CN102692535A - Electric energy metering chip and three-phase four-wire electric energy meter - Google Patents
Electric energy metering chip and three-phase four-wire electric energy meter Download PDFInfo
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- CN102692535A CN102692535A CN2011100734529A CN201110073452A CN102692535A CN 102692535 A CN102692535 A CN 102692535A CN 2011100734529 A CN2011100734529 A CN 2011100734529A CN 201110073452 A CN201110073452 A CN 201110073452A CN 102692535 A CN102692535 A CN 102692535A
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Abstract
The invention is suitable for the power field and provides an electric energy metering chip and a three-phase four-wire electric energy meter. The chip comprises an error wiring detection module, a misphase error correction module, a power metering module and an electric energy metering module. Input terminals of the error wiring detection module and the misphase error correction module are connected with an A phase current, a B phase current, a C phase current, an A phase voltage, a B phase voltage and a C phase voltage respectively. An output terminal of the error wiring detection module is connected with the misphase error correction module. The output terminal of the misphase error correction module is connected with the power metering module. The error wiring detection module is used to detect whether a three-phase current and a three-phase voltage have a wiring error and send a wiring error result to the misphase error correction module so as to carry out error correction processing. The output terminal of the power metering module is connected with the input terminal of the electric energy metering module. By using the technical scheme provided in the invention, work reliability can be increased and metering accuracy can be improved.
Description
Technical field
The invention belongs to power domain, relate in particular to a kind of electric energy computation chip and three-phase and four-line electric energy meter.
Background technology
The three-phase and four-line electric energy meter need calculate active power, reactive power and applied power, and its integration is realized active energy metering, reactive energy metering and apparent electric energy metrical.Be illustrated in figure 1 as the correct wiring schematic diagram of three-phase and four-line electric energy meter of the prior art (hereinafter to be referred as electric energy meter).TA1, TA2, TA3 are the primary side current mutual inductor, and former limit is surveyed electric current through A phase current
B phase current
and C phase current
secondary through A phase current
B phase current
and C phase current
and is input to electric energy computation chip current channel input end through behind the current transformer; A phase voltage
B phase voltage
C phase voltage
is input to electric energy computation chip through behind the electric resistance partial pressure, and the voltage
behind
electric resistance partial pressure is input to electric energy computation chip voltage channel input end; Electric energy computation chip is accomplished active power and reactive power, the calculating of applied power, and its integration obtained active energy, reactive energy and apparent electric energy.
Because the wiring of three-phase and four-line electric energy meter is accomplished by manual work, easy wiring error during on-the-spot the installation, some wiring error can cause the three-phase and four-line table not worked; Some wiring error can cause three-phase and four-line statistical tables and reports decompression, defluidization, and the fault of the phase failure etc., these false wirings are all better investigated; But some wiring error will cause three-phase and four-line electric energy meter endure also not report fault; But it is undesired in fact to work; Error is very big, causes measuring mistake, and this type wiring error often is difficult for investigation; Cause existing electric energy computing method accurately to measure; The electric energy metrical mistake occurs, for example: exchange like B phase and C phase voltage terminal wrong, then general power
causes general power metering mistake.
Summary of the invention
The object of the present invention is to provide a kind of electric energy computation chip, be intended to solve the electric energy meter that the wiring error of electric energy meter causes in the prior art and do not work, measure wrong problem.
The present invention is achieved in that electric energy computation chip, and said electric energy computation chip comprises: false wiring detection module, misphase correction module, power measurement module, electric energy metrical module;
Wherein, The input end of said false wiring detection module and said misphase correction module is connected with A phase current
B phase current
C phase current
A phase voltage
B phase voltage
C phase voltage
respectively, and the output terminal of said false wiring detection module is connected with said misphase correction module; The output terminal of said misphase correction module is connected with said power measurement module; Said false wiring detection module is used to detect three-phase current and whether three-phase voltage wiring error takes place, and this wiring error result is sent to said misphase correction module carries out correction process;
The output terminal of said power measurement module is connected with the input end of electric energy metrical module
The present invention also provides a kind of three-phase and four-line electric energy meter, comprises microprocessor MCU, display module, communication module, memory module and real-time clock RTC, and said electric energy meter comprises above-mentioned electric energy computation chip;
Wherein, said electric energy computation chip, said display module, said communication module, said memory module and said real-time clock RTC all are connected with said MCU.
