CN102262173A - Method for measuring buried depth of buried pipeline, size and direction of stray current and geomagnetic azimuth angle - Google Patents
Method for measuring buried depth of buried pipeline, size and direction of stray current and geomagnetic azimuth angle Download PDFInfo
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Abstract
The invention relates to a method for measuring the buried depth of a buried pipeline, the size and the direction of stray current and a geomagnetic azimuth angle. A probe array is formed by four magnetometer probes arranged along a direction vertical to the axial direction of the pipeline; a distance between every two probes is l; the buried pipeline is positioned under the centers of the second probe and the third probe which are positioned in the middle of the probe array; the first probe is used for measuring a horizontal component, vertical to the axial direction of the pipeline, of a magnetic field generated by pipeline current; the second probe is used for measuring a horizontal component, parallel to the axial direction of the pipeline, of the ground magnetic field; the third probe and the fourth probe are used for measuring vertical components of the magnetic field generated by the pipeline current; and measurement of parameters such as the buried depth of the pipeline, the size of the current in the pipeline, the geomagnetic azimuth angle and the like can be realized according to formulas. The method is simple and has the advantages of high measurement precision, high anti-interference capability, a large number of measured parameters and the like; furthermore, the method can be used for forming a system for detecting current of the buried pipeline interfered by the stray current of the ground; and the system can be widely applied to detection and evaluation of interference of the stray current generated by rail transportation and high speed rails on the buried pipeline.
Description
[technical field]: the present invention relates to the detection implementation method of stray current in the buried pipeline, belong to the applied technical field of corrosion detective, stray current detection.Technology such as collection magnetic measurement method, signal condition method, phase sensitive detection picking up signal, mathematic calculation, embedded system are one.
[background technology]: in track traffic transportation systems such as city underground, inter-city high-speed rail, generally adopt high voltage direct current, AC power traction, the type of drive that rail refluxes.In case the insulation of current return circuit and the earth existing problems, huge drive current can flow into the earth, underground metal structures such as buried pipeline are formed violent electrical interference, cause the metal structures to be subjected to strong corrosion, make underground structure take place at short notice to leak or damage.Electrically the existence of disturbing seriously threatens the security of operation of structures such as the pipeline that lands down.Particularly in the city bury ground gas pipeline widely distributed in the city, laying density is big.In case the corrosion failure accident of gas piping takes place, tends to cause catastrophic consequence.In addition, the leakage of current of Rail Transit System can form stray current in the earth, stray current is to the corrosion of reinforcing bar in the various fabric structures in the city, can destroy concrete globality, reduce its intensity and permanance, bring serious threat for the safety of city dweller's lives and properties.
So-called stray current is meant the electric current that flows outside the circuit of regulation or intention circuit.The electric current that flows in the circuit of regulation wherein because of flowing out in the loop fault part self-loop, flows in the environment such as the earth, water, has formed the interference current that flows in the earth.The principle that metal electrically corrodes and the situation of electrolysis are basic identical, and promptly anode carries out oxidation reaction, and negative electrode is a reduction reaction.Stray current has negative electricity from the zone that soil enters metallic conduit, is the cathodic area, and the pipeline that is in the cathodic area is not influenced by what generally; Body positively charged when stray current is a bit flowed out by certain, this zone is called the anodic site, and the body of anodic site dissolves in the surrounding medium with the form of ferric ion, and the pipeline of anodic site is subjected to violent electrolytic corrosion.
The destructive characteristics of stray current corrosion is the local corrosion of anode segments.Experience shows that 1 ampere of dc stray current flows out on the steel body, will cause the metal erosion of about 9Kg to be lost in 1 year.And in the serious zone of stray current, corrosion current can reach tens amperes or hundreds of ampere, and the corrosion that causes is quite violent.Have the buried metal pipeline of anticorrosive coat for long distance, the stray current of flow ipe is very big, and electric current can only flow out from the breakage of anticorrosive coat, thereby the easier part that concentrates on pipeline, and corrosion will be surprising.Also may harm be arranged in the cathodic area of disturbing to pipeline, when current potential negative excessively, as surpass-during 1.7V, a large amount of hydrogen can be separated out in the body surface, cause pitch class anti-corrosion insulating layer stripping damage, come off, thereby make the pipeline in cathodic area that corrosion failure also take place.
The detection that stray current disturbs: the stray current that track traffic produces belongs to dynamic stray current mostly, and traditional measuring method is difficult to detect effectively.Because the defective that links such as track traffic facilities design and construction exist causes drive current to produce and leaks into the earth formation stray current.When locomotive operation near herein, this stray electrical is stayed and can sharply be increased; When locomotive gradually away from after, stray electrical fails to be convened for lack of a quorum and reduces gradually.The degree of this interference can be in the different periods of every day, because of the busy extent difference difference of track traffic.Thereby, for the detection of dynamic stray current only use simple ground voltage gradient method often can not detect effectively dynamic stray current have rule and to the extent of injury, the hazard approach of underground structure in a certain zone.
Current domestic and international application is the stray current detector SCM of Radiodetection Limited in the main flow equipment that stray current detects, and the equipment of domestic production does not have current measurement function, can not satisfy the demand that detects under the complex environment.And the SCM detector of using adopts is the survey magnetic technology at the beginning of the nineties in last century, application be the magnetometer probe of 5 two components because the probe precision is low, can only satisfy the primary demand of current measurement by complicated measurement structure.The detection system complex structure of Zu Chenging thus, the data processing algorithm complexity, the measurement result precision is low, and cost is high.
Background technology
[summary of the invention]:
The present invention seeks to solve and only use the problem that simple ground voltage gradient method often can not detect the dynamic stray current in the buried pipeline effectively at present, the detection method of size, direction and the magnetic azinuth of stray current in a kind of buried depth of buried pipeline and the pipeline is provided.
Intraductal electric current measuring method of the present invention is applied to, and has in the stray current checkout equipment of data storage function intraductal electric current size, direction and azimuthal measurement.The stray current checkout equipment is used to finish the pipeline there being interference, detects the direction and the intensity of stray current in the pipeline.By the multiple spot of many checkout equipments in a detector segments arranged, measured in continuous 24 hours, the detection data of long duration will be noted, the application data analysis software is to the different periods, the detection data of different location are analyzed, correlation analysis, draw the mutual relationship of interference current, determine the flow direction and the size of stray current, inflow and outflow point on pipeline, thus the jamming pattern of clear stray current visited.Can also determine the regularity of distribution of electric current size and Orientation on the same pipeline diverse location by the analysis that detects data, determine section in the stray current interference of pipeline existence, cooperate field investigation just can determine the definite source of stray current, and then the interference law formulation of corresponding stray current go out the resolution of stray current.
The detection method of buried pipeline buried depth provided by the invention and stray current size, direction and magnetic azinuth comprises:
1st, two magnetometer probe (hereinafter to be referred as probe) edges that are used for the vertical component measurement in pipeline electric current I generation magnetic field are placed perpendicular to ground with the pipeline axial vertical direction, be called the 3rd probe and the 4th probe, spacing between the probe is l, near the probe of pipeline one side promptly the 3rd distance of popping one's head in through the perpendicular of piping be
2nd, measure the pipeline electric current I respectively and produce the vertical component H in magnetic field in described two probe positions of the 1st step
3 hang down, H
4 hang down
3rd, adopt following formula to calculate buried depth of pipeline d,
4th, adopt following formula to calculate the pipeline electric current I,
5th, the direction of electric current I produces the direction determining in magnetic field in conjunction with the pipeline electric current I in described two probe positions of the 1st step according to the electromagnetic right-hand rule in the pipeline.
6th, the detection method of buried pipeline location magnetic azimuth is:
6.1st, on the 1st step, described two probes were along the line, place two probes in addition, a probe is called first probe, be used for the measurement that the pipeline electric current I produces the horizontal component of magnetic field and terrestrial magnetic field, another probe is called second probe, be used for of the measurement of big terrestrial magnetic field in the ground of pipeline axial parallel direction magnetic component, spacing between the adjacent probe is l, in the middle of buried pipeline is positioned at two probes promptly second probe and the 3rd probe central under;
6.2nd, by first probe measurement go out the pipeline electric current I in magnetic field that first probe positions produces at the axial horizontal component H of vertical pipe
1 water
6.3rd, by second probe measurement go out big terrestrial magnetic field with the horizontal component H of pipeline axial parallel direction
Horizon
6.4th, use following formula and calculate the pipeline electric current I produces magnetic field in the 4th probe positions horizontal component H
4 water:
Wherein, d is the buried depth of pipeline that calculates in above the 3rd step;
6.5th, last, the angle that calculates linear transducer array axis and terrestrial magnetic field direction by following formula is a magnetic azinuth:
The resolution of described each probe is 1nT, and range is 100,000 nT; Each probe adopts square wave excitation, and driving voltage is 2.0～3.2V, and frequency is 1.0K～10.0KHz; The phase sensitive detection frequency of measuring output is 2 times of pumping signal, and measurement result is 22 bit data length, and the input of 50mS at interval.
Four probes on same axis linearly mode arrange, be installed in an aluminum or the plastic rectangle case, the excitation signal generator of built-in each probe, phase sensitive detection and integral filtering electric current in the case, other has the microprocessor control panel of four road probe detection signal analog to digital conversion and processing.
Detection computations foundation of the present invention and principle:
Definition: the axis of establishing the centre distance detection probe array of buried pipeline is d (buried depth of pipeline), unit: rice
Spacing between each probe is l, unit: rice.
1. the distance of each probe distance pipeline center's point is:
2. the electric current that passes through in the rectilinear duct of hypothesis endless is I, cuts down law according to Biot-Sha, can draw on the point of distance pipeline center's point R, and magnetic field intensity is on the tangential direction of its pipe circumference:
Wherein: H be pipeline top apart from the magnetic field intensity on the R of the pipeline center point,
I is the current value that passes through in the pipeline,
Can draw by formula 1,2 and 3:
Known is electric current on the same pipeline recording electric current on the position 3,4, has:
Wherein: H
3, H
4Be that 3,4 of positions are located by magnetic field intensity on the pipeline tangential direction of electric current I generation in the pipeline,
3. the calculating of buried depth of pipeline
Because the probe on the position 3,4 is under the acting in conjunction that the pipeline electric current produces magnetic field and big terrestrial magnetic field, can not be directly level by measuring this Dian Chu magnetic field and the vertical component magnetic field intensity that calculates the pipeline tangential direction.In using, engineering the earth can be regarded as uniform dielectric body, according to the law of electromagnetic induction, the rate of change of magnetic field along continuous straight runs is zero on the face of land, and vertical component is zero, just think on the ground, when not having other magnetic fields to exist, the vertical component of the big terrestrial magnetic field that records is zero.Therefore, 3, the 4 measured vertical components of popping one's head in Fig. 2 are not contain geomagnetic field action, but the horizontal magnetic field that records on probe 1 produces the superposition value of magnetic field and terrestrial magnetic field horizontal component on the pipeline axial vertical direction for the pipeline electric current.
Can prove, straight line and the formed angle β of vertical curve that passes through pipeline center by pipeline center and center probe, the tangential direction that produces magnetic field with pipeline electric current on the probe positions equates with horizontal angle β, can draw according to the triangle correspondence theorem:
With formula 6,7 and 8 simultaneous, the computing formula that can draw buried depth of pipeline is:
Wherein: H
3 hang down, H
4 hang downBe on position 3,4, to record the numerical value that the pipeline electric current produces the magnetic field vertical component,
H
3 water, H
4 waterBe the reckoning numerical value that the pipeline electric current produces the magnetic field levels component on position 3,4.
4. the pipeline electric current after big terrestrial magnetic field factor is eliminated calculates, direction of current is determined
Owing to comprise the factor of earth magnetism in the horizontal component in magnetic field, place, ground, pipeline top, in calculating pipeline, it must be eliminated during electric current in the true pipe.And 3,4 vertical components of measuring magnetic field of popping one's head in do not contain the earth magnetism factor.So application of formula 7,8,9 can be extrapolated:
As seen, application of formula 6,10,11 measured values that can pass through the vertical component of position 3,4 calculate ducted electric current I:
The magnetic field of electric current vertically downward direction measurement in probe 3,4 according to the electromagnetic right-hand rule, determines that electric current is (the seeing that the interior arrow tail cross of pipeline is represented among Fig. 3) that flows inwards in the pipe for just in the regulation pipe.When the numerical value of probe 3,4 mensuration is negative value (magnetic direction vertically upward), show that electric current is outwards to flow in the pipe.Thus, can determine the flow direction of electric current in the pipe.
4. the probe 2 arranged of the application level position angle of measuring linear transducer array and earth magnetism
In Fig. 2, the probe 2 of horizontal positioned can be measured the horizontal component of terrestrial magnetic field on the pipeline axial direction, does not contain current field in the pipe.Simultaneously, probe 1 can be measured pipeline current field and earth magnetism in the acting in conjunction perpendicular to the magnetic field levels direction on the pipeline axial direction, and application of formula 7 has calculated the horizontal component value of pipeline electric current generation magnetic field at the vertical pipe axial direction, then has:
The angle of linear transducer array axis and magnetic direction is:
Wherein: H
HorizonBe the probe 2 big terrestrial magnetic field of measuring with the horizontal component of pipeline axial parallel direction,
H
1 waterBe to produce magnetic field in the axial horizontal component of vertical pipe at the pipeline electric current that probe 1 records,
H
4 waterIt is the horizontal component that application of formula 8 calculates pipeline electric current generation magnetic field on position 4.
Advantage of the present invention and good effect:
The detection of the electrical interference that the earth stray current that the present invention is applied to formation such as electrified track traffic facility causes buried pipeline can realize effectively that various stray currents do not excavate detection to underground structures harm.The result who detects comprises: the strength of current in the pipeline, direction of current, pick-up unit above pipeline during place vertical with pipeline axial with the position angle of big terrestrial magnetic field.
Technology such as this invention collection magnetic measurement structure and method, signal condition method, phase sensitive detection picking up signal method, measurement result computation model, embedded system are one.Make the instrument system of detection method and formation have advantages such as accuracy of detection height, measurement parameter is complete, measuring method is simply effective, specifically comprise:
1) the present invention adopts buried pipeline stray current detection probe array structure to measure: a plurality of parameters such as position angle of the intensity level of stray current, stray current direction, buried depth of pipeline and instrument and earth magnetism in the pipe, cooperate circuit such as signal condition, phase sensitive detection, integral filtering, and testing result is calculated, data storage, control and data processing software formation buried pipeline stray current detection systems such as system operation interface, data processing.
2) used linear transducer array structure of the present invention and detection computations method have been eliminated existence of big terrestrial magnetic field and the fluctuation interference to testing result fully, effectively raise the scope of application of current measuring method in the pipe, have improved the reliability of testing result.
3) the present invention can be widely used in various stray currents underground structures are formed the detection of electrical interference and the detection of hazard approach.Cooperate correlation analysis software systems such as data analysis, can finish searching and locating of various stray currents source, the stray current resolution provides scientific basis and field data support on the buried pipeline in order to formulate.
4) the present invention adopts the fluxgate type probe to constitute the stray current detection arrays, has advantages such as measuring accuracy height, sense cycle weak point, favorable repeatability.Reduce the structural complexity of the linear transducer array of existing stray current detecting instrument effectively, lowered equipment cost.
[description of drawings]:
Fig. 1 is the linear transducer array arrangement synoptic diagram that the present invention adopts;
Fig. 2 is the angle orientation synoptic diagram of linear transducer array axis and terrestrial magnetic field;
Fig. 3 is pipeline current field direction and eliminates big terrestrial magnetic field to measuring the method synoptic diagram of influence;
Fig. 4 is the flux-gate magnetometer signal processing circuit.
[embodiment]:
Embodiment 1: dynamic stray current detector SCM-Logger
SCM-Logger stray current detector is that the detection detection arrays by one group of 4 probe is core, uses the specialized equipment that the dynamic stray current of buried pipeline detects.Instrumental function is: under the industrial and mineral condition of complexity, ground above buried pipeline, linear transducer array is placed with the axial direction of vertical pipe, the upper computer software of using portable computer is finished the various detected parameters settings of stray current testing process, functions such as measurement data result and direction of current, azimuth compass, potential waveform demonstration and supervision in the testing process.Detect implementation process for dynamic stray current, suggestion is adopted simultaneously and is no less than 3 cover SCM-Logger checkout equipments.
1. the realization of hardware:
Adopt PIC24FJ256G type microprocessor to constitute the measuring unit of stray current detector, finish: testing circuit control, testing result are calculated in real time, the result data storage, power management, with function such as host computer digital communication.
Adopt the four measuring fluxgate magnetometer sensor, each probe spacing is a l=0.4 rice, and process is seen Fig. 1.
The driving of each probe, frequency-selecting, phase sensitive detection, integral filter circuit are seen Fig. 4.
The PIC24FJ256G type microprocessor of realizing the SCM-Logger design function has following resource:
A, clock frequency are 100MHz.
B, have two serial ports that have the SPI function, 3 of common serial ports.
C, data-carrier store expansion 64K (16).
D, program/more than the data-carrier store 64K.
2. the realization of detection method:
1) current measurement function
After 3,4 probes recorded magnetic field vertical component numerical value, application of formula (12) calculated stray current size of data in the pipeline:
Behind 5 groups of numerical value of every measurement, use H
3 hang down, H
4 hang downCurrent values of mean value calculation, carry out data storage and demonstration.
The direction of electric current I produces the direction determining (see principle part) in magnetic field in conjunction with the pipeline electric current I 3,4 two probe positions according to the electromagnetic right-hand rule in the pipeline.
2) buried depth of pipeline measurement function
Between the beginning current measurement, after application 3,4 probes record magnetic field vertical component numerical value, calculate buried depth of pipeline numerical value with formula (9):
After measuring 16 groups of numerical value, use H
3 hang down, H
4 hang downBuried depth numerical value of mean value calculation, the measurement of a buried depth of pipeline, calculating as a result, data storage and demonstration are only carried out in each measurement.
3) pipeline rout measurement of azimuth function
Before the beginning current measurement, use 1,2 probe record with the pipeline axial vertical direction on horizontal component, and big terrestrial magnetic field calculates the pipeline position angle with formula (13) behind the magnetic-field component numerical value of pipeline axial direction:
After measuring 16 groups of numerical value, azimuth value of the mean value calculation of application probe 1,2 measured value, the measurement of a buried depth of pipeline, calculating as a result, data storage and demonstration are only carried out in each measurement.
4) dynamically the technical specification of stray current detecting instrument is:
Embodiment 2: static stray current detector IPL
IPL stray current detector is the detection specialized equipment that buried pipeline is formed static stray current interference at the cathodic protection system of third party's pipeline.Instrumental function is: the electric current cutout that will have the satellite synchronizing function is applied on the current source of the cathodic protection system that may disturb, ground above disturbed buried pipeline, and linear transducer array is placed with the axial direction of vertical pipe.The host computer of using portable computer is finished the various detected parameters settings of stray current testing process, testing process detects data result and detects functions such as electric current, potential waveform demonstration and supervision.
1. instrument hardware realizes with embodiment 1.
2. detection method realizes
1) electric current realization, each measurement parameter computing function are with embodiment 1
2) technical specification of static stray current detecting instrument is:
| The data recording mode | The SD card |
| The host computer interface | USB |
| Data channel | Totally 4 passages, 1 channel current, 2 channeling potentials ± 10V |
| Measuring ability | Electric current, pipe-to-soil potential, earth potential gradiometry in the pipe |
| The satellite synchronizing function | Can accept 12 road gps satellite signals, lock in time precision＜0.1s |
| The data recording cycle | 50mS |
| The data recording time | 24 hour data records |
| Sample frequency | 1KHz |
| Registration accuracy | Electric current 0.1A, current potential 0.1mV |
| Data presentation | The host computer real time data shows |
| Battery | It is chargeable that plumbic acid holds the pond, and power supply is greater than more than 12 hours continuously |
| Software | Data analysis demonstration and Control Software IPL-Dview |
List of references:
1.J.A. Beijing, Ai Demi Nice Te Er engineering electromagnetic field basis: Science Press, version in 2002
2.Stray?Current?Mapper?User?Manual?Radiodetection?Corp.2007
3. the Mai Geweier fluxgate sensor Technical White Paper for Mai Geweier of Shanghai Maritime University electromagnetism laboratory version in 2010
4. fourth letter is good etc., the latest developments Advances in Geophysics Vol.19 No.4 Dec.2004 of flux-gate magnetometer and probe development
Claims (4)
1. the measuring method of a buried pipeline buried depth and stray current size, direction and magnetic azinuth is characterized in that this method comprises:
1st, be used for the pipeline electric current with two
IProduce magnetometer probe that the vertical component in magnetic field measures hereinafter to be referred as probe, along placing perpendicular to ground, be called the 3rd probe and the 4th probe with the pipeline axial vertical direction, between spacing be
, near the probe of pipeline one side promptly the 3rd distance of popping one's head in through the perpendicular of piping be
2nd, measure the pipeline electric current respectively
IProduce the vertical component in magnetic field in described two probe positions of the 1st step
3rd, adopt following formula to calculate buried depth of pipeline d,
(9)
4th, adopt following formula to calculate the pipeline electric current
I,
5th, electric current in the pipeline
IDirection according to the electromagnetic right-hand rule in conjunction with the pipeline electric current
IProduce the direction determining in magnetic field in described two probe positions of the 1st step.
2. method according to claim 1 is characterized in that the detection method of buried pipeline location magnetic azimuth is:
Place two probes in addition on the 1st step, described two probes were along the line, a probe is called first probe, is used for the pipeline electric current
IProduce the measurement of the horizontal component of magnetic field and earth magnetism, another probe is called second probe, is used for the measurement of big terrestrial magnetic field in the ground of pipeline axial parallel direction magnetic component, and the spacing between the adjacent probe is
, in the middle of buried pipeline is positioned at two probes promptly second probe and the 3rd probe central under;
Go out the pipeline electric current by first probe measurement
IIn magnetic field that first probe positions produces in the axial horizontal component of vertical pipe
By second probe measurement go out big terrestrial magnetic field with the horizontal component of pipeline axial parallel direction
Use following formula and calculate the pipeline electric current
IProduce the horizontal component in magnetic field in the 4th probe positions
:
Wherein, d is the buried depth of pipeline that calculates in the 3rd step of claim 1;
At last, the angle by following formula calculating linear transducer array axis and terrestrial magnetic field direction is a magnetic azinuth:
3. method according to claim 1 and 2 is characterized in that, the resolution of described each probe is 1 nT, and range is 100,000 nT; Each probe adopts square wave excitation, and driving voltage is 2.0～3.2V, and frequency is 1.0K～10.0KHz; The phase sensitive detection frequency of measuring output is 2 times of pumping signal, and measurement result is 22 bit data length, and the input of 50mS at interval.
4. method according to claim 3, it is characterized in that, four probes on same axis linearly mode arrange, be installed in an aluminum or the plastic rectangle case, the pumping signal of built-in each probe produces circuit, phase-sensitive detection circuit, integral filtering and signal-processing board in the case.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104199123A (en) * | 2014-08-07 | 2014-12-10 | 上海瑞洋船舶科技有限公司 | Submarine cable laying quality detection system |
| CN104459279A (en) * | 2014-12-16 | 2015-03-25 | 上海斐讯数据通信技术有限公司 | Method for measuring wire current and electronic device |
| CN106569017A (en) * | 2016-11-15 | 2017-04-19 | 深圳市科安达轨道交通技术有限公司 | Rail transit stray current detection method and detection system |
| CN108020713A (en) * | 2017-10-16 | 2018-05-11 | 中国石油大学(北京) | A kind of non-contact measurement apparatus and method of buried pipeline geomagnetic induction current GIC |
| CN108254434A (en) * | 2018-02-11 | 2018-07-06 | 广东省特种设备检测研究院顺德检测院 | A kind of the linear transducer array device and detection method of the detection of buried pipeline digging-free magnetic strength |
| CN108562782A (en) * | 2018-07-17 | 2018-09-21 | 国网湖南省电力有限公司 | A kind of acquisition methods of stray electrical current and the detecting system of stray electrical current |
| CN108646079A (en) * | 2018-06-29 | 2018-10-12 | 苏州大学 | Lower stray electrical current non-contact detection method coexists in a kind of different buried depth pipeline |
| CN109883450A (en) * | 2019-04-11 | 2019-06-14 | 中国石油化工股份有限公司 | Method for positioning magnetic marker of detector in buried steel pipeline |
| CN110687609A (en) * | 2018-07-06 | 2020-01-14 | 中国石油化工股份有限公司 | Method for eliminating interference of parallel pipelines in detection of alternating current and direct current stray currents of buried pipelines |
| CN110687338A (en) * | 2018-07-06 | 2020-01-14 | 中国石油化工股份有限公司 | Detection method for alternating current and direct current stray current of buried pipeline |
| CN112083500A (en) * | 2019-07-11 | 2020-12-15 | 安徽省勘查技术院(安徽省地质矿产勘查局能源勘查中心) | Method and system for identifying steep-inclined vein-shaped gold ores under thick covering layer |
| CN113138421A (en) * | 2021-04-30 | 2021-07-20 | 西南石油大学 | Buried depth and trend detection method for buried metal pipeline |
| CN113341268A (en) * | 2021-04-23 | 2021-09-03 | 国网江西省电力有限公司电力科学研究院 | Fault section positioning method utilizing magnetic field distribution characteristics below overhead line of power distribution network |
| CN113687428A (en) * | 2021-08-25 | 2021-11-23 | 天津市嘉信技术工程公司 | Accurate electromagnetic calibration method for ultra-deep underground pipeline position |
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| CN104199123A (en) * | 2014-08-07 | 2014-12-10 | 上海瑞洋船舶科技有限公司 | Submarine cable laying quality detection system |
| CN104459279A (en) * | 2014-12-16 | 2015-03-25 | 上海斐讯数据通信技术有限公司 | Method for measuring wire current and electronic device |
| CN106569017B (en) * | 2016-11-15 | 2019-03-05 | 深圳市科安达轨道交通技术有限公司 | A kind of rail traffic stray electrical current detection method and detection system |
| CN106569017A (en) * | 2016-11-15 | 2017-04-19 | 深圳市科安达轨道交通技术有限公司 | Rail transit stray current detection method and detection system |
| CN108020713A (en) * | 2017-10-16 | 2018-05-11 | 中国石油大学(北京) | A kind of non-contact measurement apparatus and method of buried pipeline geomagnetic induction current GIC |
| CN108254434A (en) * | 2018-02-11 | 2018-07-06 | 广东省特种设备检测研究院顺德检测院 | A kind of the linear transducer array device and detection method of the detection of buried pipeline digging-free magnetic strength |
| CN108254434B (en) * | 2018-02-11 | 2022-02-01 | 广东省特种设备检测研究院顺德检测院 | Buried pipeline excavation-free magnetic induction detection probe array device and detection method |
| CN108646079A (en) * | 2018-06-29 | 2018-10-12 | 苏州大学 | Lower stray electrical current non-contact detection method coexists in a kind of different buried depth pipeline |
| CN108646079B (en) * | 2018-06-29 | 2019-06-28 | 苏州大学 | Lower stray electrical current non-contact detection method coexists in a kind of different buried depth pipeline |
| CN110687338B (en) * | 2018-07-06 | 2022-01-28 | 中国石油化工股份有限公司 | Detection method for alternating current and direct current stray current of buried pipeline |
| CN110687609A (en) * | 2018-07-06 | 2020-01-14 | 中国石油化工股份有限公司 | Method for eliminating interference of parallel pipelines in detection of alternating current and direct current stray currents of buried pipelines |
| CN110687338A (en) * | 2018-07-06 | 2020-01-14 | 中国石油化工股份有限公司 | Detection method for alternating current and direct current stray current of buried pipeline |
| CN110687609B (en) * | 2018-07-06 | 2022-02-01 | 中国石油化工股份有限公司 | Method for eliminating interference of parallel pipelines in detection of alternating current and direct current stray currents of buried pipelines |
| CN108562782B (en) * | 2018-07-17 | 2020-06-16 | 国网湖南省电力有限公司 | Stray current acquisition method and stray current detection system |
| CN108562782A (en) * | 2018-07-17 | 2018-09-21 | 国网湖南省电力有限公司 | A kind of acquisition methods of stray electrical current and the detecting system of stray electrical current |
| CN109883450A (en) * | 2019-04-11 | 2019-06-14 | 中国石油化工股份有限公司 | Method for positioning magnetic marker of detector in buried steel pipeline |
| CN112083500A (en) * | 2019-07-11 | 2020-12-15 | 安徽省勘查技术院(安徽省地质矿产勘查局能源勘查中心) | Method and system for identifying steep-inclined vein-shaped gold ores under thick covering layer |
| CN112083500B (en) * | 2019-07-11 | 2024-02-23 | 安徽省勘查技术院(安徽省地质矿产勘查局能源勘查中心) | Method and system for identifying steep inclined pulse gold ores under thick coverage layer |
| CN113341268A (en) * | 2021-04-23 | 2021-09-03 | 国网江西省电力有限公司电力科学研究院 | Fault section positioning method utilizing magnetic field distribution characteristics below overhead line of power distribution network |
| CN113341268B (en) * | 2021-04-23 | 2022-09-02 | 国网江西省电力有限公司电力科学研究院 | Fault section positioning method utilizing magnetic field distribution characteristics below overhead line of power distribution network |
| CN113138421A (en) * | 2021-04-30 | 2021-07-20 | 西南石油大学 | Buried depth and trend detection method for buried metal pipeline |
| CN113138421B (en) * | 2021-04-30 | 2022-01-28 | 西南石油大学 | Buried depth and trend detection method for buried metal pipeline |
| CN113687428A (en) * | 2021-08-25 | 2021-11-23 | 天津市嘉信技术工程公司 | Accurate electromagnetic calibration method for ultra-deep underground pipeline position |
| CN113687428B (en) * | 2021-08-25 | 2023-07-14 | 天津市嘉信技术工程公司 | Precise electromagnetic calibration method for ultra-deep underground pipeline azimuth |
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