CN101206169B - Tester for SF6 gas density relay - Google Patents
Tester for SF6 gas density relay Download PDFInfo
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- CN101206169B CN101206169B CN2006101477634A CN200610147763A CN101206169B CN 101206169 B CN101206169 B CN 101206169B CN 2006101477634 A CN2006101477634 A CN 2006101477634A CN 200610147763 A CN200610147763 A CN 200610147763A CN 101206169 B CN101206169 B CN 101206169B
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Abstract
An SF6 gas density relay check meter comprises a gas source supplier, a pressure transducer, a temperature transducer and a computer data processing system, wherein the gas source supplier capable of adjusting pressure comprises a pressure adjusting cylinder, a piston, an adjusting bar and a hand wheel, the hand wheel drives the adjusting bar which consequently drives the piston to move in the pressure adjusting cylinder, thereby realizing gas source pressure adjustment in the pressure adjusting cylinder; according to the type of the relay to be tested, the type of the transducer used for measurement, the temperature value during measurement and the pressure-temperature characteristic relation of the SF6 gas, the computer data processing system carries out data processing and obtains a corresponding pressure value at 20 DEG C, and thus the accurate test on the performance of the SF6 gas density relay is completed. The SF6 gas density relay check meter provided by the invention can calibrate SF6 gas density relays of various measurement philosophies under various circumstances without being affected by located atmosphere pressure.
Description
Technical field
The present invention relates to a kind of calibration equipment of electrical equipment instrument, particularly a kind ofly be used for checking SF
6The SF of gas density relay
6Gas density relay checking instrument.
Background technology
SF
6Electric product has been widely used in power department, industrial and mining enterprises, has promoted the fast development of power industry.How to guarantee SF
6The reliable and secure operation of electric product has become one of vital task of power department.SF
6Gas density relay is SF
6One of key element of electric switch, it is used for detecting SF
6SF in the electrical equipment body
6The variation of gas density, its performance quality directly has influence on SF
6The reliable and secure operation of electrical equipment.Be installed on on-the-spot SF
6Gas density relay is because of often action, and the phenomenon of dumb or poor contact of contacts often appears moving in after date during through one section, and what have also the temperature compensation degradation can occur, causes SF when variation of ambient temperature easily
6The gas density relay misoperation.Therefore should be regularly to SF
6Gas density relay carries out verification.From practical operation situation, to the SF at scene
6It is to prevent trouble before it happens that gas density relay carries out periodic check, ensures one of necessary means of power equipment safety reliability service.In airtight container, the SF under the uniform temperature
6Gaseous tension can be represented SF
6Gas density.In order to unify SF during traditionally often 20 ℃
6The pressure of gas is as the typical value of its corresponding density.So, SF
6Gas density relay SF during all with 20 ℃
6The pressure of gas is as nominal value.SF
6The density value measuring method of gas density relay has following two kinds:
1, undertaken by measuring absolute pressure value, the general relative chamber compensation principle that adopts of this method is realized temperature compensation, and it is not subjected to sea level elevation, promptly is not subjected to local atmospheric the influence.If SF on the switch
6Do not reveal, if the temperature compensation precision of density monitor is very high, the force value that it shows is not changed by the variation of height above sea level, weather, and promptly its displayed value is constant, same actual act value also not with local, not with changing season, promptly be constant.
2, undertaken by measuring the relative pressure value, this method generally adopts the temperature compensation sheet to realize temperature compensation, and its housing communicates with atmosphere, and it is subjected to height above sea level, promptly be subjected to the locality atmospheric influence very big.Even SF on the switch
6Do not reveal, even the temperature compensation precision of density monitor is very high, its shown force value still can be subjected to the variation of sea level elevation and weather and change, and promptly its displayed value changed with local, season, the actual act value also with local, with changing season.
In addition, also having a kind of method also is to be undertaken by measuring absolute pressure value, and this method generally also adopts the temperature compensation sheet to realize temperature compensation, but its whole housing seal, do not communicate,, promptly be not subjected to local atmospheric the influence so be not subjected to sea level elevation with atmosphere.If SF on the switch
6Do not reveal, if the temperature compensation precision of density monitor is very high, its shown force value just can not be subjected to sea level elevation, promptly can not be subjected to the variation of weather and changes, and promptly its displayed value is with changing in local, season, and is promptly constant.The actual act value is also with changing in local, season, and is promptly constant, so its reflection in fact also is absolute pressure value, and promptly in fact this measuring method is also undertaken and realized by measuring absolute pressure value.
In sum, the SF that uses at present
6In fact the measuring method of gas density relay has two kinds, in other words SF
6The type of gas density relay has two kinds: a kind of using by measuring absolute pressure value carried out work, can abbreviate " absolute pressure relay " as; Another kind carries out work by measuring the relative pressure value, can abbreviate " relative pressure relay " as.And present employed SF
6Gas density relay checking instrument all adopts the method for measuring the relative pressure value to carry out verification, and this is to the SF with measurement absolute pressure value method
6Gas density relay (absolute pressure relay) is inaccurate, and major defect is arranged.Particularly,, can produce very big error in extra high season of air pressure or low especially season in the high altitude localities.In addition at the scene during verification, under different environment temperatures, the normal pressure value the when force value that measures all will be converted into its corresponding 20 ℃, thus judge this SF
6The performance of gas density relay.
Present SF
6The method of calibration of gas density relay mainly contains following several on the engineering:
1, utilizes SF
6The equipment gas replenishment process carries out verification to density monitor.This method is mainly used in the scene, but has following problem: (1) temperature effect is big, is difficult to guarantee accuracy; (2) utilize SF
6Table meter on the gas cylinder (relative pressure table) reading, degree of accuracy is very poor, can not guarantee accuracy, to the density monitor (absolute pressure relay) of measuring the absolute pressure value method, just may directly produce bigger error in the area of height above sea level in addition; 3) SF
6Density monitor is applied to the step-down process, and comes verification with gas replenishment process, does not conform to practical situations, also influences the verification accuracy.
