CN104833456A - Onsite detection device and method for pressure sensor of valve cooling system - Google Patents
Onsite detection device and method for pressure sensor of valve cooling system Download PDFInfo
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- CN104833456A CN104833456A CN201510290338.XA CN201510290338A CN104833456A CN 104833456 A CN104833456 A CN 104833456A CN 201510290338 A CN201510290338 A CN 201510290338A CN 104833456 A CN104833456 A CN 104833456A
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Abstract
The invention discloses an onsite detection device for a pressure sensor of a valve cooling system. The onsite detection device comprises a pressure controller and a pressure checking platform. The pressure controller comprises an electric pneumatic pump, an air storage tank, an expansion tank and a water box, wherein the output end of the electric pneumatic pump is connected to the air inlet of the expansion tank via the air storage tank, the water outlet of the water box is connected to the water inlet of the expansion tank, and the water outlet of the expansion tank is connected to the pressure checking platform. The pressure checking platform comprises a conveying pipeline, a control valve, the pressure sensor and a draining valve, wherein the water outlet of the expansion tank is connected to one end of the conveying pipeline, the draining valve is arranged at the other end of the conveying pipeline, the pressure sensor is mounted on the conveying pipeline, the control valve is mounted on the conveying pipeline between the pressure sensor and the expansion tank, and the pressure sensor comprises a pressure etalon and a meter to be detected. The invention also discloses an onsite detection method for the pressure sensor of the valve cooling system. Thus, full-automatic highly-reliable onsite pressure sensor detection with hydraulic pressure control is realized.
Description
Technical field
The present invention relates to technical field of HVDC transmission, be specifically related to a kind of valve cooling system pressure transducer on-site detecting device and method.
Background technology
Converter valve cooling system is the necessary backup system of high voltage direct current transmission project, and cooling control system of converter valve realizes that converter valve cooling system reliably controls, effective guarantee of stable operation.DC transmission engineering valve cooling system pipeline pressure is used for providing power for cooling water circulation, and pressure transducer, as the signal gathering unit of converter valve cooling system, is its important component part.By between valve tower each in cooling water circulation, filtration unit, water pump import and export equal pressure, ensure water circulation within system safety operation scope.
Pressure transducer (instrument), as the signal gathering unit of cooling control system of converter valve, is its important component part.At present more domestic engineering pressure sensors because of measuring error cause control system judge by accident pressure anomaly thus mistake regulate pressure or outlet trip accident situation time have existence, reliability control system entire lowering.Currently only delivering to special laboratory by being pulled down by pressure transducer, utilizing air pressure and hydraulic pressure that sensor gathers equivalence to contrast by pressure testers and diagnosing.Pressure testers is primarily of manual pressure pump, standard scale, table to be checked composition.Can be convenient for carrying and detect to scene, but manual pressure pump accurately can not control air pressure causes verification process to owe specification, and exist because manual operation is slipped up the risk causing gauge outfit outrange to be damaged; Data calculate and qualification determination all needs manually to carry out, and inefficiency, reliability is not high.And pressure calibration accurately can detect pressure transducer, but during need interruption maintenance being utilized, instrument to be checked is pulled down and delivers to labs and detect, consuming time longer, and laboratory and checking table to build cost higher.
For current interruption maintenance it is pressed for time, instrument and meter accuracy requirement is high, verification process treats the situations such as specification, develop this device, the defect of pressure testers and pressure calibration can be made up, can realize that a pick-up unit is light is carried into current conversion station scene, and can when interruption maintenance it is pressed for time the pressure transducer of converter valve pure water cooling control system is accurately detected.Meanwhile, this device adopts air pressure Automatic Control, accurately can control air pressure, verification process can be made to standardize, and avoids because manual operation is slipped up the risk causing gauge outfit outrange to be damaged; This device records and logical process automatically by measurement data, automatically judges that whether tensimeter is qualified, and efficiency comparatively pressure testers realizes increasing substantially, and reliability is higher.
