CN102128977A - Single-phase watt-hour meter supporting two-way communication - Google Patents
Single-phase watt-hour meter supporting two-way communication Download PDFInfo
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Abstract
The invention provides a single-phase watt-hour meter supporting two-way communication. The watt-hour meter comprises a main control CPU (Central Processing Unit), a data acquisition unit, a data processing unit, a display unit and a communication device interface, wherein the data acquisition unit is used for acquiring a voltage signal and a current signal from a power line; the data processing unit is used for processing the acquired voltage signal and the acquired current signal and generating voltage quality information and electric energy metrical information; the display unit is used for displaying the voltage quality information and the electric energy metrical information; the communication device interface is used for connecting with a communication device; one of a plurality of communication devices in different communication systems is selected to be connected with the communication device interface and used for sending the voltage quality information and the electric energy metrical information to a far terminal; and the main control CPU controls the data acquisition unit, the data processing unit, the display unit, the communication device interface and the communication device connected with the communication device interface to work. The single-phase watt-hour meter supporting a plurality of communication systems is realized without changing any software and hardware of the single-phase watt-hour meter.
Description
Technical field
The present invention especially about family expenses single-phase electric energy meter technology, is a kind of single-phase electric energy meter of supporting two-way communication about the electric energy metrical technology of electric system concretely.
Background technology
Along with the construction and the development of intelligent grid, Utilities Electric Co. needs the more domestic consumer of understanding electricity consumption situation, understands the operation conditions of metering outfit.But the resident of prior art uses single-phase electric energy meter, only supports functions such as simple metering, pre-payment, can't satisfy the mutual requirement of Utilities Electric Co.'s more information.
Summary of the invention
The embodiment of the invention provides a kind of single-phase electric energy meter of supporting two-way communication, supports multiple communication standard in order to realization, and need not change the single-phase electric energy meter of any single-phase electric energy meter software and hardware.
The purpose of the embodiment of the invention is, a kind of single-phase electric energy meter of supporting two-way communication is provided, and this electric energy meter comprises: master cpu; Data acquisition unit is used for gathering voltage signal and current signal from line of electric force; Data processing unit is used for voltage signal and the current signal gathered are handled formation voltage quality information and electric energy metrical information; Display unit is used for described quality of voltage information and electric energy metrical information are shown; The communicator interface is used for being connected with a communicator; The communicator that a plurality of communication standards differ from one another is selected one and is connected with described communicator interface in the communicator that described a plurality of communication standards differ from one another, be used for described quality of voltage information and electric energy metrical information are sent to far-end; Described master cpu is controlled described data acquisition unit, data processing unit, display unit, communicator interface and the work of the communicator that is connected with described communicator interface.
The effect of the embodiment of the invention is, has realized supporting the single-phase electric energy meter of multiple communication module, and supports each communication module hot plug.Single-phase electric energy meter of the present invention both can have been supported at present the communication mode of main flow, can replace module at different requirements again, and need not change any single-phase electric energy meter software and hardware, thereby greatly reduce exploitation, production and maintenance cost.The present invention proposes to utilize broadband wireless (McWiLL), GPRS, power line carrier and small wireless communication mode, by event detection circuit and algorithm, make electric energy meter have automatic detection to multiplexing electric abnormality, stealing and ammeter fault etc., and the function that initiatively reports, solve the drawback of manual metering, improved work efficiency and power supply service quality greatly.Electric energy meter can be used as communication media simultaneously, realize the function of bidirectional real-time between display terminal-electric energy meter-main website, under the situation that does not need additional any communication media, realize the two-way interactive between power consumer and the Utilities Electric Co., satisfy the construction needs of intelligent grid.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Fig. 1 supports the single-phase electric energy meter structured flowchart of two-way communication for the present invention;
Fig. 2 supports the single-phase electric energy meter schematic appearance of two-way communication for the present invention;
