CN103353507A - Automatic insulator flaw detection instrument and method - Google Patents
Automatic insulator flaw detection instrument and method Download PDFInfo
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- CN103353507A CN103353507A CN201310246160XA CN201310246160A CN103353507A CN 103353507 A CN103353507 A CN 103353507A CN 201310246160X A CN201310246160X A CN 201310246160XA CN 201310246160 A CN201310246160 A CN 201310246160A CN 103353507 A CN103353507 A CN 103353507A
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Abstract
The invention discloses an automatic insulator flaw detection instrument and method, which can realize on-line real-time detection without outage, ensure the result accuracy and improve the detection accuracy. The automatic insulator flaw detection instrument comprises an ultrasonic receiving module, a signal conditioning unit and an analog/digital conversion unit which are sequentially connected with one another, an infrared core and a digital receiving module which are sequentially connected with each other, a signal processing module connected to the output ends of the analog/digital conversion unit and the digital receiving module, a data storage unit, a SD storage card and a keyboard which are connected with the signal processing module, a fault alarm unit and a display unit which are connected to the output end of the signal processing module, and a power supply module which supplies power to the ultrasonic receiving module, the signal processing module, the signal conditioning unit and the data storage unit. Whether an ultrasonic signal is transmitted from an insulator part is detected by the ultrasonic receiving module, the insulator is subjected to imaging processing by an infrared imaging technology, and whether the thermal field change on the surface of the insulator is abnormal is detected, so that whether the insulator has a fault and the fault position are judged.
Description
Technical field
The present invention relates to a kind of insulator automatic flaw detection detector and detection method, it is a kind of pick-up unit based on UT (Ultrasonic Testing) and infrared imaging flaw detection.Whether this device can be remote, do not cut off the power supply and detect in real time insulator and break down, and acknowledge(ment) signal is analyzed and judged, thereby realize insulator real-time detection and warning.Comprising image processing, data acquisition, data processing, bus and interfacing etc.This device belongs to parameter measurement and monitoring class device technique field.
Background technology
Insulator is the main insulating element of transmission line of electricity especially in the electrical network, is the critical component that ensures electric property.Operating insulator long-term work is in the complex environment of the coexistences such as highfield, mechanical stress, filth and humiture, and the probability that breaks down is very large.Along with the increase of working time, be subjected to the electromechanical combination effect, the insulating property of insulator and mechanical property all can descend.In recent years, damage the electric power accident frequent occurrence that causes because of the high-voltage strut insulator.The fracture of porcelain insulator, cause damage of equipment even personal injury accident.Supply line of transformer station is partly or entirely had a power failure, cause tremendous economic loss and social influence.Therefore, in order to improve the reliability of insulator, need to before insulator breaks down, carry out necessary inspection and maintenance to insulator, avoid the generation of fault.
Insulator can be exposed in the air in operational process always, and the suspended particle in the atmosphere is deposited on insulator surface, accumulates over a long period to be formed into dielectric level decline, even flashover occurs, and this is called as filthy discharge.In discharge process, charging point accelerates under electric field action, electric arc produces high temperature, the thermal motion that air molecule is violent, the air adjacent with discharge channel produced pressure, makes it outside motion, and because the elastic resistance of air, make this part air near the equilibrium position, produce vibration, and propagate down by adjacent air medium, form sound wave always.Because the time of discharge is very short, the frequency spectrum of the sound wave that therefore produces is very wide, can be from tens Hz to several MHz.Therefore, detect the insulator position and whether have ultrasonic signal to send to be a important content during insulator detects.
At present, the insulator detection mode that connects on the tower for high-tension bus-bar mainly is to utilize ultrasonic sensor to carry out the contact flaw detection, such as detection with transversal waves and compressional wave flaw detection.So the rear offline inspection of can only cutting off the power supply, lack flexible, efficient on-line real time monitoring device.
Summary of the invention
For above problem, the present invention proposes a kind of insulator automatic flaw detection detector and detection method, utilize UT (Ultrasonic Testing), detect the insulator position whether sending of ultrasonic signal is arranged, the recycling infrared imagery technique, insulator is carried out imaging processing, detect the insulator surface thermal field and change whether there is abnormal occurrence, thereby judge whether insulator breaks down.It is the drawback of contact measurement method that this scheme has overcome routine techniques, and that has accomplished to need not to cut off the power supply detects in real time online, and has ensured with two kinds of technological means and result's accuracy to have improved Detection accuracy.