Summary of the invention
For the deficiencies in the prior art, an object of the present invention is to provide a kind of valve cooling system pressure transducer on-site detecting device, device can according to the detection node hydraulic pressure of setting, closed-loop control is carried out by pressure standard meter (standard scale) feedback, the air inlet of automatic adjustment electropneumatic pump and solenoid valve and exhaust, accurately control by controlling air pressure realization measurement node hydraulic pressure, reliability is higher.
To achieve these goals, the technical scheme that the present invention takes is:
A kind of valve cooling system pressure transducer on-site detecting device, it comprises pressure controller and pressure calibration, wherein:
Described pressure controller comprises electropneumatic pump, gas-holder, expansion drum, water tank, described electric pneumatic delivery side of pump is connected to the air intake opening of expansion drum by gas-holder, the water delivering orifice of water tank is connected to the water inlet of expansion drum, and the water delivering orifice of expansion drum is connected to pressure calibration;
Described pressure calibration comprises conveyance conduit, operation valve, pressure transducer and draining valve, the water delivering orifice of described expansion drum is connected to one end of conveyance conduit, draining valve is arranged at the other end of conveyance conduit, pressure transducer is installed on conveyance conduit, operation valve is installed on the conveyance conduit between pressure transducer and expansion drum, and described pressure transducer comprises pressure standard meter and table to be checked.
Described pressure controller comprises one further and is connected to the first hand valve between electropneumatic pump and gas-holder.
Two paths are set between described water tank and expansion drum, wherein the first path are provided with the second hand valve, alternate path is provided with motorized valve.
Between described expansion drum and conveyance conduit a hydraulic actuator is installed.
Described operation valve comprises the 5th hand valve and is series at the 3rd hand valve, the first solenoid valve and the 4th hand valve on conveyance conduit successively, the two ends of described first solenoid valve are connected by a bypass conveyance conduit, and the 5th hand valve is installed on this bypass conveyance conduit.
Described valve cooling system pressure transducer on-site detecting device comprises sense terminals further, described sense terminals comprises data acquisition unit and receiving terminal, the output terminal of described pressure standard meter and table to be checked is all connected to the input end of data acquisition unit, and the output terminal of described data acquisition unit is connected to receiving terminal.
Another object of the present invention is to provide a kind of valve cooling system pressure transducer in-situ check and test method, it can according to the detection node hydraulic pressure of setting, closed-loop control is carried out by pressure standard meter (standard scale) feedback, the air inlet of automatic adjustment electropneumatic pump and solenoid valve and exhaust, accurately control by controlling air pressure realization measurement node hydraulic pressure, reliability is higher.
To achieve these goals, the technical scheme that the present invention takes is:
Valve cooling system pressure transducer on-site detecting device carries out a method for Site Detection, and it comprises the following steps:
Step 1, set pressure span detection node according to table to be checked;
Step 2, opening pressure controller, by the hydraulic pressure on electropneumatic pump adjustment conveyance conduit, when the hydraulic pressure on described conveyance conduit reaches the force value of detection node setting, obtain pressure error value, when pressure error value is not more than zero, perform the operation of step 3, otherwise, perform step 4, wherein, described pressure error value is the difference of the pressure parameter of pressure measurement errors and table to be checked, described pressure measurement errors is the absolute value of the difference between the pressure measuring value of pressure standard meter and the pressure measuring value of table to be checked, the pressure parameter of described table to be checked is the product between the pressure survey range of table to be checked and the pressure measurement accuracy of table to be checked, the pressure survey range of table to be checked and the pressure measurement accuracy of table to be checked are parameter of dispatching from the factory,
Step 3, obtain current error value, when current error value is not more than zero, then this table to be checked is qualified, otherwise, perform step 4, wherein, described current error value is the difference of the current parameters of current measurement errors and table to be checked, described current measurement errors is the absolute value of the difference between the current measurement value of pressure standard meter and the current stresses measured value of table to be checked, the current parameters of described table to be checked is the product between the current measurement range of table to be checked and the current measurement precision of table to be checked, the current measurement range of table to be checked and the current measurement precision of table to be checked are parameter of dispatching from the factory,
Step 4, this table to be checked are defective.
