CN102628903A - Method for detecting conductor position and grid structure of transformer station grounding network - Google Patents
Method for detecting conductor position and grid structure of transformer station grounding network Download PDFInfo
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- CN102628903A CN102628903A CN2012101160456A CN201210116045A CN102628903A CN 102628903 A CN102628903 A CN 102628903A CN 2012101160456 A CN2012101160456 A CN 2012101160456A CN 201210116045 A CN201210116045 A CN 201210116045A CN 102628903 A CN102628903 A CN 102628903A
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Abstract
Description
Technical field
The invention belongs to the detection technique field, be specifically related to a kind of can be under the situation of the normal operation of transformer station, efficient, easy, survey the position of grounding net of transformer substation ground lower conductor and the detection method of network exactly.
Background technology
Grounded screen plays crucial effect in that substation safety is in service; It is not merely, and various electrical equipments provide a public reference ground in the transformer station; Can also drain fault current rapidly and reduce the earth potential liter in the transformer station in the system failure or when being struck by lightning, in the protection transformer station safety of staff's personal safety and various electrical equipments with normally move.Earthing device is generally latticed grounding body; Usually utilize band steel, round steel, angle steel, steel pipe or copper material etc. to be welded to form grid; This grid usually is embedded in underground 0.6～1 meter degree of depth; So that the effect that realization is all pressed, loose and flow and reduce stake resistance has earth conductor to link to each other with the electrical equipment on ground as required in the different grid position.When transformer station is short-circuited or fault such as be struck by lightning; The big electric current of moment is dispensed into ground through grounded screen; Stake resistance is more little; The potential rise of grounded screen is just low more, and the current potential of surperficial in this wise current potential and the electrical equipment that links to each other with grounded screen is just low, thus staff's personal safety in protection electrical equipment and the transformer station.But, owing to reasons such as corrosion, possibly cause the grid conductor to attenuate or breakpoint occurs, destroyed the original structure of grounded screen, reduced the ground connection performance, lost defencive function.
The design of grounded screen and laying drawing are to search grounded screen breakpoint and heavy corrosion section; And the prerequisite of carrying out the security performance assessment; In actual engineering; Run into the grounded screen drawing sometimes and exist deviation, drawing to lose or damaged situation, thereby bring great difficulty for the condition diagnosing of grounded screen and security performance assessment with actual the laying.At this moment, usually excavate inspection, waste great amount of manpower and material resources and financial resources through large tracts of land.
Summary of the invention
The object of the invention just is to provide a kind of position of grounding net of transformer substation ground lower conductor and detection method of network surveyed, and it has overcome the deficiency of prior art, and is easy and simple to handle, can realize accurately measuring grounding net of transformer substation conductor position and network.
Realize what the present invention of foregoing invention purpose adopted Technical schemeFor:
A kind of grounding net of transformer substation conductor position and network detection method the steps include:
1, utilizes the existing guide body line down of ground surface; Between two following guide body lines of location-appropriate, insert the sine-wave current source; To the grounded screen injection current; Said lead wire of conductor is meant the lead wire of conductor that the equal crimping earth mat of level links to each other with ground surface equipment, and the principle of said its selection of location-appropriate is: survey the ground lower conductor of North and South direction, then select east-west direction to be in line as far as possible or go up the guide body lines near two of straight line; Survey the ground lower conductor of east-west direction; Then select North and South direction to be in line as far as possible or near two of straight line go up the guide body lines (because; The magnetic induction density component that is perpendicular to the conductor branches electric current that we measure at ground surface is as the criterion of judging that whether the ground lower conductor exists);
2, be the rectangular coordinate system that initial point makes up a horizontal direction with the electric current decanting point;
3,, and note the position coordinates that peak value occurs simultaneously respectively along x and y orientation measurement ground surface magnetic induction density;
4, according to measurement result; According to the anti-grounded screen structure that pushes away of peak value coordinate; And draw out the grounded screen structural drawing: the ground surface magnetic induction density component distribution perpendicular to the conductor current direction has the characteristic that presents the wave variation, and a peak value appears in every conductor top correspondence, the place of peak value promptly occurs; The underground conductor that exists that it is corresponding can be judged buried conductor position and grounded screen network in view of the above.
