CN110243479A - A kind of method and system improving the online fault detection accuracy rate of overhead line structures - Google Patents
A kind of method and system improving the online fault detection accuracy rate of overhead line structures Download PDFInfo
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- CN110243479A CN110243479A CN201910537871.XA CN201910537871A CN110243479A CN 110243479 A CN110243479 A CN 110243479A CN 201910537871 A CN201910537871 A CN 201910537871A CN 110243479 A CN110243479 A CN 110243479A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 230000007547 defect Effects 0.000 claims description 28
- 230000007812 deficiency Effects 0.000 claims description 24
- 239000002510 pyrogen Substances 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000001757 thermogravimetry curve Methods 0.000 claims description 9
- 230000015556 catabolic process Effects 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 6
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- 208000037656 Respiratory Sounds Diseases 0.000 claims description 3
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- 230000004888 barrier function Effects 0.000 claims 1
- 235000013399 edible fruits Nutrition 0.000 claims 1
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- 230000036541 health Effects 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 6
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- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000009472 formulation Methods 0.000 abstract description 2
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- 238000003745 diagnosis Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
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- 230000009429 distress Effects 0.000 description 1
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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
- G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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Abstract
Present disclose provides a kind of method and system for improving the online fault detection accuracy rate of overhead line structures, it is combined by infrared measurement of temperature and ultrasonic detection technology, the incipient fault of discovery overhead line structures in time, and the health and fitness information of each overhead transmission line, each substation is collected by on-line checking, science establishes information account, administrative staff are helped to qualitative, quantitative to grasp the health condition of equipment operation in time, while the information of complete and accurate makes the formulation maintenance plan of operation maintenance personnel science, eliminates safe hidden trouble early.
Description
Technical field
This disclosure relates to overhead line structures fault detection technique field more particularly to a kind of online failure inspection of raising overhead line structures
Survey the method and system of accuracy rate.
Background technique
The statement of this part is only to refer to background technique relevant to the disclosure, not necessarily constitutes the prior art.
It is continuously improved with the continuous social and economic development with living standards of the people, the reliability requirement of distribution system is got over
Come higher, thus the operation conditions for grasping distribution line and equipment in time is particularly significant.With regard to known to inventor, at present to route lever
The fault detection of tower, which uses original regular manual patrol and records, forms archives, inefficiency, while only by visually observing,
Potential risk can not be detected in time, manpower must be started to search, time-consuming, and effect is poor, is unfavorable for route lever until hidden danger is broken out
The daily maintenance of tower.
Summary of the invention
In order to solve the deficiencies in the prior art, present disclose provides a kind of online fault detection accuracys rate of raising overhead line structures
Method, the disclosure combined by infrared measurement of temperature and ultrasonic detection technology, find the incipient fault of overhead line structures in time, and
The health and fitness information of each overhead transmission line, each substation is collected by on-line checking, science is established information account, helped to qualitative, quantitative
Administrative staff grasp the health condition of equipment operation in time, while the information of complete and accurate overhauls the formulation of operation maintenance personnel science
Plan, eliminates safe hidden trouble early.
To achieve the goals above, the technical solution of the disclosure is as follows:
As one or more embodiments, a method of improving the online fault detection accuracy rate of overhead line structures, comprising:
The fault type judgment threshold of each equipment is obtained according to history infrared detections, and is examined according to history ultrasonic wave
It surveys result and obtains the defect level judgment threshold of each equipment；
Acquire the infrared measurement of temperature data of each equipment, carry out signal conversion, according to the difference of each device type, respectively with difference
Fault type judgment threshold be compared to carry out equipment fault type judgement；
The ultrasonic test data for acquiring each equipment is converted to ultrasonic wave waveform and sound after being carried out amplification and filtering
Frequency waveform, and be compared with corresponding defect level judgment threshold, determine equipment deficiency degree；
Bonding apparatus fault type judging result and equipment deficiency degree provide corresponding treatment advice.
It is further, described that surface temperature determining method is included according to the progress equipment fault type judgement of infrared measurement of temperature data,
External thermal fault of the surface temperature determining method for equipment judges, specifically includes the surface temperature value of measuring device, and will
Compared with the temperature of relevant device and temperature rise limit standard, ambient temperature and load when in combination with measurement are sentenced for it
Whether disconnected equipment breaks down.
