CN106410827B - A kind of phase fault protection circuit of three-phase imbalance regulating device - Google Patents
A kind of phase fault protection circuit of three-phase imbalance regulating device Download PDFInfo
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- CN106410827B CN106410827B CN201610967929.0A CN201610967929A CN106410827B CN 106410827 B CN106410827 B CN 106410827B CN 201610967929 A CN201610967929 A CN 201610967929A CN 106410827 B CN106410827 B CN 106410827B
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- 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
Abstract
The present invention provides a kind of phase fault protection circuit of three-phase imbalance regulating device, it is made of a SCR control signal interlock circuit, a SCR control signal protection circuit for combining magnetic latching relay state and a magnetic latching relay control signal protection circuit.Present invention mainly solves the problem of be: because control signal be interfered, control system operation error, sensor operation error etc. cause control signal false triggering caused by phase fault.The present invention is mainly made of controllable switch device and diode, connect the control circuit and commutation main circuit of three-phase imbalance regulating device, current state in conjunction with commutation main circuit blocks the control signal that may cause phase fault automatically and does not influence normal control signal, can be avoided in commutation main circuit between the magnetic latching relay of different commutation branches, be silicon-controlled between, magnetic latching relay and it is silicon-controlled between phase fault.
Description
Technical field
The present invention relates to low-voltage network three-phase load unbalances to administer field, and in particular to a kind of three-phase imbalance adjusting
The phase fault of device protects circuit.
Background technique
Single-phase load has become the main electric power load of low-voltage network.A large amount of single-phase load is true with randomness and not
Qualitative, the not perfectly flat weighing apparatus of spatial and temporal distributions, the phenomenon that leading to low-voltage network three-phase load unbalance is generally existing.Three-phase imbalance
Cause the electric energy loss of transformer and low-voltage circuit to increase, influences the quality of voltage of low voltage electric network, or even Electrical Safety can be threatened.
For the harm of three-phase imbalance, has some realize alternate switching in the case where not influencing normal power supply at present
Three-phase imbalance regulating device come into operation, this device is mainly made of control circuit and commutation main circuit, principle frame
Figure is as shown in Figure 2.The commutation main circuit of the device by connecing three commutation branch circuit parallel connections in three phase lines of power supply line respectively
Composition, each commutation branch be a pair of silicon-controlled inverse parallel after, it is in parallel with magnetic latching relay；The control circuit of the device is main
It is responsible for receiving magnetic latching relay status feedback signal, acquires the voltage and current of A, B, C three-phase, and into commutation main circuit
Silicon-controlled, magnetic latching relay issues control signal.Current this three-phase imbalance regulating device has come into operation.
This three-phase imbalance regulating device is at least following to control signal: it is corresponding controllable to control A, B, C tri- respectively
The control signal of silicon turn-on and turn-off、、, the control of the corresponding magnetic latching relay of A, B, C tri- conducting is controlled respectively
Signal processed、、, the control signal of the corresponding magnetic latching relay of A, B, C tri- shutdown is controlled respectively、、Deng nine master control signals.Meanwhile this device also at least following feedback signal: A, the corresponding magnetic of B, C tri- is kept
Relay status feedback signal.
The commutation process of this three-phase imbalance regulating device is carried out under the coordination of control circuit, and control circuit connects
It receives after carrying out the commutation instruction at Self-controlled center, the silicon-controlled and magnetic in the current state control commutation main circuit of coupling apparatus is protected
It holds relay and completes a series of switch motion, to realize alternate switching.By taking the alternate switching of C phase to A phase as an example, control electricity
Road, which in time issues control signal, makes commutation main circuit be sequentially completed following movement: conducting C phase be silicon-controlled -> disconnect C phase magnetic guarantor
It is silicon-controlled to hold relay -> shutdown C phase, and -> it is silicon-controlled that A phase is connected -> it is silicon-controlled to be closed A phase magnetic latching relay -> shutdown A phase.
Above-mentioned three-phase imbalance regulating device generally uses phase fault safeguard measure below: control circuit passes through biography
Sensor acquire commutation main circuit running state information, using software analyze handle and issue control signal it is alternate short to prevent
Road.This mode usually can effectively prevent the generation of phase fault.But three-phase imbalance regulating device may be by environment
It is existing that factor interference causes control circuit operation error, the error of sensor return signal, control circuit output signal to be interfered etc.
The case where some phase fault safeguard measures cannot be effectively treated, and then lead to the generation of phase fault.In this A, B, C three-phase
The phase fault that is connected directly by silicon-controlled or magnetic latching relay of two phase lines, three-phase imbalance may be damaged and adjust dress
It sets, endangers power supply line, or even influence the security of the lives and property of electricity consumer.In order to further enhance three-phase imbalance regulating device
Stability and safety, need further to improve three-phase imbalance regulating device on the basis of existing software protection mode
Protection mechanism.
