CN103293374A - Three-phase access type electric energy meter with electronic transformers and metering method for three phase access type electric energy meter - Google Patents
Three-phase access type electric energy meter with electronic transformers and metering method for three phase access type electric energy meter Download PDFInfo
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- CN103293374A CN103293374A CN2013102194011A CN201310219401A CN103293374A CN 103293374 A CN103293374 A CN 103293374A CN 2013102194011 A CN2013102194011 A CN 2013102194011A CN 201310219401 A CN201310219401 A CN 201310219401A CN 103293374 A CN103293374 A CN 103293374A
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Abstract
The invention provides a three-phase access type electric energy meter with electronic transformers and a metering method for the three-phase access type electric energy meter. The metering method includes respectively enabling a resistance voltage dividing electronic voltage transformer and an electronic current transformer to access each of a phase A, a phase B and a phase C of a three-phase power grid to form three-element power grid parameter detection units with the electronic transformers; enabling analog voltage signals outputted by secondary sides of the electronic transformers to access the three-phase intelligent electric energy meter so that electric energy can be metered. The three-phase intelligent electric energy meter with the electronic transformers and the metering method have the advantages that a three-phase four-wire three-element metering mode is adopted for the three-phase intelligent electric energy meter, so that the problem of erroneous metering of double three-phase three-wire elements under an unbalanced load condition is thoroughly solved, the problem of power stealing loopholes is solved, and high-precision and high-reliability metering can be implemented.
Description
Technical field:
The invention belongs to the electric energy metrical field, be specifically related to the intelligent electric energy meter for the weak voltage analog signal of metering electric mutual inductor secondary side output, is a kind of electric energy meter of novel quantitative model.
Background technology:
In three phase network, especially when the metering system of 6kV, 10kV, 35kV mesolow electrical network is gathered the primary side electrical network parameter, electric mutual inductor adopts the electric resistance partial pressure principle, the nanometer conductive material of utilization company independent intellectual property right, lower than traditional electromagnetic transformer power consumption, volume weight is littler, the spillage of material of self still less and safer, therefore use electric mutual inductor can accomplish saving energy and decreasing loss and save copper, the iron material that belongs to the national strategy resource.
The electric mutual inductor metered scheme has the scheme of whole metering, and namely electric mutual inductor and metering electric energy meter are holistic metered scheme.This mode confinement is very big, if in electric mutual inductor or the metering electric energy meter damage is arranged, and then must integral replacing.Whole metered scheme must be carried out the overall precision verification, causes complex manufacturing, operates dangerous; Whole metered scheme is difficult to also realize that power supply department carries out regular check check in addition.
Also have phase three-wire three two elements metering method in traditional quantitative model, metering is wrong when unbalance load.Electrical network load in the reality is impossible balance, so phase three-wire three two elements metering method has a lot of limitation, also has a lot of stealing leaks simultaneously.
Summary of the invention:
The purpose of this invention is to provide a kind of high precision three-phase intelligent electric energy meter and metering method thereof that is applicable to electric mutual inductor, can solve the problem of the mistake metering of phase three-wire three two elements under the unbalance load situation, and can make electric mutual inductor obtain promotion and application widely, for copper, these strategic resources of iron of national grid saving energy and decreasing loss and saving country are made positive contribution.