2, utilize SF
6The equipment deflation course is to the density monitor verification.Exist in this way with method 1 in (1), (2) same problem, and will be during venting to SF
6Gas recovery needs with special SF
6Gas concentration unit, very inconvenient.
3, in the constant temperature enclosure verification.This method of calibration is carried out in isoperibol, eliminated the error that temperature is brought verification, so the accuracy of verification is higher.But checking time is long in this way, need set up special constant temperature laboratory, and will set up the full-time worker, has increased on-the-spot work difficulty, and is both uneconomical also inconvenient.In fact, be unpractical at the scene.Equally, to the density monitor (absolute pressure relay) of measuring the absolute pressure value method, just may directly produce bigger error in the area of height above sea level.
The SF of present employed various models
6Gas density relay checking instrument, though the pressure and temperature value when all adopting the test density actuating of relay basically, then according to SF
6The pressure-temperature characteristic relation of gas, the force value when utilizing computing machine to be converted into 20 ℃ automatically promptly can be carried out automatic dynamic temp compensation.But these testers, all exist same defective or mistake: to the density monitor (absolute pressure relay) that carries out with measurement absolute pressure value method, area at height above sea level just may directly produce bigger error, in high season of a lot of local air pressure or low season, also may produce bigger error, have a strong impact on test accuracy.Because these SF at present
6Gas density relay checking instrument all is to adopt the method for measuring the relative pressure value to carry out.When test was actually the density monitor that carries out with measurement absolute pressure value method, if accurately, just must manually revise its test value, this was to bother very much with inconvenient.
In sum, there are not a kind of tester and method of calibration can both test the SF of various measuring principles accurately in various occasions
6Gas density relay (being absolute pressure relay and relative pressure relay).
Innovation and creation go out a kind of tester and its method of calibration can both be tested the SF of various measuring principles accurately in various occasions so be starved of now
6Gas density relay.
Summary of the invention
Purpose of the present invention is to overcome the deficiency that above-mentioned prior art exists, provide a kind of can be at the various occasions SF of the various measuring principles of verification accurately
6The SF of gas density relay
6Gas density relay checking instrument.
The object of the present invention is achieved like this: a kind of SF
6Gas density relay checking instrument comprises that a source of the gas provides mechanism, at least one pressure transducer, a temperature sensor, a computer data processing system, an operation keyboard and a display screen, is characterized in:
Described source of the gas provides mechanism to provide mechanism for the source of the gas of adjustable in pressure;
Described computer data processing system is absolute pressure relay or relative pressure relay, measuring sensor temperature value and the SF when being absolute pressure transducer or relative pressure sensor, test according to the relay of being tested
6The pressure-temperature characteristic relation of gas carries out data processing, obtains corresponding 20 ℃ of force value, realizes SF
6The accurate test of gas density relay performance.
The data processing content of described computer data processing system comprises:
1), when measuring the absolute pressure relay with absolute pressure transducer, direct temperature value and the SF during according to test with the absolute pressure value that records
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of absolute pressure value;
2), when measuring the relative pressure relay with relative pressure sensor, direct temperature value and the SF during according to test with the relative pressure value that records
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of relative pressure values;
3), when measuring the relative pressure relay with absolute pressure transducer, earlier the absolute pressure value that records is converted into the relative pressure value, its conversion relation formula is: P
The relative pressure of test=P
The absolute pressure of test-P
Local air pressure, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of relative pressure values;
4), when measuring the absolute pressure relay with relative pressure sensor, earlier the relative pressure value that records is converted into absolute pressure value, its conversion relation formula is: P
The absolute pressure of test=P
The relative pressure of test+ P
Local air pressure, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of absolute pressure value.
The data processing content of described computer data processing system also comprises:
5), when measuring the relative pressure relay with absolute pressure transducer, temperature value and the SF during according to test with the absolute pressure value that records earlier
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of absolute pressure value, is converted into corresponding 20 ℃ of relative pressure values then, and its conversion relation formula is: P
The relative pressure of 20 tests Power=P
The absolute pressure of 20 tests-P
Local air pressure
6), when measuring the absolute pressure relay with relative pressure sensor, temperature value and the SF during according to test with the relative pressure value that records earlier
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of relative pressure values, is converted into corresponding 20 ℃ of absolute pressure value then, and its conversion relation formula is: P
The absolute pressure of 20 tests Power=P
The relative pressure of 20 tests+ P
Local air pressure
When described absolute pressure relay was represented with absolute pressure value, its test result was corresponding 20 ℃ of absolute pressure value, and when representing with the relative pressure value, its test result is converted into corresponding 20 ℃ of relative pressure values; When described relative pressure relay was represented with the relative pressure value, its test result was corresponding 20 ℃ of relative pressure values, and when representing with absolute pressure value, its test result is converted into corresponding 20 ℃ of absolute pressure value; Conversion relation between absolute pressure value and the relative pressure value is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Described operation keyboard and display screen join together.
The source of the gas of described adjustable in pressure provides mechanism to comprise a pressure regulating cylinder that is used to provide source of the gas, piston is housed in the pressure regulating cylinder, piston is connected with an adjuster bar, handwheel is equipped with in the adjuster bar outer end, handwheel drives adjuster bar and then the drive piston moves in pressure regulating cylinder by rotating, and realizes the adjusting to bleed pressure in the pressure regulating cylinder.
SF of the present invention
6Gas density relay checking instrument can be at the various occasions SF of the various measuring principles of verification accurately
6Gas density relay, and be not subjected to local atmospheric the influence.
Description of drawings
Fig. 1 is SF of the present invention
6The structured flowchart of gas density relay checking instrument;
Fig. 2 is the structural representation that the source of the gas in the tester of the present invention provides mechanism.
Embodiment
Below by embodiment to SF of the present invention
6Gas density relay checking instrument is further described.Referring to Fig. 1, tester of the present invention comprises that the source of the gas of an adjustable in pressure provides mechanism 15, at least one pressure transducer 16, temperature sensor 17, computer data processing system 18, operation keyboard 20 and a display screen 19, and computer data processing system is provided with the relay action signal input port.
