CN101424596B - Calibration stand and calibration method for SF6 gas density and pressure monitoring device - Google Patents

Abstract

The invention discloses a calibration stand of an SF6 density-pressure monitoring device, which saves time and labor and has accuracy and high efficiency. The device comprises a high and low temperature box, an operating console, an operating cabinet connected at the rear end of the operating console, and a host arranged on the operating cabinet, wherein the host comprises a plurality of parallelconnection interfaces of the SF6 density-pressure monitoring device to be tested, a gas circuit control system connected with the interfaces of the SF6 density-pressure monitoring device to be tested, a computer, a touch display screen and a printer, wherein the touch display screen and the printer are connected with the computer, the gas circuit control system comprises a vacuum pump, a gas storage cylinder, a work gas cylinder and a driving motor. The device has high calibration accuracy and can recycle SF6 used for calibration testing. The invention also discloses a calibration method of the SF6 density-pressure monitoring device.

Description

Calibration platform and calibration method of SF6 gas density-pressure monitoring device

technical field

The invention relates to a comprehensive calibration equipment for an electrical device, in particular to a calibration platform and a calibration method for an SF ₆ gas density-pressure monitoring device.

Background technique

SF ₆ gas density-pressure monitoring device (SF ₆ density relay) has been widely used in electrical engineering such as high-voltage power distribution switches, high-voltage power distribution equipment, and high-power transformers, which has promoted the rapid development of the power industry. The SF ₆ gas density-pressure monitoring device is one of the key components of the _{electrical switch. It is used to monitor the change of the SF 6 gas} density in the body of the SF 6 electrical equipment. Its good performance directly affects the safe and reliable operation of the SF ₆ electrical equipment. . The SF ₆ gas density-pressure monitoring device installed on the site does not operate frequently, and after a period of time, it often has the phenomenon of inflexible action or poor contact of the contacts, and some may also have poor temperature compensation performance. It is easy to cause misoperation of the SF ₆ gas density-pressure monitoring device, so the electric power department stipulates an experimental procedure: each SF ₆ electrical switch user unit must regularly calibrate the SF ₆ gas density-pressure monitoring device.

At present, the calibrating instrument of the SF ₆ density-pressure monitoring device in China is a portable calibrator that can be taken to the site for inspection. This calibrator has the following disadvantages:

1. It is still relatively backward in terms of testing methods and testing accuracy.

2. It is difficult to disassemble and assemble the primary inflation interface and the secondary wiring interface. If there are batches of density relays to be replaced, it is very difficult to calibrate on site. The replaced density relays can only be placed in a constant temperature laboratory for comprehensive calibration. Calibration on the test bench.

3. The pressure value at ambient temperature can only be verified on site, and then the pressure value at this temperature is converted to the equivalent pressure value at 20°C, and then the relative pressure value at 20°C is used as the standard value to judge the density relay Therefore, the temperature compensation performance of the density relay cannot be verified.

4. The SF ₆ gas used for testing cannot be recovered.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a time-saving, labor-saving, accurate and efficient SF ₆ gas density-pressure monitoring device calibration platform and calibration method. The accuracy of the calibration of the device is high, and the calibration test The SF ₆ gas used can be recovered.

A kind of technical scheme that realizes the object of the present invention is: a kind of SF ₆ gas density-pressure monitoring device checkout platform, comprises a high and low temperature box, an operation platform, an operation cabinet connected to the operation platform rear end, and a set on the operation cabinet The host computer, the host computer includes the interface of several measured SF ₆ gas density-pressure monitoring devices connected in parallel, a gas circuit control system connected to the interface of the measured SF ₆ gas density-pressure monitoring device, a computer, and a computer A connected touch display screen and a printer, the air circuit control system includes a vacuum pump, an air storage cylinder, a working cylinder and a drive motor, wherein,

The vacuum pump is sequentially connected with the atmospheric pressure sensor, the vacuum pump solenoid valve, the pipeline pressure sensor, the temperature sensor and the input port of the interface switching valve through the first pipeline, and the output port of the interface switching valve is connected with the measured SF ₆ gas density-pressure monitoring the interface connection of the device;

