CN103941062A - Three-phase intelligent power distributing meter and method for obtaining same - Google Patents
Three-phase intelligent power distributing meter and method for obtaining same Download PDFInfo
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- CN103941062A CN103941062A CN201410135085.4A CN201410135085A CN103941062A CN 103941062 A CN103941062 A CN 103941062A CN 201410135085 A CN201410135085 A CN 201410135085A CN 103941062 A CN103941062 A CN 103941062A
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Abstract
A three-phase intelligent power distributing meter comprises a voltage connector and a current connector which are connected with three-phase electricity, a simulation switching circuit which is connected with the voltage connector and the current connector through a high-input inductance circuit and a current sampling resistor respectively, a single-chip microcomputer which is used for controlling the input end of the simulation switching circuit to be gated so as to obtain information of each phase of voltage and information of each phase of current, and an electric energy measuring chip, a display circuit and a communication interface which are connected with the single-chip microcomputer, wherein the information of each phase of voltage and the information of each phase of current are connected with a set of data ports of the single-chip microcomputer through an analog-digital converter. According to the three-phase intelligent power distributing meter, information, namely, voltage, current, active power, passive power, power factor, temperature, humidity and time, of the three-phase electricity is obtained through an integrated structure; all data are in communication with a computer through the plug and play communication interface, and the three-phase intelligent power distributing meter is simple in structure, high in integration degree, high in reliability and safe in running. By means of the three-phase intelligent power distributing meter, traditional power distribution technologies which are far behind technologies in the information era step into the information era, and various existing power distribution cabinets are standardized.
Description
Technical field
The present invention relates to a kind of distribution instrument, especially relate to a kind of integral intelligent power distributing meter and its implementation with data communication function.
Background technology
Present known distribution instrument, no matter for example voltage table, reometer, power meter, power factor meter etc., be pointer-type or digital display instrument, all can only naked eyes reading, can not with computer communication.In addition, also there is the defect of power distribution cabinet complex structure, function singleness, although the intelligentized cry of distribution technique is very high, do not obtain all the time substantive breakthroughs.Known distribution technique pointer gauge, digital display meter mix, and differ 1-2 generation with intellectuality.Any upgrading about distribution technique, transformation all cannot be carried out smoothly.
Current era, science and technology is advanced by leaps and bounds, and makes rapid progress.Mobile phone changed for three or four generations between more than 20 years; Computer changed many generations and the replacement cycle shorter and shorter; Household electrical appliance also march toward the intelligent epoch already ...Have distribution instrument only, with the inherent first generation product of power technology---pointer gauge is also being propagated its belief on a large scale.The backwardness of distribution technique, has seriously restricted the development of distribution technique and high-end automatic control and associated every technology.
The invention provides a package solution, make distribution technique one step stride into the information age.
Summary of the invention
For overcoming the defect of prior art, the present invention propose a kind of simple in structure, integrated level is high and intelligent three-phase intelligent power distributing meter with data communication facility.
The present invention adopts following technical scheme to realize: a kind of three-phase intelligent power distributing meter.It comprises: the voltage connector being connected with three-phase electricity and current connector; The analog switching circuit being connected with voltage connector and current connector respectively by high input impedance circuit, current sampling resistor; Bring in for the input of controlling gating analog switching circuit the single-chip microcomputer that obtains each phase voltage and each phase current information, eight data lines of this single-chip microcomputer are connected with analog to digital converter; Be used for according to the electric energy computation chip of each phase voltage and each phase current information calculating applied power, active power, power factor and reactive power, this electric energy computation chip is connected with single-chip microcomputer; The display circuit being connected with single-chip microcomputer and communication interface.
Wherein, high input impedance circuit comprises: series resistor R1 and resistance R 4 between the A of voltage connector phase voltage output terminal and ground, and the K1 input end of the common port connecting analog on-off circuit of resistance R 1 and resistance R 4; Series resistor R2 and resistance R 5 between the B of voltage connector phase voltage output terminal and ground, and the K2 input end of the common port connecting analog on-off circuit of resistance R 2 and resistance R 5; Series resistor R3 and resistance R 6 between the C of voltage connector phase voltage output terminal and ground, and the K3 input end of the common port connecting analog on-off circuit of resistance R 3 and resistance R 6.
Wherein, resistance R 1, resistance R 2 have similar resistance with resistance R 3, and resistance R 4, resistance R 5 and resistance R 6 have similar resistance.
