CN206364515U - One kind automatically adjusts three-phase imbalance comprehensive distribution box - Google Patents
One kind automatically adjusts three-phase imbalance comprehensive distribution box Download PDFInfo
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- CN206364515U CN206364515U CN201621168369.4U CN201621168369U CN206364515U CN 206364515 U CN206364515 U CN 206364515U CN 201621168369 U CN201621168369 U CN 201621168369U CN 206364515 U CN206364515 U CN 206364515U
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
Three-phase imbalance comprehensive distribution box is automatically adjusted the utility model discloses one kind, including：End of incoming cables, it is connected with three phase network；Leading-out terminal, it is connected by circuit with end of incoming cables, wherein, the first obtaining current end, power taking pressure side and the second obtaining current end are provided between end of incoming cables and leading-out terminal；Multifunctional electric energy meter, its first sampling end is accessed at the first obtaining current end, the second sampling end and power taking press bond；And regulation compensating module, it includes：Static reacance generator, its sampling end is connected with the second obtaining current end；Idle compensating control, two sampling end respectively with the second obtaining current end, power taking press bond；And shunt capacitance, it compensates output end by the controlling switch access circuit in parallel with the regulation output end of the idle compensating control, wherein, the controlling switch is connected with the control end of the idle compensating control.The distribution box can realize the comprehensive intelligent control to power changes such as complicated three-phase imbalance, harmonic wave interferences.
Description
Technical field
The utility model is related to comprehensive distribution box field, and more particularly to one kind automatically adjusts three-phase imbalance overall power distribution
Case.
Background technology
Comprehensive distribution box is a kind of traditional overall power distribution equipment, is widely used in low-voltage network, is a kind of standard
Change, minimize power distribution equipment.It has the work(such as overload, short circuit, phase shortage, under-voltage, over-pressed, residual current overcurrent protection and lightning protection
Can, integrate distribution, metering, reactive-load compensation, be the main power equipment of power distribution network.
Traditional comprehensive distribution box has certain inactive power compensation, but for shadows such as three-phase imbalance, harmonic wave interferences
The problem of ringing the quality of power supply, traditional comprehensive distribution box can not be solved, and generally requiring to install additional improves the equipment of the quality of power supply：Such as nothing
Source LC wave filters, static passive compensation device SVC, static reactive generator SVG, active power filtering APF, dynamic voltage regulation
Device DVR etc..But the single device of any of the above all can only improve the quality of power supply in a certain respect, and cost performance is not
Height, has no idea to obtain practical application completely., can be big if all taking a kind of adjusting means respectively for every kind of power quality problem
Big increase treatment cost, can also increase the complexity of plant running maintenance, reduce reliability.Not only increase equipment manufacturing cost, and
Many complete equipments cause in-site installation difficult, it is necessary to repeatedly have a power failure, in addition, can also influence urban.
In addition, the current generally existing three-phase imbalance of low-voltage network, power factor is relatively low, voltage is low, harmonic content is big etc.
Problem, in this regard, traditional comprehensive distribution box is helpless.Power quality problem not only influences user power utilization, and has a strong impact on
To the safe operation of power network and electrical equipment ground, while adding the loss of power equipment and electrical energy transportation, three-phase imbalance is caused
Main cause Deng power quality problem includes：
1) electricity consumption behavior is not known, intermittent electricity consumption, seasonal electricity consumption, and peak, paddy power consumption difference are big.
2) resident family is scattered or concentrates unordered, and supply line is complicated, and distribution transforming is layouted unreasonable, and radius of electricity supply is different in size.
3) nonlinear load increases, and harmonic content increase, transformer and electrical equipment caloric value are big, or even puncture electric capacity
Device, causes platform area power factor low, reduces conveying electrical efficiency.
4) reactive-load compensation response speed in platform area is slow, occurred to mend often or owed to mend.
5) line load distribution imbalance and electricity consumption time irreversibility, cause the serious three-phase imbalance in platform area.
6) electrical reticulation design standard configuration is relatively low.
Solve at present low-voltage power distribution station area power quality problem measure it is main by transformation distribution transforming, transformation circuit, install additional often
Advise three kinds of methods such as reactive power compensator.
In various Non Power Compensation Process, shunt capacitor is due to its simple structure, convenient, flexible installation side
The characteristics of in terms of method, relatively low operating cost and cheap product price, but shunt capacitor also has its weak point, only
The reactive power that energy grading compensation is fixed, is step-like compensation, and can not realize continuous, linear compensation.And be
When there is harmonic wave in system, it is also possible to produce parallel resonance with the self-reactance in system, make amplified harmonic current (up to specified electricity
Even tens times of several times of stream), cause capacitor and related component and circuit heavy overload and burn, in addition, for platform area
Tri-phase unbalance factor can not be adjusted, and cause the loss increase of platform area and influence platform area's safe operation, and other functions are installed in later stage progress additional
Device increases cost and increase installation difficulty again.
The information for being disclosed in the background section is merely intended to increase the understanding to general background of the present utility model, and
It is not construed as recognizing or implies that the information structure has been existing well known to persons skilled in the art in any form
Technology.
Utility model content
The purpose of this utility model is that providing one kind automatically adjusts three-phase imbalance comprehensive distribution box, so as to overcome existing
The poor shortcoming of various Non Power Compensation Process processing low-voltage power distribution station area power quality problem effects.
To achieve the above object, the utility model automatically adjusts three-phase imbalance comprehensive distribution box there is provided one kind, including：
End of incoming cables, it is connected with three phase network；Leading-out terminal, it is connected by circuit with the end of incoming cables, wherein, the end of incoming cables and institute
State and the first obtaining current end, power taking pressure side and the second obtaining current end are provided between leading-out terminal；Multifunctional electric energy meter, its first sampling end
Access at the first obtaining current end, the second sampling end and the power taking press bond；And regulation compensating module, it includes：
Static reacance generator, its sampling end is connected with the second obtaining current end；Idle compensating control, two sampling end difference
With the second obtaining current end, power taking press bond；And shunt capacitance, its compensate output end by controlling switch with it is described static
The regulation output end parallel connection access circuit of reacance generator, wherein, the controlling switch and the idle compensating control
Control end connection.
Preferably, in above-mentioned technical proposal, the static reacance generator includes：Sub-controller, its sampling end with it is described
Second obtaining current end is connected；PWM signal generator, its input is connected with the output end of the sub-controller；And three-phase inversion
Bridge, its control end is connected with the output end of the PWM signal generator, and output end accesses the circuit.
Preferably, in above-mentioned technical proposal, the end of incoming cables, leading-out terminal, compensation output end and regulation output end are connected
Circuit on be equipped with moulded case circuit breaker.
Preferably, in above-mentioned technical proposal, the first sampling end of the multifunctional electric energy meter is accessed by current transformer
At the first obtaining current end.
Preferably, in above-mentioned technical proposal, the idle compensating control, sub-controller are connect by current transformer respectively
Enter at the second obtaining current end.
Preferably, in above-mentioned technical proposal, on the circuit for connecting the controlling switch, regulation output end and compensation output end
It is equipped with miniature circuit breaker.
Preferably, in above-mentioned technical proposal, the end of incoming cables is provided with master switch.
Preferably, in above-mentioned technical proposal, in addition to three-phase imbalance comprehensive distribution box is automatically adjusted provided with lightning rod.
Preferably, in above-mentioned technical proposal, in addition to a display screen, the display screen respectively with the sub-controller, idle
Compensating controller is connected.
