CN105137283B - A kind of cable operating status diagnostic system - Google Patents
A kind of cable operating status diagnostic system Download PDFInfo
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- CN105137283B CN105137283B CN201510519072.1A CN201510519072A CN105137283B CN 105137283 B CN105137283 B CN 105137283B CN 201510519072 A CN201510519072 A CN 201510519072A CN 105137283 B CN105137283 B CN 105137283B
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Abstract
The invention discloses a kind of cable operating status diagnostic systems, belong to electrical system technical field, existing diagnostic instrments cannot realize that the quick positioning after permanent fault occurs for cable overall operation status assessment, cable part latency defect location and cable simultaneously, the diagnostic system of offer provided by the invention, it include: cable initial characteristic parameter management module, cable resistance spectrometry module, impedance spectrum Data Analysis Services module, cable operating status diagnostic module, above-mentioned function is realized simultaneously, provides a kind of reliable diagnostic instrments.
Description
Technical field
The invention belongs to electrical system fields, more particularly, to a kind of cable operating status diagnostic system.
Background technique
Cable plays an important role in electric energy and the communication signal transmission of modern large electrical system.In operation
Cable easily occur permanent fault, cable fault will lead to large electrical system and stop transport even out of control, cause tight once occur
The economic loss and social influence of weight.
Power cable layer in power supply system is embedded in underground in cable duct or directly, lays environment and use state
It will greatly affect cable life.Power cable is run under different soils, moisture, moisture, temperature environment for a long time, insulation vulnerable to
The local ageing that insulate occurs to corrosion penetration；Insulation breakdown can often occur because of mechanical external force for underground power cable, finally lead
Send a telegraph cable permanent fault.According to investigations, the insulation damages accident of high-voltage power insulation cable accounts for about high voltage electric equipment accident
40% or so.
The large electrics traffic system such as aircraft, rail traffic, naval vessel proposes the safe operation of cable more stringent
It is required that cable serves as electric energy and controls the leading role of signal transmission in these electrical systems.In July, 1996, due to
Aircraft Cables hot-spot aging generate electric spark lead to fuel tank explosion so that 230 passengers on a frame Boeing-747 aircraft without
One survives.
It is shorter there are a large amount of length and the higher cable of voltage class, the generation of Nuclear Power Accident often start from nuclear power station
The nuclear leakage of part, cable its organic polymer structure under high dose nuclear radiation will go to pot and quick aging occur, will lead
It causes cable fault and makes out of hand with reactor, finally will lead to nuclear power station serious accident.
As it can be seen that realizing that the diagnostic significance of cable operating status is great, the diagnosis of cable operating status includes that cable is integrally transported
Quick positioning after permanent fault, existing instrument occur for row status assessment, cable part latency defect location and cable
Device cannot still realize above-mentioned function simultaneously, especially for the positioning of cable latency defect, still lack very reliable diagnosis
Instrument.
Summary of the invention
Aiming at the problems existing in the prior art, provided by the present application to be a kind of cable operating status diagnostic system and its examine
Disconnected method, wherein by being ground to its key component cable resistance spectrometry module, impedance spectrum Data Analysis Services module
Study carefully and be related to, provides a kind of reliable diagnostic instrments.
To achieve the above object, according to one aspect of the present invention, a kind of cable operating status diagnostic system is provided,
It is characterized in that, which includes:
Cable initial characteristic parameter management module, realizes the management of all kinds of cable initial characteristic parameter databases, and passes through
It inputs tested cable geometric parameter and insulating materials dielectric function calculates cable initial characteristic parameter；
Cable resistance spectrometry module automatically selects measurement frequency range according to subject cable length, by subject electricity
Low-voltage variable frequency sine signal source is inputted between core and ground wire, measurement is tested sample input impedance curve varying with frequency,
Obtain cable resistance spectrum；
Impedance spectrum Data Analysis Services module carries out data analysis to the cable resistance modal data surveyed, to extract cable
Electric parameter relevant information；
Cable operating status diagnostic module realizes that cable is whole using the processing result of impedance spectrum Data Analysis Services module
The function that running body status assessment, the positioning of cable local defect and cable permanent fault position, provides cable operating status
Comments and cable maintenance are suggested.
Preferably, the parameter includes characteristic impedance, propagation coefficient, cable wideband impedance spectrum.
Preferably, the impedance modal data analysis is calculated using intelligent optimization searching algorithm and generalized orthogonal integral transformation
Method.
In general, above-mentioned technical concept according to the invention compared with prior art, it is excellent mainly to have technology below
Point:
1, a kind of reliable diagnostic instrments are provided, while it is locally latent to realize cable overall operation status assessment, cable
Quick positioning after permanent fault occurs for volt property defect location and cable；
2, input impedance varying with frequency curve (i.e. wideband impedance of the measurement cable head within the scope of certain frequency
Spectrum), surveyed impedance spectrum is analyzed by intelligent analysis process, realizes that the assessment of cable entirety ageing state, cable part latency lack
Fall into diagnosis and cable permanent fault fast positioning function.
Detailed description of the invention
Fig. 1 is chief component of the invention；
Fig. 2 is each functions of modules block diagram of the present invention；
Fig. 3 is that cable entirety ageing state assesses curve in the embodiment of the present invention；
Fig. 4 is that local defect diagnoses curve in the embodiment of the present invention；
Fig. 5 is cable fault auditory localization cues in the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Fig. 2 is each functions of modules block diagram of the present invention；
(1) cable initial characteristic parameter management module
Cable initial characteristic parameter is the key parameter in the diagnosis of cable operating status, needs to obtain in advance, and the module is logical
It crosses the tested cable geometric parameter of input and insulating materials dielectric function calculates cable initial characteristic parameter (characteristic impedance, propagation system
Number), cable geometric parameter is obtained by measurement, and cable insulation material dielectric function then passes through interception SI semi-insulation sample and utilizes net
Network analyzer measures acquisition and input database in advance, which realizes the pipe of all kinds of cable insulation material dielectric parameters
The management of reason and all kinds of cable initial characteristic parameters.
(2) cable resistance spectrometry module
The module according to subject cable length automatically select measurement frequency range, by subject cable core and ground wire it
Between input low-voltage variable frequency sine voltage signal source, measure current signal, calculate cable input impedance curve varying with frequency, obtain
Obtain cable resistance spectrum.Module measurement frequency range lower limit flowAnd upper frequency limit fupIt is determined by following formula:
(1)
Wherein r=e-2αl, it is the real part of propagation coefficient, it is initially special that propagation coefficient then passes through cable that α, which is cable attenuation coefficient,
Property parameter management module obtain, l is cable length, and by cable operation management, department is obtained.
(3) impedance spectrum Data Analysis Services module
The module carries out data analysis to the cable resistance modal data surveyed, and extracts cable electrical parameter relevant information, calculates
Method mainly includes intelligent optimization searching algorithm and generalized orthogonal integral transformation algorithm.
The basic principle of intelligent optimization searching algorithm are as follows: within the scope of certain frequency, impedance spectrum is that cable properties parameter is (special
Levy impedance Z0, propagation coefficient γ) function cause characterisitic parameter to change when cable operating status changes, to make
Impedance spectrum changes.Intelligent optimization searching algorithm solves cable properties parameter by counter from surveyed impedance spectrum, further benefit
With characterisitic parameter can computational representation cable insulation status dielectric loss tan δ, to assess cable overall operation state.Cable
The relational expression of dielectric loss and characterisitic parameter are as follows:
The basic principle of generalized orthogonal integral transformation algorithm are as follows: generalized orthogonal integral transformation is carried out to surveyed impedance spectrum, is made
Integral transformation value be in intact place in local defect or failure and significant difference occurs, realize cable part latency defect or former
The positioning of barrier.Generalized orthogonal integral transformation algorithm is described with following formula in the present invention:
Wherein, F (x) is integral transformation function, and Z (f) surveys impedance spectrum by cable resistance spectrometry module, at the beginning of γ is cable
The cable distribution coefficient that beginning characterisitic parameter management module obtains, ldFor cable local defect or abort situation.Work as x=ldWhen, with x
≠ldShi Shangshu product integral value a and b is widely different.By cable occur local defect after impedance spectrum integral transformation function with it is complete
Integral transformation function under good state compares the difference that can further highlight defective section Yu intact part, defined function VA
(x) are as follows:
Wherein, FdIt (x) is the cable resistance spectral integral transforming function transformation function after generation local defect, FhIt (x) is intact cable same
Impedance spectrum integral transformation function under one load, VA (x) is referred to as integral transformation diagnosis function, characterizes cable distribution coefficient with position
The case where setting variation.Under normal circumstances cable everywhere propagation coefficient be it is equal, do not change with position, therefore, if VA (x)
Show that the propagation coefficient at cable different location is identical when being constantly equal to 1.0, i.e., cable is in serviceable condition, does not go out current situation in cable
Portion's defect or failure.
(4) cable operating status diagnostic module
The module utilizes impedance spectrum Data Analysis Services resume module as a result, drawing cable overall dielectric damage curve, comments
Estimate cable entirety ageing state.Diagnosis function VA (x) image is drawn, realizes the positioning of cable local defect or cable permanent fault
Positioning, provides cable operating status comments and cable maintenance is suggested.
Embodiment
To keep the contents of the present invention relatively sharp intuitive, respectively to three twisted polyethylene cables (respectively number be A, B,
C whole ageing state assessment, local defect positioning and permanent fault location test) are implemented respectively.Test specimen is allusion quotation
Type coaxial configuration, core wire radius rcIt is 9.6mm, outer conductor radius r for 6.3mm, insulation thickness asFor 15.8mm.
Cable A length be 20m, entirely through thermal-electrical aging case at 135 DEG C aging 240h.Cable B length is 50m, point
Part is not heated 240 hours at 135 DEG C at 20m and 35m, each to form 1cm long local ageing section.Cable C length is 60m,
Short trouble is set at 30m.
Fig. 3 show the cable A overall dielectric loss frequency spectrum obtained in the embodiment of the present invention, normal twisted polyethylene cable
Insulative dielectric is lost 10-3The order of magnitude becomes 10 by dielectric loss after heating accelerated ageing in 240 hours at 135 DEG C-2Quantity
Grade, belongs to slight ageing state.
Fig. 4 is the cable B local defect auditory localization cues obtained in the embodiment of the present invention, and curve occurs two at 20m and 35
A oscillation peak shows that electric parameter changes at this.Therefore, part at the two of curve energy reliable location cable B is diagnosed to lack
It falls into.
Fig. 5 is the cable C fault location curve obtained in the embodiment of the present invention, and significant peak value occurs at 30m in curve, fixed
Fault point of the position at this.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (2)
1. a kind of cable operating status diagnostic system, which is characterized in that the system includes:
Cable initial characteristic parameter management module, realizes the management of all kinds of cable initial characteristic parameter databases, and passes through input
Tested cable geometric parameter and insulating materials dielectric function calculate cable initial characteristic parameter；
Cable resistance spectrometry module automatically selects measurement frequency range according to subject cable length, by subject cable core
Low-voltage variable frequency sine signal source is inputted between line and ground wire, measurement subject sample input impedance curve varying with frequency obtains
Cable resistance spectrum；
Impedance spectrum Data Analysis Services module carries out data analysis to the cable resistance modal data surveyed, to extract cable electrical
Parameter relevant information；
Cable operating status diagnostic module realizes that cable is integrally transported using the processing result of impedance spectrum Data Analysis Services module
The function that row status assessment, the positioning of cable local defect and cable permanent fault position, provides the assessment of cable operating status
Opinion and cable maintenance are suggested；
Wherein, the impedance spectrum data analysing method uses intelligent optimization searching algorithm and generalized orthogonal integral transformation algorithm,
Specific processing step is as follows:
It is counter from surveyed impedance spectrum to solve cable properties parameter, utilization level parameter can computational representation cable insulation status dielectric
Tan δ, the relational expression of cable dielectric loss and characterisitic parameter is lost are as follows:
In formula, Z0 is characterized impedance, γ is propagation coefficient；
Generalized orthogonal integral transformation is carried out to surveyed impedance spectrum, generalized orthogonal integral transformation algorithm is expressed as follows:
Wherein, F (x) is integral transformation function, and Z (f) surveys impedance spectrum by cable resistance spectrometry module, and γ is that cable is initially special
Property parameter management module obtain cable distribution coefficient, ldFor cable local defect or abort situation, l is cable length；
Impedance spectrum integral transformation function after cable to that local defect occur and the integral transformation function under serviceable condition carry out pair
Than for highlighting the difference of defective section Yu intact part, defining integration transforming function transformation function VA (x) are as follows:
Wherein, FdIt (x) is the cable resistance spectral integral transforming function transformation function after generation local defect, FhIt (x) is intact cable same negative
Impedance spectrum integral transformation function under carrying characterizes the case where cable distribution coefficient is with change in location；
If VA (x) shows that the propagation coefficient at cable different location is identical when being constantly equal to 1.0, i.e., cable is in serviceable condition.
2. the system as claimed in claim 1, which is characterized in that the cable initial characteristic parameter includes characteristic impedance, propagates
Coefficient and cable wideband impedance spectrum.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105699843A (en) * | 2016-02-04 | 2016-06-22 | 华中科技大学 | Electric cable running state diagnosis method and system |
| CN107015102B (en) * | 2017-05-12 | 2019-04-23 | 武汉中直电气股份有限公司 | The distance measuring method and system of a kind of direct current rail transportation power supply line short trouble |
| CN109814005A (en) * | 2017-11-20 | 2019-05-28 | 云南电网有限责任公司玉溪供电局 | A kind of cable insulation defect recognition and localization method and system |
| CN109342883A (en) * | 2018-11-08 | 2019-02-15 | 国网天津市电力公司 | A kind of local ageing fault detecting and positioning method for cable |
| CN110286303A (en) * | 2019-07-10 | 2019-09-27 | 国家电网有限公司 | A kind of coaxial cable insulation cable ageing state appraisal procedure based on BP neural network |
| CN112881804B (en) * | 2021-01-18 | 2023-08-15 | 国网浙江省电力有限公司电力科学研究院 | Impedance spectrum measurement method and device for three-core cable |
| CN113156262B (en) * | 2021-03-17 | 2022-05-31 | 华中科技大学 | High-voltage cable fault positioning method and system based on impedance spectrum |
| CN113075501B (en) * | 2021-03-26 | 2021-12-17 | 华中科技大学 | Cable fault positioning method and system based on impedance spectrum periodic characteristics |
| CN113253046B (en) * | 2021-04-14 | 2022-07-26 | 国网江苏省电力有限公司淮安供电分公司 | Cable water tree fault positioning method based on impedance spectroscopy technology |
| CN116047228A (en) * | 2023-04-03 | 2023-05-02 | 国网江西省电力有限公司电力科学研究院 | Positioning system and method for nondestructive identification of copper-aluminum connector of cable |
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| US7983161B2 (en) * | 2009-05-20 | 2011-07-19 | Accenture Global Services Limited | Control management of voice-over-IP parameters |
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