CN201043982Y - Three-phase three-wire, three-phase four-wire compatibility electric energy meter - Google Patents

Three-phase three-wire, three-phase four-wire compatibility electric energy meter Download PDF

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Publication number
CN201043982Y
CN201043982Y CNU2007200798619U CN200720079861U CN201043982Y CN 201043982 Y CN201043982 Y CN 201043982Y CN U2007200798619 U CNU2007200798619 U CN U2007200798619U CN 200720079861 U CN200720079861 U CN 200720079861U CN 201043982 Y CN201043982 Y CN 201043982Y
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CN
China
Prior art keywords
phase
wire
electric energy
circuit
energy meter
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Application number
CNU2007200798619U
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Chinese (zh)
Inventor
林柏
冯德智
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四川启明星蜀达电气有限公司
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Priority to CNU2007200798619U priority Critical patent/CN201043982Y/en
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Publication of CN201043982Y publication Critical patent/CN201043982Y/en

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Abstract

This utility model a three-phase three-wire and three-phase four-wire compatible electric energy meter comprises external terminal A, B, C, N and a microprocessor which is connected with serial interface, and a display circuit, a storage circuit, a clock circuit and a power circuit supplying power to all energy tables respectively, which is connected with microprocessor. The utility model is characterized in that it is a high accuracy chip IC counting circuit can treat the input three-phase voltage signal UA, UB, UC, UN and current signal IA, IB and IC. This utility model can be used not only as three-phase three-wire system electric energy meter, but also a three-phase four-wire system, which is convenient for purchase, storage and use of customer and production, storage and management of manufacturer.

Description

Phase three-wire three, three-phase and four-line Campatible electric energy meter
Technical field:
The utility model is relevant with electric energy meter, and is especially relevant with phase three-wire three, three-phase and four-line Campatible electric energy meter.
Background technology:
The domestic three-phase electric energy meter of in the past producing is divided into two types of three-phase three-wire system and three-phase four-wire systems.The metering method of this electric energy meter of two types, the mode of connection, electric pressure are all inequality, so these two kinds of electric energy meters are to design respectively, produce and use.Its weak point is that two types electric energy meter can not be compatible, in use must buy respectively, takes care of respectively, take respectively, for application brings inconvenience.
The utility model content:
The purpose of this utility model is in order to overcome above deficiency, provide a kind of and can be used as three-phase three-wire system, also can be as the electric energy meter of three-phase four-wire system, can be the user buy, keeping and taking brings convenience, and also made things convenient for electric energy meter manufacturer's the production and phase three-wire three, the three-phase and four-line Campatible electric energy meter of storage management.
The purpose of this utility model is achieved like this:
Phase three-wire three, three-phase and four-line Campatible electric energy meter in the utility model, comprise external cabling terminal A, B, C, N, with the serial ports microprocessor linked, the display circuit that is connected with microprocessor, memory circuit, clock circuit respectively, provide the power circuit of power supply to the circuit of whole electric energy, it is characterized in that having the band that is connected with microprocessor by the SPI data bus by the three-phase voltage signal U of connection terminal with input A, U B, U C, U NWith current signal I A, I B, I CThe high-precision measuring chip IC of handling 1Metering circuit, microprocessor is the core devices of control section, its main effect is the operation of finishing the electric energy meter Control Software, and carries out communication and exchanges data with external unit and other device.Memory circuit is the place of the storage of computational data, display circuit is the interface that is used to show the man-machine interaction of various data, clock circuit is that ammeter is finished the time source that the multiple rate of electric weight is calculated, and the effect of high-precision measuring chip is a three-phase voltage signal that will input and current signal is handled and calculate result's (as meritorious electric energy, reactive energy, voltage effective value, current effective value, active power, reactive power etc.) according to the computing formula (two kinds of three-phase three-wire system and three-phase four-wire systems) of appointment.
By current transformer and dividing potential drop input circuit three-phase current signal and voltage signal are imported the high-precision measuring chip IC in the above-mentioned metering circuit 11 pin, 2 pin, 3 pin, 4 pin, 5 pin, 6 pin.
Above-mentioned high-precision measuring chip IC 1Adopting model is ATT7026A or ATT7022A.
Have in the above-mentioned power circuit respectively by diode D 1, D 2, D 3The switch power module IC that is connected with the three-phase voltage input end 3
Above-mentioned switch power module IC 3Adopting model is the module of PH4D-5.705T, BejingPower ﹠amp; Heart Electronic Co., Ltd production is input as 60-650V DC, is output as the module of 5.7V/0.5A DC.
There is the range of nominal tension that is connected with the three-phase voltage input end respectively to reach the wide region transformer T of 57.7~260V in the above-mentioned power circuit 1, T 2, T 3The diode D that one end is connected with wide region transformer secondary output end respectively 4, D 5, D 6The other end be connected to high voltage conversion chip IC 2On.
Above-mentioned high voltage conversion chip IC 2Adopting model is LM5574 or LM5010.
When three-phase electric energy meter was realized metering, two types electric energy meter had certain difference, mainly contains following 3 points:
1, metering method
Three-phase three-wire system uses the two elements method P = V · AB · I · A + V · CB · I · C ,
Three-phase four-wire system uses the three element method P = V · A · I · A + V · B · I · B + V · C · I · C
2, the mode of connection
Three-phase three-wire system adopts the delta connection mode
Three-phase four-wire system adopts the Y connection mode
3, electric pressure
The three-phase three-wire system electric pressure is 3X100V
The three-phase four-wire system electric pressure is 3X57.7V, 3X220V
Need the solution of three aspect problems so electric energy meter is realized the conversion of three-phase three-wire system and three-phase four-wire system: the conversion of electric weight computing method, the conversion of input signal, power circuit wide region adapt to.
The conversion of the utility model electric weight computing method:
Electric energy meter is after connecting alternating current, the microprocessor of electric energy meter is known the electric energy meter type command (the type setting command that refers to three-phase three-wire system or three-phase four-wire system) that the user sets by serial communication, and computation chip is set by spi bus, computation chip is handled the three-phase voltage signal and the current signal of input according to the ammeter type of setting, then result of calculation is transferred to microprocessor and calculates electric quantity data, the time that the while microprocessor reads clock chip, to calculate electric quantity data according to the time and deposit the multiple rate electric weight of formation respectively in storage chip, end user can pass through the display interface reading of data of display circuit or pass through the serial ports reading of data of electric energy meter.
The conversion of the utility model input signal:
When being used as the three-phase and four-line tabulation, adopt the Y connection mode, be about to the direct and external input voltage U of external cabling terminal A, B, C, N of ammeter A, U B, U C, VN connects, at this moment the voltage reference points of internal circuit is VN, A, B, C point are exactly phase voltage U with respect to the current potential of voltage reference points so A, U B, U C, and the electric current of importing by A, B, C point is I A, I B, I CWhen being used as the phase three-wire three tabulation, adopt the delta connection mode, be about to external cabling terminal A, B, C and the external input voltage U of ammeter A, U B, U CConnect, simultaneously terminal B is connected with VN, at this moment the voltage reference points of internal circuit is U B, A, C point is exactly the line voltage U with respect to the current potential of voltage reference points so AB, U CB, and pass through electric current or the I that A, C point is imported A, I CSo just realized the conversion of input signal on two elements method (being used as the phase three-wire three tabulation) and three element method (being used as the three-phase and four-line tabulation).
The utility model power circuit wide region adapts to: the power unit circuit can be to use switch power module to provide electric energy meter required VCC power supply, also can use the circuit that is to use wide region transformer and DC-DC conversion chip to form to provide electric energy meter required VCC power supply, the effect of high voltage DC-DC conversion chip is that transformer secondary output output and the wide-range direct current voltage after rectification are converted to the needed 5.7V burning voltage of meter circuit with the power supply as meter circuit.Use switch power module or input voltage range wide region transformer and interlock circuit thereof in a word, to satisfy three-phase three-wire system and the different requirements of three-phase four-wire system to electric pressure as 57.7V~260V AC.
1) user can be used as same class table statistics and purchase with three-phase three-wire system and three-phase and four-line tabulation when buying electric energy meter, and price is the same, is convenient to handle.
2) user must not distinguish three-phase three-wire system ammeter and three-phase four-wire system ammeter in stock control, convenient management.
3) user must not distinguish three-phase three-wire system ammeter and three-phase four-wire system ammeter yet when getting use, the convenient use.
4) manufacturer must not distinguish three-phase three-wire system ammeter and three-phase four-wire system ammeter yet when producing, convenient production and storage management.
Description of drawings:
Fig. 1 is the utility model circuit theory diagrams.
Fig. 2 is power circuit principle figure.
Fig. 3 is another schematic diagram of power circuit.
Embodiment:
Referring to Fig. 1, the utility model phase three-wire three, three-phase and four-line Campatible electric energy meter, comprise external cabling terminal A, B, C, N, with serial ports 1 microprocessor linked 2, the display circuit 3 that is connected with microprocessor respectively, memory circuit 4, clock circuit 5, provide the power circuit 6 of power supply to the circuit of whole electric energy, the band that is connected with microprocessor by the SPI data bus is by the three-phase voltage signal U of connection terminal with input A, U B, U C, U NWith current signal I A, I B, I CThe model of handling is the high-precision measuring chip IC of ATT7026A or ATT7022A 1Metering circuit.By current transformer and dividing potential drop input circuit three-phase current signal and voltage signal are imported 1 pin, 2 pin, 3 pin, 4 pin, 5 pin, 6 pin of high-precision measuring chip in the metering circuit.
Power circuit can adopt the described structure of Fig. 2.Referring to Fig. 2, have in the power circuit respectively by diode D 1, D 2, D 3The model that is connected with the three-phase voltage input end is the switch power module IC of PH4D-5.705T 3
Power circuit also can adopt structure shown in Figure 3.Referring to Fig. 3, there is the range of nominal tension that is connected with the three-phase voltage input end respectively to reach the wide region transformer T of 57.7~260V in the power circuit 1, T 2, T 3.The diode D that one end is connected with wide region transformer secondary output end respectively 4, D 5, D 6The other end be connected to the high voltage conversion chip IC that model is LM5574 or LM5010 2On.

