CN106160506A - Novel low-voltage increasing apparatus and collocation method - Google Patents
Novel low-voltage increasing apparatus and collocation method Download PDFInfo
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- CN106160506A CN106160506A CN201610685899.4A CN201610685899A CN106160506A CN 106160506 A CN106160506 A CN 106160506A CN 201610685899 A CN201610685899 A CN 201610685899A CN 106160506 A CN106160506 A CN 106160506A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
Abstract
The invention provides novel low-voltage increasing apparatus, comprise shell, low-voltage boost module is installed in shell；The CPU control unit output of low-voltage boost module is connected with the input of IGBT drive circuit, and exports the control signal controlling IGBT inverter circuit inverter mode；The output of IGBT drive circuit is corresponding with the control end of each IGBT in IGBT inverter circuit to be connected；The output of IGBT inverter circuit is connected with the input of inversion plastic filter circuit；The output of inversion plastic filter circuit is connected with the former limit of compensator transformer；The homophase input terminal of the input of compensator transformer secondary phase line connected with input phase monitoring means is connected, and the outfan of the secondary of compensator transformer is connected with the phase line outlet terminal of corresponding homophase；The input of described current rectifying and wave filtering circuit is connected with the phase line outlet terminal of zero line outlet terminal and corresponding homophase respectively；The method have the advantages that: improve rate of qualified voltage, reduce line loss.
Description
Technical field
The present invention relates to field of electrical equipment, be specifically related to the low-voltage increasing apparatus of field of power electronics.
Background technology
The outer research to power distribution network low-voltage problem of Current Domestic mainly from substation exit, distribution medium-voltage line, join
Four aspects such as piezoelectric transformer outlet and low-voltage circuit end are carried out, and the conventional low voltage for low-voltage circuit end is administered main
To administer by increasing the methods such as reactive power compensator and dynamic electric voltage rheonome at line end.And for China
Rural power grids for, owing to rural power grids structure is complicated, line style is various, user's dispersion, supply line are long, due on circuit
The pressure drop produced is excessive, causes terminal voltage on the low side；Especially when peak times of power consumption, backend user voltage may as little as 110～
150V or lower, now it cannot be guaranteed that the basic electricity demand of user；Along with deepening continuously of research, multiple new low-voltage is controlled
Reason technology is continuously available application, but the installation cost of some Treatment process or use is higher at present, such as uses newly-increased distribution
The method of transformator, its distribution transformer used and supporting equipment and wire rod are expensive, install complexity, human cost
Height, and need, by high pressure 10KV line outage, to be unsuitable at China's rural area spread；The process how to administer in low-voltage
The advantage of middle combination distinct methods to reach good effect, need we electrical network is administered have deeper into research and analysis.
Summary of the invention
For the deficiency in the presence of prior art, the invention provides joining of novel low-voltage increasing apparatus and this device
Put method, its object is to solve that low-voltage circuit end radius of electricity supply is longer, load on the low side the asking of the heavier terminal voltage caused
Topic.
For achieving the above object, present invention employs following technical scheme:
Novel low-voltage increasing apparatus, comprises shell, is provided with low-voltage boost module in shell；Low-voltage boost module
Include input terminal and outlet terminal, for outer phase-connecting wire and zero line；Described low-voltage boost module comprises input
Phase monitor unit, CPU control unit, IGBT drive circuit, IGBT inverter circuit, inversion plastic filter circuit, compensation transformation
Device and current rectifying and wave filtering circuit；Corresponding with zero line, the phase line respectively input terminal of the input of input phase monitoring means is connected, and uses
To detect phase information and to be passed to CPU control unit；The input phase of the output of CPU control unit and IGBT drive circuit
Connect, and export the control signal controlling IGBT inverter circuit inverter mode；The output of IGBT drive circuit and IGBT inverter circuit
In each IGBT control end correspondence be connected, with drive and realize the control to IGBT inverter circuit of the CPU control unit；IGBT inversion
The output of circuit is connected with the input of inversion plastic filter circuit；The energization input of IGBT inverter circuit and current rectifying and wave filtering circuit
Output correspondence be connected；The output of inversion plastic filter circuit is connected with the former limit of compensator transformer；Compensator transformer secondary
The homophase input terminal of input phase line connected with input phase monitoring means is connected, the outfan of the secondary of compensator transformer
It is connected with the phase line outlet terminal of corresponding homophase；The input of described current rectifying and wave filtering circuit respectively with zero line outlet terminal and right
The phase line outlet terminal answering homophase is connected.