Described detection node is multiple, if there is the pressure error value of a detection node in the plurality of detection node or current error value is greater than zero, then this table to be checked is defective.
When the plurality of detection node is detected, first the hydraulic pressure increased on conveyance conduit by electropneumatic pump is detected the up stroke that the plurality of detection node is carried out one by one, and then by the hydraulic pressure that electropneumatic pump reduces on conveyance conduit, the down stroke that the plurality of detection node is carried out one by one is detected, described up stroke detects and at least three detections are carried out in down stroke detection respectively.
Described detection node is seven, 0%, 20%, 40%, 50%, 60%, 80%, 100% of the corresponding gauge pressure range to be checked of force value difference that these seven detection node set, when conveyance conduit being arranged the table to be checked of multiple different pressures range, the plurality of table to be checked is detected one by one.
Compared with prior art, beneficial effect of the present invention is:
1, Site Detection is realized, the defect of pressure testers and pressure calibration can be made up, can realize that a pick-up unit is light is carried into current conversion station scene, and can when interruption maintenance it is pressed for time the pressure transducer of converter valve pure water cooling control system is accurately detected.
2, the detection method that reliability is higher.To hydraulic pressure value directly perceived with become by sensor the current value sent and detect, the down stroke that the up stroke simultaneously risen to hydraulic pressure and hydraulic pressure decline detects, and improves the reliability detected, on average completes one-time detection about 15min consuming time, save detection time.
3, automatic water pressure controls.Device according to the measurement node hydraulic pressure of setting, can carry out closed-loop control by standard scale feedback, automatically adjusts air inlet and the exhaust of exert pressure pump and solenoid valve, realizes measuring node hydraulic pressure accurately control by control air pressure.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of valve cooling system pressure transducer of the present invention on-site detecting device;
Fig. 2 is the structural representation of monitoring terminal;
Fig. 3 is the structural representation of closed loop;
Fig. 4 is the process flow diagram of a kind of valve cooling system pressure transducer of the present invention in-situ check and test method.
Description of reference numerals: 10, pressure controller; 20, pressure calibration; 1, electropneumatic pump; 11, the first hand valve; 2, gas-holder; 21, pressure switch; 3, expansion drum; 4, water tank; 41, the second hand valve; 42, motorized valve; 5, hydraulic actuator; 61, the 3rd hand valve; 62, the first solenoid valve; 63, the 4th hand valve; 64, the 5th hand valve; 7, pressure standard meter; 81, table to be checked; 8n, table to be checked; 91, the 6th hand valve; 92, the second solenoid valve.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
Please refer to shown in Fig. 1, a kind of valve cooling system pressure transducer on-site detecting device, it comprises pressure controller 10 and pressure calibration 20, wherein: pressure controller 10 comprises electropneumatic pump 1, gas-holder 2, expansion drum 3, water tank 4, the output terminal of electropneumatic pump 1 is connected to the air intake opening of expansion drum 3 by gas-holder 2, the water delivering orifice of water tank 4 is connected to the water inlet of expansion drum 3, the water delivering orifice of expansion drum 3 is connected to pressure calibration 20 by hydraulic actuator 5, one first hand valve 11 is set between electropneumatic pump 1 and gas-holder 2, one pressure switch 21 is set between gas-holder 2 and expansion drum 3.Two paths are set between water tank 4 and expansion drum 3, wherein the first path are provided with the second hand valve 41, alternate path are provided with motorized valve 42.
