CN103576050B - A kind of running status appraisal procedure of capacitance type potential transformer - Google Patents

A kind of running status appraisal procedure of capacitance type potential transformer Download PDF

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CN103576050B
CN103576050B CN201310594159.6A CN201310594159A CN103576050B CN 103576050 B CN103576050 B CN 103576050B CN 201310594159 A CN201310594159 A CN 201310594159A CN 103576050 B CN103576050 B CN 103576050B
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capacitance type
potential transformer
type potential
state
individual event
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CN103576050A (en
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谢荣斌
周原
黄勇
王永刚
施平
蔡琨
张霖
刘波
陈实
杨超
张丽娟
申峻
王瑞果
黄盛洁
李钟萍
薛静
陈彦颋
何愈杰
张继平
李诗勇
王珺
蔡永炜
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Guiyang Power Supply Bureau
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Abstract

The present invention relates to a kind of running status appraisal procedure of capacitance type potential transformer, data acquisition is carried out to the running status of capacitance type potential transformer, the data gathered are classified and processed, as the foundation assessed the running status of capacitance type potential transformer, the running status of capacitance type potential transformer is assessed, adopt association analysis method, set up the comprehensive state amount evaluation system of capacitance type potential transformer; Adopt individual event quantity of state score computation method and the overall score computation method of capacitance type potential transformer, the running status of capacitance type potential transformer is marked, propose the normal weight coefficient of each individual event quantity of state and comprehensive state amount, calculate the variable weight coefficient of each comprehensive state amount; According to score and the variable weight coefficient of each comprehensive state amount, calculate the overall score of capacitance type potential transformer; The running status of capacitance type potential transformer is judged again according to the situation of the overall score of capacitance type potential transformer.

Description

A kind of running status appraisal procedure of capacitance type potential transformer
Technical field
The invention belongs to power transmission and transforming equipment technical field, particularly a kind of running status appraisal procedure of capacitance type potential transformer.
Background technology
Voltage transformer (VT) is one of key equipment in electric system, improves the operational reliability of voltage transformer (VT), no matter for the safe and reliable operation of whole electrical network, or reduce operation of power networks cost all tool be of great significance.Will improve it to safeguard and required level of service in the operational process of voltage transformer (VT), the assessment running status of voltage transformer (VT) being carried out to science is very necessary.In recent years, along with the further investigation of repair based on condition of component theory, state estimation technology have also been obtained increasing attention, and relevant capacitance type potential transformer, coupling condenser state evaluation result in relative state evaluating method and continue to bring out.As: based on Bayesian appraisal procedure, based on the appraisal procedure of evidential reasoning, based on the appraisal procedure of grey target theory, based on the appraisal procedure of support vector machine, based on the appraisal procedure of artificial neural network, based on opening up theoretical appraisal procedure etc.These above-mentioned methods all have the feature that can process rapidly magnanimity information, in engineering practice, also achieve good effect.But applicant is found by research, most appraisal procedures are wherein all the research laying particular emphasis on theoretical method, ignore the analysis of the correlativity of each quantity of state to reflection capacitance type potential transformer running status, especially the inner link between various information is not noted, and in the deterministic process of weight coefficient, be easier to the subjective suggestion adding individual, thus have influence on the accuracy of final assessment result.Secondly, applicant also finds, due to the complicacy of capacitance type potential transformer failure process, need comprehensively to analyze to the measured data of reflection capacitance type potential transformer latent defect and its probability of malfunction incidence relation, but indented material does not give necessary attention.Saying in a sense, is very important to reflecting that the measured data of capacitance type potential transformer latent defect and its probability of malfunction incidence relation carries out comprehensively analyzing.
Summary of the invention
The object of the invention is, for the deficiencies in the prior art, a kind of running status appraisal procedure of capacitance type potential transformer is proposed, it is a kind of capacitance type potential transformer running status Fuzzy Synthetic Evaluation based on quantity of state association analysis and Variable Weight Theory of Factor Space, and it can reflect true running status and the general level of the health of capacitance type potential transformer exactly.