Summary of the invention
There may be the security risk of phase fault, the present invention when being interfered for existing three-phase imbalance regulating device
Purpose be to provide the phase fault protection circuit of three-phase imbalance regulating device a kind of.Phase fault protection provided by the invention
Circuit can combine the current state of magnetic latching relay in the commutation main circuit of three-phase imbalance regulating device, and automatic block can
It can lead to the control signal of phase fault and not influence normal control signal.
The present invention is directed to the three-phase imbalance regulating device with following characteristics: the device includes control circuit and commutation master
Circuit；Wherein commutation main circuit is formed by connecing three commutation branch circuit parallel connections in three phase lines of power supply line respectively, Mei Gehuan
Phase branch be a pair of silicon-controlled inverse parallel after, it is in parallel with magnetic latching relay；The magnetic latching relay have one group of main contacts and
At least one set of feedback contact opposite with main contacts folding condition.
The technical problem to be solved by the present invention is
, which there is the case where phase fault, in this three-phase imbalance regulating device to be divided into following four:
(1) the silicon-controlled and silicon-controlled formation phase fault be connected of this secondary control conducting
(2) the silicon-controlled and magnetic latching relay being closed of this secondary control conducting forms phase fault
(3) magnetic latching relay of this secondary control closure and the silicon-controlled formation phase fault be connected
(4) magnetic latching relay of this secondary control closure forms phase fault with the magnetic latching relay being closed
This three-phase imbalance regulating device is at least following to control signal: it is corresponding controllable to control A, B, C tri- respectively
The control signal of silicon turn-on and turn-off、、, the control of the corresponding magnetic latching relay of A, B, C tri- conducting is controlled respectively
Signal processed、、, the control signal of the corresponding magnetic latching relay of A, B, C tri- shutdown is controlled respectively、、Deng nine master control signals.
Wherein, SCR control signal、、Or the control signal of magnetic latching relay closure、、Error may cause phase fault.Therefore it needs that this six signals are protected, with ensure will not be because two silicon-controlled same
When conducting, two magnetic latching relays simultaneously turn on, the silicon-controlled and magnetic latching relay of different commutation branch simultaneously turns on
Situation causes phase fault.The six control signals exported after phase fault of the present invention protects circuit are respectively as follows:、、、、、。
Wherein, the control signal of magnetic latching relay shutdown、、It will not cause mistake alternate short
Road is only possible to cause of short duration power-off in the not impaired situation of equipment.Control signal error probability is small for these three, does not easily cause
Serious consequence can make equipment resume work by control circuit sending Continuity signal, therefore phase fault of the present invention is protected
Circuit does not protect these three control signals.
In order to achieve the above object, insight of the invention is that
Based on the above analysis, the present invention is from the control signal for preventing the commutation main circuit of three-phase imbalance regulating device from receiving
The magnetic latching relay for silicon-controlled or this secondary control closure that error causes this secondary control to be connected be connected before this it is silicon-controlled
Or the angle of phase fault is formed between the magnetic latching relay being closed before this, any may cause can be blocked by providing one kind
The circuit of the control signal of phase fault.
The input terminal and the three-phase imbalance of the phase fault protection circuit of this three-phase imbalance regulating device are adjusted and are filled
The control circuit connection set, receives the control signal of control circuit；The feedback contact of centre access magnetic latching relay；Output section
The commutation main circuit for dividing connection three-phase imbalance regulating device, to the control signal of its output safety.
The phase fault protection circuit of this three-phase imbalance regulating device is mainly by the controllable switches such as metal-oxide-semiconductor device, two poles
The composition such as pipe, DC power supply.The power supply and the DC power supply of the control circuit of the three-phase imbalance regulating device are total
The positive voltage of ground, the voltage of the DC power supply and three-phase imbalance regulating device control signal can suitably be chosen higher
Voltage, to enhance the anti-interference ability of control signal.