The air storage cylinder is connected to the input port of the air storage cylinder pressure sensor, the air storage cylinder switch valve and the air storage cylinder solenoid valve in sequence through the second pipeline, and the output port of the gas storage cylinder solenoid valve is connected to the working cylinder;

The working cylinder is connected to the input port of the main solenoid valve of the gas circuit and the main switching valve of the gas circuit in turn through the third pipeline, and the output port of the main switching valve of the gas circuit is connected with the first pipeline and is located between the temperature sensor and the pipeline pressure sensor. between;

The output shaft of the drive motor is connected with the piston of the working cylinder;

The vacuum pump electromagnetic valve, the air storage cylinder electromagnetic valve, the main air circuit solenoid valve, the driving motor, the atmospheric pressure sensor, the pipeline pressure sensor, the air storage cylinder pressure sensor and the temperature sensor are respectively connected to the computer through the test signal line;

The computer is connected with the measured SF ₆ gas density-pressure monitoring device through a test signal line.

In the calibration platform of the above-mentioned SF ₆ gas density-pressure monitoring device, a frequency converter is connected to the drive motor, and the frequency converter is connected to a computer through a test signal line.

In the verification platform of the above-mentioned SF ₆ gas density-pressure monitoring device, the computer is also connected to an alarm driving device through a signal line.

Any one of the above-mentioned SF ₆ gas density-pressure monitoring device calibration platform, wherein,

The touch display screen is arranged on the front panel of the operation cabinet, and the panel is also provided with a power indicator light, a power switch, an alarm indicator light and an alarm buzzer;

The interface of the measured _SF6 gas density-pressure monitoring device and the interface switching valve are arranged in a window provided on the side panel of the operation cabinet;

The on-off valve of the gas storage cylinder and the main on-off valve of the gas path are arranged in another window opened on the side panel of the operation cabinet;

The printer is arranged in a window opened on the other side panel of the operation cabinet.

Another kind of technical scheme that realizes the object of the present invention is: a kind of SF ₆ gas density-pressure monitoring device verification method, is implemented in the verification platform of above-mentioned SF ₆ gas density-pressure monitoring device, and this method comprises the following steps:

Step 1, install the SF ₆ gas density-pressure monitoring device to be tested on the interface of the calibration platform, and connect to the computer through the test signal line;

Step 2, open the main on-off valve of the air circuit and the on-off valve of the gas storage cylinder, and the touch screen displays the initial interface of the test;

Step 3: According to the interface prompts on the touch screen, perform the following steps on the air circuit control system:

a. The pipeline is vacuumed only when the main engine is just turned on. First, set the vacuum degree parameter, manually open the vacuum pump solenoid valve and start the vacuum pump, and then vacuumize the first pipeline and the air storage cylinder;

b. Supplement gas to the gas storage cylinder, use an external gas cylinder to replenish SF ₆ gas to the gas storage cylinder, the pressure of the inflated gas is not greater than 1.3MPa, and the solenoid valve of the gas storage cylinder will automatically close after the inflation is completed, and it will be closed after the touch screen jumps out of the reset window Interface switch valve;

c. Add air to the working cylinder, start the drive motor so that the piston of the working cylinder is located in the middle of the working cylinder, at this time, the solenoid valve of the air storage cylinder is opened, and the air storage cylinder is used to add air to the working cylinder;

Step 4, collect and set calibration parameters according to the interface prompts on the touch screen:

a. Click the contact test button, first select the type of SF ₆ gas density-pressure monitoring device to be tested and whether it has a high-pressure alarm, and then set the rated pressure value and contact setting value;

b. Collect the ambient temperature value through the temperature sensor and input it to the computer;

c. The pipeline pressure value is collected by the pipeline pressure sensor and input to the computer, and the computer controls the pipeline pressure to reach the range of the set value;

Step 5, performing a contact performance test at normal temperature on the measured SF ₆ gas density-pressure monitoring device;

Step 6, placing the measured SF ₆ gas density-pressure monitoring device in a high and low temperature box to detect its contact performance at high and low temperatures;

Step 7, recovering SF _gas for detection;

Step eight, print the report and judge whether the tested SF ₆ gas density-pressure monitoring device is qualified.

