CN104849654A - Method for online monitoring breaker - Google Patents
Method for online monitoring breaker Download PDFInfo
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- CN104849654A CN104849654A CN201510167397.8A CN201510167397A CN104849654A CN 104849654 A CN104849654 A CN 104849654A CN 201510167397 A CN201510167397 A CN 201510167397A CN 104849654 A CN104849654 A CN 104849654A
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- isolating switch
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Abstract
The invention relates to a method for online monitoring a breaker. The method online monitors the breaker in real time by acquiring a thermal image of the breaker and analyzing the thermal image to determine the state of the breaker. It is prevented to determine the state of the breaker by manually reading the images such that a large number of manpower resources are saved. The method comprises steps of: extracting and compensating key areas of the thermal image of the breaker; obtaining a characteristic data matrix according to calculation; performing comparison to obtain first compared result data and second compared result data; performing weighted summation and calculation on the result data in order to obtain calculated result data; and finally determining the state of the breaker. The compensation for the key areas may effectively eliminate an environmental influence on the thermal image in order that a more accurate thermal image can be acquired. Characteristic extraction is performed on the compensated thermal image to obtain the more accurate characteristic data matrix and a more accurate determined result is obtained through comparison and determination, thereby improving online monitoring reliability and further improving the reliability of a power system.
Description
Technical field
The present invention relates to power equipment monitoring technical field, particularly relate to circuit breaker online monitoring method and system.
Background technology
Isolating switch is the key equipment in electric system, and isolating switch functional reliability is directly connected to the safety of whole electric system, thus is necessary to the monitoring of circuit-breaker status.At present, of a great variety to the monitoring equipment of isolating switch monitoring, it is generally sensor installation on-board the circuit breaker, or by sensor integration on-board the circuit breaker, the work state information of isolating switch is obtained by the monitoring of complexity, difference due to isolating switch model makes these monitoring equipment poor universality, and installs monitoring equipment to the isolating switch come into operation, and causes certain damage to isolating switch.
Along with the development of image technique, mainly by thermal imaging, circuit-breaker status is monitored.Thermal imaging is the infrared picture by taking thermal objects, these infrared picture analyses is obtained to the technology of useful information, judges according to the state of the useful information obtained to isolating switch.At present, most of thermal imaging system adopts the artificial mode reading picture judged result again to work, and need a large amount of human resources, or only read the temperature of certain panel region, do not adopt effective image computing method to analyze infrared picture, monitoring reliability is not high.
Summary of the invention
Based on this, be necessary for the not high problem of isolating switch monitoring reliability, a kind of circuit breaker online monitoring method and the system that improve monitoring reliability are provided.
A kind of circuit breaker online monitoring method, comprises the steps:
Gather breaker thermal image;
According to the positional information of described breaker thermal image and predetermined critical area, extract non-critical areas and critical area;
The critical area of described breaker thermal image is compensated;
The characteristic matrix that feature calculation obtains described isolating switch is carried out to the critical area of the described breaker thermal image after compensation;
Characteristic matrix in the characteristic matrix of described isolating switch and knowledge base is contrasted, obtains the first comparing result data; The characteristic matrix of described isolating switch and the history feature data matrix of described isolating switch are analyzed, obtain the second comparing result data; Characteristic matrix in described knowledge base comprises the characteristic matrix with other isolating switchs of described isolating switch same model;
Described first comparing result data and described second comparing result data are weighted read group total, obtain calculation result data;
According to described calculation result data, judge the state of described isolating switch.
The present invention also provides a kind of isolating switch on-line monitoring system, comprising:
Acquisition module, for gathering breaker thermal image;
Extraction module, for the positional information according to described breaker thermal image and predetermined critical area, extracts non-critical areas and critical area;
Compensating module, for compensating the critical area of described breaker thermal image;
First computing module, for carrying out to the critical area of the described breaker thermal image after compensation the characteristic matrix that feature calculation obtains described isolating switch;
Contrast module, for being contrasted by the characteristic matrix in the characteristic matrix of described isolating switch and knowledge base, obtains the first comparing result data; Also for the characteristic matrix of described isolating switch and the history feature data matrix of described isolating switch being analyzed, obtain the second comparing result data; Characteristic matrix in described knowledge base comprises the characteristic matrix with other isolating switchs of described isolating switch same model;
Second computing module, for described first comparing result data and described second comparing result data are weighted read group total, obtains calculation result data;
Processing module, for according to described calculation result data, judges the state of described isolating switch.
Above-mentioned circuit breaker online monitoring method, by automatic acquisition breaker thermal image, and graphical analysis is carried out to heat picture draw judged result, realize the real time on-line monitoring to isolating switch, judging the state of isolating switch without the need to manually reading picture again, decreasing a large amount of human resources.By compensating critical area the extraction of breaker thermal image critical area, the characteristic matrix that feature calculation obtains described isolating switch is carried out to the critical area of the described breaker thermal image after compensation, the characteristic matrix of described isolating switch is contrasted with the characteristic matrix of the characteristic matrix in knowledge base and described isolating switch history respectively, obtain the first comparing result data and the second comparing result data, described first comparing result data and described second comparing result data are weighted read group total, obtain calculation result data, according to described calculation result data, judge the state of described isolating switch.By the impact of environment on heat picture effectively can be eliminated on the compensation of critical area, obtain heat picture more accurately, again feature extraction is carried out to the heat picture after compensation, obtain characteristic matrix more accurately, according to characteristic matrix, draw judged result more accurately through contrast and judgement, on-line monitoring reliability can be improved, thus improve the reliability of electric system.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the circuit breaker online monitoring method of an embodiment;
Fig. 2 is the schematic diagram of the isolating switch on-line monitoring system of an embodiment;
Fig. 3 is absolute value subordinate function;
Fig. 4 is rate of change subordinate function;
Fig. 5 is fault rate subordinate function.