Pressure calibration 20 comprises conveyance conduit, operation valve, pressure transducer and draining valve, the water delivering orifice of expansion drum 3 is connected to one end of conveyance conduit, draining valve is arranged at the other end of conveyance conduit, pressure transducer is installed on conveyance conduit, and operation valve is installed on the conveyance conduit between pressure transducer and expansion drum 3, and pressure transducer comprises pressure standard meter 7 and multiple table to be checked, be respectively table 81 to be checked,, table 8n, n to be checked be greater than 1 positive integer.Pressure standard meter 7 adopts digital pressure gauge matching standard tensimeter or the intelligent pressure module of 0.05 grade, realizes the pressure criteria needed for system.
Operation valve comprises the 5th hand valve 64 and the 3rd hand valve 61, first solenoid valve 62 that is series at successively on conveyance conduit and the 4th hand valve 63, the two ends of the first solenoid valve 62 are connected by a bypass conveyance conduit, 5th hand valve 64 is installed on this bypass conveyance conduit, and draining valve is provided with the 6th hand valve 91 and the second solenoid valve 92.
Please refer to shown in Fig. 2, valve cooling system pressure transducer on-site detecting device comprises sense terminals further, sense terminals comprises data acquisition unit and receiving terminal, data acquisition unit is as information collecting device, can adopt Ni6212 data collecting card, it can send the output signal of pressure standard meter 7 and table to be checked (comprise and send the pressure signal of side from the current signal of the two sensor side and change) to receiving terminal.Receiving terminal can be PC terminal, tablet terminal and mobile phone terminal etc., and these receiving terminals can also carry out communication by communication link (cable network or wireless network) and printing, all-in-one of faxing, and realizes printing and transfer function.Sense terminals is for windows system and ios system development, and adopt LabVIEW graphical language, attainable function comprises: internal registration user logs in; Setting parameter; The instruction of sending measuring air pressure; Record, calculating standard scale and table to be checked; Historical record is inquired about.
Please refer to shown in Fig. 3, hydraulic pressure can carry out fine adjustment according to pressure standard meter 7 feedback pressure signal.Amplify after the pressure signal feed back pressure standard meter 7 (corresponding with the hydraulic pressure of conveyance conduit) and controling parameters (i.e. detection node set force value) carry out difference operation, then electropneumatic pump 1 and the first solenoid valve 62 are controlled, such as, when pressure standard meter 7 feedback pressure signal is less than controling parameters, compression functions is made by the electrical servo of electropneumatic pump 1, be increased on conveyance conduit through the first solenoid valve 62, to increase the pressure signal that pressure standard meter 7 feeds back, otherwise, what then utilize electropneumatic pump 1 returns checking functions, reduce hydraulic pressure, to reduce the pressure signal that pressure standard meter 7 feeds back, it should be noted that, if if the hydraulic pressure of conveyance conduit is zero, then electropneumatic pump 1 does not work, and opens the second solenoid valve 92.
Described device can for current interruption maintenance it is pressed for time, and instrument and meter accuracy requirement is high, and verification process treats the situations such as specification, develops this device, can realize pick-up unit and be easy to carry to scene, and accurately can detect pressure transducer.Valve cooling system pressure transducer is detected to the situation of owing specification, the detection method of constituting criterion by Integrated Simulation in pick-up unit simultaneously.
Valve cooling system pressure transducer in-situ check and test method realizes by automatic checkout system.Automatic checkout system gathers hydraulic pressure data, analysis and calculation, and comprise current detecting unit and pressure transducer power supply providing unit (can measure two-wire system and four-wire system pressure transducer), please refer to shown in Fig. 4, it specifically comprises the following steps.