Referring to Fig. 2, Fig. 2 is SF of the present invention
6Source of the gas in the gas density relay checking instrument provides the structural representation of mechanism 15.It mainly comprises piston 1, wireway 21,22,23, valve 3, casing 4, air reservoir 5, pressure transducer 6, four-way seat 7, reverse checkvalve 8, O RunddichtringO 91,92, adjuster bar 10, handwheel 11, installing plate 12, pressure regulating cylinder 13.Air reservoir 5 is connected with an end of wireway 22, communicates on gas circuit; The other end of wireway 22 is connected with an end of valve 3; The other end of valve 3 is connected with an end of wireway 21; The other end of wireway 21 is connected with an interface of four-way seat 7; Another interface of four-way seat 7 is connected with an end of wireway 23 again; Pressure transducer 6 is fixed on the 3rd interface of four-way seat 7; Reverse checkvalve 8 is fixed on the 4th interface of four-way seat 7.The other end of wireway 23 is connected with pressure regulating cylinder 13; Piston 1 is arranged in the pressure regulating cylinder, and O- ring seal 91,92 is set in the groove of piston 1, and major function is that piston 1 seals when pressure is regulated in pressure regulating cylinder 13 motions; Piston 1 is movably connected with adjuster bar 10 again and connects; Adjuster bar 10 is connected again on the end cap of pressure regulating cylinder 13, can free activity regulate pressure; Handwheel 11 is movably connected with adjuster bar 10 and connects, and handwheel 11 can be movable, during use and adjuster bar 10 combine, the time spent can be not for convenience detach.Installing plate 12 is fixed on air reservoir 5 and the pressure regulating cylinder 13, and valve 3 and four-way seat 7 are fixed on the installing plate 12; Above element is installed in again in the casing 4.By the air reservoir of favorable sealing property, pressure regulating cylinder, valve, piston (studding with O-ring seal), wireway, pressure transducer, reverse checkvalve, adjuster bar, handwheel etc. have just been set up totally enclosed SF
6Gas-circulating system can make things convenient for, and is trickle, slowly, repetition, light adjusting pressure makes and does not waste SF in the checking procedure
6Gas.
When using at the scene, SF
6Gas connects an end and the SF of tracheae
6SF on the electrical equipment
6Gas density relay verification mouth is connected SF
6The other end that gas connects tracheae provides the reverse checkvalve 8 in the mechanism 15 to be connected with source of the gas, after connecting, observes force value, if pressure is not enough, illustrates that gas is not enough, just opens valve, the gas of air reservoir is released, till gas is enough tested.Valve-off just can be regulated the SF that is tested by regulating piston 1 then
6The pressure of gas density relay, just can the verification density monitor.Its operation key step is as follows:
1. the aviation plug with test article (relay) 14 checkpoint contacts sampling lead docks with the density monitor contact socket on the tester, and verification point sampling lead other end redness (a pair of), black (a pair of) and blue (a pair of) fish folder are connected with warning (a pair of), locking (a pair of) and locking 2 or superpressure (a pair of) contact of density monitor respectively.
2. if use the AC220V power work, connect external power source, the power-on switch; If use self-contained battery work, direct power-on switch, preheating 5 minutes.
3. enter by menu operation and prepare the verification screen.
4. whether observe force value meets the requirements.If force value is on the low side, slowly open air reservoir valve F again, after the observation force value has arrived desired force value, just close air reservoir valve F.
5. counter-clockwise direction is shaken handwheel then, reduces pressure, to during the ratings of the density monitor tested, and according to the prompting on the LCD screen, first verification ratings.And then according to the prompting on the LCD screen, counter-clockwise direction is shaken handwheel again, reduces pressure, and to during the locking value of the density monitor tested, clockwise direction is shaken handwheel again, and pressure boost is up to the warning rreturn value of the density monitor of being tested.
6. print or stores it according to screen prompt.
7. verification is opened air reservoir valve F after hours, shakes handwheel clockwise, till active on earth, closes air reservoir valve F then.This moment the SF in the pressure regulating cylinder
6Gas pushes back SF again
6Among the gas air reservoir.Throw off and connect tracheae.
8. turn off power switch, restore.
Below among each embodiment, the connection of all having omitted instrument stresses the correct acquisition of corresponding 20 ℃ of force value of measured relay, promptly how tester accurately measures absolute pressure relay and relative pressure density monitor.
At the SF that is tested
6Density monitor is absolute pressure relay or relative pressure relay, utilize man-machine communication, (man-machine conversation or artificial selection form can be versatile and flexible, and be unrestricted, for example can adopt external selector button, keyboard or a switch promptly to utilize man-machine interface dialogue or artificial selection; Also can adopt the keyboard on the liquid crystal, also can adopt and put question to the mode of answering, also can adopt the touch-screen on the touch LCD to operate or the like), confirm to instrument.
Adopt absolute pressure transducer to measure to the absolute pressure relay, obtain absolute pressure value, temperature value (obtaining) and SF during then according to test by temperature sensor
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value automatically, finishes this SF
6The performance verification of gas density relay.
This absolute pressure relay is if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; If represent that with the relative pressure value its test result also can be converted into corresponding 20 ℃ of relative pressure values, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Adopt relative pressure sensor to measure to the relative pressure relay, obtain the relative pressure value, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure values automatically, finishes this SF
6The performance verification of gas density relay.
This relative pressure relay is if represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values; And if represent that with absolute pressure value its test result also can be converted into corresponding 20 ℃ of absolute pressure value, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relatively Pressure+ P
Standard atmospheric pressure
In the present embodiment, instrument can be according to the SF that is tested
6Gas density relay is absolute pressure relay or relative pressure relay, utilize man-machine communication, promptly utilize man-machine conversation or artificial selection, finish accurate test with corresponding, suitable pressure transducer respectively separately the density monitor performance of institute's verification.Can not influence measuring accuracy because of atmospheric influence.
