CN203552356U - Three-phase wide-range prepayment intelligent electric energy meter - Google Patents
Three-phase wide-range prepayment intelligent electric energy meter Download PDFInfo
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- CN203552356U CN203552356U CN201320645860.1U CN201320645860U CN203552356U CN 203552356 U CN203552356 U CN 203552356U CN 201320645860 U CN201320645860 U CN 201320645860U CN 203552356 U CN203552356 U CN 203552356U
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Abstract
The utility model provides a three-phase wide-range prepayment intelligent electric energy meter capable of meeting wide-current range metering requirements. The intelligent electric energy meter comprises an MCU (micro control unit) module, and an electric energy metering module, a power module, a clock module, a communication interface and a charge-controlled encryption module, which are connected with the MCU module, wherein the electric energy metering module is also connected with a voltage and current sampling module; the power module is also connected with the electric energy metering module. According to the three-phase wide-range prepayment intelligent electric energy meter, the active precision can reach the 0.5 level, the current range can reach 1(80)A, a metering error within the current range is +/-0.2 percent, and the current measurement accuracy is kept unchanged under the condition of a temperature coefficient of lower than +/-150ppm/DEG C; the intelligent electric energy meter can be converted between a prepayment electric energy meter and a non-prepayment electric energy meter; a communication module and a data storage module are connected with the MCU module, so that a plurality of functions of electric energy data recording, remote communication and the like are realized, and the intelligent electric energy meter is convenient to operate.
Description
Technical field
The utility model relates to a kind of electric energy meter, especially a kind of three-phase wide-range prepaid intelligent electric energy meter.
Background technology
Current specification is an important parameter of electric energy meter, by this parameter, can reflect that an electric energy meter can measure the levels of precision of user power utilization load institute consumption of electric power, generally with fundamental current Ib/ rated current I n and maximum current I max, represents.As 5 (60) common A, 10 (40) A, 20 (80) A etc.In the company standard Q/GDW364-2009 of State Grid Corporation of China, stipulate, electric energy meter adopts direct insertion type, and maximum current is preferably fundamental current more than 4 times.Owing to serviceable life of electric energy meter being generally 10 years, during this period of time, but the need for electricity of resident, industry, enterprise may be installed and within several years, occur afterwards larger growth at electric energy meter, especially in the peak electricity consumption period all occurring every year, make maximum power load may approach the maximum current that even surpasses electric energy meter.For Electrical Safety needs, Utilities Electric Co. has to change in a large number at the beginning of serviceable life, the electric energy meter in mid-term, causes a large amount of wastings of resources.
The scope of general current specification is relevant to the dynamic range of metering section A/D sampling.For Utilities Electric Co., the computation chip dynamic range of having been put on market limits, and has to electric energy meter to stipulate more current specification, to adapt to different power load users' demand.The electric energy meter that estimated current specification is more, the resource that has strengthened Utilities Electric Co. and electric energy meter manufacturing enterprise drops into, and has increased the kind of checkout equipment and the stock of quantity and product standby redundancy, has restricted the standardized management process of core manufacturing enterprise of Utilities Electric Co..
Therefore, objectively needing a kind of current specification to meet the demand of all users to power load, is the common demand of Utilities Electric Co. and electric energy meter enterprise.
Utility model content
The purpose of this utility model is to provide a kind of three-phase wide-range prepaid intelligent electric energy meter that can meet wide current range metering.
The three-phase wide-range prepaid intelligent electric energy meter of realizing the utility model object, comprises MCU module, the electric energy metering module being connected with described MCU module, power module, clock module, communication interface and expense control encrypting module; Described electric energy metering module is also connected with electric current and voltage sampling module, and described power module is also connected with electric energy metering module.
Described electric current and voltage acquisition module comprises voltage branch circuit, and described voltage branch circuit is resistance series connection bleeder circuit, and described resistance series connection bleeder circuit comprises precision resistance and filter capacitor.For guaranteeing precision, sampling resistor all adopts the precision resistance of high stable, and error is that the current signal of 25ppm process current transformer (Ia, Ib, Ic) is converted to by current signal the current channel input pin that signal is input to metering module through current sampling circuit.
Described power module is transformed into the required DC low-voltage ± 5v of electronic circuit by 50Hz electrical network 220V AC high-voltage potential.Realize electric energy meter and the isolation of extraneous AC network electrical equipment, avoided electric network noise to invade.
Described electric energy metering module adopts the IDT90E32 chip that possesses wide electric current function of measuring, and meter dynamic range can reach 6000:1.
That described MCU module adopts is NEC1166.
Described MCU module is also connected with data memory module.
Described communication interface comprises RS485, infrared, carrier wave and micro power radio communication interface.
Described expense control encrypting module comprises the expense control CPU card interface of being located in MCU module, and is installed on the safety encipher chip ESAM in described expense control CPU card interface.
Described MCU module is also connected with pulse output module.
Described MCU module is also connected and is connected to button/LCD display module.