Step 1: opening pressure controller, set 7 detection node, wherein need to comprise P=0 and P=FS (full scale) two points and be respectively m=1 and m=7, all the other five detection node are respectively 20%FS, 40%FS, 50%FS, 60%FS, 80%FS;
Step 2: open draining valve, closes draining valve when hydraulic pressure is 0, carries out detection at zero point at detection node m=1, gathers hydraulic pressure value and the current value of pressure standard meter;
Step 3: make compression functions by pressure controller electrical servo, increasing hydraulic pressure is next detection node m (hydraulic pressure is non-vanishing), starts up stroke and detects, carry out step 4,5;
Step 4: automatic checkout system, to data analysis, meets if judge: P (m)=| P
m(measured value)-P
m(standard value) |-P
m(range) * P
m(precision)≤0, then carry out step 4, otherwise, then carry out step 10, wherein, the pressure error value that P (m) is detection node m, P
m(measured value) is the pressure measuring value of table to be checked, P
mthe pressure measuring value that (standard value) is pressure standard meter, P
m(range) and P
m(precision) is respectively table to be checked and dispatches from the factory pressure survey range value in parameter (i.e. known quantity) and pressure measurement accuracy value.
Step 5: automatic checkout system, to data analysis, meets if judge: I (m)=| I
m(measured value)-I
m(standard value) |-I
m(range) * I
m(precision)≤0, then carry out step 5, otherwise, then carry out step 10, wherein, the current error value that I (m) is detection node m, I
m(measured value) is the current measurement value of table to be checked, I
mthe current measurement value that (standard value) is pressure standard meter, I
m(range) and I
m(precision) is respectively table to be checked and dispatches from the factory current measurement range value in parameter (i.e. known quantity) and current measurement accuracy value;
Step 6: if m is not equal to 7, then repeat step 3,4,5, otherwise perform step 7;
Step 7: if m=7, then use pressure controller to return checking functions, reducing hydraulic pressure is next detection node m, starts down stroke and detects, carry out step 4,5;
Step 8: if m is not equal to 1, then repeat step 7,4,5;
Step 9: carry out 3 up strokes and to detect and 3 down strokes detect and all meet decision condition, then judgement pressure transducer is qualified.
Step 10: if the result that arbitrary detection node detects (i.e. step 4 and 5) does not meet decision condition, then judge that pressure transducer is defective.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and this embodiment is also not used to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and all should be contained in the scope of the claims of this case.
Claims (10)
1. a valve cooling system pressure transducer on-site detecting device, is characterized in that, it comprises pressure controller (10) and pressure calibration (20), wherein:
Described pressure controller (10) comprises electropneumatic pump (1), gas-holder (2), expansion drum (3), water tank (4), the output terminal of described electropneumatic pump (1) is connected to the air intake opening of expansion drum (3) by gas-holder (2), the water delivering orifice of water tank (4) is connected to the water inlet of expansion drum (3), and the water delivering orifice of expansion drum (3) is connected to pressure calibration (20);
Described pressure calibration (20) comprises conveyance conduit, operation valve, pressure transducer and draining valve, the water delivering orifice of described expansion drum (3) is connected to one end of conveyance conduit, draining valve is arranged at the other end of conveyance conduit, pressure transducer is installed on conveyance conduit, operation valve is installed on the conveyance conduit between pressure transducer and expansion drum (3), and described pressure transducer comprises pressure standard meter (7) and table to be checked.
2. valve cooling system pressure transducer on-site detecting device according to claim 1, it is characterized in that, described pressure controller (10) comprises one further and is connected to the first hand valve (11) between electropneumatic pump (1) and gas-holder (2).
3. valve cooling system pressure transducer on-site detecting device according to claim 1, it is characterized in that, two paths are set between described water tank (4) and expansion drum (3), wherein the first path is provided with the second hand valve (41), alternate path is provided with motorized valve (42).
4. valve cooling system pressure transducer on-site detecting device according to claim 1, is characterized in that, installs a hydraulic actuator (5) between described expansion drum (3) and conveyance conduit.
