CN104198578A - Automatic flaw-detecting and testing system of porcelain post insulator and testing method - Google Patents
Automatic flaw-detecting and testing system of porcelain post insulator and testing method Download PDFInfo
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- CN104198578A CN104198578A CN201410370484.9A CN201410370484A CN104198578A CN 104198578 A CN104198578 A CN 104198578A CN 201410370484 A CN201410370484 A CN 201410370484A CN 104198578 A CN104198578 A CN 104198578A
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Abstract
The invention provides an automatic flaw-detecting and testing system of a porcelain post insulator and a testing method. The method has the characteristics that ultrasonic detection and infrared measurement are adopted, and failed parts can be found, so that the damage of the failed parts to the whole system can be reduced to a greatest extent, the service life of equipment can be prolonged, catastrophic accidents can be avoided, simultaneously the specific parts to be repaired can be determined and the stop of the whole system is avoided; for new equipment just put into operation, valuable and original data information can be provided for an operator; for repaired equipment, the detection can ensure normal working of the equipment, so that the working efficiency of the equipment can be further improved.
Description
Technical field
The present invention relates to a kind of porcelain strut insulator automatic flaw detection test macro and method of testing.
Background technology
In transformer station, have a large amount of equipment of transformer, bus, disconnector, isolating switch, coupling condenser, high-tension cable etc., the quality of power equipment running status directly determines safety and the benefit of electric system.If any equipment occurs that abnormal working position is processed not in time and develops into possibly fault, even cause device damage or personal injury, develop into immeasurable consequence.High-voltage pillar porcelain insulator is used widely at power system transformer substation, and whether most important to electric power netting safe running its security of operation is.But because pillar is by the difference of the quality of porcelain insulator, operation, maintenance, detection means and detection level, usually can't find defect and the hidden danger of equipment.In recent years, because damaging the electric power accident causing, high-voltage strut insulator frequently occurs.The fracture of porcelain insulator, causes even personal injury accident of device damage.Supply line of transformer station is partly or entirely had a power failure, cause tremendous economic loss and social influence.
The power outage of introducing a few cause insulator fractures below and cause:
On April 29th, 1991, there is 220kV isolation switch insulation together and rupture and cause busbar grounding, female differential work in operation in certain generating plant, causes five 220kV circuits and two unit trippings; Electric substation of Mou power administration January 7 in 1992 disconnecting link insulator fracture of root short circuit grounding in the operation that recovers power transmission, causes power outage; The calendar year 2001 Liang Ge of power administration electric substation there is on the same day 220kV support insulator fracture, disconnector collapses, the major accidents that cause transformer station all to have a power failure.On October 24th, 2002, certain Chi Han of power supply administration becomes 110 kilovolts of I section bus disconnecting link C phase support insulator fractures, causes local power outage; On March 15th, 2003, certain power supply administration's foot bridge becomes 110kV bus support column porcelain bottle fracture etc.2004 there are two Rupture of Post Insulator accidents in Beijing Power Supply Bureau, are wherein personnel casualty accidents together; There is in succession pillar fracture major accident in Cangzhou, Hengshui, Handan San Ju transformer station in Hebei province within the short time of 20 days in November, 2005, and transformer station out of the ordinary caused the power failure major accident at whole station, to these three accident National Electricity Co.s in the whole nation each electrical network circulate a notice of; In Guangzhou cogeneration plant operation in 2006, there is pillar fracture, cause power outage; 220kV transformer station of power supply administration of Shaanxi Province disconnecting link support insulator fracture in April in the same year, cause power outage, such accident also has a lot at home, often have every year a lot of accidents that rise to occur at each electrical network, the generation of high-voltage pillar porcelain insulator fracture accident brings serious harm to safe and stable operation and staff's personal safety of electrical network.To thoroughly change this situation, only insulator choose, install, debug, move and the links such as maintenance is set up successive check, could eliminate defect and hidden danger, avoid the generation of accident, guarantee the safe operation of electrical network.
Summary of the invention
Goal of the invention: the invention provides a kind of porcelain strut insulator automatic flaw detection test macro and method of testing, its objective is that solving porcelain strut insulator insulation lacks fault and damage, easily produce the problem of accident impact safety in production.
technical scheme: the present invention is achieved through the following technical solutions:
A kind of porcelain strut insulator automatic flaw detection test macro, is characterized in that: this system comprises master controller, infrared temperature-test sensor and ultrasonic range finder sensor; Infrared temperature-test sensor and ultrasonic range finder sensor are all connected to master controller.
On master controller, be also connected with calendar clock, keyboard, LCD demonstration and EEPROM storage.
Ultrasonic range finder sensor is the serial electrostatic transducer of enhancement mode 600 of overdelicate 6500 measurement module plates.
Infrared sensor functional characteristics: probe size: M12 × 1, long 87mm, stainless steel casing.Temperature measurement range :-20～350 DEG C, adopt firm plating silicon camera lens, need not cooling tolerable environment temperature 75 DEG C, signal is processed adjustable, has optional usb data interface and software, operating voltage range: 5～7 VDC, 12～28VDC; Distance coefficient is than being 10:1.
The porcelain strut insulator automatic flaw detection method of testing of utilizing above-mentioned porcelain strut insulator automatic flaw detection test macro to implement, is characterized in that:
This method utilizes primary controller control AD to carry out data acquisition and processing (DAP) to ultrasonic sensor and infrared temperature sensor, receives external key input, controls liquid crystal display, controls EEPROM storage chip and PCF8563 calendar clock chip, is specially:
Ultrasonic measurement
The ultrasonic measurement of system is mainly the method that adopts timer counter, utilize INIT pin and the ECHO pin of ultrasonic sensor to be connected with PD6 with the PC0 of master controller respectively, metering system adopts under single echo mode of operation, it is required under this pattern that what do is exactly to wait for returning of signal transmission, the output of every foot and return need 0.9 millisecond, return signal is exaggerated and exports as a high level signal, INIT become high level and ECHO output become time between high level and sensor and measurement target defect be proportional, if needed, in the time preparing transmission next time, can return to a low level INIT signal and then make it become high level, so just can make the cycle repeat,
Infrared survey
The Infrared survey of system is mainly that employing master controller is that AVR control serial AD conversion chip ADS784l completes, ADS784l communicates by 6 line serial line interfaces and AVR, and interface is simple and convenient, a change-over period needs 24 clock period, wherein 8 for Input Control Word, and 16 for reading transformation result; Chip is locked at rising edge clock in all positions of control word, transformation result is shifted out by turn at the negative edge of clock, all immigrations and the data that shift out be all high-order at front, low level rear, it should be noted that, ADS7841 is 12 A/D converters, and its transformation result only has 12, therefore shifting out after 12 results, 4 clocks that also need to make a gift to someone complete whole transfer process, weave into the I/O port of AVR and simulate above-mentioned sequential, complete A/D transfer process;
After A/D converts, need to process the digital signal after conversion, filtering noise, improves output signal-to-noise ratio, adopts the method filtering noise of limit filtration and average value filtering in method, in temperature survey process, 10 A/D conversions of each startup continuously, deposit the result of 10 A/D conversions in array in, in method, first from this array, reject maximal and minmal value, then remaining 8 numbers are got to its average as last A/D transformation result.
advantage and effect:
The invention provides a kind of porcelain strut insulator automatic flaw detection test macro and method of testing, the method adopts ultrasound examination and Infrared survey, ultrasound examination is one of lossless detection method, Non-Destructive Testing is not destroy under prerequisite, checks the general designation of the various technical methods of workpiece gross imperfection or measuring workpieces feature.The instrument that uses the method for Ultrasonic Detection to detect is referred to as ultra-sonic defect detector.Its principle is: when ultrasound wave is propagated in detected material, the acoustic characteristic of material and the variation of interior tissue produce certain impact to hyperacoustic propagation, are called Ultrasonic Detection by the detection Knowing material performance to ultrasound wave degree of susceptibility and situation and the technology of structural change.Supersonic detection method has through transmission technique, pulse reflection method, tandem method etc. conventionally.
Ultra-sonic defect detector of a great variety, but in actual flaw detection process, pulse reflection ultra-sonic defect detector application the most extensive.Generally in uniform material, the existence of defect will cause the discontinuous of material, this discontinuous the inconsistent of acoustic impedance of often causing again, by reflection theorem, we know, ultrasound wave will reflect on the interface of the medium of two kinds of different acoustic impedances, the size of the energy reflecting and the difference of interface both sides medium acoustic impedance and the orientation of interface, big or small relevant.Pulse reflection ultra-sonic defect detector is exactly around this principle to design.
Pulse reflection ultra-sonic defect detector major part is A sweep mode, and the horizontal ordinate that so-called A sweep display mode is display is travel-time or the propagation distance of ultrasound wave in detected material, and ordinate is the amplitude of ultrasonic reflections ripple.For example, in a steel workpiece, there is a defect, due to the existence of this defect, cause and between defect and Steel material, formed the interface between a different medium, acoustic impedance difference between interface, after the ultrasound wave of transmitting runs into this interface, will reflect, the energy reflecting is received by probe again, in display screen, certain position of horizontal ordinate will show the waveform of a reflection wave, and this position of horizontal ordinate is exactly the degree of depth of defect in detected material.The height of this reflection wave and shape, because different defects is different, have reflected the character of defect.
All insulation shortcoming faults and damaging likely of power equipment, automatic flaw detection instrument can be monitored the insulator of operating high-tension apparatus, can find early some minor issues, thereby avoid the generation of most of serious problems, improve the operation conditions of equipment, increase security, the reliability of system simultaneously, made user satisfied.This instrument is to operating used equipment, all equally effective to the new equipment just having put into operation and the equipment that completes repairs.To operating used equipment, it can find out its inoperative component, reduces to greatest extent the infringement that it causes whole system, the life-span of extension device, and averting a calamity property fault, the while can be determined the concrete position of repairing, has avoided closing of whole system; To the new equipment just having put into operation, can be operations staff valuable raw data data is provided; The equipment that those have been completed repairs, its detection can be sure of the normal of their work, thereby further increases the work efficiency of equipment.
brief description of the drawings:
Fig. 1 is UT (Ultrasonic Testing) control circuit structural drawing;
Fig. 2 is excusing from death measurement procedure figure;
Fig. 3 is the basic conversion timing sequence of ADS7841.
embodiment:below in conjunction with accompanying drawing, the present invention will be further described:
Detect at present several conventional detection methods of insulator and have electric field measurement method, leakage current method, ultrasonic Detection Method, infrared measurement of temperature method etc.Along with the pay attention to day by day to power grid security, whether defects of insulator detection technique detects with regard to it focus that more effectively becomes research online.Due to the singularity of online insulator, it detects extremely difficult online.Directly contact, do not have High-Voltage Insulation problem to perplex although adopt non electrical quantity detection method not have advantages of with measured, but because its measurement is subject to all external conditions as cost, the condition of equipment own, external factor affect and the restriction of equipment operating complexity etc., be widely used in practice difficult.
With regard to its method, in electric weight detection method, although spread voltage method has intuitively, can judge exactly the feature that Insulators Used changes, its measurement of need to ascending a height, the high weakness of work hazard level also make its application potential be restricted; Insulation resistance method is measured and is carried out at low pressure end, can measure exactly the situation of change of insulation resistance, but this value not only reflects the degradation of insulator, and closely related with a lot of other factors, therefore be also difficult to accurately reflect the degradation of insulator, and be difficult to directly judge the accurate location of bad value insulator, the possibility of actual widespread use is separately also little; The principle of pulse current method based on corona discharge, is subject to the impact of external factor less, and day by day perfect along with artificial intelligence technology development solves damaged insulator location by artificial neural network Fuzzy Identification, and problem has become possibility; Its feature that can detect at low pressure end is also for condition that provides is provided for it.
In non electrical quantity detection method, start from middle 1960s as infrared technique being applied to power equipment monitoring abroad, office of State Grid of Sweden successfully applies thermal infrared imager and has carried out the fault diagnosis of power equipment.Start the seventies thermal imaging system to be contained on automobile or helicopter substation equipment or ultra-high-tension power transmission line web member fault are done to the touring detection of productivity, and work up respectively corresponding technical manual or infrared diagnostics failure criterion.Infrared detection technology generally uses in developed country.Nineteen ninety international conference on large HV electric systems (CIGIE) has been affirmed fully electrical equipment fault infrared diagnosis technology, and points out that this technology will play a significant role from traditional preventative trouble hunting system at power equipment to advanced foreseeability State Maintenance system development.2006, the transformer in U.S. Bmcher power station, installed more than 300 load ratio bridging switch watch-dog, so that temperature rise is monitored to shunting switch.
China's electric system is domestic research application infrared technique industry relatively early, research and development power equipment infrared monitoring technology begins the beginning of the seventies, utilize the infrared thermometer of domestic development to detect the exposed hot joint of crossing of operating electrical equipment, the mid-80, Ji Jia power specialty research institute successively introduces more advanced opticmechanical scanning thermal imager, actively develop the helicopter line walking infrared detection test of sending out converting equipment fault detect test and 220kV and 110kV transmission line of electricity, and obtained good result.After the nineties, except further expansion Site Detection, some electric power researchs and power supply department associating, by the simulation test research to multiple high voltage electric equipment internal diversion loop fault and insulation fault, and the experience accumulating in conjunction with Site Detection, now grasp the appearance infrared thermal image features of all kinds of high voltage electric equipments inside and outside fault, accumulated temperature changing regularity and a large amount of typical infared spectrum of the different inside and outsides of various kinds of equipment faults.Not only high voltage electric equipment inside and outside fault type is made to etiologic diagnosis, and provide the quantitative Diagnosis of abort situation and fault size, and the factors and the countermeasure that affect Fault Diagnosis for Electrical Equipment accuracy are also furtherd investigate, and aspect high voltage electric equipment internal fault and the diagnosis of high-pressure porcelain insulator breakdown, international most advanced level or leading position are reached.
In recent years along with the appearance of advanced infrared thermography and the raising of infrared detection level, and the issuing and implementation of power industry standard DL/T664-2008 " charging equipment infrared diagnosis technology application directive/guide ", electric system classifies infrared detection project as the content that high voltage electric equipment regularly detects and patrols and examines as more widely, annual " great " or " promptly " defects in a large number of all having found in time in to the detection of electric current pyrogenicity type equipment, for safety and the economical operation of electric system provide powerful guarantee.In daily tour, generally all use portable infrared point Wen Yi to carry out emphasis to the connector temperature of load heavier equipment and important load equipment and make an inspection tour test.The temperature field of display device very clearly of infrared thermoviewer, the entirety heating situation of equipment is done to observe very intuitively, extremely also finding very soon of difference temperature to same equipment, it have stable, reliable, thermometric is rapid, resolution is high, intuitively, be not subject to the advantage such as electromagnetic interference (EMI) and information acquisition, storage, processing and easy analysis, has an irreplaceable advantage of warm instrument.But infrared thermoviewer also exist weight large, use the shortcomings such as inconvenience and price, therefore infrared thermoviewer will be served as the indispensable instrument reality not enough of the daily tour of operations staff.
Also have, the laser-Doppler vibratory drilling method different feature that is the centre of oscillation frequency of utilizing the insulator having ftractureed when normal, by external force as knocked steel tower or the ultrasound wave that ultrasonic generator produced parabolic type catoptron being aimed to tested insulator, or aim at tested insulator with lasing light emitter, to evoke the microvibration of insulator, then the tested insulator of laser alignment Laser doppler seanning being sent, according to the analysis of the frequency spectrum to the signal reflecting, thereby obtain the centre of oscillation frequency values of this insulator, judge accordingly the quality of this insulator; Ultrasonic Detection Method is based on entering into the communication process of another kind of medium when ultrasound wave from a kind of medium, reflects, the principle realization of refraction and mode conversion (P-wave And S conversion) at the interface of two media.The reflection wave of the pulse ultrasonic wave sending by reception ultrasonic generator (being called transducer) in the time entering insulator medium and pass insulator medium limits between the lane place of insulator.When insulator occurs when " cracking ", on the time shaft of the reflection wave receiving by occurring the reflection wave of this defect, by the size and location of this defect waves on time shaft, can judge the concrete condition of defect in insulator.Laser Doppler interferometry is bulky, heavy, use and keep in repair complexity, high cost shortcoming and two kinds of detection methods detects invalid problem to uncracked bad value insulator, has limited the scope of application of these two kinds of detection methods.
The coupling that ultrasonic Detection Method exists and the performance issue of decay and ultrasonic transducer do not have large breakthrough at present in remote remote measurement, and still in the stage of fumbling, this kind equipment is mainly used in online detection and the laboratory verification that enterprise produces at present.Therefore, the band electric telemetry of this project Gonna breakthrough in safe distance scope, finds a kind of ultrasonic effective method of detection.
As shown in Figure 1, the invention provides a kind of porcelain strut insulator automatic flaw detection test macro, this system comprises master controller, infrared temperature-test sensor and ultrasonic range finder sensor; Infrared temperature-test sensor and ultrasonic range finder sensor are all connected to master controller.
On master controller, be also connected with calendar clock, keyboard, LCD demonstration and EEPROM storage.
Ultrasonic range finder sensor is the serial electrostatic transducer sequence of the enhancement mode 600 based on overdelicate 6500 measurement module plates, and new voltage control circuit can make working sensor under the power supply of 6～24 VDC.The output of TTL harmony open collector comprises that pull-up resistor, the configuration of new oscillatory circuit can make this unit external trigger, also can under the frequency of 5 Hz, answer by sense of continuity.Thereby can making device reduce clutter in sonar applications, numerical control gain and bandwidth varying amplifier can carry out protrusion of surface detection.Typical case's absolute precision is full scale reading ± 1%.The compact comprehensive Design that 600 Series Intelligent sensors are new can make device easily develop.
Infrared sensor functional characteristics: probe size: M12 × 1, long 87mm, stainless steel casing.Temperature measurement range :-20～350 DEG C, adopt firm plating silicon camera lens, need not cooling tolerable environment temperature 75 DEG C, signal is processed adjustable, has optional usb data interface and software, operating voltage range: 5～7 VDC, 12～28VDC; Distance coefficient is than being 10:1.
The porcelain strut insulator automatic flaw detection method of testing of utilizing above-mentioned porcelain strut insulator automatic flaw detection test macro to implement, is characterized in that:
In Fig. 1, the major function of primary controller is to control AD ultrasonic sensor and infrared temperature sensor are carried out to data acquisition and processing (DAP), receives external key input, controls liquid crystal display, controls EEPROM storage chip and PCF8563 calendar clock chip.Single-chip microcomputer essence is that a computer system is integrated on a chip, and its advantage is little, the lightweight low price of volume, is application and the exploitation condition of providing convenience.Reliability is high, function is strong, speed is fast, price low in energy consumption is low is the important indicator of weighing single-chip microcomputer performance always.The reasons such as early stage single-chip microcomputer is high mainly due to technique and design level, power consumption is high and interference free performance is poor, adopt higher divide ratio to clock division mostly, make to make that the cycle is long, execution speed is slow.Improve clock frequency and dwindle the measures such as divider ratio although later CMOS single-chip microcomputer adopts, this state is not by thoroughly take on a new look (as MCS51 and MCS51 compatible).AVR single-chip microcomputer is thoroughly broken this used equipment general layout, has abolished the machine cycle, abandons sophisticated vocabulary U (Complex Instruction Set CPU, CISC) and pursues the complete way of instruction; Adopt reduced instruction set computer U (Reduced Instruction Set CPU, RISC), using word as instruction length unit, abundant in content behaviour's number and operational code are arranged in a word, and fetch phase is short, again can prefetched instruction, realize line production, therefore can highly carry out instruction.AVR single-chip microcomputer is learnt wildly from other's strong points, and is 8 outstanding persons in machine.
Ultrasonic measurement
The ultrasonic measurement of system is mainly the method that adopts timer counter, the INIT pin of ultrasonic sensor and ECHO pin are connected with PD6 with the PC0 of AVR respectively, metering system adopts under single echo mode of operation, required under this pattern what do is exactly to wait for returning of signal transmission, the output of every foot and return to 0.9 millisecond of about needs.Return signal is exaggerated and exports as a high level signal.INIT become high level and ECHO output become time between high level and sensor and measurement target defect be proportional, distance proportion 100:1.If needed, in the time preparing transmission next time, can return to a low level INIT signal and then make it become high level, so just can make the cycle repeat.Excusing from death measurement procedure as shown in Figure 2.
Infrared survey
The Infrared survey of system is mainly to adopt AVR to control serial AD conversion chip ADS784l to complete, and ADS784l communicates by 6 line serial line interfaces and AVR, and interface is simple and convenient.The basic conversion timing sequence of ADS7841 as shown in Figure 3.As can be seen from Fig. 3, change-over period needs 24 clock period, and wherein 8 for Input Control Word, and 16 for reading transformation result.Chip is locked at rising edge clock in all positions of control word, and transformation result is shifted out by turn at the negative edge of clock.All immigrations and the data that shift out be all high-order at front, low level rear.It should be noted that, ADS7841 is 12 A/D converters, and its transformation result only has 12, therefore shifting out after 12 results, 4 clocks that also need to make a gift to someone complete whole transfer process.Weave into the I/O port of AVR and simulate above-mentioned sequential, complete A/D transfer process.
After A/D converts, need to process the digital signal after conversion, filtering noise, improves output signal-to-noise ratio.In program, adopt the method filtering noise of limit filtration and average value filtering.In temperature survey process, 10 A/D conversions of each startup continuously, deposit the result of 10 A/D conversions in array in.In program, first from this array, reject maximal and minmal value, then remaining 8 numbers are got to its average as last A/D transformation result.