The beneficial effects of the utility model are as follows: three-phase wide-range prepaid intelligent electric energy meter of the present utility model, and meritorious precision can reach 0.5 grade; Current range can reach 1 (80) A, has realized error in dipping in range of current to be better than ± 0.2%, and at temperature coefficient, lower than ± 150ppm/ ℃ in the situation that, the degree of accuracy of current measurement remains unchanged.Can realize the conversion between prepayment meter and non-prepayment meter; Be provided with the communication module and the data memory module that are connected with MCU, realized the various functions such as energy data record, telecommunication, and whole ammeter volume be little, easy to operate, for electric energy metrical provides powerful protective capacities.
Accompanying drawing explanation
Fig. 1 is the structural representation of three-phase wide-range prepaid intelligent electric energy meter of the present utility model.
Embodiment
Embodiment of the present utility model is as follows: as shown in Figure 1, the three-phase wide-range prepaid intelligent electric energy meter of realizing the utility model object of the present utility model, comprise MCU module 1, the electric energy metering module 3 being connected with described MCU module 1, power module 2, clock module 5, communication interface 7 and expense control encrypting module 8; Described electric energy metering module 3 is also connected with electric current and voltage sampling module 4, and described power module 2 is also connected with electric energy metering module 3.Described MCU module 1 is also connected with data memory module 6, pulse output module 9 and button/LCD display module 10.
Described electric current and voltage acquisition module 4 comprises voltage branch circuit, and described voltage branch circuit is resistance series connection bleeder circuit, and described resistance series connection bleeder circuit comprises precision resistance and filter capacitor.For guaranteeing precision, sampling resistor all adopts the precision resistance of high stable, and error is that the current signal of 25ppm process current transformer (Ia, Ib, Ic) is converted to by current signal the current channel input pin that signal is input to metering module through current sampling circuit.
Described electric current and voltage acquisition module 4 is sent to electric energy metering module 3 voltage, current signal after processing, special-purpose electric energy computation chip obtains respectively voltage, the current sampling signal of each phase from electric current and voltage sampling module 4, meritorious and reactive energy to electrical network consumption measures, continuous data is stored in the register of self simultaneously, waits for reading of Micro-processor MCV module 1.After voltage signal is processed by power module 2 simultaneously, for showing interior all chips, provide operating voltage.
Described electric energy metering module 3 adopts the IDT90E32 chip that possesses wide electric current function of measuring, and meter dynamic range can reach 6000:1.
That described MCU module 1 adopts is NEC1166.
Described communication interface 7 comprises RS485 interface 11, infrared interface 12, carrier interface 13 and micro power radio communication interface 14.
Described expense control encrypting module 8 comprises the expense control CPU card interface of being located in MCU module 1, and is installed on the safety encipher chip ESAM in described expense control CPU card interface.
Clock module is the basis of multifunction electric meter time-division operation, for the clearing of the calculating electric weight of requirement, freezing data provides clock signal accurately on time, by carrying out different rates in the different periods, effectively regulate imbalance between power supply and demand, regulate load curve, improve the unbalanced phenomenon of power consumption.
Data memory module is as the data-carrier store in electric energy meter, and read-write number of times is quite frequent, should select to be permitted to write the satisfied repeatedly storer of read-write.Consider that ammeter can preserve in time data when power down, should select fireballing storer.Consider and save the I/0 mouth line of single-chip microcomputer and the convenience of wiring, select the storer of serial.
Communication interface mainly refers to that electric energy meter does communicating by letter of as a whole and kilowatt meter reading-out system (write by hand device), mainly comprises RS485, infrared, carrier wave, four kinds of modes of micro power radio communication.
Expense control encrypting module is ESAM embedded safe control module, in electric energy meter, as wallet, uses, and the amount of money and some other important parameter are supplemented and consumed in storage with money, have identity recognition function simultaneously, carry out bidirectional identity authentication with outside card.Can also realize the safe storage of data, the functions such as identification and authentication of the encryption and decryption of data, terminal identity.
Button/LCD display module is divided into LCD (Liquid Crystal Display) liquid-crystal display section and LED display section.LCD is used for showing current and historical electric quantity data, current and historical requirement data, the data such as date, time, voltage, electric current, power, power factor; LED, for ammeter abnormal alarm, comprises disconnected phase, negative phase sequence, defluidization, battery undervoltage warning etc.
Three-phase wide-range prepaid intelligent electric energy meter, adopting IDT90E32 dynamic range is 6000:1 electric energy meter application-specific integrated circuits, realized the design of the wide magnitude electrical energy meter of current specification 1 (80) A, test result shows, electric energy meter, in the range of current of 20mA-80A, has the error in dipping of function electric energy to be better than ± 0.2%.To electric energy meter manufacturer, wide magnitude electrical energy meter is conducive to reduce the multiple current specification electric energy meter of current existence, thereby simplifies electric energy meter production complexity; Measurement centre of Er Dui Utilities Electric Co., the simple and standby table quantity of calibration model is unified, and calibration efficiency obviously improves, and can reduce the dead storage table of Utilities Electric Co., simplifies user management, reduces handling cost.
