CN209402241U - Distribution network load monitoring device and distribution system - Google Patents
Distribution network load monitoring device and distribution system Download PDFInfo
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- CN209402241U CN209402241U CN201920182155.XU CN201920182155U CN209402241U CN 209402241 U CN209402241 U CN 209402241U CN 201920182155 U CN201920182155 U CN 201920182155U CN 209402241 U CN209402241 U CN 209402241U
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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
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Abstract
The utility model relates to a distribution network load monitoring device and distribution system. A power distribution network load monitoring device is provided with an acquisition module and a display module. In the power supply process of the power distribution system, the acquisition unit acquires three-phase voltage and three-phase current of the power distribution network, the three-phase voltage and the three-phase current are processed by the data processing unit to obtain relevant parameters of the load of the power distribution network, and the relevant parameters are displayed by the display module. The monitoring device can monitor the load of the power distribution network, thereby reducing the probability of danger of the power distribution network due to overload of the load and improving the safety of the power distribution system.
Description
Technical field
The utility model relates to distribution network load monitoring technologies, more particularly to distribution network load monitoring device and power distribution system
System.
Background technique
With the rapid development of the national economy, society is increasing to electricity needs, the load of power grid is also increasingly heavier.For
Safety, stability and the reliability of electric system have become the main problem of puzzlement power supply enterprise.
In traditional technology, distribution system is usually by distribution transformer and the power distribution network group being electrically connected with distribution transformer
At.
Inventor has found during realizing traditional technology: traditional distribution system can not supervise its bearing load
Control, is easy to produce danger.
Utility model content
Based on this, it is necessary to be asked for what distribution system present in traditional technology can not be monitored its bearing load
Topic provides a kind of distribution network load monitoring device and distribution system.
A kind of distribution network load monitoring device, the display mould including acquisition module and with acquisition module communication connection
Block；The acquisition module includes: acquisition unit, is electrically connected with the power distribution network, to acquire the power data of the power distribution network；
The power data includes the three-phase voltage and three-phase current of the power distribution network；Data processing unit, with the acquisition unit electricity
Property connection, to be handled the power data and obtain processing result；The processing result includes the function of the power distribution network
At least one of rate, load factor and tri-phase unbalance factor；The display module and the data processing unit communicate to connect, to obtain
It takes the processing result of the data processing unit and is shown.
Above-mentioned distribution network load monitoring device has acquisition module and display module.In distribution system power supply process, adopt
Collection unit can acquire power distribution network three-phase voltage and three-phase current, and the correlation of distribution network load is obtained after data processing unit is handled
Parameter, and shown by display module.The monitoring device can be monitored the load of power distribution network, to reduce distribution
Net generates dangerous probability because of traffic overload, promotes the safety of distribution system.
The distribution network load monitoring device in one of the embodiments, further includes: alarm module, with the number
It is electrically connected according to processing unit, to receive the control signal of the data processing unit transmitting；The data processing unit is equipped with
The threshold range of the corresponding processing result, when threshold range to exceed the alignment processing result when the processing result,
Control the alarm module work.
Above-mentioned distribution network load monitoring device, further includes alarm module, can be in the load parameter of power distribution network beyond certain
It alarms when threshold value, so that reducing power distribution network generates dangerous probability because of traffic overload, promotes the safety of distribution system.
The display module includes the first display unit and the second display unit in one of the embodiments,；Described
One display unit and the data processing unit are electrically connected, to obtain processing result and the display of the data processing unit；
Second display unit and the data processing unit are wirelessly connected, to obtain the processing result of the data processing unit simultaneously
Display.
Above-mentioned distribution network load monitoring device, display module include the first display being electrically connected with data processing unit
Unit and the second display unit being wirelessly connected with data processing unit, can be to the load number that data processing unit processes obtain
According to short distance wired monitoring and remote-wireless monitoring is carried out, so that reducing power distribution network generates the general of danger because of traffic overload
Rate promotes the safety of distribution system.