Technical solution of the present invention is:
A kind of insulator automatic flaw detection detector, its special character is:
Have the ultrasound wave receiver module, signal condition unit, the AD conversion unit that connect successively, the infrared movement, the digital received module that connect successively, be connected to the signal processing module of AD conversion unit and digital received module output terminal, the data storage cell that is connected with signal processing module, SD storage card and be used for inputting the keyboard of parameters, be connected on fault alarm unit, the display unit of signal processing module output terminal, the power module of power supply is provided for ultrasound wave receiver module, signal processing module, signal condition unit, data storage cell.
It is the ultrasonic sensor of DYA-40-12 that the ultrasound wave receiver module adopts model.
AD conversion unit is configured with spi bus by signal processing module.
The signal condition unit is comprised of pre-amplification circuit, filtering circuit and rearmounted amplifying circuit.
Data storage cell adopts the FLASH storer.
Display unit is LCD display.
A kind of insulator automatic flaw detection detection method, its special character is:
1, adopts such as above-mentioned insulator automatic flaw detection detector;
2, UT (Ultrasonic Testing), receive the ultrasonic signal that faulty insulator is sent by the ultrasound wave receiver module, and signal intensity is converted into relative magnitude of voltage, through carrying out the AD sampling after the conditioning of signal condition unit, be that digital signal is sent into signal processing module with analog signal conversion, and deposit data in data storage cell, by the data in the signal processing module calling data storage unit, whether the size of judging the ultrasonic signal of gained surpasses threshold value, again the result is shown by display unit, if surpass threshold decision fault is arranged, reported to the police by fault alarm unit;
3, infra-red inspection, by the extraneous infrared radiation situation of infrared movement perception, and with the form of permutation image target is shown, by LVDS protocol transmission 16bits digital image information, the digital received module is finished communication interface standard and the data that receive is sent to signal processing module, processing and analysis by the complete paired data of signal processing module, infrared image and analysis result are shown and store in the SD storage card by display unit, if fault is arranged then report to the police and demonstrate infrared image and indicate abort situation by display unit.
When signal processing module is processed and is analyzed data, at first carry out image filtering, image segmentation, obtain the Insulator Infrared Image of UT (Ultrasonic Testing) fault zone, be converted into binary image, analysis image, judge whether normal, such as the normal infrared image of normal demonstration, if undesired sign problem area and reported to the police by failure alarm circuit.
Data storage cell adopts the FLASH storer.
The present invention adopts the DSP platform, and data acquisition, data are processed, and data storage function is integrated in one.Detect for UT (Ultrasonic Testing), partly whether sending ultrasonic signal can know whether insulator is damaged by detecting insulator, if detect ultrasonic signal, must there be abort situation in insulator, if determine concrete abort situation, this just need to carry out infrared detection.The image that obtains by infrared detection and it is carried out a series of processing and analyze finally judging the fault zone of insulator and being shown at display end is realized the detection to insulator.Its beneficial effect is as follows:
1, adopt UT (Ultrasonic Testing) and two kinds of flaw detection patterns of red flaw detection, when contaminated insulator was dry, the leakage current of insulator surface was very little, and continuous when moistening when pollution layer, leakage current constantly increases, and electric current flows through pollution layer and produces Joule heat, causes the insulator surface temperature rise.Leakage current is larger, and its heating effect of current is more obvious, and temperature variation is also more obvious.Any object temperature is higher than all outside radiated infrared energy of absolute zero, and the object of different temperatures is different to extraradial infrared energy, the infrared energy that infrared movement can the detecting object radiation, and be converted into Infrared Thermogram.Infrared image for gained is processed, and whether analysis and the judgement insulator of surveying exist the temperature anomaly part, thereby whether detect insulator normal.Can repeatedly measure for same result, the checking conclusion has improved the accuracy to interpretation of result.
2, can realize insulator detecting in the situation of not cutting off the power supply at a distance, splendid economic benefit and social benefit are arranged.
3. whether the plant automation degree is high, damage can directly presenting insulator after the target detection, if damage, is demonstrated infrared image and is indicated the damage position by display unit.
Description of drawings
Fig. 1 is hardware configuration block diagram of the present invention.
Fig. 2 is the circuit block diagram of signal condition unit.
Fig. 3 is the ultrasound examination schematic flow sheet.
Fig. 4 is infrared imaging treatment scheme synoptic diagram.