It is further, described that relative temperature difference determining method is included according to the progress equipment fault type judgement of infrared measurement of temperature data,
The relative temperature difference determining method is used for the breakdown judge of current caused hot equipment, specifically includes controller switching equipment situation is same or similar
Two corresponding measuring points carry out temperature and subtract each other, be to judge equipment with the wherein biggish ratio of temperature rise amplitude according to resulting difference
No failure.
Further, described that similar comparison method is included according to the progress equipment fault type judgement of infrared measurement of temperature data, it is described
Similar comparison method is used for the breakdown judge of same electric loop, when three-phase current is symmetrical identical with three-phase equipment, compares three-phase
Whether the temperature rise value of current caused hot type equipment corresponding position breaks down judging equipment or biphase current is symmetrical and two-phase equipment
When identical, compare the temperature rise value of biphase current pyrogenicity type equipment corresponding position to judge whether equipment breaks down.
It further, can be by itself and same circuit if the similar comparison method further includes three-phase equipment while exception occurs
Same category of device compares；If when three-phase load electric current asymmetry, being judged as that load current or operating voltage are abnormal.
Further, the similar comparison method further includes the voltage pyrogenicity type equipment for equivalent specifications, can be by corresponding
Whether the diversity judgement equipment of point temperature rise value breaks down, if voltage pyrogenicity type equipment existing defects, can use temperature rise or similar
The judgment basis of the temperature difference is allowed to determine.
Further, described that Thermogram analytic approach, institute are included according to the progress equipment fault type judgement of infrared measurement of temperature data
Thermogram analytic approach is stated for same category of device breakdown judge, is specifically included same category of device under normal condition and abnormality
Thermogram is drawn out, and compares their difference, to judge whether equipment is normal.
Further, the equipment fault type include crackle, erosion, carbonization phenomenon, breakdown trace, installation it is bad, rotten
Erosion, surface contamination, tarnish, sur-face peeling and tree mill conducting wire.
Further, described to determine that equipment deficiency degree specifically includes the ultrasound according to conversion according to ultrasonic test data
Wave waveform and audio volume control judge the degree of discharge of equipment, judge equipment deficiency degree according to equipment degree of discharge.
Further, the equipment deficiency degree specifically includes, and when equipment discharge off, defect level is 0~10；When
When equipment is slightly discharged, depth of defect is 10~20；When the electric discharge of equipment moderate, defect level is 20~30；Work as equipment
When serious electric discharge, defect level is 30 or more.
A kind of system improving the online fault detection accuracy rate of overhead line structures, comprising:
Threshold determination module: for obtaining the fault type judgment threshold of each equipment according to history infrared detections, with
And the defect level judgment threshold of each equipment is obtained according to history ultrasound examination result；
Equipment fault type judging module: for acquiring the infrared measurement of temperature data of each equipment, signal conversion is carried out, according to each
The difference of device type is compared respectively to carry out equipment fault type judgement from different fault type judgment thresholds；
Equipment deficiency degree determining module: for acquiring the ultrasonic test data of each equipment, amplification and filter are carried out
After wave, ultrasonic wave waveform and audio volume control are converted to, and be compared with corresponding defect level judgment threshold, determine that equipment lacks
The degree of falling into；
Output module: corresponding processing is provided for bonding apparatus fault type judging result and equipment deficiency degree and is built
View.
Compared with prior art, the beneficial effect of the disclosure is:
1) disclosure provides good detection means by infrared temperature-test technology for running distribution line, will be by
Measurement equipment surface temperature heterogeneity phantom is exported in a manner of vision signal, and is shown by thermal image, and work people can be made
Member grasps equipment operation condition in real time, improves staff's discovery and judges the ability of equipment deficiency, especially distribution line, protects
Hinder the continuity and reliability of user power utilization.
2) disclosure by ultrasonic wave monitor on-line periodically to the force device equipment of overhead transmission line and outdoor substation into
The diagnosis of row ultrasonic wave on-line checking improves aerial to establish the healthy handbook of overhead transmission line and the healthy handbook of outdoor substation
The standardization of route and the health and fitness information account of substation, fining degree, are the on-line checking of General Promotion company transport inspection department
The data supporting of science is provided with required level of service.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the flow chart of the raising online fault detection accuracy rate of overhead line structures of a certain embodiment of the disclosure.
Specific embodiment
The disclosure is described further with specific embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In the disclosure, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this public affairs
The relative for opening each component or component structure relationship and determination, not refers in particular to either component or element in the disclosure, cannot understand
For the limitation to the disclosure.
