CN108828398A - A kind of single-core cable partial discharge location method based on structural similarity algorithm - Google Patents
A kind of single-core cable partial discharge location method based on structural similarity algorithm Download PDFInfo
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- CN108828398A CN108828398A CN201810198075.3A CN201810198075A CN108828398A CN 108828398 A CN108828398 A CN 108828398A CN 201810198075 A CN201810198075 A CN 201810198075A CN 108828398 A CN108828398 A CN 108828398A
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- cable
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- partial discharge
- algorithm
- structural similarity
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Testing Relating To Insulation (AREA)
- Locating Faults (AREA)
Abstract
The single-core cable partial discharge location method based on structural similarity algorithm that the invention discloses a kind of improves cable partial discharge setting accuracy based on structural similarity algorithm, and then improve the stability of transmission line of electricity for the insulation fault that power cable line often occurs.The localization method mainly includes the following steps that：First by determined off-line, related experiment parameter is measured to the cable of a certain specific model；Secondly by the HF current transformer real-time monitoring PD signal of the metallic shield grounding end installation at cable connector, and pass control centre's analysis back；The similarity that both ends pulse signal is finally compared using SSIM algorithm, realizes the accurate positioning to the source PD.This method can not only complete the positioning of the source PD online, and to close to the source PD of cable connector and terminal also can effective position, the error of test result provides reliable protection act foundation in 1m, for subsequent Fault Control, removing.
Description
Technical field
The single-core cable partial discharge location method based on structural similarity algorithm that the present invention relates to a kind of, belong to electric system after
Electric protection technical field.
Background technique
With the continuous development of modern power network, transmission line of electricity is increasingly taken seriously as a wherein important ring, crosslinking
Polyethylene (XLPE) power cable is widely used with excellent electrical insulation properties in smart grid, power plant, aircraft, rail
In the systems such as road traffic and large ship, and its operation conditions, insulation performance are directly related to the stable operation of whole system.
According to the design of power cable, the service life is but higher in the incipient failure rate to put into operation generally between 15-20, the reason is that electric
Insulation defect present in cable itself and attachment easily causes shelf depreciation (PD), especially in urban distribution network, because cable is long-term
Direct-burried underground is influenced by temperature, water, organic compound, acid, alkali and microorganism etc., accelerates the development of shelf depreciation in insulating layer
Process gradually forms electric branch and finally induces permanent fault, causes the stoppage in transit of entire local system even out of control.To reduce electricity
The failure rate of cable, the source prelocalization PD, which occurs, in permanent fault is particularly important.
Localization method common at present：Amplitude frequency diagram method (AF), the PD signal acquired by different location, through time domain and
Frequency-domain analysis, which calculates, realizes positioning, but because fuzzy positioning result this method is only capable of as predicting means；Phase difference method, according to
The phase difference of incidence wave and back wave in a frequency domain realizes positioning, and this method can not for the source PD of close cable connector or terminal
Positioning.
Present invention aims to overcome that the deficiency of traditional partial discharge location method, propose a kind of based on structural similarity algorithm
Single-core cable partial discharge location method.The PD signal of metal sheath at this method real-time monitoring cable connector, and data analysis is carried out,
The similarity of route both ends pulse signal is compared using SSIM algorithm, realizes the accurate positioning to the source PD, is subsequent failure control
System removes the reliable protection act foundation of offer.
The technical scheme adopted by the invention is that：It is measured by cable of the determined off-line to a certain specific model related real
Parameter is tested, is laid the groundwork for subsequent analysis calculating；Again by being mounted on the HF current transformer at joint metallic shield grounding end
The PD signal that real-time monitoring is likely to occur, and pass the SSIM value of control centre's analytical calculation pulse signal back, it is set when the value is greater than
When the threshold value set, it is judged as external source, otherwise is inside sources；Finally in the case where being determined as inside sources, using SSIM algorithm
Compare the accurate positioning for carrying out partial discharge source.
Detailed description of the invention
Attached drawing 1 is power cable equivalent model
Attached drawing 2 is the source the PD positioning flow figure based on SSIM algorithm
Specific embodiment
The invention will be further described with specific implementation process with reference to the accompanying drawing.
