CN203911585U - Intelligent metering terminal based on transformer substation intelligent metering system - Google Patents
Intelligent metering terminal based on transformer substation intelligent metering system Download PDFInfo
- Publication number
- CN203911585U CN203911585U CN201420249210.XU CN201420249210U CN203911585U CN 203911585 U CN203911585 U CN 203911585U CN 201420249210 U CN201420249210 U CN 201420249210U CN 203911585 U CN203911585 U CN 203911585U
- Authority
- CN
- China
- Prior art keywords
- intelligent metering
- intelligent
- metering terminal
- circuit
- clock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004891 communication Methods 0.000 claims abstract description 19
- 238000004458 analytical method Methods 0.000 claims abstract description 13
- 230000003750 conditioning effect Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000003993 interaction Effects 0.000 abstract description 2
- 206010063385 Intellectualisation Diseases 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 230000006870 function Effects 0.000 description 10
- 238000005070 sampling Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000013500 data storage Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000006855 networking Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010223 real-time analysis Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
Abstract
The utility model provides an intelligent metering terminal based on a transformer substation intelligent metering system. The intelligent metering terminal comprises a main controller, a clock and storage circuit, a power switching and watch dog, an AD convertor, a signal processing circuit, a CAN receiver, a power supply system, a backup battery and a local debugging interface. According to the utility model, the intelligent metering terminal can be installed on a multipath outgoing line; based on the CAN bus communication network, information interaction of the multipath intelligent metering terminal can be achieved; the intelligent metering terminal is highly reliable and small in redundancy rate; and by use of a concentration analysis unit, remote transmission of acquired electric energy information is achieved via a special interface and a remote control channel. Thus, a novel means and a system tool are provided for informatization and intellectualization of the transformer substation metering.
Description
Technical field
The utility model belongs to transformer station's field of measuring techniques, particularly relates to a kind of intelligent metering terminal based on intelligent substation metering system.
Background technology
Electric energy meter is device the most key in electric energy metered system, from 1880 in the world first utilize direct current energy meter that electrolysis principle makes till now, the history that the development of electric energy meter has been passed by more than 100 year, electric energy meter has been brought into play huge effect.
The producer that produces in the world at present electronic electric energy meter mainly contains: Switzerland Lan Disi company, French Schlumberger company, ABB AB, GE company, SIEMENS company etc.China develops electronic electric energy meter since the beginning of the nineties in last century, the released one after another three phases electronic energy meter technology and much other company and enterprise have developed the single-phase and three phases electronic energy meter of polytype, specification in succession such as Wei Sheng group, section's land electronics, Huali Group, Heng Tong company.Through introducing, digest, absorbing, the electronic electric energy meter R&D and production of China starts to enter the Rapid development stage tallying with the national condition.
At present, along with the starting of China's power market reform and deeply, China state net, the overwhelming majority of economizing in net Source of Gateway Meter at different levels have been updated to electronic electric energy meter, most of is import table meter, but low-voltage customer and ordinarily resident user's electronic electric energy meter are also not universal, and part province power supply department is being promoted the use of electronic electric energy meter in low pressure and ordinarily resident user with very fast speed.
Digital electric energy meter has become domestic and international electric power meter research and the main flow of applying at present, business-like electric energy metrical special integrated chip emerges in an endless stream, as the MCP3905/MCP3906 of Microchip Technology (Microchip Technology), the ADE7760/ADE7761 of ADI (Analog Device), this series products also has MXT7755, ATT7022B, FS6611, TM7755 etc.Above-mentioned electric energy metrical special integrated chip all has successful Application in electric power system.But the measurement point of electric energy metrical concentrates on the client of power consumer mostly at present, take electricity charge charging as main purpose, or the total electric energy of whole power distribution station is measured, and generally do not install electric power meter at each leading-out terminal of power distribution station.Long-distance meter-reading system based on wired or wireless GSM/GPRS/CDMA network also has more successful Application in electric power system, as the wireless kilowatt meter reading-out system of Hangzhou Lierda Technology Co., Ltd..These digital electric energy meters and networking kilowatt meter reading-out system have that accurate measurement, integrated level are high, operating efficiency advantages of higher.
But existing electric energy metered system function mostly only has the simple function of electric energy metrical, do not possess the functions such as data storage, power quality analysis, failure wave-recording.And do not install electric power meter at each leading-out terminal of power distribution station, and cannot monitor, record the electric energy situation of each road leading-out terminal, also cannot monitor each circuit line loss and circuit and steal electric behavior.
Summary of the invention
In order to address the above problem, the purpose of this utility model is to provide a kind of intelligent metering terminal based on intelligent substation metering system.
In order to achieve the above object, the intelligent metering terminal based on intelligent substation metering system that the utility model provides comprises: master controller, clock and memory circuit, electrical source exchange and house dog, AD converter, signal conditioning circuit, CAN transceiver, power-supply system, backup battery and local debugging interface; Wherein: master controller is connected with house dog, AD converter, CAN transceiver and local debugging interface with clock and memory circuit, electrical source exchange respectively; Electrical source exchange is connected with clock and memory circuit with house dog, backup battery is connected with clock and memory circuit, AD converter is connected with signal detection device by signal conditioning circuit, CAN transceiver is connected with CAN bus communication network, and power-supply system is connected with house dog, AD converter and signal conditioning circuit with master controller, electrical source exchange respectively.
Described CAN bus communication network is serial communication network, and it is comprised of communicate by letter twisted-pair feeder and 3 core power lines, and it is laid in cable testing bridge, and intelligent metering terminal is connected with bus mode with collective analysis unit.
The intelligent metering terminal based on intelligent substation metering system that the utility model provides is arranged in multichannel outlet, based on CAN bus communication network, realize the information interaction of multi-way intelligence measuring terminal, reliability is high and redundancy is little, the energy information gathering utilizes collective analysis unit by special purpose interface and telecontrol channel, realize teletransmission and real-time analysis means are provided, and the informationization and the intelligent analysis that for transformer station, measure provide a kind of new means and system tool.
Accompanying drawing explanation
Fig. 1 is the structural representation of networking intelligent substation metering system.
The intelligent metering terminal logic block diagram based on intelligent substation metering system that Fig. 2 provides for the utility model.
Fig. 3 is FM33256 memory circuit figure.
Fig. 4 is RC low-pass filter circuit figure.
Fig. 5 is AD73360L functional block diagram.
Fig. 6 is AD conditioning and sample circuit schematic diagram.
Fig. 7 is AD73360L and dsp interface circuit diagram.
Fig. 8 is AD73360L synchronous serial interface communication succession figure.
Fig. 9 is CAN bus circuit figure.
Embodiment
The intelligent metering terminal based on intelligent substation metering system the utility model being provided below in conjunction with the drawings and specific embodiments is elaborated.
As shown in Figure 1, networking intelligent substation metering system is comprised of collective analysis unit 1, CAN bus communication network 2 and 3 three parts of Duo Tai intelligent metering terminal; Collective analysis unit 1 is connected with many intelligent metering terminals 3 by CAN bus communication network 2; Wherein: intelligent metering terminal 3 is keys of whole system, for the information about power of collection site power supply unit, it should adopt threephase potential transformer, the threephase current transformer of high accuracy for metering, to guarantee to measure the precision of calculating.In the outgoing switch cubicle of every road, have current transformer, voltage transformer signal need cause each outgoing switch cubicle from each section of bus PT cabinet.Voltage transformer, Current Transformer Secondary side signal are carried out to preliminary treatment, obtain being suitable for the voltage signal of A/D sampling, deliver to A/D sampling channel, the digital signal that application sample obtains is carried out computing, obtain the parameters such as active energy, reactive energy, power factor, electric voltage frequency, and can expand functions such as realizing harmonic measure, power quality analysis, failure wave-recording, relevant parameter is uploaded to collective analysis unit by CAN bus.Collective analysis unit, after obtaining the data of each intelligent metering terminal, can be connected with the existing Electric Energy Acquisition System of Shanghai Power Company and automation equipment interface.
As shown in Figure 2, the intelligent metering terminal 3 that the utility model provides comprises: master controller 31, clock and memory circuit 32, electrical source exchange and house dog 33, AD converter 34, signal conditioning circuit 35, CAN transceiver 36, power-supply system 37, backup battery 38 and local debugging interface 39; Wherein: master controller 31 is connected with house dog 33, AD converter 34, CAN transceiver 36 and local debugging interface 39 with clock and memory circuit 32, electrical source exchange respectively; Electrical source exchange is connected with clock and memory circuit 32 with house dog 33, backup battery 38 is connected with clock and memory circuit 32, AD converter 34 is connected with signal detection device by modulate circuit 35, CAN transceiver 36 is connected with CAN bus communication network 2, and power-supply system 37 is connected with house dog 33, AD converter 34 and signal conditioning circuit 35 with master controller 31, electrical source exchange respectively.