Embodiment 2
Utilize the sensor of two kinds of measured pressure value methods, promptly relative pressure sensor and absolute pressure transducer apply same pressure (relative pressure can be 0) and measure, and obtain local atmospheric pressure P with this
Local air pressure=P
Absolute sensor pressure-P
Relative cell pressureAnd this local atmospheric pressure P
Local air pressureBe stored in the instrument.
At the SF that is tested
6Density monitor is absolute pressure relay or relative pressure relay, utilize man-machine communication, (man-machine conversation or artificial selection form can be versatile and flexible, and be unrestricted, for example can adopt external selector button, keyboard or a switch promptly to utilize man-machine conversation or artificial selection; Also can adopt the keyboard on the liquid crystal, also can adopt and put question to the mode of answering, also can adopt the touch-screen on the touch LCD to operate or the like), confirm to instrument.
All utilize the sensor of measuring absolute pressure to test to two types density monitors.
Adopt absolute pressure transducer to measure to the absolute pressure relay, obtain absolute pressure value, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value automatically, finishes this SF
6The performance verification of gas density relay.
This absolute pressure relay is if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; If represent that with the relative pressure value its test result also can be converted into corresponding 20 ℃ of relative pressure values, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Adopt absolute pressure transducer to measure to the relative pressure relay, obtain absolute pressure value, utilize the P that is stored in advance in the instrument then
Local air pressureRevise, promptly by relational expression P
The relative pressure of test=P
The absolute pressure of test-P
Local air pressureObtain the relative pressure value, temperature value and SF during again according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure values automatically, makes test result accurate, finishes this SF
6The performance verification of gas density relay.
To the absolute pressure value that the relative pressure relay adopts absolute pressure transducer to measure, can also handle according to the following steps: temperature value and SF during promptly earlier according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value P with the absolute pressure value that measures
The absolute pressure of 20 tests, utilize the P that is stored in advance in the instrument again
Local air pressureRevise, obtain corresponding 20 ℃ of relative pressure value: P
The relative pressure of 20 tests=P
The absolute pressure of 20 tests-P
Local air pressureFinish this SF
6The performance verification of gas density relay.
This relative pressure relay is if represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values; If represent that with absolute pressure value its test result also can be converted into corresponding 20 ℃ of absolute pressure value, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Utilize the sensor of two kinds of measured pressure value methods, promptly relative pressure sensor and absolute pressure transducer apply same pressure (relative pressure can be 0) and measure, and obtain local atmospheric pressure P with this
Local air pressure=P
Absolute sensor pressure-P
Relative cell pressureAnd this local atmospheric pressure P
Local air pressureBe stored in the instrument.
At the SF that is tested
6Density monitor is absolute pressure relay or relative pressure relay, utilize man-machine communication, (man-machine conversation or artificial selection form can be versatile and flexible, and be unrestricted, for example can adopt external selector button, keyboard or a switch promptly to utilize man-machine conversation or artificial selection; Also can adopt the keyboard on the liquid crystal, also can adopt and put question to the mode of answering, also can adopt the touch-screen on the touch LCD to operate or the like), confirm to instrument.
All utilize the sensor of measuring relative pressure to test to two types density monitors.
Adopt relative pressure sensor to measure to the relative pressure relay, obtain the relative pressure value, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure values, finishes this SF
6The performance verification of gas density relay.
This relative pressure relay is if represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values; If represent that with absolute pressure value its test result also can be converted into corresponding 20 ℃ of absolute pressure value, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Adopt relative pressure sensor to measure to the absolute pressure relay, obtain the relative pressure value, then with the P that is stored in advance in the instrument
Local air pressureRevise, promptly pass through relational expression: P
The absolute pressure of test=P
The relative pressure of test+ P
Local air pressure, obtain absolute pressure value, temperature value and SF during again according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value, makes test result accurate, finishes this SF
6The performance verification of gas density relay.
To the relative pressure value that the absolute pressure relay adopts relative pressure sensor to measure, can also handle according to the following steps: temperature value and SF during earlier according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure value: P
The relative pressure of 20 tests, utilize the P that is stored in advance in the instrument again
Local air pressureRevise, obtain corresponding 20 ℃ of absolute pressure value: P
The absolute pressure of 20 tests=P
The relative pressure of 20 tests+ P
Local air pressureThereby finish this SF
6The performance verification of gas density relay.
This absolute pressure relay is if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; And if represent that with the relative pressure value its test result also can be converted into corresponding 20 ℃ of relative pressure values, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Press relatively Power+ P
Standard atmospheric pressure
Is 0 o'clock with absolute pressure transducer at applied pressure, measures local atmospheric pressure: P
Local air pressure=P
Definitely pass this moment Sensor pressureAnd this local atmospheric pressure P
Local air pressureBe stored in the instrument.
At the SF that is tested
6Density monitor is absolute pressure relay or relative pressure relay, utilize man-machine communication, (man-machine conversation or artificial selection form can be versatile and flexible, and be unrestricted, for example can adopt external selector button, keyboard or a switch promptly to utilize man-machine conversation or artificial selection; Also can adopt the keyboard on the liquid crystal, also can adopt and put question to the mode of answering, also can adopt the touch-screen on the touch LCD to operate or the like), confirm to instrument.
All utilize the sensor of measuring absolute pressure to test to two types density monitors.
Adopt absolute pressure transducer to measure to the absolute pressure relay, obtain absolute pressure value, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value, finishes this SF
6The performance verification of gas density relay.
This absolute pressure relay is if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; If represent that with the relative pressure value its test result also can be converted into corresponding 20 ℃ of relative pressure values, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Adopt absolute pressure transducer to measure to the relative pressure relay, obtain absolute pressure value, utilize the P that is stored in advance in the instrument then
Local air pressureRevise, promptly pass through relational expression: P
The relative pressure of test=P
The absolute pressure of test-P
Local air pressure, obtain the relative pressure value, temperature value and SF during again according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure values, makes test result accurate, finishes this SF
6The performance verification of gas density relay.
