CN107239896A - A kind of security of relay protection appraisal procedure - Google Patents
A kind of security of relay protection appraisal procedure Download PDFInfo
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Abstract
The invention discloses a kind of security of relay protection appraisal procedure, security of relay protection evaluation index system is divided first；The evaluation index system includes 3 class two-level index：Safety indexes, protection definite value security margin index and the protection device safety indexes of meter and shielding failure；According to engineering actual demand, choose specific evaluation index and be used as bottom index；For selected bottom index tax power is carried out by importance；According to the service data of currently practical power network, the measured value of bottom index is determined；Search in pertinent literature the reference value that provides to determine the standard value of the bottom index, the measured value and standard value are contrasted, the measured value of bottom index is converted into score value；The point value of evaluation that obtains under security of relay protection dimension is calculated with reference to the tax power result of score value and bottom index.The above method can provide the operating analysis thinking of protection in security dimension for the maintenance management research staff of protective relaying device, and assessment result is more credible.
Description
Technical field
The present invention relates to technical field of power systems, more particularly to a kind of security of relay protection appraisal procedure.
Background technology
The characteristics of current China power network has grid structure and the alternating current-direct current series-parallel connection of complicated interconnection, the power network of super interconnection is given
While people bring huge interests, operation, maintenance also to power network bring huge challenge.Relay protection is power system peace
The first line of defence of full safety, relay protection can normal work, have great influence to Operation of Electric Systems.In Large-Scale Interconnected
In power network, Local Accidents may trigger the large-area power-cuts of whole system, and with the expansion of power system scale, accident hair
Raw probability can also increase.
Relay protection is to prevent fault spread or the important guarantee of chain reaction, and protective relaying device is used as power system
The first line of defence, its importance can not be ignored, and how the objective comprehensive running status for evaluating protective relaying device is safe electricity
One very important content of net safe and stable operation.The security of relay protection system refers to the design characteristics of protection system
The ability of protection use requirement can be met with the secure resources of plan, prior art is not yet to security of relay protection index system
Further investigation was carried out, and the content of security of relay protection index seems increasingly with the upgrading development of current protection device
It is important, just can not be comprehensive if science does not divide security of relay protection index system and further studied on this basis
And accurately evaluate relay protection.
The content of the invention
It is an object of the invention to provide a kind of security of relay protection appraisal procedure, this method can be protective relaying device
Maintenance management research staff the operating analysis thinking of protection in security dimension is provided, assessment result is more credible.
A kind of security of relay protection appraisal procedure, methods described includes：
Step 1, division security of relay protection evaluation index system；The evaluation index system includes 3 class two-level index：
Safety indexes, protection definite value security margin index and the protection device safety indexes of meter and shielding failure；
Step 2, according to engineering actual demand, choose specific evaluation index and be used as bottom index；
Step 3, for selected bottom index by importance carry out tax power；
Step 4, the service data according to currently practical power network, determine the measured value of bottom index；
Step 5, search in pertinent literature the reference value that provides to determine the standard value of the bottom index, by the actual measurement
Value and the standard value are contrasted, and the measured value of bottom index is converted into score value；
Step 6, the tax power result with reference to score value and bottom index calculate and obtain commenting under security of relay protection dimension
Estimate score value.
The safety indexes of the meter and shielding failure include system load-loss probability, system and lose LOAD FREQUENCY, averagely cut
After load duration, load excision desired value, expected loss of load, system severity, failure probability and failure
Really；
The protection definite value security margin index includes sensitivity coefficient, selective determination value and safety factor；
The protection device safety indexes include protection device ATTRIBUTE INDEX, internal software and hardware index, operating index and
Confounding factor index.
The protection device ATTRIBUTE INDEX further comprises there is batch equipment degree of unavailability, manufacturing firm's equipment degree of unavailability
With particular device model degree of unavailability；
The internal software and hardware index further comprises thering is supply voltage offset, power source temperature offset, branch current
Offset, each branch insulation data offset and optical module light intensity offset；
The operating index further comprises thering is CPU usage offset, external temperature offset, outer moisture offset
Initial data difference offset during with putting into operation；
The confounding factor index further comprises thering is TA secondary loop currents offset, TA contact resistances offset, TA
The poor offset of temperature offset amount, TV three-phase currents and TV residual voltage offsets.
In the step 2, selected specific evaluation index includes：Failure probability, failure consequence, electric power deficiency are expected
Value, sensitivity coefficient and batch equipment degree of unavailability.
It is specific to calculate the weight of the bottom index using improved entropy method and G1 methods in the step 3, and combine two
The result that person calculates obtains comprehensive weight, is that selected bottom index carries out tax power by importance.
The bottom index weights that the utilization improved entropy method is obtained are expressed as：
Wherein, σiFor standard deviation, HiFor row entropy, uiFor scoring average of the expert to bottom index i, bottom index i=1,
2 ... m, m are the bottom index number chosen；
The bottom index weights obtained using G1 methods are expressed as：
Wherein, weight is vi, i=k=m, m-1 ... 3,2；
Comprehensive weight is obtained with reference to the result that both calculate to be expressed as：
Wherein, AiIt is exactly the weight of bottom index i after two kinds of weights are combined, and
In the step 6, the point value of evaluation calculation formula under the security of relay protection dimension is：
P=T1s1+T2s2+…+Tmsm；
Wherein, siIt is score value of the expert to bottom index i, Ti weighs result for bottom index i tax；
And i=1,2 ... m.
As seen from the above technical solution provided by the invention, the above method can be the maintenance pipe of protective relaying device
The operating analysis thinking that research staff provides protection in security dimension is managed, assessment result is more credible, and this processing is thought
Road has flexibility, it is adaptable to the assessment in each stage such as relay protection is safeguarded, management, research and development.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, being used required in being described below to embodiment
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
The security of relay protection appraisal procedure schematic flow sheet that Fig. 1 is provided by the embodiment of the present invention；
Fig. 2 provides security of relay protection evaluation index system schematic diagram by the embodiment of the present invention；
The reliability interface schematic diagram that Fig. 3 is enumerated by the embodiment of the present invention；
The tripping operation interface schematic diagram of bypassing the immediate leadership that Fig. 4 is enumerated by the embodiment of the present invention；
The relay fail interface schematic diagram that Fig. 5 is enumerated by the embodiment of the present invention.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
The embodiment of invention, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to protection scope of the present invention.
The embodiment of the present invention is described in further detail below in conjunction with accompanying drawing, is as shown in Figure 1 present invention implementation
The security of relay protection appraisal procedure schematic flow sheet that example is provided, methods described includes：
Step 1, division security of relay protection evaluation index system；
In this step, security refers to that relay protection system keeps not causing (dominant or recessiveness) device damage, property
Loss even endangers health and the ability of environment, and security of relay protection evaluation index will enter to the existing index about security
Row is screened, and is divided under security dimension, the evaluation index system divided in this example mainly refers to including two grades of 3 class
Mark：Safety indexes, protection definite value security margin index and the protection device safety indexes of meter and shielding failure, such as Fig. 2 institutes
It is shown as the embodiment of the present invention and security of relay protection evaluation index system schematic diagram is provided, wherein：
It is described meter and shielding failure safety indexes further comprise system load-loss probability, system lose LOAD FREQUENCY,
The average cutting load duration, load excision desired value, expected loss of load, system severity, failure probability and
Failure consequence；Such index thinks that malfunction and misaction seldom occurs in protective relaying device, but once occurs, it is possible to cause serious
Consequence, therefore from risk angle examine closely protective relaying device security.