Embodiment
Refer to Fig. 1, a kind of circuit breaker online monitoring method of embodiment is provided, comprises the steps:
S100: gather breaker thermal image.
Thermal imaging system is installed on-board the circuit breaker, adopts thermal imaging system to gather breaker thermal image, and the temperature of energy Real-time Collection isolating switch obtains temperature data.By the picture of thermal imaging system by shot object, damage can not be caused to monitored isolating switch.After gathering breaker thermal image, after also needing that image digitazation process is carried out to breaker thermal image, carried out gray processing process.Choose m*n sampled point according to the size of image to sample to image, image can adopt the matrix representation of m*n size.
S200: according to the positional information of breaker thermal image and predetermined critical area, extracts non-critical areas and critical area.
Because the position of the phase of same model isolating switch is determined, and the critical area of the every phase of isolating switch is determined, namely the position of critical area on breaker thermal image array is determined, thus, according to the positional information of predetermined critical area, from breaker thermal image divisible go out critical area and non-critical areas.In the present embodiment, the critical area of isolating switch comprises the first leading-out terminal region, the second leading-out terminal region and voltage contact area, above-mentioned three critical areas are vulnerable to the impact of connecting and disconnecting of the circuit electricity, and the duty of isolating switch can be affected, by the heat picture analysis to above-mentioned three critical areas, the duty of isolating switch effectively can be judged.
S300: the critical area of breaker thermal image is compensated.
Because isolating switch can be subject to the impact of environment, when carrying out heat picture and collecting breaker thermal image, heat picture is the image being subject to environmental interference, thus need to compensate breaker thermal image, to eliminate the interference that the factor such as ambient temperature, ambient light produces image, obtain breaker thermal image more accurately.
S400: the characteristic matrix that feature calculation obtains isolating switch is carried out to the critical area of the breaker thermal image after compensation.
Respectively feature calculation is carried out to above-mentioned three critical areas, obtains characteristic matrix, for follow-up contrast judges to provide foundation.
S500: contrasted by the characteristic matrix in the characteristic matrix of isolating switch and knowledge base, obtains the first comparing result data; The characteristic matrix of isolating switch and the history feature data matrix of isolating switch are analyzed, obtain the second comparing result data.
The characteristic matrix of the characteristic matrix during knowledge base comprises and other isolating switchs of isolating switch same model.The characteristic matrix that knowledge base comprises extracts when normally working the isolating switch of same model to obtain.The characteristic matrix that the characteristic matrix of isolating switch history calculates before being the isolating switch of monitoring at present.The mode of contrast has multiple, and such as, calculated difference rate of change etc. after asking difference or asking difference, difference can reflect fault, and rate of change can reflect whether become worse possibility.The the first comparing result data obtained and the second comparing result data.To the first comparing result data and the second comparing result data analysis, such as, for the first comparing result data, calculate the normal degree parameter of instruction normal degree, then corresponding confidence level is multiplied by according to concrete isolating switch, obtain analysis result, the contacting of the upper leading-out terminal that analysis result comprises every phase and lower wire end, the contact point heat condition of heat condition, contact, connection state, insulation course breakage.Wherein normal degree is according to calculating, and confidence level is determined according to the test of concrete isolating switch.
S700: the first comparing result data and the second comparing result data are weighted read group total, obtain calculation result data.
Because comparing result may occur contingency, two kinds of comparing result weighted sums are calculated, to reduce the contingency of contrast, improve the accuracy of comparing result.
S800: according to calculation result data, judges the state of isolating switch.
According to calculation result data, judge whether isolating switch breaks down, when judging to break down, showing judged result by display, facilitating staff to check, simultaneously to Surveillance center's transmission judged result information, if break down, carry out fault handling.When insulation course leaks electricity serious or contact burning, send warning, require that staff processes in time, generate heat abnormal when contact and when temporarily can normally work, remind staff to change contact, when loop generates heat severely subnormal, emergency opening.
Above-mentioned circuit breaker online monitoring method, by automatic acquisition breaker thermal image, and graphical analysis is carried out to heat picture draw judged result, realize the real time on-line monitoring to isolating switch, carrying out judging the state of isolating switch without the need to manually reading picture again, decreasing a large amount of human resources.The impact of environment on heat picture effectively can be eliminated by the compensation of the critical area on isolating switch, obtain heat picture more accurately, again feature extraction is carried out to the heat picture after compensation, obtain characteristic matrix more accurately, according to characteristic matrix, draw judged result more accurately through contrast and judgement, on-line monitoring reliability can be improved, thus improve the reliability of electric system.
Wherein in an embodiment, breaker thermal image comprises every phase heat picture of isolating switch; The critical area of breaker thermal image comprises each critical area of every phase heat picture of isolating switch.