In the disclosure, term such as " affixed ", " connected ", " connection " be shall be understood in a broad sense, and indicate may be a fixed connection,
It is also possible to be integrally connected or is detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the disclosure as the case may be,
It should not be understood as the limitation to the disclosure.
As one or more embodiments, as shown in Figure 1, a kind of side for improving the online fault detection accuracy rate of overhead line structures
Method, comprising:
The fault type judgment threshold of each equipment is obtained according to history infrared detections, and is examined according to history ultrasonic wave
It surveys result and obtains the defect level judgment threshold of each equipment；
Acquire the infrared measurement of temperature data of each equipment, carry out signal conversion, according to the difference of each device type, respectively with difference
Fault type judgment threshold be compared to carry out equipment fault type judgement；
The ultrasonic test data for acquiring each equipment is converted to ultrasonic wave waveform and sound after being carried out amplification and filtering
Frequency waveform, and be compared with corresponding defect level judgment threshold, determine equipment deficiency degree；
Bonding apparatus fault type judging result and equipment deficiency degree provide corresponding treatment advice.
It is described to be judged according to the progress equipment fault type judgement of infrared measurement of temperature data including surface temperature in specific implementation
Method, relative temperature difference determining method, similar comparison method and Thermogram analytic approach, are below specifically introduced each method:
1, surface temperature determining method
Some equipment cause to generate heat due to current caused hot type and galvanomagnetic-effect, by the equipment surface temperature value measured,
By itself and the temperature of high-tension switch gear, the control unit of equipment, material or dielectric and the standard of temperature rise limit, in conjunction with
Environmental aspect and load around equipment judge whether equipment breaks down.
The advantages of this method, is simple, practical；The disadvantage is that just holding when load is smaller, fault point fever is unobvious
It easily leads to and fails to judge, judges by accident.Thus, surface temperature determining method is usually applicable only to the judgement of simple external thermal fault.
2, relative temperature difference determining method
Relative temperature difference determining method refers to controller switching equipment situation, such as the attribute of equipment physics, environment temperature, surface appearance
It carries out temperature with two same or similar corresponding measuring points of parameters such as load currents to subtract each other, according to resulting difference and wherein temperature rise
Amplitude biggish ratio judges whether equipment breaks down.Relative temperature difference determining method is generally used for the failure of current caused hot equipment
Judgement, advantage are that the influence of load and environment temperature to infrared diagnostics result can be excluded.
3, similar comparison method
In same electric loop, when three-phase current is symmetrical identical with three-phase equipment, compares three-phase current pyrogenicity type and set
The temperature rise value of standby corresponding position, so that it may when judging whether equipment breaks down or biphase current is symmetrical identical with two-phase equipment,
Compare the temperature rise value of biphase current pyrogenicity type equipment corresponding position to judge whether equipment breaks down.
If there is exception simultaneously in three-phase equipment, can by its with compared with the same category of device in circuit.When three-phase load electric current
When asymmetric, it is considered as the influence of load current and operating voltage.For the voltage pyrogenicity type equipment of equivalent specifications, phase can be passed through
Whether the diversity judgement equipment that temperature rise value should be put breaks down.If when voltage pyrogenicity type equipment existing defects, can with temperature rise or
The similar judgment basis for allowing the temperature difference determines.Under normal conditions, when the similar temperature difference, which is more than, allows the 30% of temperature rise value, so that it may
It is set to significant deficiency.
4, Thermogram analytic approach
Thermogram of the same category of device under normal condition and abnormality is drawn out, and compares their difference, from
And judge whether equipment is normal.
The equipment fault type includes crackle, erosion, carbonization phenomenon, breakdown trace, installation is bad, burn into surface is dirty
Dye, matt, sur-face peeling and tree mill conducting wire.
It is described according to ultrasonic test data determine equipment deficiency degree specifically include according to the ultrasonic wave waveform of conversion and
Audio volume control judges the degree of discharge of equipment, judges equipment deficiency degree according to equipment degree of discharge.
Based on the analysis to equipment spectrogram, shelf depreciation degree is divided into slight electric discharge, moderate electric discharge and serious electric discharge.It is super
The problem of diagnosis of sound wave on-line checking is found electrical equipment adopts problem electrical equipment in conjunction with the treatment measures in historical data
Different maintenance measures is taken, measured value is with reference to as shown in table 1.
