CN106199194B - A kind of mine cable insulation EP rubbers surface electricity trace state feature extracting method - Google Patents
A kind of mine cable insulation EP rubbers surface electricity trace state feature extracting method Download PDFInfo
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- CN106199194B CN106199194B CN201610541127.3A CN201610541127A CN106199194B CN 106199194 B CN106199194 B CN 106199194B CN 201610541127 A CN201610541127 A CN 201610541127A CN 106199194 B CN106199194 B CN 106199194B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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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
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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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Abstract
A kind of mine cable insulation EP rubbers surface electricity trace state feature extracting method, selection and extracting method including surface electricity trace characteristic quantity；The selection of the surface electricity trace characteristic quantity derive from insulation resistance signal, polarization-depolarization current signal and return voltage signal, will from three kinds of status signals extract characteristic quantity combine can the surface electricity trace state to borehole cable EP rubbers characterize；The extracting method of the surface electricity trace characteristic quantity is temporal signatures amount extracting method, and the method is mainly to extract starting point, stable point, initial slope and the inflection point of signal waveform.The present invention reflects mine cable insulation with EP rubbers surface electricity trace state, can provide judgment basis with the diagnosis of EP rubbers surface electricity trace state and life appraisal for mine cable.
Description
Technical field
The present invention relates to mine power equipment condition monitoring and fault diagnosis fields, especially a kind of to be believed based on dielectric response
Number borehole cable EP rubbers surface electricity trace state feature extracting method.
Background technique
Mine high-voltage cable is one of the capital equipment in Coal Mine Power Distribution System, and effect is the continuous reliable of guarantee electric energy
Transmission, to guarantee the safety and high efficiency of coal production.With the continuous improvement of coal production power, power supply system under mine
Voltage class is also correspondingly improved, wherein based on 10kV.It is ethylene propylene rubber insulated for the high-tension cable of 10kV
Cable is widely used as ship and coal mine service cable with its excellent resistance to vapor, weatherability and flexibility.Although the third rubber of second
Glue cable performance is excellent, but in its actual moving process, inevitably will receive electricity, heat, mechanical stress and acid,
The effect of alkali, salt, coal dust causes insulation ag(e)ing, reduces insulation performance, and then cause creeping discharge, forms insulating surface
Electric trace corrosion.Since underground coal mine is there are gas explosion danger, electric discharge would be possible to cause fire or explosion, seriously affect underground
Personnel and property safety, it is therefore necessary to which the surface electricity trace state representation method of mining ethylene propylene rubber insulated cable is ground
Study carefully.
In existing research, " research of insulating polymeric material electricity trace characteristic " uses the fractal dimension and use in discharge process
Wavelet transformation analyzes interelectrode discharge energy and carries out detailed analysis to the flash-over characteristic in the electricity trace forming process of surface, and in detail
Carefully analyzing two environmental factors of air pressure and temperature influences the resistance to electric trace characteristic of insulating materials；The poly- of flame retardant is smelt to add
Carbonic ether is test product, by calculating the discharge capacity of addition different flame retardant content test product, discharge energy, test contact angle, comparing
The relevant parameters such as tracking index are smelt the influence of flame retardant electric trace characteristic resistance to insulating materials to analyze addition, and are passed through
Change the temperature of test, to analyze the variation of its electric property under room temperature and hot environment.
" research of the gamma beta radiation to polymeric dielectric tracking failure phenomena impair " is with polybutylene naphthalate
(PBN), polybutylene terephthalate (PBT) (PBT), polyethylene terephthalate (PET), epoxy resin (EX), poly- carbon
The common polymers dielectrics such as acid esters (PC) are sample, use 60Co gamma-ray emission source with 10kGy/h radiance pair
Sample carries out radiation treatment, and amount of radiation respectively reaches 100kGy and 1000kGy, is based on needle-plate tracking failure and IEC60112
Resistance to electricity trace experimental method has been investigated emphatically high-energy radiation and its has been showed with the tracking failure under low pressure, high-intensity magnetic field radiation recombination environment
As.