Claims (7)

1. phase three-wire three, three-phase and four-line Campatible electric energy meter, comprise external cabling terminal A, B, C, N, with the serial ports microprocessor linked, the display circuit that is connected with microprocessor, memory circuit, clock circuit respectively, provide the power circuit of power supply to the circuit of whole electric energy, it is characterized in that having the band that is connected with microprocessor by the SPI data bus by the three-phase voltage signal U of connection terminal with input A, U B, U C, U and current signal I A, I B, I CThe high-precision measuring chip IC of handling 1Metering circuit.
2. phase three-wire three as claimed in claim 1, three-phase and four-line Campatible electric energy meter is characterized in that by current transformer and dividing potential drop input circuit three-phase current signal and voltage signal being imported the high-precision measuring chip IC in the metering circuit 11 pin, 2 pin, 3 pin, 4 pin, 5 pin, 6 pin.
3. phase three-wire three as claimed in claim 1 or 2, three-phase and four-line Campatible electric energy meter is characterized in that the high-precision measuring chip IC 1Adopting model is ATT7026A or ATT7022A.
4. phase three-wire three as claimed in claim 1 or 2, three-phase and four-line Campatible electric energy meter is characterized in that having in the power circuit respectively by diode D 1, D 2, D 3The switch power module IC that is connected with the three-phase voltage input end 3
5. phase three-wire three as claimed in claim 4, three-phase and four-line Campatible electric energy meter is characterized in that switch power module IC 3Adopting model is the module of PH4D-5.705T.
6. phase three-wire three as claimed in claim 1 or 2, three-phase and four-line Campatible electric energy meter is characterized in that having in the power circuit range of nominal tension that is connected with the three-phase voltage input end respectively to reach the wide region transformer T of 57.7~260V 1, T 2, T 3, the diode D that an end is connected with wide region transformer secondary output end respectively 4, D 5, D 6The other end be connected to IC on the high voltage conversion chip 2
7. phase three-wire three as claimed in claim 6, three-phase and four-line Campatible electric energy meter is characterized in that high voltage conversion chip IC 2Adopting model is LM5574 or LM5010.
CNU2007200798619U 2007-06-11 2007-06-11 Three-phase three-wire, three-phase four-wire compatibility electric energy meter CN201043982Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2007200798619U CN201043982Y (en) 2007-06-11 2007-06-11 Three-phase three-wire, three-phase four-wire compatibility electric energy meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2007200798619U CN201043982Y (en) 2007-06-11 2007-06-11 Three-phase three-wire, three-phase four-wire compatibility electric energy meter

