CN201297986Y

CN201297986Y - Calibration stand of SF* gas density-pressure monitoring device

Info

Publication number: CN201297986Y
Application number: CNU2008201535437U
Authority: CN
Inventors: 于锡勇
Original assignee: Shanghai Electric Power Equipment Installation Co Ltd
Current assignee: Shanghai Electric Power Equipment Installation Co Ltd
Priority date: 2008-09-26
Filing date: 2008-09-26
Publication date: 2009-08-26
Anticipated expiration: 2018-09-26

Abstract

The utility model discloses a time-saving labor-saving accurate and efficient calibration stand of an SF6 gas density-pressure monitoring device, which comprises a high temperature box, a low temperature box, an operating table, an operating cabinet connected at the rear end of the operating table, and a main machine arranged on the operating cabinet, wherein, the main machine comprises a plurality of interfaces of the SF6 gas density-pressure monitoring device to be calibrated, a gas circuit control system connected with the interfaces of the SF6 gas density-pressure monitoring device to be calibrated, a computer and a touch display screen and a printer connected with the computer; the interfaces of the SF6 gas density-pressure monitoring device to be tested are connected in parallel; and the gas circuit control system comprises a vacuum pump, a gas reservoir, a working cylinder and a drive motor. The device can carry out calibration controlled by the computer and has high degree of automation of test operation; the working cylinder provided with a smart pressure sensor is operated by a motor controlled by a microcomputer, instead of manual operation, thereby saving time and labor and resulting in accuracy and high efficiency.

Description

SF 6The checking table of gas density and pressure monitoring device

Technical field

The utility model relates to a kind of overall calibration equipment of electrical installation, particularly a kind of SF ₆The checking table of gas density and pressure monitoring device.

Background technology

SF ₆Gas density and pressure monitoring device (SF ₆Density monitor) has been widely used in the electrical engineerings such as high voltage power distribution switch, high-tension distribution equipment, high-power transformer, promoted the fast development of power industry.SF ₆Gas density and pressure monitoring device is one of key element of electric switch, and it is used for monitoring SF ₆SF in the electrical equipment body ₆The variation of gas density, its performance encircle well and directly have influence on SF ₆The safe and reliable operation of electrical equipment.Be installed on on-the-spot SF ₆Gas density and pressure monitoring device is because of often action, the normal phenomenon that dumb or poor contact of contacts occur moving through back after a while, and what have also the temperature compensation degradation can occur, causes SF when variation of ambient temperature easily ₆The gas density and pressure monitoring device misoperation, so power department has been stipulated experiment rules: each SF ₆The electric switch applying unit must be regularly to SF ₆Gas density and pressure monitoring device carries out verification.

Present domestic SF ₆The tester of density-pressure monitoring device is the portable tester that can take field test to, and there is following shortcoming in this tester:

1. also relatively backward aspect method of testing and measuring accuracy.

2. once inflate the problem of interface and secondary connection interface dismounting difficulty, change if any density monitor in batch, the unusual difficulty of verification at the scene can only be placed on verification on the overall calibration platform in the laboratory of constant temperature to the density monitor that changes.

3. the force value under the verification environment temperature at the scene, equivalent pressure value when then the force value under this temperature being converted to 20 ℃, relative pressure value during again with 20 ℃ is judged the performance of density monitor as standard value, thereby can not verification goes out the temperature compensation performance of density monitor.

4. can not reclaim the SF of test usefulness ₆Gas.

Summary of the invention

The purpose of this utility model is in order to overcome the deficiencies in the prior art, and a kind of SF of time saving and energy saving, precise and high efficiency is provided ₆The checking table of gas density and pressure monitoring device, the precision height of this device verification, the SF that verification test is used ₆Gas is recyclable.

Realize that the utility model purpose technical scheme is: a kind of 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, 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.

Above-mentioned SF ₆The checking table of gas density and pressure monitoring device wherein, also connects a frequency converter on the described drive motor, this frequency converter is connected with computing machine by the test signal line.

