CN102928704B - Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid - Google Patents
Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid Download PDFInfo
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- CN102928704B CN102928704B CN201210417790.4A CN201210417790A CN102928704B CN 102928704 B CN102928704 B CN 102928704B CN 201210417790 A CN201210417790 A CN 201210417790A CN 102928704 B CN102928704 B CN 102928704B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 44
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- 238000004891 communication Methods 0.000 claims description 13
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000005259 measurement Methods 0.000 description 10
- 239000004020 conductor Substances 0.000 description 5
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- 239000000463 material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
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- 238000013461 design Methods 0.000 description 3
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- 229910000975 Carbon steel Inorganic materials 0.000 description 2
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- 201000004569 Blindness Diseases 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides an intelligent diagnosis method for the corrosion failure point of a transformer substation grounding grid. The method comprises the following steps of: firstly, inputting a transformer substation grounding grid model into a computer, on the premise that the structure of the transformer substation grounding grid is analyzed, decomposing the transformer substation grounding grid and selecting an optimum point by a topology decomposition method, acquiring an electric potential signal and transmitting to an alternating current/direct current signal acquiring system by a preset sensor due to an injected sine alternating current single, transmitting the signal to the computer to be computed and displayed on a liquid crystal display by a microcontroller, computing the probable position in which the corrosion failure point is arranged by the computer according to the electric potential distribution, building a mini type grounding subgrid model, injecting a direct current large current signal into the mini type grounding subgrid, acquiring by a controller to acquire the node voltage and the current valve of the grounding grid at the time, and transmitting the acquired data to the computer to build mathematical model computation to finally obtain the specific position of the corrosion failure point.
Description
Technical field
This method relates to distribution transforming power station signal processing and analysis and transmission technology, and in more specific words it, the present invention relates to a kind of grounding net of transformer substation corrosion trouble spot intelligent diagnosing method.
Technical background
Along with large electrical network of modern times is to UHV (ultra-high voltage), large capacity and remote future development, more and more higher for power system security, requirement stable and economical operation, in order to ensure the safe and stable operation of electrical network, improve the reliability of power supply, must there is a good substation grounding device.
Trace it to its cause, grounded screen is that electric system is buried at underground hidden facility, and the on-the-spot technical problem underlying exposing is bad connection between the less than normal and grounding body in ground net corrosion, down conductor cross section, and these problems have buried hidden danger all to the fault of electric power.Ground net corrosion is the process of a gradual change, erodes to and to a certain degree enters malfunction, and reliability reduces even performance failure, can not meet the requirement of safe operation of power system.China is due to resource, economic dispatch reason, grounded screen material used is mainly plain carbon steel, ground net corrosion presents local corrosion form conventionally, occur that grounded screen carbon steel material after corrosion becomes fragile, aliquation, loose, attenuate, even rupture, so electric power grounding grid seriously corroded is current China electric power grounding grid distinct issues the most, and developed country is mainly using copper material as grounded screen abroad, its ground connection Performance Ratio iron and steel will be got well, and it is slow that extent of corrosion is wanted.
Many important electrical equipments in generating plant, transformer station, are concentrated, as transformer, generator, isolating switch, grounding switch, mutual inductor (voltage transformer (VT) summation current transformer), lightning arrester etc., A, the B of these equipment, C three-phase are to be all generally connected with band steel, then are connected with grounded screen by down conductor.Transformer station, generating plant, except laying grounded screen, also add concentrated grounding body under lightning rod and lightning arrester.Along with the rising of generating plant, transformer substation voltage grade, also more and more higher to laying the requirement of grounded screen band steel used.
Grounded screen is placed in underground, once grounded screen, because other reasons such as corrosion cause fault, will cause, grounding body cross section reduces, thermal stability inadequate, stake resistance increases.Although in the time carrying out ground grid design, adopt various safeguard procedures to reduce the extent of corrosion of grounded screen as far as possible, even but best design and safeguard procedures can not be predicted all situations that may occur in service life, still there will be in actual use various grounded screen faults, jeopardize safe operation of power system.Once grounded screen seriously corroded is to making the stake resistance of grounded screen defective, even when local fracture, to grounded screen to overhaul transformation be quite hard and difficult, expense is also huge.Therefore must detect the situation of grounded screen frequently or termly, with the variation tendency of analysis grounding net, and the situation of grounded screen is assessed, pinpointed the problems early to take corresponding safeguard procedures, prevent trouble before it happens, the maintenance of earthing device is seemed to very urgent and important.
The state-detection of grounded screen is a very important course of work always, also be a very hard work simultaneously, existing method is to find after the accident that ground network ground resistance is defective or generation earth mat causes, the method of searching grounded screen conductor breakpoint and corrosion section by dig on a wide area is very big with blindness, workload, while carrying out actual detection, need to there is very large change to the environment of electric substation, uncertainly can accurately detect quality, affect the safe operation of electric system.Therefore the invention of grounding net of transformer substation Research on Intelligent Diagnosis system, be power system security economical production in the urgent need to problem.
Summary of the invention
The invention provides corrosion trouble spot intelligent diagnosing method, detect data in order to gather ground net corrosion, fast, accurately and easily ground net corrosion situation is detected.
The alleged problem of the present invention realizes with following technical proposals: the ground net corrosion trouble spot intelligent diagnosing method matching with signal source, sensor by signal acquiring system.Both can avoid the problem that only can not accurately locate by Potential Distributing, and can avoid again grounded screen excessive and cause PC to calculate, or the inaccurate problem of result of calculation, method is easy, diagnosis efficiency is high, engineering practicability is strong.
Technical solution of the present invention: grounding net of transformer substation corrosion trouble spot intelligent diagnosing method, is characterized in that: 1) analyze the structural model of grounding net of transformer substation by terminal handler, applied topology decomposition method is decomposed grounding net of transformer substation and chosen optimum point; 2) inject simple alternating current electric signal to described grounding net of transformer substation, gather electric potential signal and transfer to alternating current-direct current signal acquiring system by ac signal acquisition sensor; 3) by a microcontroller, described electric potential signal is transferred to terminal handler and calculate and be shown to a liquid crystal display; 4) terminal handler distributes and calculates the approximate region at corrosion place, trouble spot according to electric potential signal, and builds the structural model of a small-sized ground connection subnet with regard to this region, then injects D.C. high-current signal to this small-sized ground connection subnet; 5) gather node voltage and the current value of this small-sized ground connection subnet by described microprocessor controls, the data transmission collecting to terminal handler is calculated to set up mathematical model; 6) show that small-sized ground connection subnet corrodes the particular location of trouble spot.
Further, in a preferred embodiment of the invention, described ac signal acquisition sensor comprises detecting coil, and the signal output part of described detecting coil connects the input end of alternating current-direct current signal acquiring system.
Further, in a preferred embodiment of the invention, described alternating current-direct current signal acquiring system for realize alternating current-direct current data collection, measurement, demonstration and and the usb communication of terminal handler, it comprises data acquisition module, usb communication module, microcontroller, liquid crystal display and power supply module, wherein said data acquisition module input end connects the output terminal of detecting coil to receive signal, and output terminal is connected to microcontroller; Described usb communication module, power supply module and liquid crystal display are connected to microcontroller.Wherein, system core module is microcontroller, and it controls data acquisition, and collection result is presented in liquid crystal display, and the communicating by letter of alternating current-direct current signal acquiring system and terminal handler.Between described alternating current-direct current signal acquiring system and terminal handler, be connected with USB2.0 agreement by usb communication module.
Further, in a preferred embodiment of the invention, described data acquisition module comprises analog to digital converter and the high precision reference potential device being attached thereto, and is coupled in the preposition anti-jamming circuit of described analog to digital converter.
Further, in a preferred embodiment of the invention, described preposition anti-jamming circuit is to be arranged between detecting coil and analog to digital converter, for the on-the-spot electromagnetic interference (EMI) of filtering grounded screen.
In a preferred embodiment of the invention, be first to analyze under the prerequisite of substation grounding web frame, applied topology decomposition method is decomposed grounding net of transformer substation and is chosen optimum point; Between reaching the standard grade in drawing of optimum point by sinusoidal ac signal input grounding net; The ac signal acquisition sensor that utilization presets changes the magnetic induction density signal exciting on earth's surface because of Injection Current into induced voltage signal, now can measure the distribution of the magnetic induction density on earth's surface, for calculating after a while; Obtain data and send to after terminal handler (being preferably PC or PDA equipment) by alternating current-direct current signal acquiring system, calculating grounding net of transformer substation earth's surface magnetic induction density under normal circumstances distributes, then measurement result and simulation result are compared, according to both difference, the Position Approximate of diagnosing out ground net corrosion trouble spot to occur; Selecting after the Position Approximate of ground net corrosion trouble spot appearance, PC generates a small-sized grounded screen regional model automatically near this position, being external in D.C. high-current source drawing of choosing at random in this small-sized grounded screen region reaches the standard grade, voltage between measurement ground lead and the electric current in loop, obtain the input pickup resistance between two ground leads; Measurement result is inputted to PC and is obtained the resistance value of each section of conductor; Resistance value during by this resistance value and normal condition compares, and just can obtain that grounded screen band iron corrosion attenuates or particular location and the degree of the defect that ruptures.Whether the present invention can, in the situation that not having a power failure and earth mat not being excavated, can understand the extent of corrosion of each section of conductor of earth mat and rupture, and ensures safety, the reliability service of electric system.And have and simply, accurately, be not subject to the advantages such as the restriction of on-the-spot service condition.
Further, in a preferred embodiment of the invention, add anti-jamming circuit at collection signal end, effectively suppress on-the-spot electromagnetic interference (EMI), to the signal of measuring gained after notch filter, filtering, phase sensitive detection are processed, by power frequency and other interference rejection.
Brief description of the drawings
Fig. 1 is grounding net of transformer substation corrosion diagnosis process flow diagram of the present invention;
Fig. 2 is the hardware design structure figure of grounding net of transformer substation corrosion diagnosis of the present invention diagnostic system used.
Embodiment
See figures.1.and.2, the preferred embodiment of grounding net of transformer substation of the present invention corrosion trouble spot intelligent diagnosing method comprises step: 1) analyze the structural model of grounding net of transformer substation 1 by the terminal handler 5 of diagnostic system, applied topology decomposition method is decomposed grounding net of transformer substation 1 and chosen optimum point; 2) inject simple alternating current electric signal to grounding net of transformer substation 1, gather electric potential signal and transfer to alternating current-direct current signal acquiring system 3 by ac signal acquisition sensor 2; 3) by a microcontroller 33, described electric potential signal is transferred to terminal handler 5 and calculate and be shown to a liquid crystal display 34; 4) terminal handler 5 distributes and calculates the approximate region at corrosion place, trouble spot according to electric potential signal, and builds the structural model of a small-sized ground connection subnet 11 with regard to this region, then injects D.C. high-current signal to this small-sized ground connection subnet 11; 5) control by described microcontroller 33 node voltage and the current value that gather this small-sized ground connection subnet 11, the data transmission collecting to terminal handler 5 is calculated to set up mathematical model; 6) show that small-sized ground connection subnet 11 corrodes the particular location of trouble spot.
Further, in a preferred embodiment of the invention, described ac signal acquisition sensor 2 comprises detecting coil, and the signal output part of described detecting coil connects the input end of alternating current-direct current signal acquiring system 3.
Further, in a preferred embodiment of the invention, described alternating current-direct current signal acquiring system 3 for realize alternating current-direct current data collection, measurement, demonstration and and the usb communication of terminal handler, it comprises data acquisition module 31, usb communication module 32, microcontroller 33, liquid crystal display 34 and power supply module 35, wherein said data acquisition module 31 input ends connect the output terminal of detecting coil to receive signal, and output terminal is connected to microcontroller 33; Described usb communication module 32, power supply module 35 and liquid crystal display 34 are connected to microcontroller 33; .System core module is microcontroller 33, and it controls data acquisition, and collection result is presented in liquid crystal display 34, and the communicating by letter of alternating current-direct current signal acquiring system and terminal handler.Between described alternating current-direct current signal acquiring system 3 and terminal handler 5, be connected with USB2.0 agreement by usb communication module 32.
Further, in a preferred embodiment of the invention, described data acquisition module 31 comprises analog to digital converter 311 and the high precision reference potential device 312 being attached thereto, and is coupled in the preposition anti-jamming circuit of described analog to digital converter 311.
Further, in a preferred embodiment of the invention, described preposition anti-jamming circuit is to be arranged between detecting coil and analog to digital converter 311.In a preferred embodiment of the invention, preposition anti-jamming circuit comprises integrator and the wave filter that AD7718 is built-in, and the filtering circuit of front end, can effectively suppress the interference to earth mat under strong-electromagnetic field environment, especially can well suppress the interference of power frequency component, the data that make to collect reach precisely, stablize, requirement reliably.
In a preferred embodiment of the invention, first the structural model of grounding net of transformer substation 1 is inputed to terminal handler 5(and be preferably PC), analyzing under the prerequisite of grounding net of transformer substation 1 structure, applied topology decomposition method is decomposed grounding net of transformer substation 1 and is chosen optimum point, by drawing to grounded screen 1 the injection sinusoidal ac signal of reaching the standard grade, by the ac signal acquisition sensor 2 presetting, the collection of grounded screen electric potential signal is transferred to alternating current-direct current signal acquiring system 3, its microcontroller 33 transfers to PC 5 by this signal and calculates and be shown to liquid crystal display 34, PC 5 calculates corrosion place, trouble spot Position Approximate according to grounded screen Potential Distributing, and build small-sized ground connection subnet 11 models in this band of position, inject D.C. high-current signal to this small-sized ground connection subnet 11 again, and control and gather now grounded screen node voltage and current value by microcontroller 33, the data transmission collecting to PC is set up to calculated with mathematical model, finally obtain corroding the particular location of trouble spot.
The material that the present invention needs is the band iron laying state of grounding net of transformer substation 1, be that grounded screen band iron lays figure, this figure is inputed to PC 5, or on PC 5, corrode fault diagnosis system by grounding net of transformer substation and generate in proportion fast a standard grounded screen figure.
First, applied topology decomposition method is decomposed grounding net of transformer substation 1 and is chosen optimum point.There is N node, N for one
tthe grounded screen 1 of individual accessible node, can use the circuit network theory unreachable node of pruning, and grounded screen is carried out to layer reduction.If grounded screen is carried out to node tearing based on one group of accessible node, tear out a relatively independent sub-network, and the connected node of this sub-network and grounded screen remainder is all this group accessible node, claim that this sub-network is a column.Retaining under the prerequisite of whole accessible nodes, can and grounded screen 1 in parallel branch merge to greatest extent, yojan, to the network that has at the most a branch road between any two accessible nodes, is called intrinsic grounded screen, the branch road wherein comprising is called intrinsic branch road, its quantity B
trepresent.After decomposition, choose at random two remaining nodes, as sinusoidal signal decanting point.
The present invention adopts sine-wave excitation source, and two of the grounding net of transformer substation calculating by PC 5 are drawn and reach the standard grade, and directly inject exciting current.Under transformer station's complex electromagnetic environment, the measurement of earth's surface magnetic induction density adopts the logical adjustable bandpass filter of centre frequency of band.By with the adjusting that coordinates of exciting signal frequency, avoid power frequency noise spot, make measuring accuracy and resolution can meet defect diagonsis requirement.First PC 5 calculates grounded screen earth's surface magnetic induction density under normal circumstances and distributes, then measurement result and simulation result are compared, and according to both difference, the Position Approximate of diagnosing out ground net corrosion trouble spot to occur.Meanwhile, PC 5 is automatically selected a small-sized ground connection subnet 11 around this band of position, as next step Test Network, and then obtains the particular location of trouble spot.
Finally measure small-sized ground connection subnet obtained in the previous step, as required, DC source is between each measurement point and point of excitation, input appropriate pumping signal to grounded screen 11, then data collection station 5 is measured selected measurement point, by signal filtering and transfer data to corrosion diagnosis system.Corrosion diagnosis detection system runs on PC 5, according to the physical arrangement of ground connection subnet, generates corresponding circuit accounting equation, then according to the grounded screen data that collect, by computation model, the resistance of each section of grounded screen is calculated.For a grounded screen with m node, n bar branch road, the incidence matrix of grounded screen is A, and it can obtain from the topological structure of grounded screen.Suppose A={k
0, k
1...., k
jaccessible node collection, specify k
0for reference mode, at k
0with k
jbetween extrinsic motivated
ignore inductance and the electric capacity of each branch road, according to Circuit theory, its node voltage KVL equation is
Nodal-admittance matrix wherein
G＝A·diag(x
1,x
2,L,x
n)A
T (2)
Wherein x
1, x
2..., x
nfor each branch node coordinate, naturally require to be
Wherein ε
ufor electric potential difference between node,
for k under the excitation of j kind, after ground net corrosion
sthe measuring value of individual node voltage,
for k under the excitation of j kind, after ground net corrosion
sthe calculating analogue value of individual node voltage.In the time that electric current flows into the earth by the ground lead of grounded screen, its electric current distributes by constant current field principle, and meets minimum energy principle, each branch voltage
with node voltage U
(j)relational expression be:
Wherein B represents the transposition of incidence matrix A.Now, entirely network energy is
Consider that, after ground net corrosion, resistance value necessarily increases, therefore the mathematical model of problem is
Wherein R
k0for the initial resistance of node, PC, by solving this mathematical model, obtains the resistance value of each section of band iron of grounded screen, and the original resistance value known with us compare, and just can obtain concrete corrosion position of failure point.
Data-transmission mode of the present invention is: the multiple signals that utilize alternating current-direct current signal acquiring system 3 synchronous acquisition grounded screen test nodes, after high-precision adc, 24bit digital signal is transferred to microcontroller 33(by SPI interface and is preferably CY7C68013 type MCU chip), be then preferably USB2.0 interface by the usb communication module 32(of microcontroller 33) data are sent on PC 5 and processed, judge and analyze.Meanwhile, by the I of CY7C68013 microcontroller 33
2c meets SLC and SDA sends into liquid crystal display 34.
In the present invention, the opening of system shows the open nature of data acquisition system (DAS), data base management system (DBMS) and applied analysis system, the exchange between data and the power acquisition communication standard usb protocol of industry.
In sum, the grounding net of transformer substation corrosion diagnosis method that the present invention introduces is that software and hardware is nested, and has the measurement diagnostic method of very large extendability.The alternately input of the signal source of alternating current-direct current both can have been avoided the problem that only can not accurately locate by Potential Distributing, can avoid again grounded screen excessive and cause PC to calculate, or the inaccurate problem of result of calculation, method is easy, diagnosis efficiency is high, engineering practicability is strong.
These are only the preferred embodiment of the present invention, be intended to embody outstanding technique effect of the present invention and advantage, is not the restriction to technical scheme of the present invention.Those skilled in the art will appreciate that all amendments of having done based on the technology of the present invention content, variation or substitute technology feature, all should be covered by the technology category of claims opinion of the present invention.
Claims (5)
1. grounding net of transformer substation corrosion trouble spot intelligent diagnosing method, is characterized in that:
1) analyze the structural model of grounding net of transformer substation by terminal handler, applied topology decomposition method is decomposed grounding net of transformer substation and is chosen optimum point;
2) inject simple alternating current electric signal to described grounding net of transformer substation, gather electric potential signal and transfer to alternating current-direct current signal acquiring system by ac signal acquisition sensor;
3) by a microcontroller, described electric potential signal is transferred to terminal handler and calculate and be shown to a liquid crystal display;
4) terminal handler distributes and calculates the approximate region at corrosion place, trouble spot according to electric potential signal, and builds the structural model of a small-sized ground connection subnet with regard to this region, then injects D.C. high-current signal to this small-sized ground connection subnet;
5) gather node voltage and the current value of this small-sized ground connection subnet by described microprocessor controls, the data transmission collecting to terminal handler is calculated to set up mathematical model;
6) show that small-sized ground connection subnet corrodes the particular location of trouble spot.
2. grounding net of transformer substation corrosion according to claim 1 trouble spot intelligent diagnosing method, is characterized in that: described ac signal acquisition sensor comprises detecting coil, and the signal output part of described detecting coil connects the input end of alternating current-direct current signal acquiring system.
3. grounding net of transformer substation corrosion according to claim 1 and 2 trouble spot intelligent diagnosing method, it is characterized in that: described alternating current-direct current signal acquiring system comprises data acquisition module, usb communication module, microcontroller, liquid crystal display and power supply module, wherein said data acquisition module input end connects the output terminal of detecting coil to receive signal, and output terminal is connected to microcontroller; Described usb communication module, power supply module and liquid crystal display are connected to microcontroller; Between described alternating current-direct current signal acquiring system and terminal handler, connected by usb communication module.
4. grounding net of transformer substation corrosion according to claim 3 trouble spot intelligent diagnosing method, it is characterized in that: described data acquisition module comprises analog to digital converter and the high precision reference potential device being attached thereto, and be coupled in the preposition anti-jamming circuit of described analog to digital converter.
5. according to the grounding net of transformer substation corrosion trouble spot intelligent diagnosing method described in claim 4, it is characterized in that: described preposition anti-jamming circuit is to be arranged between detecting coil and analog to digital converter, for the on-the-spot electromagnetic interference (EMI) of filtering grounded screen.
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| CN201210417790.4A CN102928704B (en) | 2012-10-26 | 2012-10-26 | Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid |
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| CN201210417790.4A CN102928704B (en) | 2012-10-26 | 2012-10-26 | Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid |
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