Technical solution of the present invention is, data acquisition is carried out to the state of capacitance type potential transformer, the data gathered are classified and processed, as the foundation of assessment capacitance type potential transformer state, the data gathered comprise some individual event quantity of states, it is characterized in that: set up capacitance type potential transformer comprehensive state amount evaluation system, the running status of capacitance type potential transformer is assessed, by the Classification Management to individual event quantity of state, adopt association analysis method that the individual event quantity of state of the contact that intercouples is integrated into some comprehensive state amounts, essential elements of evaluation using comprehensive state amount as capacitance type potential transformer integrality, adopt the overall score computation method of individual event quantity of state score computation method, capacitance type potential transformer, the running status of capacitance type potential transformer is marked, the statistical calculation method of correlation rule is adopted to calculate normal weight coefficient and variable weight coefficient, for reflecting the weight size shared by each quantity of state according to the probabilistic correlation fact, according to score and the variable weight coefficient of each comprehensive state amount, calculate the overall score of capacitance type potential transformer, judge the running status of capacitance type potential transformer according to the situation of the overall score of capacitance type potential transformer, in the judgement of assessment result, adopt the method for fuzzy theory, half is used trapezoidally to set up the final overall score (relative inferiority degree) of the capacitance type potential transformer subordinate function corresponding with malfunction grade with Triangle-Profile, by the relation quantification of overall score final for capacitance type potential transformer and state grade, strengthen the accuracy of evaluation system, its basic step comprises:
1) carry out data acquisition, obtain the data of the individual event quantity of state of following the running status of capacitance type potential transformer to be correlated with, individual event quantity of state specifically comprises: insulation resistance between capacitor pole, capacitive divider medium consumption factor, capacitive divider electric capacity, capacitor leakage of oil situation, temperature rise, shelf depreciation, run the sound, capacitor external insulation surface condition, intermediate transformer Secondary Winding insulation resistance, secondary voltage variable quantity, intermediate transformer leakage of oil situation, damping resistance, the oil level of intermediate transformer, middle pressure becomes, secondary terminal box, base corrosion situation, down conductor conducting situation, high-voltage connection connection and lead-in wire corrosion situation,
2) carry out Data classification arrangement, set up capacitance type potential transformer comprehensive state amount evaluation system:
On the basis of carrying out data acquisition, adopt association analysis method, in conjunction with the failure condition in capacitance type potential transformer actual motion, taxonomic revision is carried out to the data of the individual event quantity of state that the running status of capacitance type potential transformer is correlated with, the individual event quantity of state of the contact that intercouples is integrated into some comprehensive state amounts, sets up capacitance type potential transformer synthetical condition assessment system;
3) significance level of foundation individual event quantity of state and comprehensive state amount, provides the normal weight coefficient of each individual event quantity of state and comprehensive state amount; Normal weight coefficient is fixed numbers in computation process;
4) quote the formula in " power transmission and transformation equipment state overhauling testing regulations " (Q/GDW168-2008), calculate the score of each individual event quantity of state respectively, the formula quoted is:
x j = z ′ - z j z ′ - z f × 100 (formula 1)
Wherein, x jfor the score value of a jth individual event quantity of state, work as x jduring < 0, make x j=0; Work as x j> 100, makes x j=100; z jfor this trial value to be assessed; The warning value that z ' is individual event quantity of state, if individual event quantity of state provides demand value z a, then z '=1.3z a(just deterioration) or z '=z athe negative deterioration of/1.3(); z ffor the initial value of this individual event quantity of state, i.e. this equipment factory-said value or commissioning test value;
5) according to score and the normal weight coefficient of each individual event quantity of state, the score of each comprehensive state amount of formulae discovery is adopted; The formula adopted is:
Y i=x 1w i, 1+ ... + x jw i,j+ x mw i,m, (j=1,2,3 ... m) (formula 2)
Wherein, y ibe i-th comprehensive state amount scoring, m is the number of the individual event quantity of state comprised in this comprehensive state amount, x jfor the score value of a jth individual event quantity of state, w i,jit is the normal weight coefficient of a jth individual event quantity of state in i-th comprehensive state amount;
6) according to the scoring event of each comprehensive state amount, adopt the variable weight coefficient of each comprehensive state amount of formulae discovery, the formula of employing is:
w i v = w i y i / &Sigma; p = 1 n w p y p (formula 3)
Wherein, be the variable weight coefficient of i-th comprehensive state amount, y ibe i-th comprehensive state amount scoring, n is the number of comprehensive state amount in capacitance type potential transformer comprehensive state amount system, w ibe the normal weight coefficient of i-th comprehensive state amount, w pbe the normal weight coefficient of p comprehensive state amount, y pit is the score of p comprehensive state amount;
7) according to score and the variable weight coefficient of each comprehensive state amount, adopt the overall score of formulae discovery capacitance type potential transformer, the formula of employing is:
R = y 1 w 1 v + . . . + y i w i v . . . + y n w n v , ( i = 1,2,3 . . . n ) (formula 4)
Wherein, R is the overall score of capacitance type potential transformer, and n is the number of comprehensive state amount in capacitance type potential transformer comprehensive state amount system, y ibe that i-th comprehensive state measures point, it is the variable weight coefficient of i-th comprehensive state amount;
8) adopt the method for fuzzy theory, utilize the degree of membership in fuzzy theory and relative inferiority degree to process assessment result; For the overall score that capacitance type potential transformer is final, definition relative inferiority degree is t=g (R):
t = g ( R ) = 100 - R 100 (formula 5)
Utilize half trapezoidal and Triangle-Profile, set up the subordinate function that the final overall score (relative inferiority degree) of capacitance type potential transformer is corresponding with malfunction grade, concrete subordinate function is:
Subordinate function during normal condition:
&mu; 1 ( t ) = 2 - 5 t 0.2 < t < 0.4 1 t &le; 0.2 0 t &GreaterEqual; 0.4 (formula 6)
Subordinate function during attention state:
(formula 7)
Subordinate function during abnormality:
(formula 8)
Subordinate function during severe conditions:
&mu; 4 ( t ) = 1 t &GreaterEqual; 0.8 5 t - 3 0.6 < t < 0.8 0 t &le; 0.6 (formula 9)
The assessment result matrix form being obtained capacitance type potential transformer by above-mentioned formula 6, formula 7, formula 8 and formula 9 is:
According to μ (t) max=max [μ 1(t) μ 2(t) μ 3(t) μ 4(t)] determine the final health status of capacitance type potential transformer.
It is characterized in that, obtain in the data of the individual event quantity of state of following the running status of capacitance type potential transformer to be correlated with, each individual event quantity of state requires that the data obtained comprise its measured value, demand value and initial value.
Creativeness of the present invention is: 1, establish the capacitance type potential transformer running status evaluation system based on preventive trial data, comprehensive analysis is adopted to carry out Classification Management to individual event quantity of state, individual event quantity of state closely will be connected each other and be integrated into a comprehensive state amount, the key element evaluated using comprehensive state amount as capacitance type potential transformer integrality, is conducive to the running status of accurate evaluation capacitance type potential transformer.2, adopt the method for correlation rule to calculate the normal weight coefficient of capacitance type potential transformer quantity of state, avoid the problem of the subjectivity too relying on expert opinion or experience, weight size shared by each quantity of state can be reflected according to objective fact.3, in the integrality scoring of capacitance type potential transformer, employ variable weight coefficient, under contributing to solving normal weight coefficient, accurately can not reflect the problem of the time of day of capacitance type potential transformer.4, for the final score value of capacitance type potential transformer and the indefinite feature of corresponding relation of malfunction, the method of fuzzy theory is adopted to carry out Fuzzy processing to it, the corresponding relation of the two is made to be tending towards accurate, this has certain scientific basis and theoretical foundation, creative compared with prior art formerly.
Advantage of the present invention is: it is novel in design, method is practical, the practical problems run in capacitance type potential transformer assessment can be solved, its appraisal procedure adopted rationally, simply, be easy to programming realization, and do not need a large amount of state estimation samples, just can judge the running status of capacitance type potential transformer fast.The present invention is a kind of comparatively efficient and rational appraisal procedure being applicable to the running status of capacitance type potential transformer, and compared with prior art, the present invention more can reflect true running status and the general level of the health of capacitance type potential transformer exactly.
Accompanying drawing explanation
Fig. 1, process flow diagram of the present invention.
