CN107329053A - A kind of method that utilization high-speed camera measures suspended conductor induction discharge frequency - Google Patents
A kind of method that utilization high-speed camera measures suspended conductor induction discharge frequency Download PDFInfo
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- CN107329053A CN107329053A CN201710383429.7A CN201710383429A CN107329053A CN 107329053 A CN107329053 A CN 107329053A CN 201710383429 A CN201710383429 A CN 201710383429A CN 107329053 A CN107329053 A CN 107329053A
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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
- G01R31/1218—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 optical methods; using charged particle, e.g. electron, beams or X-rays
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Abstract
The invention discloses a kind of method that utilization high-speed camera measures suspended conductor induction discharge frequency, step includes：The electric discharge moment image of suspended conductor is continuously shot using high-speed camera；The image shot is stored in computer, the color characteristic data of each two field picture is imported into matlab softwares and gray level image is converted into, matlab softwares extract the maximum gradation value of gray level image, is stored by the order sequence number of its frame number；According to the gray-value variation law characteristic of image, the brightness period of change of image is calculated；After the gross error for rejecting brightness period of change, the average value of brightness period of change is calculated；The induction discharge frequency of suspended conductor is obtained according to the mean value calculation of brightness period of change.The present invention observes suspended conductor induction discharge using high-speed camera, and extracts effective image according to the gray value of image, and the data to effective image carry out statistical analysis, obtain discharge frequency.
Description
Technical field
Put the present invention relates to technical field of high voltage, more particularly to one kind using high-speed camera measurement suspended conductor sensing
The method of electric frequency.
Background technology
Suspended conductor induction discharge is a kind of common electric discharge phenomena in High voltage power frequence electric field, due in discharge process
High voltage can be produced, destruction difficult to the appraisal is caused to equipment, the phenomenon has caused the most attention of various countries researcher.It is logical
Often, induction discharge is defined as the shelf depreciation caused by induced voltage, that is to say, that suspended conductor induction discharge is due to outstanding
Electrostatic induction occurs in highfield for floating conductor, raises its current potential, as high-voltage charged body, is finally put with peripheral conductor
The phenomenon of electricity.
The method for studying induction discharge is varied, and conventional method has following several：
1. set up the distributed parameter model analysis of discharge circuit networking；
2. set up electrostatic field finite element model analysis.
For under research power frequency electric field, the rule of suspended conductor induction discharge is simultaneously counted, and the present invention utilizes high-speed camera
Machine, which is caught, to generate electricity moment and extracts effective image according to image intensity value, and discharging law is studied with this.When suspended conductor occurs
During induction discharge, electron avalanche and streamer passage can be constantly formed between electrode and conductor, due to streamer passage development speed
The order of magnitude is 10^8cm/s, therefore human eye can not observe the development of streamer.And utilize high-speed camera can be with very high
The dynamic image of frequency record one, typically can be with the speed record of 1000~10000 frame per second, but which results in every
Pixel will not be too high, while the picture number shot is as many as very.
Therefore using high-speed camera observation induction discharge moment on the basis of, how effectively and rapidly to screen image into
For the emphasis of research.
The content of the invention
In order to overcome the shortcoming and deficiency that prior art is present, the present invention is provided a kind of measured using high-speed camera and suspended
The method of conductor induction discharge frequency, electric discharge moment is caught using high-speed camera, and quick in substantial amounts of shooting image
Effective electric discharge image is found, is easy to count the induction discharge frequency of suspended conductor.
In order to solve the above technical problems, the present invention provides following technical scheme：One kind is measured using high-speed camera and suspended
The method of conductor induction discharge frequency, comprises the following steps：
S1, the electric discharge moment image for being continuously shot using high-speed camera suspended conductor；
The color characteristic data of each two field picture is imported matlab softwares simultaneously by the image that S2, storage are shot in computer
Gray level image is converted into, matlab softwares extract the maximum gradation value of gray level image, is stored by the order sequence number of its frame number；
S3, the gray-value variation law characteristic according to image, calculate the brightness period of change of image；
After S4, the gross error of rejecting brightness period of change, the average value of brightness period of change is calculated；Changed according to brightness
The mean value calculation in cycle obtains the induction discharge frequency of suspended conductor.
