CN105866638B - A kind of city net cable connector state of insulation on-line monitoring prior-warning device and method - Google Patents
A kind of city net cable connector state of insulation on-line monitoring prior-warning device and method Download PDFInfo
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- CN105866638B CN105866638B CN201610218568.XA CN201610218568A CN105866638B CN 105866638 B CN105866638 B CN 105866638B CN 201610218568 A CN201610218568 A CN 201610218568A CN 105866638 B CN105866638 B CN 105866638B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/12—Measuring electrostatic fields or voltage-potential
Abstract
The invention discloses a kind of city net cable connector state of insulation on-line monitoring prior-warning device and methods.Device includes data acquisition module, signal modulation module, central data processing module, communication module, background monitoring platform and power module, the wherein described data acquisition module is installed at cable connector, the output end of data acquisition module and the input terminal of signal modulation module connect, the output end of signal modulation module is connect with the data input pin of central data processing module, the output end of central data processing module is connect with communication module, and power module is connect with the power end of central data processing module.Characteristic quantity appropriate is selected using Weighted Average Algorithm, by maps feature vectors to higher dimensional space, the weight of associated vector is solved by analytic hierarchy process (AHP), in conjunction with practical experience to membership function of the foundation with good correspondence in each dielectric features amount, so as to make full use of every insulation parameter, the state of insulation judgement of cable is accurately and real-time carried out.
Description
Technical field
The present invention relates to insulation state monitoring field, more particularly to a kind of city net cable connector state of insulation on-line monitoring is pre-
Alarm method and device.
Background technology
Power cable is the important component of electric system, with the development that enterprise produces, to the continuous of electricity needs
Increase, the usage amount of power cable is also increasing year by year, and the operation of the production requirement power cable of modern enterprise must be long
It is phase, continuous and safety and stability.For a long time, the generation of accident in order to prevent, it is hard always to the equipment in Operation of Electric Systems
Hold the system for periodically carrying out preventive trial.This prevents accident to ensureing that equipment is safely and reliably run in the power system
Generation has served good.But with the development of power generation, traditional routinely prophylactic tria can not meet peace
The needs produced entirely.This is because routinely prophylactic tria needs the test that has a power failure, and test interval is long twice, so
It is not easy the insulation defect of timely discovering device, and power failure can also cause certain loss.
Research has shown that cable connector is place most weak in whole cable, and the place most easily broken down, it is right
Cable connector is monitored on-line, and detection cycle can be shortened, and improves the probability for finding insulation defect in time, to reduce insulation
Accident.Cable connector is monitored on-line, and then realizes the inline diagnosis of butt joint insulation, to make electric system from prevention
Property repair step transition to predict the sexual stage.This is because the deterioration of insulation, the development of defect, although with statistics, development
Speed also faster or slower, but most of have certain period of expansion.In the meantime, insulation can send out reflection state of insulation variation
Various physical chemistry information.Pass through the integrated treatment to these information, so that it may judged with the reliability to cable connector and
Insulation life is made prediction, and provides early warning or defined operation when necessary.Due to so both can be to avoid the expansion because of insulation defect
Caused accident, can also avoid blindly having a power failure carries out preventive trial.
Invention content
The present invention cannot meet current electric grid demand for city net cable connector state of insulation method of real-time and device
Present situation, provide a kind of stabilization, it is rapid and can real-time and precise on-line monitoring city net cable connector state of insulation device and side
Method.The characteristics of present invention is according to cable connector insulation parameter, in conjunction with average weighted method.Using being installed in cable connector surface
Veneer temperature sensor and electric-field sensor and the high-frequency electrical pulses flow sensor on ground wire and capacity fall off
Flow sensor measures electric field intensity signal, pulse current of PD signal, cable connector veneer temperature signal and the electricity of cable
Hold leakage current signal, collected signal is utilized into weighted mean method logarithm by being sent to background monitoring platform after data processing
According to analysis calculating is carried out, to realize by measuring electric field strength, pulse current of PD, cable connector veneer temperature and capacitance
Leakage current determines the state of insulation of cable connector, and online prison in real time is carried out to city net cable connector operating status to realize
It surveys.
The present invention adopts the following technical scheme that achieve the goals above：A kind of city net cable connector state of insulation is supervised online
Prior-warning device is surveyed, including data acquisition module, signal modulation module, central data processing module, communication module, background monitoring are put down
Platform and power module, wherein the data acquisition module is installed at cable connector, the output end and signal of data acquisition module
The input terminal of modulation module connects, and the output end of signal modulation module is connect with the data input pin of central data processing module,
The output end of central data processing module is connect with communication module, and power module and the power end of central data processing module connect
It connects.
The data acquisition module includes electric-field sensor, veneer temperature sensor, High Frequency Current Sensor and Zero flux
Hall current sensor acquires electric field intensity signal, cable connector veneer temperature signal, pulse current of PD signal respectively
With capacitor leakage current signal, by the above signal input signal modulation module；Signal modulation module carries out rectification, filtering, at amplification
Then reason inputs central data processing module；Central data processing module handles the signal received in real time, obtains electricity
Field intensity value, cable connector veneer temperature value, the pulse frequency of pulse current of PD and peak value, capacitor leakage current are effective
Value, is then packaged and is sent to communication module, background monitoring platform is sent to by communication module；Background monitoring Platform evaluation
The state of insulation of cable connector.
There is better effect on the basis of apparatus above, the electric-field sensor and veneer temperature sensor are mounted on
Cable connector surface, the High Frequency Current Sensor and Zero flux Hall current sensor are mounted on ground wire.
Power module uses solar electric power supply system, and the voltage of controller output is about 6.0V, output end and electric power storage
The input terminal in pond connects, and power supply is provided for the work of whole device using accumulator.
Change of the background monitoring platform to capacitor leakage current, pulse current, electric field strength and cable connector veneer temperature
Change trend is shown.Staff can be with these data of real time inspection, in order to monitor cable connector by logging in client
The variation of insulation status, staff can estimate the state of insulation of cable connector before cable connector breaks down
Then it takes appropriate measures, reduces the probability that cable connector breaks down.Background monitoring platform passes through the data received
Cable connector state of insulation is assessed after core algorithm, and cable connector is repaired or replaced in time convenient for staff.
The present invention also provides a kind of city net cable connector state of insulations to monitor method for early warning on-line, includes the following steps：
A), data collecting module collected electric field intensity signal, cable connector veneer temperature signal, pulse current of PD
Signal and capacitor leakage current signal carry out rectification, filtering, enhanced processing through signal modulation module, then input at central data
Manage module；Central data processing module handles the signal received in real time, obtains electric field intensity value, cable connector veneer
Temperature value, the pulse frequency of pulse current of PD and peak value, capacitor leakage current virtual value, are then packaged and are sent to
Communication module is sent to background monitoring platform by communication module；
B), background monitoring platform handles the data received：
1. establishing set of eigenvectors, set of eigenvectors is A={ a1, a2, a3, a4, a5 }={ electric field intensity value is locally put
Electric pulse current peak value, the pulse frequency of pulse current of PD, cable connector veneer temperature, capacitor leakage current virtual value }；
2. determining the weight of feature vector using analytic hierarchy process (AHP)；
3. establishing state of insulation standard, L={ l1, l2, l3, l4}={ is excellent, good, in, it is poor }；
4. establishing membership function, the membership function being distributed using ridge type；
5. state of insulation comprehensive assessment, is completed using Weighted Average Algorithm, wherein relational expression is：
In formula, yiIndicate Condition assessment of insulation as a result, wiIndicate the weight of each feature vector, rijIndicate each feature vector
Degree of membership；N indicates the number of feature vector.
Apparatus of the present invention utilize the veneer temperature sensor and electric-field sensor that are installed in cable connector surface and installation
The electric field strength of high-frequency electrical pulses flow sensor and the collected cable connector of capacity fall off flow sensor on ground wire is believed
Number, pulse current of PD signal, cable connector veneer temperature signal and capacitor leakage current signal, collected signal is led to
It is sent to background monitoring platform after crossing data processing, background monitoring platform is carried out recording storage in time and be calculated, in case follow-up event
Barrier processing and analysis.Device has very strong anti-interference ability, and the various types of signal of acquisition is accurate, and data processing speed is quick, adopts
Ensure that device operates for a long time with that can power very much, can also be safeguarded and more new system by online upgrading.
Core algorithm of the present invention is to select characteristic quantity appropriate using Weighted Average Algorithm, by maps feature vectors to higher-dimension
Space is solved the weight of associated vector by analytic hierarchy process (AHP), had to the foundation of each dielectric features amount in conjunction with practical experience
The membership function of good correspondence accurately and real-time carries out the insulation shape of cable so as to make full use of every insulation parameter
State judges.This method is directed to the one-sidedness and locality of cable connector on-line monitoring, exhausted by acquiring a variety of reflection cable connectors
Each feature vectors of edge state analyze collected various features vector using fuzzy theory comprehensively, are stood from comprehensive
The angle of body assesses cable connector state of insulation.
Description of the drawings
Fig. 1 is the system structure diagram of apparatus of the present invention；
Fig. 2 is core of the invention algorithm flow chart；
Fig. 3 is the operational flowchart of the present invention；
Fig. 4 is membership function schematic diagram.
Specific implementation mode
Technical scheme of the present invention is described further below in conjunction with attached drawing.
Cable connector state of insulation monitors prior-warning device on-line referring to Fig.1, and the connection between composition and module is such as
Under：
The device include data acquisition module 1, signal modulation module 2, central data processing module 3, communication module 4, after
Platform monitor supervision platform 5 and power module 6, wherein the data acquisition module 1 is installed at cable connector, data acquisition module 1
Output end is connect with the input terminal of signal modulation module 2, output end and the central data processing module 3 of signal modulation module 2
Data input pin connects, and the output end of central data processing module 3 is connect with communication module 4, at power module 6 and central data
Manage the power end connection of module 3.
Wherein data acquisition module 1 is by electric-field sensor module, High Frequency Current Sensor module, veneer temperature sensor mould
Block, Zero flux Hall current sensor module composition；The various signals of acquisition are carried out rectification, filter, put by signal modulation module
It is big to wait modulation；Collected various signals are carried out timely calculation processing and packing by central data processing module；Communication module is adopted
With GPRS communication modules (General Packet Radio Service), mainly work as to be sent to background monitoring server
Each parameter of preceding reflection cable connector state of insulation, background monitoring platform carries out record storage in time, and uses weighted mean method
Assessment cable connector state of insulation is calculated to data analysis meter, convenient for the early warning to cable and junction malfunction.The wherein center of the system
Data processor uses STM32L151VBT6 chips.
The cable connector veneer temperature sensor and electric-field sensor that apparatus of the present invention are arrived by data collecting module collected
And the electricity of the high-frequency electrical pulses flow sensor and the collected cable connector of capacity fall off flow sensor on ground wire
Field intensity signal, pulse current of PD signal, cable connector veneer temperature signal and capacitor leakage current signal, by signal into
The central data processing module that the present apparatus is sent to after row modulation carries out calculation processing and packing, and can analyzing calculating, treated
Data information is sent to background monitoring platform by data information by communication module, and background monitoring platform carries out record storage in time
And assessment cable connector state of insulation is calculated to data analysis meter using weighted mean method, convenient for the early warning to cable and junction malfunction.
The core algorithm of city net cable connector state of insulation on-line monitoring early warning includes the following steps with reference to Fig. 2：
A), the electric field strength of Usage data collection module acquisition cable connector, the peak value of pulse current of PD, pulse
The signals such as the size of the frequency (120 pulse per second (PPS) number), cable connector veneer temperature and capacitor leakage current；
B), several characteristic quantities of concentrated expression cable connector state of insulation determine that insulation is special using Weighted Average Algorithm
The mapping relations of sign amount and state of insulation；
Characteristic quantity appropriate is selected using Weighted Average Algorithm, by maps feature vectors to higher dimensional space, passes through level point
Analysis method solves the weight of associated vector, in conjunction with practical experience to person in servitude of the foundation with good correspondence in each dielectric features amount
Category degree function accurately and real-time carries out the state of insulation judgement of cable so as to make full use of every insulation parameter.
The processing step of background monitoring platform is as follows in the above city net cable connector state of insulation on-line monitoring method for early warning：
1, set of eigenvectors is established
Set of eigenvectors is A={ a1, a2, a3, a4, a5 }={ electric field intensity value, pulse current of PD peak value, office
Portion's discharge pulse current pulse frequency, cable connector veneer temperature, capacitor leakage current virtual value }；Here, feature vector is concentrated
Each feature vector indicates that electric field intensity value, T indicate that cable connector veneer temperature, Qp indicate that pulse current peak, Qf indicate with E
The pulse current pulse frequency, Qi indicate capacitor leakage current virtual value.
2, the weight of each feature vector is determined using analytic hierarchy process (AHP)
1) judgment matrix is established
In analytic hierarchy process (AHP), the element that judgment matrix B is concentrated by feature vector compares to obtain two-by-two, and two between making element
When two multilevel iudges, quantitatively indicated using the significance level of element ratio another element, the mark of specific judgment matrix
Spending meaning, it is as shown in the table.
Judgment matrix scale and meaning
2) weight of each feature vector is solved
Solution formula：
In formula, wiIndicate the weight of each feature vector, aijIndicate that the element that feature vector is concentrated, n indicate feature vector
Number.
3, state of insulation standard is established
L={ l1, l2, l3, l4}={ is excellent, good, in, it is poor }.
Cable connector state of insulation is good using excellent, in, poor three grades；" excellent " expression cable connector state of insulation is good；
" good " expression cable connector insulation performance is declined, in aging early stage；" in " indicate that the insulation performance of cable connector is apparent
Decline, cable is in aging mid-term, should reinforce monitoring and keeping a close eye on any abnormal conditions that cable connector may occur；" poor "
Indicate the insulation performance degradation of cable connector, cable is in aging latter stage, need interruption maintenance find out failure cause or into
Row is replaced.