The acquisition module further includes the first communication unit in one of the embodiments, first communication unit with
The data processing unit is electrically connected, and is carried out with obtaining the processing result of the data processing unit and being converted to wireless signal
Transmitting.
The display module further includes the second communication unit in one of the embodiments, second communication unit with
First communication unit is wirelessly connected, to obtain the wireless signal and be converted to electric signal；Second communication unit with
Second display unit is electrically connected, and the electric signal is transferred to second display unit.
The wireless communication between first communication unit and second communication unit connects in one of the embodiments,
The mode of connecing includes at least one of GPRS, EDGE, TD-SCDMA, HSDPA, Bluetooth, RFID and GSM.
The distribution network load monitoring device in one of the embodiments, further includes: control unit, with described the
Two communication units are electrically connected, to obtain the processing result of the data processing unit；Described control unit and the power distribution network
Distribution transformer communication connection, with according to the processing result adjust institute's distribution transformer parameter.
Above-mentioned distribution network load monitoring device also has control unit, can be calculated according to data processing unit
Distribution transformer is adjusted in load data, so that distribution transformer be made to operate normally, extend distribution transformer uses the longevity
Life promotes power distribution system secure.
The acquisition module further includes power supply unit in one of the embodiments,；Said supply unit and the acquisition
Unit, data processing unit and the first communication unit are electrically connected and power.
Analog-digital converter is equipped in the acquisition unit in one of the embodiments, the power data is converted
For binary system discrete signal.
A kind of distribution system further includes matching including distribution network load monitoring device described in any one above-mentioned embodiment
Piezoelectric transformer and the power distribution network being electrically connected with the distribution transformer；The acquisition unit of the distribution network load monitoring device with
The power distribution network is electrically connected.
Above-mentioned distribution system can be to distribution including the distribution network load monitoring device in any one above-mentioned embodiment
The load of net is monitored, so that reducing power distribution network generates dangerous probability because of traffic overload, promotes the safety of distribution system
Property.
Detailed description of the invention
Fig. 1 is the modular structure schematic diagram of monitoring device in the application one embodiment.
Fig. 2 is the modular structure schematic diagram of monitoring device in another embodiment of the application.
Fig. 3 is the modular structure schematic diagram of monitoring device in another embodiment of the application.
Fig. 4 is the schematic diagram of internal structure of display device in the application one embodiment.
Wherein, meaning representated by each drawing reference numeral is respectively as follows:
10, monitoring device；
100, acquisition module；
110, acquisition unit；
120, data processing unit；
130, the first communication unit；
200, display module；
210, the first display unit；
220, the second display unit；
230, the second communication unit；
300, alarm module；
400, control unit；
500, power supply unit；
12, master station computer.
Specific embodiment
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing to this
The specific embodiment of utility model is described in detail.Many details are explained in the following description in order to abundant
Understand the utility model.But the utility model can be implemented with being much different from other way described herein, this field
Technical staff can do similar improvement without prejudice to the utility model connotation, therefore the utility model is not by following public affairs
The limitation for the specific embodiment opened.
The application provides a kind of distribution network load monitoring device for monitoring distribution system bearing load in real time.Wherein, distribution
System bearing load includes at least one of the power of power distribution network, load factor and tri-phase unbalance factor.
A kind of distribution network load monitoring device 10, including for acquiring power distribution network power data and obtaining distribution network load
Acquisition module 100, and be electrically connected with the acquisition module 100, with the display module 200 shown to distribution network load.
Specifically, acquisition module 100 is used to acquire the power data of power distribution network, and processing is carried out to power data and is calculated
To the bearing load of power distribution network.The acquisition module 100 includes acquisition unit 110 and the data with the electric connection of acquisition unit 110
Processing unit 120.Wherein, acquisition unit 110 and power distribution network are electrically connected, to acquire the power data of power distribution network, confession here
Electric data include the three-phase voltage and three-phase current of power distribution network.The three-phase voltage and three-phase electricity of the acquisition power distribution network of acquisition unit 110
After stream, it is transferred to the data processing unit 120 being electrically connected.Data processing unit 120 can be a processing controller.Number
Processing calculating can be carried out to three-phase voltage and three-phase current according to processing unit 120, to obtain processing result.Here processing
As a result at least one including the power of power distribution network, load factor and tri-phase unbalance factor.