The verification method of the above-mentioned SF ₆ gas density-pressure monitoring device, wherein, when performing said step five: first input the various standard values of the device under test into the information input box on the interface and click OK, then The computer pressurizes the SF ₆ gas density-pressure monitoring device under test. After the pressurization exceeds the rated density value or reaches the high pressure alarm value, it returns to decompression. When it returns to the rated density value, the actual indication of the device under test is visually observed. value and input to the information input box that appears on the interface, and then continue to return, when it returns to less than the blocking value of the device under test, pressurize again and repeat the above test, repeating a total of three times, and finally carry out the system according to the recorded contact value analyze.

The above method for verifying the SF ₆ gas density-pressure monitoring device, wherein, when performing the sixth step: first select the test temperature and input the rated pressure value and contact setting value, and then click the corresponding high and low temperature detection button to start The detection procedure is the same as step five; the adjustment temperature of the high and low temperature box is -30°C to 70°C.

The verification method of the above-mentioned SF ₆ gas density-pressure monitoring device, wherein, when performing the step 7, it needs to be carried out after the entire detection is completed: the piston movement of the working cylinder is controlled by the computer, so that the gas in the pipeline is returned to the In the working cylinder and close the main solenoid valve of the air circuit;

The calibration method of the above SF ₆ gas density-pressure monitoring device, wherein the ambient temperature sensed by the temperature sensor is -10°C to 60°C; the accuracy of the pipeline pressure sensor is 0.25.

SF of the present invention The technical scheme of the calibration platform of _gas density-pressure monitoring device has following advantages:

1. A high degree of automation through computer-controlled verification and testing operations;

2. The working cylinder is monitored by an intelligent pressure sensor, and the motor is controlled by a microcomputer instead of manual operation, which saves time and effort, and is accurate and efficient;

3. It integrates vacuuming, inflation and gas supply, and realizes intelligent automatic inflation of the SF ₆ gas density-pressure monitoring device through computer control, so as to carry out high and low temperature temperature compensation tests;

4. Use the computer display screen equipped with touch screen, which is convenient, fast and intuitive;

5. 2 to 4 SF ₆ gas density-pressure monitoring devices of the same type can be tested in batches at the same time;

6. Realize the record query, analysis and statistics, and report output of historical data through the computer; through the configuration software programming, realize the vivid, vivid, intuitive and friendly operation control interface;

7. The SF ₆ gas used in the verification test in the operating table can be recycled;

8. It has sound and light alarm functions that can be freely selected.

Description of drawings

Fig. 1 is SF of the present invention ₆ The structure schematic diagram of the checking platform of gas density-pressure monitoring device;

Fig. 2 is the schematic diagram of the gas circuit control system of the checking platform of _SF gas density-pressure monitoring device of the present invention;

Fig. 3 is a schematic diagram of the functional structure of the calibration platform of the SF ₆ gas density-pressure monitoring device of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific examples.

Please refer to Fig. 1, the _SF6 gas density of the present invention-the check platform of pressure monitoring device, comprises a high and low temperature box (not shown in the figure), an operation platform 1, an operation cabinet 2 connected at the operation platform 1 rear end, One is located at the main engine on the operation cabinet 2, and this main engine comprises the interface 3 of some measured _SF6 gas density-pressure monitoring devices connected in parallel, one is connected with the interface 3 of measured _SF6 gas density-pressure monitoring device 10. road control system, a computer, a touch screen 4 connected to the computer and a printer 5; the touch screen 4 is arranged on the front panel 20 of the operation cabinet 2, and the panel 20 is also provided with a power indicator light 201, a power supply Switch 202, warning indicator light 203 and warning buzzer 204; Printer 5 is arranged in a window that offers on the right side panel 21 of operation cabinet 2.