Due to measuring terminal, be designed with the electric energy quality monitoring functions such as harmonic wave, tri-phase unbalance factor, so do not adopt table meter chip, adopt the hardware plan of High Performance DSP and table meter sigma-delta AD, this system can be obtained the Direct Sampling point of electric current and voltage, be convenient to calculate harmonic wave, tri-phase unbalance factor, and Measurement accuracy mains frequency.The overall hardware configuration of terminal installation comprises DSP minimum system, power-supply system, signal detection device CT, PT and signal conditioning circuit, backup battery, electrical source exchange and house dog, real-time clock and data storage (RTC and FRAM), local debug serial port, CAN bus interface etc.; Fig. 2 is the intelligent metering terminal logic block diagram based on intelligent substation metering system, as shown in Figure 2: first voltage transformer/Current Transformer Secondary side signal isolates again through high precision small instrument transformer, and be converted to weak electric signal, then through entering AD converter after low-pass filtering.AD adopts the special-purpose six passage 16bit AD converter of electric energy metrical, sample frequency 8K SPS, built-in frequency overlapped-resistable filter and can weave into amplifier (PGA).
CAN bus interface is realized jointly by CAN controller on DSP sheet and CAN bus transceiver, supports CAN2.0B agreement, and transmission rate reaches as high as 1Mbps.
Physical end device divides three modules: power supply and instrument transformer module (PIO), core main control module (CORE), panel indicating module.
Power transformer module PIO has two functions: power conversion, measuring-signal conversion.Power conversion is transformed to 5V DC power supply by outside direct current or AC power, and measuring-signal translation circuit is small-sized measuring voltage instrument transformer, the current transformer of high accuracy high linearity, outside forceful electric power signal is converted to mA level weak electric signal, and the system of being convenient to is further processed measurement.
Core main control module CORE comprises that all major functions of system such as DSP minimum system, linear voltage decreasing voltage stabilizing, signal condition, AD conversion, CAN transceiver, clock and data storages (RTC and FRAM) realize circuit.
Panel indicating module is mainly used in indication mechanism power supply status, system running state, data communication state, active energy pulse, reactive energy pulse, and the ports such as program is downloaded, debugging, communication verification are provided simultaneously.
Power-supply system 37 is electric current, voltage conversion circuit and interface protective circuit, and power conversion adopts wide region Switching Power Supply, the compatible 85～265V AC of input and 100～300V DC, output voltage 5V, maximum output current 2A.Power conversion input circuit safety electric capacity (X electric capacity and Y electric capacity) in parallel, series connection common mode inductance are to reduce common mode High-frequency Interference;
Signal conditioning circuit 35 is electric current, voltage conversion circuit, adopt the small-size voltage transformer summation current transformer of the special-purpose high linearity of metering, instrument transformer is converted to weak electric signal by forceful electric power signal on the one hand, reaches on the other hand the inner object of isolating with external system of device.
Master controller 31 is the control core of intelligent metering terminal 3, the minimum system consisting of DSP and data storage is calculating and the control core of whole terminal, terminal adopts the high-performance 32 processor TMS320F2812 of TI company, and configuring 256K * 16bit SRAM, 4M * 16bit FLASH is construction system core together.SRAM is temporary for program operation process data, and FLASH has non-volatile feature, be applicable to save historical data and statistics, and system parameters is stored in the ferroelectric RAM (FRAM) of a slice SPI interface.For improving level of integrated system, FRAM selects the multi-functional FRAM chip FM33256 with real-time clock (RTC), Fig. 3 is the circuit theory diagrams of FM33256, as shown in Figure 3, real-time clock is with backup battery and dynamic power supplies commutation circuit, when system power failure, can be switched to immediately powered battery.
The system core also comprises that an operation monitoring circuit TPS3606 (house dog) is to improve the reliability of whole system, and operation monitoring circuit can effectively prevent program exception and the deadlock during dsp operation.
Signal conditioning circuit 35 is input signal conditioning circuit, first the mA level weak current signal being obtained by electric current, voltage conversion circuit is converted to voltage signal with accurate sample resistance, then through RC low-pass filtering, further reduce High-frequency Interference and promote signal to noise ratio, finally by input AD converter after reference voltage biasing.Six groups of weak current signals that three-phase current and three-phase voltage conversion produce adopt identical pre-process circuit, and principle as shown in Figure 4.
