CN2578837Y - Three-phase kilowatt meter - Google Patents
Three-phase kilowatt meter Download PDFInfo
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- CN2578837Y CN2578837Y CN 02263996 CN02263996U CN2578837Y CN 2578837 Y CN2578837 Y CN 2578837Y CN 02263996 CN02263996 CN 02263996 CN 02263996 U CN02263996 U CN 02263996U CN 2578837 Y CN2578837 Y CN 2578837Y
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Abstract
The utility model discloses a three phase electric energy meter. The utility model is characterized in that a current divider is used as a sampling component for electric currents, and three completely independent data acquisition modules are adopted in order to solve the isolating problem among three phases. The utility model has the advantages of low cost, no magnetic saturation phenomena, external alternating current and direct current magnetic field resistance, and accurate measurement.
Description
One, technical field:
The utility model relates to a kind of three-phase electric energy meter, is used for electric energy metrical.
Two, background technology:
In the existing three-phase electric energy meter, all adopt mutual inductor (CT) as the current sampling parts, current signal and the voltage signal got multiply each other, and obtain electric energy (seeing accompanying drawing 1).There is following shortcoming in this electric energy meter: 1, when direct current passes through mutual inductor, can cause the magnetic saturation of mutual inductor, can cause seriously losing of metering electric energy simultaneously.2, when ammeter is applied straight external magnetic field, also can cause the magnetic saturation of mutual inductor.When magnetic field intensity reached 5000 ampere-turns, error in dipping was at 40%-90%.3, mutual inductor cost height accounts for 1/4 of common three-phase telogenesis basis greatly, becomes the bottleneck that three-phase electric energy meter reduces cost.
Three, summary of the invention:
Technical problem to be solved in the utility model is to provide a kind of three-phase electric energy meter, adopts the shunt current sampling, and the existing three-phase electric energy meter of its cost reduces greatly, no magnetic saturation, anti-outside AC magnetic field and D.C. magnetic field, and accurate measurement.
The utility model three-phase electric energy meter, its major technology characteristics are to replace the mutual inductor of original electric energy meter as the sampled part of electric current with shunt.It mainly by three single-phase current sampled parts (shunt), three single-phase voltage sampled parts, three single-phase electric energy computation chips, six photoelectricity isolated parts (optocoupler), gather the resitstance voltage divider and the amplifier of each phase voltage phase place and amplitude, and CPU, storer, display (LCD), communication interface, button form.The current phase signal output interface of the shunt of each phase links to each other with CPU by the photoelectricity isolated part, the voltage signal output interface of the current signal output interface of the shunt of each phase and the voltage sampling parts of each phase links to each other with electric energy computation chip, and the electric power signal output interface of electric energy computation chip links to each other with CPU by photoelectricity isolated part (optocoupler).The amplitude signal of the voltage of resitstance voltage divider and amplifier, the output interface of phase signal link to each other with EPLD, CPU.CPU connected storage, display, communication interface, button.
The utility model three-phase electric energy meter is owing to adopt shunt as the current sampling parts, and cost reduces greatly, no magnetic saturation phenomenon, anti-outside AC and DC magnetic field, accurate measurement.
Four, description of drawings:
Fig. 1 is the electric energy meter functional-block diagram of prior art;
Fig. 2 is the utility model three-phase electric energy meter functional-block diagram;
Fig. 3 is the utility model three-phase electric energy meter circuit diagram (synthetic by Fig. 3-1 and Fig. 3-2);
Fig. 4 is the circuit diagram of the utility model three-phase electric energy meter power unit.
Five, embodiment
Below in conjunction with accompanying drawing the utility model three-phase electric energy meter is described in further detail.
The utility model three-phase electric energy meter adopts shunt as the current sampling parts.For solving the isolating problem between the three-phase, this programme adopts three fully independently data acquisition modules, and therefore, what this three-phase electric energy meter used is the single-phase electric energy computation chip.It mainly by three single-phase current sampled parts (shunt), three single-phase voltage sampled parts, three single-phase electric energy computation chips, six photoelectricity isolated parts (optocoupler), gather the resitstance voltage divider and the amplifier of each phase voltage phase place and amplitude, and CPU, storer, display (LCD), communication interface, button form.The current phase signal output interface of the shunt of each phase links to each other with CPU by the photoelectricity isolated part, the voltage signal output interface of the current signal output interface of the shunt of each phase and the voltage sampling parts of each phase links to each other with electric energy computation chip, and the electric power signal output interface of electric energy computation chip links to each other with CPU by photoelectricity isolated part (optocoupler).The voltage phase signal of resitstance voltage divider and amplifier links to each other with EPLD, CPU with the output interface of amplitude signal.CPU connected storage, display, communication interface, button.
The principle of work of the utility model three-phase electric energy meter is as follows: (is example mutually with A)
1, the collection of electric power signal
Solve the isolation between the three-phase and adopt three fully independently acquisition modules.Adopt the single-phase electric energy computation chip.The electric energy of its metering is exported to the unified processing of CPU through optocoupler.Concrete grammar is: the voltage of A phase by resistance by 1R1,1R2 ... until 1R22 is connected to signal ground (AGND).The signal of voltage is taken from the resistance 1R22, delivers to the 7th pin of electric energy computation chip AD7755, and current signal is from delivering to 5 pin and 6 pin of AD7755 after shunt is got.Power supply for the work of A phase electric energy chip is made of R4, U6, U8, C15, C5, U12, C18, C11.Again the periphery of AD7755 is added some himself required resolution element, AD7755 just can export electrical energy pulse, electrical energy pulse outputs to U8 (optocoupler) by 22 pin of AD7755, the opposite side of optocoupler is given CPU electric power signal, after the reverse signal of voltage and current is come out by the AD7755 chip detection, deliver to CPU by optocoupler U12, U13, U14, in order to calculate various electric energy.
2, the collection of voltage signal
The collection of voltage magnitude is that the A phase voltage is guided to socket 4X6, form emitter follower by V1, D1 and 4R7 after the dividing potential drop through 4R11,4R22,4R13, and be the network label sampling end that the signal of Ra2 is delivered to TLC2543, by TLC2543 simulating signal is converted into digital signal and uses for CPU.
The sample circuit of voltage-phase is made of LM324,4R9,4R10.When the network label was the signal zero crossing at LA place, the network label was that the level at NET7 place will overturn, and gave CPU after this signal is calculated by 3U3 (EPLD) and handled.
3, current signals
The phase place of electric current is detected by 1C17,1R36,1R37, LM324,1R38,1R39,1R40,1R41,1R42, U5, the symbol of difference of voltage signal that when the network label is ad1 and ad2 place is by just becoming negative or becoming timing by negative, and the network label is that the voltage at NET6 place will overturn.During upset, EPLD will detect, and it is delivered to CPU, and the high or low sense of current of having represented of the voltage at NET6 place.
B phase, C phase signals acquisition method are mutually identical with A.
Because signal, the phase place of voltage have been arranged, the direction of the phase place of electric current and electric energy, voltage and current and time, CPU can calculate active energy, reactive energy, active power, the reactive power of current amplitude, all quadrants, the maximum demand of unit interval, the various service datas of electrical networks such as maximum demand time of origin, minimum requirement time of origin, and then can store, show, transmit above data.
