CN108599205A - A kind of phase-change switch main circuit and control method - Google Patents
A kind of phase-change switch main circuit and control method Download PDFInfo
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- CN108599205A CN108599205A CN201810689733.9A CN201810689733A CN108599205A CN 108599205 A CN108599205 A CN 108599205A CN 201810689733 A CN201810689733 A CN 201810689733A CN 108599205 A CN108599205 A CN 108599205A
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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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- 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
Abstract
The control method of a kind of phase-change switch main circuit of the present invention and the corresponding phase-change switch.Wherein main circuit goes out switch, main relay including three into one, A, B, C phase line of three phase mains are respectively connected to three into one input terminals for going out switch, three into one go out the normally closed switch of the output end concatenation main relay of switch, A, B, C phase line of three phase mains also draw three independences and mutually isostructural A phases commutation auxiliary branch, B phase commutations auxiliary branch, C phase commutation auxiliary branch respectively, the output end of A phase commutation auxiliary branch, the output end of B phase commutation auxiliary branch, C phase commutation auxiliary branch output end and be connected to the output end of main relay.Go out to switch into one by using three with mechanical chain, in any commutation process, all there was only the output supply load of a wherein phase, it is each alternate all with apparent fracture, prevent the power failure of phase fault.
Description
Technical field
The present invention relates to a kind of phase-change switch main circuits, and the invention further relates to the control methods of the corresponding phase-change switch.
Background technology
In electric power supply system, the power supply of generally use three-phase power transformer, and the load of general residential houses is flat
It is distributed in the electricity consumption side of three-phase.Ideally, the electricity consumption side threephase load of power transformer is balanced, neutral line current zero,
The energy loss of transformer and supply line is small.However, the power utilization environment in reality is complicated, it is difficult to realize three-phase equilibrium, at this point,
It needs the load by heavy load phase to switch to light load phase, reaches the state close to three-phase equilibrium.
Commonly commutation circuit has following several, is as shown in Figure 1 synchronous switch commutation circuit, when A phase loads are heavier,
The voltage over zero of A phases is detected, A phase main switches are disconnected；And in the voltage over zero of B phases, it is closed B phase main switches, this commutation
The defect of switch is：There are power failure in commutation process, it is easy to bring impact to power consumer.
It is illustrated in figure 2 combination switch commutation circuit, three thyristors respectively and are connected to the main switch of A, B, C three-phase
On, when needing commutation, first connection and currently phase and the thyristor connect disconnect the main switch of current phase；It connects again and target phase
And the thyristor connect, connect the main switch of target phase；Finally, disconnect with current phase and the thyristor connect and with target phase and connect
Thyristor.Although the seamless switching of current phase and target phase may be implemented in this phase-change switch, still, due to the thyristor moment
The voltage in circuit is subject, the breakdown of thyristor is easy to cause, forms phase fault.Chinese patent literature number is
CN207283168U《It is a kind of for the intermittent electric load commutation circuit of electrical zero》In, by the normally opened of diode and magnetic latching relay
It switchs concatenated three-phase auxiliary commutation branch and is connected on Three-phase magnetic latching relay main switch, in the wink of current phase and target phase
When amplitude unfavourable balance occurs before, the main switch of the current phase of disjunction and the auxiliary commutation branch for connecting target phase, it is current mutually and
At the time of unfavourable balance occurs for the instantaneous amplitude of target phase, seamless electronics switching is realized, finally in the instantaneous width of current phase and target phase
After unfavourable balance occurs for value, the main switch of target phase, the auxiliary commutation branch in the current phase of disjunction and target phase are connected.Likewise,
This circuit is due to lacking mechanical interlocking, once control mistake or magnetic latching relay unusual condition occurs, phase fault is not yet
It can avoid.
Invention content
It is an object of the invention to overcome the deficiencies of existing technologies, whenever all only providing one kind having mechanical interlocking,
The main switch of wherein one phase line is can turn on, it is simple in structure, and can realize that the current commutation mutually with the switching of target phase equilibrium is opened
Main circuit is closed, the present invention also provides a kind of control methods corresponding to the above phase-change switch main circuit.
