CN107860562B - A kind of high-voltage circuitbreaker operation spring weakness test method - Google Patents
A kind of high-voltage circuitbreaker operation spring weakness test method Download PDFInfo
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Abstract
The invention discloses a kind of high-voltage circuitbreakers to operate spring weakness test method, is related to high-tension apparatus the field of test technology.The high-voltage circuitbreaker operates spring weakness test method, spring movement situation image sequence is obtained by high speed camera, multi-targets recognition and tracking are carried out to image sequence using NCC-SAR algorithm, to obtain a variety of mechanical property parameters of characterization spring fatigue state, spring deformation is detected during realizing the normal divide-shut brake of high-voltage circuitbreaker；The present invention carries out spring flaccid state using high speed image method of identification and carries out contactless monitoring, without disassembling spring, has live operability and feasibility；NCC-SAR algorithm identifies image sequence, tracked and is handled, and accuracy of identification is high, anti-noise jamming ability is not influenced by gray value linear transformation by force,.
Description
Technical field
The invention belongs to high-tension apparatus the field of test technology more particularly to a kind of operation spring weakness tests of high-voltage circuitbreaker
Method.
Background technique
High-voltage circuitbreaker operational reliability is most important to the protection and control of power grid, is in normal work static
State, operation or accident act rapidly when occurring, and are switched off or on power supply, thus have higher want to its actuating performance and reliability
It asks.According to statistics, in high-voltage circuitbreaker accident, operating mechanism failure accounts for the 64.8% of whole failures, wherein the mechanical event of operating mechanism
Barrier accounts for the 43.8% of whole failures, and the failure of spring weakness is the one of the major reasons for leading to mechanism-trouble in operating mechanism.Behaviour
The performance superiority and inferiority of motivation structure spring members directly affects the divide-shut brake ability of breaker, since spring long-play weakness causes
Accident caused by fracture is commonplace, therefore carries out research with very important meaning to the detection technique of operating mechanism spring
Justice.
In compression or the fluctuating load working condition stretched in breaker, long-time service inevitably goes out spring
Phenomena such as existing weakness aging, deformation are even broken, the operation spring being on active service especially for some early stages has started to be broken
Phenomenon constitutes serious potential threat to the safe operation of power grid.For the fracture of preventing broken circuit device spring, need regular to spring
Inspection, but when not disassembling spring, the flaccid state of spring can not only be judged with artificial tour, at present bullet
The test of spring flaccid state also only may be implemented in breaker overhaul, and there are no find a kind of workable detection in ideal scene
Technological means whether breaker spring works normally.
Currently, there is the powerful specialized vendor of many technical strength to produce spring fatigue tester both at home and abroad, but for
Spring in breaker disassembles it and is put in the test of weak testing machine again and is inconvenient, and disassemble since spring has been fixedly mounted
The breaker spring of on-line operation has very big security risk, can operate without scene and feasibility.For the bullet in breaker
Spring flaccid state, the rare test method using computer vision technique, and existing a small amount of research is only limitted to bullet in laboratory
The face crack feature of spring, and lack the research of the characteristics such as stress, deformation during entire divide-shut brake to breaker spring, therefore
Breaker can not be disassembled and carry out accurate test spring rate test, it is even more impossible to effective evaluation spring flaccid states.
In terms of breaker mechanical parameter acquisition: for a long time, no matter in external or at home, breaker mechanic property
Tester detects moving contact using linear displacement transducer, grating sensor, conductive plastic potentiometer and angular displacement sensor etc.
Displacement and movement velocity, these sensor connecting pieces are installed on operating mechanism or main shaft, and not only sensor resolution ratio itself is not
Height, and gap present in installation affects precision.Meanwhile different model breaker size is different, the fixture of sensor is different,
Installation process is excessively cumbersome, and working efficiency is low.Moving contact is very limited for installation displacement sensor space nearby, traditional
Or the limitation due to size, by more and more difficult.This touch sensor not only installation fee when, it is laborious, but also effect is installed
Fruit directly affects the accuracy of test.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of high-voltage circuitbreaker operation spring weakness test method.
