CN110334817A - A kind of relay protection maintainability distribution index system and appraisal procedure - Google Patents
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Abstract
This patent is related to a kind of relay protection maintainability distribution index system and appraisal procedure comprising following steps: step 1 divides relay protection maintainability distribution index system；Step 2 chooses the bottom index for having the evaluation index for representing meaning as calculating, assigns power by its importance for these bottom indexs, the point value of evaluation under calculating relay protection maintainability dimension；Point value of evaluation etc. under step 3, calculating bottom Index Weights value, maintainability dimension.This patent proposes a set of comprehensive maintainability distribution index system; bottom index importance different problems are considered simultaneously; and the method for improved entropy method and G1 method combination weights has been used on this basis; therefore the result obtained is more credible; and this roadmap has flexibility, the assessment suitable for each stages such as relay protection maintenance, management, research and development.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System field more particularly to a kind of relay protection maintainability distribution indexs
System and appraisal procedure.
Background technique
The first line of defence of the protective relaying device as the generation for ensureing electric power netting safe running, the sexual behavior that is against any misfortune event,
Action message is closely bound up with power network safety operation.The normal work for ensuring protective relaying device is to ensure that power grid security is steady
Surely one of important content run.When the grid collapses, if protective relaying device cannot be acted correctly, electricity can not only be made
The failure propagation of Force system, in some instances it may even be possible to cause entire mains breakdown because of undesirable chain reaction, lead to large-area power-cuts, give
Normal life, economic development and the social stability of people, which is brought, to be seriously affected.Protective device maintainability refers to product in defined item
Under part and in the defined time, when repairing by regulated procedure and method, the ability of specified states is kept or is restored to.North
The U.S. electric reliability committee (NERC) carries out statistical research, the electric system thing of 63% or more discovery to 17 years casualty datas
Therefore it is related with relay protection incorrect operation.According in previous crash analysis, some trans-regional large-scale blackouts mostly because after
The maloperation of electric protection staff and the malfunction of automatic safety device or tripping.
For the protective relaying device run on site, maintenance and replacement are maintenances, improve having for device normal operation
Effect measure.The maintenance currently, troubleshooting system mainly acts out one's plan, generally takes the form of periodic inspection.Overhaul project, engineering peace
Row and time between overhauls(TBO), equipment operation was opened once reaching fixed date by administrative department according to corresponding regulation or empirically determined
Begin to overhaul.This maintenance mode can cause excess to be overhauled, increase accidentally touch, mis-wired, tuning error probability, be unfavorable for improve enterprise
The economic benefit of industry, and relay protection troubleshooting system lacks scientific, the foundation and method of shortage formulation Strategies of Maintenance.Currently
Relay protection maintenance Journal of Sex Research in be not yet related to delay time at stop in maintenance process, verify time, maintenance cost, maintenance man-hours
Deng clearly dividing, not yet relay protection maintainability distribution index is furtherd investigate.Therefore, it is necessary to propose a kind of relay
Maintainability distribution index system is protected, and carries out the research of appraisal procedure based on this index system.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of relay protection maintainability distribution index system and assessment sides
Method.
To achieve the above object, the present invention takes following technical scheme: a kind of relay protection maintainability distribution index system
And appraisal procedure, comprising the following steps:
Step 1: dividing relay protection maintainability distribution index system.
Step 2: proposing relay protection maintainability distribution method, according to engineering reality, this method, which is chosen to have, represents meaning
The evaluation index of justice assigns power by its importance as the bottom index calculated, and for these bottom indexs, and last join protection is real
The reference value etc. provided in border operation data, the historical data in analysis and assessment report and pertinent literature calculates relay protection maintenance
Point value of evaluation under property dimension.