Fig. 3 a to Fig. 3 d is the structured flowchart of communicator of the present invention;
Fig. 4 is the single-phase electric energy meter structured flowchart of the support two-way communication of the embodiment of the invention;
Fig. 5 is the remote communication devices interface synoptic diagram of the embodiment of the invention;
Fig. 6 is the remote communication devices interface pin definition synoptic diagram of the embodiment of the invention;
Fig. 7 is that the photoelectricity of the embodiment of the invention is isolated and remote communication devices interface circuit figure;
Fig. 8 is the synoptic diagram of the case sensor of embodiment of the invention electric energy meter;
Fig. 9 is the circuit diagram of the sensing circuit of uncapping of the embodiment of the invention;
Figure 10 is the relay of the embodiment of the invention and the circuit diagram of zero cross detection circuit.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the embodiment of the invention is described in further details below in conjunction with accompanying drawing.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
As shown in Figure 1, the single-phase electric energy meter of the support two-way communication of the specific embodiment of the invention comprises: master cpu 104, data acquisition unit 101 are used for gathering voltage signal and current signal from line of electric force; Data processing unit 102 is used for voltage signal and the current signal gathered are handled formation voltage quality information and electric energy metrical information; Display unit 103 is used for described quality of voltage information and electric energy metrical information are shown; Communicator interface 105 is used for being connected with a communicator; Communicator (the 106a that a plurality of communication standards differ from one another, 106b, 106c, 106d), communicator (the 106a that differs from one another at a plurality of communication standards, 106b, 106c selects one in 106d) and is connected with communication module interface 105 and is used for quality of voltage information and electric energy metrical information are sent to far-end; The work of master cpu 104 control data collecting units 101, data processing unit 102, display unit 103, communicator interface 105 and the communicator that is connected with described communicator interface.
As shown in Figure 2, schematic appearance for the single-phase electric energy meter 200 of the support two-way communication of the specific embodiment of the invention, single-phase electric energy meter 200 comprises: display screen 201, communicator slot 202, communicator interface (202a and 202b), communicator interface 202a is a data line interface, and communicator interface 202b is an electric source line interface, and communicator interface 202a and 202b also can merge into an interface.
In Fig. 2, communicator is modular design, utilizes general interface definition, can support GPRS, broadband wireless (McWiLL), low voltage power line carrier and short distance micropower wireless etc. simultaneously.The mode of transmission The data transparent forwarding, on the communication unit of electric energy meter body, carry out the parsing and the framing of data according to the specific communications stipulations, communicator only is responsible for communication frame is transmitted by the corresponding communication mode, thereby following more multi-communication mode all can seamlessly be linked in the up channel of electric energy meter.Communicator comprises: GPRS communicator 203a, 3G communicator 203b, carrier communication apparatus 203c and short-distance wireless communication device 203d.According to electric energy meter present located communication environment, in GPRS communicator 203a, 3G communicator 203b, carrier communication apparatus 203c and short-distance wireless communication device 203d, select an available communicator to be connected with 202b with communicator interface 202a.
Shown in Fig. 3 a, the GPRS communicator comprises: CPU303a, serial line interface 302a, LED light 304a, watchdog circuit 306a, storer 305a and McWiLL module 301a.GPRS GPRS (General Packet Radio Service) is based on the wireless, packet-switched technology of gsm system.Though the GPRS technology is the transitional technology of existing GSM network to the 3G (Third Generation) Moblie differentiation, all has advantage in many-side.The GPRS technology is suitable for the more data business, as mobile office chamber, Internet access etc., has more advantage in transfer rate, radio resource management, charging etc.Can realize the direct communication of electric energy meter and main website by GPRS communication, and need not other equipment transfers.
Shown in Fig. 3 b, the 3G communicator comprises: CPU303b, serial line interface 302b, LED light 304b, watchdog circuit 306b, storer 305b and GPRS communication module 301b.3G communication module 301b can adopt McWiLL (Multi-Carrier Wireless Information Local Loop, multi-carrier-wave wireless information local loop) module, and the McWiLL module is the broadband evolution version of SCDMA comprehensive wireless access technology.The McWiLL module is support voice business, data service, multimedia simultaneously, is the incorporate BWA of speech data.The single base station of McWiLL takies the carrier frequency bandwidth of 5MHz, and high-throughput is 15Mbit/s, and the high-throughput of terminal is 3Mbit/s, and multipotency is supported concurrent 300 road voice, be at present can be commercial, support ambulant BWA.It can realize the directly mutual in real time of electric energy meter and main website.
