CN109284938A - A kind of comprehensive estimation method and device of power cable line state - Google Patents
A kind of comprehensive estimation method and device of power cable line state Download PDFInfo
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Abstract
The present invention relates to the comprehensive estimation methods and device of a kind of power cable line state, belong to electrical equipment fault detection and diagnostic techniques field, by the panoramic view data for obtaining cable operation, the factor classification that will affect power cable line operating status forms several state indexs, the correlated condition amount for analyzing each state index establishes the status assessment system of cable run；Then the evaluation grade for determining the monitoring data of quantity of state, establishes the subordinating degree function of the corresponding cloud model of each state index, and calculate its corresponding each evaluation grade is subordinate to angle value；Finally determine the weight of each quantity of state of each state index, obtain each quantity of state after correcting by weight is subordinate to angle value, according to the weight of each state index to primary revised be subordinate to angle value and corrected again, obtain each state index is subordinate to angle value, the value is more finally obtained into comprehensive assessment compared with assessed value range as a result, assessing unilateral and erroneous judgement problem caused by avoiding existing monitoring technology single.
Description
Technical field
The invention belongs to electrical equipment fault detections and diagnostic techniques field, and in particular to a kind of power cable line state
Comprehensive estimation method and device.
Background technique
In recent years, with the upgrading of Chinese city power grid, cable as transmit electric power carrier below city gradually
A supply network in large scale is formd, power cable tunnel is to provide huge number of channel cable installation and maked an inspection tour
And the cable building of Totally-enclosed-type, bad environments and cable distribution is numerous in cable tunnel, once it breaks down, it will when serious
Fire can occur and cause the power failure of large area, therefore real-time monitoring to cable run operating status and assessment seem especially heavy
It wants.
Currently, mainly detecting skill by insulation line Measurement Technique, partial discharge monitoring, insulation ag(e)ing water tree
The means such as art, infrared thermal imaging technique, chromatographic technique analyze cable operating status, but all be using it is single
Line monitoring technology analyzes cable status.Due to cable method for monitoring operation states principle difference, and lead to cable
The reason of failure or defect, is also very much, therefore, only reflects that cable operating status is unreasonable and not by single on-line monitoring
Reliably.In addition, master, objective factor in cable operating status evaluation process and depositing, assessment result is caused to have biggish random
Property and uncertainty.
Summary of the invention
The object of the present invention is to provide the comprehensive estimation methods and device of a kind of power cable line state, existing for solving
There is technology to the insecure problem of the status monitoring of power cable.
In order to solve the above technical problems, the present invention proposes a kind of comprehensive estimation method of power cable line state, including
Following steps:
1) panoramic view data of cable run to be assessed is obtained, panoramic view data includes building block and the composition portion of cable run
The quantity of state of part classifies the building block of cable run, state index of every class as a cable run, Mei Gezhuan
State index includes at least one quantity of state；
2) monitoring data of the quantity of state in different moments are obtained, by the monitoring data of quantity of state according to the threshold interval of setting
Classify, every class is as an evaluation grade；The subordinating degree function for establishing the cloud model of each state index calculates each state and refers to
Each quantity of state is subordinate to angle value under corresponding evaluation grade under mark；
3) weight for determining each quantity of state under each state index, using the weight amendment pair of each quantity of state under each state index
Corresponding states amount under state index is answered to be subordinate to angle value under each evaluation grade, it is primary to carrying out according to the weight of each state index
The revised angle value that is subordinate to is corrected again, and obtain each state index is subordinate to angle value, is subordinate to angle value in each state index
Middle selection is maximum to be subordinate to comprehensive assessment value of the angle value as cable run.
Correspondingly, the present invention also proposes a kind of comprehensive evaluating device of power cable line state, including processor, processing
Device for realizing above-mentioned power cable line state comprehensive estimation method.
