CN202167841U - High precision intelligent grounding line selection device based on electric energy metering chip technology - Google Patents
High precision intelligent grounding line selection device based on electric energy metering chip technology Download PDFInfo
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- CN202167841U CN202167841U CN2011200173498U CN201120017349U CN202167841U CN 202167841 U CN202167841 U CN 202167841U CN 2011200173498 U CN2011200173498 U CN 2011200173498U CN 201120017349 U CN201120017349 U CN 201120017349U CN 202167841 U CN202167841 U CN 202167841U
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Abstract
The utility model discloses a high precision intelligent grounding line selection device based on the electric energy metering chip technology, and relates to the field of power distribution network undercurrent grounding line selection technology. Firstly, a grounding line selection circuit structure (or referred to as a grounding line selection working mode of an electric energy metering chip) based on the electric energy metering chip is designed. In the above structure, a front end analog input pin of the electric energy metering chip is connected with a zero sequence voltage acquisition circuit and a related zero sequence current acquisition circuit, and at the same time, a microcontroller is connected with the electric energy metering chip via a special-purpose communication port. The high precision grounding line selection device is designed with the structure of the microcontroller plus the grounding line selection circuit based on the electric energy metering chip being the hardware core. Under the basis of the novel circuit structure, the precision of the comprehensive line selection is improved via the combined criterion algorithm coprocessed by multiple line selection methods, and the intelligent and effective line selection under various complex grounding conditions is realized.
Description
Technical field:
The utility model relates to power distribution network small current earthing wire-selecting observation and control technology, also relates to the technological marginal technology field of blending mutually with the earthing wire-selecting technology of electric energy computation chip.
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 the earth resistance earthing mode; Utilize the zero sequence excess current principle to be grounded error protection; Along with the continuous input of city cable circuit, capacitance current increases rapidly, and the arc suppression coil that has begun to adopt automatic tuning is with the building-out capacitor electric current; And, proposed to utilize Prony method and wavelet transformation with the protection scheme of the information (like 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 to the research of ground connection fault line detection principle and device, 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 " principle.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, the beginning of the nineties to start the application climax of " small current earthing wire-selecting technology " to small current earthing wire-selecting in the appearance of microcomputer, and 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, route selection technology rich 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 practical application 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.
To the problem that the earthing wire-selecting technology industry faces, domestic and international technos generally believes the route selection technology, and rich is 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 under complicated ground connection situation, accurately judge faulty line.
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, is microscope, the magnifying glass in power technology field.In recent years, along with the increasingly high and global attention to green energy resource of intelligent electric power management expectancy, 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 to 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.
The utility model patent content:
The purpose of the utility model is to provide a cover high-precision intelligent type small current earthing wire-selecting product device; Solve Detection of weak processing and integrity problem from hardware configuration innovation and software approach innovation, realize high accuracy, high accuracy intelligence earth fault line selection.
On realizing, chat purpose, the content of the utility model comprises following a few part, and the utility model scope also comprises the similar implementation method that claims comprise.
One of the utility model content is novel key circuit structure design: based on the earthing wire-selecting special circuit structure (pattern) of electric energy computation chip.Like accompanying drawing 1, electric energy computation chip front end analog input pin is connected with residual voltage, zero-sequence current acquisition process circuit respectively, the special measurement processing electrical parameter relevant with earthing wire-selecting.Residual voltage obtains the multiple branches output voltage identical with bus residual voltage U0 through functions such as voltage follower adjustment treatment circuit, is connected with computation chip voltage input pin respectively again.Also comprised the conventional usage of electric energy computation chip shown in accompanying drawing 4 in the utility model, promptly the analog input pin connects sampling phase voltage, phase current signal.Simultaneously in this patent microcontroller dsPIC30f6014A also through inside nearly 12 analog acquisition passages of 16 tunnel directly gather electric weight such as voltage, electric current; At important parameter in the unusual or fault Analysis of Policy Making; As the supplementary means flexible Application, a small amount of other parameters that high speed is obtained and the electric energy supplement computation chip is not suitable for providing.
Two of the utility model content is on technical method one basis, and design is also adopted " microcontroller+based on the earthing wire-selecting circuit of electric energy computation chip " hardware configuration.High-performance microcontroller and special-purpose electric energy computation chip are that core improves the sensitivity of measurement device system and the high accuracy of data processing, solve the earthing wire-selecting Detection of weak and handle and integrity problem.The special-purpose electric energy computation chip (as: Zhuhai torch power ATT70xx family chip) of the middle and high end electric energy that the utility model adopts; Through inner high-precision adc analog-to-digital conversion module come to the signals such as electric current, voltage, phase place of input sample, processing such as filtering or phase shift, the DSP digital signal processing unit is accomplished the computing of whole electrical energy parameters.Multi-parameter operation result and the original sampling data that needs are stored in the relevant register and carry out exchanges data through special-purpose communication interface (like the SPI interface) and external microcontroller.The high accuracy parameter that the utility model microcontroller 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.
" microcontroller+based on the earthing wire-selecting circuit of electric energy computation chip " structure that the utility model patent adopts is that the realization of earthing wire-selecting integration algorithm provides a kind of high accuracy hardware platform.This special a large amount of core datas that circuit structure provided are crucial multi-parameter set relevant with earthing wire-selecting: mainly comprise residual voltage; 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; The crucial electrical parameter of multiple earthing wire-selectings such as Zero-pharse harmonic electric energy.
In the utility model technical scheme, the required measurement parameter of microcontroller generally directly reads acquisition from special-purpose computation chip hardware result of calculation.The special-purpose measurement technology chip technology of electric energy detects " microscope " new technology as a kind of high accuracy electric weight; Be particularly suitable for the detection acquisition process of faint electric quantity signal; Its hardware calculation process technology than microcontroller more speciality and can obtain more abundant earthing wire-selecting critical data in accurate Calculation.This technical scheme frees microcontroller from a large amount of complicated work such as the collection of traditional embedded design, calculating, specialize in the comprehensive route selection data algorithm decision-making treatment work of rear end.
Three of the utility model content be one of content, two hardware platform basis on; Particularly the earthing wire-selecting circuit mechanism based on electric energy computation chip is the basis, adopts the earthing wire-selecting combinational algorithm based on the multiple selection method associated treatment of electric energy computation chip technology.Microcontroller obtains the multi-parameter pinpoint accuracy data result relevant with route selection through special-purpose communication port from special-purpose electric energy computation chip; The high accuracy earthing wire-selecting parameter of enriching that microcontroller utilizes electric energy computation chip to provide is carried out the route selection calculation process, the comprehensive employing: intelligent 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 multiple effective ways such as width of cloth phase comparing methods.The utility model design specific embodiments is respectively type grounding systems such as NUS, NES and NRS and selects the line selection algorithm combination that result of use is excellent, cooperative compensating property is strong.Earth fault type according to various complicacies; From faint signal, accurately extract useful information, make every kind of method all be directed against the concrete characteristics of signal separately, each method cooperative compensating; Improve the accuracy of comprehensive route selection, realize the effective route selection under the various complicated grounding requirements.
Further specify the utility model content below in conjunction with accompanying drawing and concrete utility model embodiment.
Description of drawings:
Fig. 1 is special-purpose electric energy computation chip earthing wire-selecting mode of operation (structure) figure of the utility model indication
Fig. 2 is the technological hardware plan block diagram of the utility model
Fig. 3 is the general procedure flow chart of the utility model
Fig. 4 is the embodiment microcontroller circuit block diagram of the utility model
Embodiment
The utility model specific embodiments is following:
With reference to Fig. 1, this is the earthing wire-selecting electrical block diagram based on electric energy computation chip that the utility model uses the three-phase electrical energy computation chip design.Each electric energy computation chip input termination 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 the adjustment processing of circuit, receives the voltage input end of electric energy computation chip respectively, and I0n, I0n+1, I0n+2 receive the current input terminal of 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 that multichannel adjustment circuit output voltage is identical (phase place is identical, equal and opposite in direction) with 1 road input voltage.The utility model patent right is not limited to the voltage follower adjustment circuit that this embodiment adopts, and comprises that also other can the output voltage adjustment circuit identical with input voltage.
Device in the utility model specific embodiments comprises one or more circuit board module; Each circuit board module comprises one or more electric energy computation chip route selections working cell; The utility model patent specific embodiments is designed to 1～6 route selection working cell, and 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 the technical scheme hardware block diagram of the utility model.As shown in the figure, this device is a hardware core with microcontroller and special-purpose electric energy computation chip, and special-purpose electric energy computation chip is connected through the SPI communication port with microcontroller; Branch's output of same electric energy computation chip voltage input pin connection bus residual voltage adjustment circuit, the electric current input pin connects each the outlet zero-sequence current sampled signal circuit that belongs to this bus together; The utility model also has the electric energy computation chip custom circuit, and both computation chip analog input pin connected phase voltage, phase current signal Acquisition Circuit; The also selectable inner ADC passage of microcontroller that is designed with of the utility model directly connects the electric quantity acquisition treatment circuit simultaneously, is used for auxiliary a small amount of relevant electrical parameter of gathering fast.Comprise warning output circuit, control protection electric circuit, switch acquisition treatment circuit, switching value output control circuit and communicating circuit etc. in the present invention's technology hardware plan.
Fig. 3 is the general procedure flow chart of the utility model.The program circuit of the utility model 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 have 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 is reported to the police and troubleshooting] 6; And carry out [event of failure triggers, and revises the electronic record record] 8, revise or set up special electronic record selectively; Carry out result [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, get into new round circulation.
