CN206020648U - A kind of three-phase and four-line electric energy meter with fault self-checking function - Google Patents
A kind of three-phase and four-line electric energy meter with fault self-checking function Download PDFInfo
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- CN206020648U CN206020648U CN201620988953.8U CN201620988953U CN206020648U CN 206020648 U CN206020648 U CN 206020648U CN 201620988953 U CN201620988953 U CN 201620988953U CN 206020648 U CN206020648 U CN 206020648U
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Abstract
The utility model discloses a kind of three-phase and four-line electric energy meter with fault self-checking function.It is related to electric energy meter technical field, the three-phase and four-line electric energy meter can be switched to the 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 in time 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 body, three-phase and four-line electric energy meter body includes A phase, B phase, C phase, zero line N and three-phase electric energy metering module, also includes node J1 and controller and the three-phase equilibrium monitor being connected respectively, voltage sampling circuit, Single-Phase Inverter Source, No. two voltage sampling circuits and an interface power monitor with controller；The power input connection of the power output end and isolating transformer of Single-Phase Inverter Source, node J1 are connected with the sampling end of the power output end and No. two voltage sampling circuits of isolating transformer respectively, and three-phase electric energy metering module is connected with controller.
Description
Technical field
The utility model is related to electric energy meter technical field, and in particular to a kind of three-phase and four-line electricity with fault self-checking function
Can table.
Background technology
With the development of economic society, the type of electrical equipment is more and more.As current electric power system is typically all
Three-phase power supply system, in three-phase power supply system, if power on three-phase occurs larger asymmetric, just occurs electrical network
Off-center operation, just occur electrical network shake.
When operation of power networks is in non-equilibrium state, the transformer in electrical network is at asymmetric operation state, in not right
Claim the transformer of running status that the zero-sequence current of transformer can be made excessive, excessive zero-sequence current can make the local part of transformer
Temperature increases, if the local Part temperature of transformer increase excessive may burn transformer, so as to cause electric power system
Power outage.
When unbalanced power supply runs, if wanting the electrical network for allowing the electrical network of off-center operation to be changed into balance movement, at present
The method that takes is will be big to another for the part load manual switching on a large scale the high power phase line of section
In the low-power phase line of scope section.As this switching mode is more in the load that moment switches, cause rushing for moment switching
Hit that electric current is excessive, excessive dash current not only can burn out switching equipment, due also in load switching at that moment, the load
Power supply phase line difference before and after switching can cause the loaded work piece that chaotic even damage occurs.
All used by certain particular user due to specifically loading, all electricity consumptions of each particular user will use electric energy
Table carries out electric energy metrical, therefore, if the basic phase line switching list that can be switched with all loads that electric energy meter is connected as phase line
Unit, then as long as the power in each the basic phase line switch unit in whole electrical network is in a basic balance then it is ensured that whole
The power of electrical network be also in a basic balance, will electrical network be in balance movement state.
With the basic phase line switch unit that all loads that electric energy meter is connected switch as phase line, electrical network is this not only adds
Phase line switching flexibility, due on an electric energy meter connect load for one on a large scale section much less, this
Plant the dash current produced by phase line switching and also want considerably less.Therefore, if the electric energy can will be connected in time by electric energy meter
Part load in table high power phase line is switched in the electric energy meter low-power phase line, be which not only adds whole electrical network and is born
The flexibility of switching is carried, the reliability of phase line switching is also increased, is substantially increased the stability of operation of power networks.Therefore, design
A kind of energy is automatically obtained in high power phase line according to the unbalanced power for being connected to load in each phase line of three-phase and four-line electric energy meter
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 seems very necessary.
Utility model content
The utility model is that do not have phase line handoff functionality to solve existing three-phase and four-line electric energy meter, causes to occur being connected to
To can not be connected in the three-phase and four-line electric energy meter high power phase line during unbalanced power in each phase of three-phase and four-line electric energy meter
Part load is switched to the deficiency in the three-phase and four-line electric energy meter low-power phase line, there is provided a kind of ought occur being connected to three-phase four
One will can be connected in the three-phase and four-line electric energy meter high power phase line in time during unbalanced power in each phase of line electric energy meter
Load is divided to be switched in the three-phase and four-line electric energy meter low-power phase line, switching electric current is little, will not burn out combination switch, energy during switching
Itself switching failure of autonomous detection combination switch, simple structure, the high one kind of intelligence degree have fault self-checking work(
The three-phase and four-line electric energy meter of energy.
To achieve these goals, the utility model is employed the following technical solutions：
A kind of three-phase and four-line electric energy meter with fault self-checking function, including three-phase and four-line electric energy meter body, three-phase and four-line
Electric energy meter body includes A phase, B phase, C phase, zero line N and three-phase electric energy metering module, also includes node J1 and controller and divides
The three-phase equilibrium monitor that is not connected with controller, voltage sampling circuit, Single-Phase Inverter Source, isolating transformer, No. two
Voltage sampling circuit and interface power monitor.The power input of the power output end and isolating transformer of Single-Phase Inverter Source
Connection, node J1 are connected with the sampling end of the power output end and No. two voltage sampling circuits of isolating transformer respectively, three-phase electricity
Energy metering module is connected with controller.
Also include the switch Ki that control end is connected with controller, wherein i is positive integer, 1≤i≤42.
Also include that node J18, node J14 and node J6, the zero line of node J18 are connected with A, the live wire of node J14
End is connected with B, and the zero line of node J6 is connected with C.The zero line side of node J18, the zero line side of node J14 and node J6's
Zero line side is all connected with zero line N respectively.
The electric energy metrical end of three-phase electric energy metering module, the monitoring side of three-phase equilibrium monitor and a voltage sampling circuit
Sampling end be all connected with node J18, node J14 and node J6 respectively.
The power input of Single-Phase Inverter Source is connected with node J18 by switching K40, and the power supply of Single-Phase Inverter Source is defeated
Enter end and be connected with node J14 by switching K41, the power input of Single-Phase Inverter Source is connected with node J6 by switching K42.
Loading interfaces also including being connected with the monitoring side of interface power monitor respectively, No. two loading interfaces, three
Number loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces.
Also include node J2, node J3, node J4, node J5, node J7, node J8, node J9, node J10, node
J11, node J12, node J13, node J15, node J16, node J17 and node J19.
Node J6, switch K13, node J2, switch K14, node J3, switch K15, node J4, switch K16, node J5 and
No. six loading interfaces are sequentially connected in series, node J6, switch K21, node J7, switch K22, node J8, switch K23, node J9,
Switch K24, node J10 and No. five loading interfaces are sequentially connected in series, node J14, switch K29, node J11, switch K30, section
Point J12, switch K31, node J13 and No. four loading interfaces are sequentially connected in series, node J14, switch K34, node J15, switch
K35, node J16 and No. three loading interfaces are sequentially connected in series, node J18, switch K38, node J17 and No. two loading interfaces according to
Secondary be connected in series, node J18, switch K39, node J19 and loading interfaces are sequentially connected in series.
Node J1, switch K1, node J2, switch K17 and node J19 are sequentially connected in series, node J1, switch K2, node
J7, switch K25 and node J19 are sequentially connected in series, and node J1, switch K3, node J11, switch K32 and node J19 are gone here and there successively
Connection connection, node J1, switch K4, node J15, switch K36 and node J19 are sequentially connected in series, node J1, switch K5, node
J3, switch K18 and node J17 are sequentially connected in series, and node J1, switch K6, node J8, switch K26 and node J17 are sequentially connected in series
Connection, node J1, switch K7, node J12, switch K33 and node J17 are sequentially connected in series, node J1, switch K8, node
J16, switch K37 and node J17 are sequentially connected in series, and node J1, switch K9, node J4, switch K19 and node J16 are gone here and there successively
Connection connection, node J1, switch K10, node J9, switch K27 and node J16 are sequentially connected in series, node J1, switch K11, node
J5, switch K20 and node J13 are sequentially connected in series, and node J1, switch K12, node J10, switch K28 and node J13 are gone here and there successively
Connection connection.
The switch K40, switch K41 and pass K42 are the identical combination switch of circuit structure；The combination switch
Including a node, No. two nodes, node Msa, node Mb, inductance La, electric capacity Ca, electric capacity C2, diode D1, diode D2, two poles
Pipe D3, diode D4, photoelectrical coupler OPT, resistance R0, resistance R1, resistance R2, switching switch Ka, Magnetic driving electric power road, silicon drive
Circuit, from electricity consumption supply module and earth terminal SGND, the controller includes pulse counter；The switching switch KaIncluding
Reverse-blocking tetrode thyristor KbK is switched with magnetic latching relayc, the photoelectrical coupler OPT includes light emitting diode D5And phototriode
Q0；The reverse-blocking tetrode thyristor KbOne end and magnetic latching relay switch KcOne end be connected with a node respectively, described controllable
Transwitch KbThe other end, one end of resistance R1 and inductance LaOne end respectively with node MaConnection, the inductance LaAnother
End, magnetic latching relay switch KcThe other end, one end of resistance R2 and electric capacity CaOne end respectively with node MbConnection, described
Electric capacity CaThe other end be connected on No. two nodes, the other end of resistance R1 and electric capacity C2One end connection, the diode D1's
Positive terminal and diode D3Negative pole end be connected to electric capacity C2The other end on, the diode D2Positive terminal and two poles
Pipe D4Negative pole end be connected to resistance R2The other end on, the diode D1Negative pole end and diode D2Negative pole end
It is connected to light emitting diode D5Positive terminal on, the diode D3Positive terminal and diode D4Positive terminal connect respectively
It is connected on light emitting diode D5Negative pole end on, the phototriode Q0Collector terminal respectively with resistance R0One end and control
Device connects, the phototriode Q0Emitter stage be connected with signal ground end SGND, described from electricity consumption supply module respectively with
Resistance R0The other end, Magnetic driving circuit, silicon drive circuit and controller connection, the silicon drive circuit opened with controllable silicon respectively
Close KbControl end and controller connection, the Magnetic driving circuit respectively with magnetic latching relay switch KcControl end and control
Device connects.When same, in discontinuity surface, a node can only be connected to the wherein phase in A phases, B phases and C phases this three-phases
On；No. two nodes are connected on zero line N.
This programme is when using, it is assumed that in general, loading interfaces are all to be supplied by A phases with No. two loading interfaces
Electricity, No. three loading interfaces are all to be powered by B phases with No. four loading interfaces, 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 is spaced to the A phases of three-phase and four-line electric energy meter, B phases and C phases
Power-balance monitoring is carried out, and the data of monitoring are uploaded to controller, controller is uploaded to three-phase equilibrium monitor immediately
Data carry out calculating process.If there is any two-phase work(after processing in the data calculating that controller is uploaded to three-phase equilibrium monitor
When the difference of rate is more than setting value, then the maximum phase line of current power is found out, if the maximum phase line of current power is A phases.
Then controller just gives one work order of interface power monitor immediately, and interface power monitor is immediately to No. one
Loading interfaces, No. two loading interfaces, No. three loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces are entered
Row power monitoring, and monitoring result is uploaded controller, controller is stood after receiving the data transmitted in one to No. five loading interfaces
Calculating process is carried out.If obtained the load in loading interfaces being added in No. six loading interfaces or being added to after calculating
It is most to allow each phase power of electrical network to keep balance in No. six loading interfaces, then just No. one is loaded under the control of the controller
The power supply of interface is switched to C phases from A phases.
The power supply of number loading interfaces is as follows from the handoff procedure that A phases are switched to C phases：
First, it is assumed that before the handover, switch K1 is to switching K20, switch K25, switch K26, switch K27, switch K28, open
K32, switch K33, switch K36, switch K37, switch K40, switch K41 and switch K42 are closed all in off-state, switch K21,
Switch K22, switch K23, switch K24, switch K29, switch K30, switch K31, switch K34, switch K35, switch K38 and switch
K39 is all in closure state.
Then, A is connected by the switch of a voltage sampling circuit, the voltage letter of a voltage sampling circuit collection A phase
Number and be uploaded to controller.
Then, switch K42 closures connect C phases and Single-Phase Inverter Source, and the voltage signal of Single-Phase Inverter Source output is with A phases
Voltage signal as reference, the voltage signal using Single-Phase Inverter Source output constitutes closed-loop control as feedback signal, in control
The drive signal of SPWM is produced in device processed, makes the voltage waveform of Single-Phase Inverter Source output stable just through isolating transformer output
String ripple power supply.When sine-wave power and the A phase voltages of isolating transformer output are with amplitude same-phase, be closed at switching K1 and
K17 is switched, and simultaneously switches off switch K39, now power supply shape of the power supply state in loading interfaces still and in A phases
State is identical.
Then, controller adopts phase shifting control, after the filtered device filtering of the voltage waveform for exporting Single-Phase Inverter Source again
Stable sine-wave power is exported through isolating transformer.Sine-wave power and the same amplitude of C phase voltages when isolating transformer output
During same-phase, switch K1 is disconnected, and be closed at switching K13, now the power supply state in loading interfaces is just complete
Identical with the power supply status in C phases, i.e., now the power supply of loading interfaces has been switched to C phases from A phases.
Finally switch K42 is disconnected, is bypassed Single-Phase Inverter Source and is exited, so far a Phase-switching end of job.
Other loading interfaces switching principles are identical.
The combination switch fault self-checking principle of this programme is as follows：
When switching combination switch is needed, controller is to reverse-blocking tetrode thyristor KbConductivity control signal is sent, opens controllable silicon
Close KbConducting.Electric current is through reverse-blocking tetrode thyristor Kb, inductance LaWith electric capacity CaClosed-loop path is formed, inductance L is connected in parallel onaThe electric capacity at two ends
C2, diode D1, diode D2, diode D3, diode D4, photoelectrical coupler OPT, resistance R1, resistance R0, resistance R2, from electricity consumption
Supply module and earth terminal SGND together form reverse-blocking tetrode thyristor KbOperation detecting circuit.Reverse-blocking tetrode thyristor is flow through in electric current
KbWhen reverse-blocking tetrode thyristor KbOperation detecting circuit can produce start pulse signal, after being kept for certain time, controller is protected to magnetic
Hold relay switch KcClosure control signal is sent, makes magnetic latching relay switch KcClosure.Magnetic latching relay switchs KcClosure
Afterwards by reverse-blocking tetrode thyristor KbWith inductance LaThe series arm of composition is short-circuit, now reverse-blocking tetrode thyristor KbOperation detecting circuit will not
Trigger pulse can be produced.Then, controller is to reverse-blocking tetrode thyristor KbDisconnection control signal is sent, reverse-blocking tetrode thyristor K is madebDisconnect, by
Magnetic latching relay switchs KcKeep current supply circuit work.
When needing to cut off combination switch, controller is to reverse-blocking tetrode thyristor KbConductivity control signal is sent, opens controllable silicon
Close KbConducting, after being kept for certain time, controller switchs K to magnetic latching relaycDisconnection control signal is sent, magnetic keeps relay
Device switchs KcThen turn off, now, controllable silicon operation detecting circuit there will be trigger pulse to occur.Finally, controller is to controllable silicon
Switch KbDisconnection control signal, reverse-blocking tetrode thyristor K are sent againbThen turn off.So far combination switch has just been cut off completely.
The combination switch of this programme possesses, and without the need for compound
In addition the instrument of detection failure is set in switch, so that the structure of combination switch is simpler, small volume, structure reliability, into
This is cheap, reduces switching unsuccessful potential safety hazard when combination switch is used.
The combination switch of this programme itself switching failure includes reverse-blocking tetrode thyristor KbCannot conducting failure, magnetic keep relay
Device switchs KcCannot close failure, magnetic latching relay switch KcCannot disconnect failure and reverse-blocking tetrode thyristor KbCannot close
Disconnected failure.Therefore, judge that the method for combination switch itself switching failure includes：
(2-1) judge reverse-blocking tetrode thyristor KbFor cannot the method for conducting failure be：
When combination switch is put into, it is assumed that reverse-blocking tetrode thyristor KbIt is off state, and magnetic latching relay switch KcAlso locate
On the premise of off-state,
(2-1-1) first from controller to reverse-blocking tetrode thyristor KbConductivity control signal is sent, controller waits reverse-blocking tetrode thyristor Kb
Operation detecting circuit return start pulse signal, and carried out with the pulse counter of controller trigger trigger pulse count,
After the delay adjustmentses time, if the trigger pulse number that controller is received is more than setting number, you can think the controllable silicon
Switch KbEnergy normally, if the trigger pulse number that controller is received is less than when setting number,
(2-1-2) again from controller to reverse-blocking tetrode thyristor KbConductivity control signal is sent, and pulse counter is reset, then
After the secondary delay adjustmentses time, if the trigger pulse number that receives of controller is still less than number is set, you can judge that this is controllable
Transwitch KbFor cannot conducting failure.
(2-2) judge magnetic latching relay switch KcFor the method for failure cannot be closed it is：
When combination switch is put into, it is assumed that reverse-blocking tetrode thyristor KbEnergy normally, and reverse-blocking tetrode thyristor KbShape has been on
State and magnetic latching relay switch KcOn the premise of being off,
(2-2-1) first K is switched from controller to magnetic latching relaycSend closure control signal, and by pulse counter
Reset, after the delay adjustmentses time, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number more than set number when,
(2-2-2) K is switched from controller to magnetic latching relay againcSend disconnection control signal, and by pulse counter
Reset, then after the delay adjustmentses time, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number more than also set number
When,
(2-2-3) K is switched from controller to magnetic latching relay againcSend closure control signal, and by step-by-step counting
Device resets, again after the delay adjustmentses time, if now controller receives reverse-blocking tetrode thyristor KbTrigger pulse count still big
When number is set, you can judge magnetic latching relay switch KcFor failure cannot be closed.