Claims (1)
1, a kind of three-phase electric energy meter, it is characterized in that: by three shunts respectively as three single-phase current sampled parts, also comprise three single-phase voltage sampled parts simultaneously, three single-phase electric energy computation chips, six optocouplers, gather the resitstance voltage divider and the amplifier of each phase voltage phase place and amplitude, and EPLD, CPU, storer, display, communication interface, button is formed, the current phase signal output interface of the shunt of each phase links to each other with CPU by the photoelectricity isolated part, the voltage signal output interface of the current signal output interface of the shunt of each phase and the voltage sampling parts of each phase links to each other with electric energy computation chip, the electric power signal output interface of electric energy computation chip links to each other with CPU by photoelectricity isolated part (optocoupler), the voltage phase signal of resitstance voltage divider and amplifier, the output interface of amplitude signal and EPLD, CPU links to each other, the CPU connected storage, display, communication interface, button.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02263996 CN2578837Y (en) | 2002-08-28 | 2002-08-28 | Three-phase kilowatt meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02263996 CN2578837Y (en) | 2002-08-28 | 2002-08-28 | Three-phase kilowatt meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2578837Y true CN2578837Y (en) | 2003-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02263996 Expired - Fee Related CN2578837Y (en) | 2002-08-28 | 2002-08-28 | Three-phase kilowatt meter |
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| CN (1) | CN2578837Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101464501B (en) * | 2007-12-20 | 2011-12-14 | 上海联能仪表有限公司 | Calibrating apparatus for electric energy quality test analyzer |
| CN102495279A (en) * | 2011-12-23 | 2012-06-13 | 无锡博欧电子科技有限公司 | Metering device for multipath alternating current electric quantities |
| CN102648418A (en) * | 2009-05-11 | 2012-08-22 | 兰吉尔私人有限公司 | Meter and communications apparatus |
| CN103018510A (en) * | 2012-07-10 | 2013-04-03 | 郭建国 | Isolated serial peripheral interface (SPI) bus electric energy measuring module and APLC electricity meter |
| CN103823108A (en) * | 2012-11-19 | 2014-05-28 | 苏州工业园区新宏博通讯科技有限公司 | Multipath AC-DC ammeter |
| CN103852635A (en) * | 2012-12-06 | 2014-06-11 | 苏州工业园区新宏博通讯科技有限公司 | Multi-path electric meter |
| CN105807130A (en) * | 2014-12-29 | 2016-07-27 | 施耐德电气工业公司 | Multi-phase electric meter and implementation method thereof |
| CN105807105A (en) * | 2014-12-29 | 2016-07-27 | 施耐德电气工业公司 | Electric power metering device and method thereof |
| CN107621561A (en) * | 2017-09-07 | 2018-01-23 | 宁波三星医疗电气股份有限公司 | A kind of antimagnetic electric energy meter of current sample power frequency |
-
2002
- 2002-08-28 CN CN 02263996 patent/CN2578837Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101464501B (en) * | 2007-12-20 | 2011-12-14 | 上海联能仪表有限公司 | Calibrating apparatus for electric energy quality test analyzer |
| CN102648418A (en) * | 2009-05-11 | 2012-08-22 | 兰吉尔私人有限公司 | Meter and communications apparatus |
| CN102495279A (en) * | 2011-12-23 | 2012-06-13 | 无锡博欧电子科技有限公司 | Metering device for multipath alternating current electric quantities |
| CN103018510A (en) * | 2012-07-10 | 2013-04-03 | 郭建国 | Isolated serial peripheral interface (SPI) bus electric energy measuring module and APLC electricity meter |
| CN103018510B (en) * | 2012-07-10 | 2015-11-18 | 郭建国 | Isolation spi bus electric energy metering module and APLC ammeter thereof |
| CN103823108A (en) * | 2012-11-19 | 2014-05-28 | 苏州工业园区新宏博通讯科技有限公司 | Multipath AC-DC ammeter |
| CN103852635A (en) * | 2012-12-06 | 2014-06-11 | 苏州工业园区新宏博通讯科技有限公司 | Multi-path electric meter |
| CN105807130A (en) * | 2014-12-29 | 2016-07-27 | 施耐德电气工业公司 | Multi-phase electric meter and implementation method thereof |
| CN105807105A (en) * | 2014-12-29 | 2016-07-27 | 施耐德电气工业公司 | Electric power metering device and method thereof |
| CN107621561A (en) * | 2017-09-07 | 2018-01-23 | 宁波三星医疗电气股份有限公司 | A kind of antimagnetic electric energy meter of current sample power frequency |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |