CN106385020A - Quasi-zero transient switching damping resistor controller - Google Patents
Quasi-zero transient switching damping resistor controller Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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Abstract
The invention discloses a quasi-zero transient switching damping resistor controller which comprises a voltage transformer, a control circuit, a bidirectional silicon controlled rectifier loop and a current transformer, wherein the control circuit comprises a voltage reduction and adaption circuit, a rectification filter circuit, a phase shift shaping circuit, a zero-crossing comparison circuit, a controller, an amplification circuit and a driving isolation circuit. The voltage reduction and adaption circuit is respectively connected with the rectification filter circuit and the phase shift shaping circuit, the phase shift shaping circuit is connected with the zero-crossing comparison circuit, and the other ends of the rectification filter circuit and the zero-crossing comparison circuit access to the controller. The controller, the amplification circuit, the driving isolation circuit and the bidirectional silicon controlled rectifier loop are sequentially connected in series. The bidirectional silicon controlled rectifier loop is connected in parallel to the two ends of a damping resistor, one end of the current transformer is grounded, and the other end of the current transformer is connected with one end of the damping resistor. The voltage reduction and adaption circuit is further connected with the voltage transformer, and the voltage transformer is connected with the neutral point of a power distribution network. The quasi-zero transient switching damping resistor controller realizes quasi-zero transient transition process for arc extinguishing coil compensation current when a system fails, thereby effectively reducing the influence of a transient process caused by rapid switching of a damping resistor on residual current and residual current time.
Description
Technical field
The present invention relates to a kind of bidirectional triode thyristor switching damping resistance technology, specifically accurate zero transient state switching resistance
Buffer resistance control device.
Background technology
Neutral by arc extinction coil grounding is to administer one of effective ways of In the distribution system of low voltage singlephase earth fault, its
In with presetting system adjust circle arc suppression coil be most widely used.Presetting system is adjusted circle arc suppression coil to typically require and is connected one between the earth
Individual damping resistance is less than the 15% of phase voltage with neutral point displacement voltage when ensureing that electrical network normally runs, but single-phase connecing is occurring
Rapid damping resistance of excising is needed to realize effective compensation during earth fault.Traditional method is to excise resistance using load loaded switch
Buffer resistance, load loaded switch structure bulky and poor reliability；Prior art drives bidirectional triode thyristor to cut using from triggering technique
Except damping resistance.If Fig. 1 is the circuit diagram of prior art thyristor throw-cut series damping resistor, circuit comprises damping resistance R, double
To controllable silicon T1-T2, varistor RV, counnter attack diode D1～D4.Although prior art improves damp resistance throw-cut speed
With reliability, but it was found that because it is from triggering mode, damping resistance quick-switching in the specific implementation process of technology
The transient process being caused causes significant impact to arc suppression coil residual flow and residual flow time under extreme operating condition, has had a strong impact on and has disappeared
The performance of camber line coil apparatus and quality.
Content of the invention
The invention aims to solution above-mentioned technical problem, a kind of accurate zero transient state bidirectional triode thyristor throwing of present invention offer
Cut damping resistance control technology.This invention adds phase shift shaping circuit and Zero-cross comparator circuit real-time monitoring bidirectional triode thyristor synchronous
Voltage status, current rectifying and wave filtering circuit is used for measuring the neutral point voltage U of distribution systemo, and electric with the reference in controller
Pressure Uref(Uref=15%UA) make comparisons.If there is singlephase earth fault and Uo＞ Uref, then phase shift shaping circuit and Zero-cross comparator
Circuit cooperation controller produces in good time bidirectional triode thyristor trigger pulse, controls controlled silicon conducting, realizes the excision of damping resistance, reason
Substantially zero transient state can be accomplished, controller can be implemented using analog or digital control technology under the conditions of thinking.The enforcement of this technology can
Eliminate traditional adverse effect to arc suppression coil device for the turn-adjusting arc-extinguishing winding damp resistance throw-cut transient process with effective, and show
Write the quality improving arc suppression coil compensation device.