The invention provides a kind of electric mutual inductor access type three-phase intelligent electric energy meter, described three-phase intelligent electric energy meter and electric mutual inductor are independently, and described electric energy meter adopts the quantitative model of three-phase four-wire system;
Further, described electric mutual inductor secondary side A, B, C voltage in three phases, current signal line and the neutral line insert described electric energy meter with the three-phase and four-line signal mode;
Further, described electric mutual inductor comprises electronic type voltage transformer and electronic current mutual inductor;
Further, the analog quantity voltage signal of described electronic type voltage transformer secondary side output is Vna, Vnb, Vnc, VN, and wherein the load voltage value of Vna, Vnb, three signals of Vnc is 2/
V or 4/
V, the analog quantity voltage signal of described electronic current mutual inductor secondary side output is Inva, Invb, Invc, VN, wherein the load voltage value of Inva, Invb, three signals of Invc is 4V;
Further, described electric energy meter comprises voltage follower, electric energy computation chip, microprocessor, display unit, storage unit, communication unit; The input end of wherein said voltage follower connects electric mutual inductor secondary side output terminal, the output terminal of described voltage follower is connected to the input end of described electric energy computation chip, the output terminal of described electric energy computation chip is connected to the input end of described microprocessor, and the output terminal of described microprocessor is connected to described display unit, storage unit and communication unit;
Further, described voltage follower is 2 or 3;
Further, the supply voltage of described voltage follower be ± more than the 12V;
The present invention also provides a kind of electric mutual inductor access type electric energy gauging method, described method is that A in the three phase network, B, the mutually every phase of C respectively insert an electric resistance partial pressure type electronic type voltage transformer and an electronic current mutual inductor, the electrical network parameter detecting unit of forming the three element electric mutual inductor, the analog quantity voltage signal access three-phase intelligent electric energy meter of electric mutual inductor secondary side output carries out electric energy metrical then;
Further, said method comprising the steps of:
1) converts high voltage signal to low voltage signal by electronic type voltage transformer;
2) convert big current signal to little current signal by electronic current mutual inductor;
3) above-mentioned low-voltage and little current signal and reference signal are imported together the voltage follower of electric energy meter;
4) described voltage follower exports electric energy computation chip to after pressing signal to handle to above-mentioned light current;
5) electric energy computation chip carries out the AD conversion and calculates, and obtains corresponding continuous data;
6) microprocessor is by spi bus control with read these continuous datas and analyze, data after analyzing are shown by LCD, and relevant data are stored in EEPROM and the FLASH storage chip, communicate by USART communication mode and background management system.
Advantage of the present invention is:
1) electric mutual inductor access type three-phase intelligent electric energy meter provided by the invention is the measuring apparatus that is independent of electric mutual inductor.It is to produce under light current press strip spare and calibration separately, and production technology is similar to the production technology that traditional electrical can be shown, and described three-phase intelligent electric energy meter is independent of electric mutual inductor, make things convenient for power supply department to carry out periodic inspection and check, so practicality is very strong.
2) electric mutual inductor access type three-phase intelligent electric energy meter provided by the invention adopts the three-element quantitative model of three-phase and four-line, solved the problem of the mistake metering of phase three-wire three two elements under the unbalance load situation completely, simultaneously also solve stealing leak problem, realized high precision, highly reliable metering.
Description of drawings:
Fig. 1 is the system architecture synoptic diagram of electric energy meter of the present invention;
Fig. 2 (a), Fig. 2 (b) are respectively the schematic diagrams that is connected of voltage follower and current transformer, voltage transformer (VT) among the present invention;
Fig. 3 be among the present invention three-phase and four-line through the typical wiring figure of electronic type voltage, current transformer access type.
Embodiment
Below with reference to Figure of description the specific embodiment of the present invention is elaborated:
Referring to Fig. 1, the invention provides a kind of electric mutual inductor access type three-phase intelligent electric energy meter, described electric energy meter comprises voltage follower, electric energy computation chip, microprocessor, display unit, storage unit, communication unit.Wherein the input end of voltage follower connects electric mutual inductor secondary side output terminal, the analog signals of electric mutual inductor secondary side output all is that light current is pressed form, undistorted when carrying out the AD conversion process for voltage analog signal a little less than guaranteeing, electric energy meter uses voltage follower to press signal to handle to this light current; The output terminal of voltage follower is connected to the input end of electric energy computation chip, analog quantity voltage signal after voltage follower is handled is exported to electric energy computation chip, carry out AD conversion and calculating by electric energy computation chip, obtain corresponding continuous data, the output terminal of electric energy computation chip is connected to the input end of microprocessor, the output terminal of microprocessor connects display unit respectively, storage unit and communication unit, microprocessor is by spi bus control and read these continuous datas and analyze, data after microprocessor will be analyzed show by LCD, and relevant data are stored in EEPROM and the FLASH storage chip, microprocessor communicates by USART communication mode and background management system, thereby has realized metering and the intellectualized operation of the voltage analog signal of electric mutual inductor output.
Wherein A, B, the mutually every phase of C respectively insert an electric resistance partial pressure type electronic type voltage transformer and an electronic current mutual inductor in the three phase network, the electrical network parameter detecting unit of forming the three element electric mutual inductor, the analog quantity voltage signal access electric energy meter of electric mutual inductor secondary side output measures then.The signal reference point of each electric mutual inductor secondary side output couples together as the neutral line, electric mutual inductor secondary side A, B, C voltage in three phases, current signal line and the neutral line are inserted electric energy meter with the three-phase and four-line signal mode, and electric energy meter measures with the three-phase and four-line quantitative model.The branch that passes through of voltage transformer (VT) is pressed in the secondary terminals side and produces a voltage V2:V2=K*V1 corresponding with distolateral voltage V1 once, and wherein, K is voltage change ratio; Voltage V2 '=K ' * I1*R that Current Transformer Secondary is distolateral, wherein I1 is once distolateral electric current, and K ' is transformer ratio, and R is the high precision small resistor.Adopt the three-phase and four-line quantitative model can solve wrong metering appears in traditional phase three-wire three quantitative model under the unbalance load situation problem.This is because in the three-phase and four-line circuit, if because the threephase load imbalance, causes the vector sum of three-phase current to be not equal to zero, i.e. Ia+Ib+IC=0 ≠ 0, and this part electric current will flow through the electric current of the neutral line, is zero-sequence component.
The method of described three-phase and four-line metering may further comprise the steps:
1) converts high voltage signal to low voltage signal by electronic type voltage transformer;
2) convert big current signal to little current signal by electronic current mutual inductor;
3) above-mentioned signal is imported the voltage follower of electric energy meter with reference signal;
4) voltage follower exports electric energy computation chip to after pressing signal to handle to above-mentioned light current;
5) electric energy computation chip carries out the AD conversion and calculates, and obtains corresponding continuous data;
6) microprocessor is by spi bus control with read these continuous datas and analyze, data after analyzing are shown by LCD, and relevant data are stored in EEPROM and the FLASH storage chip, communicate by USART communication mode and background management system.
As Fig. 1, shown in Figure 2, Vna, the Vnb of electric mutual inductor output, Vnc, Inva,
Invb, Invc, VN are the weak voltage analog signals of electronic type voltage transformer and the output of electronic current mutual inductor secondary side, and wherein VN is the neutral line of forming three-phase four-wire system.The analog quantity voltage signal of three-phase electric energy meter measuring resistance dividing electronic potential formula voltage transformer secondary side output is Vna, Vnb, Vnc, VN, and wherein Vna, Vnb, three signals of Vnc are 2/ with reference to the load voltage value of VN
V or 4/
The analog quantity voltage signal that V, three-phase electric energy meter measure the output of electronic current mutual inductor secondary side is Inva, Invb, Invc, VN, and wherein Inva, Invb, three signals of Invc are 4V with reference to the load voltage value of VN.
Because the output of electric mutual inductor secondary all is weak voltage analog signals, therefore using voltage follower to carry out signal handles, adopt above-mentioned load voltage value output to be fit to the input of the voltage follower among the present invention, if it is too big, because the working current of voltage follower amplifier final stage changes too greatly, degree of distortion is difficult guaranteeing, and above-mentioned magnitude of voltage is the voltage with reference to neutral line VN, is easy to obtain accurate variable under the state of laod unbalance; Voltage analog signal after the processing enters the ATT7022 electric energy computation chip and measures conversion, obtain corresponding electric quantity data and electrical network analog data, these data are transferred to microprocessor by spi bus and carry out intellectualized operations such as data analysis, demonstration, communication, storage.
Weak voltage analog signal inserts electric energy meter, and electric energy meter uses voltage follower that signal is handled, because 6 road input signals are arranged, thus need to use 2 of the voltage followers of integrated 4 passages, or 3 of the voltage followers of integrated 2 passages.Consider the situation that electric mutual inductor may transship, can export the 8V signal such as secondary side after 1 times of overload of electronic current mutual inductor, thus the supply voltage that voltage follower uses should be ± more than the 12V.
After voltage follower was handled input signal, electric energy meter carries out corresponding step-down to this signal to be handled, and makes signal satisfy the conversion requirement of ATT7022 electric energy computation chip AD mouth.