Wherein, described three-phase intelligent power distributing meter also comprises: the Temperature Humidity Sensor being connected with single-chip microcomputer.
Wherein, described three-phase intelligent power distributing meter also comprises: the timing circuit being connected with single-chip microcomputer and event timing switch.
Wherein, communication interface is USB interface.
In addition, the present invention proposes a kind of implementation method of three-phase intelligent power distributing meter, and it comprises the steps:
Single-chip Controlling is each input end of gating analog switching circuit successively, obtains successively each phase voltage and each phase current information of three-phase electricity;
The electric energy computation chip being connected with single-chip microcomputer calculates applied power and active power according to each phase voltage and each phase current information, and sends result of calculation to single-chip microcomputer, and single-chip microcomputer calculates power factor and reactive power according to applied power and active power again;
Single-chip microcomputer sends to display circuit to show each phase voltage of three-phase electricity and each phase current, active power, reactive power and power factor.
Wherein, the implementation method of described three-phase intelligent power distributing meter also comprises step: the switching display cycle of display circuit is set by single-chip microcomputer, and single-chip microcomputer sends to display circuit to show demonstration data according to the switching display cycle of setting.
Wherein, the implementation method of described three-phase intelligent power distributing meter also comprises step: single-chip microcomputer obtains temperature and humidity data from connected Temperature Humidity Sensor, and sends to display circuit to show.
Wherein, the implementation method of described three-phase intelligent power distributing meter also comprises step: single-chip microcomputer sends to computing machine by communication interface by each phase voltage and each phase current information calculating applied power, active power, power factor and reactive power.
Compared with prior art, the present invention has following beneficial effect:
1, highly integrated.In distribution engineering, will measure electric current, voltage, power, power factor, known means are all to adopt multilist system, and every table acts in accordance with the division of their functions and duties, as a means of safety.Can realize and the present invention realizes one meter system, overturn old tradition, can be rated as the comprehensive expression of person of power measurement.
2, computing replaces measurement.Known distribution instrument kind is numerous and diverse, and this also becomes one of intelligentized major obstacles of distribution.And the present invention electric energy computation chip ADE7763 records after applied power and active power, by computing method but not mensuration is tried to achieve power factor and reactive power.Not only simplify hardware configuration, and shown intelligent advantage.
3, simple in structure.Known power distribution cabinet back panel wiring reaches tens of, and assembling has high requirements, and the invention enables none root back panel wiring of intelligent power distribution table, need only 8 input lines, and wiring is very simple.
4, easy for installation.Known power distribution cabinet need be produced or senior electrician could install by power equipment factory, and the present invention greatly simplifies the installation of intelligent power distribution table, only need lift a finger, and installs very simple and easy.
5, powerful.Known power distribution cabinet, because technology and the cost reason overwhelming majority are without power class instrument, if desired perpetual calendar and timer also will install additional in addition.And the invention provides a universal easy, high, the powerful New Type of Intelligent Instrument of cost performance, include whole demands of distribution technique.
6, reliability is high.The power distributing meter that the present invention proposes, the operation of its each step be all that inventor sets and knows clearly, thereby has thoroughly prevented unexpected generation, reliability is high, guarantees security of operation and responding ability fast.
7, communication function.The present invention adopts integral structure, provides and the communication interface of compunication, and for communication function has been established good basis, and communication function one inserts and get final product, easy to use.
8, dislocation shows.The present invention adopts the method for staggering the time, and sets and switches the display cycle as required, switches and shows every energy data, and display effect is better.
9, regeneration product.Current known power distribution cabinet still adopts pointer instrument in a large number, or mixes part read out instrument.The two differed for 1-2 generations with intelligent information-based requirement.The present invention can make the informationization of known analog ligand power technology; Make the power distribution cabinet production standard of taking their own roads now.
Brief description of the drawings
Fig. 1 is the electrical block diagram of one embodiment of the invention.
Fig. 2 is the schematic diagram of the display panel of three-phase intelligent power distributing meter.
Fig. 3 is the realization flow figure of one embodiment of the invention.
Embodiment
The present invention proposes the intelligentized three-phase intelligent power distributing meter of a kind of distribution engineering for power industry.Voltage based on chip microcontroller three-phase electricity and the collection of electric current, and show that active power, reactive power, power factor even comprise the environmental parameters such as temperature humidity, have simple in structure, realize that cost is low, reliability is high, strong interference immunity and the high plurality of advantages of its communication ability.
As shown in Figure 1, in one embodiment, the three-phase intelligent power distributing meter that the present invention proposes comprises: the voltage connector J1 being connected with three-phase electricity, and the A phase of three phase network, B phase and C phase voltage are passed through respectively the input end K1 ~ K3 of high input impedance circuit connecting analog on-off circuit by this voltage connector J1; Three-phase electricity is not by current transformer (drawing in Fig. 1), the secondary winding of current transformer is connected with current connector J2, A phase current, B phase current and C phase current are accessed to the input end K4 ~ K6 of analog switching circuit by current connector J2, and the A phase current output terminal of current connector J2, B phase current output terminal and C phase current output terminal are respectively by current sampling resistor R7 ~ R9 ground connection; The single-chip microcomputer being connected with analog switching circuit, wherein 3 control ports 3 address wires of connecting analog on-off circuit respectively of this single-chip microcomputer, one of them the data of input end K1 ~ K6 that read analog switching circuit for gating at a time, the data of choosing are sent to single-chip microcomputer through 8 data lines by analog to digital converter after conversion; The Temperature Humidity Sensor, clock circuit and the electric energy computation chip that are connected with single-chip microcomputer respectively; The display circuit being connected with single-chip microcomputer by communication interface, and single-chip microcomputer can also communicate by this communication interface and outside computing machine, host computer etc.
Wherein, this voltage connector J1 has 4 input ends and 4 output terminals, these 4 input ends are connected with A phase, B phase, C phase and the center line of three phase network respectively, and the center line output head grounding of voltage connector J1, and other 3 output terminals are respectively by high input impedance circuit ground
.such as A phase voltage output terminal, B phase voltage output terminal, the C phase voltage output terminal of voltage connector J1 are connected in series rear ground connection by resistance R 1, resistance R 2 and resistance R 3 respectively with resistance R 4, resistance R 5 and resistance R 6, and resistance R 1, resistance R 2 have similar resistance (such as resistance is 10M ohm) with resistance R 3, and resistance R 4, resistance R 5 and resistance R 6 have similar resistance (such as resistance is 10K ohm); Resistance R 1 is connected with the input end K1 ~ K3 of analog switching circuit respectively with the common port of resistance R 6 with common port, the resistance R 3 of resistance R 5 with common port, the resistance R 2 of resistance R 4.A phase voltage, B phase voltage and C phase voltage are divided into the alternating voltage that produces hundreds of millivolts through high input impedance circuit, be sent to single-chip microcomputer successively keep in through analog switching circuit and analog to digital converter.Equally, three-phase current is sent into power distributing meter by current transformer, after low-impedance sample resistance, 1 ~ 5A current value is converted to a magnitude of voltage for millivolt level, is finally also sent to single-chip microcomputer through analog switching circuit and analog to digital converter successively and keeps in.
Wherein, timing circuit adopts DS1302 chip, can read easily, demonstration, recording time information and event timing moment.Temperature Humidity Sensor adopts current state-of-the-art three-wire system sensor, and circuit is simple, data are accurate.
Wherein, electric energy computation chip adopts ADE7763 chip.
As shown in Figure 2, in one embodiment, display circuit adopts 49 LED charactrons, on the display interface of electric energy meter, be used for respectively showing A phase voltage, B phase voltage, C phase voltage, A phase current, B phase current and C phase current, and active power, reactive power, power factor and current date and temporal information.
In addition, single-chip microcomputer also with an event timing switch S 1(such as being that relay is realized) be connected, for coordinating timing circuit to carry out timing or regularly to the time.If will automatically record the hang-up moment of certain equipment, two of a time switch line can be connected on the normally closed contact of relay.At energising open state, relay adhesive, normally closed contact disconnects (, now switch S 1 disconnects).As this equipment hang-up, relay power-off, normally closed contact closure (, now switch S 1 closure), just the moment was recorded at that time.For example within on 01 01st, 2014, become 18.42.56, represent that 18: 42: 56 event timing switch S 1 are triggered
; Press clear key and remove the timing moment, recover year, the moon, data.
The power distributing meter that the present invention proposes, is provided with regulating key in the positive upper right side of casing.There are 8 binding posts of two rows at the casing back side, three signal wires (A phase current, B phase current and C phase current) and the ground wire that access successively three pressure-wires (A phase voltage, B phase voltage and C phase voltage), zero line and come from current transformer, totally 8 lines, separately have two terminals part time switch S1 that takes over a job.The casing back side also has communication interface (such as USB interface), can send whole measurement data to computing machine.
