CN105007013A - Transformer automatic phase-selection control method - Google Patents
Transformer automatic phase-selection control method Download PDFInfo
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Abstract
The invention discloses a transformer automatic phase-selection control method. The method comprises steps of: detecting voltage signals and current signals of a power grid in real time, and carrying out voltage zero point and reference current zero point extraction; receiving an action instruction for driving a transformer to act, and detecting whether the action instruction is a closing instruction or an opening instruction; according to the action instruction, detecting the on-off state of a circuit breaker contact for controlling the closing and opening of the transformer and the detecting voltage value of an energy storage capacitor for driving a circuit breaker, and judging whether the action requirements are met; if yes, executing the closing/opening operation; and if not, executing fault processing operation. According to the invention, the phase-selection automatic switching technology is used to control the transformer to complete the closing or opening operation at an optimum phase, so that shock-free smooth transition is realized in the transformer switching process.
Description
Technical field
The present invention relates to electric power transfer control field, especially, relate to a kind of transformer automatic phase selecting control method.
Background technology
Power network is a dynamical system, and supply and demand change and power-balance problems mandate electrical network each several part can drop into reliably, in time or excise.The operating characteristics of switch to the safe, stable of electrical network and economical operation most important.Be applied to the switch of switching capacitive load (Capacitor banks, unloaded power transmission line etc.) or inductive load (transformer, Reactor banks, large capacity motor etc.), on/off switch operates the switching transients process brought can produce various interference to distribution system, cause overvoltage and overcurrent, even can propagate into far-end affects other users.
Power transformer uses one of maximum and most important power equipment in electric power system, and in the links such as generating, transmission of electricity and power transformation, all play very important effect, its stable operation decides the stable operation of electrical network.Transformer is made up of iron core and coil, utilizes electromagnetic induction principle, electric energy is changed into the components and parts of electric energy by magnetic energy.In the process of transferring energy, transformer can produce magnetic field, can occur exciting current like this in the winding of transformer.Transformer is when stable operation, and exciting current value is general all much smaller than 1/10th of its rated current.But in transformer input power system operation or when again restoring electricity, the magnetic flux produced owing to closing a floodgate at random and the remanent magnetism of transformer all likely make core sataration, and this is the basic reason that magnetizing inrush current produces.The amplitude of the higher then magnetizing inrush current of degree of core sataration is larger.
The attack time that magnetizing inrush current exists in transformer is very short, but in transformer use procedure, repeatedly charging and the impact of stress on iron core thereof be can not ignore.The number of shocks of big current is too much, and the mechanical stress of winding may be caused to damage, and serious meeting makes winding deformation or burns.Also can be very large to the contact damage of circuit breaker.Comprise DC component and the harmonic component of certain ingredients in shoving, electrical network electric energy is polluted.There is interval angle and pinnacle in inrush, this electric current directly may cause the misoperation of transformer differential protective relaying device.
Current power system proposes multiple method and shoves to suppress this, is mainly divided into external control method and internal control method.Namely external control method is shoved by the suppression that takes appropriate measures in the outside of transformer, mainly comprises soft start, low-pressure side shunt capacitance, transformer neutral point series resistance, circuit breaker switching-on resistance in parallel and phase-selecting switch technology.Internalist methodology comprises virtual breath method and changes transformer winding structure etc.
Step down side shunt capacitance method, causes based on Flux saturation the principle that the polarity of magnetizing inrush current low-pressure side magnetic flux is in addition contrary with high-pressure side.Shunt capacitance can limit the saturated of magnetic flux in winding, reduces saturation point to reach the object weakening and eliminate magnetic flux.Capacitance chose the excitation of conference on transformer impact, chooses too low, can not reach the effect of weakening, in this way to capacitance to choose requirement very high.
Resistor insertion method proposes according to the disequilibrium of three-phase transformer magnetizing inrush current, neutral point place is connected to an earth resistance, this resistance can be shared the voltage be added on iron core and bear unbalanced electric current, thus the die-away time that the saturated acceleration weakening iron core is shoved.When this method is closed a floodgate after a certain other two-phase of first closing a floodgate mutually of transformer, can cut down greatly and shove, but when three-phase carries out closing operation simultaneously, a phase current but can be made to reduce, the phenomenon that other two-phases but increase.Institute also needs further improvement in this way.
