CN109657817A - A kind of distribution transformer health evaluating method - Google Patents
A kind of distribution transformer health evaluating method Download PDFInfo
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Abstract
This application discloses a kind of distribution transformer health evaluating methods, which comprises according to the evaluation index of distribution transformer, constructs distribution transformer health evaluating target layers structural model；Calculate the subjective weight and objective weight of the evaluation index；According to the subjective weight and the objective weight, comprehensive weight is calculated；According to the comprehensive weight, the evaluation index weighted sum is calculated, obtains distribution transformer health status comprehensive score；Distribution transformer is ranked up according to the distribution transformer health status comprehensive score.Distribution transformer health evaluating method, which avoids, in the application only relies on analytic hierarchy process (AHP) weight setting excessively subjectivity and leads to the volatile genuine problem of assessment result, by calculating subjective weight and objective weight, realize more accurate distribution transformer health evaluating, maintenance personnel is helped to grasp distribution transformer health status in time comprehensively, so that enterprise arranges distribution transformer maintenance work in time, reduces distribution transformer failure and occur.
Description
Technical field
This application involves power distribution network O&M technical field more particularly to a kind of distribution transformer health evaluating methods.
Background technique
Distribution transformer, abbreviation distribution transforming, assign in electric system alternating voltage and electric current are converted according to the law of electromagnetic induction and
Transmit a kind of static electric appliance of AC energy.Distribution transformer directly facing terminal user, the general level of the health and operation conditions
Quality is directly related to power supply safety and reliability.Distribution transformer is as grid company critical asset, currently, each bulk power grid is public
Department attaches great importance to distribution transforming health examination work, relies primarily on system monitoring and combines artificial periodically inspection mode, completes distribution transforming failure
Or abnormal reparation.
Currently, generalling use analytic hierarchy process (AHP), referred to as AHP sets initial weight, constructs distribution transformer health evaluating
System.Initial weight is set specifically, being compared two-by-two using 1-9 scaling law same layer index, is obtained relative to same
The judgment matrix of upper layer element, then calculate an initial relative weighting for index subsystem, that is, seek the feature of the judgment matrix of foundation
Then vector carries out consistency check to initial weight value, finally calculate initial total level weight.
During above-mentioned distribution transformer health evaluating system construction, initial power is calculated only with analytic hierarchy process (AHP)
Weight, since the index weights of analytic hierarchy process (AHP) mainly rely on expertise to be set, distribution transformer health evaluating result compared with
For subjectivity, true distribution transformer health status can not be accurately held.Therefore, it needs to design a kind of distribution transformer health evaluating
Method.
Summary of the invention
This application provides a kind of distribution transformer health evaluating methods, to solve in the prior art due to distribution transformer
Health evaluating result is more subjective, thus the technical issues of can not accurately holding true distribution transformer health status.
In order to solve the above-mentioned technical problem, the embodiment of the present application discloses following technical solution:
The embodiment of the present application discloses a kind of distribution transformer health evaluating method, which comprises
According to the evaluation index of distribution transformer, distribution transformer health evaluating target layers structural model is constructed, it is described
Evaluation index includes: arrival probability of acceptance of spot check, full inspection qualification rate, online rate, acquisition percentage of head rice, failure rate and a repair rate；
Calculate the subjective weight and objective weight of the evaluation index；
According to the subjective weight and the objective weight, comprehensive weight is calculated；
According to the comprehensive weight, the evaluation index weighted sum is calculated, it is comprehensive to obtain distribution transformer health status
Score；
Distribution transformer is ranked up according to the distribution transformer health status comprehensive score.