The present invention passes through the panoramic view data for obtaining cable operation first, will affect the factor of power cable line operating status
Classification forms several state indexs, analyzes the correlated condition amount of each state index, establishes the status assessment body of cable run
System；Then the evaluation grade for determining the monitoring data of quantity of state, establishes the subordinating degree function of the corresponding cloud model of each state index,
And calculate its corresponding each evaluation grade is subordinate to angle value；It finally determines the weight of each quantity of state of each state index, and then obtains
Each quantity of state is subordinate to angle value after being corrected by weight, according to the weight of each state index to carrying out primary revised degree of membership
Value is corrected again, and obtain each state index is subordinate to angle value, which is more finally obtained synthesis compared with assessed value range
Assessment result, avoid monitoring technology in the prior art it is single caused by assessment it is unilateral, erroneous judgement the problems such as；Utilize cloud model medium cloud
The randomness generated and stable taxis are dripped to simulate the various appraisal procedures of existing cable line status to cable run phase
With the different assessed values of state, realize the comprehensive assessment value of each key state index to the uncertain mapping of assessment collection, energy
Enough solve the problems, such as the subjective expectation in existing appraisal procedure according to people distinguish and judge, fault rate it is larger, effectively improve
The accuracy of assessment and comprehensive.
To obtain the panoramic view data of cable run to be assessed, above-mentioned state index includes at least cable body, connector, attached
Two in facility, overvoltage limiter and line channel, wherein connector includes terminal fitting and the transition joint of cable.It is right
These state indexs are answered, it is as follows to list the quantity of state that state index specifically includes:
The quantity of state of cable body includes at least following four: insulation resistance of main, major insulation shelf depreciation, major insulation medium
Loss tangent, oversheath insulation resistance, oversheath earth current, oversheath DC voltage, surface temperature, core electric current,
The operation time limit of cable, historical failure rate, oversheath appearance；
The quantity of state of terminal fitting is including at least following three: hot(test)-spot temperature, connector shelf depreciation, historical failure rate, end
Hold appearance；
The quantity of state of transition joint is including at least following three: connector temperature, connector shelf depreciation, historical failure rate, copper
Casing appearance；
The quantity of state of affiliated facility include at least following three: cross interconnected system plug-in strip contact resistance, grounding box appearance,
Main ground lead ground state, hot(test)-spot temperature；
The quantity of state of overvoltage limiter includes at least following two: limiter appearance, limiter flag indicator, limitation
Device electric property；The quantity of state of line channel includes: the Loss Rate of tunnel auxiliary facility.
For the Evaluated effect for guaranteeing cable run state, the calculating formula of the subordinating degree function of cloud model is as follows:
In formula, k is to be subordinate to angle value, and i is the classification of quantity of state, and j is the classification of evaluation grade, and x is the state of state index
Amount, ExExpectation of the quantity of state at evaluation grade j for being i for classification, EnFor classification be i quantity of state at evaluation grade j
Entropy, HeSuper entropy of the quantity of state at evaluation grade j for being i for classification；kij(x) section is [Ex-3(En+3He),Ex+3(En+
3He)]。
In order to which the monitoring data of lower each quantity of state are become dimensionless number evidence, need to quantity of state each under each state index
Monitoring data carry out following normalized:
For the state index of smaller more excellent type, the normalization formula of quantity of state is as follows:
For the state index of more bigger more excellent type, the normalization formula of quantity of state is as follows:
In formula, XiThe value after monitoring data normalized to indicate quantity of state i, CiIndicate the monitoring data of quantity of state i
Value, C0、Cm、D0、DmIt is setting value.
Detailed description of the invention
Fig. 1 is a kind of comprehensive estimation method flow chart of power cable line state of the invention.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing.
A kind of comprehensive estimation method of power cable line state of the invention, as shown in Figure 1, comprising the following steps:
1) panoramic view data of cable run to be assessed is obtained, panoramic view data includes building block and the composition portion of cable run
The quantity of state of part classifies the building block of cable run, state index of every class as a cable run, Mei Gezhuan
State index includes at least one quantity of state.
Specifically, the factor classification that will affect power cable line operating status forms several state indexs, analysis is every
The correlated condition amount of item state index, establishes the status assessment system of cable run.Wherein, state index include: cable body,
Connector, affiliated facility, overvoltage limiter and line channel.Wherein, connector includes cable terminal fitting and transition joint are (i.e.