The present invention compared with prior art; Beneficial effect is: because technical scheme of the present invention is when artificial Miswire; Detect the mistake of line by the false wiring detection module, the misphase testing result is sent to the misphase correction module, the misphase correction module is carried out the misphase error correction according to this testing result; Make electric energy computation chip to improve the accuracy of electric energy meter functional reliability and electric quantity metering with correct wiring work.
Description of drawings
The wiring diagram of the three-phase and four-line electric energy meter that Fig. 1 provides for prior art;
Fig. 2 is the structural drawing of electric energy computation chip provided by the invention;
Fig. 3 is the structural drawing of false wiring detection module provided by the invention;
Fig. 4 is a misphase correction module structural drawing provided by the invention;
Fig. 5 is an anti-phase correction module structural drawing provided by the invention;
Fig. 6 is the structural drawing of three-phase and four-line electric energy meter provided by the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Can't work or the wrong problem of electric energy meter metering in order to solve the electric energy meter that three-phase and four-line electric energy meter wiring error causes; The present invention increases false wiring detection module and misphase correction module in existing three-phase and four-line electric energy meter; Wherein wrong link detection module detects the connection error of three-phase current, voltage terminal; The misphase correction module is according to the testing result adjustment three-phase current of wrong link detection module, the annexation of voltage; Correct Miswire, make that electric energy meter can operate as normal, accurate measurement.For example, during like B phase and the exchange of C phase voltage terminal wrong, mistake link detection module detects the B phase and C phase voltage terminal wrong exchanges, and this testing result is sent to correction module, and correction module is with B phase and the exchange of C phase voltage.
Through accompanying drawing concrete structure of the present invention is described below, shown in this electric energy computation chip such as Fig. 2 (wherein, dotted line is represented optional module), is comprised:
False wiring detection module 21, misphase correction module 22, power measurement module 23, electric energy metrical module 24;
Wherein, The input end of false wiring detection module 21 and misphase correction module 22 is connected with A phase current
B phase current
C phase current
A phase voltage
B phase voltage
C phase voltage
respectively; The output terminal of false wiring detection module 21 is connected with misphase correction module 22; The output terminal of misphase correction module 22 is connected with power measurement module 23; False wiring detection module 21 is used to detect three-phase current and whether three-phase voltage wiring error takes place, and this wiring error result is sent to misphase correction module 22 carries out correction process;
The output terminal of power measurement module 23 is connected with the input end of electric energy metrical module 24.
Need to prove that above-mentioned wiring error comprises: misphase and/or current reversal.
Optional, above-mentioned electric energy computation chip can also comprise: anti-phase correction module 25; The input end of anti-phase correction module 25 is connected with the output terminal of false wiring detection module 21; The input end of anti-phase correction module 25 also is connected with the reactive power output terminal with the active power output terminal of power measurement module, and the output terminal of anti-phase correction module 25 is connected with the input end of electric energy metrical module 24; This anti-phase correction module 25 is the anti-phase correction module 25 that can correct current reversal according to the testing result of false wiring detection module 21 in addition;
Optional, the concrete structure of false wiring detection module 21 is as shown in Figure 3, comprising: measurement of angle submodule 211, amplitude measurement submodule 212 and error connection line are judged submodule 213;
Which angle measurement sub-module 211 and amplitude measurement sub-module 212, respectively, the input of the A-phase current
B-phase current
C-phase current
A phase voltage
B-phase voltage
C-phase voltage
Connection; angular measurement sub-module 211 and amplitude measurement output sub-module 212 ends with an error connect sub-module 213 determines the input connection error connection sub-module 213 determines the phase error correction module 22 and module 25 is connected to the inverting error correction.