The epoxy of " epoxide resin nano complex media surface charge dynamic characteristic and tracking failure are studied " voluntarily to prepare
Resin/TiO2Nano-filled composite is sample, and it is existing to have studied corona discharge under direct current and pulse voltage using electrometer
As the characteristic and influence factor of generated surface charge accumulation and dissipation, TiO has been obtained2Nano particle accumulates surface charge
With the affecting laws of dissipation characteristic；Based on needle-plate tracking failure experimental method, have studied under direct current and pulse voltage along face electricity trace
Breakoff phenomenon has obtained TiO2Nano particle analyzes to the affecting laws of its tracking failure characteristic and each species diversity occurs
Reason and mechanism.
" the resistance to electric trace Journal of Sex Research of insulating material of polymer and its nonlinear analysis " uses recurrence diagram technology, recurrence quantification analysis
Method reconstructs chaos attractor, Poincare section method and calculates the non-linear fingers such as fractal dimension, maximum lyapunov exponent
Mark provides visualization (such as chaos attractor, recurrence plot, Poincare section) or quantitative (such as recurrence quantification index) method, takes off
Show kinetic characteristics of the discharge current in m dimension phase space.
As existing research it is found that in terms of existing research method mainly concentrates on tracking failure mechanism and locating for insulation
The influence of environmental condition and addition nano particle electric trace performance resistance to insulating materials；The third rubber of second is not used for mine cable insulation
The surface electricity trace state evaluating method of glue is specialized in；Surface electricity trace assessment for mine cable insulation EP rubbers
Deficiency state assesses sample, and data are not enriched.
Therefore, it is necessary to be studied with EP rubbers surface electricity trace state feature extracting method mine cable insulation, make
Not only carried out specifically for mine cable insulation with EP rubbers surface electricity trace phenomenon, and can be in tracking failure mechanism
After research, surface electricity trace state is effectively assessed, thus examining for mine cable EP rubbers surface electricity trace state
Disconnected and life appraisal provides judgment basis.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of EP rubbers surface electricity trace state feature extractions
Method, it is intended to EP rubbers surface electricity trace state of development is accurately and effectively identified, to use EP rubbers for mine cable insulation
The diagnosis of surface electricity trace state and life appraisal provide judgment basis.
To achieve the above object, the technical solution adopted by the present invention is that providing a kind of mine cable insulation EP rubbers
Surface electricity trace state feature extracting method comprising the mine cable insulation selection of EP rubbers surface electricity trace characteristic quantity and
Extracting method.
The selection of the mine cable insulation EP rubbers surface electricity trace characteristic quantity derives from insulation resistance signal, pole
Change-depolarization current signal and return voltage signal.
The characteristic quantity of the insulation resistance signal includes 6, is defined as follows:
(1) 15s insulation resistanceR 15: the insulating resistance value of sample after pressurization 15s；
(2) 60s insulation resistanceR 60: the insulating resistance value of sample after pressurization 60s；
(3) 600s insulation resistanceR 600: the insulating resistance value of sample after pressurization 600s；
(4) conductivityσ r: dielectric conducts the ability of electric current, circular are as follows:
(5) absorptance K: dielectric is during the charging process to the absorbability of charge, circular are as follows:
(6) polarization index P.I.: dielectric is during the charging process to the polarizability of charge, circular are as follows:
The polarization-depolarization current signal characteristic quantity includes 6, is defined as follows:
(1) polarization current stationary valuei ps: current value when polarization current reaches stable；
(2) polarization current initial slopeS p: initial stage polarization current change rate, circular are as follows:
(3) depolarization current initial valuei dp0: the depolarization current value of initial stage；
(4) depolarization current stationary valuei dps: current value when depolarization current reaches stable；
(5) depolarization current initial slopeS dp: initial stage depolarization current change rate, circular are as follows:
(6) concave point time of occurrencet cp: the inflection point of depolarization current change rate.
The characteristic quantity of the return voltage signal includes 3, is defined as follows:
(1) return voltage maximum valueU rmax: the maximum voltage value in return voltage curve；
(2) centre time constantt cdom: reach required time when return voltage maximum value；
(3) return voltage initial slopeS i: initial stage return voltage curvilinear motion rate, circular are as follows:
The Characteristic Extraction method is temporal signatures amount extracting method, mainly extracts the starting of signal waveform
Point, stable point, initial slope and concave point, wherein the starting point of signal waveform and stable point directly extract after median filtering.
