CN105182183A - Method for remotely detecting corrosion state of horizontal voltage equalizing conductor of transformer substation grounding grid - Google Patents
Method for remotely detecting corrosion state of horizontal voltage equalizing conductor of transformer substation grounding grid Download PDFInfo
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- CN105182183A CN105182183A CN201510615531.6A CN201510615531A CN105182183A CN 105182183 A CN105182183 A CN 105182183A CN 201510615531 A CN201510615531 A CN 201510615531A CN 105182183 A CN105182183 A CN 105182183A
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Abstract
The present invention relates to a method for remotely detecting the corrosion state of a horizontal voltage equalizing conductor of a transformer substation grounding grid. The present invention aims to solve problems existed in a current method for detecting breakpoint and corrosion state of a grounding grid, such as heavy workload, low accuracy and complex operation. The method for remotely detecting corrosion state of the horizontal voltage equalizing conductor of the transformer substation grounding grid includes the steps as follows: 1) injecting a sine-wave current signal of about 400Hz and 5-50A into a buried latticed horizontal voltage equalizing grounding grid through two upper guiding lines by utilizing a low voltage and high current AC constant current source; 2) performing rapid cruising on the surface of the grounding grid by remotely controlling a magnetic signal detecting and collecting device carried by an unmanned helicopter so as to collect data; 3) transmitting the spatial data information and synchronously-collected magnetic data information to a back-end terminal computer system by a BDS and GPS double mode system carried by the unmanned helicopter and a data wireless transmitting system; 4) detecting the ground magnetic field of the whole grounding grid so as to acquire a ground magnetic field overall distribution diagram; 5) summarizing and analyzing data, and outputting a diagnosis result.
Description
Technical field
The present invention relates to a kind of grounding net of transformer substation water mean pressure conductor etch state remote control detection method.
Background technology
Grounded screen is the necessary facility of power transmission and distribution project transformer station; grounded screen plays a very important role in safe operation of power system; first be need of work; for the various electrical equipments in transformer station provide a public reference ground; also be the needs of safeguard protection in addition; when there is short trouble or be struck by lightning in electric system, the fault current reduce the earth potential liter of protected area of releasing rapidly, the personal safety of protection staff and the safety of various electrical equipment and normally to run.The grounded screen of transformer station utilizes the material such as band steel or round steel to be welded to form network usually, usually imbeds the degree of depth within 1 meter, underground, plays fault current of releasing, all presses and reduce the effect of impedance ground.As required grounded screen diverse location by guide body line be connected with the electrical equipment of ground surface.
The grounding grids of steel material is with the increase running the time limit; normal because of factors such as welding, corrosion; cause grounding grids to attenuate, rupture or occur breakpoint; different regions are because of the difference of geology, weather conditions, and corrosion rate also exists larger difference, and grounding grids sectional area excessively reduces or ruptures; the project organization of original grounded screen can be destroyed; cause impedance ground to raise, reduce ground connection performance, lose defencive function.Once cause power system accident by grounded screen, often can cause device damage, have a power failure suddenly, its directly and letter to connect economic loss huge.
The investigation breakpoint of grounding grids and etch state are the important preventive damage controls of one, electric system Yun Jian department.At present, after power department diagnoses the common method of ground net corrosion or fracture defect to cross certain time limit exactly, sampling excavates inspection, according to general configuration and the corrosion rate of grounded screen place soil, estimates the etch state of ground connection dictyosome by rule of thumb.This method has blindness, and workload is large, needs to consume a large amount of human and material resources and financial resources, is also subject to the restriction of on-the-spot service condition simultaneously, is difficult to the defect diagnosing earthing device accurately.
For large-scale latticed grounding body, researchist has also carried out a large amount of research work, has carried out the trial of some new methods, such as, and electrochemical method, Electromagnetic wave, node transimpedance method, surface potential method, transient electromagnetic method etc.Said method is that the detection of giant ground dictyosome provides some thinkings, also there is many limitation in practice, wherein, electrochemical method can analysis project few, can only obtain the information of local, ground penetrating radar is used for the problem that the detection of ground connection dictyosome exists lack of resolution, node transimpedance method needs ground connection dictyosome drawing accurately, need to follow the tracks of contrast, and be subject to the impact of the factor such as weather, edaphic condition, sense cycle is long, efficiency is low.In Practical Project, when grounding grids local corrosion or when there is little fracture, surface potential change less, for ground connection dictyosome etch state and find breakpoint be also difficult.Existing electromagnetic method needs back and forth to measure at grounding net of transformer substation ground surface, and efficiency is not high, is sometimes subject to the impact of topographical surface feature, and some region cannot be touched.Along with the fast development of China's electric utility, installed capacity increases year by year, quick and precisely detects breakpoint and the corrosion of grounded screen, is one of important preventive damage control ensureing that power system safety and stability runs.
Summary of the invention
There is the problems such as workload is large, accuracy is low, complicated operation mainly for the breakpoint of current detection grounded screen and the method for etch state in the present invention, provides a kind of grounding net of transformer substation water mean pressure conductor etch state remote control detection method.
The present invention is the technical scheme taked that solves the problem:
A kind of grounding net of transformer substation water mean pressure conductor etch state remote control detection method, comprises the following steps:
(1) low-voltage, high-current AC constant-current source is utilized, the sine-wave current signal that earth mat injects about 400Hz, a 5-50A is all crimped by two upper buried latticed levels of guide body alignment of grounded screen, the each branch road of latticed water mean pressure conductor is as emitting antenna, and spatial emission is with sine wave signal frequently towards periphery;
(2) by the field signal detection harvester that remotely pilotless helicopter carries, cruise fast at grounded screen ground surface and carry out data acquisition, complete the detection and the collection that grounded screen branch conductor are excited to magnetic field in ground surface spatial neighborhood;
(3) Big Dipper BDS carried by unmanned plane, GPS dual-mode system and data radio transmission system, by spatial data information and synchronous acquisition to magnetic field data information be together transferred to the terminal computer system on backstage;
(4) by the detection to magnetic field, whole grounded screen earth's surface, obtain magnetic field, earth's surface overall distribution figure, simulation calculation grounded screen emulation table magnetic field overall distribution figure under normal circumstances again, then magnetic field, earth's surface overall distribution figure and emulation table magnetic field overall distribution figure is contrasted, according to both difference, ground net corrosion is diagnosed out to attenuate or the particular location of the defect that ruptures;
(5) by wireless terminal, computer and software systems by the real-time reception of data, store, gather and analyze, output diagnostic result.
Magnetic field, earth's surface overall distribution figure in the present invention is identical with the method in the patent of notification number CN101216523B with simulated landscape magnetic field overall distribution drawing method.
The device that the present invention takes for achieving the above object is:
A kind of grounding net of transformer substation water mean pressure conductor etch state remote control pick-up unit, comprise buried grounded screen water mean pressure conductor, wherein: also comprise remotely pilotless machine, signal transmitting system, receiving system and background terminal system composition, described signal transmitting system is a low-voltage, high-current AC constant-current source, receiving system is made up of the detection of magnetic field unit be arranged on remotely pilotless machine and position coordinates and data wireless transmission unit, background terminal system is by radio receiving unit, host computer and the software composition be arranged on host computer, signal transmitting system injects sine-wave current signal by two buried latticed grounded screen water mean pressure conductors of upper guide body alignment of grounded screen, the each branch road of latticed grounded screen water mean pressure conductor is as emitting antenna, spatial emission is with sine wave signal frequently towards periphery, the sine wave signal of detection of magnetic field unit collection exports position coordinates and data wireless transmission unit to, sine wave signal to be sent to the software on host computer by position coordinates and data wireless transmission unit again by radio receiving unit, after being gathered by software again and analyzing, export grounded screen state and grounded screen security performance assessing result.
Host computer is by the detection to magnetic field, whole grounded screen earth's surface, obtain magnetic field, earth's surface overall distribution figure, simulation calculation grounded screen simulated landscape magnetic field overall distribution figure under normal circumstances again, then magnetic field, earth's surface overall distribution figure and emulation table magnetic field overall distribution figure is contrasted, according to both difference, ground net corrosion is diagnosed out to attenuate or the particular location of the defect that ruptures.
Magnetic field, earth's surface overall distribution figure in the present invention is identical with the method in the patent of notification number CN101216523B with simulated landscape magnetic field overall distribution drawing method.
Low-voltage, high-current AC constant-current source of the present invention is a frequency of operation 400Hz, the mid-frequency sinusoidal ripple AC constant-current source of output open circuit voltage 1-50V, output current 1-100A.
Detection of magnetic field unit of the present invention is by cell winding L, two-way operational amplifier A and filtering chip B tri-part composition, the center tap terminal ground connection of cell winding L, the output terminal of cell winding L is connected with No. 2 pins of two-way operational amplifier A first amplifier and No. 3 pins respectively, the first amplifier No. 1 output pin of two-way operational amplifier A is connected with No. 5 pin of filtering chip B, No. 2 pin of filtering chip B export No. 6 pins connecing the second amplifier input end of two-way operational amplifier A, No. 7 pins of two-way operational amplifier A second amplifier are the output terminal of measuring-signal after conditioning.
Position coordinates of the present invention and data wireless transmission unit are by Big Dipper BDS and GPS positioning navigation module C, microprocessor D and wireless transmitter receiver reciprocity chip E forms, the CLK of Big Dipper BDS and GPS positioning navigation module C, PPS with TCD data output end is connected with the corresponding data input end of microprocessor D respectively, the AINT3 input port of microprocessor D is connected with No. 7 pins of two-way operational amplifier A, the data-out port P0.4 of microprocessor D, P0.5, P0.6, P0.7, P0.13 and P0.14 is connected to the data-in port SCK0 of wireless transmitter receiver reciprocity chip E respectively, MISO0, MISI0, CSN, DR, CD-nF, the data control bus AM of microprocessor D, PWR-UP, uCLK, TX-EN, TRX-CE is connected to the data control bus input end of wireless transmitter receiver reciprocity chip E respectively.
Radio receiving unit of the present invention is by wireless receiving chip P, microprocessor G and host computer R forms, the data-in port SCK0 of wireless receiving chip P, MISO0, MISI0, CSN, DR, CD-nF is connected to the data-out port P0.4 of microprocessor G respectively, P0.5, P0.6, P0.7, P0.13 and P0.14, the data control bus input end of wireless receiving chip P is connected to the data control bus AM of microprocessor G respectively, PWR-UP, uCLK, TX-EN and TRX-CE, the Data Control of microprocessor G is connected with host computer by USB data line with transfer bus.
Cell winding L of the present invention is the fine self-adhesive enameled wire utilizing diameter to be 0.05mm, and adopt two-wire and rich mode, coiling 200 circle is made.
The present invention is directed to and utilize magnetic-field measurement to carry out grounded screen state-detection, magnetic-field measurement is wasted time and energy inefficient deficiency, by existing Helicopter Technology, big-dipper satellite location navigation and wireless data transmission technology combine, achieve the Quick Measurement of grounding net of transformer substation Distribution of Magnetic Field, carry out grounding net of transformer substation water mean pressure conductor breakpoint, the method of Corrosion monitoring side and system, for the feature of transformer station's subsurface grid shape water mean pressure conductor grounded screen, do not excavating, when not affecting substation operation, by upper guide body line emission medium-frequency sinusoidal current signal, measure it carries out grounded screen breakpoint and etch state defect diagonsis at the homogenous frequency signal that ground surface near space region excites.It is a whole set of diagnostic measurement system formed with emissive source, remote-control receiver measurement mechanism and computing machine three.Both can be used for the breakpoint of grounding net of transformer substation and etch state diagnosis, also can with the diagnosis and detection of earth conductor under the special topography condition such as petrochemical industry pump gas station, military radar net grounded screen.Its method is easy, diagnosis efficiency is high, engineering practicability is strong.
The present invention has following characteristics:
1, adopt the technology such as helicopter, Beidou satellite navigation and Wireless Data Transmission, realize the quick remote control scanning of grounding net of transformer substation ground surface Distribution of Magnetic Field and measure, carrying out the diagnosis of water mean pressure conductor breakpoint and etch state;
2, cut down Er Dinglv and Faraday's electromagnetic induction law based on than Ao-Sa, utilize cell winding to pick up field signal, utilize the electronic technology such as filtering and amplification, institute's pickoff signals is nursed one's health, extracts and differentiated;
3, by wireless transmission and the telecontrol engineering of data, the wireless transmission of the scan control to helicopter, volume coordinate and Magnetic Field is realized;
4, utilize computing machine and software systems to carry out the Quick Acquisition of data, storage, process and analysis, according to the characteristic sum rule of Distribution of Magnetic Field, obtain the assessment of the breakpoint of grounded screen water mean pressure conductor, etch state and security performance.
The emission coefficient that the present invention adopts, its feature is as follows: output frequency 400Hz, and output current can regulate in the scope of 5-50A, and the field condition according to tested grounded screen selects suitable strength of current.In order to realize electromagnetic compatibility, at the scene under complex electromagnetic environment, the measurement of field signal receives by amplifying and filtering adjustment, cooperation in conjunction with transmitter current intensity regulates, effectively can suppress on-the-spot electromagnetic interference (EMI), avoid mainly disturbing frequency, enable measuring accuracy and resolution meet the demand of detection.
To measure and data processing comprises computing machine and corresponding program, after completing the measurement of whole grounded screen field scan, by the process of Distribution of Magnetic Field data and analysis, export the analysis results such as the breakpoint of grounded screen and etch state the most at last.
Adopt the inventive method and detection system to carry out on-the-spot test in actual grounded screen, its diagnostic result and actual conditions are very consistent, and error, within 6%, can fast and effeciently be diagnosed grounded screen breakpoint, corrosion information, assess its security performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device adopted in the embodiment of the present invention;
Fig. 2 is detection of magnetic field cellular construction schematic diagram in the device adopted in the embodiment of the present invention;
Fig. 3 is position coordinates and data wireless transmission unit structural representation in the device adopted in the embodiment of the present invention;
Fig. 4 is radio receiving terminal control system schematic diagram in the device adopted in the embodiment of the present invention;
Fig. 5 is system software program structural drawing in the device adopted in the embodiment of the present invention;
Fig. 6 is certain grounding net of transformer substation Distribution of Magnetic Field measurement result of the embodiment of the present invention 1;
Fig. 7 is the grounded screen Distribution of Magnetic Field figure that the embodiment of the present invention 2 exists corrosion breakpoint.
Embodiment
Embodiment 1
A kind of grounding net of transformer substation water mean pressure conductor etch state remote control pick-up unit, as shown in Figure 1, comprise buried grounded screen water mean pressure conductor 1, remotely pilotless machine 2, signal transmitting system 3, receiving system 4 and background terminal system 5 form, described signal transmitting system 3 is a frequency of operation 400Hz, output open circuit voltage 1-50V, the mid-frequency sinusoidal ripple AC constant-current source of output current 1-100A, receiving system 4 is made up of the detection of magnetic field unit be arranged on remotely pilotless machine 2 and position coordinates and data wireless transmission unit, background terminal system 5 is by radio receiving unit, host computer and the software composition be arranged on host computer, signal transmitting system injects sine-wave current signal by two buried latticed grounded screen water mean pressure conductors of upper guide body alignment of grounded screen, the each branch road of latticed grounded screen water mean pressure conductor is as emitting antenna, spatial emission is with sine wave signal frequently towards periphery, the sine wave signal of detection of magnetic field unit collection exports position coordinates and data wireless transmission unit to, sine wave signal to be sent to the software on host computer by position coordinates and data wireless transmission unit again by radio receiving unit, after being gathered by software again and analyzing, export grounded screen state and grounded screen security performance assessing result.
As shown in Figure 2, detection of magnetic field unit is by cell winding L, AD8607 two-way operational amplifier A and MAX267 filtering chip B tri-part composition, the center tap terminal ground connection of cell winding L, the output terminal of cell winding L is connected with No. 2 pins of AD8607 two-way operational amplifier A first amplifier and No. 3 pins respectively, the first amplifier No. 1 output pin of AD8607 two-way operational amplifier A is connected with No. 5 pin of MAX267 filtering chip B, No. 2 pin of MAX267 filtering chip B export No. 6 pins connecing the second amplifier input end of AD8607 two-way operational amplifier A, No. 7 pins of AD8607 two-way operational amplifier A second amplifier are the output terminal of measuring-signal after conditioning.
As shown in Figure 3, position coordinates and data wireless transmission unit are by MT-5365 Big Dipper BDS and GPS positioning navigation module C, LPC2220FBD144 microprocessor D and nRf905 wireless transmitter receiver reciprocity chip E forms, the CLK of MT-5365 Big Dipper BDS and GPS positioning navigation module C, PPS with TCD data output end is connected with the corresponding data input end of LPC2220FBD144 microprocessor D respectively, the AINT3 input port of LPC2220FBD144 microprocessor D is connected with No. 7 pins of AD8607 two-way operational amplifier A, the data-out port P0.4 of LPC2220FBD144 microprocessor D, P0.5, P0.6, P0.7, P0.13 and P0.14 is connected to the data-in port SCK0 of nRf905 wireless transmitter receiver reciprocity chip E respectively, MISO0, MISI0, CSN, DR, CD-nF, the data control bus AM of LPC2220FBD144 microprocessor D, PWR-UP, uCLK, TX-EN, TRX-CE is connected to the data control bus input end of nRf905 wireless transmitter receiver reciprocity chip E respectively.
As shown in Figure 4, radio receiving unit is by nRf905 wireless receiving chip P, LPC2220FBD144 microprocessor G and host computer R forms, the data-in port SCK0 of nRf905 wireless receiving chip P, MISO0, MISI0, CSN, DR, CD-nF is connected to the data-out port P0.4 of LPC2220FBD144 microprocessor G respectively, P0.5, P0.6, P0.7, P0.13 and P0.14, the data control bus input end of nRf905 wireless receiving chip P is connected to the data control bus AM of LPC2220FBD144 microprocessor G respectively, PWR-UP, uCLK, TX-EN and TRX-CE, the Data Control of LPC2220FBD144 microprocessor G is connected with host computer R by USB data line with transfer bus.
As shown in Figure 5, first initialization and clock synchronous is carried out, then in the scope of 100mS-500mS, magnetic-field measurement acquisition time interval is set according to helicopter cruise speed, by these data and locus coordinate information synchronized transmission to backstage, background terminal accepts and stores synchronized positional information and field signal information, after whole scanning survey completes, carry out data analysis and draw grounded screen ground surface global magnetic field distribution situation figure, analysis grounding net breakpoint and etch state on this basis, last Output rusults.
Utilize the said equipment to the Distribution of Magnetic Field situation of certain on-the-spot test 220kV grounding net of transformer substation, its result with through strict theoretical analysis and calculation and simulation modelling simulation result height consistent, distribution plan is shown in Fig. 6, from distribution situation, the remote-control romote-sensing result adopting the present invention to carry out Distribution of Magnetic Field is reliable.
Embodiment 2
Device is identical with embodiment 1, to certain 500kV grounding net of transformer substation ground surface magnetic field local distribution situation, sees Fig. 7, from result, there is major defect at the water mean pressure conductor at x=50m, y=50-60m place, by excavating maintenance examination, show that this section of conductor is band steel, because corrosion is ruptured completely.
Claims (1)
1. a grounding net of transformer substation water mean pressure conductor etch state remote control detection method, is characterized in that comprising the following steps:
(1) low-voltage, high-current AC constant-current source is utilized, the sine-wave current signal that earth mat injects about 400Hz, a 5-50A is all crimped by two upper buried latticed levels of guide body alignment of grounded screen, the each branch road of latticed water mean pressure conductor is as emitting antenna, and spatial emission is with sine wave signal frequently towards periphery;
(2) by the field signal detection harvester that remotely pilotless helicopter carries, cruise fast at grounded screen ground surface and carry out data acquisition, complete the detection and the collection that grounded screen branch conductor are excited to magnetic field in ground surface spatial neighborhood;
(3) Big Dipper BDS carried by unmanned plane, GPS dual-mode system and data radio transmission system, by spatial data information and synchronous acquisition to magnetic field data information be together transferred to the terminal computer system on backstage;
(4) by the detection to magnetic field, whole grounded screen earth's surface, obtain magnetic field, earth's surface overall distribution figure, simulation calculation grounded screen emulation table magnetic field overall distribution figure under normal circumstances again, then magnetic field, earth's surface overall distribution figure and emulation table magnetic field overall distribution figure is contrasted, according to both difference, ground net corrosion is diagnosed out to attenuate or the particular location of the defect that ruptures;
(5) by wireless terminal, computer and software systems by the real-time reception of data, store, gather and analyze, output diagnostic result.
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| CN108872798A (en) * | 2018-08-22 | 2018-11-23 | 国网河南省电力公司电力科学研究院 | A kind of grounded screen topological structure adaptive cruise measuring device and measuring method |
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