Optionally, in above-mentioned distribution transformer health evaluating method, according to the evaluation index of distribution transformer, building is matched
Piezoelectric transformer health evaluating target layers structural model, comprising:
Distribution transforming health evaluating A is set as destination layer；
By distribution transforming quality inspection situation B1, distribution transforming operating condition B2, distribution transforming maintenance quality B3It is set as indicator layer；
By two quality inspection index C of the arrival probability of acceptance of spot check and full inspection qualification rate1j(j=1,2) it is set as described with rotten
Examine situation B1Sub- indicator layer；By the online rate and acquisition two operating index C of percentage of head rice2j(j=1,2) it is set as the distribution transforming
Operating condition B2Sub- indicator layer；By two maintenance index C of the failure rate and a repair rate3j(j=1,2) it is set as described to match
Become maintenance quality B3Sub- indicator layer.
Optionally, in above-mentioned distribution transformer health evaluating method, the subjective weight for calculating the evaluation index,
Include:
It is x according to the importance ranking that Scale-Extending obtains n index1≥x2≥...≥xn；
To xiWith xi+1It is compared, the corresponding scale value of the index is denoted as ti, wherein i 1-n；
According to the transitivity of the index significance level, judgment matrix R is obtained, the judgment matrix R is indicated are as follows:
Successively obtain mark layer B1jTo the judgment matrix of destination layer A, sub- indicator layer C1jTo indicator layer B1Judgment matrix, son refers to
Mark layer C2jTo indicator layer B2Judgment matrix, sub- indicator layer C3jTo indicator layer B3Judgment matrix；
According to judgment matrix, the subjective weight W of the evaluation index of the distribution transformer is calculatedj,1。
Optionally, in above-mentioned distribution transformer health evaluating method, the objective weight for calculating the evaluation index,
Include:
According to n kind distribution transformer and m evaluation index, evaluations matrix R ' is obtained, is indicated are as follows:
Element in the evaluations matrix R ' is standardized, R=(r is obtainedij)m×n, in formula, rijFor i-th kind of distribution transforming
J-th of evaluation index numerical value, i 1-n, j 1-m；
The entropy of j-th of evaluation index is calculated, is indicated are as follows:In formula: k=ln (n),
The objective weight of the evaluation index of the distribution transformer is calculated, is indicated are as follows:
Optionally, in above-mentioned distribution transformer health evaluating method, the element in the evaluations matrix R ' is marked
Standardization, comprising:
When evaluation index is high excellent index, standardization formula is indicated are as follows:
When evaluation index is low excellent index, standardization formula is indicated are as follows:
Optionally, in above-mentioned distribution transformer health evaluating method, according to the subjective weight and the objective weight,
Calculate comprehensive weight, comprising:
According to the subjective weight Wj,1With the objective weight Wj,2, comprehensive weight W is calculatedj, calculation formula is such as
Under:
Optionally, in above-mentioned distribution transformer health evaluating method, according to the comprehensive weight, the assessment is calculated
Index weighted sum obtains distribution transformer health status comprehensive score, comprising:
According to the distribution transformer health evaluating target layers structural model, pass through the comprehensive weight WjWith it is described
Evaluation index obtains distribution transformer health status comprehensive score.
Compared with prior art, the application has the beneficial effect that
This application provides a kind of distribution transformer health evaluating methods, which comprises according to distribution transformer
Evaluation index, constructs distribution transformer health evaluating target layers structural model, and the evaluation index includes: that arrival sampling observation is qualified
Rate, full inspection qualification rate, online rate, acquisition percentage of head rice, failure rate and a repair rate；Calculate the subjective power of the evaluation index
Weight and objective weight；According to the subjective weight and the objective weight, comprehensive weight is calculated；According to the comprehensive power
Weight, calculates the evaluation index weighted sum, obtains distribution transformer health status comprehensive score；It is strong according to the distribution transformer
Health state comprehensive score is ranked up.Distribution transformer health evaluating method in the application, which avoids, only relies on analytic hierarchy process (AHP)
Weight setting excessively subjectivity leads to the volatile genuine problem of assessment result, by calculating subjective weight and objective weight, realizes more
Accurate distribution transformer health evaluating, helps maintenance personnel to grasp distribution transformer health status in time comprehensively, so as to enterprise
Distribution transformer maintenance work is arranged in time, is reduced distribution transformer failure and is occurred.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The application can be limited.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is a kind of flow diagram of distribution transformer health evaluating method provided in an embodiment of the present invention；
Fig. 2 is distribution transformer health evaluating target layers structural model figure provided in an embodiment of the present invention.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, the common skill in this field
The application protection all should belong in art personnel every other embodiment obtained without making creative work
Range.