To the absolute pressure value that the relative pressure relay adopts absolute pressure transducer to measure, can also handle according to the following steps: temperature value and SF during promptly earlier according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value P with the absolute pressure value that measures
The absolute pressure of 20 tests, utilize the P that is stored in advance in the instrument again
Local air pressureRevise, obtain corresponding 20 ℃ of relative pressure value: P
The relative pressure of 20 tests=P
The absolute pressure of 20 tests-P
Local air pressureFinish this SF
6The performance verification of gas density relay.
This relative pressure relay is if represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values; If represent that with absolute pressure value its test result also can be converted into corresponding 20 ℃ of absolute pressure value, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
By man-machine communication, promptly utilize man-machine conversation, earlier the local atmospheric pressure P of input
Local air pressureAnd this local atmospheric pressure P
Local air pressureBe stored in the instrument.
At the SF that is tested
6Density monitor is absolute pressure relay or relative pressure relay, utilize man-machine communication, (man-machine conversation or artificial selection form can be versatile and flexible, and be unrestricted, for example can adopt external selector button, keyboard or a switch promptly to utilize man-machine conversation or artificial selection; Also can adopt the keyboard on the liquid crystal, also can adopt and put question to the mode of answering, also can adopt the touch-screen on the touch LCD to operate or the like), confirm to instrument.
All utilize the sensor of measuring absolute pressure to test to two types density monitors.
Adopt absolute pressure transducer to measure to the absolute pressure relay, obtain absolute pressure value, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value, finishes this SF
6The performance verification of gas density relay.
This absolute pressure relay is if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; If represent that with the relative pressure value its test result also can be converted into corresponding 20 ℃ of relative pressure values, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Adopt absolute pressure transducer to measure to the relative pressure relay, obtain absolute pressure value, utilize the P that is stored in advance in the instrument then
Local air pressureRevise, promptly pass through relational expression: P
The relative pressure of test=P
The absolute pressure of test-P
Local air pressure, obtain the relative pressure value, temperature value and SF during again according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure values, makes test result accurate, finishes this SF
6The performance verification of gas density relay.
To the absolute pressure value that the relative pressure relay adopts absolute pressure transducer to measure, can also handle according to the following steps: temperature value and SF during promptly earlier according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value P with the absolute pressure value that measures
The absolute pressure of 20 tests, utilize the P that is stored in advance in the instrument again
Local air pressureRevise, obtain corresponding 20 ℃ of relative pressure value: P
The relative pressure of 20 tests=P
The absolute pressure of 20 tests-P
Local air pressureFinish this SF
6The performance verification of gas density relay.
This relative pressure relay is if represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values; If represent that with absolute pressure value its test result also can be converted into corresponding 20 ℃ of absolute pressure value, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Utilize absolute pressure transducer and external relative pressure table meter, apply same pressure survey and go out local atmospheric pressure: P
Local air pressure=P
Absolute sensor pressure-P
The relative pressure gauge pressureBy man-machine conversation, import local atmospheric pressure P then
Local air pressureAnd this local atmospheric pressure P
Local air pressureBe stored in the instrument; Perhaps utilize man-machine conversation directly to import P
The relative pressure gauge pressure, calculate local atmospheric pressure P automatically by instrument
Local air pressure=P
Absolute sensor pressure-P
Relative pressure Gauge pressure, and this local atmospheric pressure P
Local air pressureBe stored in the instrument.
At the SF that is tested
6Density monitor is absolute pressure relay or relative pressure relay, utilize man-machine communication, (man-machine conversation or artificial selection form can be versatile and flexible, and be unrestricted, for example can adopt external selector button, keyboard or a switch promptly to utilize man-machine conversation or artificial selection; Also can adopt the keyboard on the liquid crystal, also can adopt and put question to the mode of answering, also can adopt the touch-screen on the touch LCD to operate or the like), confirm to instrument.
All utilize the sensor of measuring absolute pressure to test to two types density monitors.
Adopt absolute pressure transducer to measure to the absolute pressure relay, obtain absolute pressure value, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value, finishes this SF
6The performance verification of gas density relay.
This absolute pressure relay is if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; If represent that with the relative pressure value its test result also can be converted into corresponding 20 ℃ of relative pressure values, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Adopt absolute pressure transducer to measure to the relative pressure relay, obtain absolute pressure value, utilize the P that is stored in advance in the instrument then
Local air pressureRevise, promptly pass through relational expression: P
The relative pressure of test=P
The absolute pressure of test-P
Local air pressure, obtain the relative pressure value, temperature value and SF during again according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure values, makes test result accurate, finishes this SF
6The performance verification of gas density relay.
To the absolute pressure value that the relative pressure relay adopts absolute pressure transducer to measure, can also handle according to the following steps: temperature value and SF during promptly earlier according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value P with the absolute pressure value that measures
The absolute pressure of 20 tests, utilize the P that is stored in advance in the instrument again
Local air pressureRevise, obtain corresponding 20 ℃ of relative pressure value: P
The relative pressure of 20 tests=P
The absolute pressure of 20 tests-P
Local air pressureFinish this SF
6The performance verification of gas density relay.
This relative pressure relay is if represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values; If represent that with absolute pressure value its test result also can be converted into corresponding 20 ℃ of absolute pressure value, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
According to different areas, instrument is in advance the atmospheric pressure P of locality
Local air pressureBe stored in the instrument.
At the SF that is tested
6Density monitor is absolute pressure relay or relative pressure relay, utilize man-machine communication, (man-machine conversation or artificial selection form can be versatile and flexible, and be unrestricted, for example can adopt external selector button, keyboard or a switch promptly to utilize man-machine conversation or artificial selection; Also can adopt the keyboard on the liquid crystal, also can adopt and put question to the mode of answering, also can adopt the touch-screen on the touch LCD to operate or the like), confirm to instrument.
All utilize the sensor of measuring absolute pressure to test to two types density monitors.
Adopt absolute pressure transducer to measure to the absolute pressure relay, obtain absolute pressure value, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value, finishes this SF
6The performance verification of gas density relay.
