CN206471834U - Distribution transforming three-phase imbalance governing system - Google Patents
Distribution transforming three-phase imbalance governing system Download PDFInfo
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- CN206471834U CN206471834U CN201621280250.6U CN201621280250U CN206471834U CN 206471834 U CN206471834 U CN 206471834U CN 201621280250 U CN201621280250 U CN 201621280250U CN 206471834 U CN206471834 U CN 206471834U
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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 utility model provides a kind of distribution transforming three-phase imbalance governing system, including distribution transformer terminals and phase-change switch, the distribution transformer terminals are connected to the line outlet end of distribution transforming, the phase-change switch is connected between distribution transforming and customer charge, the distribution transformer terminals are communicated to connect by way of wirelessly or electrically power carrier wave with the phase-change switch, and the distribution transformer terminals are communicated to connect by way of GPRS or optical fiber with Surveillance center.The utility model implements simple, and cost is low, the problem of solving load unbalanced from root while power supply reliability is ensured, distribution transformer is played a very good protection, can effectively be reduced because of the harm that imbalance is brought.
Description
Technical field
The utility model belongs to power distribution technical field, and in particular to a kind of distribution transforming three-phase imbalance governing system.
Background technology
At present, be widely used in vast town and country distribution transformer by after 10kV transformations with 380/220V three-phase four
Line system is to customer power supply.Due to a variety of different features of user, in production, household electricity, distribution transformer institute
The power consumption characteristics of the user of supply are different, add load and change the factor such as big, distribution transformer three-phase often occurs and born in operation
Carry unbalanced situation.Three distribution transformers, which are chronically at three-phase imbalance running status, will influence the life-span of transformer, increase
Plus the loss of transformer, also result in that a series of such as line voltage declines, flickering, power factor be low, line loss is increased
Problem.Influence of the three-phase load unbalance to power distribution station mainly has four aspects：
1) cause distribution transformer and charge circuit that increase is lost；
2) quality of voltage of the heavily loaded phase in power distribution station declines；
3) distribution transformer processing reduction, energy conversion efficiency declines；
4) three-phase imbalance operation causes distribution transformer zero-sequence current to increase, and caused eddy-current loss makes distribution transformer
Running temperature is raised, and jeopardizes transformer safety and life-span.
By analyzing the basic reason of three-phase imbalance, to be substantially exactly that loaded network is asymmetric cause, as long as by load
Network symmetrization, so that it may so that transformer symmetrical operation.The asymmetric three-phase load electric current of transformer can use symmetrical component method
Positive sequence, three groups of symmetrical components of negative phase-sequence and zero sequence are decomposed into, if eliminating negative phase-sequence and zero sequence, three-phase current will be symmetrical, but it is real
Apply more difficult, need to additionally increase power electronic devices.In fact, in low-voltage network particularly rural power grids, because distribution becomes
Depressor is numerous, installs load in every transformer terminal and adjusts the benefit network equipment and unrealistic, so the side of the adjustment three-phase imbalance
Formula all has the problem of cost of implementation is excessive.It is usually taken after the single-phase load for causing three-phase imbalance is powered off, switching is arrived
The mode of another phase adjusts three-phrase burden balance.But if the mode for taking traditional manual to switch, then during the power failure of load
Between often will be more than 30 minutes, this greatly reduces the power supply reliability of user.
Automatic horizontal control system (the publication number of a set of distribution three-phase imbalance of patent：CN204947606U a kind of bag) is disclosed
Data concentrator and self-level(l)ing device are included, the data concentrator is arranged on the outlet port of the station, and the station passes through wire
Connect the input of self-level(l)ing device.This system only carries out three-phase injustice by installing self-level(l)ing device in outlet port
Weighing apparatus is administered, and data concentrator is to play data acquisition effect, but causes three-phase load to distribute because early stage layout of roads is inconsiderate
Unbalanced problem, and regular quick adjustment need not be carried out to three-phase load, often need to only adjust just can once protect
The three-phase equilibrium of long period is demonstrate,proved, the device can not realize in real time flexibly selection load commutation switching, it is to avoid meaningless commutation.