In the present embodiment, isolating switch is three-phase breaker, and three-phase is respectively A phase, B phase and C phase.Thermal imaging system goes up installation mutually the every of isolating switch, and for obtaining every phase heat picture of isolating switch, obtain three-phase heat picture, the equal usable image matrix representation of every phase heat picture, is respectively K
a, K
b, K
c, K
arepresent the image array of A phase heat picture, K
brepresent the image array of B phase heat picture, K
crepresent the image array of C phase heat picture.Breaker thermal image comprises every phase heat picture of isolating switch, the critical area of breaker thermal image comprises each critical area of every phase heat picture of isolating switch, namely in the A phase of isolating switch, B phase and C phase, is extracted the first leading-out terminal region, the second leading-out terminal region and voltage contact area respectively.Each heat picture can adopt following expression to represent:
Wherein, wherein K
nrepresent image array, can be replaced K
a, K
b, K
c, function f (m, n) representative is at specific (m, n) gray-scale value, such as, above-mentioned f (1,1) gray-scale value that image is put in (1,1) is represented, f (1,2) gray-scale value that image is put in (1,2) is represented, f (1, n) represent image (1, gray-scale value n) put, f (m, 1) gray-scale value put in (m, 1) is represented.Respectively to K
a, K
b, K
csplit, obtain critical area and the non-critical areas of every phase heat picture.The critical area of the every phase of isolating switch is the first leading-out terminal region, the second leading-out terminal region and voltage contact area.Like this, isolating switch is every all can obtain three critical area images mutually, obtains 9 region heat pictures, is respectively K
a1, K
a2, K
a3, K
b1, K
b2, K
b3, K
c1, K
c2and K
c3, K
a1, K
a2, K
a3represent the first leading-out terminal area image matrix of A phase, the second leading-out terminal area image matrix and voltage contact area image array respectively, K
b1, K
b2, K
b3represent the first leading-out terminal area image matrix of B phase, the second leading-out terminal area image matrix and voltage contact area image array respectively, K
c1, K
c2, K
c3represent the first leading-out terminal area image matrix of C phase, the second leading-out terminal area image matrix and voltage contact area image array respectively.K
ncan be replaced K
a1, K
a2, K
a3, K
b1, K
b2, K
b3, K
c1, K
c2and K
c3.
First leading-out terminal region of every phase heat picture, the second leading-out terminal region and voltage contact area are compensated, to eliminate the interference of the every phase of isolating switch.Respectively feature calculation is carried out to the first leading-out terminal region of the every phase after compensating, the second leading-out terminal region and voltage contact area, obtains the characteristic matrix of critical area.
Wherein in an embodiment, above-mentioned circuit breaker online monitoring method also comprises:
The compensatory zone of every phase heat picture is chosen from the non-critical areas of every phase heat picture of isolating switch;
Heat picture collection is carried out to the reference zone beyond every phase heat picture of isolating switch, obtains reference zone heat picture.
The step that the critical area of breaker thermal image compensates is comprised:
According to reference zone heat picture, first time compensation is carried out to each critical area of every phase heat picture of isolating switch;
The compensatory zone corresponding according to every phase heat picture, carries out second time to each critical area of every phase heat picture of the isolating switch after first time compensates and compensates.
A compensatory zone is chosen to the non-critical areas of every phase heat picture, is respectively K
a4, K
b4and K
c4, K
a4, K
b4and K
c4represent the compensatory zone image array of A phase, the compensatory zone image array of B phase and the compensatory zone image array of C phase respectively.Reference zone beyond every phase heat picture of isolating switch there are also installed thermal imaging system, for carrying out heat picture collection to the reference zone beyond every phase heat picture of isolating switch, obtains reference zone heat picture.Reference zone heat picture image array K
drepresent, like this, obtain the image array of 13 area images together with above-mentioned 9 area images.Above-mentioned K
ncan be replaced K
a4, K
b4, K
c4and K
d.
First time compensation is carried out according to each critical area of reference zone heat picture to every phase heat picture, to eliminate the interference of external environment to A phase, B phase and C phase, such as, eliminate the interference to A phase, B phase and C phase such as temperature Change, sunlight irradiation, veiling glare, reference zone is same with the environment facies residing for isolating switch A phase, B phase and C phase, and certain region on the isolating switch do not affected by connecting and disconnecting of the circuit, as isolating switch frame.Carrying out the method that first time compensates has multiple, in this specific embodiment, carries out first time compensation formula as follows to each critical area of every phase heat picture:
K
A1'＝a(K
A1-Avg(K
A1)*Ones(m,n))+b(K
A1-Avg(K
D)*Ones(m,n))。
Wherein, K
a1' represent the first leading-out terminal region first time of A phase heat picture compensate after image array.A and b is adjustment factor, a and b's and be 1, Avg (K
a1) be the first leading-out terminal area image Matrix Calculating mean value to A phase heat picture, Ones (m, n) is the m*n matrix of 1.Wherein, K
a1available K
a2, K
a3, K
b1, K
b2, K
b3, K
c1, K
c2and K
c3substitute, work as K
a1after replaced, corresponding critical area image array is averaged, accordingly, K
a1' available K
a2', K
a3', K
b1', K
b2', K
b3', K
c1', K
c2' and K
c3' substitute.K
a2' and K
a3' represent respectively the second leading-out terminal region first time of A phase heat picture compensate after image array and voltage contact area first time compensate after image array.K
b1', K
b2' and K
b3' represent respectively the first leading-out terminal region first time of B phase heat picture compensate after image array, the second leading-out terminal region first time compensate after image array and voltage contact area first time compensate after image array.K
c1', K
c2' and K
c3' represent respectively the first leading-out terminal region first time of C phase heat picture compensate after image array, the second leading-out terminal region first time compensate after image array and voltage contact area first time compensate after image array.