Compared with prior art, the utility model has the advantages that：
The utility model adds two-way reactive-load compensation, three-phase imbalance Intelligent adjustment and filter function, can be automatically quick
Current waveform needed for compensating power size and three-phase imbalance needed for the instantaneous calculating platform area of tracking, automatic precisely compensation nothing
Work(power and adjustment current unbalance factor, are allowed to meet power network standard.Meanwhile, distribution box can compensate fundamental reactive current,
Harmonic current can be compensated, be used widely in mesolow dynamic passive compensation with harmonic wave control field.
Brief description of the drawings
Fig. 1 is the electrical schematic diagram that three-phase imbalance comprehensive distribution box is automatically adjusted according to the utility model.
Fig. 2 is the first structure figure that three-phase imbalance comprehensive distribution box is automatically adjusted according to the utility model.
Fig. 3 is the second structure chart that three-phase imbalance comprehensive distribution box is automatically adjusted according to the utility model.
Main Reference Numerals explanation：
1st, 4,5,6- moulded case circuit breakers, 2,9- controlling switches, 3- master switch, 7- display screens, 8- static reacances hair
Raw device, 10,11- multifunctional electric energy meters, 12,13- shunt capacitances.
Embodiment
Below in conjunction with the accompanying drawings, embodiment of the present utility model is described in detail, it is to be understood that this practicality
New protection domain is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.
Fig. 1 to Fig. 3 is shown automatically adjusts three-phase imbalance overall power distribution according to the utility model preferred embodiment
The structural representation of case.
As shown in Figure 1 to Figure 3, automatically adjusting three-phase imbalance comprehensive distribution box includes：End of incoming cables, leading-out terminal is multi-functional
Electric energy meter 10,11, adjusts compensating module；The end of incoming cables of the distribution box is connected with three phase network, and end of incoming cables is provided with master switch (QS)
3；The leading-out terminal of the distribution box is connected by circuit with end of incoming cables, leading-out terminal be used for connect user or load, wherein, end of incoming cables with
The first obtaining current end, power taking pressure side and the second obtaining current end are sequentially provided between leading-out terminal；The first of multifunctional electric energy meter 10 takes
Sample end is accessed at the first obtaining current end by current transformer (measuring CT), the second sampling end and power taking press bond, is used for
Measurement, the operational factor of statistic for receiver case.
With continued reference to Fig. 1, regulation compensating module includes：Static reacance generator 8, idle compensating control, shunt capacitance
12nd, 13 and display screen 7；Wherein, static reacance generator 8 includes：Sub-controller, PWM signal generator and three phase inverter bridge；Son
The sampling end of controller is connected with the second obtaining current end；The input of PWM signal generator and the output end of sub-controller are connected；
The control end of three phase inverter bridge and the output end of PWM signal generator are connected.Two sampling ends difference of idle compensating control
With the second obtaining current end, power taking press bond, wherein, idle compensating control, sub-controller respectively by current transformer (i.e.
Sample CT) access at the second obtaining current end；Shunt capacitance 12,13 by the output end of controlling switch 2,9 and three phase inverter bridge (i.e.
The regulation output end of static reacance generator) line attachment in parallel, controlling switch 2,9 is preferred to use combination switch, controlling switch
2nd, 9 it is connected with the control end of idle compensating control；Wherein, connection end of incoming cables, leading-out terminal, regulation output end and compensation output
Moulded case circuit breaker (QF1, QF2, QF3, QF4) 1,4,5,6, connection controlling switch 2,9, regulation are equipped with the circuit at end
Miniature circuit breaker (ZK) is equipped with the circuit of output end and compensation output end；Display screen 7 respectively with sub-controller, reactive-load compensation
Controller is connected, for showing system data, service data, network wave, historical failure information etc., such as mains frequency, power network
Total harmonic distortion, grid current harmonic total harmonic distortion, load current total harmonic distortion, grid power factor, power network
Waveform etc..In addition, automatically adjusting three-phase imbalance comprehensive distribution box provided with lightning rod, concrete principle figure is referring to Fig. 1, distribution box tool
Body parts layout drawing is referring to Fig. 2 and Fig. 3.