Slight electric discharge: slight electric discharge is in the initial stage of shelf depreciation, and discharge time is fewer, and discharge capacity is faint, benefit
It can't detect the discharge signal of shelf depreciation with ultrasonic sensor.In shelf depreciation two-dimensional histogram at this time, amplitude of discharging
Show approximate triangle with corresponding distribution with discharge time, positive-negative half-cycle is single-peak structure, respectively with 50 ° and
220 ° are symmetrical centre, are less than negative half period for positive half cycle the case where discharge time, it is then opposite that electric discharge amplitude obtains situation.
Moderate electric discharge: moderate electric discharge is in the developing stage of shelf depreciation, and discharge time and electric discharge amplitude are more slightly discharged
There is obvious growth in stage, and in the two-dimensional histogram of shelf depreciation, discharge time increases, and electric discharge amplitude increases, and bears
The two peak structure of half cycle is slowly apparent from.The first peak of negative half period appears near 200 °, and the second peak appears near 240 °.
Serious electric discharge: serious electric discharge is in the distress phase of shelf depreciation, and strength of discharge is big at this time, the harm to equipment
Maximum, the graphic feature and electric discharge developing stage of shelf depreciation two-dimensional histogram at this time are essentially identical, but histogram is double
Peak structure disappears, and starts single-peak structure occur.
Table 1
| Serial number | Defect level | Maintenance measure |
| 1 | Discharge off, defect level 0~10 | Health is not processed |
| 2 | Slight electric discharge, defect level 10~20 | Line walking concern, is detected again after six months |
| 3 | Moderate electric discharge, defect level 20~30 | Line walking concern, is detected again after three months |
| 4 | Serious electric discharge, 30 or more defect level | It overhauls and replaces in the recent period |
In specific implementation, only with infrared detection, faint hidden danger can not be found, vulnerable to the influence of ambient temperature,
Therefore by itself and high sensitivity, it can detect faint hidden danger；Adapt to outdoor environment, the ultrasound examination phase not influenced by ambient sound
In conjunction with the most failures that can detect that overhead line structures, the Detection accuracy of failure is effectively improved.
The present embodiment also provides a kind of system for improving the online fault detection accuracy rate of overhead line structures, comprising:
Threshold determination module: for obtaining the fault type judgment threshold of each equipment according to history infrared detections, with
And the defect level judgment threshold of each equipment is obtained according to history ultrasound examination result；
Equipment fault type judging module: for acquiring the infrared measurement of temperature data of each equipment, signal conversion is carried out, according to each
The difference of device type is compared respectively to carry out equipment fault type judgement from different fault type judgment thresholds；
Equipment deficiency degree determining module: for acquiring the ultrasonic test data of each equipment, amplification and filter are carried out
After wave, ultrasonic wave waveform and audio volume control are converted to, and be compared with corresponding defect level judgment threshold, determine that equipment lacks
The degree of falling into；
Output module: corresponding processing is provided for bonding apparatus fault type judging result and equipment deficiency degree and is built
View.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Although above-mentioned be described in conjunction with specific embodiment of the attached drawing to the disclosure, model not is protected to the disclosure
The limitation enclosed, those skilled in the art should understand that, on the basis of the technical solution of the disclosure, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within the protection scope of the disclosure.
Claims (10)
1. a kind of method for improving the online fault detection accuracy rate of overhead line structures characterized by comprising
The fault type judgment threshold of each equipment is obtained according to history infrared detections, and according to history ultrasound examination knot
Fruit obtains the defect level judgment threshold of each equipment；
Acquire the infrared measurement of temperature data of each equipment, carry out signal conversion, according to the difference of each device type, respectively from it is different therefore
Barrier type judgment threshold is compared to carry out equipment fault type judgement；
The ultrasonic test data for acquiring each equipment is converted to ultrasonic wave waveform and audio wave after being carried out amplification and filtering
Shape, and be compared with corresponding defect level judgment threshold, determine equipment deficiency degree；
Bonding apparatus fault type judging result and equipment deficiency degree provide corresponding treatment advice.
2. a kind of method for improving the online fault detection accuracy rate of overhead line structures as described in claim 1, which is characterized in that institute
Stating and carrying out the judgement of equipment fault type according to infrared measurement of temperature data includes surface temperature determining method, and the surface temperature determining method is used
Judge in the external thermal fault of equipment, specifically include the surface temperature value of measuring device, and by its temperature with relevant device and
Temperature rise limit standard compares, and the ambient temperature and load when in combination with measurement judge whether equipment breaks down.