Wherein: amplitude measurement submodule 212 is used to detect the amplitude of three-phase current and voltage;
Measurement of angle submodule 211 is used to measure the angle of three-phase current and voltage;
Error connection line judges that submodule 213 is used for forming polar plot according to the amplitude and the angle of three-phase current and voltage; Judge whether to take place wiring error according to this polar plot, and this wiring error result is sent to misphase correction module 22 and/or reverse correction module 25 is carried out correction process.
Optional, the concrete structure of misphase correction module 22 is as shown in Figure 4, comprising: A voltage MUX 221, B voltage MUX 222, C voltage MUX 223 and U channel selecting module 224;
Wherein, The input end of A voltage MUX 221, B voltage MUX 222 and C voltage MUX 223 links to each other with A phase voltage
B phase voltage
C phase voltage
respectively; The selecting side of A voltage MUX 221, B voltage MUX 222 and C voltage MUX 223 is connected with U channel selecting module 224; U channel selecting module 224; Be used to receive the wiring error result of false wiring detection module 21; And produce the selection signal, and should select signal to send to A voltage MUX 221, B voltage MUX 222 and C voltage MUX 223 according to this wiring error result; A voltage MUX 221, B voltage MUX 222 and C voltage MUX 223 are exported A phase voltage, B phase voltage and the C phase voltage after the error correction respectively;
This misphase correction module 22 can also comprise:: A current multi-way selector switch 225, B current multi-way selector switch 226, C current multi-way selector switch 227 and I channel selecting module 228;
Wherein, The input end of A current multi-way selector switch 225, B current multi-way selector switch 225 and C current multi-way selector switch 227 links to each other with A phase current
B phase current
C phase current
respectively; The selecting side of A current multi-way selector switch 225, B current multi-way selector switch 226 and C current multi-way selector switch 227 is connected with I channel selecting module 228; I channel selecting module 228; Be used to receive the wiring error result of false wiring detection module 21; And produce the selection signal, and should select signal to send to said A current multi-way selector switch 225, B current multi-way selector switch 226 and said C current multi-way selector switch 227 according to this wiring error result; A current multi-way selector switch 225, B current multi-way selector switch 226 and C current multi-way selector switch 227 are selected A phase current, B phase current and C phase current after signal is exported error correction according to this;
Wherein, U channel selecting module 224 and I channel selecting module 228 all with false wiring detection module 21 in error connection line judge that submodule 213 is connected.
Optional, the concrete structure of above-mentioned anti-phase correction module 25 is as shown in Figure 5, comprising: the first reverse submodule 251, the first chooser module 252 and active power symbol are selected module 253;
Wherein the input end of the first chooser module 252 is connected with the output terminal that the function power take-off and the first reverse submodule 251 are arranged of power measurement module 23 respectively, and first reverse submodule 251 input ends are connected with the function power take-off that has of power measurement module 23;
The active power symbol selects module 253 to be connected with the selecting side of the first chooser module 252, and the output terminal of the first chooser module 252 is connected with electric energy metrical module 24; The active power symbol selects module 253 to be connected with false wiring detection module 21, and produces symbol selection signal according to the wiring error result of this false wiring detection module 21, and selects signal to send to the selecting side of the first chooser module 252 this symbol;
Wherein the input end of the second chooser module 255 is connected with the no function power take-off of power measurement module 23 and the output terminal of the second reverse submodule 254 respectively, and second reverse submodule 254 input ends are connected with the no function power take-off of power measurement module 23;
The reactive power symbol selects module 256 to be connected with the selecting side of the second chooser module 255, and the output terminal of the second chooser module 255 is connected with electric energy metrical module 24; The reactive power symbol selects module 256 to be connected with false wiring detection module 21, and produces symbol selection signal according to the wiring error result of this false wiring detection module 21, and selects signal to send to the selecting side of the second chooser module 255 this symbol.
Through principle of work of the present invention technique effect of the present invention is described below, when artificial Miswire, electric energy computation chip of the present invention is detected the mistake of line by the false wiring detection module; For example; Testing result is misphase Miswire (for example A receives the B phase mutually, and B receives C mutually and equates), then the misphase testing result is sent to the misphase correction module; The misphase correction module sends to power computation module after carrying out the misphase error correction according to this testing result; Like testing result is anti-phase connection error (for example the A phase current is reverse, the B phase current is reverse etc.); Then the inverse detection result is sent to after the anti-phase correction module carries out error correction; Send to the electric energy metrical module and carry out electric energy calculating; No matter connect or reverse line all can carry out correction process, so no matter how wiring of this electric energy computation chip user all can be carried out work by correct line because electric energy computation chip provided by the invention is a misphase; So this electric energy computation chip has the electric energy meter of making reliably working, electric quantity metering is advantage accurately.
The present invention also provides a kind of three-phase and four-line electric energy meter, and the structure of this electric energy meter is as shown in Figure 6, and this electric energy meter comprises: above-mentioned electric energy computation chip; The concrete structure of this electric energy computation chip can not given unnecessary details referring to above-mentioned explanation here, and this electric energy meter also comprises: microprocessor MCU, display module, communication module, memory module and real-time clock RTC;
Wherein, electric energy computation chip, display module, communication module, memory module and RTC all are connected with MCU.
Three-phase and four-line electric energy meter provided by the invention is when artificial Miswire; Electric energy computation chip in the electric energy meter of the present invention detects the mistake of line by the false wiring detection module, and for example, testing result is that (for example A receives the B phase to the misphase Miswire mutually; B receives C mutually and equates); Then the misphase testing result is sent to the misphase correction module, the misphase correction module sends to power computation module after carrying out the misphase error correction according to this testing result; Like testing result is anti-phase connection error (for example the A phase current is reverse, the B phase current is reverse etc.); Then the inverse detection result is sent to after the anti-phase correction module carries out error correction; Send to the electric energy metrical module and carry out electric energy calculating; No matter connect or reverse line all can carry out correction process, so no matter how wiring of this electric energy computation chip user all can be carried out work by correct line because electric energy computation chip provided by the invention is a misphase; So this electric energy computation chip has the electric energy meter of making reliably working, electric quantity metering is advantage accurately.
It is high that technical scheme provided by the invention has the electric energy meter functional reliability, and electric quantity metering is advantage accurately.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. an electric energy computation chip is characterized in that, said electric energy computation chip comprises:
False wiring detection module, misphase correction module, power measurement module, electric energy metrical module;
Wherein, The input end of said false wiring detection module and said misphase correction module is connected with A phase current
B phase current
C phase current
A phase voltage
B phase voltage
C phase voltage
respectively, and the output terminal of said false wiring detection module is connected Yu said misphase correction module; The output terminal of said misphase correction module is connected with said power measurement module; Said false wiring detection module is used to detect three-phase current and whether three-phase voltage wiring error takes place, and this wiring error result is sent to said misphase correction module carries out correction process;
The output terminal of said power measurement module is connected with the input end of electric energy metrical module.
2. electric energy computation chip according to claim 1 is characterized in that, said electric energy computation chip also comprises:
The anti-phase correction module;
Wherein, The input end of said anti-phase correction module is connected with the output terminal of said false wiring detection module; The input end of said anti-phase correction module also is connected with the reactive power output terminal with the active power output terminal of said power measurement module, and the output terminal of said anti-phase correction module is connected with the input end of said electric energy metrical module;
Said anti-phase correction module is used for when three-phase current generation current reversal, corrects negative-phase sequence curent.
3. electric energy computation chip according to claim 1 is characterized in that, said false wiring detection module specifically comprises:
Measurement of angle submodule, amplitude measurement submodule and error connection line are judged submodule;
Wherein, the input end of said measurement of angle submodule and said amplitude measurement submodule is connected with A phase current
B phase current
C phase current
A phase voltage
B phase voltage
C phase voltage
respectively; The output terminal of said measurement of angle submodule and said amplitude measurement submodule judges that with said error connection line the input end of submodule is connected, and said error connection line judges that submodule is connected with said misphase correction module;
Said amplitude measurement submodule is used to detect the amplitude of three-phase current and voltage;
Said measurement of angle submodule is used to measure the angle of three-phase current and voltage;
Said error connection line judges that submodule is used for amplitude and the angle composition polar plot according to three-phase current and voltage, judges whether to take place wiring error according to this polar plot, and this wiring error result is sent to said misphase correction module carries out correction process.