(2-3) judge magnetic latching relay switch KcFor the method for failure cannot be disconnected it is：
When combination switch is cut off, it is assumed that reverse-blocking tetrode thyristor KbEnergy normally, and reverse-blocking tetrode thyristor KbIn disconnection shape
State and magnetic latching relay switch KcOn the premise of being in closure state,
(2-3-1) first from controller to reverse-blocking tetrode thyristor KbConductivity control signal is sent by reverse-blocking tetrode thyristor KbConducting, and prolong
When setting time allow reverse-blocking tetrode thyristor KbAfter reliable conducting, and K is switched from controller to magnetic latching relaycSend disconnection control
Signal, and pulse counter is reset, after waiting setting time, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse
When number is less than number is set；
(2-3-2) K is switched from controller to magnetic latching relay againcSend disconnection control signal, and by pulse counter
Reset, after again waiting for setting time, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number still less than set
During number, you can judge magnetic latching relay switch KcFor failure cannot be disconnected.
(2-4) judge reverse-blocking tetrode thyristor KbFor the method for failure cannot be turned off it is：
When combination switch is cut off, it is assumed that magnetic latching relay switchs KcNormally can disconnect, and magnetic latching relay switch Kc
It has been off and reverse-blocking tetrode thyristor KbOn the premise of also in conducting state,
(2-4-1) first from controller to reverse-blocking tetrode thyristor KbShut-off control signal is sent, and pulse counter is reset, prolonged
When setting time after, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number more than set number when；
(2-4-2) again from controller to reverse-blocking tetrode thyristor KbShut-off control signal is sent, and pulse counter is reset, then
After the secondary delay adjustmentses time, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number still greater than set number when, i.e.,
Can determine whether reverse-blocking tetrode thyristor KbFor failure cannot be turned off.
The combination switch of this programme can carry out the intellectualized detection of combination switch itself switching failure, user can be allowed in time to know
Whether road combination switch occurs in that failure, is easy to replacing in time, and simple structure, reliability are high, and security is good.
Preferably, also including the memory being connected with controller.Memory is easy to the letter for storing three-phase and four-line electric energy meter
Breath, simple and easy to use.
Preferably, also including filter, filter is connected in series in the power output end of Single-Phase Inverter Source and isolation
On line between the power input of transformer.Filter improve isolating transformer input reliability, and then cause every
Reliability from transformer output is higher.
Preferably, the no-load voltage ratio of isolating transformer is more than 1.17.Width due to the sinusoidal voltage of Single-Phase Inverter Source output
Maximum there was only input voltage 0.85 times of value, therefore connects isolating transformer in the back of wave filter, and no-load voltage ratio is more than 1.17, so that
The output voltage amplitude of switching three-phase and four-line electric energy meter reaches 220V, improves the practicality and reliability of three-phase and four-line electric energy meter
Property.
Preferably, also including the display being connected with controller.Display is easy to user to observe, simple and easy to use.
Preferably, also including the alarm being connected with controller.Control after combination switch itself switching breaks down
Device sends alarm command to alarm, and alarm sends alarm sound immediately, is easy to user to change combination switch in time.
The present invention can reach following effect：
The utility model three-phase and four-line electric energy meter three-phase and four-line electric energy meter ought occur being connected to each phase of three-phase and four-line electric energy meter
On unbalanced power 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
In the three-phase and four-line electric energy meter low-power phase line, switching electric current is little, will not burn out combination switch during switching, can autonomous detection
Itself switching failure of combination switch, simple structure, intelligence degree are high, which not only adds whole network load switching
Flexibility, also increases the reliability of phase line switching, can greatly improve the stability and reliability of operation of power networks, intelligence degree
Height, good reliability.
Description of the drawings
Fig. 1 is a kind of use state circuit theory attachment structure schematic diagram before the switching of the utility model embodiment.
Fig. 2 is sine-wave power and the A phase voltage for making isolating transformer output in the utility model embodiment handoff procedure
With a kind of use state circuit theory attachment structure schematic diagram during amplitude same-phase.
Fig. 3 is to allow switch K1 and switch K17 closures on the basis of Fig. 2, a kind of use state when allowing switch K39 to disconnect
Circuit theory attachment structure schematic diagram.
Fig. 4 is that the power supply of number loading interfaces of the utility model embodiment has been switched in C phases one from A phases
Plant use state circuit theory attachment structure schematic diagram.
Fig. 5 is a kind of circuit theory attachment structure schematic block diagram of the utility model controller and each switch.
Fig. 6 is that a kind of circuit theory attachment structure that the utility model combination switch is connected with controller and C phases is illustrated
Figure.
Fig. 7 is a kind of waveform diagram of the present utility model.
Specific embodiment
Below by embodiment, and accompanying drawing is combined, the technical solution of the utility model is described in further detail.
Embodiment：A kind of three-phase and four-line electric energy meter with fault self-checking function, referring to shown in Fig. 1, Fig. 5, including three-phase
Four line electric energy meter bodies, three-phase and four-line electric energy meter body include A phase, B phase, C phase, zero line N and three-phase electric energy metering module 110.
Also include node J1, filter 104 and controller 107 and the three-phase equilibrium monitor 101, being connected respectively with controller
Voltage sampling circuit 102, Single-Phase Inverter Source 103, isolating transformer 105,106, No. two 108 and of voltage sampling circuit of memory
Interface power monitor 109.Filter power input respectively with the power output end and isolating transformer of Single-Phase Inverter Source
End connection, node J1 are connected with the sampling end of the power output end and No. two voltage sampling circuits of isolating transformer respectively, three-phase
Electric energy metering module is connected with controller.The no-load voltage ratio of isolating transformer is more than 1.17.
Also include the switch Ki that control end is connected with controller, wherein i is positive integer, i=1,1≤i≤42.
Also include that node J18, node J14 and node J6, the zero line of node J18 are connected with A, the live wire of node J14
End is connected with B, and the zero line of node J6 is connected with C.The zero line side of node J18, the zero line side of node J14 and node J6's
Zero line side is all connected with zero line N respectively.
The electric energy metrical end of three-phase electric energy metering module, the monitoring side of three-phase equilibrium monitor and a voltage sampling circuit
Sampling end be all connected with node J18, node J14 and node J6 respectively.
The power input of Single-Phase Inverter Source is connected with node J18 by switching K40, and the power supply of Single-Phase Inverter Source is defeated
Enter end and be connected with node J14 by switching K41, the power input of Single-Phase Inverter Source is connected with node J6 by switching K42.
Also include 201, No. two loading interfaces of loading interfaces being connected respectively with the monitoring side of interface power monitor
202nd, No. three loading interfaces 205 of loading interfaces 204, five of loading interfaces 203, four and No. six loading interfaces 206.
Also include node J2, node J3, node J4, node J5, node J7, node J8, node J9, node J10, node
J11, node J12, node J13, node J15, node J16, node J17 and node J19.
Node J6, switch K13, node J2, switch K14, node J3, switch K15, node J4, switch K16, node J5 and
No. six loading interfaces are sequentially connected in series, node J6, switch K21, node J7, switch K22, node J8, switch K23, node J9,
Switch K24, node J10 and No. five loading interfaces are sequentially connected in series, node J14, switch K29, node J11, switch K30, section
Point J12, switch K31, node J13 and No. four loading interfaces are sequentially connected in series, node J14, switch K34, node J15, switch
K35, node J16 and No. three loading interfaces are sequentially connected in series, node J18, switch K38, node J17 and No. two loading interfaces according to
Secondary be connected in series, node J18, switch K39, node J19 and loading interfaces are sequentially connected in series.
Node J1, switch K1, node J2, switch K17 and node J19 are sequentially connected in series, node J1, switch K2, node
J7, switch K25 and node J19 are sequentially connected in series, and node J1, switch K3, node J11, switch K32 and node J19 are gone here and there successively
Connection connection, node J1, switch K4, node J15, switch K36 and node J19 are sequentially connected in series, node J1, switch K5, node
J3, switch K18 and node J17 are sequentially connected in series, and node J1, switch K6, node J8, switch K26 and node J17 are sequentially connected in series
Connection, node J1, switch K7, node J12, switch K33 and node J17 are sequentially connected in series, node J1, switch K8, node
J16, switch K37 and node J17 are sequentially connected in series, and node J1, switch K9, node J4, switch K19 and node J16 are gone here and there successively
Connection connection, node J1, switch K10, node J9, switch K27 and node J16 are sequentially connected in series, node J1, switch K11, node
J5, switch K20 and node J13 are sequentially connected in series, and node J1, switch K12, node J10, switch K28 and node J13 are gone here and there successively
Connection connection.
Participate in shown in Fig. 6, the switch K40, switch K41 and pass K42 are the identical combination switch of circuit structure；
The combination switch includes 701, No. two nodes 702, node M of a nodea, node Mb, inductance La, electric capacity Ca, electric capacity C2, two poles
Pipe D1, diode D2, diode D3, diode D4, photoelectrical coupler OPT, resistance R0, resistance R1, resistance R2, switching switch Ka, magnetic
Drive electric power road 502, silicon drive circuit 503, from electricity consumption supply module 901 and earth terminal SGND, the controller 107 includes
Pulse counter 805；The switching switch KaIncluding reverse-blocking tetrode thyristor KbK is switched with magnetic latching relayc, the photoelectric coupling
Device OPT includes light emitting diode D5With phototriode Q0；The reverse-blocking tetrode thyristor KbOne end and magnetic latching relay switch Kc
One end be connected with a node respectively, the reverse-blocking tetrode thyristor KbThe other end, one end of resistance R1 and inductance LaOne end point
Not and node MaConnection, the inductance LaThe other end, magnetic latching relay switch KcThe other end, one end of resistance R2 and electricity
Hold CaOne end respectively with node MbConnection, the electric capacity CaThe other end be connected on No. two nodes, the other end of resistance R1 with
Electric capacity C2One end connection, the diode D1Positive terminal and diode D3Negative pole end be connected to electric capacity C2Another
On end, the diode D2Positive terminal and diode D4Negative pole end be connected to resistance R2The other end on, two pole
Pipe D1Negative pole end and diode D2Negative pole end be connected to light emitting diode D5Positive terminal on, the diode D3's
Positive terminal and diode D4Positive terminal be connected to light emitting diode D5Negative pole end on, the phototriode Q0Collection
Electrode tip respectively with resistance R0One end and controller connection, the phototriode Q0Emitter stage and signal ground end SGND
Connection, described from electricity consumption supply module respectively with resistance R0The other end, Magnetic driving circuit, silicon drive circuit and controller connect
Connect, the silicon drive circuit respectively with reverse-blocking tetrode thyristor KbControl end and controller connection, the Magnetic driving circuit respectively with
Magnetic latching relay switchs KcControl end and controller connection.When same, in discontinuity surface, a node 701 can only connect
It is connected in the wherein phase in A phases, B phases and C phases this three-phases；No. two nodes 702 are connected on zero line N.Also include distinguishing
The display 504 being connected with controller and alarm 507.
Fig. 6 is that a kind of circuit theory attachment structure that the utility model combination switch is connected with controller and C phases is illustrated
Figure.Combination switch is identical with the connection circuit of C phases with the connection circuit and combination switch of A phases and B phases.
Fig. 7 is a kind of waveform diagram of the present utility model.A () flows through reverse-blocking tetrode thyristor KbCurrent waveform schematic diagram,
A () flows through reverse-blocking tetrode thyristor KbOperation detecting circuit on produce trigger waveform schematic diagram.
The present embodiment use when, shown in Figure 1, it is assumed that in general, loading interfaces and No. two load
Interface is powered by A phases, and No. three loading interfaces are all to be powered by B phases with No. four loading interfaces, No. five loading interfaces and No. six
Loading interfaces are powered by C phases.
