CN107037335A - A kind of ultraviolet power equipment measures the method and device of discharge fault true photon number - Google Patents
A kind of ultraviolet power equipment measures the method and device of discharge fault true photon number Download PDFInfo
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- CN107037335A CN107037335A CN201710248450.6A CN201710248450A CN107037335A CN 107037335 A CN107037335 A CN 107037335A CN 201710248450 A CN201710248450 A CN 201710248450A CN 107037335 A CN107037335 A CN 107037335A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000000007 visual effect Effects 0.000 claims description 13
- 210000001747 pupil Anatomy 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 6
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
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- 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 method that ultraviolet power equipment measures discharge fault true photon number, comprise the following steps：S1：Corona discharge trouble point is imaged by ultraviolet imager, primary light subnumber N is obtained；S2：The corresponding number of pixels P of diametric(al) of target electrical equipment where identifying discharge fault point by Graphic Pattern Matching recognizer；S3：Calculate the true electric discharge number of photons N of discharge fault point0.The invention also discloses the device that a kind of ultraviolet power equipment measures discharge fault true photon number, including ultraviolet imager, input module and computing module.The inventive method is simple, without using distance-measuring equipment, distance of the trouble point to be measured with respect to observation station just can be passively obtained in real time, and calculate the true electric discharge number of photons of discharge fault point.
Description
Technical field
The present invention relates to power failure detection field, more particularly to a kind of ultraviolet power equipment measurement discharge fault is true
The method and device of number of photons.
Background technology
Current testing staff using ultraviolet imager when carrying out power failure detection, inside Main Basiss ultraviolet imager
Comprising photon counting function the order of severity of power failure is analyzed.Current ultraviolet imagery equipment is to ultraviolet imagery passage
Collection video is analyzed, and the quantity for calculating hot spot in ultraviolet image is used as photon count value.In actual use, same
Equipment changes for the photon count value of the signal of same intensity with the distance of patrol officer and power equipment, therefore logical at present
Photon count value can not veritably reflect the actual luminous intensity of target faults point in itself, cause to use ultraviolet imager
Carry out power failure detection and only reside within experience and qualitative analysis degree, greatly constrain 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 trouble 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 scope is big, mainly solves the essence of the Precision Position Location Systems such as lathe, coordinate measuring machine
Degree is assessed.In the range of 40m, its measurement accuracy can reach 0.7*10-6, and fixed coordinate measuring system is swept by laser
The mode retouched determines the size of target object.These conventional measuring instruments largely belong to active measuring method, it is necessary to
Transmission signal simultaneously receives feedback, so as to obtain the particular location of target.Specific to power failure detection field, the above is actively measured
Instrument, which is limited by itself, can not determine specific position of failure point, it is impossible to accurate to obtain distance of the trouble point with respect to observation station；It is another
Aspect, equipment volume weight itself adds the overall complexity of power failure detection, influence inspection with extra measurement work
Survey efficiency.
The content of the invention
Goal of the invention：Measure and discharge it is an object of the invention to provide a kind of ultraviolet power equipment without using distance-measuring equipment
The method and device of failure true photon number.
Technical scheme：The method that ultraviolet power equipment of the present invention measures discharge fault true photon number, including with
Lower step：
S1：Corona discharge trouble point is imaged by ultraviolet imager, primary light subnumber N is obtained；
S2：The diametric(al) correspondence of target electrical equipment 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 passage Entry pupil diameters, and θ is the horizontal direction angle of visual field, and W is horizontal direction sum of all pixels, and L is
Target electrical equipment diametric(al) actual size.
Further, the ultraviolet imager includes day blind ultraviolet passage and visible channel, horizontal direction angle of visual field θ and water
Square demarcated by the following method to sum of all pixels W：Ultraviolet imager is placed on turntable, UV signal is included by a branch of
With the directional light incident ultraviolet passage and visible channel of visible light signal, focus rotating table after imaging and cause into respectively
Picture point is located at the left and right edge of image, and calculating obtains horizontal direction angle of visual field θ, and recorded video checks video level direction afterwards
Sum of all pixels W.
Further, the ultraviolet passage Entry pupil diameters D is calculated by formula (2) and obtained：
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, obtain after 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 diametric(al) of target electrical equipment is corresponding where identifying discharge fault point
After number of pixels P, time-domain filtering is carried out, noise is removed.
Further, in the step S3, target where identifying discharge fault point by images match recognizer is electric
After the corresponding number of pixels P of diametric(al) 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 actual value d, by formula (4) optimized proportion coefficient k, correction formula is reused
(5) the calculated value d " after being optimized；
D '=kd (4)
Further, the target electrical equipment diametric(al) actual size L in the step S3 is determined by the following method：Sentence
Whether disconnected be to use this method for the first time：If it is, target electrical equipment diametric(al) actual size L is by consulting change to be measured
The electrical equipment relative dimensions standard in power station is obtained；Otherwise, then the last Substation Electric Equipment to be measured used and this are judged
Whether the secondary Substation Electric Equipment to be measured used is same model, if same model, is then directly made using last L
For this L, if not same model, then this is obtained by consulting the electrical equipment relative dimensions standard of transformer station to be measured
L.
Ultraviolet power equipment of the present invention measures the device of discharge fault true photon number, including：
Ultraviolet imager：For being imaged to corona discharge trouble point, primary light subnumber N is obtained；
Input module：For inputting ultraviolet passage Entry pupil diameters D, horizontal direction angle of visual field θ, horizontal direction sum of all pixels W,
Target electrical equipment diametric(al) actual size L；
Computing module：Target electrical equipment is straight where for identifying discharge fault point by images match recognizer
The corresponding number of pixels P in footpath 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.
Beneficial effect：The invention discloses a kind of method of ultraviolet power equipment measurement discharge fault true photon number and dress
Put, method is simple, without using distance-measuring equipment, distance of the trouble point to be measured with respect to observation station just can be passively obtained in real time, and count
Calculate the true electric discharge number of photons of discharge fault point.There is practical significance the invention enables the number of photons numerical value detected, pass through letter
Single operation just can quickly obtain true electric discharge number of photons, can solve the problem that current ultraviolet imagery equipment in power fault analysis field
In the problem of be difficult to accurate quantitative analysis, contribute to the foundation and popularization of ultraviolet inspection directive/guide, preferably to safeguard transformer station's electricity
Gas equipment, ensures power grid security Effec-tive Function.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention 1 in detection model schematic diagram；
Fig. 2 is the method flow diagram in the embodiment of the present invention 1.
Embodiment
Embodiment 1：
Embodiment 1 discloses a kind of method that ultraviolet power equipment measures discharge fault true photon number, as shown in Fig. 2
The present embodiment is uses the ultraviolet imager for the first time, therefore this method comprises the following steps：
S11：Demarcate the following parameter of ultraviolet imager：Ultraviolet passage Entry pupil diameters D, horizontal direction angle of visual field θ, level side
To sum of all pixels W；Ultraviolet imager includes day blind ultraviolet passage and visible channel.
In step S11, horizontal direction angle of visual field θ and horizontal direction sum of all pixels W are demarcated by the following method：By purple
Outer imager is placed on turntable, by a branch of directional light comprising UV signal and visible light signal incident ultraviolet passage and visible ray
Passage, focuses rotating table after imaging and causes imaging point to be located at the left and right edge of image respectively, calculating obtains horizontal direction
Angle of visual field θ, afterwards recorded video check video level direction sum of all pixels W.For the general purple that door screen is hidden with center of in the market
Outer camera lens, ultraviolet passage Entry pupil diameters D is calculated by formula (1) and obtained：
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.
Target electrical equipment diametric(al) actual size L is by consulting the electrical equipment relative dimensions standard of transformer station to be measured
Obtain.
After the parameters for having demarcated ultraviolet imager, parameters are entered into location algorithm, pass through location algorithm
Optimize parameters.
S21：By ultraviolet imager alignment corona discharge trouble point, gain is adjusted to suitable gear, and according to target strength
Regulation focusing, if signal is stronger, can suitably adjust focusing and primary photon counting precision is improved to out-of-focus appearance, so pass through
Ultraviolet imager is imaged to corona discharge trouble point, obtains primary light subnumber N.