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CN201043982Y true CN201043982Y (en) 2008-04-02

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101819223A (en) * 2010-03-02 2010-09-01 南京亚派科技实业有限公司 Voltage and current sampling circuit and voltage and current sampling method in three-phase four-wire circuit
CN101458277B (en) * 2009-01-13 2011-02-09 中国计量科学研究院 Three phase electric energy measurement apparatus
CN102435801A (en) * 2011-10-25 2012-05-02 浙江华彩科技有限公司 Three-phase and thee-wire system high-voltage energy meter adopting combined instrument transformer
CN102608374A (en) * 2012-03-30 2012-07-25 辽宁省电力有限公司丹东供电公司 Portable unit power utilization metering device
CN102680779A (en) * 2012-04-23 2012-09-19 深圳华越南方电子技术有限公司 Adaptive control method for three-phase electric energy meter and three-phase electric energy meter
CN102890170A (en) * 2012-11-09 2013-01-23 成都天兴电气有限公司 Automatic false wiring conversion system for three-phase electric energy meter and implementation method thereof
CN104914302A (en) * 2015-06-05 2015-09-16 宁波三星智能电气有限公司 Voltage included angle-based electric energy meter voltage specification identification method
CN104950151A (en) * 2015-07-10 2015-09-30 成都天兴电气有限公司 Device for automatically switching three-wire and four-wire metering modes of three-phase electric energy meter

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101458277B (en) * 2009-01-13 2011-02-09 中国计量科学研究院 Three phase electric energy measurement apparatus
CN101819223A (en) * 2010-03-02 2010-09-01 南京亚派科技实业有限公司 Voltage and current sampling circuit and voltage and current sampling method in three-phase four-wire circuit
CN101819223B (en) * 2010-03-02 2013-01-30 南京亚派科技实业有限公司 Voltage and current sampling circuit and voltage and current sampling method in three-phase four-wire circuit
CN102435801A (en) * 2011-10-25 2012-05-02 浙江华彩科技有限公司 Three-phase and thee-wire system high-voltage energy meter adopting combined instrument transformer
CN102608374A (en) * 2012-03-30 2012-07-25 辽宁省电力有限公司丹东供电公司 Portable unit power utilization metering device
CN102680779A (en) * 2012-04-23 2012-09-19 深圳华越南方电子技术有限公司 Adaptive control method for three-phase electric energy meter and three-phase electric energy meter
CN102680779B (en) * 2012-04-23 2016-06-29 深圳华越南方电子技术有限公司 The self-adaptation control method of a kind of three-phase electric energy meter and three-phase electric energy meter
CN102890170A (en) * 2012-11-09 2013-01-23 成都天兴电气有限公司 Automatic false wiring conversion system for three-phase electric energy meter and implementation method thereof
CN104914302A (en) * 2015-06-05 2015-09-16 宁波三星智能电气有限公司 Voltage included angle-based electric energy meter voltage specification identification method
CN104950151A (en) * 2015-07-10 2015-09-30 成都天兴电气有限公司 Device for automatically switching three-wire and four-wire metering modes of three-phase electric energy meter

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20080402

Termination date: 20140611