The three-phase equilibrium monitor of the present embodiment is in setting time is spaced to the A phases of three-phase and four-line electric energy meter, B phases and C
Power-balance monitoring is mutually carried out, and the data of monitoring are uploaded to controller, controller is uploaded to three-phase equilibrium monitor immediately
Data carry out calculating process.If there is any two-phase after processing in the data calculating that controller is uploaded to three-phase equilibrium monitor
When the difference of power is more than setting value, then the maximum phase line of current power is found out, if the maximum phase line of current power is A phases.
Then controller just gives one work order of interface power monitor immediately, and interface power monitor is immediately to No. one
Loading interfaces, No. two loading interfaces, No. three loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces are entered
Row power monitoring, and monitoring result is uploaded controller, controller is stood after receiving the data transmitted in one to No. five loading interfaces
Calculating process is carried out.If obtained the load in loading interfaces being added in No. six loading interfaces or being added to after calculating
It is most to allow each phase power of electrical network to keep balance in No. six loading interfaces, then just No. one is loaded under the control of the controller
The power supply of interface is switched to C phases from A phases.
The power supply of number loading interfaces is as follows from the handoff procedure that A phases are switched to C phases：
First, shown in Figure 1, it is assumed that before the handover, switch K1 to switch K20, switch K25, switch K26, switch
K27, switch K28, switch K32, switch K33, switch K36, switch K37, switch K40, switch K41 and switch K42 are all in disconnected
Open state, switch K21, switch K22, switch K23, switch K24, switch K29, switch K30, switch K31, switch K34, switch
K35, switch K38 and switch K39 are all in closure state.
Then, A is connected by the switch of a voltage sampling circuit, the voltage letter of a voltage sampling circuit collection A phase
Number and be uploaded to controller.
Then, referring to shown in Fig. 2, Fig. 3, switch K42 closures connect C phases and Single-Phase Inverter Source, and Single-Phase Inverter Source is defeated
The voltage signal for going out using the voltage signal of A phases as reference, the voltage signal using Single-Phase Inverter Source output as feedback signal,
Closed-loop control is constituted, the drive signal of SPWM is produced in the controller, makes the voltage waveform of Single-Phase Inverter Source output filtered
Stable sine-wave power is exported again through isolating transformer after device filtering.Sine-wave power and A phases when isolating transformer output
When voltage is with amplitude same-phase, it is closed at switching K1 and switch K17, and simultaneously switches off switch K39, now loading interfaces
On power supply state or identical with the power supply status in A phases.
Then, shown in Figure 4, controller adopts phase shifting control, makes the voltage waveform of Single-Phase Inverter Source output through filter
Stable sine-wave power is exported again through isolating transformer after the filtering of ripple device.Sine-wave power and C when isolating transformer output
When phase voltage is with amplitude same-phase, switch K1 is disconnected, and be closed at switching K13, now the power supply electricity in loading interfaces
Source state is just completely identical with the power supply status in C phases, i.e., now the power supply of loading interfaces is switched to from A phases
C phases.
Finally switch K42 is disconnected, is bypassed Single-Phase Inverter Source and is exited, so far a Phase-switching end of job.
Other loading interfaces switching principles are identical.
The combination switch fault self-checking principle of the present embodiment is as follows：Participate in shown in Fig. 6, Fig. 7,
When switching combination switch is needed, controller is to reverse-blocking tetrode thyristor KbConductivity control signal is sent, opens controllable silicon
Close KbConducting.Electric current is through reverse-blocking tetrode thyristor Kb, inductance LaWith electric capacity CaClosed-loop path is formed, inductance L is connected in parallel onaThe electric capacity at two ends
C2, diode D1, diode D2, diode D3, diode D4, photoelectrical coupler OPT, resistance R1, resistance R0, resistance R2, from electricity consumption
Supply module and earth terminal SGND together form reverse-blocking tetrode thyristor KbOperation detecting circuit 501.Controllable silicon is flow through in electric current
Switch KbWhen reverse-blocking tetrode thyristor KbOperation detecting circuit can produce start pulse signal, after being kept for certain time, controller to
Magnetic latching relay switchs KcClosure control signal is sent, makes magnetic latching relay switch KcClosure.Magnetic latching relay switchs Kc
By reverse-blocking tetrode thyristor K after closurebWith inductance LaThe series arm of composition is short-circuit, now reverse-blocking tetrode thyristor KbOperation detecting circuit
Trigger pulse will not be produced.Then, controller is to reverse-blocking tetrode thyristor KbDisconnection control signal is sent, reverse-blocking tetrode thyristor K is madebDisconnected
Open, K is switched by magnetic latching relaycKeep current supply circuit work.
When needing to cut off combination switch, controller is to reverse-blocking tetrode thyristor KbConductivity control signal is sent, opens controllable silicon
Close KbConducting, after being kept for certain time, controller switchs K to magnetic latching relaycDisconnection control signal is sent, magnetic keeps relay
Device switchs KcThen turn off, now, controllable silicon operation detecting circuit there will be trigger pulse to occur.Finally, controller is to controllable silicon
Switch KbDisconnection control signal, reverse-blocking tetrode thyristor K are sent againbThen turn off.So far combination switch has just been cut off completely.
The combination switch of the present embodiment possesses, and without the need for multiple
In addition the instrument of detection failure is set in combination switch, so that the structure of combination switch is simpler, small volume, structure reliability,
With low cost, reduce switching unsuccessful potential safety hazard when combination switch is used.
The combination switch of the present embodiment itself switching failure includes reverse-blocking tetrode thyristor KbCannot conducting failure, magnetic keep after
Electric switch KcCannot close failure, magnetic latching relay switch KcCannot disconnect failure and reverse-blocking tetrode thyristor KbCannot
Shut-off failure.Therefore, judge that the method for combination switch itself switching failure includes：
(2-1) judge reverse-blocking tetrode thyristor KbFor cannot the method for conducting failure be：
When combination switch is put into, it is assumed that reverse-blocking tetrode thyristor KbIt is off state, and magnetic latching relay switch KcAlso locate
On the premise of off-state,
(2-1-1) first from controller to reverse-blocking tetrode thyristor KbConductivity control signal is sent, controller waits reverse-blocking tetrode thyristor Kb
Operation detecting circuit return start pulse signal, and carried out with the pulse counter of controller trigger trigger pulse count,
After time delay 0.2s, if the trigger pulse number that controller is received is more than 5, you can think reverse-blocking tetrode thyristor KbCan be just
Often turn on, if the trigger pulse number that controller is received is less than when setting number,
(2-1-2) again from controller to reverse-blocking tetrode thyristor KbConductivity control signal is sent, and pulse counter is reset, then
After secondary time delay 0.2s, if the trigger pulse number that receives of controller is still less than 5, you can judge reverse-blocking tetrode thyristor KbFor
Cannot conducting failure.
(2-2) judge magnetic latching relay switch KcFor the method for failure cannot be closed it is：
When combination switch is put into, it is assumed that reverse-blocking tetrode thyristor KbEnergy normally, and reverse-blocking tetrode thyristor KbShape has been on
State and magnetic latching relay switch KcOn the premise of being off,
(2-2-1) first K is switched from controller to magnetic latching relaycSend closure control signal, and by pulse counter
Reset, after time delay 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number be more than 20 when,
(2-2-2) K is switched from controller to magnetic latching relay againcSend disconnection control signal, and by pulse counter
Reset, then after the time delay 0.6s times, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number more than also 20 when,
(2-2-3) K is switched from controller to magnetic latching relay againcSend closure control signal, and by step-by-step counting
Device resets, again after time delay 0.6s, if now controller receives reverse-blocking tetrode thyristor KbTrigger pulse count still greater than 20
When individual, you can judge magnetic latching relay switch KcFor failure cannot be closed.
(2-3) judge magnetic latching relay switch KcFor the method for failure cannot be disconnected it is：
When combination switch is cut off, it is assumed that reverse-blocking tetrode thyristor KbEnergy normally, and reverse-blocking tetrode thyristor KbIn disconnection shape
State and magnetic latching relay switch KcOn the premise of being in closure state,
(2-3-1) first from controller to reverse-blocking tetrode thyristor KbConductivity control signal is sent by reverse-blocking tetrode thyristor KbConducting, and prolong
When 0.4s relief reverse-blocking tetrode thyristor KbReliable conducting, and K is switched from controller to magnetic latching relaycDisconnection control signal is sent,
And pulse counter is reset, after waiting 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number be less than 20
When individual；
(2-3-2) K is switched from controller to magnetic latching relay againcSend disconnection control signal, and by pulse counter
Reset, after again waiting for 0.6s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number still less than 20 when, you can
Judge magnetic latching relay switch KcFor failure cannot be disconnected.
(2-4) judge reverse-blocking tetrode thyristor KbFor the method for failure cannot be turned off it is：
When combination switch is cut off, it is assumed that magnetic latching relay switchs KcNormally can disconnect, and magnetic latching relay switch Kc
It has been off and reverse-blocking tetrode thyristor KbOn the premise of also in conducting state,
(2-4-1) first from controller to reverse-blocking tetrode thyristor KbShut-off control signal is sent, and pulse counter is reset, prolonged
When 0.2s after, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number be more than 5 when；
(2-4-2) again from controller to reverse-blocking tetrode thyristor KbShut-off control signal is sent, and pulse counter is reset, then
After secondary time delay 0.2s, if controller receives reverse-blocking tetrode thyristor KbTrigger pulse number still greater than 5 when, you can judge controllable
Transwitch KbFor failure cannot be turned off.
Combination switch energy autonomous detection itself the switching failure of the present embodiment, intelligence degree are high, can automatic detection
Itself switching failure, can let the user know that whether combination switch occurs in that failure in time, be easy to replacing in time, and simple structure can
High by property, security is good.
The embodiment of the present utility model above in conjunction with Description of Drawings, but do not limited by above-described embodiment when realizing, this
Field those of ordinary skill can make a variety of changes within the scope of the appended claims or change.
Claims (6)
1. a kind of three-phase and four-line electric energy meter with fault self-checking function, including three-phase and four-line electric energy meter body, three-phase and four-line electricity
Energy table body includes A phase, B phase, C phase, zero line N and three-phase electric energy metering module (110), it is characterised in that also include node J1
With controller (107) and the three-phase equilibrium monitor (101) being connected with controller respectively, voltage sampling circuit (102),
Single-Phase Inverter Source (103), isolating transformer (105), No. two voltage sampling circuits (108) and interface power monitor (109)；
The power output end and isolating transformer of Single-Phase Inverter Source power input connection, node J1 respectively with isolating transformer
The sampling end connection of power output end and No. two voltage sampling circuits, three-phase electric energy metering module are connected with controller；
Also include the switch Ki that control end is connected with controller, wherein i is positive integer, 1≤i≤42；
Also include that node J18, node J14 and node J6, the zero line of node J18 are connected with A, the zero line of node J14 and B
It is connected, the zero line of node J6 is connected with C；The zero line of the zero line side of node J18, the zero line side of node J14 and node J6
End is all connected with zero line N respectively；
The electric energy metrical end of three-phase electric energy metering module, the monitoring side of three-phase equilibrium monitor and a voltage sampling circuit are adopted
Sample end is all connected with node J18, node J14 and node J6 respectively；
The power input of Single-Phase Inverter Source is connected with node J18 by switching K40, the power input of Single-Phase Inverter Source
It is connected with node J14 by switching K41, the power input of Single-Phase Inverter Source is connected with node J6 by switching K42；
Also include that a loading interfaces (201) being connected with the monitoring side of the interface power monitor respectively, No. two loads are connect
Mouth (202), No. three loading interfaces (203), No. four loading interfaces (204), No. five loading interfaces (205) and No. six loading interfaces
(206)；
Also include node J2, node J3, node J4, node J5, node J7, node J8, node J9, node J10, node J11, section
Point J12, node J13, node J15, node J16, node J17 and node J19；
The node J6, switch K13, node J2, switch K14, node J3, switch K15, node J4, switch K16, node J5 and
No. six loading interfaces are sequentially connected in series, the node J6, switch K21, node J7, switch K22, node J8, switch K23, section
Point J9, switch K24, node J10 and No. five loading interfaces are sequentially connected in series, and the node J14, switch K29, node J11, open
Close K30, node J12, switch K31, node J13 and No. four loading interfaces to be sequentially connected in series, the node J14, switch K34,