The technical scheme is that：
A kind of accurate zero transient state switching damping resistance control device, the composition of this device comprises：Voltage transformer, control electricity
Road, bidirectional triode thyristor loop summation current transformer；
Wherein, the composition of described control circuit includes：Blood pressure lowering adapter circuit, current rectifying and wave filtering circuit, phase shift shaping circuit,
Zero-cross comparator circuit, controller, amplifying circuit and driving isolation circuit；Blood pressure lowering adapter circuit respectively with current rectifying and wave filtering circuit, shifting
Phase shaping circuit be connected, phase shift shaping circuit is connected with Zero-cross comparator circuit, current rectifying and wave filtering circuit, Zero-cross comparator circuit another
End is respectively connected to controller again；Controller, amplifying circuit, driving isolation circuit, bidirectional triode thyristor loop are sequentially connected in series；Two-way can
Control silicon loop is connected in parallel on damping resistance two ends, and controller is also connected with current transformer, one end ground connection of current transformer, another
End is connected with one end of damping resistance；Blood pressure lowering adapter circuit is also connected with voltage transformer；Voltage transformer is neutral with power distribution network
Point is connected.
Described rectifying and wave-filtering is active rectification filter circuit；Described phase shift shaping circuit is passive capacitance-resistance filter electricity
Road；Described amplifying circuit is compound total radio amplifier.
The control method of described standard zero transient state switching damping resistance control device, comprises the following steps：
1) if low and medium voltage distribution network does not occur singlephase earth fault, damping resistance keeps concatenation in circuit, power distribution network
Normal operation；
2) if distribution system occurs singlephase earth fault, power network neutral point voltage signal UoThrough voltage transformer collection,
And by the blood pressure lowering adapter circuit blood pressure lowering isolation in control circuit, voltage signal shifted shaping circuit phase shift arctanCR1ω angle
Degree, voltage signal after phase shift is made comparisons by Zero-cross comparator circuit with power supply earth signal, obtains synchronous voltage signal, simultaneously after blood pressure lowering
Neutral point voltage rectified filter circuit rectification after, with the basis reference voltage U in controllerrefMake comparisons；
(1) if Uo＜ Uref, then in circuit, distribution system tape jam continues to run with for damping resistance holding series connection；
(2) if Uo＞ Uref, then controller is coordinated to carry out next step action；
3) if meeting step 2) in (2), in controller, t does not reach the default triggered time in controller time delay,
Then controller does not send trigger pulse, and damping resistance concatenates in circuit, and power distribution network tape jam continues to run with；
4) if meeting step 2) in (2), controller t time delay reach controller in the default triggered time, but
Synchronous regime is not at by the voltage signal after Zero-cross comparator circuit, then controller does not send trigger pulse, damping resistance
In circuit, power distribution network tape jam continues to run with concatenation；
5) if meeting step 2) in (2), controller t time delay reach controller in the default triggered time, zero passage
Voltage signal after comparison circuit is in synchronous regime, and controller sends trigger pulse；Trigger pulse is amplified by amplifying circuit,
And by driving isolation circuit by pulse signal security isolation, then drive bidirectional triode thyristor excision damping resistance, realize accurate zero temporary
State is it is ensured that arc suppression coil quality.
The substantive distinguishing features of the present invention are：
The switching of existing apparatus damping resistance only needs to meet neutral point voltage Uo＞ UrefCriterion (UoIt is neutral point voltage, Uref
It is reference voltage, Uref=15%UA), the trigger pulse of bidirectional triode thyristor will be produced, the cutting of control realization damping resistance
Remove.But because its trigger timing is random, the transient process being caused by damping resistance excision under extreme operating condition is residual to arc suppression coil
Stream and residual flow time cause significant impact (see above-mentioned analysis).As shown in Fig. 2 being the extinguishing arc in 10KV electric pressure for the prior art
Coil switching damping resistance under extreme operating condition, serious biasing in arc suppression coil compensation electric current, and whole compensation electric current is almost complete
Below zero line, transient process runs through whole process, and residual flow and residual flow time are created and have a strong impact on.