S31：The diametric(al) pair of target electrical equipment where identifying discharge fault point by images match recognizer
The number of pixels P answered.Afterwards, calculated value d ' of the ultraviolet imager apart from the distance of discharge fault point is obtained according to formula (2).Will meter
Calculation value d ' is compared with actual value d, by formula (3) optimized proportion coefficient k, 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 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
Electric fault point d distance, now detects primary light subnumber for N.
The known ultraviolet passage Entry pupil diameters of ultraviolet imager are D, the then ultraviolet channel receiving signal of ultraviolet imager area
For S, it can be obtained by round areal calculation formula：
Radiation signal is radiated with sphere to surrounding, and the signal that ultraviolet imager is received is the one of the sphere that distance is d
Part, when can calculate radius by geometric formula for d, the surface area of ball：
SBall=4 π d (7)
Compared to detecting distance, more than ultraviolet lens bore typically two orders of magnitude of difference, therefore ultraviolet mirror can be utilized
The spherical corona's area for the ultraviolet imager camera lens that head aperture area approximate signal is reached：
The relation of the number of photons received and actual number of photons is：
I.e.
Required, transformer station can typically select the electrical equipment of certain fixing model, including insulator, pressed according to transformer substation construction
Ring, wire, gold utensil etc., wherein, insulator is formed by stacking by multiple disk-like glass or pottery video disc, and grading ring is from as annular
The cross section of shape, wire and gold utensil is also circular, therefore from different azimuth observation, the diametric width of above electrical equipment exists
Image will not be deformed upon.This calculates that detecting distance provides condition for the present invention using electrical equipment diametric(al) width.When
Detection device is certain, known to detection target when, detecting distance can be calculated and obtained：
In formula (11), y ' is the image height of electrical equipment diametric(al) 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 diametric(al) actual size,
On the other hand, diameter correspondence image height y ' and focal length f ratio can be changed into again be imaged after the corresponding picture of diametric(al)
Relation between plain number P and ultraviolet imager horizontal direction angle of visual field θ and horizontal direction sum of all pixels W：
Therefore actual discharge number of photons can be changed into the formula related to diametric(al) image height y ＇：
By analyzing the diametric image height of electrical equipment in image, you can extrapolate the true electric discharge of the discharge fault point
Number of photons, it is to avoid detect the influence of number of photons to ultraviolet imager apart from d.
The point of discharge produced for position on non-circular device, can also be by artificially judging with it apart from close circle
Shape electrical equipment is so as to obtain its true electric discharge number of photons.
Embodiment 2：
Embodiment 2 discloses a kind of method that ultraviolet power equipment measures discharge fault true photon number, and the present embodiment is
The ultraviolet imager is used for the second time, it is not necessary to demarcated again, and the last transformer station to be measured electricity being directed to using this method
The model of gas equipment is identical with the model for the Substation Electric Equipment to be measured that this is directed to using this method, therefore this method includes
Following steps：
S12：By ultraviolet imager alignment corona discharge trouble point, gain is adjusted to suitable gear, and according to target strength
Regulation focusing, if signal is stronger, can suitably adjust focusing and primary photon counting precision is improved to out-of-focus appearance, so pass through
Ultraviolet imager is imaged to corona discharge trouble point, obtains primary light subnumber N.After obtaining primary light subnumber N, to primary photon
Number N carries out Kalman filtering.
S22：The diametric(al) 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 diametric(al) of target electrical equipment where identifying discharge position
The corresponding number of pixels P of the diametric(al) of target electrical equipment carries out Kalman filtering where discharge position.Afterwards, according to formula
(14) ultraviolet imager is calculated apart from discharge fault point apart from d '.
The one group of d ' and actual value d that is obtained with laser range finder is compared, with least square method by formula (15)
To proportionality coefficient k.Calculated value d " the values after correction formula (16) calculation optimization are used in subsequent applications.
D '=kd (15)
In formula (16), L is identical with the last L for using this method typing, and W, θ are and the last time uses what this method was demarcated
W, θ are 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 using this method demarcation.
Embodiment 3：
Present embodiment discloses the device that a kind of ultraviolet power equipment measures discharge fault true photon number, including：
Ultraviolet imager：For being imaged to corona discharge trouble point, primary light subnumber N is obtained；
Input module：For inputting ultraviolet passage Entry pupil diameters D, horizontal direction angle of visual field θ, horizontal direction sum of all pixels W,
Target electrical equipment diametric(al) actual size L；
Computing module：Target electrical equipment is straight where for identifying discharge fault point by images match recognizer
The corresponding number of pixels P in footpath direction, and according to the true electric discharge number of photons N of formula (18) calculating discharge fault point0：
Used for ease of actual production, the ultraviolet power equipment of the present embodiment measures the device of discharge fault true photon number
Input module and computing module are integrated in the ultraviolet imager.
Claims (10)
1. a kind of method that ultraviolet power equipment measures discharge fault true photon number, it is characterised in that：Comprise the following steps：
S1：Corona discharge trouble point is imaged by ultraviolet imager, primary light subnumber N is obtained；
S2：The corresponding picture of diametric(al) 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 passage Entry pupil diameters, and θ is the horizontal direction angle of visual field, and W is horizontal direction sum of all pixels, and L is target
Electrical equipment diametric(al) actual size.
2. the method that ultraviolet power equipment according to claim 1 measures discharge fault true photon number, it is characterised in that：
The ultraviolet imager includes day blind ultraviolet passage and visible channel, horizontal direction angle of visual field θ and horizontal direction sum of all pixels W
Demarcated by the following method：Ultraviolet imager is placed on turntable, by a branch of comprising UV signal and visible light signal
Directional light incident ultraviolet passage and visible channel, focus rotating table after imaging and cause imaging point to be located at image respectively
Left and right edge, calculating obtains horizontal direction angle of visual field θ, and recorded video checks video level direction sum of all pixels W afterwards.
3. the method that ultraviolet power equipment according to claim 1 measures discharge fault true photon number, it is characterised in that：
The ultraviolet passage Entry pupil diameters D is calculated by formula (2) and obtained：
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 that ultraviolet power equipment according to claim 1 measures discharge fault true photon number, it is characterised in that：
In the step S2, obtain after primary light subnumber N, primary light subnumber N is filtered, remove noise.
5. the method that ultraviolet power equipment according to claim 5 measures discharge fault true photon number, it is characterised in that：
Primary light subnumber N is filtered using Kalman filtering mode.
6. the method that ultraviolet power equipment according to claim 1 measures discharge fault true photon number, it is characterised in that：
In the step S3, after the corresponding number of pixels P of diametric(al) of target electrical equipment where identifying discharge fault point, enter
Row time-domain filtering, removes noise.
7. the method that ultraviolet power equipment according to claim 1 measures discharge fault true photon number, it is characterised in that：
In the step S3, the diametric(al) pair of target electrical equipment where identifying discharge fault point by images match recognizer
After the number of pixels P answered, calculated value d ' of the ultraviolet imager apart from the distance of discharge fault point is obtained according to formula (3), will be counted
Calculation value d ' is compared with actual value d, by formula (4) optimized proportion coefficient k, is reused after correction formula (5) optimized
Calculated value d "；
D '=kd (4)
8. the method that ultraviolet power equipment according to claim 1 measures discharge fault true photon number, it is characterised in that：
Target electrical equipment diametric(al) actual size L in the step S3 is determined by the following method：Judge whether it is for the first time
Using this method：If it is, target electrical equipment diametric(al) actual size L is by consulting the electrical equipment of transformer station to be measured
Relative dimensions standard is obtained；Otherwise, then the change to be measured that the last Substation Electric Equipment to be measured used is used with this is judged
Whether electric plant is same model, if same model, then directly using last L as this L, if
It is not same model, then obtains this L by consulting the electrical equipment relative dimensions standard of transformer station to be measured.
9. a kind of ultraviolet power equipment measures the device of discharge fault true photon number, it is characterised in that：Including：
Ultraviolet imager：For being imaged to corona discharge trouble point, primary light subnumber N is obtained；
Input module：For inputting ultraviolet passage Entry pupil diameters D, horizontal direction angle of visual field θ, horizontal direction sum of all pixels W, target
Electrical equipment diametric(al) actual size L；
Computing module：The diameter side of target electrical equipment where for 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. ultraviolet power equipment according to claim 9 measures the device of discharge fault true photon number, its feature exists
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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| CN107037335B (en) | 2019-06-11 |
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