Above-mentioned SF ₆The checking table of gas density and pressure monitoring device, wherein, described computing machine also connects a warning drive unit by signal wire.

Any one above-mentioned SF ₆The checking table of gas density and pressure monitoring device, wherein,

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.

SF of the present utility model ₆The technical scheme of the checking table of gas density and pressure monitoring device has following advantage:

1. increasingly automated by computer-controlled calibrating and test operation;

2. the working cylinder that has the intelligent pressure sensor monitoring replaces manual operation by the system controlled by computer motor, and is time saving and energy saving, precise and high efficiency;

3. integrate vacuumize, inflation and tonifying Qi, machine control is to SF as calculated ₆Gas density and pressure monitoring device is realized intelligent automatic inflation, so that carry out high low temperature temperature compensation test;

4. with the computer display of being furnished with touch-screen, convenient, fast and directly perceived;

5. can examine and determine the SF that detects same model simultaneously in batches ₆2～4 of gas density and pressure monitoring devices;

6. by record queries, analytic statistics, the report output of computer realization to historical data; By the configuration software programming, realize vivid, lively, directly perceived, friendly operation control interface;

7. the SF that verification test is used in the operator's console ₆Gas is recyclable;

8. have sound, the light warning function that freely to select.

Description of drawings

Fig. 1 is SF of the present utility model ₆The structural representation of the checking table of gas density and pressure monitoring device;

Fig. 2 is SF of the present utility model ₆The synoptic diagram of the air-path control system of the checking table of gas density and pressure monitoring device;

Fig. 3 is SF of the present utility model ₆The illustrative view of functional configuration of the checking table of gas density and pressure monitoring device.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing and instantiation.

See also Fig. 1, SF of the present utility model ₆The checking table of gas density and pressure monitoring device comprises that operation cabinet 2, that a high-low temperature chamber (not shown), an operator's console 1, are connected operator's console 1 rear end is located at the main frame on the operation cabinet 2, and this main frame comprises some tested SF that are connected in parallel ₆The interface 3 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 4 and printer 5 that the interface 3 of gas density and pressure monitoring device 10 links to each other; Touching display screen 4 is arranged on the front panel 20 of operation cabinet 2, also is provided with power light 201, power switch 202, alarm lamp 203 and alarm buzzer 204 on this panel 20; Printer 5 is arranged in the window of offering on the right flank panel 21 of operation cabinet 2.

See also Fig. 2 again, air-path control system comprises a vacuum pump 6, an air reservoir 7, a working cylinder 8 and a drive motor 9, wherein,

Vacuum pump 6 links to each other the delivery outlet of interface switch valve 65 and tested SF with the input port of barometric pressure sensor 61, vacuum pump solenoid valve 62, line-pressure sensor 63, temperature sensor 64 and interface switch valve 65 successively by first pipeline 60 ₆The interface 3 of gas density and pressure monitoring device 10 connects; Tested SF ₆The interface 3 of gas density and pressure monitoring device 10 and interface switch valve 65 are arranged in the window of offering on the Left-Hand Panel 22 of operation cabinet 2;

Barometric pressure sensor 61 induced environment pressure are used to adjust tested SF ₆The initial value of gas density and pressure monitoring device; Temperature sensor 64 is gathered ambient temperature value and also is input to computing machine, and the force value the when force value that is used for recording under current environment temperature is converted to 20 ℃ of normal temperature is compared by the normal pressure value of computing machine to 20 ℃ of this force value and normal temperature; Line-pressure sensor 63 induction pipeline force value also are input to computing machine, are used for current line pressure is contrasted tested SF ₆The pressure that the gas density and pressure monitoring device pointer is shown, thus the effect of verification obtained; The precision of this line-pressure sensor 63 is greater than tested SF ₆The precision of gas density and pressure monitoring device, the precision of the line-pressure sensor 63 in the checking table of the present invention is 0.25 grade, well beyond general precision be 1.5 grades tested SF ₆Gas density and pressure monitoring device is so the quality of verification reaches precise and high efficiency;

