CN207491146U - A kind of distribution terminal communication system - Google Patents
A kind of distribution terminal communication system Download PDFInfo
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- CN207491146U CN207491146U CN201721459667.3U CN201721459667U CN207491146U CN 207491146 U CN207491146 U CN 207491146U CN 201721459667 U CN201721459667 U CN 201721459667U CN 207491146 U CN207491146 U CN 207491146U
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- 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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- 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
- Y04S40/126—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 wireless data transmission
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The utility model discloses a kind of distribution terminal communication systems,It is related to power distribution network communication technique field,It is used in wireless telecommunications for existing power distribution network and transmits power consumption,Transmission rate,Transmitted data amount and transmission range, which are unable to good match and majority, to be needed to rely on the technical issues of infrastructure offer communication support causes construction cost high,Using including data acquisition device,Data concentrator,Network server and monitor terminal,The data acquisition device is wirelessly connect with data concentrator,The data concentrator is connect by network with network server,The technical solution that the network server is connect with monitor terminal solves the problems, such as,The utility model is used based on the exclusive low energy consumption of LoRa technologies,Long transmission distance,The features such as being supported without base station,By from solar energy,Wind energy,Voltage transformer and site inspection equipment obtain the energy and adjust automatically operating mode is to adapt to energy consumption,So as to long-term,Efficiently ensure the connection of power distribution network communication.
Description
Technical field
The utility model is related to power distribution network communication technique field, more particularly to a kind of distribution terminal communication system.
Background technology
Power distribution automation is the concept of the western developed country proposition seventies, has been obtained fully in Japan, America and Europe at present
Development.The country is concentrated mainly on city there has also been many trials.Power distribution automation is by power distribution network in normal and accident situation
Under monitoring, protection, control, metering and the work management of power supply department be organically merged, improve power supply quality, with
More closely more responsible relationship is established at family, and the diversity of user's requirement is met with reasonable prices, it is best to make every effort to power supply economics.
At present, most of distribution automation systems can also play monitoring distribution network operation shape in power distribution network normal operation
Condition and remote control change the effect of the method for operation, and when failure can be discovered in time, and still, the power distribution automation of electric system at present is main
It is also to rely on public network to take remote measurement the uplink of data, in remote suburb, since the network of public network is poor, even without public affairs
Net signal, the telemetry of such power distribution automation cannot upload to main website, this is that distribution power automation terminal is in unsupervised shape
State, even if the job information of distribution line cannot be understood.
For the place of no public network or public network signal difference, there are three types of solution is general, be respectively wireless self-networking,
Microwave station, optical fiber.In power scheduling field, since the requirement of real-time, reliability, safety is high, generally using microwave station and
Optical fiber, but both modes belong to the high cost of high investment.In distribution automation field, real-time, reliability, safety will
Ask relatively lower, the node of power distribution automation is very more, very sensitive to cost, therefore wireless communication mode is received and generally should
With.
The mode of wireless hoc network has WIFI, bluetooth, GPRS, 3G, 4G at present, and WIFI transmission rates are high, but transmits
Apart from short, power consumption height；Still transmission range is very short for the more high and low power consumption of bluetooth transmission speed；GPRS coverage areas still need greatly
Rely on infrastructure construction；3G, 4G transmission rate are high, but are also relied on infrastructure construction and intensive base station is needed to support.
The wireless technology of composition LAN mainly has the WiFi of 2.4GHz, bluetooth, Zigbee etc., forms the wireless of wide area network
Technology mainly has 2G/3G/4G etc..These wireless technologys, advantage and disadvantage clearly, in low-power consumption wide area network（Low Power
Wide Area Network, LPWAN）Before generation, it appears that remote and low-power consumption between the two can only alternative；Work as use
After LPWAN technologies, designer can accomplish both to take into account, and farthest realize more long haul communication and more low-power consumption,
It can also save additional repeater cost simultaneously.
LoRa is one kind in the LPWAN communication technologys, is that one kind that Semtech companies of the U.S. use and promote is based on expanding
The overlength distance wireless transmission scheme of frequency technology.This scheme changes the compromise consideration side about transmission range and power consumption in the past
Formula provides a kind of simple energy to the user and realizes remote, long battery life, large capacity system, and then extend sensing network.
At present, LoRa is mainly run in global free frequency range, including 433,868,915 MHz etc..LoRa technologies have remote, low
Power consumption（Battery life is long）, multinode, low cost characteristic.
