CN107884164A - A kind of breaker spring method for testing performance of NCC SAR algorithms - Google Patents

A kind of breaker spring method for testing performance of NCC SAR algorithms Download PDF

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Publication number
CN107884164A
CN107884164A CN201710875570.9A CN201710875570A CN107884164A CN 107884164 A CN107884164 A CN 107884164A CN 201710875570 A CN201710875570 A CN 201710875570A CN 107884164 A CN107884164 A CN 107884164A
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spring
breaker
frame
msubsup
performance
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CN107884164B (en
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黄辉敏
夏小飞
苏毅
芦宇峰
王飞风
吕泽承
杨健
陈庆发
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Electric Power Research Institute Guangxi Power Grid Co Ltd
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Electric Power Research Institute Guangxi Power Grid Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00Testing of machine parts
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/20Analysis of motion
    • G06T7/223Analysis of motion using block-matching
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/60Analysis of geometric attributes
    • G06T7/66Analysis of geometric attributes of image moments or centre of gravity
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/70Determining position or orientation of objects or cameras
    • G06T7/73Determining position or orientation of objects or cameras using feature-based methods
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00Indexing scheme for image analysis or image enhancement
    • G06T2207/10Image acquisition modality
    • G06T2207/10016Video; Image sequence

Abstract

The invention discloses a kind of breaker spring method for testing performance of NCC SAR algorithms, it is related to the detection technique field of high-tension apparatus.The breaker spring method for testing performance of the NCC SAR algorithms, the motion conditions of spring during circuit-breaker switching on-off are caught by high speed camera, obtain thousands of frame image sequences, kinetic characteristic per circle spring is identified using NCC SAR algorithms, the assessment to testing spring performance is realized with reference to breaker spring Performance Evaluation function;The detection method of the present invention be non-contact detection method, without spring is disassembled carry out test can be to scene operating breaker spring progress live detection, solving spring fatigue tester needs to disassemble the problem of spring;The NCC SAR algorithms of the present invention are Adaptive Matching Algorithm, and not only accuracy of identification is high, anti-noise jamming ability is strong, is not influenceed by gray value linear transformation, and the speed of service is fast, improves spring performance on-line checking efficiency.