A kind of grounding net of transformer substation conductor position that said method is invented according to the present invention and network detection system; It comprises detectable signal generating means and signal detecting device, and said detectable signal generating means is used to be connected on the current source 4 that produces magnetic induction density between two following guide body line places of grounded screen ground surface location-appropriate for what adopt sinusoidal wave working method; Said signal detecting device comprises that one surveys dolly 6 and is installed in range-measuring circuit, detecting coil, signal conditioning circuit and data collecting card and the signal processing and analysis system 7 that surveys on the dolly; The signal output part of said detecting coil connects the input end of signal conditioning circuit; The signal input part of the output termination data collecting card of signal conditioning circuit; The range finding pulse of range-measuring circuit output connects the triggering input end of data collecting card, the acquisition analysis system of the output termination end of data collecting card.
Range-measuring circuit described in the present invention is installed in the trigger switch K that surveys on the trundle and the power supply E and the resistance R that are located in the detection dolly by comprising, K switch, power supply E and resistance R series connection, the triggering input end of circuit pulse output termination data collecting card.
Signal conditioning circuit described in the present invention comprises the first operational amplifier U1, the one or two operational amplifier U2, wave filter MF and respective resistive elements, all is connected into voltage follower; The input termination detecting coil of the said first operational amplifier U1; The output terminal of the first operational amplifier U1 connects the pin one of wave filter MF through resistance R 2; The pin two ground connection of wave filter MF; The pin 3 of wave filter MF connects the pin 3 of the second operational amplifier U2 through resistance R 4; The pin 3 of wave filter MF is through resistance R 3 ground connection, and the pin 3 of the second operational amplifier U2 is successively through resistance R 4, R3 ground connection, connects respectively between 1,8 pins of operational amplifier U1, U2 and regulates resistance R 1, R6 is connected between 1,8 pins of amplifier; Resistance R 2 is connected between the first operational amplifier U1 and the wave filter MF, and the output terminal of the second operational amplifier U2 connects the input port of acquisition analysis system through resistance R 7.
Grounding net of transformer substation conductor of the present invention and network detection system; Said current source adopts HAC-100A-50V sine wave AC source; BPF. MF adopts the MF-300 mechanical filter, and said operational amplifier U1, U2 adopt AD620, and said data collecting card adopts PCI2322.The software systems that are arranged among the present invention in the acquisition analysis system are based on data collecting card and notebook Terminal Design, gather, write down and analyze when utilizing the Labview language platform to realize magnetic induction density signal and ranging information.
Of the present invention Beneficial effectFor:
The present invention uses the sine-wave current source, directly to the grounded screen injection current, utilizes detecting coil and corresponding software system to measure injection current and distributes at the magnetic induction density that ground surface excites, and the position of dolly surveyed in record simultaneously.The distribution characteristics and the rule of base area surface induction intensity are judged buried grounded screen conductor position and are all pressed the conductor grid structure.This patent is easy and simple to handle; Under transformer station's complex electromagnetic environment, can and not excavate under the situation of grounded screen in the normal operation of transformer station, survey the underground conductor position of grounded screen quickly and accurately; Judge grounded screen water mean pressure conductor grid structure, can satisfy the detection needs of actual engineering.This patent has solved the difficult problem of prior art, lays a good foundation for the state-detection and the security performance assessment of grounded screen, has saved great amount of manpower and material resources and financial resources.Adopt the present invention to carry out on-the-spot test at analogue ground net and a plurality of transformer station, its result of detection is very consistent with actual conditions, and error can fast and effeciently be sought the underground conductor position of grounded screen in 5%, and then judges the grounded screen network.
The present invention is under transformer station's complex electromagnetic environment; Based on instrument amplifier and mechanical filtering technique, through with the fit adjustment of current work signal frequency, can suppress on-the-spot electromagnetic interference (EMI) effectively; Avoid mainly disturbing frequency, make measuring accuracy and resolution can satisfy the detection requirement.
Innovation of the present invention comprises following aspect:
1) adopt the sine-wave current source, through twice guide body of grounding net of transformer substation, direct injection current;
2) based on electromagnetic induction principle; Utilize and survey dolly (range-measuring circuit, detecting coil, signal conditioning circuit, data collecting card, software systems); The magnetic induction density that grounded screen grid conductor is excited on the face of land changes induced voltage signal into; Under transformer station's complex electromagnetic environment, signal is carried out filtering, amplification and extraction handle, and then obtain the magnetic induction density distribution that injection current excites on the face of land;
3) measurement of ground surface magnetic induction density and the synchro measure of detection dolly displacement have been realized.
4) do not have a power failure in transformer station, do not excavate under the situation of grounded screen,, survey underground grounded screen conductor position and network quickly and accurately according to the face of land magnetic induction density distribution characteristics and the rule that measure.
Description of drawings
Fig. 1 is that the said electric current of the embodiment of the invention injects the connection synoptic diagram;
Synoptic diagram when Fig. 2 is embodiment of the invention magnetic-field measurement;
Fig. 3 is that the embodiment of the invention is said for the range-measuring circuit schematic diagram;
Fig. 4 is the said signal conditioning circuit schematic diagram of the embodiment of the invention;
Fig. 5 is the said software systems process flow diagram of the embodiment of the invention;
Fig. 6 is the present invention's one specific embodiment magnetic induction density face of land distribution plan;
Fig. 7 is the present invention's one specific embodiment 220kV power transformation station owner grounded screen result of detection.
Each label is among the figure: 1, grounded screen, 2, following guide body line, 3, ground surface, 4, current source, 5, face of land return wire, 6, survey dolly, 7, terminal monitor, U, instrument amplifier, MF, mechanical filter, R1～R7, resistance.
Embodiment
Below in conjunction with accompanying drawing patent is done further to detail.
Like accompanying drawing 1, a kind of grounding net of transformer substation conductor position of the embodiment of the invention shown in 2 and network detection method, the steps include:
1, utilizes ground surface 3 existing guide body lines 2 down; 2 on two following guide body lines at location-appropriate pass through face of land return wire 5 access sine-wave current sources 4; To grounded screen 1 injection current; Said down guide body line 2 is meant the lead wire of conductor that the equal crimping earth mat of level links to each other with ground surface equipment, and the principle of said its selection of location-appropriate is: survey the ground lower conductor of North and South direction, then select east-west direction to be in line or near guide body lines on two of straight line as far as possible; Survey the ground lower conductor of east-west direction, then select North and South direction to be in line as far as possible or go up the guide body lines near two of straight line;
2, be the rectangular coordinate system that initial point makes up a horizontal direction with the electric current decanting point;
3, respectively along x and y orientation measurement ground surface magnetic induction density, and note the position coordinates that peak value occurs simultaneously, adopt the dolly 6 that is equipped with signal detecting device to realize the measurement of ground surface magnetic induction density and the synchro measure of detection dolly displacement;
4, according to measurement result; According to the anti-grounded screen structure that pushes away of peak value coordinate; And draw out the grounded screen structural drawing: the ground surface magnetic induction density component distribution perpendicular to the conductor current direction has the characteristic that presents the wave variation, and a peak value appears in every conductor top correspondence, the place of peak value promptly occurs; The underground conductor that exists that it is corresponding can be judged buried conductor position and grounded screen network in view of the above.
Like Fig. 1,2,3,4, the grounding net of transformer substation conductor position of the embodiment of the invention shown in 5 and network detection system; It comprises detectable signal generating means and signal detecting device, and said detectable signal generating means is used to be connected on the current source 4 that produces magnetic induction density between two following guide body line places of grounded screen ground surface location-appropriate for what adopt sinusoidal wave working method; Said signal detecting device comprises a detection dolly as shown in Figure 26 and is installed in range-measuring circuit, detecting coil, signal conditioning circuit and data collecting card and the signal processing and analysis system that surveys on the dolly; The signal output part of said detecting coil connects the input end of signal conditioning circuit; The signal input part of the output termination data collecting card of signal conditioning circuit; The range finding pulse of range-measuring circuit output connects the triggering input end of data collecting card, the acquisition analysis system of the output termination end of data collecting card.
Range-measuring circuit described in the present invention is installed in the trigger switch K that surveys on the trundle and the power supply E and the resistance R that are located in the detection dolly 6 by comprising, K switch, power supply E and resistance R series connection, and the pulse output end of range-measuring circuit connects the triggering input end of data collecting card.
Signal conditioning circuit described in the present invention comprises the first operational amplifier U1, the one or two operational amplifier U2, wave filter MF and respective resistive elements, all is connected into voltage follower; The input termination detecting coil of the said first operational amplifier U1; The output terminal of the first operational amplifier U1 connects the pin one of wave filter MF through resistance R 2; The pin two ground connection of wave filter MF; The pin 3 of wave filter MF connects the pin 3 of the second operational amplifier U2 through resistance R 4; The pin 3 of wave filter MF is through resistance R 3 ground connection, and the pin 3 of the second operational amplifier U2 is successively through resistance R 4, R3 ground connection, connects respectively between 1,8 pins of operational amplifier U1, U2 and regulates resistance R 1, R6 is connected between 1,8 pins of amplifier; Resistance R 2 is connected between the first operational amplifier U1 and the wave filter MF, and the output terminal of the second operational amplifier U2 connects the input port of acquisition analysis system through resistance R 7.
Grounding net of transformer substation conductor and network detection system in the embodiment of the invention; Said current source adopts HAC-100A-50V sine wave AC source; BPF. MF adopts the MF-300 mechanical filter, and said operational amplifier U1, U2 adopt AD620, and said data collecting card adopts PCI2322.Said current source adopts sinusoidal wave working method; Frequency of operation adopts in 200～1kHz scope all can; Output current 0～50A, loading range 0.2～10 Ω, general power 5kW; Can continuous working under big current work state, satisfied the multiple needs of grounding net of transformer substation ground connection Performance Detection and fault diagnosis.
The present invention combines with the range finding location survey face of land magnetic induction density with analysis; Through software systems,, show ground lower conductor and network according to the distribution characteristics of face of land magnetic induction density; Its flow chart is as shown in Figure 5 at first to carry out initialization; Create the filename of desire storage data then, move and survey dolly, the switch activated range finding pulsing circuit on the wheel produces trigger pulse; Under the triggering of this pulse, data collecting card synchronous acquisition magnetic induction density signal also stores in the preassigned data file.After measuring end, the analysis to measure data according to foregoing technical scheme, are judged the conductor position of x and y direction respectively, and are provided the position coordinates that conductor occurs automatically, draw earth mat figure.
Adopt the present invention to carry out on-the-spot test at analogue ground net and a plurality of transformer station, its result of detection is very consistent with actual conditions, and error can fast and effeciently be sought the underground conductor position of grounded screen in 5%, and then judges the grounded screen network.
An application example of the present invention is:
Be illustrated in figure 6 as the y direction magnetic induction density regularity of distribution that measures at certain 220kV power transformation station owner grounded screen ground surface; Because the ground surface magnetic induction density component distribution perpendicular to the conductor current direction has the characteristic that wave changes; Peak value of the every corresponding appearance in conductor top; Otherwise; The rule that each peak value below will have a conductor to exist can be judged the position of ground lower conductor and in view of the above along the distribution situation of x direction grid conductor, the distribution situation that similarly also can judge the position of x direction conductor and grind y direction grid conductor.Fig. 7 is the grounded screen main body network that detects.
Innovation of the present invention comprises following aspect:
1) adopt the sine-wave current source, through twice guide body of grounding net of transformer substation, direct injection current;
2) based on electromagnetic induction principle; Utilize and survey dolly (range-measuring circuit, detecting coil, signal conditioning circuit, data collecting card, software systems); The magnetic induction density that grounded screen grid conductor is excited on the face of land changes induced voltage signal into; Under transformer station's complex electromagnetic environment, signal is carried out filtering, amplification and extraction handle, and then obtain the magnetic induction density distribution that injection current excites on the face of land;
3) measurement of ground surface magnetic induction density and the synchro measure of detection dolly displacement have been realized.
4) do not have a power failure in transformer station, do not excavate under the situation of grounded screen,, survey underground grounded screen conductor position and network quickly and accurately according to the face of land magnetic induction density distribution characteristics and the rule that measure.
The present invention is under transformer station's complex electromagnetic environment; Based on instrument amplifier and mechanical filtering technique, through with the fit adjustment of current work signal frequency, can suppress on-the-spot electromagnetic interference (EMI) effectively; Avoid mainly disturbing frequency, make measuring accuracy and resolution can satisfy the detection requirement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101160456A CN102628903A (en) | 2012-04-19 | 2012-04-19 | Method for detecting conductor position and grid structure of transformer station grounding network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101160456A CN102628903A (en) | 2012-04-19 | 2012-04-19 | Method for detecting conductor position and grid structure of transformer station grounding network |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103135137A (en) * | 2013-03-13 | 2013-06-05 | 重庆大学 | Grounding grid topological structure detection method based on differential method |
| CN104897996A (en) * | 2015-06-10 | 2015-09-09 | 国网上海市电力公司 | Transformer station grounding network corrosion diagnosis method based on magnetic field inverse problem solving |
| CN105911430A (en) * | 2016-05-06 | 2016-08-31 | 国网山东省电力公司滨州市滨城区供电公司 | Distribution network grounding grid corrosion state detection system |
| CN105823933B (en) * | 2016-03-21 | 2018-09-18 | 南京信息职业技术学院 | A kind of infinitesimal for grounding net of transformer substation Corrosion monitoring divides detection method |
| CN108845234A (en) * | 2018-09-05 | 2018-11-20 | 清华大学深圳研究生院 | Grounded screen condition detecting device and the detection method for applying it |
| CN109324241A (en) * | 2017-08-01 | 2019-02-12 | 国网辽宁省电力有限公司电力科学研究院 | A kind of grounding net of transformer substation corrosion diagnosis method for early warning and system |
| CN110161365A (en) * | 2019-06-26 | 2019-08-23 | 国网上海市电力公司 | A kind of Fault Diagnosis for Grounding Grids method and system based on electromagnetic parameter feature |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103135137A (en) * | 2013-03-13 | 2013-06-05 | 重庆大学 | Grounding grid topological structure detection method based on differential method |
| CN103135137B (en) * | 2013-03-13 | 2015-11-18 | 重庆大学 | A kind of grounded screen topology detection method based on the differential method |
| CN104897996A (en) * | 2015-06-10 | 2015-09-09 | 国网上海市电力公司 | Transformer station grounding network corrosion diagnosis method based on magnetic field inverse problem solving |
| CN105823933B (en) * | 2016-03-21 | 2018-09-18 | 南京信息职业技术学院 | A kind of infinitesimal for grounding net of transformer substation Corrosion monitoring divides detection method |
| CN105911430A (en) * | 2016-05-06 | 2016-08-31 | 国网山东省电力公司滨州市滨城区供电公司 | Distribution network grounding grid corrosion state detection system |
| CN109324241A (en) * | 2017-08-01 | 2019-02-12 | 国网辽宁省电力有限公司电力科学研究院 | A kind of grounding net of transformer substation corrosion diagnosis method for early warning and system |
| CN108845234A (en) * | 2018-09-05 | 2018-11-20 | 清华大学深圳研究生院 | Grounded screen condition detecting device and the detection method for applying it |
| CN110161365A (en) * | 2019-06-26 | 2019-08-23 | 国网上海市电力公司 | A kind of Fault Diagnosis for Grounding Grids method and system based on electromagnetic parameter feature |
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