It is a kind of flow diagram of distribution transformer health evaluating method provided in an embodiment of the present invention referring to Fig. 1.Knot
Close Fig. 1 can obtain, distribution transformer health evaluating method provided by the present application the following steps are included:
Step S101: according to the evaluation index of distribution transformer, distribution transformer health evaluating target layers structure is constructed
Model, the evaluation index include: arrival probability of acceptance of spot check, full inspection qualification rate, online rate, acquisition percentage of head rice, failure rate and one
Secondary repair rate；
By the analysis to distribution transformer operation/maintenance data, distribution transformer health evaluating includes three aspects: distribution transforming quality inspection
Situation, distribution transforming operating condition and distribution transforming maintenance condition, wherein totally six indexs: arrival probability of acceptance of spot check, full inspection qualification rate,
Line rate, acquisition percentage of head rice, failure rate, a repair rate.Specifically, arrival probability of acceptance of spot check, full inspection qualification rate the two indexs
Reflect that distribution transforming quality inspection situation, online rate, acquisition the two indexs of percentage of head rice reflect distribution transforming operating condition, failure rate, primary reparation
The two indexs of rate reflect distribution transforming maintenance condition, can establish hierarchy Model according to these indexs, determine each index power
Weight indicates are as follows: Wj(j=1,2 ..., 6), obtain distribution transforming health status score by weighted average, realize to distribution transforming health shape
The comprehensive assessment of state.
It referring to fig. 2, is distribution transformer health evaluating target layers structural model figure provided in an embodiment of the present invention.By scheming
Shown in 2, distribution transforming health evaluating A is set as destination layer, distribution transforming quality inspection situation B in the application1, distribution transforming operating condition B2, distribution transforming maintenance
Quality B3It is set as indicator layer, two quality inspection index C of arrival probability of acceptance of spot check and full inspection qualification rate1j(j=1,2) it is set as distribution transforming quality inspection
Situation B1Sub- indicator layer, online rate and acquisition two operating index C of percentage of head rice2j(j=1,2) it is set as distribution transforming operating condition B2's
Sub- indicator layer, two maintenance index C of failure rate and a repair rate3j(j=1,2) it is set as distribution transforming maintenance quality B3Sub- index
Layer, establishes distribution transformer health evaluating target layers structural model.
Step S102: the subjective weight and objective weight of the evaluation index are calculated；
For the process for avoiding the consistency check in traditional analytic hierarchy process (AHP), assume to be obtained according to Scale-Extending in the application
Importance ranking to n index is x1≥x2≥...≥xn, to xiWith xi+1It is compared, wherein i is any one in 1-n,
The corresponding scale value of the index is denoted as ti, then calculated in judgment matrix according to the transitivity of the significance level of index
Other elements value finally obtains judgment matrix R, indicates are as follows:
The matrix is the positive reciprocal matrix of n × n rank it can be seen from above-mentioned judgment matrix R.Above-mentioned judgement square in the application
Battle array with by each index two-by-two compared with obtained judgment matrix compare, any two row element is proportional, by the just reciprocal square of n × n rank
Any two row element of battle array is proportional it may determine that the matrix meets consistency.In the application any two row element of judgment matrix at
Ratio reduces the calculating work that traditional analytic hierarchy process (AHP) lieutenant colonel tests consistency, and also solving traditional judgment matrix cannot pass through
Consistency desired result and cause the problem of can not evaluating.