Every position residing mutually of isolating switch is different, thus residing environment there are differences, in order to eliminate this difference, choosing one in the non-critical areas often gone up mutually affects less region as compensatory zone by circuit power on/off, as certain region between the first leading-out terminal region and voltage contact area.According to compensatory zone, second time is carried out to each critical area of every phase heat picture of the isolating switch after first time compensates and compensates.Carrying out the method that second time compensates has multiple, in this specific embodiment, carries out second time compensation formula as follows to each critical area of every phase heat picture after first time compensates:
K
A1”＝a(K
A1'-Avg(K
A1')*Ones(m,n))+b(K
A1'-Avg(K
A4)*Ones(m,n))。
Wherein, K
a1" for carrying out the image array after second time compensation again in the first leading-out terminal region of A phase heat picture after first time compensates.Avg (K
a1') for averaging to the image array of the first leading-out terminal region after first time compensates of A phase heat picture.Wherein, K
a1" available K
a2", K
a3", K
b1", K
b2", K
b3", K
c1", K
c2" and K
c3" substitute, accordingly, K
a1' available K
a2', K
a3', K
b1', K
b2', K
b3', K
c1', K
c2' and K
c3' substitute, K
a4available K
b4, K
c4substitute.K
a2" and K
a3" represent respectively the second leading-out terminal region first time of A phase heat picture compensate after carry out again second time compensate after image array and voltage contact area first time compensate after carry out again second time compensate after image array.K
b1", K
b2" and K
b3" represent that the image array after carrying out second time compensation again after carrying out the image array after compensating for the second time, the second leading-out terminal region first time compensation again after the first leading-out terminal region of B phase heat picture compensates for the first time and voltage contact area first time carry out the image array after compensating for the second time after compensating again respectively.K
c1", K
c2" and K
c3" represent that the image array after carrying out second time compensation again after carrying out the image array after compensating for the second time, the second leading-out terminal region first time compensation again after the first leading-out terminal region of C phase heat picture compensates for the first time and voltage contact area first time carry out the image array after compensating for the second time after compensating again respectively.
Compensated by first time and second time compensation, not only eliminate the impact of overall situation on isolating switch, and eliminate the impact of regional environment deviation, obtain critical area more accurately, improve monitoring accuracy.Be appreciated that the order interchangeable that the first compensation and second time compensate.
Wherein in an embodiment, the step that feature calculation obtains the characteristic matrix of isolating switch is carried out to the critical area of breaker thermal image after compensating and comprises:
Feature extraction is carried out respectively to each critical area of every phase heat picture of the isolating switch after compensation and obtains eigenwert;
Each eigenwert is taken absolute value, forms absolute value vector;
Ask the rate of change of each absolute value, formation and modification rate vector.
Absolute value vector combines with rate of change vector the characteristic matrix forming isolating switch.
In the present embodiment, three-phase heat picture, corresponding three critical areas of every phase heat picture, thus need to carry out feature calculation respectively to 9 critical areas, obtain 9 eigenwerts, 9 eigenwerts are taken absolute value, and 9 absolute value composition arrays are formed absolute value vector.Ask the rate of change of each absolute value in absolute value vector, obtain 9 rate of change, and by 9 rate of change composition array formation and modification rate vectors.The combination of absolute value vector sum rate of change vector forms the characteristic matrix of isolating switch.The connection of absolute value reflection critical area, contact situation, the heat condition of the rate of change reflection critical area of absolute value, the characteristic matrix that absolute value and rate of change form isolating switch can reflect the working condition of the critical area of isolating switch.
Refer to Fig. 3, Fig. 4 and Fig. 5, wherein in an embodiment, above-mentioned circuit breaker online monitoring method also comprises step:
According to the fuzzy set of characteristic element in fuzzy membership function and characteristic matrix, obtain the trend result that characteristic element in characteristic matrix is under the jurisdiction of corresponding fuzzy set;
According to trend result, fuzzy rule and fuzzy membership function, obtain fault rate;
According to fault rate, judge the state of isolating switch.
The input value of Fuzzy Calculation is characteristic matrix, and the characteristic element in characteristic matrix comprises absolute value and rate of change, and output valve is fault rate, and the fuzzy set of absolute value is: little, less than normal, normal, bigger than normal, large; The fuzzy set of rate of change is: negative large, negative little, zero, just little, honest; The fuzzy set of output valve is: without, little, in, large, corresponding fuzzy rule is as shown in table 1.According to the absolute value subordinate function in characteristic matrix and rate of change subordinate function, obtain the trend result that absolute value and rate of change are under the jurisdiction of corresponding fuzzy set respectively.At the fuzzy rule of basis as table 1, obtain the trend result of fault rate, such as, when absolute value, to be subordinate in mould corresponding fuzzy set little, it is negative large that rate of change is under the jurisdiction of in corresponding fuzzy set, what then probability of malfunction was subordinate in corresponding fuzzy set is large, namely obtains fault rate again by fault rate subordinate function as shown in Figure 5, calculates the trend result of fault rate.Because the characteristic element in characteristic matrix comprises absolute value and the rate of change of the eigenwert of each critical area of every phase heat picture, thus the probability that each critical area fault that the fault rate obtained comprises every phase heat picture occurs.
Table 1
Fig. 3 represents absolute value subordinate function, and horizontal ordinate represents normalized absolute value, and ordinate represents normalized fuzzy membership.Such as, when absolute value is 0.2, it belongs to little degree of membership and is less than and belongs to degree of membership less than normal, and 0.2 belongs to possibility less than normal is greater than and belongs to little possibility, then think that absolute value belongs to less than normal when being 0.2.Fig. 4 represents rate of change subordinate function, and horizontal ordinate represents normalized rate of change, and ordinate represents normalized fuzzy membership.Such as, when rate of change is 0.2, it belongs to negative large degree of membership and is less than and belongs to negative little degree of membership, and 0.2 belongs to negative little possibility is greater than and belongs to negative large possibility, then think that rate of change belongs to negative little when being 0.2.
Wherein in an embodiment, according to fault rate, judge that the step of the state of isolating switch comprises step:
Whether failure judgement probability of happening exceeds preset failure probability;
If so, judge that the state of isolating switch is as fault;
If not, judge that the state of isolating switch is as non-fault.