Embodiment
Such as Fig. 1, shown in Figure 2, a kind of insulator automatic flaw detection detector, has the ultrasound wave receiver module that connects successively, the signal condition unit, AD conversion unit, the infrared movement that connects successively, the digital received module, be connected to the signal processing module of AD conversion unit and digital received module output terminal, be connected on the RS232 serial ports between infrared movement and the signal processing module, give infrared movement control signal by signal processing module, the data storage cell that is connected with signal processing module, SD storage card and the keyboard that is used for inputting parameters, be connected on the fault alarm unit of signal processing module output terminal, display unit is the ultrasound wave receiver module, signal processing module, the signal condition unit, data storage cell provides the power module of power supply.AD conversion unit (ADC chip) is configured with spi bus by signal processing module, and the signal condition unit is comprised of pre-amplification circuit, filtering circuit and rearmounted amplifying circuit, and data storage cell adopts the FLASH storer, and display unit is LCD display.The digital received module is that digital interface circuit is made of FPGA and peripheral circuit thereof, and data storage function is finished by SD storage card access DSP during infra-red inspection.Signal condition unit, AD conversion unit, digital received module and signal processing module are installed on the block message disposable plates.
As shown in Figure 3, Figure 4, a kind of insulator automatic flaw detection detection method, its special character is:
1, adopts as mentioned above insulator automatic flaw detection detector;
2, UT (Ultrasonic Testing), receive the ultrasonic signal that faulty insulator is sent by the ultrasound wave receiver module, and signal intensity is converted into relative magnitude of voltage, through carrying out the AD sampling after the conditioning of signal condition unit, be that digital signal is sent into signal processing module with analog signal conversion, and deposit data in the FLASH storer, call data in the FLASH storer by signal processing module, whether the size of judging the ultrasonic signal of gained surpasses threshold value, again the result is shown by display unit, if surpass threshold decision fault is arranged, reported to the police by fault alarm unit;
3, infra-red inspection, by the extraneous infrared radiation situation of infrared movement perception, and with the form of permutation image target is shown, by LVDS protocol transmission 16bits digital image information, the digital received module is utilized field programmable gate array (FPGA) to finish communication interface standard and the data that receive is sent to signal processing module, processing and analysis by the complete paired data of signal processing module, show and store into infrared image and analysis result in the SD storage card by display unit, if fault is arranged then report to the police, and demonstrate infrared image and indicate abort situation by display unit.
When signal processing module is processed and is analyzed data, at first carry out image filtering, image segmentation, obtain the Insulator Infrared Image of UT (Ultrasonic Testing) fault zone, be converted into binary image, analysis image, judge whether normal, such as the normal infrared image of normal demonstration, if undesired sign problem area and reported to the police by fault alarm unit.
Described signal processing module (DSP) is made of the TM S320C6000 chip of TI company.TMS320C6000 is the high performance DSP of new generation in the TMS320 series of products, and 8 functional units among the C6000 series CPU can parallel work-flow, and wherein two functional units are the hardware multiplication arithmetic element, have improved widely multiplication speed.DSP adopts has Harvard's bus structure of stand-alone program bus and data bus, and only sheet internal program highway width just can reach 256, but i.e. 8 32 bit instructions of executed in parallel of per cycle; The width of two sets of data buses is respectively 32 in the sheet; In addition, DSP also has 32 DMA private buss of a cover to be used for transmission.Flexibly bus structure so that the data bottleneck restriction of system performance is alleviated greatly.The general purpose register set of C6000 can be supported 32 and 40 fixed-point data operations.Except multi-functional unit, the flowing water technology is to improve another Main Means of DSP executing efficiency.Because the special construction of TMS320C6000, the various operations that functional unit is carried out simultaneously can be carried out synchronously by VLIW long instruction distribution module, make 8 parallel instructions simultaneously by each beat of streamline, have greatly improved the handling capacity of machine.
Digital received module digital interface circuit uses brand to be the XC4VSX55 model fpga of xilinx.It provides than the more DSP special module of other device.Higher performance, lower power consumption and the more arithmetic element of function can be provided.It can realize multiplication-cumulative unit, also can carry out cascade with other similar module, to realize larger design architecture, such as limited impulse response (FIR) wave filter, and meanwhile still can remain operating in normal speed.This performance and extensibility make Virtex-4 FPGA realize the key function of DSP with unprecedented performance and integrated level, and need not to take general logical resource.
Described ultrasound wave receiving element, i.e. ultrasonic sensor is to be the ultrasonic sensor of DYA-40-12 by the model that Foochow Da Yu electronics technology company limited researches and develops.Range is 0.4～12m, and the blind area is blind area 0.4m, and frequency is 40KHz ± 1.5KHz, operating voltage crest voltage＜1500VPP, working temperature-20～+ 80 ℃.The receiving element of infrared unit wherein is the infrared movement of TAU 320 types that FLIR company produces, configuration 19mm optical lens.Have the characteristics such as high precision, high heat sensitivity, low-power consumption, volume be little, lightweight.Its specific targets are: type photodetector: non-refrigeration type focal-plane array (FPA), 324*256 pixel.Spectrum model: 7.5-13.5um.Field range: 24 ° of 18 ° of * (19 mm camera lens).Spatial resolution: 1.25mrad.Video output: 30Hz (NTSC); 25Hz (PAL).Heat sensitivity:＜50mk.Digital interface: LVDS, BT.656, COMS.Control interface: RS-232.Power requirement: 4-6V DC.Size: 44.5*44.5*30 mm.Working temperature :-40 ℃--80 ℃.
