CN103840470B - A kind of breaker closing phase control method, Apparatus and system - Google Patents
A kind of breaker closing phase control method, Apparatus and system Download PDFInfo
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- CN103840470B CN103840470B CN201210477475.0A CN201210477475A CN103840470B CN 103840470 B CN103840470 B CN 103840470B CN 201210477475 A CN201210477475 A CN 201210477475A CN 103840470 B CN103840470 B CN 103840470B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention provides a kind of breaker closing phase control method, Apparatus and system, the method comprises: the voltage signal obtaining bus; Judge whether voltage signal reaches peak value, if it is control the breaker closing in long transmission line, if otherwise circuit breaker be failure to actuate.To solve the DC offset problem of shunt compensation circuit, improve breaker apparatus reliability of operation.
Description
Technical field
The present invention relates to superhigh pressure long distance transmission line technology, particularly the phase control closing technology of superhigh pressure long distance transmission line, specifically a kind of breaker closing phase control method, Apparatus and system.
Background technology
Superhigh pressure long distance transmission line often adopts high-voltage shunt reactor to carry out the capacitive reactive power of balanced circuit generation, to increase the conveying capacity of circuit, improves the power-frequency overvoltage situation of circuit simultaneously.Reactor capacity choose the reactive balance situation usually depending on circuit capacity current and local system.From the angle of reactive power compensation, high resistance capacity more close to the capacitive reactive power of circuit, to improving reactive balance and over-voltage condition is more favourable.If but line charging is idle too small with the difference of high resistance capacity, when circuit is from one end sky charging, the power frequency component of line current is very little.Because the electric current flowing through reactor can not suddenly change, larger direct current can be produced in its charging process, when electric current power frequency component is much smaller than DC component, close in ceases to be busy operation rear significant period of time (hundreds of millisecond), flow through the zero crossing that the electric current of circuit breaker is unstable, cause the DC offset problem of shunt compensation circuit sky charging stream.If now because a variety of causes circuit breaker carries out sub-switching operation, may can not arc extinguishing in time after circuit breaker arrives point position, the arcing of lasting hundreds of milliseconds by scaling loss arc control device internal components, deteriorated SF6 gas, and likely develops into larger fault.
Summary of the invention
The invention provides a kind of breaker closing phase control method, Apparatus and system, to solve the DC offset problem of shunt compensation circuit, improve breaker apparatus reliability of operation.
The object of the invention is, provide a kind of breaker closing phase control method, the method comprises: the voltage signal obtaining bus; Whether the voltage signal described in judgement reaches peak value, if it is controls the breaker closing in long transmission line, if otherwise circuit breaker be failure to actuate.
The voltage signal obtaining bus comprises: the ACB three-phase voltage signal obtaining bus successively; Judge whether A phase voltage signal reaches peak value, if it is the A phase breaker closing in long transmission line is controlled, control the C phase breaker closing in long transmission line through 60 ° after A phase breaker closing, after C phase breaker closing, control the B phase breaker closing in long transmission line through 60 °.
Breaker closing phase control method comprises: the current break signal obtaining long transmission line; Obtain the ON time of circuit breaker from the actual conducting to loop of initial combined floodgate according to current break signal, and according to ON time, feedback check is carried out to circuit breaker.
The object of the invention is, provide a kind of breaker closing phase control device, this device comprises: voltage signal input unit, for obtaining the voltage signal of bus; Phase control unit, for judging whether voltage signal reaches peak value, if it is sends shutting-brake control instruction to the circuit breaker in long transmission line.
The object of the invention is, provide a kind of breaker closing phase control system, this system comprises: circuit breaker and breaker closing phase control device; Circuit breaker is connected with breaker closing phase control device; Breaker closing phase control device comprises: voltage signal input unit, for obtaining the voltage signal of bus; Phase control unit, for judging whether voltage signal reaches peak value, if it is sends shutting-brake control instruction to the circuit breaker in long transmission line; Electric current input unit, for obtaining the current break signal of long transmission line; Feedback check unit, for obtaining the ON time of circuit breaker from the actual conducting to loop of initial combined floodgate according to current break signal, and sends feedback check signal according to ON time to circuit breaker.
Beneficial effect of the present invention is: by adopting combined floodgate phase control techniques, suppresses the direct current closing ceases to be busy generation, thus the risk avoiding direct current biasing to produce; Make after conjunction ceases to be busy that circuit breaker is under any condition during separating brake, circuit breaker current has stable zero crossing, ensures that circuit breaker reliably cut-offs, improves the safety operation level of circuit breaker.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those skilled in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the breaker closing phase control method flow chart of the embodiment of the present invention;
Fig. 2 is the three-phase breaker switching-on phase control method flow chart of the embodiment of the present invention;
Fig. 3 is the circuit switching-on phase of the embodiment of the present invention and the relation oscillogram of zero-crossing timing;
Fig. 4 is the breaker closing time controling oscillogram of the embodiment of the present invention;
Fig. 5 is the current waveform figure of embodiment of the present invention current break;
Fig. 6 is the structured flowchart of the breaker closing phase control device of the embodiment of the present invention;
Fig. 7 is the structured flowchart of the three-phase breaker switching-on phase control device of the embodiment of the present invention;
Fig. 8 is the circuit theory diagrams of the breaker closing phase control device of the embodiment of the present invention;
Fig. 9 is the circuit theory diagrams of the breaker closing phase control system of the embodiment of the present invention;
Figure 10 is the application schematic diagram of the breaker closing phase control system of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the breaker closing phase control method of the present embodiment comprises: the voltage signal (step S101) obtaining bus; Judge whether voltage signal reaches peak value, if it is control the breaker closing in long transmission line, if otherwise circuit breaker is failure to actuate (step S102).
