CN206712473U - A kind of three-phase imbalance automatic straightening system - Google Patents

A kind of three-phase imbalance automatic straightening system Download PDF

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Publication number
CN206712473U
CN206712473U CN201720540916.5U CN201720540916U CN206712473U CN 206712473 U CN206712473 U CN 206712473U CN 201720540916 U CN201720540916 U CN 201720540916U CN 206712473 U CN206712473 U CN 206712473U
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zero
resistance
current
voltage
signal
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朱先鑫
王相臣
吴志宏
刘环珠
孙军伟
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ZHENGZHOU BO GEN ELECTRICAL EQUIPMENT Co Ltd
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ZHENGZHOU BO GEN ELECTRICAL EQUIPMENT Co Ltd
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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
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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Abstract

A kind of three-phase imbalance automatic straightening system, including intelligent commutation portion, three-phase imbalance remote monitoring portion and wireless transport module；Remote monitoring module includes second processing unit, electric current, voltage collection circuit and computer；The current signal collected and voltage signal are transferred to second processing unit by electric current, voltage collection circuit, and second processing unit transmits signals to first processing units by wireless transport module；Intelligent commutation portion includes commutation housing and intelligent commutation module；Intelligent commutation module includes voltage zero-crossing detection circuit, current over-zero detection circuit, magnetic latching relay driving chip, magnetic latching relay and first processing units；The voltage and current signal detected is transferred to first processing units by voltage zero-crossing detection circuit, current over-zero detection circuit respectively, and first processing units output signals to magnetic latching relay driving chip.The utility model is novel in design, contributes to continuously adjusting for three-phase equilibrium, facilitates and three-phase equilibrium situation is monitored, and it is convenient to realize.

Description

A kind of three-phase imbalance automatic straightening system
Technical field
The utility model belongs to three-phase imbalance correcting technology field, and in particular to a kind of three-phase imbalance automatic straightening system System.
Background technology
Low-voltage circuit three-phase load unbalance has the characteristics of extremely obvious：
1. with observability and the property calculated；
2. caused line loss is extraordinary big and causes to seriously endanger；
3. with existing intractable, chronicity and property distributed more widely along the line.
In order to reduce low-voltage network electric energy loss, distribution network electric energy quality is lifted, it is necessary to take effective adjustment of correlation Measure, administer or eliminate low-voltage three-phase load imbalance.
Existing three-phase imbalance controlling device is adjusted using electric capacity mostly, and treatment range and applicable situation have very Big limitation, cumbersome and expensive because of electric capacity, later stage easily failure needs often maintenance is used, Putting equipment in service cost is higher.
Utility model content
The utility model aims to provide a kind of three-phase imbalance automatic straightening system simple in construction, using effect is good.
In order to solve the above technical problems, the utility model provides following technical scheme：A kind of three-phase imbalance is automatic Correction system, including intelligent commutation portion, three-phase imbalance remote monitoring portion and wireless transport module；
Three-phase imbalance remote monitoring portion includes remote monitoring housing and is arranged at the long-range prison of remote monitoring enclosure interior Control module；Three-phase imbalance remote monitoring module includes second processing unit, electric current, voltage collection circuit and computer；Electric current, The current signal collected and voltage signal are transferred to second processing unit by voltage collection circuit, and second processing unit is by electric current Signal and voltage signal, three-phase imbalance signal are transferred to computer, and second processing unit is also transmitted by wireless transport module Three-phase imbalance signal is to first processing units；
Intelligent commutation portion includes commutation housing and is arranged at the intelligent commutation module of commutation enclosure interior；Intelligent commutation module Including voltage zero-crossing detection circuit, current over-zero detection circuit, magnetic latching relay driving chip, magnetic latching relay and first Processing unit；Voltage zero-crossing detection circuit, current over-zero detection circuit gather the voltage and current signal of circuit to be detected respectively, Voltage zero-crossing detection circuit, current over-zero detection circuit respectively transmit the voltage zero-crossing signal detected and current zero-crossing signal To first processing units, first processing units output signals to magnetic latching relay driving chip, magnetic latching relay driving core Piece outputs signals to magnetic latching relay, and control magnetic latching relay realizes commutation.
Electric current, voltage collection circuit include the computation chip being connected with the signal input part of second processing unit, metering core Current sampling circuit is connected with first and second current difference signal inputs of piece；First and second voltages of computation chip Voltage sampling circuit is connected with differential signal input.
Remote monitoring module also includes 485 communication units, and second processing unit is led to by 485 communication units with computer Letter.
Remote monitoring module also includes display unit, second processing element output signal to display unit.
The signal output part of second processing unit is connected with warning circuit.
Wireless transport module includes wireless transmitting unit and radio receiving unit, wireless transmitting unit and second processing unit Signal output part connection, radio receiving unit connect first processing units signal input part；Wireless transmitting unit is by signal It is wirelessly transmitted to radio receiving unit.
Voltage zero-crossing detection circuit includes detection optocoupler, diode, first voltage and crosses zero resistance, second voltage zero passage electricity Resistance, tertiary voltage cross zero resistance and the 4th voltage zero-cross resistance；
First voltage crosses zero resistance, second voltage zero passage resistor coupled in parallel connection the first current-limiting circuit of composition；Tertiary voltage mistake The second current-limiting circuit is formed after zero resistance and the 4th voltage zero-cross resistor coupled in parallel, first current-limiting circuit one end connects electricity to be detected Road, the first input end of other end connecting detection optocoupler；Second current-limiting circuit one end is grounded, and the of other end connecting detection optocoupler Two inputs, the first input end for detecting optocoupler are also connected with the positive pole of diode, and the second input for detecting optocoupler is also connected with two The negative pole of pole pipe；The first output head grounding of optocoupler is detected, detects the second lead-out terminal connection first processing units of optocoupler Signal input part；Second lead-out terminal of detection optocoupler also passes through voltage zero-cross capacity earth；Detect the second output end of optocoupler Son also connects power supply by the 5th voltage zero-cross resistance.
Current over-zero detection circuit includes the second current transformer, the first operational amplifier and the second operational amplifier；The The first current over-zero resistance is in series with two current transformers, the first end of the first current over-zero resistance passes through the first current over-zero Capacity earth, the second end of the first current over-zero resistance by the second current over-zero capacity earth, the first current over-zero resistance First end also connects the inverting input of the first operational amplifier by the second current over-zero resistance；First current over-zero resistance Second end is also connected with the in-phase input end of the first operational amplifier；The inverting input and in-phase input end of first operational amplifier Between be connected with the 3rd current over-zero electric capacity；The output end of the inverting input of first operational amplifier and the first operational amplifier Between be connected with the 3rd current over-zero resistance；The positive power end connection power supply of first operational amplifier, the first operational amplifier Positive power end also pass through the 4th current over-zero capacity earth；The negative sense power end ground connection of first operational amplifier；First fortune The output end for calculating amplifier passes sequentially through the 4th current over-zero resistance and the 5th current over-zero resistance the second operational amplifier of connection Inverting input；4th current over-zero resistance also passes through the 5th current over-zero capacity earth；The same phase of second operational amplifier Input connects power supply by the 6th current over-zero resistance；The output end of second operational amplifier passes through the 7th current over-zero resistance Connect power supply；Also the signal of the 8th current over-zero resistance connection second processing unit is defeated successively for the output end of second operational amplifier Enter end, the signal input part of second processing unit also passes through the 6th current over-zero capacity earth.
Current sampling circuit includes the first current transformer, and the of the first end connection first resistor of the first current transformer One end and the first end of 3rd resistor；Second end of first resistor connects the second of the first current transformer by second resistance End；First current difference signal input of the second end connection computation chip of 3rd resistor；It is also associated with simultaneously in 3rd resistor Join the 5th resistance and the first electric capacity of connection；The 5th resistance being connected in parallel and the first electric capacity are also associated with the 6th be connected in parallel Resistance and the second electric capacity；The 6th resistance being connected in parallel and the second electric capacity are also connected with the second current difference signal input；First Second end of current transformer also connects the second current difference signal input by the 4th resistance；
Voltage sampling circuit includes the 7th resistance and the 8th resistance, and the 7th resistance connects circuit to be detected, and the 8th resistance connects Connecting to neutral line；7th resistance connects the first voltage signal input part of computation chip, the second electricity of the 8th resistance connection computation chip Press signal input part；The 3rd electric capacity and the 4th electric capacity being connected in series, the 7th electricity are connected between 7th resistance and the 8th resistance The 9th resistance and the tenth resistance being connected in series are also associated between resistance and the 8th resistance.
By above technical scheme, the beneficial effects of the utility model are：（1）In low-voltage circuit electricity box input by setting Adjustment distribution in real time can be carried out to the three-phase current of the electricity box inlet highway of low-voltage circuit by putting intelligent commutation mechanism, ensure that from Electricity box have all carried out the regulation of three-phase imbalance to transformer, and solving conventional capacitance adjustment mode can only to transformer or only The problem of three-phase imbalance improvement being carried out to electricity box；Meanwhile multiple intelligent commutation mechanisms are set to be carried out to three-phase current More successional regulation, it is more conducive to the realization of three-phase equilibrium；Intelligent commutation mechanism is thrown by single-chip microcomputer control relay zero passage Cut, be the more advanced switch on-off technology of industry, working stability, energy consumption is low；And the wireless transport module and long-range prison set up Control module can realize remote transmission and the monitoring of data, facilitate the monitoring to electric terminal, and it is convenient to realize.（2）At first Manage unit and the second processing unit speed of service is fast, low in energy consumption, the correction suitable for the quality of power supply controls.（3）Remote monitoring mould The display unit and alarm unit that block is set can carry out remotely showing and reminding to three-phase equilibrium situation, and staff can be with When tri-phase unbalance factor checked by display unit, learn whether tri-phase unbalance factor reaches higher limit by alarm unit.（4） The 485 communication unit signal stabilizations that remote monitoring module is set, the transmission of signal is quicker between computer.（5）By wireless Transmitter unit and radio receiving unit can realize being wirelessly transferred for signal, and it is convenient to realize.（6）The voltage zero-cross detection electricity of setting Road and current over-zero detection circuit and remote monitoring module be used cooperatively, so as to three-phase imbalance realize voltage zero-cross input and Current over-zero excision detection is accurate, easy to use.
Brief description of the drawings
Fig. 1 is the utility model principle block diagram；
Fig. 2 is electric current, voltage collection circuit schematic diagram；
Fig. 3 is voltage zero-crossing detection circuit schematic diagram；
Fig. 4 is that current over-zero detects circuit theory diagrams；
Fig. 5 is warning circuit schematic diagram；
Fig. 6 is display circuit schematic diagram.
Embodiment
A kind of three-phase imbalance automatic straightening system, as shown in figure 1, remotely being supervised including intelligent commutation portion, three-phase imbalance Control portion and wireless transport module.
Three-phase imbalance remote monitoring portion is connected to transformer outgoing line side, and it is used for the electricity of remote collection inducer for line outlet end of transformer Signal and voltage signal are flowed, and three-phase imbalance signal is exported to intelligent commutation portion, intelligent commutation portion by wireless transport module Output signal realizes commutation, and then realizes three-phase electric equilibrium.
Wireless transport module includes wireless transmitting unit（Model SZ11-01 radio frequency chip）And radio receiving unit （Model SZ11-01 radio frequency chip）, wireless transmitting unit is connected with the signal output part of second processing unit, wireless receiving Unit connects the signal input part of first processing units；The three-phase imbalance signal received is wirelessly transferred by wireless transmitting unit To radio receiving unit.
Three-phase imbalance remote monitoring portion includes remote monitoring housing and is arranged at the long-range prison of remote monitoring enclosure interior Module is controlled, remote monitoring housing uses PC materials, and degree of protection reaches IP30.
Remote monitoring module shares 3, and per 1 remote monitoring module is mutually connected on electricity, wherein remote monitoring module includes Display unit, 485 communication units, second processing unit, warning circuit, electric current, voltage collection circuit and computer.
The current signal collected and voltage signal are transferred to second processing unit by electric current, voltage collection circuit, and second Processing unit outputs signals to display unit and warning circuit.
Meanwhile second processing element output signal is believed to wireless transmitting unit, wireless transmitting unit output three-phase imbalance Number radio receiving unit is transferred to, radio receiving unit transfers signals to first processing units.
Second processing unit includes second singlechip（Model MSP430）, second singlechip passes through 485 communication units（Type Number it is VP3082）Communicated with computer, so as to which the current signal collected and voltage signal are transferred into computer.
As shown in Fig. 2 electric current, voltage collection circuit include the computation chip being connected with the signal input part of second singlechip U1（Model ATT7022）, so as to obtain electric current, the voltage of transformer outlet circuit by computation chip U1.
Computation chip U1 the first and second current difference signal inputs（V1P、V1N）On be connected with current sample electricity Road；Computation chip U1 the first and second voltage signal inputs（V2P、V2N）On be connected with voltage sampling circuit.
Current sampling circuit includes the first current transformer TA1, the first current transformer TA1 electricity of first end connection first Hinder R1 first end and 3rd resistor R3 first end；First resistor R1 the second end passes through second resistance R2 the first electric currents of connection Transformer TA1 the second end；3rd resistor R3 the second end connection computation chip U1 the first current difference signal input （V1P）；The 5th resistance R5 and the first electric capacity C1 being connected in parallel are also associated with 3rd resistor R3；The 5th resistance being connected in parallel R5 and the first electric capacity C1 is also associated with the 6th resistance R6 and the second electric capacity C2 being connected in parallel；The 6th resistance R6 that is connected in parallel and Second electric capacity C2 connection the second current difference signal inputs（V1N）；Second end of the first current transformer is also by the 4th electricity Hinder R4 connection the second current difference signal inputs（V1N）.
Current signal is coupled in first resistor and second resistance by the first current transformer TA1, and current signal passes through 3rd resistor and the 4th resistive transmission are to computation chip, so that computation chip draws the current signal of detection circuit.
Voltage sampling circuit includes the 7th resistance R7 and the 8th resistance R8, and the 7th resistance connects circuit L to be detected, the 8th electricity Resistance connection zero line N.7th resistance R7 connection computation chips U1 first voltage signal input part（V2P）, the 8th resistance R8 connections Computation chip U1 second voltage signal input part（V2N）；It is connected with and is connected in series between 7th resistance R7 and the 8th resistance R8 The 3rd electric capacity C3 and the 4th electric capacity C4, the 9th resistance being connected in series is also associated between the 7th resistance R7 and the 8th resistance R8 R9 and the tenth resistance R10.
Voltage signal is transferred to computation chip, so that computation chip by the current limliting of the 7th resistance and the 8th resistance Draw the voltage signal of detection circuit.
As shown in fig. 6, display unit includes display screen U5（LCD）With display exclusion RP, the display signal output of single-chip microcomputer End connection shows exclusion, display exclusion connection display screen, so as to single-chip microcomputer output signal signal, shows screen display signal.
Can be with real-time display per the mutually current signal and voltage signal on electricity by display unit.
As shown in figure 5, warning circuit includes triode Q, light emitting diode D2, buzzer FM and alarm resistance R19, three poles The signal output part of pipe Q base stage connection second singlechip, triode Q colelctor electrode connect buzzer FM one end and hair respectively Optical diode D2 negative pole, buzzer FM other end connection power supply, light emitting diode D2 positive pole are connected by the resistance R19 that alarms Connect power supply.When voltage signal and current signal exceed threshold value, second singlechip output high level signal causes triode ON, And then make light emitting diode and buzzer and power on, and then lumination of light emitting diode, buzzer beep, to work Reminded as personnel.
Intelligent commutation portion is connected to user load side, its at least one, an intelligent commutation portion is connected on each phase electricity.
Each intelligent commutation portion includes commutation housing and is arranged at the intelligent commutation module of commutation enclosure interior, commutation shell Body will reach IP30 degree of protection, the specific stainless steel of material selection 304.
Intelligent commutation module includes voltage zero-crossing detection circuit, current over-zero detection circuit, magnetic latching relay driving core Piece, magnetic latching relay and first processing units.
Voltage zero-crossing detection circuit, current over-zero detection circuit gather the voltage and current signal of circuit to be detected respectively, The voltage and current signal detected is transferred to first processing units by voltage zero-crossing detection circuit, current over-zero detection circuit, First processing units output signals to magnetic latching relay driving chip（Model RY8023T）, magnetic latching relay driving core Piece outputs signals to magnetic latching relay driving chip, and magnetic latching relay drive chip signal output arrives magnetic latching relay It is switched on or switched off.
First processing units include the first single-chip microcomputer（Model C8051F30）.
As shown in figure 3, voltage zero-crossing detection circuit, which includes detection optocoupler U4, diode D1, first voltage, crosses zero resistance R21, second voltage cross zero resistance R22, tertiary voltage crosses zero resistance R23 and the 4th voltage zero-cross resistance R24；
First voltage crosses zero resistance R21, second voltage crosses zero resistance R22 and is connected in parallel the first current-limiting circuit of composition；3rd The second current-limiting circuit is formed after voltage zero-cross resistance R23 and the 4th voltage zero-cross resistance R24 parallel connections, first current-limiting circuit one end connects Reception detection circuit, other end connecting detection optocoupler U4 first input end；Second current-limiting circuit one end is grounded, other end connection Optocoupler U4 the second input is detected, detection optocoupler U4 first input end is also connected with diode D1 positive pole, detection optocoupler U4 The second input be also connected with diode D1 negative pole；Optocoupler U4 the first output head grounding is detected, detects the second of optocoupler U4 Lead-out terminal connects the signal input part of the first single-chip microcomputer；Detection optocoupler U4 the second lead-out terminal also passes through voltage zero-cross electric capacity C11 is grounded；Detection optocoupler U4 the second lead-out terminal also passes through the 5th voltage zero-cross resistance R25 connection power supplys.
Voltage signal enters detection optocoupler, detection light after the current limliting of the first current-limiting circuit and the second current-limiting circuit Coupling is when voltage signal is zero, output high level to the first single-chip microcomputer, so as to which the first single-chip microcomputer can draw voltage zero-crossing signal.
As shown in figure 4, current over-zero detection circuit includes the second current transformer TA2, the first operational amplifier and second Operational amplifier.
The of the first current over-zero resistance R11, the first current over-zero resistance R11 is in series with second current transformer TA2 It is grounded on one end by the first current over-zero electric capacity C5, passes through the second electric current mistake on the first current over-zero resistance R11 the second end Zero capacitance C6 is grounded, and the first current over-zero resistance R11 first end also passes through second current over-zero resistance R12 the first computings of connection Amplifier U2 inverting input；First current over-zero resistance R11 the second end is also connected with the first operational amplifier U2 same phase Input；The 3rd current over-zero electric capacity C7 is connected between first operational amplifier U2 inverting input and in-phase input end； The 3rd current over-zero is connected between first operational amplifier U2 inverting input and the first operational amplifier U2 output end Resistance R13；First operational amplifier U2 positive power end connection power supply, the first operational amplifier U2 positive power end are also logical Cross the 4th current over-zero electric capacity C8 ground connection；First operational amplifier U2 negative sense power end ground connection；First operational amplifier U2's Output end passes sequentially through the 4th current over-zero resistance R14's and the 5th current over-zero resistance R15 the second operational amplifiers of connection U3 Inverting input；4th current over-zero resistance R14 is also grounded by the 5th current over-zero electric capacity C9；Second operational amplifier U3's The reference power supply that in-phase input end passes through the 6th current over-zero resistance R16 connections 3.5V；Second operational amplifier U3 output end Pass through the 7th current over-zero resistance R17 connection power supplys；Also the 8th current over-zero is electric successively for second operational amplifier U3 output end The signal input part of R18 connection second singlechips is hindered, the signal input part of second singlechip also passes through the 6th current over-zero electric capacity C10 is grounded.
Current signal in circuit by the coupled transfer of the second current transformer on the first current over-zero resistance, then Current signal enters second singlechip by the amplification of the first operational amplifier and the second operational amplifier, so as to the second monolithic Machine receives current zero-crossing signal.
When work, three-phase imbalance remote monitoring portion is according to the voltage signal and electricity of the inducer for line outlet end of transformer detected Stream signal show whether inducer for line outlet end of transformer three-phase balances, and intelligent commutation portion is output signals in three-phase electricity imbalance, intelligence Commutation portion receives signal, in voltage zero-cross, outputs signals to magnetic latching relay driving chip so that magnetic keep after Electrical equipment acts, and realizes the commutation of three-phase electricity, wherein, realize that the commutation of three-phase electricity is ripe existing skill by magnetic latching relay Art, embodiment will not be repeated here.
The utility model is novel in design, and the intelligent commutation portion of setting can carry out commutation operation to electricity consumption end, contribute to three That balances each other continuously adjusts；Meanwhile the wireless transport module and remote monitoring module of setting can realize the remote transmission of data And monitoring, facilitate and three-phase equilibrium situation is monitored, it is convenient to realize.

Claims (9)

  1. A kind of 1. three-phase imbalance automatic straightening system, it is characterised in that：Including intelligent commutation portion, three-phase imbalance remote monitoring Portion and wireless transport module；
    Three-phase imbalance remote monitoring portion includes remote monitoring housing and is arranged at the remote monitoring mould of remote monitoring enclosure interior Block；Three-phase imbalance remote monitoring module includes second processing unit, electric current, voltage collection circuit and computer；Electric current, voltage The current signal collected and voltage signal are transferred to second processing unit by Acquisition Circuit, and second processing unit is by current signal Computer is transferred to voltage signal, three-phase imbalance signal, second processing unit also transmits three-phase by wireless transport module Unbalanced signal is to first processing units；
    Intelligent commutation portion includes commutation housing and is arranged at the intelligent commutation module of commutation enclosure interior；Intelligent commutation module includes Voltage zero-crossing detection circuit, current over-zero detection circuit, magnetic latching relay driving chip, magnetic latching relay and the first processing Unit；Voltage zero-crossing detection circuit, current over-zero detection circuit gather the voltage and current signal of circuit to be detected, voltage respectively The voltage zero-crossing signal detected and current zero-crossing signal are transferred to the by zero cross detection circuit, current over-zero detection circuit respectively One processing unit, first processing units output signals to magnetic latching relay driving chip, and magnetic latching relay driving chip is defeated Go out signal and realize commutation to magnetic latching relay, control magnetic latching relay.
  2. 2. three-phase imbalance automatic straightening system as claimed in claim 1, it is characterised in that：Electric current, voltage collection circuit bag The computation chip being connected with the signal input part of second processing unit is included, the first and second current difference signals of computation chip are defeated Enter and be connected with current sampling circuit on end；Voltage is connected with first and second voltage differential signal inputs of computation chip to adopt Sample circuit.
  3. 3. three-phase imbalance automatic straightening system as claimed in claim 2, it is characterised in that：Remote monitoring module also includes 485 communication units, second processing unit are communicated by 485 communication units with computer.
  4. 4. three-phase imbalance automatic straightening system as claimed in claim 3, it is characterised in that：Remote monitoring module also includes aobvious Show unit, second processing element output signal to display unit.
  5. 5. three-phase imbalance automatic straightening system as claimed in claim 4, it is characterised in that：The signal of second processing unit is defeated Go out end and be connected with warning circuit.
  6. 6. the three-phase imbalance automatic straightening system as described in claim 1 to 5 any one, it is characterised in that：It is wirelessly transferred Module includes wireless transmitting unit and radio receiving unit, and wireless transmitting unit and the signal output part of second processing unit connect Connect, radio receiving unit connects the signal input part of first processing units；Signal is wirelessly transmitted to wirelessly by wireless transmitting unit Receiving unit.
  7. 7. three-phase imbalance automatic straightening system as claimed in claim 6, it is characterised in that：Voltage zero-crossing detection circuit includes Detect optocoupler, diode, first voltage crosses zero resistance, second voltage crosses zero resistance, tertiary voltage crosses zero resistance and the 4th voltage Cross zero resistance；
    First voltage crosses zero resistance, second voltage zero passage resistor coupled in parallel connection the first current-limiting circuit of composition；Tertiary voltage zero passage electricity The second current-limiting circuit is formed after resistance and the 4th voltage zero-cross resistor coupled in parallel, first current-limiting circuit one end connects slowdown monitoring circuit to be checked, separately The first input end of one end connecting detection optocoupler；Second current-limiting circuit one end is grounded, and the second of other end connecting detection optocoupler is defeated Enter end, the first input end for detecting optocoupler is also connected with the positive pole of diode, and the second input for detecting optocoupler is also connected with diode Negative pole；The first output head grounding of optocoupler is detected, detects the signal of the second lead-out terminal connection first processing units of optocoupler Input；Second lead-out terminal of detection optocoupler also passes through voltage zero-cross capacity earth；Detect the second lead-out terminal of optocoupler also Power supply is connected by the 5th voltage zero-cross resistance.
  8. 8. three-phase imbalance automatic straightening system as claimed in claim 7, it is characterised in that：Current over-zero detection circuit includes Second current transformer, the first operational amplifier and the second operational amplifier；The first electric current is in series with second current transformer Cross zero resistance, the first end of the first current over-zero resistance by the first current over-zero capacity earth, the first current over-zero resistance Second end also passes through the second current over-zero resistance by the second current over-zero capacity earth, the first end of the first current over-zero resistance Connect the inverting input of the first operational amplifier；Second end of the first current over-zero resistance is also connected with the first operational amplifier In-phase input end；The 3rd current over-zero electric capacity is connected between the inverting input and in-phase input end of first operational amplifier； The 3rd current over-zero resistance is connected between the output end of the inverting input of first operational amplifier and the first operational amplifier； The positive power end connection power supply of first operational amplifier, the positive power end of the first operational amplifier also pass through the 4th electric current mistake Zero capacitance is grounded；The negative sense power end ground connection of first operational amplifier；The output end of first operational amplifier passes sequentially through the 4th Current over-zero resistance and the 5th current over-zero resistance connect the inverting input of the second operational amplifier；4th current over-zero resistance Also pass through the 5th current over-zero capacity earth；The in-phase input end of second operational amplifier is connected by the 6th current over-zero resistance Power supply；The output end of second operational amplifier connects power supply by the 7th current over-zero resistance；The output of second operational amplifier Also the 8th current over-zero resistance connects the signal input part of second processing unit, the signal input part of second processing unit successively at end Also pass through the 6th current over-zero capacity earth.
  9. 9. three-phase imbalance automatic straightening system as claimed in claim 8, it is characterised in that：Current sampling circuit includes first Current transformer, the first end of first end connection first resistor and the first end of 3rd resistor of the first current transformer；First Second end of resistance connects the second end of the first current transformer by second resistance；The second end connection metering core of 3rd resistor First current difference signal input of piece；The 5th resistance and the first electric capacity being connected in parallel are also associated with 3rd resistor；And The 5th resistance and the first electric capacity of connection connection are also associated with the 6th resistance and the second electric capacity being connected in parallel；The 6th be connected in parallel Resistance and the second electric capacity are also connected with the second current difference signal input；Second end of the first current transformer also passes through the 4th electricity Resistance the second current difference signal input of connection；
    Voltage sampling circuit includes the 7th resistance and the 8th resistance, and the 7th resistance connects circuit to be detected, the 8th resistance connection zero Line；7th resistance connects the first voltage signal input part of computation chip, the second voltage letter of the 8th resistance connection computation chip Number input；Be connected with the 3rd electric capacity and the 4th electric capacity being connected in series between 7th resistance and the 8th resistance, the 7th resistance and The 9th resistance and the tenth resistance being connected in series are also associated between 8th resistance.
CN201720540916.5U 2017-05-16 2017-05-16 A kind of three-phase imbalance automatic straightening system Expired - Fee Related CN206712473U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108365619A (en) * 2018-05-03 2018-08-03 广东电网有限责任公司 Three-phase imbalance commutation device
CN111181180A (en) * 2018-06-07 2020-05-19 安徽南瑞中天电力电子有限公司 Multifunctional automatic phase changing system and method for medium and low voltage line

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108365619A (en) * 2018-05-03 2018-08-03 广东电网有限责任公司 Three-phase imbalance commutation device
CN111181180A (en) * 2018-06-07 2020-05-19 安徽南瑞中天电力电子有限公司 Multifunctional automatic phase changing system and method for medium and low voltage line
CN111181180B (en) * 2018-06-07 2021-07-27 安徽南瑞中天电力电子有限公司 Multifunctional automatic phase changing system and method for medium and low voltage line

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