In the application, by expert analysis mode, following judgment matrix is successively obtained:
Indicator layer B1jTo the judgment matrix of destination layer A, as shown in table 1.
Table 1:
| Distribution transforming quality inspection situation | Distribution transforming operating condition | Distribution transforming maintenance condition | |
| Distribution transforming quality inspection situation | 1 | 1/8 | 1/4 |
| Distribution transforming operating condition | 8 | 1 | 2 |
| Distribution transforming maintenance condition | 4 | 1/2 | 1 |
Sub- indicator layer C1jTo indicator layer B1Judgment matrix, as shown in table 2.
Table 2:
| Arrival probability of acceptance of spot check | Arrival full inspection qualification rate | |
| Arrival probability of acceptance of spot check | 1 | 1/4 |
| Arrival full inspection qualification rate | 4 | 1 |
Sub- indicator layer C2jTo indicator layer B2Judgment matrix, as shown in table 3.
Table 3:
| Online rate | Acquire percentage of head rice | |
| Online rate | 1 | 1/2 |
| Acquire percentage of head rice | 2 | 1 |
Sub- indicator layer C3jTo indicator layer B3Judgment matrix, as shown in table 4.
Table 4:
| Failure rate | Repair rate | |
| Failure rate | 1 | -0.5 |
| Repair rate | -2 | 1 |
According to the weight calculation method of above-mentioned each judgment matrix and analytic hierarchy process (AHP), first to each of above-mentioned judgment matrix
Column summation is normalized each column, obtains new matrix, then sums to new every a line of matrix, obtains feature
Vector, then be normalized, it obtains every layer of index weights, COMPREHENSIVE CALCULATING finally is carried out to every layer of index weights again and obtains this
The specific weight value of six indexs in application, i.e. subjective weight of six indexs in distribution transformer health evaluating, such as 5 institute of table
Show.
Table 5:
| Arrival probability of acceptance of spot check | Arrival full inspection qualification rate | Online rate | Acquire percentage of head rice | Failure rate | Repair rate |
| 0.009524 | 0.038095 | 0.108844 | 0.653061 | -0.06349 | 0.126984 |
That is Wj,1=(0.009524,0.038095,0.108844,0.653061, -0.06349,0.126984), by result
It is found that the weight coefficient of only failure rate is negative, illustrate that failure rate is opposite direction to the effect of distribution transforming health evaluating, i.e. failure rate
Higher, health condition is poorer.
The objective weight of each index is calculated in the application based on entropy assessment, entropy assessment is a kind of Objective Weighting, base
This thinking is to determine objective weight according to the size of index variability, can be used for the multiple evaluation indexes of multiple evaluation objects into
Row evaluation.In general, if the comentropy index weights of some index determine that the entropy weight of method is smaller, show that index value must make a variation
Degree is bigger, and the information content provided is more, can play the role of in overall merit also bigger, and weight is also bigger.Instead
It, weight is also just smaller.The weight selection of index is an important factor for influencing evaluation result, all with type distribution transforming core index
Have codes and standards, between without apparent gap, if to these setup measures higher weights, evaluation result tends to homogeneity
Change, using the Weight Determination based on entropy assessment, smaller weight, bigger difference are arranged compared with Small Indicators to same type distribution transforming difference
Setup measures greater weight avoids evaluation result homogeneous.
Specifically, for n kind distribution transforming, m evaluation index, available evaluations matrix R ', expression are as follows:
Making standardization to the element in evaluations matrix R ' matrix can obtain: R=(rij)m×n,
Wherein, when evaluation index is high excellent index, standardization formula is indicated are as follows:
When evaluation index is low excellent index, standardization formula is indicated are as follows:
Then rijFor the numerical value of j-th of index of i-th kind of distribution transforming, (i=1,2 ..., n；J=1,2 ..., m).
In the application, in six given indexs, failure rate and health condition are inversely proportional, and failure rate is low excellent index,
That is, failure rate is lower, distribution transforming health condition is better；Remaining five index is high excellent index.
