CN105911430A - Distribution network grounding grid corrosion state detection system - Google Patents
Distribution network grounding grid corrosion state detection system Download PDFInfo
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- CN105911430A CN105911430A CN201610295621.6A CN201610295621A CN105911430A CN 105911430 A CN105911430 A CN 105911430A CN 201610295621 A CN201610295621 A CN 201610295621A CN 105911430 A CN105911430 A CN 105911430A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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Abstract
The present invention discloses a distribution network grounding grid corrosion state detection system. The ground point corrosion acquisition module of the system is configured to convert magnetic induction intensity signals to induction voltage signals, a monitoring output unit extracts signals after the induction voltage signals are processed through a signal modulation module, a signal amplification module and a signal filtering module, a trap wave circuit is realized by a dual-T network, and the signal amplification module regulates the frequency at detection to avoid interference frequency points; and a grounding thickness calculation module is configured to detect the thickness margin to the grounding point for users reference and usage.
Description
Technical field
The present invention relates to distribution network field, particularly relate to a kind of distribution network ground net corrosion condition detecting system.
Background technology
In prior art, the measurement means for grounded screen fault point is more original, often according to the soil corrosion rate in area,
Empirically estimating grounding grids extent of corrosion, then sampling excavates inspection.This method is big, fast with blindness, workload
Degree is slow, and also is limited by on-the-spot service condition, it is impossible to judge extent of corrosion and breakpoint exactly.
Summary of the invention
In order to overcome above-mentioned deficiency of the prior art, it is an object of the invention to, it is provided that a kind of distribution network grounded screen
Etch state detecting system, including: excitation current source, earth point corrosion acquisition module, signal modulation module, signal filtering mould
Block, signal amplification module, monitoring output unit, earth point THICKNESS CALCULATION module；
Described excitation current source is to the ground nodes injection current of grounded screen；
Described earth point corrosion acquisition module is for being acquired the current potential of ground nodes；
Described signal modulation module corrodes, for receiving earth point, the earth point current potential that acquisition module gathers, and by earth point current potential
Signal is modulated；
Described signal filtering module signal after receiving the modulation of described signal modulation module, and be filtered；
Described signal amplification module is for being amplified filtered sampled signal；
Described monitoring output unit is for exporting the sampled signal after amplifying；
Described earth point corrosion acquisition module uses rectangular detection coil, and the size of rectangular detection coil is long 25 30cm, wide
8 10cm, 6,500 7000 circles；
Described earth point corrosion acquisition module magnetic induction signal is changed into induced voltage signal, through signal modulation module,
After signal amplification module and signal filtering resume module, monitoring output unit extracts signal, twin-T network realize trap circuit,
During detection, signal amplification module regulating frequency, with the frequency that avoids interference；
Described earth point THICKNESS CALCULATION module obtains grounding grids material for the design size according to grounded screen, shape data
Parameter；Detect this grounded screen section t at runtimei(i=1,2,3, i) in average corrosion rate vi；According to heat stability
And earth-fault protection determines that the design minimum of grounded screen allows thickness dmin；Utilize average corrosion rate viTo future time section
Average corrosion rate vi+1It is predicted, and according to average corrosion rate vi+1Calculate the residual thickness d of conductors；Judge dsWhether
Less than dmin, dsMore than dmin, then meet condition grounded screen and be continuing with；If dsLess than dmin, grounded screen is stopped using；
Described earth point THICKNESS CALCULATION module 7 is additionally operable to the accumulation corrosion depth calculation of grounding grids:；
The calculation of grounding grids residual thickness is: ds=d-dy；D is the design thickness of grounding grids.
Preferably, described signal amplification module includes: amplify resistance Rfd1, amplify resistance Rfd2, amplify resistance Rfd3, amplify
Resistance Rfd4, amplify resistance Rfd5, amplify electric capacity Cfd1, amplify electric capacity Cfd2, amplify electric capacity Cfd3, amplify electric capacity Cfd4, amplify two poles
Pipe Dfd1, amplify diode Dfd2, amplifying triode Qfd1, amplify inductance Lfd；
Signal filtering module inputs to described signal amplification module after being filtered by the signal of collection, and R1 plays buffer action,
Amplify inductance Lfd；With amplification electric capacity Cfd1Constituting shunt-resonant circuit, effective attenuation by absorption, also on the basis of mid frequency
Spread gathering signal, amplify electric capacity Cfd1For 2nF to 3nF, amplify inductance Lfd, L is 1.5mH to 2mH, in this scope
Inside there is good frequency-selective circuit, improve the sensitivity of carrier wave；Amplify diode Dfd1, amplify diode Dfd2Clamper is at 1V extremely
Between 1.5V, amplified electric capacity Cfd2Guide to amplifying triode Qfd1On emitter stage, carry out the amplification of signal, through amplification after,
Via amplifying electric capacity Cfd4Output carries out subsequent treatment.
Preferably, described monitoring output unit includes LCD MODULE, data memory module and human-computer interaction module；
Described LCD MODULE and human-computer interaction module realize the good man-machine interaction of whole system, described data storage mould
Block realizes gathering mass memory and the backup of data.
Preferably, also include: be arranged on the filter circuit between signal amplification module and monitoring output module；
Described filter circuit includes: resistance R11, resistance R12, resistance R13, resistance R15, resistance R16, resistance R17, regulation current potential
Device R14, regulator potentiometer R18, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6 and four operation amplifiers
Device.
Preferably, described monitoring output unit includes: communication module；Described communication module is connected with server communication, uses
Data after gathering upload onto the server.
As can be seen from the above technical solutions, the invention have the advantages that
Detecting system monitoring grounding net fault corrosion condition, has certain reliability and accuracy, and can be according to measuring reconnaissance
Principle and reconnaissance rule, reduce error and the precision of reconnaissance.By the monitoring of grounded screen being improve the safety that grounded screen is run
And the safety in production of stability, beneficially power system.The potential safety hazard that there is grounded screen can find in time, it is ensured that power supply
System properly functioning.
Accompanying drawing explanation
In order to be illustrated more clearly that technical scheme, will the accompanying drawing used required in describing be made simple below
Ground is introduced, it should be apparent that, the accompanying drawing in describing below is only some embodiments of the present invention, for ordinary skill
From the point of view of personnel, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit diagram before grounded screen topological structure simplifies；
Fig. 2 is the circuit diagram after grounded screen topological structure simplifies；
Fig. 3 is the circuit diagram before the simplification of grounded screen another embodiment of topological structure.
Detailed description of the invention
For making the goal of the invention of the present invention, feature, the advantage can be the most obvious and understandable, concrete by using below
Embodiment and accompanying drawing, be clearly and completely described the technical scheme of present invention protection, it is clear that enforcement disclosed below
Example is only a part of embodiment of the present invention, and not all embodiment.Based on the embodiment in this patent, the common skill in this area
All other embodiments that art personnel are obtained under not making creative work premise, broadly fall into the model of this patent protection
Enclose.
The present embodiment provides a kind of distribution network ground net corrosion condition detecting system, as it is shown in figure 1, include: excitation electricity
Stream source 1, earth point corrosion acquisition module 2, signal modulation module 3, signal filtering module 4, signal amplification module 5, monitoring output
Unit 6, earth point THICKNESS CALCULATION module 7；
Excitation current source 1 is to the ground nodes injection current of grounded screen；Earth point corrosion acquisition module 2 is for ground nodes
Current potential is acquired；Signal modulation module 3 corrodes, for receiving earth point, the earth point current potential that acquisition module gathers, and by ground connection
Point electric potential signal is modulated；The signal filtering module 4 signal after receiving signal molding block is modulated, and be filtered；
Signal amplification module 5 is for being amplified filtered sampled signal；Monitoring output unit 6 is for the sampling letter after amplifying
Number export；
Earth point corrosion acquisition module 2 uses rectangular detection coil, and the size of rectangular detection coil is long 25 30cm, wide by 8
10cm, 6,500 7000 circles；Magnetic induction signal is changed into induced voltage signal, through letter by earth point corrosion acquisition module 2
After number modulation module, signal amplification module and signal filtering resume module, monitoring output unit extracts signal, real by twin-T network
Existing trap circuit, during detection, signal amplification module regulating frequency, with the frequency that avoids interference；
Earth point THICKNESS CALCULATION module 7 obtains grounding grids material ginseng for the design size according to grounded screen, shape data
Number；Detect this grounded screen section t at runtimei(i=1,2,3, i) in average corrosion rate vi；According to heat stability and
Earth-fault protection determines that the design minimum of grounded screen allows thickness dmin；Utilize average corrosion rate viTo future time section
Average corrosion rate vi+1It is predicted, and according to average corrosion rate vi+1Calculate the residual thickness d of conductors；Judge dsThe least
In dmin, dsMore than dmin, then meet condition grounded screen and be continuing with；If dsLess than dmin, grounded screen is stopped using；Earth point thickness
Computing module 7 is additionally operable to the accumulation corrosion depth calculation of grounding grids:
The calculation of grounding grids residual thickness is: ds=d-dy；D is the design thickness of grounding grids.
Excitation current source, before sending exciting current, first calculates the magnetic induction that exciting current excites at ground surface, point
The analysis Soil structural properties impact on magnetic induction；Study applying exciting current direct to grounding net of transformer substation, by measuring
Ground surface Magnetic Induction Density Distribution, inspires the exciting current of correspondence.So can carry out earth point for complex electromagnetic environment
Corrosion monitoring.And utilize frequency-selecting amplifying technique can effectively suppress electromagnetic interference.
Owing to the ground connection of distribution system is that metallic conductor is welded, it is mostly mesh shape.Under alternating current effect,
For the resistance of conductor itself, its inductance is the least, additionally the direct-to-ground capacitance of grounding grids section and scatter admittance than
The much more resistive of conductor segment itself, therefore can regard the network of a pure resistive as by grounded screen, is adopted by earth point corrosion
The collection of collection module 2, under electromagnetic action, improves the effect to earth point corrosion monitoring, it is ensured that detection accurate.
In the present embodiment, as in figure 2 it is shown, signal amplification module 5 includes: amplify resistance Rfd1, amplify resistance Rfd2, amplify electricity
Resistance Rfd3, amplify resistance Rfd4, amplify resistance Rfd5, amplify electric capacity Cfd1, amplify electric capacity Cfd2, amplify electric capacity Cfd3, amplify electric capacity
Cfd4, amplify diode Dfd1, amplify diode Dfd2, amplifying triode Qfd1, amplify inductance Lfd；
Signal filtering module inputs after being filtered by the signal of collection to signal amplification module, and R1 plays buffer action, amplifies
Inductance Lfd；With amplification electric capacity Cfd1Constituting shunt-resonant circuit, effective attenuation by absorption, also to adopting on the basis of mid frequency
Collection signal spreads, and amplifies electric capacity Cfd1For 2nF to 3nF, amplify inductance Lfd, L is 1.5mH to 2mH, has in the range of this
There is good frequency-selective circuit, improve the sensitivity of carrier wave；Amplify diode Dfd1, amplify diode Dfd2Clamper 1V to 1.5V it
Between, amplified electric capacity Cfd2Guide to amplifying triode Qfd1On emitter stage, carry out the amplification of signal, through amplification after, via putting
Bulky capacitor Cfd4Output carries out subsequent treatment.
In the present embodiment, as it is shown on figure 3, also include: be arranged on the filter between signal amplification module and monitoring output module
Wave circuit；Filter circuit includes: resistance R11, resistance R12, resistance R13, resistance R15, resistance R16, resistance R17, regulation current potential
Device R14, regulator potentiometer R18, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6 and four operation amplifiers
Device.
Filter circuit have filtering, amplify, feed back, regulate, the operational amplifier of feedback function and there is regulatory function
Regulator potentiometer R14, regulator potentiometer R18.Wherein, regulator potentiometer R14, regulator potentiometer R18 are for regulating the product of circuit
Prime factor effect, quality factor are the biggest, and resistance band is the narrowest, and selecting frequency characteristic is the best, filter Hz noise effect the best.And pin
There are good inhibiting effect, filter circuit to contain two arrowband stopband center frequencies to power frequency second harmonic, the most permissible
Realize Independent adjustable value.It is achieved in that secondary filtering effect, it is ensured that the accuracy of sampled signal.
In the present embodiment, monitoring output unit includes: communication module；Communication module is connected with server communication, and being used for will
Data after collection upload onto the server.Monitoring output unit includes LCD MODULE, data memory module and man-machine interaction
Module；LCD MODULE and human-computer interaction module realize the good man-machine interaction of whole system, and data memory module realizes
Gather mass memory and the backup of data.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other
The difference of embodiment, identical similar portion reference mutually between each embodiment.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one
The widest scope caused.
Claims (5)
1. a distribution network ground net corrosion condition detecting system, it is characterised in that including: excitation current source, earth point are rotten
Erosion acquisition module, signal modulation module, signal filtering module, signal amplification module, monitoring output unit, earth point THICKNESS CALCULATION
Module；
Described excitation current source is to the ground nodes injection current of grounded screen；
Described earth point corrosion acquisition module is for being acquired the current potential of ground nodes；
Described signal modulation module corrodes, for receiving earth point, the earth point current potential that acquisition module gathers, and by earth point current potential
Signal is modulated；
Described signal filtering module signal after receiving the modulation of described signal modulation module, and be filtered；
Described signal amplification module is for being amplified filtered sampled signal；
Described monitoring output unit is for exporting the sampled signal after amplifying；
Described earth point corrosion acquisition module uses rectangular detection coil, and the size of rectangular detection coil is long 25 30cm, wide
8 10cm, 6,500 7000 circles；
Described earth point corrosion acquisition module magnetic induction signal is changed into induced voltage signal, through signal modulation module,
After signal amplification module and signal filtering resume module, monitoring output unit extracts signal, twin-T network realize trap circuit,
During detection, signal amplification module regulating frequency, with the frequency that avoids interference；
Described earth point THICKNESS CALCULATION module obtains grounding grids material for the design size according to grounded screen, shape data
Parameter；Detect this grounded screen section t at runtimei(i=1,2,3, i) in average corrosion rate vi；According to heat stability
And earth-fault protection determines that the design minimum of grounded screen allows thickness dmin；Utilize average corrosion rate viTo future time section
Average corrosion rate vi+1It is predicted, and according to average corrosion rate vi+1Calculate the residual thickness d of conductors；Judge dsWhether
Less than dmin, dsMore than dmin, then meet condition grounded screen and be continuing with；If dsLess than dmin, grounded screen is stopped using；
Described earth point THICKNESS CALCULATION module 7 is additionally operable to the accumulation corrosion depth calculation of grounding grids:；
The calculation of grounding grids residual thickness is: ds=d-dy；D is the design thickness of grounding grids.
Distribution network ground net corrosion condition detecting system the most according to claim 1, it is characterised in that
Described signal amplification module includes: amplify resistance Rfd1, amplify resistance Rfd2, amplify resistance Rfd3, amplify resistance Rfd4, amplify
Resistance Rfd5, amplify electric capacity Cfd1, amplify electric capacity Cfd2, amplify electric capacity Cfd3, amplify electric capacity Cfd4, amplify diode Dfd1, amplify two
Pole pipe Dfd2, amplifying triode Qfd1, amplify inductance Lfd；
Signal filtering module inputs to described signal amplification module after being filtered by the signal of collection, and R1 plays buffer action,
Amplify inductance Lfd；With amplification electric capacity Cfd1Constituting shunt-resonant circuit, effective attenuation by absorption, also on the basis of mid frequency
Spread gathering signal, amplify electric capacity Cfd1For 2nF to 3nF, amplify inductance Lfd, L is 1.5mH to 2mH, in this scope
Inside there is good frequency-selective circuit, improve the sensitivity of carrier wave；Amplify diode Dfd1, amplify diode Dfd2Clamper is at 1V extremely
Between 1.5V, amplified electric capacity Cfd2Guide to amplifying triode Qfd1On emitter stage, carry out the amplification of signal, through amplification after,
Via amplifying electric capacity Cfd4Output carries out subsequent treatment.
Distribution network ground net corrosion condition detecting system the most according to claim 1, it is characterised in that
Described monitoring output unit includes LCD MODULE, data memory module and human-computer interaction module；
Described LCD MODULE and human-computer interaction module realize the good man-machine interaction of whole system, described data storage mould
Block realizes gathering mass memory and the backup of data.
Distribution network ground net corrosion condition detecting system the most according to claim 1, it is characterised in that
Also include: be arranged on the filter circuit between signal amplification module and monitoring output module；
Described filter circuit includes: resistance R11, resistance R12, resistance R13, resistance R15, resistance R16, resistance R17, regulation current potential
Device R14, regulator potentiometer R18, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6 and four operation amplifiers
Device.
Distribution network ground net corrosion condition detecting system the most according to claim 1, it is characterised in that
Described monitoring output unit includes: communication module；Described communication module is connected with server communication, after gathering
Data upload onto the server.
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Cited By (5)
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| CN107015105A (en) * | 2017-05-28 | 2017-08-04 | 西南交通大学 | It is a kind of to detect vertical grounding electrode or the device and method of deep-well grounding validity |
| CN108801892A (en) * | 2018-06-19 | 2018-11-13 | 国家电网公司 | Grounding net of transformer substation corrosion diagnosis method and system |
| CN109580722A (en) * | 2018-12-25 | 2019-04-05 | 国网陕西省电力公司电力科学研究院 | A kind of ground net corrosion monitoring method and device based on AC admittance method |
| CN109580463A (en) * | 2018-11-22 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | A method of measurement ground net corrosion degree |
| CN112345442A (en) * | 2020-09-30 | 2021-02-09 | 中核核电运行管理有限公司 | Magnetic attraction type lead joint device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107015105A (en) * | 2017-05-28 | 2017-08-04 | 西南交通大学 | It is a kind of to detect vertical grounding electrode or the device and method of deep-well grounding validity |
| CN107015105B (en) * | 2017-05-28 | 2019-05-03 | 西南交通大学 | A kind of device and method detecting vertical grounding electrode or deep-well grounding validity |
| CN108801892A (en) * | 2018-06-19 | 2018-11-13 | 国家电网公司 | Grounding net of transformer substation corrosion diagnosis method and system |
| CN108801892B (en) * | 2018-06-19 | 2020-09-29 | 国家电网公司 | Transformer substation grounding grid corrosion diagnosis method and system |
| CN109580463A (en) * | 2018-11-22 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | A method of measurement ground net corrosion degree |
| CN109580463B (en) * | 2018-11-22 | 2021-08-20 | 国网天津市电力公司电力科学研究院 | Method for measuring corrosion degree of grounding grid |
| CN109580722A (en) * | 2018-12-25 | 2019-04-05 | 国网陕西省电力公司电力科学研究院 | A kind of ground net corrosion monitoring method and device based on AC admittance method |
| CN109580722B (en) * | 2018-12-25 | 2021-07-06 | 国网陕西省电力公司电力科学研究院 | Grounding grid corrosion monitoring method and device based on alternating current admittance method |
| CN112345442A (en) * | 2020-09-30 | 2021-02-09 | 中核核电运行管理有限公司 | Magnetic attraction type lead joint device |
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