CN202710673U - Conductor position and grid structure detection system for transformer station grounding network - Google Patents
Conductor position and grid structure detection system for transformer station grounding network Download PDFInfo
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- CN202710673U CN202710673U CN 201220167792 CN201220167792U CN202710673U CN 202710673 U CN202710673 U CN 202710673U CN 201220167792 CN201220167792 CN 201220167792 CN 201220167792 U CN201220167792 U CN 201220167792U CN 202710673 U CN202710673 U CN 202710673U
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Abstract
The utility model relates to a conductor and grid structure detection system for a transformer station grounding network. The system consists of a detection signal generating part and a signal detection part, wherein the detection signal generating part is a constant current source; a sine wave working way is adopted for a current source; the signal output end of the current source is connected between two lower guide bodies of the grounding network; the signal detection part comprises a detection coil L, a distance measuring pulse generating circuit, a signal processing circuit and an acquisition analysis system C; the signal output end of the detection coil L is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is connected with the input end of the acquisition analysis system; and the output end of distance measuring pulse is connected with the triggering input end of a data acquisition card. The system has a simple structure, can be used for rapidly and accurately detecting the underground conductor, position and structure of the transformer station grounding network in the case that the transformer station operates normally, and can meet the measurement and detection requirements of a practical field.
Description
Technical field
The utility model belongs to the detection technique field, be specifically related to a kind of can be in the situation that the normal operation of transformer station, efficient, easy, survey the position of grounding net of transformer substation ground lower conductor and the detection system of network exactly.
Background technology
Grounded screen plays a very important role substation safety is in service; it not only provides a public reference ground for various electrical equipments in the transformer station; can also drain rapidly fault current in the system failure or when being struck by lightning and reduce earth potential liter in the transformer station, the safety of staff's personal safety and various electrical equipments and normally moving in the protection transformer station.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, in order to realize all pressure, diffusing and reduce the effect of stake resistance, have earth conductor to link to each other with the electrical equipment on ground at different grid position places as required.When transformer station is short-circuited or the fault such as be struck by lightning; the large electric current of moment is dispensed into ground through grounded screen; stake resistance is less; the potential rise of grounded screen is just lower; the current potential of the current potential on surface and the electrical equipment that links to each other with grounded screen is just low in this wise, thereby protects the personal safety of staff in electrical equipment and the transformer station.But, owing to reasons such as corrosion, may 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 Practical Project, run into sometimes grounded screen drawing and actual laying and exist deviation, drawing to lose or damaged situation, thereby bring great difficulty for the condition diagnosing of grounded screen and security performance assessment.At this moment, usually excavate inspection by large tracts of land, waste a large amount of human and material resources and financial resources.
The utility model content
The purpose of this utility model just is to provide a kind of position of grounding net of transformer substation ground lower conductor and detection system of network surveyed, it has overcome the deficiencies in the prior art, use easy and simple to handlely, can realize Measurement accuracy grounding net of transformer substation conductor position and network.
Realize what above-mentioned utility model purpose the utility model adopted
Technical schemeFor:
A kind of grounding net of transformer substation conductor position and network detection system, it comprises detectable signal generating means and the signal detecting device that detectable signal is surveyed, and described detectable signal generating means is for adopting the current source 4 for generation magnetic induction density between two lower guide body line places that are connected on grounded screen ground surface location-appropriate of sinusoidal wave working method; Described 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 described 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 utility model is surveyed the trigger switch K on the trundle and is located at power supply E and the resistance R of surveying in the dolly by comprising being installed in, 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 utility model 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 described the first operational amplifier U1, the output terminal of the first operational amplifier U1 connects the pin one of wave filter MF by 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 by resistance R 4, the pin 3 of wave filter MF is by resistance R 3 ground connection, the pin 3 of the second operational amplifier U2 is successively by resistance R 4, R3 ground connection, operational amplifier U1,1 of U2, meet respectively regulating resistance R1 between 8 pins, R6 is connected to 1 of amplifier, between 8 pins, 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.
The utility model grounding net of transformer substation conductor and network detection system, described current source adopts HAC-100A-50V sine wave AC source, bandpass filter MF adopts the MF-300 mechanical filter, and described operational amplifier U1, U2 adopt AD620, and described data collecting card adopts PCI2322.The software systems that are arranged in the utility model in the acquisition analysis system are based on data capture card and notebook Terminal Design, gather, record and analyze when utilizing the Labview language platform to realize magnetic induction density signal and ranging information.
Of the present utility model
Beneficial effectFor:
The utility model is used the sine-wave current source, directly to the grounded screen Injection Current, utilizes detecting coil and corresponding software systems to measure Injection Current and distributes at the magnetic induction density that ground surface excites, and the position of dolly surveyed in record simultaneously.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 in the situation that transformer station normally moves and do not excavate grounded screen, survey quickly and accurately the underground conductor position of grounded screen, judge grounded screen water mean pressure conductor grid structure, can satisfy the detection needs of Practical Project.This patent has solved the difficult problem of prior art, lays a good foundation for state-detection and the security performance assessment of grounded screen, has saved a large amount of human and material resources and financial resources.Adopt the utility model 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 utility model is under transformer station's complex electromagnetic environment, based on instrument amplifier and mechanical filtering technique, by with the adjusting that cooperates of current work signal frequency, can effectively suppress on-the-spot electromagnetic interference (EMI), avoid mainly disturbing frequency, make measuring accuracy and resolution can satisfy the detection requirement.
Innovation of the present utility model comprises following aspect:
1) adopt the sine-wave current source, by 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 earth's surface changes induced voltage signal into, under transformer station's complex electromagnetic environment, signal is carried out filtering, amplification and extraction process, and then obtain the magnetic induction density distribution that Injection Current excites on the earth's surface;
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 in the situation of grounded screen, according to the earth's surface magnetic induction density distribution characteristics and the rule that measure, quickly and accurately Underground grounded screen conductor position and network.
Description of drawings
Electric current injected connection diagram when Fig. 1 implemented detection method for the described detection system of employing the utility model embodiment;
Fig. 2 is for adopting the described detection system of the utility model embodiment to implement detection method magnetic-field measurement schematic diagram;
Fig. 3 is range-measuring circuit schematic diagram described in the utility model embodiment;
Fig. 4 is for being signal conditioning circuit schematic diagram described in the utility model embodiment;
Fig. 5 is software systems process flow diagram described in the utility model embodiment;
Fig. 6 is the utility model one specific embodiment magnetic induction density earth's surface distribution plan
Fig. 7 is the utility model one specific embodiment 220kV transformer station main grounding grid result of detection.
Each label is among the figure: 1, grounded screen, 2, lower guide body line, 3, ground surface, 4, current source, 5, the earth's surface 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 described in further detail.
The utility model embodiment grounding net of transformer substation conductor position and network detection system shown in Fig. 1,2,3,4,5, it comprises detectable signal generating means and signal detecting device, and described detectable signal generating means is for adopting the current source 4 for generation magnetic induction density between two lower guide body line places that are connected on grounded screen ground surface location-appropriate of sinusoidal wave working method; Described signal detecting device comprise one as shown in Figure 2 detection dolly 6 and be 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 described 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 utility model is surveyed the trigger switch K on the trundle and is located at power supply E and the resistance R of surveying in the dolly 6 by comprising being installed in, K switch, power supply E and resistance R series connection, the pulse output end of range-measuring circuit connects the triggering input end of data collecting card.
Signal conditioning circuit described in the utility model 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 described the first operational amplifier U1, the output terminal of the first operational amplifier U1 connects the pin one of wave filter MF by 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 by resistance R 4, the pin 3 of wave filter MF is by resistance R 3 ground connection, the pin 3 of the second operational amplifier U2 is successively by resistance R 4, R3 ground connection, operational amplifier U1,1 of U2, meet respectively regulating resistance R1 between 8 pins, R6 is connected to 1 of amplifier, between 8 pins, 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 among the utility model embodiment, described current source adopts HAC-100A-50V sine wave AC source, bandpass filter MF adopts the MF-300 mechanical filter, described operational amplifier U1, U2 adopt AD620, and described data collecting card adopts PCI2322.Described 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 large current work state, satisfied the multiple needs of grounding net of transformer substation ground connection Performance Detection and fault diagnosis.
Be depicted as the detection method of wiping with the utility model grounding net of transformer substation conductor position and network detection system such as accompanying drawing 1,2, the steps include:
1, utilizes ground surface 3 existing lower guide body lines 2,2 on two lower guide body lines at location-appropriate pass through earth's surface return wire 5 access sine-wave current sources 4, to grounded screen 1 Injection Current, described lower guide body line 2 refers to the lead wire of conductor that the equal crimping earth mat of level links to each other with ground surface equipment, the principle of described 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 two upper guide body lines 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 or near two of straight line upper guide body lines as far as possible, 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, make up the rectangular coordinate system of a horizontal direction take the electric current decanting point as initial point;
3, respectively along x and y orientation measurement ground surface magnetic induction density, and record simultaneously the position coordinates that peak value occurs, 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 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 feature that presents the wave variation, peak value of the every corresponding appearance in conductor top, the place that peak value namely occurs, the underground conductor that exists of its correspondence can be judged buried conductor position and grounded screen network accordingly.
The utility model combines with the range finding location survey earth's surface magnetic induction density with analysis, pass through software systems, distribution characteristics according to earth's surface magnetic induction density, explicitly lower conductor and network, its flow chart at first carries out initialization as shown in Figure 5, then create the filename of wish storage data, the mobile dolly of surveying, 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 automatic analysis measurement data according to foregoing technical scheme, is judged respectively the conductor position of x and y direction, and provides the position coordinates that conductor occurs, draws earth mat figure.
Adopt the utility model 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 utility model is:
Be illustrated in figure 6 as the y direction magnetic induction density regularity of distribution that measures at certain 220kV transformer station main grounding grid ground surface, because the ground surface magnetic induction density component distribution perpendicular to the conductor current direction has the feature 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 judge accordingly position and the distribution situation of grid conductor in the x-direction of ground lower 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 agent grid structure that detects.
Innovation of the present utility model comprises following aspect:
1) adopt the sine-wave current source, by 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 earth's surface changes induced voltage signal into, under transformer station's complex electromagnetic environment, signal is carried out filtering, amplification and extraction process, and then obtain the magnetic induction density distribution that Injection Current excites on the earth's surface;
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 in the situation of grounded screen, according to the earth's surface magnetic induction density distribution characteristics and the rule that measure, quickly and accurately Underground grounded screen conductor position and network;
The utility model is under transformer station's complex electromagnetic environment, based on instrument amplifier and mechanical filtering technique, by with the adjusting that cooperates of current work signal frequency, can effectively suppress on-the-spot electromagnetic interference (EMI), avoid mainly disturbing frequency, make measuring accuracy and resolution can satisfy the detection requirement.
Claims (4)
1. a grounding net of transformer substation conductor position and network detection system, it comprises detectable signal generating means and signal detecting device, and described detectable signal generating means is for adopting the current source 4 for generation magnetic induction density between two lower guide body line places that are connected on grounded screen ground surface location-appropriate of sinusoidal wave working method; Described 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 described 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 capture card, the acquisition analysis system of the output termination end of data collecting card.
2. a kind of grounding net of transformer substation conductor position according to claim 1 and network detection system, it is characterized in that: described range-measuring circuit is installed in the trigger switch K on the wheel of surveying dolly and is located at power supply E and the resistance R of surveying in the 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.
3. a kind of grounding net of transformer substation conductor position according to claim 1 and network detection system, it is characterized in that: described signal conditioning circuit 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 described the first operational amplifier U1, the output terminal of the first operational amplifier U1 connects the pin one of wave filter MF by 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 by resistance R 4, the pin 3 of wave filter MF is by resistance R 3 ground connection, the pin 3 of the second operational amplifier U2 is successively by resistance R 4, R3 ground connection, operational amplifier U1,1 of U2, meet respectively regulating resistance R1 between 8 pins, R6 is connected to 1 of amplifier, between 8 pins, 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.
4. a kind of grounding net of transformer substation conductor position according to claim 1 and network detection system, it is characterized in that: described current source adopts HAC-100A-50V sine wave AC source, bandpass filter MF adopts the MF-300 mechanical filter, described operational amplifier U1, U2 adopt AD620, and described data collecting card adopts PCI2322.
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| CN 201220167792 CN202710673U (en) | 2012-04-19 | 2012-04-19 | Conductor position and grid structure detection system for transformer station grounding network |
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| CN 201220167792 CN202710673U (en) | 2012-04-19 | 2012-04-19 | Conductor position and grid structure detection system for transformer station grounding network |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628964A (en) * | 2012-04-19 | 2012-08-08 | 河北省电力公司超高压输变电分公司 | Conductor position and grid structure detection system for transformer station grounding network |
| CN106597221A (en) * | 2016-12-15 | 2017-04-26 | 中国科学院沈阳自动化研究所 | Ground grid fault diagnosis method and system |
| CN107271934A (en) * | 2017-05-28 | 2017-10-20 | 西南交通大学 | A kind of grounded screen security state evaluation device and method based on magnetic effect |
| CN109581542A (en) * | 2018-12-19 | 2019-04-05 | 国家电网公司 | A kind of grounding net of transformer substation buried depth detection system and method based on induction view magnetoimpedance method |
| CN111538094A (en) * | 2020-06-05 | 2020-08-14 | 镇江市合力消防工程有限公司 | Underground metal pipeline positioning device and method |
-
2012
- 2012-04-19 CN CN 201220167792 patent/CN202710673U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628964A (en) * | 2012-04-19 | 2012-08-08 | 河北省电力公司超高压输变电分公司 | Conductor position and grid structure detection system for transformer station grounding network |
| CN102628964B (en) * | 2012-04-19 | 2014-07-16 | 国家电网公司 | Conductor position and grid structure detection system for transformer station grounding network |
| CN106597221A (en) * | 2016-12-15 | 2017-04-26 | 中国科学院沈阳自动化研究所 | Ground grid fault diagnosis method and system |
| CN107271934A (en) * | 2017-05-28 | 2017-10-20 | 西南交通大学 | A kind of grounded screen security state evaluation device and method based on magnetic effect |
| CN109581542A (en) * | 2018-12-19 | 2019-04-05 | 国家电网公司 | A kind of grounding net of transformer substation buried depth detection system and method based on induction view magnetoimpedance method |
| CN109581542B (en) * | 2018-12-19 | 2024-01-26 | 国家电网公司 | Substation grounding grid buried depth detection system and method based on induction apparent magnetic impedance method |
| CN111538094A (en) * | 2020-06-05 | 2020-08-14 | 镇江市合力消防工程有限公司 | Underground metal pipeline positioning device and method |
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