Display module 200 and acquisition module 100 communicate to connect, for obtaining the communication information of the transmitting of acquisition module 100 simultaneously
Display.When the distribution network load monitoring device 10 works, acquisition module 100 both can be by the collected three-phase of acquisition unit 110
Voltage and three-phase current are transferred to display module 200 and are shown；The distribution that data processing unit 120 can also be calculated
At least one of net power, load factor and tri-phase unbalance factor is transferred to display module 200 and is shown.
More specifically, when which works, the acquisition of acquisition unit 110 of acquisition module 100 is matched
The three-phase voltage and three-phase current of power grid.After data processing unit 120 obtains the three-phase voltage and three-phase current, default journey is executed
Ordered pair three-phase voltage and three-phase current data carry out processing calculating, and the power such as power distribution network, load factor and three-phase can be obtained not
The processing results such as the degree of balance.For example, the calculating of power can be the line voltage of power distribution network multiplied by line current, it is also possible to each phase electricity
Pressure is multiplied by each phase current.The calculating of load factor can be the actual power of power distribution network divided by rated power.Tri-phase unbalance factor packet
Include the unbalanced data of three-phase voltage and the unbalanced data of three-phase current.The calculating of the unbalanced data of three-phase voltage can be
The maximum difference of three-phase voltage divided by three-phase voltage average value.The calculating of the unbalanced data of three-phase current can be three-phase electricity
The maximum difference of stream divided by three-phase current average value.Data processing unit 120 obtains the three-phase voltage and three-phase electricity of power distribution network
After stream, at least one of the above load data should at least be calculated, and be passed to display module 200.Display module 200
It is shown according to the information that data processing unit 120 transmits.
The monitoring device 10 can be monitored the load of power distribution network, generate to reduce power distribution network because of traffic overload
Dangerous probability, promotes the safety of distribution system.
In one embodiment, as shown in Fig. 2, above-mentioned monitoring device 10 is additionally provided with alarm module 300.
Specifically, which can be the sound alarm subsystems such as buzzer siren, be also possible to light crossing-signal.Report
Alert module 300 is electrically connected with data processing unit 120, thus by the control of data processing unit 120, according to data processing
The processing result of unit 120 works.For example, three-phase voltage, three-phase current, power distribution network can be directed in data processing unit 120
At least one of power, power distribution network load factor and tri-phase unbalance factor is equipped with threshold range.When data processing unit 120 is got
Three-phase voltage and three-phase current, and power distribution network power, load factor and three-phase are calculated not according to three-phase voltage and three-phase current
After the degree of balance, it can be compared with threshold range.If three-phase voltage, three-phase current, power distribution network power, power distribution network load
Rate and at least one of tri-phase unbalance factor exceed corresponding threshold range, then data processing unit 120 controls alarm module 300
Work.
It is to be appreciated that in data processing unit 120 preset threshold range should with compared with processing result or
Three-phase voltage, three-phase current are corresponding.For example, data processing unit 120 only calculates distribution according to three-phase voltage and three-phase current
When net power, power threshold can be preset in data processing unit 120, with when power distribution network power exceed the power threshold when,
Data processing unit 120 controls alarm module 300 and works.The alarm module 300 can exceed one in the load parameter of power distribution network
Determine to alarm when threshold value, so that reducing power distribution network generates dangerous probability because of traffic overload, promotes the safety of distribution system
Property.
In one embodiment, as shown in Fig. 2, above-mentioned display module 200 includes the first display unit 210 and the second display
Unit 220.
Specifically, above-mentioned display module 200 is communicated to connect with data processing unit 120, to obtain data processing unit 120
The communication information of transmitting and display.The display module 200 may include mutually independent first display unit 210 and the second display
Unit 220.Wherein, the first display unit 210 and data processing unit 120 are electrically connected, to obtain number by wire communication
The communication information transmitted according to processing unit 120 and display.The communication information may include the processing knot of data processing unit 120
Fruit.Second display unit 220 and data processing unit 120 are wirelessly connected, to obtain data processing unit by wireless communication
120 communication informations transmitted and display.The communication information may include the processing result of data processing unit 120.Monitoring dress
10 are set, short distance wired monitoring can be carried out to the load data that the processing of data processing unit 120 obtains and remote-wireless is supervised
Control promotes the safety of distribution system so that reducing power distribution network generates dangerous probability because of traffic overload.
Further, as shown in figure 3, the first display unit 210 can electrically be connected by cable with data processing unit 120
It connects.
Second display unit 220 equipment and data processing unit 120 can communicate to connect by wireless communication.
Specifically, acquisition module 100 may include the first communication unit 130.It is wireless that first communication unit 130 can be one
Signal transmitter unit.First communication unit 130 is electrically connected with data processing unit 120, to make data processing unit 120 can
To transmit the communication information to the first communication unit 130.First communication unit 130 is used to obtain the transmitting of data processing unit 120
The communication information, and the communication information is converted into wireless signal and is launched.The communication information may include data processing unit
The three-phase voltage and three-phase electricity flow valuve of 120 processing result or/and acquisition unit 110 acquisition.
Display module 200 may include the second communication unit 230.Second communication unit 230 can be a wireless signal and connect
Receive unit.Second communication unit 230 and the first communication unit 130 wireless communication connect, to obtain the transmitting of the first communication unit 130
Wireless signal, and the wireless signal is converted into electric signal.Second communication unit 230 electrically connects with the second display unit 220
It connects, which is transferred to the second display unit 220.It, can be according to this after second display unit 220 obtains the electric signal
Electric signal is shown.
For example, data processing unit 120 obtains three-phase voltage and three-phase current, and after the power of power distribution network is calculated,
Can send to the first communication unit 130 includes three-phase voltage value, the communication information of three-phase electricity flow valuve and performance number.First communication
After unit 130 obtains the communication information, converts it to wireless signal and emit.Second communication unit 230 gets wireless communication
After number, then converts it to the electric signal comprising three-phase voltage value, three-phase electricity flow valuve and performance number and be transferred to the second display unit
220.At this point, the second display unit 220 can show three-phase voltage value, three-phase electricity flow valuve and performance number accordingly.
Further, the wireless communication connection type between the first communication unit 130 and the second communication unit 230 includes
GPRS (General Packet Radio Service, general packet radio service technology), EDGE (Enhanced Data
Rate for GSM Evolution, enhanced data rates for gsm evolution technology), TD-SCDMA (Time Division-
Synchronous Code Division Multiple Access, TD SDMA), HSDPA (High Speed
Downlink Packet Access, high-speed slender body theory), Bluetooth (bluetooth), RFID (Radio Frequency
Identification, radio frequency identification) and GSM (Global System For Mobile Communications, whole world shifting
Dynamic communication system) at least one.
In one embodiment, above-mentioned monitoring device 10 can also include control unit 400.
Specifically, control unit 400 can be electrically connected with the second communication unit 230, to obtain data processing unit 120
Processing result.That is, being converted to wireless signal when the processing result of data processing unit 120 is sent to the first communication unit 130
Launch, after the second communication unit 230 obtains the wireless signal and is converted to electric signal, which is transferred to control simultaneously
Unit 400 processed.
Pre-set programs can be equipped in the control unit 400, to obtain when control unit 400 comprising above-mentioned processing result
After electric signal, above-mentioned processing result can be analyzed, and reason result adjusts the parameter of distribution transformer according to this.Example
Such as, when control unit 400 gets three-phase voltage and three-phase electricity flow valuve, three-phase voltage and three-phase current can be divided
Analysis, and distribution transformer parameter is adjusted, keep each phase voltage equal, to guarantee the stability of line voltage, promotes power quality.
In the embodiment, the parameter of distribution transformer may include such as three-phase voltage and electric voltage frequency.To the parameter of distribution transformer
It is adjusted, can be with the load of coordinated control distribution transformer, to realize the normal operation of each distribution transformer, extension is matched
Piezoelectric transformer service life.