4. electric energy computation chip according to claim 2 is characterized in that, said false wiring detection module specifically comprises:
Measurement of angle submodule, amplitude measurement submodule and error connection line are judged submodule;
Wherein, the input end of said measurement of angle submodule and said amplitude measurement submodule is connected with A phase current
B phase current
C phase current
A phase voltage
B phase voltage
C phase voltage
respectively; The output terminal of said measurement of angle submodule and said amplitude measurement submodule judges that with said error connection line the input end of submodule is connected, and said error connection line judges that submodule is connected with said anti-phase correction module with said misphase correction module;
Said amplitude measurement submodule is used to detect the amplitude of three-phase current and voltage;
Said measurement of angle submodule is used to measure the angle of three-phase current and voltage;
Said error connection line judges that submodule is used for forming polar plot according to the amplitude and the angle of three-phase current and voltage; Judge whether to take place wiring error according to this polar plot, and this wiring error result is sent to said misphase correction module and said reverse correction module is carried out correction process.
5. electric energy computation chip according to claim 1 is characterized in that, said misphase correction module comprises: A voltage MUX, B voltage MUX, C voltage MUX and U channel selecting module;
Wherein, The input end of said A voltage MUX, said B voltage MUX and said C voltage MUX links to each other with A phase voltage
B phase voltage
C phase voltage
respectively; The selecting side of said A voltage MUX, said B voltage MUX and said C voltage MUX is connected with said U channel selecting module; Said U channel selecting module; Be used to receive the wiring error result of said false wiring detection module; And produce the selection signal, and should select signal to send to said A voltage MUX, said B voltage MUX and said C voltage MUX according to this wiring error result; Said A voltage MUX, said B voltage MUX and said C voltage MUX are selected A phase voltage, B phase voltage and C phase voltage after signal is selected the output error correction according to this;
This misphase correction module also comprises: A current multi-way selector switch, B current multi-way selector switch, C current multi-way selector switch and I channel selecting module;
Wherein, The input end of said A current multi-way selector switch, said B current multi-way selector switch and said C current multi-way selector switch links to each other with A phase current
B phase current
C phase current
respectively; The selecting side of said A current multi-way selector switch, said B current multi-way selector switch and said C current multi-way selector switch is connected with said I channel selecting module; Said I channel selecting module; Be used to receive the wiring error result of said false wiring detection module; And produce the selection signal, and should select signal to send to said A current multi-way selector switch, said B current multi-way selector switch and said C current multi-way selector switch according to this wiring error result; Said A current multi-way selector switch, said B current multi-way selector switch and said C current multi-way selector switch are selected A phase current, B phase current and C phase current after signal is exported error correction according to this;
Wherein, said U channel selecting module and said I channel selecting module all are connected with said false wiring detection module.
6. electric energy computation chip according to claim 2 is characterized in that,
Said anti-phase correction module comprises: the first reverse submodule, the first chooser module and active power symbol are selected module;
Wherein, The input end of the said first chooser module has the output terminal of the function power take-off and the said first reverse submodule to be connected with the said of said power measurement module respectively, and the said first reverse submodule input end is connected with the function power take-off that has of said power measurement module;
Said active power symbol selects module to be connected with the selecting side of the said first chooser module, and the output terminal of the said first chooser module is connected with said electric energy metrical module; Said active power symbol selects module to be connected with said false wiring detection module, and produces symbol selection signal according to the wiring error result of this false wiring detection module, and selects signal to send to the said first chooser module this symbol;
Said anti-phase correction module also comprises: the second reverse submodule, the second chooser module and reactive power symbol are selected module;
Wherein, The input end of the said second chooser module is connected with the no function power take-off of said power measurement module and the output terminal of the said second reverse submodule respectively, and the said second reverse submodule input end is connected with the no function power take-off of said power measurement module;
Said reactive power symbol selects module to be connected with the selecting side of the said second chooser module, and the output terminal of the said second chooser module is connected with the electric energy metrical module; Said reactive power symbol selects module to be connected with said false wiring detection module, and produces symbol selection signal according to the wiring error result of this false wiring detection module, and selects signal to send to the said second chooser module this symbol.
