CN209069331U - A kind of power distribution room operational system based on Internet of Things - Google Patents

A kind of power distribution room operational system based on Internet of Things Download PDF

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Publication number
CN209069331U
CN209069331U CN201821772458.9U CN201821772458U CN209069331U CN 209069331 U CN209069331 U CN 209069331U CN 201821772458 U CN201821772458 U CN 201821772458U CN 209069331 U CN209069331 U CN 209069331U
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CN
China
Prior art keywords
power distribution
module
distribution room
cable
operational system
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Expired - Fee Related
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CN201821772458.9U
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Chinese (zh)
Inventor
王建文
杨志亮
袁战刚
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Shenzhen Jinbolian Electric Power Technology Co Ltd
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Shenzhen Jinbolian Electric Power Technology Co Ltd
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Priority to CN201821772458.9U priority Critical patent/CN209069331U/en
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Publication of CN209069331U publication Critical patent/CN209069331U/en
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Abstract

The utility model relates to power distribution room O&M technical fields, and in particular to a kind of power distribution room operational system based on Internet of Things, including the electrical detection module for detection cable or copper bar Current Voltage;For detection cable or the temperature detecting module of copper bar temperature;Concentrator module connect with electrical detection module and temperature detecting module respectively and receives analysis processing current and voltage data and temperature data;Communication gate equipment connect with concentrator module and receives concentrator module analysis treated data and repacked;Server connect with communication gate equipment and receives the data after repacking;User terminal connect the data for receiving communication gate equipment with server.The current and voltage data that electrical detection module obtains and the temperature data that temperature detecting module obtains are focused on by the way that concentrator module is arranged, and user terminal is eventually sent to by communication gate equipment, it realizes power distribution room real-time monitoring and digital management, improves efficiency, reduce maintenance and cost.