Node J15, switch K35, node J16 and No. three loading interfaces are sequentially connected in series, the node J18, switch K38, node J17
It is sequentially connected in series with No. two loading interfaces, the node J18, switch K39, node J19 and loading interfaces are sequentially connected in series
Connection；
The node J1, switch K1, node J2, switch K17 and node J19 be sequentially connected in series, the node J1, switch K2,
Node J7, switch K25 and node J19 are sequentially connected in series, the node J1, switch K3, node J11, switch K32 and node
J19 is sequentially connected in series, and the node J1, switch K4, node J15, switch K36 and node J19 are sequentially connected in series, the section
Point J1, switch K5, node J3, switch K18 and node J17 are sequentially connected in series, the node J1, switch K6, node J8, switch
K26 and node J17 are sequentially connected in series, and the node J1, switch K7, node J12, switch K33 and node J17 are sequentially connected in series company
Connect, the node J1, switch K8, node J16, switch K37 and node J17 be sequentially connected in series, the node J1, switch K9,
Node J4, switch K19 and node J16 are sequentially connected in series, the node J1, switch K10, node J9, switch K27 and node
J16 is sequentially connected in series, and the node J1, switch K11, node J5, switch K20 and node J13 are sequentially connected in series, the section
Point J1, switch K12, node J10, switch K28 and node J13 are sequentially connected in series；
The switch K40, switch K41 and pass K42 are the identical combination switch of circuit structure；The combination switch includes
Number node (701), No. two nodes (702), node Msa, node Mb, inductance La, electric capacity Ca, electric capacity C2, diode D1, diode
D2, diode D3, diode D4, photoelectrical coupler OPT, resistance R0, resistance R1, resistance R2, switching switch Ka, Magnetic driving electric power
Road (502), silicon drive circuit (503), from electricity consumption supply module (901) and earth terminal SGND, controller (107) include
Pulse counter (805)；The switching switch KaIncluding reverse-blocking tetrode thyristor KbK is switched with magnetic latching relayc, the smooth thermocouple
Clutch OPT includes light emitting diode D5With phototriode Q0；The reverse-blocking tetrode thyristor KbOne end and magnetic latching relay switch
KcOne end be connected with a node respectively, the reverse-blocking tetrode thyristor KbThe other end, one end of resistance R1 and inductance LaOne end
Respectively with node MaConnection, the inductance LaThe other end, magnetic latching relay switch KcThe other end, one end of resistance R2 and
Electric capacity CaOne end respectively with node MbConnection, the electric capacity CaThe other end be connected on No. two nodes, the other end of resistance R1
With electric capacity C2One end connection, the diode D1Positive terminal and diode D3Negative pole end be connected to electric capacity C2Another
On one end, the diode D2Positive terminal and diode D4Negative pole end be connected to resistance R2The other end on, described two
Pole pipe D1Negative pole end and diode D2Negative pole end be connected to light emitting diode D5Positive terminal on, the diode D3
Positive terminal and diode D4Positive terminal be connected to light emitting diode D5Negative pole end on, the phototriode Q0's
Collector terminal respectively with resistance R0One end and controller connection, the phototriode Q0Emitter stage and signal ground end
SGND connect, described from electricity consumption supply module respectively with resistance R0The other end, Magnetic driving circuit, silicon drive circuit and controller
Connection, the silicon drive circuit respectively with reverse-blocking tetrode thyristor KbControl end and controller connection, Magnetic driving circuit difference
K is switched with magnetic latching relaycControl end and controller connection, when same, in discontinuity surface, a node (701) is only
Can be connected in the wherein phase in A phases, B phases and C phases this three-phases；No. two nodes (702) are connected on zero line N.
2. a kind of three-phase and four-line electric energy meter with fault self-checking function according to claim 1, it is characterised in that also wrap
Include the memory (106) being connected with controller.
3. a kind of three-phase and four-line electric energy meter with fault self-checking function according to claim 1, it is characterised in that also wrap
Filter (104) is included, filter is connected in series in the power input of the power output end and isolating transformer of Single-Phase Inverter Source
On line between end.
4. a kind of three-phase and four-line electric energy meter with fault self-checking function according to claim 1, it is characterised in that isolation
The no-load voltage ratio of transformer is more than 1.17.
5. a kind of three-phase and four-line electric energy meter with fault self-checking function according to claim 1, it is characterised in that also wrap
Include the display (504) being connected with controller.
6. a kind of three-phase and four-line electric energy meter with fault self-checking function according to claim 1, it is characterised in that also wrap
Include the alarm (507) being connected with controller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620988953.8U CN206020648U (en) | 2016-08-30 | 2016-08-30 | A kind of three-phase and four-line electric energy meter with fault self-checking function |
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| CN201620988953.8U CN206020648U (en) | 2016-08-30 | 2016-08-30 | A kind of three-phase and four-line electric energy meter with fault self-checking function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375144A (en) * | 2018-09-18 | 2019-02-22 | 深圳供电局有限公司 | Current loss fault monitoring method and device based on three-phase four-wire meter equipment |
| CN109490815A (en) * | 2018-09-27 | 2019-03-19 | 宁波三星智能电气有限公司 | A kind of three-phase kilowatt-hour meter line detection circuit off zero and its detection method |
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2016
- 2016-08-30 CN CN201620988953.8U patent/CN206020648U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375144A (en) * | 2018-09-18 | 2019-02-22 | 深圳供电局有限公司 | Current loss fault monitoring method and device based on three-phase four-wire meter equipment |
| CN109490815A (en) * | 2018-09-27 | 2019-03-19 | 宁波三星智能电气有限公司 | A kind of three-phase kilowatt-hour meter line detection circuit off zero and its detection method |
| CN109490815B (en) * | 2018-09-27 | 2020-10-27 | 宁波三星智能电气有限公司 | Three-phase ammeter broken zero line detection circuit and detection method thereof |
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