To achieve the above object, the present invention uses such a phase-change switch main circuit, main circuit to go out out including three into one
It closes, main relay, A, B, C phase line of three phase mains are respectively connected to three into one input terminals for going out switch, and described three into one go out out
The normally closed switch of the output end concatenation main relay of pass, A, B, C phase line of the three phase mains also draw three independences respectively
And mutually isostructural A phases commutation auxiliary branch, B phase commutations auxiliary branch, C phase commutation auxiliary branch, A phase commutations auxiliary
The output end of branch, the output end of the B phase commutation auxiliary branch, the C phase commutation auxiliary branch output end and connect
To the output end of the main relay.Compared with the prior art, beneficial effects of the present invention are embodied in：By using with machine
Tool it is chain three into one go out switch, in any commutation process, all there was only the output supply load of a wherein phase, and alternate all have
Apparent fracture has prevented the power failure of phase fault, realizes the function of alternate anti-short circuit；In addition, passing through reasonable arrangement
The control sequential that three-phase auxiliary commutation branch, three into one go out switch and main relay, realizes steady commutation, without electric arc when commutation
It generates, ensure that the reliability of phase-change switch circuit, the longer life expectancy of product.
Particularly, described three into one to go out switch include that there is the 4th magnetic latching relay of mechanical chain and the 5th magnetic to protect
Hold relay, the normally closed interlock of the 4th magnetic latching relay is connected to A phases and inputs phase line, the 4th magnetic keep after
The normally open contact of electric appliance is connected to B phases and inputs phase line, the contact of the 4th magnetic latching relay is public be connected to it is described
The normally open contact at the normally closed interlock end of the 5th magnetic latching relay, the 5th magnetic latching relay is connected to C phase the input phases
Line, the public input terminal for being connected to the main relay of the contact of the 5th magnetic latching relay.Pass through control the 4th
The change-over switch of the change-over switch of magnetic latching relay and the 5th magnetic latching relay so that in A, B, C phase of three phase mains only
Have and is exported all the way through main relay, it is simple in structure, form effective fracture isolation alternate.
Particularly, the A phase commutation auxiliary branch includes the first diode and the first magnetic latching relay of concatenation
Normal open switch, the B phase commutation auxiliary branch include that the second diode of concatenation and the normally opened of the second magnetic latching relay open
It closes, the C phase commutation auxiliary branch includes the normal open switch of the third diode and third magnetic latching relay of concatenation.It utilizes
The unilateal conduction characteristic of diode is switched on or switched off the normal open switch of auxiliary commutation branch when this is mutually blocked by diode, connects
On-off open procedure is generated without electric arc and current loss, more securely and reliably；In addition, by being used in commutation auxiliary branch
Normal open switch so that each commutation auxiliary branch is isolated with effective fracture.
To achieve the above object, the present invention also uses the phase change control method of such a phase-change switch, with current phase
When the step of any one is commutation starting point by the negative zero crossing of forward direction, current target phase commutation in opposite directions is according to three phase mains waveform
Sequence linking carries out,
The first step connects the commutation auxiliary branch of current phase in first waveform negative half period of current phase；
Second step, the main relay in the waveform positive half cycle of the current phase after completing the above first step described in disjunction；
Third walks, and the commutation auxiliary branch of target phase is connected in first waveform negative half period of target phase；
4th step, will complete first after above third step it is current mutually with the intersection point of target phase as the commutation moment,
The commutation moment, to described three into one, which go out to switch the main circuit for sending out the current opposite target phase of control instruction completion, cuts
It changes；
5th step in first waveform negative half period of the current phase more than completing after the 4th step, disconnects changing for current phase
Phase auxiliary branch, and the main relay is completed in first waveform positive half cycle of the target phase more than completing after the 4th step
Closure；
6th step, the commutation of disconnection target phase in first waveform negative half period of the target phase after completing above 5th step
Auxiliary branch.