Description

A kind of breaker spring method for testing performance of NCC-SAR algorithms
Technical field
The invention belongs to the detection technique field of high-tension apparatus, more particularly to one kind to be based on the adaptive area of normalized crosscorrelation The open circuit of domain matching algorithm (Normalized Cross Correlation-Self Adjustment Region, NCC-SAR) Device spring performance detection method.
Background technology
Primary cut-out is the visual plant in power system, and protection of its operational reliability to power network is heavy to closing with control Will.Operating mechanism is one of core component for determining breaker performance, and wherein spring operating mechanism is to use most common actuating Mechanism, and its number of springs for being related to and type are more, thus in breaker spring reliability to equipment and power system Safe operation has material impact.With the extension of breaker Years Of Service, the spring in its internal operating mechanism occur fatigue, The problems such as aging, spring fatigue defect directly affect time and the speed of divide-shut brake, and the deterioration of spring performance can cause breaker Phenomena such as delay voltage or even miss operation, have a strong impact on the safe and stable operation of breaker.
At present, the detection to spring performance uses spring fatigue tester, and for the spring in breaker, due to spring It has been be fixedly mounted that, it is disassembled to be put in again in fatigue tester carry out test and be inconvenient, and disassembled the breaker of on-line operation Spring has very big potential safety hazard, without feasibility.
It is a kind of non-contact detection new method to obtain breaker spring performance based on computer vision technique.Pass through at a high speed The motion conditions of spring during cameras capture circuit-breaker switching on-off, thousands of frame image sequences are obtained, identify magnanimity high-resolution The speed of image object directly affects the practicality of method with precision.Normalized crosscorrelation (NCC) matching algorithm accuracy of identification height, Anti-noise jamming ability is strong, is not influenceed by gray value linear transformation, but its is computationally intensive, the speed of service is slow, therefore is ensureing to match On the premise of precision, the speed of service of optimization NCC algorithms is realized based on computer vision technique detection breaker spring performance Key.Finally utilize per kinetic characteristic data of the circle spring during divide-shut brake, substitute into breaker spring Performance Evaluation letter Number, realizes the assessment to spring performance.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of breaker spring method for testing performance of NCC-SAR algorithms, According to the identification region of known consecutive frame target location adjust automatically algorithm during spring movement, so as to navigate to new knowledge Other region, optimize NCC algorithms, improve recognition speed, the kinetic characteristic that every circle spring is obtained using identification is realized to breaker bullet The assessment of spring performance.
The present invention is that solve above-mentioned technical problem by the following technical solutions:A kind of open circuit of NCC-SAR algorithms Device spring performance detection method, the motion conditions of spring during circuit-breaker switching on-off are caught by high speed camera, obtained thousands of Frame image sequence, the kinetic characteristic per circle spring is identified using NCC-SAR algorithms, it is real with reference to breaker spring Performance Evaluation function Now to the assessment of test spring performance, following steps are specifically included:
(1) breaker spring performance detection special purpose device is installed, adjusting means parameter, catches circuit-breaker switching on-off process High speed image sequence, and start calculating analysis;
(2) start frame of spring movement is determined by gradation of image difference identification method, obtains the n frames after spring movement starts Image sequence;
(3) every circle spring is numbered using transversal intersection method, there are m circles spring and be used as target to be identified;
(4) adjust automatically in region i-th (i ∈ m) circle spring is identified, it is automatic in the position of previous frame according to target The identification region of next frame is adjusted, until obtaining all positions of the circle spring in n frame image sequences;
(5) step (4) is carried out to other circle springs successively, obtains kinetic characteristic of the m target in n two field pictures;
(6) the kinetic characteristic data of m circle springs are substituted into breaker spring Performance Evaluation function, with the functional value calculated Realize the assessment to spring performance.
Further, the breaker spring performance detecting system in the step (1) includes LED light source, high speed camera, phase Machine support, control main frame and the breaker spring performance detection software based on NCC-SAR algorithms being deployed in control main frame; High speed camera is arranged on by breaker spring overhead, regulation camera support height and angle by camera support, makes high speed camera Camera lens allows spring to be located at image centre perpendicular to breaker spring;The focal length and frame per second of high speed camera are adjusted, can Enough number of image frames are captured in the case where ensureing image resolution ratio;Start the breaker spring based on NCC-SAR algorithms Energy inspection software, captures high speed image sequence, starts the calculating analysis of above-mentioned steps (2) to (6).
Further, the gradation of image difference identification method in the step (2) is by all corresponding positions of adjacent two field pictures The pixel gray value put is subtracted each other, and pixel number of the statistics difference more than 20 is designated as w, if w exceedes given threshold (setting The 2% of the total pixel number of image is threshold value), then it is spring movement start frame to assert the frame, if n frames are obtained after starting in motion Image.
Further, the transversal intersection method in the step (3) is to use the NCC of routine integrally as target using spring Algorithm identifies spring position, then sets a straight line for running through spring from spring middle, and the straight line will be with every circle spring target There is an intersection point, every circle spring is numbered as 1,2 from top to bottom successively with this intersection point ..., m, and treated in this, as m Identify target;The problem of transversal intersection method can overcome every circle spring to be difficult to differentiate between because similar caused by identification.
Further, the step (4) is handed over first in the first two field picture using whole sub-picture as identification region with reference to transversal Point method identifies position of the i-th circle spring in the first two field picture, and p × q zonules rectangle using centered on the position is used as the The identification region of one frame;Behind the target location of the known frame of kth -1 (k-1 ∈ n, k ∈ n) and identification region, according to the fortune of target Dynamic speed calculates region displacement X=λ v+c, and wherein λ is proportionality coefficient, and v is movement velocity, and c is constant, automatic using Δ X After adjustment obtains the identification region of kth frame, the target image of kth frame is quickly and accurately searched in new identification region;With this Analogize, take frame to be identified successively until obtaining all positions of the i-th circle spring in n frame image sequences.
Further, the target kinetic characteristic in the step (5) includes coordinates of targets and target velocity.
Further, the breaker spring Performance Evaluation function in the step (6) is
Wherein, coordinate of the i-th circle spring in kth frame isSpeed isI-th with the adjacent turn springs of i+1 two in kth Pitch of turn in frame isThe foundation assessed the i-th circle spring performance is the circle spring in whole divide-shut brake Pitch of turn and speed in n frame image sequences,For the matching similarity score value of the i-th circle spring target in kth frame, i=1, 2 ..., m;K=1,2 ..., n;
Finally obtain the assessed value s of all circle spring performances1, s2..., sm, it is compared with given threshold, learns bullet The performance condition of spring and whether deterioration occurs.
Compared with prior art, the breaker spring method for testing performance of NCC-SAR algorithms provided by the present invention, passes through High speed camera catches the motion conditions of spring during circuit-breaker switching on-off, obtains thousands of frame image sequences, is calculated using NCC-SAR Kinetic characteristic of the method identification per circle spring, the assessment to testing spring performance is realized with reference to breaker spring Performance Evaluation function; The present invention detection method be non-contact detection method, without spring is disassembled carry out test can to scene it is operating break Road device spring carries out live detection, and solving spring fatigue tester needs to disassemble the problem of spring;The NCC-SAR of the present invention is calculated Method is Adaptive Matching Algorithm, and not only accuracy of identification is high, anti-noise jamming ability is strong, is not influenceed by gray value linear transformation, and And the speed of service is fast, spring performance on-line checking efficiency is improved.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, the required accompanying drawing used in being described below to embodiment It is briefly described, it should be apparent that, drawings in the following description are only one embodiment of the present of invention, general for this area For logical technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the breaker spring performance detection flow chart of NCC-SAR algorithms of the present invention;
Fig. 2 is breaker spring performance detection special purpose device structural representation of the present invention;
Fig. 3 is the schematic diagram that transversal intersection method of the present invention carries out spring number of turn numbering;
Fig. 4 is NCC-SAR algorithms region adjust automatically schematic diagram of the present invention;
Fig. 5 is the particular flow sheet of the breaker spring method for testing performance of NCC-SAR algorithms of the present invention.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the present invention is clearly and completely described, Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based in the present invention Embodiment, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made, Belong to the scope of protection of the invention.
As shown in Figure 1 and Figure 5, the breaker spring method for testing performance of NCC-SAR algorithms of the invention, passes through high speed phase Machine catches the motion conditions of spring during circuit-breaker switching on-off, obtains thousands of frame image sequences, is identified using NCC-SAR algorithms Per the kinetic characteristic of circle spring, the assessment to testing spring performance is realized with reference to breaker spring Performance Evaluation function, with ZN65- Exemplified by 12 type primary cut-out separating brake processes, specific implementation comprises the following steps:
(1) breaker spring performance detection special purpose device is installed, as shown in Fig. 2 breaker spring performance detecting system bag Include LED light source, high speed camera, camera support, control main frame and be deployed in disconnected based on NCC-SAR algorithms in control main frame Road device spring performance inspection software;High speed camera is arranged on by breaker spring overhead by camera support, adjusts camera support Height and angle, make high speed camera camera lens perpendicular to breaker spring, and allow spring to be located at image centre;Adjusting frame per second is 3000 frames/second, focusing makes breaker spring clear;It is soft to start the breaker spring performance detection based on NCC-SAR algorithms Part, high speed image sequence is captured, start the calculating analysis of following step (2) to (6).
(2) start frame of spring movement is determined by gradation of image difference identification method, the resolution ratio of image in the present embodiment For 300 × 1000, then it is 6000 (the 2% of total pixel number is threshold value) that motion, which starts threshold value,.The figure caught to high speed camera The pixel gray value that picture carries out adjacent all correspondence positions of two field picture is subtracted each other, the statistics gray scale difference value pixel more than 20 Number, if more than 6000, regard as spring movement and start.N two field pictures are obtained after starting in motion.Breaker is before action starts Bulk redundancy image be present, motion start frame is picked out by gradation of image difference identification method, so as to reject redundant image, improve The detection method speed of service.
(3) every circle spring is numbered using transversal intersection method, routine is used integrally as target using spring first NCC algorithms identify spring position, then do a straight line for running through spring from spring middle, and the straight line will be with every circle spring mesh Mark has an intersection point, every circle spring is numbered as 1,2 from top to bottom successively with this intersection point ..., m, and in this, as m Target to be identified, as shown in Figure 3.The bottom of spring is fixedly connected with pedestal in ZN65-12 type primary cut-outs, top and motion Connecting lever is connected, and the contractile motion of spring can drive the motion of connecting lever.Because every circle spring is all much like, image recognition algorithm energy Each circle spring is identified, but they can not be made a distinction, transversal intersection method can overcome every circle spring because similar and difficult The problem of being caused with Division identification.
(4) adjust automatically in region i-th (i ∈ m) circle spring is identified, with whole secondary figure first in the first two field picture As being used as identification region, position of the i-th circle spring in the first two field picture is identified with reference to transversal intersection method, using the position in Identification region of 100 × 200 zonule rectangles of the heart as the first frame.Coordinate of the i-th circle spring target in the frame of kth -1 beSpeed is(i=1,2 ..., m;K=1,2 ...,Region displacement is obtained by formula Δ X=λ v+cλ=0.2, c=3 are taken in the present embodiment.Utilize region displacementAdjust automatically identification region obtains The identification region of kth frame, as shown in Figure 4.UtilizeAfter adjusting identification region, quickly and accurately searched in new identification region Target image of the rope to kth frameBy that analogy, frame is taken to be identified successively, until obtaining the i-th circle spring in n two field picture sequences All positions in row.This NCC-SAR algorithms improve the search speed and precision of target from identification region.
(5) NCC-SAR algorithms are used to the m circles spring of spring, repeats (4) step, m target of identification is in n two field pictures Kinetic characteristic, including movement position and speed, identification obtains coordinate of the m target in n two field pictures and is Speed is
(6) utilize m target position coordinates in n two field pictures, calculate pitch of turn of the two adjacent turn springs in certain frame, note the Pitch of turn of the adjacent turn springs of i and i+1 two in kth frame be(i=1,2 ..., m;K=1,2 ..., n;Definition), using this calculate pitch of turn of the m circles spring in n two field pictures asTo the i-th circle spring The foundation that performance is assessed is pitch of turn and speed of the circle spring in whole divide-shut brake n frame image sequences, the i-th circle spring Breaker spring Performance Evaluation function is
In formula,(i=1,2 ..., m;K=1,2 ..., n) be i-th circle spring target in kth frame matching similarity Score value, the Performance Evaluation value of m circle springs is calculated as s using thus formula1, s2..., sm;siRepresent the performance of the i-th circle spring, siMore It is big to represent that spring fatigue problem is more serious, performance is poorer, siSmaller expression spring fatigue problem is lighter, performance is better.Most at last si Compared with given threshold, then the assessment to breaker spring performance can be achieved.
Above disclosed is only the embodiment of the present invention, but protection scope of the present invention is not limited thereto, Any one skilled in the art the invention discloses technical scope in, can readily occur in change or modification, all It should be included within the scope of the present invention.

Claims (7)

1. a kind of breaker spring method for testing performance of NCC-SAR algorithms, it is characterised in that comprise the following steps:
(1) breaker spring performance detecting system, adjusting means parameter, the high speed image of seizure circuit-breaker switching on-off process are installed Sequence, and start calculating analysis;
(2) start frame of spring movement is determined by gradation of image difference identification method, obtains the n two field pictures after spring movement starts Sequence;
(3) every circle spring is numbered using transversal intersection method, there are m circles spring and be used as target to be identified;
(4) adjust automatically in region the i-th circle spring is identified, according to target previous frame position adjust automatically next frame Identification region, until obtain all positions of the circle spring in n frame image sequences;
(5) step (4) is carried out to other circle springs successively, obtains kinetic characteristic of the m target in n two field pictures;
(6) the kinetic characteristic data of m circle springs are substituted into breaker spring Performance Evaluation function, realized with the functional value calculated Assessment to spring performance.
2. breaker spring method for testing performance as claimed in claim 1, it is characterised in that the open circuit in the step (1) Device spring performance detecting system includes LED light source, high speed camera, camera support, control main frame and is deployed in control main frame The breaker spring performance detection software based on NCC-SAR algorithms;High speed camera is arranged on by breaker by camera support Spring overhead, regulation camera support height and angle, make high speed camera camera lens perpendicular to breaker spring, and allow spring positioned at figure As centre;Adjust the focal length and frame per second of high speed camera.
3. breaker spring method for testing performance as claimed in claim 1, it is characterised in that the image in the step (2) Gray scale difference value identification method is to be subtracted each other the pixel gray value of all correspondence positions of adjacent two field pictures, and statistics difference is more than 20 pixel number is designated as w, if w exceedes given threshold, it is spring movement start frame to assert the frame, if motion is common after starting Obtain n two field pictures.
4. breaker spring method for testing performance as claimed in claim 1, it is characterised in that the transversal in the step (3) Intersection method is to identify spring position using the NCC algorithms of routine, then set one from spring middle integrally as target using spring Root runs through the straight line of spring, and the straight line will have an intersection point with every circle spring target, with this intersection point successively from top to bottom to every Circle spring is numbered as 1,2 ..., m, and in this, as m targets to be identified.
5. breaker spring method for testing performance as claimed in claim 1, it is characterised in that the step (4) is first first Using whole sub-picture as identification region in two field picture, identify the i-th circle spring in the first two field picture with reference to transversal intersection method Position, the identification region of p × q zonules rectangle using centered on the position as the first frame;When the target position of the known frame of kth -1 Put and identification region after, region displacement X=λ v+c are calculated according to the movement velocity of target, wherein λ is proportionality coefficient, and v is Movement velocity, c are constant, quick in new identification region, accurate after obtaining the identification region of kth frame using Δ X adjust automaticallies Ground searches the target image of kth frame;By that analogy, frame is taken to be identified successively until obtaining the i-th circle spring in n two field picture sequences All positions in row.
6. breaker spring method for testing performance as claimed in claim 1, it is characterised in that the target in the step (5) Kinetic characteristic includes coordinates of targets and target velocity.
7. breaker spring method for testing performance as claimed in claim 1, it is characterised in that the open circuit in the step (6) Device spring performance valuation functions are
<mrow> <msub> <mi>s</mi> <mi>i</mi> </msub> <mo>=</mo> <msqrt> <mrow> <msubsup> <mi>r</mi> <mi>i</mi> <mn>1</mn> </msubsup> <msup> <mrow> <mo>(</mo> <mfrac> <msubsup> <mi>d</mi> <mi>i</mi> <mn>1</mn> </msubsup> <msubsup> <mi>v</mi> <mi>i</mi> <mn>1</mn> </msubsup> </mfrac> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>+</mo> <msubsup> <mi>r</mi> <mi>i</mi> <mn>2</mn> </msubsup> <msup> <mrow> <mo>(</mo> <mfrac> <msubsup> <mi>d</mi> <mi>i</mi> <mn>2</mn> </msubsup> <msubsup> <mi>v</mi> <mi>i</mi> <mn>2</mn> </msubsup> </mfrac> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>+</mo> <mn>...</mn> <mo>+</mo> <msubsup> <mi>r</mi> <mi>i</mi> <mi>n</mi> </msubsup> <msup> <mrow> <mo>(</mo> <mfrac> <msubsup> <mi>d</mi> <mi>i</mi> <mi>n</mi> </msubsup> <msubsup> <mi>v</mi> <mi>i</mi> <mi>n</mi> </msubsup> </mfrac> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> </msqrt> </mrow>
Wherein, coordinate of the i-th circle spring in kth frame isSpeed isI-th with the adjacent turn springs of i+1 two in kth frame Pitch of turn beThe foundation assessed the i-th circle spring performance is the circle spring in whole divide-shut brake n frame figures As the pitch of turn and speed in sequence, ri kFor the matching similarity score value of the i-th circle spring target in kth frame, i=1,2 ..., m;k =1,2 ..., n;
Finally obtain the assessed value s of all circle spring performances1, s2..., sm, they are compared with given threshold, learns spring Performance condition and whether deterioration occurs.
CN201710875570.9A 2017-09-25 2017-09-25 A kind of breaker spring method for testing performance of NCC-SAR algorithm Active CN107884164B (en)

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CN109060285A (en) * 2018-09-10 2018-12-21 西安交通大学 A kind of detection device and method of helical spring dynamic vibration characteristics

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