CN106646214B - Three-phase and four-line electric energy meter and operating passing zero control and itself switching fault judgment method - Google Patents
Three-phase and four-line electric energy meter and operating passing zero control and itself switching fault judgment method Download PDFInfo
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- CN106646214B CN106646214B CN201710029779.3A CN201710029779A CN106646214B CN 106646214 B CN106646214 B CN 106646214B CN 201710029779 A CN201710029779 A CN 201710029779A CN 106646214 B CN106646214 B CN 106646214B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses three-phase and four-line electric energy meter and operating passing zero control and itself switching fault judgment methods.It is related to electric energy meter technical field, which can in time be switched to a part load being connected in the three-phase and four-line electric energy meter high power phase line in the three-phase and four-line electric energy meter low-power phase line when the unbalanced power for occurring being connected in each phase of three-phase and four-line electric energy meter.Including three-phase and four-line electric energy meter ontology, three-phase and four-line electric energy meter ontology includes A phase, B phase, C phase, zero curve N and three-phase electric energy metering module, further includes node J1 and controller and difference three-phase equilibrium monitor, No.1 voltage sampling circuit, Single-Phase Inverter Source, isolating transformer, No. two voltage sampling circuits and interface power monitor connected to the controller;The power output end of Single-Phase Inverter Source is connected with the power input of isolating transformer, and node J1 is connect with the sampling end of the power output end of isolating transformer and No. two voltage sampling circuits respectively, and three-phase electric energy metering module is connect with controller.
Description
Technical field
The present invention relates to electric energy meter technical fields, and in particular to three-phase and four-line electric energy meter and operating passing zero control are thrown with itself
Cut fault judgment method.
Background technique
With the development of economy and society, the type of electrical equipment is more and more.Since current power supply system is typically all
Three-phase power supply system if the power on three-phase occurs biggish asymmetric, just will appear power grid in three-phase power supply system
Off-center operation, just will appear power grid shake.
When operation of power networks is in non-equilibrium state, the transformer in power grid is at asymmetric operation state, in not right
Claiming the transformer of operating status can make the zero-sequence current of transformer excessive, and excessive zero-sequence current can make the local part of transformer
Temperature increases, if the local Part temperature of transformer increase it is excessive may can burn transformer, to cause power supply system
Power outage.
When unbalanced power supply operation, if to allow the power grid of off-center operation to become the power grid of balance movement, at present
The method taken is will be big to another positioned at a part load manual switching in the high power phase line of an a wide range of section
In the low-power phase line of range section.Since the load that this switching mode switches in moment is more, lead to rushing for moment switching
Hit that electric current is excessive, excessive dash current can not only burn out switching equipment, due also to load switching at that moment, the load
The power supply phase line difference of switching front and back will lead to the loaded work piece and occur chaotic or even damage.
It due to specifically loading is used by some particular user, all electricity consumptions of each particular user will use electric energy
Table carries out electrical energy measurement, therefore, if the basic phase line switching list that all loads that can be connected using electric energy meter switch as phase line
Member, then it is ensured that entire as long as the power in the basic phase line switch unit of each of entire power grid is in a basic balance
The power of power grid be also it is in a basic balance, will power grid be in balance movement state.
The basic phase line switch unit that all loads connected using electric energy meter switch as phase line, this not only adds power grids
The flexibility of phase line switching, due to the load that is connected on an electric energy meter for an a wide range of section much less, this
Kind phase line switches generated dash current and also wants considerably less.Therefore, if the electric energy can will be connected in time by electric energy meter
A part load in table high power phase line is switched in the electric energy meter low-power phase line, and it is negative which not only adds entire power grids
The flexibility for carrying switching also increases the reliability of phase line switching, substantially increases the stability of operation of power networks.Therefore, it designs
It is a kind of can according to be connected to that the unbalanced power loaded in each phase line of three-phase and four-line electric energy meter realizes automatically will be in high power phase line
A part load be switched in low-power phase line, make the three-phase four of the power-balance in each phase line of three-phase and four-line electric energy meter as far as possible
Line electric energy meter is very necessary.
Summary of the invention
The present invention is to cause to occur being connected to three-phase to solve existing three-phase and four-line electric energy meter and do not have phase line handoff functionality
One for cannot being connected in the three-phase and four-line electric energy meter high power phase line when unbalanced power in four each phases of line electric energy meter
Point deficiency that is switched in the three-phase and four-line electric energy meter low-power phase line of load provides a kind of when occurring being connected to three-phase and four-line electricity
The a part being connected in the three-phase and four-line electric energy meter high power phase line can be born in time when unbalanced power in each phase of table
Load is switched in the three-phase and four-line electric energy meter low-power phase line, can autonomous detection combination switch itself switching failure,
Correct time point when AC current zero crossing can be accurately detected again, moreover it is possible to which the correct time point in current zero-crossing point carries out
Switching, structure is simple, and intelligence degree is high, and the three-phase and four-line of charge and discharge control is easily carried out to the battery pack from electricity consumption power supply module
Electric energy meter and operating passing zero control and itself switching fault judgment method.
To achieve the goals above, the invention adopts the following technical scheme:
Three-phase and four-line electric energy meter, including three-phase and four-line electric energy meter ontology, three-phase and four-line electric energy meter ontology include A phase, B phase, C
Phase, zero curve N and three-phase electric energy metering module further include node J1 and controller and three-phase equilibrium connected to the controller respectively
Monitor, No.1 voltage sampling circuit, Single-Phase Inverter Source, isolating transformer, No. two voltage sampling circuits and interface power prison
Survey device.The power output end of Single-Phase Inverter Source is connected with the power input of isolating transformer, node J1 respectively be isolated become
The connection of the sampling end of the power output end of depressor and No. two voltage sampling circuits, three-phase electric energy metering module are connect with controller.
It further include control terminal switch Ki connected to the controller, wherein i is positive integer, 13≤i≤48.
It further include node J18, node J14 and node J6, the zero line of node J18 is connected with A, the firewire 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
Zero line side is all connect with zero curve N respectively.
The electrical energy measurement end of three-phase electric energy metering module, the monitoring side of three-phase equilibrium monitor and No.1 voltage sampling circuit
Sampling end all connect respectively with node J18, node J14 and node J6.
The power input of Single-Phase Inverter Source is connect by switch K40 with node J18, and the power supply of Single-Phase Inverter Source is defeated
Enter end to connect by switch K41 with node J14, the power input of Single-Phase Inverter Source is connect by switch K42 with node J6.
It further include that the No.1 loading interfaces connecting respectively with the monitoring side of the interface power monitor, No. two loads connect
Mouth, No. three loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces.
It further 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.
The node J6, switch K13, node J2, switch K14, node J3, switch K15, node J4, switch K16, node
J5 and No. six loading interfaces is sequentially connected in series, the 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, the node J14, switch K29, node
J11, switch K30, node J12, switch K31, node J13 and No. four loading interfaces are sequentially connected in series, and the node J14, are opened
Close K34, node J15, switch K35, node J16 and No. three loading interfaces are sequentially connected in series, the node J18, switch K38,
Node J17 and No. two loading interfaces are sequentially connected in series, the node J18, switch K39, node J19 and No.1 loading interfaces according to
Secondary series connection.
The node J2, switch K17 and node J19 are sequentially connected in series, the node J7, switch K25 and node J19 according to
Secondary series connection, the node J11, switch K32 and node J19 are sequentially connected in series, the node J15, switch K36 and node
J19 is sequentially connected in series, and the node J3, switch K18 and node J17 are sequentially connected in series, the node J8, switch K26 and
Node J17 is sequentially connected in series, and the node J12, switch K33 and node J17 are sequentially connected in series, the node J16, switch
K37 and node J17 are sequentially connected in series, and the node J4, switch K19 and node J16 are sequentially connected in series, the node J9,
Switch K27 and node J16 are sequentially connected in series, and the node J5, switch K20 and node J13 are sequentially connected in series, the node
J10, switch K28 and node J13 are sequentially connected in series.
The node J1, switch K43 and node J19 are sequentially connected in series, the node J1, switch K44 and node J17 according to
Secondary series connection, the node J1, switch K45 and node J16 are sequentially connected in series, the node J1, switch K46 and node
J13 is sequentially connected in series, and the node J1, switch K47 and node J10 are sequentially connected in series.The node J1, switch K48 and
Node J5 is sequentially connected in series.
The switch K40, switch K41 and switch K42 are the identical combination switch of circuit structure;It is described compound to open
Close include No.1 node, No. two nodes, No.1 switch, No. two switch, No. three switch, No. four switch, No. five switch, No. six open
It closes, node Ma, node Mb, node Mc, node Md, node Me, inductance La, capacitor Ca, capacitor C0, capacitor C2, diode D1, two poles
Pipe D2, diode D3, diode D4, photoelectrical coupler OPT, resistance R0, resistance R1, resistance R2, switching switch Ka, Magnetic driving electricity
Road, silicon driving circuit, from electricity consumption power supply module and ground terminal SGND, the controller includes pulse counter;The switching
Switch KaIncluding reverse-blocking tetrode thyristor KbWith magnetic latching relay switch Kc, the photoelectrical coupler OPT includes light emitting diode D5With
Phototriode Q0;The reverse-blocking tetrode thyristor KbOne end and magnetic latching relay switch KcOne end respectively with No.1 node connect
It connects, the reverse-blocking tetrode thyristor KbThe other end, No.1 switch one end, No. three switch one end, No. four switch one end and electricity
Feel LaOne end respectively with node MaConnection, the inductance LaThe other end, capacitor CaOne end, No. two switch one end, No. five
One end of switch and No. six switch one end respectively with node MbConnection, magnetic latching relay switch KcThe other end, No.1 switch
The other end and No. two switch the other ends respectively with node McConnection, the capacitor C2One end, No. four switch the other ends,
Diode D1Positive terminal and diode D3Negative pole end respectively with node MdConnection, the diode D2Positive terminal, diode
D4Negative pole end, capacitor C0One end and resistance R2One end respectively with node MeConnection, the other end and electricity of No. three switches
Hinder R1One end connection, the resistance R1The other end and capacitor C2The other end connection, No. five switch the other ends and capacitor C0
The other end connection, No. six switch the other ends and resistance R2The other end connection, the capacitor CaThe other end be connected to No. two
On node, the diode D1Negative pole end and diode D2Negative pole end be connected to light emitting diode D5Positive terminal on,
The diode D3Positive terminal and diode D4Positive terminal be connected to light emitting diode D5Negative pole end on, the light
Quick triode Q0Collector terminal respectively with resistance R0One end connected with controller, the phototriode Q0Emitter with
The SGND connection of signal ground end, it is described from electricity consumption power supply module respectively with resistance R0The other end, Magnetic driving circuit, silicon driving electricity
Road is connected with controller, the silicon driving circuit respectively with reverse-blocking tetrode thyristor KbControl terminal connected with controller, the magnetic drives
Dynamic circuit respectively with magnetic latching relay switch KcControl terminal connected with controller.The No.1 section in discontinuity surface when same
Point can only be connected in the wherein phase in A phase, B phase and C phase this three-phase;No. two nodes are connected on zero curve N.
