CN201555573U - High-pressure switch tester with ultrasonic displacement sensor - Google Patents
High-pressure switch tester with ultrasonic displacement sensor Download PDFInfo
- Publication number
- CN201555573U CN201555573U CN2009202281150U CN200920228115U CN201555573U CN 201555573 U CN201555573 U CN 201555573U CN 2009202281150 U CN2009202281150 U CN 2009202281150U CN 200920228115 U CN200920228115 U CN 200920228115U CN 201555573 U CN201555573 U CN 201555573U
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- voltage switch
- reference point
- ultrasonic
- displacement
- ultrasound wave
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Abstract
The utility model provides a high-pressure switch tester with an ultrasonic displacement sensor. The tester adopts an ultrasonic phase-measuring principle, realizes collecting, analyzing, computing, recording, displaying and outputting through an embedded computer system, and realizes functions for testing displacement and the like. When testing, a moving body-testing point of the high-pressure switch is provided with an ultrasonic receiver for testing the phase change of an ultrasonic signal to compute the precise displacement of a point to be tested. The high-pressure switch tester has good characteristics of excellent linearity, long-time stability, high resolution ratio, wide measuring range, small volume, convenient installation, and capability of testing high-speed displacement, and the like, thereby solving the problems when testing the displacement with the traditional method by using a linear resistance sensor.
Description
Technical field
The utility model relates to monitoring technical field, particularly, relates to the correlation technique with the high-voltage switch gear performance test, relates in particular to the high-voltage switch gear displacement measurement of band displacement transducer.
Background technology
Various high-voltage switch gear manufacturers and applying unit need regularly high-voltage switch gear to be tested, and to understand the machinery and the electric property of high-voltage switch gear, guarantee the operation of equipment normal reliable.The displacement of contact and speed etc. when the project of a key is exactly detector switch separating brake and feed motion in the test.
Traditional metering system is to use orthoscopic slide wire resistance displacement transducer to come Displacement Measurement.Use this displacement sensor that many weak points are arranged:
At first, the connecting rod of slide wire resistance sensor must be along its axis rectilinear motion, and a little angle difference of reference point direction of motion and this axis will cause sensor to damage at the volley;
Secondly, the costing an arm and a leg of high-precision slide wire resistance, when the displacement amplitude that requires to test is bigger, then all the more so when needing to adopt the slide wire resistance sensor of bigger length;
Moreover its installation is very difficult, use many off-gauge anchor clamps.The moving component of high-voltage switch gear or be positioned at the space that is difficult for contact, extremely difficult with the slide wire resistance sensor is installed.For the high-voltage switch gear of wanting long term monitoring, the test mode of inconvenience can not adopt especially.
In addition, least it is desirable to satisfy costing dearly of slide wire resistance sensor (length-resistance) linear relationship, the slide wire resistance sensor situation of especially big length is poorer.Repeatedly use to cause concentrated wear, its resistance value homogeneity in the longitudinal direction will variation; Long storage time causes resistance change, thereby can't satisfy Testing requirement.
Because above-mentioned reason, the user who has even have no alternative but in many test items, abandon this important project of displacement detecting.Even the hidden danger of aspects such as the relevant displacement of high-tension switch gear, speed, spring just can not be found.The user also is badly in need of a kind of simple installation, measures accurate, practical and durable displacement transducer.
The utility model content
For overcoming existing linear displacement transducer price height, difficulty be installed, the deficiency of linear difference, the utility model provides a kind of ultrasonic sensor Displacement Measurement that adopts on high voltage switch tester.Emitting head is placed in the fixed position, receives head and be installed on the moving component of switch.Emitting head needn't greatly improve the sensor installation flexibility accurately point-blank with the reception head.On accuracy of measurement, also overcome the deficiency of rectilinear transducer.Thereby can produce the device that a kind of cost is low, performance is good, satisfy user's testing requirement better.