Below, each principle of work and power to intelligent automatic regulated three-phase imbalance comprehensive distribution box is described in detail：
1st, sharing of load
Electric energy distributes to use by the master switch of inducer for line outlet end of transformer access device end of incoming cables by the outlet switch of leading-out terminal
Family or load, service entrance switch and every outlet switch all the way use moulded case circuit breaker, and outlet switch capacity is according to distribution
Capacity and power reguirements configuration, outlet way can be configured according to actual requirement.
2nd, electric energy metrical
Two ammeter positions are left in distribution box to be used to install the devices such as electric energy meter and acquisition terminal, for electric energy metrical work(
Can, continuous data is examined available for line loss.
3rd, distribution transformer monitoring
Multifunctional electric energy meter is installed as distribution transformer terminals and carries out distribution transforming and the measurement of integrated box operational factor, statistics, and is passed through
Distribution transforming on-line monitoring function is realized in data interaction with long-range main website system, is mainly included：
(1) collection three-phase voltage, electric current, realize voltage, electric current, active power, reactive power, power factor, active electricity
Amount, capacity of idle power, voltage, the measurement of current harmonics.
(2) data of electric energy meter are gathered.
(3) statistics rate of qualified voltage, power factor qualification rate.
(4) statistics power-on time, power off time, record stop/gone up the electric beginning and ending time.
4th, overload and short-circuit protection
Possesses overload or short-circuit protection function, when overload or short circuit, corresponding miniature circuit breaker or plastic casing type are disconnected
Road device disjunction is to reach defencive function.
5th, under-voltage protection
When the voltage of end of incoming cables or leading-out terminal drops to specified range, the device for under-voltage releasing equipment in moulded case circuit breaker
By breaking circuit breaker, under-voltage protection function is played.
6th, open-phase protection
Possess the moulded case circuit breaker at default-phase protection function, such as leading-out terminal phase shortage, leading-out terminal to disconnect, set user
It is standby not endangered by phase shortage.
7th, lightning protection
Zinc oxide surge arresters effectively prevent from damaging caused by Lightning Over-voltage and switching overvoltage in distribution box.If run into
Voltage, arrester turns on the introducing earthed system that will shove.
8th, aftercurrent action protecting
Possesses aftercurrent action protecting function (i.e. earth leakage protective) function.Residual current, plastics are gathered by distribution transformer terminals
Casing type circuit breaker carries out relevant action according to residual current value.
9th, reactive-load compensation
Static reacance generator is by sampled current transformer (sampling CT) real-time detecting system electric current, by the electricity detected
Stream information passes to internal sub-controller and analyzed.Sub-controller extracts basic reactive component among the electric current detected,
Then instruction, the IGBT actions of control three phase inverter bridge, so that static reacance generator is sent out are sent to PWM signal generator
Go out with system fundamental reactive component reactive current in opposite direction equal in magnitude, reach eliminate System Reactive Power electric current purpose.Dress
Put by the way of static reacance generator dynamic passive compensation and shunt capacitance cooperate, shunt capacitance is provided with the base of level
Plinth reactive-load compensation, static reacance generator module provides the dynamic passive compensation of fluctuation.The reactive current present in the system compared with
Hour, static reacance generator, which works independently, produces accurate enough reactive-load compensation electric currents；The reactive current present in the system compared with
When big, static reacance generator can not provide enough reactive-load compensation electric currents, and idle compensating control control combination switch is acted,
Parallel capacitive compensation starts input and worked with dynamic passive compensation module cooperative, and shunt capacitance provides the reactive-load compensation of Large Copacity,
And static reacance generator is then responsible for the precision and response speed of compensation.