Described AD conversion unit is comprised of AD7491 chip, control interface and the signal conditioning circuit that AD company produces, and is responsible for gathering the sensor signal of analog output, and signal conditioning circuit increases the voltage signal of sensor unit output, and carries out filtering.Finish configuration effort to the AD7491 chip based on the control of DSP platform and processing unit by control interface.The AD7491 chip is the modulus conversion chip of successive approximation 8 Channel 12-Bit high precision, low-power consumption, supports parallel and serial line interface, and be 1.6us switching time.
Described power module is converted to the DC voltage of 5V, 3.3V with the 12v DC voltage of input, is respectively ultrasonic sensor, control and processing unit, data storage cell provides power supply.
The course of work of whole device is: when opening the LCD administration page, can select UT (Ultrasonic Testing) or infra-red inspection.If the selection ultrasonic inspection gathers respectively the ultrasonic sensor information of voltage based on the control of DSP platform and processing unit control AD conversion unit, and stores data in the data storage cell.Then data are carried out data and process, judge whether the size of the ultrasonic signal of gained surpasses threshold value, again the result is presented on the lcd screen.If the selection infra-red inspection is input among the DSP through fpga based on the control of DSP platform and processing unit control chart image signal and analyzes, through the analysis of algorithm and process and be presented to the result on the lcd screen again and store in the SD storage card.
(2) software configuration:
This detector software is control and the handling procedure of dsp chip, is responsible for control hardware and realizes data acquisition, data processing and data storage.Software is write under CCS3.3 and xilinx translation and compiling environment, and whole program architecture is mainly by forming with lower module: Clock management module, variable administration module, time delay module, ADC driver module, LCD driver module, timer management module, Interruption module, FLASH storing driver module, data cache module, DSP algoritic module and main program module.The relation of each intermodule is as follows: judge it is also to start the UT (Ultrasonic Testing) module or the infra-red inspection module according to main program module.After starting the UT (Ultrasonic Testing) module, start ADC driver module and timer management module, Interruption module, begin the voltage of ultrasonic sensor is carried out Real-time Collection, and data are deposited in the FLASH storer.After switch was finished gatherer process, the threshold cell in the main program module was triggered, and the data in the FLASH memory module is called in the DSP algoritic module process, and after finishing dealing with the result was transported to LCD display and showed.Structural relation between each module as shown in Figure 3.After starting the infra-red inspection module, start FPGA transport module and timer management module, Interruption module etc., data are called in process in the DSP algoritic module, the result store of handling well is shown in the SD storage card and in LCD display.
Described Clock management module is responsible for finishing frequency division, the frequency multiplication work of program clock.For whole chip provides reference clock.
Described ADC driver module is finished the configuration to the ADC chip, controls its switching rate, conversion accuracy, data transfer mode etc.And read chip by data bus and export data, send in the data cache module.
Described timer management module, Interruption module are finished the initialization to timer in the DSP, and configuration is length regularly, carry out interrupt routine.
Described DSP algoritic module is the software kernels of device.For the UT (Ultrasonic Testing) module, the algorithm of this module is to judge that whether the signal that gathers surpasses threshold value, surpasses threshold value and namely reports to the police.For the infra-red inspection module, the picture signal of input is carried out a series of analysis and processing, judge whether the insulator in the image exists overheated position.Its algorithm flow as shown in Figure 4.The image that obtains is carried out pre-service, comprise filtering, cut apart and binary conversion treatment, again the target area image after processing is analyzed, judge whether the gray-scale map of gained exists the unusual part of gray scale.
Claims (9)
1. insulator automatic flaw detection detector is characterized in that:
Have the ultrasound wave receiver module, signal condition unit, the AD conversion unit that connect successively, the infrared movement, the digital received module that connect successively, be connected to the signal processing module of AD conversion unit and digital received module output terminal, the data storage cell that is connected with signal processing module, SD storage card and be used for inputting the keyboard of parameters, be connected on fault alarm unit, the display unit of signal processing module output terminal, the power module of power supply is provided for ultrasound wave receiver module, signal processing module, signal condition unit, data storage cell.