Fault is considered as, for the treatment of incipient fault when the fault rate in certain region exceedes preset failure probability.
Wherein in an embodiment, according to calculation result data, judge that the step of the state of isolating switch comprises step:
Judge in calculation result data, whether single result data exceeds preset security value;
If so, judge that the state of isolating switch is as fault;
If not, judge that the state of isolating switch is as non-fault.
Result after each critical area including every phase heat picture in result of calculation contrasts, single result refers to the comparing result of each critical area of the single-phase heat picture in wherein breaker thermal image.Single result is to having the contacting of the first leading-out terminal of every phase and the second leading-out terminal, heat condition, the contact point heat condition of contact, when the value of single result data is beyond preset security value, think the contacting of the first leading-out terminal of every phase and the second leading-out terminal, heat condition, the contact point heat condition of contact exceeds security situation.
Wherein in an embodiment, according to result of calculation, judge that the step of the state of isolating switch comprises step:
Single result data in calculation result data is weighted read group total, obtains synthesis result data;
Judge whether synthesis result data exceed default ratings;
If so, the state of isolating switch is fault;
If not, the state of isolating switch is non-fault.
Synthesis result data are weighted summation to above-mentioned single-phase result data and obtain, and the situation of every phase heat picture comprehensively being obtained, carry out breakdown judge according to synthesis result data, is judge isolating switch overall work situation.
Refer to Fig. 2, a kind of isolating switch on-line monitoring system of embodiment be provided, comprise:
Acquisition module 100, for gathering breaker thermal image.
Thermal imaging system is installed on-board the circuit breaker, adopts thermal imaging system to gather breaker thermal image, and the temperature of energy Real-time Collection isolating switch obtains temperature data.After gathering breaker thermal image, also need to adopt pretreatment module to carry out image digitazation process to breaker thermal image, carried out gray processing process.Choose m*n sampled point according to the size of image to sample to image, image can adopt the matrix representation of m*n size.
Extraction module 200, for the positional information according to breaker thermal image and predetermined critical area, extracts non-critical areas and critical area.
Because the position of the phase of same model isolating switch is determined, and the critical area of the every phase of isolating switch is determined, namely the position of critical area on breaker thermal image array is determined, thus, extraction module 200 according to the positional information of predetermined critical area, from breaker thermal image divisible go out critical area and non-critical areas.In the present embodiment, the critical area of isolating switch comprises the first leading-out terminal region, the second leading-out terminal region and voltage contact area, above-mentioned three critical areas are vulnerable to the impact of connecting and disconnecting of the circuit electricity, and the duty of isolating switch can be affected, by the heat picture analysis to above-mentioned three critical areas, the duty of isolating switch effectively can be judged.
Compensating module 300, for compensating the critical area of breaker thermal image.
Because isolating switch can be subject to the impact of environment, when carrying out heat picture and collecting breaker thermal image, heat picture is the image being subject to environmental interference, thus need to utilize compensating module 300 pairs of breaker thermal images to compensate, to eliminate the interference that the factor such as ambient temperature, ambient light produces image, obtain breaker thermal image more accurately.
First computing module 400, for carrying out to the critical area of the breaker thermal image after compensation the characteristic matrix that feature calculation obtains isolating switch.
Contrast module 500, for being contrasted by the characteristic matrix in the characteristic matrix of isolating switch and knowledge base, obtains the first comparing result data; Also for the characteristic matrix of isolating switch and the history feature data matrix of isolating switch being analyzed, obtain the second comparing result data; Characteristic matrix in knowledge base comprises the characteristic matrix with other isolating switchs of isolating switch same model.
Second computing module 600, for the first comparing result data and the second comparing result data are weighted read group total, obtains calculation result data.
Because comparing result may occur contingency, two kinds of comparing result weighted sums are calculated, to reduce the contingency of contrast, improve the accuracy of comparing result.
Processing module 700, for according to calculation result data, judges the state of isolating switch.
According to calculation result data, judge whether isolating switch breaks down, when judging to break down, showing judged result by display, facilitating staff to check, simultaneously to Surveillance center's transmission judged result information, if break down, carry out fault handling.When insulation course leaks electricity serious or contact burning, send warning, require that staff processes in time, generate heat abnormal when contact and when temporarily can normally work, remind staff to change contact, when loop generates heat severely subnormal, emergency opening.
Above-mentioned isolating switch on-line monitoring system, by acquisition module 100 automatic acquisition breaker thermal image, and graphical analysis is carried out to heat picture draw judged result, realize the real time on-line monitoring to isolating switch, carrying out judging the state of isolating switch without the need to manually reading picture again, decreasing a large amount of human resources.The critical area of compensating module 300 pairs of isolating switchs is utilized to compensate, effectively can eliminate the impact of environment on heat picture, obtain heat picture more accurately, by the first computing module 400, feature extraction is carried out to the heat picture after compensation again, obtain characteristic matrix more accurately, according to characteristic matrix, the first comparing result data and the second result data is obtained by contrast module 500, second computing module 600 is weighted summation to the first comparing result data and the second result data and obtains calculation result data accurately, processing module 700 draws judged result more accurately according to calculation result data, on-line monitoring reliability can be improved, thus improve the reliability of electric system.
Wherein in an embodiment, the critical area of breaker thermal image comprises the first leading-out terminal region, the second leading-out terminal region and voltage contact area.Breaker thermal image comprises every phase heat picture of isolating switch, and the critical area of breaker thermal image comprises each critical area of every phase heat picture of isolating switch.
