CN108365619A - Three-phase imbalance commutation device - Google Patents
Three-phase imbalance commutation device Download PDFInfo
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- CN108365619A CN108365619A CN201810413112.8A CN201810413112A CN108365619A CN 108365619 A CN108365619 A CN 108365619A CN 201810413112 A CN201810413112 A CN 201810413112A CN 108365619 A CN108365619 A CN 108365619A
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- 238000001514 detection method Methods 0.000 claims abstract description 27
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Classifications
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
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- H02J13/0006—
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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 discloses a kind of three-phase imbalance commutation devices, including：Current acquisition unit, main control unit, voltage zero-cross detection unit, thyristor cell and switch unit；Current acquisition unit acquires the electric current of three-phase；Main control unit exports commutation control signal also according to default commutation rule according to Current calculation tri-phase unbalance factor in voltage over zero；Thyristor cell includes driving circuit and thyristor, and thyristor connects each phase and single-phase load of three-phase；Switch unit includes mechanical switch and buckle releaser, and mechanical switch connects each phase and single-phase load of three-phase, and buckle releaser drives closure or the disconnection of mechanical switch.The monitoring of three-phase imbalance may be implemented in the present invention and the phase-change switch constituted by thyristor and by mechanical switch and buckle releaser carries out commutation, reach the quick commutation of not power down of single-phase load, also greatly to reduce electric arc in voltage over zero switching to improve safety and the service life of device.
Description
Technical field
The present invention relates to three-phase distribution technical field more particularly to a kind of three-phase imbalance commutation devices.
Background technology
In Distribution network system, there are a large amount of single-phase, asymmetric, non-linear, impact loads, due to early stage
Electrical reticulation design is planned inconsiderate, it may appear that the case where a large amount of single-phase loads concentrate on single-phase or two-phase, these unbalanced load meetings
So that distribution system is generated three-phase imbalance, leads to the imbalance of power supply system three-phase voltage, electric current.It is outstanding in Distribution network
It is in agricultural network due to the restriction of the factors such as circuit and distribution transformer is large number of, power supply user dispersion, fund cost,
Three-phase imbalance and unrealistic is solved the problems, such as by configuring the modes such as low-voltage reactive compensator.Usual way is to pass through people
The power supply of work switching single-phase load mutually adjusts three-phase equilibrium, but this mode needs first to operate load power failure again, this
The power supply reliability to user has been seriously affected, challenge is proposed to the quality supply of power grid.Therefore, how single-phase load to be made to exist
It is a problem to be solved that commutation operation is completed in the case of not power down.
Invention content
In view of the above problems, the present invention proposes a kind of three-phase imbalance commutation device, for detecting three-phase imbalance situation
And commutation is carried out by thyristor and mechanical switch etc., to solve to complete switching circuit in the case of single-phase load not power down
Problem.
A kind of three-phase imbalance commutation device proposed by the present invention, including：Current acquisition unit, main control unit, voltage mistake
Zero detection unit, thyristor cell and switch unit；
The current acquisition unit is used to acquire the electric current of three-phase；
The voltage zero-cross detection unit is used to detect the voltage over zero of each phase；
The main control unit is used for according to the Current calculation tri-phase unbalance factor, if the tri-phase unbalance factor is more than pre-
If threshold value, then corresponding commutation is exported in the voltage over zero of corresponding phase line according to default commutation rule and control signal；If described
Tri-phase unbalance factor is not above the predetermined threshold value, then does not export the commutation control signal；
The thyristor cell includes driving circuit and thyristor, and the thyristor is used to connect each mutually and single-phase of three-phase
Load, the driving circuit are used to control shutdown or the opening that signal drives the thyristor according to the commutation；
The switch unit includes mechanical switch and buckle releaser, the mechanical switch be used to connect the three-phase it is each mutually with
The single-phase load, the buckle releaser be used for according to the commutation control signal drive the mechanical switch closure or disconnect from
And switch the access phase line of the single-phase load.
Optionally, three-phase imbalance commutation device of the invention further includes：Timing trigger unit, the timing trigger unit
It connect with the current acquisition unit, is timed for timing output current acquisition signal with triggering the current acquisition unit
Acquisition.The electric current of three-phase is acquired by clocked flip the case where detecting three-phase imbalance, can reduce the monitoring work(of whole device
Consumption.
