CN108448600A - Commutation system suitable for three phase network - Google Patents
Commutation system suitable for three phase network Download PDFInfo
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- CN108448600A CN108448600A CN201810292111.2A CN201810292111A CN108448600A CN 108448600 A CN108448600 A CN 108448600A CN 201810292111 A CN201810292111 A CN 201810292111A CN 108448600 A CN108448600 A CN 108448600A
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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 discloses a kind of commutation systems suitable for three phase network to include：First switch device is connected to the load of three phase network for one in three phase network to be connected；Second switch device, for the connection between on or off first switch device and the load of three phase network；Controller, for controlling first switch device or/and second switch device so that the only switching when second switch device disconnects the connection between load of the first switch device with three phase network of first switch device is connected to another phase of three phase network.The invention has the beneficial effects that：Provide a kind of commutation system suitable for three phase network that can effectively prevent phase fault.
Description
Technical field
The present invention relates to a kind of grid equipments, and in particular to a kind of commutation system suitable for three phase network.
Background technology
The call administered is increased to three-phase imbalance for response national grid, phase-change switch product is that occur recent years
Three phase imbalance regulating device.The product for administering three-phase imbalance on the market at present is roughly divided into three classes：Phase-change switch, electricity
Power electronic active controlling device (such as SVG) and alternate flying capcitor device.Wherein, the advantage of phase-change switch is to take stopgap measures to effect a permanent cure ---
The change three-phase current of essence, and both other is to change transformer side three-phase current.And SVG cost price is higher,
Power consumption is larger；Alternate flying capcitor is higher to environmental requirement：Must lack idle environment, the pair that no merits and demerits otherwise can be brought to mend
Effect.The above problem is not present in phase-change switch, and with preferably three-phase imbalance regulating effect, the current big rule in the whole nation
Mould promotes and applies.
Current electronics phase-change switch does not have interlocking function, and in the case that it is certain it is uncertain will appear it is alternate
Short circuit greatly affected the service life and safety in utilization of phase-change switch.
Invention content
A kind of commutation system suitable for three phase network includes：
First switch device is connected to the load of three phase network for one in three phase network to be connected；
Second switch device, for the connection between on or off first switch device and the load of three phase network；
Controller, for controlling first switch device or/and second switch device so that first switch device is only second
Switching is connected to the another of three phase network when switching device disconnects the connection between first switch device and the load of three phase network
Phase.
Further, first switch device includes：
First phase switchs, the connection for the first phase and second switch device on or off three phase network；
Two-phase switch, the connection switched with the first phase for the second phase on or off three phase network；
Third phase switchs, the connection for third phase and second switch device on or off three phase network；
Wherein, controller is switched with the first phase, and two-phase switch and third phase switch constitute signal transmission so that the first phase
Switch, two-phase switch and third phase switch act under the signal control of controller.
Further, the first phase switch includes：First phase contact, the first stationary contact and the first movable contact；Two-phase switch
Including：Second phase contact, the second stationary contact and the second movable contact；Third phase switchs：Third phase contact, third stationary contact and
Third movable contact；
Wherein, the first phase contact is connected to the first phase of three phase network；Second phase contact is connected to the second of three phase network
Phase；Third phase contact portion to three phase network third phase；First stationary contact is connected to the second movable contact, the connection of the second stationary contact
To third movable contact；Third stationary contact is hanging；First movable contact is connected to second switch device and is only capable of being switchably coupled to
One in both first phase contact and the first stationary contact；Second movable contact is only capable of being switchably coupled to the second phase contact and
One in two stationary contact the two；Third movable contact is only capable of being switchably coupled in both third phase contact and the first stationary contact
One.
Further, the first phase switch includes the first calutron, and calutron is for passing through the magnetic field by electric energy production
It controls the first movable contact and is connected to third phase contact or the first stationary contact.
Further, two-phase switch includes the second calutron, and calutron is for passing through the magnetic field by electric energy production
It controls the second movable contact and is connected to third phase contact or the second stationary contact.
Further, third phase switch includes third calutron, and calutron is for passing through the magnetic field by electric energy production
Control third movable contact is connected to third phase contact or third stationary contact.
Further, first switch device includes：
Single-phase switching switch, the connection for a phase and second switch device on or off three phase network；
Two-phase switching switch, the connection for remaining two-phase and single-phase switching switch on or off three phase network；
Wherein, controller is switched with single-phase switching and two-phase switching switch constitutes signal transmission so that the first phase switchs, and the
Two-phase switch and third phase switch act under the signal control of controller.
Further, single-phase switching switch includes：Single-phase phase contact, single-phase stationary contact and single-phase movable contact；Two-phase switches
Switch includes：The first contact of two-phase, the second contact of two-phase and two-phase movable contact；Wherein single-phase phase contact is connected in three phase network
A phase, single-phase stationary contact is connected to two-phase movable contact, and single-phase movable contact is connected to second switch device and is only capable of can be switched
Ground is connected to one in single-phase phase contact and single-phase stationary contact；The first contact of two-phase and the second contact of two-phase are respectively connected to three
Remaining two-phase in phase power grid, two-phase movable contact are only capable of being switchably coupled in the second contact of the first contact of two-phase and two-phase
One.
Further, single-phase switching switch includes single-phase electromagnetic device, and single-phase electromagnetic device is used for by by electric energy production
Magnetic field control single-phase movable contact and be connected to single-phase phase contact or single-phase stationary contact.
Further, two-phase switching switch includes：Two-phase calutron, two-phase calutron are used for by by electric energy production
Magnetic field control two-phase movable contact be connected to the second contact of the first contact of two-phase or two-phase.
The invention has the beneficial effects that：
Provide a kind of commutation system suitable for three phase network that can effectively prevent phase fault.
Description of the drawings
Fig. 1 is the structural schematic block diagram of a preferred embodiment of the present invention；
Fig. 2 is the structural schematic block diagram of another preferred embodiment of the present invention；
Fig. 3 is the structural schematic block diagram of a segmentation scheme of the invention；
Fig. 4 is the structural schematic diagram of another segmentation scheme of the invention；
Fig. 5 is part-structure entity structure schematic diagram in Fig. 4；
Fig. 6 is the structural schematic diagram of partial circuit in Fig. 4；
Fig. 7 is the schematic block diagram of control section of the present invention；
Fig. 8 is the structural schematic diagram of another preferred embodiment of the present invention；
Fig. 9 is one schematic block diagram of control system of the present invention；
Figure 10 is the step schematic block diagram of method in the present invention.
Specific implementation mode
As shown in Figure 1, the commutation system 100 suitable for three phase network includes：First switch device 101, second switch dress
Set 102 and third switching device.Wherein, first switch device 101, which is used to one in three phase network being connected, is connected to three phase network
Load 102；Second switch device 102 is used between on or off first switch device 101 and the load 102 of three phase network
Connection；Controller 103 is for controlling first switch device 101 or/and second switch device 102 so that first switch device
101 only switch when second switch device 102 disconnects the connection between first switch device 101 and the load 102 of three phase network
It is connected to another phase of three phase network.
Specifically, first switch device 101 includes：First phase switch S11, on or off three phase network
The connection of first phase and second switch device 102；Two-phase switch S12, for the second phase on or off three phase network
With the connection of the first phase switch S11；Third phase switch S13 is opened for the third phase on or off three phase network with second
Close the connection of device 102；Wherein, controller 103 and the first phase switch S11, two-phase switch S12 and third phase switch S13 structures
At signal transmission so that the first phase switch S11, two-phase switch S12 and third phase switch S13 is controlled in the signal of controller 103
Lower action.
More specifically, the first phase switch S11 includes：First phase contact i, the first stationary contact h and the first movable contact g；The
Two-phase switch S12 includes：Second phase contact f, the second stationary contact e and the second movable contact d；Third phase switch S13 includes：Third phase
Contact c, third stationary contact b；
Wherein, the first phase contact i is connected to the first phase of three phase network；Second phase contact f is connected to the of three phase network
Two-phase；Third phase contact c is connected to the third phase of three phase network；First stationary contact h is connected to the second movable contact d, the second stationary contact
Point e is connected to third movable contact a；Third stationary contact b is hanging；First movable contact g is connected to second switch device 102 and be only capable of can
One be connected to switching in both the first phase contact i and the first stationary contact h；Second movable contact d is only capable of switchably connecting
One into both the second phase contact f and the second stationary contact e；Third movable contact a is only capable of being switchably coupled to third touching
One in both point c and the first stationary contact h.
More specifically, the first phase switch S11 includes the first calutron, and calutron is used for by by electric energy production
Magnetic field controls the first movable contact g and is connected to third phase contact c or the first stationary contact h.Two-phase switch S12 includes the second electromagnetic installing
It sets, calutron is used to be connected to third phase contact c or the second stationary contact by controlling the second movable contact d by the magnetic field of electric energy production
Point e.Third phase switch S13 includes third calutron, and calutron is used to move by controlling third by the magnetic field of electric energy production
Contact a is connected to third phase contact c or third stationary contact b.
As the scheme of specific implementation, the first phase switch S11, two-phase switch S12 and third phase switch S13 can be with
It is relay switch, their control terminals are connected to controller 103.
It alternatively, as shown in Fig. 2, can be only with two switch modules, specifically, single-phase switching switchs
S21, the connection for a phase and second switch device 202 on or off three phase network；Two-phase switches switch S22, uses
The connection of remaining two-phase and single-phase switching switch S21 on or off three phase network；Wherein, controller 203 with it is single-phase
Switch switch S21 and constitute signal transmission so that first mutually switchs with two-phase switching switch S22, two-phase switch and third phase switch
It is acted under the signal control of controller 203.Single-phase switching switch S21 includes：Single-phase phase contact f, single-phase stationary contact e and single-phase
Movable contact d；Two-phase switches switch S22：The first contact of two-phase b, two-phase the second contact c and two-phase movable contact a；It is wherein single-phase
Phase contact f is connected to the phase in three phase network, and single-phase stationary contact e is connected to two-phase movable contact a, and single-phase movable contact d is connected to
Second switch device 202 and it is only capable of one be switchably coupled in single-phase phase contact f and single-phase stationary contact e；Two-phase
One contact b and the second contact of two-phase c are respectively connected to remaining two-phase in three phase network, and two-phase movable contact a is only capable of switchably
One be connected in two-phase the first contact b and the second contact of two-phase c.In addition, single-phase switching switch S21 includes single-phase electromagnetic dress
It sets, single-phase electromagnetic device is used to be connected to single-phase phase contact f or single-phase by controlling single-phase movable contact d by the magnetic field of electric energy production
Stationary contact e.Two-phase switches switch S22：Two-phase calutron, single-phase electromagnetic device is for passing through the magnetic field by electric energy production
Control two-phase movable contact a is connected to two-phase the first contact b or the second contact of two-phase c.
As known from the above, no matter the first switch device in Fig. 1 or Fig. 2, act anyway, from mechanical structure
Realizing prevents phase fault, to realize the mechanical interlocked function of entire commutation system.
In addition, as shown in Fig. 2, second switch device 202 includes：Main path switch S23 is used on or off three phase network
And its connection between load；Bypass switch S24, in main path switch S23 on or off three phase network and its loading it
Between connection the both ends disconnected by main path switch S23 are connected before.
Bypass switch S24 is disconnected after main path switch S23 disconnects the connection between three phase network and its load.Main path switch
Bypass switch S24 is held on a period of time after S23 disconnects the connection between three phase network and its load.
Wherein, main path switch S23 is mechanical switch.Bypass switch S24 is electronic switch.Main path switch S23 can be after
Electric switch, bypass switch S24 can select bi-directional thyristor switch.
System shown in Figure 2 further includes：Detection device S204, the current or voltage for detecting three phase network；Wherein, it controls
The case where device 203 judges three phase network according to detection device, when the three-phase imbalance of three phase network, controller 203 first controls
Second switch device 202 disconnects another phase that then control first switch assembling device switching is connected to three phase network.Controller 203
Make second switch device 202 that first switch device 201 be connected after first switch device 201 completes switching to load with three phase network
Between connection.Controller 203 is first connected bypass switch S24, is then turned off main road and opens when disconnecting second switch device 202
S23 is closed, bypass switch S24 is finally disconnected.Bypass switch S24 is first connected when second switch device 202 is connected in controller 203,
Then main path switch S23 is connected, finally disconnects bypass switch S24.
As a kind of optional scheme, bypass switch S24 is silicon-controlled, an including control terminal.If main path switch S23
It needs to carry out closed procedure, then in the case where main path switch S23 is off, before being closed, controller 203 is to silicon-controlled transmission
Continuity signal makes silicon-controlled in voltage over zero conducting.It is silicon-controlled it is in the conduction state under, main path switch S23 is opened first
The operation of device 101 is closed to be closed after the completion.At this point, due to being parallel relationship between the silicon-controlled S23 with main path switch, controllable
Under silicon conducting state, the both ends pressure drop of load switch is zero, not will produce and shoves in load switch closure moment.In load switch
After closure, controller 203 stops to silicon-controlled transmission Continuity signal.Since impedance of the load switch in conducting is much smaller than controllable
Silicon, the load switch of conducting is by silicon-controlled short circuit.At this point, there is no electric currents to flow through on silicon-controlled, it is silicon-controlled to end naturally.Together
When, it is silicon-controlled to be maintained at off state since controller 203 stops to silicon-controlled transmission Continuity signal.
If main path switch S23 needs turn off operation, it is under closed state in main path switch S23, disconnects it
Before, controller 203 is to silicon-controlled transmission Continuity signal.When main path switch S23 is disconnected, silicon-controlled both ends generate immediately pressure drop and
Electric current, controlled silicon conducting.After main path switch S23 is successfully disconnected, controller 203 stops, to silicon-controlled transmission Continuity signal, making
Silicon-controlled cut-off.It is silicon-controlled when main path switch S23 is disconnected that main path switch S23 is short-circuit.
Impact when second switch device 202 can reduce commutation using the combination of main road and bypass switch S24 to load,
The harmful effect shoved with arcing is avoided simultaneously, increases equipment life.
As shown in figure 3, equipment life, first switch device 301 include single-phase in two such as Fig. 2 in order to further increase
Switch switch S31 and two-phase switches a switch S32 and backup circuit breaker S33；Backup circuit breaker S33 also include movable contact and
Two stationary contacts；Each contact of backup circuit breaker S33 by several electronic switches be connected respectively to single-phase switching switch and
The contact of two-phase switching switch or three phase network.
It is opened for example, the movable contact x of backup circuit breaker S33 is respectively connected to single-phase switching by electronic switch T31 and T32 respectively
Close the movable contact a of the movable contact d and dual phase electronic switch S32 of S31；One of backup circuit breaker S33 stationary contacts y passes through electronics
Switch T33 and T34 are connected respectively to the A phases in the movable contact a and three phase network of two-phase switching switch S32；Backup circuit breaker S33's
Another stationary contact z is respectively connected to the C phases in B phases and the three phase network in three phase network by electronic switch T35 and T36,
Controller can make backup circuit breaker S33 replace single-phase switching switch S31 or two-phase switching switch by controlling these electronic switches
S32；So service life is further improved, when being damaged in first switch device 301, backup circuit breaker can be utilized
S33 is continuing with.
As shown in Fig. 2, further including leak current detection device 204, leak current detection device 204 includes a current transformer
(CT).Current transformer works according to electromagnetic induction principle, includes the iron core of a closure.Load both ends firewire (L lines) and
Zero curve (N lines) is wound on the side of current transformer core in a reverse direction respectively, and around the number of turns it is identical.In the present embodiment
In, the coiling from top to bottom of L lines, the coiling from bottom to top of N lines.The other side solderless wrapped connection secondary winding of current transformer core, it is secondary around
Secondary current detection unit is connect in group.When loading normal work, the electric current that L lines flow through is identical as the size of current that N lines flow through,
It is zero in the induced current that secondary winding generates but since the two is wound in different directions on the same iron core.When leaking
When electric (such as human electric shock), a part for the electric current flowed through on L lines flows into the earth by conductive human body by is no longer pass through N lines,
At this point, the current value that L lines are flowed through with N lines just differs, at this point, just will produce induced current in secondary winding.The induced current
It, will be in current signal input controller 203 by a series of processing such as amplifying, filtering after being detected by secondary current detection unit.
Controller 203 judges whether the current signal received is abnormal, when current signal occurs abnormal, controller 203
First switch device and second switch device are cut off, to disconnect being electrically connected between power grid and load.
Another guard method includes：Controller 203 judges whether the current signal received is abnormal, when current signal goes out
When now abnormal, will selectively disconnect in the first, second switching device one of controller 203, to disconnect power grid and load
Between electrical connection.In safety protection program, the possibility of the more few then program error of operating procedure is smaller.And MCU cannot be real
Now parallel work-flow truly.Such setting ensure that when leakage current occurs time of opening operation for the first time and successfully
Rate.
For example, controller 203 can disconnect second switch device 202, to cut off first switch device 201 to load
Electric energy exports.After disconnecting second switch device 202, if second switch device 202 disconnects successfully, controller 203 will at this time
The signal that current transformer is sent out no longer is received, and the feedback contact of second switch device 202 will also feed back second switch
The cut-off signal of device 202.
At this point, if controller 203 can continue to receive the signal that current transformer is sent out, and the two signals it
Between difference be more than earth leakage protective threshold value, controller 203 start after sending out open command to second switch device 202 calculate should
The duration of state judges that second switch device 202 disconnects and loses if the duration of the state is more than a certain threshold value
It loses.At this point, controller 203 disconnects being electrically connected between first switch device 201 and three-phase electricity power grid, or disconnect first switch
Being electrically connected between device 201 and second switch device 202 is so that second switch device 202 cannot receive first switch device
The electric energy of 201 transmission.At this point, in the case where second switch device 202 disconnects and failing, remain able to by disconnecting first switch
Device 201 carries out duplicate protection, it is ensured that Electrical Safety to ensure to cut off output of the electric energy to human body.
Another kind judges that the mode of the disconnection success or not of second switch device 202 includes that controller 203 is to second switch
After device 202 sends open command, by one section of delay time, controller 203 judges the work shape of second switch device 202
State, if it is determined that second switch device 202 still to load transmission electric energy, then it is assumed that second switch device 202 disconnects failure.
At this point, controller 203 disconnects being electrically connected between first switch device 201 and three-phase electricity power grid, or disconnect first switch dress
Being electrically connected between 201 and second switch device 202 is set so that second switch device 202 cannot receive first switch device
The electric energy of 201 transmission.At this point, in the case where second switch device 202 disconnects and failing, remain able to by disconnecting first switch
Device 201 carries out duplicate protection, it is ensured that Electrical Safety to ensure to cut off output of the electric energy to human body.
In the case where second switch device 202 disconnects and failing, controller 203 can control first switch device 201
It disconnects.At this point, after controller 203 sends open command to first switch device 201, if controller 203 can continue to connect
The signal that current transformer is sent out is received, and the difference between the two signals is more than earth leakage protective threshold value, then controller 203
Start timing, if being more than a certain threshold value between institute's timing, judges that the first, second device all disconnects failure.At this point, controller
203 can to the earth leakage protective device of commutation exterior send protection signal so that the earth leakage protective device of commutation exterior into
Row protection operation.At this point, in the case where the first, second switching device 202 all fails, remain able to through the leakage outside operation
Non-electricity protector is to ensure to cut off output of the electric energy to human body, it is ensured that Electrical Safety.
At this point, if controller 203 can continue to receive the signal that current transformer is sent out, and the two signals it
Between difference be more than earth leakage protective threshold value, controller 203 opens after all sending out open command to the first, second switching device 202
The duration for beginning to calculate the state judges the first, second switch dress if the duration of the state is more than a certain threshold value
It sets 202 and all disconnects failure, that is, switch subsystem disconnects failure.In this case, controller 203 sends out alarm signal to outside
Number.External equipment can be earth leakage protective device, can also be audible-visual annunciator.Alarm signal is received in external earth leakage protective device
Afterwards, earth leakage protective operation can be carried out, the reliability of earth leakage protective operation is further increased.It is received in external audible-visual annunciator
After alarm signal, sound-light alarm can be carried out, the case where to remind user that electric leakage has occurred.
Fig. 8 is another embodiment of the commutation system with creepage protection function, including leak current detection device 204, leakage
Current sensing means includes the first, second two current transformers (CT).In the present embodiment, it is mutual to be wound on the first electric current for L lines
The iron core side of sensor, N lines are wound on the iron core side of the second current transformer.First, second current transformer core it is another
Solderless wrapped connection secondary winding is distinguished in side, and secondary current detection unit is connect in secondary winding.What two secondary current detection units detected
Current signal, respectively after the processing such as amplifying, filtering, input controller 203 respectively.When (such as human electric shock) is leaked electricity in generation
When, a part for the electric current flowed through on L lines is no longer pass through N lines by conductive human body flows into the earth, at this point, L lines and N line streams
The current value crossed just differs.
Controller 203 calculates the difference between two current signals, when difference is more than earth leakage protective threshold value, just thinks
Electric leakage is showed.
Controller 203 judges whether the current signal received is abnormal, when current signal occurs abnormal, controller 203
First switch device and second switch device are cut off, to disconnect being electrically connected between power grid and load.
Another guard method includes：Controller 203 judges whether the current signal received is abnormal, when current signal goes out
When now abnormal, will selectively disconnect in the first, second switching device one of controller 203, to disconnect power grid and load
Between electrical connection.In safety protection program, the possibility of the more few then program error of operating procedure is smaller.And MCU cannot be real
Now parallel work-flow truly.Such setting ensure that when leakage current occurs time of opening operation for the first time and successfully
Rate.
For example, controller 203 can disconnect second switch device 202, first switch device 201 and three is disconnected to cut off
Electrical connection between phase power grid disconnects being electrically connected for first switch device 201 and second switch device 202.
It disconnects between first switch device 201 and three phase network or first switch device 201 and second switch device
After electrical connection between 202, if first switch device 201 disconnects successfully, it is mutual will no longer to receive electric current for controller 203 at this time
The signal that sensor is sent out, and the feedback contact of first switch device 201 also will feed back first switch device to controller 203
201 cut-off signal.
At this point, if controller 203 can continue to receive the signal that leak current detection device 204 is sent out, and this two
Difference between a signal is more than earth leakage protective threshold value, and controller 203 is opened after sending out open command to first switch device 201
The duration for beginning to calculate the state judges first switch device 201 if the duration of the state is more than a certain threshold value
Disconnection failure, at this point, controller 203 controls second switch device 202 to disconnect the electric energy of the output of first switch device 201 and bear
Carry the electrical connection between RL.At this point, in the case where first switch device 201 disconnects and failing, remain able to by disconnecting second
Switching device 202 carries out duplicate protection, it is ensured that Electrical Safety to ensure to cut off output of the electric energy to human body.
Another kind judges that the mode of the disconnection success or not of switching device 11 includes that controller 203 is to first switch device
After 201 send open command, by one section of delay time, controller 203 judges the working condition of first switch device 201, such as
Fruit determines first switch device 201 and still transmits electric energy to second switch device 202, then it is assumed that first switch device 201 is disconnected
Failure is opened, controller 203 controls second switch device 202 to disconnect electric energy and the load of the output of first switch device 201 at this time
Between electrical connection.At this point, in the case where first switch device 201 disconnects and failing, remain able to by disconnecting second switch
Device 202 carries out duplicate protection, it is ensured that Electrical Safety to ensure to cut off output of the electric energy to human body.
In the case where first switch device 201 disconnects and failing, controller 203 can control second switch device 202
It disconnects.After controller 203 sends open command to second switch device 202, if controller 203 can continue to receive electricity
The signal that flow detection device 204 is sent out, and the difference between the two signals is more than earth leakage protective threshold value, then controller 203
Start timing, if being more than a certain threshold value between institute's timing, judges that the first, second device all disconnects failure.Controller 203 at this time
Protection signal can be sent to the earth leakage protective device of commutation exterior, so that the earth leakage protective device of commutation exterior is protected
Shield operation.At this point, in the case where the first, second switching device 202 all fails, remain able to protect by the electric leakage outside operation
Shield device is to ensure to cut off output of the electric energy to human body, it is ensured that Electrical Safety.
As shown in figure 4, further including leakage protection circuit 403.It is arranged between a phase C that can be in three phase network and ground connection
An one one way conducting device D1 and capacitor element C1, so, capacitor element C1 can save bit by bit certain electric energy.First
The connection that a controllable switch S41 is set between switching device and 41 second switch devices 42 to be turned on or off between them,
A leakage protection circuit 403 is arranged simultaneously goes control controllable switch S41, mutual inductor 404 that signal transmission will be detected to electric leakage
It includes detection module to protect circuit 403, leakage protection circuit 403, and the modules such as control module can go control controllably to open according to 404
Close S41.Leakage protection circuit 403 is powered by battery B1.As shown in figure 5, passing through self-charging road 601 and its single-phase conduction device
602, capacitor element C1 can be battery B1 chargings to which leakage protection circuit 403 has electric energy always.
As shown in figure 5, the entity structure of controllable switch S41 may include：Substrate 501, spring 502, connecting pin 503, two
A terminal 504 and 505, scotch 506 and 507, electromagnet 508 and 509.
Wherein, substrate 501 is fixedly installed, spring 502 into Fig. 5 under direction bias connecting pin 503, in connecting pin 503
It is divided into insulated part 503a and conductor part 503b, terminal 504 and 505 is separately connected first switch device and second switch device
505；It 503 position shown in the figure of connecting pin can Lead-through terminal 504 and 505；As one of which scheme, conductor part 503b can
Think graphite rod；Brake block 506 and 507 can be under the attraction of electromagnet 508 and 509, and into figure, left and right both direction is slided respectively
Dynamic, so spring 502, which pushes down on connecting pin 503, makes it disengage conduction position to be disconnected two terminals 504 and 505
Between connection.Brake block 506 and 507 some be tool it is magnetic.
The program is advantageous in that, when needing to disconnect, such as when leakage current is more than threshold value, spring 502 can be pushed quickly
Connecting pin 503 disconnects, while usually, and brake block 506 is because cannot move up and down and ensure reliability.
In addition, as shown in Fig. 2, leak current detection device 204 is connected to controller 203, specifically, leakage current test fills
It sets and both passes through mutual inductor CT1 including mutual inductor a CT1, firewire L and zero curve N shown in Fig. 2 to detect load R's
Leakage current.
Firewire L and zero curve N are detected respectively using two mutual inductors CT3 and CT4 as shown in Figure 8 alternatively, it is also possible to use.
As shown in Figure 1, when leakage current is more than threshold value, controller 103 can utilize first switch device 101 to disconnect and realize
Protection, specifically, the movable contact a actions of third phase switch S13 are connected to hanging stationary contact b, corresponding movable contact d and g
It is connected respectively to movable contact a and movable contact d, such first switch device 101 has been fully disconnected the access of all phases.
As shown in Fig. 2, when leakage current is more than threshold value, it can realize and protect by using the disconnection of second switch device 202
Shield, specifically, main path switch S23 and bypass switch S24 can be simultaneously switched off, it can also be in the way of protection, in order
Act main path switch S23 bypasses switch 24, the final disconnection for realizing second switch device 202.
As shown in fig. 7, controller 703 includes MCU and AND gate circuit 704, AND gate circuit 704 can be filled according to second switch
The case where setting main path switch S73 in 702 controls single-phase switching switch S71 and two-phase switching switch in first switch device 701
S72。
The input signal of AND gate circuit respectively includes the feedback signal of the signal and main path switch S23 of MCU.AND gate circuit will
After the two signals carry out with operation, to single-phase switching switch S71 and two-phase switching switch S72 outputs.Main path switch S23's
Feedback signal includes a kind of high level signal and a kind of low level signal, and AND gate circuit is by the signal of MCU and the high level signal
After carrying out with operation, the signal of output and the signal of MCU are consistent；AND gate circuit believes the signal of MCU and low level
Number carry out with operation after, the output signal of AND gate circuit maintains low level.It is low level in the output signal of AND gate circuit
When, single-phase switching switch S71 and two-phase switching switch S72 cannot switch over operation, that is, first switch device 101 is in main road
Switch S23 can not carry out commutation operation when in the conduction state.
To sum up, if load switch is off, the signal of feedback terminal is high level signal, first switch dress
Normal commutation can be carried out by setting 101；If load switch is in closed state, the signal of feedback terminal is low level signal,
First switch device 101 cannot carry out commutation.First switch device 101 is off lower progress commutation behaviour in load switch
Make, the impact of shoving of switching generation can be reduced, extends switch life.In addition, being also avoided that first switch device 101 is each
Due to short-circuit caused by arcing between a terminal.
As shown in figure 9, as before, the probability of commutation system failure of the invention reduces, because can set in the controller
Wireless communication module is set, them is made to constitute data interaction with cloud server, only when controller recognizes failure,
Prompting manually repairs and replaces the workload for reducing manual inspection.Meanwhile it can be united by wireless communication module
The working condition of each commutation system is counted, to be subject to statistics and analysis to the imbalance of entire power grid on the whole.
As shown in Figure 10, based on above hardware plan, the present invention provides a kind of phase change method, specifically, this method
Including：
It is separate to detect present apparatus place；
Controller judges whether to need to switch to another phase of three phase network；
Disconnect second switch device；
Judge that second switch device disconnects to complete；
The switching of first switch device is set to be connected to the target phase of three phase network；
Judge whether first switch device is connected to target phase；
Second switch device is connected；
Judge whether to be connected；
Commutation process is completed.
As concrete scheme, this method further includes：Judge whether successful switch disconnects in three phase network first switch device
A phase；It alarms if failure；Judge whether successful switch is connected to another phase in three phase network to first switch device；Such as
Fruit failure is then alarmed.
Furthermore it is possible to using the first movable contact of field drives of electric energy production, the second movable contact and third movable contact.In master
Keep bypass switch (second switch device) in the conduction state before way switch action.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the invention is not limited in any way above-described embodiment, all to be obtained by the way of equivalent substitution or equivalent transformation
Technical solution is all fallen in protection scope of the present invention.
Claims (10)
1. a kind of commutation system suitable for three phase network, it is characterised in that：
The commutation system suitable for three phase network includes：
First switch device is connected to the load of the three phase network for one in three phase network to be connected；
Second switch device, for the company described on or off between first switch device and the load of the three phase network
It connects；
Controller, for controlling the first switch device or/and the second switch device so that the first switch device
Only switch when the second switch device disconnects the connection between the first switch device and the load of the three phase network
It is connected to another phase of the three phase network.
2. the commutation system according to claim 1 suitable for three phase network, it is characterised in that：
The first switch device includes：
First phase switchs, the connection for the first phase and the second switch device in three phase network described on or off；
Two-phase switch, the connection switched with first phase for the second phase in three phase network described on or off；
Third phase switchs, the connection for third phase and the second switch device in three phase network described on or off；
Wherein, the controller is switched with first phase, and two-phase switch and third phase switch constitute signal transmission so that institute
The first phase switch, two-phase switch and third phase switch is stated to act under the signal control of the controller.
3. the commutation system according to claim 2 suitable for three phase network, it is characterised in that：
First phase switchs：First phase contact, the first stationary contact and the first movable contact；The two-phase switch includes：
Second phase contact, the second stationary contact and the second movable contact；The third phase switchs：Third phase contact, third stationary contact and
Third movable contact；
Wherein, first phase contact is connected to the first phase of the three phase network；Second phase contact is connected to described three
Second phase of phase power grid；The third phase contact portion to the three phase network third phase；First stationary contact is connected to
Second movable contact, second stationary contact are connected to the third movable contact；The third stationary contact is hanging；Described first
Movable contact is connected to the second switch device and is only capable of being switchably coupled to first phase contact and the first stationary contact two
One in person；Second movable contact is only capable of being switchably coupled in both second phase contact and the second stationary contact
One；The third movable contact is only capable of one be switchably coupled in both the third phase contact and first stationary contact.