The feature extraction of the signal waveform initial slope, the specific steps are as follows:
(1) median filtering is carried out to the original signal of polarization current, depolarization current and return voltage；
(2) coordinate of waveform initial point coordinate and 1s point is chosen；
(3) initial slope is sought according to two o'clock coordinateS p、S dpWithS i。
The feature extraction of the signal waveform concave point, mainly for depolarization current original signal, the specific steps are as follows:
(1) median filtering is carried out to depolarization current original signal；
(2) coordinate of waveform initial point coordinate and 1s point is chosen, and seeks first slope according to selected coordinateS 1, choosing
The coordinate of waveform 1s point and the coordinate of 2s point are taken, and seeks second point slope according to selected coordinateS 2；
(3) it seeksS 1WithS 2This absolute value is denoted as a by the absolute value of difference1；
(4) step (2) and (3) are repeated, until finding out an-1；
(5) compare a1、a2、a3……an-1Size, maximum value is denoted as am；
(6) a is foundmThe abscissa of corresponding point, as depolarization current concave point time of occurrencet cp。
By the characteristic quantity extracted from three kinds of status signals combine can to borehole cable EP rubbers surface electricity
Trace state is characterized, and the fluctuation of single feature amount will not influence characterization result, can effectively be reflected surface electricity trace state, is
Borehole cable provides judgment basis with the diagnosis of EP rubbers surface electricity trace state and life appraisal.
The beneficial effects of the present invention are: being solved using mine cable insulation EP rubbers surface electricity trace as research object
The characterization problems of its electric trace state of development；It is theoretical by lossless dielectric response, from the volume electricity that can characterize insulating materials characteristic
In resistance, polarization-depolarization current and return voltage information, 15 kinds of specific electric trace characteristic signals are selected altogether, not to insulation
It carries out carrying out electric trace state representation under the premise of secondary damage；The present invention mutually ties three kinds of fault-signals when selecting fault message
The thought of conjunction avoids the problem that status assessment inaccuracy caused by fluctuation occurs in a certain characteristic quantity；And in feature extraction
Selected signal initial slope and concave point go out current moment, sensitive can reflect the surface electricity trace state of EP rubbers.This hair
It is bright to provide reliable characterizing method with EP rubbers surface electricity trace status assessment for mine cable insulation, and can guarantee to assess
As a result accuracy.
Detailed description of the invention
Fig. 1 is the insulation resistance waveform and characteristic quantity of EP rubbers surface electricity trace of the present invention；
Fig. 2 is the polarization current waveform and characteristic quantity of EP rubbers surface electricity trace of the present invention；
Fig. 3 is the depolarization current waveform and characteristic quantity of EP rubbers surface electricity trace of the present invention；
Fig. 4 is the return voltage waveform and characteristic quantity of EP rubbers surface electricity trace of the present invention；
Fig. 5 is tracking test measuring circuit of the present invention；
Fig. 6 is bulk resistor measuring circuit figure of the present invention；
Fig. 7 is PDC measuring circuit figure of the present invention；
Fig. 8 is recovery voltage measurement circuit diagram of the present invention；
Fig. 9 is insulation resistance Characteristic Extraction flow chart of the present invention；
Figure 10 is return voltage Characteristic Extraction flow chart of the present invention；
Figure 11 is polarization of the present invention-depolarization current Characteristic Extraction flow chart.
Specific embodiment
Objects, technical solutions and advantages to facilitate the understanding of the present invention, with reference to the accompanying drawing to specific reality of the invention
The mode of applying makes further instructions.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in and limits the invention.
The present invention is based on this using 10kV borehole cable ethylene propylene rubber insulation material as main study subject, in conjunction with attached drawing
The specific embodiment of the surface electricity trace state feature extracting method of insulation resistance is described in detail.
Borehole cable EP rubbers surface electricity trace artificial defect preparation: using IEC60587 as foundation, due to EP rubbers
Has excellent resistance to electric trace performance, therefore in test, using the stronger cetyl trimethylammonium bromide of moisture pick-up properties as wet
Moisten agent and NH is added4Contaminated liquid, NH are made in Cl4The mass ratio of Cl and cetyl trimethylammonium bromide is 1:1.It is connected according to Fig. 5
Circuit carries out electric trace test at 4.5kV, obtains the sample of different electric trace developing stage, selects four typical samples therein,
I.e. insulation performance it is outstanding, it is good, medium and it is poor carry out based on insulation resistance characteristic signal measurement.