In the present embodiment, isolating switch is three-phase breaker, and three-phase is respectively A phase, B phase and C phase.Thermal imaging system goes up installation mutually the every of isolating switch, and for obtaining every phase heat picture of isolating switch, obtain three-phase heat picture, the equal usable image matrix representation of every phase heat picture, is respectively K
a, K
b, K
c, K
arepresent the image array of A phase heat picture, K
brepresent the image array of B phase heat picture, K
crepresent C phase heat picture image array.Breaker thermal image comprises every phase heat picture of isolating switch, the critical area of breaker thermal image comprises each critical area of every phase heat picture of isolating switch, namely in the A phase of isolating switch, B phase and C phase, is extracted the first leading-out terminal region, the second leading-out terminal region and voltage contact area respectively.Each heat picture can adopt following expression to represent:
Wherein, wherein K
nrepresent image array, can be replaced K
a, K
b, K
c, function f (m, n) representative is at specific (m, n) gray-scale value, such as, above-mentioned f (1,1) gray-scale value that image is put in (1,1) is represented, f (1,2) gray-scale value that image is put in (1,2) is represented, f (1, n) represent image (1, gray-scale value n) put, f (m, 1) gray-scale value put in (m, 1) is represented.Respectively to K
a, K
b, K
csplit, obtain critical area and the non-critical areas of every phase heat picture.The critical area of the every phase of isolating switch is the first leading-out terminal region, the second leading-out terminal region and voltage contact area.Like this, isolating switch is every all can obtain three critical area images mutually, obtains 9 region heat pictures, is respectively K
a1, K
a2, K
a3, K
b1, K
b2, K
b3, K
c1, K
c2and K
c3, K
a1, K
a2, K
a3represent the first leading-out terminal area image matrix of A phase, the second leading-out terminal area image matrix and voltage contact area image array respectively, K
b1, K
b2, K
b3represent the first leading-out terminal area image matrix of B phase, the second leading-out terminal area image matrix and voltage contact area image array respectively, K
c1, K
c2, K
c3represent the first leading-out terminal area image matrix of C phase, the second leading-out terminal area image matrix and voltage contact area image array respectively.K
ncan be replaced K
a1, K
a2, K
a3, K
b1, K
b2, K
b3, K
c1, K
c2and K
c3.
First leading-out terminal region of every phase heat picture, the second leading-out terminal region and voltage contact area are compensated, to eliminate the interference of the every phase of isolating switch.Respectively feature calculation is carried out to the first leading-out terminal region of the every phase after compensating, the second leading-out terminal region and voltage contact area, obtains the characteristic matrix of critical area.
Wherein in an embodiment, compensating module 300 comprises the first compensating module and the second compensating module;
Extraction module 200, chooses the compensatory zone of every phase heat picture in the non-critical areas also for the every phase heat picture from isolating switch.
Acquisition module 100, also for carrying out heat picture collection to the reference zone beyond every phase heat picture of isolating switch, obtains reference zone heat picture.
First compensating module, for according to reference zone heat picture, carries out first time compensation to each critical area of every phase heat picture of isolating switch.
Second compensating module, for the compensatory zone corresponding according to every phase heat picture, carries out second time to each critical area of every phase heat picture of the isolating switch after first time compensates and compensates.
A compensatory zone is chosen to the non-critical areas of every phase heat picture, is respectively K
a4, K
b4and K
c4, K
a4, K
b4and K
c4represent the compensatory zone image array of A phase, the compensatory zone image array of B phase and the compensatory zone image array of C phase respectively.Reference zone beyond every phase heat picture of isolating switch there are also installed thermal imaging system, for carrying out heat picture collection to the reference zone beyond every phase heat picture of isolating switch, obtains reference zone heat picture.Reference zone heat picture image array K
drepresent, like this, obtain the image array of 13 area images together with above-mentioned 9 area images.Above-mentioned K
ncan be replaced K
a4, K
b4, K
c4and K
d.
First time compensation is carried out according to each critical area of reference zone heat picture to every phase heat picture, to eliminate the interference of external environment to A phase, B phase and C phase, such as, eliminate the interference to A phase, B phase and C phase such as temperature Change, sunlight irradiation, veiling glare, reference zone is same with the environment facies residing for isolating switch A phase, B phase and C phase, and certain region on the isolating switch do not affected by connecting and disconnecting of the circuit, as isolating switch frame.Carrying out the method that first time compensates has multiple, in this specific embodiment, carries out first time compensation formula as follows to each critical area of every phase heat picture:
K
A1'＝a(K
A1-Avg(K
A1)*Ones(m,n))+b(K
A1-Avg(K
D)*Ones(m,n))。
Wherein, K
a1' represent the first leading-out terminal region first time of A phase heat picture compensate after image array.A and b is adjustment factor, a and b's and be 1, Avg (K
a1) be the first leading-out terminal area image Matrix Calculating mean value to A phase heat picture, Ones (m, n) is the m*n matrix of 1.Wherein, K
a1available K
a2, K
a3, K
b1, K
b2, K
b3, K
c1, K
c2and K
c3substitute, work as K
a1after replaced, corresponding critical area image array is averaged, accordingly, K
a1' available K
a2', K
a3', K
b1', K
b2', K
b3', K
c1', K
c2' and K
c3' substitute.K
a2' and K
a3' represent respectively the second leading-out terminal region first time of A phase heat picture compensate after image array and voltage contact area first time compensate after image array.K
b1', K
b2' and K
b3' represent respectively the first leading-out terminal region first time of B phase heat picture compensate after image array, the second leading-out terminal region first time compensate after image array and voltage contact area first time compensate after image array.K
c1', K
c2' and K
c3' represent respectively the first leading-out terminal region first time of C phase heat picture compensate after image array, the second leading-out terminal region first time compensate after image array and voltage contact area first time compensate after image array.