The present invention is to solve above-mentioned technical problem by the following technical solutions: a kind of high-voltage circuitbreaker operates spring
Weak test method, including following testing procedure:
(1) setting high-voltage circuitbreaker operates the control parameter of spring fatigue state verification system, grasps in circuit-breaker switching on-off
Setting high speed camera shooting focal length, the triggering parameters such as speed and camera frame per second, resolution ratio and time for exposure before making, and according to open circuit
Type number and branch wire time determine camera high-speed capture time span parameter；
(2) high-voltage circuitbreaker operation spring fatigue state verification system issues circuit-breaker switching on-off and controls signal, and starting is disconnected
Road device realizes divide-shut brake process, and stretching or compressive deformation occur for band pneumatic operating mechanism spring, until (high speed is completed in divide-shut brake movement
Camera shooting time is greater than the operating mechanism spring deformation time)；
(3) the high speed image sequence for capturing telescopic variation in breaker spring surface image and division brake test, for
Every frame image, which uses, is based on normalized crosscorrelation adaptive region matching algorithm (Normalized Cross Correlation-
Self Adjustment Region, NCC-SAR) multiple target on spring is identified and tracked；Spring division is acquired simultaneously
The delta data of spring pressure during lock；
(4) multiple target point of NCC-SAR algorithm keeps track image sequence is depicted as deformation-time graph, calculate spring by
Mechanical deformation characterisitic parameter (spring works height and pitch, movement travel, telescopic spring time, maximum in power telescopic process
Acceleration, largest deformation amount and mesosphere radial direction reciprocal time)；
(5) the high speed image sequence of acquisition and mechanical property parameter are analyzed and are handled, and by processing result with
Spring evaluation of running status data are compared in basic database and empirical rule database, judge spring flaccid state and
Defect level；
NCC-SAR algorithm in the step (3) the following steps are included:
(3.1) industrial camera is adjusted to suitable frame per second, focal length and field angle, captures spring during circuit-breaker switching on-off
Motion conditions obtain magnanimity high speed image sequence；
(3.2) method successively decreased using continuous adjacent frame image pixel gray level determines movement start frame and end frame, rejects
Unrelated frame image avoids bulk redundancy image contributions processing speed before and after breaker operator；
(3.3) image after start frame is pre-processed, reduces live light variation and camera electronic noise to figure
The interference of picture；Suitable area-of-interest (region of interest, ROI) is set simultaneously, reduces target search area
And the interference outside ROI can be excluded；
(3.4) using entire image as identification region in first frame image, the i-th circle bullet is identified in conjunction with transversal intersection method
Position (i ∈ m, i, m be spring the number of turns) of the spring in first frame image, the zonule p × q rectangle (p, q centered on the position
For rectangular zone width value) identification region as first frame；It is special using normalized crosscorrelation matching algorithm (NCC) identification spring
It sets the goal, behind the target position of known -1 frame of kth (k-1 ∈ n, k ∈ n, k, n are image sequence frame number) and identification region, root
Region displacement X=λ v+c is calculated according to the movement velocity of target, wherein λ is proportionality coefficient, and v is movement velocity, and c is constant；
After obtaining the identification region of kth frame using Δ X adjust automatically, the mesh of kth frame is quickly and accurately searched in new identification region
Logo image；And so on, successively take frame to carry out identification until obtaining all positions of the i-th circle spring in n frame image sequence；
(3.5) identification coordinates of targets is carried out to subsequent frame image to calculate, and judge whether coordinates of targets continues to change, such as pass through
It crosses coordinate and varies to constant, be determined as end frame, if not end frame, then ROI is readjusted according to coordinates of targets, removed
One frame repeats step (3.5)；
(3.6) if it is end frame, multiple characteristic targets on breaker spring is tracked and identified, the movement of multiple target is obtained
Characterisitic parameter；Accurate target motion result parameter is calculated using multiple target linkage weighted discrimination method again.