Further, the electric discharge moment image of suspended conductor is continuously shot in the step S1, during the interval shot every time
Between be 5S.
Further, the step S1, during the electric discharge moment image of suspended conductor is shot, high-speed camera need to be with
The region of discharge of suspended conductor keeps level, and keeps certain safe distance.
Further, the step S1, it is necessary to the curtain of black during the electric discharge moment image of suspended conductor is shot
Cloth is as shooting background, to increase the brightness contrast of electric discharge image and the image that do not discharge and be easy to screen image.
Further, the step S3 falls into a trap the brightness period of change of nomogram picture, and calculation is specially：
Tx=T0*(N+1)
Wherein, TxFor brightness period of change, T0For every two field picture interval time of shooting, N is two adjacent non-zero maximums
Gray value interval frame number.
Further, the induction discharge frequency for obtaining suspended conductor is calculated in the step S4, it is specially：
Because the maximum gradation value of image before electric discharge is 0, the maximum gradation value of electric discharge moment image is more than 0, so suspending
Conductor induction discharge frequency is equal with brightness change frequency, i.e. suspended conductor induction discharge frequency calculation formula is：
F=1/Txav
Wherein, f is suspended conductor induction discharge frequency, TxavFor the average value of brightness period of change.
After adopting the above technical scheme, the present invention at least has the advantages that：The present invention is seen by the method for experiment
Suspended conductor induction discharge phenomenon is surveyed, real result is reliable；The present invention calculates suspended conductor induction frequencies by statistical analysis, subtracts
Small accidental error；The present invention extracts brightness of image, finally according to the difference of the image intensity value of the electric discharge of shooting using matlab
Effective image can be filtered out to be counted, discharge frequency is obtained.
Brief description of the drawings
Fig. 1 measures the method and step flow of suspended conductor induction discharge frequency for a kind of utilization high-speed camera of the invention
Figure；
Fig. 2 is the environment schematic of simulation suspended conductor discharge test in the embodiment of the present invention；
Fig. 3 is the shooting environmental schematic diagram of simulation suspended conductor discharge test in the embodiment of the present invention.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combine, the application is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, the invention provides the side that a kind of utilization high-speed camera measures suspended conductor induction discharge frequency
Method, step is：
S1, the electric discharge moment image for being continuously shot using high-speed camera suspended conductor；
The color characteristic data of each two field picture is imported matlab softwares simultaneously by the image that S2, storage are shot in computer
Gray level image is converted into, matlab softwares extract the maximum gradation value of gray level image, is stored by the order sequence number of its frame number；
S3, the gray-value variation law characteristic according to image, calculate the brightness period of change of image, and calculation formula is：
Tx=T0*(N+1) (1)
Wherein, T0For every two field picture interval time of shooting, N is two adjacent non-zero maximum gradation value interval frame numbers.
After S4, the gross error of rejecting brightness period of change, the average value of brightness period of change is calculated, due to scheming before electric discharge
The maximum gradation value of picture be 0, electric discharge moment image maximum gradation value be more than 0, so suspended conductor induction discharge frequency with it is bright
Degree change frequency is equal, i.e. suspended conductor induction discharge frequency calculation formula is：
F=1/Txav (2)
Wherein, f is suspended conductor induction discharge frequency, TxavFor the average value of brightness period of change.
Embodiment
(1) experimental situation is set
As shown in Fig. 2 simulating suspended conductor discharge test environment by transformer, wire and prill, adjustment is at a high speed
Camera position, camera keeps level with region of discharge.To avoid the electromagnetic interference of highfield, video camera must be protected with wire
Hold certain safe distance.
(2) shooting environmental is set
As shown in figure 3, black curtain is set behind wire and bead as background, while being fitted to the environment of surrounding
Local shading.Due to occurring that during induction discharge arc glow can be produced, and black curtain will not reflect any light as background,
So cameras capture to the light of image can only come from electric arc.The figure for not occurring to capture during induction discharge can so be made
Image brightness is almost nil, and when occurring induction discharge, image has certain brightness value.It is easy to following ground step for shooting figure
The screening of picture.
