CN105203866B - A kind of High Voltage XLPE Power Cable method for diagnosing faults based on method of loci - Google Patents
A kind of High Voltage XLPE Power Cable method for diagnosing faults based on method of loci Download PDFInfo
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- CN105203866B CN105203866B CN201510422684.9A CN201510422684A CN105203866B CN 105203866 B CN105203866 B CN 105203866B CN 201510422684 A CN201510422684 A CN 201510422684A CN 105203866 B CN105203866 B CN 105203866B
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Abstract
The invention discloses a kind of new methods for the cross interconnected cable on-line fault diagnosis of 110kVXLPE, i.e. method of loci.This method is to build the trajectory diagram that two kinds of parametric synthesis are got up in the same period after being transmitted to computer by on-line monitoring system acquisition cable metal sheath ground wire circulation and working voltage parameter.Any failure all corresponds to different trajectory diagrams, compares the trajectory diagram and difference condition under normal circumstances using digital image processing techniques analysis, accurately to carry out fault diagnosis.Method for diagnosing faults of the present invention can overcome the shortcomings of tradition on-line monitoring and method for diagnosing faults, and accuracy higher, cost is relatively low, real-time diagnosis may be implemented, and can history of forming fault trajectory database.
Description
Technical field
The present invention relates to a kind of on-line fault diagnosis new methods of 110kVXLPE cables, belong to technical field of electric power.
Background technology
Crosslinked polyethylene (XLPE) cable has many advantages, such as that portable construction, excellent electric properties, laying are convenient, in high-voltage electricity
It is applied widely in net.It in Power Cable Running Process, can be influenced by extraneous complex environment, such as electricity, magnetic, heat, change
The effect of the multiple factors such as, machinery is also likely to be present the local defects such as insulative air gap and protrusion in manufacturing process, will promote electricity
The gradual aging of cable insulation, ultimately causes shelf depreciation, and cable major insulation is caused to puncture, and generates earth fault.Cable jacket is exhausted
Edge may mainly have following failure:First, sheath breakage causes cable metal sheath multipoint earthing occur, protective metal shell generates ring
Stream causes loss to generate heat, and causes to insulate hot-spot and accelerates insulation ag(e)ing, seriously affects the major insulation service life；Second is that insulating sheath
Damage causes moisture to invade, and the probability that major insulation generates water-treeing increases, and is seriously affected to cable life generation.
High-tension cable is searched relatively difficult once breaking down.Traditional way is regular progress preventive trial,
This method not only causes loss of outage, expends a large amount of manpower and materials, also there is larger damage to cable, has been difficult to meet society
It is required that.
In recent years, the method for on-line monitoring has obtained certain popularization and application, operations staff in cable insulation detection field
The real-time insulation parameter of cable can be grasped in the case where not having a power failure, to help to judge whether cable insulation goes wrong.
Line monitoring method can realize the transformation from " correction maintenance " to " Predictive Maintenance ", can effectively improve cable power supply reliability, be
The development trend of cable insulation detection from now on.
Such as DC component method, medium consumption factor method, shelf depreciation method, earth pattern are proposed both at home and abroad at present
Equal on-line monitoring methods, although these methods have feasibility in theory for high pressure XLPE, in place of Shortcomings, for example (,) it is high
Under pressure ring border monitoring signals it is too small be difficult to obtain, monitoring device installation is complex and high cost etc., therefore to realize these at the scene
Method also has many difficult.Approved cable fault positioning diagnosticing method has an impedance method and traveling wave method at present simultaneously, but by
The conditions such as use scope and accuracy limit, and do not reach the result of anticipation.
Invention content
It is an object of the invention to overcome the shortcomings of above-mentioned on-line monitoring and method for diagnosing faults, propose that one kind can effectively exist
The new method of the cross interconnected cable faults of radiodiagnosis x XLPE, i.e. method of loci.This method is by acquiring many kinds of parameters of cable simultaneously
The trajectory diagram that it is integrated in the same period is built to judge failure.It is cable operation that this trajectory diagram, which can be regarded,
The fingerprint of situation, any failure can all change this track in a manner of unique.It is used in combination digital image processing techniques to remove analysis ratio
Possible fault type is identified compared with some features of trajectory diagram.
The parameter for acquiring electric current and voltage to the cross interconnected cable normal operation sections of 110kVXLPE first, when taking its identical
Interior electric current and the respective waveform of voltage, and projected current-voltage waveform in another coordinate system according to the corresponding time,
It is Y-axis by voltage projection, electric current projection is X-axis, and the two forms a track, and using this track as initial trace figure.Then
For different faults situation, variation is moved towards come failure judgement type by research track.The cable ginseng acquired in the present invention
Number is circulating current in sheath and circuit working voltage.Simultaneously, it may be considered that the variation of comprehensive monitoring induced voltage and other parameters, more
Accurately judge that fault type.
The key problem in technology of the invention is by the collected ground wire circulation of on-line monitoring system and working voltage parameter, projection
Into the same coordinate system, judge that the type of its failure, difficult point are by digital image processing techniques according to the variation of its track
Study the specific correspondence between failure and trail change.Therefore in order to by trajectory diagram diagnosing cable failure, need first mould
Quasi- different faults carry out data record and Mathematics Research to the variation of moving towards of its trajectory diagram, for the image centroid of image, mainly
With secondary shaft length, eccentricity and rotation angle etc. study the mathematical relationship of failure and these image parameters, establish one
Cable trace database, the foundation as cable fault diagnosis.
Description of the drawings
Fig. 1 is on-line monitoring system frame diagram.
