CN107907222B - A kind of thermal infrared imaging electric power facility fault locator and detection method - Google Patents
A kind of thermal infrared imaging electric power facility fault locator and detection method Download PDFInfo
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- CN107907222B CN107907222B CN201711114530.9A CN201711114530A CN107907222B CN 107907222 B CN107907222 B CN 107907222B CN 201711114530 A CN201711114530 A CN 201711114530A CN 107907222 B CN107907222 B CN 107907222B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
Abstract
The invention discloses a kind of thermal infrared imaging electric power facility fault locators, are related to electrical equipment technical field.The thermal infrared imaging electric power facility fault locator, including detector body, display, indicator light, control keyboard, control switch and USB interface, the detector body is equipped with infrared lens, and the inside of the detector body is fixedly connected with grating and pyroscan respectively.The present invention has the advantages that not stop transport, does not contact, the Warm status of equipment is imaged at a distance, quickly and intuitively, obtain the thermography of equipment, faithful representation as Warm status under equipment running status and its Temperature Distribution, electric power facility is able to solve in case of poor contact, dampness insulating properties variation, the failures such as transformer exception, can not timely and effectively to equipment running status well whether the problem of quick and precisely being diagnosed.
Description
Technical field
The present invention relates to electrical equipment technical field, specially a kind of thermal infrared imaging electric power facility fault locator and inspection
Survey method.
Background technique
Thermal imaging system (infrared thermal imagery science and technology) has application at two aspect of the army and the people, most starts gradually to switch to the people originating from military
With.Thermal imaging system is generally in civilian, is mainly used in research and development or industrial detection and plant maintenance, in fire prevention, night vision and peace
It is also widely used in anti-.Thermal infrared imager is the infrared spoke for receiving measured target using infrared detector and optical imaging objective
It penetrates in the reflection to the light-sensitive element of infrared detector of Energy distribution figure, so that Infrared Thermogram is obtained, this thermography and object
The heat distribution field in body surface face is corresponding.Generally thermal infrared imager is exactly to be changed into the invisible infrared energy that object issues
Visible thermal image.The different colours of the upper surface of thermal image represent the different temperatures of testee.
The power circuit of power transmission network and various electric power facilities are in case of poor contact, dampness insulating properties variation, transformer
The failures such as abnormal, the phenomenon that local pyrexia will be generated.The temperature of heat generating spot relative ambient temperature or equipment normal value can be used
It rises to judge thermal defect, and gives to the police circles' temperature rise table for indicating overheat under different load electric current, when tested measuring point is to environment
The temperature rise of temperature is defective greater than being considered as when police circles' temperature rise of defined in table, and determines defect kind by police circles' temperature rise in table
Class, this method is simple, intuitive, practicability is stronger.For example, CN105403312A discloses a kind of power transmission and transforming equipment infrared imaging
Spectrum recognition and analysis method, wherein obtain power transmission and transforming equipment infrared image, according to map obtain certain pixel temperature value, by
The normal phase temperature of the equipment of default, atmospheric reference temperature, obtain temperature rise, the temperature difference and the relative temperature difference of the equipment, and are
System standard value compares, and equipment existing defects are tentatively judged if the threshold value beyond standard setting.But the above-mentioned prior art exists
(1) is had the disadvantage that when infrared detection for high voltage direct current and alternating current circuit, even if identical material, same environmental conditions, by
In kelvin effect and kindred effect, under same load current conditions, the fever of alternating current circuit should be more serious than direct current, and only basis
Load current, as judgment basis, is limited using police circles' temperature rise of unified standard；(2) distinct device, different materials
The heat generation characteristic of material is different, and permission temperature rise at different conditions is answered different, such as when there is solar radiation, can exist
Certain temperature rise is added on detected object, police circles' temperature rise at this moment obviously should with it is different when no solar radiation.Obviously,
It is simultaneously inconvenient, accurate that thermal defect is simply analyzed in this way.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of thermal infrared imaging electric power facility fault locator and detections
Method, solves electric power facility in case of poor contact, dampness insulating properties variation, the failures such as transformer exception, can not be timely
Effectively to equipment running status well whether the problem of quick and precisely being diagnosed.Thermal fault of the present invention to pyrogenicity type equipment
Differentiating can take detected electric power facility attached using the opposite temperature rise determining method of on-the-spot testing under normal duty operating condition