Further, multi-agent algorithm can be equipped in control unit 400, thus by multi-agent algorithm to upper
It states processing result to be analyzed, and is adjusted by parameter of the multi-agent algorithm to distribution transformer.Use multiple agent
Algorithm adjusts distribution transformer parameter, the course of work of control unit 400 can be made more intelligent, to realize each distribution
The normal operation of transformer extends distribution transformer service life.
In one embodiment, above-mentioned control unit 400 and the second communication unit 230, the second display unit 220 can collect
At in master station computer 12.
Specifically, master station computer 12 may include generally the host with computing function and display having a display function
Screen, and master station computer 12 can also generally have reception of wireless signals and emission function.Therefore, master station computer 12 can be same
When have both the function of the second communication unit 230, the second display unit 220 and control unit 400.At this point, acquisition module 100 acquires
To after three-phase voltage and three-phase current and calculation processing, the first display unit 210 can be passed to and shown, it can also be with
It is transferred to master station computer 12.Meanwhile acquisition module 100 is also electrically connected with alarm module 300.
In one embodiment, analog-digital converter is additionally provided in above-mentioned acquisition unit 110.
Specifically, analog-digital converter (Analog to Digital, A/D converter) is by compared with reference quantity
Analog quantity after reason is converted to the converter of the discrete signal indicated with binary numeral.In the present embodiment, analog-digital converter
For the collected three-phase voltage of acquisition unit 110 and three-phase current to be converted to binary system discrete signal, at data
Manage the identification of unit 120.
Below with reference to Fig. 4, explained from distribution network load monitoring device 10 of the specific embodiment to the application
Explanation.
Distribution network load monitoring device 10 includes acquisition unit 110, data processing unit 120, alarm module 300, first
Display unit 210, the first communication unit 130 and master station computer 12.Wherein master station computer 12 has the second communication unit
230, the second display unit 220 and control unit 400.Multi-agent algorithm is equipped in control unit 400.
Analog-digital converter in acquisition unit 110 can be by the analog signal of three-phase voltage and three-phase current in power distribution network
Digital data transmission is converted to data processing unit 120.Data processing unit 120 obtains the three-phase voltage and three-phase current
Afterwards, calculation processing obtains the degree of unbalancedness of power, load factor and the three-phase voltage of power distribution network, three-phase current.Data processing unit
The power threshold of power distribution network is equipped in 120, when power distribution network power exceeds the power threshold, control alarm module 300 works.
120 calculation processing of data processing unit obtains power, load factor and the three-phase voltage of power distribution network, three-phase current not
After the degree of balance, the processing result is also sent to the first display unit 210, and main website is sent to by the first communication unit 130
Computer 12.First display unit 210 can power, load factor and three-phase voltage to power distribution network, three-phase current imbalance
Degree is shown.Master station computer 12 obtains processing result by the second communication unit 230, and passes through the second display unit 220
Display.Meanwhile the multi-agent algorithm in the control unit 400 of master station computer 12 can also be according to the power of power distribution network, negative
The parameter of distribution transformer is adjusted in load rate and the degree of unbalancedness of three-phase voltage, three-phase current, makes each distribution transformer just
Often operation.To extend the service life of distribution transformer.
In this embodiment, distribution network load monitoring device 10 can also have power supply unit 500.Power supply unit 500 with
Other units are electrically connected, to power to other units.It repeats no more.
The application also provides a kind of distribution system, including the monitoring device 10 in any one above-mentioned embodiment.Further include:
Distribution transformer and the power distribution network being electrically connected with the distribution transformer.
Specifically, which includes: the Yi Jiyu for providing electric energy and controlling the distribution transformer of distribution voltage
Distribution transformer is electrically connected, for conveying the power distribution network of electric energy.