Particularly, the phase change control method includes sequence phase change control method, the sequence phase change control method
It is as follows,
According to three phase mains waveform sequential, detection sequence it is current mutually any one by the negative zero crossing of forward direction as the t0 moment,
What the voltage negative half cycle waveform of the current phase of sequence and the voltage negative half cycle waveform of non-sequential target phase adjacent thereto intersected for the first time
Moment, sequence is current to be mutually used as the t2 moment by the positive zero crossing of negative sense for the first time as the t1 moment, non-sequential target mutually first time by
The positive zero crossing of negative sense is as t3 moment, the electricity of the voltage positive half cycle waveform and non-sequential target phase adjacent thereto of the current phase of sequence
As the t4 moment at the time of positive pressure half cycle waveform intersects for the first time, sequentially currently second of phase is by the negative zero crossing conduct of forward direction
At the t5 moment, second of zero crossing born by forward direction of non-sequential target phase is as t6 moment, the voltage negative half cycles of the current phase of sequence
As t7 moment, non-sequential target phase at the time of second of the intersection of the voltage negative half cycle waveform of shape and non-sequential target phase adjacent thereto
Second by the positive zero crossing of negative sense as the t8 moment, using t0 to t8 as primary completely sequence commutation process, according to
Lower step carries out：
The first step, in t0 to t1 moment, the magnetic sent out in the commutation auxiliary branch of the current phase of control instruction connection sequence is protected
Hold the normal open switch of relay；
Second step sends out control instruction and disconnects the main relay in t2 to t3 moment；
Third walks, and in t1 to t3 moment, the magnetic sent out in the commutation auxiliary branch of control instruction connection non-sequential target phase is protected
Hold the normal open switch of relay；
4th step, in t3 to t5 moment, to three into one, which go out switch, sends out the current opposite sequence mesh of control instruction completion sequence
Mark the main circuit switching of phase；
5th step, in t5 to t7 moment, the magnetic sent out in the commutation auxiliary branch of the current phase of control instruction disconnection sequence is protected
Hold the normal open switch of relay；5th step further include in t5 to t6 moment, send out control instruction connect the master after
Electric appliance；
6th step, in t7 to t8 moment, the magnetic sent out in the commutation auxiliary branch of control instruction disconnection non-sequential target phase is protected
Hold the normal open switch of relay.
Particularly, the phase change control method includes backward phase change control method, the backward phase change control method
It is as follows, according to three phase mains waveform sequential, detection backward it is current mutually any one by just becoming negative zero crossing as t0 moment, backward
Current mutually first time, the first time of backward target phase was by just becoming negative zero crossing conduct by the positive zero crossing of negative change as the t1 moment
At the t2 moment, backward is current to be mutually used as the t3 moment second by just becoming negative zero crossing, backward target mutually second it is positive by negative change
For zero crossing as the t4 moment, backward is current mutually for the second time by the positive zero crossing of negative change as t5 moment, mutually second of backward target
By just becoming negative zero crossing as the t6 moment, mutually third time becomes positive zero crossing as the t7 moment to backward target by negative.It is arrived with t0
T7 is followed the steps below as primary complete backward commutation process：
The first step, at t0 to the t1 moment, send out control instruction connect backward currently mutually the magnetic of auxiliary commutation branch keep after
The normal open switch of electric appliance；
Second step sends out control instruction and disconnects main relay at t1 to the t3 moment；
Third walks, at t2 to the t4 moment, send out control instruction connect backward target mutually assist the magnetic holding of commutation branch after
The normal open switch of electric appliance；
4th step, at t3 to the t4 moment, sending out control instruction makes three into one to go out switch completion from the current phase of backward to backward
The main circuit of target phase switches；
5th step, at t3 to the t5 moment, send out control instruction disconnect backward currently mutually the magnetic of auxiliary commutation branch keep after
The normal open switch of electric appliance；5th step further includes sending out control instruction at t4 to the t6 moment and connecting main relay；
6th step, at t6 to the t7 moment, send out control instruction disconnect backward target mutually assist the magnetic of commutation branch keep after
The normal open switch of electric appliance.
Compared with the prior art, beneficial effects of the present invention are embodied in：First in the voltage negative half period of current phase, target phase
It is upper to connect current phase, the auxiliary commutation branch in target phase；It is then detected that go out the auxiliary commutation branch of current phase when being powered,
Main relay is disconnected, at this point, three into one current paths for going out switch have disconnected, and then three into one is controlled and goes out switch completion main circuit
Switching；Finally, current phase, target phase another voltage negative half period on disconnect the auxiliary commutation of current phase, target phase successively
Branch detects that the auxiliary commutation branch of target phase when being powered, recloses main relay.Since current phase, target are mutually auxiliary
Commutation branch on or off under the conditions of no current is helped, circuit is without arc loss, securely and reliably；In addition, before commutation, currently
When the auxiliary commutation branch of phase is powered, main relay is just turned off, after commutation, when the auxiliary commutation branch of target phase is powered,
Connect main relay so that power supply is connected in the period of disconnection, by the auxiliary commutation branch of current phase or target phase in main relay
Circuit, load supplying are able to continuously, and especially sequence phase change control method can realize seamless switching, and in entire commutation process,
The only loss of the diode tube pressuring drop of moment, is more energy-saving and environmentally friendly；Finally, due to main relay reliable turn-off, three into
The one commutation operation for going out switch is carried out under the conditions of currentless, and the safe and reliable of commutation process, product are further ensured
Service life can greatly extend.
Description of the drawings
Fig. 1 is a kind of main circuit diagram of phase-change switch in the prior art；
Fig. 2 is the main circuit diagram of another phase-change switch in the prior art；
Fig. 3 is the main circuit diagram of phase-change switch of the present invention；
Fig. 4 is the switch contact location drawing of the present invention after A-B sequence commutations；
Fig. 5 is the sequence phase change control method sequence diagram of phase-change switch of the present invention；
Fig. 6 is the switch contact location drawing of the present invention after A-C backward commutations；
Fig. 7 is the backward phase change control method sequence diagram of phase-change switch of the present invention；
Specific implementation mode
As shown in figure 3, a kind of phase-change switch main circuit, main circuit goes out switch, main relay, three phase mains including three into one
A, B, C phase line be respectively connected to three into one input terminals for going out switch, three into one go out the output ends concatenation main relay K21's of switch
A, B, C phase line of normally closed switch, three phase mains also draw three independences and mutually isostructural A phases commutation auxiliary branch, B phases respectively
Commutation auxiliary branch, C phase commutation auxiliary branch, the output end of A phase commutation auxiliary branch, the output end of B phase commutation auxiliary branch,
The output end of C phase commutation auxiliary branch and the output end for being connected to main relay K21.
Three into one go out switch include the 4th magnetic latching relay K11 and the 5th magnetic latching relay with mechanical chain
The normally closed interlock of K12, the 4th magnetic latching relay K11 are connected to A phases and input phase line, and the 4th magnetic latching relay K11's is normally opened
Contact is connected to B phases and inputs phase line, and the contact of the 4th magnetic latching relay K11 is public to be connected to the 5th magnetic latching relay K12
Normally closed interlock end, the normally open contact of the 5th magnetic latching relay K12 is connected to C phases and inputs phase line, the 5th magnetic latching relay
The public input terminal for being connected to main relay K21 of the contact of K12.
A phase commutation auxiliary branch includes the normal open switch of the first diode Da and the first magnetic latching relay Ja of concatenation, B
Phase commutation auxiliary branch includes the normal open switch of the second diode Db and the second magnetic latching relay Jb of concatenation, and C phase commutations are auxiliary
It includes the normal open switch of the third diode Dc and third magnetic latching relay Jc of concatenation to help branch.
A kind of phase change control method of phase-change switch is originated by the negative zero crossing of forward direction as commutation using either one or two of current phase
The step of point, current opposite target phase commutation is connected according to three phase mains waveform sequential to carry out,
The first step connects the commutation auxiliary branch of current phase in first waveform negative half period of current phase；
Second step, the disjunction main relay in the waveform positive half cycle of the current phase after completing the above first step；
Third walks, and the commutation auxiliary branch of target phase is connected in first waveform negative half period of target phase；
4th step, will complete first after above third step it is current mutually with the intersection point of target phase as the commutation moment,
At the commutation moment, to three into one, which go out switch, sends out the main circuit switching that control instruction completes current opposite target phase；
5th step in first waveform negative half period of the current phase more than completing after the 4th step, disconnects changing for current phase
Phase auxiliary branch, and closing for main relay is completed in first waveform positive half cycle of the target phase more than completing after the 4th step
It closes；
6th step, the commutation of disconnection target phase in first waveform negative half period of the target phase after completing above 5th step
Auxiliary branch.
As shown in Figure 4,5, phase change control method includes sequence phase change control method, here with A-B sequence commutation controlling parties
Method is exemplified below,
According to three phase mains waveform sequential, the current phase A of detection sequence any one by the negative zero crossing of forward direction as the t0 moment,
The voltage negative half cycle waveform of the current phase A of sequence and the voltage negative half cycle waveform of non-sequential target phase B adjacent thereto intersect for the first time
At the time of as the t1 moment, the current phase A of sequence is for the first time by the positive zero crossing of negative sense as t2 moment, non-sequential target phase B first
The secondary zero crossing positive by negative sense is as t3 moment, the voltage positive half cycle waveform and non-sequential target adjacent thereto of the current phase A of sequence
As the t4 moment at the time of voltage positive half cycle waveform of phase B intersects for the first time, sequentially currently second of phase A is by the negative mistake of forward direction
Zero is as the t5 moment, and second of zero crossing born by forward direction of non-sequential target phase B is as t6 moment, the electricity of the current phase A of sequence
When at the time of pressing second of the intersection of the voltage negative half cycle waveform of negative half period waveform and non-sequential target phase B adjacent thereto as t7
Carve, non-sequential target phase B second by the positive zero crossing of negative sense as the t8 moment, using t0 to t8 as once completely sequentially changing
Phase process, follows the steps below：
The first step, in t0 to t1 moment, the magnetic sent out in the commutation auxiliary branch of the current phase A of control instruction connection sequence is protected
Hold the normal open switch of relay Ja；
Second step sends out control instruction and disconnects main relay K21 in t2 to t3 moment；
Third walks, and in t1 to t3 moment, the magnetic sent out in the commutation auxiliary branch of control instruction connection non-sequential target phase B is protected
Hold the normal open switch of relay Jb；
4th step, in t3 to t5 moment, to three into one, which go out switch, sends out the current phase A of control instruction completion sequence to sequence mesh
Mark the main circuit switching of phase B；Here, control command is sent out to the 4th magnetic latching relay K11, enables the 4th magnetic latching relay
The normal open switch of the normally closed switch disjunction of K11, the 4th magnetic latching relay K11 is closed.
5th step, in t5 to t7 moment, the magnetic sent out in the commutation auxiliary branch of the current phase A of control instruction disconnection sequence is protected
Hold the normal open switch of relay Ja；5th step further includes sending out control instruction in t5 to t6 moment and connecting main relay K21；
6th step, in t7 to t8 moment, the magnetic sent out in the commutation auxiliary branch of control instruction disconnection non-sequential target phase B is protected
Hold the normal open switch of relay Jb.
As shown in Figure 6,7, phase change control method includes backward phase change control method, here with A-C sequence commutation controlling parties
Method is exemplified below,
According to three phase mains waveform sequential, the current phase A of detection backward any one by just becoming negative zero crossing as the t0 moment,
The current phase A of backward is for the first time by the positive zero crossing of negative change as the t1 moment, and the first time of backward target phase C is by just becoming negative zero passage
Point is used as the t2 moment, and the current phase A of backward second is used as the t3 moment by just becoming negative zero crossing, backward target phase C for the second time by
The positive zero crossing of negative change is as the t4 moment, and the current phase A of backward is for the second time by the positive zero crossing of negative change as t5 moment, backward target
Phase C second is used as the t6 moment by just becoming negative zero crossing, backward target phase C third times by the positive zero crossing of negative change as t7 when
It carves.Using t0 to t7 as primary complete backward commutation process, follow the steps below：
The first step, at t0 to the t1 moment, send out control instruction connect the current phase A auxiliary commutation branch of backward magnetic keep after
The normal open switch of electric appliance Ja；
Second step sends out control instruction and disconnects main relay K21 at t1 to the t3 moment；
Third walks, at t2 to the t4 moment, send out control instruction connect the magnetic holdings of backward target phase C auxiliary commutation branches after
The normal open switch of electric appliance Jc；
4th step, at t3 to the t4 moment, sending out control instruction makes three into one to go out switch completion from the current phase A of backward to backward
The main circuit of target phase C switches；Here, control command is sent out to the 5th magnetic latching relay K12, enables the 5th magnetic latching relay
The normal open switch of the normally closed switch disjunction of K12, the 5th magnetic latching relay K12 is closed.
5th step, at t3 to the t5 moment, send out control instruction disconnect the current phase A auxiliary commutation branch of backward magnetic keep after
The normal open switch of electric appliance Ja；5th step further includes sending out control instruction at t4 to the t6 moment and connecting main relay K21；
6th step, at t6 to the t7 moment, send out control instruction disconnect backward target phase C auxiliary commutation branches magnetic keep after
The normal open switch of electric appliance Jc.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention, all spirit in the present invention
With within principle made by all any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of phase-change switch main circuit, it is characterised in that：Main circuit goes out switch, main relay, three phase mains including three into one
A, B, C phase line be respectively connected to three into one input terminals for going out switch, described three into one output ends for going out switch concatenate main relay
A, B, C phase line of the normally closed switch of device, the three phase mains also draw three independences respectively and mutually isostructural A phases commutation is auxiliary
Help branch, B phase commutations auxiliary branch, C phase commutation auxiliary branch, output end, the B of the A phase commutation auxiliary branch
The output end of phase commutation auxiliary branch, the C phase commutation auxiliary branch output end and be connected to the defeated of the main relay
Outlet.
2. phase-change switch main circuit according to claim 1, it is characterised in that：It includes having that described three go out switch into one
4th magnetic latching relay of mechanical chain and the 5th magnetic latching relay, the normally closed interlock of the 4th magnetic latching relay
It being connected to A phases and inputs phase line, the normally open contact of the 4th magnetic latching relay is connected to B phases and inputs phase line, and described
The public normally closed interlock end for being connected to the 5th magnetic latching relay of the contact of four magnetic latching relays, the 5th magnetic
The normally open contact of guard relay is connected to C phases and inputs phase line, and the contact of the 5th magnetic latching relay is public to be connected to
The input terminal of the main relay.
3. phase-change switch main circuit according to claim 1 or 2, it is characterised in that：The A phase commutation auxiliary branch packets
The normal open switch of the first diode and the first magnetic latching relay of concatenation is included, the B phase commutation auxiliary branch includes concatenation
The second diode and the second magnetic latching relay normal open switch, the C phase commutation auxiliary branch include concatenation third
The normal open switch of diode and third magnetic latching relay.
4. a kind of phase change control method of phase-change switch, it is characterised in that：With either one or two of current phase by the negative zero crossing of forward direction
For commutation starting point, currently the step of opposite target phase commutation is connected according to three phase mains waveform sequential and carries out,
The first step connects the commutation auxiliary branch of current phase in first waveform negative half period of current phase；
Second step, the main relay in the waveform positive half cycle of the current phase after completing the above first step described in disjunction；
Third walks, and the commutation auxiliary branch of target phase is connected in first waveform negative half period of target phase；
4th step will complete first after the above third walks current phase with the intersection point of target phase as the commutation moment, described
The commutation moment, to described three into one, which go out switch, sends out the main circuit switching that control instruction completes current opposite target phase；
5th step, in first waveform negative half period of the current phase more than completing after the 4th step, the commutation for disconnecting current phase is auxiliary
Branch is helped, and completes closing for the main relay in first waveform positive half cycle of the target phase more than completing after the 4th step
It closes；
6th step, the commutation that target phase is disconnected in first waveform negative half period of the target phase after completing above 5th step assist
Branch.
5. the phase change control method of phase-change switch according to claim 4, it is characterised in that：The phase change control method
Including sequence phase change control method, the sequence phase change control method is as follows,
According to three phase mains waveform sequential, current mutually any one zero crossing born by forward direction of detection sequence is as t0 moment, sequence
At the time of the voltage negative half cycle waveform of current phase and the voltage negative half cycle waveform of non-sequential target phase adjacent thereto intersect for the first time
As the t1 moment, sequence is current mutually for the first time by the positive zero crossing of negative sense as the t2 moment, and non-sequential target is mutually for the first time by negative sense
Positive zero crossing is as the t3 moment, and the voltage positive half cycle waveform of the current phase of sequence and the voltage of non-sequential target phase adjacent thereto are just
As the t4 moment at the time of intersection for the first time of half cycle waveform, when second of zero crossing born by forward direction of the current phase of sequence is as t5
Carve, the second of non-sequential target phase is used as the t6 moment by the negative zero crossing of forward direction, the voltage negative half cycle waveform of the current phase of sequence with
As the t7 moment at the time of voltage negative half cycle waveform of non-sequential target phase adjacent thereto second intersects, the of non-sequential target phase
The secondary zero crossing positive by negative sense is as the t8 moment, using t0 to t8 as primary complete sequence commutation process, according to following step
It is rapid to carry out：
The first step, in t0 to t1 moment, send out the magnetic in the commutation auxiliary branch of the current phase of control instruction connection sequence keep after
The normal open switch of electric appliance；
Second step sends out control instruction and disconnects main relay in t2 to t3 moment；
Third walks, in t1 to t3 moment, send out the magnetic that control instruction is connected in the commutation auxiliary branch of non-sequential target phase keep after
The normal open switch of electric appliance；
4th step, in t3 to t5 moment, to three into one, which go out switch, sends out the current opposite non-sequential target phase of control instruction completion sequence
Main circuit switching；
5th step, in t5 to t7 moment, send out the magnetic in the commutation auxiliary branch of the current phase of control instruction disconnection sequence keep after
The normal open switch of electric appliance；5th step further includes sending out control instruction in t5 to t6 moment and connecting the main relay；
6th step, in t7 to t8 moment, send out the magnetic that control instruction disconnects in the commutation auxiliary branch of non-sequential target phase keep after
The normal open switch of electric appliance.
6. the phase change control method of phase-change switch according to claim 4, it is characterised in that：The phase change control method
Including backward phase change control method, the backward phase change control method is as follows,
According to three phase mains waveform sequential, detection backward it is current mutually any one by just becoming negative zero crossing as t0 moment, backward
Current mutually first time, the first time of backward target phase was by just becoming negative zero crossing conduct by the positive zero crossing of negative change as the t1 moment
At the t2 moment, backward is current to be mutually used as the t3 moment second by just becoming negative zero crossing, backward target mutually second it is positive by negative change
For zero crossing as the t4 moment, backward is current mutually for the second time by the positive zero crossing of negative change as t5 moment, mutually second of backward target
By just becoming negative zero crossing as the t6 moment, mutually third time becomes positive zero crossing as the t7 moment to backward target by negative.It is arrived with t0
T7 is followed the steps below as primary complete backward commutation process：
The first step sends out control instruction and connects the magnetic latching relay that backward currently mutually assists commutation branch at t0 to the t1 moment
Normal open switch；
Second step sends out control instruction and disconnects main relay at t1 to the t3 moment；
Third walks, and at t2 to the t4 moment, sends out control instruction and connects the magnetic latching relay that backward target mutually assists commutation branch
Normal open switch；
4th step, at t3 to the t4 moment, sending out control instruction makes three into one to go out switch completion from the current phase of backward to backward target
The main circuit of phase switches；
5th step sends out control instruction and disconnects the magnetic latching relay that backward currently mutually assists commutation branch at t3 to the t5 moment
Normal open switch；5th step further includes sending out control instruction at t4 to the t6 moment and connecting main relay；
6th step sends out control instruction and disconnects the magnetic latching relay that backward target mutually assists commutation branch at t6 to the t7 moment
Normal open switch.
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