CN208690936U - A kind of seamless switching type phase-change switch - Google Patents
A kind of seamless switching type phase-change switch Download PDFInfo
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- CN208690936U CN208690936U CN201821315501.9U CN201821315501U CN208690936U CN 208690936 U CN208690936 U CN 208690936U CN 201821315501 U CN201821315501 U CN 201821315501U CN 208690936 U CN208690936 U CN 208690936U
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Abstract
The utility model provides a kind of seamless switching type phase-change switch, it includes that control device and three identical switch module A, switch module B being connected on power grid A, B, C line and switch module C, the other end of the switch module A, the switch module B and the switch module C are connected on the firewire of same load；Each switch module includes miniature circuit breaker, the first power diode, first contactor and second contactor, it is in parallel with the first contactor after first power diode and second contactor series connection, the miniature circuit breaker connects the shunt circuit of first power diode, the second contactor and first contactor composition, and the control device controls the connection miniature circuit breaker, the first contactor and the second contactor respectively.The utility model has the advantages that the commutation time is short, commutation process is reliable and stable.
Description
Technical field
The utility model relates to a kind of phase-change switches, specifically, relate to a kind of seamless switching type phase-change switch.
Background technique
There are a large amount of single-phase load in low-voltage network, due to single-phase load distribution it is unbalanced different with investment when
Property, so that three-phase load unbalance becomes a comparison distinct issues in low voltage electric network operation and maintenance.Three-phase load unbalance
Grid loss will be increased, seriously affect power supply quality, low voltage electric network, distribution transformer, 10~35kV high-tension line will be caused
Harm.With the development of the social economy, the increasingly raising of people's living standard, a large amount of powerful single-phase household electrical appliance such as: it is empty
Device, water heater, micro-wave oven, electromagnetic oven etc. is adjusted to enter average family, these household electrical appliance bring comfortable, convenient, fast
While life, single-phase load surge is caused, the influence of low-voltage power supply system three-phase load unbalance has been further exacerbated by.It is low
The three-phase imbalance of voltage electric grid is always one of the main problem for perplexing power supply unit.
At present frequently be " very fast commutation+phase angle tracking " phase change method, but the commutation time of this method is longer,
Most fastly be 6.6ms, although and commutation process will not power down, will appear the phenomenon that light bulb flashes slightly, influencing user just
Common electricity.
In order to solve the above problems, people are seeking always a kind of ideal technical solution.
Summary of the invention
The purpose of this utility model is that in view of the deficiencies of the prior art, to provide, a kind of commutation time is short, commutation process
Reliable and stable seamless switching type phase-change switch.
To achieve the goals above, the technical scheme adopted by the utility model is a kind of seamless switching type phase-change switch,
Including control device and three identical switch module A, the switch module B and switch module C that are connected on power grid A, B, C line,
The other end of the switch module A, the switch module B and the switch module C are connected on the firewire of same load；Each
Switch module includes miniature circuit breaker, the first power diode, first contactor and second contactor, two pole of the first power
In parallel with the first contactor after pipe and second contactor series connection, the miniature circuit breaker connects first power two
The shunt circuit of pole pipe, the second contactor and first contactor composition, the control device control connection institute respectively
State miniature circuit breaker, the first contactor and the second contactor.
Based on above-mentioned, the switch module further includes third contactor and the second power diode, second power two
Pole pipe the first power diode reverse phase setting relatively, after the third contactor is connected with second power diode and
The series loop of first power diode and second contactor composition is in parallel, and control device control connection institute
State third contactor.
Based on above-mentioned, the control device includes three voltage detection units, a current detecting unit, carrier communication mould
Block and control module, one end of three voltage detection units are separately connected power grid A, B, C three-phase and switch module A, switch module B
Between switch module C, the other end of three voltage detection units is both connected on zero curve；The current detecting unit setting exists
Switch module and load between, the carrier communication module respectively with three voltage detection units, the current detecting list
It is first to be connected with the control module, for by the voltage detection unit, the current detecting unit acquisition voltage signal and
Current signal is uploaded to the control module, and receives the commutation switching command that the control module issues；The switching molding
Block A, the switch module B and the switch module C are also respectively connected with the carrier communication module, are referred to according to commutation switching
It enables and carries out commutation operation.