Connector on cable run between terminal fitting).The corresponding quantity of state of each state index is as follows:
1. the quantity of state of cable body includes insulation resistance of main, major insulation shelf depreciation, major insulation dielectric loss angle tangent
The operation of value, oversheath insulation resistance, oversheath earth current, oversheath DC voltage, surface temperature, core electric current, cable
The time limit, historical failure rate, oversheath appearance, are denoted as MR respectivelyk、MFk、MTk、WRk、WIk、WVk、BWk、Ik、Yk、Gk、WGk。
2. the quantity of state of terminal fitting includes hot(test)-spot temperature, connector shelf depreciation, historical failure rate, terminal appearance, difference
It is denoted as ZRWik、ZJFik、ZGik、ZWGik.Wherein, hot(test)-spot temperature refers to maximum temperature, is measured by optical fiber temperature-measurement.
3. the quantity of state of transition joint includes connector temperature, connector shelf depreciation, historical failure rate, copper casing appearance, divide
MJW is not denoted as itlk、MJFlk、MGlk、MWGlk.In connector temperature, the maximum temperature of transition joint is hot(test)-spot temperature.
4. the quantity of state of affiliated facility includes cross interconnected system plug-in strip contact resistance, grounding box appearance, main ground lead
Ground state, hot(test)-spot temperature, are denoted as FR respectivelyk、FWGk、FXk、FRWk.Affiliated facility includes cross interconnected system plug-in strip, ground connection
Case, main ground lead and hot spot.
5. the quantity of state of overvoltage limiter includes limiter appearance, limiter flag indicator, limiter electric property,
It is denoted as VWG respectivelylk、VDlk、VXlk。
6. the quantity of state of line channel includes the Loss Rate of tunnel auxiliary facility, it is denoted as Dk。
In above-mentioned quantity of state, k is sample collection serial number, and k is 1 integer for arriving N, and l is indicated belonging to corresponding state amount first
State index, for example, ZRWlkIndicate the hot(test)-spot temperature of first of terminal fitting, MJWlkIndicate the connector temperature of first of transition joint
Degree, VWGlkIndicate the limiter appearance of first of overvoltage limiter.In addition, above-mentioned state index can according to need and be set
It sets, but at least to include that two state indexs equally can according to need and be configured for the quantity of state of each state index,
Specifically, the quantity of state of cable body at least selects four, the quantity of state of terminal fitting at least selects three, the shape of transition joint
State amount at least selects three, and the quantity of state of affiliated facility at least selects three, and the quantity of state of overvoltage limiter at least selects two
It is a.
2) monitoring data of the quantity of state in different moments are obtained, by the monitoring data of quantity of state according to the threshold interval of setting
Classify, every class is as an evaluation grade；The subordinating degree function for establishing the cloud model of each state index calculates each state and refers to
Each quantity of state is subordinate to angle value under corresponding evaluation grade under mark.
Specifically, the monitoring data to each quantity of state under each state index of acquisition carry out following normalized:
For the state index of smaller more excellent type, the normalization formula of quantity of state is as follows:
For the state index of more bigger more excellent type, the normalization formula of quantity of state is as follows:
In formula, xiThe value after monitoring data normalized to indicate quantity of state i, CiIndicate the monitoring data of quantity of state i
Value, C0、Cm、D0、DmIt is setting value, it is preferred that Cm、DmFor the demand value of quantity of state i, indicate that primary monitoring data value is greater than Cm
Or it is less than, is equal to DmWhen should arouse attention, C0、D0For the factory-said value or optimal value of quantity of state i.
Value after the monitoring data normalized of each quantity of state is subjected to following state cloud processing:
The n data x of input state amount parameter xi(1≤i≤n) calculates separately the parameter E of data mode cloudx, En, He。
Sample average are as follows:
Sample variance are as follows:
It is expected that ExAre as follows:
Entropy EnAre as follows:
Super entropy HeAre as follows:
According to above-mentioned parameter, the calculating formula of the subordinating degree function of cloud model is as follows:
In formula, k is to be subordinate to angle value, and i is the classification of quantity of state, and j is the classification of evaluation grade, by the monitoring data of quantity of state
To classify according to the threshold interval of setting, every class is as an evaluation grade, such as is divided into four classes, then j=1, and 2,3,4, point
It is not expressed as the scoring of normal condition, attention state, abnormality, severe conditions.Among the above, x is the quantity of state of state index,
ExExpectation of the quantity of state at evaluation grade j for being i for classification, EnEntropy of the quantity of state at evaluation grade j for being i for classification, He
Super entropy of the quantity of state at evaluation grade j for being i for classification；kij(x) section is [Ex-3(En+3He),Ex+3(En+3He)]。
The subordinated-degree matrix between each state index and each evaluation grade can be obtained based on above-mentioned steps are as follows:
K1=(kij)11×4I=1,2 ..., 11j=1,2,3,4
K2=(kij)4×4I=1,2,3,4j=1,2,3,4
K3=(kij)4×4I=1,2,3,4j=1,2,3,4
K4=(kij)4×4I=1,2,3,4j=1,2,3,4
K5=(kij)3×4I=1,2,3j=1,2,3,4
K6=(kij)1×4I=1j=1,2,3,4
In formula, K1~K6Respectively correspond state index cable body, terminal fitting, nonterminal connector, affiliated facility, excessively electric
Press limiter, the line channel subordinated-degree matrix under four kinds of evaluation grades respectively.
3) the weight vectors W of each quantity of state of each state index is determined using Information Entropypm, using each shape of each state index
The weight vectors W of state amountpmSubordinated-degree matrix of the corresponding states amount under corresponding evaluation grade under corresponding states index is corrected, such as
Under:
R1=(ω1i)1×11*(kij)11×4=(r11,r12,r13,r14)
R2=(ω1i)1×4*(kij)4×4=(r21,r22,r23,r24)
R3=(ω1i)1×4*(kij)4×4=(r31,r32,r33,r34)
R4=(ω1i)1×4*(kij)4×4=(r41,r42,r43,r44)
R5=(ω1i)1×4*(kij)4×4=(r51,r52,r53,r54)
R6=K6=(kij)1×4=(r61,r62,r63,r64)
The weight vectors W of each state index is determined using Information Entropy againp, using the weight vectors W of each state indexpAmendment
Above-mentioned subordinated-degree matrix, and then the status assessment value of power cable line is obtained, calculating process is as follows:
In formula, Wp=(ω1 ω2 ω3 ω4 ω5 ω6), wherein ω1、ω2、ω3、ω4、ω5、ω6It is followed successively by six
The weight of state index, Y=(y1y2y3y4) be power cable line status assessment value.
According to most relevance degree principle, the maximum angle value that is subordinate to is chosen as cable run comprehensive assessment value y are as follows:
Y=max (y1 y2 y3 y4)
After the comprehensive assessment value for selecting cable run, by the comprehensive assessment value and the assessed value range of setting (as assessment collects)
Compare, determines the comprehensive assessment of cable run as a result, assessment collection is shown in Table 1.
Table 1
The method that weight can also be calculated using other for the weight of each quantity of state of each state index of determination, the present embodiment
Instead of, such as analytic hierarchy process (AHP).
The comprehensive estimation method of power cable line state used by the present embodiment is comprehensive from the angle of entire route
Closing panoramic data analysis influences the evaluation index of cable run operating status, finally obtains the comprehensive assessment knot of route operating status
Fruit instructs the O&M decision and optimization design of cable run according to assessment result, evades potential risk, ensure the peace of cable run
Full stable operation.In addition, this implementation realizes comprehensive assessment using cloud model, using Clouds theory by ambiguity in fuzzy theory and
Randomness in probability theory effectively combines, and realizes qualitative and quantitative mutual mapping, can be more objectively to status assessment process
Middle qualitative index carries out quantification treatment, realizes to the comprehensive objective assessment of cable operating status.
The present invention also mentions a kind of comprehensive evaluating device of power cable line state, including processor, and processor is for real
The comprehensive estimation method of power cable line state in now this implementation.The comprehensive assessment of the power cable line state of above-mentioned meaning
Device, is actually based on a kind of computer solution of the method for the present invention process, i.e., a kind of software architecture can be applied to
In computer, above-mentioned apparatus is treatment progress corresponding with method flow.Since the introduction to the above method is enough
It is clear and complete, therefore be no longer described in detail.