The winding method of change transformer is the distribution mode by changing primary side or secondary side winding, thus increases the equivalent inductance of transient process or magnetizing inrush current, realizes cutting down the effect of shoving.When former limit produces magnetizing inrush current, the magnetic flux in iron core is in high undersaturated condition, and at this moment iron core magnetic conductance is very close to permeability of vacuum, and former limit winding is equivalent to the air core coil not having iron core, and magnetic flux also stretches out.If from inside to outside moved by winding, the sectional area of air core coil can increase, and its inductance also can correspondingly increase thereupon, and the size of shoving there is inverse relation with equivalent inductance value, finally reduces and shove.Also the validity of the method is demonstrated in the test of multiple no-load transformer.But the insulation of the method on winding and the stable operation on transformer are all with and are served impact, the method is made also to there is certain limitation.
Summary of the invention
The invention provides a kind of transformer automatic phase selecting control method, with solve existing transformer close in process produce cut-off overvoltage, magnetizing inrush current cause disturb technical problem.
The technical solution used in the present invention is as follows:
A kind of transformer automatic phase selecting control method, method comprises:
The voltage signal of real-time detection of grid, current signal, and carry out reference voltage zero point, reference current zero-point obtaining;
Receive the action command of driving transformer action, detecting action command is reclosing command or separating brake instruction; The magnitude of voltage of the state being used for the contact of breaker of control transformer combined floodgate/separating brake by action command detection and the storage capacitor driving circuit breaker, judges whether to meet action request;
If then perform combined floodgate/sub-switching operation; Otherwise execution fault handling operation.
Further, perform combined floodgate/sub-switching operation to comprise:
For separating brake instruction, the first synchronizing relay is set according to reference current zero crossing, performs sub-switching operation;
For reclosing command, the second synchronizing relay is set according to reference voltage zero crossing, performs closing operation.
Further, the remanent magnetism after the first synchronizing relay makes transformer disconnect is minimum;
Close a floodgate when second synchronizing relay makes the pre-induction magnetic flux of transformer equal with its remanent magnetism.
Further, for three-phase transformer, perform closing operation and comprise:
Do not detect remanent magnetism control strategy, control arbitrary phase place being zero at its magnetic flux and close a floodgate, and control remaining two-phase and close a floodgate after 1/4th power frequency periods;
Detecting remanent magnetism control strategy, by detecting the remanent magnetism amount of three phase transformer iron core, controlling the closing operation of three-phase transformer.
Further, detect remanent magnetism control strategy to comprise:
If arbitrary phase remanent magnetism is zero, remaining two-phase remanent magnetism equal and opposite in direction direction is contrary, then perform rapid closing strategy, and namely remanent magnetism is the phase place combined floodgate of zero, and closes a floodgate to remaining two-phase after 1/4th power frequency periods;
Time-delay closing strategy, detects a certain phase remanent magnetism situation, and controls this and close a floodgate in the minimum phase place of remanent magnetism, and remaining two-phase selects optimum phase to close a floodgate after at least two power frequency periods;
Synchroswitching strategy is zero at a certain phase remanent magnetism, remaining two-phase remanent magnetism reach predetermined value and polarity is contrary time, then three-phase synchronous close a floodgate.
Further, being detected as by obtaining Transformer Winding voltage integrating meter of remanent magnetism, and remanent magnetism falls behind 90 degree, the phase angle of voltage.
Further, perform fault handling operation to comprise:
Disconnect the power supply being used for automatic phase selecting control device, to overhaul this device.
The present invention has following beneficial effect:
Transformer automatic phase selecting control method of the present invention, by adopting phase selection automatic switching technical controlling transformer to complete combined floodgate or separating brake in optimum phase, makes transformer switching realize shock-free seamlessly transitting.