2. insulator automatic flaw detection detector according to claim 1 is characterized in that: it is the ultrasonic sensor of DYA-40-12 that the ultrasound wave receiver module adopts model.
3. insulator automatic flaw detection detector according to claim 1, it is characterized in that: AD conversion unit is configured with spi bus by signal processing module.
4. insulator automatic flaw detection detector according to claim 1, it is characterized in that: the signal condition unit is comprised of pre-amplification circuit, filtering circuit and rearmounted amplifying circuit.
5. insulator automatic flaw detection detector according to claim 1 is characterized in that: data storage cell employing FLASH storer.
6. insulator automatic flaw detection detector according to claim 1, it is characterized in that: display unit is LCD display.
7. insulator automatic flaw detection detection method is characterized in that:
(1), adopts insulator automatic flaw detection detector as claimed in claim 1;
(2), select UT (Ultrasonic Testing), receive the ultrasonic signal that faulty insulator is sent by the ultrasound wave receiver module, and signal intensity is converted into relative magnitude of voltage, through carrying out the AD sampling after the conditioning of signal condition unit, be that digital signal is sent into signal processing module with analog signal conversion, and deposit data in data storage cell, by the data in the signal processing module calling data storage unit, whether the size of judging the ultrasonic signal of gained surpasses threshold value, again the result is shown by display unit, if surpass threshold decision fault is arranged, reported to the police by fault alarm unit;
(3), select infra-red inspection, by the extraneous infrared radiation situation of infrared movement perception, and with the form of permutation image target is shown, by LVDS protocol transmission 16bits digital image information, the digital received module is finished communication interface standard and the data that receive is sent to signal processing module, processing and analysis by the complete paired data of signal processing module, infrared image and analysis result are shown and store in the SD storage card by display unit, if fault is arranged then report to the police and demonstrate infrared image and indicate abort situation by display unit.
8. a kind of insulator automatic flaw detection detection method according to claim 7, it is characterized in that: when signal processing module is processed and analyzed data, at first carry out image filtering, image segmentation, obtain the Insulator Infrared Image of UT (Ultrasonic Testing) fault zone, be converted into binary image, analysis image judges whether normal, such as the normal infrared image of normal demonstration, if undesired sign problem area and reported to the police by failure alarm circuit.
9. a kind of insulator automatic flaw detection detection method according to claim 7 is characterized in that: data storage cell employing FLASH storer.
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Cited By (7)
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| CN104198578A (en) * | 2014-07-30 | 2014-12-10 | 国家电网公司 | Automatic flaw-detecting and testing system of porcelain post insulator and testing method |
| CN104931586A (en) * | 2015-05-25 | 2015-09-23 | 国家电网公司 | Detection system of intelligent insulator detecting robot |
| CN105223273A (en) * | 2015-10-09 | 2016-01-06 | 清华大学 | A kind of motor train unit crackle detecting instrument |
| CN107968481A (en) * | 2016-10-18 | 2018-04-27 | 北京机电工程研究所 | A kind of Autonomous test intelligent apparatus and method for electric force pole tower |
| CN108214102A (en) * | 2018-01-12 | 2018-06-29 | 哈尔滨理工大学 | A kind of rose cutter wear detecting system and its detection method |
| CN108760814A (en) * | 2018-06-21 | 2018-11-06 | 湖南湖大华龙电气与信息技术有限公司 | A kind of composite insulator is infrared to combine intelligent detecting method and its device with millimeter wave |
| CN113835004A (en) * | 2021-09-06 | 2021-12-24 | 太仓阿尔法数字科技有限公司 | Remote flaw detection method for in-service insulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104198578A (en) * | 2014-07-30 | 2014-12-10 | 国家电网公司 | Automatic flaw-detecting and testing system of porcelain post insulator and testing method |
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| CN108214102A (en) * | 2018-01-12 | 2018-06-29 | 哈尔滨理工大学 | A kind of rose cutter wear detecting system and its detection method |
| CN108760814A (en) * | 2018-06-21 | 2018-11-06 | 湖南湖大华龙电气与信息技术有限公司 | A kind of composite insulator is infrared to combine intelligent detecting method and its device with millimeter wave |
| CN113835004A (en) * | 2021-09-06 | 2021-12-24 | 太仓阿尔法数字科技有限公司 | Remote flaw detection method for in-service insulator |
| CN113835004B (en) * | 2021-09-06 | 2024-02-09 | 太仓阿尔法数字科技有限公司 | Remote flaw detection method for in-service insulator |
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Application publication date: 20131016 |