Fig. 4 is the embodiment microcontroller circuit block diagram of the utility model patent; This embodiment circuit adopts the high-performance microcontroller dsPIC30f6014A (including DSP nuclear) of the little core of the U.S. (MCROCHIP) company, and it is the hardware technology core of the utility model that this microcontroller and electric energy computation chip are worked in coordination.This embodiment adopts Zhuhai homemade high-performance electric energy computation chip ATT7022D of torch power company.This embodiment is utilized the ADC transducer and the DSP arithmetic processor of circuit such as the inner special filtering of this electric energy computation chip, phase shift and 19 sampling precisions; After gathering the electric weight analogues value such as various residual voltages, zero-sequence current, by the computing of chip internal DSP hardware.Microprocessor through the SPI communication port directly in the ATT7022D chip each electric energy register read concrete numerical result such as various zero-sequence currents, residual voltage, homopolar power, zero sequence electric energy, homopolar power factor, zero sequence fundamental energy, Zero-pharse harmonic electric energy, also can read state values such as the meritorious direction of zero sequence, the idle direction of zero sequence.This microarray biochip sample frequency is up to 3.2K, and a length is (24) metadata cache memory block of 240 in addition, is used for preserving in real time original sampling data, supplies microcontroller directly to read.
In the utility model patent to the multi-mode structural design of electric energy computation chip; 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. 4; Electric energy computation chip circuit B is the conventional metered dose mode of operation to this chip among Fig. 4, and this species diversity purpose of design is to ensure that the utility model patent obtains popularity, the diversity of parameter type.Simultaneously microcontroller dsPIC30f6014A also through inside nearly 12 analog acquisition passages of 16 tunnel directly gather electric weight such as voltage, electric current; At important parameter in the unusual or fault Analysis of Policy Making; As the supplementary means flexible Application, other parameters that high speed is obtained and the electric energy supplement computation chip is not suitable for providing.The utility model patent right is not limited to the special-purpose computation chip circuit working of these the two kinds of electric energy mode that this embodiment adopts.
Microprocessor is read concrete electric weight comprehensive state parameter from electric energy computation chip, carries out route selection work special disposal according to various algorithm operational formulas.The utility model adopts dual-cpu structure, man-machine interfaces such as special CPU management processes and displays, button, management, communication work of treatment.Design of hardware and software and the Q/GDW-2009 of State Grid Corporation of China series standard are compatible; CPU management has multiple communication function; This concrete utility model device management CPU adopts ARM chip, and design packet contains communication drive circuits such as 485 communications, 232 communications, GPRS, Ethernet, infrared, CAN communication.The utility model also comprises the variable connector amount and gathers and the switching value output control circuit.
Claims (3)
1. high-precision intelligent earthing wire-selecting equipment based on electric energy computation chip technology; The high-precision intelligent earthing wire-selecting equipment of being chatted is characterized in that electric energy computation chip front end analog input pin is connected with residual voltage, zero-sequence current acquisition process circuit respectively; Microcontroller is connected with electric energy computation chip through the private communication mouth, the novel grounded finding circuit structure of formation " microcontroller+based on the earthing wire-selecting circuit of electric energy computation chip ".
2. the high-precision intelligent earthing wire-selecting equipment of chatting according to claim 1 based on the electric energy computation chip technology; It is characterized in that in earthing wire-selecting circuit structure based on electric energy computation chip; The output of same electric energy computation chip voltage input pin connection bus residual voltage adjustment circuit, the electric current input pin connects each the outlet zero-sequence current acquisition process circuit that belongs to this bus together.
3. the high-precision intelligent earthing wire-selecting equipment of chatting according to claim 1 based on the electric energy computation chip technology is characterized in that microcontroller chip is also auxiliary through its analog quantity input pin connection phase voltage, phase current acquisition process circuit.
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| CN2011200173498U CN202167841U (en) | 2011-01-20 | 2011-01-20 | High precision intelligent grounding line selection device based on electric energy metering chip technology |
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| CN2011200173498U CN202167841U (en) | 2011-01-20 | 2011-01-20 | High precision intelligent grounding line selection device based on electric energy metering chip technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409978A (en) * | 2014-12-01 | 2015-03-11 | 国网上海市电力公司 | Circuit microcurrent query energy consumption reduction system of power distribution cabinet |
| CN106291231A (en) * | 2016-07-22 | 2017-01-04 | 安徽亚辉电气自动化有限公司 | A kind of measuring-controlling and analyzing system based on Small Electric Current Earthing And Routing Device |
| 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 |
-
2011
- 2011-01-20 CN CN2011200173498U patent/CN202167841U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409978A (en) * | 2014-12-01 | 2015-03-11 | 国网上海市电力公司 | Circuit microcurrent query energy consumption reduction system of power distribution cabinet |
| CN106291231A (en) * | 2016-07-22 | 2017-01-04 | 安徽亚辉电气自动化有限公司 | A kind of measuring-controlling and analyzing system based on Small Electric Current Earthing And Routing Device |
| 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 |
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