The entropy of j-th of evaluation index is calculated, is indicated are as follows:In formula: k=ln (n),
The objective weight of the evaluation index of the distribution transformer is calculated, is indicated are as follows:Final
Objective weight to six indexs is as shown in table 6.
Table 6:
| Arrival probability of acceptance of spot check | Arrival full inspection qualification rate | Online rate | Acquire percentage of head rice | Failure rate | Repair rate |
| 0.163825 | 0.163825 | 0.189537 | 0.162035 | 0.159847 | 0.160932 |
That is: Wj,2=(0.163825,0.163825,0.189537,0.162035,0.159847,0.160932).
Step S103: according to the subjective weight and the objective weight, comprehensive weight is calculated；
In the application, according to the subjective weight Wj,1With the objective weight Wj,2, by " multiplication " Integration Method, calculate
To comprehensive weight Wj, calculation formula expression are as follows:By above-mentioned formula, the synthesis of index is calculated
Property weight.
Step S104: according to the comprehensive weight, calculating the evaluation index weighted sum, obtains distribution transformer health
State comprehensive score；
Step S105: distribution transformer is ranked up according to the distribution transformer health status comprehensive score.
According to the distribution transformer health evaluating target layers structural model, closed for arrival probability of acceptance of spot check, full inspection
Lattice rate, online rate, acquisition percentage of head rice, failure rate and repair rate this six achievement datas, provide each index score respectively, will
Each index score is multiplied by the comprehensive weight Wj, obtain score after each index calculating, then each index score is added, matched
Piezoelectric transformer health status comprehensive score, scores to each distribution transformer, by distribution transformer health score assigning from height to
It is low to be ranked up.
To sum up, in the distribution transformer health evaluating method in the application, distribution transforming health evaluating target layers structure is established
Model determines each index subjectivity weight, then pass through entropy based on the judgment matrix middle layer fractional analysis provided in the embodiment of the present invention
Power method calculates each index objective weight, and comprehensive power is calculated using " multiplication " Integration Method then in conjunction with master, objective weight
Weight, finally by asking distribution transforming health evaluating index weighted sum to obtain comprehensive score, is ranked up each distribution transformer.This Shen
Please in distribution transformer health evaluating method avoid only rely on analytic hierarchy process (AHP) weight setting excessively subjectivity cause assessment tie
The volatile genuine problem of fruit is realized more accurate distribution transformer health evaluating, is helped by calculating subjective weight and objective weight
Maintenance personnel is helped to grasp distribution transformer health status in time comprehensively, so that enterprise arranges distribution transformer maintenance work in time,
Distribution transformer failure is reduced to occur.
Since embodiment of above is that reference combination is illustrated on other modes, have between different embodiments
There is identical part, identical, similar part may refer to each other between each embodiment in this specification.Herein no longer in detail
It illustrates.
It should be noted that in the present specification, the relational terms of such as " first " and " second " or the like are used merely to
It distinguishes one entity or operation from another entity or operation, and not necessarily requires or imply these entities or operation
Between there are any this actual relationship or sequences.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the circuit structure, article or the equipment that include a series of elements not only include those
Element, but also including other elements that are not explicitly listed, or further include for this circuit structure, article or equipment
Intrinsic element.In the absence of more restrictions, the element for thering is sentence "including a ..." to limit, it is not excluded that
There is also other identical elements in circuit structure, article or equipment including the element.
Those skilled in the art will readily occur to its of the application after considering specification and practicing the disclosure invented here
His embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are wanted by right
The content asked is pointed out.
Above-described the application embodiment does not constitute the restriction to the application protection scope.
