CN106451500A - Inter-phase load transfer terminal device based on transient waveform fitting - Google Patents
Inter-phase load transfer terminal device based on transient waveform fitting Download PDFInfo
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- CN106451500A CN106451500A CN201610907505.5A CN201610907505A CN106451500A CN 106451500 A CN106451500 A CN 106451500A CN 201610907505 A CN201610907505 A CN 201610907505A CN 106451500 A CN106451500 A CN 106451500A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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
The invention provides an inter-phase load transfer terminal device based on transient waveform fitting. The terminal device comprises an AC main circuit module, a sampling module, an instruction operation module and a master control module, the master control module is connected with the sampling module and the instruction operation module, and the sampling module and the instruction operation module are connected with the AC main circuit module. The terminal device can realize inter-phase load transfer rapidly in the commutation process, and prevent users from power failure; and the instant currents of a disconnecting point and a closing point are zero in commutation, larger impact current is avoided, inter-phase load transfer is smooth, and impact on a commutation device and an electric appliance is reduced. The terminal device aims at reducing the power loss and low voltage problems and further solving the problem single-phase overload of a distribution transformer by adjusting three-phase load imbalance of the distribution transformer and a low-voltage line automatically.
Description
Technical field
The present invention relates to low-voltage distribution and field of energy-saving technology, particularly to a kind of alternate negative based on transient-wave matching
Idling moves terminal installation.
Background technology
Generally comprise A phase, B phase, C phase three-phase phase line and zero line in current low-voltage circuit, if three-phase circuit is negative
Lotus is uneven, then distribution transformer and the electric energy loss of low-voltage circuit can be caused to increase, and may cause low-voltage problem, very
To the single-phase winding burning transformer.
Currently, the method that three-phase load unbalance automatically adjusts has mains side alternate flying capcitor method, dynamic reactive to mend
Compensation method, load-side load transfer method etc..Wherein, the principle of alternate flying capcitor method is by bridging on low-voltage bus bar
Capacitor, from the lighter phase shunt current of the heavier opposite duty ratio of load, makes distribution low-voltage export three-phase current substantially flat
Weighing apparatus.The advantage of the method is that adjusting means is fairly simple, installs more convenient, shortcoming is to adjust distribution transformer three-phase electricity
The imbalance of stream is it is impossible to adjust the three-phase current unbalance of low-voltage circuit.Dynamic reactive rate compensation method is to research and develop in recent years
New method, its principle is similar to alternate flying capcitor method, and its advantage is both to have adjusted current imbalance, also adjusts voltage uneven
Weighing apparatus.The advantage of the method is multiple functional, adjusts fine, fast response time, shortcoming is also to adjust distribution transformer three-phase
The imbalance of electric current is it is impossible to adjust the three-phase current unbalance of low-voltage circuit, and device power dissipation ratio itself is higher, and cost compares
High.
The principle of load-side load transfer method is using several automatic commutations being installed on single-phase user's branched line eventually
End, by User Part load from load heavier be mutually automatically transferred to the lighter phase of duty ratio, thus realizing distribution transformer
Outlet and circuit three-phase current are in a basic balance, and the method can reduce the electric energy loss of transformer, can reduce the electric energy of circuit again
Loss, and cost is than relatively low.
The alternate load transfer method commonly used at present is using zero passage phase-selecting method, that is, in ABC three-phase circuit, works as load
This phase of disjunction during the current waveform zero passage of heavier current phase, closes when the lighter target phase voltage waveform zero passage of duty ratio
This phase.The problem of the method is, after circuit disjunction, there is induced electromotive force in load side electrical circuitry, when target phase voltage mistake
When zero, the voltage of closing point is simultaneously not zero, and circuit closes moment, the larger electric current of meeting producing ratio, and electrical equipment or electrical equipment are produced
The raw larger impact of ratio, or produce switching overvoltage, the normal use of impact electrical equipment, or lead to the quality of power supply to decline.
