CN106680550A - Three-phase four-wire electric energy meter with precise zero-crossing phase line switching - Google Patents

Three-phase four-wire electric energy meter with precise zero-crossing phase line switching Download PDF

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Publication number
CN106680550A
CN106680550A CN201710029829.8A CN201710029829A CN106680550A CN 106680550 A CN106680550 A CN 106680550A CN 201710029829 A CN201710029829 A CN 201710029829A CN 106680550 A CN106680550 A CN 106680550A
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node
switch
phase
series
controller
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CN106680550B (en
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不公告发明人
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China Jiliang University
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China Jiliang University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)

Abstract

The invention discloses a three-phase four-wire electric energy meter with precise zero-crossing phase line switching and relates to the technical filed of an electric energy meter. When the powers of the different phases connected to the electric energy meter are unbalanced, part of the loads in high power phase line connected on the three-phase four-wire electric energy meter can be switched to the low power phase line of the three-phase four-wire electric energy meter timely. The three-phase four-wire electric energy meter body is included, and the three-phase four-wire electric energy meter body comprises an A phase, a B phase, a C phase, a zero line N and a three phase electric energy metering module, and also comprises a node J1, a controller, a three phase balance monitor and a single phase inverter and a number 2 voltage sampling circuit and an interface power monitor, wherein the three phase balance monitor, the single phase inverter and the number 2 voltage sampling circuit and the interface power monitor are respectively connected to the controller. The power output side of the single phase inverter is connected with the power input side of an isolation transformer. The node J1 is connected with the power output side of the isolation transformer and the sampling side of the number 2 voltage sampling circuit. The three phase three phase electric energy metering module is connected with the controller.

Description

With the accurate three-phase and four-line electric energy meter for crossing zero phase line switching
Technical field
The present invention relates to electric energy meter technical field, and in particular to the accurate three-phase and four-line electric energy for crossing zero phase line switching Table.
Background technology
With the development of economic society, the type of electrical equipment is more and more.Because current electric power system is typically all Three-phase power supply system, in three-phase power supply system, if power on three-phase occurs larger asymmetric, just occurs electrical network Off-center operation, just occur electrical network shake.
When operation of power networks is in unbalanced state, the transformator in electrical network is at asymmetric operation state, in not right Claiming the transformator of running status can make the zero-sequence current of transformator excessive, and excessive zero-sequence current can make the local part of transformator Temperature increases, if the local Part temperature of transformator increase it is excessive may burn transformator, so as to cause electric power system Power outage.
When unbalanced power supply runs, if wanting to allow the electrical network of off-center operation to be changed into the electrical network of balance movement, at present The method taken is that the part load manual switching on a large scale the high power phase line of section is big to another In the low-power phase line of scope section.Because this switching mode is more in the load that moment switches, cause rushing for moment switching Hit that electric current is excessive, excessive dash current can not only burn out switching equipment, due also in load switching at that moment, the load Power supply phase line difference before and after switching can cause the loaded work piece that chaotic even damage occurs.
Because concrete load is all used by certain particular user, all electricity consumptions of each particular user will use three-phase Four line electric energy meters carry out electric energy metrical, therefore, if can be switched as phase line with all loads that three-phase and four-line electric energy meter is connected Basic phase line switch unit, then as long as the power in each the basic phase line switch unit in whole electrical network is in a basic balance Then it is ensured that the power of whole electrical network is also in a basic balance, will electrical network be in balance movement state.
With the basic phase line switch unit that all loads that three-phase and four-line electric energy meter is connected switch as phase line, this not only increases The motility for having added electrical network phase line to switch, because the load connected on a three-phase and four-line electric energy meter is relative to a piece on a large scale Much less for area, the dash current produced by this phase line switching also wants considerably less.Therefore, if can be by three-phase and four-line electricity The part load being connected in the three-phase and four-line electric energy meter high power phase line is switched to the three-phase and four-line electric energy by energy table in time In table low-power phase line, the motility of whole network load switching is which not only adds, also increase the reliability of phase line switching Property, substantially increase the stability of operation of power networks.Therefore, design a kind of energy basis to be connected in each phase line of three-phase and four-line electric energy meter The unbalanced power of load is automatically obtained and the part load in high power phase line is switched in low-power phase line, and three are made as far as possible The three-phase and four-line electric energy meter of the power-balance in each phase line of the line electric energy meter of phase four seems very necessary.
The content of the invention
The present invention is that do not have phase line handoff functionality to solve existing three-phase and four-line electric energy meter, causes to occur being connected to three-phase One will can not be connected in the three-phase and four-line electric energy meter high power phase line during unbalanced power in each phase of four line electric energy meters Point load is switched to deficiency in the three-phase and four-line electric energy meter low-power phase line, there is provided one kind is when occurring being connected to three-phase and four-line electricity Can be in each phase of table unbalanced power when the part being connected in the three-phase and four-line electric energy meter high power phase line can be born in time Load is switched in the three-phase and four-line electric energy meter low-power phase line, and switching electric current is little, and combination switch will not be burnt out during switching, easily to certainly The set of cells of electricity consumption supply module carries out the three-phase and four-line electric energy meter with accurate zero phase line switching excessively of charge and discharge control.
To achieve these goals, the present invention is employed the following technical solutions：
Three-phase and four-line electric energy meter with accurate zero phase line switching excessively, including three-phase and four-line electric energy meter body, three-phase and four-line Electric energy meter body includes A phase, B phase, C phase, zero line N and three-phase electric energy metering module, also including node J1 and controller and point The three-phase equilibrium monitor that is not connected with controller, voltage sampling circuit, Single-Phase Inverter Source, isolating transformer, No. two Voltage sampling circuit and interface power monitor.The power output end of Single-Phase Inverter Source and the power input of isolating transformer Connection, node J1 is connected respectively with the power output end of isolating transformer and the sampling end of No. two voltage sampling circuits, three-phase electricity Energy metering module is connected with controller.
Also include that the switch Ki that is connected with controller of control end, wherein i are positive integer, 1≤i≤42.
Also include node J18, node J14 and node J6, the zero line of node J18 is connected with A, the live wire of node J14 End is connected with B, and the zero line of node J6 is connected with C.The zero line side of node J18, the zero line side of node J14 and node J6's Zero line side is all connected with zero line N respectively.
The electric energy metrical end of three-phase electric energy metering module, the monitoring side of three-phase equilibrium monitor and a voltage sampling circuit Sampling end be all connected with node J18, node J14 and node J6 respectively.
The power input of Single-Phase Inverter Source is connected by switch K40 with node J18, and the power supply of Single-Phase Inverter Source is defeated Enter end to be connected with node J14 by switch K41, the power input of Single-Phase Inverter Source is connected by switch K42 with node J6.
Loading interfaces also including being connected with the monitoring side of interface power monitor respectively, No. two loading interfaces, three Number loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces.
Also include node J2, node J3, node J4, node J5, node J7, node J8, node J9, node J10, node J11, node J12, node J13, node J15, node J16, node J17 and node J19.
Node J6, switch K13, node J2, switch K14, node J3, switch K15, node J4, switch K16, node J5 and No. six loading interfaces are sequentially connected in series, node J6, switch K21, node J7, switch K22, node J8, switch K23, node J9, Switch K24, node J10 and No. five loading interfaces are sequentially connected in series, node J14, switch K29, node J11, switch K30, section Point J12, switch K31, node J13 and No. four loading interfaces are sequentially connected in series, node J14, switch K34, node J15, switch K35, node J16 and No. three loading interfaces are sequentially connected in series, node J18, switch K38, node J17 and No. two loading interfaces according to Secondary to be connected in series, node J18, switch K39, node J19 and a loading interfaces are sequentially connected in series.
Node J1, switch K1, node J2, switch K17 and node J19 are sequentially connected in series, node J1, switch K2, node J7, switch K25 and node J19 are sequentially connected in series, and node J1, switch K3, node J11, switch K32 and node J19 go here and there successively Connection connection, node J1, switch K4, node J15, switch K36 and node J19 are sequentially connected in series, node J1, switch K5, node J3, switch K18 and node J17 are sequentially connected in series, and node J1, switch K6, node J8, switch K26 and node J17 are sequentially connected in series Connection, node J1, switch K7, node J12, switch K33 and node J17 are sequentially connected in series, node J1, switch K8, node J16, switch K37 and node J17 are sequentially connected in series, and node J1, switch K9, node J4, switch K19 and node J16 go here and there successively Connection connection, node J1, switch K10, node J9, switch K27 and node J16 are sequentially connected in series, node J1, switch K11, node J5, switch K20 and node J13 are sequentially connected in series, and node J1, switch K12, node J10, switch K28 and node J13 go here and there successively Connection connection.