Optionally, three-phase imbalance commutation device of the invention further includes：Communication unit, described in communication unit connection
Main control unit also receives the control command of remote terminal for the information of the electric current to be sent to remote terminal.
Optionally, three-phase imbalance commutation device of the invention further includes：Protection location, the protection location are opened with described
It closes unit to connect with the single-phase load, for protecting the single-phase load when short circuit or overcurrent occur for circuit.
Optionally, the current acquisition unit includes：Current transformer, amplification treatment circuit and analog to digital conversion circuit, institute
It states current transformer, the amplification treatment circuit and analog-digital conversion circuit as described to be sequentially connected, the real-time electricity for acquiring three-phase
Stream.
Optionally, the amplification treatment circuit includes：Amplifier, low-pass filter and inverting integrator, the amplifier,
The low-pass filter and the inverting integrator are sequentially connected, for being improved accordingly collected signal.Pass through
The conditionings such as amplification, the filtering of the amplification treatment circuit can reduce the signal-to-noise ratio of signal, and anti-stop signal is further attenuated.
Optionally, the voltage zero-cross detection unit includes 3 single-phase zero cross detection circuits, the single-phase zero passage detection electricity
Road is respectively used to detect the voltage over zero of each phase.
Optionally, the phase-change switch further includes arc-control device, for eliminating the mechanical switch when being opened or closed
The electric arc of generation.
Optionally, the timing trigger unit includes timer and trigger, and the timer is connect with the trigger,
The trigger is connect with the current acquisition unit.
Optionally, the buckle releaser uses shunt release or magnetictrip.
A kind of three-phase imbalance commutation device provided by the invention has following advantageous effect：
The present invention may be implemented the realization monitoring of three-phase imbalance and complete commutation Balance Treatment in voltage over zero, reach
The purpose of adjust automatically and saving energy and decreasing loss, while the switch constituted also by thyristor and by mechanical switch and buckle releaser carries out certainly
Move phase, the not power down for reaching single-phase load is switched fast.
Description of the drawings
In order to illustrate more clearly of technical scheme of the present invention, letter will be made to attached drawing needed in the embodiment below
It singly introduces, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as to the present invention
The restriction of protection domain.It for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is the application schematic diagram of the three-phase imbalance commutation device of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the three-phase imbalance commutation device of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the thyristor cell of the three-phase imbalance commutation device of the embodiment of the present invention.
Fig. 4 is the structural schematic diagram of the switch unit of the three-phase imbalance commutation device of the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of the current acquisition unit of the three-phase imbalance commutation device of the embodiment of the present invention；
Fig. 6 is the amplification treatment circuit of the three-phase imbalance commutation device of the embodiment of the present invention；
Fig. 7 (a) to Fig. 7 (c) is the voltage zero-cross detection unit of the three-phase imbalance commutation device of the embodiment of the present invention
Circuit；
Fig. 8 is another structural schematic diagram of the three-phase imbalance commutation device of the embodiment of the present invention.
Main element symbol description：
Three-phase imbalance commutation device -10；Current acquisition unit -100；- 110 amplification treatment circuit of current transformer-
120；Analog to digital conversion circuit -130；Voltage zero-cross detection unit -200；Main control unit -300；Thyristor cell -400；Switch is single
Member -500；Phase-change switch -510；Timing trigger unit -90；Communication unit -600；Protection location -700.
Specific implementation mode
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, the detailed description of the embodiment of the present invention to providing in the accompanying drawings is not intended to limit claimed invention below
Range, but it is merely representative of the selected embodiment of the present invention.Based on the embodiment of the present invention, those skilled in the art are not doing
The every other embodiment obtained under the premise of going out creative work, shall fall within the protection scope of the present invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Herein in the term used in the description of three-phase imbalance commutation device
It is to describe the purpose of specific embodiment, it is not intended that the limitation present invention.Term " and or " used herein includes one
Any and all combinations of a or multiple relevant Listed Items.
Below in conjunction with the accompanying drawings, it elaborates to the specific implementation mode of the present invention.