Shown in Fig. 3 c, carrier communication apparatus comprises: CPU303c, serial line interface 302c, LED light 304c, watchdog circuit 306c, storer 305c and 3G communication module 301c.Power line carrier, PLC module PLC is commonly called as " power line communications ", mainly is meant a kind of communication mode that utilizes power line transmission data and voice signal.Its advantage is to realize that cost is low, owing to can directly utilize existing distribution network as transmission line, thus need not additionally connect up, thus significantly reduced the investment of network, reduced cost.Line of electric force is the widest network of coverage, and its scale is that other any networks are incomparable.PLC can be penetrated into each family like a cork, for Internet development is created great space.PLC can provide transmission at a high speed.At present, its transfer rate is higher than far away and dials up on the telephone and ISDN between 4.5M～45Mbps, can support the application on the existing network.
Shown in Fig. 3 d, the short-distance wireless communication device comprises: CPU303d, serial line interface 302d, LED light 304d, watchdog circuit 306d, storer 305d and short-distance wireless communication module 301d.Short-distance wireless communication is meant: all transmission ranges are equal to or less than the wireless communication of IEEE 802.11 and 802.15 prescribed by standard scopes, and short-distance wireless communication is faster than third generation cellular device wireless data transmission, cost is lower, power consumption is littler.
Above-mentioned four kinds of communication modes can satisfy the communicating requirement of electric energy meter under the different power utilization environments, have improved the reliability of communication system, also make full collection, all standing of resident's power information require to be achieved.
Embodiment
As shown in Figure 4, the electric energy meter of present embodiment comprises: master cpu 404, data acquisition unit 401 are used for gathering voltage signal and current signal from line of electric force; Data processing unit 402 is used for voltage signal and the current signal gathered are handled formation voltage quality information and electric energy metrical information; Display unit 403 is used for quality of voltage information and electric energy metrical information are shown; Remote communication devices interface 405 is used for being connected with a communicator; Communicator (the 406a that a plurality of communication standards differ from one another, 406b, 406c, 406d), in the communicator that a plurality of communication standards differ from one another, select one and be connected, be used for quality of voltage information and electric energy metrical information are sent to far-end with remote communication devices interface 405; The work of master cpu 404 control data collecting units 401, data processing unit 402, display unit 403, remote communication devices interface 405 and the communicator that is connected with communicator interface 405.
The electric energy meter of present embodiment also comprises: photoelectric isolating circuit 407, remote communication devices interface 405 is connected with master cpu 404 by photoelectric isolating circuit 407.
The electric energy meter of present embodiment also comprises: case sensor 410 is used for the event signal of electric energy meter this locality is detected, and sends event signal to data processing unit 402 generation affair alarm information, by communicator affair alarm information is sent to far-end.Case sensor 410 comprises: electric energy meter uncap sensing circuit, the under-voltage sensing circuit of electric energy meter battery and/or power meter temperature sensor.
The electric energy meter of present embodiment also comprises: switch control unit 409, and this switch control unit 409 comprises: relay and zero cross detection circuit; Wherein, zero cross detection circuit is gathered fault-signal and operating state signal from described line of electric force, and sends fault-signal and operating state signal to master cpu 404, and master cpu 404 is according to fault-signal and the action of operating state signal pilot relay.
The electric energy meter of present embodiment also comprises: local communication unit 412 is used for quality of voltage information and electric energy metrical information are sent to near-end communication device.Local communication unit comprises: infrared communication module, RS485 communication module, M-BUS communication module or ZigBee communication module.
The electric energy meter of present embodiment also comprises: keyboard 408 and purchase electric card 411.
The communicator interface of present embodiment electric energy meter is supported hot plug, and electric energy meter can be supported communication standards such as GPRS, 3G, carrier wave and short-distance wireless communication simultaneously.Because the communication interface of the same GPRS of carrier wave, 3G has the part difference, electric energy meter has designed the electric interfaces of 4 kinds of modules of compatibility simultaneously, and the interface socket arrangement of communication device and electric energy meter as shown in Figure 5.