The switch K40, switch K41 and pass K42 are the identical combination switch of circuit structure；Combination switch includes No. two nodes of a number node, switching switch Ka, node Ma, inductance La, node Mb, electric capacity Ca, diode D1, diode D2, two poles Pipe D3, diode D4, electric capacity C0, photoelectrical coupler OPT, resistance R0, from electricity consumption supply module, Magnetic driving electric power road and silicon drive Circuit, switching switch KaIncluding reverse-blocking tetrode thyristor KbK is switched with magnetic latching relayc, photoelectrical coupler OPT include light-emitting diodes Pipe D5With phototriode Q0；Reverse-blocking tetrode thyristor KbOne end and magnetic latching relay switch KcOne end be connected to No. one On node, node can only be connected in the wherein phase in A phases, B phases and C phases this three-phases in discontinuity surface when same；Can Control transwitch KbThe other end, magnetic latching relay switch KcThe other end, inductance LaOne end, diode D1Positive terminal and Diode D3Negative pole end be all connected to node MaOn, inductance LaThe other end, one end of electric capacity Ca and electric capacity C0One end all connect It is connected on node MbOn, the other end of electric capacity Ca is connected on No. two nodes, and No. two nodes are connected on zero line N, diode D2Just Extreme and diode D4Negative pole end be all connected to electric capacity C0The other end on, diode D1Negative pole end and diode D2It is negative Extremely all it is connected to light emitting diode D5Positive terminal on, diode D3Positive terminal and diode D4Positive terminal be all connected to Light emitting diode D5Negative pole end on, phototriode Q0Grounded emitter, phototriode Q0Colelctor electrode respectively with resistance R0One end and controller connection, resistance R0The other end be connected from electricity consumption supply module, silicon drive circuit respectively with controllable silicon Switch KbControl end and controller connection, Magnetic driving circuit respectively with magnetic latching relay switch KcControl end and controller Connection.
Include battery connection module, company can be sequentially connected in series by several separate cells from electricity consumption supply module The set of cells for connecing；From electricity consumption supply module also include charger equal with cell number respectively, switching switch and Current limliting module；Battery connection module includes the bulk charging bindiny mechanism equal with cell number；In each bulk charging connection Bulk voltage detection chip is respectively equipped with mechanism；The power output end of each charger is one-to-one to be connected to each switching switch choosing Select on a terminals at end；The turning end of each switching switch is one-to-one to be connected on one end of current limliting module, each current limliting The other end of module is one-to-one to be connected in the bulk charging bindiny mechanism of battery connection module；Battery connection module is connected to battery In group, the control end of the battery connection module, each bulk voltage detection chip, the control end of each current limliting module and each cut The control end for changing switch is connected respectively with controller；And under the control of the controller, when not charging for set of cells, battery connection Each separate cell in set of cells can be sequentially connected in series and become together series-connected cell by module, when for battery When group charges, the series-connected cell being sequentially connected in series in set of cells together can be become separate list by battery connection module Body battery；
The power input of each charger and the power input of controller are conductively connected to be powered at one and successively control In mechanism processed, and energization priority controlling organization is first powered to controller when upper electric, and charger energization is then given again；In lower electricity Shi Tong electricity priorities controlling organization first allows charger power-off, then allows controller power-off again.
The energization priority controlling organization of this programme is first powered by controller, and controller just allows battery connection module to be incited somebody to action after being powered The series-connected cell being sequentially connected in series in set of cells together becomes separate cell, is then electrified to priority control machine Structure just allows charger to be powered, and so can fully ensure that when charger is powered, be between each cell it is separate, Charging between each cell would not be impacted, automatically controlled so as to easily carry out charge and discharge to the set of cells from electricity consumption supply module System.
This programme is when in use, it is assumed that in general, and a loading interfaces with No. two loading interfaces are supplied by A phases Electricity, No. three loading interfaces with No. four loading interfaces are powered by B phases, and No. five loading interfaces and No. six loading interfaces are all by C Mutually power.
The three-phase equilibrium monitor of this programme is in setting time interval to the A phases of three-phase and four-line electric energy meter, B phases and C phases Power-balance monitoring is carried out, and the data of monitoring are uploaded to into controller, what controller was uploaded immediately to three-phase equilibrium monitor Data carry out calculating process.If there is arbitrarily biphase work(in the data calculating that controller is uploaded to three-phase equilibrium monitor after processing When the difference of rate is more than setting value, then the maximum phase line of current power is found out, if the maximum phase line of current power is A phases.
Then controller just gives immediately one work order of interface power monitor, and interface power monitor is immediately to No. one Loading interfaces, No. two loading interfaces, No. three loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces are entered Row power monitoring, and monitoring result is uploaded into controller, controller received and stood after the data transmitted in one to No. five loading interfaces Carry out calculating process.If after calculating obtaining that the load in a loading interfaces is added in No. six loading interfaces or is added to It is most to allow each phase power of electrical network to keep balance in No. six loading interfaces, then under the control of the controller just by a load The power supply of interface is switched to C phases from A phases.
The power supply of a number loading interfaces is as follows from the handoff procedure that A phases are switched to C phases：
First, it is assumed that before the handover, switch K1 is to switching K20, switch K25, switch K26, switch K27, switch K28, open K32, switch K33, switch K36, switch K37, switch K40, switch K41 and switch K42 are closed all in off-state, switch K21, Switch K22, switch K23, switch K24, switch K29, switch K30, switch K31, switch K34, switch K35, switch K38 and switch K39 is all in closure state.
Then, the switch of a voltage sampling circuit is connected A, the voltage letter of a voltage sampling circuit collection A phase Number and be uploaded to controller.
Then, K42 closures are switched and connects C phases and Single-Phase Inverter Source, the voltage signal of Single-Phase Inverter Source output is with A phases Voltage signal as reference, the voltage signal using Single-Phase Inverter Source output constitutes closed loop control as feedback signal, in control The drive signal of SPWM is produced in device processed, the voltage waveform Jing isolating transformers output for exporting Single-Phase Inverter Source is stable just String ripple power supply.When sine-wave power and the A phase voltages of isolating transformer output are with amplitude same phase, be closed at switching K1 and K17 is switched, and simultaneously switches off switch K39, now power supply shape of the power supply state in a loading interfaces still and in A phases State is identical.
Then, controller adopts phase shifting control, makes after the filtered device filtering of voltage waveform that Single-Phase Inverter Source is exported again Jing isolating transformers export stable sine-wave power.When the sine-wave power and the same amplitude of C phase voltages of isolating transformer output During same phase, switch K1 is disconnected, and be closed at switching K13, now the power supply state in a loading interfaces is just complete Identical with the power supply status in C phases, i.e., now the power supply of a loading interfaces has been switched to C phases from A phases.
Finally switch K42 is disconnected, Single-Phase Inverter Source is bypassed and is exited, so far a Phase-switching end of job. Other loading interfaces switching principles are identical.
In the combination switch of this programme, inductance LaUsing high-frequency inductor, inductance LaInductance be tens microhenrys.When controllable Transwitch KbOr magnetic latching relay switch KcConducting moment, the impedance of electric capacity Ca is about 0, and due to inductance LaPresence, inductance LaIn conducting moment, its frequency changes very greatly, inductance LaImpedance it is also very big, it is suppressed that power supply turn on moment dash current；When During normal circuit operation, because supply frequency is 50Hz power frequencies, then inductance LaImpedance very little.
In inductance LaIn, inductance LaVoltage ULaAdvanced inductance LaElectric current I190 degree, i.e. inductance LaElectric current I1Fall behind electricity Sense LaVoltage ULa90 degree.
In electric capacity C0In, electric capacity C0Electric current I2Advanced electric capacity C0Voltage UC090 degree, i.e. electric capacity C0Voltage UC0Fall behind electricity Hold C0Electric current I290 degree.
Electric current I1By inductance La, electric capacity Ca formed closed-loop path, then have inductance LaOn voltage ULaAdvanced inductance LaOn Electric current I190 degree.
As inductance LaVoltage ULaIn node M sometimeaPoint for just, node MbPoint for it is negative when, then electric current I2From node MaPoint passes through diode D1, light emitting diode D5, diode D4With electric capacity C0Form branch road.
Ignore diode D1, light emitting diode D5With diode D4Pressure drop, it is clear that have i.e. ULa=UC0, i.e. inductance LaElectricity Pressure ULaEqual to electric capacity C0Voltage UC0.Obviously there is inductance LaOn voltage ULaDelayed electric capacity C0On electric current I290 degree, so as to have Electric capacity C0On electric current I2With inductance LaOn electric current I1Each other reversely, i.e. electric current I2With electric current I1It is reverse each other.UCNIt is in C phases Voltage.
As electric current I2It is positive and more than light emitting diode D5During luminous minimum current, the output signal U of photoelectrical couplerI0 It is changed into low level, reasonable selection electric capacity C from high level0, make electric capacity C0On electric current I2Positive going zeror crossing point and can be rapidly achieved send out Optical diode D5Luminous minimum current.
As electric current I2After positive going zeror crossing point, the output signal U of photoelectrical couplerI0It is changed into low level from high level, due to Electric current I2With electric current I1Reversely, then there is the output signal U when photoelectrical couplerI0When being changed into high level from low level, electric current I1Just In positive going zeror crossing point.Therefore the output signal U of photoelectrical couplerI0When being changed into high level from low level, that is, obtain electric current I1 Zero crossing electric current.When obtaining electric current I1Zero crossing electric current when, controller can immediately give magnetic latching relay switch KcSend out Go out to be opened or closed signal.Magnetic latching relay is allowed to switch K if desiredcDisconnect, then controller is just opened to magnetic latching relay Close KcSend disconnection control signal, magnetic latching relay switch KcThen turn off；Magnetic latching relay is allowed to switch K if desiredcClose Close, then controller just switchs K to magnetic latching relaycSend closure control signal, magnetic latching relay switch KcClose immediately. This programme is switched further according to the correct time point from by obtaining correct time point during current zero-crossing point to magnetic latching relay KcSend the control signal that is opened or closed to make magnetic latching relay switch KcContact be opened or closed, then flow through magnetic guarantor Hold relay switch KcElectric current it is little, be opened or closed in small current magnetic latching relay switch KcSo that magnetic latching relay Switch KcContact be hardly damaged.So as to effectively extend magnetic latching relay switch KcLife-span, and then extend compound opening The service life of pass.
When combination switch is put into, because reverse-blocking tetrode thyristor KbThe moment of conducting, due to inductance LaElectric current inhibitory action, Big dash current will not occur, and due to reverse-blocking tetrode thyristor KbConduction voltage drop very little, and inductance LaThe impedance under work frequency Very little, node MaAnd node MbThe pressure drop of point-to-point transmission is less, now closes magnetic latching relay switch Kc, to magnetic latching relay Switch KcContact infringement very little, so as to effectively extend control transwitch KbLife-span, and then extend the use of combination switch Life-span.
This programme is in reverse-blocking tetrode thyristor KbIt is on and magnetic latching relay switch KcIn when closing, if to turn off Reverse-blocking tetrode thyristor Kb, then in electric current I1Just allow reverse-blocking tetrode thyristor K during zero crossingbDisconnect, so being capable of effective protection reverse-blocking tetrode thyristor KbService life.
This programme is only in the reverse-blocking tetrode thyristor K that combination switch is put into C phasesbWhen just adopt voltage over zero when throw Enter, as long as all being put into or being cut off using current over-zero in the case of having electric current on combination switch, substantially increase compound The service life of switch, reliability is higher, and safety is preferable.
In this programme, as reverse-blocking tetrode thyristor KbDuring conducting, in magnetic latching relay K is switchedcIn the case of being also not turned off, Magnetic latching relay switch K nowcIt is also conducting, you can control transwitch KbK is switched with magnetic latching relaycSimultaneously now It is in the conduction state.Due to reverse-blocking tetrode thyristor KbBranch road has inductance LaConducting resistance, it is clear that magnetic latching relay switch Kc The impedance on road will be far smaller than reverse-blocking tetrode thyristor KbThe impedance of branch road, therefore flow through magnetic latching relay switch KcElectric current be more than Flow through reverse-blocking tetrode thyristor KbThe electric current of branch road.If magnetic latching relay switchs KcNot in current zero-crossing point break contact, easily damage Contact.This programme is from by obtaining inductance LaThe electric current I of branch road1Correct time point during zero crossing, then allow controller to send control Signal come disconnect magnetic latching relay switch KcContact, allow magnetic latching relay switch KcClosed when electric current is less or Disconnection action, thus easy burn-out magnetic latching relay does not switch KcOn contact, effectively extend magnetic latching relay and open Close KcService life, and then also extend the service life of combination switch, simple structure, reliability is high.
The three-phase and four-line electric energy meter of this programme is when there is the unbalanced power being connected in each phase of three-phase and four-line electric energy meter In time the part load being connected in the three-phase and four-line electric energy meter high power phase line can be switched to into the three-phase and four-line electric energy meter In low-power phase line, and the power supply phase line of each loading interfaces can any switching laws, switching electric current is little, will not burn out during switching multiple Combination switch.The three-phase and four-line electric energy meter not only increases the motility of whole network load switching, also increases phase line switching Reliability, can greatly improve the stability and reliability of operation of power networks, and simple structure, intelligence degree is high, good reliability.We Case by obtaining current zero-crossing point, then sends control signal in switching combination switch, is opened or closed touching for combination switch Point, the little contact for being hardly damaged combination switch of switching electric current, effectively extends the life-span of combination switch.
Preferably, also including the memorizer being connected with controller.Memorizer is easy to store the letter of three-phase and four-line electric energy meter Breath, it is simple and easy to use.
Preferably, also including filter, filter is connected in series in the power output end of Single-Phase Inverter Source and isolation On line between the power input of transformator.Filter improve isolating transformer input reliability, and then cause every Reliability from transformator output is higher.
Preferably, the no-load voltage ratio of isolating transformer is more than 1.17.Due to the width of the sinusoidal voltage of Single-Phase Inverter Source output 0.85 times of the maximum only input voltage of value, therefore isolating transformer is connected in the back of wave filter, no-load voltage ratio is more than 1.17, so that The output voltage amplitude of switching three-phase and four-line electric energy meter reaches 220V, improves the practicality and reliability of three-phase and four-line electric energy meter Property.
Preferably, also including the accurate operating passing zero control method of combination switch, the accurate zero passage of the combination switch Switching control method is as follows：
(1-1) combination switch is put into；
(1-1-1) when to put into combination switch to live wire C, voltage U on live wire C is first detectedCNDuring accurate during zero crossing Between point, as voltage UCNDuring zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbSend conductivity control signal, reverse-blocking tetrode thyristor KbWith Turn on；
(1-1-2) as reverse-blocking tetrode thyristor KbAfter conducting setting time, electric current I is first detected1Correct time point during zero crossing, As electric current I1During zero crossing, controller switchs K to magnetic latching relay immediatelycClosure control signal is sent, magnetic latching relay is opened Close KcClose immediately；
(1-1-3) electric current I and then is again detected1Correct time point during zero crossing, as electric current I1During zero crossing, controller Immediately to reverse-blocking tetrode thyristor KbSend shut-off control signal, reverse-blocking tetrode thyristor KbTurn off immediately, now only opened by magnetic latching relay Close KcCurrent supply circuit work is kept, combination switch devoting oneself to work to live wire C is so far completed；
(1-2) combination switch is cut off；
(1-2-1) when to cut off the combination switch on live wire C, electric current I is first detected1Correct time point during zero crossing, As electric current I1During zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbSend conductivity control signal, reverse-blocking tetrode thyristor KbLead immediately Logical, time delay makes for a period of time reverse-blocking tetrode thyristor KbReliable conducting；
(1-2-2) in reverse-blocking tetrode thyristor KbIn the case of conducting, electric current I is detected again1Correct time point during zero crossing, As electric current I1During zero crossing, controller switchs K to magnetic latching relay immediatelycDisconnection control signal is sent, magnetic latching relay is opened Close KcThen turn off；
(1-2-3) electric current I and then is again detected1Correct time point during zero crossing, as electric current I1During zero crossing, controller Immediately to reverse-blocking tetrode thyristor KbSend shut-off control signal, reverse-blocking tetrode thyristor KbTurn off immediately；So far combination switch is from live wire C On cut off completely.
The present invention can reach following effect：
Three-phase and four-line electric energy meter of the present invention energy when there is the unbalanced power being connected in each phase of three-phase and four-line electric energy meter In time the part load being connected in the three-phase and four-line electric energy meter high power phase line is switched to into the three-phase and four-line electric energy meter low In power phase line, switching electric current is little, and combination switch will not be burnt out during switching, which not only adds whole network load switching Motility, also increases the reliability of phase line switching, can greatly improve the stability and reliability of operation of power networks, intelligence degree Height, good reliability, so as to easily carry out charge and discharge control to the set of cells from electricity consumption supply module.
Description of the drawings
Fig. 1 is a kind of use state circuit theory attachment structure schematic diagram before embodiment of the present invention switching.
Fig. 2 is on the basis of Fig. 1, to allow in handoff procedure the sine-wave power and A phase voltages for exporting isolating transformer With a kind of use state circuit theory attachment structure schematic diagram during amplitude same phase.
Fig. 3 is on the basis of Fig. 2, to allow switch K1 and switch K17 closures, one kind when allowing switch K39 to disconnect to use shape State circuit theory attachment structure schematic diagram.
Fig. 4 is on the basis of Fig. 3, to allow switch K13 to close, and allows switch K1 to disconnect, and makes the power supply of a loading interfaces Power supply has been switched to completely a kind of use state circuit theory attachment structure schematic diagram in C phases from A phases.
Fig. 5 is a kind of circuit theory attachment structure schematic diagram of the embodiment of the present invention from electricity consumption supply module.
Fig. 6 is that the embodiment of the present invention upper electric magnet from a bulk charging bindiny mechanism of electricity consumption supply module is pressed on down A kind of attachment structure schematic diagram when on electric magnet.
Fig. 7 is that the embodiment of the present invention upper electric magnet from a bulk charging bindiny mechanism of electricity consumption supply module is not pressed in A kind of attachment structure schematic diagram when on lower electromagnet.
Fig. 8 be the embodiment of the present invention from charger and microcontroller at the energization priority controlling organization of electricity consumption supply module all A kind of use state attachment structure schematic diagram during electricity is not also gone up.
Fig. 9 be the embodiment of the present invention from the energization priority controlling organization of electricity consumption supply module be in upper electric when, only micro-control A kind of use state attachment structure schematic diagram when the power input positive pole of device processed has been powered on.
Figure 10 be the embodiment of the present invention from the energization priority controlling organization of electricity consumption supply module be in upper electric when, only micro-control One kind that the power input positive pole of device processed switches on power when also having been turned on power supply with the power input negative pole of microcontroller makes Use state attachment structure schematic diagram.
Figure 11 be the embodiment of the present invention from the energization priority controlling organization of electricity consumption supply module be in upper electric when, only micro-control The power input positive pole of device processed switches on power, the power input negative pole of microcontroller also has been turned on the electricity of power supply and charger Source input anode also has been turned on a kind of use state attachment structure schematic diagram during power supply.
Figure 12 be the embodiment of the present invention from the energization priority controlling organization of electricity consumption supply module be in upper electric when, microcontroller Power input positive pole switch on power, the power input negative pole of microcontroller also has been turned on power supply, the power supply of charger is defeated Enter a kind of use state connection that proper pole also has been turned on when the power input negative pole of power supply and charger also has been turned on power supply Structural representation.
Figure 13 is a kind of circuit theory attachment structure schematic diagram that combination switch of the present invention is connected with controller and C phases.
Figure 14 is a kind of circuit theory attachment structure schematic block diagram that present invention switch K1 to K42 is connected with controller.
Figure 15 is that the present embodiment is connected from a kind of circuit theory that each part of electricity consumption supply module is connected with controller Structural schematic block diagram.
Specific embodiment
Below by embodiment, and accompanying drawing is combined, technical scheme is described in further detail.
Embodiment：With the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, referring to shown in Fig. 1-Figure 14, including three-phase Four line electric energy meter bodies, three-phase and four-line electric energy meter body includes A phase, B phase, C phase, zero line N and three-phase electric energy metering module 110. Also include node J1, filter 104 and controller 107 and the three-phase equilibrium monitor 101, being connected with controller respectively Voltage sampling circuit 102, Single-Phase Inverter Source 103, isolating transformer 105,106, No. two and of voltage sampling circuit 108 of memorizer Interface power monitor 109.Filter respectively with the power output end and the power input of isolating transformer of Single-Phase Inverter Source End connection, node J1 is connected respectively with the power output end of isolating transformer and the sampling end of No. two voltage sampling circuits, three-phase Electric energy metering module is connected with controller.The no-load voltage ratio of isolating transformer is more than 1.17.
Also include that the switch Ki that is connected with controller of control end, wherein i are positive integer, i=1,1≤i≤42.
Also include node J18, node J14 and node J6, the zero line of node J18 is connected with A, the live wire of node J14 End is connected with B, and the zero line of node J6 is connected with C.The zero line side of node J18, the zero line side of node J14 and node J6's Zero line side is all connected with zero line N respectively.
The electric energy metrical end of three-phase electric energy metering module, the monitoring side of three-phase equilibrium monitor and a voltage sampling circuit Sampling end be all connected with node J18, node J14 and node J6 respectively.
The power input of Single-Phase Inverter Source is connected by switch K40 with node J18, and the power supply of Single-Phase Inverter Source is defeated Enter end to be connected with node J14 by switch K41, the power input of Single-Phase Inverter Source is connected by switch K42 with node J6.
Also include 201, No. two loading interfaces of a loading interfaces being connected with the monitoring side of interface power monitor respectively 202nd, No. three loading interfaces 205 of loading interfaces 204, five of loading interfaces 203, four and No. six loading interfaces 206.One
Also include node J2, node J3, node J4, node J5, node J7, node J8, node J9, node J10, node J11, node J12, node J13, node J15, node J16, node J17 and node J19.
Node J6, switch K13, node J2, switch K14, node J3, switch K15, node J4, switch K16, node J5 and No. six loading interfaces are sequentially connected in series, node J6, switch K21, node J7, switch K22, node J8, switch K23, node J9, Switch K24, node J10 and No. five loading interfaces are sequentially connected in series, node J14, switch K29, node J11, switch K30, section Point J12, switch K31, node J13 and No. four loading interfaces are sequentially connected in series, node J14, switch K34, node J15, switch K35, node J16 and No. three loading interfaces are sequentially connected in series, node J18, switch K38, node J17 and No. two loading interfaces according to Secondary to be connected in series, node J18, switch K39, node J19 and a loading interfaces are sequentially connected in series.
Node J1, switch K1, node J2, switch K17 and node J19 are sequentially connected in series, node J1, switch K2, node J7, switch K25 and node J19 are sequentially connected in series, and node J1, switch K3, node J11, switch K32 and node J19 go here and there successively Connection connection, node J1, switch K4, node J15, switch K36 and node J19 are sequentially connected in series, node J1, switch K5, node J3, switch K18 and node J17 are sequentially connected in series, and node J1, switch K6, node J8, switch K26 and node J17 are sequentially connected in series Connection, node J1, switch K7, node J12, switch K33 and node J17 are sequentially connected in series, node J1, switch K8, node J16, switch K37 and node J17 are sequentially connected in series, and node J1, switch K9, node J4, switch K19 and node J16 go here and there successively Connection connection, node J1, switch K10, node J9, switch K27 and node J16 are sequentially connected in series, node J1, switch K11, node J5, switch K20 and node J13 are sequentially connected in series, and node J1, switch K12, node J10, switch K28 and node J13 go here and there successively Connection connection.
Switch K40, switch K41 and pass K42 are the identical combination switch of circuit structure；It is shown in Figure 13, it is multiple Combination switch includes 701, No. two nodes 702 of a node, switching switch Ka, node Ma, inductance La, node Mb, electric capacity Ca, two poles Pipe D1, diode D2, diode D3, diode D4, electric capacity C0, photoelectrical coupler OPT, resistance R0, from electricity consumption supply module 901, Magnetic driving electric power road 502 and silicon drive circuit 503, switching switch KaIncluding reverse-blocking tetrode thyristor KbK is switched with magnetic latching relayc, Photoelectrical coupler OPT includes light emitting diode D5With phototriode Q0；Reverse-blocking tetrode thyristor KbOne end and magnetic latching relay open Close KcOne end be connected on a node 701, a node 701 can only be connected to A phases, B in discontinuity surface when same In a wherein phase mutually and in C phases this three-phases；Reverse-blocking tetrode thyristor KbThe other end, magnetic latching relay switch KcThe other end, electricity Sense LaOne end, diode D1Positive terminal and diode D3Negative pole end be all connected to node MaOn, inductance LaThe other end, electricity Hold one end and the electric capacity C of Ca0One end be all connected to node MbOn, the other end of electric capacity Ca is connected on No. two nodes 702, and two Number node 702 is connected on zero line N, diode D2Positive terminal and diode D4Negative pole end be all connected to electric capacity C0It is another On end, diode D1Negative pole end and diode D2Negative pole end be all connected to light emitting diode D5Positive terminal on, diode D3 Positive terminal and diode D4Positive terminal be all connected to light emitting diode D5Negative pole end on, phototriode Q0Emitter stage Ground connection, phototriode Q0Colelctor electrode respectively with resistance R0One end and controller connection, resistance R0The other end with from electricity consumption Supply module connect, silicon drive circuit respectively with reverse-blocking tetrode thyristor KbControl end and controller connection, Magnetic driving circuit difference K is switched with magnetic latching relaycControl end and controller connection.
Referring to shown in Fig. 5, Figure 15, from electricity consumption supply module include battery connection module t22, can be separate by several Set of cells t26 that is connected together in series of cell；From electricity consumption supply module also include respectively with cell number Equal charger, switching switch and current limliting module, battery connection module includes that the bulk charging equal with cell number connects Connection mechanism；Bulk voltage detection chip t101 is respectively equipped with each bulk charging bindiny mechanism；The power supply output of each charger One-to-one each the switching switch that is connected in end is selected on a terminals at end；The one-to-one connection of turning end of each switching switch On one end of current limliting module, the one-to-one bulk charging connection machine for being connected to battery connection module of the other end of each current limliting module On structure；Battery connection module connects on the battery pack, the control end of the battery connection module t22, each bulk voltage detection core The control end of piece t101, the control end of each current limliting module and each switching switch is connected respectively with controller；And in controller Control under, when not charging for set of cells, battery connection module can by each separate cell in set of cells according to Secondary being connected in series becomes series-connected cell, and when charging for set of cells, battery connection module will can successively go here and there in set of cells The series-connected cell that connection links together becomes separate cell.
Charger in this example is charger t2, charging t3 and charger t4.Switching switch in this example is switching Switch t5, switching switch t6 and switching switch t7.Current limliting module in this example is limited flow module t9, current limliting module t10 and limit Flow module t11.The selection end of each switching switch includes terminals d, terminals e and terminals f.Controller in this example As microcontroller.
It is shown in Figure 5, if the cell of the present embodiment set of cells has three, and set these three cell difference For a cell t19, No. two cell t20 and No. three cell t21；The bulk charging connection machine of battery connection module Structure has three, and sets these three bulk charging bindiny mechanisms and be respectively a bulk charging bindiny mechanism t12, No. two bulk chargings connections Mechanism t13 and No. three bulk charging bindiny mechanism t14；Battery connection module also includes that group power output interface t15, a hilted broadsword are double Throw switch t17, No. two single-pole double-throw switch (SPDT) t18 and single knife switch t16；It is double that the positive pole of a number cell is connected to a hilted broadsword In the turning end of throw switch, the positive terminal of a contact portion of a single-pole double-throw switch (SPDT) in a bulk charging bindiny mechanism On end, No. two contact portions of a single-pole double-throw switch (SPDT) on No. two contacts of No. two single-pole double-throw switch (SPDT)s, a monomer electricity The negative pole in pond is connected in the negative terminals of a bulk charging bindiny mechanism, and the negative pole of a cell is also connected to a group electricity In the negative terminals of source output interface；The positive pole of No. two cells is connected to the positive terminal of No. two bulk charging bindiny mechanisms On end, the positive pole of No. two cells is also connected on the positive terminal of group power output interface, No. two cells it is negative Pole is connected in the negative terminals of No. two bulk charging bindiny mechanisms, and the negative pole of No. two cells is also connected to single knife switch On one end；The negative pole t 25 of No. three cells is connected in the turning end of No. two single-pole double-throw switch (SPDT)s, No. two single-pole double-throw switch (SPDT)s A contact portion in the negative terminals of No. three bulk charging bindiny mechanisms, the positive pole t23 of No. three cells is connected to On the positive terminal of No. three bulk charging bindiny mechanisms, the positive pole of No. three cells is also connected to the other end of single knife switch On；The control end point of the control end of a number single-pole double-throw switch (SPDT), the control end of No. two single-pole double-throw switch (SPDT)s and single knife switch It is not connected with controller.
No. two contacts of a number single-pole double-throw switch (SPDT) and No. two contacts of No. two single-pole double-throw switch (SPDT)s are normally closed touching Point, when set of cells charges, No. two contacts of a single-pole double-throw switch (SPDT) and No. two contacts of No. two single-pole double-throw switch (SPDT)s are in Off-state, in set of cells no charging, No. two contacts of a number single-pole double-throw switch (SPDT) and No. two of No. two single-pole double-throw switch (SPDT)s are touched Point is in closure state；A number contact of a number single-pole double-throw switch (SPDT) and a contact of No. two single-pole double-throw switch (SPDT)s are equal For normally opened contact, when set of cells charges, No. of a contact of a single-pole double-throw switch (SPDT) and No. two single-pole double-throw switch (SPDT)s is touched Point is in closure state, a contact of a single-pole double-throw switch (SPDT) and No. two single-pole double-throw switch (SPDT)s when set of cells does not charge A contact be in off-state；The single knife switch is off when set of cells charges, and does not fill in set of cells Closure state is in when electric.
Referring to shown in Fig. 6, Fig. 7, each bulk charging bindiny mechanism includes that lower horizontal block t30 of sliding chamber t29, insulation, insulation are slided Horizontal block t36, sliding bar t32 and activity horizontal block t31 on motion block t38, insulation, the positive terminal of bulk charging bindiny mechanism is including upper Positive terminal termination t28 and lower positive terminal termination t27, the negative terminals of bulk charging bindiny mechanism include upper negative terminals Head t39 and lower negative terminal termination t40；Insulated slide block is slidably arranged in sliding intracavity, and the lower horizontal block of insulation is fixedly installed on insulation Sliding intracavity below sliding shoe, horizontal block is fixedly installed on the sliding intracavity above insulated slide block, activity horizontal block activity cloth in insulation The sliding intracavity above horizontal block in insulation is put, upper positive terminal termination and upper negative terminal termination are arranged at insulated slide block On lower surface, lower positive terminal termination and lower negative terminal termination be arranged at insulating lower horizontal block upper surface on, in insulation Horizontal block is provided with vertical through hole t34, and sliding bar is slidably arranged in vertical through hole, and sliding bar upper end is fixedly connected on activity horizontal block On, sliding bar lower end is fixedly connected in the upper horizontal block of insulation, is set on the sliding bar in insulation between horizontal block and insulated slide block Spring t37 is pulled open, the two ends for pulling open spring extrude be connected on the lower surface of the upper horizontal block of insulation and insulated slide block respectively On upper surface；Lower electromagnet t35 is fixed with the upper surface of horizontal block in the insulation, in activity horizontal block electric magnet is provided with T33, and upper electric magnet when being powered the electromagnetic force that produces and lower electromagnet when logical the electromagnetic force of electricity generation attract each other, and upper electricity The electromagnetic force that Magnet is produced when being powered can promote insulated slide block after attracting each other with the lower electromagnet electromagnetic force that electricity is produced when logical Move down, and upper positive terminal termination can be compressed and be conductively connected on lower positive terminal termination and can be by upper negative terminals Head is compressed and is conductively connected on lower negative terminal termination.
The positive pole of each cell is one-to-one to be connected electrically on lower positive terminal termination, the negative pole one of each cell It is connected electrically in one on lower negative terminal termination, positive terminal in the one-to-one electrical connection of positive pole of the other end of each current limliting module On termination, in the one-to-one electrical connection of negative pole of the other end of each current limliting module on negative terminal termination.
Referring to shown in Fig. 8-Figure 12, the power input of each charger and the power input of controller are conductively connected On an energization priority controlling organization t75, and energization priority controlling organization is first powered to controller when upper electric, Ran Houzai It is powered to charger；Energization priority controlling organization first allows charger power-off when lower electric, then allows controller power-off again.
Referring to shown in Fig. 8-Figure 12, energization priority controlling organization include the insulation tube t62 of right-hand member sealing, an insulation block t64, Insulated slide bar t63 and handle t61, insulation block is fixed on t66 in insulation tube, and on insulation block slide opening t65 is transversely provided with, Insulated slide bar is slidably arranged in slide block, and handle is fixedly connected on the left end of insulated slide bar；Under the inner tubal wall of insulation tube From left to right it is fixed with a positive terminal termination t71, negative terminal termination t72, No. two positive poles on bottom surface successively to connect End t73 and No. two negative terminal termination t74, and the height of a positive terminal termination is higher than a negative terminal termination Height it is high, the height of a negative terminal termination is high higher than the height of No. two positive terminal terminations, No. two positive terminal terminations The high height higher than No. two negative terminal terminations of height it is high；From a left side on the lower surface of the insulated slide bar of insulation block right To the right side be fixed with successively No. three positive terminal termination t67, No. three negative terminal termination t68, No. four positive terminal termination t69 and No. four negative terminal termination t70, and when insulated slide bar moves to setting position, No. three positive terminal terminations can compress leads It is connected electrically on a positive terminal termination, No. three negative terminal terminations can compress and be conductively connected a negative terminal termination On, No. four positive terminal terminations can compress and be conductively connected on No. two positive terminal terminations, and No. four negative terminal terminations can compress It is conductively connected on No. two negative terminal terminations；The power input positive pole of controller is connected electrically in positive terminal termination Lower end, the power input negative pole of controller is connected electrically in the lower end of a negative terminal termination, the power input of charger Positive pole is connected electrically in the lower end of No. two positive terminal terminations, and the power input negative pole of charger is connected electrically in No. two negative terminals The lower end of termination；No. three positive terminal terminations and No. four positive terminal terminations are both electrically connected with the power supply in energization priority controlling organization On the positive pole of input；No. three negative terminal terminations and No. four negative terminal terminations are both electrically connected with energization priority controlling organization On the negative pole of power input.
Figure 13 is a kind of circuit theory attachment structure schematic diagram that combination switch of the present invention is connected with controller and C phases. Combination switch is identical with the connection circuit of C phases with the connection circuit and combination switch of A phases and B phases.
The present embodiment is when in use, shown in Figure 1, it is assumed that in general, a loading interfaces and No. two load Interface is powered by A phases, and No. three loading interfaces with No. four loading interfaces are powered by B phases, No. five loading interfaces and No. six Loading interfaces are powered by C phases.
The three-phase equilibrium monitor of the present embodiment is in setting time interval to the A phases of three-phase and four-line electric energy meter, B phases and C Power-balance monitoring is mutually carried out, and the data of monitoring are uploaded to into controller, controller is uploaded immediately to three-phase equilibrium monitor Data carry out calculating process.If the data calculating that controller is uploaded to three-phase equilibrium monitor occurs arbitrarily biphase after processing When the difference of power is more than setting value, then the maximum phase line of current power is found out, if the maximum phase line of current power is A phases.
Then controller just gives immediately one work order of interface power monitor, and interface power monitor is immediately to No. one Loading interfaces, No. two loading interfaces, No. three loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces are entered Row power monitoring, and monitoring result is uploaded into controller, controller received and stood after the data transmitted in one to No. five loading interfaces Carry out calculating process.If after calculating obtaining that the load in a loading interfaces is added in No. six loading interfaces or is added to It is most to allow each phase power of electrical network to keep balance in No. six loading interfaces, then under the control of the controller just by a load The power supply of interface is switched to C phases from A phases.
The power supply of a number loading interfaces is as follows from the handoff procedure that A phases are switched to C phases：
First, it is shown in Figure 1, it is assumed that before the handover, switch K1 to switch K20, switch K25, switch K26, switch K27, switch K28, switch K32, switch K33, switch K36, switch K37, switch K40, switch K41 and switch K42 are all in disconnected Open state, switch K21, switch K22, switch K23, switch K24, switch K29, switch K30, switch K31, switch K34, switch K35, switch K38 and switch K39 are all in closure state.
Then, the switch of a voltage sampling circuit is connected A, the voltage letter of a voltage sampling circuit collection A phase Number and be uploaded to controller.
Then, referring to shown in Fig. 2, Fig. 3, switch K42 closures connect C phases and Single-Phase Inverter Source, and Single-Phase Inverter Source is defeated The voltage signal for going out using the voltage signal of A phases as reference, the voltage signal using Single-Phase Inverter Source output as feedback signal, Closed loop control is constituted, the drive signal of SPWM is produced in the controller, the voltage waveform for exporting Single-Phase Inverter Source is filtered Again Jing isolating transformers export stable sine-wave power after device filtering.When the sine-wave power and A phases of isolating transformer output When voltage is with amplitude same phase, it is closed at switching K1 and switch K17, and simultaneously switches off switch K39, now a loading interfaces On power supply state or identical with the power supply status in A phases.
Then, shown in Figure 4, controller adopts phase shifting control, makes the voltage waveform Jing filters that Single-Phase Inverter Source is exported Again Jing isolating transformers export stable sine-wave power after the filtering of ripple device.When the sine-wave power and C of isolating transformer output When phase voltage is with amplitude same phase, switch K1 is disconnected, and be closed at switching K13, now the power supply electricity in a loading interfaces Source state is just completely identical with the power supply status in C phases, i.e., now the power supply of a loading interfaces is switched to from A phases C phases.
Finally switch K42 is disconnected, Single-Phase Inverter Source is bypassed and is exited, so far a Phase-switching end of job. Other loading interfaces switching principles are identical.
In the combination switch of the present embodiment, inductance LaUsing high-frequency inductor, inductance LaInductance be tens microhenrys.When can Control transwitch KbOr magnetic latching relay switch KcConducting moment, the impedance of electric capacity Ca is about 0, and due to inductance LaPresence, electricity Sense LaIn conducting moment, its frequency changes very greatly, inductance LaImpedance it is also very big, it is suppressed that power supply turn on moment dash current； When normal circuit operation, because supply frequency is 50Hz power frequencies, then inductance LaImpedance very little.
In inductance LaIn, inductance LaVoltage ULaAdvanced inductance LaElectric current I190 degree, i.e. inductance LaElectric current I1Fall behind electricity Sense LaVoltage ULa90 degree.
In electric capacity C0In, electric capacity C0Electric current I2Advanced electric capacity C0Voltage UC090 degree, i.e. electric capacity C0Voltage UC0Fall behind electricity Hold C0Electric current I290 degree.
Electric current I1By inductance La, electric capacity Ca formed closed-loop path, then have inductance LaOn voltage ULaAdvanced inductance LaOn Electric current I190 degree.
As inductance LaVoltage ULaIn node M sometimeaPoint for just, node MbPoint for it is negative when, then electric current I2From node MaPoint passes through diode D1, light emitting diode D5, diode D4With electric capacity C0Form branch road.
Ignore diode D1, light emitting diode D5With diode D4Pressure drop, it is clear that have i.e. ULa=UC0, i.e. inductance LaElectricity Pressure ULaEqual to electric capacity C0Voltage UC0.Obviously there is inductance LaOn voltage ULaDelayed electric capacity C0On electric current I290 degree, so as to have Electric capacity C0On electric current I2With inductance LaOn electric current I1Each other reversely, i.e. electric current I2With electric current I1It is reverse each other.UCNIt is in C phases Voltage.
As electric current I2It is positive and more than light emitting diode D5During luminous minimum current, the output signal U of photoelectrical couplerI0 It is changed into low level, reasonable selection electric capacity C from high level0, make electric capacity C0On electric current I2Positive going zeror crossing point and can be rapidly achieved send out Optical diode D5Luminous minimum current.
As electric current I2After positive going zeror crossing point, the output signal U of photoelectrical couplerI0It is changed into low level from high level, due to Electric current I2With electric current I1Reversely, then there is the output signal U when photoelectrical couplerI0When being changed into high level from low level, electric current I1Just In positive going zeror crossing point.Therefore the output signal U of photoelectrical couplerI0When being changed into high level from low level, that is, obtain electric current I1 Zero crossing electric current.When obtaining electric current I1Zero crossing electric current when, controller can immediately give magnetic latching relay switch KcSend out Go out to be opened or closed signal.Magnetic latching relay is allowed to switch K if desiredcDisconnect, then controller is just opened to magnetic latching relay Close KcSend disconnection control signal, magnetic latching relay switch KcThen turn off；Magnetic latching relay is allowed to switch K if desiredcClose Close, then controller just switchs K to magnetic latching relaycSend closure control signal, magnetic latching relay switch KcClose immediately. The present embodiment is opened magnetic latching relay from by obtaining correct time point during current zero-crossing point further according to the correct time point Close KcSend the control signal that is opened or closed to make magnetic latching relay switch KcContact be opened or closed, then flow through magnetic Guard relay switchs KcElectric current it is little, be opened or closed in small current magnetic latching relay switch KcSo that magnetic keeps relay Device switchs KcContact be hardly damaged.So as to effectively extend magnetic latching relay switch KcLife-span, and then extend compound The service life of switch.
When combination switch is put into, because reverse-blocking tetrode thyristor KbThe moment of conducting, due to inductance LaElectric current inhibitory action, Big dash current will not occur, and due to reverse-blocking tetrode thyristor KbConduction voltage drop very little, and inductance LaThe impedance under work frequency Very little, node MaAnd node MbThe pressure drop of point-to-point transmission is less, now closes magnetic latching relay switch Kc, to magnetic latching relay Switch KcContact infringement very little, so as to effectively extend control transwitch KbLife-span, and then extend the use of combination switch Life-span.
The present embodiment is in reverse-blocking tetrode thyristor KbIt is on and magnetic latching relay switch KcIn when closing, if to close Disconnected reverse-blocking tetrode thyristor Kb, then in electric current I1Just allow reverse-blocking tetrode thyristor K during zero crossingbDisconnect, so can effective protection controllable silicon open Close KbService life.
The present embodiment is only in the reverse-blocking tetrode thyristor K that combination switch is put into C phasesbWhen just adopt voltage over zero when throw Enter, as long as all being put into or being cut off using current over-zero in the case of having electric current on combination switch, substantially increase compound The service life of switch, reliability is higher, and safety is preferable.