Referring to Fig.1, the present invention provides a kind of three-phase imbalance commutation device, can be applied to the 380V/ of three-phase four-wire system
220V low-voltage distribution systems, the case where three-phase imbalance can be detected and to pass through thyristor according to default commutation rule single with switch
Member etc. automatically adjusts the line attachment of single-phase load, and overcoming traditional dependence, manually power-off is relocated to carry out three-phase equilibrium tune
Whole problem.
With reference to a kind of three-phase imbalance commutation device 10 that Fig. 2, the present embodiment are proposed, including：Current acquisition unit 100,
Voltage zero-cross detection unit 200, main control unit 300, thyristor cell 400 and switch unit 500.
Current acquisition unit 100 and voltage zero-cross detection unit 200 are all connected with each phase and main control unit 300 of three-phase.
With reference to Fig. 3, thyristor cell 400 includes that driving circuit and 3 thyristors, the input terminal of each thyristor connect respectively
A phase of three-phase is connect, output end is all connected with single-phase load, and control terminal is all connected with the driving circuit, and the driving circuit connects
Main control unit 300.
With reference to Fig. 4, switch unit 500 includes 3 phase-change switches 510, and each phase-change switch 510 includes mechanical switch
And buckle releaser, wherein mechanical switch is connect with each phase and single-phase load, and buckle releaser then connects mechanical switch and main control unit
300。
Specifically, current acquisition unit 100 is used to detect the real-time current of each phase of three-phase.Preferably, with reference to Fig. 5, electricity
Stream collecting unit 100 may include current transformer 110, amplification treatment circuit 120 and analog to digital conversion circuit 130.Current transformer
The signal of acquisition is accessed amplification treatment circuit 120 by 110 after sampling resistor is converted into voltage signal, and passes through enhanced processing
Circuit 120 carries out corresponding signal amplification and is filtered, then is turned the analog signal of acquisition by analog to digital conversion circuit 130
It is changed to digital signal and is sent into main control unit 300.
With reference to Fig. 6, amplification treatment circuit 120 may include signal amplifier, low-pass filter and inverting integrator, use respectively
In carrying out the respective handlings such as signal amplification, filtering and reverse phase integral to collected small signal to obtain more accurately acquiring
As a result.Signal amplifier includes first resistor R1, second resistance R2,3rd resistor R3 and the first difference amplifier U1, through overcurrent
The voltage signal that mutual inductor and sampling resistor obtain passes through the in-phase input end phase of first resistor R1 and the first difference amplifier U1
Even, the inverting input of the first difference amplifier U1 is grounded by second resistance R2, and output end connects by 3rd resistor R3 feedbacks
Its inverting input is connect, the output end of the first difference amplifier U1 is the output end of the signal amplifier.Low-pass filter includes
4th resistance R4 and filter capacitor C1, and inverting integrator includes the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, integral
Capacitance C2 and the second difference amplifier U2.The output end of first difference amplifier U1 is by the 4th resistance R4 and the 5th resistance R5 connections the
The inverting input of two difference amplifier U2, and one end of filter capacitor C1 connects the 4th resistance R4 and the 5th resistance R5, the other end
Ground connection.The in-phase input end of second difference amplifier U2 is by the 6th resistance R6 ground connection, and output end is by the 7th resistance R7 feedbacks
Its in-phase input end is connected, and integrating capacitor C2 is then connected in parallel with the 7th resistance R7, the output end of the second difference amplifier U2 is
For the output end of amplification treatment circuit 120.
The acquisition signal that amplification treatment circuit 120 exports is converted to digital signal and sent by subsequent analog to digital conversion circuit 130
Enter main control unit 300 to obtain the real-time current of corresponding phase line.Wherein, analog to digital conversion circuit 130 is according to A/D conversion methods
Classification can select the A/D converters of distinct methods, such as select counter type, successive approximation, dual integration or parallel type
Any one A/D converter, the requirement of resolution ratio that can also be according to actual needs, precision or conversion time is corresponding to choose
A/D converter.In the present embodiment, the A/D converter in analog to digital conversion circuit 130 uses the conversion chip of successive approximation
Complete analog-to-digital conversion, conversion accuracy and conversion time can generally reach acquisition and require, such as 8 ADC0809.
Main control unit 300 is used to calculate tri-phase unbalance factor simultaneously according to 100 collected real-time current of current acquisition unit
Judge whether obtained tri-phase unbalance factor is more than predetermined threshold value.If obtained tri-phase unbalance factor is more than predetermined threshold value, master control
Unit 300 then exports corresponding commutation in the voltage over zero of corresponding phase line according to preset commutation rule and controls signal to brilliant lock
Pipe unit 400 and switch unit 500 operate to complete corresponding commutation；If being not above the predetermined threshold value, does not export and change
Phase control signal.Wherein, the default commutation rule can self-defining according to actual needs, the commutation rule in the present embodiment is
Single-phase load in the larger phase line of electric current is switched in the smaller phase line of electric current.Wherein, main control unit 300 may include micro- place
Manage device, logical-arithmetic unit and comparator.Logical-arithmetic unit for calculating the related datas such as tri-phase unbalance factor, comparator be used for than
Compared with tri-phase unbalance factor and predetermined threshold value etc., and microprocessor is then according to the correlated results of the logical-arithmetic unit and comparator come defeated
Go out corresponding control command or commutation control signal.Wherein, the step body of logical-arithmetic unit calculating tri-phase unbalance factor may include：
According to collected three-phase current IA、IB、IC, calculate the average current I of three-phaseD；The current differential of three-phase is calculated again, point
It is not | IA-ID|、|IB-ID|、|IC-ID|, and maximum current differential is exported from 3 current differentials, it is denoted as IMAX；Finally
By Δ I=IMAX/ID* 100%, current tri-phase unbalance factor Δ I is calculated.Preferably, the microprocessor is using at ARM
Manage device.ARM processors have the function of powerful control process and with spies such as small, low-power consumption, low cost, high-performance
Point.In addition, arm processor also supports double instruction set of Thumb 16 and ARM 32, it can be compatible with 8/16 devices well
Part and a large amount of register of use, have the characteristics that instruction execution speed is fast and execution efficiency is high.
Wherein, above-mentioned voltage over zero is detected by voltage zero-cross detection unit 200, when voltage zero-cross detection unit
200 when detecting the zero crossing of three-phase voltage, then exports corresponding zero cross signal to microprocessor.Voltage zero-cross detection unit
Zero passage detection method in 200 can be by circuit per mutually one resistance pressure-dividing network of access to by detection resistance
Voltage judge zero crossing, carry out photoelectric coupling after electric resistance partial pressure can also be first passed through to by detecting in photoelectrical coupler
Luminous tube ends to realize the detection etc. to zero.In addition, as shown in Fig. 7 (a) to Fig. 7 (c), the voltage mistake of the present embodiment
Zero detection unit 200 can also detect the zero crossing of each phase voltage using difference amplifier.The single-phase zero passage as shown in Fig. 7 (a)
Point detection circuit is used to detect the voltage over zero of A phases, which includes the 8th resistance R8, the 9th resistance
R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12 and third difference amplifier U3.Detected A phase signals warp
The in-phase input end of the 8th resistance R8 connection third difference amplifiers U3 is crossed, one end of twelfth resistor R12 connects the 8th resistance R8
With the in-phase input end of third difference amplifier U3, other end ground connection.B phases pass through the 9th resistance R9 connection third difference amplifiers U3
Inverting input, eleventh resistor R11 one end connection the 9th resistance R9 and third difference amplifier U3 inverting input,
The other end is grounded.C phases then pass through the 9th resistance R9 and eleventh resistor R11 of the tenth resistance R10 connections, third difference amplifier U3's
Output end exports A phase voltage crossover point signals, wherein B phases and the position of C phases are interchangeable.Similarly, the zero passage detection of B phases and C phases
Circuit is similar with the above-mentioned zero cross detection circuit of A phases, their structures having the same, respectively referring to Fig. 7 (b) and Fig. 7 (c).Its
In, the C phases and the position of A phases in Fig. 7 (b) are interchangeable, and the B phases and the position of A phases in Fig. 7 (c) are also interchangeable.The present embodiment
In voltage zero-cross detection unit 200 pass through to three-phase voltage signal carry out signed magnitude arithmetic(al), it is contemplated that arrive three-phase voltage phase
Mutual relation, and three-phase common-mode signal can be eliminated using differential type detection, further decrease shadow of the interference signal to zero-crossing examination
It rings.
The corresponding commutation control signal that thyristor cell 400 is used to be exported according to main control unit 300 passes through driving circuit
It is turned on and off the thyristor of corresponding phase line, to provide temporary electric current for single-phase load in commutation process so that single-phase
Load not power down in commutation process.Wherein, triode or integrated chip can be used to be turned on and off thyristor in driving circuit.
The corresponding commutation that switch unit 500 is used to be exported according to main control unit 300 controls signal in phase-change switch 510
Buckle releaser apply corresponding electric signal to make buckle releaser driving mechanical switch be closed or be disconnected to complete single-phase load
Phase line switching.Wherein, the buckle releaser can be used shunt release or magnetictrip and control it by main control unit 300 and leads to
Cut-off switch.The mechanical switch includes moving contact and static contact, and each phase of three-phase is real by one group of moving contact and static contact
Now it is turned on or off with single-phase load.Wherein, which can be used such as knife contact or the different knots of dock contact
The contact of structure.
Specifically, it is assumed that main control unit 300 is it has been determined that showing three-phase imbalance situation and needing single-phase load by current
The C phases at place are switched to B phases, then the thyristor of C phases are first connected before the voltage over zero of C phases arrives, then in the electricity of C phases
Zero is pressed through to disconnect the mechanical switch for connecting C phases from C phases.After the mechanical switch of C phases disconnects, then in the voltage of B phases
Zero crossing arrive before by the shutdown of the thyristors of C phases and simultaneously by the turn on thyristors of B phases, then in the voltage over zero of B phases by B
The mechanical switch of phase is closed with B phases, then again turns off the thyristor of B phases, then completes the commutation of single-phase load.In addition, changing
Mutually switch 510 may be equipped with corresponding arc-control device, such as using vacuum arc-extinguishing device or increase corresponding arc-extinguish chamber, be used for
Mechanical switch issuable electric arc in closure or disconnection is eliminated, to further increase the service life of mechanical switch.
Optionally, with reference to Fig. 8, a kind of three-phase imbalance commutation device 10 that the embodiment of the present invention proposes can also wrap
It includes：Timing trigger unit 90, timing trigger unit 90 are connect with current acquisition unit 100 or main control unit 300, defeated for timing
Go out current acquisition signal and is timed acquisition to trigger or control current acquisition unit 100.Specifically, timing trigger unit 90
It may include timer and trigger, according to the default acquisition time of timer, whenever default acquisition time is once to passing through triggering
Device exports an acquisition signal to current acquisition unit 100, or is output to main control unit 300 and notifies electricity by main control unit 300
It flows collecting unit 100 and carries out current acquisition.Wherein, which can be adjusted according to actual needs.Clocked flip
Such as 555 timers and d type flip flop may be used to realize in unit 90, can also realize that timing is touched using monostable flipflop
Send out function.Therefore timing acquiring three-phase current can make collected data more uniform, can also reduce acquisition in real time and place
The power consumption etc. of reason.
Optionally, a kind of three-phase imbalance commutation device 10 that the embodiment of the present invention proposes further includes communication unit
600, communication unit 600 connects main control unit 300, for sending out the relevant informations such as 100 collected electric current of current acquisition unit
It is sent to remote terminal, also receives the commutation control command of remote terminal.Specifically, communication unit 600 can be used as GPRS module,
One kind in a variety of communication modules such as gsm module.Then main control unit 300 can control communication unit 600 send relevant information to
The case where remote terminal understands the commutation device and single-phase load in real time so as to remote terminal.And when remote terminal needs change this
When phase device is controlled accordingly, then communication unit 600 receives corresponding control command and carries out correlation by main control unit 300
Control operation.
Optionally, a kind of three-phase imbalance commutation device 10 of the embodiment of the present invention proposition can also include：Protection is single
Member 700, protection location 700 connect single-phase load and switch unit 500, are used for when short circuit or overcurrent occur for phase line to single-phase negative
Lotus is protected, to improve the safety of device.
Detection and the list of three-phase imbalance may be implemented in a kind of three-phase imbalance commutation device proposed through this embodiment
Phase load does not power off commutation, by using the easily-controllable and oncontacting dot characteristics of thyristor, thyristor is made to be operated in switching moment
Play the role of in the process inhibition shove, overvoltage and arcing；Simultaneously also using the phase-change switch combined with buckle releaser by mechanical switch
To realize fast and reliable closure.Compared with the phase-change switch of some electronic switches, mechanical switch in the present apparatus have it is low at
Originally, the characteristics of low fever, therefore the power consumption that the heating problem brought by electronic switch can be solved and reduce device.In addition, also in electricity
It presses through zero and switches over and greatly to reduce the electric arc that switch generates, correspondingly can further improve the safety and use of device
Service life.
It will be appreciated by those skilled in the art that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, module in attached drawing or
Flow is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in device in implement scene can be described according to implement scene into
Row is distributed in the device of implement scene, can also be carried out respective change and is located at the one or more dresses for being different from this implement scene
In setting.The module of above-mentioned implement scene can be merged into a module, can also be further split into multiple submodule.
Aforementioned present invention serial number is for illustration only, does not represent the quality of implement scene.Disclosed above is only the present invention
Several specific implementation scenes, still, the present invention is not limited to this, and the changes that any person skilled in the art can think of is all
Protection scope of the present invention should be fallen into.
Claims (10)
1. a kind of three-phase imbalance commutation device, which is characterized in that including：Current acquisition unit, main control unit, voltage zero-cross inspection
Survey unit, thyristor cell and switch unit；
The current acquisition unit is used to acquire the electric current of three-phase；
The voltage zero-cross detection unit is used to detect the voltage over zero of each phase；
The main control unit is used for according to the Current calculation tri-phase unbalance factor, if the tri-phase unbalance factor is more than default threshold
Value then exports corresponding commutation in the voltage over zero of corresponding phase line according to default commutation rule and controls signal；If the three-phase
Degree of unbalancedness is not above the predetermined threshold value, then does not export the commutation control signal；
The thyristor cell includes driving circuit and thyristor, and the thyristor is used to connect each mutually and single-phase negative of three-phase
Lotus, the driving circuit are used to control shutdown or the opening that signal drives the thyristor according to the commutation；
The switch unit includes mechanical switch and buckle releaser, and the mechanical switch is used to connect each mutually and described of the three-phase
Single-phase load, the buckle releaser are used to drive the closure of the mechanical switch according to commutation control signal or disconnect to cut
Change the access phase line of the single-phase load.
2. three-phase imbalance commutation device according to claim 1, which is characterized in that further include：Timing trigger unit, institute
Timing trigger unit is stated to connect with the current acquisition unit or the main control unit, for timing output current acquisition signal with
It triggers the current acquisition unit and is timed acquisition.
3. three-phase imbalance commutation device according to claim 1, which is characterized in that further include：Communication unit is described logical
It interrogates unit and connects the main control unit, for the information of the electric current to be sent to remote terminal, also receive the control of remote terminal
System order.
4. three-phase imbalance commutation device according to claim 1, which is characterized in that further include：Protection location, the guarantor
Shield unit is connect with the switch unit and the single-phase load, is used for when short circuit or overcurrent occur for circuit to described single-phase negative
Lotus is protected.
5. three-phase imbalance commutation device according to claim 1, which is characterized in that the current acquisition unit includes：
Current transformer, amplification treatment circuit and analog to digital conversion circuit, the current transformer, the amplification treatment circuit and the mould
Number conversion circuit is sequentially connected, the real-time current for acquiring three-phase.
6. three-phase imbalance commutation device according to claim 5, which is characterized in that the amplification treatment circuit includes：
Amplifier, low-pass filter and inverting integrator, the amplifier, the low-pass filter and the inverting integrator connect successively
It connects, for being improved accordingly collected signal.
7. three-phase imbalance commutation device according to claim 1, which is characterized in that the voltage zero-cross detection unit packet
3 single-phase zero cross detection circuits are included, the single-phase zero cross detection circuit is respectively used to detect the voltage over zero of each phase.
8. three-phase imbalance commutation device according to claim 1, which is characterized in that the switch unit further includes arc extinguishing
Device, the electric arc generated for eliminating the mechanical switch when being opened or closed.
9. three-phase imbalance commutation device according to claim 2, which is characterized in that the timing trigger unit includes fixed
When device and trigger, the timer connect with the trigger, the trigger is connect with the current acquisition unit.
10. three-phase imbalance commutation device according to claim 1, which is characterized in that the buckle releaser is de- using shunt opening
Detain device or magnetictrip.
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