Further, the high-voltage circuitbreaker operation spring fatigue state verification system in the step (1) and (2) includes hard
Part part and software section, the hardware components include main control module industry control work station, capture card, image transmission module and
Communication interface and display module, the main control module industry control work station by bus respectively with described image transmission module, adopt
Truck, communication interface and display module connection；Described image transmission module, for obtaining the high speed image of high speed camera acquisition
Sequence, and it is transferred to main control module industry control work station, the capture card is described logical for obtaining the data of sensor acquisition
Communication interface, for carrying out communication connection, the display module, for parameter and display knot to be arranged with high speed camera or sensor
Fruit；The software section includes test process control and Comprehensive Analysis Software and spring state recognition software, and the system is in hardware
Support under realize breaker spring test process control, data acquisition and spring state identification.
Further, the multiple target linkage weighted discrimination method in the step (3.6) passes through adjacent two field pictures gray scale difference
Threshold value rejects bad data affected by environment and misidentifies caused error result, and according to the matching similarity of target point
Value determines their shared weights in the result, so as to occupy weight in the result bigger for the higher target of similarity.
Further, the analysis and processing method of mechanical deformation characterisitic parameter is by mechanical deformation characteristic in the step (5)
Parameter carries out similarity with the data sample in basic database and compares, and mechanical graphics deformation behavior parameter changes with spring travel
Curve, seek curve consecutive points slope, generate and compare two-dimensional array, reconstruct two-dimensional feature vector using frequency-domain transform, will wrap
Characteristics of low-frequency vector containing contour feature seeks Euclidean distance, forms believable spring deformation variation and quantifies serial criterion, thus
Effectively spring flaccid state and defect level are evaluated.
Compared with prior art, high-voltage circuitbreaker provided by the present invention operates spring weakness test method, passes through high speed
Camera obtains spring movement situation image sequence, carries out multi-targets recognition and tracking to image sequence using NCC-SAR algorithm, from
And a variety of mechanical property parameters of characterization spring fatigue state are obtained, realize spring shape during the normal divide-shut brake of high-voltage circuitbreaker
Become detection；The present invention carries out spring flaccid state using high speed image method of identification and carries out contactless monitoring, without disassembling spring,
With live operability and feasibility；NCC-SAR algorithm identifies image sequence, tracked and is handled, accuracy of identification
High, anti-noise jamming ability is influenced by gray value linear transformation by force, not, and under the premise of guaranteeing matching precision, according to knowledge
NCC-SAR algorithm after the optimization of other region adjust automatically, identifies the kinetic characteristic of every circle spring, excellent compared to traditional NCC algorithm
The speed of service, the flaccid state of more efficient, accurate assessment spring are changed.
Specific embodiment
The technical solution in the present invention is clearly and completely described below, it is clear that described embodiment is only
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative labor, shall fall within the protection scope of the present invention.
A kind of high-voltage circuitbreaker provided by the present invention operates spring weakness test method, including following testing procedure:
(1) setting high-voltage circuitbreaker operates the control parameter of spring fatigue state verification system, grasps in circuit-breaker switching on-off
Setting high speed camera shooting focal length, the triggering parameters such as speed and camera frame per second, resolution ratio and time for exposure before making, and according to open circuit
Type number and branch wire time determine camera high-speed capture time span parameter；
(2) high-voltage circuitbreaker operation spring fatigue state verification system issues circuit-breaker switching on-off and controls signal, and starting is disconnected
Road device realizes divide-shut brake process, i.e., the breaking divide-shut brake coil of control, which is passed through electric current, makes circuit breaker operation mechanism start to act, and is driven
Mechanism and connecting rod band moving contact move, so that stretching or compressive deformation occurs with pneumatic operating mechanism spring, until divide-shut brake acts
Complete (high speed camera shooting time is greater than the operating mechanism spring deformation time)；
(3) the high speed image sequence for capturing telescopic variation in breaker spring surface image and division brake test, for
Every frame image, which is used, to be identified and is tracked to multiple target on spring based on NCC-SAR algorithm；Spring is acquired by force snesor
The delta data of spring pressure during divide-shut brake reflects stress condition when spring deformation；
(4) multiple target point of NCC-SAR algorithm keeps track image sequence is depicted as deformation-time graph, calculate spring by
Mechanical deformation characterisitic parameter (spring works height and pitch, movement travel, telescopic spring time, maximum in power telescopic process
Acceleration, largest deformation amount and mesosphere radial direction reciprocal time)；
(5) the high speed image sequence of acquisition and mechanical property parameter are analyzed and are handled, and by processing result with
Spring evaluation of running status data are compared in basic database and empirical rule database, judge spring flaccid state and
Defect level.
High-voltage circuitbreaker operation spring fatigue state verification system in step (1) and (2) includes hardware components and software
Part, hardware components include main control module industry control work station, capture card, image transmission module and communication interface and display mould
Block, main control module industry control work station by bus respectively with image transmission module, capture card, communication interface and display module
Connection；Image transmission module for obtaining the high speed image sequence of high speed camera acquisition, and is transferred to main control module industry control work
It stands, capture card, for obtaining the data of sensor acquisition, communication interface, for being communicated with high speed camera or sensor
Connection, display module, for parameter and display result to be arranged；Software section include test process control and Comprehensive Analysis Software and
Spring state recognition software, the system realize the control of breaker spring test process, data acquisition and bullet under the support of hardware
Spring state identification.
NCC-SAR algorithm in step (3) the following steps are included:
(3.1) industrial camera is adjusted to suitable frame per second, focal length and field angle, captures spring during circuit-breaker switching on-off
Motion conditions obtain magnanimity high speed image sequence；
(3.2) method successively decreased using continuous adjacent frame image pixel gray level determines movement start frame and end frame, rejects
Unrelated frame image avoids bulk redundancy image contributions processing speed before and after breaker operator；
(3.3) image after start frame is pre-processed, reduces live light variation and camera electronic noise to figure
The interference of picture；Suitable area-of-interest (region of interest, ROI) is set simultaneously, reduces target search area
And the interference outside ROI can be excluded；
(3.4) using entire image as identification region in first frame image, the i-th circle bullet is identified in conjunction with transversal intersection method
Position (i ∈ m, i, m be spring the number of turns) of the spring in first frame image, the zonule p × q rectangle (p, q centered on the position
For rectangular zone width value) identification region as first frame；It is special using normalized crosscorrelation matching algorithm (NCC) identification spring
It sets the goal, behind the target position of known -1 frame of kth (k-1 ∈ n, k ∈ n, k, n are image sequence frame number) and identification region, root
Region displacement X=λ v+c is calculated according to the movement velocity of target, wherein λ is proportionality coefficient, and v is movement velocity, and c is constant；
After obtaining the identification region of kth frame using Δ X adjust automatically, the mesh of kth frame is quickly and accurately searched in new identification region
Logo image；And so on, successively take frame to carry out identification until obtaining all positions of the i-th circle spring in n frame image sequence；
(3.5) identification coordinates of targets is carried out to subsequent frame image to calculate, and judge whether coordinates of targets continues to change, such as pass through
It crosses coordinate and varies to constant, be determined as end frame, if not end frame, then ROI is readjusted according to coordinates of targets, removed
One frame repeats step (3.5)；
(3.6) if it is end frame, multiple characteristic targets on breaker spring is tracked and identified, the movement of multiple target is obtained
Characterisitic parameter；Accurate target motion result parameter is calculated using multiple target linkage weighted discrimination method again.
Transversal intersection method in step (3.4) is to identify bullet using conventional NCC algorithm using spring as a whole as target
Spring position, then the straight line for running through spring is set from spring middle, which will have an intersection point with every circle spring target,
Successively every circle spring is numbered as 1,2 from top to bottom with this intersection point ..., m, and in this, as m targets to be identified；Transversal
Intersection method can overcome the problems, such as that every circle spring is difficult to differentiate between identification because similar and causes.
Multiple target linkage weighted discrimination method in step (3.6) is rejected by adjacent two field pictures gray difference threshold by ring
The bad data and misidentify caused error result that border influences, and determine that they are being tied according to the matching similarity score value of target
Shared weight in fruit, so as to occupy weight in the result bigger for the higher target of similarity.
The analysis and processing method of mechanical deformation characterisitic parameter is by mechanical deformation characterisitic parameter and basic data in step (5)
Data sample in library carries out similarity comparison, and the curve that mechanical graphics deformation behavior parameter changes with spring travel seeks song
Line consecutive points slope generates and compares two-dimensional array, reconstructs two-dimensional feature vector using frequency-domain transform, will include the low of contour feature
Frequency feature vector seeks Euclidean distance, forms believable spring deformation variation and quantifies serial criterion, thus effectively tired to spring
Soft state and defect level are evaluated.
Above disclosed is only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, can readily occur in variation or modification,
It is covered by the protection scope of the present invention.
Claims (4)
1. a kind of high-voltage circuitbreaker operates spring weakness test method, which is characterized in that including following testing procedure:
(1) setting high-voltage circuitbreaker operates the control parameter of spring fatigue state verification system, before circuit-breaker switching on-off operation
High speed camera shooting focal length, triggering speed and camera frame per second, resolution ratio and time for exposure are set, and according to breaker model and divided
Closing time determines camera high-speed capture time span parameter；
(2) high-voltage circuitbreaker operation spring fatigue state verification system issues circuit-breaker switching on-off and controls signal, starts breaker
Realize divide-shut brake process, stretching or compressive deformation occur for band pneumatic operating mechanism spring, complete until divide-shut brake acts；
(3) the high speed image sequence for capturing telescopic variation in breaker spring surface image and division brake test, for every frame
Image, which is used, to be identified and is tracked to multiple target on spring based on NCC-SAR algorithm；During acquiring spring divide-shut brake simultaneously
The delta data of spring pressure；
(4) multiple target point of NCC-SAR algorithm keeps track image sequence is depicted as deformation-time graph, calculates spring stress and stretches
Mechanical deformation characterisitic parameter in compression process；
(5) the high speed image sequence of acquisition and mechanical property parameter are analyzed and are handled, and by processing result and basis
Spring evaluation of running status data are compared in database and empirical rule database, judge spring flaccid state and defect
Degree；
NCC-SAR algorithm in the step (3) the following steps are included:
(3.1) industrial camera is adjusted to suitable frame per second, focal length and field angle, captures spring movement during circuit-breaker switching on-off
Situation obtains magnanimity high speed image sequence；
(3.2) method successively decreased using continuous adjacent frame image pixel gray level determines movement start frame and end frame, rejects unrelated
Frame image avoids bulk redundancy image contributions processing speed before and after breaker operator；
(3.3) image after start frame is pre-processed, reduces live light variation and camera electronic noise to image
Interference；Suitable ROI is set simultaneously, reduces target search area and the interference outside ROI can be excluded；
(3.4) using entire image as identification region in first frame image, identify that the i-th circle spring exists in conjunction with transversal intersection method
Position in first frame image, the identification region of the zonule p × q rectangle using centered on the position as first frame；Utilize NCC
Algorithm identifies spring specific objective, after target position and the identification region of known -1 frame of kth, according to the movement velocity meter of target
Region displacement X=λ v+c is calculated, wherein λ is proportionality coefficient, and v is movement velocity, and c is constant；It is obtained using Δ X adjust automatically
After the identification region of kth frame, the target image of kth frame is quickly and accurately searched in new identification region；And so on, according to
It is secondary that frame is taken to carry out identification until obtaining all positions of the i-th circle spring in n frame image sequence；
(3.5) identification coordinates of targets is carried out to subsequent frame image to calculate, and judge whether coordinates of targets continues to change, such as by sitting
Mark varies to constant, is determined as end frame, if not end frame, then readjusts ROI according to coordinates of targets, takes next frame,
It repeats step (3.5)；
(3.6) if it is end frame, multiple characteristic targets on breaker spring is tracked and identified, the kinetic characteristic of multiple target is obtained
Parameter；Accurate target motion result parameter is calculated using multiple target linkage weighted discrimination method again.
2. high-voltage circuitbreaker as described in claim 1 operates spring weakness test method, which is characterized in that the step (1)
(2) the high-voltage circuitbreaker operation spring fatigue state verification system in includes hardware components and software section, the Hardware Subdivision
Divide includes main control module industry control work station, capture card, image transmission module and communication interface and display module, the master control
Molding block industry control work station is connected with described image transmission module, capture card, communication interface and display module respectively by bus
It connects；Described image transmission module for obtaining the high speed image sequence of high speed camera acquisition, and is transferred to main control module industry control
Work station, the capture card, for obtaining the data of sensor acquisition, the communication interface is used for and high speed camera or sensing
Device carries out communication connection, the display module, for parameter and display result to be arranged；The software section is program-controlled including testing
System and Comprehensive Analysis Software and spring state recognition software, the system realize breaker spring test process under the support of hardware
Control, data acquisition and spring state identification.
3. high-voltage circuitbreaker as described in claim 1 operates spring weakness test method, which is characterized in that the step
(3.6) the multiple target linkage weighted discrimination method in is rejected affected by environment bad by adjacent two field pictures gray difference threshold
Data and error result caused by misidentifying, and their shared power in the result are determined according to the matching similarity score value of target
Weight, so as to occupy weight in the result bigger for the higher target of similarity.
4. high-voltage circuitbreaker as described in claim 1 operates spring weakness test method, which is characterized in that the step (5)
The analysis and processing method of middle mechanical deformation characterisitic parameter is by the data sample in mechanical deformation characterisitic parameter and basic database
Similarity comparison is carried out, the curve that mechanical graphics deformation behavior parameter changes with spring travel seeks curve consecutive points slope, raw
At two-dimensional array is compared, two-dimensional feature vector is reconstructed using frequency-domain transform, the characteristics of low-frequency vector comprising contour feature is sought
Euclidean distance forms believable spring deformation variation and quantifies serial criterion, thus effectively to spring flaccid state and defect
Degree is evaluated.
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| CN108692929A (en) * | 2018-04-24 | 2018-10-23 | 西安工程大学 | The monitoring system and monitoring method of breaker closing energy-stored spring state |
| CN108921812B (en) * | 2018-05-11 | 2022-04-22 | 广西电网有限责任公司电力科学研究院 | Intelligent evaluation method for fatigue state of breaker spring based on image recognition |
| CN109060285B (en) * | 2018-09-10 | 2020-03-17 | 西安交通大学 | Device and method for detecting dynamic vibration characteristic of spiral spring |
| CN109166122A (en) * | 2018-09-18 | 2019-01-08 | 广西电网有限责任公司电力科学研究院 | Circuit breaker operation mechanism telescopic spring characteristic test method based on image procossing |
| CN111256980B (en) * | 2020-04-02 | 2022-03-22 | 广西电网有限责任公司电力科学研究院 | Circuit breaker energy storage spring performance detection method combining image and vibration signal |
| CN112157642B (en) * | 2020-09-16 | 2022-08-23 | 上海电机学院 | A unmanned robot that patrols and examines for electricity distribution room |
| CN112698196B (en) * | 2021-03-24 | 2021-06-08 | 深圳市三和电力科技有限公司 | High-voltage switch mechanical characteristic monitoring device |
| CN113791339A (en) * | 2021-07-19 | 2021-12-14 | 国网浙江省电力有限公司乐清市供电公司 | Circuit breaker performance state detection method based on R-NCC image recognition algorithm |
| CN115184785B (en) * | 2022-06-23 | 2024-05-07 | 苏州西门子电器有限公司 | Test method, test system and electronic equipment |
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