4, membership function is established
Element is evaluated when cable connector operational excellence only to fluctuate in some normal range (NR), occurs just deviate when insulation degradation
Normal range (NR), if therefore cable insulation state change, transition portion should have non-linear.It can by degree of membership assigning method
Know, the parameter in the membership function of ridge type distribution has preferable correspondence with assessment coefficients conversion, and physical significance is clear, therefore
Cable connector membership function is used as using the distribution of ridge type, referring to Fig. 4.
Degree of membership of the element to each state of insulation is respectively evaluated using equations.
In formula, A (x) indicates that the degree of membership of feature vector, x indicate the value of feature vector, b0, b1Indicate that " excellent " turns " good " mistake
The boundary value crossed, b2, b3Indicate " good " turn " in " boundary value of transition, b4, b5Indicate " in " turn the boundary value of " poor " transition, b0,
b1, b2, b3, b4, b5It is determined in combination with practical experience.
5, state of insulation comprehensive assessment
State of insulation comprehensive assessment is completed by relational expression Y=W ο R, and Y indicates Condition assessment of insulation as a result, W indicates each spy
The weight of vector is levied, R indicates the degree of membership of each feature vector.It is using the operator of weighted average type, relational expression in formula：
In formula, yiIndicate Condition assessment of insulation as a result, wiIndicate the weight of each feature vector, rijIndicate each feature vector
What degree of membership, i.e. previous step obtained；N indicates the number of feature vector.
The final insulation assessment result for having obtained each parameter judges the state of insulation of cable connector, realization pair according to result
The on-line monitoring assessment of cable connector state of insulation.
The city net cable connector state of insulation on-line monitoring method for early warning and device that the present invention studies, can be used for netting electricity to city
Cable joint insulation situation is monitored on-line.By real time on-line monitoring cable connector state of insulation, cable can be understood in real time and connect
The case where head state of insulation, can provide good data reference, to work for the safe, reliable, efficient operation of cable
Personnel make rational processing by monitoring state.Meanwhile background monitoring platform supports the storage extension of initial data, timing to remember
Initial data is recorded, providing data for investigation reason after breaking down supports, to realize Quick overhaul and the replacement of cable.
Claims (3)
1. a kind of city net cable connector state of insulation monitors method for early warning on-line, which is characterized in that include the following steps：
A), data acquisition module (1) acquisition electric field intensity signal, cable connector veneer temperature signal, pulse current of PD
Signal and capacitor leakage current signal carry out rectification, filtering, enhanced processing through signal modulation module (2), then input central data
Processing module (3)；Central data processing module (3) handles the signal received in real time, obtains electric field intensity value, cable
Connector veneer temperature value, the pulse frequency of pulse current of PD and peak value, capacitor leakage current virtual value, are then packaged
And it is sent to communication module (4), background monitoring platform (5) is sent to by communication module (4)；
B), background monitoring platform (5) handles the data received：
1. establishing set of eigenvectors, set of eigenvectors is A={ a1, a2, a3, a4, a5 }={ electric field intensity value, shelf depreciation arteries and veins
Rush current peak, the pulse frequency of pulse current of PD, cable connector veneer temperature, capacitor leakage current virtual value }；
2. determining the weight of feature vector using analytic hierarchy process (AHP)；
3. establishing state of insulation standard, L={ l1, l2, l3, l4}={ is excellent, good, in, it is poor }；
4. establishing membership function, the membership function being distributed using ridge type；
5. state of insulation comprehensive assessment, is completed using Weighted Average Algorithm, wherein relational expression is：
In formula, yiIndicate Condition assessment of insulation as a result, wiIndicate the weight of each feature vector, rijIndicate being subordinate to for each feature vector
Degree, n indicate the number of feature vector.
2. a kind of city net cable connector state of insulation monitors method for early warning on-line according to claim 1, it is characterised in that：Step
The weight of the rapid 2. described determining feature vector, compares the element that feature vector is concentrated to obtain judgment matrix two-by-two；Utilize with
Lower weight equation solves the weight of feature vector；
In formula, wiIndicate the weight of each feature vector, aijIndicate that the element that feature vector is concentrated, n indicate the number of feature vector.
3. a kind of city net cable connector state of insulation monitors method for early warning on-line according to claim 1, it is characterised in that：Step
Suddenly the 4. described membership function is：
In formula, A (x) indicates that the degree of membership of feature vector, x indicate the value of feature vector, b0, b1Indicate that " excellent " turns " good " transition
Boundary value, b2, b3Indicate " good " turn " in " boundary value of transition, b4, b5Indicate " in " turn the boundary value of " poor " transition.
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