Description

A kind of power distribution room operational system based on Internet of Things
Technical field
The utility model relates to power distribution room O&M technical fields, and in particular to a kind of power distribution room O&M system based on Internet of Things System.
Background technique
Power distribution room is the electrical equipment place that electric energy is transmitted, distributed in the power distribution network of electric system end, is urban power distribution network Important component.The final link that power distribution room is powered as user oriented is the key factor for influencing power supply reliability.Match Electric room number of devices is huge, and the ability of operation and maintenance determines the operation level of entire power distribution network.Urban public power distribution room Unattended way to manage is generally used, but since quantity is more, development is fast, and most power distribution rooms is not carried out effectively No worker monitor management.
Currently, most cities power distribution room only realizes the electrical power distribution automatization system of high-voltage switch gear.In longtime running In the process, power distribution room due to environmental condition it is poor, running current is big, radiates bad, and controller switching equipment is because insulation ag(e)ing is leaked electricity, or because connecing Electric shock resistance is excessive to there is superheating phenomenon, and the service life for influencing equipment even results in fire, causes large-area power-cuts, directly affects The reliability service in entire platform area.Therefore, power supply company needs periodically to carry out inspection to power distribution room equipment, and to chief position Inlet-outlet line surface temperature measures.It is existing to use personal monitoring's means more inefficient power distribution room equipment, daily O&M ten Divide difficulty;As the construction with electricity consumption facility is more and more, maintenance is increasing, and human cost is high.
Utility model content
The technical problem to be solved by the present invention is in view of the above drawbacks of the prior art, provide a kind of based on object The power distribution room operational system of networking overcomes existing power distribution room equipment monitoring inefficient, and daily O&M is difficult, and maintenance is big, manpower Problem at high cost.
The technical scheme adopted by the utility model to solve the technical problem is as follows: providing a kind of power distribution room based on Internet of Things Operational system, for power distribution room power distribution cabinet and controller switching equipment carry out operation management, the power distribution room operational system includes:
For detecting the electrical detection module of the Current Voltage of controller switching equipment cable or copper bar;
For detecting the temperature detecting module of the temperature of controller switching equipment cable or copper bar;
Concentrator module, connect with electrical detection module and temperature detecting module respectively and reception and analysis processing is electrically examined Survey the current and voltage data that module obtains and the temperature data that temperature detecting module obtains;
Communication gate equipment connect and is received with concentrator module concentrator module analysis treated data and carries out weight It is new to be packaged;
Server connect with communication gate equipment and receives the data after communication gate equipment is repacked;
User terminal connect the data for receiving communication gate equipment with server.
The still more preferably scheme of the utility model is: the concentrator module includes processor unit, respectively with electricity The first wireless transmission unit that gas detection module, temperature detecting module and processor unit connect, and respectively with processor list The second wireless transmission unit that member is connected with communication gate equipment, the electric current that the processor unit obtains electrical detection module The temperature data that voltage data and temperature detecting module obtain is transmitted to after being analyzed and processed by the second wireless transmission unit Communication gate equipment.
The still more preferably scheme of the utility model is: the power distribution room operational system further includes power distribution cabinet, Yi Jiyu Power distribution cabinet connection cable, the cable include the main cable being connect with outside line and respectively with main cable and distribution The a plurality of branch cable of cabinet connection, is arranged with that connect and be used to detect branch with concentrator module electric on each branch cable The running state detecting device of cable operating status.
The still more preferably scheme of the utility model is: the power distribution cabinet include multiple electric connection parts and with electrically connect The mounting portion of socket part connection, the branch cable are connect with electric connection part, and the concentrator module is set in mounting portion.
The still more preferably scheme of the utility model is: the electrical detection module includes for detecting controller switching equipment electricity The voltage sensor of cable or copper bar voltage and current sensor for detecting controller switching equipment cable or copper bar electric current.
The still more preferably scheme of the utility model is: the communication gate equipment includes lightning protection power source and thunder-lightning The gateway main body of source connection and the gateway antennas being connect respectively with gateway main body, concentrator module and server.
The still more preferably scheme of the utility model is: the temperature detecting module include set on controller switching equipment cable or Temperature sensor on copper bar.
The still more preferably scheme of the utility model is: the power distribution room operational system further includes connecting with concentrator module The functional module connect, the functional module include smoke sensor device or infrared sensor.
The still more preferably scheme of the utility model is: the power distribution room operational system further includes connecting with concentrator module Connect and be used to obtain the locating module of power distribution room location information.
The still more preferably scheme of the utility model is: the locating module includes GPS positioning module or Beidou positioning Module.
The beneficial effects of the utility model are, compared with prior art, by the way that electrical detection module, temperature detection is arranged Module, and the concentrator module connecting respectively with electrical detection module and temperature detecting module, concentrator module acquisition are concentrated The distribution that the current and voltage data and temperature detecting module of controller switching equipment cable or copper bar that electrical detection module obtains obtain is set The temperature data of standby cable or copper bar, and server and user terminal are sent to by gateway, realize the reality to power distribution room When monitor, effective management of power distribution room account information, simplify power distribution room O&M operation, improve operation management efficiency, reduce maintenance Amount and human cost;And the modules of power distribution room operational system can be installed and be run when controller switching equipment charges, and be applied Work is convenient, and the feelings that the electrical detection module of power distribution room operational system, temperature detecting module can be zero in controller switching equipment electric current It is worked normally under condition.
Detailed description of the invention
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:
Fig. 1 is the planar structure schematic diagram of the power distribution room operational system of the utility model;
Fig. 2 is the planar structure schematic diagram of the communication gate equipment of the utility model;
Fig. 3 is the structural block diagram of the power distribution room operational system of the utility model;
Fig. 4 is the specific block diagram of the power distribution room operational system of the utility model;
Fig. 5 is the structural block diagram of the concentrator module of the utility model;
Fig. 6 is the structural block diagram of first wireless transmission unit of the utility model;
Fig. 7 is the structural block diagram of second wireless transmission unit of the utility model;
Fig. 8 is the structural block diagram of the electrical detection module of the utility model;
Fig. 9 is the structural block diagram of the functional module of the utility model.
Specific embodiment
Now in conjunction with attached drawing, elaborate to the preferred embodiment of the utility model.
As shown in Figures 1 to 9, the utility model provides a kind of preferred implementation of power distribution room operational system based on Internet of Things Example.
The power distribution room operational system is used to carry out operation management to the power distribution cabinet 90 and controller switching equipment of power distribution room.It is described to match Electric room operational system includes:
For detecting the electrical detection module 10 of the Current Voltage of controller switching equipment cable or copper bar;
For detecting the temperature detecting module 20 of the temperature of controller switching equipment cable or copper bar;
Concentrator module 30, connect with electrical detection module 10 and temperature detecting module 20 respectively and reception and analysis are handled The temperature data that the current and voltage data and temperature detecting module 20 that electrical detection module 10 obtains obtain;
Communication gate equipment 40 connect with concentrator module 30 and receives the analysis of concentrator module 30 treated data simultaneously It is repacked;
Server 50 connect with communication gate equipment 40 and receives the data after communication gate equipment 40 is repacked;
User terminal 60 connect the data for receiving communication gate equipment 40 with server 50.
By being arranged electrical detection module 10, temperature detecting module 20, and respectively with electrical detection module 10 and temperature The concentrator module 30 that detection module 20 connects, the controller switching equipment that the acquisition of concentrator module 30 concentrates electrical detection module 10 to obtain The temperature data of controller switching equipment cable or copper bar that the current and voltage data and temperature detecting module 20 of cable or copper bar obtains, and It is sent to server 50 and user terminal 60 by communication gate equipment 40, realizes the real-time monitoring to power distribution room, power distribution room platform The digital management of account simplifies the operation of power distribution room O&M, improves operation management efficiency, reduces maintenance and human cost.And The various operating statuses of power distribution room operational system on-line real-time measuremen route of the utility model have provided for route normal operation It tries hard to keep barrier, and provides effective information for route increase-volume, layout of roads, line security and route Suo Yuan.
Wherein, communication gate equipment 40 is a kind of computer system or equipment for serving as conversion important task, realizes two high levels The different network interconnection of agreement.Analysis treated the data of concentrator module 30 are realized by communication gate equipment 40 and carry out weight It is new be packaged transmission be it is conventional, software control part can be realized by prior art means.The utility model is based on electrical Detection module 10, temperature detecting module 20, concentrator module 30, communication gate equipment 40, server 50 and user terminal 60 Power distribution room operational system is realized to the real-time monitoring and operation management of power distribution room controller switching equipment, belongs to utility model protection Object.
As shown in figure 5, the utility model provides a kind of preferred embodiment of concentrator module.
The concentrator module 30 include processor unit 31, respectively with electrical detection module 10, temperature detecting module 20 With processor unit 31 connect the first wireless transmission unit 32, and respectively with processor unit 31 and communication gate equipment 40 Second wireless transmission unit 33 of connection, the current and voltage data that the processor unit 31 obtains electrical detection module 10 with The temperature data that temperature detecting module 20 obtains passes through the second wireless transmission unit 33 after being analyzed and processed and is transmitted to communication network Close equipment 40.
Concentrator module 30 receives centralized power distribution equipment cable by the first wireless transmission unit 32 with wireless transmission method Or copper bar current and voltage data and controller switching equipment cable or copper bar temperature data, and processor unit 31 is to Current Voltage number It is analyzed and processed according to temperature data, and communication gate equipment 40 is transmitted to by the second wireless transmission unit 33, reduced logical Believe route, improves line efficiency.
Wherein, the processor unit 31 includes: by electric current electricity to the analysis processing of current and voltage data and temperature data Press data and temperature data and preset threshold value comparison, detect current or voltage on controller switching equipment cable or copper bar whether mistake Temperature conditions under load and cable load.If current and voltage data and temperature data any data are more than threshold value, processor list Member 31 can generate alarm signal, and alarm signal is sent to the user terminal 60 by communication gate equipment 40 and server 50, Realize the early warning of the fault messages such as electric current, voltage and the temperature anomaly of controller switching equipment cable or copper bar.
And the processor unit 31 can pass through existing place to the analysis processing of current and voltage data and temperature data It manages device or logic control circuit is realized, software section is not belonging to the improvement of the utility model.
Specifically, first wireless transmission unit 32 includes Sub-1G low-consumption wireless transmission unit 321 and first day Line 322, second wireless transmission unit 33 include LPWAN wireless transmission unit 331 and the second antenna 332.The low function of Sub-1G Consumption wireless transmission unit 331 connect with processor unit 31 and passes through first antenna 322 in fact according to the control of processor unit 31 The transmission of existing data, LPWAN wireless transmission unit 331 connect with processor unit 31 and are led to according to the control of processor unit 31 Cross the transmission that the second antenna 332 realizes data.
In the present embodiment, as shown in fig. 6, the electrical detection module 10 includes for detecting controller switching equipment cable or copper bar The voltage sensor 11 of voltage and current sensor 12 for detecting controller switching equipment cable or copper bar electric current.The present embodiment is to set Set the voltage sensor 11 for detecting controller switching equipment voltage cable and the current sense for detecting controller switching equipment cable current It is explained for device 12.
Specifically, voltage sensor 11 and current sensor 12 can be sheathed on cable by wall-mounted or tie-type respectively The voltage and current of detection cable 100 is carried out on 100.
Preferably, in the present embodiment, the current sensor 12 uses Rogowski coil, measurement range is wide, without electromagnetism saturation, Transient response is good.The voltage sensor 11 induces charge using voltage induced copper foil (not shown) in the electric field, becomes The charge of change generates alternating current, and voltage is measured in transformed conditioning indirectly, obtains the voltage data of cable 100.The voltage passes The cost of sensor 11 is low.The setting of voltage sensor 11, convenient and efficient searching disconnection fault region and is automatically performed on cable 100 Inferior relation.
Wherein, current sensor 12 can detect the current conditions of cable 100, and voltage sensor 11 can detect cable 100 Voltage condition.And electrical detection module 10 can be set on the cable 100 of each controller switching equipment, cable 100 and electrical detection mould The mark of block 10 corresponds to, and staff can understand the peace of corresponding cable 100 according to the detection data of corresponding electrical detection module 10 Total state carries out unified monitoring operation and management convenient for power distribution room of the staff to each region, is convenient for power distribution room account information Operation management.
As shown in Fig. 2, the utility model provides a kind of preferred embodiment of communication gate equipment.
The communication gate equipment 40 include the gateway main body 42 being connect with lightning protection power source 41 and respectively with gateway main body 42, the gateway antennas 43 that concentrator module 30 and server 50 connect.
Communication gate equipment 40 is to realize that monitored voltage and current and temperature data are transmitted in power distribution room operational system The important equipment of user terminal 60.Lightning protection power source 41 is set in communication gate equipment 40, thunder and lightning and other internal mistakes can be prevented Voltage intrusion communication gate equipment 40 damages, and improves the O&M safety of power distribution room operational system, reduces maintenance cost.
Further, the communication gate equipment 40 further includes bracket 44 and the metal outer set on 43 periphery of gateway main body 45.Metal outer 45 is provided with the interference for being conducive to shield other electromagnetic signals, improves the stability of power distribution room operational system.
Specifically, communication gate equipment 40 can be erected inside a floor high position or power distribution room by bracket 44, Yi Jishe In the place that periphery is relatively spacious, far from radio transmitting base station, communication gate equipment 40 will carry out signal frequency point after setting up well Hot spot scanning.
In the present embodiment, the temperature detecting module 20 includes the temperature sensor on controller switching equipment cable or copper bar 21。
The normal operation of the ambient temperature effect controller switching equipment of power distribution room, in the bad situation of the ventilation condition of power distribution room Under, the temperature of power distribution room can increase, and when normal working temperature of the environment temperature more than controller switching equipment, will lead to controller switching equipment work It is abnormal, easily cause power failure, fire.And controller switching equipment, in During Process of Long-term Operation, cable 100 is easy aging or because of contact Resistance is excessive to there is superheating phenomenon, influences the service life of controller switching equipment, even results in fire.Therefore, by temperature sensor 21 On cable 100, the temperature of the accurate detection cable 100 of energy detects the environment temperature in power distribution room indirectly and monitors power distribution room Ventilation state, temperature data is eventually sent to user terminal 60 by concentrator module 30 and communication gate equipment 40, it is real The early warning of existing 100 temperature anomaly of cable, enables staff to understand the environment temperature and ventilation state of power distribution room in real time, keeps away Exempt from the generation of safety accident.