10th, three-phase imbalance is adjusted
Static reacance generator is sent by sampled current transformer real-time detecting system electric current, and by system power information
Treatment Analysis is carried out to internal sub-controller, to judge whether system is in non-equilibrium state, equilibrium-like is reached while calculating
The current value of conversion needed for each phase during state, then sends a signal to the IGBT of the three phase inverter bridge of inside and drives it to act,
By out-of-balance current from electric current it is big be mutually transferred to the small phase of electric current, finally reach three-phase equilibrium state.
11st, harmonic wave control
Static reacance generator is filtered using the PWM technologies of bridge-type convertor circuit, by sending and Load harmonic
The opposite harmonic wave of size equidirectional is offseted therewith, so as to reach active power filtering, the effect of harmonic carcellation interference.
The intelligent automatic regulated three-phase imbalance comprehensive distribution box of this conceptual design, integrated sharing of load, electric energy metrical,
Outlet protection, residual current protecting, reactive-load compensation, capacitance compensation, dynamic reactive bidirectional compensating, three-phase imbalance regulation, improvement
The functions such as harmonic wave not only cover traditional all functions of overall power distribution box function, and add two-way reactive-load compensation, three in one
Mutually uneven Intelligent adjustment and filter function, can quickly track automatically the instantaneous compensating power size calculated needed for platform area and
Current waveform needed for three-phase imbalance, automatic precisely compensating power and adjustment current unbalance factor, is allowed to meet power network mark
It is accurate.Meanwhile, distribution box can compensate fundamental reactive current, and harmonic current can also be compensated, in mesolow dynamic reactive
Compensation is used widely with harmonic wave control field.
Compared to traditional LC filter circuits, the static reacance of intelligent automatic regulated three-phase imbalance comprehensive distribution box occurs
Device mainly has the advantages that idle compensatory energy is excellent, supports compensation unbalanced load and compensation neutral harmonic current, and these are all
Function not available for the compensation circuit of traditional reactive-load compensation loop composition.Compared with SVC (thuristor throw-in and throw-off reactive-load compensation),
With stable, long lifespan, response is fast, range of operation is big, capacity regulating is smoother, harmonic content is smaller, system voltage is more steady
The advantage such as fixed.
Whereby, compared with traditional comprehensive distribution box, install static reacance generator module additional, combine traditional overall power distribution
Case, three-phase imbalance regulation harmonic abatement functions so that the investment of equipment always is lower, and not extra land occupation, installation are applied
It is short between man-hour, reduce loss of outage；The three-phase imbalance of low-voltage platform area generally existing is efficiently solved the problems, such as, load is improved
Three-phase imbalance, power factor will be enhanced, and the loss occurred on circuit and distribution transforming will also decrease, while can also carry
The actual electric power of high distribution transforming.
The foregoing description to specific illustrative embodiment of the present utility model be in order to illustrate and illustration purpose.These
Description is not wishing to being defined to the utility model into disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can carry out
It is many to change and change.The purpose of selecting and describing the exemplary embodiment is that explaining certain principles of the present utility model
And its practical application, so that those skilled in the art can realize and utilize a variety of examples of the present utility model
Property embodiment and a variety of selections and change.Scope of the present utility model is intended to by claims and its waits similar shape
Formula is limited.
Claims (9)
1. one kind automatically adjusts three-phase imbalance comprehensive distribution box, it is characterised in that including：
End of incoming cables, it is connected with three phase network；
Leading-out terminal, it is connected by circuit with the end of incoming cables, wherein, first is provided between the end of incoming cables and the leading-out terminal
Obtaining current end, power taking pressure side and the second obtaining current end；
Multifunctional electric energy meter, its first sampling end is accessed at the first obtaining current end, the second sampling end and the power taking pressure side
Connection；And
Compensating module is adjusted, it includes：
Static reacance generator, its sampling end is connected with the second obtaining current end；
Idle compensating control, two sampling end respectively with the second obtaining current end, power taking press bond；And
Shunt capacitance, it compensates output end and passes through controlling switch access in parallel with the regulation output end of the static reacance generator
The circuit, wherein, the controlling switch is connected with the control end of the idle compensating control.
2. according to claim 1 automatically adjust three-phase imbalance comprehensive distribution box, it is characterised in that the static reacance
Generator includes：
Sub-controller, its sampling end is connected with the second obtaining current end；
PWM signal generator, its input is connected with the output end of the sub-controller；And
Three phase inverter bridge, its control end is connected with the output end of the PWM signal generator, and output end accesses the circuit.
3. according to claim 1 automatically adjust three-phase imbalance comprehensive distribution box, it is characterised in that the connection inlet wire
End, leading-out terminal with, regulation output end and compensate output end circuit on be equipped with moulded case circuit breaker.
4. according to claim 1 automatically adjust three-phase imbalance comprehensive distribution box, it is characterised in that the multi-functional electricity
First sampling end of energy table is accessed at the first obtaining current end by current transformer.
5. according to claim 2 automatically adjust three-phase imbalance comprehensive distribution box, it is characterised in that the reactive-load compensation
Controller, sub-controller are accessed at the second obtaining current end by current transformer respectively.
6. according to claim 2 automatically adjust three-phase imbalance comprehensive distribution box, it is characterised in that the connection control
Miniature circuit breaker is equipped with the circuit of switch, regulation output end and compensation output end.
7. according to claim 1 automatically adjust three-phase imbalance comprehensive distribution box, it is characterised in that the end of incoming cables is set
There is master switch.
8. according to claim 1 automatically adjust three-phase imbalance comprehensive distribution box, it is characterised in that also including automatic tune
Save three-phase imbalance comprehensive distribution box and be provided with lightning rod.
9. according to claim 1 automatically adjust three-phase imbalance comprehensive distribution box, it is characterised in that also including a display
Screen, the display screen is connected with the sub-controller, idle compensating control respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621168369.4U CN206364515U (en) | 2016-11-02 | 2016-11-02 | One kind automatically adjusts three-phase imbalance comprehensive distribution box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621168369.4U CN206364515U (en) | 2016-11-02 | 2016-11-02 | One kind automatically adjusts three-phase imbalance comprehensive distribution box |
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| CN206364515U true CN206364515U (en) | 2017-07-28 |
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ID=59369149
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| CN201621168369.4U Active CN206364515U (en) | 2016-11-02 | 2016-11-02 | One kind automatically adjusts three-phase imbalance comprehensive distribution box |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107240920A (en) * | 2017-07-31 | 2017-10-10 | 江苏振光电力设备制造有限公司 | A kind of MEC electric imitatings frock |
| CN107276086A (en) * | 2017-07-31 | 2017-10-20 | 江苏振光电力设备制造有限公司 | A kind of comprehensive power quality Optimized Simulated equipment |
| CN108333400A (en) * | 2018-03-19 | 2018-07-27 | 秦峥 | A kind of intelligent metering case and its application |
| CN113162057A (en) * | 2021-03-30 | 2021-07-23 | 国网河北省电力有限公司雄安新区供电公司 | Intelligent ammeter box and control method thereof |
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2016
- 2016-11-02 CN CN201621168369.4U patent/CN206364515U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107240920A (en) * | 2017-07-31 | 2017-10-10 | 江苏振光电力设备制造有限公司 | A kind of MEC electric imitatings frock |
| CN107276086A (en) * | 2017-07-31 | 2017-10-20 | 江苏振光电力设备制造有限公司 | A kind of comprehensive power quality Optimized Simulated equipment |
| CN108333400A (en) * | 2018-03-19 | 2018-07-27 | 秦峥 | A kind of intelligent metering case and its application |
| CN113162057A (en) * | 2021-03-30 | 2021-07-23 | 国网河北省电力有限公司雄安新区供电公司 | Intelligent ammeter box and control method thereof |
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