This absolute pressure relay is if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; If represent that with the relative pressure value its test result also can be converted into corresponding 20 ℃ of relative pressure values, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Adopt absolute pressure transducer to measure to the relative pressure relay, obtain absolute pressure value, utilize the P that is stored in advance in the instrument then
Local air pressureRevise, promptly pass through relational expression: P
The relative pressure of test=P
The absolute pressure of test-P
Local air pressure, obtain the relative pressure value, temperature value and SF during again according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure values, makes test result accurate, finishes this SF
6The performance verification of gas density relay.
To the absolute pressure value that the relative pressure relay adopts absolute pressure transducer to measure, can also handle according to the following steps: temperature value and SF during promptly earlier according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value P with the absolute pressure value that measures
The absolute pressure of 20 tests, utilize the P that is stored in advance in the instrument again
Local air pressureRevise, obtain corresponding 20 ℃ of relative pressure value: P
The relative pressure of 20 tests=P
The absolute pressure of 20 tests-P
Local air pressureFinish this SF
6The performance verification of gas density relay.
This relative pressure relay is if represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values; If represent that with absolute pressure value its test result also can be converted into corresponding 20 ℃ of absolute pressure value, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Apply same pressure with relative pressure sensor and external absolute pressure gauge meter, measure local atmospheric pressure: P
Local air pressure=P
The absolute pressure gauge pressure-P
Relative cell pressureBy man-machine conversation, import local atmospheric pressure: P then
Local air pressureAnd this local atmospheric pressure P
Local air pressureBe stored in the instrument; Perhaps directly import P by man-machine conversation
The absolute pressure gauge pressure, calculate local atmospheric pressure: P automatically by instrument
Local air pressure=P
The absolute pressure gauge pressure-P
Relatively Cell pressure, and this local atmospheric pressure P
Local air pressureBe stored in the instrument.
Can be 0 also, measure local atmospheric pressure: P with the absolute pressure gauge instrumentation by applied pressure
Work as ground vapour Press=P
The absolute pressure gauge pressureAnd this local atmospheric pressure P
Local air pressureBe stored in the instrument.
At the SF that is tested
6Density monitor is absolute pressure relay or relative pressure relay, utilize man-machine communication, (man-machine conversation or artificial selection form can be versatile and flexible, and be unrestricted, for example can adopt external selector button, keyboard or a switch promptly to utilize man-machine conversation or artificial selection; Also can adopt the keyboard on the liquid crystal, also can adopt and put question to the mode of answering, also can adopt the touch-screen on the touch LCD to operate or the like), confirm to instrument.
All utilize the sensor of measuring relative pressure to test to two types density monitors.
Adopt relative pressure sensor to measure to the relative pressure relay, obtain the relative pressure value, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure values, finishes this SF
6The performance verification of gas density relay.
This relative pressure relay is if represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values; If represent that with absolute pressure value its test result also can be converted into corresponding 20 ℃ of absolute pressure value, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Adopt relative pressure sensor to measure to the absolute pressure relay, obtain the relative pressure value, then with the P that is stored in advance in the instrument
Local air pressureRevise, promptly pass through relational expression: P
The absolute pressure of test=P
The relative pressure of test+ P
Local air pressure, obtain absolute pressure value, temperature value and SF during again according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value, makes test result accurate, finishes this SF
6The performance verification of gas density relay.
To the relative pressure value that the absolute pressure relay adopts relative pressure sensor to measure, can also handle according to the following steps: temperature value and SF during earlier according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure value: P
The relative pressure of 20 tests, utilize the P that is stored in advance in the instrument again
Local air pressureRevise, obtain corresponding 20 ℃ of absolute pressure value: P
The absolute pressure of 20 tests=P
The relative pressure of 20 tests+ P
Local air pressureThereby finish this SF
6The performance verification of gas density relay.
This absolute pressure relay is if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; And if represent that with the relative pressure value its test result also can be converted into corresponding 20 ℃ of relative pressure values, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Press relatively Power+ P
Standard atmospheric pressure
Embodiment 9
By man-machine conversation, import local atmospheric pressure: P earlier
Local air pressureAnd this local atmospheric pressure P
Local Air pressureBe stored in the instrument.
At the SF that is tested
6Density monitor is absolute pressure relay or relative pressure relay, utilize man-machine communication, (man-machine conversation or artificial selection form can be versatile and flexible, and be unrestricted, for example can adopt external selector button, keyboard or a switch promptly to utilize man-machine conversation or artificial selection; Also can adopt the keyboard on the liquid crystal, also can adopt and put question to the mode of answering, also can adopt the touch-screen on the touch LCD to operate or the like), confirm to instrument.
All utilize the sensor of measuring relative pressure to test to two types density monitors.
Adopt relative pressure sensor to measure to the relative pressure relay, obtain the relative pressure value, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure values, finishes this SF
6The performance verification of gas density relay.
This relative pressure relay is if represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values; If represent that with absolute pressure value its test result also can be converted into corresponding 20 ℃ of absolute pressure value, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Adopt relative pressure sensor to measure to the absolute pressure relay, obtain the relative pressure value, then with the P that is stored in advance in the instrument
Local air pressureRevise, promptly pass through relational expression: P
The absolute pressure of test=P
The relative pressure of test+ P
Local air pressure, obtain absolute pressure value, temperature value and SF during again according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value, makes test result accurate, finishes this SF
6The performance verification of gas density relay.
To the relative pressure value that the absolute pressure relay adopts relative pressure sensor to measure, can also handle according to the following steps: temperature value and SF during earlier according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure value: P
The relative pressure of 20 tests, utilize the P that is stored in advance in the instrument again
Local air pressureRevise, obtain corresponding 20 ℃ of absolute pressure value: P
The absolute pressure of 20 tests=P
The relative pressure of 20 tests+ P
Local air pressureThereby finish this SF
6The performance verification of gas density relay.