Air reservoir 7 links to each other with the input port of air reservoir pressure transducer 71, air reservoir switch valve 72 and air reservoir solenoid valve 73 successively by second pipeline 70, and the delivery outlet of air reservoir solenoid valve 73 links to each other with working cylinder 8; The force value of air reservoir pressure transducer 71 induction air reservoirs 7 also is input to computing machine, is used to control the pressure of air reservoir 7;

Working cylinder 8 links to each other with the input port of total solenoid valve 81 of gas circuit and gas circuit master switch valve 82 successively by the 3rd pipeline 80, and the delivery outlet of gas circuit master switch valve 82 is communicated with first pipeline 60 and between temperature sensor 64 and line-pressure sensor 63;

Air reservoir switch valve 72 and gas circuit master switch valve 82 are arranged in another window of offering on the side panel 22 of operation cabinet 2;

The output shaft of drive motor 9 is connected with the piston 83 of working cylinder 8, by the move left and right of drive motor 9 control pistons 83; Also connect a frequency converter 90 on the drive motor 9, this frequency converter 90 is connected with computing machine by the test signal line.

Vacuum pump solenoid valve 62, air reservoir solenoid valve 73, the total solenoid valve 81 of gas circuit, drive motor 9, barometric pressure sensor 61, line-pressure sensor 63, air reservoir pressure transducer 71 and temperature sensor 64 are connected with computing machine by the test signal line respectively;

Computing machine and tested SF ₆Link to each other by the test signal line between the gas density and pressure monitoring device 10;

Computing machine also connects a warning drive unit by signal wire.

See also Fig. 3 again, SF of the present utility model ₆The checking table verification SF of gas density and pressure monitoring device ₆The method of gas density and pressure monitoring device comprises the following steps:

Step 1 is with SF to be measured ₆Gas density and pressure monitoring device 10 is installed on the interface 3 of checking table, and connects computing machine by the test signal line;

Step 2 is opened gas circuit master switch valve 82 and air reservoir switch valve 72, and touching display screen 4 shows the initial interface of test;

Step 3, according to the interface prompt of touching display screen 4 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 62 and startup vacuum pump 6 vacuumize first pipeline 60 and air reservoir 7 then;

B. give air reservoir 7 tonifying Qi, adopt external gas cylinder that air reservoir 7 is replenished SF ₆Gas, the pressure of the body of inflating is not more than 1.3MPa, pressure by the air reservoir pressure transducer 71 induction bodies of inflating, make the pressure of the body of inflating be not more than 1.3MPa, inflation finishes back air reservoir solenoid valve 72 and closes down interface switch valve 65 after touching display screen 4 is jumped out the window that resets automatically;

C. give working cylinder 8 aeratings, start drive motor 9 so that the piston 83 of working cylinder 8 is positioned at the middle part of working cylinder 8, this moment, 73 unlatchings of air reservoir solenoid valve were given working cylinder 8 aeratings by air reservoir 7;

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

A. click the contact testing button, select tested SF earlier ₆The type of gas density and pressure monitoring device 10 reaches whether be with alarm for high voltage, sets rated pressure value and contact setting value then; After clicking the contact testing button, the type selecting of tested device 10 appears in the interface, two kinds of relative pressure table and absolute pressure gauges are arranged, whether the selection with alarm for high voltage appears in the interface after selecting, the parameter setting frame occurs after selecting, in the parameter setting frame, all data all need to set, if have only a locking test point, then need another locking frame is filled out identical value;

B. gather ambient temperature value and be input to computing machine by temperature sensor 64; The environment temperature of temperature sensor 64 inductions is-10 ℃～60 ℃;

C. gather the pipeline force value and be input to computing machine by line-pressure sensor 63, reach by the computer control line pressure in the scope of setting value; The precision of line-pressure sensor 63 is 0.25 grade;

Step 5 is to tested SF ₆Gas density and pressure monitoring device 10 carries out the contact Performance Detection under the normal temperature: earlier every standard value of tested device 10 is input in the information input frame on the interface and clicks and determine, these standard values comprise alarm for high voltage value, nominal density value, low pressure alarming value and locking value, and 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 displayed value of range estimation tested device 10 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 10, pressurize and repeat above-mentioned test, triplicate carries out systematic analysis according to the contact value that is write down at last altogether;