Claims (7)
1. a kind of distribution transformer health evaluating method, which is characterized in that the described method includes:
According to the evaluation index of distribution transformer, distribution transformer health evaluating target layers structural model, the assessment are constructed
Index includes: arrival probability of acceptance of spot check, full inspection qualification rate, online rate, acquisition percentage of head rice, failure rate and a repair rate；
Calculate the subjective weight and objective weight of the evaluation index；
According to the subjective weight and the objective weight, comprehensive weight is calculated；
According to the comprehensive weight, the evaluation index weighted sum is calculated, obtains distribution transformer health status comprehensive score；
Distribution transformer is ranked up according to the distribution transformer health status comprehensive score.
2. distribution transformer health evaluating method according to claim 1, which is characterized in that according to commenting for distribution transformer
Estimate index, construct distribution transformer health evaluating target layers structural model, comprising:
Distribution transforming health evaluating A is set as destination layer；
By distribution transforming quality inspection situation B1, distribution transforming operating condition B2, distribution transforming maintenance quality B3It is set as indicator layer；
By two quality inspection index C of the arrival probability of acceptance of spot check and full inspection qualification rate1j(j=1,2) the distribution transforming quality inspection feelings are set as
Condition B1Sub- indicator layer；By the online rate and acquisition two operating index C of percentage of head rice2j(j=1,2) it is set as the distribution transforming operation
Situation B2Sub- indicator layer；By two maintenance index C of the failure rate and a repair rate3j(j=1,2) it is set as the distribution transforming dimension
Protect quality B3Sub- indicator layer.
3. distribution transformer health evaluating method according to claim 1, which is characterized in that the calculating assessment refers to
Target subjectivity weight, comprising:
It is x according to the importance ranking that Scale-Extending obtains n index1≥x2≥...≥xn；
To xiWith xi+1It is compared, the corresponding scale value of the index is denoted as ti, wherein i 1-n；
According to the transitivity of the index significance level, judgment matrix R is obtained, the judgment matrix R is indicated are as follows:
Successively obtain mark layer B1jTo the judgment matrix of destination layer A, sub- indicator layer C1jTo indicator layer B1Judgment matrix, sub- indicator layer
C2jTo indicator layer B2Judgment matrix, sub- indicator layer C3jTo indicator layer B3Judgment matrix；
According to judgment matrix, the subjective weight W of the evaluation index of the distribution transformer is calculatedj,1。
4. distribution transformer health evaluating method according to claim 1, which is characterized in that the calculating assessment refers to
Target objective weight, comprising:
According to n kind distribution transformer and m evaluation index, evaluations matrix R ' is obtained, is indicated are as follows:
Element in the evaluations matrix R ' is standardized, R=(r is obtainedij)m×n, in formula, rijFor the jth of i-th kind of distribution transforming
The numerical value of a evaluation index, i 1-n, j 1-m；
The entropy of j-th of evaluation index is calculated, is indicated are as follows:
In formula: k=ln (n),
The objective weight of the evaluation index of the distribution transformer is calculated, is indicated are as follows:
5. distribution transformer health evaluating method according to claim 4, which is characterized in that will be in the evaluations matrix R '
Element be standardized, comprising:
When evaluation index is high excellent index, standardization formula is indicated are as follows:
When evaluation index is low excellent index, standardization formula is indicated are as follows:
6. distribution transformer health evaluating method according to claim 1, which is characterized in that according to the subjective weight and
The objective weight calculates comprehensive weight, comprising:
According to the subjective weight Wj,1With the objective weight Wj,2, comprehensive weight W is calculatedj, calculation formula is as follows:
7. distribution transformer health evaluating method according to claim 6, which is characterized in that according to the comprehensive power
Weight, calculates the evaluation index weighted sum, obtains distribution transformer health status comprehensive score, comprising:
According to the distribution transformer health evaluating target layers structural model, pass through the comprehensive weight WjWith the assessment
Index obtains distribution transformer health status comprehensive score.
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| CN111080072A (en) * | 2019-11-21 | 2020-04-28 | 广州供电局有限公司 | Distribution transformer health index evaluation method, device and system |
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