This absolute pressure relay is if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; And if represent that with the relative pressure value its test result also can be converted into corresponding 20 ℃ of relative pressure values, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Press relatively Power+ P
Standard atmospheric pressure
According to different areas, instrument is in advance the atmospheric pressure of locality: P
Local air pressureBe stored in the instrument.
At the SF that is tested
6Density monitor is absolute pressure relay or relative pressure relay, utilize man-machine communication, (man-machine conversation or artificial selection form can be versatile and flexible, and be unrestricted, for example can adopt external selector button, keyboard or a switch promptly to utilize man-machine conversation or artificial selection; Also can adopt the keyboard on the liquid crystal, also can adopt and put question to the mode of answering, also can adopt the touch-screen on the touch LCD to operate or the like), confirm to instrument.
All utilize the sensor of measuring relative pressure to test to two types density monitors.
Adopt relative pressure sensor to measure to the relative pressure relay, obtain the relative pressure value, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure values, finishes this SF
6The performance verification of gas density relay.
This relative pressure relay is if represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values; If represent that with absolute pressure value its test result also can be converted into corresponding 20 ℃ of absolute pressure value, the conversion relation between absolute pressure and relative pressure is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
Adopt relative pressure sensor to measure to the absolute pressure relay, obtain the relative pressure value, then with the P that is stored in advance in the instrument
Local air pressureRevise, promptly pass through relational expression: P
The absolute pressure of test=P
The relative pressure of test+ P
Local air pressure, obtain absolute pressure value, temperature value and SF during again according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of absolute pressure value, makes test result accurate, finishes this SF
6The performance verification of gas density relay.
To the relative pressure value that the absolute pressure relay adopts relative pressure sensor to measure, can also handle according to the following steps: temperature value and SF during earlier according to test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of relative pressure value: P
The relative pressure of 20 tests, utilize the P that is stored in advance in the instrument again
Local air pressureRevise, obtain corresponding 20 ℃ of absolute pressure value: P
The absolute pressure of 20 tests=P
The relative pressure of 20 tests+ P
Local air pressureThereby finish this SF
6The performance verification of gas density relay.
This absolute pressure relay is if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; And if represent that with the relative pressure value its test result also can be converted into corresponding 20 ℃ of relative pressure values, the conversion relation between absolute pressure and relative pressure is: P absolute pressure=P relative pressure+P standard atmospheric pressure.
The principal feature of the method for calibration of SF6 gas density relay of the present invention is:
1, by instrument and tester's communication, can be during test to the SF that is tested
6Density monitor carries out work (absolute pressure relay) with measuring the absolute pressure value method, and still (the relative pressure relay) that carries out work with measurement relative pressure value method selected or confirmed, can tell the SF that instrument is tested
6The type of density monitor.
2, by the test of instrument own directly or indirectly obtain the local atmospheric pressure of local atmospheric pressure or input or in advance the local atmosphere of storage be pressed onto on the instrument, and make and store local atmospheric pressure on the instrument.
3, can be according to the SF that is tested
6The type of gas density relay, according to the force value method of testing (absolute pressure transducer or relative pressure sensor) of the sensor that adopted, and local atmospheric pressure, revise accordingly, make the force value test result accurate, can not influence measuring accuracy because of atmospheric influence.
4, can be according to the temperature value and the SF in when test
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of force value automatically, finishes SF
6The accurate test of gas density relay performance; Perhaps can be according to the SF that is tested
6The force value method of testing of gas density relay, and the temperature value can be according to test the time are then according to SF
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of force value automatically, again according to the force value method of testing of the sensor that adopted, and local atmospheric pressure, revise accordingly again and obtain 20 ℃ of force value accurately, make test result accurate, can be because of atmospheric influence does not influence measuring accuracy, thus finish SF
6The accurate test of gas density relay performance.
5, by instrument and tester's communication, can be during test to the SF that is tested
6Density monitor carries out work (absolute pressure relay) with measuring the absolute pressure value method, and still (the relative pressure relay) that carries out work with measurement relative pressure value method selected or confirmed, can tell the SF that instrument is tested
6The method of testing of density monitor is promptly with measuring that the absolute pressure value method is carried out work or carrying out work with measurement relative pressure value method; Can be according to the SF that is tested
6The method of testing of gas density relay selects corresponding sensor to measure, and makes the force value test result accurate, can not influence measuring accuracy because of atmospheric influence.And the temperature value can be according to test the time, then according to SF
6The pressure-temperature characteristic relation of gas is converted to corresponding 20 ℃ of force value automatically, finishes SF
6The accurate test of gas density relay performance.
6, instrument and tester's communication way can be versatile and flexible, unrestricted, for example can adopt an external selector button, selector switch, keyboard, also can adopt keyboard on the liquid crystal, also can adopt the touch-screen on the touch LCD to operate, also can utilize man-machine conversation or select and link up or the like.
7, to the absolute pressure relay if represent that with absolute pressure value its test result also is corresponding 20 ℃ of absolute pressure value; If represent that with the relative pressure value its test result also can be corresponding 20 ℃ of relative pressure values.
8, to the relative pressure relay if represent that with absolute pressure value its test result also can be corresponding 20 ℃ of absolute pressure value; If represent that with the relative pressure value its test result also is corresponding 20 ℃ of relative pressure values.
9, instrument can adopt the pressure transducer (absolute pressure transducer) of measuring absolute pressure value and the pressure transducer (relative pressure sensor) of measuring the relative pressure value to measure respectively.
10, instrument can all adopt the pressure transducer (absolute pressure transducer) of measuring absolute pressure value to measure.
11, instrument can all adopt the pressure transducer (relative pressure sensor) of measuring the relative pressure value to measure.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, and all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (5)
1. SF
6Gas density relay checking instrument comprises that a source of the gas provides mechanism, at least one pressure transducer, a temperature sensor, a computer data processing system, an operation keyboard and a display screen, is characterized in that:
Described source of the gas provides mechanism to provide mechanism for the source of the gas of adjustable in pressure;
Described computer data processing system is that absolute pressure relay or relative pressure relay, measuring sensor are absolute pressure transducer or relative pressure sensor, obtain corresponding 20 ℃ of force value according to the relay of being tested, and realizes SF
6The accurate test of gas density relay performance; The data processing content of described computer data processing system comprises:
1), when measuring the absolute pressure relay with absolute pressure transducer, direct temperature value and the SF during according to test with the absolute pressure value that records
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of absolute pressure value;
2), when measuring the relative pressure relay with relative pressure sensor, direct temperature value and the SF during according to test with the relative pressure value that records
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of relative pressure values;
3), when measuring the relative pressure relay with absolute pressure transducer, earlier the absolute pressure value that records is converted into the relative pressure value, its conversion relation formula is: P
The relative pressure of test=P
The absolute pressure of test-P
Local air pressure, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of relative pressure values;
4), when measuring the absolute pressure relay with relative pressure sensor, earlier the relative pressure value that records is converted into absolute pressure value, its conversion relation formula is: P
The absolute pressure of test=P
The relative pressure of test+ P
Local air pressure, temperature value and SF during then according to test
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of absolute pressure value.
2. SF as claimed in claim 1
6Gas density relay checking instrument is characterized in that: the data processing content of described computer data processing system also comprises:
5), when measuring the relative pressure relay with absolute pressure transducer, temperature value and the SF during according to test with the absolute pressure value that records earlier
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of absolute pressure value, is converted into corresponding 20 ℃ of relative pressure values then, and its conversion relation formula is: P
The relative pressure of 20 tests Power=P
The absolute pressure of 20 tests-P
Local air pressure
6), when measuring the absolute pressure relay with relative pressure sensor, temperature value and the SF during according to test with the relative pressure value that records earlier
6The pressure-temperature characteristic relation of gas is converted into corresponding 20 ℃ of relative pressure values, is converted into corresponding 20 ℃ of absolute pressure value then, and its conversion relation formula is: P
The absolute pressure of 20 tests Power=P
The relative pressure of 20 tests+ P
Local air pressure
3. SF as claimed in claim 1 or 2
6Gas density relay checking instrument, it is characterized in that: when described absolute pressure relay is represented with absolute pressure value, its test result is corresponding 20 ℃ of absolute pressure value, and when representing with the relative pressure value, its test result is converted into corresponding 20 ℃ of relative pressure values; When described relative pressure relay was represented with the relative pressure value, its test result was corresponding 20 ℃ of relative pressure values, and when representing with absolute pressure value, its test result is converted into corresponding 20 ℃ of absolute pressure value; Conversion relation between absolute pressure value and the relative pressure value is: P
Absolute pressure=P
Relative pressure+ P
Standard atmospheric pressure
4. SF as claimed in claim 1
6Gas density relay checking instrument is characterized in that: described operation keyboard and display screen join together.
5. SF as claimed in claim 1
6Gas density relay checking instrument, it is characterized in that: the source of the gas of described adjustable in pressure provides mechanism to comprise a pressure regulating cylinder that is used to provide source of the gas, piston is housed in the pressure regulating cylinder, piston is connected with an adjuster bar, handwheel is equipped with in the adjuster bar outer end, handwheel drives adjuster bar and then the drive piston moves in pressure regulating cylinder by rotating, and realizes the adjusting to bleed pressure in the pressure regulating cylinder.
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| CN2006101477634A CN101206169B (en) | 2006-12-22 | 2006-12-22 | Tester for SF6 gas density relay |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101477634A CN101206169B (en) | 2006-12-22 | 2006-12-22 | Tester for SF6 gas density relay |
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| CN101206169B true CN101206169B (en) | 2011-06-29 |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103245908B (en) * | 2012-02-03 | 2015-07-15 | 华北电力科学研究院有限责任公司 | A SF6 and SF6 mixed gas density relay calibration device |
| CN102841282A (en) * | 2012-09-19 | 2012-12-26 | 宁夏电力公司电力科学研究院 | Software compensation type all-temperature SF 6 gas density relay check device |
| CN102879733A (en) * | 2012-09-19 | 2013-01-16 | 宁夏电力公司电力科学研究院 | Gas compensation based full-temperature SF6 gas density relay checking device |
| CN105004629A (en) * | 2015-04-21 | 2015-10-28 | 国家电网公司 | A calibration device for SF6 gas density on-line monitoring equipment |
| CN105116363A (en) * | 2015-10-10 | 2015-12-02 | 西安亚能电气有限责任公司 | Calibrating device for SF6 density relay checking instrument |
| CN108007818B (en) * | 2017-12-20 | 2020-10-02 | 国网河北省电力有限公司电力科学研究院 | A kind of SF6 and SF6 mixed gas density detection device and method |
| WO2021043039A1 (en) * | 2019-09-04 | 2021-03-11 | 上海乐研电气有限公司 | Transformation method for gas density relay, and gas density relay having online self-check function and check method thereof |
| CN110568352A (en) * | 2019-09-04 | 2019-12-13 | 上海卓电电气有限公司 | Density relay maintenance-free intelligent detection device, method and monitoring system |
| CN110530758B (en) * | 2019-09-04 | 2024-07-23 | 上海乐研电气有限公司 | Gas density relay with online self-checking function and checking method thereof |
| CN110535058B (en) * | 2019-09-04 | 2024-05-03 | 上海乐研电气有限公司 | Electrical system with online sampling and checking function and checking method thereof |
| CN110441195B (en) * | 2019-09-04 | 2024-05-14 | 上海乐研电气有限公司 | Gas density relay with online self-checking function and checking method thereof |
| US12099093B2 (en) | 2019-12-11 | 2024-09-24 | Shanghai Roye Electric Co., Ltd. | Method for modifying gas density relay, and gas density relay having online self-checking function and checking method therefor |
| CN114777022A (en) * | 2022-04-07 | 2022-07-22 | 国网冀北电力有限公司张家口供电公司 | Pressure regulating device, electrical equipment gas density diagnosis and control system and method |
| CN115389093A (en) * | 2022-09-19 | 2022-11-25 | 成都千嘉科技股份有限公司 | Pressure detection method and gas meter |
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