CN107769232A - The bascule of public taiwan area three-phase load based on live electric current and its application - Google Patents
The bascule of public taiwan area three-phase load based on live electric current and its application Download PDFInfo
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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 belongs to management of power use technical applications, are related to the adjustment of three-phase load, more particularly to a kind of bascule of public taiwan area three-phase load based on live electric current and its application.Including the detecting circuit for being installed on the current transformer of electricity box T contact three-phase main line load sides and being electrically connected with and set gradually with Current Transformer Secondary side, amplification, rectification and filtering circuit, subtraction circuit, output control mechanism and outputting circuit for relay, compared with prior art, the advantages and positive effects of the present invention are, the present invention is by providing a kind of bascule of the public taiwan area three-phase load based on live electric current, utilize the detection of electric current, contrast, and then realize the switching of three-phase electricity, solve the power supply quality caused by existing imbalance of three-phase voltage to decline, simultaneously, application before cooperation, reach and thoroughly solve the problems, such as power supply quality decline.
Description
Technical field
The invention belongs to management of power use technical applications, are related to the adjustment of three-phase load, more particularly to a kind of based on existing
The bascule of the public taiwan area three-phase load of field current and its application.
Background technology
Public low-voltage distribution system is usually to provide power supply by separate unit distribution transformer for multiple users.Such low pressure
Electric power system has that single user load is small, and real-time change is big, and number of users is more, has a very wide distribution, and the distribution of three-phase load is more difficult
Control.Cause circuit and for its power supply Three-Phase Transformer current imbalance, and this imbalance be it is random and real-time,
More difficult manual control.Transformer caused by three-phase load unbalance meeting and low-voltage circuit loss increase；Equipment life reduces safety
Hidden danger increase；Imbalance of three-phase voltage power supply quality declines.Especially thus caused residential customers terminal voltage Quality Down, it is
The major reason of customer complaint is caused, significant negative impact is caused to power consumption good service.To solve this problem, at present
Most of power supply unit is using the method for manually adjusting ammeter box power supply phase sequence, but due to the characteristic that customer charge changes at random,
Ammeter box need to be adjusted in real time, occupy the extensive work amount of power supply employee, effect is also undesirable.
At present, the existing adjustment for three-phase load mainly has two kinds of technical schemes, and one kind is detected in transformer outlet
Current signal, multiple spot load adjustment.Its principle is that the ammeter box of correlation number is determined according to the three-phase current of transformer outlet
Delivery phase sequence, by special communication mode by master controller issue switching order, the table of the correlation number with executing agency
Case carries out delivery action, has reached the purpose of three-phase equilibrium.It is introduced that domestic existing unit attempts similar techniques, but practical application
There is no successful case.It is big technical difficulty to be present in this programme, and communication realizes that difficulty is big, poor reliability.It is likely to occur during adjustment
Current balance type is exported, but branch current is uneven, and certain customers' low-voltage is caused because line drop is present.
Another is transformer outlet and branch line multiple spot sensed current signal, multiple spot load adjustment.Its principle is root
According to transformer outlet and each branch line current as according to the delivery phase sequence for determining the ammeter box of correlation number behind circuit, pass through
Special communication mode issues switching order by master controller, and the electricity box of the correlation number with executing agency carry out delivery action,
To reach the purpose of three-phase equilibrium.Through looking into the new country without similar techniques.This programme technical difficulty is bigger, needs both-way communication, currently
Without ripe inexpensive mechanics of communication.
In order to solve the above-mentioned technical problem, applicant provided a kind of taiwan area three-phase in 2016 to State Intellectual Property Office
The method and its device (application number of load and user's terminal voltage balanced adjustment：201610736405.0), above-mentioned technical proposal
Although effectively solves the technical problem of taiwan area three-phase load automatic switchover, in order to further be carried to said apparatus and method
Go out optimisation technique scheme, therefore propose the technical program.
The content of the invention
The present invention provides a kind of technical scheme more optimized for above-mentioned technical scheme.
In order to achieve the above object, the technical solution adopted by the present invention is, the present invention provides a kind of based on live electric current
The bascule of public taiwan area three-phase load, including be installed on electricity box T contact three-phase main line load sides current transformer and
It is the detecting circuit that is electrically connected with and sets gradually with Current Transformer Secondary side, amplification, rectification and filtering circuit, subtraction circuit, defeated
Extending control mechanism and outputting circuit for relay, wherein, the detecting circuit is used for the inspection of the three-phase of current transformer output
Survey signal code of the secondary output of current signal for 0-2mA；The amplification, rectification and filtering circuit is used for 0-2mA signal code
0-5V voltage signal is produced after amplification, rectification, filtering；It is 5- that the subtraction circuit, which is used for 0-5V voltage signal output,
0V voltage signal；Voltage signal contrast of the output control mechanism by contrasting three-phase determines that a unique congenial number of delivering letters makes
Load is relatively low, and voltage is higher mutually to come into operation, and the outputting circuit for relay is used for the output knot according to output control mechanism
Fruit carries out the switching between three-phase electricity.
Preferably, the output control mechanism is to be electrically connected with a/d converter with subtraction circuit and turn with three-phase AD
The microprocessor that parallel operation is electrically connected with, the microprocessor are used to contrast the voltage signal of three-phase and determine that unique one congenial delivers letters
Number make load relatively low, voltage is higher mutually to come into operation.
The bascule of public taiwan area three-phase load according to claim 2 based on live electric current, its feature exist
In the flow of the microprocessor processes comprises the following steps：
A, the data of three A/D converters are stored in corresponding registers, and three data is compared, selected
Go out the maximum phase of data, and the phase identification code is entered as to highest phase marker register；
B, and then again the data of three A/D converters are read and replace the numerical value of corresponding registers, and are being transported
The numeric weights of row phase；
C, by the numerical value after weighting compared with other two-phases, maximum phase is chosen, judges whether and mark is posted
Storage is consistent；
If d, maximum phase numerical value is consistent with sign register, if unanimously returning to b step, if inconsistent, enter
Enter time delay subroutine, the time delay subroutine be after processor of single chip computer is delayed 5 minutes again value, weighting,
If judging that maximum phase is compared with the identification code in marker register is changed into consistent, return
B step is returned, it is again relative to marker register assignment, the non-highest of processor of single chip computer if inconsistent
The output interface answered is set to 0, and the corresponding output interface of highest puts 1；
E, after the corresponding output interface of highest puts 1, then into weighting function and run one hour after,
B step is reentered, the weighting function is secondary weighted to mutually being carried out in operation.
Preferably, in the b step, weighted value 3A.
Preferably, in the step e, secondary weighted value is 20~30A.
Preferably, the output control mechanism includes the sluggish letter of output feedback being electrically connected with successively with subtraction circuit
Number supercircuit, comparator circuit, delay circuit and output three-phase latching circuit, wherein, sluggish Signal averaging is fed back in output
Output signal feedback is additionally provided between circuit and relay circuit and initially delivers preferential lock-in circuit, wherein, the output
Feed back input signal and output signal feedback that sluggish superimposed signal circuit exported subtraction circuit and it is initial deliver it is preferential
The feedback signal that lock-in circuit is exported carries out add operation and draws three-phase voltage signal and be delivered to comparator circuit；The ratio
It is used to export compared with device circuit and feeds back the three-phase voltage signal that sluggish superimposed signal circuit inputted and be compared and by unique one
Item voltage highest is mutually electric current minterm output high level；The high level signal that the delay circuit is exported comparator circuit
Delay 1~2 minute；The output three-phase latching circuit is used to coordinate delay circuit to enter line delay switching and prevent from exporting two simultaneously
Phase high level causes short circuit.
Present invention also offers the application process of the bascule of the above-mentioned public taiwan area three-phase load based on live electric current,
The bascule of the public taiwan area three-phase load based on live electric current is used to be arranged on main line and branch line front end.
Compared with prior art, the advantages and positive effects of the present invention are,
1st, the present invention utilizes electric current by providing a kind of bascule of the public taiwan area three-phase load based on live electric current
Detection, contrast, and then realize the switching of three-phase electricity, solve under the power supply quality caused by existing imbalance of three-phase voltage
Drop, meanwhile, the application before coordinating, reach and thoroughly solve the problems, such as power supply quality decline.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are some embodiments of the present invention, for ability
For the those of ordinary skill of domain, without having to pay creative labor, it can also be obtained according to these accompanying drawings other
Accompanying drawing.
Fig. 1 is the circuit total figure of the bascule for the public taiwan area three-phase load based on live electric current that embodiment provides；
The installation diagram of the bascule for the public taiwan area three-phase load based on live electric current that Fig. 2 positions embodiment provides；
The circuit diagram of the bascule for the public taiwan area three-phase load based on live electric current that Fig. 3 positions embodiment 1 provides；
Fig. 4 is the microprocessor control principle drawing that embodiment provides；
Fig. 5 is the flow chart for the microprocessor control that embodiment 1 provides；
The relay end of the bascule for the public taiwan area three-phase load based on live electric current that Fig. 6 positions embodiment 1 provides
Circuit diagram
Fig. 7 is the signal control of the bascule for the public taiwan area three-phase load based on live electric current that embodiment 1 provides
The circuit diagram at end；
Fig. 8 is the relay end of the bascule for the public taiwan area three-phase load based on live electric current that embodiment 2 provides
Circuit diagram；
Fig. 9 is the public distribution network topological diagram of existing low pressure that embodiment 3 provides；
Figure 10 is the embodiment 1 that embodiment 3 provides or embodiment 2 coordinates taiwan area three-phase load and user's terminal voltage balance
The public distribution network topological diagram of low pressure that adjusting apparatus uses.
Embodiment
In order to be more clearly understood that the above objects, features and advantages of the present invention, with reference to the accompanying drawings and examples
The present invention will be further described.It should be noted that in the case where not conflicting, in embodiments herein and embodiment
Feature can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented using other modes described here are different from, therefore, the present invention is not limited to the specific of specification described below
The limitation of embodiment.
As shown in Figure 1 and Figure 2, principle of the invention is：The present apparatus by open-close type current transformer by being installed on electricity box T
Contact main line load side, measured value do not include present apparatus electric current.After putting into operation, the three-phase electricity flow valuve of detection is passed through electricity by the present apparatus
Stream sample circuit becomes voltage signal, and by comparing, selecting a unique voltage highest, mutually i.e. electric current minterm is output high electricity
Flat and then control relay is connected, and is realized the switching between triple line, is reached balanced load, improves the purpose of power quality.
Embodiment 1, as shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, the present embodiment provide it is a kind of using microprocessor based on scene
The bascule of the public taiwan area three-phase load of electric current.
The present embodiment provides the bascule of the public taiwan area three-phase load based on live electric current, including is installed on electricity box
The current transformer of T contact three-phase main line load sides and the detection for being electrically connected with and setting gradually with Current Transformer Secondary side
Circuit, amplification, rectification and filtering circuit, subtraction circuit and output control mechanism, wherein, current transformer is open-close type current
Transformer, it is each in each phase line to set one, each current transformer with detecting circuit, amplification, rectification and filtering circuit, subtract
Adder circuit, three subtraction circuits finally with an output control mechanism connection, in the present embodiment, detecting circuit by
D101-301 diodes and R101 compositions, the signal code by the 0-5A electric currents output of Current Transformer Secondary side for 0-2mA；
The in-phase amplifier of IC1-1, IC2-1, IC3-1 and resistance R102-302, R103-303, IC101-301 composition is by 0-2mA letter
0-5V voltage signal is produced after number Current amplifier, rectification, filtering；IC1-2 IC2-2 IC3-2 and peripheral R105-108/
R205-208/R305-308 forms subtraction circuit, and subtraction circuit and reference voltage (5V) carry out subtraction, obtain 0-5V
Signal voltage export again to output control mechanism.
In the present embodiment, output control mechanism is to be electrically connected with a/d converter with subtraction circuit and turn with three-phase AD
The microprocessor that parallel operation is electrically connected with, the main purpose of a/d converter is that voltage signal is converted into data signal, and then conveniently
Microprocessor, contrasted, realize switching, in the present embodiment, microprocessor selects AT89C51 chips, it is of course also possible to select
With other microprocessors, the application based on present principles, all should be in protection scope of the present invention.
AT89C51 chips are 8 8051 core chips, include 9 EPROM, and internal storage space 4K, internal ROM are
512B, frequency 40MHz outside highest.Present processor contains 4 I/O interfaces, and P1 passes through photoelectrical coupler as output interface, output interface
Isolation, to strengthen antijamming capability.P0, P1 mouth are as data acquisition interface.Its software systems is shown in logic chart.Start operation is initial
Change program, the data of three A/D converters are stored in corresponding registers successively, microprocessor is compared to three data, is selected
Go out the big phase of group, and this identification code is entered as to highest phase marker register, interface corresponding to P1 is put 1.Program enters
Next step circulation pattern, read the data of three A/D converters again first and replace the numerical value of corresponding registers, in operation phase
Numeric weights, numerical value is adjustable, is typically set to 3A, prevents equipment frequent switching, and the numerical value after weighting and other two-phases are carried out
Compare, choose maximum phase, judge whether consistent with marker register, if consistent return, if inconsistent, operation is delayed sub- journey
Sequence, delay 5 minutes after again value, weighting, judge maximum phase, if being compared and being changed into the identification code in marker register
Unanimously, then return, marker register assignment, P1 are set to 0 again if inconsistent, the corresponding P1 mouths of highest put 1, and operation one is small
When weighting function, to mutually carrying out secondary weighted in operation, be traditionally arranged to be 20-30A, in order to be maintained at as far as possible
The stabilization of phase is run, avoids frequent switching.Program backs into circulatory monitoring.This programming is considered to adding in operation phase
Power, to avoid, because of short duration or interval big load causes the frequent switching of equipment, with the service life of extension device, keeping away
The harmonic wave exempted from handoff procedure occurs.
In order to realize the switching of circuit, the present embodiment additionally provides relay circuit, relay circuit by photoelectrical coupler,
Anti- short circuit current, relay and independent 12 volts of power supplys composition.The effect of wherein photoelectrical coupler is to make electrical communication part and list
Piece machine processor carries out complete electrical isolation, avoids interference of the more severe electromagnetic environment to processor of single chip computer.It is anti-
Short-circuit protection circuit sampling end carries out rectification by C1-C6 connection output relay nodes or the contact of output end two of IGCT
Filtering, when relay closure or turn on thyristors, voltage is 0-1V therebetween.It is insufficient to allow two photoelectrical couplers of the phase to lead
It is logical.So as to limit the conduction of the control signal of other phases, play a part of ensureing that the same time can only have one to be conducted, avoid short circuit
Failure, solid-state relay are less than or equal to 10 milliamperes using low current triggering property, trigger voltage 3-36V, trigger current.Ensure reliable
Triggering.
Embodiment 2, the present embodiment provide it is a kind of using in contrast with electric component group circuit based on the public of live electric current
The bascule of taiwan area three-phase load
As shown in Figure 7, Figure 8, compared with Example 1, the present embodiment substitutes microprocessor to the present embodiment by setting circuit
The structure of device, to reach the purpose of contrast, using the technical program compared to embodiment 1, cost is relatively low and need not install AD and turns
Parallel operation carries out signal conversion.
The output feedback that the output control mechanism that the present embodiment is provided includes being electrically connected with successively with subtraction circuit is slow
Hysteresis signal supercircuit, comparator circuit, delay circuit and output three-phase latching circuit, wherein, sluggish signal is fed back in output
Output signal feedback is additionally provided between supercircuit and relay circuit and initially delivers preferential lock-in circuit, wherein, it is described
The input signal and output signal feedback and initially deliver that the sluggish superimposed signal circuit of output feedback is exported subtraction circuit
The feedback signal that preferential lock-in circuit is exported carries out add operation and draws three-phase voltage signal and be delivered to comparator circuit；Institute
State comparator circuit and be used to export and feed back the three-phase voltage signal that sluggish superimposed signal circuit inputted and be compared and will only
Item voltage highest is mutually electric current minterm output high level one by one；The high level that the delay circuit is exported comparator circuit
Signal is delayed 1~2 minute；The output three-phase latching circuit is used to coordinating delay circuit to enter line delay switching and prevent while defeated
Go out two-phase high level and cause short circuit.
Above circuit structure is existing common circuit, in the present embodiment, is simply effectively combined, and is come
Reach the purpose of the present invention, meanwhile, detailed circuit structure is given in the accompanying drawings, therefore herein not to its detailed statement.
Embodiment 3, the present embodiment provide the concrete application of above-described embodiment 1 or embodiment 2 in the public power distribution network of low pressure
As shown in Figure 9, Figure 10, above-described embodiment 1 or embodiment 2 are installed on main line and branch line front end, so, can be automatic
Select electric current is minimum mutually to put into, filled in the end of main line and branch line from taiwan area three-phase load and user's terminal voltage balanced adjustment
Put, voltage highest can be selected mutually to put into, the purpose so set is mainly that circuit leading portion electric current is larger, uses current mode phase selection
Device, most of load can be balanced, terminal voltage differs greatly, and selects voltage detecting type phase selector further to balance three-phase and bears
Lotus, and terminal temperature difference quality of voltage can be ensured.
By above-mentioned setting, and then the problem of be fully solved three-phase load unbalance.
The above described is only a preferred embodiment of the present invention, being not the limitation for making other forms to the present invention, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Effect embodiment is applied to other fields, but every without departing from technical solution of the present invention content, the technical spirit according to the present invention
Any simple modification, equivalent variations and the remodeling made to above example, still fall within the protection domain of technical solution of the present invention.
Claims (7)
1. a kind of bascule of the public taiwan area three-phase load based on live electric current, it is characterised in that including being installed on electricity box T
The current transformer of contact three-phase main line load side and the detection for being electrically connected with and setting gradually with Current Transformer Secondary side
Circuit, amplification, rectification and filtering circuit, subtraction circuit, output control mechanism and outputting circuit for relay, wherein, the detection
Circuit is used for the signal code for 0-2mA by the secondary output of the sensed current signal of the three-phase of current transformer output；It is described to put
Big current rectifying and wave filtering circuit is used to that 0-5V voltage signal will to be produced after 0-2mA signal code amplification, rectification, filtering；It is described to subtract
Adder circuit is used for the voltage signal for 5-0V by 0-5V voltage signal output；The output control mechanism is by contrasting three-phase
Voltage signal contrast determine that a unique congenial number of delivering letters makes load relatively low, voltage is higher mutually to come into operation, the relay
Output circuit is used to carry out the switching between three-phase electricity according to the output result of output control mechanism.
2. the bascule of the public taiwan area three-phase load according to claim 1 based on live electric current, it is characterised in that
The output control mechanism is to be electrically connected with a/d converter with subtraction circuit and be electrically connected with three-phase a/d converter micro-
Processor, the microprocessor are used to contrast the voltage signal of three-phase and determine that the unique one congenial number of delivering letters makes load relatively low, electricity
Pressure is higher mutually to come into operation.
3. the bascule of the public taiwan area three-phase load according to claim 2 based on live electric current, it is characterised in that
The flow of the microprocessor processes comprises the following steps：
A, the data of three A/D converters are stored in corresponding registers, and three data is compared, select data maximum
One phase, and it is entered as the phase identification code to highest phase marker register；
B, and then again the data of three A/D converters are read and replace the numerical value of corresponding registers, and to the numerical value in operation phase
Weighting；
C, by the numerical value after weighting compared with other two-phases, maximum phase is chosen, is judged whether consistent with marker register；
If d, maximum phase numerical value is consistent with sign register, if unanimously returning to b step, if inconsistent, into time delay subroutine,
The time delay subroutine be processor of single chip computer be delayed 5 minutes after again value, weighting, judge maximum phase and identification register
If the identification code in device, which is compared, is changed into consistent, b step is returned, it is single again to marker register assignment if inconsistent
The corresponding output interface of the non-highest of piece machine processor is set to 0, and the corresponding output interface of highest puts 1；
E, after the corresponding output interface of highest puts 1, then into weighting function and run one hour after, reenter b step
Suddenly, the weighting function is secondary weighted to mutually being carried out in operation.
4. the bascule of the public taiwan area three-phase load according to claim 3 based on live electric current, it is characterised in that
In the b step, weighted value 3A.
5. the bascule of the public taiwan area three-phase load according to claim 4 based on live electric current, it is characterised in that
In the step e, secondary weighted value is 20~30A.
6. the bascule of the public taiwan area three-phase load according to claim 1 based on live electric current, it is characterised in that
The output control mechanism includes feeding back sluggish superimposed signal circuit, comparator with the output that subtraction circuit is electrically connected with successively
Circuit, delay circuit and output three-phase latching circuit, wherein, output feed back sluggish superimposed signal circuit and relay circuit it
Between be additionally provided with output signal feedback and initially deliver preferential lock-in circuit, wherein, sluggish Signal averaging electricity is fed back in the output
Input signal and output signal that road is exported subtraction circuit feedback and initially deliver preferential lock-in circuit exported it is anti-
Feedback signal carries out add operation and draws three-phase voltage signal and be delivered to comparator circuit；The comparator circuit is used for will output
The three-phase voltage signal that sluggish superimposed signal circuit is inputted is fed back to be compared and by a unique voltage highest mutually i.e. electric current
Minterm exports high level；The high level signal that the delay circuit is exported comparator circuit is delayed 1~2 minute；It is described
Output three-phase latching circuit is used to coordinate delay circuit to enter line delay switching and prevent that exporting two-phase high level simultaneously causes short circuit.
7. the bascule of the public taiwan area three-phase load based on live electric current described in any one of the claims 1~6
Application process, it is characterised in that the bascule of the public taiwan area three-phase load based on live electric current is used to be arranged on master
Line and branch line front end.
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| CN201711281002.2A CN107769232A (en) | 2017-12-07 | 2017-12-07 | The bascule of public taiwan area three-phase load based on live electric current and its application |
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| CN201711281002.2A CN107769232A (en) | 2017-12-07 | 2017-12-07 | The bascule of public taiwan area three-phase load based on live electric current and its application |
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