In the present embodiment, as reverse-blocking tetrode thyristor KbDuring conducting, in magnetic latching relay K is switchedcSituation about being also not turned off Under, magnetic latching relay now switchs KcIt is also conducting, you can control transwitch KbK is switched with magnetic latching relaycIt is now same When it is in the conduction state.Due to reverse-blocking tetrode thyristor KbBranch road has inductance LaConducting resistance, it is clear that magnetic latching relay switch Kc The impedance of branch road will be far smaller than reverse-blocking tetrode thyristor KbThe impedance of branch road, therefore flow through magnetic latching relay switch KcElectric current it is big In flowing through reverse-blocking tetrode thyristor KbThe electric current of branch road.If magnetic latching relay switchs KcNot in current zero-crossing point break contact, easily damage Bad contact.The present embodiment is from by obtaining inductance LaThe electric current I of branch road1Correct time point during zero crossing, then allow controller to send Control signal come disconnect magnetic latching relay switch KcContact, allow magnetic latching relay switch KcClosed when electric current is less Close or disconnection action, thus easy burn-out magnetic latching relay does not switch KcOn contact, effectively extend magnetic keep relay Device switchs KcService life, and then also extend the service life of combination switch, simple structure, reliability is high.
Also including the accurate operating passing zero control method of combination switch, the accurate operating passing zero controlling party of the combination switch Method is as follows：
(1-1) combination switch is put into；
(1-1-1) when to put into combination switch to live wire C, voltage U on live wire C is first detectedCNDuring accurate during zero crossing Between point, as voltage UCNDuring zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbSend conductivity control signal, reverse-blocking tetrode thyristor KbWith Turn on；
(1-1-2) as reverse-blocking tetrode thyristor KbAfter conducting setting time, electric current I is first detected1Correct time point during zero crossing, As electric current I1During zero crossing, controller switchs K to magnetic latching relay immediatelycClosure control signal is sent, magnetic latching relay is opened Close KcClose immediately；
(1-1-3) electric current I and then is again detected1Correct time point during zero crossing, as electric current I1During zero crossing, controller Immediately to reverse-blocking tetrode thyristor KbSend shut-off control signal, reverse-blocking tetrode thyristor KbTurn off immediately, now only opened by magnetic latching relay Close KcCurrent supply circuit work is kept, combination switch devoting oneself to work to live wire C is so far completed；
(1-2) combination switch is cut off；
(1-2-1) when to cut off the combination switch on live wire C, electric current I is first detected1Correct time point during zero crossing, As electric current I1During zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbSend conductivity control signal, reverse-blocking tetrode thyristor KbLead immediately Logical, time delay makes for a period of time reverse-blocking tetrode thyristor KbReliable conducting；
(1-2-2) in reverse-blocking tetrode thyristor KbIn the case of conducting, electric current I is detected again1Correct time point during zero crossing, As electric current I1During zero crossing, controller switchs K to magnetic latching relay immediatelycDisconnection control signal is sent, magnetic latching relay is opened Close KcThen turn off；
(1-2-3) electric current I and then is again detected1Correct time point during zero crossing, as electric current I1During zero crossing, controller Immediately to reverse-blocking tetrode thyristor KbSend shut-off control signal, reverse-blocking tetrode thyristor KbTurn off immediately；So far combination switch is from live wire C On cut off completely.
The three-phase and four-line electric energy meter of the present embodiment is when the unbalanced power for occurring being connected in each phase of three-phase and four-line electric energy meter When can in time by be connected in the three-phase and four-line electric energy meter high power phase line a part load be switched to the three-phase and four-line electric energy In table low-power phase line, and the power supply phase line of each loading interfaces can any switching laws, switching electric current is little, will not burn out during switching Combination switch.The three-phase and four-line electric energy meter not only increases the motility of whole network load switching, also increases phase line switching Reliability, can greatly improve the stability and reliability of operation of power networks, simple structure, intelligence degree is high, good reliability.This Embodiment by obtaining current zero-crossing point, then sends control signal in switching combination switch, is opened or closed combination switch Contact, the little contact for being hardly damaged combination switch of switching electric current, effectively extends the life-span of combination switch.
The energization priority controlling organization of the present embodiment is first powered by controller, and controller just allows battery connection module after being powered The series-connected cell being sequentially connected in series in set of cells together is become into separate cell, priority control is then electrified to Mechanism just allows charger to be powered, and so can fully ensure that when charger is powered, and is separate between each cell , charging between each cell would not be impacted.
When charging, voltage checking chip can carry out voltage detecting to the present embodiment to corresponding cell.When certain list Body battery can reduce charging current when being full of by current limliting module, and when certain cell is not also far full of current limliting can be passed through Module increases charging current.So as to make voltage contained by cell identical as far as possible.When each cell is full of and each list Charge power supply can be disconnected when the voltage of body battery is identical.Or when each cell and underfill and each cell Voltage it is identical when can also disconnect charge power supply.After so allowing cell to be connected, will not between the cell being connected in series There is electric current flowing, the reliability of battery is high.The charging current or charging voltage of each charger can be differed each other.Pass through Switching switch selects different chargers can to certain cell.The cooperation of switching switch and current limliting module can be preferably to need The cell to be charged provides in real time charging current and charging voltage, consequently facilitating entering to the charging progress of each cell Row individually control, also allows for individually controlling the charging voltage of each cell.Examined by temperature in charging process Surveying mechanism can detect to the temperature of cell, and can carry out overheat protector control to cell when charging.Pass through Dual power supply mechanism makes the present embodiment have dual power supply function, substantially increases dependable with function.
The present embodiment can make the damage of single cell not interfere with other cells chargings, and not be set of cells Each separate cell in set of cells can be sequentially connected in series during charging and become together series-connected cell, for electricity The series-connected cell being sequentially connected in series in set of cells together can be become separate cell by pond group when charging, to every The charging process of individual cell can also carry out voltage detecting, and the charging progress of each cell individually can be controlled System, can also individually be controlled the charging voltage of each cell.And when charging excess temperature guarantor can be carried out to cell Shield control.Powered using dual power supply mechanism and realize the uninterrupted power supply of electrical equipment.It is safe, good reliability, and it is provided with logical Electric priority controlling organization in electric charging process in set of cells to first allowing the cell being connected in series to become independent cell After recharge, charging reliability is high.
The battery connection module of the present embodiment can be by each is separate in set of cells when can well allow set of cells to charge Cell be sequentially connected in series and become together series-connected cell, will can be sequentially connected in series in set of cells when charging for set of cells The series-connected cell for linking together becomes separate cell, and reliability is high.
The present embodiment can improve set of cells and can remain each separate list in set of cells in use Body battery is sequentially connected in series and become together series-connected cell, easily carries out charge and discharge to the set of cells from electricity consumption supply module automatically controlled System, reliability is high.
The embodiments of the present invention above in conjunction with Description of Drawings, but do not limited by above-described embodiment when realizing, this area Those of ordinary skill can within the scope of the appended claims make a variety of changes or change.

Claims (5)

1. there is the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, including three-phase and four-line electric energy meter body, three-phase and four-line electricity Energy table body includes A phase, B phase, C phase, zero line N and three-phase electric energy metering module (110), it is characterised in that also including node J1 With controller (107) and the three-phase equilibrium monitor (101) being connected with controller respectively, voltage sampling circuit (102), Single-Phase Inverter Source (103), isolating transformer (105), No. two voltage sampling circuits (108) and interface power monitor (109)； The power input connection of the power output end of Single-Phase Inverter Source and isolating transformer, node J1 respectively with isolating transformer The sampling end connection of power output end and No. two voltage sampling circuits, three-phase electric energy metering module is connected with controller；
Also include that the switch Ki that is connected with controller of control end, wherein i are positive integer, 1≤i≤42；
Also include node J18, node J14 and node J6, the zero line of node J18 is connected with A, the zero line and B of node J14 It is connected, the zero line of node J6 is connected with C；The zero line of the zero line side, the zero line side of node J14 and node J6 of node J18 End is all connected with zero line N respectively；
The electric energy metrical end of three-phase electric energy metering module, the monitoring side of three-phase equilibrium monitor and voltage sampling circuit are adopted Sample end is all connected with node J18, node J14 and node J6 respectively；
The power input of Single-Phase Inverter Source is connected by switch K40 with node J18, the power input of Single-Phase Inverter Source It is connected with node J14 by switching K41, the power input of Single-Phase Inverter Source is connected by switch K42 with node J6；
Also include that a loading interfaces (201) being connected with the monitoring side of the interface power monitor respectively, No. two loads connect Mouth (202), No. three loading interfaces (203), No. four loading interfaces (204), No. five loading interfaces (205) and No. six loading interfaces (206)；
Also include node J2, node J3, node J4, node J5, node J7, node J8, node J9, node J10, node J11, section Point J12, node J13, node J15, node J16, node J17 and node J19；
The node J6, switch K13, node J2, switch K14, node J3, switch K15, node J4, switch K16, node J5 and No. six loading interfaces are sequentially connected in series, the node J6, switch K21, node J7, switch K22, node J8, switch K23, section Point J9, switch K24, node J10 and No. five loading interfaces are sequentially connected in series, and the node J14, switch K29, node J11, open Close K30, node J12, switch K31, node J13 and No. four loading interfaces to be sequentially connected in series, the node J14, switch K34, Node J15, switch K35, node J16 and No. three loading interfaces are sequentially connected in series, the node J18, switch K38, node J17 It is sequentially connected in series with No. two loading interfaces, the node J18, switch K39, node J19 and a loading interfaces are sequentially connected in series Connection；
The node J1, switch K1, node J2, switch K17 and node J19 be sequentially connected in series, the node J1, switch K2, Node J7, switch K25 and node J19 are sequentially connected in series, the node J1, switch K3, node J11, switch K32 and node J19 is sequentially connected in series, and the node J1, switch K4, node J15, switch K36 and node J19 are sequentially connected in series, the section Point J1, switch K5, node J3, switch K18 and node J17 are sequentially connected in series, the node J1, switch K6, node J8, switch K26 and node J17 are sequentially connected in series, and the node J1, switch K7, node J12, switch K33 and node J17 are sequentially connected in series company Connect, the node J1, switch K8, node J16, switch K37 and node J17 be sequentially connected in series, the node J1, switch K9, Node J4, switch K19 and node J16 are sequentially connected in series, the node J1, switch K10, node J9, switch K27 and node J16 is sequentially connected in series, and the node J1, switch K11, node J5, switch K20 and node J13 are sequentially connected in series, the section Point J1, switch K12, node J10, switch K28 and node J13 are sequentially connected in series；
The switch K40, switch K41 and pass K42 are the identical combination switch of circuit structure；The combination switch includes Number node (701), No. two nodes (702), a switching switch Ka, node Ma, inductance La, node Mb, electric capacity Ca, diode D1, two Pole pipe D2, diode D3, diode D4, electric capacity C0, photoelectrical coupler OPT, resistance R0, from electricity consumption supply module (901), Magnetic driving Electric power road (502) and silicon drive circuit (503), switching switch KaIncluding reverse-blocking tetrode thyristor KbK is switched with magnetic latching relayc, institute Photoelectrical coupler OPT is stated including light emitting diode D5With phototriode Q0；The reverse-blocking tetrode thyristor KbOne end and magnetic keep after Electric switch KcOne end be connected on a node (701), a node (701) is only in discontinuity surface when same Can be connected in the wherein phase in A phases, B phases and C phases this three-phases；The reverse-blocking tetrode thyristor KbThe other end, magnetic keep relay Device switchs KcThe other end, inductance LaOne end, diode D1Positive terminal and diode D3Negative pole end be all connected to node Ma On, the inductance LaThe other end, one end of electric capacity Ca and electric capacity C0One end be all connected to node MbOn, the electric capacity Ca's The other end is connected on No. two nodes (702), and No. two nodes (702) are connected on zero line N, the diode D2Positive pole End and diode D4Negative pole end be all connected to electric capacity C0The other end on, diode D1Negative pole end and diode D2Negative pole End is all connected to light emitting diode D5Positive terminal on, diode D3Positive terminal and diode D4Positive terminal be all connected to send out Optical diode D5Negative pole end on, the phototriode Q0Grounded emitter, the phototriode Q0Colelctor electrode difference With resistance R0One end and controller connection, resistance R0The other end be connected from electricity consumption supply module, the silicon drive circuit point Not with reverse-blocking tetrode thyristor KbControl end and controller connection, the Magnetic driving circuit respectively with magnetic latching relay switch Kc's Control end and controller connect；
From electricity consumption supply module include battery connection module, can be sequentially connected in series by several separate cells and Into set of cells；Also include charger equal with cell number respectively, switching switch and current limliting from electricity consumption supply module Module；Battery connection module includes the bulk charging bindiny mechanism equal with cell number；In each bulk charging bindiny mechanism On be respectively equipped with bulk voltage detection chip；One-to-one each the switching switch that is connected to of the power output end of each charger selects end A terminals on；The turning end of each switching switch is one-to-one to be connected on one end of current limliting module, each current limliting module The other end one-to-one be connected in the bulk charging bindiny mechanism of battery connection module；Battery connection module is connected to set of cells On, the control end of the battery connection module, each bulk voltage detection chip, the control end of each current limliting module and each switching The control end of switch is connected respectively with controller；And under the control of the controller, when not charging for set of cells, battery connection mode Each separate cell in set of cells can be sequentially connected in series and become together series-connected cell by block, when for set of cells During charging, the series-connected cell being sequentially connected in series in set of cells together can be become separate monomer by battery connection module Battery；
The power input of each charger and the power input of controller are conductively connected in an energization priority control machine On structure, and energization priority controlling organization is first powered to controller when upper electric, and charger energization is then given again；Lead to when lower electric Electric priority controlling organization first allows charger power-off, then allows controller power-off again.
2. it is according to claim 1 with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, it is characterised in that also to wrap Include the memorizer (106) being connected with controller.
3. it is according to claim 1 with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, it is characterised in that also to wrap Filter (104) is included, filter is connected in series in the power output end of Single-Phase Inverter Source and the power input of isolating transformer On line between end.
4. it is according to claim 1 with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, it is characterised in that isolation The no-load voltage ratio of transformator is more than 1.17.
5. it is according to claim 1 with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, it is characterised in that also to wrap The accurate operating passing zero control method of combination switch is included, the accurate operating passing zero control method of the combination switch is as follows：
(1-1) combination switch is put into；
(1-1-1) when to put into combination switch to live wire C, voltage U on live wire C is first detectedCNCorrect time point during zero crossing, As voltage UCNDuring zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbSend conductivity control signal, reverse-blocking tetrode thyristor KbLead immediately It is logical；
(1-1-2) as reverse-blocking tetrode thyristor KbAfter conducting setting time, electric current I is first detected1Correct time point during zero crossing, works as electricity Stream I1During zero crossing, controller switchs K to magnetic latching relay immediatelycSend closure control signal, magnetic latching relay switch Kc Close immediately；
(1-1-3) electric current I and then is again detected1Correct time point during zero crossing, as electric current I1During zero crossing, controller is immediately To reverse-blocking tetrode thyristor KbSend shut-off control signal, reverse-blocking tetrode thyristor KbTurn off immediately, now only K is switched by magnetic latching relayc Current supply circuit work is kept, combination switch devoting oneself to work to live wire C is so far completed；
(1-2) combination switch is cut off；
(1-2-1) when to cut off the combination switch on live wire C, electric current I is first detected1Correct time point during zero crossing, works as electric current I1During zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbSend conductivity control signal, reverse-blocking tetrode thyristor KbTurn on immediately, time delay A period of time makes reverse-blocking tetrode thyristor KbReliable conducting；
(1-2-2) in reverse-blocking tetrode thyristor KbIn the case of conducting, electric current I is detected again1Correct time point during zero crossing, works as electricity Stream I1During zero crossing, controller switchs K to magnetic latching relay immediatelycSend disconnection control signal, magnetic latching relay switch Kc Then turn off；
(1-2-3) electric current I and then is again detected1Correct time point during zero crossing, as electric current I1During zero crossing, controller is immediately To reverse-blocking tetrode thyristor KbSend shut-off control signal, reverse-blocking tetrode thyristor KbTurn off immediately；So far combination switch is complete from live wire C Full excision.
CN201710029829.8A 2017-01-12 2017-01-12 With the accurate three-phase and four-line electric energy meter for crossing zero phase line switching Expired - Fee Related CN106680550B (en)

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Citations (5)

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Publication number Priority date Publication date Assignee Title
CN102761173A (en) * 2012-06-15 2012-10-31 王成楷 Intelligent electric meter with functions of leakage remote monitoring and protection
CN204992521U (en) * 2015-09-10 2016-01-20 威胜集团有限公司 Electric energy meter that single -phase electric energy meter operated a switch control circuit and made with this circuit
CN205353197U (en) * 2015-12-25 2016-06-29 威胜集团有限公司 Intelligence single -phase electric energy meter
CN205829128U (en) * 2016-06-01 2016-12-21 杭州华泰电气技术有限公司 Electric energy meter Based Intelligent Control protection module
EP3106885A1 (en) * 2015-06-17 2016-12-21 Mitsubishi Heavy Industries, Ltd. Ero crossing point detecting device, power supply device, and zero crossing point detecting method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102761173A (en) * 2012-06-15 2012-10-31 王成楷 Intelligent electric meter with functions of leakage remote monitoring and protection
EP3106885A1 (en) * 2015-06-17 2016-12-21 Mitsubishi Heavy Industries, Ltd. Ero crossing point detecting device, power supply device, and zero crossing point detecting method
CN204992521U (en) * 2015-09-10 2016-01-20 威胜集团有限公司 Electric energy meter that single -phase electric energy meter operated a switch control circuit and made with this circuit
CN205353197U (en) * 2015-12-25 2016-06-29 威胜集团有限公司 Intelligence single -phase electric energy meter
CN205829128U (en) * 2016-06-01 2016-12-21 杭州华泰电气技术有限公司 Electric energy meter Based Intelligent Control protection module

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