The protection definite value security margin index includes sensitivity coefficient, selective determination value and safety factor；The protection is determined
The online check content of value security margin index concern includes：Using circuit, transformer and bus as object, to its main protection, after
The sensitivity of standby protection definite value and selectivity are checked.Wherein main protection definite value is checked and mainly had：Bus differential protection definite value is sensitive
Property check, the check of longitudinal differential protection system (vertical connection current differential, vertical connection distance, pilot direction) definite value sensitivity, transformer
The check of differential protection definite value sensitivity；Back-up protection definite value, which is checked, mainly to be had：The sensitivity of distance protection and selectively check,
III of Distance section definite value hide load-bearing capacity check online, the electric current of failure protection and press off again lock value sensitivity check, zero sequence
The sensitivity and selectivity of current protection are checked (containing directional element), the sensitivity of transformer overcurrent protection and selectivity are checked.
The characteristics of such index is calculated is to calculate to obtain protecting definite value margin of safety by the statistics to base values such as sensitivity coefficients, this
The evaluation of one nargin performance needs to complete in the point value of evaluation table of foundation, and the meaning of this kind of index is to definite value nargin category
The calculating of interior base values, is that place mat is made in next step progress total evaluation analysis.
The protection device safety indexes include protection device ATTRIBUTE INDEX, internal software and hardware index, operating index and
Confounding factor index；Such index, which is relied on, can describe the accurate data of equipment state, and part of appliance is under load and environmental condition
The situations such as the abrasion of generation, burn into stress, fatigue and aging, finally failure causes device damage and out of service.These are damaged
Gradually develop, they have certain rule, under different conditions, have plenty of the change of physical quantity, have plenty of chemical quantity
Change, have plenty of the change of electric parameter, in addition, also duration of runs of equipment, start-stop time, the changing of load, out-of-limit
Data and time, environmental condition etc..Protection device safety indexes enter in terms of historical statistical data and online data arrange two
Hand, mainly includes protection device attribute factor, internal hardware factor, operation factor, confounding factor etc., is counted by historical data
Analysis and the collection of online data are recognized, the state of protective relaying device can be estimated, and the meaning of state estimation is to know
The early stage sign of other failure, to trouble location, itself and the order of severity, fault progression trend are judged, and according to analyzing and diagnosing knot
Really, equipment performance decline to a certain extent or failure will occur before actively implement maintenance foundation be provided, it is electrically sets
Standby safe and stable, long period, full performance, high-quality operation are ensured there is provided reliable technology and management.
Further, in above-mentioned protection device safety indexes：
Protection device ATTRIBUTE INDEX further comprises there is batch equipment degree of unavailability, manufacturing firm's equipment degree of unavailability and spy
Locking equipment model degree of unavailability；Internal software and hardware index further comprises thering is supply voltage offset, power source temperature offset, branch
Road current offset amount, each branch insulation data offset and optical module light intensity offset；Operating index further comprises having CPU to make
With rate offset, external temperature offset, outer moisture offset and initial data difference offset during with putting into operation；Confounding factor
Index further comprises thering is TA secondary loop currents offset, TA contact resistances offset, TA temperature offset amounts, TV three-phase currents
Poor offset and TV residual voltage offsets.
The definition and computational methods to above-mentioned part index number are described as follows below：
(1) system load-loss probability (LOLP)：
(2) system lose LOAD FREQUENCY (LOLF) it is secondary/a：
(3) average cutting load duration (ADLL) h/ times：
(4) expected loss of load (EENS)：
Wherein, S is the set that system has cutting load state；tiIt is system mode i duration, CiFor system mode i's
Cutting load amount, NiTo there is the status number of cutting load, T is total simulation time, and unit is year.
(5) sensitivity coefficient：Sensitivity refers to protection device to the anti-of its protection domain internal fault or abnormal working position
Should be able to power, the comparison of the action setting valve of actual parameter and protection device when typically by being broken down by protection equipment come
It is determined that.For different protection types, after it breaks down, the Parameters variation of correspondence failure reflection is different, is divided into excessive protection
Or amount protection is owed, the expression formula of its sensitivity coefficient is also differed.