Utility model content
The utility model provides a kind of distribution terminal communication system, to solve existing power distribution network using being passed in wireless telecommunications
Defeated power consumption, transmission rate, transmitted data amount and transmission range, which are unable to good match and majority, needs dependence infrastructure to carry
The technical issues of causing construction cost high for communication support.
It is realized to solve the above problems, the utility model adopts the following technical solution：
A kind of distribution terminal communication system, including data acquisition device, data concentrator, network server and monitoring eventually
End, the data acquisition device are wirelessly connect with data concentrator, and the data concentrator passes through network and network
Server connects, and the network server is connect with monitor terminal；
The data acquisition device includes at least 1；
The data acquisition device includes LoRa terminal main control modules, parameter input control module, data acquisition interface mould
Block, electricity-fetching module, data transmit-receive module, LoRa terminal main control modules first interface are connect with the parameter input control module,
LoRa terminal main control modules second interface is connect with the data acquisition interface module, LoRa terminal main control module third interfaces
It is connect with the electricity-fetching module, the 4th interface of LoRa terminal main control modules is connect with data transmit-receive module；
The LoRa terminal main control modules include microcomputer controller, LoRa wireless transmission units, the LoRa terminals master
Control module is used to receive the information that the data acquisition interface module transmission comes and be processed, and then passes through data transmit-receive module
It is sent to data concentrator；
The parameter input control module includes push-button unit, display unit, and parameter input control module is used for described
LoRa terminal main control modules input control instructs；
The data acquisition interface module is used to connect with the various detection devices at scene and obtains detection data；
The data transmit-receive module includes transmitting antenna, for data to be given by radio wave transmission in the data set
Device；
The electricity-fetching module includes mutual inductor unit, lightning protection isolation filter unit, the first rectification stable pressuring unit, channel switching
Unit, solar cell panel unit, the second rectification unit, wind-driven generator unit, lightning protection unit and rectifying and wave-filtering voltage stabilizing list
Member, the mutual inductor unit are connect with lightning protection isolation filter unit end of incoming cables, lightning protection isolation filter unit leading-out terminal and first whole
The connection of voltage regulation unit end of incoming cables is flowed, the first rectification stable pressuring unit leading-out terminal is connect with channel switch unit second interface；It is described too
Positive energy battery plate unit is connect with the second rectification unit end of incoming cables, and the second rectification unit leading-out terminal connects with channel switch unit third
Mouth connection；Wind-driven generator unit is connect with lightning protection unit end of incoming cables, lightning protection unit leading-out terminal and rectifying and wave-filtering voltage regulation unit into
Line end connects, and rectifying and wave-filtering voltage regulation unit leading-out terminal is connect with the 4th interface of channel switch unit；Channel switch unit first connects
With LoRa terminal main control module third interfaces；
The channel switch unit includes peak-to-peak value detection unit, IGBT conduction pipes, for detecting and switching and LoRa ends
Hold the electric power loop of main control module connection；
The wireless mode is LoRa wireless transmission methods.
Preferably, the network is Ethernet or 3G, 4G network.
Preferably, the data acquisition interface module is transmitted using 485 agreements.
Preferably, the mutual inductor unit is made of at least one voltage transformer, for being obtained from detected circuit
Electric energy is simultaneously supplied to data acquisition device；
The lightning protection isolation filter unit includes lightning protection device, filter capacitor, and lightning protection isolation filter unit is used for mutual inductor list
The electricity that member is sent carries out lightning protection and filtering process；
Preferably, solar cell panel unit is mainly made of solar panel.
Preferably, the data concentrator includes data transmit-receive module, is sent for receiving the data acquisition device
Data and data are sent to network server by network.
The utility model is used based on the exclusive low energy consumption of LoRa technologies, transmission range member without spies such as base station supports
Point, by obtaining the energy and adjust automatically operating mode from solar energy, wind energy, voltage transformer and site inspection equipment to fit
It should be able to consume, so as to long-term, the efficient connection for ensureing power distribution network communication.
Description of the drawings
Fig. 1 is embodiment overall structure block diagram provided by the utility model；
Fig. 2 is data acquisition device structure diagram in embodiment provided by the utility model；
Fig. 3 is the structure diagram of electricity-fetching module in embodiment provided by the utility model.