Further, low-voltage boost module also comprises output current monitoring unit and sampling feedback unit；Sampling feedback
The input of unit is in parallel with the input of current rectifying and wave filtering circuit, to obtain the voltage after compensator transformer；Sampling feedback
Another input of unit is connected with the output of output current monitoring unit；The output of sampling feedback unit and CPU control unit
Input is connected, in order to the voltage of acquisition, current information are transferred to CPU control unit；Described output current monitoring unit is connected to
Between current rectifying and wave filtering circuit and the outlet terminal of corresponding connection, it is used for detecting output electric current.
Further, described IGBT inverter circuit also includes the thermal-shutdown circuit for IGBT switch element, mistake
Stream protection circuit and short-circuit protection circuit.
Further, described sampling feedback unit includes the potentiometer for regulating feedback reference voltage, thus realizes
The regulation of output voltage.
Further, the display unit being connected with CPU control unit is also comprised.
The present invention also proposes a kind of collocation method based on novel low-voltage increasing apparatus, comprises the steps of and method:
A, selection peak times of power consumption voltage range position between 140V～198V are as New Low Voltage increasing apparatus
Preliminary election mount point；
B, transmission line length, line system, line footpath size and voltage condition according between preliminary election mount point to transformator obtain
Take the peak power that transmission line of electricity can be provided by, in conjunction with preliminary election mount point front end and the number of users of rear end and power load, adjust
Whole preliminary election mount point is to the distance between transformator；
C, according to mount point rear end peak period electricity consumption situation, the input voltage of mount point, and the line obtained by integrating step B
The peak power that road can be provided by, selects output voltage New Low Voltage increasing apparatus of corresponding power between 180V～220V,
And the maximum power load of preliminary election mount point rear end is less than the peak power of selected New Low Voltage increasing apparatus；
D, complete the installation of selected New Low Voltage increasing apparatus in mount point, and by the zero line of this device, ground wire terminals
It is connected to ground by spark gap.
The present invention, with cpu control circuit as control core, supervises by receiving and process sampling feedback unit and input phase
After surveying the signal of unit transmission, output is for controlling the signal of IGBT inverter circuit inverter mode；Obtained by current rectifying and wave filtering circuit
Voltage export after the inversion of IGBT inverter circuit, the process of inversion plastic filter circuit, become and input phase monitoring
The same phase sequence of the connected phase line of unit, the alternating current of same frequency, and be added to former electrical network by compensator transformer, thus play boosting
And the effect of voltage stabilizing；Thermal-shutdown circuit, current foldback circuit and short-circuit protection circuit is included in IGBT inverter circuit, and
In conjunction with sampling feedback unit, in the way of hardware and software combine, realize the protection of IGBT switch element.
The collocation method based on novel low-voltage increasing apparatus that the present invention proposes optimizes New Low Voltage increasing apparatus
Using effect, traditional increasing apparatus distance transformator is too far away or too close all can due to the transmission line of electricity of input side or outlet side relatively
Grow and produce and add lossy, the most do not consider the electricity consumption loading condition before and after mount point, too low at input voltage
Position is installed increasing apparatus and then can be fallen flat.
Compared to prior art, there is advantages that
, rear end in poor for power supply quality, unstable electrical network, play a part voltage stabilizing of boosting, improve voltage qualified
Rate, minimizing line loss, it is ensured that electrical network has reliable and stable power supply quality；Thus need not extend 10KV circuit, be not required to increase newly
Distribution transformer, and apparatus structure is simple, easy for installation, save a large amount of manpower and materials for power department and greatly reduce rural power grids and change
Make investment；
(2), use HF switch IGBT power supply, input voltage subject range width；
(3), it is provided with and IGBT element is carried out short circuit, overload and overheat protection function, to avoid the damage of IGBT；Simultaneously can
Judgment means and external environment condition abnormal conditions, such as line short, can protect the electrical equipment of this device and backend user immediately；
(4), rational collocation method makes that device is more efficiently to play a role.
Accompanying drawing explanation
Fig. 1 is that the structure of low-voltage boost module in embodiment connects logic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings and the technical scheme in the present invention is further illustrated by embodiment.