Fig. 2, capacitance type potential transformer comprehensive state amount evaluation system schematic diagram of the present invention.
The subordinate function schematic diagram that the final overall score (relative inferiority degree) of Fig. 3, capacitance type potential transformer of the present invention is corresponding with malfunction grade.
Fig. 4, capacitance type potential transformer comprehensive state amount evaluation system instance graph of the present invention.
Embodiment
Below, embodiments of the invention are described in detail with reference to the accompanying drawings.
According to the technical solution that the present invention proposes, using a capacitance type potential transformer in certain the 220kV transformer station belonging to electric company of Guizhou Province as application an example of the present invention.
As shown in Figure 1, the present invention has used the correlation theory of association analysis and factor Spaces, propose a kind of running status appraisal procedure of capacitance type potential transformer, it is a kind of capacitance type potential transformer running status Fuzzy Synthetic Evaluation based on quantity of state association analysis and Variable Weight Theory of Factor Space.
Application the present invention, first be that data acquisition is carried out to capacitance type potential transformer state, next be exactly that the data of the capacitance type potential transformer state (comprising running status) gathered are classified and processed, to truly reflect the data of capacitance type potential transformer state (comprising running status), as the foundation of assessment capacitance type potential transformer state, capacitance type potential transformer state is assessed, adopt association analysis method, set up the comprehensive state amount evaluation system of capacitance type potential transformer, adopt individual event quantity of state score computation method, the overall score computation method of capacitance type potential transformer, the utilization state of capacitance type potential transformer is marked, the normal weight coefficient of each individual event quantity of state and comprehensive state amount is proposed, calculate the variable weight coefficient of each comprehensive state amount, according to score and the variable weight coefficient of each comprehensive state amount, calculate the overall score of capacitance type potential transformer.The running status of capacitance type potential transformer is judged according to the situation of the overall score of capacitance type potential transformer.In the judgement of assessment result, introduce the method for fuzzy theory, half is used trapezoidally to set up the final overall score (relative inferiority degree) of the capacitance type potential transformer subordinate function corresponding with malfunction grade with Triangle-Profile, by the relation quantification of overall score final for capacitance type potential transformer and state grade, further enhancing the accuracy of evaluation system.
Specific embodiment of the invention step is as follows:
1) data collection task is carried out, the data of the individual event quantity of state of being correlated with the running status obtained with capacitance type potential transformer and information.The data of individual event quantity of state specifically comprise: insulation resistance between capacitor pole, capacitive divider medium consumption factor, capacitive divider electric capacity, capacitor leakage of oil situation, temperature rise, shelf depreciation, run the sound, capacitor external insulation surface condition, intermediate transformer Secondary Winding insulation resistance, secondary voltage variable quantity, intermediate transformer leakage of oil situation, damping resistance, the oil level of intermediate transformer, middle pressure becomes, secondary terminal box, base corrosion situation, down conductor conducting situation, high-voltage connection connection and lead-in wire corrosion situation etc.
2) carry out Data classification arrangement, set up capacitance type potential transformer comprehensive state amount evaluation system:
On the basis of carrying out data acquisition, according to association analysis correlation theory, adopt association analysis method, in conjunction with the failure condition in capacitance type potential transformer actual motion, taxonomic revision is carried out to the data of the individual event quantity of state of capacitance type potential transformer, the individual event quantity of state of the contact that intercouples is integrated into some comprehensive state amounts, sets up capacitance type potential transformer comprehensive state amount evaluation system.
3) significance level of foundation individual event quantity of state and comprehensive state amount, provides the normal weight coefficient of each individual event quantity of state and comprehensive state amount.Normal weight coefficient is fixed numbers in computation process, except non-artificial amendment, otherwise can not change.The normal weight coefficient of each individual event quantity of state is as shown in table 1.