To realize above-mentioned design, the technical solution adopted by the present invention is that:
As shown in Figure 3 and Figure 4, a kind of phase fault protection circuit of three-phase imbalance regulating device of the present invention includes one
SCR control signal interlock circuit, a SCR control signal protection circuit for combining magnetic latching relay state and one
Magnetic latching relay controls signal protection circuit.The combined magnetic latching relay state of SCR control signal interlock circuit
SCR control signal protection circuit connection magnetic latching relay control signal protection circuit, SCR control signal interlocking electricity
The control circuit of the input terminal connection three-phase imbalance regulating device on road, and magnetic latching relay control signal protection circuit is defeated
The commutation main circuit of outlet connection three-phase imbalance regulating device.This phase fault protection circuit is for blocking three-phase imbalance tune
The abnormal control signal of the control circuit output of regulating device, wherein SCR control signal interlock circuit ensures to protect through the present invention
Protection circuit protection after the same time at most export one controlled silicon conducting signal, using in conjunction with magnetic latching relay state can
Ensure that the silicon-controlled of this secondary control conducting will not be protected with the silicon-controlled or magnetic be connected after control silicon control signal protection circuit protection
It holds relay and forms phase fault, after controlling signal protection circuit protection using magnetic latching relay, it is ensured that this secondary control is led
Logical magnetic latching relay silicon-controlled will not form phase fault with the silicon-controlled or magnetic latching relay be connected.Three-phase is not
The corresponding silicon-controlled on-off of A, B, C tri- of the control circuit output of balance regulator controls signal、、And A,
B, the control signal of the corresponding magnetic latching relay of C tri- conducting、、It is protected by this phase fault protection circuit
To the corresponding silicon-controlled on-off control letter of A, B, C tri- of the commutation main circuit output safety of three-phase imbalance regulating device after shield
Number、、And the control signal of the corresponding magnetic latching relay of A, B, C tri- conducting、、。
Above-mentioned SCR control signal interlock circuit is made of three controllable switch devices SV1, SV2, SV3.Controllable switch
The control terminal of device SV1, SV2, SV3 are respectively connected to、、Signal wire；The one of controllable switch device SV1, SV2, SV3
A contact is respectively connected to、、Signal wire, another contact are respectively connected to、、Signal wire.Controllable switch
Device SV1, SV2, SV3 shutdown when its control terminal receives controlled silicon conducting signal do not receive controlled silicon conducting in its control terminal
It is connected when signal.
This partial circuit is to ensure that at most the silicon-controlled of only one commutation branch of same time receives Continuity signal.WhenWhen for Continuity signal, SV2 is off state,Signal is blocked, thereforeIt must not be Continuity signal, similarly, whenWhen for Continuity signalIt must not be Continuity signal, whenWhen for Continuity signalIt must not be Continuity signal.This part
The corresponding output Continuity signal of all possible input Continuity signal of circuit is as shown in table 1, it can be seen that this part protection
Circuit may insure that the same time at most only exports controlled silicon conducting signal all the way.
The SCR control signal protection circuit of above-mentioned combination magnetic latching relay state includes: six controllable switch devices
SV4, SV5, SV6, SV7, SV8, SV9, three diodes D1, D2, D3, magnetic latching relay is anti-in three-phase imbalance regulating device
Present contact Ka, Kb, Kc and DC power supply DC.The control terminal access of controllable switch device SV4 and SV7, SV5 and SV8, SV6 and SV9、、Signal wire；DC power supply DC anode, controllable switch device SV4, feedback contact Kb, diode D2, feedback touching
Point Kc, controllable switch device SV7,Signal wire successively joins end to end；It is DC power supply DC anode, controllable switch device SV5, anti-
Present contact Kc, diode D3, feedback contact Ka, controllable switch device SV8,Signal wire successively joins end to end；DC power supply
DC anode, controllable switch device SV6, feedback contact Ka, diode D1, feedback contact Kb, controllable switch device SV9,Signal
Line successively joins end to end.Controllable switch device SV4, SV5, SV6, SV7, SV8, SV9 receives controlled silicon conducting letter in its control terminal
Number when be connected, the shutdown when its control terminal does not receive controlled silicon conducting signal.
This partial circuit may cause the silicon-controlled of phase fault to lead to block with the magnetic latching relay being closed
Messenger.Only whenFor Continuity signal and in the case that B, C phase magnetic latching relay all disconnectExport Continuity signal；
Only whenFor Continuity signal and in the case that A, C phase magnetic latching relay all disconnectOutput is Continuity signal；Only whenFor Continuity signal and in the case that A, B phase magnetic latching relay all disconnectOutput is Continuity signal.
Above-mentioned magnetic latching relay control signal protection circuit is mainly by three controllable switch devices SV10, SV11, SV12
Composition, controllable switch device SV10, SV11, SV12 control terminal are respectively connected to、、Signal wire；Controllable switch device
A contact of SV10, SV11, SV12 are respectively connected to、、Signal wire, another contact are respectively connected to、、Signal wire.Controllable switch device SV10, SV11, SV12 is led when its control terminal receives magnetic latching relay closure signal
It is logical, the shutdown when its control terminal does not receive magnetic latching relay closure signal.
The magnetic latching relay of silicon-controlled place commutation branch of this partial circuit to ensure only to receive Continuity signal
It can be connected.By taking A phase as an example, if A phase SCR control signalFor Continuity signal, then the silicon-controlled of B, C phase must not at this time
It will receive what the magnetic latching relay of Continuity signal and B, C phase was off, it is safe that A phase magnetic latching relay is connected at this time.
Three above-mentioned parts form the phase fault protection circuit of complete three-phase imbalance regulating device, can be realized
The purpose of the present invention.
It should be pointed out that the protection circuit requirement makes the conducting of certain magnetic latching relay that must first make its place commutation branch
Controlled silicon conducting.Therefore the existing three-phase imbalance regulating device in part needs to control it to use present invention protection circuit
The control algolithm of circuit processed slightly adjusts, the state which only all disconnects in all silicon-controlled, magnetic latching relays of the device
It is lower just to enable, adjustment is not necessarily to the algorithm of three-phase imbalance regulating device normal commutation work, does not influence its whole control strategy.