Referring first to Fig. 1, when the source PD is arranged inside cable 1, it is specified that the source PD belongs to outside relative to cable connector 1 and 2
Portion source belongs to inside sources relative to cable connector 1 and 3.Metallic shield grounding end at each cable connector is installed by high-frequency electrical
Current transformer, real-time monitoring PD pulse signal.L is the length of an economize on electricity cable in figure, and U is the partial discharge voltage letter for flowing through cable connector
Number, I is the current signal of cable connector grounding point, IRSFor the modular transformation value of cable connector grounding point electric current.
Referring to fig. 2, a kind of single-core cable partial discharge location method based on structural similarity algorithm of the present invention includes
Following steps：
(1) determined off-line transfer function A, material calculation Δ t, the unit length L of cablemin, the experiments such as propagation delay τ ginseng
Number, and choose suitable data window (DataWindows, DW)
DW=min { DW1,DW2}
Whereinτ in formulaCAnd τSRespectively core and gold
Belong to the propagation delay under sheath both modalities which；
(2) by the PD signal of the outer metal sheath of each connector of HF current transformer real-time monitoring, it is with 2 section of cable
Example, the first pulse signal that connector 1 and connector 2 are monitored is respectively I through signal processingRS1And I2·m, then by IRS1WithPhase
Curve waveform x and I after multiplying2·mCurve waveform y compared to pair, the similarity numerical value SSIM that both is obtained using SSIM algorithm (x,
Y), which is compared with the threshold value 1 of setting, is then determined as external source if more than threshold value 1, it is on the contrary then be inside
Source.For the transfer function of cable core, threshold value 1 is arranged between 0.7-0.9.Calculation formula is as follows：
Wherein μx、μyIt is the average brightness of two images signal respectively,The respectively mark of picture signal x and y
Poor, the σ of standardxyIt is the covariance of x, y, c1、c2、c3It is the constant for making denominator is not zero in formula very little, α, β, γ are the corresponding factors
Weight.SSIM algorithm the result is that bounded：0 < SSIM (x, y)≤1, as a result bigger, the similarity of two width figures is higher, when
When two width figure striking resemblances, SSIM (x, y)=1.
(3) it when being determined as inside sources, needs to further determine that the position in the source PD, is arranged in 1 section of cable with the source PD, it is false
If having a computational length l, numerical value L apart from connector 1minIntegral multiple.The pulse signal that connector 1 and connector 2 are monitored passes through
Signal processing obtains I1·mAnd I3·m, then by I1·mWithCurve waveform x' and I after multiplication3·mWithCurve waveform after multiplication
Y' obtains the similarity numerical value SSIM (x', y') of the two using SSIM algorithm, by 2 phase of threshold value of the numerical value and setting compared to
Compare, it then can be using the corresponding position of similarity numerical value as a reference result if more than threshold value 2.If it is less than threshold value 2, then
By l compared with L, if l is greater than L, overall merit reference result is carried out, taking the corresponding position of SSIM (x', y') maximum value is PD
Source.If l is less than L, assignment l is judged again.
Claims (2)
1. a kind of single-core cable partial discharge location method based on structural similarity algorithm, it is characterised in that：First by surveying offline
It is fixed, relevant parameter is measured to the cable of a certain specific model；Secondly by the metallic shield grounding end peace at cable connector
The real-time PD signal of the HF current transformer of dress, and pass control centre's analysis back；Finally both ends pulse is compared using SSIM algorithm
The similarity of signal realizes the accurate positioning to the source PD.This method can not only complete the positioning of the source PD online, and connect to close to cable
Head and terminal the source PD also can effective position, the error of test result in 1m, for subsequent Fault Control, remove provide reliably
Protection act foundation.
2. a kind of according to claim 1, single-core cable partial discharge location method based on structural similarity algorithm, this method uses mould
Blockization design, is mainly made of following three parts：Determined off-line module, Primary Location module and pinpoint module.Wherein from
It is to measure related experiment parameter to the cable of a certain specific model that line, which measures module, is laid the groundwork for subsequent analysis calculating；Tentatively
Locating module is believed by being mounted on the PD that the HF current transformer real-time monitoring at joint metallic shield grounding end is likely to occur
Number, and pass the SSIM value of control centre's analytical calculation pulse signal back, when the value is greater than the threshold value of setting, it is judged as external
Source, on the contrary it is inside sources；In the case where being determined as inside sources, reapplies SSIM algorithm and compare the accurate fixed of progress partial discharge source
Position.
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| CN201810198075.3A CN108828398B (en) | 2018-03-09 | 2018-03-09 | Single-core cable partial discharge positioning method based on structural similarity algorithm |
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| CN201810198075.3A CN108828398B (en) | 2018-03-09 | 2018-03-09 | Single-core cable partial discharge positioning method based on structural similarity algorithm |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112540269A (en) * | 2020-12-04 | 2021-03-23 | 广东电网有限责任公司 | Method for improving local discharge positioning accuracy of distribution cable |
| CN113759224A (en) * | 2021-11-08 | 2021-12-07 | 广东电网有限责任公司惠州供电局 | Cable terminal head discharge sensing measurement and control circuit, device and cable distribution box |
| CN114065825A (en) * | 2022-01-17 | 2022-02-18 | 北京航空航天大学杭州创新研究院 | Brain magnetic MEG source positioning method based on structural similarity |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221665A (en) * | 2011-03-21 | 2011-10-19 | 江苏省电力公司无锡供电公司 | Power cable partial discharge detection contrast method |
| WO2016156875A1 (en) * | 2015-04-01 | 2016-10-06 | High Voltage Partial Discharge Limited | Apparatus and method for monitoring partial discharge |
| CN106353648A (en) * | 2016-08-30 | 2017-01-25 | 浙江新图维电子科技有限公司 | Comprehensive partial discharge monitoring device and method |
| CN206038828U (en) * | 2016-08-30 | 2017-03-22 | 浙江新图维电子科技有限公司 | Monitoring devices is put in combined office |
| CN106526440A (en) * | 2016-12-29 | 2017-03-22 | 重庆奥海辉龙大数据有限公司 | Cable partial discharge monitoring system and method |
-
2018
- 2018-03-09 CN CN201810198075.3A patent/CN108828398B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221665A (en) * | 2011-03-21 | 2011-10-19 | 江苏省电力公司无锡供电公司 | Power cable partial discharge detection contrast method |
| WO2016156875A1 (en) * | 2015-04-01 | 2016-10-06 | High Voltage Partial Discharge Limited | Apparatus and method for monitoring partial discharge |
| CN106353648A (en) * | 2016-08-30 | 2017-01-25 | 浙江新图维电子科技有限公司 | Comprehensive partial discharge monitoring device and method |
| CN206038828U (en) * | 2016-08-30 | 2017-03-22 | 浙江新图维电子科技有限公司 | Monitoring devices is put in combined office |
| CN106526440A (en) * | 2016-12-29 | 2017-03-22 | 重庆奥海辉龙大数据有限公司 | Cable partial discharge monitoring system and method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112540269A (en) * | 2020-12-04 | 2021-03-23 | 广东电网有限责任公司 | Method for improving local discharge positioning accuracy of distribution cable |
| CN113759224A (en) * | 2021-11-08 | 2021-12-07 | 广东电网有限责任公司惠州供电局 | Cable terminal head discharge sensing measurement and control circuit, device and cable distribution box |
| CN113759224B (en) * | 2021-11-08 | 2022-03-22 | 广东电网有限责任公司惠州供电局 | Cable terminal head discharge sensing measurement and control circuit, device and cable distribution box |
| CN114065825A (en) * | 2022-01-17 | 2022-02-18 | 北京航空航天大学杭州创新研究院 | Brain magnetic MEG source positioning method based on structural similarity |
| CN114065825B (en) * | 2022-01-17 | 2022-04-19 | 北京航空航天大学杭州创新研究院 | Brain magnetic MEG source positioning method based on structural similarity |
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| CN108828398B (en) | 2020-11-06 |
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