After breaking down, the protection device (excessive protection) that parameter rises, its sensitivity coefficient is：
After breaking down, the protection device (owing amount protection) that parameter declines, its sensitivity coefficient is：
By taking high-tension line zero-sequence current protection as an example, the calculation formula that route protection sensitivity is checked is：
Wherein, KlmFor sensitivity coefficient, IdzFor protection act definite value, IcurrDifferent type occurs for line end where protection
The maximum zero sequence current of protection is flowed through during earth fault.When the sensitivity coefficient calculated is unsatisfactory for the previously given requirement of user
When, then it can determine whether to be unsatisfactory for for sensitivity check.
(6) safety factor：
Here, definite value I1dz=Kk*IB, IBFor the offline last short circuit current flow of big mode, safety factor KkLower limit is have to be larger than, with
Ensure that subordinate's line fault protection is reliably failure to actuate, be illustrated in figure 3 the reliability interface signal that the embodiment of the present invention is enumerated
Figure：
As the offline last short circuit current flow I of certain modeB’>IB, definite value I1dzKeep constant, then its safety factor is expressed as：
Kk'=I1dz/IB' ＜ Kk (8)
Safety factor is caused to be less than setting, protection domain expands, and easily produces trip phenomenon of bypassing the immediate leadership, is illustrated in figure 4
Tripping operation interface schematic diagram that what the embodiment of the present invention was enumerated bypass the immediate leadership：
As the offline last short circuit current flow I of certain modeB”>IB, definite value I1dzKeep constant, then its safety factor is expressed as：
Kk"=I1dz/IB" ＞ Kk (9)
Cause safety factor to be more than setting, protection domain reduces, or even protection domain is zero, produce relay fail and show
As being illustrated in figure 5 the relay fail interface schematic diagram that the embodiment of the present invention is enumerated：
, can if I sections are protected definite value not produce change therewith because power system mode in actual motion is changed greatly
It can cause false protection, misaction.
(7) batch equipment degree of unavailability：Its degree of unavailability of the protective relaying device of different batches installation is different, statistics
Batch factor has important references value from historical data to assessing protection device security.
(8) CPU external temperatures offset：The whether normal of relay protection operationally cpu temperature directly affects protection
Normal work, using rated value and limiting value as reference, record CPU external temperature offsets are significant.
(9) CPU usage offset：The respond of the height influence protection of protective relaying device body CPU usage,
Processing speed etc., using average value and permission maximum as reference, record CPU usage offset has important value.
(10) TA temperature offset amounts：The accuracy of online data can be effectively ensured in current transformer TA temperature monitoring,
Using rated value and limiting value as reference, record TA temperature offset amounts can be from the situation for judging protection device operation on one side.
Step 2, according to engineering actual demand, choose specific evaluation index and be used as bottom index；
In the step 2, the specific evaluation index selected by the present embodiment includes：Failure probability, failure consequence, electric power
Not enough desired value, sensitivity coefficient and batch equipment degree of unavailability.
In addition to above-mentioned selection, those skilled in the art can also select other evaluation indexes according to actual requirement of engineering
It is used as bottom index.
Step 3, for selected bottom index by importance carry out tax power；
In this step, specifically the weight of the bottom index can be calculated using improved entropy method and G1 methods, and combined
The result that both calculate obtains comprehensive weight, is that selected bottom index carries out tax power by importance, tax is weighed result of calculation
It is more credible and accurate.
The calculating process to improved entropy method and G1 methods is illustrated below：
The calculating hypothesis evaluation index set of improved entropy method has m factor, allows n expert to carry out tax power to each factor
Weight, then obtain weight matrix F：
rijRepresent tax weights of j-th of expert to i-th of index, wherein i=1,2 ... m, j=1,2 ... n are first to each
The weights of row ask entropy computing to be referred to as row entropy, that is, seek the entropy for the weights that certain expert assigns to m index, andThe formula of row entropy is：
HjWhat is represented is the entropy for the weights that j-th of expert assigns to m index, and this expert is represented when row entropy is bigger
The value of utility that offer weight is brought is small, should give up.A threshold value need to be set for this, gives up expert's imparting more than this threshold value
Weights, according to expertise, we cast out that maximum value of row entropy, it is assumed that given up the weights assigned more than the expert of threshold value,
The weights that also q expert assigns, rebuild weight matrix F' accordingly：
The entropy of every a line of this matrix, that is, q expert are asked again to the entropy of the entitled weights of some index,
Referred to as the weights of F' every a line are first normalized by row entropy before asking for row entropy：
So thatWherein i=1,2 ... m, j=1,2 ... q, can obtain row entropy H accordinglyi：
Work as HiQ expert of bigger explanation has no objection to the tax weights of i-th of index, and recognition rate is high, and accuracy is higher, table
Show that i-th of index will not cause evaluation result larger error occur, it is on the contrary then make evaluation result error greatly, so HiIt is bigger to represent
Index i importance is bigger.Ask for the standard deviation of the i-th row:
WhereinIf σiValue it is bigger represent these experts for same index difference 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, it is utilized
The bottom index weights that improved entropy method is obtained are expressed as：
Wherein, σiFor standard deviation, HiFor row entropy, uiFor scoring average of the expert to bottom index i, bottom index i=1,
2 ... m, m are the bottom index number chosen.
The calculating of G1 methods allows expert according to protective relaying device assessment level to index factor collection { x1,x2,…xmAccording to weight
The property wanted is sorted, and expert is allowed first in index set { x1,x2,…xmSelect and be considered that a most important index is designated as x1 *, it is further continued for
In remaining m-1 index, select and be considered that a most important index is designated as x2 *, by that analogy, by m-1 times choose
Choosing, final remaining evaluation index is designated asAn order relation is thus uniquely determined：
If expert is on evaluation indexWithThe ratio between importance degreeRational judgment it is as shown in table 1 below：
Table 1Assignment reference table
Wherein：
What if expert providedRationality assignment, then the bottom index weights obtained using G1 methods are expressed as：
Wherein, weight is vi, i=k=m, m-1 ... 3,2
By above-mentioned (18), (19) can be obtained finallyValue.
Two kinds of weights of combination obtain comprehensive weight and use equation below：
Wherein, AiIt is exactly the weight of index i after two kinds of weights are combined,
In addition, after the weight combined, when the measured value of some index exceeds normal range (NR), combining weights
Can not accurate response go out its importance in evaluation system, variable weight need to be carried out to it and obtain suitable weight, work as actual measurement
The formula of the upper limit so variable weight that value exceedes normal range (NR) is：
When measured value, less than the lower limit of normal range (NR), then variable weight formula is：
Wherein Ai' (i=1,2 ... m) be index i variable weight, uminAnd umaxRefer respectively to mark i minimum value and maximum
Value uiIt is actual measured value.Variable weight will finally be obtained and combining weights are normalized and can be obtained by each final index
Weight：
Or：
Here, when index i is abnormal index, using (23)；When i is normal index, using (24).A, which is represented, to be integrated
The index of weight and, A ' represents the variable weight sum of abnormal index.
Step 4, the service data according to currently practical power network, determine the measured value of bottom index；
Step 5, search in pertinent literature the reference value that provides to determine the standard value of the bottom index, by the actual measurement
Value and the standard value are contrasted, and the measured value of bottom index is converted into score value；
In this step, the score value of bottom index can rule of thumb be combined the reality of each bottom index by associated specialist
Measured value gives certain score value to this m bottom index, here, and the full marks of each bottom index can enter according to actual conditions
Row setting, for example, can be 100 or 5 points.
