CN107037335B - A kind of method and device of ultraviolet power equipment measurement discharge fault true photon number - Google Patents
A kind of method and device of ultraviolet power equipment measurement discharge fault true photon number Download PDFInfo
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- CN107037335B CN107037335B CN201710248450.6A CN201710248450A CN107037335B CN 107037335 B CN107037335 B CN 107037335B CN 201710248450 A CN201710248450 A CN 201710248450A CN 107037335 B CN107037335 B CN 107037335B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005259 measurement Methods 0.000 title claims abstract description 27
- 210000001747 pupil Anatomy 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 12
- 238000004458 analytical method Methods 0.000 description 2
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
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- 239000011521 glass Substances 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000005457 optimization Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000000825 ultraviolet detection Methods 0.000 description 1
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Classifications
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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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- 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
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Locating Faults (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of methods of ultraviolet power equipment measurement discharge fault true photon number, comprising the following steps: S1: being imaged by ultraviolet imager to corona discharge fault point, obtains primary light subnumber N；S2: the corresponding number of pixels P of diametrical direction of target electrical equipment where identifying discharge fault point by Graphic Pattern Matching recognizer；S3: the true electric discharge number of photons N of discharge fault point is calculated0.The invention also discloses a kind of devices of ultraviolet power equipment measurement discharge fault true photon number, including ultraviolet imager, input module and computing module.The method of the present invention is simple, without using distance-measuring equipment, can passively obtain distance of the fault point to be measured with respect to observation point in real time, and calculates the true electric discharge number of photons of discharge fault point.
Description
Technical field
The present invention relates to power failure detection fields, true more particularly to a kind of ultraviolet power equipment measurement discharge fault
The method and device of number of photons.
Background technique
Testing staff is main according to inside ultraviolet imager when carrying out power failure detection using ultraviolet imager at present
The photon counting function of including analyzes the severity of power failure.Ultraviolet imagery equipment is to ultraviolet imagery channel at present
Acquisition video is analyzed, and calculates the quantity of hot spot in ultraviolet image as photon count value.In actual use, same
Equipment changes at a distance from power equipment for the photon count value of the signal of same intensity with patrol officer, therefore logical at present
Photon count value itself can not veritably reflect the practical luminous intensity of target faults point, cause using ultraviolet imager
It carries out power failure detection and only resides within experience and qualitative analysis degree, greatly restrict ultraviolet detection method in electric power event
Hinder the popularization and application of detection field.
In order to obtain the distance between measurement position and fault point, it is required to additionally use range unit in existing scheme.
Industrial Large-scale Measuring Instruments mainly have three classes in the world at present, are laser interferometer respectively, fixed coordinate measuring machine, portable
Formula coordinate measuring system.Laser interferometer measurement range is big, mainly solves the essence of the Precision Position Location Systems such as lathe, coordinate measuring machine
Degree assessment.Within the scope of 40m, measurement accuracy can achieve 0.7*10-6, and fixed coordinate measuring system is swept by laser
The mode retouched determines the size of target object.These common measuring instruments largely belong to active measurement method, need
Transmitting signal simultaneously receives feedback, to obtain the specific location of target.Specific to power failure detection field, the above active measurement
Instrument, which is limited by itself, can not determine specific position of failure point, can not accurately obtain distance of the fault point with respect to observation point；It is another
Aspect, equipment volume weight itself and additional measurement work increase the whole complexity of power failure detection, influence to examine
Survey efficiency.
Summary of the invention
Goal of the invention: the object of the present invention is to provide a kind of ultraviolet power equipments without using distance-measuring equipment to measure electric discharge
The method and device of failure true photon number.
Technical solution: the method for ultraviolet power equipment measurement discharge fault true photon number of the present invention, including with
Lower step:
S1: corona discharge fault point is imaged by ultraviolet imager, obtains primary light subnumber N；
S2: the diametrical direction of target electrical equipment is corresponding where identifying discharge fault point by images match recognizer
Number of pixels P；
S3: the true electric discharge number of photons N of discharge fault point is calculated according to formula (1)0:
In formula (1), D is ultraviolet channel Entry pupil diameters, and θ is horizontal direction field angle, and W is horizontal direction sum of all pixels, and L is
Target electrical equipment diametrical direction actual size.
Further, the ultraviolet imager includes day blind ultraviolet channel and visible channel, horizontal direction field angle θ and water
Square demarcated by the following method to sum of all pixels W: ultraviolet imager be placed on turntable, by it is a branch of include UV signal
With the incident ultraviolet channel of directional light of visible light signal and visible channel, rotating table makes into respectively after focusing imaging
Picture point is located at the left and right edge of image, horizontal direction field angle θ is calculated, recorded video checks video level direction later
Sum of all pixels W.
Further, the ultraviolet channel Entry pupil diameters D is calculated by formula (2):
In formula (2), DOutsideFor the overall diameter of ultraviolet lens ring-type light transmission part；When ultraviolet lens are refraction-reflection type or reflective
When, DIt is interiorFor the interior diameter of ultraviolet lens ring-type light transmission part；When ultraviolet lens are transmission-type, DIt is interior=0.
Further, in the step S2, after obtaining primary light subnumber N, primary light subnumber N is filtered, removal is made an uproar
Sound.
Further, primary light subnumber N is filtered using Kalman filtering mode.
Further, in the step S3, the diametrical direction of target electrical equipment is corresponding where identifying discharge fault point
After number of pixels P, time-domain filtering is carried out, removes noise.
Further, in the step S3, target where identifying discharge fault point by images match recognizer is electrical
After the corresponding number of pixels P of the diametrical direction of equipment, distance of the ultraviolet imager apart from discharge fault point is obtained according to formula (3)
Calculated value d ', calculated value d ' is compared with true value d, by formula (4) optimize proportionality coefficient k, reuse correction formula
(5) the calculated value d " after being optimized；
D '=kd (4)
Further, the target electrical equipment diametrical direction actual size L in the step S3 is determined by the following method: being sentenced
Whether disconnected be for the first time using this method: if it is, target electrical equipment diametrical direction actual size L is by consulting change to be measured
The electrical equipment relative dimensions standard in power station obtains；Otherwise, then judge the last Substation Electric Equipment to be measured used and this
Whether the secondary Substation Electric Equipment to be measured used is same model, if it is same model, directlys adopt last L and makees
This then is obtained by consulting the electrical equipment relative dimensions standard of substation to be measured if not same model for this L
L.
The device of ultraviolet power equipment measurement discharge fault true photon number of the present invention, comprising:
Ultraviolet imager: for corona discharge fault point to be imaged, primary light subnumber N is obtained；
Input module: for inputting ultraviolet channel Entry pupil diameters D, horizontal direction field angle θ, horizontal direction sum of all pixels W,
Target electrical equipment diametrical direction actual size L；
Computing module: for the straight of target electrical equipment where identifying discharge fault point by images match recognizer
The corresponding number of pixels P in diameter direction, and according to the true electric discharge number of photons N of formula (1) calculating discharge fault point0:
Further, the input module and the computing module are integrated in the ultraviolet imager.
The utility model has the advantages that the invention discloses the methods and dress of a kind of ultraviolet power equipment measurement discharge fault true photon number
It sets, method is simple, without using distance-measuring equipment, can passively obtain distance of the fault point to be measured with respect to observation point in real time, and count
Calculate the true electric discharge number of photons of discharge fault point.The invention enables the number of photons numerical value detected to have practical significance, passes through letter
Single operation can be quickly obtained true electric discharge number of photons, be able to solve current ultraviolet imagery equipment in power fault analysis field
In the problem of being difficult to accurate quantitative analysis, facilitate the foundation and popularization of ultraviolet inspection directive/guide, preferably to safeguard substation's electricity
Gas equipment ensures power grid security efficient operation.
Detailed description of the invention
Fig. 1 is the schematic diagram of the detection model in the embodiment of the present invention 1；
Fig. 2 is the method flow diagram in the embodiment of the present invention 1.
