CN106770665B - A kind of grounded screen imaging method based on transient electromagnetic method - Google Patents
A kind of grounded screen imaging method based on transient electromagnetic method Download PDFInfo
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- CN106770665B CN106770665B CN201611059444.8A CN201611059444A CN106770665B CN 106770665 B CN106770665 B CN 106770665B CN 201611059444 A CN201611059444 A CN 201611059444A CN 106770665 B CN106770665 B CN 106770665B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02863—Electric or magnetic parameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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Abstract
A kind of grounded screen imaging method based on transient electromagnetic method, transient current is generated using the transient excitation source forcing transmitting coil of transient electromagnetic method detection, transient current inspires Primary field, Primary field is sent directionally to the region that grounded screen is covered in underground by transmitting coil, Primary field is in underground propagation, grounded screen generates induced current under the excitation of Primary field, meanwhile, induced current inspires secondary magnetic field.In addition to motivating the lower secondary magnetic field and the variation relation of time generated using Primary field, determine that the Electrical distribution structure and spatial shape of sub-surface conductors, the induced current of grounded screen generate electromagnetic force under the collective effect of Primary field and secondary magnetic field.The present invention analyzes the ultrasonic signal data received using ultrasonic reception array received to ultrasonic signal using transient electromagnetic method excitation source excitation sound field, and the structure of grounded screen is rebuild in the variation of acoustic impedance when being propagated in grounded screen by ultrasonic signal.The high-resolution detection of an ultra shallow layer grounded screen can be achieved in the present invention.
Description
Technical field
The present invention relates to a kind of the ground connection network method based on transient electromagnetic method, in particular to a kind of an ultra shallow layer grounded screen imaging
Method.
Background technique
Grounded screen is the important component in electric system, grounded screen it is intact whether to the safety and stability of electric system
Property is most important, and since the conductor of grounded screen is embedded in underground, grounding grids are directly contacted with soil, over time, will cause
The heavy corrosion of grounded screen.In addition, can all cause grounded screen under the solder skip, rosin joint and natural external force in work progress act on
It is not intact with damage, cause grounded screen lets out current capacity reduction, influences the security and stability of electric system, endangers person peace
Entirely, huge economic loss is caused, therefore finds electric system grounded screen breakage in advance, releases security risk as early as possible to Guan Chong
It wants.
At present for the detection of grounded screen, Grounding can only be judged indirectly by measuring grounded screen electric parameter
Can, rough fault point is measured, and the specifying informations such as extent of corrosion can not be obtained, it can only be excavated by large area and search grounded screen
Conductor breakpoint and corrosion section.Fault Diagnosis for Grounding Grids method mainly has Electrical network analysis method, electromagnetic field analysis method and electrification at present
Method etc..Electrical network analysis method is to regard grounded screen as resistor network, establishes the corrosion diagnosis equation of grounded screen, passes through solution
Resistance change differentiates the corrosion condition of grounded screen；Electromagnetic field analysis method is by measuring to grounded screen Injection Current
Grounded screen earth's surface Distribution of Magnetic Field, to diagnose the extent of corrosion of grounded screen.
For Electrical network analysis method, grounded screen local corrosion or fracture when surface potential difference vary less, grounded screen node
Between resistance value there is no significant change, be difficult accurately to be sentenced by parameters such as external ground resistance, Potential distribution, contact potentials
It is disconnected.Electromagnetic field analysis method influences the accuracy of measurement vulnerable to external interference, and then influences the judgement of extent of corrosion.The above method
Mainly for the grounded screen of small-scale simple structure, there is larger difficulty when the grounded screen for large-scale complex structure, and
Resistivity image can not be obtained, it is difficult to realize qualitative assessment and the accurate positioning of failure.And traditional electrochemical measuring method
It is difficult to accurately measure earth mat corrosion of metal state.
It, can be quickly in the case where avoiding excavating does not influence electric system normal safe operation in grounded screen and detection process
Accurately test electric parameter relevant to grounded screen, obtains grounded screen range underground medium structure distribution situation, and carry out height
It is particularly significant can accurately to obtain grounded screen state distribution situation for resolution imaging.
Imaging method and system is detected about grounded screen at present, University Of Chongqing has carried out the anti-imaging method of grounded screen electric resistance
Electric current injection mode in electrical impedance imaging measuring principle, circulation measurement method are used for corrosion diagnosis of grounding grid by research.The party
Method provides a completely new thinking for the fault diagnosis of grounded screen, i.e., is intuitively judged by direct imaging.But at it
This method is mentioned in pertinent literature at present can judge the general area of grounding grids corrosion, can't accurately determine corrosion
Specific location can not determine the extent of corrosion of branch, also need to be further improved.
In current document, have scholar explore by geophysical exploration be imaged in transient electromagnetic method method be used for grounded screen
Detection, transient electromagnetic method belong to time domain electromagnetic method, the lower secondary magnetic field generated of research Primary field excitation and the variation of time
Relationship, so that it is determined that the Electrical distribution structure and spatial shape of sub-surface conductors.The it is proposed of transient electromagnetic method is mainly used in oil gas
All various aspects such as exploration, mineral exploration, engineering investigation, environmental survey, archaeology detection, military detection.Electric system grounded screen one
As buried depth it is shallower, belong to an ultra shallow Layer Detection, since traditional transient electromagnetic method need to study the early sign of transient electromagnetic signal,
It is very high along requiring to the shutdown of transmitting signal when carrying out shallow-layer detection, the problem of primary field is separated with secondary field difficulty is existed simultaneously,
It was verified that traditional transient electromagnetic method and incompetent shallow-layer detects, at the same transient electromagnetic method for geophysical exploration to point
The requirement of resolution wants low more than grounded screen imaging.
Summary of the invention
The purpose of the present invention is making up the deficiency of existing grounded screen diagnostic method, a kind of connecing based on transient electromagnetic method is proposed
Earth mat imaging method.The present invention utilizes ultrasonic signal an ultra shallow layer high-resolution imaging feature, can be in the feelings do not excavated, do not had a power failure
Fast and accurately fault diagnosis is carried out to grounded screen under condition, obtains the information of grounded screen and ambient substance structure, realizes an ultra shallow layer
The high-resolution imaging of grounded screen.
The method of the present invention uses transient excitation source forcing, and transient excitation generates Primary field in transmitting coil.Using hair
The region for being emitted to underground and covering grounded screen that ray circle orients Primary field.Grounded screen generates under the excitation of Primary field
Induced current, while induced current inspires secondary magnetic field.In addition to using Primary field motivate the lower secondary magnetic field generated and when
Between variation relation, determine the Electrical distribution structure and spatial shape of sub-surface conductors, the induced current in grounded screen is in a magnetic
Electromagnetic force is generated under the collective effect of field and secondary magnetic field, inspires ultrasound.Ultrasonic signal is carried out using ultrasonic reception array
It receives, the variation of acoustic impedance when being propagated in grounded screen by ultrasonic signal is analyzed and processed the signal received, rebuilds
The structure of grounded screen and surrounding medium.
As can be seen from the above technical solutions, compared with prior art, the present invention is based on the imagings of the grounded screen of transient electromagnetic method
Method, this method do not excavate do not have a power failure in the case where realize that underground an ultra shallow layer grounded screen and surrounding medium structural images are rebuild.
Detailed description of the invention
The present invention is based on the grounded screen imaging method schematic diagrames of transient electromagnetic method by Fig. 1.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
The present invention is based on the grounded screen imaging method schematic diagram of transient electromagnetic method as shown in Figure 1, the present invention is swashed using transition
Source forcing is encouraged, underground is emitted to for what Primary field oriented using transmitting coil.Electromagnetic signal generates vortex through underground grounded screen
Secondary magnetic field is excited, by receiving surface em signal, through data processing and image reconstruction, rebuilds underground grounded screen.In addition to benefit
The lower secondary magnetic field and the variation relation of time generated is motivated with Primary field, determines the Electrical distribution structure and sky of sub-surface conductors
Between form, electromagnetic signal through underground grounded screen simultaneously generate ultrasonic signal, ultrasonic signal is connect after underground medium is propagated by ultrasound
It receives array to receive ultrasonic signal, carries out data processing, the change of acoustic impedance when propagating in grounded screen by ultrasonic signal
Change, rebuilds the structure of grounded screen and surrounding medium.
The step of the method for the present invention, is as follows:
(1) first transmitting coil connect transient excitation source, transient excitation source generated in transmitting coil transient current and
Primary field is excited in transmitting coil；
(2) region for being sent to underground and covering grounded screen on the ground being oriented Primary field using transmitting coil；Once
Magnetic field is in underground propagation, and grounded screen generates induced current under the excitation of Primary field, while induced current inspires secondary magnetic
, magnetic field signal is received, data processing is carried out；
(3) induced current in grounded screen generates electromagnetic force under the collective effect of Primary field and secondary magnetic field, ground connection
Net vibration inspires ultrasound；
(4) ultrasound is propagated through underground medium to grounded screen surrounding, uses ultrasonic reception on the vertical earth's surface surface of grounded screen
Array received ultrasonic signal；
(5) by ultrasonic signal propagated in grounded screen when acoustic impedance variation, to the ultrasonic signal data received into
Row analysis；The variation of acoustic impedance when being propagated in grounded screen by ultrasonic signal, is analyzed and processed the signal received, weight
The structure of grounded screen and surrounding medium is built, realizes the imaging of an ultra shallow layer grounded screen fast hi-resolution.
Claims (1)
1. a kind of grounded screen imaging method based on transient electromagnetic method, the method is using the transition in transient electromagnetic method detection
Source forcing is motivated, transient excitation generates Primary field in transmitting coil；The transmitting for being oriented Primary field using transmitting coil
Cover the region of grounded screen to underground；Grounded screen generates induced current under the excitation of Primary field, while induced current excites
Secondary magnetic field out；In addition to motivating the lower secondary magnetic field and the variation relation of time generated using Primary field, sub-surface conductors are determined
Electrical distribution structure and spatial shape, it is characterised in that the induced current in the grounded screen is in Primary field and secondary magnetic field
Collective effect under generate electromagnetic force, inspire ultrasound；Using ultrasonic reception array received ultrasonic signal；Existed by ultrasonic signal
The variation of acoustic impedance when being propagated in grounded screen, the characteristics of using ultrasonic signal an ultra shallow layer high-resolution imaging, to the signal received
It is analyzed and processed, rebuilds the structure of grounded screen and surrounding medium, realize underground an ultra shallow layer grounded screen inversion imaging.
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| CN108387817B (en) * | 2018-01-23 | 2020-10-27 | 中国科学院电工研究所 | Grounding grid fault diagnosis method and device based on current injection type multi-field coupling |
| CN110346839A (en) * | 2019-07-30 | 2019-10-18 | 海南电网有限责任公司白沙供电局 | A kind of power distribution network shaft tower chassis, pulling plate and chuck detection system and method |
Citations (3)
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| CN103869206A (en) * | 2014-03-05 | 2014-06-18 | 中国科学院电工研究所 | Grounding network state detection system for high-frequency pulse inverse scattering imaging |
| CN105137279A (en) * | 2015-07-16 | 2015-12-09 | 吉林大学 | Grounding grid breakpoint diagnostic method based on transient electromagnetic abnormal ring principle |
| CN205080227U (en) * | 2015-10-27 | 2016-03-09 | 广东亿能电力工程有限公司 | Ground net detecting system |
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| CN103869206A (en) * | 2014-03-05 | 2014-06-18 | 中国科学院电工研究所 | Grounding network state detection system for high-frequency pulse inverse scattering imaging |
| CN105137279A (en) * | 2015-07-16 | 2015-12-09 | 吉林大学 | Grounding grid breakpoint diagnostic method based on transient electromagnetic abnormal ring principle |
| CN205080227U (en) * | 2015-10-27 | 2016-03-09 | 广东亿能电力工程有限公司 | Ground net detecting system |
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| 接地网腐蚀检测方法及其应用前景;王天正等;《电气制造》;20151230;第73-76页 * |
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