Specific embodiment
To make the purpose of this utility model, technical solution and advantage clearer, implement below in conjunction with the utility model
Fig. 1-3 in example, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described reality
It is the utility model part of the embodiment to apply example, instead of all the embodiments.Usually it is described and illustrated herein in the accompanying drawings
The detailed description of the embodiment of the utility model is not intended to limit claimed the scope of the utility model, but only table
Show the selected embodiment of the utility model.Based on the embodiment in the utility model, those of ordinary skill in the art are not doing
Go out all other embodiments obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Fig. 1 is embodiment overall structure block diagram provided by the utility model, and Fig. 2 is in embodiment provided by the utility model
Data acquisition device structure diagram, Fig. 3 are the structure diagrams of electricity-fetching module in embodiment provided by the utility model, such as Fig. 1-3
It is shown, a kind of distribution terminal communication system, including data acquisition device, data concentrator, network server and monitor terminal, number
It is connect according to harvester by LoRa wireless transmission methods with data concentrator, data concentrator passes through Ethernet or 3G, 4G net
Network is connect with network server, and network server is connect with monitor terminal；
Data acquisition device includes at least 1, and the present embodiment uses 4, respectively with for acquiring overhead transmission line three-phase electricity
The device connection of stream, voltage；
Data acquisition device includes LoRa terminal main control modules, parameter input control module, data acquisition interface module, takes
Electric module, data transmit-receive module, LoRa terminal main control modules first interface are connect with parameter input control module, LoRa terminals
Main control module second interface is connect with data acquisition interface module, and LoRa terminal main control module third interfaces connect with electricity-fetching module
It connects, the 4th interface of LoRa terminal main control modules is connect with data transmit-receive module；
LoRa terminal main control modules include microcomputer controller, LoRa wireless transmission units, and LoRa terminal main control modules are used
In receiving the next information of data acquisition interface module transmission and being processed, data set is then sent to by data transmit-receive module
Middle device；
Parameter input control module includes push-button unit, display unit, and parameter input control module is used for LoRa terminals
Main control module input control instructs；
Data acquisition interface module is transmitted using 485 agreements, and including but not limited to FTU, RTU, TTU agreement connect, and are used for
It is connect with the various detection devices at scene and obtains detection data；
Data transmit-receive module include transmitting antenna, for by data by radio wave transmission to data concentrator；
Electricity-fetching module includes mutual inductor unit, lightning protection isolation filter unit, the first rectification stable pressuring unit, channel switching list
Member, solar cell panel unit, the second rectification unit, wind-driven generator unit, lightning protection unit and rectifying and wave-filtering voltage regulation unit,
Mutual inductor unit is connect with lightning protection isolation filter unit end of incoming cables, lightning protection isolation filter unit leading-out terminal and the first rectifying and voltage-stabilizing list
First end of incoming cables connection, the first rectification stable pressuring unit leading-out terminal are connect with channel switch unit second interface；Solar panel list
Member is connect with the second rectification unit end of incoming cables, and the second rectification unit leading-out terminal is connect with channel switch unit third interface；Wind energy
Generator unit is connect with lightning protection unit end of incoming cables, and lightning protection unit leading-out terminal is connect with rectifying and wave-filtering voltage regulation unit end of incoming cables, whole
Stream filtering voltage regulation unit leading-out terminal is connect with the 4th interface of channel switch unit；Channel switch unit first connects and LoRa terminal masters
Control module third interface；
Channel switch unit includes peak-to-peak value detection unit, IGBT conduction pipes, for detecting and switching and LoRa terminal masters
Control the electric power loop of module connection；
Wherein,
Mutual inductor unit is made of at least one voltage transformer, for obtaining electric energy from detected circuit and being supplied to
Data acquisition device；
Lightning protection isolation filter unit includes lightning protection device, filter capacitor, and lightning protection isolation filter unit send for mutual inductor unit
The electricity come carries out lightning protection and filtering process；
Solar cell panel unit is mainly made of solar panel；
Data concentrator includes data transmit-receive module, for receiving data that data acquisition device sends and leading to data
It crosses network and is sent to network server.
Electricity-fetching module mainly takes from circuit and supplies electricity to middle control module for power supply, and electricity getting device takes power mode there are three types of inside,
One is to take electricity from data acquisition interface module, second is that taking electricity from voltage transformer and solar cell, third is from wind-force
Generator takes electricity.When circuit does not set up voltage transformer or is inconvenient to install voltage transformer, electricity-fetching module is just from too
Positive energy battery or wind-driven generator take electricity.If meet continuous prolonged rainy weather or solar panel damage,
Just take electricity from wind-driven generator or data acquisition interface module, at the same to main control module send it is current take power mode signal,
At this time due to taking the power of electricity smaller, main control module is worked with low-power consumption mode, reduces primary processor internal bus clock frequency
Rate, intermittence are turned on and off the peripheral hardware that main control module internal processor seldom works, and increase communication time interval, set Lora
Terminal main control module reduces signal transmission power, while increases the proportion of redundant code, so as to ensure that system is realizing basic function
In the case of, power consumption is no more than the supply capacity for currently taking power mode.When there is voltage transformer in outside, electricity-fetching module is used
Electricity is taken from voltage transformer, at this time stronger to the power supply capacity of master control mould electricity, main control module can use peak performance pattern work
Make, the information of circuit acquisition interface is carried out to more dense, faster upload.
Electricity-fetching module is under voltage transformer work to take power situation, by voltage transformer, lightning protection isolation filter module, whole
Voltage stabilizing module composition is flowed, electricity-fetching module is connected under data acquisition interface work to take power situation by peak-to-peak value detection unit, IGBT
Pipe, automatic threshold setting module, rectifying and voltage-stabilizing module composition.Wherein peak-to-peak value detection unit is electric for detecting circuit acquisition interface
Voltage crest peak value, automatic threshold setup module set a threshold value automatically according to the size of peak-to-peak value, when more than this threshold value, hair
Go out drive signal control IGBT pipe conductings, the electric flux of such data acquisition interface can flow out, and enter arrangement stable-pressure device
Electric energy is exported to main control module.Dependent on peak-to-peak value detection module and automatic threshold control module so that only acquired in data
Just carry out taking electrically operated during the logic voltage that the voltage of interface can be identified higher than main control module, so as to take electricity when can't count
According to acquisition interface and the normal work of main control module.
In order to ensure data transmission efficiently and accurately, data acquisition device will before data to be transmitted to data concentrator
It is as follows to modulate method used by modulating for signal：1st, the sine wave of a frequency is produced；2nd, according to parameter input module
Code check parameter sets the transformation range of sine wave, and if code check control is set as 125KHz, then the transformation range of sine wave is exactly
125KHz, if code check control is set as 250KHz, then the transformation range of sine wave is exactly 250KHz, as code check control is set as
500KHz, then the transformation range of sine wave is exactly 500KHz；3rd, the frequency changing rule of sine wave according to input data difference
And different, including but not limited to once transform method：When data are 1, sine wave changes from low frequency toward high-frequency, works as data
When being 0, sine wave is from high-frequency toward low frequency change；Or when data are 0, sine wave changes from low frequency toward high-frequency,
When data are 1, sine wave is from high-frequency toward low frequency change；Or when data are 1, the frequency of sine wave, which first increases, to be become
Low, when data are 0, the frequency of sine wave, which is first lower, to be increased；Or when data are 0, the frequency of sine wave first increases
It is lower, when data are 1, the frequency of sine wave, which is first lower, to be increased；Or when data are 1, sine wave freuqency is in maximum
It is converted in the range of setting, when data are 0, sine wave is in the half transformation of maximum setting range；Or when data are 0, just
String wave frequency rate converts in the range of maximum setting, and when data are 1, sine wave is in the half transformation of maximum setting range.
The utility model is used based on the exclusive low energy consumption of LoRa technologies, transmission range member without spies such as base station supports
Point, by obtaining the energy and adjust automatically operating mode from solar energy, wind energy, voltage transformer and site inspection equipment to fit
It should be able to consume, so as to long-term, the efficient connection for ensureing power distribution network communication.
Claims (6)
1. a kind of distribution terminal communication system, it is characterised in that：
Including data acquisition device, data concentrator, network server and monitor terminal, the data acquisition device passes through wireless
Mode is connect with data concentrator, and the data concentrator is connect by network with network server, the network server with
Monitor terminal connects；
The data acquisition device includes at least 1；
The data acquisition device includes LoRa terminal main control modules, parameter input control module, data acquisition interface module, takes
Electric module, data transmit-receive module, LoRa terminal main control modules first interface are connect with the parameter input control module, LoRa
Terminal main control module second interface is connect with the data acquisition interface module, LoRa terminal main control module third interfaces and institute
Electricity-fetching module connection is stated, the 4th interface of LoRa terminal main control modules is connect with data transmit-receive module；
The LoRa terminal main control modules include microcomputer controller, LoRa wireless transmission units, the LoRa terminals master control mould
Block is used to receive the information that the data acquisition interface module transmission comes and be processed, and is then sent by data transmit-receive module
To data concentrator；
The parameter input control module includes push-button unit, display unit, and parameter input control module is used for the LoRa
Terminal main control module input control instructs；
The data acquisition interface module is used to connect with the various detection devices at scene and obtains detection data；
The data transmit-receive module includes transmitting antenna, for giving data to the data concentrator by radio wave transmission；
The electricity-fetching module includes mutual inductor unit, lightning protection isolation filter unit, the first rectification stable pressuring unit, channel switching list
Member, solar cell panel unit, the second rectification unit, wind-driven generator unit, lightning protection unit and rectifying and wave-filtering voltage regulation unit,
The mutual inductor unit is connect with lightning protection isolation filter unit end of incoming cables, and lightning protection isolation filter unit leading-out terminal and the first rectification are steady
The connection of unit end of incoming cables is pressed, the first rectification stable pressuring unit leading-out terminal is connect with channel switch unit second interface；The solar energy
Battery plate unit is connect with the second rectification unit end of incoming cables, and the second rectification unit leading-out terminal connects with channel switch unit third interface
It connects；Wind-driven generator unit is connect with lightning protection unit end of incoming cables, lightning protection unit leading-out terminal and rectifying and wave-filtering voltage regulation unit end of incoming cables
Connection, rectifying and wave-filtering voltage regulation unit leading-out terminal are connect with the 4th interface of channel switch unit；Channel switch unit first connect with
LoRa terminal main control module third interfaces；
The channel switch unit includes peak-to-peak value detection unit, IGBT conduction pipes, for detecting and switching and LoRa terminal masters
Control the electric power loop of module connection；
The wireless mode is LoRa wireless transmission methods.
2. distribution terminal communication system according to claim 1, it is characterised in that：
The network is Ethernet or 3G, 4G network.
3. distribution terminal communication system according to claim 1, it is characterised in that：
The data acquisition interface module is transmitted using 485 agreements.
4. distribution terminal communication system according to claim 1, it is characterised in that：
The mutual inductor unit is made of at least one voltage transformer, for obtaining electric energy from detected circuit and being supplied to
Data acquisition device；
The lightning protection isolation filter unit includes lightning protection device, filter capacitor, and lightning protection isolation filter unit send for mutual inductor unit
The electricity come carries out lightning protection and filtering process.
5. distribution terminal communication system according to claim 1, it is characterised in that：
Solar cell panel unit is mainly made of solar panel.
6. distribution terminal communication system according to claim 1, it is characterised in that：
The data concentrator includes data transmit-receive module, for receiving data that the data acquisition device sends and by number
Network server is sent to according to by network.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721459667.3U CN207491146U (en) | 2017-11-06 | 2017-11-06 | A kind of distribution terminal communication system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721459667.3U CN207491146U (en) | 2017-11-06 | 2017-11-06 | A kind of distribution terminal communication system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108961719A (en) * | 2018-08-21 | 2018-12-07 | 成都理工大学 | A kind of high altitude regions rescue system based on Intelligent bracelet |
| CN109450092A (en) * | 2018-11-21 | 2019-03-08 | 宁波恒晨电力建设有限公司 | Power distribution network overload early-warning monitoring system |
| CN110165780A (en) * | 2019-05-24 | 2019-08-23 | 中国电力科学研究院有限公司 | Electric parameter monitoring device, monitor terminal for low-pressure side power grid |
-
2017
- 2017-11-06 CN CN201721459667.3U patent/CN207491146U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108961719A (en) * | 2018-08-21 | 2018-12-07 | 成都理工大学 | A kind of high altitude regions rescue system based on Intelligent bracelet |
| CN109450092A (en) * | 2018-11-21 | 2019-03-08 | 宁波恒晨电力建设有限公司 | Power distribution network overload early-warning monitoring system |
| CN110165780A (en) * | 2019-05-24 | 2019-08-23 | 中国电力科学研究院有限公司 | Electric parameter monitoring device, monitor terminal for low-pressure side power grid |
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