Be illustrated in figure 6 as remote communication devices interface pin definition synoptic diagram; Wherein, MRX is that communicator receives electric energy meter cpu signal pin (5V Transistor-Transistor Logic level); MTX is that communicator sends signal pins (5V Transistor-Transistor Logic level) for electric energy meter CPU; MGND is for communicatedly; MDC5V is the analog power of GPRS, 3G and carrier wave, is provided by electric energy meter.MDC12V is another power supply of carrier wave, carrier module that can compatible 5V and the carrier module of 12V; 1ZBSET is the signalization pin (compatible 5V and 12V level) of carrier wave; 1ZBRST is the reset signal pin (compatible 5V and 12V level) of carrier wave.
As shown in Figure 7, photoelectricity is isolated and remote communication devices interface circuit figure; Use optical coupling isolation circuit to guarantee the security of hot plug between master cpu and the communicator.Use the UART pin of standard to guarantee the replaceable of different communication module simultaneously.Under situation about not having a power failure, change other communication modules after, communication port can automatically switch, and changes through the communicator of this single-phase electric energy meter of new communication media notice main website.The modular design that communication interface adopts can be satisfied communicator and exchange requirement, supports the more seamless access of multi-communication mode.Leave unified electric level interface in the hardware and software design, parameter, unified routine interface guarantees seamless access.
As shown in Figure 8, the electric energy meter of present embodiment also comprises: case sensor, be used for the event signal of electric energy meter this locality is detected, and send event signal to data processing unit generation affair alarm information, affair alarm information is sent to far-end by communicator.Case sensor comprises: electric energy meter uncap sensing circuit, the under-voltage sensing circuit of electric energy meter battery and/or power meter temperature sensor.
This electric energy meter has to detect sees that table covers and open the function of terminal cap.Shown in 9 figure, the IO mouth of master cpu links to each other with the KBGJL mouth as input end.By sensor, whether the terminal cap that K4 can detect ammeter is opened, and promptly terminal cap is opened, then the K4 closure; Terminal cap is closed, and then K4 disconnects.Master cpu detected the state of a K4 in per 1 second, in case after it is in off-state and surpasses set point number, then be considered as the incident of once uncapping, carried out record.As shown in Figure 9, when terminal cap was not opened, the KBGJL signal of linking master cpu was always for high (equaling VCP voltage), and when terminal cap was opened, the KBGJL signal of linking master cpu had been finished the detection to uncapping then by K4 ground connection (DGND).After master cpu detects the incident of uncapping, can give main website with this reporting events immediately.
The under-voltage reporting functions of battery: Battery is a 3.6V battery sign, provides 3.3V power supply by being provided as master cpu and storer etc. after the diode step-down.Big resistance R 73, the R74 of two 10M resistances drop to a half value with battery voltage value, and voltage BT3CHK is delivered to the thief hatch of master cpu, master cpu compares by value and the reference voltage that 10 high-speed a/d sampling thief samplings obtain, and obtains battery voltage value accurately.If battery voltage value is lower than certain critical point, the reporting events that master cpu is under-voltage with battery is at once given main platform, and notice electric company in time changes battery.
Temperature anomaly reports: use intelligent temperature sensing chip TCN75 to be used to detect real time temperature, if temperature anomaly, electric energy meter can report these abnormal conditions.TCN75 is the temperature sensor of serial programmable, and when environment temperature surpassed the set point that the user compiles and edits, it can send to the electric energy meter master cpu by 2 line bus IIC_SDA and IIC_SCL.
As shown in figure 10, be the circuit diagram of relay and zero cross detection circuit.Wherein, CS5463 is the zero cross signal detection chip.The INT pin of CS5463 can be used to notify CS5463 that some incident has taken place, and these incidents comprise the state and the internal fault status of chip operation.Status register and mask register combination will produce the INT signal.Behind 220V city electric signal UN process resistor network R20, R21, R22, R23, R24, R25, R26, the R27, be transformed into differential input signal source VIN+ and VIN-port that sine wave signal that amplitude is about 2V is input to CS5463, finished real-time sampling civil power.
It is effective that present embodiment is configured to rising edge with the triggering mode of INT pin, and the INT mouth of CS5463 is connected on the middle port INT1 of master cpu.When the sinusoidal waveform of UN transfers anode to from negative terminal, and just through the moment of zero crossing, CS5463 sends a pulse signal to the INT mouth immediately.After master cpu middle port INT1 receives signal, enter interrupt service subroutine immediately, finish real-time monitoring the civil power zero cross signal.Owing to adopted above-mentioned zero passage detection technology, disconnected the characteristic of relay when this circuit has voltage zero-cross.Therefore can solve relay effectively under capacitive and perceptual situation, reduce the fiery arc that produces between the electric shock of relay live wire and zero line, increase the reliability and the life-span of relay greatly.
The relay radiating mode, the rational space layout of relay leaves than large space around the relay, and relay does not directly contact with drain pan, and cross-ventilation has been considered in the installation site of relay, more helps heat radiation.Relay outer end live wire and zero line interface use the blister copper bar of symmetry, are beneficial to heat conduction.The influence of external magnetic field that cooperated good treatment of relay and shunt.
The communication system power supply of the single-phase electric energy meter in the technical program can satisfy zero requirement of shutting down, and the function that power module possesses hot plug satisfies zero shutdown requirement.Hot plug requires also to be to prevent system mistake.But because disparate modules has different qualities, so present technique has satisfied following hardware requirement:
When 1) carrying out hot plug, hardware can bear the surge voltage of moment generation and the influence of surge current, eliminates between socket and produces spark.
2) after the hot plug, the load of the hardware system of single-phase electric energy meter is taken over along sliding, to prevent because of changing the adjusting that influences output voltage suddenly.Concrete hardware design comprises the definition to module interface, the interface circuit design and the communications portion design of electric energy meter communication module.
The embodiment of the invention makes single-phase electric energy meter software and hardware compatible multiple communication module simultaneously; And multiple communication module can be hot-swappable; Electric energy meter is reported event initiatively; Electric energy meter transmits information such as message, data, voice as communication media.The embodiment of the invention is supported multiple communication mode, simultaneously compatible low voltage power line carrier, GPRS, short-distance wireless communication and four kinds of channels of broadband wireless communications (McWiLL).When replacing communication module, single-phase electric energy meter need not outage, need not to change any design of hardware and software, satisfies the construction needs of following intelligent grid.By the two-way communication of electric energy meter, electric energy meter is the active reported event in real time, and transmit data functionality such as telecommunication media transmission note, voice and video can also be provided.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. single-phase electric energy meter of supporting two-way communication, described electric energy meter comprises: master cpu; It is characterized in that described electric energy meter also comprises:
Data acquisition unit is used for gathering voltage signal and current signal from line of electric force;
Data processing unit is used for voltage signal and the current signal gathered are handled formation voltage quality information and electric energy metrical information;
Display unit is used for described quality of voltage information and electric energy metrical information are shown;
The communicator interface is used for being connected with a communicator;
The communicator that a plurality of communication standards differ from one another is selected one and is connected with described communicator interface in the communicator that described a plurality of communication standards differ from one another, be used for described quality of voltage information and electric energy metrical information are sent to far-end;
Described master cpu is controlled described data acquisition unit, data processing unit, display unit, communicator interface and the work of the communicator that is connected with described communicator interface.
2. electric energy meter as claimed in claim 1 is characterized in that, the communicator that described a plurality of communication standards differ from one another comprises: GPRS communicator, 3G communicator, carrier communication apparatus and short-distance wireless communication device.
3. electric energy meter as claimed in claim 2 is characterized in that, described GPRS communicator comprises: CPU, serial line interface, LED light, watchdog circuit, storer and GPRS communication module;
Described 3G communicator comprises: CPU, serial line interface, LED light, watchdog circuit, storer and 3G communication module;
Described carrier communication apparatus comprises: CPU, serial line interface, LED light, watchdog circuit, storer and Power Line Carrier Communication Module;
Described short-distance wireless communication device comprises: CPU, serial line interface, LED light, watchdog circuit, storer and short-distance wireless communication module.
4. electric energy meter as claimed in claim 1 is characterized in that, described electric energy meter also comprises: photoelectric isolating circuit, described communicator interface is connected with described master cpu by described photoelectric isolating circuit.
5. electric energy meter as claimed in claim 1, it is characterized in that, described electric energy meter also comprises: case sensor, be used for the event signal of electric energy meter this locality is detected, and send described event signal to described data processing unit and generate affair alarm information, by described communicator described affair alarm information is sent to far-end.