A kind of phase fault protection circuit of three-phase imbalance regulating device of the present invention is for blocking three-phase imbalance to adjust
The commutation main circuit of device receives the error control signal that may cause phase fault, and the work of the circuit comprises the steps of:
(1) when in three commutation branches of the commutation main circuit of three-phase imbalance regulating device there are two or it is more than two controllable
When silicon has Continuity signal, excessive controlled silicon conducting signal is blocked, it is ensured that most the silicon-controlled of only one commutation branch are led
Messenger, the silicon-controlled and silicon-controlled formation phase fault be connected for avoiding this secondary control from being connected；
(2) there is Continuity signal and other commutation branches have magnetic latching relay to be closed when a certain commutation branch is silicon-controlled
When, the controlled silicon conducting signal is blocked, the silicon-controlled and magnetic latching relay being closed for avoiding this secondary control from being connected forms phase
Between short circuit；
(3) only allow the magnetic latching relay for meeting following conditions closure control signal to pass through, block the magnetic of other situations
Guard relay closure control signal: after step (1) (2) protection, commutation branch is silicon-controlled where the magnetic latching relay
There is Continuity signal.The magnetic latching relay that the step avoids this secondary control from being closed forms alternate with the magnetic latching relay being closed
The magnetic latching relay that short circuit, this secondary control are closed and the silicon-controlled formation phase fault be connected.
Circuit of the present invention is used for existing three-phase imbalance regulating device, have following substantive distinguishing features outstanding and
Significant technological progress:
1, circuit design of the present invention is exquisite, and common device can be selected, easy to accomplish, and circuit itself have it is stronger
Anti-interference ability.
2, the present invention is applied to existing three-phase imbalance regulating device, can block the control that may cause phase fault automatically
Signal processed increases by a heavy hardware protection measure on the basis of not influencing device original software protection so that equipment by
The safety problems such as phase fault are still not susceptible under the fault conditions such as strong jamming, control system operation error, sensor error.This
Invention circuit is comprehensive to control signal protection, issues any error control signal in the control circuit of three-phase imbalance regulating device
In the case where, this circuit will not all export the control that may cause phase fault to the commutation main circuit of three-phase imbalance regulating device
Signal processed.
3, the present invention can be used for partially having produced or having had been put into the three-phase imbalance regulating device used.For partially
Production or the three-phase imbalance regulating device to have come into operation, control circuit are usually to separate and use conducting wire with commutation main circuit
It connects, only needing to reconnect conducting wire after addition circuit of the present invention can work normally, and change when necessary in conjunction with specific equipment increase
The circuit of varying signal voltage, the subprogram for modifying controller.Also it can be directly integrated on new equipment.
Detailed description of the invention
Fig. 1 is the three-phase imbalance regulating device functional block diagram with phase fault protection circuit
Fig. 2 is a kind of existing three-phase imbalance regulating device functional block diagram
Fig. 3 is the phase fault protection circuit block diagram of three-phase imbalance regulating device of the present invention
Fig. 4 is the phase fault protection circuit diagram of three-phase imbalance regulating device of the present invention
Fig. 5 is the phase fault protection circuit diagram of the three-phase imbalance regulating device of one embodiment of the invention
Fig. 6 is the three-phase imbalance regulating device block diagram with phase fault protection circuit of one embodiment of the invention
Fig. 7 is the magnetic latching relay state-feedback circuit schematic diagram of one embodiment of the invention.
Specific embodiment
The preferred embodiment of the present invention is described further with reference to the accompanying drawing.
Embodiment one:
As shown in figures 1 and 3, the phase fault protection circuit of three-phase imbalance regulating device includes three in the present embodiment
Part: SCR control signal interlock circuit, the SCR control signal protection circuit in conjunction with magnetic latching relay state, magnetic are protected
Hold relay control signal protection circuit.The combined magnetic latching relay state of SCR control signal interlock circuit it is silicon-controlled
It controls signal protection circuit connection magnetic latching relay and controls signal protection circuit, the input of SCR control signal interlock circuit
The control circuit of end connection three-phase imbalance regulating device, and the output end connection of magnetic latching relay control signal protection circuit
The commutation main circuit of three-phase imbalance regulating device.
The present embodiment phase fault protection circuit is different for blocking the control circuit of three-phase imbalance regulating device to export
Often control signal, wherein SCR control signal interlock circuit ensures that the same time is most after the present invention protects circuit protection
A controlled silicon conducting signal is exported, using the SCR control signal protection circuit protection for combining magnetic latching relay state
Ensure that the silicon-controlled of this secondary control conducting will not form phase fault with the silicon-controlled or magnetic latching relay be connected afterwards, then passes through
Cross magnetic latching relay control signal protection circuit protection after, it is ensured that this secondary control conducting magnetic latching relay or it is silicon-controlled not
Phase fault can be formed with the silicon-controlled or magnetic latching relay be connected.The control circuit of three-phase imbalance regulating device exports
The corresponding silicon-controlled on-off of A, B, C tri- control signal、、And the corresponding magnetic latching relay of A, B, C tri-
The control signal of conducting、、To three-phase imbalance regulating device after this phase fault protects circuit protection
The corresponding silicon-controlled on-off of A, B, C tri- of commutation main circuit output safety controls signal、、And A, B, C three-phase
The control signal of corresponding magnetic latching relay conducting、、。
The normal commutation process of three-phase imbalance regulating device is (by taking the alternate switching of C phase to A phase as an example):
(1) when original state, C phase magnetic latching relay is in closed state, and user is powered by C phase.
(2) control module successively trigger C phase it is silicon-controlled, disconnect C phase magnetic latching relay, at this moment C phase current through C phase can
Control silicon continues as customer power supply.
(3) for control module according to the feedback signal of magnetic latching relay feed circuit, stopping triggering C phase is silicon-controlled, triggers A
It is mutually silicon-controlled, make C phase is silicon-controlled to bear reversed anode voltage to make it be forced shutdown, it is silicon-controlled that electric current flows through A phase.
(4) the magnetic latching relay closure of control module control A phase, stopping triggering A phase is silicon-controlled, the silicon-controlled pass of A phase
Disconnected, magnetic latching relay of the electric current through A phase, this commutation process terminates.
When the sending of the control circuit of three-phase imbalance regulating device may cause the abnormal control signal of phase fault, this
Embodiment protects circuit to play blocking effect:
(1) when this secondary control conducting it is silicon-controlled may be connected silicon-controlled formation phase fault when, i.e., this
When controlled silicon conducting signal has multiple, silicon-controlled signal is after the silicon-controlled interlock circuit of the present embodiment protection circuit, excessively
Continuity signal can be blocked, the final same time at most only exports a controlled silicon conducting signal, to avoid this secondary control
The silicon-controlled and silicon-controlled formation phase fault be connected of conducting.
(2) when this secondary control conducting silicon-controlled may form phase fault with the magnetic latching relay that has been closed, warp
After crossing the SCR control signal protection circuit of the combination magnetic latching relay state of the present embodiment protection circuit, this is silicon-controlled
Continuity signal can be blocked, thus avoid this secondary control be connected it is silicon-controlled formed with the magnetic latching relay being closed it is alternate short
Road.
(3) when this secondary control closure magnetic latching relay may be connected silicon-controlled formation phase fault when, warp
Cross the magnetic latching relay control silicon-controlled magnetic for not turning on commutation branch of signal protection circuit blocks of the present embodiment protection circuit
The magnetic latching relay of guard relay closure signal, i.e., the only silicon-controlled commutation branch be connected can be closed, it is clear that can be with
The magnetic latching relay for avoiding this secondary control from being closed and the silicon-controlled formation phase fault be connected.
(4) when the magnetic latching relay of this secondary control closure may form phase fault with the magnetic latching relay being closed
When, by the magnetic latching relay control of the present embodiment protection circuit, signal protection circuit blocks are silicon-controlled does not turn on commutation branch
Magnetic latching relay closure signal, i.e., the magnetic latching relay of the only silicon-controlled commutation branch be connected can be closed, due to
It must be to disconnect with the magnetic latching relay of silicon-controlled out of phase commutation branch that has been connected after above-mentioned (1) (2) (3) step
State, so that the magnetic latching relay for avoiding this secondary control from being closed forms phase fault with the magnetic latching relay being closed.
Embodiment two:
The present embodiment is basically the same as the first embodiment, and special feature is as follows:
As shown in figure 5, there is the phase fault protection circuit input signal of three-phase imbalance regulating device in the present embodiment:、、、、、, high level is 18V relative to ground.Wherein、、To control respectively
A, the control signal of tri- corresponding controlled silicon conducting (high level) of B, C and shutdown (low level)；、、For respectively
Control the control signal of the corresponding magnetic latching relay of A, B, C tri- closure (high level).
There is phase fault protection circuit output signal in the present embodiment:、、、、、, high
Level is about 12V relative to ground, practical to consider the pressure drops such as diode, metal-oxide-semiconductor, and high level voltage is less than 12V.These output letters
Number have stronger driving capability, the control coil of optocoupler and magnetic latching relay can be directly connected to.Wherein、、To control tri- corresponding controlled silicon conducting (high level) of A, B, C respectively and turning off the control signal of (low level)；、、To control the control signal that the corresponding magnetic latching relay of A, B, C tri- is closed (high level) respectively.
Q1, Q2, Q3 are three P-channel metal-oxide-semiconductors in SCR control signal interlock circuit described in the present embodiment.、、It is separately connected the source electrode of Q1, Q2, Q3, while being separately connected the grid of Q2, Q3, Q1.、、On all connect one
10k Ω pull down resistor R1, R2, R3.The drain electrode of Q1, Q2, Q3 are the output signal of our department's parallel circuit、、。
Described in the present embodiment in conjunction with magnetic latching relay state SCR control signal protection circuit in Q4, Q5, Q6,
Q7, Q8, Q9 are six N-channel MOS pipes, and D1, D2, D3 are three diodes, and Ka, Kb, Kc are that the feedback of magnetic latching relay is touched
Point.The grid of Q4, Q7 are connected,The grid of Q5, Q8 are connected,Connect the grid of Q6, Q9.DC power supply DC anode,
Metal-oxide-semiconductor Q4, feedback contact Kb, diode D2, feedback contact Kc, metal-oxide-semiconductor Q7,Signal wire successively joins end to end；Direct current
Source DC anode, metal-oxide-semiconductor Q5, feedback contact Kc, diode D3, feedback contact Ka, metal-oxide-semiconductor Q8,Signal wire successively head and the tail phase
Even；DC power supply DC anode, metal-oxide-semiconductor Q6, feedback contact Ka, diode D1, feedback contact Kb, metal-oxide-semiconductor Q9,Signal wire according to
It is secondary to join end to end.Wherein the anode of the drain electrode connection 12V DC power supply of Q4, Q5, Q6, the drain electrode of Q7, Q8, Q9 are separately connected feedback
Contact Kb, Kc, Ka.、、All meet 10k Ω pull down resistor R4, R5, a R6.When Kb, Kc closure andTo lead
When messenger (high level), the conducting of metal-oxide-semiconductor Q4, Q7 drain-source, 12V positive pole, metal-oxide-semiconductor Q4, feedback contact Kb, diode
D2, feedback contact Kc, metal-oxide-semiconductor Q7 constitute forward path, and end output is；When Kc, Ka closure andFor Continuity signal
When (high level), the conducting of metal-oxide-semiconductor Q5, Q8 drain-source is 12V positive pole, metal-oxide-semiconductor Q5, feedback contact Kc, diode D3, anti-
It presents contact Ka, metal-oxide-semiconductor Q8 and constitutes forward path, end output is；When Ka, Kb closure andFor Continuity signal (high electricity
It is flat) when, the conducting of metal-oxide-semiconductor Q6, Q9 drain-source, 12V positive pole, metal-oxide-semiconductor Q6, feedback contact Ka, diode D1, feedback contact
Kb, metal-oxide-semiconductor Q9 constitute forward path, and end output is。
It is three N-channel MOSs that magnetic latching relay described in the present embodiment, which controls Q10, Q11, Q12 in signal protection circuit,
Pipe.、、It is separately connected the grid of Q10, Q11, Q12,、、It is separately connected the leakage of Q10, Q11, Q12
Pole, the source electrode of Q10, Q11, Q12 are this part circuit output signal、、；、、Signal wire difference
Meet 10k Ω pull down resistor R7, R8, a R9.
As shown in fig. 6, the three-phase imbalance regulating device with phase fault protection circuit is mainly adjusted by three-phase imbalance
The control circuit of device, the phase fault protection circuit of above-mentioned three-phase imbalance regulating device, three-phase imbalance regulating device
Commutation main circuit, magnetic latching relay state-feedback circuit are constituted.
What the control circuit of the three-phase imbalance regulating device issued、、、、、Signal warp
The three-phase imbalance regulating device is passed to after the phase fault protection processing of circuit of the three-phase imbalance regulating device
Commutation main circuit；What the control circuit of the three-phase imbalance regulating device issued、、It is directly passed to described
The commutation main circuit of three-phase imbalance regulating device；In the commutation main circuit of the three-phase imbalance regulating device magnetic keep after
Electric appliance includes two groups of folding conditions feedback contact opposite with main contacts；The magnetic latching relay state-feedback circuit utilizes magnetic
One group of feedback contact of guard relay feeds back three magnetic latching relays to the control circuit of the three-phase imbalance regulating device
Switch state, while six terminals of another group of feedback contact of three magnetic latching relays are accessed into the three-phase imbalance tune
The phase fault of regulating device protects circuit.
Embodiment three:
The magnetic latching relay of the commutation main circuit of three-phase imbalance regulating device in embodiment two need to have two groups of foldings
The state feedback contact opposite with main contacts, if the feedback touching that magnetic latching relay only has one group of folding condition opposite with main contacts
Point can realize the function of embodiment two by following circuits.
As shown in fig. 7, Ka, Kb, Kc are magnetic latching relay in magnetic latching relay state-feedback circuit in the present embodiment
Feedback contact, R10, R11, R12, R13, R14, R15 be six 50k Ω resistance.Referring to diagram direction, the upper end of Ka, Kb, Kc
12V DC positive pole is connect via R10, R11, R12 respectively, the lower end of Ka, Kb, Kc are grounded via R13, R14, R15 respectively.
Feedback signal of the lower end of Ka, Kb, Kc respectively as the control circuit to three-phase imbalance regulating device, the upper end of Ka, Kb, Kc
The SCR control signal protection circuit that magnetic latching relay state is combined described in the present embodiment is all accessed with lower end.Feedback electricity
Road can not only feed back the switch state of three magnetic latching relays to the control circuit of three-phase imbalance regulating device, but also can incite somebody to action
Three magnetic latching relay feedback contacts access the protection circuit of the present embodiment, and the two function is not interfere with each other.
Above-mentioned magnetic latching relay state-feedback circuit feeds back three magnetic to the control circuit of three-phase imbalance regulating device
When the switch state of guard relay, it is divided into following two situation:
(1) when SCR control signal、、When not being Continuity signal, if the magnetic of certain commutation branch is kept
Relay closure, i.e. its feedback contact disconnect, and feedback signal voltage is about 0.3V；If the magnetic latching relay of certain commutation branch is disconnected
It opens, i.e., its feedback contact is closed, and feedback signal voltage is about 6V.
(2) when SCR control signal、、In one when being Continuity signal, if the magnetic of certain commutation branch is protected
Relay closure is held, i.e. its feedback contact disconnects, and feedback signal voltage is about 0.3V；If the magnetic latching relay of certain commutation branch
It disconnects, i.e., its feedback contact is closed, and feedback signal voltage is about 10V.Due in this case, when normal operation, leads without silicon-controlled
The magnetic latching relay of the commutation branch of messenger must be off-state, at this time the only commutation branch of controlled silicon conducting signal
Feedback signal is of practical significance.
It is to sum up told, when the magnetic latching relay of certain commutation branch closure, feedback signal voltage is about 0.3V；When certain
When the magnetic latching relay of commutation branch disconnects, feedback signal voltage is more than or equal to 6V.It is 1V and 4V that threshold voltage, which may be selected,
The magnetic latching relay that this commutation branch is then thought when feedback signal voltage is greater than 4V is off-state, works as feedback signal voltage
The magnetic latching relay that this commutation branch is then thought when less than 1V is closed state, is abnormal shape when voltage is between 1-4V
State.
Claims (5)
1. a kind of phase fault of three-phase imbalance regulating device protects circuit, including a SCR control signal interlock circuit
(3-1), SCR control signal protection circuit (3-2) and a magnetic latching relay in conjunction with magnetic latching relay state
It controls signal protection circuit (3-3), it is characterised in that: the combined magnetic of SCR control signal interlock circuit (3-1) is kept
SCR control signal protection circuit (3-2) connection magnetic latching relay control signal protection circuit (3-3) of relay status,
The control circuit (1) of the input terminal connection three-phase imbalance regulating device of SCR control signal interlock circuit (3-1), and magnetic is protected
Hold the commutation main circuit (2) of the output end connection three-phase imbalance regulating device of relay control signal protection circuit (3-3)；Three
Mutually the corresponding silicon-controlled on-off of A, B, C tri- of control circuit (1) output of uneven regulating device controls signal PTa、PTb、PTc
And the control signal P of the corresponding magnetic latching relay of A, B, C tri- conductingKa、PKb、PKcCircuit (3) are protected by this phase fault
To the corresponding silicon-controlled on-off of A, B, C tri- of commutation main circuit (2) output safety of three-phase imbalance regulating device after protection
Control signal QTa、QTb、QTcAnd the corresponding magnetic latching relay conductivity control signal Q of A, B, C tri-Ka、QKb、QKc；This is alternate short
Road protection circuit (3) is used to block the abnormal control signal of circuit (1) output of the control of three-phase imbalance regulating device, wherein
SCR control signal interlock circuit (3-1) ensures that the same time at most exports a controlled silicon conducting after protecting circuit protection
Signal ensures this secondary control after protecting using the SCR control signal protection circuit (3-2) of combination magnetic latching relay state
The silicon-controlled of system conducting will not form phase fault with the silicon-controlled or magnetic latching relay be connected, keep relay using magnetic
Device control signal protection circuit (3-3) protection after, it is ensured that this secondary control conducting magnetic latching relay or it is silicon-controlled will not with
The silicon-controlled or magnetic latching relay of conducting forms phase fault.
2. the phase fault of three-phase imbalance regulating device according to claim 1 protects circuit, it is characterised in that: described
SCR control signal interlock circuit (3-1) be made of three controllable switch devices SV1, SV2, SV3, controllable switch device
The control terminal of SV1, SV2, SV3 meet P respectivelyTc、PTa、PTbSignal wire；A contact of controllable switch device SV1, SV2, SV3 point
It Jie Ru not PTa、PTb、PTcSignal wire, the other end export the SCR control signal Q ' after interlock protectionTa、Q′Tb、Q′Tc。
3. the phase fault of three-phase imbalance regulating device according to claim 1 protects circuit, it is characterised in that: described
Combination magnetic latching relay state SCR control signal protection circuit (3-2) include: six controllable switch device SV4,
Magnetic in SV5, SV6, SV7, SV8, SV9, three diodes D1, D2, D3, DC power supply DC and three-phase imbalance regulating device
Feedback contact Ka, Kb, Kc opposite with its main contacts folding condition of guard relay；Controllable switch device SV4 and SV7, SV5
Q ' is met respectively with the control terminal of SV8, SV6 and SV9Ta、Q′Tb、Q′TcSignal wire；DC power supply DC anode, controllable switch device
SV4, feedback contact Kb, diode D2, feedback contact Kc, controllable switch device SV7, QTaSignal wire successively joins end to end；Direct current
Power supply DC anode, controllable switch device SV5, feedback contact Kc, diode D3, feedback contact Ka, controllable switch device SV8, QTb
Signal wire successively joins end to end；DC power supply DC anode, controllable switch device SV6, feedback contact Ka, diode D1, feedback touching
Point Kb, controllable switch device SV9, QTcSignal wire successively joins end to end.
4. the phase fault of three-phase imbalance regulating device according to claim 1 protects circuit, it is characterised in that: described
Magnetic latching relay control signal protection circuit (3-3) be made of three controllable switch devices SV10, SV11, SV12, controllably
Switching device SV10, SV11, SV12 control terminal meets P respectivelyKa、PKb、PKcSignal wire；Controllable switch device SV10, SV11, SV12
One contact meets Q respectivelyTa、QTb、QTcSignal wire, another contact meet Q respectivelyKa、QKb、QKcSignal wire.
5. the phase fault of the three-phase imbalance regulating device according to any one of claim 2-4 protects circuit,
Be characterized in that: the SCR control signal interlock circuit (3-1) is made of three controllable switch devices SV1, SV2, SV3,
The control terminal of controllable switch device SV1, SV2, SV3 meet P respectivelyTc、PTa、PTbSignal wire；Controllable switch device SV1, SV2, SV3
A contact be respectively connected to PTa、PTb、PTcSignal wire, the other end export the SCR control signal Q ' after interlock protectionTa、
Q′Tb、Q′Tc；The SCR control signal protection circuit (3-2) of the combination magnetic latching relay state includes: six controllable
Switching device SV4, SV5, SV6, SV7, SV8, SV9, three diodes D1, D2, D3, DC power supply DC and three-phase imbalance
Feedback contact Ka, Kb, Kc opposite with its main contacts folding condition of magnetic latching relay in regulating device；Controllable switch device
SV4 and SV7, SV5 and SV8, SV6 and SV9 control terminal meet Q ' respectivelyTa、Q′Tb、Q′TcSignal wire；DC power supply DC anode, can
Control switching device SV4, feedback contact Kb, diode D2, feedback contact Kc, controllable switch device SV7, QTaSignal wire successively head and the tail
It is connected；DC power supply DC anode, controllable switch device SV5, feedback contact Kc, diode D3, feedback contact Ka, controllable switch device
Part SV8, QTbSignal wire successively joins end to end；DC power supply DC anode, controllable switch device SV6, feedback contact Ka, diode
D1, feedback contact Kb, controllable switch device SV9, QTcSignal wire successively joins end to end；The magnetic latching relay controls signal
Protection circuit (3-3) is made of three controllable switch devices SV10, SV11, SV12, controllable switch device SV10, SV11, SV12
Control terminal meets P respectivelyKa、PKb、PKcSignal wire；Mono- contact controllable switch device SV10, SV11, SV12 meets Q respectivelyTa、QTb、QTc
Signal wire, another contact meet Q respectivelyKa、QKb、QKcSignal wire；Described controllable switch device SV1, SV2, the SV3 is in its control terminal
Shutdown when receiving controlled silicon conducting signal, the conducting when its control terminal does not receive controlled silicon conducting signal；The controllable switch
Device SV4, SV5, SV6, SV7, SV8, SV9 conducting when its control terminal receives controlled silicon conducting signal are not received in its control terminal
It is turned off when to controlled silicon conducting signal；Described controllable switch device SV10, SV11, the SV12 its control terminal receive magnetic keep after
It is connected when electric appliance closure signal, the shutdown when its control terminal does not receive magnetic latching relay closure signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545826A (en) * | 2012-07-09 | 2014-01-29 | 江西龙跃电子科技有限公司 | Intelligent low-voltage power load distribution system and method |
| CN203645584U (en) * | 2013-12-25 | 2014-06-11 | 南京科远控制工程有限公司 | Positive-negative rotating control circuit of three-phase AC motor |
| JP2016184999A (en) * | 2015-03-25 | 2016-10-20 | 中国電力株式会社 | Connection phase determination method and connection phase determination device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545826A (en) * | 2012-07-09 | 2014-01-29 | 江西龙跃电子科技有限公司 | Intelligent low-voltage power load distribution system and method |
| CN203645584U (en) * | 2013-12-25 | 2014-06-11 | 南京科远控制工程有限公司 | Positive-negative rotating control circuit of three-phase AC motor |
| JP2016184999A (en) * | 2015-03-25 | 2016-10-20 | 中国電力株式会社 | Connection phase determination method and connection phase determination device |
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