Using the insulation measurement unit in KEITHLEY-6517B, the insulation resistance of EP rubbers electricity trace sample is measured
Signal, measurement circuit are as shown in Figure 6.Specific measurement process are as follows: firstly, it is 10% that the relative humidity of guarantee ambient enviroment is constant, temperature
Degree is 25 DEG C；Then, adjusting measurement voltage is 400V；Finally, measuring the insulation resistance in 1min and 10min respectively.
Using the current measuring unit in KEITHLEY-6517B, the polarization and depolarising of EP rubbers electricity trace sample are measured
Current signal, measurement circuit are as shown in Figure 7.Specific measurement process are as follows: firstly, the sample shorted on both ends that will be measured, it will
Sample is discharged completely, and is calibrated to KEITHLEY-6517B；Then, S is closed to S1, it charges to sample, charging
Time ist c；Finally, S is closed to S by moment after charging2, the measurement of depolarization current is discharged sample and carries out,
Time of measuring ist d.Under normal conditions, the time of measuring of polarization current and depolarization current is identical.
Using the voltage measurement unit in KEITHLEY-6517B, the return voltage letter of EP rubbers electricity trace sample is measured
Number.It is as shown in Figure 8 to measure circuit.Specific measurement process are as follows: firstly, the sample shorted on both ends that will be measured, by sample into
Row electric discharge completely, and 6517B is calibrated；Then, S is closed to S1, to sample charging, the charging time ist c；Then, exist
S is closed to S by the moment after charging2It discharges, discharge time ist d；After discharge time, S is disconnected1And S2, connect
Logical S3, the continuous voltage for measuring sample both ends, the voltage curve measured at this time is return voltage curve.
After all measurements, the coordinate for extracting each curve mark in Fig. 1-4 respectively is mine cable insulation second third
Rubber surface electricity trace characteristic quantity.Polarization-depolarising is extracted according to the characteristic extraction step of the signal waveform initial slope
The initial slope of electric current and return voltage, respectivelyS p、S dpWithS i；According to the characteristic extraction step of the signal waveform inflection point
The concave point for extracting depolarization current goes out current momentt cp.Specific Characteristic Extraction process is as shown in figs. 9-11.
As given fault signature data in following table.By the feature extraction result in table as it can be seen that with insulation performance by
It gradually reduces, absorptanceKAnd polarization indexP.I.There is the result of variations of first increases and then decreases, there are slight deviations.But at this
Can also accurately it reflect under the electricity trace existence of surface in the presence of a little deviations, the insulation status of EP rubbers.
| Characteristic quantity | It is excellent | It is good | In | Difference |
| R 15/1012Ω | 10.428 | 7.0133 | 8.1484 | 5.7225 |
| R 60/1012Ω | 18.206 | 14.661 | 13.015 | 7.4292 |
| R 600/1012Ω | 40.433 | 35.148 | 27.055 | 8.1420 |
| σ r/10-17S | 1.3496 | 1.5525 | 2.0169 | 6.7020 |
| K | 1.7459 | 2.0905 | 1.5972 | 1.2982 |
| P.I. | 2.2209 | 2.3973 | 2.0786 | 1.096 |
| U rmax/V | 5.1410 | 5.3421 | 5.8198 | 6.7751 |
| T cdom/s | 1000 | 378 | 347 | 336 |
| S i | 0.0454 | 0.0584 | 0.0607 | 0.0654 |
| i dpo/A | 3.131×10-10 | 3.5940×10-9 | 4.7850×10-9 | 5.1872×10-9 |
| i dps/A | 9.6×10-11 | 2.9866×10-10 | 3.2628×10-10 | 5.8998×10-10 |
| i ps/A | 1.29×10-10 | 3.39510-9 | 2.99×10-9 | 1.92×10-9 |
| t cp/s | 37 | 54 | 69 | 78 |
| s dp | 2.3085×10-10 | 3.4855×10-10 | 2.6670×10-10 | 2.5380×10-10 |
| s p | 3.921×10-10 | 6.989510-10 | 6.1365×10-10 | 5.3095×10-10 |
Result of implementation shows to combine the characteristic quantity extracted from three kinds of status signals can be to borehole cable second third
The surface electricity trace state of rubber is characterized, and the fluctuation of single feature amount will not influence characterization result, can effectively reflect table
Face electricity trace state provides judgment basis with the diagnosis of EP rubbers surface electricity trace state and life appraisal for borehole cable.