Include battery connection module, company can be sequentially connected in series by several mutually independent single batteries from electricity consumption power supply module
Battery pack made of connecing;From electricity consumption power supply module further include charger equal with single battery number respectively, switching switch and
Current limliting module;Battery connection module includes the bulk charging bindiny mechanism equal with single battery number;It is connected in each bulk charging
Bulk voltage detection chip is respectively equipped in mechanism;The power output end of each charger is one-to-one to be connected to each switching switch choosing
It selects on a terminals at end;On one-to-one one end for being connected to current limliting module of turning end of each switching switch, each current limliting
In the one-to-one bulk charging bindiny mechanism for being connected to battery connection module of the other end of module;Battery connection module is connected to battery
In group, the control terminal of the battery connection module, each bulk voltage detection chip, the control terminal of each current limliting module and each cut
The control terminal for changing switch is connect with controller respectively;And under the control of the controller, when not being battery pack charging, battery connection
Mutually independent single battery each in battery pack can be sequentially connected in series by module becomes series-connected cell together, when for battery
When group charging, the series-connected cell for being sequentially connected in series together in battery pack can be become mutually independent list by battery connection module
Body battery;
The power input of each charger and the power input of controller are conductively connected the successively control that is powered at one
In mechanism processed, and the successive control mechanism that is powered when powering on first is powered to controller, then gives charger to be powered again;In lower electricity
The successive control mechanism of Shi Tong electricity first allows charger to power off, and then allows controller to power off again.
The successive control mechanism of the energization of this programme is first powered by controller, and controller just allows battery connection module will after being powered
The series-connected cell being sequentially connected in series in battery pack together becomes mutually independent single battery, is then electrified to successive control machine
Structure just allows charger to be powered, and can be fully ensured that in this way when charger is powered, is independent from each other between each single battery,
Charging would not be impacted between each single battery, thus easily automatically controlled to charge and discharge is carried out from the battery pack of electricity consumption power supply module
System.
This programme is when in use, it is assumed that under normal circumstances, No.1 loading interfaces with No. two loading interfaces are supplied by A phase
Electricity, No. three loading interfaces with No. four loading interfaces are powered by B phase, 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 phase of three-phase and four-line electric energy meter, B phase and C phase
Power-balance monitoring is carried out, and the data of monitoring are uploaded to controller, what controller immediately uploaded three-phase equilibrium monitor
Data carry out calculation processing.If occurring any two-phase function after the data calculation processing that controller uploads three-phase equilibrium monitor
When the difference of rate is greater than the set value, then the maximum phase line of current power is found out, if the maximum phase line of current power is A phase.
Then controller just gives one work order of interface power monitor immediately, and interface power monitor is immediately to No.1
Loading interfaces, No. two loading interfaces, No. three loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces into
Row power monitoring, and monitoring result is uploaded into controller, controller is stood after receiving the data transmitted in one to No. five loading interfaces
Carry out calculation processing.If obtaining being added to the load in No.1 loading interfaces in No. six loading interfaces or being added to after calculating
It is that each phase power of power grid can most be allowed to keep balance in No. six loading interfaces, then under the control of the controller just loading No.1
The power supply of interface is switched to C phase from A phase.
The handoff procedure that the power supply of No.1 loading interfaces is switched to C phase from A phase is as follows:
First, it is assumed that before the handover, switch K17, switch K18, switch K19, switch K20, switch K25, switch K26, opening
Close K27, switch K28, switch K32, switch K33, switch K36, switch K37, switch K40, switch K41, switch K42, switch
Switch K13, K43, switch K44, switch K45, switch K46, switch K47 and switch K48 switch K14, are opened all in off-state
Close K15, switch K16, 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 closed state.
Then, A is connected by the switch of No.1 voltage sampling circuit, and No.1 voltage sampling circuit acquires the voltage letter of A phase
Number and be uploaded to controller.
Then, switch K42 closure connects C phase and Single-Phase Inverter Source, and the voltage signal of Single-Phase Inverter Source output is with A phase
Voltage signal as reference, using Single-Phase Inverter Source export voltage signal be used as feedback signal, composition closed-loop control, controlling
In device processed generate SPWM driving signal, make Single-Phase Inverter Source export voltage waveform through isolating transformer export it is stable just
String wave power supply.When the sine-wave power of isolating transformer output and A phase voltage are with amplitude same-phase, it is closed at switch K43
With disconnection switch K39, the power supply state in No.1 loading interfaces is still identical with the power supply status in A phase at this time.
Then, controller use phase shifting control, make Single-Phase Inverter Source export voltage waveform after filter filtering again
Stable sine-wave power is exported through isolating transformer.When the sine-wave power and the same amplitude of C phase voltage of isolating transformer output
When same-phase, and switch K43 and closure switch K17 are simultaneously switched off, the power supply state in No.1 loading interfaces is with regard to complete at this time
Complete identical with the power supply status in C phase, i.e., the power supply of No.1 loading interfaces has been switched to C phase from A phase at this time.
Finally switch K42 is disconnected, Single-Phase Inverter Source is bypassed and exits, so far a Phase-switching operation terminates.
Other loading interfaces switching principles are identical.
The three-phase and four-line electric energy meter system of this programme is uneven when the power for occurring being connected in each phase of three-phase and four-line electric energy meter
A part load being connected in the three-phase and four-line electric energy meter high power phase line can be switched to three-phase and four-line electricity in time when weighing apparatus
Can be in table low-power phase line, which not only adds the flexibility of entire network load switching, also increase phase line switching can
By property, the stability and reliability of operation of power networks can be greatly improved, intelligence degree is high, good reliability.
The combination switch of this programme in use, when simultaneously switch off No.1 switch, disconnect No. four switch, disconnect No. five
When switch, No. two switches of closure, No. three switches of closure and No. six switches of closure, the combination switch of this programme just becomes one at this time
The fault self-checking that itself switching failure can be detected switchs;When be closed at No.1 switch, closure No. four switch, closure No. five
When switching, disconnecting No. two switches, disconnect No. six switches of No. three switches and disconnection, the combination switch of this programme just becomes one at this time
Correct time point when can accurately detect AC current zero crossing and the correct time point in current zero-crossing point carry out
The zero crossing fling-cut switch of switching.
One, when using the combination switch of this programme as zero crossing fling-cut switch in use, the principle is as follows:
Firstly, it is necessary to simultaneously switch off No.1 switch, disconnect No. four switches, disconnect No. five switches, No. two switches of closure, closure
No. six switches of No. three switches and closure.At this point, in the combination switch of this programme, inductance LaUsing high-frequency inductor, inductance LaElectricity
Sense is tens microhenrys.As reverse-blocking tetrode thyristor KbOr magnetic latching relay switch KcMoment is connected, the impedance of capacitor Ca is about 0, and by
In inductance LaPresence, inductance LaIn conducting moment, frequency changes very greatly, inductance LaImpedance it is also very big, it is suppressed that power supply is led
The dash current of logical moment;When circuit works normally, since supply frequency is 50HzPower frequency, then inductance LaImpedance very little.
In inductance LaIn, inductance LaVoltage ULaAdvanced inductance LaElectric current I190 degree, i.e. inductance LaElectric current I1Fall behind electricity
Feel LaVoltage ULa90 degree.
In capacitor C0In, capacitor C0Electric current I2Advanced capacitor C0Voltage UC090 degree, i.e. capacitor C0Voltage UC0Fall behind electricity
Hold C0Electric current I290 degree.
Electric current I1Pass through inductance La, capacitor Ca formed closed circuit, then have inductance LaOn voltage ULaAdvanced inductance LaOn
Electric current I190 degree.
As inductance LaVoltage ULaIn node M sometimeaPoint be positive, node MbPoint is when being negative, then electric current I2From node
MaPoint passes through diode D1, light emitting diode D5, diode D4With capacitor C0Form branch.
Ignore diode D1, light emitting diode D5With diode D4Pressure drop, it is clear that have i.e. ULa=UC0, i.e. inductance LaElectricity
Press ULaEqual to capacitor C0Voltage UC0.Obviously there is inductance LaOn voltage ULaLag capacitor C0On electric current I290 degree, to have
Capacitor C0On electric current I2With inductance LaOn electric current I1It is reversed each other, i.e. electric current I2With electric current I1It is reversed each other.UCNIt is in C phase
Voltage.
As electric current I2It is positive and be greater than light emitting diode D5When luminous minimum current, the output signal U of photoelectrical couplerI0
Become low level from high level, reasonably selects capacitor C0, make capacitor C0On electric current I2Positive zero crossing and hair can be rapidly achieved
Optical diode D5Luminous minimum current.
As electric current I2After positive zero crossing, the output signal U of photoelectrical couplerI0Become low level from high level, due to
Electric current I2With electric current I1Reversely, then there is the output signal U when photoelectrical couplerI0When becoming high level from low level, electric current I1Just
In positive zero crossing.Therefore the output signal U of photoelectrical couplerI0When becoming 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 give magnetic latching relay switch K immediatelycHair
Signal is opened or closed out.Allow magnetic latching relay switch K if necessarycIt disconnects, then controller is just opened to magnetic latching relay
Close KcIt issues and disconnects control signal, magnetic latching relay switch KcIt then turns off;Allow magnetic latching relay switch K if necessarycIt closes
It closes, then controller just gives magnetic latching relay switch KcIssue closure control signal, magnetic latching relay switch KcIt is closed immediately.
This programme switchs magnetic latching relay further according to the correct time point from by obtaining correct time point when current zero-crossing point
KcThe control signal that is opened or closed is issued to make magnetic latching relay switch KcContact be opened or closed, then flow through magnetic guarantor
Hold relay switch KcElectric current it is small, magnetic latching relay switch K is opened or closed in low currentc, so that magnetic latching relay
Switch KcContact be hardly damaged.To effectively extend magnetic latching relay switch KcService life, and then extend compound open
The service life of pass.
When putting into combination switch, because of reverse-blocking tetrode thyristor KbThe moment of conducting, due to inductance LaElectric current inhibiting effect,
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 smaller, is closed magnetic latching relay switch K at this timec, to magnetic latching relay
Switch KcContact damage very little, thus effectively extend control transwitch KbService life, and then extend the use of combination switch
Service life.
This programme is in reverse-blocking tetrode thyristor KbIt is on and magnetic latching relay switch KcWhen in closure, if to turn off
Reverse-blocking tetrode thyristor Kb, then in electric current I1Zero crossing Shi Cairang reverse-blocking tetrode thyristor KbIt disconnects, it in this way being capable of effective protection reverse-blocking tetrode thyristor
KbService life.
This programme is only in the reverse-blocking tetrode thyristor K that put into combination switch to C phasebWhen throw when just using voltage over zero
Enter, as long as all being put into or being cut off using current over-zero in the case where having electric current on combination switch, substantially increases compound
The service life of switch, reliability is higher, and safety is preferable.
In the present solution, working as reverse-blocking tetrode thyristor KbWhen conducting, in magnetic latching relay switch KcThere are no in the case where disconnection,
Magnetic latching relay switch K at this timecIt is also conducting, i.e. reverse-blocking tetrode thyristor KbWith magnetic latching relay switch KcSimultaneously at this time
It is in the conductive state.Due to reverse-blocking tetrode thyristor KbBranch has inductance LaConducting resistance, it is clear that magnetic latching relay switch KcBranch
The impedance on road will be far smaller than reverse-blocking tetrode thyristor KbThe impedance of branch, therefore flow through magnetic latching relay switch KcElectric current be greater than
Flow through reverse-blocking tetrode thyristor KbThe electric current of branch.If magnetic latching relay switch KcNot in current zero-crossing point break contact, easily damage
Contact.This programme is from by obtaining inductance LaThe electric current I of branch1Correct time point when zero crossing, then controller is allowed to issue control
Signal disconnects magnetic latching relay switch KcContact, allow magnetic latching relay switch KcCarried out when electric current is smaller closure or
Disconnection movement, thus not easy burn-out magnetic latching relay switch KcOn contact, effectively extend magnetic latching relay and open
Close KcService life, and then also extend the service life of combination switch, structure is simple, high reliablity.
Two, it switchs when using the combination switch of this programme as fault self-checking in use, the principle is as follows:
Firstly, it is necessary to simultaneously switch off No.1 switch, disconnect No. four switches, disconnect No. five switches, No. two switches of closure, closure
The combination switch of this programme, has thus been become fault self-checking switch by No. six switches of No. three switches and closure.
When needing switching combination switch, controller is to reverse-blocking tetrode thyristor KbConductivity control signal is issued, silicon-controlled open is made
Close KbConducting.Electric current is through reverse-blocking tetrode thyristor Kb, inductance LaWith capacitor CaClosed circuit is formed, inductance L is connected in parallel onaThe capacitor at both ends
C2, diode D1, diode D2, diode D3, diode D4, photoelectrical coupler 0PT, resistance R1, resistance R0, resistance R2, from electricity consumption
Power supply module and ground terminal SGND together form reverse-blocking tetrode thyristor KbOperation detecting circuit.Reverse-blocking tetrode thyristor is flowed through in electric current
KbWhen reverse-blocking tetrode thyristor KbOperation detecting circuit can generate start pulse signal, keep after a certain period of time, controller is protected to magnetic
Hold relay switch KcClosure control signal is issued, magnetic latching relay switch K is madecClosure.Magnetic latching relay switch KcClosure
Afterwards by reverse-blocking tetrode thyristor KbWith inductance LaThe series arm of composition is short-circuit, at this time reverse-blocking tetrode thyristor KbOperation detecting circuit will not
Trigger pulse can be generated.Then, controller is to reverse-blocking tetrode thyristor KbIt issues and disconnects control signal, make reverse-blocking tetrode thyristor KbIt disconnects, by
Magnetic latching relay switch KcKeep current supply circuit work.
When needing to cut off combination switch, controller is to reverse-blocking tetrode thyristor KbConductivity control signal is issued, silicon-controlled open is made
Close KbConducting is kept after a certain period of time, and controller is to magnetic latching relay switch KcIt issues and disconnects control signal, magnetic keeps relay
Device switch KcIt then turns off, at this point, silicon-controlled operation detecting circuit will have trigger pulse appearance.Finally, controller is to silicon-controlled
Switch KbIt issues again and disconnects control signal, reverse-blocking tetrode thyristor KbIt then turns off.So far combination switch has just been cut off completely.
The combination switch of this programme has can be carried out self fault detection during switch motion, and without compound
In addition setting detects the instrument of failure in switch, to keep the structure of combination switch simpler, small in size, structure is reliable, at
This is cheap, reduces switching unsuccessful security risk when combination switch uses.
The combination switch of this programme can detect itself switching failure and accurately detect AC current zero crossing respectively
When correct time point and voltage over zero when correct time point, can not only be protected respectively in the case where combination switch has electric current
Demonstrate,prove reverse-blocking tetrode thyristor KbWith magnetic latching relay switch KcCorrect time point in current zero-crossing point carries out switching, moreover it is possible to multiple
Combination switch does not have to guarantee reverse-blocking tetrode thyristor K in the case where electric currentbCorrect time point in voltage over zero carries out switching, switching
Electric current is small, and when switching will not burn out the contact of switch, and structure is simple, high reliablity, and safety is good, can greatly prolong combination switch
Service life.The combination switch of this programme can be carried out the intellectualized detection of combination switch itself switching failure, can allow use in time
Family knows whether combination switch failure occurs, and convenient for replacement in time, structure is simple, high reliablity, and safety is good.
Preferably, further including memory connected to the controller.Memory is convenient for the letter of storage three-phase and four-line electric energy meter
Breath, it is simple and easy to use.
Preferably, further including filter, filter is connected in series in power output end and the isolation of Single-Phase Inverter Source
On line between the power input of transformer.Filter improves the reliability of isolating transformer input, so that every
Reliability from transformer output is higher.
Preferably, the no-load voltage ratio of isolating transformer is greater than 1.17.Due to the width of the sinusoidal voltage of Single-Phase Inverter Source output
Maximum 0.85 times for there was only input voltage of value, therefore isolating transformer is connected in the back of filter, no-load voltage ratio is greater than 1.17, so that
The output voltage amplitude of switching system reaches 220V, improves the practicability and reliability of system.
Preferably, further including display connected to the controller.Display is simple and easy to use convenient for user's observation.
Preferably, further including alarm connected to the controller.It is controlled after the failure of combination switch itself switching
Device issues alarm command to alarm, and alarm issues alarm sound immediately, replaces combination switch in time convenient for user.
A kind of operating passing zero control method suitable for three-phase and four-line electric energy meter, is opened when the compound of three-phase and four-line electric energy meter
It closes as zero crossing fling-cut switch in use, the operating passing zero control method of the combination switch is as follows:
(1-1) puts into combination switch;
(1-1-1) first detects voltage U in C phase when to put into combination switch to C phaseCNCorrect time point when zero crossing,
As voltage UCNWhen zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbIssue conductivity control signal, reverse-blocking tetrode thyristor KbIt leads immediately
It is logical;
(1-1-2) is as reverse-blocking tetrode thyristor KbAfter setting time is connected, electric current I is first detected1Correct time point when zero crossing,
As electric current I1When zero crossing, controller is immediately to magnetic latching relay switch KcClosure control signal is issued, magnetic latching relay is opened
Close KcIt is closed immediately;
(1-1-3) then detects electric current I again1Correct time point when zero crossing, as electric current I1When zero crossing, controller
Immediately to reverse-blocking tetrode thyristor KbIssue shutdown control signal, reverse-blocking tetrode thyristor KbIt turns off, is only opened at this time by magnetic latching relay immediately
Close KcCurrent supply circuit work is kept, combination switch devoting oneself to work to C phase is so far completed;
(1-2) cuts off combination switch;
(1-2-1) first detects electric current I when the combination switch in C phase to be cut off1Correct time point when zero crossing, when
Electric current I1When zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbIssue conductivity control signal, reverse-blocking tetrode thyristor KbIt is connected immediately,
Delay a period of time makes reverse-blocking tetrode thyristor KbReliable conducting;
(1-2-2) is in reverse-blocking tetrode thyristor KbIn the case where conducting, electric current I is detected again1Correct time point when zero crossing,
As electric current I1When zero crossing, controller is immediately to magnetic latching relay switch KcIt issues and disconnects control signal, magnetic latching relay is opened
Close KcIt then turns off;
(1-2-3) then detects electric current I again1Correct time point when zero crossing, as electric current I1When zero crossing, controller
Immediately to reverse-blocking tetrode thyristor KbIssue shutdown control signal, reverse-blocking tetrode thyristor KbIt turns off immediately;So far combination switch is from C phase
Excision completely.
A kind of itself switching fault judgment method suitable for three-phase and four-line electric energy meter, when answering three-phase and four-line electric energy meter
Combination switch is switched as fault self-checking in use, since the combination switch itself switching failure includes reverse-blocking tetrode thyristor KbCan not
Conducting failure, magnetic latching relay switch KcCan not be closed failure, magnetic latching relay switch KcCan not disconnect failure and can
Control transwitch KbCan not turn off failure;Therefore, the method for judging combination switch itself switching failure includes:
(2-1) judges reverse-blocking tetrode thyristor KbFor can not the method for conducting failure be:
When putting into combination switch, it is assumed that reverse-blocking tetrode thyristor KbIt is in an off state, and magnetic latching relay switch KcAlso locate
Under the premise of off-state,
(2-1-1) is first from controller to reverse-blocking tetrode thyristor KbConductivity control signal is issued, controller waits reverse-blocking tetrode thyristor Kb
The start pulse signal that returns of operation detecting circuit, and trigger pulse counting is carried out with the pulse counter of controller, when prolonging
When 0.2s after, if the trigger pulse number that receives of controller is greater than 5, i.e., it is believed that reverse-blocking tetrode thyristor KbIt can normally lead
It is logical, if the trigger pulse number that receives of controller is several less than 5,
(2-1-2) is again from controller to reverse-blocking tetrode thyristor KbConductivity control signal is issued, and pulse counter is reset, then
After secondary delay 0.2s, if the trigger pulse number that receives of controller is still less than 5, that is, reverse-blocking tetrode thyristor K can determine whetherbFor
It can not conducting failure;
(2-2) judges magnetic latching relay switch KcMethod for that can not be closed failure is:
When putting into combination switch, it is assumed that reverse-blocking tetrode thyristor KbEnergy normally, and reverse-blocking tetrode thyristor KbIt has been on shape
State and magnetic latching relay switch KcUnder the premise of being in an off state,
(2-2-1) is first from controller to magnetic latching relay switch KcClosure control signal is issued, and by pulse counter
It resets, is delayed after 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number be greater than 20 when,
(2-2-2) is again from controller to magnetic latching relay switch KcIt issues and disconnects control signal, and by pulse counter
It resets, then is delayed after the 0.6s time, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number also greater than 20 when,
(2-2-3) is again from controller to magnetic latching relay switch KcClosure control signal is issued, and by step-by-step counting
Device is reset, and is delayed after 0.6s again, at this time if controller receives reverse-blocking tetrode thyristor KbTrigger pulse counting be still greater than 20
When a, that is, it can determine whether magnetic latching relay switch KcFor failure can not be closed;
(2-3) judges magnetic latching relay switch KcMethod for that can not disconnect failure is:
When cutting off combination switch, it is assumed that reverse-blocking tetrode thyristor KbEnergy normally, and reverse-blocking tetrode thyristor KbIt has been in and has disconnected shape
State and magnetic latching relay switch KcUnder the premise of being in closed state,
(2-3-1) is first from controller to reverse-blocking tetrode thyristor KbConductivity control signal is issued by reverse-blocking tetrode thyristor KbConducting, and prolong
When 0.4s after allow reverse-blocking tetrode thyristor KbReliable conducting, and from controller to magnetic latching relay switch KcIt issues and disconnects control signal,
And reset pulse counter, after waiting 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number less than 20
When a;
(2-3-2) is again from controller to magnetic latching relay switch KcIt issues and disconnects control signal, and by pulse counter
It resets, after again waiting for 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number still less than 20 when
Judge magnetic latching relay switch KcFor failure can not be disconnected;
(2-4) judges reverse-blocking tetrode thyristor KbMethod for that can not turn off failure is:
When cutting off combination switch, it is assumed that magnetic latching relay switch KcIt can normally disconnect, and magnetic latching relay switch Kc
It has been in an off state and reverse-blocking tetrode thyristor KbUnder the premise of also on state,
(2-4-1) is first from controller to reverse-blocking tetrode thyristor KbShutdown control signal is issued, and pulse counter is reset, is prolonged
When 0.2s after, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number be greater than 5 when;
(2-4-2) is again from controller to reverse-blocking tetrode thyristor KbShutdown control signal is issued, and pulse counter is reset, then
After secondary delay 0.2s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number when being still greater than 5, that is, can determine whether controllable
Transwitch KbFor failure can not be turned off.
The present invention can reach following effect:
Three-phase and four-line electric energy meter system of the present invention works as 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, which not only adds the flexibilities of entire network load switching, also increase the reliable of phase line switching
Property, can autonomous detection combination switch itself switching failure and standard when accurately detecting AC current zero crossing
True time point, moreover it is possible to correct time point in current zero-crossing point carries out switching, can greatly improve operation of power networks stability and
Reliability, intelligence degree is high, and structure is simple, good reliability, easily automatically controlled to charge and discharge is carried out from the battery pack of electricity consumption power supply module
System.
Detailed description of the invention
Fig. 1 is a kind of use state schematic diagram of circuit principle connecting structure before switching of the embodiment of the present invention.
Fig. 2 is to allow in handoff procedure the sine-wave power for exporting isolating transformer and A phase voltage on the basis of Fig. 1
With a kind of use state schematic diagram of circuit principle connecting structure when amplitude same-phase.
Fig. 3 is to allow switch K43 to be closed on the basis of Fig. 2, and a kind of use state circuit when switch K39 being allowed to disconnect is former
Manage attachment structure schematic diagram.
Fig. 4 is to allow switch K17 to be closed on the basis of Fig. 3, and switch K43 is allowed to disconnect, and makes the power supply of No.1 loading interfaces
Power supply has been switched to a kind of use state schematic diagram of circuit principle connecting structure in C phase from A phase completely.
Fig. 5 is a kind of schematic diagram of circuit principle connecting structure of the embodiment of the present invention from electricity consumption power supply module.
Fig. 6 is that upper electromagnet from the No.1 bulk charging bindiny mechanism of electricity consumption power supply module of the embodiment of the present invention is pressed on down
A kind of attachment structure schematic diagram when on electromagnet.
Fig. 7 is that upper electromagnet from the No.1 bulk charging bindiny mechanism of electricity consumption power supply module of the embodiment of the present invention is not pressed in
A kind of attachment structure schematic diagram when on lower electromagnet.
Fig. 8 is that charger and microcontroller be all at the successive control mechanism of energization of the embodiment of the present invention from electricity consumption power supply module
A kind of use state attachment structure schematic diagram when not powering on also.
Fig. 9 is that the successive control mechanism of energization of the embodiment of the present invention from electricity consumption power supply module is in when powering on, only micro-control
A kind of use state attachment structure schematic diagram when the power input anode of device processed has been powered on.
Figure 10 is that the successive control mechanism of energization of the embodiment of the present invention from electricity consumption power supply module is in when powering on, only micro-control
One kind that the power input anode of device processed powers on when also having been turned on power supply with the power input cathode of microcontroller makes
With state attachment structure schematic diagram.
Figure 11 is that the successive control mechanism of energization of the embodiment of the present invention from electricity consumption power supply module is in when powering on, only micro-control
The power input anode of device processed powers on, the power input cathode 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 when power supply.
Figure 12 is that the successive control mechanism of energization of the embodiment of the present invention from electricity consumption power supply module is in when powering on, microcontroller
Power input anode power on, that the power input cathode of microcontroller also has been turned on power supply, the power supply of charger is defeated
Enter a kind of use state that proper pole also has been turned on when power supply also has been turned on power supply with the power input cathode of charger to connect
Structural schematic diagram.
Figure 13 is a kind of schematic diagram of circuit principle connecting structure that combination switch of the present invention is connected with controller and C phase.
Figure 14 is a kind of waveform diagram of the invention.
Figure 15 is a kind of circuit theory connection structure schematic block diagram that present invention switch K13 to K48 is connected with controller.
Figure 16 is that the present embodiment is connect from a kind of circuit theory that each component of electricity consumption power supply module is connected with controller
Structural schematic block diagram.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment: a kind of three-phase and four-line electric energy meter with fault self-checking, referring to shown in Fig. 1-Figure 16, including three-phase and four-line
Electric energy meter ontology, three-phase and four-line electric energy meter ontology include A phase, B phase, C phase, zero curve N and three-phase electric energy metering module 110, are also wrapped
Include node J1, filter 104 and controller 107 and respectively three-phase equilibrium monitor 101 connected to the controller, No.1 voltage
Sample circuit 102, Single-Phase Inverter Source 103, isolating transformer 105, memory 106, No. two voltage sampling circuits 108 and interfaces
Power monitor 109.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, node J1 connects with the sampling end of the power output end of isolating transformer and No. two voltage sampling circuits respectively
It connects, three-phase electric energy metering module is connect with controller.The no-load voltage ratio of isolating transformer is greater than 1.17.
It further include control terminal switch Ki connected to the controller, wherein i is positive integer, 13≤i≤48.
It further include node J18, node J14 and node J6, the zero line of node J18 is connected with A, the firewire 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
Zero line side is all connect with zero curve N respectively.
The electrical energy measurement end of three-phase electric energy metering module, the monitoring side of three-phase equilibrium monitor and No.1 voltage sampling circuit
Sampling end all connect respectively with node J18, node J14 and node J6.
The power input of Single-Phase Inverter Source is connect by switch K40 with node J18, and the power supply of Single-Phase Inverter Source is defeated
Enter end to connect by switch K41 with node J14, the power input of Single-Phase Inverter Source is connect by switch K42 with node J6.
It further include No.1 loading interfaces 201, two loads being connect respectively with the monitoring side of the interface power monitor
204, No. five loading interfaces 205 of the loading interfaces of loading interfaces 203, four of interface 202, three and No. six loading interfaces 206.
It further 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.
The node J6, switch K13, node J2, switch K14, node J3, switch K15, node J4, switch K16, node
J5 and No. six loading interfaces is sequentially connected in series, the 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, the node J14, switch K29, node
J11, switch K30, node J12, switch K31, node J13 and No. four loading interfaces are sequentially connected in series, and the node J14, are opened
Close K34, node J15, switch K35, node J16 and No. three loading interfaces are sequentially connected in series, the node J18, switch K38,
Node J17 and No. two loading interfaces are sequentially connected in series, the node J18, switch K39, node J19 and No.1 loading interfaces according to
Secondary series connection.
The node J2, switch K17 and node J19 are sequentially connected in series, the node J7, switch K25 and node J19 according to
Secondary series connection, the node J11, switch K32 and node J19 are sequentially connected in series, the node J15, switch K36 and node
J19 is sequentially connected in series, and the node J3, switch K18 and node J17 are sequentially connected in series, the node J8, switch K26 and
Node J17 is sequentially connected in series, and the node J12, switch K33 and node J17 are sequentially connected in series, the node J16, switch
K37 and node J17 are sequentially connected in series, and the node J4, switch K19 and node J16 are sequentially connected in series, the node J9,
Switch K27 and node J16 are sequentially connected in series, and the node J5, switch K20 and node J13 are sequentially connected in series, the node
J10, switch K28 and node J13 are sequentially connected in series.
The node J1, switch K43 and node J19 are sequentially connected in series, the node J1, switch K44 and node J17 according to
Secondary series connection, the node J1, switch K45 and node J16 are sequentially connected in series, the node J1, switch K46 and node
J13 is sequentially connected in series, and the node J1, switch K47 and node J10 are sequentially connected in series.The node J1, switch K48 and
Node J5 is sequentially connected in series.
Referring to shown in Fig. 1, Figure 13, switch K40, switch K41 and switch K42, which are that circuit structure is identical, compound to be opened
It closes;The combination switch includes 701, No. two nodes 702 of No.1 node, the switch 2021, three of No.1 switch 2011, two switch
2031, No. four switches 2041, five switch 2051, six switches 2061, node Ma, node Mb, node Mc, node Md, node Me、
Inductance La, capacitor Ca, capacitor C0, capacitor C2, diode D1, diode D2, diode D3, diode D4, photoelectrical coupler OPT, electricity
Hinder R0, resistance R1, resistance R2, switching switch Ka, Magnetic driving circuit 502, silicon driving circuit 503, from 901 and of electricity consumption power supply module
Ground terminal SGND, the controller 107 include pulse counter 805;The switching switch KaIncluding reverse-blocking tetrode thyristor KbAnd magnetic
Guard relay switch Kc, the photoelectrical coupler OPT includes light emitting diode D5With phototriode Q0;It is described silicon-controlled to open
Close KbOne end and magnetic latching relay switch KcOne end connect respectively with No.1 node, the reverse-blocking tetrode thyristor KbIt is another
End, one end of No.1 switch, No. three one end switched, No. four one end switched and inductance LaOne end respectively with node MaConnection,
The inductance LaThe other end, capacitor CaOne end, No. two switch one end, No. five switch one end and No. six switch one end
Respectively with node MbConnection, magnetic latching relay switch KcThe other end, No.1 switch the other end and No. two switch the other ends
Respectively with node McConnection, the capacitor C2One end, No. four switch the other end, diode D1Positive terminal and diode D3
Negative pole end respectively with node MdConnection, the diode D2Positive terminal, diode D4Negative pole end, capacitor C0One end and
Resistance R2One end respectively with node MeConnection, the other end and resistance R of No. three switches1One end connection, the resistance R1
The other end and capacitor C2The other end connection, No. five switch the other ends and capacitor C0The other end connection, No. six switch it is another
One end and resistance R2The other end connection, the capacitor CaThe other end be connected on No. two nodes, the diode D1Cathode
End and diode D2Negative pole end be connected to light emitting diode D5Positive terminal on, the diode D3Positive terminal and two
Pole pipe D4Positive terminal be connected to light emitting diode D5Negative pole end on, the phototriode Q0Collector terminal difference
With resistance R0One end connected with controller, the phototriode Q0Emitter connect with signal ground end SGND, it is described from
Electricity consumption power supply module respectively with resistance R0The other end, Magnetic driving circuit, silicon driving circuit connected with controller, the silicon driving
Circuit respectively with reverse-blocking tetrode thyristor KbControl terminal connected with controller, the Magnetic driving circuit is opened with magnetic latching relay respectively
Close KcControl terminal connected with controller.When same in discontinuity surface the No.1 node can only be connected to A phase, B phase and C phase this
In a wherein phase in three-phase;No. two nodes are connected on zero curve N.It further include difference display connected to the controller
504 and alarm 507.
Referring to shown in Fig. 5, Figure 16, from electricity consumption power supply module include battery connection module t22, can be mutually indepedent by several
The battery pack t26 that is connected together in series of single battery;From electricity consumption power supply module further include respectively with single battery number
Equal charger, switching switch and current limliting module;Battery connection module includes that the bulk charging equal with single battery number connects
Connection mechanism;Bulk voltage detection chip t101 is respectively equipped in each bulk charging bindiny mechanism;The power supply of each charger exports
It holds on an one-to-one terminals for being connected to each switching switch selection 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, and control terminal, each bulk voltage of the battery connection module t22 detects core
The control terminal of piece t101, the control terminal of each current limliting module and each switching switch are connect with controller respectively;And in controller
Control under, when not be battery pack charging when, battery connection module can by mutually independent single battery each in battery pack according to
Secondary be connected in series becomes series-connected cell, and when for battery pack charging, battery connection module will can successively go here and there in battery pack
Join the series-connected cell to link together and becomes mutually independent single battery.
Charger in this example is charger t2, charge 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 there are three the single battery of the present embodiment battery pack is total, and set these three single batteries difference
For No.1 single battery t19, No. two single battery t20 and No. three single battery t21;The bulk charging of battery connection module connects machine
There are three structure is total, and setting these three bulk charging bindiny mechanisms is respectively No.1 bulk charging bindiny mechanism t12, No. two bulk chargings connections
Mechanism t13 and No. three bulk charging bindiny mechanism t14;Battery connection module further includes a group power output interface t15, No.1 hilted broadsword pair
Throw switch t17, No. two single-pole double-throw switch (SPDT) t18 and single knife switch t16;It is double that the anode of No.1 single battery is connected to No.1 hilted broadsword
In the turning end of throw switch, the No.1 contact of No.1 single-pole double-throw switch (SPDT) is connected to the positive terminal of No.1 bulk charging bindiny mechanism
On end, No. two contacts of No.1 single-pole double-throw switch (SPDT) are connected on No. two contacts of No. two single-pole double-throw switch (SPDT)s, No.1 monomer electricity
The cathode in pond is connected in the negative terminals of No.1 bulk charging bindiny mechanism, and the cathode of No.1 single battery is also connected to a group electricity
In the negative terminals of source output interface;The anode of No. two single batteries is connected to the positive terminal of No. two bulk charging bindiny mechanisms
On end, the anode of No. two single batteries is also connected on the positive terminal of group power output interface, No. two single batteries it is negative
Pole is connected in the negative terminals of No. two bulk charging bindiny mechanisms, and the cathode of No. two single batteries is also connected to single knife switch
On one end;The negative pole t 25 of No. three single batteries 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
No.1 contact be connected in the negative terminals of No. three bulk charging bindiny mechanisms, the positive t23 of No. three single batteries is connected to
On the positive terminal of No. three bulk charging bindiny mechanisms, the anode of No. three single batteries is also connected to the other end of single knife switch
On;The control terminal point of the control terminal of the No.1 single-pole double-throw switch (SPDT), the control terminal of No. two single-pole double-throw switch (SPDT)s and single knife switch
It is not connect with controller.
No. two contacts of the No.1 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, in battery pack charging, No. two contacts of No.1 single-pole double-throw switch (SPDT) and No. two contacts of No. two single-pole double-throw switch (SPDT)s are in
Off-state, No. two touchings of No. two contacts of No.1 single-pole double-throw switch (SPDT) and No. two single-pole double-throw switch (SPDT)s when battery pack and do not charge
Point is in closed state;The No.1 contact of the No.1 single-pole double-throw switch (SPDT) and the No.1 contact of No. two single-pole double-throw switch (SPDT)s are equal
For normally opened contact, the No.1 touching of the No.1 contact of No.1 single-pole double-throw switch (SPDT) and No. two single-pole double-throw switch (SPDT)s in battery pack charging
Point is in closed state, the No.1 contact of No.1 single-pole double-throw switch (SPDT) and No. two single-pole double-throw switch (SPDT)s when battery pack and do not charge
No.1 contact be in off-state;The single knife switch is in an off state when battery pack charges, and is not filled in battery pack
Closed state is in when electric.
Referring to shown in Fig. 6, Fig. 7, each bulk charging bindiny mechanism includes sliding chamber t29, the lower horizontal block t30 that insulate, insulation cunning
Horizontal block t36, sliding bar t32 and activity horizontal block t31, the positive terminal of bulk charging bindiny mechanism include upper on motion block t38, insulation
Positive terminal end t28 and lower positive terminal end t27, the negative terminals of bulk charging bindiny mechanism include upper negative terminals
Head t39 and lower negative terminal end t40;Insulated slide block is slidably arranged in intracavitary, and the lower horizontal block that insulate is fixed at insulation
Cunning below sliding shoe is intracavitary, and the cunning that horizontal block is fixed above insulated slide block in insulation is intracavitary, activity horizontal block activity cloth
The cunning set above the upper horizontal block that insulate is intracavitary, and upper positive terminal end and upper negative terminal end are arranged at insulated slide block
On lower surface, lower positive terminal end and lower negative terminal end are arranged on the upper surface for the lower horizontal block that insulate, in insulation
Horizontal block is equipped 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 between upper horizontal block and insulated slide block insulating
Spring t37 is pulled open, the both ends for pulling open spring are press-connected on the lower surface for the upper horizontal block that insulate and insulated slide block respectively
On upper surface;It is fixed with lower electromagnet t35 on the upper surface for insulating upper horizontal block, upper electromagnet is equipped in activity horizontal block
T33, and the electromagnetic force generated when the energization of upper electromagnet attracts each other with the lower electromagnet electromagnetic force that electricity generates when logical, and powers on
The electromagnetic force that electricity generates when the electromagnetic force and lower electromagnet that magnet generates when being powered are logical can push insulated slide block after attracting each other
It moves down, and upper positive terminal end can be compressed and be conductively connected on lower positive terminal end and can be by upper negative terminals
Head, which compresses, to be conductively connected on lower negative terminal end.
The anode of each single battery is one-to-one to be connected electrically on lower positive terminal end, the cathode one of each single battery
It is connected electrically on lower negative terminal end to one, positive terminal in the one-to-one electrical connection of anode of the other end of each current limliting module
On end, in the one-to-one electrical connection of cathode of the other end of each current limliting module on negative terminal end.
Referring to shown in Fig. 8-Figure 12, the power input of each charger and the power input of controller are conductively connected
It is powered on successive control mechanism t75 at one, and the successive control mechanism that is powered when powering on first is powered to controller, then again
It is powered to charger;The successive control mechanism that is powered in lower electricity first allows charger to power off, and then allows controller to power off again.
Referring to the successive control mechanism that shown in Fig. 8-Figure 12, is powered include right end sealing insulation tube t62, insulation bearing piece t64,
Insulated slide bar t63 and handle t61, insulation bearing piece are fixed on t66 in insulation tube, are transversely provided with slide opening t65 in insulation bearing piece,
Insulated slide bar is slidably arranged in sliding block, and handle is fixedly connected on the left end of insulated slide bar;Under the inner tubal wall of insulation tube
No.1 positive terminal end t71, No.1 negative terminal end t72, No. two anodes are from left to right successively fixed on bottom surface to connect
Line end t73 and No. two negative terminal end t74, and the height of No.1 positive terminal end is higher than No.1 negative terminal end
Height it is high, the height that the height of No.1 negative terminal end is higher than No. two positive terminal ends is high, No. two positive terminal ends
Height height be higher than No. two negative terminal ends height it is high;From a left side on the lower surface of the insulated slide bar of insulation bearing piece right
To the right side be successively fixed with No. three positive terminal end t67, No. three negative terminal end t68, No. four positive terminal end t69 and
No. four negative terminal end t70, and when insulated slide bar is moved to setting position, No. three positive terminal ends, which can compress, leads
It is connected electrically on No.1 positive terminal end, No. three negative terminal ends can compress conductive connection in No.1 negative terminal end
On, No. four positive terminal ends can compress conductive connection on No. two positive terminal ends, and No. four negative terminal ends can compress
It is conductively connected on No. two negative terminal ends;The power input anode of controller is connected electrically in No.1 positive terminal end
Lower end, the power input cathode of controller are connected electrically in the lower end of No.1 negative terminal end, the power input of charger
Anode is connected electrically in the lower end of No. two positive terminal ends, and the power input cathode of charger is connected electrically in No. two negative terminals
The lower end of end;No. three positive terminal ends and No. four positive terminal ends are both electrically connected in the power supply of successive control mechanism that is powered
On the anode of input terminal;No. three negative terminal ends and No. four negative terminal ends are both electrically connected in the successive control mechanism that is powered
On the cathode of power input.
Figure 13 is a kind of schematic diagram of circuit principle connecting structure that combination switch of the present invention is connected with controller and C phase.
Combination switch and the connection circuit and combination switch of A phase and B phase are identical as the connection circuit of C phase.
Figure 14 is a kind of waveform diagram of the invention.(a) reverse-blocking tetrode thyristor K is flowed throughbCurrent waveform schematic diagram, (a)
Flow through reverse-blocking tetrode thyristor KbOperation detecting circuit on the trigger waveform schematic diagram that generates.
When the present embodiment is in use, shown in Figure 1, it is assumed that under normal circumstances, No.1 loading interfaces and No. two loads
Interface is powered by A phase, and No. three loading interfaces with No. four loading interfaces are powered by B phase, No. five loading interfaces and No. six
Loading interfaces are powered by C phase.
The three-phase equilibrium monitor of the present embodiment is in setting time interval to the A phase of three-phase and four-line electric energy meter, B phase and C
Power-balance monitoring is mutually carried out, and the data of monitoring are uploaded to controller, controller immediately uploads three-phase equilibrium monitor
Data carry out calculation processing.If there is any two-phase after the data calculation processing that controller uploads three-phase equilibrium monitor
When the difference of power is greater than the set value, then the maximum phase line of current power is found out, if the maximum phase line of current power is A phase.
Then controller just gives one work order of interface power monitor immediately, and interface power monitor is immediately to No.1
Loading interfaces, No. two loading interfaces, No. three loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces into
Row power monitoring, and monitoring result is uploaded into controller, controller is stood after receiving the data transmitted in one to No. five loading interfaces
Carry out calculation processing.If obtaining being added to the load in No.1 loading interfaces in No. six loading interfaces or being added to after calculating
It is that each phase power of power grid can most be allowed to keep balance in No. six loading interfaces, then under the control of the controller just loading No.1
The power supply of interface is switched to C phase from A phase.
The handoff procedure that the power supply of No.1 loading interfaces is switched to C phase from A phase is as follows:
Firstly, shown in Figure 1, it is assumed that before the handover, switch K17, switch K18, switch K19, switch K20, switch
K25, switch K26, switch K27, switch K28, switch K32, switch K33, switch K36, switch K37, switch K40, switch K41,
Switch K42, switch K43, switch K44, switch K45, switch K46, switch K47 and switch K48 are all in off-state, switch
K13, switch K14, switch K15, switch K16, 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 closed state.
Then, shown in Figure 1, A is connected by the switch of No.1 voltage sampling circuit, the acquisition of No.1 voltage sampling circuit
The voltage signal of A phase is simultaneously uploaded to controller.
Then, shown in Figure 1, switch K42 closure connects C phase and Single-Phase Inverter Source, Single-Phase Inverter Source output
Voltage signal, using the voltage signal that Single-Phase Inverter Source exports as feedback signal, is constituted using the voltage signal of A phase as reference
Closed-loop control generates the driving signal of SPWM in the controller, and the voltage waveform for exporting Single-Phase Inverter Source is through being isolated transformation
Device exports stable sine-wave power.It is shown in Figure 2, when the sine-wave power and the same width of A phase voltage of isolating transformer output
When being worth same-phase, it is closed at switch K43 and disconnection switch K39, the power supply state in No.1 loading interfaces is still at this time
It is identical with the power supply status in A phase.
Then, shown in Figure 3, controller uses phase shifting control, and the voltage waveform for exporting Single-Phase Inverter Source is through filtering
Stable sine-wave power is exported through isolating transformer again after the filtering of wave device.When the sine-wave power and C of isolating transformer output
When phase voltage is with amplitude same-phase, and switch K43 and closure switch K17 are simultaneously switched off, at this time the power supply in No.1 loading interfaces
Power supply status is just completely identical with the power supply status in C phase, i.e., the power supply of No.1 loading interfaces switches from A phase at this time
C phase is arrived.
It is shown in Figure 4, finally switch K42 is disconnected, Single-Phase Inverter Source is bypassed and exits, so far a phase is cut
Changing operation terminates.Other loading interfaces switching principles are identical.
The three-phase and four-line electric energy meter system of the present embodiment, which is worked as, there is the power being connected in each phase of three-phase and four-line electric energy meter not
A part load being connected in the three-phase and four-line electric energy meter high power phase line can be switched to the three-phase and four-line in time when balance
In electric energy meter low-power phase line, which not only adds the flexibilities of entire network load switching, also increase phase line switching
Reliability can greatly improve the stability and reliability of operation of power networks, and intelligence degree is high, good reliability.
The combination switch of the present embodiment is during use, shown in Figure 13, when simultaneously switch off No.1 switch, disconnect
No. four switches, when disconnecting No. five switches, No. two switches of closure, No. three switches of closure and No. six switches of closure, the present embodiment at this time
Combination switch just become the fault self-checking that one can detect itself switching failure and switch;When be closed at No.1 switch,
When being closed No. four switches, No. five switches of closure, disconnecting No. two switches, disconnect No. three switches and disconnect No. six switches, this reality at this time
The combination switch for applying example just becomes correct time point when can accurately detect AC current zero crossing and in electric current
Correct time point when zero crossing carries out the zero crossing fling-cut switch of switching.
One, when using the combination switch of the present embodiment as zero crossing fling-cut switch in use, the principle is as follows:
It is shown in Figure 13, firstly, it is necessary to simultaneously switch off No.1 switch, disconnect No. four switches, disconnect No. five switches, closure
No. six No. two switches, No. three switches of closure and closure switches.At this point, in the combination switch of the present embodiment, inductance LaUsing height
Frequency inductance, inductance LaInductance be tens microhenrys.As reverse-blocking tetrode thyristor KbOr magnetic latching relay switch KcMoment, capacitor is connected
The impedance of Ca is about 0, and due to inductance LaPresence, inductance LaIn conducting moment, frequency changes very greatly, inductance LaImpedance
Also very big, it is suppressed that the dash current of power supply conducting moment;When circuit works normally, since supply frequency is 50Hz power frequency,
Then inductance LaImpedance very little.
In inductance LaIn, inductance LaVoltage ULaAdvanced inductance LaElectric current I190 degree, i.e. inductance LaElectric current I1Fall behind electricity
Feel LaVoltage ULa90 degree.
In capacitor C0In, capacitor C0Electric current I2Advanced capacitor C0Voltage UC090 degree, i.e. capacitor C0Voltage UC0Fall behind electricity
Hold C0Electric current I290 degree.
Electric current I1Pass through inductance La, capacitor Ca formed closed circuit, then have inductance LaOn voltage ULaAdvanced inductance LaOn
Electric current I190 degree.
As inductance LaVoltage ULaIn node M sometimeaPoint be positive, node MbPoint is when being negative, then electric current I2From node
MaPoint passes through diode D1, light emitting diode D5, diode D4With capacitor C0Form branch.
Ignore diode D1, light emitting diode D5With diode D4Pressure drop, it is clear that have i.e. ULa=UC0, i.e. inductance LaElectricity
Press ULaEqual to capacitor C0Voltage UC0.Obviously there is inductance LaOn voltage ULaLag capacitor C0On electric current I290 degree, to have
Capacitor C0On electric current I2With inductance LaOn electric current I1It is reversed each other, i.e. electric current I2With electric current I1It is reversed each other.UCNIt is in C phase
Voltage.
As electric current I2It is positive and be greater than light emitting diode D5When luminous minimum current, the output signal U of photoelectrical couplerI0
Become low level from high level, reasonably selects capacitor C0, make capacitor C0On electric current I2Positive zero crossing and hair can be rapidly achieved
Optical diode D5Luminous minimum current.
As electric current I2After positive zero crossing, the output signal U of photoelectrical couplerI0Become low level from high level, due to
Electric current I2With electric current I1Reversely, then there is the output signal U when photoelectrical couplerI0When becoming high level from low level, electric current I1Just
In positive zero crossing.Therefore the output signal U of photoelectrical couplerI0When becoming 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 give magnetic latching relay switch K immediatelycHair
Signal is opened or closed out.Allow magnetic latching relay switch K if necessarycIt disconnects, then controller is just opened to magnetic latching relay
Close KcIt issues and disconnects control signal, magnetic latching relay switch KcIt then turns off;Allow magnetic latching relay switch K if necessarycIt closes
It closes, then controller just gives magnetic latching relay switch KcIssue closure control signal, magnetic latching relay switch KcIt is closed immediately.
The present embodiment opens magnetic latching relay further according to the correct time point from by obtaining correct time point when current zero-crossing point
Close KcThe control signal that is opened or closed is issued to make magnetic latching relay switch KcContact be opened or closed, then flow through magnetic
Guard relay switch KcElectric current it is small, magnetic latching relay switch K is opened or closed in low currentc, so that magnetic keeps relay
Device switch KcContact be hardly damaged.To effectively extend magnetic latching relay switch KcService life, and then extend compound
The service life of switch.
When putting into combination switch, because of reverse-blocking tetrode thyristor KbThe moment of conducting, due to inductance LaElectric current inhibiting effect,
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 smaller, is closed magnetic latching relay switch K at this timec, to magnetic latching relay
Switch KcContact damage very little, thus effectively extend control transwitch KbService life, and then extend the use of combination switch
Service life.
The present embodiment is in reverse-blocking tetrode thyristor KbIt is on and magnetic latching relay switch KcWhen in closure, if to close
Disconnected reverse-blocking tetrode thyristor Kb, then in electric current I1Zero crossing Shi Cairang reverse-blocking tetrode thyristor KbIt disconnects, it in this way can effective protection be silicon-controlled opens
Close KbService life.
The present embodiment is only in the reverse-blocking tetrode thyristor K that put into combination switch to C phasebWhen throw when just using voltage over zero
Enter, as long as all being put into or being cut off using current over-zero in the case where having electric current on combination switch, substantially increases compound
The service life of switch, reliability is higher, and safety is preferable.
In the present embodiment, as reverse-blocking tetrode thyristor KbWhen conducting, in magnetic latching relay switch KcThere are no disconnect
Under, magnetic latching relay switch K at this timecIt is also conducting, i.e. reverse-blocking tetrode thyristor KbWith magnetic latching relay switch KcIt is same at this time
When it is in the conductive state.Due to reverse-blocking tetrode thyristor KbBranch has inductance LaConducting resistance, it is clear that magnetic latching relay switch Kc
The impedance of branch will be far smaller than reverse-blocking tetrode thyristor KbThe impedance of branch, therefore flow through magnetic latching relay switch KcElectric current it is big
In flowing through reverse-blocking tetrode thyristor KbThe electric current of branch.If magnetic latching relay switch 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 branch1Correct time point when zero crossing, then controller is allowed to issue
Signal is controlled to disconnect magnetic latching relay switch KcContact, allow magnetic latching relay switch KcIt is closed when electric current is smaller
It closes or disconnection movement, thus not easy burn-out magnetic latching relay switch KcOn contact, effectively extend magnetic keep relay
Device switch KcService life, and then also extend the service life of combination switch, structure is simple, high reliablity.
When combination switch as zero crossing fling-cut switch in use, the operation/cutting method of the combination switch is as follows:
(1-1) puts into combination switch.
(1-1-1) first detects voltage U in C phase when to put into combination switch to C phaseCNCorrect time point when zero crossing,
As voltage UCNWhen zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbIssue conductivity control signal, reverse-blocking tetrode thyristor KbIt leads immediately
It is logical.
(1-1-2) is as reverse-blocking tetrode thyristor KbAfter setting time is connected, electric current I is first detected1Correct time point when zero crossing,
As electric current I1When zero crossing, controller is immediately to magnetic latching relay switch KcClosure control signal is issued, magnetic latching relay is opened
Close KcIt is closed immediately.
(1-1-3) then detects electric current I again1Correct time point when zero crossing, as electric current I1When zero crossing, controller
Immediately to reverse-blocking tetrode thyristor KbIssue shutdown control signal, reverse-blocking tetrode thyristor KbIt turns off, is only opened at this time by magnetic latching relay immediately
Close KcCurrent supply circuit work is kept, combination switch devoting oneself to work to C phase is so far completed.
(1-2) cuts off combination switch.
(1-2-1) first detects electric current I when the combination switch in C phase to be cut off1Correct time point when zero crossing, when
Electric current I1When zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbIssue conductivity control signal, reverse-blocking tetrode thyristor KbIt is connected immediately,
Delay a period of time makes reverse-blocking tetrode thyristor KbReliable conducting;
(1-2-2) is in reverse-blocking tetrode thyristor KbIn the case where conducting, electric current I is detected again1Correct time point when zero crossing,
As electric current I1When zero crossing, controller is immediately to magnetic latching relay switch KcIt issues and disconnects control signal, magnetic latching relay is opened
Close KcIt then turns off.
(1-2-3) then detects electric current I again1Correct time point when zero crossing, as electric current I1When zero crossing, controller
Immediately to reverse-blocking tetrode thyristor KbIssue shutdown control signal, reverse-blocking tetrode thyristor KbIt turns off immediately;So far combination switch is from C phase
Excision completely.
Two, it switchs when using the combination switch of the present embodiment as fault self-checking in use, the principle is as follows:
Referring to shown in Figure 13, Figure 14, firstly, it is necessary to simultaneously switch off, No.1 switchs, disconnects No. four switches, disconnection five is opened
Close, No. six No. two switches of closure, No. three switches of closure and closure switches, thus the combination switch of the present embodiment become therefore
Hinder self-test switch.
When needing switching combination switch, controller is to reverse-blocking tetrode thyristor KbConductivity control signal is issued, silicon-controlled open is made
Close KbConducting.Electric current is through reverse-blocking tetrode thyristor Kb, inductance LaWith capacitor CaClosed circuit is formed, inductance L is connected in parallel onaThe capacitor at both ends
C2, diode D1, diode D2, diode D3, diode D4, photoelectrical coupler OPT, resistance R1, resistance R0, resistance R2, from electricity consumption
Power supply module and ground terminal SGND together form reverse-blocking tetrode thyristor KbOperation detecting circuit.Reverse-blocking tetrode thyristor is flowed through in electric current
KbWhen reverse-blocking tetrode thyristor KbOperation detecting circuit can generate start pulse signal, keep after a certain period of time, controller is protected to magnetic
Hold relay switch KcClosure control signal is issued, magnetic latching relay switch K is madecClosure.Magnetic latching relay switch KcClosure
Afterwards by reverse-blocking tetrode thyristor KbWith inductance LaThe series arm of composition is short-circuit, at this time reverse-blocking tetrode thyristor KbOperation detecting circuit will not
Trigger pulse can be generated.Then, controller is to reverse-blocking tetrode thyristor KbIt issues and disconnects control signal, make reverse-blocking tetrode thyristor KbIt disconnects, by
Magnetic latching relay switch KcKeep current supply circuit work.
When needing to cut off combination switch, controller is to reverse-blocking tetrode thyristor KbConductivity control signal is issued, silicon-controlled open is made
Close KbConducting is kept after a certain period of time, and controller is to magnetic latching relay switch KcIt issues and disconnects control signal, magnetic keeps relay
Device switch KcIt then turns off, at this point, silicon-controlled operation detecting circuit will have trigger pulse appearance.Finally, controller is to silicon-controlled
Switch KbIt issues again and disconnects control signal, reverse-blocking tetrode thyristor KbIt then turns off.So far combination switch has just been cut off completely.
The combination switch of the present embodiment has can be carried out self fault detection during switch motion, and without multiple
In addition setting detects the instrument of failure in combination switch, to keep the structure of combination switch simpler, small in size, structure is reliable,
It is low in cost, reduce switching unsuccessful security risk when combination switch uses.
When combination switch being switched as fault self-checking in use, since the combination switch itself switching failure includes controllable
Transwitch KbCan not conducting failure, magnetic latching relay switch KcCan not be closed failure, magnetic latching relay switch KcNothing
Failure and reverse-blocking tetrode thyristor K are opened in decisionbCan not turn off failure.Therefore, judge the method packet of combination switch itself switching failure
It includes:
(2-1) judges reverse-blocking tetrode thyristor KbFor can not the method for conducting failure be:
When putting into combination switch, it is assumed that reverse-blocking tetrode thyristor KbIt is in an off state, and magnetic latching relay switch KcAlso locate
Under the premise of off-state,
(2-1-1) is first from controller to reverse-blocking tetrode thyristor KbConductivity control signal is issued, controller waits reverse-blocking tetrode thyristor Kb
The start pulse signal that returns of operation detecting circuit, and trigger pulse counting is carried out with the pulse counter of controller, when prolonging
When 0.2s after, if the trigger pulse number that receives of controller is greater than 5, i.e., it is believed that reverse-blocking tetrode thyristor KbIt can normally lead
It is logical, if the trigger pulse number that receives of controller is several less than 5,
(2-1-2) is again from controller to reverse-blocking tetrode thyristor KbConductivity control signal is issued, and pulse counter is reset, then
After secondary delay 0.2s, if the trigger pulse number that receives of controller is still less than 5, that is, reverse-blocking tetrode thyristor K can determine whetherbFor
It can not conducting failure.
(2-2) judges magnetic latching relay switch KcMethod for that can not be closed failure is:
When putting into combination switch, it is assumed that reverse-blocking tetrode thyristor KbEnergy normally, and reverse-blocking tetrode thyristor KbIt has been on shape
State and magnetic latching relay switch KcUnder the premise of being in an off state,
(2-2-1) is first from controller to magnetic latching relay switch KcClosure control signal is issued, and by pulse counter
It resets, is delayed after 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number be greater than 20 when,
(2-2-2) is again from controller to magnetic latching relay switch KcIt issues and disconnects control signal, and by pulse counter
It resets, then is delayed after the 0.6s time, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number also greater than 20 when,
(2-2-3) is again from controller to magnetic latching relay switch KcClosure control signal is issued, and by step-by-step counting
Device is reset, and is delayed after 0.6s again, at this time if controller receives reverse-blocking tetrode thyristor KbTrigger pulse counting be still greater than 20
When a, that is, it can determine whether magnetic latching relay switch KcFor failure can not be closed.
(2-3) judges magnetic latching relay switch KcMethod for that can not disconnect failure is:
When cutting off combination switch, it is assumed that reverse-blocking tetrode thyristor KbEnergy normally, and reverse-blocking tetrode thyristor KbIt has been in and has disconnected shape
State and magnetic latching relay switch KcUnder the premise of being in closed state,
(2-3-1) is first from controller to reverse-blocking tetrode thyristor KbConductivity control signal is issued by reverse-blocking tetrode thyristor KbConducting, and prolong
When 0.4s after allow reverse-blocking tetrode thyristor KbReliable conducting, and from controller to magnetic latching relay switch KcIt issues and disconnects control signal,
And reset pulse counter, after waiting 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number less than 20
When a;
(2-3-2) is again from controller to magnetic latching relay switch KcIt issues and disconnects control signal, and by pulse counter
It resets, after again waiting for 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number still less than 20 when
Judge magnetic latching relay switch KcFor failure can not be disconnected.
(2-4) judges reverse-blocking tetrode thyristor KbMethod for that can not turn off failure is:
When cutting off combination switch, it is assumed that magnetic latching relay switch KcIt can normally disconnect, and magnetic latching relay switch Kc
It has been in an off state and reverse-blocking tetrode thyristor KbUnder the premise of also on state,
(2-4-1) is first from controller to reverse-blocking tetrode thyristor KbShutdown control signal is issued, and pulse counter is reset, is prolonged
When 0.2s after, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number be greater than 5 when;
(2-4-2) is again from controller to reverse-blocking tetrode thyristor KbShutdown control signal is issued, and pulse counter is reset, then
After secondary delay 0.2s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number when being still greater than 5, that is, can determine whether controllable
Transwitch KbFor failure can not be turned off.
The combination switch of the present embodiment can detect itself switching failure and accurately detect AC current zero passage respectively
Point when correct time point and voltage over zero when correct time point, can not only distinguish in the case where combination switch has electric current
Guarantee reverse-blocking tetrode thyristor KbWith magnetic latching relay switch KcCorrect time point in current zero-crossing point carries out switching, moreover it is possible to
Combination switch does not have to guarantee reverse-blocking tetrode thyristor K in the case where electric currentbCorrect time point in voltage over zero carries out switching, throws
Cut that electric current is small, when switching will not burn out the contact of switch, and structure is simple, high reliablity, and safety is good, can greatly prolong compound open
The service life of pass.
The present embodiment three-phase and four-line electric energy meter system is uneven when the power for occurring being connected in each phase of three-phase and four-line electric energy meter
A part load being connected in the three-phase and four-line electric energy meter high power phase line can be switched to three-phase and four-line electricity in time when weighing apparatus
Can be in table low-power phase line, which not only adds the flexibility of entire network load switching, also increase phase line switching can
By property, can autonomous detection combination switch itself switching failure and when accurately detecting AC current zero crossing
Correct time point, moreover it is possible to which the correct time point in current zero-crossing point carries out switching, can greatly improve the stability of operation of power networks
And reliability, intelligence degree is high, and structure is simple, good reliability.
The successive control mechanism of the energization of the present embodiment is first powered by controller, and controller just allows battery connection module after being powered
The series-connected cell for being sequentially connected in series together in battery pack is become into mutually independent single battery, is then electrified to successively control
Mechanism just allows charger to be powered, and can be fully ensured that in this way when charger is powered, be mutually indepedent between each single battery
, charging would not be impacted between each single battery, to easily carry out charge and discharge to from the battery pack of electricity consumption power supply module
Control.
For the present embodiment in charging, voltage checking chip can carry out voltage detecting to corresponding single battery.When some list
Body battery can reduce charging current by current limliting module when being full of, and can pass through current limliting when some single battery is not full of far also
Module increases charging current.To make voltage contained by single battery identical as far as possible.When each single battery is full of and each list
The voltage of body battery can disconnect charge power supply when identical.Or when each single battery and underfill and each single battery
Voltage it is identical when can also disconnect charge power supply.It, will not between the single battery of series connection after allowing single battery to be connected in this way
There are electric current flowing, the high reliablity of battery.The charging current or charging voltage of each charger between each other can not be identical.Pass through
Switching switch can select different chargers to some single battery.The cooperation of switching switch and current limliting module can be needed preferably
The single battery to be charged provides charging current and charging voltage in real time, consequently facilitating to the charging progress of each single battery into
Row individually control, is also convenient for individually controlling the charging voltage of each single battery.It is examined during the charging process by temperature
The temperature of single battery can be detected by surveying mechanism, and can carry out overheat protector control to single battery in charging.Pass through
Dual power supply mechanism makes the present embodiment have the function of dual power supply, substantially increases dependable with function.
The present embodiment can make the damage of single single battery will not influence other single battery chargings, and not be battery pack
Mutually independent single battery each in battery pack can be sequentially connected in series when charging and become series-connected cell together, be electric
The series-connected cell for being sequentially connected in series together in battery pack can be become mutually independent single battery when charging by pond group, to every
The charging process of a single battery also can be carried out voltage detecting, and can the charging progress to each single battery individually controlled
System, can also the charging voltage to each single battery individually controlled.And excess temperature guarantor can be carried out to single battery in charging
Shield control.It is powered using dual power supply mechanism and realizes the uninterrupted power supply of electrical equipment.It is highly-safe, good reliability, and be equipped with logical
Electric successively control mechanism, which powers on battery pack, first allows the single battery of series connection to become independent single battery in charging process
After recharge, charge high reliablity.
The battery connection module of the present embodiment can will be each mutually indepedent in battery pack when battery pack can be allowed to charge well
Single battery be sequentially connected in series and become series-connected cell together, can will be sequentially connected in series in battery pack when for battery pack charging
The series-connected cell to link together becomes mutually independent single battery, high reliablity.
The present embodiment, which can improve battery pack in use, can remain each mutually independent list in battery pack
Body battery is sequentially connected in series becomes series-connected cell together, easily automatically controlled to charge and discharge is carried out from the battery pack of electricity consumption power supply module
System, high reliablity.
Embodiments of the present invention are described above in conjunction with attached drawing, however, the implementation is not limited to the above embodiments, this field
Those of ordinary skill can be with various changes and modifications may be made within the scope of the appended claims.
Claims (8)
1. three-phase and four-line electric energy meter, including three-phase and four-line electric energy meter ontology, three-phase and four-line electric energy meter ontology includes A phase, B phase, C
Phase, zero curve N and three-phase electric energy metering module (110), which is characterized in that further include node J1 and controller (107) and difference
Three-phase equilibrium monitor (101) connected to the controller, No.1 voltage sampling circuit (102), Single-Phase Inverter Source (103), every
From transformer (105), No. two voltage sampling circuits (108) and interface power monitor (109);The power supply of Single-Phase Inverter Source is defeated
Outlet is connected with the power input of isolating transformer, node J1 respectively with the power output end of isolating transformer and No. two voltages
The sampling end of sample circuit connects, and three-phase electric energy metering module is connect with controller;
It further include control terminal switch Ki connected to the controller, wherein i is positive integer, 13≤i≤48;
It further 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 curve of the zero line side of node J18, the zero line side of node J14 and node J6
End is all connect with zero curve N respectively;
Electrical energy measurement end, the monitoring side of three-phase equilibrium monitor and the adopting for No.1 voltage sampling circuit of three-phase electric energy metering module
Sample end is all connect with node J18, node J14 and node J6 respectively;
The power input of Single-Phase Inverter Source is connect by switch K40 with node J18, the power input of Single-Phase Inverter Source
It is connect by switch K41 with node J14, the power input of Single-Phase Inverter Source is connect by switch K42 with node J6;
It further include that the No.1 loading interfaces (201) connecting respectively with the monitoring side of the interface power monitor, 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);
It further 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, are opened
Close K30, node J12, switch K31, node J13 and No. four loading interfaces are 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 No.1 loading interfaces are sequentially connected in series
Connection;
The node J2, switch K17 and node J19 are sequentially connected in series, and the node J7, switch K25 and node J19 successively go here and there
Connection connection, the node J11, switch K32 and node J19 are sequentially connected in series, the node J15, switch K36 and node J19
It is sequentially connected in series, the node J3, switch K18 and node J17 are sequentially connected in series, the node J8, switch K26 and node
J17 is sequentially connected in series, and the node J12, switch K33 and node J17 are sequentially connected in series, the node J16, switch K37
It is sequentially connected in series with node J17, the node J4, switch K19 and node J16 are sequentially connected in series, the node J9, switch
K27 and node J16 are sequentially connected in series, and the node J5, switch K20 and node J13 are sequentially connected in series, the node J10,
Switch K28 and node J13 are sequentially connected in series;
The node J1, switch K43 and node J19 are sequentially connected in series, and the node J1, switch K44 and node J17 successively go here and there
Connection connection, the node J1, switch K45 and node J16 be sequentially connected in series, the node J1, switch K46 and node J13 according to
Secondary series connection, the node J1, switch K47 and node J10 are sequentially connected in series;The node J1, switch K48 and node J5
It is sequentially connected in series;
The switch K40, switch K41 and switch K42 are the identical combination switch of circuit structure;The combination switch packet
Include No.1 node (701), No. two nodes (702), No.1 switch (2011), No. two switches (2021), No. three switches (2031), four
Number switch (2041), No. five switches (2051), No. six switches (2061), node Ma, node Mb, node Mc, node Md, node Me、
Inductance La, capacitor Ca, capacitor C0, capacitor C2, diode D1, diode D2, diode D3, diode D4, photoelectrical coupler OPT, electricity
Hinder R0, resistance R1, resistance R2, switching switch Ka, Magnetic driving circuit (502), silicon driving circuit (503), from electricity consumption power supply module
(901) and ground terminal SGND, the controller (107) include pulse counter (805);The switching switch KaIncluding controllable
Transwitch KbWith magnetic latching relay switch Kc, the photoelectrical coupler OPT includes light emitting diode D5With phototriode Q0;
The reverse-blocking tetrode thyristor KbOne end and magnetic latching relay switch KcOne end connect respectively with No.1 node, it is described silicon-controlled
Switch KbThe other end, No.1 switch one end, No. three switch one end, No. four switch one end and inductance LaOne end difference
With node MaConnection, the inductance LaThe other end, capacitor CaOne end, No. two switch one end, No. five switch one end and six
Number switch one end respectively with node MbConnection, magnetic latching relay switch KcThe other end, No.1 switch the other end and No. two
The other end of switch respectively with node McConnection, the capacitor C2One end, No. four switch the other end, diode D1Anode
End and diode D3Negative pole end respectively with node MdConnection, the diode D2Positive terminal, diode D4Negative pole end, electricity
Hold C0One end and resistance R2One end respectively with node MeConnection, the other end and resistance R of No. three switches1One end connect
It connects, the resistance R1The other end and capacitor C2The other end connection, No. five switch the other ends and capacitor C0The other end connect
It connects, the other end and resistance R of No. six switches2The other end connection, the capacitor CaThe other end be connected on No. two nodes, institute
State diode D1Negative pole end and diode D2Negative pole end be connected to light emitting diode D5Positive terminal on, two pole
Pipe D3Positive terminal and diode D4Positive terminal be connected to light emitting diode D5Negative pole end on, the phototriode
Q0Collector terminal respectively with resistance R0One end connected with controller, the phototriode Q0Emitter and signal ground
Hold SGND connection, it is described from electricity consumption power supply module respectively with resistance R0The other end, Magnetic driving circuit, silicon driving circuit and control
Device connection, the silicon driving circuit respectively with reverse-blocking tetrode thyristor KbControl terminal connected with controller, the Magnetic driving circuit point
Not with magnetic latching relay switch KcControl terminal connected with controller;The No.1 node can only connect in discontinuity surface when same
It connects in the wherein phase in A phase, B phase and C phase this three-phase;No. two nodes are connected on zero curve N;
From electricity consumption power supply module include battery connection module, can be sequentially connected in series by several mutually independent single batteries and
At battery pack;It further include charger equal with single battery number respectively, switching switch and current limliting from electricity consumption power supply module
Module;Battery connection module includes the bulk charging bindiny mechanism equal with single battery number;In each bulk charging bindiny mechanism
On be respectively equipped with bulk voltage detection chip;The power output end of each charger is one-to-one to be connected to each switching switch selection end
A terminals on;On one-to-one one end for being connected to current limliting module of turning end of each switching switch, each current limliting module
The one-to-one bulk charging bindiny mechanism for being connected to battery connection module of the other end on;Battery connection module is connected to battery pack
On, the control terminal of the battery connection module, each bulk voltage detection chip, the control terminal and each switching of each current limliting module
The control terminal of switch is connect with controller respectively;And under the control of the controller, when not being battery pack charging, battery connects mould
Mutually independent single battery each in battery pack can be sequentially connected in series by block becomes series-connected cell together, when for battery pack
When charging, the series-connected cell for being sequentially connected in series together in battery pack can be become mutually independent monomer by battery connection module
Battery;
The power input of each charger and the power input of controller are conductively connected the successively control machine that is powered at one
On structure, and the successive control mechanism that is powered when powering on first is powered to controller, then gives charger to be powered again;It is logical in lower electricity
Electric successively control mechanism first allows charger to power off, and then allows controller to power off again.
2. three-phase and four-line electric energy meter according to claim 1, which is characterized in that further include memory connected to the controller
(106)。
3. three-phase and four-line electric energy meter according to claim 1, which is characterized in that further include filter (104), filter string
Connection is connected on the line between the power output end of Single-Phase Inverter Source and the power input of isolating transformer.
4. three-phase and four-line electric energy meter according to claim 1, which is characterized in that the no-load voltage ratio of isolating transformer is greater than 1.17.
5. three-phase and four-line electric energy meter according to claim 1, which is characterized in that further include display connected to the controller
(504)。
6. three-phase and four-line electric energy meter according to claim 1, which is characterized in that further include alarm connected to the controller
(507)。
7. a kind of operating passing zero control method suitable for three-phase and four-line electric energy meter described in claim 1, which is characterized in that when
The combination switch of three-phase and four-line electric energy meter as zero crossing fling-cut switch in use, the operating passing zero controlling party of the combination switch
Method is as follows:
(1-1) puts into combination switch;
(1-1-1) first detects voltage U in C phase when to put into combination switch to C phaseCNCorrect time point when zero crossing, works as electricity
Press UCNWhen zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbIssue conductivity control signal, reverse-blocking tetrode thyristor KbIt is connected immediately;
(1-1-2) is as reverse-blocking tetrode thyristor KbAfter setting time is connected, electric current I is first detected1Correct time point when zero crossing, works as electricity
Flow I1When zero crossing, controller is immediately to magnetic latching relay switch KcIssue closure control signal, magnetic latching relay switch Kc
It is closed immediately;I1For inductance LaElectric current;
(1-1-3) then detects electric current I again1Correct time point when zero crossing, as electric current I1When zero crossing, controller is immediately
To reverse-blocking tetrode thyristor KbIssue shutdown control signal, reverse-blocking tetrode thyristor KbIt turns off immediately, at this time only by magnetic latching relay switch Kc
Current supply circuit work is kept, combination switch devoting oneself to work to C phase is so far completed;
(1-2) cuts off combination switch;
(1-2-1) first detects electric current I when the combination switch in C phase to be cut off1Correct time point when zero crossing, as electric current I1
When zero crossing, controller is immediately to reverse-blocking tetrode thyristor KbIssue conductivity control signal, reverse-blocking tetrode thyristor KbIt is connected immediately, delay one
The section time makes reverse-blocking tetrode thyristor KbReliable conducting;
(1-2-2) is in reverse-blocking tetrode thyristor KbIn the case where conducting, electric current I is detected again1Correct time point when zero crossing, works as electricity
Flow I1When zero crossing, controller is immediately to magnetic latching relay switch KcIt issues and disconnects control signal, magnetic latching relay switch Kc
It then turns off;
(1-2-3) then detects electric current I again1Correct time point when zero crossing, as electric current I1When zero crossing, controller is immediately
To reverse-blocking tetrode thyristor KbIssue shutdown control signal, reverse-blocking tetrode thyristor KbIt turns off immediately;So far combination switch is complete from C phase
Excision.
8. a kind of itself switching fault judgment method suitable for three-phase and four-line electric energy meter described in claim 1, feature exist
In when the combination switch of three-phase and four-line electric energy meter is switched as fault self-checking in use, due to itself switching of the combination switch
Failure includes reverse-blocking tetrode thyristor KbCan not conducting failure, magnetic latching relay switch KcCan not be closed failure, magnetic keep relay
Device switch KcCan not disconnect failure and reverse-blocking tetrode thyristor KbCan not turn off failure;Therefore, judge the event of combination switch itself switching
The method of barrier includes:
(2-1) judges reverse-blocking tetrode thyristor KbFor can not the method for conducting failure be:
When putting into combination switch, it is assumed that reverse-blocking tetrode thyristor KbIt is in an off state, and magnetic latching relay switch KcIt is also at disconnected
Under the premise of open state,
(2-1-1) is first from controller to reverse-blocking tetrode thyristor KbConductivity control signal is issued, controller waits reverse-blocking tetrode thyristor KbFortune
The start pulse signal that row detection circuit returns, and trigger pulse counting is carried out with the pulse counter of controller, work as delay
After 0.2s, if the trigger pulse number that controller receives is greater than 5, i.e., it is believed that reverse-blocking tetrode thyristor KbIt can normally lead
It is logical, if the trigger pulse number that receives of controller is several less than 5,
(2-1-2) is again from controller to reverse-blocking tetrode thyristor KbConductivity control signal is issued, and pulse counter is reset, is prolonged again
When 0.2s after, if the trigger pulse number that receives of controller is still less than 5, that is, can determine whether reverse-blocking tetrode thyristor KbFor can not
Conducting failure;
(2-2) judges magnetic latching relay switch KcMethod for that can not be closed failure is:
When putting into combination switch, it is assumed that reverse-blocking tetrode thyristor KbEnergy normally, and reverse-blocking tetrode thyristor KbIt is in the conductive state and
Magnetic latching relay switch KcUnder the premise of being in an off state,
(2-2-1) is first from controller to magnetic latching relay switch KcClosure control signal is issued, and pulse counter is reset,
It is delayed after 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number be greater than 20 when,
(2-2-2) is again from controller to magnetic latching relay switch KcIt issues and disconnects control signal, and pulse counter is reset,
It is delayed after the 0.6s time again, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number also greater than 20 when,
(2-2-3) is again from controller to magnetic latching relay switch KcClosure control signal is issued, and pulse counter is clear
Zero, it is delayed after 0.6s again, at this time if controller receives reverse-blocking tetrode thyristor KbTrigger pulse counting when being still greater than 20,
It can determine whether magnetic latching relay switch KcFor failure can not be closed;
(2-3) judges magnetic latching relay switch KcMethod for that can not disconnect failure is:
When cutting off combination switch, it is assumed that reverse-blocking tetrode thyristor KbEnergy normally, and reverse-blocking tetrode thyristor KbBe in an off state and
Magnetic latching relay switch KcUnder the premise of being in closed state,
(2-3-1) is first from controller to reverse-blocking tetrode thyristor KbConductivity control signal is issued by reverse-blocking tetrode thyristor KbConducting, and be delayed
Allow reverse-blocking tetrode thyristor K after 0.4sbReliable conducting, and from controller to magnetic latching relay switch KcIt issues and disconnects control signal, and
Pulse counter is reset, after waiting 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number less than 20
When;
(2-3-2) is again from controller to magnetic latching relay switch KcIt issues and disconnects control signal, and pulse counter is reset,
After again waiting for 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number still less than 20 when, that is, can determine whether
Magnetic latching relay switch KcFor failure can not be disconnected;
(2-4) judges reverse-blocking tetrode thyristor KbMethod for that can not turn off failure is:
When cutting off combination switch, it is assumed that magnetic latching relay switch KcIt can normally disconnect, and magnetic latching relay switch KcLocate
In off-state and reverse-blocking tetrode thyristor KbUnder the premise of also on state,
(2-4-1) is first from controller to reverse-blocking tetrode thyristor KbShutdown control signal is issued, and pulse counter is reset, is delayed
After 0.2s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number be greater than 5 when;
(2-4-2) is again from controller to reverse-blocking tetrode thyristor KbShutdown control signal is issued, and pulse counter is reset, is prolonged again
When 0.2s after, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number when being still greater than 5, that is, can determine whether silicon-controlled open
Close KbFor failure can not be turned off.
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101316040A (en) * | 2008-07-10 | 2008-12-03 | 吉林市龙华电力技术有限公司 | Intelligent marshalling combination switch |
CN102904270A (en) * | 2012-11-05 | 2013-01-30 | 镇江长河电力技术有限公司 | Three-phase current unbalance adjusting system for power distribution network |
CN103280807A (en) * | 2013-06-07 | 2013-09-04 | 济南拉斐叶电力科技有限公司 | Distribution network power quality comprehensive compensator |
JP2013198232A (en) * | 2012-03-19 | 2013-09-30 | Mitsubishi Electric Corp | Three-phase unbalance suppression system |
CN104198807A (en) * | 2014-07-31 | 2014-12-10 | 贾智雪 | Intelligent electric meter capable of automatically balancing three-phase loads |
-
2017
- 2017-01-12 CN CN201710029779.3A patent/CN106646214B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101316040A (en) * | 2008-07-10 | 2008-12-03 | 吉林市龙华电力技术有限公司 | Intelligent marshalling combination switch |
JP2013198232A (en) * | 2012-03-19 | 2013-09-30 | Mitsubishi Electric Corp | Three-phase unbalance suppression system |
CN102904270A (en) * | 2012-11-05 | 2013-01-30 | 镇江长河电力技术有限公司 | Three-phase current unbalance adjusting system for power distribution network |
CN103280807A (en) * | 2013-06-07 | 2013-09-04 | 济南拉斐叶电力科技有限公司 | Distribution network power quality comprehensive compensator |
CN104198807A (en) * | 2014-07-31 | 2014-12-10 | 贾智雪 | Intelligent electric meter capable of automatically balancing three-phase loads |
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