Meanwhile the distribution system is at least further include: acquisition module 100 and the display mould communicated to connect with acquisition module 100
Block 200.Wherein, acquisition module 100 includes acquisition unit 110 and data processing unit 120.Acquisition unit 110 and power distribution network electricity
Property connection, to acquire the power data of power distribution network.The power data includes the three-phase voltage and three-phase current of power distribution network.At data
It manages unit 120 and acquisition unit 110 is electrically connected, to be handled power data and obtain processing result.The processing result
At least one of power, load factor and tri-phase unbalance factor including power distribution network.Display module 200 and data processing unit 120
Communication connection, is shown with obtaining the processing result of data processing unit 120.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of distribution network load monitoring device, which is characterized in that communicated to connect including acquisition module and with the acquisition module
Display module；The acquisition module includes:
Acquisition unit is electrically connected, to acquire the power data of the power distribution network with the power distribution network；The power data includes
The three-phase voltage and three-phase current of the power distribution network；
Data processing unit is electrically connected with the acquisition unit, to be handled the power data and be obtained processing knot
Fruit；The processing result includes at least one of the power of the power distribution network, load factor and tri-phase unbalance factor；
The display module and the data processing unit communicate to connect, to obtain the processing result of the data processing unit simultaneously
It is shown.
2. distribution network load monitoring device according to claim 1, which is characterized in that further include:
Alarm module is electrically connected with the data processing unit, to receive the control signal of the data processing unit transmitting；
The data processing unit is equipped with the threshold range of the corresponding processing result, to exceed the corresponding position when the processing result
When managing the threshold range of result, the alarm module work is controlled.
3. distribution network load monitoring device according to claim 1, which is characterized in that the display module includes first aobvious
Show unit and the second display unit；
First display unit and the data processing unit are electrically connected, to obtain the processing knot of the data processing unit
Fruit simultaneously shows；
Second display unit and the data processing unit are wirelessly connected, to obtain the processing knot of the data processing unit
Fruit simultaneously shows.
4. distribution network load monitoring device according to claim 3, which is characterized in that the acquisition module further includes first
Communication unit, first communication unit and the data processing unit are electrically connected, to obtain the data processing unit
Processing result is simultaneously converted to wireless signal and is emitted.
5. distribution network load monitoring device according to claim 4, which is characterized in that the display module further includes second
Communication unit, second communication unit and first communication unit are wirelessly connected, to obtain the wireless signal and convert
For electric signal；Second communication unit and second display unit are electrically connected, and the electric signal are transferred to described
Second display unit.
6. distribution network load monitoring device according to claim 5, which is characterized in that first communication unit with it is described
Wireless communication connection type between second communication unit includes GPRS, EDGE, TD-SCDMA, HSDPA, Bluetooth, RFID
With at least one of GSM.
7. distribution network load monitoring device according to claim 5, which is characterized in that further include:
Control unit is electrically connected, to obtain the processing result of the data processing unit with second communication unit；It is described
The distribution transformer of control unit and the power distribution network communicates to connect, to adjust institute's distribution transformer according to the processing result
Parameter.
8. distribution network load monitoring device according to claim 4, which is characterized in that the acquisition module further includes power supply
Unit；Said supply unit is electrically connected and powers with the acquisition unit, data processing unit and the first communication unit.
9. distribution network load monitoring device according to claim 1, which is characterized in that be equipped with modulus in the acquisition unit
The power data is converted to binary system discrete signal by converter.
10. a kind of distribution system, which is characterized in that monitored including distribution network load as claimed in any one of claims 1 to 9
The power distribution network that device further includes distribution transformer and is electrically connected with the distribution transformer；
The acquisition unit and the power distribution network of the distribution network load monitoring device are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920182155.XU CN209402241U (en) | 2019-01-31 | 2019-01-31 | Distribution network load monitoring device and distribution system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920182155.XU CN209402241U (en) | 2019-01-31 | 2019-01-31 | Distribution network load monitoring device and distribution system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787359A (en) * | 2019-01-31 | 2019-05-21 | 深圳供电局有限公司 | Distribution network load monitoring device and distribution system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787359A (en) * | 2019-01-31 | 2019-05-21 | 深圳供电局有限公司 | Distribution network load monitoring device and distribution system |
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