The nearly temperature for operating normally conducting wire, i.e., can be with a certain distance from heat generating spot for there is the place of thermal defect as reference temperature
Place in addition takes the temperature of electric power facility to make reference temperature, and then calculates and be detected electric power facility relative to normal operation conducting wire
Temperature rise, judge whether there is exception.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs: a kind of thermal infrared imaging electric power facility
The first side of fault locator, including detector body, the detector body is hinged with display, the detector by shaft
The second side of body is respectively equipped with indicator light, control keyboard, control switch and USB interface, the third side of the detector body
Equipped with infrared lens；The bottom of detector body is fixedly connected with handle, is equipped with battery in handle；
The inside of the detector body is separately installed with grating, pyroscan, microprocessor and reservoir；
For the grating between infrared lens and pyroscan, the grating is to carve a large amount of put down on the glass sheet
Made of row indentation, indentation is lightproof part, and the smooth part between two indentations can be with light transmission；The grating is in microprocessor
Control under, fine motion translation occurs in fixed position, the imaging angle range of pyroscan is adjusted, stage by stage to tested
Survey each section of progress chart imaging of power line near electric power facility and the tested electric power facility；
The pyroscan has photo-thermal inductor, and the infrared ray that infrared lens focus projects photo-thermal inductor
On, photo-thermal inductor detects the variation of infrared energy and exports electric signal；A/D converter built in pyroscan,
The output end of photo-thermal inductor is connect with A/D converter, and the electric signal that A/D converter sends out photo-thermal inductor is biometrics, so
After be supplied to microprocessor formed infrared chart image；
The microprocessor handles the biometrics signal that pyroscan exports, and generates infrared chart image；
The microprocessor also identifies infrared chart image, calculates each regional temperature number according to the brightness of image of thermal map image each region
According to execution thermometric and temperature rise calculate；
The input terminal of the output end of microprocessor and display is electrically connected, display can show infrared chart image and
The numerical value of opposite temperature rise reading；The output end of microprocessor and the input terminal of indicator light are electrically connected, thus according to opposite temperature rise
The reckoning of reading deposits when the electric power facility for determining detected and carries out flashing alarm by indicator light when abnormal；Control keyboard it is defeated
The input terminal of outlet and microprocessor is electrically connected；The output end of control switch and the input terminal of microprocessor are electrically connected；It is micro-
Processor and the two-way electric connection of reservoir, USB interface and the two-way electric connection of reservoir, the output end of battery are each member
Part provides power supply.
Preferably, the pyroscan is double base passive infrared pyroelectric sensor, and there are two built-in photo-thermal
Inductor parallel imaging；The microprocessor is weighted and averaged enhancing synthesis to two width infrared chart images, forms infrared heat
Figure image.
Preferably, it is also electrically connected with filter on the pyroscan, the output end and photoelectricity of the filter
The input terminal of conversion sensor is electrically connected.
Preferably, fine motion translates the grating stage by stage under control of the microprocessor, controls pyroscan pair
Each local tomography of infrared lens imaged viewing angle range；Wherein, in the first stage, to positioned at infrared lens imaged viewing angle range
The detected electric power facility at center carries out infrared chart imaging；In turn, in other stages, the grating is translated by fine motion, is made
Pyroscan is respectively to each section of execution infrared chart imaging of the power line near detected electric power facility.
Preferably, the microprocessor is using insertion type micro-computer digital signal processing chip circuit, including enforcement division
Part (EU) and bus interface component (BIU).
A kind of detection method using above-mentioned thermal infrared imaging electric power facility fault locator, comprising the following steps:
S1, thermal infrared imaging electric power facility fault locator is laid, is directed at infrared lens at electric power facility detection scene
As the electric power facility of measured target, the mobile fault locator so as to adjust between the fault locator and electric power facility away from
From and observing thermal imaging range by display simultaneously, by moving distance, allow tested electric power facility and setting apart from the electric power
Apply the areas imaging visual field that the conducting wire less than or equal to 5 meters is full of infrared lens；
S2, adjustment infrared lens imaging focal length, make into image focus and are focused on electric power facility as measured target；
S3, setting imaging and temperature-measuring range pass through the control key of fault locator before infrared chart imaging thermometric
Disk sets the image-forming temperature measurement range of fault locator, and image-forming temperature measurement range is made to cover the expected temperature of tested electric power facility
Spend range；
S4, fault locator is steadily placed, to guarantee that the accurate anti-blur of image is made；
S5, the control switch for pressing fault locator, execute infrared chart imaging thermometric and opposite temperature rise calculates.