Compared with prior art, the invention has the beneficial effects as follows：In prior art basis add phase shift shaping circuit and
Zero-cross comparator circuit, can be with real-time monitoring neutral point voltage and bidirectional triode thyristor synchronizing voltage shape by analog or digital controller
State, is controlled the in good time switching of damping resistance, makes to draw during bidirectional triode thyristor switching damping resistance using analog or digital control technology
The transient state free component rising reduces as far as possible, improves the defect of the arc suppression coil compensation current offset being caused by transient process.Reason
Under the conditions of thinking, it is possible to achieve the standard zero transient state transient process of arc suppression coil compensation electric current under the system failure, effectively reduce damping electricity
The impact to residual flow and residual flow time for the transient process that resistance quick-switching is caused, and ensure that the quality of arc suppression coil.
Brief description
Fig. 1 is the schematic diagram of prior art bidirectional triode thyristor switching damping resistance.
Fig. 2 be 10KV electric pressure arc suppression coil utilize prior art under fault extreme operating condition switching damping resistance imitative
True figure, simulation time is 0.2s.Fig. 2 a is the analogous diagram of arc suppression coil false voltage waveform, and Fig. 2 b is arc suppression coil compensation electric current
The analogous diagram of waveform.
Fig. 3 is the system construction drawing of arc suppression coil of the present invention and control device.
Fig. 4 is the schematic diagram of control circuit of the present invention.
Fig. 5 is the control flow chart of accurate zero transient state switching damping resistance control device.
Fig. 6 be 10KV electric pressure arc suppression coil utilize the technology of the present invention under optimal switching point switching damping resistance imitative
True figure, simulation time is 0.2s.Fig. 6 a is the analogous diagram of arc suppression coil false voltage waveform, and Fig. 6 b is arc suppression coil compensation electric current
The analogous diagram of waveform.
Specific embodiment
The structure of accurate zero transient state switching damping resistance control device of the present invention, arc suppression coil and damping resistance is as schemed
Shown in 3, the composition of this device comprises：Voltage transformer (1), control circuit (2), current transformer (3) and bidirectional triode thyristor return
Road (5)；
The composition of described control circuit (2) includes：Blood pressure lowering adapter circuit, current rectifying and wave filtering circuit, phase shift shaping circuit, mistake
Zero balancing circuit, controller, amplifying circuit and driving isolation circuit.Blood pressure lowering adapter circuit respectively with current rectifying and wave filtering circuit, phase shift
Shaping circuit is connected, and phase shift shaping circuit is connected with Zero-cross comparator circuit, current rectifying and wave filtering circuit, the other end of Zero-cross comparator circuit
It is respectively connected to controller again；Controller, amplifying circuit, driving isolation circuit, bidirectional triode thyristor loop (5) are sequentially connected in series；Two-way
Controllable silicon loop (5) is connected in parallel on damping resistance (4) two ends, and controller is also connected with current transformer (3)；Current transformer (3)
One end ground connection, the other end is connected with the one end of damping resistance (4)；Blood pressure lowering adapter circuit is also connected with voltage transformer (1)；Electricity
Pressure transformer (1) is connected with power network neutral point.
The other end of damping resistance (4) is connected with arc suppression coil, both at the existing device in blowout coil set apparatus
Part, the wherein arc suppression coil other end is connected with power network neutral point.
The composition of described control circuit 2 is as shown in figure 4, described blood pressure lowering adapter circuit, current rectifying and wave filtering circuit, phase shift are whole
Shape circuit, Zero-cross comparator circuit, controller, amplifying circuit and driving isolation circuit are known technology.Wherein, blood pressure lowering adaptation electricity
Road comprises resistance R41～R45, current mode transformator T5, electric capacity C13, OP07 series operational amplifier U1；Rectifying and wave-filtering is active
Current rectifying and wave filtering circuit, circuit comprises resistance R51～R55, diode D11, D12, OP07 series operational amplifier U2；Phase shift shaping
Circuit is passive rc filter circuit, and circuit comprises resistance R1, electric capacity C, diode D9, D10；The negative electrode connection of diode D9+
10V voltage source, the anode of D10 connects -10V voltage source；Zero-cross comparator circuit comprises resistance R62, R63, and OP07 series computing is put
Big device U3；Controller can be analog controller or digitial controller, and wherein, analog controller comprises LM393 twin voltage and compares
Device device U4, NE555 trigger shaper part U5, SN74F08D and gate logic device U6, twin voltage voltage comparator U4's
Reverse input end forms reference voltage through power supply, resistance R68 and adjustable potentiometer R66, and its positive input connects resistance
R55；Digitial controller comprises hardware circuit and the samplings such as AD sampling, enumerator, single-chip microcomputer, compares and control function software；Electricity
Pressure, current transformer use DVDI001 series, and amplifying circuit uses compound total radio amplifier, and circuit comprises electricity
Resistance R8～R13, NPN type IGCT Q3, Q4, model 2N551 of IGCT, the other end of resistance R11 accesses the voltage of+15V
Source, the other end of resistance R10 and resistance R12 accesses power supply ground jointly；Isolation circuit is driven to use U7 optocoupler PS2801-1.