To the division of relay protection maintainability distribution index system in the step 1；
Maintainability refers to that product under the defined conditions and in the defined time, is repaired by regulated procedure and method
When, keep or be restored to the ability of specified states.Signified relay protection Maintainability index of the invention will be to existing maintenance and dimension
It repairs index in scope to be screened, on the basis of summarizing index meaning, be divided under this dimension of maintainability, keep it true
Just there is relative independentability, narrow sense, assessment can be made in this maintainability dimension.According to practical index distribution situation, after
Electric protection Maintainability index includes 5 class two-level index: basic index, index relevant to maintenance time and maintenance mans' phase
The index of pass, index relevant to maintenance cost, O&M overhaul index；
Basic index includes repairing the basic indexs such as density, repair rate, and no matter this kind of index is in mathematics or physics
In meaning, there is its fundamental property；
Index relevant to maintenance time includes mean repair time, preventive maintenance time, the failure improvement time, verifies
The indexs such as time, such index feature are the units for being all the time, reflect and overhaul links institute in this scope in maintenance
The time of cost, the meaning for counting this kind of index are cost of the only fine division for time links, find
More efficient arrangement of time improves working efficiency, loses caused by reducing because of maintenance maintenance.
Index relevant to maintenance man-hours include maintenance man-hours, average corrective maintenance working hour, each repair dimension
It repairs working hour etc., this kind of index embodies in maintainability scope from the angle in working hour repairs service work cost working hour to protection
Situation has its significance in actual field.
Index relevant to maintenance cost includes every direct maintenance cost using hour, maintenance package expense, maintenance personal's work
Rate, the average annual maintenance expense of protection etc., such index protrudes the expense occurred when maintenance, carries out to the expense of maintenance maintenance link
Statistics, out of the angle of expense embodiment maintainability scope the case where every expense.
O&M maintenance index includes optimal repair cycle, protection remaining runtime, the best active time of protective device, labour
Age back-off factor, regular inspection completion rate of the plan etc., such index summarize the index in maintainability scope from the angle that O&M overhauls, from
The calculating of optimal repair cycle, determination or even service age reduction factor to best active time and remaining runtime etc. other
The determination of health factor all has important directive significance to the adjustment of the formulation of maintenance plan, operation and maintenance mode.
The definition of part Maintainability index and calculation method are as follows:
(1) crash rate: component is under from initial time to moment t intact condition, is failed after the moment t in the time
Probability.The malfunction and failure of relay protection can be divided into tripping failure and malfunction two classes of failure.L (t) dt indicates component from when starting
Carve it is intact to t moment, (t, t+dt] between the probability that fails.Crash rate are as follows:
(2) protective relaying device accumulated invalid probability F (t): the probability that i.e. protective relaying device fails in t moment,
It may be expressed as:
When failure rate estimation is constant, failure rate estimation may be simply referred to as crash rate, at this point, Reliability Function can be reduced to it is as follows
Exponential function, RG)=P (X > t)=exp (- λ t).
(3) relay fail crash rate and false protection crash rate: protection location unfailing service to time t and
The conditional probability probability of tripping failure and malfunction failure occurs after t in infinitesimal time Δ t.
Wherein, TjAnd TwTripping failure occurs for protection and the time of malfunction failure occurs.
The total crash rate of protection system indicates are as follows:
λp=λpj+λpw (5)
(4) performance factor P is protectedraWith protection incorrect operation rate Pnra:
In formula, nrFor correct action frequency in similar protection certain time；naFor movement total in similar protection certain time
Number；njFor tripping number in similar protection certain time；nwFor malfunction number in similar protection certain time；
(5) relay fail frequency and false protection frequency: indicate protection system occurs within the unit time tripping number with
The expectation of malfunction number.
In formula, TMTTJiAnd TMTJRiThe time of tripping and malfunction occurs for protection；TMTTWiAnd TMTWRiAfter tripping and malfunction
The time of reparation；njFor tripping number in similar protection certain time；nwFor malfunction number in similar protection certain time；
(6) protection philosophy tripping probability:
PJ(i)=P "J(i)P″J(i)P″J(i) (10)
Wherein P 'J(i), P "J(i), P "J(i) it is respectively each section of three section protection of operation tripping probability.
(7) protection philosophy malfunction probability:
PW(i)=P 'W(i, Δ i) P "W(i, Δ i) P "W(i, Δ i) (11)
Wherein P "W(i, Δ i) P "W(i, Δ i) P "W(i, Δ i) are each section of operation malfunction probability, are adjacent next section of routes
The probability of non-selective movement is protected when breaking down.
(8) protection philosophy tripping crash rate index:
Wherein t is current time, t0For the last principle tripping moment, if being taken as protection without statistic record and throwing
Transport the moment.