4. the commutation system according to claim 3 suitable for three phase network, it is characterised in that：
The first phase switch includes the first calutron, and the calutron is used for by controlling institute by the magnetic field of electric energy production
It states the first movable contact and is connected to the third phase contact or first stationary contact.
5. the commutation system according to claim 3 suitable for three phase network, it is characterised in that：
The two-phase switch includes the second calutron, and the calutron is used for by controlling institute by the magnetic field of electric energy production
It states the second movable contact and is connected to the third phase contact or second stationary contact.
6. the commutation system according to claim 3 suitable for three phase network, it is characterised in that：
The third phase switch includes third calutron, and the calutron is used for by controlling institute by the magnetic field of electric energy production
It states third movable contact and is connected to the third phase contact or the third stationary contact.
7. the commutation system according to claim 2 suitable for three phase network, it is characterised in that：
The first switch device includes：
Single-phase switching switch, the connection for a phase and the second switch device in three phase network described on or off；
Two-phase switching switch, the company for remaining two-phase and the single-phase switching switch in three phase network described on or off
It connects；
Wherein, the controller constitutes signal transmission so that first phase with the single-phase switching switch and two-phase switching switch
Switch, two-phase switch and third phase switch act under the signal control of the controller.
8. the commutation system according to claim 7 suitable for three phase network, it is characterised in that：
The single-phase switching, which switchs, includes：Single-phase phase contact, single-phase stationary contact and single-phase movable contact；The two-phase switching switch packet
It includes：The first contact of two-phase, the second contact of two-phase and two-phase movable contact；The wherein described single-phase phase contact is connected to the three phase network
In a phase, the single-phase stationary contact is connected to the two-phase movable contact, and the single-phase movable contact is connected to the second switch
Device and it is only capable of one be switchably coupled in the single-phase phase contact and single-phase stationary contact；The first contact of the two-phase
It is respectively connected to remaining two-phase in the three phase network with the second contact of the two-phase, the two-phase movable contact is only capable of can be switched
Ground is connected to one in the second contact of the first contact of the two-phase and the two-phase.
9. the commutation system according to claim 8 suitable for three phase network, it is characterised in that：
The single-phase switching switch includes single-phase electromagnetic device, and the single-phase electromagnetic device is for passing through the magnetic field by electric energy production
It controls the single-phase movable contact and is connected to the single-phase phase contact or single-phase stationary contact.
10. the commutation system according to claim 8 suitable for three phase network, it is characterised in that：
The two-phase switching, which switchs, includes：Two-phase calutron, the two-phase calutron is for passing through the magnetic by electric energy production
Field controls the two-phase movable contact and is connected to the second contact of the first contact of the two-phase or two-phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810292111.2A CN108448600A (en) | 2018-03-30 | 2018-03-30 | Commutation system suitable for three phase network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810292111.2A CN108448600A (en) | 2018-03-30 | 2018-03-30 | Commutation system suitable for three phase network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108448600A true CN108448600A (en) | 2018-08-24 |
Family
ID=63198221
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810292111.2A Pending CN108448600A (en) | 2018-03-30 | 2018-03-30 | Commutation system suitable for three phase network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266025A (en) * | 2019-07-03 | 2019-09-20 | 青岛鼎信通讯股份有限公司 | A kind of three-phase intelligent phase-change switch device and control method optimizing switch topology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522760A (en) * | 2011-12-03 | 2012-06-27 | 山东卓尔电气有限公司 | Method for switching phase lines of three-phase circuit and capable of preventing inter-phase short-circuit and phase change switch device |
| EP2672603A1 (en) * | 2012-06-06 | 2013-12-11 | ABB Technology AG | A device for connecting a single-phase device into a multiphase electric network |
| CN205725695U (en) * | 2016-04-27 | 2016-11-23 | 深圳市因特普科技有限公司 | Three-phase switching switch |
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2018
- 2018-03-30 CN CN201810292111.2A patent/CN108448600A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522760A (en) * | 2011-12-03 | 2012-06-27 | 山东卓尔电气有限公司 | Method for switching phase lines of three-phase circuit and capable of preventing inter-phase short-circuit and phase change switch device |
| EP2672603A1 (en) * | 2012-06-06 | 2013-12-11 | ABB Technology AG | A device for connecting a single-phase device into a multiphase electric network |
| CN205725695U (en) * | 2016-04-27 | 2016-11-23 | 深圳市因特普科技有限公司 | Three-phase switching switch |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110266025A (en) * | 2019-07-03 | 2019-09-20 | 青岛鼎信通讯股份有限公司 | A kind of three-phase intelligent phase-change switch device and control method optimizing switch topology |
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