One end of resistance R41, R42 in described blood pressure lowering adapter circuit connects voltage transformer 1, and the other end connects electric current
The outfan of type transformator T5, current mode transformator T5 passes through to connect the reversely defeated of resistance R43, R44 access amplifier U1 respectively
Enter end, positive input, resistance R45, one end of electric capacity C13 connect resistance R43, and its other end accesses the output of amplifier U1
End；In described current rectifying and wave filtering circuit, the outfan of blood pressure lowering adapter circuit is accessed in one end of resistance R51～R52, and resistance R51's is another
One end connects the inverting input 2 of resistance R53, the negative electrode of diode D11, amplifier U2 respectively, and the other end of resistance R52 connects
The other end of resistance R55, resistance R53 connects the other end of resistance R55, and the anode of diode D11 connects the moon of diode D12
Pole, the anode of diode D12 connects resistance R55, and the U2 reverse input end 2 of amplifier connects the outfan of blood pressure lowering adapter circuit,
Positive input 3 serial resistance R54 accesses power supply ground, and 4,7 terminate into power supply -15V ,+15V, and 1,8 ends are vacant, and outfan 6 accesses
The negative electrode of diode D12；The outfan of blood pressure lowering adapter circuit is accessed in one end of resistance R1 in described phase shift shaping circuit, its
The other end connects the anode of diode D9, the negative electrode of diode D10, electric capacity C respectively, and the negative electrode of diode D9 connects+10V voltage
Source, the anode of D10 connects -10V voltage source, and the other end of electric capacity C accesses power supply ground；Resistance in described Zero-cross comparator circuit
One end of R62 connects the outfan in phase shift shaping circuit, and the other end of R62 accesses the positive input 2 of operational amplifier U3,
The reverse input end 3 serial resistance R63 of operational amplifier U3 accesses power supply ground, and 4,7 terminate into power supply -15V ,+15V, and 1,8 ends are empty
Put, outfan 6 access controller；One end of resistance R67, R68 in described controller connects the output of current rectifying and wave filtering circuit
End, the other end of resistance R68 accesses power supply+15V, and the other end of resistance R67 accesses the positive input of twin voltage comparator U4,
The reverse input end of twin voltage comparator U4 connects adjustable potentiometer R66, resistance R68, the other end of adjustable potentiometer R66 respectively
Access power supply ground, the outfan of twin voltage comparator U4 feeds back its positive input through resistance R65, and twin voltage comparator U4's is defeated
Go out end, trigger shaper part U5 is respectively connected to and gate logic device U6；Resistance R8 one end in described amplifying circuit is even
Connect the outfan of controller, the other end connects resistance R9, resistance R10, base stage b of IGCT Q3, resistance R9 other end warp respectively
Resistance R13 accesses the colelctor electrode c of IGCT Q4, and the other end of resistance R10 accesses power supply ground, and the colelctor electrode c of Q3 accesses electricity through R11
The emitter e of source+15V, Q3 connects resistance R12, base stage b of IGCT Q4 respectively, and the other end of resistance R12 accesses power supply ground,
The emitter e of IGCT Q4 accesses and drives isolation circuit U7.
In order to realize accurate zero transient state, we add phase shift shaping circuit and Zero-cross comparator electricity in prior art basis
Road, and utilize their real-time monitoring neutral point voltages and bidirectional triode thyristor synchronizing voltage state, cooperation is simulated or digital control skill
Art is realized the in good time switching of damping resistance and is controlled.
(1) analog control technique：Access phase shift shaping circuit and Zero-cross comparator circuit in the outfan of blood pressure lowering adapter circuit,
Phase shift angle is made to be arctan CR1ω(C、R1Shift capacitor respectively in analog controller, resistance), C, R1During parameter designing
Make arctanCR1(L is the equivalent inductance of arc suppression coil to ω=arctan ω L/ (R+r), and R is damping resistance, and r is arc suppression coil
D.C. resistance), the voltage signal after phase shift produces synchronous voltage signal through Zero-cross comparator circuit；Current rectifying and wave filtering circuit is used for surveying
Amount neutral point voltage Uo, the neutral point voltage U of measurementoAnd with reference voltage UrefMake comparisons.If generation singlephase earth fault,
And Uo＞ Uref, the control arteries and veins in phase shift shaping circuit and the in good time bidirectional triode thyristor loop of Zero-cross comparator circuit cooperation controller generation
Punching, controls controllable silicon to realize damping resistance excision, can accomplish zero transient state under ideal conditionss.
(2) digital control technology：Digital method is similar with simulation method principle.Shaping circuit (without phase shift) and Zero-cross comparator electricity
Road is used as the synchronizing datum signal of computer-internal enumerator, and the waveform that enumerator is used as bidirectional triode thyristor trigger pulse occurs
Device, exported after the digital phase shift time equivalent with above-mentioned simulation phase shift.After computer is used for gathering current rectifying and wave filtering circuit
Neutral point voltage Uo, the neutral point voltage U that collectsoAnd with reference value UrefMaking comparisons, if meeting pre-conditioned, exporting two-way
Control machines enable signal.Trigger after digital phase shift with enable signal phase with after, control controllable silicon realize damping electricity
Resistance excision, equally can accomplish zero transient state under ideal conditionss.
Fig. 5 is defined the workflow diagram of zero transient state switching damping resistance, and specific implementation process comprises the following steps：
1) if low and medium voltage distribution network does not occur singlephase earth fault, damping resistance keeps concatenation in circuit, power distribution network
Normal operation；
2) if distribution system occurs singlephase earth fault, power network neutral point voltage signal UoThrough voltage transformer collection,
And by the blood pressure lowering adapter circuit blood pressure lowering isolation in control circuit, voltage signal shifted shaping circuit phase shift arctanCR1ω angle
Degree, voltage signal after phase shift is made comparisons by Zero-cross comparator circuit with power supply earth signal, obtains synchronous voltage signal, simultaneously after blood pressure lowering
Neutral point voltage rectified filter circuit rectification after, with the basis reference voltage U in controllerrefMake comparisons；
(1) if Uo＜ Uref, then in circuit, distribution system tape jam continues to run with for damping resistance holding series connection；
(2) if Uo＞ Uref, then controller is coordinated to carry out next step action；
3) if meeting step 2) in (2), in controller, t does not reach the default triggered time in controller time delay,
Then controller does not send trigger pulse, and damping resistance concatenates in circuit, and power distribution network tape jam continues to run with；
4) if meeting step 2) in (2), controller t time delay reach controller in the default triggered time, but
Synchronous regime is not at by the voltage signal after Zero-cross comparator circuit, then controller does not send trigger pulse, damping resistance
In circuit, power distribution network tape jam continues to run with concatenation；
5) if meeting step 2) in (2), controller t time delay reach controller in the default triggered time, zero passage
Voltage signal after comparison circuit is in synchronous regime, and controller sends trigger pulse；Trigger pulse is amplified by amplifying circuit,
And by driving isolation circuit by pulse signal security isolation, then drive bidirectional triode thyristor excision damping resistance, realize accurate zero temporary
State is it is ensured that arc suppression coil quality.
The operation mechanism of the present invention is：
Under line failure, there is two transient processes, first transient state mistake in arc extinguishing process to turn-adjusting arc-extinguishing winding
The original state that journey occurs for fault, second transient process is the excision of damping resistance, and two transient processes can be seen as
It is a typical LR circuit transient response process (R is damping resistance).Analysis below only discusses the solution of first transient process
Analysis process, the mathematical analysis of second transient process be only the resistance (r is changed into from R) to initial value (non-zero state) and loop no
With (r is the D.C. resistance of arc suppression coil), do not change solution (response) essence.