Claims (6)
1. a kind of comprehensive estimation method of power cable line state, which comprises the following steps:
1) panoramic view data of cable run to be assessed is obtained, panoramic view data includes the building block and building block of cable run
Quantity of state classifies the building block of cable run, and state index of every class as a cable run, each state refers to
Mark includes at least one quantity of state；
2) monitoring data of the quantity of state in different moments are obtained, the monitoring data of quantity of state are carried out according to the threshold interval of setting
Classification, every class is as an evaluation grade；The subordinating degree function for establishing the cloud model of each state index calculates under each state index
Each quantity of state is subordinate to angle value under corresponding evaluation grade；
3) weight for determining each quantity of state under each state index corrects corresponding shape using the weight of each quantity of state under each state index
Corresponding states amount is subordinate to angle value under each evaluation grade under state index, according to the weight of each state index to once being corrected
The angle value that is subordinate to afterwards is corrected again, and obtain each state index is subordinate to angle value, is selected in being subordinate in angle value for each state index
The maximum comprehensive assessment value for being subordinate to angle value as cable run is taken, by the comprehensive assessment value compared with the assessed value range of setting
Relatively obtain comprehensive assessment result.
2. the comprehensive estimation method of power cable line state according to claim 1, which is characterized in that the state refers to
Mark includes at least two in cable body, connector, affiliated facility, overvoltage limiter and line channel, and the connector includes
The terminal fitting of cable and transition joint.
3. the comprehensive estimation method of power cable line state according to claim 2, which is characterized in that each state index
Corresponding quantity of state is as follows:
The quantity of state of cable body includes at least following four: insulation resistance of main, major insulation shelf depreciation, major insulation dielectric loss
Angle tangent value, oversheath insulation resistance, oversheath earth current, oversheath DC voltage, surface temperature, core electric current, cable
The operation time limit, historical failure rate, oversheath appearance；
The quantity of state of terminal fitting includes at least following three: hot(test)-spot temperature, connector shelf depreciation, historical failure rate, outside terminal
It sees；
The quantity of state of transition joint is including at least following three: connector temperature, connector shelf depreciation, historical failure rate, copper shell
Appearance；
The quantity of state of affiliated facility includes at least following three: cross interconnected system plug-in strip contact resistance, grounding box appearance, master connect
Ground wire ground state, hot(test)-spot temperature；
The quantity of state of overvoltage limiter includes at least following two: limiter appearance, limiter flag indicator, limiter electricity
Gas performance；
The quantity of state of line channel includes: the Loss Rate of tunnel auxiliary facility.
4. the comprehensive estimation method of power cable line state according to claim 1, which is characterized in that the cloud model
Subordinating degree function calculating formula it is as follows:
In formula, k is to be subordinate to angle value, and i is the classification of quantity of state, and j is the classification of evaluation grade, and x is the quantity of state of state index, Ex
Expectation of the quantity of state at evaluation grade j for being i for classification, EnEntropy of the quantity of state at evaluation grade j for being i for classification, HeFor
Classification is super entropy of the quantity of state of i at evaluation grade j；kij(x) section is [Ex-3(En+3He),Ex+3(En+3He)]。
5. the comprehensive estimation method of power cable line state according to claim 1, which is characterized in that in step 2)
It establishes before the subordinating degree function of the cloud model of each state index, further includes the monitoring data to quantity of state each under each state index
Carry out following normalized:
For the state index of smaller more excellent type, the normalization formula of quantity of state is as follows:
For the state index of more bigger more excellent type, the normalization formula of quantity of state is as follows:
In formula, XiThe value after monitoring data normalized to indicate quantity of state i, CiIndicate the monitoring data value of quantity of state i,
C0、Cm、D0、DmIt is setting value.
6. a kind of comprehensive evaluating device of power cable line state, which is characterized in that including processor, processor for realizing
Comprehensive estimation method as described in any one of claim 1-5 claim.
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| CN111754102A (en) * | 2020-06-22 | 2020-10-09 | 中国电力科学研究院有限公司 | Method and system for determining operation quality of distribution cable equipment |
| CN111965497A (en) * | 2020-06-22 | 2020-11-20 | 内蒙古大唐国际托克托发电有限责任公司 | High-voltage cable early defect joint diagnosis method |
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| CN114166890A (en) * | 2021-11-05 | 2022-03-11 | 西南交通大学 | Method for estimating running age of vehicle-mounted EPR cable |
| CN116839650A (en) * | 2023-08-25 | 2023-10-03 | 南通龙海电子科技有限公司 | Intelligent instrument verification system and method |
| CN116839650B (en) * | 2023-08-25 | 2023-12-22 | 南通龙海电子科技有限公司 | Intelligent instrument verification system and method |
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