(9) protection philosophy malfunction crash rate index:
Wherein t is current time, t0For the last principle malfunction moment, if being taken as protection without statistic record and throwing
Transport the moment.
(10) overhaul time (TTFO) for the first time: under the defined conditions, protect the service life from beginning to use overhaul for the first time single
Digit.
(11) time before spoilage malfunction occurs: before spoilage malfunction occurs, the total time of protection element work.
(12) fault clearing time: when the failure that must be cut off occurs, the temporal summation of protective device and breaker actuation.
General quick operating time of protection is in 0.06-0.12s, most fast reachable 0.01-0.04s.The actuation time of general breaker
It is 0.06-0.15s, most fast reachable 0.02-0.06s.
(13) quick-action rate: when breaking down, relay protection excision failure time meet the stipulated time requirement number and
The ratio between the total degree of relay protection movement excision failure.
(14) fault-free malfunction rate λnf:
(15) protection philosophy malfunction crash rate index:
(16) tripping rate λr:
(17) malfunction rate λmn:
(18) operational failure rate λ0:
λ0=λmn+λr (18)
19) comprehensive crash rate λ∑:
(20) troubles inside the sample space performance factor εico:
(21) external area error performance factor εoco:
Wherein: nmofFor the failure number accumulation found when periodic maintenance, T0For runing time accumulation, TmofWhen for periodic maintenance
Between accumulate, TmnsrStop not accumulated time, n for failureicoFor the correct action frequency of troubles inside the sample space, nocoIt is failure to actuate for external area error secondary
Number；
(22) operational failure rate λ0:
εco=εico+εoco (22)
(23) comprehensive crash rate λ∑:
(24) back-up protection tripping hidden danger probability: for there is the relay protection system of back-up protection, in order to assess it in quilt
It is also difficult to the hidden danger state showed in the case of protection equipment fault, defines back-up protection tripping hidden danger probability Jby.It is assumed that protecting
Protected device failure in protecting system state space and state that back-up protection does not show tripping hidden danger has j, system exists
The probability of stability of state i is the tripping hidden danger probability J of computing systembyAre as follows:
(25) reclosing performance factor: reclosing correctly acts the ratio between action frequency and total action frequency.
(26) misuse failure rate: element accounts for the total Failure count of element beyond failure number caused by allowed band using middle load
Ratio.
(27) gradual failure rate: it is total that the failure number that the passage of performance as defined in element at any time gradually changes generation accounts for element
The ratio of Failure count.This failure possibly through in advance inspection or monitoring predict, there may come a time when through preventative dimension
It repairs and is avoided.
(28) catastrophic failure rate: the failure number that inspection or monitoring in advance cannot predict accounts for the ratio of the total Failure count of element
Example.Primary crash rate: be not by the failure of another element or failure directly or indirectly caused by element or system failure
Number accounts for the ratio of element or the total Failure count of system.
(29) dependent failure rate: by the failure of another element or failure directly or indirectly caused by element or system
Failure number accounts for the ratio of element or the total Failure count of system.
(30) partial failure rate: element or system can complete certain predetermined functions, but cannot complete whole predetermined functions
Failure number account for the ratio of the total Failure count of element.
Relay protection maintainability distribution Index system framework is as shown in Figure 1.
In the step 2, relay protection maintainability distribution method is proposed, according to engineering reality, the selection of this method has
It represents the evaluation index of meaning and assigns power by its importance as the bottom index calculated, and for these bottom indexs, finally combine
The reference value etc. provided in protection actual operating data, the historical data in analysis and assessment report and pertinent literature calculates relay and protects
Protect the point value of evaluation under maintainability dimension.
It is practical according to current engineering, the present invention is quasi- choose mean repair time, repair rate, average corrective maintenance working hour,
Optimal Preventive time between overhaul, the average annual cost of overhaul of protection are used as the typical bottom in maintainability distribution index system and refer to
Mark.The present invention is quasi- to select more objective improved entropy method and the stronger G1 method of subjectivity, and combines the result that the two calculates and obtain
Comprehensive weight keeps tax power calculated result more credible and accurate.Present invention combination somewhere operation of power networks real data, assessment point
The reference value provided in historical data and pertinent literature in analysis report, carries out in relay protection maintainability distribution index system
Point value of evaluation under relay protection maintainability dimension calculates.It is entitled based on step 2 as a result, according to a batch of currently practical power grid
Operation data determines the measured value of typical case's bottom index, searches the standard that coherent reference data determines the above typical bottom index
Value converts score value for the measured value of current this batch of index by the comparison with standard value, entitled in conjunction with typical index
As a result the index value under final relay protection maintainability distribution dimension is calculated.