Further, as shown in figure 8, the power distribution room operational system further includes the function mould connecting with concentrator module 30 Block 70, the functional module 70 include smoke sensor device 71 or infrared sensor 72.Functional module 70 may include smoke sensor device 71, one or both of infrared sensor 72.Preferably, the functional module 70 in the present embodiment includes 71 He of smoke sensor device Infrared sensor 72.
Wherein, smoke sensor device 71 is for detecting power distribution room smoke condition.First wireless transmission of concentrator module 30 is single Member 32 connect and is received with the smoke sensor device 71 of functional module 70 the smoke condition data of the acquisition of smoke sensor device 71 and passes through Communication gate equipment 40 is sent to server 50, is sent to the user terminal 60 by server 50.
Smoke sensor device 71 realizes fire disasters protection by monitoring the concentration of smog, uses inside smoke alarm Ion type smog sensing, ion type smog sensor is a kind of advanced technology, sensor stable and reliable in work.
Specifically, can smoke sensor device 71 be installed in power distribution cabinet 90 or is installed on the ground in power distribution room outside power distribution cabinet 90 Side.When cable 100 generates smog and chemical gas because fire occurs for aging, overheat, smoke sensor device 70 can detect power distribution room Interior smoke condition senses exception, and smoke condition data is transmitted to concentrator module 30 and pass through communication gate equipment 40 It is eventually sent to user terminal 60,100 safe condition of cable is monitored, carries out the safety measure on fire of cable 100.
In addition, infrared sensor 72 swarms into situation for testing staff.Specifically, infrared sensor 72 is set in power distribution room And connect with the first wireless transmission unit 32 of concentrator module 30, the personnel of having detected whether swarm into power distribution room.Once there is personnel Power distribution room is swarmed into, inductive signal, that is, personnel are swarmed into situation data and are sent to concentrator module 30 by infrared sensor 72, by concentrating The centralized processing analysis of device module 30 is eventually sent to user terminal 60 by communication gate equipment 40, notifies user.
In the present embodiment, the power distribution room operational system further includes power distribution cabinet 90, and the cable connecting with power distribution cabinet 90 100, the cable 100 include the main cable 101 being connect with outside line and respectively with main cable 101 and power distribution cabinet 90 The a plurality of branch cable 102 of connection is arranged on each branch cable 102 and connect with concentrator module 30 and be used to detect The running state detecting device 110 of 102 operating status of branch cable.
Wherein, the operating status of branch cable 102 includes the electric current of branch cable 102, voltage and temperature.The present embodiment In, can by voltage sensor 11, current sensor 12 and temperature sensor 21 it is integrally disposed at running state detecting device 110 simultaneously It is sheathed on branch cable 102 by wall-mounted or tie-type, detection obtains voltage, electric current and the temperature number of branch cable 102 According to, and by wireless transmission to concentrator module 30, it is easy for installation, and improve detection accuracy.
Further, the power distribution cabinet 90 includes multiple electric connection parts 91 and the mounting portion connecting with electric connection part 91 92, the branch cable 102 is connect with electric connection part 91, and the concentrator module 30 is set in mounting portion 92.By branch electricity Cable 102 is connect with the electric connection part 91 of power distribution cabinet 90, then the running state detecting device 110 being sheathed on branch cable 102 Also it is set in power distribution cabinet 90.Running state detecting device 110 is closer with concentrator module 30, and data transmission bauds is fast, Transmission is stablized, and transmission security is high, and energy consumption is low.
In the present embodiment, the power distribution room operational system further includes connecting with concentrator module 30 and for obtaining power distribution room The locating module 80 of location information.
Wherein, the locating module 80 includes GPS positioning module or Beidou positioning module.In the present embodiment, the positioning Module 80 includes GPS positioning module.GPS positioning module is installed on the first wireless transmission in power distribution room and with concentrator module 30 Unit 32 connects.When the corresponding electrical detection module 10 of power distribution room, temperature detecting module 20, smoke sensor device 71 and infrared sensing Device 72 detects exception, and staff can lock rapidly the position for abnormal power distribution room occur, improve efficiency, avoid accident into one Step ground expands, and shortens number and the time of the power failure due to caused by failure, reduces and use electric loss, improves power distribution network operation level.
In the present embodiment, user terminal 60 may include mobile phone or computer, the exception and location information meeting of fault point power distribution room It is pushed on the mobile phone or computer of related personnel by short message or APP.
The modules of the power distribution room operational system of the utility model can be installed and be run when controller switching equipment charges, It is easy for construction.And the electrical detection module 10 of power distribution room operational system, temperature detecting module 20, functional module 70 can be Controller switching equipment electric current works normally in the case where being zero.
It should be understood that above embodiments are only to illustrate the technical solution of the utility model, it is rather than its limitations, right For those skilled in the art, it can modify to technical solution illustrated in the above embodiments, or to part of skill Art feature is equivalently replaced;And all such modifications and replacement, it all should belong to the protection of the appended claims for the utility model Range.

Claims (10)

1. a kind of power distribution room operational system based on Internet of Things, for the power distribution cabinet and controller switching equipment progress O&M pipe to power distribution room Reason, which is characterized in that the power distribution room operational system includes:
For detecting the electrical detection module of the Current Voltage of controller switching equipment cable or copper bar;
For detecting the temperature detecting module of the temperature of controller switching equipment cable or copper bar;
Concentrator module, connect with electrical detection module and temperature detecting module respectively and reception and analysis processing electrically detects mould The temperature data that the current and voltage data and temperature detecting module that block obtains obtain;
Communication gate equipment connect and is received with concentrator module concentrator module analysis treated data and beaten again Packet;
Server connect with communication gate equipment and receives the data after communication gate equipment is repacked;
User terminal connect the data for receiving communication gate equipment with server.
2. power distribution room operational system according to claim 1, which is characterized in that the concentrator module includes processor list Member, the first wireless transmission unit being connect respectively with electrical detection module, temperature detecting module and processor unit, and respectively The second wireless transmission unit connecting with processor unit and communication gate equipment, the processor unit is to electrical detection module The temperature data that the current and voltage data and temperature detecting module of acquisition obtain is wirelessly transferred after being analyzed and processed by second Unit is transmitted to communication gate equipment.
3. power distribution room operational system according to claim 1 or 2, which is characterized in that the power distribution room operational system also wraps Power distribution cabinet, and the cable connecting with power distribution cabinet are included, the cable includes the main cable connecting with outside line and difference The a plurality of branch cable connecting with main cable and power distribution cabinet is arranged on each branch cable and connect with concentrator module And the running state detecting device for detecting branch cable operating status.
4. power distribution room operational system according to claim 3, which is characterized in that the power distribution cabinet includes multiple electrical connections Portion and the mounting portion connecting with electric connection part, the branch cable are connect with electric connection part, and the concentrator module is set to In mounting portion.
5. power distribution room operational system according to claim 2, which is characterized in that the electrical detection module includes for examining It is measured the voltage sensor of electric equipment cable or copper bar voltage and the electric current for detecting controller switching equipment cable or copper bar electric current passes Sensor.
6. power distribution room operational system according to claim 2, which is characterized in that the communication gate equipment includes thunder-lightning Source, the gateway main body being connect with lightning protection power source and the gateway day being connect respectively with gateway main body, concentrator module and server Line.
7. power distribution room operational system according to claim 2, which is characterized in that the temperature detecting module includes being set to match Temperature sensor on electric equipment cable or copper bar.
8. power distribution room operational system according to claim 2, which is characterized in that the power distribution room operational system further include with The functional module of concentrator module connection, the functional module includes smoke sensor device or infrared sensor.
9. power distribution room operational system according to claim 2, which is characterized in that the power distribution room operational system further include with Concentrator module connects and is used to obtain the locating module of power distribution room location information.
10. power distribution room operational system according to claim 9, which is characterized in that the locating module includes GPS positioning mould Block or Beidou positioning module.
CN201821772458.9U 2018-10-30 2018-10-30 A kind of power distribution room operational system based on Internet of Things Expired - Fee Related CN209069331U (en)

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Application Number Priority Date Filing Date Title
CN201821772458.9U CN209069331U (en) 2018-10-30 2018-10-30 A kind of power distribution room operational system based on Internet of Things

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Application Number Priority Date Filing Date Title
CN201821772458.9U CN209069331U (en) 2018-10-30 2018-10-30 A kind of power distribution room operational system based on Internet of Things

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109357710A (en) * 2018-10-30 2019-02-19 深圳市金博联电力技术有限公司 A kind of power distribution room operational system based on Internet of Things

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109357710A (en) * 2018-10-30 2019-02-19 深圳市金博联电力技术有限公司 A kind of power distribution room operational system based on Internet of Things

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Granted publication date: 20190705