CN106019013A - High voltage support lightning protection reliability integrated diagnosis method - Google Patents

High voltage support lightning protection reliability integrated diagnosis method Download PDF

Info

Publication number
CN106019013A
CN106019013A CN201610386945.0A CN201610386945A CN106019013A CN 106019013 A CN106019013 A CN 106019013A CN 201610386945 A CN201610386945 A CN 201610386945A CN 106019013 A CN106019013 A CN 106019013A
Authority
CN
China
Prior art keywords
measurement
earth
lightning protection
resistance
testing
Prior art date
Application number
CN201610386945.0A
Other languages
Chinese (zh)
Inventor
刘富文
刘居辉
王六玉
Original Assignee
福建优迪电力技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 福建优迪电力技术有限公司 filed Critical 福建优迪电力技术有限公司
Priority to CN201610386945.0A priority Critical patent/CN106019013A/en
Publication of CN106019013A publication Critical patent/CN106019013A/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/003Environmental or reliability tests
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices

Abstract

The invention discloses a high voltage support lightning protection reliability integrated diagnosis method. The high voltage support lightning protection reliability integrated diagnosis method comprises the following steps (1) measurement of soil resistivity of actual environment of a high voltage support, (2) measurement of grounding resistance; (3) measurement of hidden earth screen physical parameters; (4) a data export background diagnosis system. Compared with the prior art, the high voltage support lightning protection reliability integrated diagnosis method is advantageous in that the soil resistivity of the position of the support and the grounding resistance of the support are sequentially measured; the distribution condition measurement of the lightning protection reliability key leakage capabilities of the high voltage support hidden physical earth screen such as the depth of the earth screen, the strike of the earth screen, the length of the ray of the earth screen, the strike map of the earth screen, and so on is carried out to realize the integrated diagnosis of the support lightning protection reliability, and therefore the improvement of the safe operation of the support is realized.

Description

A kind of error comprehensive diagnosis method of high pressure shaft tower lightning protection reliability
Technical field
The present invention relates to the diagnostic method of high pressure shaft tower, be specifically related to the error comprehensive diagnosis method of a kind of high pressure shaft tower lightning protection reliability.
Background technology
The earth mat situation of electric power line pole tower has influence on the safe operation of electrical network, grounding requirement has earth resistance, soil resistivity and earth mat to lay the technical specification that the degree of depth, length etc. are relevant according to code, detection to lightning protection reliability at present is mainly measured with grounding resistance and soil resistivity measuring method, and the ray degree of depth and length to its hidden earth mat can only carry out spot-check hand excavation in shaft tower initial test and check and accept, excavate efficiency the lowest, there is hidden danger in the safe operation to electrical network the most comprehensively and manually.
Summary of the invention
The present invention is to solve above-mentioned deficiency, it is provided that the error comprehensive diagnosis method of a kind of high pressure shaft tower lightning protection reliability.
The purpose of the present invention is realized by technical scheme once: the error comprehensive diagnosis method of a kind of high pressure shaft tower lightning protection reliability, comprises the following steps:
(1) soil resistivity of the actual environment of measurement high pressure shaft tower:
Soil resistivity four-electrode method (Wenner method) measures, and calculates soil resistivity ρ according to formula ρ=2 π aR (Ω m), and unit is Ω m, wherein: a electrode spacing;The resistance of soil between R P (S)-ES electrode;
(2) measurement of grounding resistance:
Earth resistance is tested by four line precision measurement methods, three-terminals testing method, two wires easily-testing method, four line options method methods of testing, three line options method methods of testing, double pincers method method of testing;
(3) measurement of hidden earth mat physical parameter:
Measuring instrument interface chooses earth mat physical parameters measurement function, and a clip of measuring instrument special measurement is connected on the ground stud that measuring instrument is subsidiary and is inserted underground or clamps directly on shaft tower frame;Another clip is connected with the hidden earth mat down conductor of shaft tower lightning protection;Then opening handheld terminal and receive device, measuring instrument is combined with gps satellite location technology and electromagnetic induction principle carries out the overall path trend of hidden earth mat, radical and the corresponding measurement of embedment ground depth value, is completed selection and preserves and return the upper level page.Measuring instrument is closed after being all completed;
(4) data derivation backstage diagnostic system:
All data that are completed preserve, using SD card or UPS interface that test result is downloaded to integrated diagnostic system, the comprehensive diagnos report forming the technical specification relevant with regard to earth resistance, soil resistivity and hidden design the laying degree of depth, length etc. is had access to or prints archive by system.
Present invention advantage compared with prior art is: traditional mainly only have high pressure shaft tower lightning protection reliability measurement measurement of Grounding Resistance, soil resistivity measuring method are measured, and actually earth resistance, two indexs of soil resistivity can change along with the change of ambient weather environment, the most only survey that these two parameters are actual only has part reference significance and the most comprehensive to shaft tower lightning protection reliability testing.The method of the present invention can be measured the soil resistivity of shaft tower present position, the grounding resistance of shaft tower successively, more the high pressure shaft tower covert physical earth mat of its lightning protection reliability key leakage ability can also be carried out distribution situation measurement, as: the degree of depth of earth mat, earth mat trend, the length of earth mat ray, earth mat are moved towards the information such as figure and are measured and realize a kind of comprehensive diagnos new method to shaft tower lightning protection reliability, to realize improving the safe operation of shaft tower.
Accompanying drawing explanation
Fig. 1 is the flow chart of error comprehensive diagnosis method of the present invention.
Fig. 2 is four-electrode method p-wire connection diagram.
Fig. 3 is the wiring schematic diagram of four line precision measurement earth resistances.
Fig. 4 is multiple spot independent grounding system or the wiring schematic diagram of relatively large earth mat four line precision measurement earth resistance.
Fig. 5 is the wiring schematic diagram of three-terminals testing earth resistance.
Fig. 6 is the wiring schematic diagram of two wires easily-testing earth resistance.
Fig. 7 is the wiring schematic diagram of four line options method test earth resistances.
Fig. 8 is wiring schematic diagram multiple spot independent grounding system or relatively large earth mat four line options method being tested to earth resistance.
Fig. 9 is the wiring schematic diagram of the earth resistance that can accurately survey tested shaft tower in the case of not tripping by four line options methods.
Figure 10 is the wiring schematic diagram of three line options method test earth resistances.
Figure 11 is the wiring schematic diagram of double pincers method test earth resistance.
Figure 12 is the wiring schematic diagram of the measurement of hidden earth mat physical parameter.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail.
As it is shown in figure 1, the error comprehensive diagnosis method of a kind of high pressure shaft tower lightning protection reliability, comprise the following steps:
(1) soil resistivity of the actual environment of measurement high pressure shaft tower:
Soil resistivity ρ is the important factor determining grounding body earth resistance.Soil of different nature, no doubt has different soil resistivities, it is simply that same soil, and due to the difference such as temperature and water content, soil resistivity also can occur significant change therewith.Therefore, in order to there be correct foundation when carrying out the design of grounding, make designed grounding device more can meet the needs of real work, it is necessary to carry out the measurement of soil resistivity.
Soil resistivity four-electrode method (Wenner method) measures, and calculates soil resistivity ρ according to formula ρ=2 π aR (Ω m), and unit is Ω m, wherein: a electrode spacing;The resistance of soil between R P (S)-ES electrode;
Four-electrode method (Wenner method): connecting test line as shown in Figure 2, note the spacing between auxiliary earth rod and length of embedment, respectively by C (H), P (S), ES, E auxiliary earth rod in straight line buried enter the earth, earthing test line (red, yellow, and green, black) is started correspondence be connected to tested C (H), P (S), ES, E auxiliary earth rod from the C (H) of instrument, P (S), ES, E interface.
Determine according to Wenner method and measure the soil resistivity of distance a depth that the value of soil resistivity is about between two earth rods, soil homogeneity can be checked by changing a value, thus design suitable ground electrode.
The spacing of auxiliary earth rod is arranged: after connecting p-wire, and measuring instrument start liquid crystal interface select soil resistivity to measure function, enters soil resistivity test pattern and opens the measurement of examination soil resistivity, is completed selection and preserves and return upper level homepage.
(2) measurement of grounding resistance:
1. four line precision measurement earth resistance:
Four line tests: four-wire method test can eliminate the impact on measuring of the contact resistance between tested grounding body, auxiliary earth rod, test clip, instrument input interface (generally have dirt or get rusty) surface, the impact on measuring of the line resistive can be eliminated, be better than three-terminals testing.
As shown in Figure 3, from testee, respectively by P (H), C (H) auxiliary earth rod in straight line buried enter the earth, earthing test line (black, green, yellow, red) is connected to tested earthing pole E, boost voltage pole P (S), auxiliary current pole C (H) from E, ES, P (S) of instrument, C (H) interface correspondence.
For multiple spot independent grounding system or relatively large earth mat, the p-wire that can match 50m or longer is tested, as shown in Figure 4:
R=r1 ∥ r2 ∥ r3 ∥ r4 ∥ r5 ∥ r6 ∥ ... ∥ rn (r1 ... rn is independent grounding point);
R meter reading;
R1 ... rn is independent grounding point;
The resistance to earth of rC auxiliary current pole C (H);
The resistance to earth of rP boost voltage pole P (S);
After connecting p-wire, function selecting is carried out at main interface, enters earth resistance pattern, shows stable data, the grounding resistance R of the most tested grounding body after being completed.
After being completed, select to preserve and return the upper level page.
2. three-terminals testing earth resistance:
Three-terminals testing: as it is shown in figure 5, the ES of short circuit instrument, E interface, be three-terminals testing, instrument operation and the test of four lines identical.Three-terminals testing can not eliminate the impact on measuring of the line resistive, can not eliminate between instrument and p-wire, the contact resistance variation impact on measuring between p-wire and auxiliary earth rod, also needs to remove the oxide layer on tested grounding body surface during measurement.
3. two wires easily-testing earth resistance:
Measure with two cable: the method is the ordinary surveying method not using auxiliary earth rod, utilize the earthing pole of existing grounding resistance minimum as auxiliary earth pole, use 2 easily-testing lines to connect (i.e. C (H)-P (S) interface short circuit, E-ES interface short circuit).The lightning protection pole etc. that can utilize the metal embedded object such as metallic water pipe, fire hydrant, the common ground of commercial electric power system or building replaces auxiliary earth rod C (H), P (S) to note removing the oxide layer of selected metal auxiliary earth body junction point when measuring.As shown in Figure 6, instrument operation is with four line tests in wiring.
4. four line options method test earth resistance:
Four line options methods can accurately measure the grounding resistance of one of them grounding body in the case of not tripping, four-wire method test can eliminate the impact on measuring of the contact resistance between tested grounding body, auxiliary earth rod, test clip, instrument input interface (generally have dirt or get rusty) surface, the impact on measuring of the line resistive can be eliminated, be better than three-terminals testing.
See Fig. 7, from the beginning of testee, respectively by P (S), C (H) auxiliary earth rod in straight line buried enter the earth, by (black for earthing test line, green, yellow, red) from the E of instrument, ES, P (S), C (H) interface starts correspondence and is connected to tested earthing pole E, boost voltage pole P (S), on auxiliary current pole C (H), one end blueness plug of CT2 current clamp is inserted instrument C1 interface, black plug inserts instrument C2 interface, current clamp clamps in the downlead of tested grounding body, note the direction of current clamp, electric current must flow into guarantee measurement accuracy from current clamp front.
After connecting p-wire, interface function selects, and enters corresponding earth resistance pattern and starts test, and count down in test process instruction and the instruction of testing progress rod figure, stable data are shown, the grounding resistance R of the tested grounding body in the left side in upper figure after being completed.
For multiple spot independent grounding system or relatively large earth mat, the p-wire that can match 50m or longer is tested, and as shown in Figure 8, measurement result is the grounding resistance of Re, not by r1, r2, r3, r4, r5 ... the impact of grounding resistance.
As shown in Figure 9, in the case of not tripping, can accurately survey the grounding resistance Re of tested shaft tower by four line options methods when measuring pole tower ground resistance, measure in the case of not tripping with three traditional line four-wire methods be resistance be Re in parallel with R1, R2, R3 after resistance, if there is fault in Re, and it is difficult to find out place, Re trouble point with three traditional line four-wire methods in the case of resistance is less after R1, R2, R3 parallel connection, is easily left in the basket.
5. three line options method test earth resistance:
Three linear selection system method tests: as shown in Figure 10, the ES of short circuit instrument, E interface, it is three line options method tests, instrument operation and the test of four line options methods are identical.Three line options methods tests can not eliminate the impact on measuring of the line resistive, can not eliminate between instrument and p-wire, the contact resistance variation impact on measuring between p-wire and auxiliary earth rod, also needs to remove the oxide layer on tested grounding body surface during measurement.
The most double pincers methods test earth resistance:
Double pincers methods are suitable for measuring the situation of independent multipoint earthing system, as shown in figure 11, in multipoint earthing system without beating pile measurement of Grounding Resistance value, one end redness plug of CT1 current clamp is inserted instrument C (H) interface, black plug inserts instrument E interface, one end blueness plug of CT2 current clamp is inserted instrument C1 interface, black plug inserts instrument C2 interface, two current clamps are clamped in tested loop, notice that two current clamp directions are wanted consistent and keep spacing to be more than 30cm, two current clamps must not exchange, and otherwise can produce error.
After connecting p-wire, interface function carries out selection, enter corresponding earth resistance pattern and start test, count down in test process instruction and the instruction of testing progress rod figure, stable data are shown after being completed, the grounding resistance R=Re+R1//R2//R3 of the most tested grounding body, when R1//R2//R3 < < during Re, can be approximately R ≈ Re.
(3) measurement of hidden earth mat physical parameter:
Interface chooses earth mat physical parameters measurement function, a clip of measuring instrument special measurement is connected on the ground stud that measuring instrument is subsidiary and inserts underground or clamps directly to (reliable ground) on shaft tower frame;Another clip is connected with the hidden earth mat down conductor of shaft tower lightning protection.As shown in figure 12.
Then opening handheld terminal and receive device, measuring instrument is combined with gps satellite location technology and electromagnetic induction principle carries out the overall path trend of hidden earth mat, radical and the corresponding measurement of embedment ground depth value, is completed selection and preserves and return the upper level page.Measuring instrument is closed after being all completed.
(4) data derivation backstage diagnostic system:
All data that are completed preserve, using SD card or UPS interface that test result is downloaded to integrated diagnostic system, the comprehensive diagnos report forming the technical specification relevant with regard to earth resistance, soil resistivity and hidden design the laying degree of depth, length etc. is had access to or prints archive by system.
The error comprehensive diagnosis method of a kind of high pressure shaft tower lightning protection reliability of the present invention is to combine existing powerline pole tower ground resistance measurement technology, soil resistivity, the transmission tower earth mat degree of depth and move towards measurement technology and GPS positioning analysis technology and the system thunder defending Reliability Synthesis diagnostic method of a kind of comprehensive and reasonable that proposes.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing description of the invention and embodiment content to be made or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, the most in like manner it is included in the scope of patent protection of the present invention.

Claims (1)

1. the error comprehensive diagnosis method of a high pressure shaft tower lightning protection reliability, it is characterised in that: comprise the following steps:
(1) soil resistivity of the actual environment of measurement high pressure shaft tower:
Soil resistivity four-electrode method (Wenner method) measures, and calculates soil resistivity ρ according to formula ρ=2 π aR (Ω m), and unit is Ω m, wherein: a electrode spacing;The resistance of soil between R P (S)-ES electrode;
(2) measurement of grounding resistance:
Earth resistance is tested by four line precision measurement methods, three-terminals testing method, two wires easily-testing method, four line options method methods of testing, three line options method methods of testing, double pincers method method of testing;
(3) measurement of hidden earth mat physical parameter:
Measuring instrument interface chooses earth mat physical parameters measurement function, and a clip of measuring instrument special measurement is connected on the ground stud that measuring instrument is subsidiary and is inserted underground or clamps directly on shaft tower frame;Another clip is connected with the hidden earth mat down conductor of shaft tower lightning protection;Then open handheld terminal and receive device, measuring instrument is combined with gps satellite location technology and electromagnetic induction principle carries out the overall path trend of hidden earth mat, radical and the corresponding measurement of embedment ground depth value, it is completed selection preserve and return the upper level page, after being all completed, closes measuring instrument;
(4) data derivation backstage diagnostic system:
All data that are completed preserve, using SD card or UPS interface that test result is downloaded to integrated diagnostic system, the comprehensive diagnos report forming the technical specification relevant with regard to earth resistance, soil resistivity and hidden design the laying degree of depth, length etc. is had access to or prints archive by system.
CN201610386945.0A 2016-06-04 2016-06-04 High voltage support lightning protection reliability integrated diagnosis method CN106019013A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610386945.0A CN106019013A (en) 2016-06-04 2016-06-04 High voltage support lightning protection reliability integrated diagnosis method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610386945.0A CN106019013A (en) 2016-06-04 2016-06-04 High voltage support lightning protection reliability integrated diagnosis method

Publications (1)

Publication Number Publication Date
CN106019013A true CN106019013A (en) 2016-10-12

Family

ID=57089309

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610386945.0A CN106019013A (en) 2016-06-04 2016-06-04 High voltage support lightning protection reliability integrated diagnosis method

Country Status (1)

Country Link
CN (1) CN106019013A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106680632A (en) * 2016-12-30 2017-05-17 杭州后博科技有限公司 Iron tower lightning protection performance detection method based on electromagnetic radiation abnormity determination and system
CN109188538A (en) * 2018-09-27 2019-01-11 国网山西省电力公司电力科学研究院 Goaf electromechanical detection method under a kind of column foot
CN110161444A (en) * 2019-06-04 2019-08-23 三峡大学 It is a kind of to judge the whether effective method of powerline pole tower ground resistance measurement result

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1114689A (en) * 1997-06-26 1999-01-22 Toshiba Corp Leakage current sensitivity measuring apparatus of earth leakage breaker
CN102435918A (en) * 2011-09-14 2012-05-02 浙江省电力试验研究院 Large-current outdoor real model simulation test method for testing lightning impulse characteristics of grounding device
CN103293419A (en) * 2013-05-31 2013-09-11 华南理工大学 Evaluation method of grounding device impact performance
CN204177977U (en) * 2014-10-22 2015-02-25 福建优迪电力技术有限公司 A kind of GPS positioning system for earth mat current by pass proving installation
CN204989318U (en) * 2015-09-15 2016-01-20 福建优迪电力技术有限公司 Shaft tower ray path , soil rate and ground resistance measuring integrated analysis appearance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1114689A (en) * 1997-06-26 1999-01-22 Toshiba Corp Leakage current sensitivity measuring apparatus of earth leakage breaker
CN102435918A (en) * 2011-09-14 2012-05-02 浙江省电力试验研究院 Large-current outdoor real model simulation test method for testing lightning impulse characteristics of grounding device
CN103293419A (en) * 2013-05-31 2013-09-11 华南理工大学 Evaluation method of grounding device impact performance
CN204177977U (en) * 2014-10-22 2015-02-25 福建优迪电力技术有限公司 A kind of GPS positioning system for earth mat current by pass proving installation
CN204989318U (en) * 2015-09-15 2016-01-20 福建优迪电力技术有限公司 Shaft tower ray path , soil rate and ground resistance measuring integrated analysis appearance

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
姜宝琪: ""新型手持式接地电阻测试仪"", 《电世界》 *
李锦初: ""HT234E型接地电阻测试仪"", 《国外电子测量技术》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106680632A (en) * 2016-12-30 2017-05-17 杭州后博科技有限公司 Iron tower lightning protection performance detection method based on electromagnetic radiation abnormity determination and system
CN106680632B (en) * 2016-12-30 2021-01-08 杭州后博科技有限公司 Iron tower lightning protection performance detection method and system based on electromagnetic radiation abnormity judgment
CN109188538A (en) * 2018-09-27 2019-01-11 国网山西省电力公司电力科学研究院 Goaf electromechanical detection method under a kind of column foot
CN110161444A (en) * 2019-06-04 2019-08-23 三峡大学 It is a kind of to judge the whether effective method of powerline pole tower ground resistance measurement result

Similar Documents

Publication Publication Date Title
JP2020187148A (en) Search voltage transmitter or search current transmitter
Grcev Computer analysis of transient voltages in large grounding systems
CA2921822C (en) Borehole electric field survey with improved discrimination of subsurface features
US4438389A (en) Method for utilizing three-dimensional radiated magnetic field gradients for detecting serving faults in buried cables
CN101216523B (en) Substation grounding net defect diagnostic method and apparatus
CN103792433B (en) With the low amplitude value impulse resistance measuring method of spark coefficient correction tower grounding device
US7154281B2 (en) Apparatus and method for determining the status of an electric power cable
CN104678246B (en) A kind of grounding net of transformer substation etch state appraisal procedure and its system
CN100410675C (en) Power cable damage synchronous magnetic field directioning positioning method
CN102928673B (en) Method for acquiring impulse grounding resistance
CN106443313A (en) Rapid detection method for false wiring of high-voltage three-phase three-wire electric energy metering device
CN1234008C (en) Comprehensively measuring method and device for electric potentials of pipe earth and ground surface for cathodic pipeline pretection
WO2015074473A1 (en) Grounding grid breakpoint diagnostic method for transient electromagnetic method
US8593152B2 (en) Earth ground tester with remote control
CN101183133A (en) Phase amount and zero sequence amount combined realization powerline both-end distance measuring method
CN105021953B (en) Grounding net of transformer substation corrosion detection system and method based on earth&#39;s surface magnetic induction intensity
TWI442062B (en) Method of measuring earth ground resistance of a pylon using a single clamp
CN201138368Y (en) Defect diagnostic equipment for substation grounding grid
CN105699816A (en) AC charging post calibration device
CN106597568A (en) Large-scale drainage pipe culvert positioning method
CN104898024B (en) The Failure Diagnosis of Substation Ground Network method of comprehensive surface potential and magnetic induction intensity
CN103135137B (en) A kind of grounded screen topology detection method based on the differential method
Furse et al. Feasibility of reflectometry for nondestructive evaluation of prestressed concrete anchors
RU2624614C2 (en) Test system of dynamic modeling of electromagnetic transition process of thunderstorm
CN106324687B (en) A kind of buried irony pipeline detection and accurate positioning method

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20161012