The utility model has substantive features and progress compared with the prior art, specifically, the commutation of the utility model
Process is the characteristic using three-phase electricity and the single-phase conducting of diode, forces it from commutation, commutation process does not have a power failure, and can accomplish nothing
Commutation, no arc commutation are stitched, user's " noninductive commutation " accomplishes load not power off 0ms commutation, not will cause power failure and voltage
Temporarily drop, on the normal electricity consumption of user entirely without influence, and to the various loads reliable commutation of energy, therefore the utility model is true
Entire platform area is just set to run on three-phase equilibrium state, the neutral current of distribution network significantly reduces, transformer and power supply line
Loss greatly reduce；Simultaneously because the equilibrium of main line electric current and the reduction of neutral current, terminal voltage is also obtained significantly
It is promoted, the operation in platform area can be significantly improved.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment 1.
Fig. 2 is the three-phase voltage waveform diagram of the utility model embodiment 1.
Fig. 3 is the commutation process load voltage waveform figure of the utility model embodiment 1.
Fig. 4 is the structural schematic diagram of the utility model embodiment 2.
Fig. 5 is the three-phase voltage waveform diagram of the utility model embodiment 2.
Fig. 6 is the commutation process load voltage waveform figure of the utility model embodiment 2.
In figure: 1. switch module A；2. switch module B；3. switch module C.
Specific embodiment
Below by specific embodiment, the technical solution of the utility model is described in further detail.
As shown in Figure 1, the utility model provides a kind of seamless switching type phase-change switch, which includes control device
With three identical switch module A, the switch module B and switch module C being connected on power grid A, B, C line, the switch module
A, the other end of the switch module B and the switch module C are connected on the firewire of same load；Each switch module includes
Miniature circuit breaker QFA/QFB/QFC, the first power diode DA/DB/DC, first contactor KA/KB/KC and second contactor
KA1/KB1/KC1, the first power diode DA/DB/DC and the second contactor KA1/KB1/KC1 series connection after with it is described
First contactor KA/KB/KC is in parallel, miniature circuit breaker QFA/QFB/QFC connection the first power diode DA/DB/
The shunt circuit of DC, the second contactor KA1/KB1/KC1 and first contactor KA/KB/KC composition, the control dress
It sets control respectively and connects the miniature circuit breaker QFA/QFB/QFC, the first contactor KA/KB/KC and second contact
Device KA1/KB1/KC1.
Specifically, the control device includes three voltage detection units, current detecting unit, a carrier communication module
And control module, one end of three voltage detection units be separately connected power grid A, B, C three-phase and switch module A, switch module B and
Between switch module C, the other end of three voltage detection units is both connected on zero curve；The current detecting unit setting is being opened
Close modules A, switch module B, switch module C and load between, the carrier communication module respectively with three voltage detectings
Unit, the current detecting unit are connected with the control module, are used for the voltage detection unit, the current detecting list
The voltage signal and current signal of member acquisition are uploaded to the control module, and receive the commutation that the control module issues and cut
Change instruction；The switch module A, the switch module B and the switch module C are also respectively by described in RS485 communication connection
Carrier communication module carries out commutation operation according to the commutation switching command.
Preferably, the voltage detection unit is Hall voltage sensor, and the current detecting unit is Hall current biography
Sensor, the second contactor are magnetic latching relay.
The working method of the utility model are as follows:
Before carrying out commutation, the phase-change switch will carry out power transmission debugging, specific steps are as follows:
1) mode bit of each contactor in three switch modules is subjected to Initialize installation；
2) the miniature circuit breaker KA of the switch module A is closed, the auxiliary control source of switch module A is connected；
3) control module applies a backward voltage to the coil of the first contactor, makes its disconnection；
4) at this point, observing the output voltage and electric current of the switch module A, confirm the output voltage of the switch module A
Show all be to show that the state initialization of the first contactor is completed after zero with electric current；
5) the switch module B phase miniature circuit breaker KB is closed, then with it is 2) complete to the identical operating method of 4) step
At the state initialization of the second contactor；
6) identical operation similarly, is carried out to the switch module C phase miniature circuit breaker KC, completes the third contact
The state initialization of device.
The power transmission debugging is very succinct, is not necessarily to professional, thoroughly solves because contactor " initialization " mode bit is not true
Power grid security problem and debugging difficult problem fixed, that caused installation short circuit causes, substantially increase installation effectiveness, reduce work
Cheng Chengben.
Under normal circumstances, when certain phase steady operation, first contactor on the switch module of only current phase and miniature disconnected
Road device is closure.
Hall voltage sensor acquire power grid A, B, C three-phase voltage signal, through the control module processing after obtain A,
B, the voltage-phase of C three-phase forms three-phase waveform diagram, as shown in Figure 2；
(1) when the switching command that the control module receives is that A phase is switched to B phase or B phase is switched to C phase or C is tangent
A phase is changed to, switching moment point is chosen by the following method: the counter interval t0 sampling in a complete current phase sinusoidal cycles
Once, the voltage of the current phase of power grid detected when Hall voltage sensor enters zero point from negative value, and the zero point is as first
Sampled point, counter are denoted as t1, and current the last one preceding sampled point counter mutually equal with incision phase voltage is denoted as t2；Currently
Sampled point counter of the voltage of phase for the first time less than 0 is denoted as t3；Cutting phase voltage, first sampled point less than 0 counts again
Device is calculated as t4；
After receiving commutation order, the control module is started to work, and mutually enters next complete sinusoidal cycles to current
When, counter starts counting.
Counter disconnects the first contactor of the switch module of current phase between t1 and t2, and is closed current phase
The second contactor of the switch module of the second contactor and incision phase of switch module；Due to the unilateal conduction characteristic of diode,
Between t1 the and t2 moment, the voltage of current phase is higher than the voltage of incision phase, therefore although the switch module of current phase second
Contactor and the second contactor of switch module for cutting phase are all closed, but only open the diode in the switch module of current phase
There is electric current to flow through, after having served as the t2 moment, because the voltage of incision phase is higher than the voltage of current phase, cuts the switch module of phase
In diode there is electric current to flow through, and the diode reverse voltage in the switch module of current phase clamps cut-off.
Counter disconnects the second contactor of the switch module of current phase between t3 and t4, and closed phase
The first contactor of switch module；
Counter disconnects the second contactor of the switch module of incision phase after having crossed t4, and so far commutation switching finishes,
As shown in figure 3, realizing the seamless commutation of 0ms, load does not power off commutation process load voltage waveform.
Embodiment 2
It is in place of the present embodiment and the difference of embodiment 1: as shown in figure 4, the switch module further includes that third contacts
Device KA2/KB2/KC2 and the second power diode DA2/DB2/DC2, the second power diode DA2/DB2/DC2 is with respect to institute
State the setting of the first power diode DA1/DB1/DC1 reverse phase, the third contactor KA2/KB2/KC2 and second power two
Pole pipe DA2/DB2/DC2 series connection after with the first power diode DA1/DB1/DC1 and the second contactor KA1/KB1/
The series loop of KC1 composition is in parallel, and control device control connects the third contactor KA2/KB2/KC2.
The working method of the embodiment are as follows:
As shown in figure 5, when the switching command that the control module receives is that A phase is switched to B phase or B phase is switched to C phase
Or C phase is switched to A phase, switching moment point is chosen by the following method: the counter interval t0 sampling one in current phase sinusoidal cycles
It is secondary, and judge that the voltage for the current phase of power grid that Hall voltage sensor detects is first to enter zero point or elder generation from positive value from negative value
Into zero point, if entering zero point from negative value, then commutation is carried out according to the commutation step in embodiment 1；If entering from positive value
Zero point, then the zero point is denoted as t1 as first sampled point, counter, the last one before current phase is equal with incision phase voltage
Sampled point counter is denoted as t2；The sampled point counter that the voltage of current phase is greater than 0 for the first time is denoted as t3；Cut phase voltage again
First sampled point counter counts greater than 0 is t4；
After receiving commutation order, the control module is started to work, and mutually enters next complete sinusoidal cycles to current
When, counter starts counting.