Assessment calculating is carried out in relay protection maintainability distribution index system.Detailed process is as shown in Figure 2.
This patent obtains assessment result, the technical side that the present invention uses based on the relay protection Maintainability index system of proposition
What case had the advantage that 1, the invention proposes the index of correlation of relay protection field maintainability, proposes a set of
Comprehensive maintainability distribution index system can research and develop people by establishing for this system for the maintenance management of protective relaying device
Member provides the operating analysis thinking protected in maintainability dimension.2, it is safeguarded, managed, ground as locating for the basis for selecting of bottom index
The stages such as hair can embody difference, and the present invention considers bottom index importance different problems, and uses on this basis
The method of improved entropy method and G1 method combination weights, therefore obtained result is more credible, and this roadmap has spirit
Activity, the assessment suitable for each stages such as relay protection maintenance, management, research and development.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is that a kind of relay protection maintainability distribution index system and appraisal procedure process provided in an embodiment of the present invention are shown
It is intended to；
The relay protection Maintainability index System Framework that Fig. 2 is enumerated by the embodiment of the present invention；
Fig. 3 is the relay protection maintainability various dimensions estimation flow figure of the embodiment of the present invention.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
A kind of protective relaying device evaluation index system provided by the invention, comprising the following steps:
Step 1: dividing relay protection maintainability distribution index system.
The present invention to the division of relay protection maintainability distribution index system as shown in Figure 1:
It is practical according to current engineering, the present invention is quasi- choose mean repair time, repair rate, average corrective maintenance working hour,
Optimal Preventive time between overhaul, average annual maintenance this 5 indexs of expense of protection are as the allusion quotation in maintainability distribution index system
Type bottom index.
Step 2: selecting improved entropy method and G1 method, and combine the result that the two calculates and obtain comprehensive weight.
The calculating hypothesis evaluation index set of improved entropy method shares m factor, and n expert is allowed to carry out tax power to each factor
Weight, then, obtain weight matrix F:
rijJ-th of expert is indicated to the tax weight of i-th of index, wherein i=1,2 ... m, j=1,2 ... n are first to each
The weight of column carries out that entropy operation is asked to be known as column entropy, that is, the entropy for the weight for asking certain expert to assign m index, andThe formula of column entropy are as follows:
HjWhat is indicated is the entropy for the weight that j-th of expert assigns m index.As bigger this expert of expression of column entropy
It is small to provide value of utility brought by weight, should give up.We need to set a threshold value thus, give up the expert greater than this threshold value
Weight is assigned, we cast out that maximum value of column entropy according to expertise.Assuming that having given up expert's imparting greater than threshold value
Weight, there are also the weights that q expert assigns.Weight matrix F ' is rebuild accordingly:
Seek the entropy of every a line of this matrix again, that is, q expert be to the entropy of the entitled weight of some index,
Referred to as row entropy.It seeks that first the weight of every a line of F ' is normalized before row entropy:
So thatWherein i=1,2 ... m, j=1,2 ... q.Available row entropy H accordinglyi:
Work as HiBigger to illustrate that q expert has no objection to the tax weight of i-th of index, recognition rate is high, and accuracy is higher, table
Show i-th of index not and will lead to that large error occurs in evaluation result, it is on the contrary then keep evaluation result error big, so HiBigger expression
The importance of index i is bigger.Seek the standard deviation of the i-th row:
WhereinIf σiValue it is bigger represent these experts for the same index disagreement compared with
Greatly, then the weight of the index may be inaccurate, therefore should reduce the weight of the index.According to standard deviation sigmaiWith row entropy Hi, obtain final
Index weight value answer are as follows:
Wherein uiIt is mean value of the q expert of index to index i.