The normal weight coefficient of table 1 individual event quantity of state
Individual event quantity of state Normal weight coefficient
Insulation resistance between capacitor pole 0.2
Capacitive divider medium consumption factor 0.2
Capacitive divider electric capacity 0.2
Capacitor leakage of oil situation 0.360
Temperature rise 1
Shelf depreciation 0.2
Run the sound 0.135
Capacitor external insulation surface condition 0.135
Intermediate transformer Secondary Winding insulation resistance 0.2
Secondary voltage variable quantity 1
Intermediate transformer leakage of oil situation 0.135
Damping resistance 0.405
Middle oil level 0.135
Middle pressure becomes 0.018
Secondary terminal box 0.018
Base corrosion situation 0.018
Down conductor conducting situation 0.483
High-voltage connection connection 0.112
Lead-in wire corrosion situation 0.046
The normal weight coefficient of each comprehensive state amount is as shown in table 2.
The normal weight coefficient of table 2 comprehensive state amount
Comprehensive state amount Normal weight coefficient
Electric property 0.25
Electric conductivity 0.25
Secondary voltage 0.1
Temperature rise 0.2
Outward appearance 0.2
4) computing formula by reference in " power transmission and transformation equipment state overhauling testing regulations " (Q/GDW168-2008), calculates the score of each individual event quantity of state respectively.Its computing formula quoted is:
x j = z &prime; - z j z &prime; - z f &times; 100 (formula 1)
Wherein, x jfor the score value of a jth individual event quantity of state, work as x jduring < 0, make x j=0; Work as x j> 100, makes x j=100; z jfor this trial value to be assessed; The warning value that z ' is individual event quantity of state is (if individual event quantity of state provides demand value z a, then z '=1.3z a(just deterioration) or z '=z athe negative deterioration of/1.3(); z ffor the initial value of this individual event quantity of state, i.e. this equipment factory-said value or commissioning test value;
The data gathered in step 1) substitution (formula 1) are calculated each individual event quantity of state score as shown in table 3.
Table 3 individual event quantity of state score
Individual event quantity of state Score x j
Insulation resistance between capacitor pole 55.0
Capacitive divider medium consumption factor 35.7
Capacitive divider electric capacity 50.4
Capacitor leakage of oil situation 35.8
Temperature rise 76.0
Shelf depreciation 25.7
Run the sound 86.8
Capacitor external insulation surface condition 91.7
Intermediate transformer Secondary Winding insulation resistance 35.8
Secondary voltage variable quantity 96.1
Intermediate transformer leakage of oil situation 43.7
Damping resistance 98.6
The oil level of intermediate transformer 57.8
Middle pressure becomes 94.8
Secondary terminal box 88.0
Base corrosion situation 97.4
Down conductor conducting situation 97.0
High-voltage connection connection 95.0
Lead-in wire corrosion situation 98.6
5) score of each comprehensive state amount is calculated according to the score of each individual event quantity of state and normal weight coefficient.The computing formula quoted is:
Y i=x 1w i, 1+ ... + x jw i,j+ x mw i,m, (j=1,2,3 ... m) (formula 2)
Wherein, y ibe the scoring of i-th comprehensive state amount, the individual event quantity of state number that m comprises in comprehensive state amount for this reason, x jfor the score value of a jth individual event quantity of state, w i,jit is the normal weight coefficient of a jth individual event quantity of state in i-th comprehensive state amount;
Data in table 1 and table 3 are substituted into (formula 2) is middle to be calculated, comprehensive state can be obtained and measure point as shown in table 4.
Table 4 comprehensive state measures point
Comprehensive state amount Score y i
Electric property 40.5
Electric conductivity 97.4
Secondary voltage 96.1
Temperature rise 76.0
Outward appearance 60.3
6) according to scoring event and the normal weight coefficient of each comprehensive state amount, the variable weight coefficient of each comprehensive state amount of formulae discovery is adopted.The formula adopted is:
w i v = w i y i / &Sigma; p = 1 n w p y p (formula 3)
Wherein, be the variable weight coefficient of i-th comprehensive state amount, y ibe i-th comprehensive state amount scoring, n is the number of comprehensive state amount in capacitance type potential transformer comprehensive state amount system, w ibe the normal weight coefficient of i-th comprehensive state amount, w pbe the normal weight coefficient of p comprehensive state amount, y pit is the score of p comprehensive state amount.
Data in table 2 and table 4 being substituted into (formula 3), can to obtain the variable weight coefficient of each comprehensive state amount as shown in table 5.