Further, transformer phase-controlled technology effectively calculates iron core remanent magnetism amount to Transformer Winding voltage detecting, for the different situations of remanent magnetism, proposes transformer synchroswitching, postpones three kinds of Different Strategies of combined floodgate and rapid closing; Can effectively suppress transformer closing magnetizing inrush current in process, protection transformer safety is run, thus improves the stability of power supply quality and system.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of preferred embodiment of the present invention transformer automatic phase selecting control method;
Fig. 2 is the structural representation of preferred embodiment of the present invention automatic phase selecting control device;
Fig. 3 is preferred embodiment of the present invention switch phase selection Control timing sequence schematic diagram;
Fig. 4 is preferred embodiment of the present invention switch phase selection separating brake Control timing sequence schematic diagram;
Fig. 5 is preferred embodiment of the present invention transformer remanent magnetism and the relation schematic diagram cut-offfing phase angle, wherein, cut-offs phase angle schematic diagram a) for minimum remanent magnetism, cut-offs phase angle schematic diagram b) for mximum residual magnetism;
Fig. 6 is single-phase transformer phase selection moment schematic diagram;
Fig. 7 is three-phase transformer phase selection moment schematic diagram when disregarding remanent magnetism;
Fig. 8 is three-phase transformer phase selection moment schematic diagram when calculating remanent magnetism;
Fig. 9 is after A phase is closed a floodgate, B, C phase flux change schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
With reference to Fig. 1, the preferred embodiments of the present invention provide a kind of transformer automatic phase selecting control method, and the present embodiment method comprises:
Step 101, the voltage signal of real-time detection of grid, current signal, and carry out reference voltage zero point, reference current zero-point obtaining;
As the optional mode of one, with reference to Fig. 2, in figure, U (t), i (t) are voltage, the current signals of electrical network, PT is voltage transformer, CT is current transformer, the real-time detectable voltage signals of PT, the real-time sensed current signal of CT, and the signal that PT and CT detects all passes to AD sampling unit through signal condition unit, by AD sampling unit, carried out to three-phase voltage and electric current real-time zero point and detect.Because phase control techniques requires high to the accuracy of detection at zero point, by realizing accurately detecting reflection phase relation zero point, be the guarantee of phase selection reliability.Preferably, AD sampling unit adopts AD converter MAX125 to carry out the employing of voltage and current signal, and carries out logic control.
Step 102, receives the action command of driving transformer action, and detecting action command is reclosing command or separating brake instruction; The magnitude of voltage of the on off state being used for the contact of breaker of control transformer combined floodgate/separating brake by action command detection and the storage capacitor driving circuit breaker, judges whether to meet action request; If then perform step 103, otherwise perform step 104.
As the optional mode of one, with reference to Fig. 2, processor adopts DSP2812, comprise the read-only main control module storing the unit compositions such as E2PROM, random asccess memory and communication module for storing data, processor can receive long-range or local control command, judge the command information that user inputs, and calculate best switching-on phase, the separating brake phase place of phase-controlled, control circuit breaker and perform corresponding operating.Preferably, parameter information can also be uploaded to control centre by processor.
In the present embodiment, before execution combined floodgate/sub-switching operation, also according to reclosing command or the magnitude of voltage of the corresponding storage capacitor of separating brake command detection, the state of contact of breaker, when confirming that all situations all meets action request, perform combined floodgate/sub-switching operation again, otherwise abnormality is detected and investigates.Action request herein refers to: confirm that storage capacitor voltage is normal, contact of breaker position is normal.Preferably, with reference to Fig. 2, DSP main control module is through driving and safety interlocking unit controls breaker actuation, driving and safety interlocking unit comprise: On-off signal, fault alarm, Phototube Coupling unit, Phototube Coupling unit connects vacuum circuit-breaker through drive circuit, storage capacitor, and the present embodiment adopts proximity switch to detect the on off state of contact of breaker.
Step 103, performs combined floodgate/sub-switching operation;
The essence of phase-splitting switching technology is that control switch closes at reference signal optimum phase place or cut-offs.
Alternatively, with reference to Fig. 3, for reclosing command, synchronizing relay is set according to reference voltage zero crossing, performs closing operation.Control procedure can be and is divided into four steps:
1. receive reclosing command, expect and to close a floodgate at point of zero voltage;
2. control system detects point of zero voltage in real time, with previous zero crossing A for reference zero, calculates the closed required time delay at good target phase B place;
3. delay time arrives, and controller sends reclosing command;
4. close in expection phase contact.
With close compared with process at random, phase selection has closed computation delay step many, thus reaches phase control object.Alternatively, the minimum time delay that can calculate needed for Fig. 3 phase place phase selection by formula (1) is:
In formula (1), f is mains frequency, T
z1for the time of reclosing command distance synchronous reference zero, T
clsfor switch closing time, T
c1for CPU computational process required time.
Alternatively, for separating brake instruction, synchronizing relay is set according to reference current zero crossing, performs sub-switching operation.Fig. 4 is switch phase selection separating brake sequential chart, and controller is at t
2after moment receives separating brake instruction, with current zero before this for reference synchronization zero point, the preset switches arcing time is T
arc, can calculate smallest synchronization time delay by formula (2) is:
In formula (2), f is mains frequency, T
z2for the separating brake instruction distance reference point time, T
opnfor opening time, T
c2for cpu calculates required time.
Step 104, performs fault handling operation.
As the optional mode of one, execution fault handling operation is off the power supply for automatic phase selecting control device, to overhaul this device.In the present embodiment, in abnormal cases, disconnected the power supply of dsp processor by safety interlock switch, and Automatically invoked exception handles is fixed a breakdown.
From transformer hysteresis characteristic, can remain a certain amount of magnetic flux in transformer core, these magnetic fluxs are called as remanent magnetism.The influencing factor of remanent magnetism is a lot, comprising the nonlinear characteristic of core material, the equivalent stray capacitance of winding, the extraneous capacitance of transformer and circuit breaker thereof what cut-off the phase place of transformer and every phase cut-offs order, and these all may affect the size and Orientation of remanent magnetism.Generally, be present in for a long time can not Lock-out in iron core for remanent magnetism.
The transformer phase-controlled technology that the present invention proposes be exactly by remanent magnetism effectively and measure accurately, thus reach and cut down the object of transformer excitation flow.The combined floodgate magnetizing inrush current of size and Orientation to no-load transformer of remanent magnetism has and very close relationship, if transformer is used as the inductive load that has nonlinear characteristic, when dropping into no-load transformer, according to the relation of magnetic flux and voltage, the magnetic flux of different size when dropping at the out of phase angle of voltage, can be produced in the core which; If do not have remanent magnetism in iron core, the magnetic flux that input (switching angle is 90 °) encourages when voltage peak is minimum, can not produce and shove and do not have transient state directly to enter steady-working state in transformer.When there being remanent magnetism, if the magnetic flux of generation of closing a floodgate is identical with the direction of remanent magnetism, this magnetic flux increases thereupon, produces magnetizing inrush current after exceeding saturation point; If direction is contrary, then magnetic flux can be made to reduce, reducing like this shoves produces or generation that suppression is shoved.
As one preferably mode, the remanent magnetism after the synchronizing relay controlling separating brake in the present embodiment makes transformer disconnect is minimum.
Fig. 5 is remanent magnetism and the graph of a relation cut-offfing phase angle, can see that transformer cut-offs two kinds of minimum and maximum situations of rear remanent magnetism.As shown in Figure 5 after the last separating brake of no-load transformer, cut-off contacting between phase angle and transformer remanent magnetism.Figure a) shown in, B, C phase carries out separating brake at the equal place of two-phase magnetic flux, and now because the effect of A phase can make the magnetic flux of B, C phase gradually less, minimum through the remanent magnetism of 1/4 cycle three-phase is zero, now cut-offs A phase.Shown in scheming b), A, B phase is first in the equal moment disjunction of forward voltage, and after this C phase is zero (now C phase magnetic flux is maximum) disjunction in phase voltage, and now remanent magnetism situation is the most serious.
Through above-mentioned analysis, the present embodiment is for three-phase transformer, and the phase place of separating brake is preferably: two-phase carries out separating brake at the equal place of magnetic flux, through 1/4th cycles, disconnects a remaining phase.
As one preferably mode, close a floodgate when the second synchronizing relay makes the pre-induction magnetic flux of transformer equal with its remanent magnetism.
For single-phase transformer, with reference to Fig. 6, pre-induction magnetic flux and remanent magnetism, in the A point equal moment, drop into transformer, can not produce magnetizing inrush current than transformer core.
The general principle of three-phase transformer phase selection is closed a floodgate at pre-induction magnetic flux place equal to remanent magnetism, identical with single-phase principle.Independently there is not certain contact between the magnetic flux of each phase of three-phase transformer, make three-phase combined floodgate strategy also more complicated.Lower surface analysis is without remanent magnetism and the combined floodgate strategy having remanent magnetism.
As a kind of preferred implementation, not detecting remanent magnetism control strategy is: control arbitrary phase place being zero at its magnetic flux and close a floodgate, and control remaining two-phase and close a floodgate after 1/4th power frequency periods.
That A phase first puts into operation the graph of a relation of three-phase magnetic flux shown in Fig. 7 when disregarding remanent magnetism.In figure A phase magnetic flux be zero go out close a floodgate, be namely in A phase voltage peak value.Can respond to generation delayed phase A phase 180 ° of amplitudes in the iron core of B, C phase is the magnetic flux of its half.
A phase after phase selection 1/4 power frequency period, the dynamic magnetic flux produced in B, C two-phase and this two-phase this phase place go out to close a floodgate produce with to respond to magnetic flux in advance equal, namely this moment is that the best phase selection of this two-phase closes phase point.After this three-phase magnetic flux enters steady operational status according to change in voltage rule, fundamentally reaches the object eliminated and shove.
The present embodiment detects remanent magnetism control strategy: by detecting the remanent magnetism amount of three phase transformer iron core, control the closing operation of three-phase transformer.
Specifically, detect remanent magnetism control strategy to comprise:
A, rapid closing strategy
If arbitrary phase remanent magnetism is zero, remaining two-phase remanent magnetism equal and opposite in direction direction is contrary, then perform rapid closing strategy, and namely remanent magnetism is the phase place combined floodgate of zero, and closes a floodgate to remaining two-phase after 1/4th power frequency periods.
If the remanent magnetism of transformer is
a meets in optimal reclosure time action, and the magnetic flux in A phase does not suddenly change and enters stable state.In B, C phase, induction produces dynamic magnetic flux.Must be zero with the summation of iron core magnetic flux owing to responding to magnetic flux in advance, thus each power frequency period transient state magnetic flux have twice with respond to the magnetic flux equal moment in advance.
As seen from Figure 8, P, Q 2 locate two-phase pre-induction magnetic flux and dynamically magnetic flux be equal, these 2 is the best switching-on phase point of BC phase.But the impact of the dispersiveness of Q point closing moment is comparatively large, and prioritizing selection closes a floodgate at P point place, drops into after 1/4 power frequency period namely after A phase drops into.When adopting rapid closing control strategy, need know the remanent magnetism amount in three phase transformer iron core, and in rapid closing policy mandates three-phase, certain phase magnetic flux is zero, other two-phase magnetic flux equal and opposite in direction polarity are contrary.
B, time-delay closing strategy
Detect a certain phase remanent magnetism situation, and control this and close a floodgate in the minimum phase place of remanent magnetism, remaining two-phase selects optimum phase to close a floodgate after at least two power frequency periods;
In the unbalanced situation of three-phase magnetic flux, when knowing certain phase remanent magnetism in advance, if A phase drops at best switching-on phase, then can induce dynamic magnetic flux in B, C two-phase, the magnetic flux in two-phase moves along the equidirectional of magnetic hysteresis loop.After C phase magnetic flux arrives saturation point, the magnetic flux of B phase still increases along loop line direction, and does not arrive saturation region, as shown in Figure 9.Due to the induction coefficient Lc<<Lb of two phase windings, inductance value determines magnitude of voltage, namely has induced voltage to be Uc>UB.Due to the effect of winding voltage, the magnetic flux in B phase is faster than C phase flux change.Remanent magnetism in two-phase can be eliminated by very fast sensed magnetic flux, and two-phase flux areas is equal.After several power frequency periods after A phase is closed a floodgate, BC phase selects optimum phase to close a floodgate when not needing consideration remanent magnetism, and this combined floodgate strategy is called that delay is closed a floodgate tactful.
C, synchroswitching strategy,
Be zero at a certain phase remanent magnetism, remaining two-phase remanent magnetism reach predetermined value and polarity is contrary time, then three-phase synchronous closes a floodgate.
If Fig. 8, A phase is when the best closes chalaza O point combined floodgate, in the pre-induction magnetic flux of this phase place place BC phase and the amplitude approximately equal of remanent magnetism, can think at O point place it is the best switching-on phase of three-phase simultaneously.This shutting-brake control strategy is called the research synchroswitching strategy of transformer controlled switching technology.What the method was suitable for be certain phase remanent magnetism is zero, and other two-phase remanent magnetism amounts need enough large and opposite polarity situation.
In the present embodiment, being detected as by obtaining Transformer Winding voltage integrating meter of remanent magnetism, and remanent magnetism falls behind 90 degree, the phase angle of voltage.
Can be learnt by above description, the present embodiment proposes a kind of transformer phase-controlled technology, by the effectively and accurately survey calculation to remanent magnetism, control switch completes combined floodgate or separating brake in the optimum phase of voltage or electric current, makes transformer switching realize shock-free seamlessly transitting; By calculating iron core remanent magnetism amount, for the different situations of remanent magnetism, proposing transformer synchroswitching, postponing three kinds of Different Strategies of combined floodgate and rapid closing; Compared with closing a floodgate at random with routine, greatly can reduce to effectively reduce transformer and drop into the magnetizing inrush current caused, be of value to and improve the life-span of transformer and the stability of system; Be applied to automatic switching transformer, can effectively suppress transformer closing magnetizing inrush current in process, protection transformer safety is run, thus improves the stability of power supply quality and system.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a transformer automatic phase selecting control method, is characterized in that, described method comprises:
The voltage signal of real-time detection of grid, current signal, and carry out reference voltage zero point, reference current zero-point obtaining;
Receive the action command of driving transformer action, detecting described action command is reclosing command or separating brake instruction; The magnitude of voltage of the state detecting the contact of breaker being used for control transformer combined floodgate/separating brake by described action command and the storage capacitor driving described circuit breaker, judges whether to meet action request;
If then perform combined floodgate/sub-switching operation; Otherwise execution fault handling operation.
2. transformer automatic phase selecting control method according to claim 1, is characterized in that, the described combined floodgate/sub-switching operation that performs comprises:
For separating brake instruction, the first synchronizing relay is set according to described reference current zero crossing, performs sub-switching operation;
For reclosing command, the second synchronizing relay is set according to described reference voltage zero crossing, performs closing operation.
3. transformer automatic phase selecting control method according to claim 2, is characterized in that,
Remanent magnetism after described first synchronizing relay makes described transformer disconnect is minimum;
Close a floodgate when described second synchronizing relay makes the pre-induction magnetic flux of described transformer equal with its remanent magnetism.
4. transformer automatic phase selecting control method according to claim 3, is characterized in that,
For three-phase transformer, perform closing operation and comprise:
Do not detect remanent magnetism control strategy, control arbitrary phase place being zero at its magnetic flux and close a floodgate, and control remaining two-phase and close a floodgate after 1/4th power frequency periods;
Detecting remanent magnetism control strategy, by detecting the remanent magnetism amount of three phase transformer iron core, controlling the closing operation of three-phase transformer.
5. transformer automatic phase selecting control method according to claim 4, is characterized in that,
Described detection remanent magnetism control strategy comprises:
If arbitrary phase remanent magnetism is zero, remaining two-phase remanent magnetism equal and opposite in direction direction is contrary, then perform rapid closing strategy, and namely remanent magnetism is the phase place combined floodgate of zero, and closes a floodgate to remaining two-phase after 1/4th power frequency periods;
Time-delay closing strategy, detects a certain phase remanent magnetism situation, and controls this and close a floodgate in the minimum phase place of remanent magnetism, and remaining two-phase selects optimum phase to close a floodgate after at least two power frequency periods;
Synchroswitching strategy is zero at a certain phase remanent magnetism, remaining two-phase remanent magnetism reach predetermined value and polarity is contrary time, then three-phase synchronous close a floodgate.
6. transformer automatic phase selecting control method according to claim 5, is characterized in that,
Being detected as by obtaining Transformer Winding voltage integrating meter of described remanent magnetism, and described remanent magnetism falls behind 90 degree, the phase angle of voltage.
7. transformer automatic phase selecting control method according to claim 1, is characterized in that,
Described execution fault handling operation comprises:
Disconnect the power supply being used for the device that automatic phase selecting controls, to overhaul this device.
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| CN111900007A (en) * | 2020-07-29 | 2020-11-06 | 浙江方圆电气设备检测有限公司 | Method for accurately controlling phase selection closing angle |
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| CN106909088A (en) * | 2017-04-28 | 2017-06-30 | 国家电网公司 | The phase selection cyclelog of power transmission and transformation Start-up and Adjustment |
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| CN108418174A (en) * | 2018-04-13 | 2018-08-17 | 中国南方电网有限责任公司超高压输电公司曲靖局 | A kind of control strategy that circuit breaker arc when preventing filter from cutting off is restriked |
| CN110083108A (en) * | 2019-05-18 | 2019-08-02 | 南京飞兆电子科技有限公司 | One kind can split-phase operation monostable permanent-magnet switch controller and control method |
| CN110646690A (en) * | 2019-09-10 | 2020-01-03 | 国网浙江省电力有限公司电力科学研究院 | Method and system for identifying user variation relationship based on characteristic current signal |
| CN110940869A (en) * | 2019-10-22 | 2020-03-31 | 中国电力科学研究院有限公司 | Movable die test system for phase-selection switching control device of transformer |
| CN111799112A (en) * | 2020-06-09 | 2020-10-20 | 国网山东省电力公司检修公司 | Intelligent phase selection control system and method with dynamic self-adaptive function |
| CN111900007A (en) * | 2020-07-29 | 2020-11-06 | 浙江方圆电气设备检测有限公司 | Method for accurately controlling phase selection closing angle |
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