Every position residing mutually of isolating switch is different, thus residing environment there are differences, in order to eliminate this difference, choosing one in the non-critical areas often gone up mutually affects less region as compensatory zone by circuit power on/off, as certain region between the first leading-out terminal region and voltage contact area.According to compensatory zone, second time is carried out to each critical area of every phase heat picture of the isolating switch after first time compensates and compensates.Carrying out the method that second time compensates has multiple, in this specific embodiment, carries out second time compensation formula as follows to each critical area of every phase heat picture after first time compensates:
K
A1”＝a(K
A1'-Avg(K
A1')*Ones(m,n))+b(K
A1'-Avg(K
A4)*Ones(m,n))。
Wherein, K
a1" for carrying out the image array after second time compensation again in the first leading-out terminal region of A phase heat picture after first time compensates.Avg (K
a1') for averaging to the image array of the first leading-out terminal region after first time compensates of A phase heat picture.Wherein, K
a1" available K
a2", K
a3", K
b1", K
b2", K
b3", K
c1", K
c2" and K
c3" substitute, accordingly, K
a1' available K
a2', K
a3', K
b1', K
b2', K
b3', K
c1', K
c2' and K
c3' substitute, K
a4available K
b4, K
c4substitute.K
a2" and K
a3" represent respectively the second leading-out terminal region first time of A phase heat picture compensate after carry out again second time compensate after image array and voltage contact area first time compensate after carry out again second time compensate after image array.K
b1", K
b2" and K
b3" represent that the image array after carrying out second time compensation again after carrying out the image array after compensating for the second time, the second leading-out terminal region first time compensation again after the first leading-out terminal region of B phase heat picture compensates for the first time and voltage contact area first time carry out the image array after compensating for the second time after compensating again respectively.K
c1", K
c2" and K
c3" represent that the image array after carrying out second time compensation again after carrying out the image array after compensating for the second time, the second leading-out terminal region first time compensation again after the first leading-out terminal region of C phase heat picture compensates for the first time and voltage contact area first time carry out the image array after compensating for the second time after compensating again respectively.
Compensated by first time and second time compensation, not only eliminate the impact of overall situation on isolating switch, and eliminate the impact of regional environment deviation, obtain critical area more accurately, improve monitoring accuracy.Be appreciated that the order interchangeable that the first compensation and second time compensate.
Wherein in an embodiment, the first computing module 400 comprises:
First computing unit, each critical area for the every phase heat picture to the isolating switch after compensation carries out feature extraction respectively and obtains eigenwert;
Second computing unit, for taking absolute value to each eigenwert, forms absolute value vector;
3rd computing unit, for asking the rate of change of each absolute value, formation and modification rate vector;
Assembled unit, for combining absolute value vector and rate of change vector the characteristic matrix forming isolating switch.
In the present embodiment, three-phase heat picture, corresponding three critical areas of every phase heat picture, thus need to carry out feature calculation respectively to 9 critical areas, obtain 9 eigenwerts, 9 eigenwerts are taken absolute value, and 9 absolute value composition arrays are formed absolute value vector.Ask the rate of change of each absolute value in absolute value vector, obtain 9 rate of change, and by 9 rate of change composition array formation and modification rate vectors.The combination of absolute value vector sum rate of change vector forms the characteristic matrix of isolating switch.The connection of absolute value reflection critical area, contact situation, the heat condition of the rate of change reflection critical area of absolute value, the characteristic matrix that absolute value and rate of change form isolating switch can reflect the working condition of the critical area of isolating switch.
Wherein in an embodiment, above-mentioned isolating switch on-line monitoring system also comprises the 3rd computing module and the 4th computing module.
3rd computing module, for the fuzzy set according to characteristic element in fuzzy membership function and characteristic matrix, obtains the trend result that characteristic element in characteristic matrix is under the jurisdiction of fuzzy set.
4th computing module, for according to trend result, fuzzy rule and fuzzy membership function, obtains fault rate.
Processing module 700, also for according to fault rate, judges the state of isolating switch.
Wherein in an embodiment, processing module 700 comprises:
Whether the first judge module, exceed preset failure probability of occurrence for failure judgement probability of happening, if be judged to be is, the first judge module is also for judging that the state of isolating switch is as fault; If be judged to be no, the first judge module is also for judging that the state of isolating switch is as non-fault.
Wherein in an embodiment, processing module 700 also comprises:
Second judge module, for judging that in calculation result data, whether single result data exceeds preset security value, if be judged to be is, the second judge module is also for judging that the state of isolating switch is as fault; If be judged to be no, the second judge module is also for judging that the state of isolating switch is as non-fault.
Wherein in an embodiment, above-mentioned isolating switch on-line monitoring system also comprises:
5th computing module, for the single result data in calculation result data is weighted read group total, obtains synthesis result data.
Processing module 700 also comprises:
3rd judge module, for judging whether synthesis result data exceed default ratings, if be judged to be is, the 3rd judge module is also for judging that the state of isolating switch is as fault; If be judged to be no, the 3rd judge module is also for judging that the state of isolating switch is as non-fault.