Shown in Fig. 3, the workflow of power distributing meter mainly comprises: three-phase voltage produces the voltage of hundreds of millivolt through high input impedance circuit dividing potential drop, sends into three ports of analog switching circuit, extracts voltage data temporary for single-chip microcomputer in good time; Three-phase current produces the alternating voltage of hundreds of millivolts through sampling current sampling resistor, send into successively single-chip microcomputer temporary through analog switch current data; Single-chip microcomputer access electric energy computation chip (ADE7763 chip), the A phase voltage and electric current, B phase voltage and electric current, C phase voltage and the electric current that are gathered according to single-chip microcomputer by electric energy computation chip, calculate the value of applied power P0 and the value of active-power P 1, pass to single-chip microcomputer temporary; Single-chip microcomputer, according to formula COSQ=P1/P0, calculates power factor value, then according to reactive power P3=P0-P1, calculates reactive power value, and by temporary to the reactive power value calculating and power factor value.
In addition, the data of display circuit show the static display mode of employing.Single-chip microcomputer moment sends the data to 49 LED charactrons.Single-chip microcomputer can be accomplished " no matter send ", the overwhelming majority time for detection of and calculate, thereby process quick and safe.Applied power, active power, these three performance numbers of reactive power are such as within every 20 seconds, once switching (it is adjustable arbitrarily switching the display cycle) demonstration.Thereby in one minute, applied power, active power, reactive power data are shown complete in turn.And the power data Yi Feng of power distributing meter, paddy, flat time period slowly change, show that refresh rate needn't be too fast.Therefore, by given data through computing, draw power, power factor value temporary, single-chip microcomputer is also temporary to humiture data by P2.5 Port detecting, single-chip microcomputer reads time data temporary from DS1302 chip, then disposable total data is sent to 49 LED charactrons, total data is refreshed
;and by handover mechanism, total data is sent to computing machine from communication interface (such as USB interface), thereby realize and compunication.
To sum up, the three-phase intelligent power distributing meter that the present invention proposes has following useful technique effect:
1, highly integrated.In distribution engineering, will measure electric current, voltage, power, power factor, known means are all to adopt multilist system, and every table acts in accordance with the division of their functions and duties, as a means of safety
.and realizing one meter system, the present invention can realize.Overturn old tradition, can be rated as the comprehensive expression of person of power measurement.
2, computing replaces measurement.Known distribution instrument kind is numerous and diverse, and this also becomes one of intelligentized major obstacles of distribution.And the present invention electric energy computation chip ADE7763 records after applied power and active power, by computing method but not mensuration is tried to achieve power factor and reactive power, not only simplify hardware configuration, and shown intelligent advantage.
3, simple in structure.Known power distribution cabinet back panel wiring reaches tens of, and assembling has high requirements, and the invention enables none root back panel wiring of intelligent power distribution table, need only 8 input lines, and wiring is simple.
4, easy for installation.Known power distribution cabinet need be produced or senior electrician could install by power equipment factory, and the present invention greatly simplifies the installation of intelligent power distribution table, only need lift a finger, and installs very simple and easy.
5, powerful.Known power distribution cabinet, because technology and the cost reason overwhelming majority are without power class instrument.If desired perpetual calendar and timer also will install additional in addition.And the invention provides a universal easy, high, the powerful New Type of Intelligent Instrument of cost performance, include whole demands of distribution technique.
6, reliability is high.The power distributing meter that the present invention proposes, the operation of its each step be all that inventor sets and knows clearly, thereby has thoroughly prevented unexpected generation, reliability is high, guarantees security of operation and responding ability fast.
7, communication function.The present invention adopts integral structure, provides and the communication interface of computer communication, and for communication function has been established good basis, and communication function one inserts and get final product, easy to use.
8, dislocation shows.The present invention adopts the method for staggering the time, and sets and switches the display cycle as required, switches and shows every energy data, distinguishes disparity items with the LED light of synchronously switching, and display effect is better.