This table has been realized forward and reverse active energy function of measuring, supports point, peak, flat, four rates of paddy, under gradient quantitative model, only counts total electricity consumption, is the power consumption between twice clearing between message area.By CPU card, realize the switching of prepayment meter and non-prepayment meter, under pre-payment pattern, can realize remote bill control function.Electric energy meter provides meritorious pulse output, and pulse output width is (80 ± 20) ms.Multifunctional testing terminal, can arrange it by software and be output as clock pulse per second (PPS) or period switching signal.Electric energy meter also has clearing, logout, freezes, power cut-off recording, acousto-optic lock is reported to the police and the several functions such as System self-test, and by infrared, RS485, carrier interface, facilitating power department to realize computer network management, is a electric energy meter product being worthy to be popularized.
Embodiment recited above is described preferred implementation of the present utility model; not scope of the present utility model is limited; design under spiritual prerequisite not departing from the utility model; various distortion and improvement that the common engineering technical personnel in this area make technical solutions of the utility model, all should fall in the definite protection domain of claims of the present utility model.
Claims (6)
1. a three-phase wide-range prepaid intelligent electric energy meter, is characterized in that: comprise MCU module, the electric energy metering module being connected with described MCU module, power module, clock module, communication interface and expense control encrypting module; Described electric energy metering module is also connected with electric current and voltage sampling module, and described power module is also connected with electric energy metering module; Described electric current and voltage acquisition module comprises voltage branch circuit, and described voltage branch circuit is resistance series connection bleeder circuit, and described resistance series connection bleeder circuit comprises precision resistance and filter capacitor; Described communication interface comprises RS485, infrared, carrier wave and micro power radio communication interface; Described expense control encrypting module comprises the expense control CPU card interface of being located in MCU module, and is installed on the safety encipher chip ESAM in described expense control CPU card interface; Described MCU module is also connected with pulse output module.
2. three-phase wide-range prepaid intelligent electric energy meter according to claim 1, is characterized in that: described power module is transformed into the required DC low-voltage ± 5v of electronic circuit by 50Hz electrical network 220V AC high-voltage potential.
3. three-phase wide-range prepaid intelligent electric energy meter according to claim 1, is characterized in that: described electric energy metering module adopts the IDT90E32 chip that possesses wide electric current function of measuring, and meter dynamic range can reach 6000:1.
4. three-phase wide-range prepaid intelligent electric energy meter according to claim 1, is characterized in that: that described MCU module adopts is NEC1166.
5. according to the arbitrary described three-phase wide-range prepaid intelligent electric energy meter of claim 1～4, it is characterized in that: described MCU module is also connected with data memory module.
6. according to the arbitrary described three-phase wide-range prepaid intelligent electric energy meter of claim 1～4, it is characterized in that: described MCU module is also connected and is connected to button/LCD display module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320645860.1U CN203552356U (en) | 2013-10-20 | 2013-10-20 | Three-phase wide-range prepayment intelligent electric energy meter |
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| CN201320645860.1U CN203552356U (en) | 2013-10-20 | 2013-10-20 | Three-phase wide-range prepayment intelligent electric energy meter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330619A (en) * | 2014-09-16 | 2015-02-04 | 杭州西力电能表制造有限公司 | Transformer electric energy meter and thermal equilibrium calculating alarm method thereof |
| CN105845007A (en) * | 2016-06-13 | 2016-08-10 | 国网辽宁省电力有限公司朝阳供电公司 | Intelligent electric energy meter simulation application test stand and use method thereof |
| CN107144712A (en) * | 2017-05-17 | 2017-09-08 | 国网天津市电力公司 | A kind of intelligent wiring box |
| CN108398594A (en) * | 2018-03-08 | 2018-08-14 | 广西网冠电气有限公司 | A kind of intelligent simulation three-phase electric energy meter |
| CN108597123A (en) * | 2018-05-16 | 2018-09-28 | 广东电网有限责任公司 | A kind of three-phase remote is multi-functional to take control electric energy meter device |
-
2013
- 2013-10-20 CN CN201320645860.1U patent/CN203552356U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330619A (en) * | 2014-09-16 | 2015-02-04 | 杭州西力电能表制造有限公司 | Transformer electric energy meter and thermal equilibrium calculating alarm method thereof |
| CN105845007A (en) * | 2016-06-13 | 2016-08-10 | 国网辽宁省电力有限公司朝阳供电公司 | Intelligent electric energy meter simulation application test stand and use method thereof |
| CN107144712A (en) * | 2017-05-17 | 2017-09-08 | 国网天津市电力公司 | A kind of intelligent wiring box |
| CN108398594A (en) * | 2018-03-08 | 2018-08-14 | 广西网冠电气有限公司 | A kind of intelligent simulation three-phase electric energy meter |
| CN108597123A (en) * | 2018-05-16 | 2018-09-28 | 广东电网有限责任公司 | A kind of three-phase remote is multi-functional to take control electric energy meter device |
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