Utility model content
The purpose of this utility model is to provide a kind of distribution transforming three-phase imbalance governing system, implements simple, cost is low, can be
The problem of ensureing to solve load unbalanced from root while power supply reliability, good guarantor is served to distribution transformer
Shield is acted on, and can effectively be reduced because of the harm that imbalance is brought.
The utility model provides following technical scheme：
A kind of distribution transforming three-phase imbalance governing system, including distribution transformer terminals and phase-change switch, the distribution transformer terminals are connected to
The line outlet end of distribution transforming, the phase-change switch is connected between distribution transforming and customer charge, and the distribution transformer terminals pass through wirelessly or electrically
The mode of power carrier wave and the phase-change switch are communicated to connect, and the distribution transformer terminals are by way of GPRS or optical fiber and Surveillance center
Communication connection；
The distribution transformer terminals include the first CPU and be connected respectively with the first CPU acquisition module, communication module, after
Platform communication module and charactron, the line outlet end of acquisition module connection connection distribution transforming is changed described in the communication module connection
Mutually switch, the Background communication module is communicated to connect with Surveillance center；
The phase-change switch includes power module, the 2nd CPU and the electrical quantity with the 2nd CPU interconnections is adopted respectively
Collect module, communication module, split-phase switch state acquisition module and commutation handover module, the power module supplies electricity to described second
The outlet connection of CPU, the electrical quantity acquisition module and distribution transforming, the 2nd CPU passes through the communication module and the distribution transforming
Terminal communication is connected, and the split-phase switch state acquisition module is connected with the commutation handover module.
It is preferred that, the distribution transformer terminals also include keystroke handling module, the keystroke handling module connection described first
Distribution transformer terminals can directly be carried out parameter setting, convenient maintenance and control by CPU manually.
It is preferred that, the acquisition module uses current transformer, the current transformer connect respectively the first CPU and
The line outlet end of distribution transforming, gathers distribution transformer low-pressure side three-phase current.
It is preferred that, the phase-change switch also includes LED charactrons, the LED charactrons and the electrical quantity acquisition module
Connection, can show voltage, load current value and currently run it is separate, in combination with bottom button can be set relevant parameter,
Can manually commutation.
It is preferred that, the power module uses alternating current-direct current inversion packaging power, and dust and moisture is anti-oxidation, and AC and DC is dual-purpose,
External input voltage exports the DC voltage that the present apparatus needs, i.e. 5V behind anti-interference filtration loop using inverter.
It is preferred that, the electrical quantity acquisition module includes voltage transformer, current transformer, low-pass filter circuit, timing
Device, signal sample circuit, A/D converter and frequency-tracking sample circuit, the voltage transformer and the current transformer
The output end of the outlet connection of input and distribution transforming, the voltage transformer and the current transformer and LPF electricity
Road is connected, and the low-pass filter circuit is connected with the signal sample circuit and the timer respectively, the timer connection
2nd CPU, the signal sample circuit is connected with the A/D converter, and the A/D converter is adopted with the frequency-tracking
Sample circuit is connected, and the frequency-tracking Acquisition Circuit is connected with the LED charactrons.
It is preferred that, the split-phase switch state acquisition module includes the photoisolator and data buffer being sequentially connected,
The photoisolator connects the commutation handover module, and the data buffer connects the 2nd CPU, the data buffering
Software debounce is provided between device and the 2nd CPU, can in the Interruption of software read switch amount input state, by suitable
When the delay debounce of time, confirmation signal is in stable condition.
The beneficial effects of the utility model are：The adjustment of three-phase load autobalance is completed using powered commutation device, is changed
Phase device access A, B, C three-phase voltage, by internal conversion mechanism only provide it is a certain it is single-phase used to load, when distribution transforming occur three
Powered commutation device receives instruction and carries out commutation to reach the purpose of balancing the load when mutually uneven；Accurate zero passage phase shift control
System, identical with the switching waveform that full silicon controlled module operating passing zero is switched, full sine wave switching, no harmonic wave is produced, switching no swell
Stream；Compared with combination switch, the controllable silicon of fragility is eliminated, reliability is high；Reaction time is quick, and making time is less than 60 points
Clock；No-flashy-flow, disjunction are put into without arcing, it is not necessary to safeguard；Simple installation, it is similar with various contactors and combination switch installation.
Brief description of the drawings
Accompanying drawing is used for providing further understanding to of the present utility model, and constitutes a part for specification, with this practicality
New embodiment is used to explain the utility model together, does not constitute to limitation of the present utility model.In the accompanying drawings：
Fig. 1 is the utility model principle schematic diagram；
Fig. 2 is distribution transformer terminals principle schematic diagram of the present utility model；
Fig. 3 is phase-change switch principle schematic diagram of the present utility model；
Fig. 4 is electrical quantity acquisition module principle schematic diagram of the present utility model；
Fig. 5 is split-phase switch state acquisition module principle schematic diagram of the present utility model；
Fig. 6 is phase-change switch operation principle schematic diagram of the present utility model；
Fig. 7 is phase-change switch job step flow chart of the present utility model.
Embodiment
As shown in figure 1, distribution transforming three-phase imbalance governing system, including distribution transformer terminals and phase-change switch, distribution transformer terminals connection
In the line outlet end of distribution transforming, phase-change switch is connected between distribution transforming and customer charge, and distribution transformer terminals pass through wirelessly or electrically power carrier wave
Mode and phase-change switch communicate to connect, distribution transformer terminals are communicated to connect by way of GPRS or optical fiber with Surveillance center.With
Electricity becomes side and installs a set of distribution transforming intelligent terminal, the operating condition of distribution transformer is monitored in real time by distribution transforming intelligent terminal, three
In the case that phase load imbalance is out-of-limit, in a communication manner (wirelessly or electrically power carrier wave), optionally remote control is whole for distribution transformer terminals
The phase-change switch of end load, will hang over the separate load of heavy duty, be switched to that underloading is separate, to reach the purpose of balancing the load.
As shown in Fig. 2 distribution transformer terminals include the first CPU and be connected respectively with the first CPU acquisition module, communication module,
Background communication module and charactron, the line outlet end of acquisition module connection connection distribution transforming, communication module connection phase-change switch, backstage
Communication module is communicated to connect with Surveillance center；Distribution transformer terminals also include keystroke handling module, keystroke handling module connection first
Distribution transformer terminals can directly be carried out parameter setting, convenient maintenance and control by CPU manually.Acquisition module uses current transformer, electricity
Current transformer connects the line outlet end of the first CPU and distribution transforming respectively, and collection distribution transformer low-pressure side three-phase current calculates three-phase
Unbalance factor, while communicating the current flow for obtaining each branch road with all phase-change switches in real time.Got in three-phase load unbalance
In the case of limit, the phase-change switch of distribution transformer terminals optionally remote terminal load will hang over the separate load of heavy duty, be switched to
Underloading is separate.Phase-change switch completes commutation at the appointed time, while by new separate access information by upper delivery transformer terminals.This
When distribution transformer terminals CPU commutations control, with reference to the load condition after switching, check the three-phrase burden balance shape after load switching
State, and feedback plus correction mechanism are formed, it is finally reached the three-phrase burden balance of load side.Distribution transformer terminals embed load CPU, can be real
When flexibly selection load commutation switching, and effectively control by corresponding measure commutation frequency, it is to avoid meaningless commutation.Further
Ground, charactron can show in real time voltage, current value and currently run it is separate, and can be by way of GPRS or optical fiber and monitoring
Center to center communications is connected, and realizes real-time monitor state, it is ensured that power supply is normal.
As shown in figure 3, phase-change switch includes power module, the 2nd CPU and the electrical quantity being connected with each other respectively with the 2nd CPU
Acquisition module, communication module, split-phase switch state acquisition module and commutation handover module, power module supply electricity to the 2nd CPU, electricity
The outlet connection of tolerance acquisition module and distribution transforming, the 2nd CPU is communicated to connect by communication module and distribution transformer terminals, split-phase switch shape
State acquisition module is connected with commutation handover module.Phase-change switch reliably performs the commutation order of distribution transformer terminals, not false triggering commutation
Operation, and the commutation time is as short as possible, can make end-user experience less than the handoff procedure of commutation, while can be to greatest extent
Protect electrical equipment.Further, phase-change switch also includes LED charactrons, and LED charactrons can show voltage, load current value
And currently run it is separate, in combination with bottom button can be set relevant parameter, also can manually commutation.Under normal condition,
Phase-change switch is communicated in the form of power carrier with distribution transformer terminals, separate (A/B/C) for above sending load to be connected, and current real
When load condition.
As shown in figure 4, electrical quantity acquisition module includes voltage transformer, current transformer, low-pass filter circuit, timing
Device, signal sample circuit, A/D converter and frequency-tracking sample circuit, the input of voltage transformer summation current transformer with
The outlet connection of distribution transforming, the output end of voltage transformer summation current transformer is connected with low-pass filter circuit, low-pass filter circuit
It is connected respectively with signal sample circuit and timer, timer connects the 2nd CPU, signal sample circuit is connected with A/D converter,
A/D converter is connected with frequency-tracking sample circuit, and frequency-tracking Acquisition Circuit is connected with LED charactrons.Collection capacity includes electricity
Pressure input and electric current input two parts, include three-phase voltage (Ua, Ub, Uc), load current (If).Phase-change switch will exchange phase
Voltage Ua accesses timer after carrying out square wave shaping, completes frequency measurement using edge triggered interruption, communication channel schematic diagram is such as
Shown in figure below, using technology of frequency tracking, the change of real-time monitoring system frequency, then between the time of real-time aligned data sampling
Every, completely eliminate fundamental frequency fluctuation caused by calculation error, can guarantee that and accurately calculated in the case where fundamental frequency deviates power frequency 50Hz
Go out the fundamental component of system at that time.
As shown in figure 5, split-phase switch quantity of state passes through Phototube Coupling, then through data buffer, is input on the 2nd CPU,
The data read when input signal is high level be " 1 ", conversely, read when input signal is low level data be " 0 ".
Can in the Interruption of software read switch amount input state, by the delay debounce of appropriate time, confirmation signal state is steady
It is fixed.
As shown in fig. 6, after phase-change switch receives commutation instruction, its control circuit being internally integrated first opens conducting phase
Electrical power switching element, when current over-zero realize shut-off, then trigger target phase electrical power switching element, and voltage reach
Turned on during zero-bit.This mode of operation can reduce division process to circuit element with transient effect of the inhibitory action in system
Impact.The analog quantity of electrical quantity acquisition module collection and the digital quantity of split-phase switch state acquisition module collection eventually pass through number
Enter the 2nd CPU according to buffer and carry out data interaction calculating, so as to send corresponding commutation instruction and pass through electric power with distribution transformer terminals
Carrier wave is communicatively coupled.
As shown in fig. 7, when distribution low-voltage side three-phase current unbalance is more prescribed a time limit, distribution transformer terminals by commutation strategy, it is determined that
This phase-change switch is carried out after commutation operation, commutation order is issued to this phase-change switch in carrier communication form.Phase-change switch is first
Power-on self-test can be first carried out, in self-inspection adjustment sampling interval by the measurement of laggard line frequency and in real time, calculating simulation amount is replicated and phase
Value, the communication task to distribution transformer terminals handled and on send real time data receive control command, if necessary to progress commutation
Judge current zero-crossing point, disconnect current mutually switch, determine whether target phase zero crossing, close target and mutually switch.Pass through communication
Switching result is sent in module, reading key-press status can be pressed and indicate to refresh progress operation self-inspection by LED charactrons, repeated
Commutation works.