9, regeneration product.Current known power distribution cabinet still adopts pointer instrument in a large number, or mixes part read out instrument.The two differed for 1-2 generations with intelligent information-based requirement.The present invention can make the informationization of known analog ligand power technology; Make the power distribution cabinet production standard of taking their own roads now.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention.All any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a three-phase intelligent power distributing meter, is characterized in that, comprising: the voltage connector being connected with three-phase electricity and current connector; The analog switching circuit being connected with voltage connector and current connector respectively by high input impedance circuit, current sampling resistor; Bring in for the input of controlling gating analog switching circuit the single-chip microcomputer that obtains each phase voltage and each phase current information, eight data lines of this single-chip microcomputer are connected with analog to digital converter; Be used for according to the electric energy computation chip of each phase voltage and each phase current information calculating applied power, active power, power factor and reactive power, this electric energy computation chip is connected with single-chip microcomputer; The display circuit being connected with single-chip microcomputer and communication interface.
2. three-phase intelligent power distributing meter according to claim 1, it is characterized in that, high input impedance circuit comprises: series resistor R1 and resistance R 4 between the A of voltage connector phase voltage output terminal and ground, and the K1 input end of the common port connecting analog on-off circuit of resistance R 1 and resistance R 4; Series resistor R2 and resistance R 5 between the B of voltage connector phase voltage output terminal and ground, and the K2 input end of the common port connecting analog on-off circuit of resistance R 2 and resistance R 5; Series resistor R3 and resistance R 6 between the C of voltage connector phase voltage output terminal and ground, and the K3 input end of the common port connecting analog on-off circuit of resistance R 3 and resistance R 6.
3. three-phase intelligent power distributing meter according to claim 2, is characterized in that, resistance R 1, resistance R 2 have similar resistance with resistance R 3, and resistance R 4, resistance R 5 and resistance R 6 have similar resistance.
4. three-phase intelligent power distributing meter according to claim 1, is characterized in that, also comprises: the Temperature Humidity Sensor being connected with single-chip microcomputer.
5. three-phase intelligent power distributing meter according to claim 1, is characterized in that, also comprises: the timing circuit being connected with single-chip microcomputer and event timing switch.
6. three-phase intelligent power distributing meter according to claim 1, is characterized in that, communication interface is USB interface.
7. as an implementation method for claim 1-6 three-phase intelligent power distributing meter as described in any one, it is characterized in that, comprise the steps:
Single-chip Controlling is each input end of gating analog switching circuit successively, obtains successively each phase voltage and each phase current information of three-phase electricity;
The electric energy computation chip being connected with single-chip microcomputer calculates applied power and active power according to each phase voltage and each phase current information, and sends result of calculation to single-chip microcomputer, and single-chip microcomputer calculates power factor and reactive power according to applied power and active power again;
Single-chip microcomputer sends to display circuit to show each phase voltage of three-phase electricity and each phase current, active power, reactive power and power factor.
8. the implementation method of three-phase electric energy meter according to claim 7, it is characterized in that, also comprise step: the switching display cycle of display circuit is set by single-chip microcomputer, and single-chip microcomputer sends to display circuit to show demonstration data according to the switching display cycle of setting.
9. the implementation method of three-phase distribution table according to claim 7, is characterized in that, also comprises step: single-chip microcomputer obtains temperature and humidity data from connected Temperature Humidity Sensor, and sends to display circuit to show.
10. the implementation method of three-phase intelligent power distributing meter according to claim 7, it is characterized in that, also comprise step: single-chip microcomputer sends to computing machine by communication interface by each phase voltage and each phase current information calculating applied power, active power, power factor and reactive power.
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| CN201410135085.4A CN103941062A (en) | 2014-04-04 | 2014-04-04 | Three-phase intelligent power distributing meter and method for obtaining same |
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| CN201410135085.4A CN103941062A (en) | 2014-04-04 | 2014-04-04 | Three-phase intelligent power distributing meter and method for obtaining same |
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| CN105004912A (en) * | 2015-06-05 | 2015-10-28 | 武汉振道世纪科技有限公司 | Intelligent multi-source avometer |
| CN105924036A (en) * | 2016-04-21 | 2016-09-07 | 邹平县供电公司 | Outdoor electric meter installation cabinet |
| CN106950426A (en) * | 2017-05-03 | 2017-07-14 | 国网四川省电力公司电力科学研究院 | Three-phase electric energy meter and its measuring method based on wide area synchro measure |
| CN107037261A (en) * | 2017-05-03 | 2017-08-11 | 国网四川省电力公司电力科学研究院 | 0.2S level three-phase electric energy meters and its measuring method based on wide area synchro measure |
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