Each technical characteristic of above embodiment can combine arbitrarily, for making description succinct, all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
Above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a circuit breaker online monitoring method, is characterized in that, comprises the steps:
Gather breaker thermal image;
According to the positional information of described breaker thermal image and predetermined critical area, extract non-critical areas and critical area;
The critical area of described breaker thermal image is compensated;
The characteristic matrix that feature calculation obtains described isolating switch is carried out to the critical area of the described breaker thermal image after compensation;
Characteristic matrix in the characteristic matrix of described isolating switch and knowledge base is contrasted, obtains the first comparing result data; The characteristic matrix of described isolating switch and the history feature data matrix of described isolating switch are analyzed, obtain the second comparing result data; Characteristic matrix in described knowledge base comprises the characteristic matrix with other isolating switchs of described isolating switch same model;
Described first comparing result data and described second comparing result data are weighted read group total, obtain calculation result data;
According to described calculation result data, judge the state of described isolating switch.
2. circuit breaker online monitoring method according to claim 1, is characterized in that, the critical area of described breaker thermal image comprises the first leading-out terminal region, the second leading-out terminal region and voltage contact area;
Described breaker thermal image comprises every phase heat picture of described isolating switch;
The critical area of described breaker thermal image comprises each critical area of every phase heat picture of described isolating switch.
3. circuit breaker online monitoring method according to claim 2, is characterized in that, also comprises step:
The compensatory zone of every phase heat picture is chosen from the non-critical areas of every phase heat picture of described isolating switch;
Heat picture collection is carried out to the reference zone beyond every phase heat picture of described isolating switch, obtains reference zone heat picture;
Described the step that the critical area of described breaker thermal image compensates to be comprised:
According to described reference zone heat picture, first time compensation is carried out to each critical area of every phase heat picture of described isolating switch;
The described compensatory zone corresponding according to described every phase heat picture, carries out second time to each critical area of every phase heat picture of the described isolating switch after described first time compensates and compensates.
4. circuit breaker online monitoring method according to claim 2, is characterized in that, describedly carries out to the critical area of described breaker thermal image after compensating the step that feature calculation obtains the characteristic matrix of described isolating switch and comprises:
Feature extraction is carried out respectively to each critical area of every phase heat picture of the described isolating switch after compensation and obtains eigenwert;
Each described eigenwert is taken absolute value, forms absolute value vector;
Ask the rate of change of each described absolute value, formation and modification rate vector;
Described absolute value vector combines with described rate of change vector the characteristic matrix forming described isolating switch.
5. circuit breaker online monitoring method according to claim 4, is characterized in that, also comprises step:
According to the fuzzy set of characteristic element in fuzzy membership function and described characteristic matrix, obtain characteristic element in described characteristic matrix and be under the jurisdiction of the trend result of described fuzzy set;
According to described trend result, fuzzy rule and described fuzzy membership function, obtain fault rate;
According to described fault rate, judge the state of described isolating switch.
6. circuit breaker online monitoring method according to claim 2, is characterized in that, described according to described calculation result data, judges that the step of the state of described isolating switch comprises step:
Judge in described calculation result data, whether single result data exceeds preset security value;
If so, judge that the state of described isolating switch is as fault;
If not, judge that the state of described isolating switch is as non-fault;
Or,
Single result in described result of calculation is weighted read group total, obtains synthesis result data;
Judge whether described synthesis result data exceed default ratings;
If so, judge that the state of described isolating switch is as fault;
If not, judge that the state of described isolating switch is as non-fault.
7. an isolating switch on-line monitoring system, is characterized in that, comprising:
Acquisition module, for gathering breaker thermal image;
Extraction module, for the positional information according to described breaker thermal image and predetermined critical area, extracts non-critical areas and critical area;
Compensating module, for compensating the critical area of described breaker thermal image;
First computing module, for carrying out to the critical area of the described breaker thermal image after compensation the characteristic matrix that feature calculation obtains described isolating switch;
Contrast module, for being contrasted by the characteristic matrix in the characteristic matrix of described isolating switch and knowledge base, obtains the first comparing result data; Also for the characteristic matrix of described isolating switch and the history feature data matrix of described isolating switch being analyzed, obtain the second comparing result data; Characteristic matrix in described knowledge base comprises the characteristic matrix with other isolating switchs of described isolating switch same model;
Second computing module, for described first comparing result data and described second comparing result data are weighted read group total, obtains calculation result data;
Processing module, for according to described calculation result data, judges the state of described isolating switch.
8. isolating switch on-line monitoring system according to claim 7, is characterized in that, the critical area of described breaker thermal image comprises the first leading-out terminal region, the second leading-out terminal region and voltage contact area;
Described breaker thermal image comprises every phase heat picture of described isolating switch;
The critical area of described breaker thermal image comprises each critical area of every phase heat picture of described isolating switch.
9. isolating switch on-line monitoring system according to claim 8, is characterized in that, described compensating module comprises the first compensating module and the second compensating module;
Described extraction module, chooses the compensatory zone of every phase heat picture in the non-critical areas also for the every phase heat picture from described isolating switch;
Described acquisition module, also for carrying out heat picture collection to the reference zone beyond every phase heat picture of described isolating switch, obtains reference zone heat picture;
Described first compensating module, for according to described reference zone heat picture, carries out first time compensation to each critical area of every phase heat picture of described isolating switch;
Described second compensating module, for the described compensatory zone corresponding according to described every phase heat picture, carries out second time to each critical area of every phase heat picture of the described isolating switch after described first time compensates and compensates.
10. isolating switch on-line monitoring system according to claim 8, is characterized in that, described first computing module comprises:
First computing unit, each critical area for the every phase heat picture to the described isolating switch after compensation carries out feature extraction respectively and obtains eigenwert;
Second computing unit, for taking absolute value to each described eigenwert, forms absolute value vector;
3rd computing unit, for asking the rate of change of each described absolute value, formation and modification rate vector;
Assembled unit, for combining described absolute value vector and described rate of change vector the characteristic matrix forming described isolating switch.
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Effective date of registration: 20200916 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |