CN1700550A - Method for suppressing power transformer excitation surge current and suppressor - Google Patents
Method for suppressing power transformer excitation surge current and suppressor Download PDFInfo
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- CN1700550A CN1700550A CN 200510034479 CN200510034479A CN1700550A CN 1700550 A CN1700550 A CN 1700550A CN 200510034479 CN200510034479 CN 200510034479 CN 200510034479 A CN200510034479 A CN 200510034479A CN 1700550 A CN1700550 A CN 1700550A
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Abstract
This invention discloses one power transducer exciting magnetic flow depressing method and device, wherein, the method comprises the following steps: setting exciting magnetic flow suppressor by side of power to real time test voltage phase angle; the breaker gate records and saves the phase angle data and sends brake order before the phase angle arrives; the breaker is connected between the transducer and power and the brake gate control end is connected to suppressor output end composed of single machine with its input end receiving the three phase power voltage analogue input signal and control switch input signal.
Description
Technical field
The present invention relates to a kind of inhibition method and apparatus of power transformer excitation surge current.
Background technology
Power transformer air-drop charging, or operating transformer outlet failure removal can bring out magnetizing inrush current, and also can bring out contiguous operating transformer during the air-drop transformer and produce and echo surge current.Because tranformer protection can not guarantee that right area branch excitation is shoved and the difference of fault current, the protection malfunction that causes is of common occurrence.Moreover and echo surge current because of the decay characteristics of its special length even cause the differential protection malfunction of generator.For improving the accuracy of discerning the feature of shoving, vast electric power scientific worker has paid hard work for many years, but effect is still not fully up to expectations.Reason is: 1, the variation of magnetizing inrush current feature has increased the identification difficulty; 2, the electromagnetic property that electromagnetic current transducer is easily saturated has increased the probability of protection malfunction.
Summary of the invention
The inhibition method and apparatus that the purpose of this invention is to provide a kind of power transformer excitation surge current; the technical problem that solves is to eliminate magnetizing inrush current; avoid malfunction for tranformer protection, and elimination causes line voltage rapid drawdown and and serious harmonic pollution because of magnetizing inrush current.
The present invention is by the following technical solutions: a kind of inhibition method of power transformer excitation surge current may further comprise the steps: one, exciting surge suppressor is set in the transformer frequency response side, and the source that Connects Power; Two, exciting surge suppressor detects the phase angle of transformer frequency response side voltage in real time; Three, during transformer frequency response side breaker open operation, the transformer frequency response separating brake phase angles data of moment also preserved in the exciting surge suppressor record; When four, closing a floodgate, the corresponding time of exciting surge suppressor before arrive in identical or close phase angle during by separating brake is sent the order of closing a floodgate to circuit breaker; Five, close a floodgate in circuit breaker identical phase angle with separating brake the time.
The inhibition method step one of power transformer excitation surge current of the present invention is included in the transformer outlet exciting surge suppressor is set, and the source that Connects Power; Step 2 comprises that exciting surge suppressor detects the phase angle of transformer outlet busbar voltage in real time; Step 3 comprises when transformer outlet fault takes place that the exciting surge suppressor record is also preserved the phase angles data that fault takes place by moment; Step 4 comprises that exciting surge suppressor received behind the signal of relaying protection excision fault according to the breaker open operation of adjusting during the time, and the corresponding time before arriving by the identical or close phase angle of instant of failure is sent the separating brake order to circuit breaker; Step 5 comprises that circuit breaker in line fault moment tripping line-breaker during identical or close phase angle takes place.
The opening time of circuit breaker of the present invention and closing time are in advance as setting parameter input exciting surge suppressor.
Method of the present invention is when closing a floodgate, and exciting surge suppressor sends the order of closing a floodgate according to adjust closing time parameter and the phase angle required time forward direction circuit breaker when capturing separating brake last time; Described when transformer outlet fault trip, exciting surge suppressor occurs required time forward direction circuit breaker once more according to the opening time parameter seizure line fault generation transient voltage phase angle of adjusting and sends trip signal excision fault.
Separating brake of the present invention and closing time are accurate separating brake and the closing times through actual measurement circuit breaker main contact and the auxiliary contact circuit breaker that difference is obtained after revising operate time.
Transformer of the present invention is a single-phase transformer when dropping first, and exciting surge suppressor drops into power supply when catching the supply voltage pi/2 that occurs first or 3 pi/2 phase angles; Transformer is that three-phase transformer with phase-splitting time-sharing operation mechanism circuit breaker is when dropping first, exciting surge suppressor is caught and is dropped into this line voltage source when the line voltage that occurs first is pi/2 or 3 pi/2 phase angles, and the third phase power supply and then closes behind experience π/3 phase angles; Transformer is a three-phase transformer with three-phase combined operation mechanism circuit breaker when dropping first, and exciting surge suppressor drops into power supply when catching the pi/2 that occurs first or 3 pi/2 phase angles.
A kind of power transformer excitation surge current inhibitor, between transformer and power supply, be connected circuit breaker, the combined floodgate control end of circuit breaker connects the output of exciting surge suppressor, described exciting surge suppressor comprises single-chip microcomputer, the input of single-chip microcomputer receives three-phase mains voltage analog quantity input signal and control switch amount input signal, the output termination switching value output circuit of single-chip microcomputer.
Voltage analog input signal of the present invention by three-phase mains voltage through voltage transformer, voltage changer analog quantity input to single-chip microcomputer; Control switch amount input signal comprises switching signal, sub-gate signal, reset signal, main contact signal and auxiliary contact signal.
Be serially connected with current transformer between transformer of the present invention and the circuit breaker, the output signal of its secondary side is through the input of power pack to single-chip microcomputer, and the output of single-chip microcomputer also is connected with LCDs, and single-chip microcomputer is provided with the interface that carries out communication with host computer.
Microprocessor of the present invention adopts single-chip microcomputer C8051F020, and voltage changer adopts TR0111, and power pack adopts TR0101, and the switching value output circuit adopts IGBT or G4PC50UD, and circuit breaker can be single-phase or three-phase breaker.
The present invention compared with prior art, during the excision of power transformer excitation surge current inhibitor record transformer frequency response or the phase angle of outlet transcient short circuit time is to obtain the remanent magnetism polarity and the numerical value of single-phase or three-phase magnetic circuit, and the initial phase angle by control air-drop transformer frequency response makes the magnetic bias counteracting remanent magnetism because of producing by constant-linkage theorem, magnetic circuit just can be unsaturated when air-drop like this, thereby realize magnetizing inrush current eliminated in the inhibition or the title that shove.
Description of drawings
Fig. 1 is single-phase transformer air-drop figure.
Fig. 2 is switching angle α=0 an o'clock flux change curve.
Fig. 3 is the relation curve of magnetic bias and α.
Fig. 4 is primary voltage U
1Vectogram with main flux Φ m.
Fig. 5 is primary voltage U
1Curve chart with main flux Φ m.
Fig. 6 is a power transformer excitation surge current suppressor circuit schematic diagram.
Fig. 7 is an excision transformer frequency response flow chart.
Fig. 8 drops into the transformer frequency response flow chart.
Fig. 9 is that the transformer tripping operation magnetizing inrush current that breaks down suppresses flow chart.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
Power transformer produces magnetizing inrush current need possess following condition: 1, AC power circuit, and 2, have an inductance element, 3, the magnetic circuit of inductance element is nonlinear material, have remanent magnetism and can enter saturation condition, 4, to rise sharply appear in applied voltage.Be not difficult to find out inductance coil with ferromagnet magnetic circuit, follow the feature of constant-linkage theorem with it, when executing voltage swells outside, with polarization and applied voltage the rise sharply relevant magnetic bias in phase angle and the stable state magnetic flux of alternation, this magnetic bias may cause offsetting original remanent magnetism, and also may causing increasing former remanent magnetism, that magnetic circuit is entered is saturated.As be the latter, then make the hurried decline of excitation reactance, and then produce the considerable magnetizing inrush current of numerical value because of magnetic circuit is saturated.If can grasp the remanent magnetism polarity and the numerical value of magnetic circuit, and the control applied voltage rises sharply and causes the polarity of magnetic bias, avoids magnetic circuit saturated, so just realized the inhibition that presses down of magnetizing inrush current.
The transformer excitation flow origin cause of formation is described, as shown in Figure 1.With the single-phase transformer is example, N
1, N
2Be respectively the number of turn of primary and secondary winding, Φ is the total magnetic flux with elementary winding interlinkage, i.e. main flux and leakage field energy, u
1For adding AC supply voltage, i
1Be primary current, the secondary winding open circuit, promptly transformer is unloaded, can write out the voltage equation of elementary winding
R
1Be elementary winding resistance, applied voltage source voltage u
1Can be expressed as:
u
1＝U
MSin(ωt+α)
U when α is t=0
1Starting phase angle, U
MBe voltage u
1Amplitude, so voltage equation can be rewritten as
As negligible resistance R
1, then formula (1.1) becomes
Find the solution the expression formula that the differential equation (1.2) gets magnetic flux Φ
Integral constant C can the initial conditions when closing a floodgate moment t=0 try to achieve, and based on constant-flux-linkage theorem, magnetic linkage can not suddenly change in the moment iron core that closes a floodgate, and promptly Φ is 0 when t=0+ and t=0-, therefore, is tried to achieve by formula (1.3)
Formula (1.4) substitution formula (1.3) is got
If
Be the maximum of stable state magnetic flux, formula (1.5) becomes
Φ＝Φm[COSα-COS(ωt+α)]?????????(1.6)
Drop into supply voltage u as can be seen by formula (1.6)
1First phase parallactic angle α directly influence the flux value of transformer air-drop transient process. when being t=0 as air-drop moment
Finding the solution formula (1.6) can get
Φ＝Φm?Sint?????????????????(1.7)
Be that the magnetic flux that power supply drops in the moment transformer magnetic circuit enters steady-state value Φ m Sint immediately, that is to say there is not transient process do not have magnetizing inrush current.Obviously, this is optimal air-drop opportunity.In like manner, air-drop also same result can occur when α=3 pi/2s.
As drop moment α=0 when being t=0, find the solution formula (1.6)
Can get Φ=Φ m-Φ m Cos ω t (1.8)
Be that power supply drops in the moment transformer magnetic circuit except producing a stable state magnetic flux-Φ m Cost, the transient state magnetic flux that also to produce a numerical value be Φ m or claim magnetic bias.This process can be described with Fig. 2: as shown in Figure 2, the transient state magnetic flux that occurs suddenling change when t=0 is as the resistance R of primary winding
1=0, this transient state magnetic flux is kept constant Φ m always.As R
1＞0, then the transient state magnetic flux will be by the time constant of elementary winding
Decay, shown in dotted line.Therefore the synthetic total magnetic flux of transient state magnetic flux and stable state magnetic flux departs from time shaft, and this forms the main inducing of magnetizing inrush current just, and because of total magnetic flux makes the magnetic circuit supersaturation, excitation reactance sharply descends, and then the initiation exciting current sharply increases.Chain-dotted line among Fig. 2 is the saturation flux Φ sat of transformer magnetic circuit, promptly when total magnetic flux during greater than Φ sat magnetic circuit with saturated, thereby make ω t at θ
1To θ
2Magnetizing inrush current i appears in the interval
y(chain-dotted line), magnetizing inrush current ends in the time of under total magnetic flux drops to saturation flux, this just magnetizing inrush current have the reason of discontinuity.
The thinking that suppresses transformer excitation flow: from above description to the magnetizing inrush current origin cause of formation, be not difficult to find out that magnetizing inrush current causes because of transformer magnetic circuit is saturated, and cause the saturated factor of magnetic circuit is the magnetic bias Φ P that original remanent magnetism Φ re of magnetic circuit and air-drop transients occur, i.e. the transient state magnetic flux.Numerical value and the polarity of remanent magnetism Φ re are uncontrollable, and the starting phase angle of supply voltage was realized control when magnetic bias then need be dropped by seizure.Seizure means that let us not go into the question now how, only with regard to three phase mains, people can't go to capture simultaneously the initial phase angle of the pi/2 or 3 pi/2s of A, B, C three-phase voltage with one three switch that links, unless adopt the switch of timesharing phase-splitting operation.Run counter to so again and require three-phase phase-splitting operating breaker not allow the rules of phase-splitting time-sharing operation now.May be based on this reason, nobody goes to study the problem of eliminating magnetizing inrush current again, on everybody this rugged mountain pass beset with brambles of having gone on research identification magnetizing inrush current feature simultaneously.The result is the effort of paying hardships, and what get in return is meagre repayment, and the protective relaying device of transformer is not contained to get off because of the magnetizing inrush current malfunction, let alone removed voltage collapse and the harmonic pollution that produces because of magnetizing inrush current.
Formula (1.6) can be rewritten as
Φ＝ΦmCOSα-ΦmCOS(ωt+α)?????(1.9)
Find out that from formula (1.9) the air-drop magnetic bias that transformer produced is
Φ
P＝ΦmCOSα???????????????????(1.10)
The Φ that different combined floodgate initial phase angle α is corresponding different
PValue, as shown in Figure 3, from Φ
PWith the relation curve of α, in the time of can seeing α=0 and α=π magnetic bias forward and negative sense occur maximum Φ m and-Φ m, α between 0～pi/2 and 3 pi/2s～2 π be on the occasion of, and between pi/2～3 pi/2s, be negative value.This explanation can realize control to magnetic bias polarity and numerical value by control combined floodgate initial phase angle α, if remanent magnetism polarity and the numerical value in the magnetic circuit can write down the transformer outage time then can make magnetic bias offset remanent magnetism by the initial phase angle α of control air-drop transformer fully.Magnetic circuit just can be unsaturated when air-drop like this, thereby realize magnetizing inrush current eliminated in the inhibition or the title that shove.
The specific implementation that suppresses magnetizing inrush current: by three-phase breaker phase-splitting time-sharing operation is what to be easy to realize to the inhibition of magnetizing inrush current, but present rules are not allowed.Therefore, a situation at the combined operation of three-phase breaker three-phase designs.
The control of transformer magnetic circuit remanent magnetism.The transformer core of any material all can leave remanent magnetism in iron core after power supply disconnects, phase angle when the polarity of remanent magnetism and numerical value disconnect with power supply is relevant, because three phase mains disconnects when the phase place that differs 120 ° respectively simultaneously, therefore, the remanent magnetism polarity and the numerical value of three-phase magnetic circuit also have nothing in common with each other, but fixing relation is arranged between the three.
The relation at primary voltage phase angle as shown in Figure 4, was the primary voltage U of an on-load single-phase transformer when we at first analyzed magnetic circuit remanent magnetism and power supply disconnection
1Phase relation with main flux Φ m.
U wherein
1-primary voltage
E
1-primary potential
I
1-primary current
R
1-elementary winding resistance
X
10-elementary winding leakage reactance
φ
1-power-factor angle
Φ m-main flux
By seeing primary voltage U among Fig. 4
1Leading main flux (90 °+β), β is a loss angle, as shown in Figure 5, is U
1With the curve chart of Φ m, dotted line is the flux curve that diminishes transformer, here can find when the transformer frequency response voltage U
1During excision the polarity and the numerical value of remanent magnetism in the corresponding magnetic circuit, thereby can control magnetic circuit remanent magnetism by dual mode, promptly given U
1When certain phase angle, cut off the electricity supply, or disconnect U at random
1Shi Jilu disconnects moment U
1The phase angle, so the remanent magnetism polarity of transformer and the control of numerical value only need be controlled or write down primary source outage phase angle and be got final product.As each side of transformer power supply is arranged all, then remanent magnetism is to be determined by the voltage phase angle of that side of last deenergization.
The inhibition of magnetizing inrush current.Magnetizing inrush current is that the magnetic bias that produces in the air-drop transformer transient process causes that magnetic circuit is saturated to be brought out, and therefore, when transformer drop, if can make the counteracting of magnetic bias and former magnetic circuit remanent magnetism can realize inhibition to shoving.Before address, can control the polarity and the numerical value of magnetic circuit remanent magnetism by the method for selecting excision operating transformer supply voltage phase angle, select appropriate combined floodgate phase angle again when dropping into transformer frequency response, the magnetic bias that transient process is produced is offset original remanent magnetism just.Magnetic circuit will not enter the saturation region like this, thus the purpose that realization is shoved and thoroughly suppressed.
As can be seen, the polarity of magnetic bias Φ P is relevant with combined floodgate starting phase angle α with numerical value from formula 1.10.Can find out again that from Fig. 5 the phase angle when remanent magnetism polarity behind the transformer excision power supply in magnetic circuit and numerical value also excise with power supply is relevant.U for example
1Magnetic circuit remanent magnetism is 0 when the pi/2 phase clipped corner, and magnetic circuit remanent magnetism is the positive polarity maximum when excising at the π phase angle, and is same, then is the negative polarity maximum when excising at 2 π phase angles.The correlation of the magnetic bias Φ p that the same phase angle is produced when remanent magnetism Φ re that the phase angle produced when transformer is excised and air-drop is listed table 1 in.Draw a significant conclusion thus: when transformer when the phase angle of power turn-on equated with the phase angle of original excision transformer frequency response once more magnetizing inrush current thoroughly eliminated.This conclusion to arbitrary phase angle branch, close all and be suitable for, and also all be suitable for polyphase transformer and different magnetic structure single-phase.Experiment shows, switching angle is not obvious to suppressing the magnetizing inrush current function effect in ± 45 degree scopes the time to separating brake angle relative deviation.
The inhibition method of power transformer excitation surge current of the present invention may further comprise the steps: one, exciting surge suppressor is set in the transformer frequency response side, and the source that Connects Power; Two, the opening time of circuit breaker and closing time are in advance as setting parameter input exciting surge suppressor; Three, exciting surge suppressor detects the phase angle of transformer frequency response side voltage in real time; Four, during breaker open operation, the separating brake voltage-phase angular data of moment also preserved in the exciting surge suppressor record; When five, closing a floodgate, exciting surge suppressor is identical or close when calculating appearance first with separating brake according to setting parameter, and the corresponding time before arrive in the phase angle in ± 45 degree scopes is approximately sent the combined floodgate order to circuit breaker; Six, circuit breaker is finished combined floodgate during identical or close phase angle with separating brake the time.
The inhibition method step one of power transformer excitation surge current of the present invention is included in transformer outlet side exciting surge suppressor is set, and the source that Connects Power; Step 3 comprises that exciting surge suppressor detects the phase angle of transformer outlet busbar voltage in real time; Step 4 comprises when transformer outlet fault takes place that the exciting surge suppressor record is also preserved the phase angles data that fault takes place by moment; Step 5 comprises that protective relaying device will excise fault-signal and send to exciting surge suppressor, the breaker open operation that the exciting surge suppressor basis is adjusted is during the time, identical or close during by fault, the corresponding time before arrive in the phase angle in ± 45 degree scopes is approximately sent the separating brake order to circuit breaker; Step 6 comprises that circuit breaker in line fault moment tripping line-breaker during identical or close phase angle takes place.
When closing a floodgate, exciting surge suppressor sends the order of closing a floodgate according to adjust closing time parameter and the phase angle required time forward direction circuit breaker when catching separating brake last time.When transformer outlet fault, exciting surge suppressor is according to the opening time parameter of adjusting, and seizure line fault generation transient voltage phase angle occurs required time forward direction circuit breaker once more and sends trip signal excision fault.
The accurate separating brake and the closing time that obtain circuit breaker through the main contact and auxiliary contact difference operate time of circuit breaker when separating brake and combined floodgate are revised setting parameter.Transformer is a single-phase transformer when dropping first, and exciting surge suppressor drops into power supply when catching the supply voltage pi/2 that occurs first or 3 pi/2 phase angles; Transformer is that three-phase transformer with phase-splitting time-sharing operation mechanism circuit breaker is when dropping first, exciting surge suppressor is caught and is dropped into this line voltage source when the line voltage that occurs first is pi/2 or 3 pi/2 phase angles, and the third phase power supply and then closes behind experience π/3 phase angles; Transformer is that three-phase transformer with three-phase combined operation mechanism circuit breaker is when dropping first, drop into power supply when pi/2 that the exciting surge suppressor seizure occurs first or 3 pi/2 phase angles, three phase excitation was shoved and can not be suppressed fully this moment, as excising transformer frequency response by exciting surge suppressor immediately, and the phase angle in when excision record, after this will can not produce magnetizing inrush current again.
As shown in Figure 6, power transformer excitation surge current inhibitor of the present invention, comprise single-chip microcomputer and corresponding control circuit, be connected circuit breaker between transformer and the power supply, the control end of circuit breaker connects the output of exciting surge suppressor, the input of single-chip microcomputer receives three-phase mains voltage analog quantity input signal, and the input signal of signals such as switching signal, sub-gate signal, reset signal, circuit breaker main contact signal and auxiliary contact, the output termination switching value output circuit of single-chip microcomputer, the switching value output circuit connects branch, the combined floodgate control end of circuit breaker.Because therefore exciting surge suppressor can, divide the order of circuit breaker also can not give the inhibitor of shoving by the monitoring of transformer frequency response voltage and auxiliary contact being obtained supply voltage separating brake phase angle.
The voltage analog input signal by three-phase mains voltage through voltage transformer, voltage changer analog quantity input to single-chip microcomputer; Be serially connected with current transformer between transformer and the circuit breaker, the output signal of its secondary side is delivered to the input of single-chip microcomputer through power pack, and the output of single-chip microcomputer also is connected with LCDs, and single-chip microcomputer is provided with the interface that carries out communication with host computer.
Single-chip microcomputer adopts C8051F020, voltage changer adopts TR0111, and power pack adopts TR0101, and the switching value output circuit adopts IGBT (G4PC50UD), circuit breaker is a controlled device, can be the single-phase or three-phase breaker of different electric pressures, different rupturing capacity, different operating voltage.
The address bus of this single-chip microcomputer, data/address bus and control bus do not go out chip, are suitable for using in the more abominable industrial environment of electromagnetic environment.The single-chip microcomputer internal resource is abundanter, contains 12 ADC, 8 path analoging switch, programmable gain amplifier, two 12 DAC, two analog comparators, internal voltage reference, vdd voltage monitor/step-down detector, 64 I/O mouth lines, UART serial ports, 16 digit counters able to programme, house dog etc.Working temperature-40 ℃～+ 85 ℃.Realization is shoved and is suppressed not high to the functional requirement of single-chip microcomputer, and the emphasis of design circuit is to improve antijamming capability and reliability.
Though power transformer excitation surge current inhibitor of the present invention when the power transformer operate as normal or when deactivating all to three-phase mains voltage U
A, U
B, U
C, and three-phase current I
A, I
B, I
CSample,, obtain the operating mode of transformer throwing, retreating simultaneously by the auxiliary contact state of three-phase breaker with data such as the numerical value that obtains voltage and electric current and phase places.No matter be manually or come from automatics the control command of closing of circuit breaker is carried out by exciting surge suppressor, and the sub-gate signal of circuit breaker can be issued circuit breaker by other equipment, and the inhibitor of shoving can be by obtaining the separating brake phase angle to the monitoring of supply voltage and auxiliary contact.U
A, U
B, U
C, I
A, I
B, I
CAlso as the record ripple amount of exciting surge suppressor, so as minute, closing operation can provide correspondent voltage, current waveform record after carrying out.The closing time of circuit breaker and opening time are the important parameters that guarantees accurately to catch branch, combined floodgate phase angle, exciting surge suppressor can measure main contact when the circuit breaker main contact breaks away from power supply and auxiliary contact closes, the operate time during separating brake is poor, so that the closing time and the opening time of measurement circuit breaker are provided when normal branch, the closing operation by auxiliary contact.
As shown in Figure 7, excision transformer frequency response flow process is: the power transformer excitation surge current inhibitor at first powers on or resets, check that whether circuit breaker is at closing position, if, then wait for the separating brake order, if not, check once more that then whether circuit breaker is at closing position, the power transformer excitation surge current inhibitor is sent the separating brake order, if calculate separating brake phase angle, starting voltage and current recording, preservation separating brake phase angles data, judge that whether circuit breaker is in the separating brake position, then separating brake success, if not, then separating brake failure.
As shown in Figure 8, dropping into the transformer frequency response flow process is: the power transformer excitation surge current inhibitor at first powers on or resets, and whether checks circuit breaker in the separating brake position, if, then wait for the order of closing a floodgate, if not, whether then check circuit breaker once more in the separating brake position, the power transformer excitation surge current inhibitor is sent combined floodgate order, starting voltage and current recording, is judged that whether circuit breaker is at closing position by the separating brake phase angle, if, then close a floodgate successfully, if not, the failure of then closing a floodgate.
As shown in Figure 9; transformer outlet fault trip magnetizing inrush current suppresses flow process: the power transformer excitation surge current inhibitor at first powers on or resets; check that whether circuit breaker is at closing position; if not; check once more that then whether circuit breaker is at closing position; if; then search has or not route protection outlet trip signal, if do not have, then continues search; if have; then calculate fault and moment supply voltage phase angle takes place, preserve phase angles data, send the instruction of excision circuit breaker, whether judge circuit breaker in the separating brake position, if, then separating brake success; if not, then separating brake failure.
Power transformer excitation surge current inhibitor of the present invention is carried out the phase angle sampling to the three-phase voltage of transformer frequency response at any time, and to obtain the phase angle of separating brake and combined floodgate, the opening time of circuit breaker and closing time are all in advance as setting parameter input inhibitor.By independent power source instruction artificial or that automatics is sent, behind the opening time of power transformer excitation surge current inhibitor through adjusting three-phase breaker is carried out sub-switching operation, and write down the separating brake power phase angle of moment.After this, when artificial or automatics are sent reclosing command, the power transformer excitation surge current inhibitor is according to separating brake phase angle of writing down before this and the breaker closing time of adjusting, catch the identical of appearance first or be comparable to the last time phase angle realization closing operation at separating brake phase angle by calculating, finish no-flashy-flow air-drop transformer, minute, measure the separating brake and the closing time of circuit breaker when closing a floodgate automatically by the displacement signal of circuit breaker auxiliary contact, as the foundation of revising setting parameter.The action life period of considering circuit breaker main contact and auxiliary contact is poor, and the power transformer excitation surge current inhibitor is also with measuring auxiliary contact and the function of main contact time difference.This moment, main contact should be tested when breaking away from high voltage source.
Exciting surge suppressor also has the function of carrying out communication with host computer, lays a good foundation for including inhibitor in robot control system(RCS).
Because the original remanent magnetism of magnetic circuit is unknown state, thereby unavoidably when charging air-drop can produce the uncertain magnetizing inrush current of numerical value first when power transformer put into operation first.For this reason, the transformer excitation flow inhibitor is provided with the following operation sequence of dropping first: 1, single-phase transformer drop sequence first, this program drop into power supply when catching the pi/2 that occurs first or 3 pi/2 phase angles, this moment voltage transformer excitation surge current free; 2, the drop sequence first of the three-phase transformer with phase-splitting time-sharing operation mechanism circuit breaker, this program is caught and is dropped into this line voltage source when the line voltage that occurs first is pi/2 or 3 pi/2 phase angles, and and then close behind experience π/3 phase angles the third phase power supply; 3, the drop sequence first of the three-phase transformer with three-phase combined operation mechanism circuit breaker, this program drop into power supply when catching the pi/2 that occurs certain phase first or 3 pi/2 phase angles, and this operation can not suppress whole three phase excitations and shove.After transformer puts into operation first, the branch of transformer, closing operation all will enter the no-flashy-flow state backward.
The matching principle of single-phase and heterogeneous non-linear magnetic circuit transformer alternating supply voltage same-phase clipped corner and input; magnetizing inrush current when all having proved the transformer air-drop in theoretical and practice can be eliminated fully; this is for eradicating malfunction for tranformer protection; improve the electrical network quality of power supply, it is significant to improve the power system operation reliability.
Table 1 is remanent magnetism and magnetic bias tabulation when identical excision and input angle
| ??α | ??0 | ??π/2 | ??π | ??3π/2 | ??2π |
| ??Φre | Negative maximum | ??0 | Positive maximum | ??0 | Negative maximum |
| ??Φp | Positive maximum | ??0 | Negative maximum | ??0 | Positive maximum |
Claims (10)
1. the inhibition method of a power transformer excitation surge current may further comprise the steps: one, exciting surge suppressor is set in the transformer frequency response side, and the source that Connects Power; Two, exciting surge suppressor detects the phase angle of transformer frequency response side voltage in real time; Three, during transformer frequency response side breaker open operation, the transformer frequency response separating brake phase angles data of moment also preserved in the exciting surge suppressor record; When four, closing a floodgate, the corresponding time of exciting surge suppressor before arrive in identical or close phase angle during by separating brake is sent the order of closing a floodgate to circuit breaker; Five, close a floodgate in circuit breaker identical phase angle with separating brake the time.
2. the inhibition method of power transformer excitation surge current according to claim 1, it is characterized in that: the inhibition method step one of described power transformer excitation surge current is included in the transformer outlet exciting surge suppressor is set, and the source that Connects Power; Step 2 comprises that exciting surge suppressor detects the phase angle of transformer outlet busbar voltage in real time; Step 3 comprises when transformer outlet fault takes place that the exciting surge suppressor record is also preserved the phase angles data that fault takes place by moment; Step 4 comprises that exciting surge suppressor received behind the signal of relaying protection excision fault according to the breaker open operation of adjusting during the time, and the corresponding time before arriving by the identical or close phase angle of instant of failure is sent the separating brake order to circuit breaker; Step 5 comprises that circuit breaker in line fault moment tripping line-breaker during identical or close phase angle takes place.
3. the inhibition method of power transformer excitation surge current according to claim 2 is characterized in that: the opening time of described circuit breaker and closing time are in advance as setting parameter input exciting surge suppressor.
4. the inhibition method of power transformer excitation surge current according to claim 3, it is characterized in that: described when closing a floodgate, exciting surge suppressor sends the order of closing a floodgate according to adjust closing time parameter and the phase angle required time forward direction circuit breaker when capturing separating brake last time; Described when transformer outlet fault trip, exciting surge suppressor occurs required time forward direction circuit breaker once more according to the opening time parameter seizure line fault generation transient voltage phase angle of adjusting and sends trip signal excision fault.
5. the inhibition method of power transformer excitation surge current according to claim 4 is characterized in that: described separating brake and closing time are accurate separating brake and the closing times through actual measurement circuit breaker main contact and the auxiliary contact circuit breaker that difference is obtained after revising operate time.
6. the inhibition method of power transformer excitation surge current according to claim 5, it is characterized in that: described transformer is a single-phase transformer when dropping first, and exciting surge suppressor drops into power supply when catching the supply voltage pi/2 that occurs first or 3 pi/2 phase angles; Transformer is that three-phase transformer with phase-splitting time-sharing operation mechanism circuit breaker is when dropping first, exciting surge suppressor is caught and is dropped into this line voltage source when the line voltage that occurs first is/2 or 3 pi/2 phase angles, and the third phase power supply and then closes behind experience π/3 phase angles; Transformer is a three-phase transformer with three-phase combined operation mechanism circuit breaker when dropping first, and exciting surge suppressor drops into power supply when catching the pi/2 that occurs first or 3 pi/2 phase angles.
7. power transformer excitation surge current inhibitor, between transformer and power supply, be connected circuit breaker, the combined floodgate control end of circuit breaker connects the output of exciting surge suppressor, it is characterized in that: described exciting surge suppressor comprises single-chip microcomputer, the input of single-chip microcomputer receives three-phase mains voltage analog quantity input signal and control switch amount input signal, the output termination switching value output circuit of single-chip microcomputer.
8. power transformer excitation surge current inhibitor according to claim 7 is characterized in that: described voltage analog input signal by three-phase mains voltage through voltage transformer, voltage changer analog quantity input to single-chip microcomputer; Control switch amount input signal comprises switching signal, sub-gate signal, reset signal, main contact signal and auxiliary contact signal.
9. power transformer excitation surge current inhibitor according to claim 8, it is characterized in that: be serially connected with current transformer between described transformer and the circuit breaker, the output signal of its secondary side is through the input of power pack to single-chip microcomputer, the output of single-chip microcomputer also is connected with LCDs, and single-chip microcomputer is provided with the interface that carries out communication with host computer.
10. power transformer excitation surge current inhibitor according to claim 9, it is characterized in that: described microprocessor adopts single-chip microcomputer C8051F020, voltage changer adopts TR0111, power pack adopts TR0101, the switching value output circuit adopts IGBT or G4PC50UD, and circuit breaker can be single-phase or three-phase breaker.
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