7. three-phase and four-line electric energy meter,, comprise microprocessor MCU, display module, communication module, memory module and real-time clock RTC, it is characterized in that said electric energy meter comprises arbitrary described electric energy computation chip like claim 1-6;
Wherein, said electric energy computation chip, said display module, said communication module, said memory module and said real-time clock RTC all are connected with said MCU.
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|---|---|---|---|
| CN201110073452.9A CN102692535B (en) | 2011-03-25 | 2011-03-25 | Electric energy metering chip and three-phase four-wire electric energy meter |
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| CN201110073452.9A CN102692535B (en) | 2011-03-25 | 2011-03-25 | Electric energy metering chip and three-phase four-wire electric energy meter |
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Cited By (7)
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| CN102253359A (en) * | 2011-04-28 | 2011-11-23 | 深圳市锐能微科技有限公司 | Method and system for correcting false wiring of three-phase four-wire watt-hour meter and watt-hour meter |
| CN103293353A (en) * | 2012-12-28 | 2013-09-11 | 铨盛电子股份有限公司 | Intelligent type multifunctional digital electric meter and application judging method thereof |
| CN104991151A (en) * | 2015-06-24 | 2015-10-21 | 国家电网公司 | Method and device for analyzing wrong wiring of three-phase four-wire electric energy metering device |
| CN110488138A (en) * | 2019-09-06 | 2019-11-22 | 中润油联天下网络科技有限公司 | A method of it is automatic quickly to determine equipment line sequence and data protocol |
| CN111244891A (en) * | 2020-01-17 | 2020-06-05 | 四川万益能源科技有限公司 | Instrument self-checking wiring system and method suitable for reactive compensation power distribution room |
| CN111983521A (en) * | 2020-06-05 | 2020-11-24 | 安徽南瑞中天电力电子有限公司 | Electric energy meter with functions of automatic identification of wrong wiring and correct metering and method thereof |
| CN112269055A (en) * | 2020-11-25 | 2021-01-26 | 程昱舒 | Intelligent junction box for electric energy metering |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253359A (en) * | 2011-04-28 | 2011-11-23 | 深圳市锐能微科技有限公司 | Method and system for correcting false wiring of three-phase four-wire watt-hour meter and watt-hour meter |
| CN103293353A (en) * | 2012-12-28 | 2013-09-11 | 铨盛电子股份有限公司 | Intelligent type multifunctional digital electric meter and application judging method thereof |
| CN104991151A (en) * | 2015-06-24 | 2015-10-21 | 国家电网公司 | Method and device for analyzing wrong wiring of three-phase four-wire electric energy metering device |
| CN110488138A (en) * | 2019-09-06 | 2019-11-22 | 中润油联天下网络科技有限公司 | A method of it is automatic quickly to determine equipment line sequence and data protocol |
| CN111244891A (en) * | 2020-01-17 | 2020-06-05 | 四川万益能源科技有限公司 | Instrument self-checking wiring system and method suitable for reactive compensation power distribution room |
| CN111983521A (en) * | 2020-06-05 | 2020-11-24 | 安徽南瑞中天电力电子有限公司 | Electric energy meter with functions of automatic identification of wrong wiring and correct metering and method thereof |
| CN112269055A (en) * | 2020-11-25 | 2021-01-26 | 程昱舒 | Intelligent junction box for electric energy metering |
| CN112269055B (en) * | 2020-11-25 | 2024-03-19 | 程昱舒 | Intelligent junction box for electric energy metering |
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| CN102692535B (en) | 2014-11-26 |
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