moisture content. There are also pipelines connected in series with PVC pipes to fill gases containing different moisture contents. The humidity can be adjusted by the length and time of the PVC pipe.

[0038] Temperature box, the space can be filled with the pressure inside the sealed container, the temperature range includes -30℃~50℃

[0039] There is an independent movable vacuum unit, which mainly includes vacuum measurement system, vacuum chamber, mechanical pump, molecular pump, valve and vacuum pipeline, and electronic control system, which is used to evacuate the tank. The vacuum degree limit of the unit itself can reach ≤9*10 -5 Pa

[0040] The data acquisition cabinet can collect, display and record the pressure, temperature and dew point signals of each sensor and calculate the PPM value of the micro-water content.

[0041] Testing process:

[0042] (1) Place the dew point sensor to be measured in the above tank, connect the signal line, seal the container, and place it in a thermostat. Pump the container at 60°C and maintain the vacuum for one hour. Stop pumping and fill the container with high-purity nitrogen. Continue to pump until the vacuum is below 5Pa. Repeat several times to remove the water vapor in the container.

[0043] Vacuum unit operating procedures:

[0044] a. After the vacuum pipeline is connected to the tank, open the manual valve of the vacuum unit.

[0045] b. Press the "Mechanical Pump On" button on the main power panel to start the machine. At this time, the mechanical pump button indicator light will turn on.

[0046] c. After the fore-stage vacuum reaches the requirement (wait for the low vacuum part of the vacuum gauge to display <10Pa), turn on the molecular pump power, press the molecular pump start power button to start the molecular pump.

[0047] d. Wait for 3 to 5 minutes for the molecular pump to reach normal speed and then achieve normal operation.

[0048] e. Press the "ON IONIZATION" button on the ionization part of the vacuum gauge control power supply and observe the vacuum value of the vacuum gauge.

[0049] f. After the experiment, turn off the vacuum valve of the unit, remove the connection with the tank pipe, turn off the ionization part of the vacuum gauge, stop the mechanical pump after the molecular pump stops, turn off the power of the molecular pump, and turn off the power of the control system.

[0050] (2) Fill the tank with high-purity nitrogen gas, open the vent valve to discharge the gas in the tank, and turn on the fan to make the humidity uniform throughout the tank.

[0051] (3) When different trace water values ​​need to be filled, PVC pipes of different lengths can be connected in series in the air inlet pipe, and the trace water value of the air intake can be controlled by injecting gas flow. When the output signal of the trace water sensor reaches the required dew point value, the temperature reaches a constant value, and the pressure reaches the test value, the filling and discharging valves are closed to make the container airtight.

[0052] (4) Under the above working conditions, measure the dew point, pressure, and temperature output by the sensor, and calculate the trace water content and density value through the software. The measurement and calculation results are recorded and saved to make a change curve.

[0053] (5) Repeat step 2 for different measuring points. After the temperature remains constant for 3 hours, repeat step 3.

[0054] (6) According to the change of temperature, the drift value of dew point and pressure output by the micro-water transmitter is compared and verified to verify its accuracy, find out the change law, and perform temperature compensation to realize the temperature compensation and aging work of the micro-water transmitter.

[0055] The inflatable self-sealing valve and the deflated self-sealing valve of the present invention adopt a universal SF6 self-sealing valve, and of course other universal micro-water density sensor self-sealing valve products can also be used. When the air pressure at the port of the self-sealing valve changes, the spring acts on the valve core and the retaining ring, thereby automatically controlling the opening of the self-sealing valve. The end of the valve core corresponds to the tank cavity, and the retaining ring corresponds to the micro-water sensor cavity.

[0056] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0057] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "setting", "connection", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A test method using a micro-water sensor temperature aging and compensation device, characterized in that: The micro-water sensor temperature aging and compensation device comprises a tank body (1), a control module, a display (2) and a vacuum pump (6), and is characterized in that: an inflation joint (3) and an deflation joint (4) are also provided on the tank body (1); an inflation self-sealing valve (301) and a deflation self-sealing valve (401) are fixedly provided on the inflation joint (3) and the deflation joint (4) in sequence; a micro-water sensor (5) is fixedly provided on the inflation self-sealing valve (301); an inlet of the micro-water sensor (5) is communicated with the cavity of the inflation self-sealing valve (301); the cavity of the inflation self-sealing valve (301) is communicated with the cavity of the tank body (1); The air inlet of the vacuum pump (6) is in communication with the cavity of the tank body (1); a temperature transmitter (7), a dew point sensor (8) and a pressure sensor (9) are fixedly arranged in the tank body (1); the signal transmission ports of the micro-water sensor (5), the temperature transmitter (7), the dew point sensor (8), the pressure sensor (9) and the display (2) are respectively connected to the signal transmission port of the control module; a fan (10) is fixedly arranged in the central area of ​​the bottom of the tank body (1); a PTFE tube (11) is fixedly connected to the air inlet of the inflation self-sealing valve (301); and a PVC tube (12) is fixedly connected in series to the end of the PTFE tube (11); The test method is implemented as follows: (1) Place the dew point sensor to be measured in the above tank, connect the signal line, seal the container, put it in a temperature box, and evacuate the container at 60°C. Maintain the vacuum for one hour, stop evacuating and fill the container with high-purity nitrogen, and then continue to evacuate until the vacuum is below 5Pa. Repeat several times to remove the water vapor in the container. Vacuum unit operation steps: a. After the vacuum pipeline is connected to the tank, open the manual valve of the vacuum unit; b. Press the "Mechanical Pump On" button on the main power panel to start the mechanical pump. Then the mechanical pump button indicator light will turn on; c. Wait for the low vacuum part of the vacuum gauge to display <10Pa. After the fore-stage vacuum reaches the requirement, turn on the molecular pump power supply and press the molecular pump start power button to start the molecular pump; d. Wait for 3 to 5 minutes for the molecular pump to reach normal speed and achieve normal operation; e. Press the "ON IONIZATION" button on the ionization part of the vacuum gauge control power supply and observe the vacuum value of the vacuum gauge; f. After the experiment, close the vacuum valve of the unit, disconnect the pipe connection with the tank, turn off the ionization part of the vacuum gauge, stop the mechanical pump after the molecular pump stops, turn off the power of the molecular pump, and turn off the power of the control system; (2) Fill the tank with high-purity nitrogen gas, open the venting self-sealing valve to discharge the gas in the tank, and turn on the fan to make the humidity uniform throughout the tank; (3) When different trace water values ​​need to be filled, connect PVC pipes of different lengths in series in the air inlet pipe and control the trace water value of the air by injecting gas flow. When the output signal of the trace water sensor reaches the required dew point value, the temperature reaches a constant value, and the pressure reaches the test value, close the filling and discharging valve to make the container airtight; (4) Under the above working conditions, measure the dew point, pressure and temperature output by the sensor, calculate the water content and density value through the software, and record and save the measurement and calculation results to make a change curve; (5) Repeat step (2) for different measurement points, and repeat step (3) after the temperature remains constant for 3 hours; (6) According to the change of temperature, the drift value of dew point and pressure output by the micro-water transmitter is compared and verified to verify its accuracy, find out the change law, and perform temperature compensation to realize the temperature compensation and aging work of the micro-water transmitter.

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