As shown in figs. 1-7, distribution transforming three-phase imbalance governing system is using distribution transformer terminals collection distribution transformer low-pressure side three
Phase current calculates three-phase imbalance rate, while communicating the current flow for obtaining each branch road with all phase-change switches in real time.Three
Phase load it is uneven it is out-of-limit in the case of, the phase-change switch of distribution transformer terminals optionally remote terminal load will hang over heavily loaded phase
Other load, is switched to underloading separate.Phase-change switch completes commutation at the appointed time, while will by new separate access information
Upper delivery transformer terminals.Now the commutation control strategy module of distribution transformer terminals, with reference to the load condition after switching, checks load switching
Three-phrase burden balance state afterwards, and feedback plus correction mechanism are formed, it is finally reached the three-phrase burden balance of load side.Distribution transforming intelligence
Energy terminal embeds load Analysis policy module, can flexibly select load commutation to switch in real time, and effectively controlled by corresponding measure
Commutation frequency, it is to avoid meaningless commutation.Software systems introduce load importance to end loads simultaneously and are classified, to important load or
Have the load of particular/special requirement, can not commutation or as far as possible avoid commutation.
So that a 10kV post appears on the stage area's change distribution transforming system as an example, this area, which becomes, more than 20 terminal user.In distribution box peace
A set of distribution transformer terminals are filled, it can monitor the situation of change of distribution low-voltage outlet three-phase current load in real time.It is whole in several users
End introduces threephase cable, and accesses phase-change switch, and user's power supply is introduced by threephase switch, and three-phase electricity can be used in such user terminal
In any one phase in source, specifically used three-phase which can by commutation switching switch be controlled in real time.At a time,
This area becomes shown in the load meter 1 of distribution transforming system, wherein the user with No. * has installed phase-change switch additional:
Table 1
As three-phase imbalance governing system is devoted oneself to work at this moment, system can become three-phase imbalance feelings according to mesh foreground partition
Condition, the load to the user equipped with phase-change switch is mutually switched over, to balance the threephase load of distribution transforming, as shown in table 2：
Table 2
The load of user 2 and user 3 have been switched to A phases by three-phase imbalance governing system from B phases, and the three of the distribution transforming system
Phase degree of unbalancedness has obvious improvement, and the user for such as installing phase-change switch additional is more, and the load control for distribution transforming system can more
Plus it is accurate.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, although ginseng
The utility model is described in detail according to previous embodiment, for those skilled in the art, it still can be with
Technical scheme described in foregoing embodiments is modified, or equivalent substitution is carried out to which part technical characteristic.It is all
Within spirit of the present utility model and principle, any modification, equivalent substitution and improvements made etc. should be included in this practicality
Within new protection domain.
Claims (7)
1. a kind of distribution transforming three-phase imbalance governing system, it is characterised in that including distribution transformer terminals and phase-change switch, the distribution transforming is whole
End is connected to the line outlet end of distribution transforming, and the phase-change switch is connected between distribution transforming and customer charge, and the distribution transformer terminals pass through
Wirelessly or electrically the mode of power carrier wave and the phase-change switch are communicated to connect, the distribution transformer terminals by way of GPRS or optical fiber with
Surveillance center communicates to connect；
The distribution transformer terminals include the first CPU and the acquisition module being connected respectively with the first CPU, communication module, backstage lead to
Module and charactron are interrogated, the line outlet end of the acquisition module connection connection distribution transforming, the communication module connects the commutation and opened
Close, the Background communication module is communicated to connect with Surveillance center；
The electrical quantity that the phase-change switch includes power module, the 2nd CPU and is connected with each other respectively with the 2nd CPU gathers mould
Block, communication module, split-phase switch state acquisition module and commutation handover module, the power module supply electricity to the 2nd CPU,
The outlet connection of the electrical quantity acquisition module and distribution transforming, the 2nd CPU passes through the communication module and the distribution transformer terminals
Communication connection, the split-phase switch state acquisition module is connected with the commutation handover module.
2. distribution transforming three-phase imbalance governing system according to claim 1, it is characterised in that the distribution transformer terminals also include
Keystroke handling module, the keystroke handling module connects the first CPU.