A kind of novel low-voltage increasing apparatus, comprises shell, is provided with low-voltage boost module in shell；Low-voltage is boosted
Module includes input terminal and outlet terminal, for outer phase-connecting wire and zero line；As it is shown in figure 1, described low-voltage liter
Die block comprises input phase monitoring means, CPU control unit, IGBT drive circuit, IGBT inverter circuit, inversion shaping filter
Circuit, compensator transformer, current rectifying and wave filtering circuit, output current monitoring unit, sampling feedback unit and display unit；Input phase
Corresponding with zero line, the phase line respectively input terminal of the input of monitoring means is connected, in order to detect phase information and to be transmitted
To CPU control unit；The output of CPU control unit is connected with the input of IGBT drive circuit, and exports control IGBT inversion electricity
The control signal of road inverter mode；Output and the corresponding phase of control end of each IGBT in IGBT inverter circuit of IGBT drive circuit
Even, to drive and to realize the control to IGBT inverter circuit of the CPU control unit；The output of IGBT inverter circuit is filtered with inversion shaping
The input of wave circuit is connected；The energization input of IGBT inverter circuit is corresponding with the output of current rectifying and wave filtering circuit to be connected；Inversion is whole
The output of shape filter circuit is connected with the former limit of compensator transformer；The input of compensator transformer secondary is single with input phase monitoring
The homophase input terminal of the connected phase line of unit is connected, and the outfan of the secondary of compensator transformer exports with the phase line of corresponding homophase and connects
Line end is connected；The input of described current rectifying and wave filtering circuit respectively with the phase line outlet terminal of zero line outlet terminal and corresponding homophase
It is connected；The input of sampling feedback unit is in parallel with the input of current rectifying and wave filtering circuit, to obtain after compensator transformer
Voltage；Another input of sampling feedback unit is connected with the output of output current monitoring unit；Sampling feedback unit output with
The input of CPU control unit is connected, in order to the voltage of acquisition, current information are transferred to CPU control unit；Described output electric current
Monitoring means is connected between current rectifying and wave filtering circuit and the outlet terminal of corresponding connection, is used for detecting output electric current；Display unit
It is connected with CPU control unit, circuit can be inputted, output voltage is shown intuitively by display unit, facilitates user to look into
See.
Described IGBT inverter circuit also includes the thermal-shutdown circuit for IGBT switch element, current foldback circuit
And short-circuit protection circuit, to avoid the damage of IGBT.
Described sampling feedback unit includes the potentiometer for regulating feedback reference voltage, thus realizes output voltage
Regulation.
This device, with cpu control circuit as control core, is supervised by receiving and process sampling feedback unit and input phase
After surveying the signal of unit transmission, output is for controlling the signal of IGBT inverter circuit inverter mode；Obtained by current rectifying and wave filtering circuit
Voltage export after the inversion of IGBT inverter circuit, the process of inversion plastic filter circuit, become and input phase monitoring
The same phase sequence of the connected phase line of unit, the alternating current of same frequency, and be added to former electrical network by compensator transformer, thus play boosting
And the effect of voltage stabilizing；Thermal-shutdown circuit, current foldback circuit and short-circuit protection circuit is included in IGBT inverter circuit, and
In conjunction with sampling feedback unit, in the way of hardware and software combine, realize the protection of IGBT switch element.
Using IGBT to constitute inverter circuit, current rectifying and wave filtering circuit and output current monitoring unit is all prior art, its tool
Body structure does not repeats them here.
The present embodiment also proposes a kind of collocation method based on novel low-voltage increasing apparatus, comprises the steps of and side
Method:
A, selection peak times of power consumption voltage range position between 140V～198V are as New Low Voltage increasing apparatus
Preliminary election mount point；
B, transmission line length, line system, line footpath size and voltage condition according between preliminary election mount point to transformator obtain
Take the peak power that transmission line of electricity can be provided by, in conjunction with preliminary election mount point front end and the number of users of rear end and power load, adjust
Whole preliminary election mount point is to the distance between transformator；
C, according to mount point rear end peak period electricity consumption situation, the input voltage of mount point, and the line obtained by integrating step B
The peak power that road can be provided by, selects output voltage New Low Voltage increasing apparatus of corresponding power between 180V～220V,
And the maximum power load of preliminary election mount point rear end is less than the peak power of selected New Low Voltage increasing apparatus；
D, complete the installation of selected New Low Voltage increasing apparatus in mount point, and by the zero line of this device, ground wire terminals
It is connected to ground by spark gap.
Step A when concrete operations, some districts cause because radius of electricity supply is longer backend user can not normal electricity consumption, with
Electricity peak period time, backend user voltage may as little as 110～150V or lower, now it cannot be guaranteed that user basic electricity need
Ask, such as illumination, see TV, startup water pumper and thresher etc.；For this situation, the mount point of regulator can be selected
Voltage is 140～170V (peak period voltage) place, after the boosting of regulator, output voltage can be brought up to 180～
230V, back end of line voltage also can bring up to 165～210V, and then ensure that the basic household electrical appliance of user are in peak times of power consumption
Can normally use；Some district's radius of electricity supplys are not the longest, but load is heavier, cause the rate of qualified voltage of back end of line user
On the low side；Regulator mount point in the case of this, may select at voltage is 170V～between the scope of 198V, to improve regulator
The rate of qualified voltage of backend user.
For step B working condition of regulator under the conditions of not synteny, line length and power load, refer to following
A～d series of tables, the parameter in form is based on the distribution transformer gained that rated output voltage is 220V, involved noun solution
Release as follows:
Line length: refer to the regulator mount point line-spacing to distribution transforming；
Power: be under the conditions of corresponding line length, line footpath and input voltage, the peak power that circuit can be provided by；
Input voltage/output voltage: refer to the input voltage/output voltage of novel low-voltage increasing apparatus；
A, 50 lines
B, 35 lines
C, 25 lines
D, 16 lines
In above-mentioned table, the result that four-wire system is calculated obtains based in the case of three-phase equilibrium, such as three-phase imbalance,
In the case of equal line length and power, input voltage will be lower than result of calculation, between two-wire system and four-wire system.
Data in table calculate during zero load situation before novel low-voltage increasing apparatus；And at practical situation
In, perhaps having certain load before increasing apparatus, input voltage will be lower than input voltage in table, first test pre-reconnaissance during reconnaissance
The input voltage of peak period, referring again to input voltage corresponding in table, can obtain expection output voltage.
It addition, the conversion translation method for the most collinear system is as follows:
Two-wire system length when four-wire system is converted into two-wire system, after four-wire system length is i.e. changed divided by 2；Two-wire system
When being converted into four-wire system, two-wire system length is multiplied by 2 just changed after four-wire system length；When regulator mount point is to joining
When change has multiple line style, multiple line style is converted to same line style length by the translation method that can refer to following table, and wherein left end is each
Line style before row correspondence conversion, in table, each row respective items is line style after conversion.
Example: a certain circuit is two-wire system from regulator mount point to distribution transforming, has 50 line 100m, 35 line 100m, 25 lines
200m, 16 line 200m.This circuit is all converted to from regulator mount point to distribution transforming 25 lines.According to upper table, method is as follows:
50 line 100m are converted to 25 lines: 100m × 0.53=53m
35 line 100m are converted to 25 lines: 100m × 0.72=72m
25 line 200m are converted to 25 lines: 200m × 1=200m
16 line 200m are converted to 25 lines: 200m × 1.59=318m
This circuit be all converted to after 25 lines from regulator mount point to distribution transforming a length of: 53m+72m+200m+
318m=643m
In 25 two-wire systems of table c, after finding the 650m line length close with 643m, it can be seen that pressure regulation dress with this understanding
The working condition put.
In step C, due to the seasonal and period feature of rural electricity consumption, in order to meet the basic electricity of back-end client
Demand, is generally transferred to the tap of distribution transforming the output of higher voltage, thus causes light load period first and end voltage the most higher super
The upper limit；And in period peak times of power consumption, head end voltage surpasses the upper limit, terminal voltage surpasses lower limit, causes rate of qualified voltage too low.Install
After regulator, can suitably turn down distribution transforming output voltage, when power load is lighter voltage will not superelevation, when power load concentrate
When causing brownout, voltage will be compensated by regulator automatically, it is ensured that the normal electricity consumption demand of user, thus improves use
The rate of qualified voltage of family end.
The collocation method based on novel low-voltage increasing apparatus that the present embodiment proposes optimizes New Low Voltage increasing apparatus
Using effect, traditional increasing apparatus distance transformator is too far away or too close all can be due to input side or the transmission line of electricity of outlet side
Longer and produce add lossy, the most do not consider the electricity consumption loading condition before and after mount point, too low at input voltage
Position install increasing apparatus then can fall flat.
Finally illustrating, above example is only in order to illustrate technical scheme and unrestricted, although with reference to relatively
The present invention has been described in detail by good embodiment, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, and without deviating from objective and the scope of technical solution of the present invention, it all should be contained at this
In the middle of the right of invention.
Claims (6)
1. novel low-voltage increasing apparatus, comprises shell, is provided with low-voltage boost module in shell；Low-voltage boost module bag
Containing input terminal and outlet terminal, for outer phase-connecting wire and zero line；It is characterized in that: described low-voltage boost module
Comprise input phase monitoring means, CPU control unit, IGBT drive circuit, IGBT inverter circuit, inversion plastic filter circuit,
Compensator transformer and current rectifying and wave filtering circuit；The input wires that the input of input phase monitoring means is corresponding with zero line, phase line respectively
End is connected, in order to detect phase information and to be passed to CPU control unit；The output of CPU control unit drives electricity with IGBT
The input on road is connected, and exports the control signal controlling IGBT inverter circuit inverter mode；The output of IGBT drive circuit with
In IGBT inverter circuit, the control end correspondence of each IGBT is connected, to drive and to realize CPU control unit to IGBT inverter circuit
Control；The output of IGBT inverter circuit is connected with the input of inversion plastic filter circuit；The energization input of IGBT inverter circuit
Output with current rectifying and wave filtering circuit is corresponding connected；The output of inversion plastic filter circuit is connected with the former limit of compensator transformer；Mend
The homophase input terminal of the input phase line connected with input phase monitoring means repaying transformer secondary is connected, compensator transformer
The phase line outlet terminal of outfan and corresponding homophase of secondary be connected；The input of described current rectifying and wave filtering circuit respectively with zero line
The phase line outlet terminal of outlet terminal and corresponding homophase is connected.
2. novel low-voltage increasing apparatus as claimed in claim 1, it is characterised in that: low-voltage boost module also comprises output
Current monitoring unit and sampling feedback unit；The input of sampling feedback unit is in parallel with the input of current rectifying and wave filtering circuit, to obtain
Learn from else's experience the voltage after overcompensation transformator；Another input of sampling feedback unit and the output phase of output current monitoring unit
Even；The output of sampling feedback unit is connected with the input of CPU control unit, in order to the voltage of acquisition, current information to be transferred to
CPU control unit；Described output current monitoring unit is connected between current rectifying and wave filtering circuit and the outlet terminal of corresponding connection, uses
In detection output electric current.
3. novel low-voltage increasing apparatus as claimed in claim 1 or 2, it is characterised in that: in described IGBT inverter circuit also
Include the thermal-shutdown circuit for IGBT switch element, current foldback circuit and short-circuit protection circuit.
4. novel low-voltage increasing apparatus as claimed in claim 3, it is characterised in that: described sampling feedback unit includes use
In the potentiometer of regulation feedback reference voltage, thus realize the regulation of output voltage.
5. novel low-voltage increasing apparatus as claimed in claim 4, it is characterised in that: also comprise and be connected with CPU control unit
Display unit.
6. collocation method based on the New Low Voltage increasing apparatus described in any one of claim 1 to 5, it is characterised in that comprise
Following steps or method:
A, select peak times of power consumption voltage range position between 140V～198V as the preliminary election of New Low Voltage increasing apparatus
Mount point；
B, transmission line length according between preliminary election mount point to transformator, line system, line footpath size and voltage condition obtain defeated
The peak power that electric line can be provided by, in conjunction with preliminary election mount point front end and the number of users of rear end and power load, adjusts pre-
Select mount point to the distance between transformator；
C, according to mount point rear end peak period electricity consumption situation, the input voltage of mount point, and the circuit institute obtained by integrating step B
The peak power being provided that, selection output voltage is the New Low Voltage increasing apparatus of corresponding power between 180V～220V, and in advance
Select the maximum power load peak power less than selected New Low Voltage increasing apparatus of mount point rear end；
D, complete the installation of selected New Low Voltage increasing apparatus in mount point, and the zero line of this device, ground wire terminals are passed through
Spark gap is connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610685899.4A CN106160506A (en) | 2016-08-18 | 2016-08-18 | Novel low-voltage increasing apparatus and collocation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610685899.4A CN106160506A (en) | 2016-08-18 | 2016-08-18 | Novel low-voltage increasing apparatus and collocation method |
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| CN106160506A true CN106160506A (en) | 2016-11-23 |
Family
ID=57330934
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| CN201610685899.4A Pending CN106160506A (en) | 2016-08-18 | 2016-08-18 | Novel low-voltage increasing apparatus and collocation method |
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| CN109888792A (en) * | 2019-04-28 | 2019-06-14 | 成都亿成科技有限公司 | A kind of contactless voltage and current regulator of power distribution network low-voltage circuit dynamic |
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Application publication date: 20161123 |