3. a kind of method for improving the online fault detection accuracy rate of overhead line structures as described in claim 1, which is characterized in that institute
Stating and carrying out the judgement of equipment fault type according to infrared measurement of temperature data includes relative temperature difference determining method, and the relative temperature difference determining method is used
In the breakdown judge of current caused hot equipment, specifically includes and two same or similar corresponding measuring points of controller switching equipment situation are subjected to temperature
Degree subtracts each other, and judges whether equipment breaks down with the wherein biggish ratio of temperature rise amplitude according to resulting difference.
4. a kind of method for improving the online fault detection accuracy rate of overhead line structures as described in claim 1, which is characterized in that institute
Stating and carrying out the judgement of equipment fault type according to infrared measurement of temperature data includes similar comparison method, and the similar comparison method is used for same electricity
The breakdown judge of air circuit compares three-phase current pyrogenicity type equipment and corresponds to portion when three-phase current is symmetrical identical with three-phase equipment
When whether the temperature rise value of position breaks down judging equipment or biphase current is symmetrical identical with two-phase equipment, compare biphase current
The temperature rise value of pyrogenicity type equipment corresponding position judges whether equipment breaks down.
5. a kind of method for improving the online fault detection accuracy rate of overhead line structures as claimed in claim 4, which is characterized in that institute
If stating similar comparison method to further include three-phase equipment while exception occur, can by its with compared with the same category of device in circuit；If three
When phase load electric current asymmetry, then it is judged as that load current or operating voltage are abnormal.
6. a kind of method for improving the online fault detection accuracy rate of overhead line structures as claimed in claim 5, which is characterized in that institute
Stating similar comparison method further includes the voltage pyrogenicity type equipment for equivalent specifications, can be set by the diversity judgement of respective point temperature rise value
It is standby whether to break down, if voltage pyrogenicity type equipment existing defects, can with the judgment basis of temperature rise or the similar permission temperature difference come
It determines.
7. a kind of method for improving the online fault detection accuracy rate of overhead line structures as described in claim 1, which is characterized in that institute
Stating and carrying out the judgement of equipment fault type according to infrared measurement of temperature data includes Thermogram analytic approach, and the Thermogram analytic approach is for same
Class equipment fault judgement, specifically includes and draws out Thermogram of the same category of device under normal condition and abnormality, and compare
Compared with their difference, to judge whether equipment is normal.
8. a kind of method for improving the online fault detection accuracy rate of overhead line structures as described in claim 1, which is characterized in that institute
State equipment fault type include crackle, erosion, carbonization phenomenon, breakdown trace, bad, the burn into surface contamination of installation, tarnish,
Sur-face peeling and tree mill conducting wire.
9. a kind of method for improving the online fault detection accuracy rate of overhead line structures as described in claim 1, which is characterized in that institute
It states and determines that equipment deficiency degree is specifically included according to ultrasonic test data and sentenced according to the ultrasonic wave waveform and audio volume control of conversion
The degree of discharge of disconnected equipment, judges equipment deficiency degree according to equipment degree of discharge.
Or
The equipment deficiency degree specifically includes, and when equipment discharge off, defect level is 0~10；When equipment is slightly discharged
When, depth of defect is 10~20；When the electric discharge of equipment moderate, defect level is 20~30；When equipment is seriously discharged,
Defect level is 30 or more.
10. a kind of system for improving the online fault detection accuracy rate of overhead line structures characterized by comprising
Threshold determination module: for obtaining the fault type judgment threshold of each equipment, Yi Jigen according to history infrared detections
The defect level judgment threshold of each equipment is obtained according to history ultrasound examination result；
Equipment fault type judging module: for acquiring the infrared measurement of temperature data of each equipment, signal conversion is carried out, according to each equipment
The difference of type is compared respectively to carry out equipment fault type judgement from different fault type judgment thresholds；
Equipment deficiency degree determining module: for acquiring the ultrasonic test data of each equipment, after being carried out amplification and filtering,
Ultrasonic wave waveform and audio volume control are converted to, and is compared with corresponding defect level judgment threshold, determines equipment deficiency journey
Degree；
Output module: corresponding treatment advice is provided for bonding apparatus fault type judging result and equipment deficiency degree.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113014722A (en) * | 2021-01-26 | 2021-06-22 | 国网浙江省电力有限公司金华供电公司 | Overheat identification system and method based on thermal imager of mobile phone |
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| CN109342906A (en) * | 2018-12-05 | 2019-02-15 | 山东大学 | Multi-functional local discharge detection device, system and method |
| CN109557441A (en) * | 2019-01-25 | 2019-04-02 | 山东大学 | It can pinpoint local discharge detection device |
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Application publication date: 20190917 |