Preferably, step S5 is specifically included:
S51, stage by stage infrared chart imaging sub-step are translated by the fine motion of microprocessor control grating, are divided to realize
The thermal map image in stage is imaged, and each stage is focused imaging to a part of entire shooting field range；
S52, measured target and reference target cognitive phase obtain the infrared chart image of each stage acquisition；For first
The infrared chart image that stage obtains, the edge detection algorithm based on brightness step or based on colour gamut distribution extract tested electric power
Image-region where facility, as measured target；For the infrared chart image that hereafter each stage obtains, using based on bright
It spends the line target detection algorithm of gradient and extracts image-region where power line, as reference target；
S53, thermometric and temperature rise calculate step: for the measured target identified in step S52, according to its image district
The brightness in domain and the mean value of color value, can correspond to and obtain the temperature of tested electric power facility is T；Take hereafter acquisition of each stage
The highest one section of power line of temperature in each section of power line of infrared chart image, also according to the equal of its brightness and color value
Value, the temperature for measuring this section of power line is reference temperature Ta, then calculates opposite temperature rise Δ T=T-Ta；
S54 judges thermal defect situation according to opposite temperature rise Δ T.
Preferably, step S53 further comprises: climatic condition and measuring distance when according to detection, appropriate adjustment step
The correction factor or amendment temperature value of rapid S53, the temperature and reference temperature of the tested electric power facility measured in step S53,
Multiplied by the correction factor or plus the amendment temperature value, then calculate opposite temperature rise.
Preferably, in step S3, the desired temperature range for being tested electric power facility is the equipment in normal work and failure
The maximum possible range of Temperature Distribution under state, the lower limit value of the image-forming temperature measurement range of fault locator are set as desired temperature model
The 80% of lower limit value is enclosed, the upper limit value of the image-forming temperature measurement range of fault locator is set as desired temperature range upper limit value
120%.
Preferably, step S54 further comprises: if opposite temperature rise is greater than certain threshold value, indicator light executes flashing
Alarm.
(3) beneficial effect
The present invention provides a kind of thermal infrared imaging electric power facility fault locator and detection methods, have following beneficial to effect
Fruit:
(1), fault locator of the invention to electric power facility carry out infrared imaging, with the Warm status of equipment be distributed as according to
According to, using the detection mode of opposite temperature rise, diagnosed whether to equipment running status well, it have do not stop transport, do not contact,
At a distance, the advantages of quickly and intuitively Warm status of equipment being imaged, obtains the thermography of equipment, runs as equipment
The faithful representation of Warm status and its Temperature Distribution under state is able to solve electric power facility and insulate in case of poor contact, dampness
The failures such as property variation, transformer exception, can not timely and effectively to equipment running status well whether quick and precisely diagnosed
The problem of.Make user far from danger, will not invade and harass or influence target, quickly generate thermal map picture, object can be compared not
With the temperature in region, overall goals can be observed using image, heat distribution is visualized and can be carried out post analysis.
Detailed description of the invention
Fig. 1 is front view of the invention；
Fig. 2 is rearview of the invention；
Fig. 3 is top view of the invention；
Fig. 4 is schematic diagram of internal structure of the invention；
Fig. 5 is the principle of the present invention schematic diagram；
Fig. 6 is control system figure of the invention；
Fig. 7 is measured target and its neighbouring electric force lines distribution schematic diagram of the invention.
In figure: 1 detector body, 2 displays, 3 indicator lights, 4 control keyboards, 5 control switches, 6USB interface, 7 infrared mirrors
Head, 8 gratings, 9 pyroscans, 10 microprocessors, 11 reservoirs, 12 handles, 13 batteries, 14 rubber films, 15 links,
16 photoelectric conversion sensors, 17 filters.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Examples of the embodiments are shown in the accompanying drawings, and in which the same or similar labels are throughly indicated identical or classes
As element or element with the same or similar functions.The embodiments described below with reference to the accompanying drawings are exemplary, purport
It is being used to explain the present invention, and is being not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
Fig. 1-6 is please referred to, the present invention provides a kind of technical solution: a kind of thermal infrared imaging electric power facility fault locator,
Including detector body 1, the first side of detector body 1 is hinged with display 2 by shaft, and display 2 (display) is generally also
Liquid crystal display LCD etc. can be used in referred to as monitor.；The second side of detector body 1 is respectively equipped with indicator light 3, control key
Disk 4, control switch 5 and USB interface 6.The bottom of detector body 1 is fixedly connected with handle 12, convenient for holding, is equipped in handle 12
Battery 13, the outer surface of handle 12 is arranged with rubber film 14, and the outer surface of rubber film 14 is equipped with equally distributed anti-
Sliding salient point, prevents rubber sleeve, the bottom of handle 12 is fixedly connected with link 15, conveniently hangs up.
The third side of detector body 1 is equipped with infrared lens 7, and common lens on the market can be accomplished difference at present
On the light-ray condensing to same plane of 250nm or so wavelength, i.e. light within the scope of 430-650nm or 650-900nm can gather
Coke success, shows clearly image, this is why common lens tune on daytime is clear, night vision obscures or night vision tune
Reason clear, that daytime obscures, infrared lens 7 can accomplish that the light 430-900nm even more long wave segment limit is all assembled
Onto same plane, so regardless of daytime or night vision are all that clearly, infrared lens 7 play reception and convergence testee transmitting
Infra-red radiation effect.
The inside of detector body 1 is fixedly connected with grating 8 and pyroscan 9 respectively, and pyroscan 9 is infrared
In the focus of camera lens 7.Pyroscan 9 includes filter 17, interfering for filtering out major part other than infrared band
Radiated electromagnetic wave, be able to ascend pyroscan 9 incude heat radiation when data precision, the output end of the filter 17 with it is red
The input terminal of the photo-thermal inductor of outer line detector 9 is electrically connected.There are two photo-thermal inductors for the tool of pyroscan 9, infrared
The infrared ray that camera lens 7 focuses projects on photo-thermal inductor, and photo-thermal inductor can detect the variation of infrared energy, and
Export electric signal, the photo-thermal inductor of pyroscan 9 is photoelectric conversion sensor 16, photoelectric conversion sensor 16 it is effective
Service band is infrared band, and infrared emanation signal is become electric signal, so referred to as photo-thermal inductor.Infra-red detection
The output end of A/D converter built in device 9, the photoelectric conversion sensor 16 is connect with A/D converter, and A/D converter is by photo-thermal sense
The electric signal for answering device to send out is biometrics, is provided to microprocessor 10 and forms infrared chart image；By to photo-thermal inductor
Signal carry out biometrics processing, formation can eliminate transition and interference of electromagnetic wave of signal etc..Pyroscan 9 uses
Double base passive infrared pyroelectric sensor, the photo-thermal inductor parallel imaging built in double base i.e. two, then it is right by microprocessor 10
Two width infrared chart images are weighted and averaged enhancing synthesis, to be obviously improved the details effect of infrared chart imaging.
Grating 8 is between infrared lens 7 and pyroscan 9.It is made of a large amount of wide equidistant parallel slits
Optical device be known as grating 8, grating 8 is made of to carve a large amount of parallel scores on the glass sheet, and indentation is lightproof part, two
Smooth part between indentation can be equivalent to a slit with light transmission, and grating 8 is carved with 8000 to 10000 quarters in 1cm width
Trace, grating 8 are the transmission grating using transmitted light diffraction principle.Grating 8 can occur fine motion in fixed position and translate, and light
The areas imaging that the small translation of grid 8 will lead to pyroscan 9 varies widely, therefore grating 8 is infrared for controlling
The imaging angle of the photo-thermal inductor of line detector 9.Especially for linear facility common in electric power facility, such as electric power
Line, power line L as shown in Figure 7, if it is desired to infrared detection imaging is carried out for L1, L2, L3 segmentation, then only needing by micro-
Processor 10 controls grating 8 and carries out fine motion translation, it can control will be converged each from L1, L2, L3 by infrared lens 7 respectively
The infrared signal of section is projeced into pyroscan 9, realizes that the segmentation to power line L is imaged.The present invention takes detected electric power
Facility nearby operates normally the temperature of conducting wire as reference temperature, therefore several to detected electric power facility and near it
Section lead realizes that infrared thermal imaging detects respectively.It is more troublesome if mobile seat in the plane detection in this detection.Therefore, originally
The infrared lens 7 of invention use wide-angle lens, can acquire infrared signal with wide area；And grating 8 is under the control of microprocessor 10
Fine motion translates stage by stage, controls the imaging angle range of pyroscan 9.Firstly, in the first stage, to tested in Fig. 7
It surveys electric power facility M and carries out infrared chart imaging；In turn, second to fourth stage, grating 8 is translated by fine motion, makes infrared ray
Detector 9 respectively to each section of execution infrared chart imaging of power line L1, L2, L3 near M.It is obtained from infrared chart image
It is detected the thermometric of electric power facility M with each section of power line L1, L2, L3, to calculate opposite temperature rise.Chart imaging makes stage by stage
Do not need mobile seat in the plane, do not need to shoot repeatedly yet, single operation can complete the thermal map of measured target and reference target at
As measurement；Chart imaging and subsequent thermometric analysis are separately carried out to measured target and reference target, are conducive in thermal map image
The middle accuracy for carrying out target area identification and extracting, avoids the mutual crosstalk in imaging, and then ensure that the accuracy of thermometric.
The microprocessor 10 and reservoir 11 being equipped in detector body 1.Microprocessor 10 is using insertion type micro-computer number
Signal processing chip circuit has perfect temperature-compensating, and exclusive false alarm prevention algorithm, low-power consumption, performance is stable, anti-interference
By force.Microprocessor 10 can be divided into two parts, and a part is execution unit (EU), that is, the part executed instruction；Another part is
Bus interface component (BIU) is executed from the operation of memory instruction fetch, after microprocessor is divided into EU and BIU, can make instruction fetch and
The operation overlapping executed instruction carries out, and there is a register file in the part EU, and the register group by 8 16 is at can be used to store
Data, index and stack pointer；The arithmetical operation logic unit (ALU) of the part EU executes arithmetical operation and logical operation, mark
Register deposits the condition of these operating results.Bus interface component BIU also has a register file, wherein CS, DS, SS and ES
It is the segmentation register of memory space segmentation, IP is instruction pointer, and internal communication register is also the deposit of temporary storage data
Device, instruction queue be the instruction stream storage fetched in advance, bus interface component BIU there are one address adder,
Segmentation register value is added with bias, is obtained 20 physical address, data and address and is passed through bus control logic and periphery
Embedded system component be associated.When transmitting data outside processor and piece, it once can transmit 16 bits.Microprocessor
At the 10 biometrics signals that can be exported to the pyroscan 9 using double base passive infrared pyroelectric sensor structure
Reason generates infrared chart image.Microprocessor 10 also identifies infrared chart image, and the image according to thermal map image each region is bright
Degree calculates each regional temperature data, executes thermometric and temperature rise calculates.
The output end of microprocessor 10 and the input terminal of display 2 are electrically connected, and display 2 can show infrared chart image
And the numerical value of the opposite temperature rise reading for each extracted region of infrared chart image, so as to for the engineering maintenance for operating this equipment
Personnel intuitively check.The output end of microprocessor 10 and the input terminal of indicator light 3 are electrically connected, thus according to infrared chart figure
Reckoning as each region with respect to temperature rise reading is deposited when the electric power facility for determining detected and is dodged when abnormal by indicator light 3
Bright alarm.The output end of control keyboard 4 and the input terminal of microprocessor 10 are electrically connected.The output end and Wei Chu of control switch 5
The input terminal for managing device 10 is electrically connected.Microprocessor 10 and the two-way electric connection of reservoir 11, USB interface 6 with reservoir 11 pairs
Electrotropism connection.The output end of battery 13 provides power supply for each element of this detector.
The present invention provides a kind of detection method of thermal infrared imaging electric power facility fault locator, including following step in turn
It is rapid:
S1, it lays thermal infrared imaging electric power facility fault locator: being directed at infrared lens 7 at electric power facility detection scene
As the electric power facility of measured target, the mobile fault locator so as to adjust between the fault locator and electric power facility away from
From and observing thermal imaging range by display 2 simultaneously, by moving distance, allow tested electric power facility and apart from the electric power
Conducting wire of the facility less than or equal to 5 meters is full of the areas imaging visual field of infrared lens 7.If fault locator and tested electric power facility
Apart from too small, will lead to can not be focused to clear image, or can not take in electric power facility nearby as the electrical lead referred to；
On the contrary, causing target too small, it is difficult to measure true temperature if fault locator is excessive at a distance from electric power facility.Therefore
By moving repeatedly in this step, good moderate distance is kept, data reported as precisely as possible can be obtained.
S2, adjustment 7 imaging focal length of infrared lens, make into image focus and are focused on electric power facility as measured target.It is logical
It is over-focusing, prevent the overheat of background or the reflections affect of supercooling over or around target from arriving the accuracy of target measurement, reduction or
Person eliminates reflections affect；Because when the preservation of infrared chart image finishes focal length can not be changed again just to eliminate other mixed and disorderly heat
Reflection, therefore Focussing is carried out between infrared chart imaging.