Sample circuit is selected six passage 16-bit sigma-delta AD converter AD73360L of ADI company three phase metering special use, sample frequency 8kSPS.Each input channel of this chip all has oneself independently signal condition, programmable amplifier (PGA) and sigma-delta AD conversion, is suitable as very much professional electric energy metrical and gathers front end, and its inside function block diagram as shown in Figure 5.
It is difference or single-ended input pattern that signal condition allows input configuration, and all signals on sheet more than integrated frequency overlapped-resistable filter (Anti-alias) filtering 4kHz, have avoided frequency alias problem completely for the 8kHz sampling of system.The function of the software configuration multiplication factor that on sheet, PGA supports has greatly been simplified external signal modulate circuit.
Metering system needs the ADC of high-resolution, high integration high s/n ratio and low price, novel sigma-delta switch technology can meet these requirements just, simulation part in sigma-delta-converter is simple (being similar to a 1bit ADC) very, and numerical portion is more complex, according to function, can be divided into digital filtering and extracting unit, so closer to a digital device.The operation principle of sigma-delta-converter is based on oversampling technique, if to sampling with frequency f s after input signal, according to Nyquist theorem, sample frequency at least doubles input signal, from fft analysis result, can see, quantizing noise is to be distributed in DC to the random noise between fs/2, is mainly because limited ADC resolution causes.In order to improve SNR and playback input signal more accurately, a kind of mode is the figure place that increases ADC, and the another kind of mode oversampling technique that to be sigma-delta-converter adopt.If sample frequency is improved to an over-sampling coefficient k, sample frequency is kfs, and fft analysis display noise baseline has reduced, and SNR value does not become, but noise energy is distributed to a wider frequency range.Sigma-delta-converter has utilized this principle just, and concrete grammar is and then after 1bit ADC, to carry out digital filtering.Most of noise is filtered by digital filter, and like this, RMS noise has just reduced, thereby by a low resolution A/D C, sigma-delta-converter has obtained wide dynamic range.Extracting unit after digital filtering (decimator), its extraction yield is determined by over-sampling rate and ADC output sample speed.Extracting unit is also kept in the 1bit AD Output rusults internal RAM that the sample value that obtains is stored in AD73360L that add up by AD output figure place; Fig. 5 is three-phase current, voltage signal conditioning and sample circuit schematic diagram.
AD73360L and dsp interface are synchronous serial interface, and Fig. 6 has represented interface circuit schematic diagram.On F2812 sheet, McBSP interface configuration is very flexible, can with seamless coupling of synchronous serial interface sequential of AD73360L, its sequential chart is as shown in Figure 6.Voltage-reference adopts REF3212, and for AD provides the conversion reference voltage of 1.25V, AD needs outside input clock source (frequency 16.384MHz) simultaneously.
Fig. 7 is AD73360L and dsp interface circuit diagram.
Fig. 8 is AD73360L synchronous serial interface communication succession figure.
Described CAN transceiver 36 is mainly completed by CAN controller for CAN bus communication protocol data link layer protocol, the inner integrated CAN controller of supporting CAN2.0B agreement of TMS320F2812, physical layer realizes by SN65HVD230D transceiver, and transmission rate reaches as high as 1Mbps.By AD μ M1201 magnetic isolating chip, realize the electrical isolation of built-in system and external bus with outside, circuit as shown in Figure 9.
Intelligent metering terminal 3 also comprises LED light, serial communication port, local debugging interface 39; The indication mechanism power supplys such as LED light, operation, communications status and active energy pulse output, reactive energy pulse output etc.Serial communication port is for the inline diagnosis of device, and local debugging interface 39 is JTAG debugging interface, is the main debugging interface of development.
The course of work of the present invention is as follows, signal detection device CT, the output signal of PT is delivered in AD converter after signal condition, master cpu is controlled acquisition length, acquisition time and the sample rate of voltage, current signal, the time of exporting according to clock circuit is stamped time tag by the data that collect, and by CAN bus, the data of collection is sent to master station.Power-supply system is all circuit chip power supplies, and backup battery is house dog and clock circuit power supply, and the operating state of watchdog module current events monitoring CPU, once CPU operation irregularity is restarted CPU in time.The present invention can monitor the energy situation of transformer station's circuit as required in real time.