Content of the invention
The purpose of embodiment of the present invention is to provide a kind of alternate load transfer terminal dress based on transient-wave matching
Put, can quickly realize alternate load transfer in commutation operating process, it is to avoid user has a power failure；Being capable of disjunction in commutation operation
Point and closing point immediate current are equal to zero, it is to avoid produce larger dash current, realize alternate load smooth transfer, reduce exchange
Phase device body and the impact of electrical equipment.Purpose is by the three-phase load of adjust automatically distribution transformer and low-voltage circuit not
Balance, reduces electric energy loss, less low-voltage problem, solves the problems, such as distribution transformer one-phase overload.
For achieving the above object, the present invention provides a kind of alternate load transfer terminal installation based on transient-wave matching,
Described terminal installation includes exchanging main circuit module, sampling module, command operating module and main control module, and described main control module divides
It is not connected with described sampling module, command operating module, described sampling module is also exchanged with described with described command operating module
Main circuit module is connected, wherein：Described exchange main circuit module includes power supply lateral circuit, on-off circuit and load side electrical circuitry, institute
State power supply lateral circuit and include A circuitry phase in parallel, B circuitry phase, C circuitry phase, described on-off circuit includes and each circuitry phase phase
Corresponding bidirectional triode thyristor in parallel and magnetic latching relay, wherein, each bidirectional triode thyristor is connected with control circuit, described negative
Carry lateral circuit and include current transformer, voltage transformer and load-side lead-out terminal；Described A circuitry phase, B circuitry phase, C circuitry phase
Structure identical, all include input terminal and voltage transformer；Described sampling module is used for gathering electricity in described load side electrical circuitry
The current signal of current transformer and the voltage signal gathering voltage transformer in described current circuitry phase；Described command operating mould
Block is used for transmitting the conducting triggering command that described main control module is assigned, described instruction behaviour to the control circuit of each bidirectional triode thyristor
It is additionally operable to transmit, to each magnetic latching relay, disjunction instruction or the close command that described main control module is assigned as module.
Further, described A circuitry phase, B circuitry phase, C circuitry phase also include fuse or air switch.
Further, described terminal installation also includes power module, data memory module and display keyboard circuit module, its
In, described power module is used for powering for the modules in described terminal installation, described display keyboard circuit module and described
Data memory module is all connected with described main control module.
Further, the control circuit of described bidirectional triode thyristor is passing zero trigger and the circuit crossing zero to cut-off.
Further, described terminal installation also includes the communication interface modules being connected with described main control module, described communication
Interface module is used for receiving the commutation instruction switching from current circuitry phase to target circuitry phase, and described commutation instruction is sent extremely
Described main control module.
The technical scheme being provided from above embodiment of the present invention, embodiment of the present invention is by load side electrical circuitry
The current signal of middle current transformer is detected and is utilized the operating characteristic of bidirectional triode thyristor, such that it is able in current signal
To currently mutually carrying out disjunction during zero passage.Additionally, after circuit disjunction, by voltage transformer in target phase and load-side electricity
In road, the voltage signal of voltage transformer is detected and is utilized the operating characteristic of bidirectional triode thyristor and its control circuit, thus
Can voltage in target circuitry phase equal with the voltage of load-side induced electromotive force when, target circuitry phase is closed, permissible
Ensure that the immediate current in target circuitry phase closing point is equal to zero.So just will not produce larger dash current in the line,
So as to protect electrical equipment.
Brief description
Fig. 1 is the voltage oscillogram after alternating current circuit disjunction in embodiment of the present invention；
Fig. 2 is the commutation process oscillogram in embodiment of the present invention from A phase to B phase；
Fig. 3 is the commutation process oscillogram in embodiment of the present invention from A phase to C phase；
Fig. 4 is that in embodiment of the present invention, the alternate load based on transient-wave matching shifts the structural representation of terminal installation
Figure；
Fig. 5 is the circuit diagram exchanging main circuit module in embodiment of the present invention.
Specific embodiment
In order that those skilled in the art more fully understand the technical scheme in the present invention, real below in conjunction with the present invention
Apply the accompanying drawing in mode, the technical scheme in embodiment of the present invention is clearly and completely described it is clear that described
Embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment party in the present invention
Formula, all other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, all answer
When belonging to the scope of protection of the invention.