5. valve cooling system pressure transducer on-site detecting device according to claim 1, it is characterized in that, described operation valve comprises the 5th hand valve (64) and is series at the 3rd hand valve (61), the first solenoid valve (62) and the 4th hand valve (63) on conveyance conduit successively, the two ends of described first solenoid valve (62) are connected by a bypass conveyance conduit, and the 5th hand valve (64) is installed on this bypass conveyance conduit.
6. valve cooling system pressure transducer on-site detecting device according to claim 1, it is characterized in that, described valve cooling system pressure transducer on-site detecting device comprises sense terminals further, described sense terminals comprises data acquisition unit and receiving terminal, the output terminal of described pressure standard meter (7) and table to be checked is all connected to the input end of data acquisition unit, and the output terminal of described data acquisition unit is connected to receiving terminal.
7. the valve cooling system pressure transducer on-site detecting device according to any one of claim 1-6 carries out the method for Site Detection, and it is characterized in that, it comprises the following steps:
Step 1, set pressure span detection node according to table to be checked;
Step 2, opening pressure controller (10), by the hydraulic pressure on electropneumatic pump (1) adjustment conveyance conduit, when the hydraulic pressure on described conveyance conduit reaches the force value of detection node setting, obtain pressure error value, when pressure error value is not more than zero, perform the operation of step 3, otherwise, perform step 4, wherein, described pressure error value is the difference of the pressure parameter of pressure measurement errors and table to be checked, described pressure measurement errors is the absolute value of the difference between the pressure measuring value of pressure standard meter (7) and the pressure measuring value of table to be checked, the pressure parameter of described table to be checked is the product between the pressure survey range of table to be checked and the pressure measurement accuracy of table to be checked, the pressure survey range of table to be checked and the pressure measurement accuracy of table to be checked are parameter of dispatching from the factory, hydraulic pressure on described conveyance conduit is obtained by the pressure measuring value of pressure standard meter (7),
Step 3, obtain current error value, when current error value is not more than zero, then this table to be checked is qualified, otherwise, perform step 4, wherein, described current error value is the difference of the current parameters of current measurement errors and table to be checked, described current measurement errors is the absolute value of the difference between the current measurement value of pressure standard meter (7) and the current stresses measured value of table to be checked, the current parameters of described table to be checked is the product between the current measurement range of table to be checked and the current measurement precision of table to be checked, the current measurement range of table to be checked and the current measurement precision of table to be checked are parameter of dispatching from the factory,
Step 4, this table to be checked are defective.
8. method according to claim 7, is characterized in that, described detection node is multiple, if there is the pressure error value of a detection node in the plurality of detection node or current error value is greater than zero, then this table to be checked is defective.
9. method according to claim 8, it is characterized in that, when the plurality of detection node is detected, first the hydraulic pressure increased on conveyance conduit by electropneumatic pump (1) is detected the up stroke that the plurality of detection node is carried out one by one, and then by the hydraulic pressure that electropneumatic pump (1) reduces on conveyance conduit, the down stroke that the plurality of detection node is carried out one by one is detected, described up stroke detects and at least three detections are carried out in down stroke detection respectively.
10. method according to claim 9, it is characterized in that, described detection node is seven, 0%, 20%, 40%, 50%, 60%, 80%, 100% of the corresponding gauge pressure range to be checked of force value difference that these seven detection node set, when conveyance conduit being arranged the table to be checked of multiple different pressures range, the plurality of table to be checked is detected one by one.
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| CN111664987A (en) * | 2020-06-16 | 2020-09-15 | 马鞍山市亿格仪表有限公司 | Combined refrigerant pressure gauge for refrigerating unit and installation method thereof |
| CN111679115A (en) * | 2020-06-10 | 2020-09-18 | 中国南方电网有限责任公司超高压输电公司大理局 | Detection method for working states of sensors of pincerlike ammeter and valve water cooling equipment |
| CN114575818A (en) * | 2022-03-31 | 2022-06-03 | 中国石油大学(北京) | Fracturing method based on gas-liquid driving pulse |
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