Specific embodiment
Embodiment 1:
Embodiment 1 discloses a kind of method of ultraviolet power equipment measurement discharge fault true photon number, as shown in Fig. 2,
The present embodiment is first time using the ultraviolet imager, therefore method includes the following steps:
S11: the following parameter of ultraviolet imager is demarcated: ultraviolet channel Entry pupil diameters D, horizontal direction field angle θ, level side
To sum of all pixels W；Ultraviolet imager includes day blind ultraviolet channel and visible channel.
In step 511, horizontal direction field angle θ and horizontal direction sum of all pixels W are demarcated by the following method: will be purple
Outer imager is placed on turntable, by the incident ultraviolet channel of a branch of directional light comprising UV signal and visible light signal and visible light
Channel, rotating table makes imaging point be located at the left and right edge of image respectively after focusing imaging, and horizontal direction is calculated
Field angle θ, recorded video checks video level direction sum of all pixels W later.For the general purple for hiding door screen with center in the market
Outer camera lens, ultraviolet channel Entry pupil diameters D are calculated by formula (1):
In formula (1), DOutsideFor the overall diameter of ultraviolet lens ring-type light transmission part, DIt is interiorFor in ultraviolet lens ring-type light transmission part
Diameter.
The electrical equipment relative dimensions standard that target electrical equipment diametrical direction actual size L passes through access substation to be measured
It obtains.
After having demarcated the parameters of ultraviolet imager, parameters are entered into location algorithm, pass through location algorithm
Optimize parameters.
S21: being directed at corona discharge fault point for ultraviolet imager, adjusts gain to suitable gear, and according to target strength
Focusing is adjusted, if signal is stronger, focusing can be suitably adjusted and improve primary photon counting precision to out-of-focus appearance, pass through in this way
Corona discharge fault point is imaged in ultraviolet imager, obtains primary light subnumber N.
S31: the diametrical direction pair of target electrical equipment where identifying discharge fault point by images match recognizer
The number of pixels P answered.Later, the calculated value d ' of distance of the ultraviolet imager apart from discharge fault point is obtained according to formula (2).It will meter
Calculation value d ' is compared with true value d, optimizes proportionality coefficient k by formula (3), is reused after correction formula (4) optimized
Calculated value d "；
D '=kd (3)
S41: the true electric discharge number of photons N of discharge fault point is calculated according to formula (5)0:
The derivation process of a following formula (5) is described below:
Detection model is as shown in Figure 1, the true electric discharge number of photons of discharge fault point is N0, ultraviolet imager puts positioned at distance
The distance of electric fault point d detects that primary light subnumber is N at this time.
The known ultraviolet channel Entry pupil diameters of ultraviolet imager are D, then the area of the ultraviolet channel receiving signal of ultraviolet imager
For S, can be obtained by round areal calculation formula:
Radiation signal is radiated around with spherical surface, and ultraviolet imager received signal is the one of the spherical surface that distance is d
Part, by geometric formula can calculate radius be d when, the surface area of ball:
SBall=4 π d2 (7)
Compared to detecting distance, ultraviolet lens bore generally differs two orders of magnitude or more, therefore can use ultraviolet mirror
The spherical corona's area for the ultraviolet imager camera lens that head aperture area approximate signal is reached:
The relationship of the number of photons and practical number of photons that receive are as follows:
I.e.
According to substation's construction requirements, substation can generally select the electrical equipment of certain fixing model, including insulator, press
Ring, conducting wire, fitting etc., wherein insulator is formed by stacking by multiple disk-like glass or pottery video disc, and grading ring itself is circular ring shape
The cross section of shape, conducting wire and fitting is also round, therefore is observed from different directions, and the above diametric width of electrical equipment exists
Image will not deformation occurs.This calculates that detecting distance provides condition using electrical equipment diametrical direction width for the present invention.When
Detection device is certain, known to detection target when, detecting distance can be calculated:
In formula (11), y ' is the image height of electrical equipment diametrical direction width in the picture, can be obtained by reading image；
F is focal length, is the intrinsic parameter of detection device, and L is target electrical equipment diametrical direction actual size,
On the other hand, diameter corresponds to image height y ' can be changed into the corresponding picture of diametrical direction after imaging with the ratio of focal length f again
Relationship between plain number P and ultraviolet imager horizontal direction field angle θ and horizontal direction sum of all pixels W:
Therefore actual discharge number of photons can be changed to formula relevant to diametrical direction image height y ':
By the diametric image height of electrical equipment in analysis image, the true electric discharge of the discharge fault point can be extrapolated
Number of photons avoids influence of the distance d to ultraviolet imager detection number of photons.
It, can also be by artificially judging and it is apart from close circle for the point of discharge that position generates on non-circular device
Shape electrical equipment is to obtain its true electric discharge number of photons.
Embodiment 2:
Embodiment 2 discloses a kind of method of ultraviolet power equipment measurement discharge fault true photon number, and the present embodiment is
The ultraviolet imager is used for the second time, does not need to demarcate again, and the last substation to be measured electricity being directed to using this method
The model of gas equipment is identical with the model of Substation Electric Equipment to be measured that this is directed to using this method, therefore this method includes
Following steps:
S12: being directed at corona discharge fault point for ultraviolet imager, adjusts gain to suitable gear, and according to target strength
Focusing is adjusted, if signal is stronger, focusing can be suitably adjusted and improve primary photon counting precision to out-of-focus appearance, pass through in this way
Corona discharge fault point is imaged in ultraviolet imager, obtains primary light subnumber N.After obtaining primary light subnumber N, to primary photon
Number N carries out Kalman filtering.
S22: the diametrical direction pair of target electrical equipment where identifying discharge fault point by Graphic Pattern Matching recognizer
The number of pixels P answered.It is right after the corresponding number of pixels P of diametrical direction of target electrical equipment where identifying discharge position
The corresponding number of pixels P of the diametrical direction of target electrical equipment carries out Kalman filtering where discharge position.Later, according to formula
(14) distance d ' of the ultraviolet imager apart from discharge fault point is calculated.
One group of d ' is compared with the true value d obtained with laser range finder, is obtained with least square method by formula (15)
To proportionality coefficient k.It is worth in subsequent applications using the calculated value d " after correction formula (16) calculation optimization.
D '=kd (15)
In formula (16), L is identical using the L of this method typing with the last time, and W, θ are and the last time uses this method to demarcate
W, θ is identical.
S32: the true electric discharge number of photons N of discharge fault point is calculated according to formula (17)0:
In formula (17), D is identical with the last D demarcated using this method.
Embodiment 3:
Present embodiment discloses a kind of devices of ultraviolet power equipment measurement discharge fault true photon number, comprising:
Ultraviolet imager: for corona discharge fault point to be imaged, primary light subnumber N is obtained；
Input module: for inputting ultraviolet channel Entry pupil diameters D, horizontal direction field angle θ, horizontal direction sum of all pixels W,
Target electrical equipment diametrical direction actual size L；
Computing module: for the straight of target electrical equipment where identifying discharge fault point by images match recognizer
The corresponding number of pixels P in diameter direction, and according to the true electric discharge number of photons N of formula (18) calculating discharge fault point0:
To be used convenient for actual production, the device of the ultraviolet power equipment measurement discharge fault true photon number of the present embodiment
Input module and computing module are integrated in the ultraviolet imager.
Claims (10)
1. a kind of method of ultraviolet power equipment measurement discharge fault true photon number, it is characterised in that: the following steps are included:
S1: corona discharge fault point is imaged by ultraviolet imager, obtains primary light subnumber N；
S2: the corresponding picture of diametrical direction of target electrical equipment where identifying discharge fault point by images match recognizer
Plain number P；
S3: the true electric discharge number of photons N of discharge fault point is calculated according to formula (1)0:
In formula (1), D is ultraviolet channel Entry pupil diameters, and θ is horizontal direction field angle, and W is horizontal direction sum of all pixels, and L is target
Electrical equipment diametrical direction actual size.
2. the method for ultraviolet power equipment measurement discharge fault true photon number according to claim 1, it is characterised in that:
The ultraviolet imager includes day blind ultraviolet channel and visible channel, horizontal direction field angle θ and horizontal direction sum of all pixels W
It is demarcated by the following method: ultraviolet imager is placed on turntable, by a branch of comprising UV signal and visible light signal
The incident ultraviolet channel of directional light and visible channel, rotating table makes imaging point be located at image respectively after focusing imaging
Horizontal direction field angle θ is calculated in left and right edge, and recorded video checks video level direction sum of all pixels W later.
3. the method for ultraviolet power equipment measurement discharge fault true photon number according to claim 1, it is characterised in that:
The ultraviolet channel Entry pupil diameters D is calculated by formula (2):
In formula (2), DOutsideFor the overall diameter of ultraviolet lens ring-type light transmission part；When ultraviolet lens are refraction-reflection type or are reflective, DIt is interior
For the interior diameter of ultraviolet lens ring-type light transmission part；When ultraviolet lens are transmission-type, DIt is interior=0.
4. the method for ultraviolet power equipment measurement discharge fault true photon number according to claim 1, it is characterised in that:
In the step S2, after obtaining primary light subnumber N, primary light subnumber N is filtered, removes noise.
5. the method for ultraviolet power equipment measurement discharge fault true photon number according to claim 1, it is characterised in that:
Primary light subnumber N is filtered using Kalman filtering mode.
6. the method for ultraviolet power equipment measurement discharge fault true photon number according to claim 1, it is characterised in that:
In the step S3, after the corresponding number of pixels P of diametrical direction of target electrical equipment where identifying discharge fault point, into
Row time-domain filtering removes noise.
7. the method for ultraviolet power equipment measurement discharge fault true photon number according to claim 1, it is characterised in that:
In the step S3, the diametrical direction pair of target electrical equipment where identifying discharge fault point by images match recognizer
After the number of pixels P answered, the calculated value d ' of distance of the ultraviolet imager apart from discharge fault point is obtained according to formula (3), will be counted
Calculation value d ' is compared with true value d, optimizes proportionality coefficient k by formula (4), is reused after correction formula (5) optimized
Calculated value d "；
D '=kd (4)
8. the method for ultraviolet power equipment measurement discharge fault true photon number according to claim 1, it is characterised in that:
Target electrical equipment diametrical direction actual size L in the step S3 is determined by the following method: judging whether it is for the first time
Using this method: if it is, electrical equipment of the target electrical equipment diametrical direction actual size L by access substation to be measured
Relative dimensions standard obtains；Otherwise, then judge the change to be measured that the last Substation Electric Equipment to be measured used is used with this
Whether electric plant is same model, if it is same model, directlys adopt last L as this L, if
It is not same model, then obtains this L by consulting the electrical equipment relative dimensions standard of substation to be measured.
9. a kind of device of ultraviolet power equipment measurement discharge fault true photon number, it is characterised in that: include:
Ultraviolet imager: for corona discharge fault point to be imaged, primary light subnumber N is obtained；
Input module: for inputting ultraviolet channel Entry pupil diameters D, horizontal direction field angle θ, horizontal direction sum of all pixels W, target
Electrical equipment diametrical direction actual size L；
Computing module: the diameter side for target electrical equipment where identifying discharge fault point by images match recognizer
To corresponding number of pixels P, and according to the true electric discharge number of photons N of formula (1) calculating discharge fault point0:
10. the device of ultraviolet power equipment measurement discharge fault true photon number according to claim 9, feature exist
In the input module and the computing module are integrated in the ultraviolet imager.
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| CN109407028A (en) * | 2018-11-29 | 2019-03-01 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of ultraviolet standard source of hand-held |
| CN112255512A (en) * | 2020-10-10 | 2021-01-22 | 福州润森电气自动化有限公司 | Solar blind ultraviolet imaging device with laser ranging function and photon counting method |
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| CN104280670A (en) * | 2014-09-26 | 2015-01-14 | 北京环境特性研究所 | Corona detection method based on solar-blind ultraviolet imager |
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- 2017-04-17 CN CN201710248450.6A patent/CN107037335B/en active Active
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| CN101551435A (en) * | 2009-05-15 | 2009-10-07 | 湖北省电力试验研究院 | Method for detecting corona discharging and device thereof |
| CN202285037U (en) * | 2011-10-26 | 2012-06-27 | 沈阳工业大学 | 10kv insulator artificial contamination laboratory based on ultraviolet imagery |
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