Fig. 2 is method of loci failure judgement schematic diagram.
Specific implementation mode
The invention will be further described with specific implementation process below in conjunction with the accompanying drawings.
Referring to Fig. 1, entire cable insulation on-line monitoring system frame is as shown, each link of system takes modularization to set
Meter, is made of following three parts：Cable metal shield circulating current signal and working voltage acquisition module, signal wireless transmission module,
Remote comprehensive information management system.Wherein, protective metal shell circulation signal and working voltage signal acquisition module include mainly original
Signal acquisition, filter circuit and remote measurement and control terminal.Original signal acquisition module is by current sensor from metal sheath both ends
Ground wire and acquisition circulation signal at sheath crossbonding, working voltage letter is acquired by voltage sensor from each phase of cable
Number, then filter circuit is used to eliminate the high-frequency noise in signal, useful low frequency signal is made to pass through.Signal wireless transmission module
The related data monitored in real time is mainly sent to remote comprehensive management system monitors center.Finally it is responsible for connecing by monitoring center
Receive the collected metal sheath current signal of sensor and working voltage signal.
Referring to Fig. 2, after data acquisition is transmitted to computer, the method use of Correlation method for data processing is newly proposed
Method of loci, i.e., measured the situation of change of relevant parameter within specific a period of time by monitoring device, and obtains corresponding track
Figure.Trajectory diagram in the case of the various failures of simulation (major insulation aging is made moist, and sheath is damaged, sheath multipoint earth faults etc.)
Graphic change situation, which is used as, refers to foundation.According to reference locus figure failure judgement type in actual cable operation.Meanwhile it can be with
By monitoring the variation of induced voltage and other parameters, the type of further comprehensive descision failure.Specific implementation passes through digitized map
As treatment technology is to the barycenter of trace image, main and secondary shaft length, eccentricity and rotation angle are analyzed to obtain
The basis for estimation of fault type, then historical failure data library is coordinated to carry out comprehensive descision to fault type as reference.
Claims (1)
1. a kind of High Voltage XLPE Power Cable method for diagnosing faults based on method of loci, it is characterised in that：It is adopted by on-line monitoring system
Collect cable metal sheath ground wire circulation and working voltage parameter, builds the track that two kinds of parametric synthesis are got up in the same period
Figure；It projects in the same coordinate system, the collected ground wire circulation of on-line monitoring system and working voltage parameter according to its rail
The variation of mark judges the type of its failure by digital image processing techniques, studies specific corresponding between failure and trail change
Relationship；Compare the trajectory diagram and difference condition under normal circumstances using digital image processing techniques analysis, accurately to carry out
Fault diagnosis；In order to by trajectory diagram diagnosing cable failure, need first to simulate different faults to the trend of its trajectory diagram change into
Row data record and Mathematics Research, for the image centroid of image, main and secondary shaft length, eccentricity and rotation angle aspect
Study failure and these image parameters mathematical relationship, establish a cable trace database, as cable fault diagnose according to
According to.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510422684.9A CN105203866B (en) | 2015-07-17 | 2015-07-17 | A kind of High Voltage XLPE Power Cable method for diagnosing faults based on method of loci |
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| CN201510422684.9A CN105203866B (en) | 2015-07-17 | 2015-07-17 | A kind of High Voltage XLPE Power Cable method for diagnosing faults based on method of loci |
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| CN105203866A CN105203866A (en) | 2015-12-30 |
| CN105203866B true CN105203866B (en) | 2018-08-21 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301347B (en) * | 2015-12-09 | 2018-09-21 | 常州赛恩电力科技有限公司 | A kind of high-voltage cable metal sheath circulation monitoring system |
| CN108344917A (en) * | 2017-11-27 | 2018-07-31 | 长沙理工大学 | The cross interconnected cable on-line fault diagnosis method of 110kV crosslinked polyethylenes based on method of loci |
| CN110763957A (en) * | 2018-07-24 | 2020-02-07 | 长沙理工大学 | Novel method for monitoring insulation fault of medium-voltage cable on line |
| CN109884467B (en) * | 2019-03-04 | 2020-06-02 | 国网湖北省电力有限公司电力科学研究院 | Device and method for insulating fault positioning of insulating tubular bus |
| CN112147457A (en) * | 2019-06-26 | 2020-12-29 | 国网江苏省电力有限公司南京供电分公司 | Underground comprehensive pipe gallery cable fault detection and positioning system and method based on Hilbert-Huang transform |
| CN111965565A (en) * | 2020-08-25 | 2020-11-20 | 广东电网有限责任公司广州供电局 | Cable line fault reason judgment method, device, equipment and medium |
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| CN101825657B (en) * | 2010-05-12 | 2012-07-04 | 国网电力科学研究院 | Medium-high voltage single-core crosslinked cable induction voltage and circular-current online detection method and device |
| TW201432279A (en) * | 2013-02-05 | 2014-08-16 | Tzu-Feng Wanglee | Method of utilizing vocal features for determining malfunctions of electrical equipment caused by arc discharge, mechanical vibration and abnormal displacement |
| CN203299337U (en) * | 2013-06-24 | 2013-11-20 | 长沙理工大学 | High voltage XLPE cable insulation on-line monitoring device |
| CN203535128U (en) * | 2013-07-25 | 2014-04-09 | 广西电网公司南宁供电局 | Crosslinked polyethylene high-voltage cable on-line monitoring and early warning system |
| CN103529272B (en) * | 2013-10-18 | 2016-09-14 | 国网上海市电力公司 | A kind of high tension cable shield circulating current Forecasting Methodology |
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