Electric mutual inductor access type three-phase intelligent electric energy meter provided by the invention is the measuring apparatus that is independent of electric mutual inductor.It is to produce under light current press strip spare and calibration separately, and production technology is similar to the production technology that traditional electrical can be shown, and described three-phase intelligent electric energy meter is independent of electric mutual inductor, make things convenient for power supply department to carry out periodic inspection and check, so practicality is very strong; And electric mutual inductor access type three-phase intelligent electric energy meter provided by the invention adopts the three-element quantitative model of three-phase and four-line, thoroughly solved the problem of the mistake metering of phase three-wire three two elements under the unbalance load situation, simultaneously also solve stealing leak problem, realized high precision, highly reliable metering.
Above content be in conjunction with embodiment to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. an electric mutual inductor access type three-phase intelligent electric energy meter is characterized in that described three-phase intelligent electric energy meter and electric mutual inductor are independently, and described electric energy meter adopts the quantitative model of three-phase four-wire system.
2. electric energy meter according to claim 1 is characterized in that, described electric mutual inductor secondary side A, B, C voltage in three phases, current signal line and the neutral line insert described electric energy meter with the three-phase and four-line signal mode.
3. electric energy meter according to claim 1 is characterized in that, described electric mutual inductor comprises electronic type voltage transformer and electronic current mutual inductor.
4. electric energy meter according to claim 1 is characterized in that, the analog quantity voltage signal of described electronic type voltage transformer secondary side output is Vna, Vnb, Vnc, VN, and wherein the load voltage value of Vna, Vnb, three signals of Vnc is 2/
V or 4/
V, the analog quantity voltage signal of described electronic current mutual inductor secondary side output is Inva, Invb, Invc, VN, wherein the load voltage value of Inva, Invb, three signals of Invc is 4V.
5. electric energy meter according to claim 1 is characterized in that, described electric energy meter comprises voltage follower, electric energy computation chip, microprocessor, display unit, storage unit, communication unit; The input end of wherein said voltage follower connects electric mutual inductor secondary side output terminal, the output terminal of described voltage follower is connected to the input end of described electric energy computation chip, the output terminal of described electric energy computation chip is connected to the input end of described microprocessor, and the output terminal of described microprocessor is connected to described display unit, storage unit and communication unit.
6. electric energy meter according to claim 5 is characterized in that, described voltage follower is 2 or 3.
7. electric energy meter according to claim 6 is characterized in that, the supply voltage of described voltage follower is ± and more than the 12V.
8. electric mutual inductor access type electric energy gauging method, it is characterized in that, described method is that A in the three phase network, B, the mutually every phase of C respectively insert an electric resistance partial pressure type electronic type voltage transformer and an electronic current mutual inductor, the electrical network parameter detecting unit of forming the three element electric mutual inductor, the analog quantity voltage signal access three-phase intelligent electric energy meter of electric mutual inductor secondary side output carries out electric energy metrical then.
9. electric energy gauging method according to claim 8 is characterized in that, said method comprising the steps of:
1) converts high voltage signal to low voltage signal by electronic type voltage transformer;
2) convert big current signal to little current signal by electronic current mutual inductor;
3) above-mentioned low-voltage and little current signal and reference signal are imported together the voltage follower of electric energy meter;
4) described voltage follower exports electric energy computation chip to after pressing signal to handle to above-mentioned light current;
5) electric energy computation chip carries out the AD conversion and calculates, and obtains corresponding continuous data;
6) microprocessor is by spi bus control with read these continuous datas and carry out
Analyze, the data after analyzing are shown by LCD, and relevant data are stored in EEPROM and the FLASH storage chip, communicate by USART communication mode and background management system.
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| CN107345975A (en) * | 2017-07-21 | 2017-11-14 | 国家电网公司 | A kind of method of electric energy metrical conversion equipment and the application device |
| CN107561326A (en) * | 2017-09-27 | 2018-01-09 | 四川德阳德仪电子仪器有限公司 | Electric power meter and power supply management system |
| CN108267624A (en) * | 2018-02-23 | 2018-07-10 | 南京飞腾电子科技有限公司 | Electronic electric energy meter |
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Application publication date: 20130911 |