The calculating of G1 method allows expert according to protective relaying device assessment level to index factor collection { x1, x2... xmAccording to weight
The property wanted sorts, and allows expert in index set { x first1, x2... xmSelect and be considered that a most important index is denoted as x1 *, it is further continued for
In remaining m-1 index, selects and be considered that a most important index is denoted as x2 *, and so on, by m-1 times choose
Choosing, final remaining evaluation index are denoted asThus uniquely determine an order relation:
If expert is about evaluation indexWithThe ratio between importance degreeRational judgment it is as shown in table 1:
Table 1Assignment reference table
Wherein:
What if expert providedRationality assignment, then index weightsAre as follows:
By above-mentioned (33), (34) are available finalValue.
The weight that obtains of Improved entropy is wiWeight v is obtained with G1 methodi(i=k=m, m-1 ... 3,2) combines two kinds
Weight obtains comprehensive weight using following formula:
Wherein AiIt is exactly the weight of index i after two kinds of weights combine,After combined weight, when certain
When the measured value of a index exceeds normal range (NR), combining weights can not accurate response to go out it important in evaluation system
Property, variable weight need to be carried out to it and obtain suitable weight.When measured value is more than the formula of the upper limit so variable weight of normal range (NR) are as follows:
When lower limit then variable weight formula of the measured value lower than normal range (NR) are as follows:
Wherein A 'i(i=1,2 ... m) be index i variable weight, uminAnd umaxRefer respectively to the minimum value and maximum of mark i
Value uiIt is actual measured value.Variable weight will finally be obtained and combining weights are normalized and can be obtained by final each index
Weight:
Or:
(38) are used when index i is abnormal index, use (39) when i is normal index.A represents comprehensive weight
Index and, A ' represents the sum of variable weight of abnormal index.It allows expert rule of thumb and combines and obtain the actual measurement number of each index
Certain score value is given according to this m index, the full marks of each index are 100, then combining the point value of evaluation of each index
The weight of the index, and they are added and obtains the scoring in assessed dimension:
P=T1s1+T2s2+…+Tmsm (40)
P is the score value in institute's dimensions, si(u=1,2 ... m) be expert to index i point value of evaluation.
Step 3: the relay protection maintainability distribution index system based on foundation protects operation number with somewhere actual electric network
According to for foundation, assessed value is calculated.
The quasi- example for choosing A, B area power grid protective relaying device analytical calculation as a comparison, to relay protection of the present invention
Evaluation index system is described in further detail.The protection of selection is on active service with batch, is applied to 220kV system, is selected different factories
Family.Various dimensions analysis and assessment calculating will be carried out based on A area power grid protection data below, and can similarly obtain the protection of B area power grid
Analyze result.It is specific:
(1) A area power grid protection maintainability dimension index evaluation analysis
Based on relay protection maintainability distribution index system, A area power grid protects dimension in maintainability dimension index evaluation
The typical bottom index of lower selection, according to related data determine standard value range, the measured value of protection it is as shown in table 2:
2 relay protection Maintainability index parameter list of table
Step1 improved entropy method calculates weight:
According to reference data shown in table 1, it is as shown in table 3 to obtain index score value:
3 maintainability bottom index score value of table
Obtaining index number m is 5, and expert n is 5, weight matrix F are as follows:
Give up maximum, to reconfigure weight matrix F ' after obtaining the column entropy of 5 experts by formula (27):
As row entropy HiBigger to illustrate that q expert has no objection to the tax weight of i-th of index, recognition rate is high, accuracy compared with
Height indicates that i-th of index not will lead to evaluation result and large error occur, on the contrary then keep evaluation result error big, so HiMore
The big importance for indicating index i is bigger.
By formula (29), (30), (31) can obtain row entropy Hi, standard deviation sigmai, mean value ui, index weights wiIt is as shown in table 4:
4 improved entropy method Maintainability index calculation result table of table
Step2G1 method calculates weight:
This known 5 index { x1=mean repair time, x2=repair rate, x3=be averaged corrective maintenance working hour, x4=
Optimal Preventive time between overhaul, x5The average annual maintenance expense of=protection }；
Expert is allowed rule of thumb to list this 5 indexs: { x from big to small in sequence4≥x1≥x2≥x5≥x3}；
Again it indicates are as follows:
SoValue can allow expert according to table 1 carry out rational judgment:
What if expert providedRationality assignment, then index weightsAre as follows:
The weighted value of 5 G1 method parameter of table
Step3 comprehensive weight calculates:
The weight that obtains of Improved entropy is wiWeight v is obtained with G1 methodk(i=k=m, m-1 ... 3,2) combines two kinds
Weight obtains comprehensive weight using formula (4-11): comprehensive weight can be obtained:
A1=0.2618, A2=0.1712, A3=0.1334, A4=0.2182, A5=0.2154；
The scoring of Step4 maintainability dimension calculates:
It allows expert rule of thumb and the measured data for obtaining each index is combined to give certain score value to this m index, often
The full marks of a index are 100, then the point value of evaluation of each index is made to combine the weight of the index, and they are added
To the scoring of final maintainability dimension:
P=T1s1+T2s2+…+Tmsm
P is the scoring of maintainability dimension, si(i=1,2 ... m) be expert to index i point value of evaluation.Calculate last comment
The score value P=81.2742 estimated；
(2) B electric network protection maintainability dimension analysis and assessment result can similarly be obtained:
6 B electric network protection maintainability bottom index score value of table
Calculate the score value P=85.4405 of last assessment；
Above-described embodiment is merely preferred embodiments of the present invention, but protection scope of the present invention is not limited to
This, all equivalents and improvement carried out based on the technical solution of the present invention should not be excluded in protection of the invention
Except range.
Claims (5)
1. a kind of relay protection maintainability distribution index system and appraisal procedure, comprising the following steps:
Step 1 divides relay protection maintainability distribution index system, it is considered herein that relay protection Maintainability index includes 5 classes
Two-level index: basic index, index relevant to maintenance time, index relevant with maintenance man-hours, related with maintenance cost
Index, O&M overhaul index；
Step 2 proposes relay protection maintainability distribution method, and according to engineering reality, this method, which is chosen to have, represents meaning
Evaluation index assigns power, the practical fortune of last join protection by its importance as the bottom index calculated, and for these bottom indexs
The reference value etc. provided in row data, the historical data in analysis and assessment report and pertinent literature calculates relay protection maintainability dimension
Point value of evaluation under degree.
2. a kind of relay protection maintainability distribution index system according to claim 1 and appraisal procedure, it is characterised in that:
Relay protection Maintainability index system is divided in the step 1, the maintainability of relay protection system refers to product in defined item
Under part and in the defined time, when repairing by regulated procedure and method, the ability of specified states is kept or is restored to.
3. it is considered herein that relay protection Maintainability index should cover 5 class two-level index: basic index, with maintenance time phase
The index of pass, index relevant to maintenance man-hours, index relevant with maintenance cost, O&M overhaul index, specific targets frame
As shown in Figure 2.
4. a kind of relay protection maintainability distribution index system according to claim 1 and appraisal procedure, it is characterised in that:
According to engineering reality in the step 2, choosing has the evaluation index for representing meaning as the bottom index calculated, and is these
Bottom index assigns power, historical data and phase in last join protection actual operating data, analysis and assessment report by its importance
Point value of evaluation under the calculating relay protection maintainability dimension such as reference value provided in document is provided.
5. proposing the maintainability distribution method established in relay protection maintainability distribution index system；Detailed process such as Fig. 3 institute
Show；It is characterized by: being chosen first in relay protection maintainability dimension according to actual requirement, there is the bottom of typical meaning to refer to
Mark, the present invention is quasi- choose mean repair time, repair rate, average corrective maintenance working hour, Optimal Preventive time between overhaul,
The average annual cost of overhaul is protected to be used as the typical bottom index in maintainability distribution index system；The selection of this bottom index with
In different phases such as maintenance, research and development, operations, the bottom index of selection is not also identical for protection, has stronger flexibility and work
Cheng Shiyong prospect；Secondly tax power is carried out by its different degree for these indexs, the present invention selects more objective improved entropy method and master
The stronger G1 method of the property seen, and combine the result that the two calculates and obtain comprehensive weight, keep tax power calculated result more credible and accurate；
The batch of data finally run according to currently practical electric network protection determines the measured value of typical case's bottom index, searches coherent reference
Data determines the standard value of typical bottom index, by the comparison with standard value, converts the measured value of current this batch of index to
Score value calculates the index value under final relay protection maintainability dimension in conjunction with the entitled result of typical index.
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