The utility model is realized comprising a kind of displacement measurement with the ultrasonic displacement sensor in high voltage switch tester for solving the problems of the technologies described above:
The ultrasonic displacement sensor, it has the rest position of being installed in and continues the emission hyperacoustic emitting head of 40kHz constant frequency (TX) device according to test request, and ultrasonic emitting head (TX) is launched the ultrasound wave of constant 40kHz frequency in static position of not moving; Has ultrasound wave receiving transducer (RX) device that is installed in certain reference point place on the high-voltage switch gear moving-member, the ultrasound wave acoustic pressure at reference point place is transformed into voltage signal, ultrasound wave receives certain position that is called reference point that head (RX) is fixed on the high-voltage switch gear moving-member, received ultrasonic signal; By processor processing, calculate the displacement of reference point.Receive head and be installed on the moving-member of high-voltage switch gear, the ultrasonic signal with receiving collects among the CPU, thereby calculates the displacement between emitting head and the reception head.
Amplifier links to each other with the reception head of ultrasonic displacement sensor, and the signal that the reference point place is received head output amplifies, and will export the suitable distance of transmission with the form of difference, uses for high voltage switch tester;
Comparer, it links to each other with the output of amplifier, with signal shaping, detects the output zero crossing of amplifier; Amplifier, it is built in the receiving transducer, links to each other with ultrasonic receiver spare, ultrasound wave is received head (RX) amplify at the signal that reference point receives, and output is sent to the distant place of suitable distance with the form of difference; Described ultrasound wave receiving transducer (RX) is built-in with differential amplifier, will receive signal voltage and amplify, and is sent to the distant place of suitable distance reliably with differential mode.The built-in differential amplifier of described ultrasound wave receiving transducer (RX) is by 40kHz, or other frequencies, the Alternating Current Power Supply technology solve isolation between receiving transducer (RX) and the main frame.
The markers grabber, it links to each other with the output of comparer, the markers of timing acquisition signal;
The C8051FC340 microprocessor, it is connected with the output of comparer, the collection of completion bit shift measurement data; PC104 industrial computer module, it is connected by USB 2.0 interfaces with microprocessor and communication mutually, and measurement data is judged, analyzes, proofreaies and correct, calculates, stored and shows;
The principle of work of ultrasonic displacement sensor measurement displacement is as follows:
Receive head (RX) received ultrasonic signal, signal changes square-wave signal into through being compared device after amplifying, and with this signal triggering markers grabber, promptly catches the markers of signal spans zero level in grabber.Adopt quick, high-resolution markers capture technique, per 25 microseconds obtain the real-time phase of a reference point place signal; Per 25 microseconds regularly read markers t
i, t
I+1Adjacent twice o'clock target difference t
I+1-t
iIt promptly is the phase place variation in during 25 microseconds.With this phase place variation accumulative total, thereby the phase change that obtains in one period amounts to.Come the real-time displacement of calculating reference point by the real-time phase of described reference point place signal.Hyperacoustic wavelength is known, draws shift value thereby multiply by wavelength.Have the environment temperature test function, and employ ambient temperature value certainly and proofread and correct the setting numerical value of ultrasound wave at this ambient temperature air medium wavelength.Relation between displacement and the phase place is linear, thereby has guaranteed the highly linear of this principle Displacement Measurement theoretically.
So-called linear, specific to the switch displacement measurement, promptly be in different time and space, as long as the distance of movable body displacement is identical, the test result that obtains should be identical.The high linearity characteristic can guarantee that the absolute error when measuring micro-displacement is little.