Step 6 is with tested SF ₆Gas density and pressure monitoring device is placed 10 contact Performance Detection when in high-low temperature chamber it being carried out high low temperature: select probe temperature and input rated pressure value and contact setting value earlier, click corresponding high low temperature test button then and start trace routine with step 5; The adjusting temperature of high-low temperature chamber is-30 ℃～70 ℃;

Step 7 reclaims to detect and uses SF ₆Gas needs to carry out after whole detection is finished: by computer control drive motor 9 piston 83 of working cylinder 8 is moved, so that the gas backstreaming in the pipeline is interior and close the total solenoid valve 81 of gas circuit to working cylinder 8;

Step 8, printing reports is also judged tested SF ₆Whether gas density and pressure monitoring device 10 is qualified.

SF of the present utility model ₆The checking table of gas density and pressure monitoring device is in test process moment at the beginning, computing machine can be done a detection to the air pressure in the pipeline, if the air pressure of pipeline then reset to a lower atmospheric pressure value earlier greater than any one value that needs detect at that time, and then pressure rises and detection, it is fixed that the speed of drive motor 9 is come according to desired level, near setting value, then speed is slow more more, when ratings arrives, the total solenoid valve 81 of gas circuit cuts out, and the speed of drive motor 9 is zero.

Behind a plurality of tables of test, gas in the working cylinder 8 can become very thin, the situation that the gas deficiency at this moment will occur, promptly when arriving limit on the left, piston 83 pressure gass of working cylinder 8 still can not reach rated pressure value or alarm for high voltage value, the information bar that " working cylinder air pressure is not enough; tonifying Qi begins ... " appears in this moment, controlling and driving motor 9 pulling pistons 83 move to the right simultaneously, stop when arriving working cylinder 8 middle parts, and open air reservoir solenoid valve 73 automatically, give working cylinder 8 pressurizations, detect charge pressure by air reservoir pressure transducer 71 simultaneously, automatically close air reservoir solenoid valve 73 after arriving the gaseous tension that needs, test job is proceeded.When the gaseous tension in the air reservoir 7 during less than 0.3MPa, system can be prompted to air reservoir 7 tonifying Qi.

The frequency of operation of the scalable drive motor 9 of frequency converter 90: coarse adjustment is turned left piston 83, turn right, drive motor 9 is the frequency movements with 30 hertz, fine tuning is turned left piston 83, turn right, drive motor 9 is the frequency movements with 5 hertz, this function can still not reach under the required barometric information after the inflation at working cylinder 8 automatically, open from air reservoir 7 to working cylinder 8 air reservoir solenoid valve 73, give working cylinder 8 pressurizations, when working cylinder 8 internal pressures are too high, can carry out drive motor 9 is carried out from the coarse adjustment to the fine tuning, so that the pressure in the working cylinder 8 reaches required convenient pressure.

SF of the present utility model ₆The checking table of gas density and pressure monitoring device adopts microcomputer technology and totally-enclosed SF ₆Gas-circulating system is selected high-performance pressure sensor and temperature sensor for use, has solved present laboratory to SF ₆The gas density and pressure monitoring device checking precision requires high, totally-enclosed SF ₆The problem of gas circulation difficulty.This overall calibration equipment tested SF that samples simultaneously ₆Gaseous tension and temperature during the gas density and pressure monitoring device action, and the normal pressure value when being converted into 20 ℃ automatically, thereby finished the dynamic auto compensation of pressure, temperature, remedied on-the-spot drawback that can only verification normal temperature density monitor, therefore this overall calibration equipment need not the used constant temperature office work of traditional method of calibration, and has avoided a large amount of SF ₆The waste of gas.

Above embodiment is only for the usefulness that the utility model is described, but not to restriction of the present utility model, person skilled in the relevant technique, under the situation that does not break away from spirit and scope of the present utility model, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.

Claims

1, a kind of 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.