6. electric energy meter as claimed in claim 5 is characterized in that, described case sensor comprises: electric energy meter uncap sensing circuit, the under-voltage sensing circuit of electric energy meter battery and/or power meter temperature sensor.
7. electric energy meter as claimed in claim 1 is characterized in that, described electric energy meter also comprises: relay and zero cross detection circuit; Wherein,
Described zero cross detection circuit is gathered fault-signal and operating state signal from described line of electric force, and sending described fault-signal and operating state signal to described master cpu, described master cpu is controlled the described actuating of relay according to described fault-signal and operating state signal.
8. electric energy meter as claimed in claim 1 is characterized in that, described electric energy meter also comprises: local communication unit is used for described quality of voltage information and electric energy metrical information are sent to near-end communication device.
9. electric energy meter as claimed in claim 8 is characterized in that, described local communication unit comprises: infrared communication module, RS485 communication module, M-BUS communication module or ZigBee communication module.
10. electric energy meter as claimed in claim 1 is characterized in that, described electric energy meter also comprises: keyboard and purchase electric card.
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| CN102496260A (en) * | 2011-11-23 | 2012-06-13 | 青岛乾程电子科技有限公司 | Multiple communication technology type of method for electric power information acquisition control |
| CN102868437A (en) * | 2012-09-21 | 2013-01-09 | 五邑大学 | Wireless data transmission system of load control terminal for communication signal blind area |
| CN103645376A (en) * | 2013-11-15 | 2014-03-19 | 益和电气集团股份有限公司 | Digital current voltmeter of wireless transmission signal |
| CN104077907A (en) * | 2014-07-10 | 2014-10-01 | 国家电网公司 | Device and method for forwarding electricity consumption information parameters of electric energy meter |
| CN104079319A (en) * | 2013-03-26 | 2014-10-01 | 杨晨 | Carrier multi-mode and multi-channel system |
| CN104980188A (en) * | 2014-04-03 | 2015-10-14 | 翼咏科技股份有限公司 | Power line network device and power line network communication set |
| CN105654708A (en) * | 2016-01-25 | 2016-06-08 | 广州南方电力集团科技发展有限公司 | Intelligent meter reading structure based on all-standard multi-mode mobile data services |
| CN105911344A (en) * | 2016-04-26 | 2016-08-31 | 宁波三星智能电气有限公司 | Intelligent electric energy meter supporting electric leakage protection |
| CN106291088A (en) * | 2016-07-25 | 2017-01-04 | 广东工业大学 | A kind of intelligent electric meter |
| CN106329721A (en) * | 2016-06-01 | 2017-01-11 | 杭州华泰电气技术有限公司 | Integrated intelligent ammeter and electric power measurement and control protection system |
| CN107238739A (en) * | 2017-07-07 | 2017-10-10 | 溧阳市华鹏电力仪表有限公司 | A kind of intelligent integrated formula ammeter and its operating method |
| CN108880902A (en) * | 2018-07-05 | 2018-11-23 | 南京英安特科技实业有限公司 | A kind of Generic Alert device and mobile network's module interface implementation method |
| CN109358219A (en) * | 2018-11-20 | 2019-02-19 | 华立科技股份有限公司 | Thermostat and electric energy meter |
| CN109406871A (en) * | 2018-09-07 | 2019-03-01 | 国网安徽省电力有限公司淮南供电公司 | The data transferring method of metering system built in a kind of ring network cabinet |
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| CN104077907A (en) * | 2014-07-10 | 2014-10-01 | 国家电网公司 | Device and method for forwarding electricity consumption information parameters of electric energy meter |
| CN105654708A (en) * | 2016-01-25 | 2016-06-08 | 广州南方电力集团科技发展有限公司 | Intelligent meter reading structure based on all-standard multi-mode mobile data services |
| CN105911344A (en) * | 2016-04-26 | 2016-08-31 | 宁波三星智能电气有限公司 | Intelligent electric energy meter supporting electric leakage protection |
| CN106329721A (en) * | 2016-06-01 | 2017-01-11 | 杭州华泰电气技术有限公司 | Integrated intelligent ammeter and electric power measurement and control protection system |
| CN106329721B (en) * | 2016-06-01 | 2019-01-04 | 杭州华泰电气技术有限公司 | Integral intelligent electric energy meter and electric-power metering and Control protection system |
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