Claims (4)
1. a kind of borehole cable EP rubbers surface electricity trace state feature extracting method is mainly used for reflecting EP rubbers surface
Electric trace state, it is characterised in that: the surface electricity trace state feature extracting method include surface electricity trace characteristic quantity selection and
Extracting method；
The selection of the surface electricity trace characteristic quantity is from insulation resistance signal, polarization-depolarization current signal and replys electricity
Press signal；
The extracting method of the surface electricity trace characteristic quantity is temporal signatures amount extracting method, and the method mainly extracts signal wave
Starting point, stable point, initial slope and the concave point of shape, wherein the starting point of signal waveform and stable point are direct after median filtering
It extracts；
The feature extraction of the signal waveform initial slope, the specific steps are as follows:
(1) median filtering is carried out to the original signal of polarization current, depolarization current and return voltage；
(2) coordinate of waveform initial point coordinate and 1s point is chosen；
(3) initial slope is sought according to two o'clock coordinateS p、S dpWithS i；
The feature extraction of the signal waveform concave point, mainly for depolarization current signal, the specific steps of which are as follows:
(1) median filtering is carried out to depolarization current original signal；
(2) coordinate of waveform initial point coordinate and 1s point is chosen, and seeks first slope according to selected coordinateS 1, choose wave
The coordinate of shape 1s point and the coordinate of 2s point, and second point slope is sought according to selected coordinateS 2；
(3) it seeksS 1WithS 2This absolute value is denoted as a by the absolute value of difference1；
(4) step (2) and (3) are repeated, until finding out an-1；
(5) compare a1、a2、a3……an-1Size, maximum value is denoted as am；
(6) a is foundmThe abscissa of corresponding point, as depolarization current concave point time of occurrencet cp。
2. a kind of borehole cable according to claim 1 EP rubbers surface electricity trace state feature extracting method, special
Sign is: the insulation resistance signal characteristic quantity includes 15s insulation resistanceR 15, 60s insulation resistanceR 60, 600s insulation resistanceR 600, conductivityσ r, absorptanceKAnd polarization indexP.I.。
3. a kind of borehole cable according to claim 1 EP rubbers surface electricity trace state feature extracting method, special
Sign is: the polarization-depolarization current signal characteristic quantity includes polarization current stationary valuei ps, polarization current initial slopeS p、
Depolarization current initial valuei dp0, depolarization current stationary valuei dps, depolarization current initial slopeS dpWith concave point time of occurrencet cp。
4. a kind of borehole cable according to claim 1 EP rubbers surface electricity trace state feature extracting method, special
Sign is: the return voltage signal characteristic quantity includes return voltage maximum valueU rmax, centre time constantt cdomAnd return voltage
Initial slopeS i。
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| CN110057816A (en) * | 2019-03-20 | 2019-07-26 | 天津大学 | The appraisal procedure of insulating materials senile experiment device based on electro thermal coupling field |
| CN111090022A (en) * | 2019-11-25 | 2020-05-01 | 国网山西省电力公司大同供电公司 | TDR-based water seepage defect accurate positioning method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203745585U (en) * | 2014-02-11 | 2014-07-30 | 国家电网公司 | Spray tracking resistance test device |
| WO2015144199A1 (en) * | 2014-03-24 | 2015-10-01 | Prysmian S.P.A. | Method of measuring current distribution in high and medium voltage cables |
| CN105548827A (en) * | 2015-12-04 | 2016-05-04 | 西安交通大学 | Non-destructive method for evaluating aging and operation state of cables |
-
2016
- 2016-07-11 CN CN201610541127.3A patent/CN106199194B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203745585U (en) * | 2014-02-11 | 2014-07-30 | 国家电网公司 | Spray tracking resistance test device |
| WO2015144199A1 (en) * | 2014-03-24 | 2015-10-01 | Prysmian S.P.A. | Method of measuring current distribution in high and medium voltage cables |
| CN105548827A (en) * | 2015-12-04 | 2016-05-04 | 西安交通大学 | Non-destructive method for evaluating aging and operation state of cables |
Non-Patent Citations (2)
| Title |
|---|
| 划痕类微孔对交联聚乙烯-硅橡胶界面电痕破坏的影响;夏岩松 等;《高压电器》;20111231;第47卷(第12期);第109-114页 * |
| 电线电缆耐表面电痕性能的探讨;朱中柱 等;《电线电缆》;19831231(第1期);第1-7页 * |
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