Table 5 comprehensive state quantitative change weight coefficient
Comprehensive state amount Variable weight coefficient
Electric property 0.392
Electric conductivity 0.163
Secondary voltage 0.066
Temperature rise 0.167
Outward appearance 0.212
7) according to score and the variable weight coefficient of each comprehensive state amount, the overall score of formulae discovery capacitance type potential transformer is adopted.The formula adopted is:
R = y 1 w 1 v + . . . + y i w i v . . . + y n w n v , ( i = 1,2,3 . . . n ) (formula 4)
Wherein, R is the overall score of capacitance type potential transformer, and n is the number of comprehensive state amount in capacitance type potential transformer comprehensive state amount system, y ibe i-th comprehensive state amount scoring, it is the variable weight coefficient of i-th comprehensive state amount;
Table 4 and the data in table 5 are substituted into (formula 4) and the overall score R=63.57 of capacitance type potential transformer can be obtained.
8) adopt fuzzy method, utilize the degree of membership in fuzzy theory and relative inferiority degree to process assessment result.The present invention is directed to the overall score that capacitance type potential transformer is final, definition relative inferiority degree is t=g (R):
t = g ( R ) = 100 - R 100 (formula 5)
It is 0.3643 that overall score substitution (formula 5) of capacitance type potential transformer step 7) calculated can obtain the overall score impairment grade of capacitance type potential transformer.
The present invention utilizes half trapezoidal and Triangle-Profile, sets up the subordinate function that capacitance type potential transformer final integral score (relative inferiority degree) is corresponding with malfunction grade.Concrete subordinate function is as follows:
Subordinate function during normal condition:
&mu; 1 ( t ) = 2 - 5 t 0.2 < t < 0.4 1 t &le; 0.2 0 t &GreaterEqual; 0.4 (formula 6)
Subordinate function during attention state:
(formula 7)
Subordinate function during abnormality:
(formula 8)
Subordinate function during severe conditions:
&mu; 4 ( t ) = 1 t &GreaterEqual; 0.8 5 t - 3 0.6 < t < 0.8 0 t &le; 0.6 (formula 9)
The assessment result matrix form that can be obtained capacitance type potential transformer by above formula 6, formula 7, formula 8 and formula 9 is:
According to μ (t) max=max [μ 1(t) μ 2(t) μ 3(t) μ 4(t)] the final health status of capacitance type potential transformer can be determined.
The assessment result matrix form that can calculate this capacitance type potential transformer according to (formula 6) ~ (formula 9) is:
It can thus be appreciated that this capacitance type potential transformer running status is in attention state.
Strategies of Maintenance: should overhaul according to actual conditions schedule ahead C class, suitably strengthens the maintenance of D class.The fault type of capacitance type potential transformer should be noted simultaneously.Because can find out that electric property score is starkly lower than other comprehensive state amounts by the scoring event of comprehensive state amount, this is the fault type that can reflect capacitance type potential transformer intuitively, can provide certain guidance for service work.
As shown in Figure 2, the information of the individual event state of capacitance type potential transformer state can directly be obtained by data collection task, then according to association analysis correlation theory, adopt association analysis method, in conjunction with the failure condition of capacitance type potential transformer in actual motion, taxonomic revision is carried out to the data of the individual event quantity of state of the capacitance type potential transformer obtained by data collection task, the individual event quantity of state that several correlation degrees are higher forms a comprehensive state amount, finally in units of comprehensive state amount, carries out state estimation calculating to capacitance type potential transformer.
Shown in Fig. 3, the subordinate function schematic diagram that the final overall score (relative inferiority degree) of capacitance type potential transformer of the present invention is corresponding with malfunction grade.Relative inferiority degree be used to the current virtual condition of characterization device compared with malfunction time deterioration relatively a quantitative target of degree, span is 0 ~ 1.Subordinate function represents the border of fuzzy set, and degree of membership is determined by subordinate function, and its variation range is the arbitrary serial number between 0 ~ 1.When the degree of membership of certain index is " 0 ", characterizes this index and do not belong to this fuzzy set; When its degree of membership is " 1 ", characterizes this index and belong to this fuzzy set completely; It is subordinate to angle value between 0 ~ 1, then characterizes the degree that this index belongs to this fuzzy set.Concrete subordinate function is as shown in (formula 6) ~ (formula 9).