In sum, the utlity model has following beneficial effect:
1, displacement sensor structure is simple, and is easy for installation;
2, precision height, linearity height, broad quantum (reaching 1.5m);
3, long-time stability immobilize;
4, can survey high-speed displacement (reaching 25m/s);
Description of drawings
Below by describing the utility model particularly with reference to the accompanying drawings and in conjunction with example, advantage of the present utility model and implementation will be more apparent, wherein content shown in the accompanying drawing only is used for explaining to of the present utility model, and do not constitute the restriction of going up in all senses to of the present utility model, in the accompanying drawings:
Fig. 1 is the outside drawing of the high voltage switch tester of the utility model band ultrasonic displacement sensor;
Fig. 2 is a ultrasonic displacement sensor outside drawing of the present utility model;
Fig. 3 is a wiring schematic diagram of the present utility model;
Fig. 4 is a high-voltage switch gear reclosing test output interface;
Embodiment
What Fig. 2 represented is a ultrasonic sensor cable.Use aviation plug, be connected with high voltage switch tester through socket.When receiving transducer (RX) be in ultrasonic beam that emitting head sends ± 5 ° conical region in, can guarantee effective measurement.The axis of two ultrasonic measurement probes should be installed point-blank as far as possible, to guarantee the intensity of measuring-signal.
In the transmitting probe (TX) ultrasonic device is housed, the 40kHz ultrasound wave of launching constantly after the power drive after process is suitably isolated.According to Doppler effect, moving of sound source will change the hyperacoustic wavelength that is transmitted in the space, destroyed the pacing items of test.Therefore, transmitting probe (TX) should be installed in the static position of high-voltage switch gear body, guarantees sound source position transfixion in test process.
Receiving transducer (RX) is fixed on the high-voltage switch gear moving component that moves with high-voltage switch contact.Received ultrasonic signal.High-voltage switch gear is in the serious power transformation place of electromagnetic interference (EMI), and the feeble signal that reply receiving transducer (RX) receives shields, isolates and amplifies.Alternating source with 40kHz is given receiving transducer (RX) feed power supply, and the purpose that adopts the alternating source feed is to be convenient to realize isolating.The differential amplifier of signal in being built in receiving transducer (RX) is amplified to enough amplitudes, after being transferred to high voltage switch tester in the mode of difference, isolate through high-frequency transformer earlier, amplify through No. the 2nd differential amplifier again, be connected to last difference comparer, obtain and the tested synchronous square wave in reference point place, its rising edge and negative edge align with the acoustic pressure zero crossing strictness in time at displacement measurement reference point place.Perfect shielding and isolation are the keys that realizes ultrasonic displacement sensor test function reliably.
As markers, markers resolution is 0.25 microsecond to one 16 counter to 4MHz clock cycle count.Two 16 bit registers constitute markers grabber A and B respectively, under the triggering of catching pulse, the markers instantaneous value are replicated in the grabber.Grabber A is triggered by the sound source square wave of 40kHz, and grabber B is triggered by the tested square wave of comparer output.Preserved the zero passage markers of sound source among the grabber A; Grabber B has preserved the zero passage markers of tested square wave.
Per 25 microseconds of tester are regularly interrupted once, and interrupt service routine reads the markers that grabber is caught, and calculate the time target of reference point signal during 25 microseconds with the value of catching of adjacent interruption and change, thereby calculate the displacement of reference point exactly.
The time interval of adjacent timing pulse is 0.25 microsecond, and sound wave is propagated 0.085mm during this period.Therefore, the resolution of test displacement is 0.085mm.
The displacement data that the C8051FC340 microprocessor will measure in real time promptly is sent to the PC104 module by USB 2.0 interfaces, is stored, analyzes, calculates and shown by module.
In Figure of description software interface shown in Figure 4, can read displacement-time, speed-time curve and other measurement result of high-voltage switch gear mobile contact in process of the test.
More than be preferred embodiment of the present utility model, those skilled in the art do not break away from essence of the present utility model and spirit, can have multiple flexible program to realize the utility model.Below only be the preferable feasible embodiment of the utility model, be not so limit to interest field of the present utility model that the equivalence that all utilization the utility model instructionss and accompanying drawing content are done changes, and all is contained within the interest field of the present utility model.
Claims (8)
1. be with the high voltage switch tester of ultrasonic displacement sensor, comprise:
The ultrasonic displacement sensor, it is according to test request, and ultrasonic emitting head (TX) is launched the ultrasound wave of constant 40kHz frequency in static position of not moving; Ultrasound wave receives certain position that is called reference point that head (RX) is fixed on the high-voltage switch gear moving-member, received ultrasonic signal; By processor processing, calculate the displacement of reference point;
Amplifier, it is built in the receiving transducer, links to each other with ultrasonic receiver spare, ultrasound wave is received head (RX) amplify at the signal that reference point receives, and output is sent to the distant place of suitable distance with the form of difference;
Comparer, it links to each other with the output of amplifier, with signal shaping, detects the output zero crossing of amplifier;
The C8051FC340 microprocessor, it is connected with the output of comparer, the collection of completion bit shift measurement data;
PC104 industrial computer module, it is connected by USB 2.0 interfaces with microprocessor and communication mutually, and measurement data is judged, analyzes, proofreaies and correct, calculates, stored and shows.
2. the high voltage switch tester of band ultrasonic displacement sensor according to claim 1 is characterized in that, has the rest position of being installed in and continues the emission hyperacoustic emitting head of 40kHz constant frequency (TX) device.
3. the high voltage switch tester of band ultrasonic displacement sensor according to claim 1, it is characterized in that, have ultrasound wave receiving transducer (RX) device that is installed in certain reference point place on the high-voltage switch gear moving-member, the ultrasound wave acoustic pressure at reference point place is transformed into voltage signal.
4. according to the high voltage switch tester of the described band ultrasonic displacement of claim 3 sensor, it is characterized in that, described ultrasound wave receiving transducer (RX) is built-in with differential amplifier, will receive signal voltage and amplify, and is sent to the distant place of suitable distance reliably with differential mode.
5. according to the high voltage switch tester of the described band ultrasonic displacement of claim 4 sensor, it is characterized in that, the built-in differential amplifier of described ultrasound wave receiving transducer (RX) is by 40kHz, or other frequencies, the Alternating Current Power Supply technology solve isolation between receiving transducer (RX) and the main frame.
6. the high voltage switch tester of band ultrasonic displacement sensor according to claim 1 is characterized in that, adopts quick, high-resolution markers capture technique, and per 25 microseconds obtain the real-time phase of a reference point place signal.
7. the high voltage switch tester of band ultrasonic displacement sensor according to claim 6 is characterized in that, comes the real-time displacement of calculating reference point by the real-time phase of described reference point place signal.
8. the high voltage switch tester of band ultrasonic displacement sensor according to claim 1 is characterized in that, has the environment temperature test function, and employs ambient temperature value certainly and proofread and correct the setting numerical value of ultrasound wave at this ambient temperature air medium wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202281150U CN201555573U (en) | 2009-09-15 | 2009-09-15 | High-pressure switch tester with ultrasonic displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202281150U CN201555573U (en) | 2009-09-15 | 2009-09-15 | High-pressure switch tester with ultrasonic displacement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201555573U true CN201555573U (en) | 2010-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202281150U Expired - Fee Related CN201555573U (en) | 2009-09-15 | 2009-09-15 | High-pressure switch tester with ultrasonic displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201555573U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2014359924B2 (en) * | 2013-12-04 | 2019-07-18 | State Grid Corporation Of China | Isolator switch comprehensive tester |
| CN111239570A (en) * | 2020-03-19 | 2020-06-05 | 上海陆根智能传感技术有限公司 | Portable ultrasonic sensor |
-
2009
- 2009-09-15 CN CN2009202281150U patent/CN201555573U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2014359924B2 (en) * | 2013-12-04 | 2019-07-18 | State Grid Corporation Of China | Isolator switch comprehensive tester |
| CN111239570A (en) * | 2020-03-19 | 2020-06-05 | 上海陆根智能传感技术有限公司 | Portable ultrasonic sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100818 Termination date: 20110915 |