First transient process can be expressed with the differential equation, and the solution of this differential equation can be approximately in loop and entirely disappear
Compensation electric current during arc coil work.
Wherein u=Usin (ω t+ θ), θ are the initial angle of fault moment faulted phase voltage.
Solving compensation current expression when (1) can obtain arc suppression coil work under zero state is：
ImFor steady-state current amplitude,For electric current angle of lag, τ=L/ (R+r) is that the time in loop is normal
Number, the Part I compensating electric current is steady-state component, and Part II is free component.
WhenWhen, bring into when expression formula (2) can obtain arc suppression coil work and compensate circuital expression formula and be：
I (t)=Imsin(ωt) (3)
From expression formula (3), compensate total current no free component, compensating electric current during arc extinguishing is a sine wave, no
Transient process.WhenWhen, the compensation total current expression formula that (2) formula of substitution can obtain during arc suppression coil work is：
I (t)=Imcos(ωt)-Ime-t/τ(4)
From (4) formula, the Part II free component non-zero in formula (2), Part II free component is maximum, especially
It is when the ω t=π moment, if loop time constant is longer, compensates total current and be approximately -2Im, compensate total current almost complete
Bias, subsequently within the settling time of 2 to 3 τ time constants, compensating electric current is nearly all biasing, transient process
To significantly lengthen.
From mathematical analysis, when being worked using the turn-adjusting arc-extinguishing winding of bidirectional triode thyristor switching damping resistance, eliminate
Arc process exists outside two transient state, and the work of bidirectional triode thyristor break-make, using from triggering, has periodically, and controllable silicon break-make transient state will
Carry throughout.Once so the initial phase angle of earth fault moment phase voltage under the operating mode of non-90 degree it may appear that non-zero freely divides
Amount, controllable silicon may produce asymmetric conducting.Especially under extreme operating condition, free component can be very big, and its persistent period may
The international regulations corresponding time can be exceeded, direct current biasing component is also by the arc extinguishing residual current in the impact national regulations time.This
On the bright opportunity that sends by manual control trigger pulse, opportunity arrival is analogous to above-mentionedEffect when, can make freely to divide
Amount is zero, no transient process.
Experiment and above theory analysis show, by the reasonable setting switching time, can effectively reduce transient process to residual
Stream and the impact of residual flow time, can accomplish zero transient state under ideal conditionss.As shown in fig. 6, for the technology of the present invention in 10KV voltage etc.
Level arc suppression coil switching damping resistance in optimal switching point, wherein delay-angle are phase shift angle arctanCR1ω, during switching
Between for 3～4 times of the loop time constant before turn-adjusting arc-extinguishing winding damp resistance throw-cut, the compensation electric current of arc suppression coil is right
The sine wave claiming, no transient process.
The present invention adds phase shift shaping circuit and Zero-cross comparator circuit on original circuit base, by analog or digital
Controller real-time monitoring neutral point voltage and bidirectional triode thyristor synchronizing voltage state, control resistance using analog or digital control technology
The in good time switching of buffer resistance, realizes the standard zero transient state transient process of arc suppression coil compensation electric current under the system failure, is effectively ensured
The quality of arc suppression coil.
Unaccomplished matter of the present invention is known technology.
Claims (3)
1. a kind of accurate zero transient state switching damping resistance control device, it is characterized by the composition of this device comprises：Voltage transformer, control
Circuit processed, current transformer and bidirectional triode thyristor loop；
Wherein, the composition of described control circuit includes：Blood pressure lowering adapter circuit, current rectifying and wave filtering circuit, phase shift and shaping circuit, mistake
Zero balancing circuit, controller, amplifying circuit and driving isolation circuit；Blood pressure lowering adapter circuit respectively with current rectifying and wave filtering circuit, phase shift
Shaping circuit is connected, and phase shift shaping circuit is connected with Zero-cross comparator circuit, current rectifying and wave filtering circuit, the other end of Zero-cross comparator circuit
It is respectively connected to controller again；Controller, amplifying circuit, driving isolation circuit, bidirectional triode thyristor loop are sequentially connected in series；Two-way controlled
Silicon loop is connected in parallel on damping resistance two ends, and controller is also connected with current transformer；One end ground connection of current transformer, the other end
It is connected with one end of damping resistance；Blood pressure lowering adapter circuit is also connected with voltage transformer；Voltage transformer and power network neutral point
It is connected.