Step 6, the tax power result with reference to score value and bottom index calculate and obtain commenting under security of relay protection dimension
Estimate score value.
In this step, the point value of evaluation calculation formula under security of relay protection dimension is：
P=T1s1+T2s2+…+Tmsm；
Wherein, siIt is score value of the expert to bottom index i, Ti is bottom index i tax power result, such as above-mentioned formula 23
Or 24；And i=1,2 ... m.
Above-mentioned evaluation process is described in detail with specific example below, A, B area power grid relay protection dress is chosen
Put the example for analyzing calculating as a comparison, the protection of selection is on active service with batch, applied to 220kV systems, from different manufacturers, with
Under will based on A area power grids protection data carry out various dimensions analysis and assessment calculating, can similarly obtain B area power grids protection analysis knot
Really, specifically：
(1) A area power grids protection security dimension index evaluation analysis.
Based on security of relay protection evaluation index system, A area power grids protect dimension in security dimension index evaluation
The typical bottom index of lower selection, the standard value range determined according to related data, the measured value protected are as shown in table 2 below：
Table 2 protects safety indexes parameter list
First, weight is calculated using improved entropy method：
Reference data according to table 2, obtains index score value as shown in table 3：
The security bottom index score value of table 3
It is 5 to obtain index number m, and expert n is 5, and weight matrix F is：
Obtained giving up maximum, the weight matrix F' reconfigured after the row entropy of 5 experts by formula (12):
As row entropy HiIt is bigger explanation q expert the tax weights of i-th of index are had no objection, recognition rate height, accuracy compared with
On the contrary height, represents that i-th of index will not cause evaluation result larger error occur, then make evaluation result error greatly, so HiMore
The big importance for representing index i is bigger.
By formula (14), (15), (16) can obtain row entropy Hi, standard deviation sigmai, average ui, index weights wiAs shown in table 4：
The improved entropy method safety indexes result of calculation of table 4
Then, weight is calculated using G1 methods：
This known 5 bottom index { x1=failure probability, x2=failure consequence, x3=expected loss of load, x4=spirit
Quick coefficient definite value, x5=protection device security evaluation value }；
Rule of thumb list this 5 indexs from big to small in sequence by associated specialist：{x4≥x1≥x2≥x5≥x3}；
Again it is expressed as：
So rk *Value can allow expert according to table 1 carry out rational judgment:
What if expert providedRationality assignment, then index weightsFor：
It can be obtained finally by above-mentioned (9) (10)Value：
The weighted value of G1 method parameters is as shown in table 5：
The index weightses table that the G1 methods of table 5 are calculated
Comprehensive weight calculating is carried out again：
The weight that obtains of Improved entropy is wiWeight v is obtained with G1 methodsk(i=k=m, m-1 ... 3,2), combines two kinds
Weight obtains comprehensive weight and uses equation below：
Wherein, AiIt is exactly the weight of index i after two kinds of weights are combined.
Comprehensive weight, which can finally be obtained, is：
A1=0.1948, A2=0.1685, A3=0.1577, A4=0.2411, A5=0.2380；
Then the calculating of the point value of evaluation under security of relay protection dimension is carried out again：
Allow expert rule of thumb and certain point is given to this m index with reference to the measured data for obtaining each bottom index
Value, it is assumed that the full marks of each index are 100, then so that the score value of each bottom index combines the synthetic weights of the bottom index
Weight, and they are added to the point value of evaluation obtained under final security dimension, using equation below：
P=T1s1+T2s2+…+Tmsm；
Wherein, si(i=1,2 ... m) it is score value of the expert to index i.
The point value of evaluation P=88.0212 finally calculated.
(2) B electric network protection security dimension analysis and assessment results can similarly be obtained：
The B electric network protection security bottom index score values of table 6
The point value of evaluation P=91.2594 finally calculated.
In summary, the security of relay protection appraisal procedure provided using the embodiment of the present invention can be relay protection
The maintenance management research staff of device provides the operating analysis thinking of protection in security dimension；Due to bottom index selection according to
Difference can be embodied according to stages such as residing maintenance, management, research and development, the present invention considers the problem of bottom index importance is different,
And the method for improved entropy method and G1 method combination weights has been used on this basis, therefore obtained result is more credible, and
This roadmap has flexibility, it is adaptable to the assessment in each stage such as relay protection is safeguarded, management, research and development.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (7)
1. a kind of security of relay protection appraisal procedure, it is characterised in that methods described includes：
Step 1, division security of relay protection evaluation index system；The evaluation index system includes 3 class two-level index：Meter and
Safety indexes, protection definite value security margin index and the protection device safety indexes of shielding failure；
Step 2, according to engineering actual demand, choose specific evaluation index and be used as bottom index；
Step 3, for selected bottom index by importance carry out tax power；
Step 4, the service data according to currently practical power network, determine the measured value of bottom index；
Step 5, search in pertinent literature the reference value that provides to determine the standard value of the bottom index, by the measured value and
The standard value is contrasted, and the measured value of bottom index is converted into score value；
Step 6, the tax power result with reference to score value and bottom index calculate the assessment point obtained under security of relay protection dimension
Value.
2. security of relay protection appraisal procedure according to claim 1, it is characterised in that
The safety indexes of the meter and shielding failure include system load-loss probability, system and lose LOAD FREQUENCY, average cutting load
Duration, load excision desired value, expected loss of load, system severity, failure probability and failure consequence；
The protection definite value security margin index includes sensitivity coefficient, selective determination value and safety factor；
The protection device safety indexes include protection device ATTRIBUTE INDEX, internal software and hardware index, operating index and mixing
Factor index.
3. security of relay protection appraisal procedure according to claim 2, it is characterised in that
The protection device ATTRIBUTE INDEX further comprises there is batch equipment degree of unavailability, manufacturing firm's equipment degree of unavailability and spy
Locking equipment model degree of unavailability；
The internal software and hardware index further comprises thering is supply voltage offset, power source temperature offset, branch current skew
Amount, each branch insulation data offset and optical module light intensity offset；
The operating index further comprise having CPU usage offset, external temperature offset, outer moisture offset and with
Initial data difference offset when putting into operation；
The confounding factor index further comprises thering is TA secondary loop currents offset, TA contact resistances offset, TA temperature
The poor offset of offset, TV three-phase currents and TV residual voltage offsets.
4. security of relay protection appraisal procedure according to claim 1, it is characterised in that selected in the step 2
Specific evaluation index include：Failure probability, failure consequence, expected loss of load, sensitivity coefficient and batch equipment are unavailable
Rate.
5. security of relay protection appraisal procedure according to claim 1, it is characterised in that in the step 3, specific profit
The weight of the bottom index is calculated with improved entropy method and G1 methods, and combines both results of calculating and obtains comprehensive weight, is
Selected bottom index carries out tax power by importance.
6. security of relay protection appraisal procedure according to claim 5, it is characterised in that the utilization improved entropy method is obtained
To bottom index weights be expressed as：
<mrow>
<msub>
<mi>w</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mfrac>
<msub>
<mi>H</mi>
<mi>i</mi>
</msub>
<msub>
<mi>&sigma;</mi>
<mi>i</mi>
</msub>
</mfrac>
<msub>
<mi>u</mi>
<mi>i</mi>
</msub>
</mrow>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>m</mi>
</munderover>
<mfrac>
<msub>
<mi>H</mi>
<mi>i</mi>
</msub>
<msub>
<mi>&sigma;</mi>
<mi>i</mi>
</msub>
</mfrac>
<msub>
<mi>u</mi>
<mi>i</mi>
</msub>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
Wherein, σiFor standard deviation, HiFor row entropy, uiFor scoring average of the expert to bottom index i, bottom index i=1,2 ... m,
M is the bottom index number chosen；
The bottom index weights obtained using G1 methods are expressed as：
<mrow>
<msubsup>
<mi>v</mi>
<mi>m</mi>
<mo>*</mo>
</msubsup>
<mo>=</mo>
<msup>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>+</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>k</mi>
<mo>=</mo>
<mn>2</mn>
</mrow>
<mi>m</mi>
</munderover>
<munderover>
<mo>&Pi;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mi>k</mi>
</mrow>
<mi>m</mi>
</munderover>
<msubsup>
<mi>r</mi>
<mi>i</mi>
<mo>*</mo>
</msubsup>
<mo>)</mo>
</mrow>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msup>
<mo>;</mo>
</mrow>
Wherein, weight is vi, i=k=m, m-1 ... 3,2；
Comprehensive weight is obtained with reference to the result that both calculate to be expressed as：
<mrow>
<msub>
<mi>A</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>w</mi>
<mi>i</mi>
</msub>
<msub>
<mi>v</mi>
<mi>k</mi>
</msub>
</mrow>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>k</mi>
<mo>=</mo>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>m</mi>
</munderover>
<msub>
<mi>w</mi>
<mi>i</mi>
</msub>
<msub>
<mi>v</mi>
<mi>k</mi>
</msub>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
Wherein, AiIt is exactly the weight of bottom index i after two kinds of weights are combined, and
7. security of relay protection appraisal procedure according to claim 1, it is characterised in that in the step 6, it is described after
Point value of evaluation calculation formula under electric protection security dimension is：
P=T1s1+T2s2+…+Tmsm；
Wherein, siIt is score value of the expert to bottom index i, Ti weighs result for bottom index i tax；
And i=1,2 ... m.
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|---|---|---|---|
| CN201710392534.7A CN107239896A (en) | 2017-05-27 | 2017-05-27 | A kind of security of relay protection appraisal procedure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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ID=59985267
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107633354A (en) * | 2017-09-08 | 2018-01-26 | 国家电网公司 | A kind of integrated evaluating method stood with straight-flow system running status health degree |
| CN110209996A (en) * | 2019-05-27 | 2019-09-06 | 中国电力科学研究院有限公司 | It is a kind of for evaluating the method and system of the general level of the health of protective relaying device |
| CN111126821A (en) * | 2019-12-19 | 2020-05-08 | 华北电力大学 | Testability index evaluation method suitable for home-made relay protection of core components |
| CN112103911A (en) * | 2020-11-19 | 2020-12-18 | 国网江西省电力有限公司电力科学研究院 | Hidden fault discrimination method and device for relay protection system |
| CN112686530A (en) * | 2020-12-28 | 2021-04-20 | 贵州电网有限责任公司 | Relay protection operation reliability evaluation method |
-
2017
- 2017-05-27 CN CN201710392534.7A patent/CN107239896A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107633354A (en) * | 2017-09-08 | 2018-01-26 | 国家电网公司 | A kind of integrated evaluating method stood with straight-flow system running status health degree |
| CN110209996A (en) * | 2019-05-27 | 2019-09-06 | 中国电力科学研究院有限公司 | It is a kind of for evaluating the method and system of the general level of the health of protective relaying device |
| CN111126821A (en) * | 2019-12-19 | 2020-05-08 | 华北电力大学 | Testability index evaluation method suitable for home-made relay protection of core components |
| CN112103911A (en) * | 2020-11-19 | 2020-12-18 | 国网江西省电力有限公司电力科学研究院 | Hidden fault discrimination method and device for relay protection system |
| CN112686530A (en) * | 2020-12-28 | 2021-04-20 | 贵州电网有限责任公司 | Relay protection operation reliability evaluation method |
| CN112686530B (en) * | 2020-12-28 | 2022-07-26 | 贵州电网有限责任公司 | Relay protection operation reliability evaluation method |
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Application publication date: 20171010 |