The present invention provides a kind of alternate load transfer terminal installation based on transient-wave matching.Referring to accompanying drawing 4,5, described
Terminal installation includes exchanging main circuit module 1, sampling module 3, command operating module 4, main control module 6 and communication interface modules 8,
Described main control module 6 is connected with described communication interface modules 8, sampling module 3, command operating module 4 respectively, described sampling module
3 are also connected with the described main circuit module 1 that exchanges with described command operating module 4.
In the present embodiment, described exchange main circuit module 1 includes power supply lateral circuit, on-off circuit and load-side electricity
Road, wherein, described power supply lateral circuit include parallel connection A circuitry phase, B circuitry phase, C circuitry phase, described on-off circuit include with
The bidirectional triode thyristor 14,19,114 of the corresponding parallel connection of each circuitry phase and magnetic latching relay 15,110,115, wherein, each pair
It is connected to controllable silicon with control circuit.Described control circuit is used for controlling corresponding bidirectional triode thyristor on or off.Described negative
Carry lateral circuit and include current transformer 116, voltage transformer 117 and load-side lead-out terminal 118, described A circuitry phase, B phase are electric
Road, C circuitry phase structure identical, all include input terminal 11,16,111 and voltage transformer 13,18,113.In this embodiment party
In formula, the control circuit of described bidirectional triode thyristor be passing zero trigger and cross zero to cut-off circuit.
Refer to Fig. 1.In the present embodiment, the voltage signal in each circuitry phase is sinusoidal waveform.In three-phase circuit
Voltage signal phase place be difference 120 °.In synchronization, a circuitry phase can only be had to be in closure state, other two phases
Circuit is in disjunction state.Assume that current A circuitry phase is in closure state, B phase and C circuitry phase are in disjunction state.So work as A
Circuitry phase, after sometime disjunction, can produce induced electromotive force in load-side, the dotted line in Fig. 1 is the ripple of induced electromotive force
Shape.From figure 1 it appears that the induced electromotive force producing in load-side after A circuitry phase disjunction elapse over time can be gradually
Decay to 0.
Refer to accompanying drawing 2, the moment of current signal 200 zero crossing of A circuitry phase is T0 and T2, the voltage letter of A circuitry phase
The moment of numbers 100 zero crossing is T1.From Figure 2 it can be seen that in the T1 moment, when voltage signal 100 zero passage, current signal 200 is simultaneously
It is not zero.Therefore, if in T1 moment disjunction A circuitry phase, then breakpoint still has larger electric current.In present embodiment
In, can be in the T2 moment, that is, disjunction A circuitry phase during current signal 200 zero passage, the immediate current of breakpoint is equal to zero.And
Induced electromotive force as shown in phantom in Figure 2 now can also be produced in load side electrical circuitry.In order in B circuitry phase closing point,
The voltage of power supply lateral circuit can be identical with the induced electromotive force voltage of load side electrical circuitry, can in the T3 moment as shown in Figure 2,
B circuitry phase is namely closed with B circuitry phase when the voltage waveform 300 that the voltage waveform of induced electromotive force is inputted intersects.So,
During B circuitry phase closure, the voltage of mains side is equal with the voltage of load-side, thus the immediate current of closing point is equal to zero.In B phase
After closing of circuit, in circuit, just can produce B phase current 500.
Similarly, refer to Fig. 3, after A circuitry phase disjunction, can in the T4 moment, that is, load-side induct electronic
When the voltage waveform 400 that the voltage waveform of gesture is inputted with C circuitry phase intersects, close C circuitry phase, so that the moment of closing point
Electric current is equal to zero.After C circuitry phase closure, in circuit, just can produce C phase current 600.
Referring to accompanying drawing 4,5.In the present embodiment, described communication interface modules 8 is used for receiving from current circuitry phase to mesh
The commutation instruction of mark circuitry phase switching, and described commutation instruction is sent to described main control module 6.It is assumed for convenience of description that
Described is mutually currently A phase, and described target phase is B phase.So, described main control module 6 will pass through sampling module and gathers described load
The current signal of current transformer 116 and the voltage letter gathering voltage transformer 13 in described current circuitry phase in lateral circuit
Number.
In the present embodiment, when disjunction is carried out to A circuitry phase, described load side electrical circuitry is gathered by sampling module 3
The current signal of middle current transformer 116 and the voltage signal gathering voltage transformer 13 in described current circuitry phase.Work as inspection
Measure current waveform 200 as shown in Figure 2 from being just changed into when 0 (T0 point in fig. 2), due to the control of bidirectional triode thyristor 14
Circuit has the characteristic of passing zero trigger, and therefore when electric current is 0, bidirectional triode thyristor 14 is triggered and leads the conducting of its control circuit then
Logical.After bidirectional triode thyristor 14 turns on, main control module 6 will pass through command operating module 4 and assigns point to magnetic latching relay 15
Severed finger makes, thus the main contacts S and auxiliary node K of disjunction magnetic latching relay 15.So, A circuitry phase will pass through two-way controlled
Silicon 14 turns on.
In the present embodiment, when the current waveform 200 detecting in Fig. 2 from negative be changed into 0 when (in the T2 point of Fig. 2),
Main control module 6 can assign cutoff command by command operating module 4 to the control circuit of bidirectional triode thyristor 14.So, in Fig. 2
The current waveform 200 zero crossing T2 moment, bidirectional triode thyristor 14 and its control circuit due to having the characteristic of zero to cut-off, thus
Can end.So, A circuitry phase just can the disjunction in current waveform 200 zero passage.
In the present embodiment, when carrying out closed procedure to B circuitry phase, main control module 6 must be in the corresponding magnetic of A circuitry phase
Guard relay 15 is in disjunction state, and when the electric current of load-side current transformer 116 is 0, by command operating module 4
Control circuit to bidirectional triode thyristor 19 assigns turn-on command, and the control circuit due to bidirectional triode thyristor 19 has passing zero trigger
Characteristic, so when in T3 moment, B circuitry phase, mains side voltage is identical with load-side induced electromotive force voltage, load on two-way
The voltage at the control circuit two ends of controllable silicon 19 is identical, and that is, both end voltage is zero, the conducting of the control circuit of bidirectional triode thyristor 19 from
And so that bidirectional triode thyristor 19 is triggered conducting.So, B circuitry phase just can be energized.Subsequently, main control module 6 can be by instruction
Operation module 4 assigns close command to magnetic latching relay 110, such that it is able in the main contacts S of magnetic latching relay 110 and auxiliary
After helping node K closure, the control circuit of disjunction bidirectional triode thyristor 19, so, bidirectional triode thyristor 19 and its control circuit are just in mistake
Zero point is ended.B circuitry phase persistently can be energized by magnetic latching relay 110.
The commutation operating process of above-mentioned " from A phase to B phase " is equally applicable to " from B phase to C phase " and " from C phase to A phase "
The commutation operation that 120 ° of two-phase phase difference.
Commutation behaviour for 240 ° of the two-phase phase difference of " from A phase to C phase ", " from C phase to B phase " and " from B phase to A phase "
Make, its breaking course is consistent with above-mentioned breaking course, and taking from A phase to C phase as a example, its closing course is as described below：
Refer to Fig. 3, main control module 6 must be in disjunction state in the corresponding magnetic latching relay of A circuitry phase 15, and bears
When the electric current carrying side current transformer 116 is for 0, is assigned to the control circuit of bidirectional triode thyristor 114 by command operating module 4 and lead
Logical instruction, because the control circuit of bidirectional triode thyristor 114 has the characteristic of passing zero trigger, so electricity in T4 moment, C circuitry phase
When Source side voltage is identical with load-side induced electromotive force voltage, load on the voltage at the control circuit two ends of bidirectional triode thyristor 114
Identical, that is, both end voltage is zero, control circuit conducting conducting thus bidirectional triode thyristor 114 is triggered of bidirectional triode thyristor 114.This
Sample, C circuitry phase just can be energized.Subsequently, main control module 6 can be assigned to magnetic latching relay 115 by command operating module 4
Close command, such that it is able to magnetic latching relay 115 main contacts S and auxiliary node K close after, disjunction bidirectional triode thyristor
114 control circuit, so, bidirectional triode thyristor 114 and its control circuit are just ended in zero crossing.C circuitry phase can be protected by magnetic
Hold relay 115 to be persistently energized.
Therefore, described command operating module 4 is used for transmitting described master control to the control circuit of each bidirectional triode thyristor
The conducting triggering command that module is assigned, described command operating module is additionally operable to transmit described master control mould to each magnetic latching relay
Disjunction instruction or close command that block is assigned.
In one embodiment of the present invention, described A circuitry phase, B circuitry phase, C circuitry phase also include fuse 12,17,
112, described fuse can limit to the maximum current in each circuitry phase, when in circuit, electric current exceedes KB limit
When, fuse will fuse, thus the electronic device in protection circuit is without damage.Described fuse may be replaced by air
Switch.
In one embodiment of the present invention, described terminal installation also includes power module 2, data memory module 5 and shows
Show keyboard circuit module 7, wherein, described power module 2 is used for powering for the modules in described terminal installation, described display
Keyboard circuit module 7 is all connected with described main control module 6 with described data memory module 5.Wherein, described display keyboard circuit mould
, as main control module 6 and extraneous interactive module, user is by described display keyboard circuit module 7 to described main control module 6 for block 7
Assign various instructions, described main control module 6 displays to the user that the items of present apparatus also by described display keyboard circuit module 7
Parameter.Described data memory module 5 then stores the data that terminal installation produces in carrying out data handling procedure.
The technical scheme being provided from above embodiment of the present invention, embodiment of the present invention is by load side electrical circuitry
The current signal of middle current transformer is detected and is utilized the operating characteristic of bidirectional triode thyristor and its control circuit, thus
To currently mutually carrying out disjunction during current signal zero passage.Additionally, after circuit disjunction, by voltage transformer in target phase and
In load side electrical circuitry, the voltage signal of voltage transformer is detected and is utilized the work of bidirectional triode thyristor and its control circuit
Characteristic, thus when the voltage in target circuitry phase is equal with the voltage of load-side induced electromotive force, target circuitry phase is closed,
It is zero so in closing point immediate current, just will not produce greater impact electric current in the line such that it is able to protect electrical equipment.
Description to the various embodiments of the present invention is supplied to those skilled in the art with the purpose describing above.This
Bright various replacements and change will be apparent from for above-mentioned technology one of ordinary skill in the art.Therefore although
Through specifically discuss the embodiment of some alternatives, but other embodiment will be apparent from, or art technology
Personnel relatively easily draw.It is contemplated that including all replacements of the present invention, modification and the change that here had discussed,
And the other embodiment falling in the spirit and scope of above-mentioned application.
Claims (5)
1. a kind of alternate load transfer terminal installation based on transient-wave matching, described terminal installation includes exchanging main circuit mould
Block, sampling module, command operating module and main control module it is characterised in that described main control module respectively with described sampling module,
Command operating module is connected, and described sampling module is also connected with the described main circuit module that exchanges with described command operating module, its
In：
Described exchange main circuit module includes power supply lateral circuit, on-off circuit and load side electrical circuitry, and described power supply lateral circuit includes
The A circuitry phase of parallel connection, B circuitry phase and C circuitry phase, described on-off circuit includes the two-way of the parallel connection corresponding with each circuitry phase
Controllable silicon and magnetic latching relay, wherein, each bidirectional triode thyristor is connected with control circuit, and described load side electrical circuitry includes electric current
Transformer, voltage transformer and load-side lead-out terminal；Described A circuitry phase, B circuitry phase, C circuitry phase structure identical, all wrap
Include input terminal and voltage transformer；
Described sampling module is described current for gathering the current signal of current transformer and collection in described load side electrical circuitry
The voltage signal of voltage transformer in circuitry phase；
Described command operating module is used for transmitting, to the control circuit of each bidirectional triode thyristor, the conducting that described main control module is assigned
Triggering command, the disjunction that described command operating module is additionally operable to assign to each magnetic latching relay described main control module of transmission refers to
Order or close command.
2. terminal installation according to claim 1 is it is characterised in that described A circuitry phase, B circuitry phase, C circuitry phase also wrap
Include fuse or air switch.
3. terminal installation according to claim 1 is it is characterised in that described terminal installation also includes power module, data
Memory module and display keyboard circuit module, wherein, described power module is used for supplying for the modules in described terminal installation
Electricity, described display keyboard circuit module is all connected with described main control module with described data memory module.
4. terminal installation according to claim 1 is it is characterised in that the control circuit of described bidirectional triode thyristor is led for zero passage
Circuit that is logical and crossing zero to cut-off.
5. terminal installation according to claim 1 is it is characterised in that described terminal installation also includes and described main control module
Connected communication interface modules, described communication interface modules is used for receiving the commutation switching from current circuitry phase to target circuitry phase
Instruction, and described commutation instruction is sent to described main control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610907505.5A CN106451500B (en) | 2016-10-18 | 2016-10-18 | Interphase load transfer terminal device based on transient waveform fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610907505.5A CN106451500B (en) | 2016-10-18 | 2016-10-18 | Interphase load transfer terminal device based on transient waveform fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106451500A true CN106451500A (en) | 2017-02-22 |
| CN106451500B CN106451500B (en) | 2019-12-27 |
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ID=58177084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610907505.5A Active CN106451500B (en) | 2016-10-18 | 2016-10-18 | Interphase load transfer terminal device based on transient waveform fitting |
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| Country | Link |
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| CN (1) | CN106451500B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653316A (en) * | 2017-01-18 | 2017-05-10 | 广西柳州特种变压器有限责任公司 | Single-phase power supply system of three-phase transformer |
| WO2022162415A1 (en) * | 2021-01-26 | 2022-08-04 | Multicharge Oü | A multiphaser device and method for uninterrupted ac power switching between sources of same or different phases |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023001378A1 (en) * | 2021-07-22 | 2023-01-26 | Hitachi Energy Switzerland Ag | Hybrid phase selector |
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| CN201523347U (en) * | 2009-09-22 | 2010-07-07 | 新疆特变（集团）有限公司 | Intelligent type combination switch |
| CN201830223U (en) * | 2010-10-29 | 2011-05-11 | 山东泰华电讯有限责任公司 | Active and passive combined power switch |
| CN102904270A (en) * | 2012-11-05 | 2013-01-30 | 镇江长河电力技术有限公司 | Three-phase current unbalance adjusting system for power distribution network |
| CN105914763A (en) * | 2016-05-23 | 2016-08-31 | 江苏华奥科自动化技术有限公司 | Novel intelligent phase change switch and method for distribution network |
| CN206135427U (en) * | 2016-10-18 | 2017-04-26 | 泰豪科技股份有限公司 | Alternate load transfer terminating set based on match of transient state wave form |
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| CN201523347U (en) * | 2009-09-22 | 2010-07-07 | 新疆特变（集团）有限公司 | Intelligent type combination switch |
| CN201830223U (en) * | 2010-10-29 | 2011-05-11 | 山东泰华电讯有限责任公司 | Active and passive combined power switch |
| CN102904270A (en) * | 2012-11-05 | 2013-01-30 | 镇江长河电力技术有限公司 | Three-phase current unbalance adjusting system for power distribution network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106653316A (en) * | 2017-01-18 | 2017-05-10 | 广西柳州特种变压器有限责任公司 | Single-phase power supply system of three-phase transformer |
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| WO2022162415A1 (en) * | 2021-01-26 | 2022-08-04 | Multicharge Oü | A multiphaser device and method for uninterrupted ac power switching between sources of same or different phases |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106451500B (en) | 2019-12-27 |
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