3. distribution transforming three-phase imbalance governing system according to claim 1, it is characterised in that the acquisition module is using electricity
Current transformer, the current transformer connects the line outlet end of the first CPU and distribution transforming respectively.
4. distribution transforming three-phase imbalance governing system according to claim 1, it is characterised in that the phase-change switch also includes
LED charactrons, the LED charactrons are connected with the electrical quantity acquisition module.
5. distribution transforming three-phase imbalance governing system according to claim 1, it is characterised in that the power module is using friendship
DC inversion packaging power.
6. distribution transforming three-phase imbalance governing system according to claim 4, it is characterised in that the electrical quantity acquisition module
Including voltage transformer, current transformer, low-pass filter circuit, timer, signal sample circuit, A/D converter and frequency with
Track sample circuit, the outlet connection of the input and distribution transforming of the voltage transformer and the current transformer, the voltage is mutual
The output end of sensor and the current transformer is connected with the low-pass filter circuit, the low-pass filter circuit respectively with it is described
Signal sample circuit and timer connection, the timer connect the 2nd CPU, the signal sample circuit with it is described
A/D converter is connected, and the A/D converter is connected with the frequency-tracking sample circuit, the frequency-tracking Acquisition Circuit and
The LED charactrons connection.
7. distribution transforming three-phase imbalance governing system according to claim 1, it is characterised in that the split-phase switch state is adopted
Collection module includes the photoisolator and data buffer being sequentially connected, and the photoisolator connects the commutation switching mould
Block, the data buffer connects the 2nd CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621280250.6U CN206471834U (en) | 2016-11-25 | 2016-11-25 | Distribution transforming three-phase imbalance governing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621280250.6U CN206471834U (en) | 2016-11-25 | 2016-11-25 | Distribution transforming three-phase imbalance governing system |
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| Publication Number | Publication Date |
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| CN206471834U true CN206471834U (en) | 2017-09-05 |
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| CN201621280250.6U Active CN206471834U (en) | 2016-11-25 | 2016-11-25 | Distribution transforming three-phase imbalance governing system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169600A (en) * | 2017-12-31 | 2018-06-15 | 烟台市博宇海诺知识产权代理有限公司 | A kind of threephase load amplification monitoring reponse system |
| CN109066731A (en) * | 2018-07-26 | 2018-12-21 | 广东电网有限责任公司佛山供电局 | Distribution net platform region three-phase load unbalance self-checking device |
| CN110957748A (en) * | 2019-12-17 | 2020-04-03 | 中国农业大学 | Three-phase voltage unbalance adjusting device and method |
| CN111880017A (en) * | 2020-07-02 | 2020-11-03 | 国网天津市电力公司 | Three-phase unbalance management test system and test method for power distribution area |
| CN114123254A (en) * | 2021-11-23 | 2022-03-01 | 广东电网有限责任公司 | Multifunctional low-voltage three-phase comprehensive adjusting device |
-
2016
- 2016-11-25 CN CN201621280250.6U patent/CN206471834U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169600A (en) * | 2017-12-31 | 2018-06-15 | 烟台市博宇海诺知识产权代理有限公司 | A kind of threephase load amplification monitoring reponse system |
| CN109066731A (en) * | 2018-07-26 | 2018-12-21 | 广东电网有限责任公司佛山供电局 | Distribution net platform region three-phase load unbalance self-checking device |
| CN110957748A (en) * | 2019-12-17 | 2020-04-03 | 中国农业大学 | Three-phase voltage unbalance adjusting device and method |
| CN111880017A (en) * | 2020-07-02 | 2020-11-03 | 国网天津市电力公司 | Three-phase unbalance management test system and test method for power distribution area |
| CN114123254A (en) * | 2021-11-23 | 2022-03-01 | 广东电网有限责任公司 | Multifunctional low-voltage three-phase comprehensive adjusting device |
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| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Hainan Inventor after: Feng Pinghui Inventor after: Wu Gangyong Inventor after: Qian Weiliang Inventor before: Zhang Hainan |