2. accurate zero transient state switching damping resistance control device as claimed in claim 1, it is characterized by described rectifying and wave-filtering is
Active rectification filter circuit；Described phase shift shaping circuit is passive rc filter circuit；Described amplifying circuit is compound common
Penetrate amplifying circuit.
3. the control method of accurate zero transient state switching damping resistance control device as claimed in claim 1, it is characterized by include with
Lower step：
1) if low and medium voltage distribution network does not occur singlephase earth fault, damping resistance keeps concatenation in circuit, and power distribution network is normal
Run；
2) if distribution system occurs singlephase earth fault, power network neutral point voltage signal UoThrough voltage transformer collection, and by controlling
Blood pressure lowering adapter circuit blood pressure lowering isolation in circuit processed, voltage signal shifted shaping circuit phase shift arctanCR1ω angle, zero passage
Voltage signal after phase shift is made comparisons by comparison circuit with power supply earth signal, obtains synchronous voltage signal, the neutrality after blood pressure lowering simultaneously
After point voltage rectified filter circuit rectification, with the basis reference voltage U in controllerrefMake comparisons；
(1) if Uo＜ Uref, then in circuit, distribution system tape jam continues to run with for damping resistance holding series connection；
(2) if Uo＞ Uref, then controller is coordinated to carry out next step action；
3) if meeting step 2) in (2), in controller, t does not reach the default triggered time in controller time delay, then control
Device processed does not send trigger pulse, and damping resistance concatenates in circuit, and power distribution network tape jam continues to run with；
4) if meeting step 2) in (2), controller t time delay reaches the default triggered time in controller, but passes through
Voltage signal after Zero-cross comparator circuit is not at synchronous regime, then controller does not send trigger pulse, and damping resistance concatenates
In circuit, power distribution network tape jam continues to run with；
5) if meeting step 2) in (2), controller t time delay reach controller in the default triggered time, Zero-cross comparator
Voltage signal after circuit is in synchronous regime, and controller sends trigger pulse；Trigger pulse is amplified by amplifying circuit, and by
Drive isolation circuit by pulse signal security isolation, then drive bidirectional triode thyristor excision damping resistance, realize accurate zero transient state, protect
Card arc suppression coil quality.
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| CN107069663A (en) * | 2017-04-14 | 2017-08-18 | 思源电气股份有限公司 | Applied to the small resistor intelligent protection system in neutral flexible grounding mode |
| CN107196286A (en) * | 2017-07-31 | 2017-09-22 | 天津市天变航博电气发展有限公司 | Damping resistance synchronous triggering device and triggering method |
| CN107508296A (en) * | 2017-07-26 | 2017-12-22 | 国网山东省电力公司莱芜供电公司 | A kind of system and method for the regulating time for reducing control asymmetrical voltage |
| CN107565540A (en) * | 2017-09-30 | 2018-01-09 | 天津市天变航博电气发展有限公司 | The synchronous trigger control device of arc suppression coil damped resistor delay and triggering method |
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| CN107508296B (en) * | 2017-07-26 | 2020-03-17 | 国网山东省电力公司莱芜供电公司 | System and method for reducing adjustment time for controlling asymmetric voltage |
| CN107196286A (en) * | 2017-07-31 | 2017-09-22 | 天津市天变航博电气发展有限公司 | Damping resistance synchronous triggering device and triggering method |
| CN107196286B (en) * | 2017-07-31 | 2019-07-26 | 天津市天变航博电气发展有限公司 | Damping resistance synchronous triggering device and triggering method |
| CN107565540A (en) * | 2017-09-30 | 2018-01-09 | 天津市天变航博电气发展有限公司 | The synchronous trigger control device of arc suppression coil damped resistor delay and triggering method |
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