Please refer to Fig. 2 again, the gas path control system includes a vacuum pump 6, an air storage cylinder 7, a working cylinder 8 and a driving motor 9, wherein,

The vacuum pump 6 is sequentially connected to the atmospheric pressure sensor 61, the vacuum pump solenoid valve 62, the pipeline pressure sensor 63, the temperature sensor 64 and the input port of the interface switch valve 65 through the first pipeline 60, and the output port of the interface switch valve 65 is connected to the measured SF ₆ The interface 3 of the gas density-pressure monitoring device 10 is connected; the interface 3 and the interface switching valve 65 of the measured SF ₆ gas density-pressure monitoring device 10 are arranged in a window opened on the left side panel 22 of the operation cabinet 2;

Atmospheric pressure sensor 61 senses the ambient pressure and is used to adjust the initial value of the measured SF ₆ gas density-pressure monitoring device; the temperature sensor 64 collects the ambient temperature value and inputs it to the computer for the pressure measured at the current ambient temperature The value is converted to the pressure value at room temperature of 20°C, and the computer compares the pressure value with the standard pressure value at room temperature of 20°C; the pipeline pressure sensor 63 senses the pipeline pressure value and inputs it to the computer for the current pipeline Pressure is compared with the pressure shown by the pointer of the measured SF ₆ gas density-pressure monitoring device, thereby obtaining the effect of verification; the accuracy of the pipeline pressure sensor 63 is greater than the accuracy of the measured SF ₆ gas density-pressure monitoring device, the present invention The accuracy of the pipeline pressure sensor 63 in the calibration platform is 0.25, which is much higher than that of the measured SF ₆ gas density-pressure monitoring device with a general accuracy of 1.5, so the calibration quality is accurate and efficient;

The air storage cylinder 7 is connected with the input port of the air storage cylinder pressure sensor 71, the air storage cylinder switch valve 72 and the air storage cylinder electromagnetic valve 73 successively through the second pipeline 70, and the output port of the air storage cylinder electromagnetic valve 73 is connected with the working cylinder 8; The sensor 71 senses the pressure value of the air storage cylinder 7 and inputs it to the computer for controlling the pressure of the air storage cylinder 7;

The working cylinder 8 is connected to the input port of the main solenoid valve 81 and the main switch valve 82 of the gas circuit through the third pipeline 80, and the output port of the main gas switch valve 82 is connected with the first pipeline 60 and located at the temperature sensor 64. Between the pipeline pressure sensor 63;

The gas storage cylinder switch valve 72 and the main gas circuit switch valve 82 are arranged in another window opened on the side panel 22 of the operation cabinet 2;

The output shaft of the driving motor 9 is connected with the piston 83 of the working cylinder 8, and the left and right movement of the piston 83 is controlled by the driving motor 9; a frequency converter 90 is also connected on the driving motor 9, and the frequency converter 90 is connected with a computer by a test signal line.

Vacuum pump solenoid valve 62, gas storage cylinder solenoid valve 73, gas path main solenoid valve 81, drive motor 9, atmospheric pressure sensor 61, pipeline pressure sensor 63, gas storage cylinder pressure sensor 71 and temperature sensor 64 are respectively connected to the computer through test signal lines ;

The computer is connected with the measured SF ₆ gas density-pressure monitoring device 10 through a test signal line;

The computer is also connected to an alarm driving device through a signal line.

Referring to Fig. 3 again, the verification method of SF of the present invention ₆ gas density-pressure monitoring device is implemented in the verification platform of above-mentioned SF ₆ gas density-pressure monitoring device, and the method may further comprise the steps:

Step 1, install the SF gas _density -pressure monitoring device 10 to be tested on the interface 3 of the calibration platform, and connect the computer through the test signal line;

Step 2, open the main on-off valve 82 of the gas circuit and the on-off valve 72 of the gas storage cylinder, and the touch screen 4 displays the initial interface of the test;

Step 3: According to the prompts on the interface of the touch screen 4, perform the following steps on the air circuit control system:

a. Vacuumizing the pipeline, only when the main engine is just turned on, first set the vacuum parameter, manually open the vacuum pump solenoid valve 62 and start the vacuum pump 6, and then vacuumize the first pipeline 60 and the air storage cylinder 7;

b. Supplement gas to the gas storage cylinder 7, adopt an external gas cylinder to replenish SF ₆ gas to the gas storage cylinder 7, the pressure of the inflated gas is not more than 1.3MPa, and the pressure of the inflated gas is sensed by the gas storage cylinder pressure sensor 71, so that the gas inflated The pressure is not greater than 1.3 MPa, and the solenoid valve 72 of the air storage cylinder is automatically closed after the inflation is completed, and the interface switch valve 65 is closed after the touch screen 4 jumps out of the reset window;

c. add air to the working cylinder 8, start the drive motor 9 so that the piston 83 of the working cylinder 8 is located at the middle part of the working cylinder 8, and now the air storage cylinder solenoid valve 73 is opened, and the air storage cylinder 7 is used to add gas to the working cylinder 8;

Step 4, collect and set calibration parameters according to the interface prompts on the touch screen 4:

a. Click the contact test button, first select the type of the SF ₆ gas density-pressure monitoring device 10 to be tested and whether it has a high pressure alarm, and then set the rated pressure value and contact setting value; after clicking the contact test button, the interface under test will appear The type selection of the device 10, there are two kinds of relative pressure gauge and absolute pressure gauge, after the selection, the interface shows the choice of whether to have a high pressure alarm, after the selection, a parameter setting box appears, in the parameter setting box, all data need to be set , if there is only one blocking test point, you need to fill in the other blocking box with the same value;

b. Collect the ambient temperature value through the temperature sensor 64 and input it to the computer; the ambient temperature sensed by the temperature sensor 64 is -10°C to 60°C;

c. Collect the pipeline pressure value through the pipeline pressure sensor 63 and input it to the computer, and the pipeline pressure is controlled by the computer to reach the range of the set value; the precision of the pipeline pressure sensor 63 is 0.25;

Step five, carry out contact performance detection under normal temperature to tested SF ₆ gas density-pressure monitoring device 10: first input each standard value of tested device 10 in the information input box on the interface and click OK, these standard values Including high-pressure alarm value, rated density value, low-pressure alarm value and blocking value, then the computer pressurizes the measured SF ₆ gas density-pressure monitoring device, after the pressure exceeds the rated density value or reaches the high-pressure alarm value, it returns to the deceleration When returning to the rated density value, visually observe the actual display value of the device under test 10 and input it into the information input box that appears on the interface, and then continue to return, when it returns to less than the blocking value of the device under test 10, pressurize again And repeat the above test, a total of three times, and finally conduct system analysis according to the recorded contact value;

Step 6, place the measured SF ₆ gas density-pressure monitoring device in a high and low temperature box for contact performance testing at high and low temperatures: first select the test temperature and input the rated pressure value and contact setting value, and then click the corresponding The high and low temperature detection button starts the same detection procedure as step 5; the temperature adjustment of the high and low temperature box is -30 ° C ~ 70 ° C;

Step 7, recovering the SF ₆ gas for detection, needs to be carried out after the entire detection is completed: the computer drives the motor 9 to move the piston 83 of the working cylinder 8, so that the gas in the pipeline returns to the working cylinder 8 and closes the gas circuit Main solenoid valve 81;

Step 8, print the report and judge whether the tested SF ₆ gas density-pressure monitoring device 10 is qualified.

The SF ₆ gas density-pressure monitoring device of the present invention is at the moment when the test process begins, the computer will detect the air pressure in the pipeline, if the air pressure of the pipeline is greater than any value that needs to be detected at that time, then First reset to a relatively low air pressure value, and then the air pressure rises and is detected. The speed of the drive motor 9 is determined according to the set value. The closer to the set value, the slower the speed. When the rated value is reached, the air circuit The total electromagnetic valve 81 is closed, and the speed of the driving motor 9 is zero.

After testing multiple meters, the gas in the working cylinder 8 will become very thin, and then there will be insufficient gas, that is, when the compressed gas of the piston 83 of the working cylinder 8 reaches the left limit, it still cannot reach the rated pressure value or High pressure alarm value, at this time, the information bar of "the air pressure of the working cylinder is not enough, the gas supply starts..." appears, and at the same time, the driving motor 9 is controlled to pull the piston 83 to run to the right, stop when it reaches the middle of the working cylinder 8, and automatically open the storage cylinder Solenoid valve 73 pressurizes working cylinder 8, and detects inflation pressure by gas storage cylinder pressure sensor 71 simultaneously, closes gas storage cylinder solenoid valve 73 automatically after reaching required gas pressure, and test work continues. When the gas pressure in the gas storage cylinder 7 is less than 0.3MPa, the system will prompt to replenish the gas storage cylinder 7.

The frequency converter 90 can adjust the operating frequency of the drive motor 9: the coarse adjustment makes the piston 83 move to the left and the right, and the drive motor 9 moves at a frequency of 30 Hz; the fine adjustment makes the piston 83 move to the left and right, and the drive motor 9 is Movement at a frequency of 5 Hz, this function can open the air storage cylinder solenoid valve 73 from the air storage cylinder 7 to the working cylinder 8 to pressurize the working cylinder 8 when the required air pressure is not reached after the working cylinder 8 is automatically inflated. When the pressure in the working cylinder 8 is too high, the drive motor 9 can be adjusted from coarse to fine, so that the pressure in the working cylinder 8 reaches the required suitable pressure.

The calibration platform of the SF ₆ gas density-pressure monitoring device of the present invention adopts microcomputer technology and a fully enclosed SF ₆ gas circulation system, selects high-performance pressure sensors and temperature sensors, and solves the problem of SF ₆ gas density-pressure monitoring in the current laboratory The device requires high calibration accuracy and the difficulty of fully enclosed SF ₆ gas circulation. The comprehensive calibration equipment samples the gas pressure and temperature of the measured SF ₆ gas density-pressure monitoring device at the same time, and automatically converts it into the standard pressure value at 20°C, thus completing the dynamic automatic compensation of pressure and temperature, making up for the On-site can only calibrate the disadvantages of normal temperature density relays, so this comprehensive calibration equipment does not need to work in a constant temperature room used in traditional calibration methods, and avoids a large amount of waste of SF ₆ gas.

The above embodiments are only for the purpose of illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can also make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent The technical solutions should also belong to the category of the present invention and should be defined by each claim.

Claims (9)

1. SF ₆The checking table of gas density and pressure monitoring device comprises that the operation cabinet, that a high-low temperature chamber, an operator's console, are connected the operator's console rear end is located at operation main frame cashier's office in a shop, and this main frame comprises some tested SF that are connected in parallel ₆The interface of gas density and pressure monitoring device, one and tested SF ₆Air-path control system, a computing machine, a touching display screen that links to each other with computing machine and a printer that the interface of gas density and pressure monitoring device links to each other is characterized in that,

Described air-path control system comprises a vacuum pump, an air reservoir, a working cylinder and a drive motor, wherein,

Described vacuum pump links to each other the delivery outlet of interface switch valve and tested SF with the input port of barometric pressure sensor, vacuum pump solenoid valve, line-pressure sensor, temperature sensor and interface switch valve successively by first pipeline ₆The interface of gas density and pressure monitoring device connects;

Described air reservoir links to each other with the input port of air reservoir pressure transducer, air reservoir switch valve and air reservoir solenoid valve successively by second pipeline, and the delivery outlet of air reservoir solenoid valve links to each other with working cylinder;

Described working cylinder links to each other with the input port of total solenoid valve of gas circuit and gas circuit master switch valve successively by the 3rd pipeline, the delivery outlet of gas circuit master switch valve and first pipeline connection and between temperature sensor and line-pressure sensor;

The output shaft of described drive motor is connected with the piston of working cylinder;

Described vacuum pump solenoid valve, air reservoir solenoid valve, the total solenoid valve of gas circuit, drive motor, barometric pressure sensor, line-pressure sensor, air reservoir pressure transducer and temperature sensor are connected with computing machine by the test signal line respectively;

Described computing machine and tested SF ₆Link to each other by the test signal line between the gas density and pressure monitoring device.

2. SF according to claim 1 ₆The checking table of gas density and pressure monitoring device is characterized in that, also connects a frequency converter on the described drive motor, and this frequency converter is connected with computing machine by the test signal line.

3. SF according to claim 1 ₆The checking table of gas density and pressure monitoring device is characterized in that, described computing machine also connects a warning drive unit by signal wire.

4. according to described any one SF of claim 1 to 3 ₆The checking table of gas density and pressure monitoring device is characterized in that,

Described touching display screen is arranged on the front panel of operation cabinet, also is provided with power light, power switch, alarm lamp and alarm buzzer on this panel;

Described tested SF ₆The interface of gas density and pressure monitoring device and interface switch valve are arranged in the window of offering on the side panel of operation cabinet;

Described air reservoir switch valve and gas circuit master switch valve are arranged in another window of offering on the side panel of operation cabinet;

In the window that described printer setup is offered on the another side panel of operation cabinet.

5. SF ₆The method of calibration of gas density and pressure monitoring device is executed in the described SF of claim 1 ₆The checking table of gas density and pressure monitoring device is characterized in that, this method comprises the following steps:

Step 1 is with SF to be measured ₆Gas density and pressure monitoring device is installed on the interface of checking table, and connects computing machine by the test signal line;

Step 2 is opened gas circuit master switch valve and air reservoir switch valve, and touching display screen shows the initial interface of test;

Step 3, according to the interface prompt of touching display screen air-path control system is carried out:

A. pipeline vacuumizes, and only carries out when main frame is just opened, and the vacuum tightness parameter is set earlier, and manually opened vacuum pump solenoid valve and startup vacuum pump vacuumize first pipeline and air reservoir then;

B. give the air reservoir tonifying Qi, adopt external gas cylinder that air reservoir is replenished SF ₆Gas, the pressure of the body of inflating is not more than 1.3MPa, and inflation finishes back air reservoir solenoid valve and closes down interface switch valve after touching display screen is jumped out the window that resets automatically;

C. give the working cylinder aerating, start drive motor so that the piston of working cylinder is positioned at the middle part of working cylinder, this moment, the air reservoir solenoid valve was opened, and gave the working cylinder aerating by air reservoir;

Step 4, according to the interface prompt collection of touching display screen with checking parameter is set:

A. click the contact testing button, select tested SF earlier ₆The type of gas density and pressure monitoring device reaches whether be with alarm for high voltage, sets rated pressure value and contact setting value then;

B. gather ambient temperature value and be input to computing machine by temperature sensor;

C. gather the pipeline force value and be input to computing machine by line-pressure sensor, reach by the computer control line pressure in the scope of setting value;

Step 5 is to tested SF ₆Gas density and pressure monitoring device carries out the contact Performance Detection under the normal temperature;

Step 6 is with tested SF ₆Gas density and pressure monitoring device is placed on the contact Performance Detection when high-low temperature chamber is interior to carry out high low temperature to it;

Step 7 reclaims to detect and uses SF ₆Gas;

Step 8, printing reports is also judged tested SF ₆Whether gas density and pressure monitoring device is qualified.

6. SF according to claim 5 ₆The method of calibration of gas density and pressure monitoring device is characterized in that, when carrying out described step 5: earlier every standard value of tested device is input in the information input frame on the interface and clicks and determine, then computing machine is to tested SF ₆The gas density and pressure monitoring device pressurization, after being pressurized to above nominal density value or arrival alarm for high voltage value, then return decompression, when turning back to the nominal density value, the actual indicated value of range estimation tested device also is input to the information input frame that occurs on the interface, continues then to return, when the locking value that turns back to less than tested device, pressurize and repeat above-mentioned test, triplicate carries out systematic analysis according to the contact value that is write down at last altogether.

7. SF according to claim 5 ₆The method of calibration of gas density and pressure monitoring device, it is characterized in that, when the described step 6 of execution: select probe temperature and input rated pressure value and contact setting value earlier, click the trace routine of corresponding high low temperature test button startup then with step 5; The adjusting temperature of described high-low temperature chamber is-30 ℃～70 ℃.

8. SF according to claim 5 ₆The method of calibration of gas density and pressure monitoring device, it is characterized in that, need carry out after whole detection is finished when carrying out described step 7: the piston by the computer control working cylinder moves, and makes gas backstreaming in the pipeline interior and close the total solenoid valve of gas circuit to working cylinder.

9. SF according to claim 5 ₆The method of calibration of gas density and pressure monitoring device is characterized in that, the environment temperature of described temperature sensor senses is-10 ℃～60 ℃; The precision of described line-pressure sensor is 0.25 grade.

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