(3) shoot and store image
After discharge test preparation is rationally abundant, first opens high-speed camera and taken pictures in advance, it is ensured that shot when not discharging
Brightness of image is zero.Then next electric discharge phenomena are shot, it is 5s to set the time shot every time, first makes suspended conductor
Induction discharge is produced, high-speed camera is then opened and is shot.The image of shooting is finally stored in computer, and by several times in an orderly manner
Put in order.
(4) brightness of image screening is extracted
The data for the shooting image discharged every time are imported into matlab, the brightness of image, meter are extracted by matlab
The brightness period of change of nomogram picture, averages after rejecting gross error, so as to obtain the induction discharge frequency of suspended conductor.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understand, can carry out a variety of equivalent changes to these embodiments without departing from the principles and spirit of the present invention
Change, change, replace and modification, the scope of the present invention is limited by appended claims and its equivalency range.
Claims (6)
1. a kind of method that utilization high-speed camera measures suspended conductor induction discharge frequency, it is characterised in that including following step
Suddenly：
S1, the electric discharge moment image for being continuously shot using high-speed camera suspended conductor；
The color characteristic data of each two field picture is imported matlab softwares and converted by the image that S2, storage are shot in computer
For gray level image, matlab softwares extract the maximum gradation value of gray level image, are stored by the order sequence number of its frame number；
S3, the gray-value variation law characteristic according to image, calculate the brightness period of change of image；
After S4, the gross error of rejecting brightness period of change, the average value of brightness period of change is calculated；According to brightness period of change
Mean value calculation obtain the induction discharge frequency of suspended conductor.
2. the method that a kind of utilization high-speed camera according to claim 1 measures suspended conductor induction discharge frequency, its
It is characterised by, the electric discharge moment image of suspended conductor is continuously shot in the step S1, and the interval time shot every time is 5S.
3. the method that a kind of utilization high-speed camera according to claim 1 measures suspended conductor induction discharge frequency, its
It is characterised by, the step S1, during the electric discharge moment image of suspended conductor is shot, high-speed camera is needed and suspended conductor
Region of discharge keep level, and keep certain safe distance.
4. the method that a kind of utilization high-speed camera according to claim 1 measures suspended conductor induction discharge frequency, its
It is characterised by, the step S1, it is necessary to be used as bat using the curtain of black during the electric discharge moment image of suspended conductor is shot
Background is taken the photograph, to increase the brightness contrast of electric discharge image and the image that do not discharge and be easy to screen image.
5. the method that a kind of utilization high-speed camera according to claim 1 measures suspended conductor induction discharge frequency, its
It is characterised by, the step S3 falls into a trap the brightness period of change of nomogram picture, calculation is specially：
Tx=T0*(N+1)
Wherein, TxFor brightness period of change, T0For every two field picture interval time of shooting, N is the maximum gray scale of two adjacent non-zeros
Value interval frame number.
6. the method that a kind of utilization high-speed camera according to claim 1 measures suspended conductor induction discharge frequency, its
It is characterised by, the induction discharge frequency for obtaining suspended conductor is calculated in the step S4, it is specially：
Because the maximum gradation value of image before electric discharge is 0, the maximum gradation value of electric discharge moment image is more than 0, so suspended conductor
Induction discharge frequency is equal with brightness change frequency, i.e. suspended conductor induction discharge frequency calculation formula is：
F=1/Txav
Wherein, f is suspended conductor induction discharge frequency, TxavFor the average value of brightness period of change.
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Cited By (2)
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| CN110045242A (en) * | 2019-04-22 | 2019-07-23 | 国网湖南省电力有限公司 | Arc light monitoring method, system, medium and equipment in a kind of switchgear |
| CN110940899A (en) * | 2019-11-22 | 2020-03-31 | 清华大学深圳国际研究生院 | Air gap discharge shooting device, path identification method, computer and medium |
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| CN110940899A (en) * | 2019-11-22 | 2020-03-31 | 清华大学深圳国际研究生院 | Air gap discharge shooting device, path identification method, computer and medium |
| CN110940899B (en) * | 2019-11-22 | 2022-04-01 | 清华大学深圳国际研究生院 | Air gap discharge shooting device, path identification method, computer and medium |
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