In a word, diagnose by ultrasound examination, can prevent insulator breakdown, change Maintenance management system, make it from preventative, or even repairing under the emergency circumstance becomes as foreseeability maintenance.Ultrasonic Diagnosis technology can be described as the eyes of equipment management work, and it makes power equipment maintaining walk out the epoch blindly.Prediction thus, ultrasonic insulator flaw detection is easy to large-scale promotion and uses, and will create good society and economic benefit.
Claims (5)
1. a porcelain strut insulator automatic flaw detection test macro, is characterized in that: this system comprises master controller, infrared temperature-test sensor and ultrasonic range finder sensor; Infrared temperature-test sensor and ultrasonic range finder sensor are all connected to master controller.
2. porcelain strut insulator automatic flaw detection test macro according to claim 1, is characterized in that: on master controller, be also connected with calendar clock, keyboard, LCD demonstration and EEPROM storage.
3. porcelain strut insulator automatic flaw detection test macro according to claim 1, is characterized in that: ultrasonic range finder sensor is the serial electrostatic transducer of enhancement mode 600 of overdelicate 6500 measurement module plates.
4. porcelain strut insulator automatic flaw detection test macro according to claim 1, is characterized in that: infrared sensor functional characteristics: probe size: M12 × 1, long 87mm, stainless steel casing;
Temperature measurement range :-20～350 DEG C, adopt firm plating silicon camera lens, need not cooling tolerable environment temperature 75 DEG C, signal is processed adjustable, has optional usb data interface and software, operating voltage range: 5～7 VDC, 12～28VDC; Distance coefficient is than being 10:1.
5. the porcelain strut insulator automatic flaw detection method of testing of utilizing the porcelain strut insulator automatic flaw detection test macro described in claim 1 to implement, is characterized in that:
This method utilizes primary controller control AD to carry out data acquisition and processing (DAP) to ultrasonic sensor and infrared temperature sensor, receives external key input, controls liquid crystal display, controls EEPROM storage chip and PCF8563 calendar clock chip, is specially:
Ultrasonic measurement
The ultrasonic measurement of system is mainly the method that adopts timer counter, utilize INIT pin and the ECHO pin of ultrasonic sensor to be connected with PD6 with the PC0 of master controller respectively, metering system adopts under single echo mode of operation, it is required under this pattern that what do is exactly to wait for returning of signal transmission, the output of every foot and return need 0.9 millisecond, return signal is exaggerated and exports as a high level signal, INIT become high level and ECHO output become time between high level and sensor and measurement target defect be proportional, if needed, in the time preparing transmission next time, return to a low level INIT signal and then make it become high level, so just can make the cycle repeat,
Infrared survey
The Infrared survey of system is mainly that employing master controller is that AVR control serial AD conversion chip ADS784l completes, ADS784l communicates by 6 line serial line interfaces and AVR, and interface is simple and convenient, a change-over period needs 24 clock period, wherein 8 for Input Control Word, and 16 for reading transformation result; Chip is locked at rising edge clock in all positions of control word, transformation result is shifted out by turn at the negative edge of clock, all immigrations and the data that shift out be all high-order at front, low level rear, it should be noted that, ADS7841 is 12 A/D converters, and its transformation result only has 12, therefore shifting out after 12 results, 4 clocks that also need to make a gift to someone complete whole transfer process, weave into the I/O port of AVR and simulate above-mentioned sequential, complete A/D transfer process;
After A/D converts, need to process the digital signal after conversion, filtering noise, improves output signal-to-noise ratio, adopts the method filtering noise of limit filtration and average value filtering in method, in temperature survey process, 10 A/D conversions of each startup continuously, deposit the result of 10 A/D conversions in array in, in method, first from this array, reject maximal and minmal value, then remaining 8 numbers are got to its average as last A/D transformation result.
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| CN104483043A (en) * | 2014-12-19 | 2015-04-01 | 深圳供电局有限公司 | Stress measurement device and method for knob insulator |
| CN105680368A (en) * | 2016-03-15 | 2016-06-15 | 北京信息科技大学 | Infinite-endurance high-voltage line inspection aircraft |
| CN106441616A (en) * | 2016-08-27 | 2017-02-22 | 成都东创精英科技有限公司 | Water turbine temperature monitoring system based on network technology |
| CN106680371A (en) * | 2016-12-30 | 2017-05-17 | 陕西科技大学 | Electric porcelain body online flaw detection device and electric porcelain body online flaw detection method |
| CN110082655A (en) * | 2019-05-13 | 2019-08-02 | 国网北京市电力公司 | Visualization device detection method and instrument and its application in smart grid |
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