Claims (2)
1. the intelligent metering terminal based on intelligent substation metering system, is characterized in that: described intelligent metering terminal (3) comprising: master controller (31), clock and memory circuit (32), electrical source exchange and house dog (33), AD converter (34), signal conditioning circuit (35), CAN transceiver (36), power-supply system (37), backup battery (38) and local debugging interface (39); Wherein: master controller (31) is connected with house dog (33), AD converter (34), CAN transceiver (36) and local debugging interface (39) with clock and memory circuit (32), electrical source exchange respectively; Electrical source exchange is connected with clock and memory circuit (32) with house dog (33), backup battery (38) is connected with clock and memory circuit (32), AD converter (34) is connected with signal detection device by signal conditioning circuit (35), CAN transceiver (36) is connected with CAN bus communication network (2), and power-supply system (37) is connected with house dog (33), AD converter (34) and signal conditioning circuit (35) with master controller (31), electrical source exchange respectively.
2. the intelligent metering terminal based on intelligent substation metering system according to claim 1, it is characterized in that: described CAN bus communication network (2) is serial communication network, it is comprised of communicate by letter twisted-pair feeder and 3 core power lines, it is laid in cable testing bridge, and intelligent metering terminal (3) is connected with bus mode with collective analysis unit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420249210.XU CN203911585U (en) | 2014-05-15 | 2014-05-15 | Intelligent metering terminal based on transformer substation intelligent metering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420249210.XU CN203911585U (en) | 2014-05-15 | 2014-05-15 | Intelligent metering terminal based on transformer substation intelligent metering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203911585U true CN203911585U (en) | 2014-10-29 |
Family
ID=51785831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420249210.XU Active CN203911585U (en) | 2014-05-15 | 2014-05-15 | Intelligent metering terminal based on transformer substation intelligent metering system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203911585U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007137A (en) * | 2019-05-06 | 2019-07-12 | 国网四川省电力公司电力科学研究院 | A kind of intelligent electric energy meter merging multiple terminal monitoring function |
-
2014
- 2014-05-15 CN CN201420249210.XU patent/CN203911585U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007137A (en) * | 2019-05-06 | 2019-07-12 | 国网四川省电力公司电力科学研究院 | A kind of intelligent electric energy meter merging multiple terminal monitoring function |
| CN110007137B (en) * | 2019-05-06 | 2022-02-01 | 国网四川省电力公司电力科学研究院 | Intelligent electric energy meter integrating multiple terminal monitoring functions |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201742158U (en) | Online monitoring device for power transformer | |
| CN102749549B (en) | A kind of transformer station AC current-voltage secondary circuit Smart Verify system | |
| CN202770913U (en) | Transformer sleeve dielectric loss on-line monitoring device | |
| CN202870226U (en) | Electric energy quality analyzer | |
| CN201368905Y (en) | Power quality monitoring and recording device of power system | |
| CN202093092U (en) | All-round power metering chip | |
| CN102435838A (en) | Basic electric quantity type energy-efficiency data collecting terminal | |
| CN103986231A (en) | Networked intelligent transformer substation metering system | |
| CN201289499Y (en) | Low-voltage carrier concentrator terminal and intercommunion sampling unit thereof | |
| CN201796082U (en) | Intelligent device for measuring current, voltage and power | |
| CN103454552A (en) | Transformer winding deformation on-line monitoring chip | |
| CN102436733A (en) | Thermotechnical electric quantity type energy efficiency data collecting terminal | |
| CN203204080U (en) | Bushing dielectric loss on-line monitoring device based on B code timing | |
| CN203911585U (en) | Intelligent metering terminal based on transformer substation intelligent metering system | |
| CN202351348U (en) | Intelligent monitoring instrument of transformer | |
| CN202494744U (en) | Device for detecting quality of electric energy | |
| TWI461710B (en) | Power Quality Analyzer System | |
| CN208672718U (en) | Power quality analysis device based on short-distance wireless communication technology | |
| Yang et al. | The design of smart meter with power quality monitoring | |
| CN202373130U (en) | Thermal electric quantity type energy efficiency data acquisition terminal | |
| CN202872459U (en) | Intelligent distribution terminal telemetry board | |
| CN205176133U (en) | Electric energy meter based on SOC measures chip | |
| CN203929932U (en) | A kind of transformer capacity tester based on ATT7022B | |
| CN202421324U (en) | Basic electric quantity type efficiency data acquisition terminal | |
| CN208109927U (en) | A kind of electrical equipment malfunction data logging plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |