CN102110978A - Method and device for high-accuracy low-current intelligent grounding wire selection - Google Patents
Method and device for high-accuracy low-current intelligent grounding wire selection Download PDFInfo
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Abstract
The invention discloses a method and a device for high-accuracy low-current intelligent grounding wire selection, and relates to the technical field of distribution network low-current grounding wire selection, wherein a set of novel method and device equipment for the high-accuracy grounding wire selection are designed. In the method, 'a microcontroller, a special electric energy measuring chip and an electric quantity acquisition processing circuit special for the grounding wire selection' are used as a hardware structure base, and the electric energy measuring chip is adopted to design the electric quantity acquisition processing circuit special for the grounding wire selection. A set of software decision method, which can be used for correcting special multi-parameter grounding wire selection electronic file records and an adaptive grounding wire selection algorithm combination, is designed. A grounding wire selection adaptive combinational algorithm mechanism cooperatively processed by a variety of grounding wire selection methods is adopted and is constantly and automatically modified and newly-built in a variety of field use processes so as to dynamically establish each grounding wire selection electronic file record and the adaptive grounding wire selection algorithm combination according with a variety of field reality, and realize effective wire selection under a variety of complex grounding conditions.
Description
Technical field:
The present invention relates to power distribution network small current earthing wire-selecting technical field, also relate to the marginal technology field that electric energy computation chip technology and earthing wire-selecting technology are blended mutually.
Background technology:
The route selection problem of small current neutral grounding system is an ancient and jejune technical barrier of domestic and international electric power system always.Accurately detect faulty line behind the single-phase earthing and also fix a breakdown rapidly, to huge day by day safe operation of power system, raising power supply reliability and the energy-conservation important effect that plays.
China 3KV-66KV power distribution network and part 400V-3KV power distribution network generally adopt both system with non effectively earth ed neutral (NUGS) of small current neutral grounding mode, comprise isolated neutral system (NUS), neutral point resistance grounded system (NRS) and neutral by arc extinction coil grounding system (NES is called resonant earthed system again).The advantage of small current neutral grounding system is that single-phase-to-ground current is less, does not form short-circuit loop during single-phase earthing, in most cases blow-out and recovery insulation automatically.Can continue to move 1～2 hour after China's electric power system rules regulation small current system generation earth fault.When but permanent earth fault took place, non-fault phase voltage raise, and ground connection operation for a long time very easily forms alternate ground short circuit, and arc grounding also can cause the total system overvoltage, the harm line insulation.
Abroad research emphasis and the processing mode to the small current neutral grounding protection has nothing in common with each other.U.S.'s neutral point of electric network mainly adopts resistance earthing, utilize zero sequence excess current protection moment excision faulty line, but fault trip only is used for neutral point through the low-impedance earthed system system, to the high resistance ground system, warning function is only arranged during ground connection.France's past is in the majority with resistance earthing; utilize the zero sequence excess current principle to be grounded error protection; continuous input along with the city cable circuit; capacitance current increases rapidly; begun to adopt the arc suppression coil of automatic tuning with the building-out capacitor electric current; and, proposed to utilize Prony method and wavelet transformation with the protection scheme of the information (as frequency, amplitude, phase place) in the extraction fault transient signal with differentiation fault and non-fault line for solving the earthing wire-selecting problem of this kind system.Norway one company adopts the method for measuring residual voltage and zero-sequence current space electric field and magnetic field phase place, has developed a kind of suspension type earth-fault indicator, and segmentation is suspended on circuit and the bifurcation.The microcomputer type earth-fault relay of Canada one company development has also adopted the protection philosophy of zero sequence excess current, and its software algorithm has partly adopted walsh function, to improve the speed of calculating ground fault current effective value.External also have the document that artificial neural net and expert system method are applied to protect.
China since the fifties just the research of and device theoretical to the ground connection fault line detection, and the several generations product that released one after another.At present domestic line selection apparatus is mainly based on zero-sequence current principle, zero sequence power direction principle, first half-wave principle, harmonic current orientation principle and " signal injection method " etc.On variant projects of location, except that the absolute definite value protection scheme of routine, also has colony than amplitude ratio phase scheme, maximum Isin φ or Δ (Isin φ) scheme etc.The eighties in last century; development provides hardware condition to small current earthing wire-selecting in the appearance of microcomputer; started the application climax of " small current earthing wire-selecting technology " beginning of the nineties; the producer that produces all types of line selection apparatus on the market is a lot; the earthing wire-selecting protective device had once obtained extensive use at the scene, for positive effect has been played in the safe operation that guarantees electrical network.But the later stage nineties has been absorbed in low tide again, has producer's line selection apparatus of 80%～90% to withdraw from production because of the route selection poor effect approximately.
More deep to the correlation theory research of NUGS single phase ground fault both at home and abroad, the route selection technology is abundanter on theoretical method, proposes a lot of route selection criterions based on the different faults characteristic quantity.But because all factors, still performance can't be satisfactory in actual applications for the small current earthing wire-selecting product of the whole industry in home and abroad, and accuracy rate is low, malfunction, tripping phenomenon often take place.Single-phase grounded malfunction in grounded system of low current route selection problem is still the difficult problem of puzzlement power distribution network operation, is restricting distribution network automated fast development.
At the problem that the small current earthing wire-selecting technology industry faces, technos generally believes both at home and abroad: the route selection technology is relatively abundanter ripe on theory research and principle; The greatest problem that small current earthing wire-selecting is used is that Detection of weak is handled and integrity problem, mainly is that device and measuring system related hardware are sensitive inadequately to the collection of electric parameters, has influenced the effect of small grounding current line selection apparatus; Various single principle algorithms or simple and mechanical combination have limitation, can not accurately judge faulty line under complicated ground connection situation.
The special-purpose computation chip technology of electric energy is that a kind of high accuracy electric weight of develop rapidly in recent years detects new technology, is particularly suitable for the detection acquisition process of faint electric quantity signal.In recent years, the more and more higher and global attention along with the intelligent electric power management expectancy to green energy resource, electric energy computation chip has been broken through traditional charging notion, and special-purpose computation chip certainty of measurement height of new electric energy and comprehensive function are powerful.The computation chip of the medium-to-high grade electric energy special use of the single-phase or three-phase of main electric energy computation chip producer both at home and abroad, all integrated multi-channel A C, reference voltage circuit and the digital signal processor (DSP) that is not less than 16, be used for sampled voltage, electric current, calculation process comprises the various electrical energy parameters of first-harmonic, harmonic wave and all-wave (first-harmonic+harmonic wave).Such chip can high-acruracy survey each reach mutually to close and comprise first-harmonic, harmonic wave and all-wave active power, reactive power, apparent power, meritorious energy and quadergy mutually, simultaneously can also measuring frequency, parameters such as each phase current and voltage effective value, power factor, phase angle, frequency, the apparent electric energy is provided, the high-end chip of part has the open function of ADC sampling primary data cache, the user does not need frequent generation to interrupt reading real-time adc data, has strengthened the precision of current effective value small-signal.Because all parameters all are the results of electric energy computation chip internal hardware computing, thereby the high accuracy and the reliability of parameter have fully been guaranteed, such chip also provides special-purpose (as: SPI) communication interface, all measurement parameter results can be directly exported in the transmission of data parameters between convenience and the external microcontroller.External microcontroller can be absorbed in work such as management, professional algorithm and communication processing.
New electric energy computation chip technology is progressively applied in other electric automatization industry beyond the electric energy metrical technical field, but does not also see related application document and product in the earthing wire-selecting technical field.Patent of the present invention adopts new invention technical method at a difficult problem and fast-developing electric energy computation chip new technology that domestic and international earthing wire-selecting technical field exists, design one cover comprehensive small current earthing wire-selecting method of high-precision intelligent and device.
Summary of the invention:
The object of the present invention is to provide a cover high-precision intelligent type small current earthing wire-selecting method and an appliance arrangement.Realize solving Detection of weak from the hardware configuration method innovation on the one hand and handle and integrity problem, realize high accuracy, high accuracy intelligence earth fault line selection by the software engineering innovative approach on the other hand.
Chat purpose on realizing, technical method of the present invention comprises following a few part, and the scope of the invention also comprises the similar implementation method that claims comprise.
One of the technology of the present invention method is novel key circuit structure design: the special-purpose electric quantity acquisition treatment circuit of earthing wire-selecting.As accompanying drawing 1, special-purpose electric energy computation chip front end input only is connected with residual voltage, zero-sequence current acquisition process circuit, is specifically designed to the acquisition process electrical parameter relevant with earthing wire-selecting, as various zero sequence electrical parameters.The small current earthing wire-selecting mode of operation (structure) that in the present invention circuit structure of this structure is called special-purpose electric energy computation chip.Also according to the auxiliary requirement of technology, also comprised the conventional usage of electric energy computation chip in the route selection field, ground as shown in accompanying drawing 5 among the present invention simultaneously.
Two of the technology of the present invention method is on technical method one basis, and design is also adopted " the special-purpose electric quantity acquisition treatment circuit of microcontroller+special-purpose electric energy computation chip+earthing wire-selecting " hardware configuration.The present invention adopts the special-purpose electric energy computation chip in middle and high end (as Zhuhai torch power ATT70xx series of specific embodiments employing), come the signals such as electric current, voltage, phase place of input are carried out sampling processing by the embedded multi-analog acquisition channel of chip, filter circuit, phase-shift circuit, ADC analog-to-digital conversion module, embedded DSP digital signal processing unit is finished the various computings of electrical energy parameter, multi-parameter operation result and original sampling data is stored in the relevant register and by embedded communication interface (as the SPI interface) and external microcontroller carries out exchanges data simultaneously.The high accuracy parameter that microcontroller of the present invention adopts is the result data that special-purpose computation chip internal hardware directly carries out computing, the electrical quantity that institute's energy measurement provides reaches nearly hundred kinds, comprises a large amount of voltage, electric current, power, electric energy, power factor, power direction, phase place, frequency parameter and data such as multiple first-harmonic, harmonic parameters.
The technology of the present invention method adopts novel hardware configuration to provide a kind of high accuracy hardware platform for the realization of small current earthing wire-selecting integration algorithm.The current data that this special circuit structure is gathered is the special earthing wire-selecting multi-parameter set relevant with earthing wire-selecting, mainly comprises multiple electrical parameters such as residual voltage, zero-sequence current, zero-sequence current and residual voltage angle, zero sequence active power, zero sequence reactive power, zero sequence active energy, zero sequence reactive energy, zero sequence active power direction, zero sequence reactive power direction, homopolar power factor, Zero-pharse harmonic electric current, Zero-pharse harmonic power, zero sequence fundamental energy, Zero-pharse harmonic electric energy.
In technical solution of the present invention, the required measurement parameter of microcontroller directly reads acquisition from special-purpose computation chip hardware result of calculation.The special-purpose measurement technology chip technology of electric energy is that a kind of high accuracy electric weight detects new technology, be particularly suitable for the detection acquisition process of faint electric quantity signal, its hardware calculation process technology than microcontroller more speciality calculate in precise information, and can obtain more abundant parameter kind.This technical scheme frees microcontroller from a large amount of loaded down with trivial details work such as the general data acquisition of traditional embedded design, calculating, specialize in the comprehensive route selection data algorithm of rear end and handle and the management Control work.
Three of the technology of the present invention method is to set up the special multi-parameter earthing wire-selecting electronic record record that can revise automatically.The program that the present invention comprises is in running, according to the concrete actual normal parameter that calculates of each monitoring target, the test for ground parameter, the unusual fault feedback parameter that reaches, handling automatic foundation the in back as calculated reaches constantly according to various unusual, the multi-parameter earthing wire-selecting electronic record record that event of failure is revised, this special electronic record record is by the residual voltage relevant with earthing wire-selecting, zero-sequence current, zero-sequence current and residual voltage angle, zero sequence active power, the zero sequence reactive power, the zero sequence active energy, the zero sequence reactive energy, the zero sequence active power direction, zero sequence reactive power direction, the homopolar power factor, the Zero-pharse harmonic electric current, Zero-pharse harmonic power, the zero sequence fundamental energy, multiple route selection electrical parameter such as Zero-pharse harmonic electric energy is formed, this special electronic record record also comprises the dissimilar features of grounding system, but multiple recognition feature parameters such as the difference characteristic of same kind are stored in the special nonvolatile memory such as FLASH or ferroelectric RAM by Automatic Program.
Four of the technology of the present invention method be one of technical method, two and three basis on, adopt earthing wire-selecting combinational algorithm based on the multiple selection method associated treatment of electric energy computation chip technology.The core work of microcontroller is to carry out the small current earthing wire-selecting algorithm process, that utilizes that electric energy computation chip provides enriches high accuracy parameter and earthing wire-selecting electronic record record, and select to adopt: harmonic analysis method, active power direction method, zero sequence reactive power method, residual flow method of addition, sudden change method of addition, energy method, zero-sequence current harmonic wave phase comparing method, intelligence are than several line selection algorithms such as width of cloth phase comparing methods.Also comprise earthing type systems such as being respectively NUS, NES and NRS and select the line selection algorithm combination that result of use is excellent, cooperative compensating is strong.According to the earth fault type and the measuring-signal of various complexity, from faint signal, accurately extract useful information, make every kind of method all at the concrete characteristics of signal separately, increase concertedness, complementarity between the distinct methods.
Five of the technology of the present invention method is self-adaptive controlled making mechanisms of earthing wire-selecting of setting up based on the special earthing wire-selecting electronic record record of each circuit that can revise automatically, can be newly-built.Adopt adaptive control thought, set up stage by stage and revise and improve the special electronic record record of earthing wire-selecting algorithm model.General three stages of division, but interest field of the present invention was not limited to for three stages.Phase I is the program establishment stage, according to Adaptive Control Theory, sets up the integration algorithm model of the special electronic record record of preliminary general earthing wire-selecting when the product internal processes is write; Second stage is experimental stage or on-the-spot initial stage operational phase at the scene, the integration algorithm model that foundation is write down at the on-the-spot actual special electronic record of concrete earthing wire-selecting, this stage has comprised by calculating the impedance of each concrete circuit, capacitive reactance, induction reactance, phase angle and each circuit are because of different length, different cabling environment are (as built on stilts, poling is gone into ground, wire spacing, insulating material) series of features parameter such as determined zero sequence data, automatically discern NUS, NRS, the difference characteristic of different classes of earthing wire-selecting system such as NES and same kind, and set up the special electronic record record of each concrete earthing wire-selecting; Phase III is in the daily use in later stage, according to Adaptive Control Theory, and the integration algorithm model of the special electronic record record of correction or newly-built earthing wire-selecting in unusual or event of failure trigger.Feed back by anomalous event, event of failure, output result in the use, and triggering signals such as auxiliary man-machine interface and communication input, by making a strategic decision relatively, judge each line work comprehensive state with each special electronic record record major parameter of former foundation.For example, differ greatly with oneself former special electronic record record, but can determine that this circuit is not a fault,, revise the major parameter value of electronic record record or rebuild electronic record and note down also storage then according to the degree of difference.In the actual field use, the present invention dynamically sets up special electronic record record and the combination of adaptive earthing line selection algorithm that meets concrete on-the-spot outlet actual, that tend towards stability or bus.
Adopt this earthing wire-selecting adaptive earthing route selection combinational algorithm mechanism, comprehensive various selection methods, with effective range technology and continuous route selection technology organically synergistic combination be sufficient comprehensive criterion combination.Constantly correction and newly-built automatically in various on-the-spot uses, dynamically set up and meet various on-the-spot actual each earthing wire-selecting electronic record record and the combinations of adaptive earthing line selection algorithm, improve the accuracy of comprehensive route selection, realize the effective route selection under the various complicated grounding requirements.
Further specify content of the present invention below in conjunction with accompanying drawing and concrete invention embodiment.
Description of drawings:
Fig. 1 is special-purpose electric energy computation chip earthing wire-selecting mode of operation (structure) figure of indication of the present invention
Fig. 2 is a technology hardware plan block diagram of the present invention
Fig. 3 is a general procedure flow chart of the present invention
Fig. 4 is the theory diagram of Adaptable System of the present invention
Fig. 5 is the specific embodiment of the present invention microcontroller circuit block diagram
Specific embodiments of the present invention are as follows:
With reference to Fig. 1, this is electric energy computation chip earthing wire-selecting mode of operation (structure) schematic diagram that the present invention uses the three-phase electrical energy computation chip design.Each electric energy computation chip route selection working cell input termination 3 tunnel of specific embodiments belongs to the residual voltage U0 of zero-sequence current I0n, I0n+1, I0n+2 and this section bus of one section bus together.This residual voltage U0 is demultiplexing after adjusting processing of circuit, receives the voltage input end (Ua, Ub, Uc) of this computation chip respectively, and I0n, I0n+1, I0n+2 receive the current input terminal (Ia, Ib, Ic) of this computation chip respectively.This patent embodiment adopts the adjustment circuit after the plurality of voltages follower circuit is gathered as residual voltage U0, and purpose is to ensure multichannel adjustment circuit output voltage identical with 1 road input voltage (phase place is identical, equal and opposite in direction).Utilize the input impedance height of voltage follower, and the low characteristics of output impedance improve the multichannel carrying load ability.Patent right of the present invention is not limited to the voltage follower adjustment circuit that this embodiment adopts, and also comprises the adjustment circuit of other equivalent effect.
Device in the specific embodiments of the present invention comprises one or more electric energy computation chip earthing wire-selecting pattern (structure) circuit board module, each circuit board module comprises one or more electric energy computation chip route selections working cell, patent specific embodiments of the present invention is designed to 1～6 route selection working cell, and just each circuit board module can be monitored 1～18 road outgoing.The outgoing of same circuit board module should belong to one section bus together.
Fig. 2 is a technical scheme hardware block diagram of the present invention.As shown in the figure, the present invention is a hardware core with microcontroller and special-purpose electric energy computation chip, and electric energy computation chip is connected by the SPI interface with microcontroller; Electric quantity acquisition is adjusted circuit and is connected with voltage, the current input terminal of special-purpose electric energy computation chip, also selectable simultaneously design has the inner ADC acquisition channel of auxiliary electric weight acquisition process circuit and microcontroller directly to be connected, and can gather electrical parameters such as electric current, voltage and residual voltage, zero-sequence current, frequency, phase place.Comprise warning output circuit, protective circuit and other communicating circuit etc. in the technology of the present invention hardware plan.
Fig. 3 is a general procedure flow chart of the present invention.Program circuit of the present invention is from [initialization] 1 to [read computation chip and auxiliary electric weight acquisition process] 2, [computing of each comprehensive parameters of electric weight] 3, [according to earthing wire-selecting integration algorithm principle, carry out data processing] 4, [whether having unusual or earth fault] 5, if there is earth fault to take place, according to the Synthesis principle criterion of on various route selection know-whies basis, integrating, carry out [earth fault processing] 6, and execution [event of failure triggering, revise the electronic record record] 8, revise or set up special electronic record selectively, result is carried out [data record storage] 9, then [end is returned] 10; If unusual or other the non-failure exception generation before the earth fault is arranged, carrying out [anomalous event triggers, and revises the electronic record record] 7, result's [data record storage] 9, [end is returned] 10 then as incident unusually; If judge no abnormal or fault, then turn back to [reading computation chip and auxiliary electric weight acquisition process] 2, enter new round circulation.
Core algorithm of the present invention is to set up special earthing wire-selecting electronic record record that comprises each circuit and the integration algorithm model that the adaptive earthing line selection algorithm makes up.Utilize built-in each special electronic record record of software and the incompatible computing decision-making of earthing wire-selecting algorithm groups, identification judgment task comprehensive state, if differ greatly with special electronic record record, may handle as earth fault, but determine that through feeding back this is not a fault, then, automatically perform and revise special electronic record, the result data record is stored according to the degree of difference.A kind of adaptive control " study " process that apparatus of the present invention that Here it is realize by program, use by normal actual field, apparatus of the present invention can be set up special electronic record record of the stable dynamic concrete earthing wire-selecting of a cover and the combination of adaptive earthing line selection algorithm the day after tomorrow.
Fig. 4 is an earthing wire-selecting auto-adaptive control theory block diagram of the present invention.This adaptive control system mainly is made up of controller 1, controlled device 2, self adaptation device 3 and feedback control loop and self-adaption loop.Unusual or troubleshooting result feeds back to the self adaptation device by gathering input (or auxiliary man-machine interaction and communication); the self adaptation device is according to the feedback result correcting process; and carry out and revise or set up unusual or the special electronic record record of fault, according to revising or the storage of newly-built record outcome record.In the embodiment of patent of the present invention is handled like this; abnormal alarm or fault alarm processing have been made according to original comprehensive route selection principle criterion; result according to the feedback computing; Automatic Program is made the conclusion that original judgement belongs to erroneous judgement; again revise Analysis of Policy Making and handle, carry out comprehensive criterion reorganization, the correction of criterion parameter, revise behaviors such as unusual or the special electronic record record of fault.
Based on adaptive control thought, set up stage by stage and revise and improve the special electronic record of earthing wire-selecting record algorithm model.Second stage comprises sets up automatic recognition mechanism, uses preceding concrete test by the scene, obtains the concrete various data parameters of each circuit.In actual field, the normal condition parameter of various circuits is different in different poses and with different expressions because of length difference, cabling environment.In the route selection field test process after equipment is installed, obtain the residual voltage of each concrete circuit, the nasty zero sequence electric current, the capacitive zero-sequence current, zero-sequence current and residual voltage angle, zero sequence active power, zero sequence reactive power and Zero-pharse harmonic power, multiple parameters such as Zero-pharse harmonic electric energy, calculate each line impedance, capacitive reactance, induction reactance, the phase angle, power, serial characteristic parameter such as harmonic wave, automatically discern NUS, NRS, the feature difference of different classes of earthing wire-selecting system such as NES and same kind, and set up the special electronic record record of concrete earthing wire-selecting that comprises these characteristic parameters.In the daily real-time use of phase III, revise or the special electronic record record of newly-built earthing wire-selecting, feed back by anomalous event, event of failure, output result in the use, and auxiliary man-machine interface and communication input, compare with the decision-making of the special electronic record record of former earthing wire-selecting, real-time judge is discerned each concrete circuit synthetic operation state.
Fig. 5 is the embodiment microcontroller circuit block diagram of patent of the present invention, adopt the high-performance microcontroller dsPIC30f6014A (including DSP nuclear) of the little core of the U.S. (MCROCHIP) company in this concrete patent of invention embodiment, this microcontroller and electric energy computation chip combination mutually are the hardware technology cores of patent of the present invention.The homemade electric energy computation chip ATT7022D of high-performance that this embodiment adopts Zhuhai torch power company to produce, this chip functions is powerful, and there is the ADC transducer and the DSP arithmetic processor of circuit such as filtering, phase shift and 19 sampling precisions inside.After collecting electric weight such as various voltages, electric current, in chip internal DSP computing.Microprocessor can by the SPI communication port directly in the ATT7022D chip electric energy register read concrete numerical result such as various electric currents, voltage, power, phase angle, power factor, fundamental energy, harmonic electric energy, also can read state values such as the phase failure, phase sequence, power direction.This microarray biochip sample frequency is up to 3.2Ksps, and a length is (24) metadata cache memory block of 240 in addition, is used for preserving in real time original sampling data, directly gathers for microcontroller.
In the patent of the present invention the electric energy computation chip diversity is used, electric energy computation chip circuit A is an electric energy computation chip earthing wire-selecting mode of operation (structure) shown in Figure 1 among Fig. 5, electric energy computation chip circuit B is the conventional metered dose mode of operation to this chip among Fig. 5, and this species diversity purpose of design is to ensure that patent of the present invention can obtain abundant parameter type.This microcontroller circuit is also directly gathered electric weight such as voltage, electric current simultaneously, in the unusual or fault Analysis of Policy Making, as the supplementary means flexible Application, obtains other parameters that electric energy computation chip can not provide at important parameter.Patent right of the present invention is not limited to the special-purpose computation chip circuit working of these the two kinds of electric energy mode that this embodiment adopts.
The main task of microprocessor no longer is that lot of data is gathered computing, and mainly is to read concrete electric weight comprehensive state parameter from electric energy computation chip, carries out earthing wire-selecting algorithm decision-making treatment according to various algorithm operational formulas.Adopt two microcontroller architectures, man-machine interfaces such as special CPU management processes and displays, button, management, communication work of treatment.CPU management has multiple communication function, and this concrete contrive equipment CPU management adopts the ARM chip, and design has communication drive circuits such as 485 communications, 232 communications, CAN communication.Also comprising the variable connector amount in the patent of the present invention gathers and the switching value output control circuit.
Claims (10)
1. high accuracy small current earthing wire-selecting method and the device chatted is characterized in that: the novel hardware configuration that adopts " the special-purpose electric quantity acquisition treatment circuit of microcontroller+special-purpose electric energy computation chip+earthing wire-selecting ".
2. the special-purpose electric quantity acquisition treatment circuit of the earthing wire-selecting of chatting as claim 1, it is characterized in that designing a kind of new earthing wire-selecting mode of operation: the electric energy computation chip input is connected with residual voltage, zero-sequence current acquisition process circuit, and special the measurement handled the electrical parameter relevant with earthing wire-selecting.Electric energy computation chip current input terminal (Ia, Ib, Ic) connects the outgoing zero-sequence current that belongs to one section bus together respectively; This bus residual voltage U0 after adjusting processing of circuit, be divided into independently and with U0 equal and opposite in direction, multiple branches that phase place is identical, receive the voltage input end (Ua, Ub, Uc) of this computation chip respectively.
3. the residual voltage U0 that chats as claim 2 is characterized in that adopting voltage follower or the similar output voltage electric weight identical with input voltage of can realizing to adjust circuit through adjusting circuit.
4. the novel hardware configuration of chatting as claim 1 is characterized in that also auxiliary electric energy computation chip conventional usage, i.e. input sample three-phase voltage, the three-phase current signal that has comprised in the earthing wire-selecting field.
5. high accuracy small current earthing wire-selecting method and the device chatted is characterized in that comprising the software approach of being set up and revised special multi-parameter earthing wire-selecting electronic record record by software automatically.
6. the multi-parameter earthing wire-selecting electronic record record of chatting as claim 5, but it is characterized in that this special electronic record record is made up of multiple earthing wire-selecting electrical parameter such as residual voltage, zero-sequence current, Zero-pharse harmonic electric energy and multiple recognition feature parameters such as grounding system type feature, difference characteristic.This record is stored in the special nonvolatile memory such as FLASH automatically.
7. high accuracy small current earthing wire-selecting method and the device chatted is characterized in that adopting the earthing wire-selecting combinational algorithm based on the multiselect line method associated treatment of electric energy computation chip technology.
8. high accuracy small current earthing wire-selecting method and the device chatted is characterized in that setting up the self-adaptive controlled making mechanism of earthing wire-selecting based on the special earthing wire-selecting electronic record record that can revise, can be newly-built.
9. the self-adaptive controlled making mechanism of earthing wire-selecting as claimed in claim 8 is characterized in that based on adaptive control thought, sets up and revise the algorithm model that improves special electronic record record of earthing wire-selecting and the combination of adaptive earthing line selection algorithm stage by stage.
10. high accuracy small current earthing wire-selecting method and the device chatted, it is characterized in that comprising recognition mechanism automatically, comprise the feature difference of identification between isolated neutral system (NUS), neutral point resistance grounded system (NRS) and neutral by arc extinction coil grounding system on-the-spot actual characteristic types such as (NES are called resonant earthed system again) and the same type etc.
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| CN102981105A (en) * | 2012-12-25 | 2013-03-20 | 南京因泰莱电器股份有限公司 | Low current earth routing system based on CAN |
| CN103412238A (en) * | 2013-06-28 | 2013-11-27 | 广东电网公司茂名供电局 | Self-adaptive small current grounding line selection method |
| CN107315128A (en) * | 2016-04-26 | 2017-11-03 | 国网辽宁省电力有限公司大连供电公司 | A kind of distributed earthing wire-selecting method and system based on GOOSE |
| CN107480298A (en) * | 2017-08-30 | 2017-12-15 | 北京恒华龙信数据科技有限公司 | A kind of electric quantity data restorative procedure and device |
| CN108847656A (en) * | 2018-06-22 | 2018-11-20 | 贵州电网有限责任公司 | Distribution selective grounding protection system based on adaptive dynamic contribution rate |
| CN109596943A (en) * | 2018-12-26 | 2019-04-09 | 临涣焦化股份有限公司 | A kind of novel high-pressure Small Electric Current Earthing And Routing Device |
| CN110887994A (en) * | 2019-11-28 | 2020-03-17 | 国网四川省电力公司攀枝花供电公司 | Method and system for obtaining system harmonic impedance |
| CN113625115A (en) * | 2021-08-16 | 2021-11-09 | 广西电网有限责任公司 | Low-current ground fault line selection system based on scheduling data |
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