S3, setting imaging and temperature-measuring range: before infrared chart imaging thermometric, pass through the control keyboard of fault locator
4, the image-forming temperature measurement range of fault locator is set, temperature-measuring range is made to cover the desired temperature model of tested electric power facility
It encloses.The desired temperature range of tested electric power facility is that the equipment is working normally the maximum possible with Temperature Distribution under malfunction
20-35 degrees Celsius of temperature under range, such as tested electric power facility normal work, its temperature if a failure occurs can reach
50 degrees Celsius, then desired temperature range is 20-50 degrees Celsius.The image-forming temperature measurement range of fault locator can be then adjusted to
16-60 degrees Celsius, to cover the desired temperature range.The image-forming temperature measurement range of fault locator also should not exceed desired temperature model
It encloses too much, otherwise can introduce unnecessary interference for temperature measuring and imaging, should be allowed to meet the desired temperature model of measured target as far as possible
It encloses, just can guarantee to obtain optimum picture quality；The present invention is through validation trial, by the image-forming temperature measurement range of fault locator
Lower limit value is set as the 80% of desired temperature range lower limit value, and the upper limit value of the image-forming temperature measurement range of fault locator is set as
The 120% of desired temperature range upper limit value, actual imaging thermometric effect are preferable.
S4, fault locator is steadily placed, to guarantee that the accurate anti-blur of image is made.Manually use fault locator
When, it needs to place supporter under arm and keeps balancing to consolidate.Preferably instrument is placed in firm plane, or with three feet
Frame support, so that infrared chart imaging is more stable.
S5, infrared chart imaging thermometric and opposite temperature rise calculating are executed: after completing above steps, presses failure inspection
The control switch 5 for surveying instrument makes the working condition that detector body 1 starts infrared chart imaging thermometric and opposite temperature rise calculates.The work
Include following sub-step as state:
S51, stage by stage infrared chart imaging sub-step receive the infrared energy in tested range using infrared lens 7
Amount distribution figure, on the light-sensitive element for projecting pyroscan 9, to obtain infrared chart image, this thermography with
The heat distribution field of body surface is corresponding, and the invisible infrared energy that object issues exactly is changed into visible thermal image, heat
The different colours of the upper surface of image represent the different temperatures of testee.As it was noted above, controlling grating 8 by microprocessor 10
Fine motion translation, to realize thermal map image imaging stage by stage, each stage to a part of entire shooting field range into
Line focusing imaging.Such as in the detection of Fig. 7, in the first stage to the detected electric power facility most intermediate positioned at shooting field range
M carries out infrared chart imaging；In turn, second to fourth stage, grating 8 is translated by fine motion, makes pyroscan 9 successively
To power line L1, L2 near being located on the right side of M and it is located at power line L3 execution infrared chart imaging near the left side M.
S52, measured target and reference target cognitive phase, the infrared chart figure that the first to fourth each stage that obtained obtains
Picture；For the infrared chart image that the first stage obtains, wherein being detected electric power facility M is presented that brightness is higher, face because of fever
Colour cast can be extracted to the image-region in red domain using the edge detection algorithm based on brightness step or based on colour gamut distribution
Image-region where M, as measured target.For the image-region where neighbouring power line L1, L2 and L3, power line place
Region can use the line target detection algorithm based on brightness step and extract power line because the higher threadiness of brightness is presented in fever
Place image-region, as reference target.
S53, thermometric and temperature rise calculate step: by calibration, can by the brightness of pixel in thermal map image, color value with
The temperature of actual object is mapped；Therefore, for the measured target identified in step S52, according to its image-region
Brightness and color value mean value, can correspond to obtain be measured electric power facility M temperature be T；It takes normal near measurand M
Highest one section of temperature, also according to the mean value of its brightness and color value, measures temperature in power line L1, L2, L3 of operation
For reference temperature Ta, then opposite temperature rise Δ T=T-Ta is calculated.
Step S54, thermal defect situation is judged according to opposite temperature rise Δ T；If opposite temperature rise is greater than certain threshold value, recognize
It is M there are malfunction, indicator light 3 can execute flashing alarm.This detection method based on opposite temperature rise can be eliminated too
The influence that temperature rise is added caused by sun radiation, simultaneously as same tropism, the parameters such as detecting distance, environment temperature, humidity, wind speed
Inaccuracy bring error also reduce.
It is appropriate to adjust according to climatic condition (wind-force, wind speed, environment temperature, mist, snow) and measuring distance at that time when detection
The correction factor or amendment temperature value of the rapid S53 of synchronizing, specific method: in test site, first in short distance thermometer measure electricity
The temperature of power facility certain point, then at actual range when to practical thermometric, with fault locator measurement electric power facility
Temperature, according to the temperature difference that two sides measure, the correction factor or amendment temperature value of setting；Then, the temperature measured in step S53
Degree multiplied by the correction factor or plus the amendment temperature value, then calculates opposite temperature rise.
The correlation module being related in this article is hardware system module or for computer software programs in the prior art
Or the functional module that agreement is combined with hardware, computer software programs or agreement involved by the functional module itself
The technology being known to the skilled person is not the improvements of this system；This system is improved between each module
Interaction relationship or connection relationship as improve the whole construction of system, to be solved to solve this system
Relevant art problem.
In conclusion fault locator of the invention carries out infrared imaging to electric power facility, it is distributed with the Warm status of equipment
It for foundation, is diagnosed whether to equipment running status well, it, which has, does not stop transport, does not contact, at a distance, quickly and intuitively
The advantages of Warm status of equipment is imaged obtains the thermography of equipment, as Warm status under equipment running status and its temperature
The faithful representation for spending distribution is able to solve electric power facility in case of poor contact, dampness insulating properties variation, transformer exception etc.
Failure, can not timely and effectively to equipment running status well whether the problem of quick and precisely being diagnosed.Do not need contact to
Target is surveyed, makes user far from danger, will not invade and harass or influence target, quickly generate thermal map picture, object can be compared not
With the temperature in region, overall goals can be observed using image, heat distribution is visualized and can be carried out post analysis, are rung in real time
It answers, fast moving objects capture, the picture catching of high frequency temperature change, and improves the detection accuracy of fault locator, be easy to
It promotes the use of.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (10)
1. the first side of a kind of thermal infrared imaging electric power facility fault locator, including detector body, the detector body is logical
Cross shaft and be hinged with display, the second side of the detector body be respectively equipped with indicator light, control keyboard, control switch and
The third side of USB interface, the detector body is equipped with infrared lens；The bottom of detector body is fixedly connected with handle, handle
It is interior to be equipped with battery；It is characterized by:
The inside of the detector body is separately installed with grating, pyroscan, microprocessor and reservoir；
For the grating between infrared lens and pyroscan, the grating is to carve a large amount of parallel quarters on the glass sheet
Made of trace, indentation is lightproof part, and the smooth part between two indentations can be with light transmission；Control of the grating in microprocessor
Under system, fine motion translation occurs in fixed position, the imaging angle range of pyroscan is adjusted, stage by stage to detected electricity
Each section of progress chart imaging of power line near power facility and the tested electric power facility；
The pyroscan has photo-thermal inductor, and the infrared ray that infrared lens focus projects on photo-thermal inductor, light
Thermal sensor detects the variation of infrared energy and exports electric signal；A/D converter built in pyroscan, photo-thermal sense
The output end of device is answered to connect with A/D converter, the electric signal that A/D converter sends out photo-thermal inductor is biometrics, then provides
Infrared chart image is formed to microprocessor；
The microprocessor handles the biometrics signal that pyroscan exports, and generates infrared chart image；It is described
Microprocessor also identifies infrared chart image, calculates each regional temperature data according to the brightness of image of thermal map image each region,
It executes thermometric and temperature rise calculates；
The input terminal of the output end of microprocessor and display is electrically connected, and display can show infrared chart image and opposite
The numerical value of temperature rise reading；The output end of microprocessor and the input terminal of indicator light are electrically connected, to be read according to opposite temperature rise
Reckoning, deposited when the electric power facility for determining detected and flashing alarm carried out by indicator light when abnormal；The output end of control keyboard
It is electrically connected with the input terminal of microprocessor；The output end of control switch and the input terminal of microprocessor are electrically connected；Micro process
Device and the two-way electric connection of reservoir, USB interface and the two-way electric connection of reservoir, the output end of battery are that each element mentions
For power supply.
2. thermal infrared imaging electric power facility fault locator according to claim 1, which is characterized in that the infrared ray is visited
Survey device is double base passive infrared pyroelectric sensor, and there are two built-in photo-thermal inductor parallel imagings；The microprocessor pair
Two width infrared chart images are weighted and averaged enhancing synthesis, form infrared chart image.
3. thermal infrared imaging electric power facility fault locator according to claim 2, which is characterized in that the infrared ray is visited
It surveys on device and is also electrically connected with filter, the output end of the filter and the input terminal of photoelectric conversion sensor are electrically connected.
4. thermal infrared imaging electric power facility fault locator according to claim 3, which is characterized in that the grating is micro-
Fine motion translates stage by stage under the control of processor, each part of the control pyroscan to infrared lens imaged viewing angle range
Imaging；Wherein, in the first stage, infrared heat is carried out to the detected electric power facility for being located at infrared lens imaged viewing angle range center
Figure imaging；In turn, in other stages, the grating is translated by fine motion, sets pyroscan to detected electric power respectively
Apply neighbouring each section of execution infrared chart imaging of power line.
5. thermal infrared imaging electric power facility fault locator according to claim 4, which is characterized in that the microprocessor
Using insertion type micro-computer digital signal processing chip circuit, including execution unit (EU) and bus interface component (BIU).
6. a kind of inspection using thermal infrared imaging electric power facility fault locator described in any one of the claims 1-5
Survey method, which comprises the following steps:
S1, thermal infrared imaging electric power facility fault locator is laid, so that infrared lens is directed at conduct at electric power facility detection scene
The electric power facility of measured target, the mobile fault locator so as to adjust the distance between the fault locator and electric power facility,
And thermal imaging range is observed by display simultaneously, by moving distance, allow tested electric power facility and apart from the electric power facility
Conducting wire less than or equal to 5 meters is full of the areas imaging visual field of infrared lens；
S2, adjustment infrared lens imaging focal length, make into image focus and are focused on electric power facility as measured target；
S3, setting imaging and temperature-measuring range, it is right by the control keyboard of fault locator before infrared chart imaging thermometric
The image-forming temperature measurement range of fault locator is set, and image-forming temperature measurement range is made to cover the desired temperature model of tested electric power facility
It encloses；
S4, fault locator is steadily placed, to guarantee that the accurate anti-blur of image is made；
S5, the control switch for pressing fault locator, execute infrared chart imaging thermometric and opposite temperature rise calculates.
7. detection method according to claim 6, which is characterized in that step S5 is specifically included:
S51, stage by stage infrared chart imaging sub-step are translated by the fine motion of microprocessor control grating, to realize stage by stage
The imaging of thermal map image, each stage is focused imaging to a part of entire shooting field range；
S52, measured target and reference target cognitive phase obtain the infrared chart image of each stage acquisition；For the first stage
The infrared chart image of acquisition, the edge detection algorithm based on brightness step or based on colour gamut distribution extract tested electric power facility
The image-region at place, as measured target；For the infrared chart image that hereafter each stage obtains, using based on brightness ladder
The line target detection algorithm of degree and extract image-region where power line, as reference target；
S53, thermometric and temperature rise calculate step: for the measured target identified in step S52, according to its image-region
The mean value of brightness and color value, can correspond to and obtain the temperature of tested electric power facility is T；Take the electric power that hereafter each stage obtains
The highest one section of power line of temperature in each section of line of infrared chart image is surveyed also according to the mean value of its brightness and color value
The temperature for obtaining this section of power line is reference temperature Ta, then calculates opposite temperature rise Δ T=T-Ta；
S54 judges thermal defect situation according to opposite temperature rise Δ T.
8. detection method according to claim 7, which is characterized in that step S53 further comprises: gas when according to detection
Situation and measuring distance are waited, the correction factor or amendment temperature value of appropriate adjustment step S53, what is measured in step S53 is tested
The temperature and reference temperature of electric power facility multiplied by the correction factor or plus the amendment temperature value, then calculate relatively warm
It rises.
9. detection method according to claim 8, which is characterized in that in step S3, be tested the desired temperature of electric power facility
Range is that the tested electric power facility is working normally the maximum possible range with Temperature Distribution under malfunction, fault locator
The lower limit value of image-forming temperature measurement range is set as the 80% of desired temperature range lower limit value, by the image-forming temperature measurement range of fault locator
Upper limit value be set as the 120% of desired temperature range upper limit value.
10. detection method according to claim 9, which is characterized in that step S54 further comprises: if opposite temperature rise
Greater than certain threshold value, then indicator light executes flashing alarm.
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| CN110658864A (en) * | 2019-09-03 | 2020-01-07 | 深圳供电局有限公司 | Power equipment monitoring method and device and computer readable storage medium |
| CN110530432A (en) * | 2019-09-30 | 2019-12-03 | 国网山东省电力公司电力科学研究院 | A kind of grid equipment electrification detection system, thermal infrared imager and method |
| CN110793639A (en) * | 2019-11-18 | 2020-02-14 | 北京和普威视科技股份有限公司 | Method and system for judging health state of infrared thermal imaging machine core |
| CN111208165A (en) * | 2020-03-06 | 2020-05-29 | 河北新天科创新能源技术有限公司 | Device and method for detecting fan blade damage based on infrared imaging technology |
| CN113551775B (en) * | 2021-06-23 | 2022-10-04 | 国网福建省电力有限公司 | Equipment fault on-line monitoring alarm method and system based on infrared thermal imaging |
| CN116106705B (en) * | 2023-04-12 | 2023-07-11 | 中国空气动力研究与发展中心低速空气动力研究所 | Plasma exciter real-time monitoring device and method for unmanned aerial vehicle flight verification |
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