As shown in Figure 4, capacitance type potential transformer is divided into 5 comprehensive state amounts such as electric property, electric conductivity, secondary voltage, temperature rise, outward appearance.Wherein electric property comprises 5 individual event quantity of states such as insulation resistance between capacitor pole, capacitive divider medium consumption factor, capacitive divider electric capacity, shelf depreciation, intermediate transformer Secondary Winding insulation resistance; Electric conductivity comprises 3 individual event quantity of states such as damping resistance, down conductor conducting situation, high-voltage connection connection; Secondary voltage comprises secondary voltage variable quantity 1 individual event quantity of state; Temperature rise comprises temperature rise 1 individual event quantity of state; Outward appearance comprises 9 individual event quantity of states such as capacitor leakage of oil situation, the operation sound, capacitor external insulation surface condition, intermediate transformer leakage of oil situation, the oil level of intermediate transformer, the change of middle pressure, secondary terminal box, base corrosion situation, lead-in wire corrosion situation.
Be more than preferred embodiments of the present invention, but the present invention should not be confined to the content disclosed in this example and accompanying drawing.Every do not depart from technical solution proposed by the invention under the equivalence that completes or modification, all fall into the scope of protection of the invention.

Claims (2)

1. the running status appraisal procedure of a capacitance type potential transformer, data acquisition is carried out to the state of capacitance type potential transformer, the data gathered are classified and processed, as the foundation of assessment capacitance type potential transformer state, the data gathered comprise some individual event quantity of states, it is characterized in that: set up capacitance type potential transformer comprehensive state amount evaluation system, the running status of capacitance type potential transformer is assessed, by the Classification Management to individual event quantity of state, adopt association analysis method that the individual event quantity of state of the contact that intercouples is integrated into some comprehensive state amounts, essential elements of evaluation using comprehensive state amount as capacitance type potential transformer integrality, adopt the overall score computation method of individual event quantity of state score computation method, capacitance type potential transformer, the running status of capacitance type potential transformer is marked, the statistical calculation method of correlation rule is adopted to calculate normal weight coefficient and variable weight coefficient, for reflecting the weight size shared by each quantity of state according to the probabilistic correlation fact, according to score and the variable weight coefficient of each comprehensive state amount, calculate the overall score of capacitance type potential transformer, judge the running status of capacitance type potential transformer according to the situation of the overall score of capacitance type potential transformer, in the judgement of assessment result, adopt the method for fuzzy theory, half is used trapezoidally to set up the final overall score of capacitance type potential transformer with Triangle-Profile---the subordinate function that relative inferiority degree is corresponding with malfunction grade, by the relation quantification of overall score final for capacitance type potential transformer and state grade, strengthen the accuracy of evaluation system, its basic step comprises:
1) carry out data acquisition, obtain the data of the individual event quantity of state of following the running status of capacitance type potential transformer to be correlated with, individual event quantity of state specifically comprises: insulation resistance between capacitor pole, capacitive divider medium consumption factor, capacitive divider electric capacity, capacitor leakage of oil situation, temperature rise, shelf depreciation, run the sound, capacitor external insulation surface condition, intermediate transformer Secondary Winding insulation resistance, secondary voltage variable quantity, intermediate transformer leakage of oil situation, damping resistance, the oil level of intermediate transformer, middle pressure becomes, secondary terminal box, base corrosion situation, down conductor conducting situation, high-voltage connection connection and lead-in wire corrosion situation,
2) carry out Data classification arrangement, set up capacitance type potential transformer comprehensive state amount evaluation system:
On the basis of carrying out data acquisition, adopt association analysis method, in conjunction with the failure condition in capacitance type potential transformer actual motion, taxonomic revision is carried out to the data of the individual event quantity of state that the running status of capacitance type potential transformer is correlated with, the individual event quantity of state of the contact that intercouples is integrated into some comprehensive state amounts, sets up capacitance type potential transformer synthetical condition assessment system;
3) significance level of foundation individual event quantity of state and comprehensive state amount, provides the normal weight coefficient of each individual event quantity of state and comprehensive state amount; Normal weight coefficient is fixed numbers in computation process;
4) quote the formula in " power transmission and transformation equipment state overhauling testing regulations " Q/GDW168-2008, calculate the score of each individual event quantity of state respectively, the formula quoted is:
x j = z &prime; - z j z &prime; - z f &times; 100 (formula 1)
Wherein, x jfor the score value of a jth individual event quantity of state, work as x jduring < 0, make x j=0; Work as x j> 100, makes x j=100; z jfor this trial value to be assessed; The warning value that z ' is individual event quantity of state, if individual event quantity of state provides demand value z a, then z '=1.3z apositive deterioration or z '=z a/ 1.3 negative deteriorations; z ffor the initial value of this individual event quantity of state, i.e. this equipment factory-said value or commissioning test value;
5) according to score and the normal weight coefficient of each individual event quantity of state, the score of each comprehensive state amount of formulae discovery is adopted; The formula adopted is:
Y i=x 1w i, 1+ ... + x jw i,j+ x mw i,m, (j=1,2,3 ... m) (formula 2)
Wherein, y ibe i-th comprehensive state amount scoring, m is the number of the individual event quantity of state comprised in this comprehensive state amount, x jfor the score value of a jth individual event quantity of state, w i,jit is the normal weight coefficient of a jth individual event quantity of state in i-th comprehensive state amount;
6) according to the scoring event of each comprehensive state amount, adopt the variable weight coefficient of each comprehensive state amount of formulae discovery, the formula of employing is:
w i v = w i y i / &Sigma; y i n w p y p (formula 3)
Wherein, be the variable weight coefficient of i-th comprehensive state amount, y ibe i-th comprehensive state amount scoring, n is the number of comprehensive state amount in capacitance type potential transformer comprehensive state amount system, w ibe the normal weight coefficient of i-th comprehensive state amount, w pbe the normal weight coefficient of p comprehensive state amount, y pit is the score of p comprehensive state amount;
7) according to score and the variable weight coefficient of each comprehensive state amount, adopt the overall score of formulae discovery capacitance type potential transformer, the formula of employing is:
R = y 1 w 1 v + ... + y i w i v ... + y n w n v , ( i = 1 , 2 , 3 ... n ) (formula 4)
Wherein, R is the overall score of capacitance type potential transformer, and n is the number of comprehensive state amount in capacitance type potential transformer comprehensive state amount system, y ibe that i-th comprehensive state measures point, it is the variable weight coefficient of i-th comprehensive state amount;
8) adopt the method for fuzzy theory, utilize the degree of membership in fuzzy theory and relative inferiority degree to process assessment result; For the overall score that capacitance type potential transformer is final, definition relative inferiority degree is t=g (R):
t = g ( R ) = 100 - R 100 (formula 5)
Utilize half trapezoidal and Triangle-Profile, set up the overall score that capacitance type potential transformer is final---the subordinate function that relative inferiority degree is corresponding with malfunction grade, concrete subordinate function is:
Subordinate function during normal condition:
&mu; 1 ( t ) = 2 - 5 t 0.2 < t < 0.4 1 t &le; 0.2 0 t &GreaterEqual; 0.4 (formula 6)
Subordinate function during attention state:
(formula 7)
Subordinate function during abnormality:
(formula 8)
Subordinate function during severe conditions:
&mu; 4 ( t ) = 1 t &GreaterEqual; 0.8 5 t - 3 0.6 < t < 0.8 0 t &le; 0.6 (formula 9)
The assessment result matrix form being obtained capacitance type potential transformer by above-mentioned formula 6, formula 7, formula 8 and formula 9 is:
Normal attention is abnormal serious
[μ 1(t)μ 2(t)μ 3(t)μ 4(t)]
According to μ (t) max=max [μ 1(t) μ 2(t) μ 3(t) μ 4(t)] determine the final health status of capacitance type potential transformer.
2. the running status appraisal procedure of a kind of capacitance type potential transformer according to claim 1, it is characterized in that, obtain in the data of the individual event quantity of state of following the running status of capacitance type potential transformer to be correlated with, each individual event quantity of state requires that the data obtained comprise its measured value, demand value and initial value.
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