Counter disconnects the first contactor of the switch module of current phase between t1 and t2, and is closed current phase
The third contactor of the switch module of the third contactor and incision phase of switch module；Due to the unilateal conduction characteristic of diode,
Between t1 the and t2 moment, the voltage of current phase lower than incision phase voltage, therefore although the switch module of current phase third
The third contactor of contactor and the switch module of incision phase is all closed, but the second power in the switch module of only current phase
Diode has electric current to flow through, and after having served as the t2 moment, because the voltage of incision phase is lower than the voltage of current phase, cuts opening for phase
The second power diode closed in module has electric current to flow through, and the second power diode in the switch module of current phase is reversely electric
Pressure clamp cut-off.
Counter disconnects the third contactor of the switch module of current phase between t3 and t4, and closed phase
The first contactor of switch module；
Counter disconnects the third contactor of the switch module of incision phase after having crossed t4, and so far commutation switching finishes,
As shown in fig. 6, realizing the seamless commutation of 0ms, load does not power off commutation process load voltage waveform.
By the design of the third contactor and second power diode so that at the time of two-phase voltage is equal
The scene that 120 ° of phase hit also extends to negative voltage field, it is not necessary to wait until next complete sinusoidal cycles, guarantee to use
The continuity of electricity.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the utility model rather than limit it
System；Although the utility model has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should
Understand: specific implementation of the utility model can still be modified or is equally replaced to some technical characteristics
It changes；Without departing from the spirit of technical solutions of the utility model, should all cover in the claimed technical solution of the utility model
In range.
Claims (3)
1. a kind of seamless switching type phase-change switch, it is characterised in that: including control device and be connected on power grid A, B, C line three
A identical switch module A, switch module B and switch module C, the switch module A, the switch module B and the switch
The other end of module C is connected on the firewire of same load；Each switch module includes miniature circuit breaker, two pole of the first power
With described first after pipe, first contactor and second contactor, first power diode and second contactor series connection
Contactor is in parallel, and the miniature circuit breaker connects first power diode, the second contactor and first contact
The shunt circuit of device composition, the control device control respectively connects the miniature circuit breaker, the first contactor and described
Second contactor.
2. seamless switching type phase-change switch according to claim 1, it is characterised in that: the switch module further includes third
Contactor and the second power diode, the relatively described first power diode reverse phase setting of second power diode are described
Third contactor forms after connecting with second power diode with first power diode and the second contactor
Series loop it is in parallel, and control device control connects the third contactor.
3. seamless switching type phase-change switch according to claim 1 or 2, it is characterised in that: the control device includes three
A voltage detection unit, a current detecting unit, carrier communication module and control module, one end of three voltage detection units
It is separately connected between power grid A, B, C three-phase and switch module A, switch module B and switch module C, three voltage detection units
The other end is both connected on zero curve；The current detecting unit is arranged between switch module and load, the carrier communication mould
Block is connect with three voltage detection units, the current detecting unit and the control module respectively, is used for the electricity
Pressure detection unit, the voltage signal of current detecting unit acquisition and current signal are uploaded to the control module, Yi Jijie
Receive the commutation switching command that the control module issues；The switch module A, the switch module B and the switch module C are also
It is separately connected the carrier communication module, commutation operation is carried out according to the commutation switching command.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821315501.9U CN208690936U (en) | 2018-08-15 | 2018-08-15 | A kind of seamless switching type phase-change switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821315501.9U CN208690936U (en) | 2018-08-15 | 2018-08-15 | A kind of seamless switching type phase-change switch |
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| Publication Number | Publication Date |
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| CN208690936U true CN208690936U (en) | 2019-04-02 |
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| CN201821315501.9U Active CN208690936U (en) | 2018-08-15 | 2018-08-15 | A kind of seamless switching type phase-change switch |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098627A (en) * | 2019-06-17 | 2019-08-06 | 重庆大全泰来电气有限公司 | A kind of commutation device, method, system and three-phase power balance method, system |
| CN110867877A (en) * | 2019-12-09 | 2020-03-06 | 国网上海市电力公司 | Seamless smooth switch in load commutation process |
-
2018
- 2018-08-15 CN CN201821315501.9U patent/CN208690936U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098627A (en) * | 2019-06-17 | 2019-08-06 | 重庆大全泰来电气有限公司 | A kind of commutation device, method, system and three-phase power balance method, system |
| CN110867877A (en) * | 2019-12-09 | 2020-03-06 | 国网上海市电力公司 | Seamless smooth switch in load commutation process |
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