As shown in Figure 2, the three-phase breaker switching-on phase control method of the present embodiment specifically comprises: the ACB three-phase voltage signal (step S201) obtaining bus successively; Judge whether A phase voltage signal reaches peak value, if it is the A phase breaker closing in long transmission line is controlled, control the C phase breaker closing in long transmission line through 60 ° after A phase breaker closing, after C phase breaker closing, control the B phase breaker closing (step S202) in long transmission line through 60 °.Obtain the current break signal (step S203) of long transmission line; Obtain the ON time of circuit breaker from the actual conducting to loop of initial combined floodgate according to current break signal, and according to ON time, feedback check (step S204) is carried out to circuit breaker.
In breaker closing phase control method, inventor is by finding the mechanism of band shunt compensation circuit direct current biasing generation and the research of influencing factor, the size of circuit switching generation direct current biasing is relevant with the compensativity of shunt reactor, switching-on phase and breaker closing resistance configuration situation, and the switching-on phase by controlling circuit breaker in the constant situation of other conditions effectively can suppress the phenomenon of direct current biasing.
When line-breaker does not have switching-on resistance, the amplitude of switching current DC component becomes sinusoidal rule to change with switching-on phase.When head end busbar voltage represents with sinusoidal form, switching-on phase is that the DC component produced 0 ° and 180 ° (namely during busbar voltage zero passage) is maximum, equals the peak value flowing through reactor alternating current; Switching-on phase be 90 ° and 270 ° (i.e. busbar voltage peak value) time produce DC component be zero.Then the zero-crossing timing of breaker closing after-current just has direct relation with switching-on phase: the DC component that produces of closing a floodgate under a phase bit is less than circuit when remaining the peak value of alternating current component, and switching current has stable zero crossing.As shown in Figure 3, certain circuit switching-on phase is between-20 ~ 20 ° and 160 ~ 200 °; When switching angle is positioned at other phase place, DC component is greater than alternating current component, and combined floodgate after-current does not all stablize zero crossing at short notice.That is, if control switching-on phase, three-phase is closed a floodgate in one-period respectively, three-phase switching-on phase is the phase place of the quick zero passage of energy, then direct current biasing can be avoided circuit breaker " to close and divide " risk caused operated.
The requirement of switching-on phase control method to circuit breaker totally has the following aspects:
1) closing time is stablized.The mechanical handling stability of breaker closing phase control and circuit breaker, breaker mechanism time response at different temperatures, circuit breaker pre arcing time characteristic and the operating time of circuit breaker under different control voltage, different institutions pressure are closely related.By to breaker mechanical time response test under normal temperature, obtain probability distribution and the deviate of closing time.
Closing time average μ:
Sample variance:
Standard deviation=0.209ms.
Obtain 3 σ=0.209 × 3=0.627ms.
Meet the requirement defining permission action deviation 3 σ≤± 1.5ms in international conference on large HV electric systems CIGRE guide.
2) mechanical performance can effectively not estimated by surrounding environment influence or environmental impact.By to breaker mechanic property compatibility test under condition of different temperatures, obtain the fundamental test data of the closing time in breaker mechanic property by the impact of ambient temperature factor.And be input in phase selecting switching-on apparatus and carry out numerical compensation.
3) the pre-arcing time and the arcing time short.Close pre arcing time characteristic research (RDDS) test by charged, obtain the curve of dielectric strength reduction rate between fracture, thus obtain the pre arcing time when out of phase is closed a floodgate.When phase selection operates, mechanical closing time is removed the pre arcing time that closes a floodgate in this phase place to determine the best switching-on phase of phase selection.
4) close a floodgate without overshoot.By breaker mechanical time response test under different control voltage, different hydraulics, draw the closing time curve under different control voltage, different operating oil pressure.
As shown in Figure 4, according to the above-mentioned analysis for direct current biasing mechanism of production and influencing factor, control circuit breaker and close a floodgate when busbar voltage reaches peak value the DC component of generation can be made minimum.If all closed a floodgate in the positive peak moment according to three-phase, then the maximum not same period that three-phase closes a floodgate will reach about 13.3ms.For the problem that the not same period of closing a floodgate is excessive, adopt the strategy that three-phase closes a floodgate according to ACB order in the present embodiment, namely A phase is after just (or negative) polarity peak is closed a floodgate, reach negative (or just) polarity peak through 60 ° of C phase voltages to close a floodgate, just reaching (or negative) polarity peak through 60 ° of B phase voltages again to close a floodgate, thus the theory that three-phase is closed a floodgate not the same period time shorten to 6.7ms, ensure to suppress the validity of direct current biasing simultaneously.
As shown in Figure 5, the actual turn-on instant in loop can be judged by the voltage of circuit or current break.Because circuit breaker current is always zero before the conducting of loop, and completely not by the interference of adjacent phase, be conducive to the realization of mutation criteria.Therefore in the present embodiment, adopt current break as the foundation judging the actual conducting in loop, and carry out corresponding feedback element setting.
As shown in Figure 6, the breaker closing phase control device 100 of the present embodiment comprises: voltage signal input unit 101, for obtaining the voltage signal of bus; Phase control unit 102, for judging whether voltage signal reaches peak value, if it is sends shutting-brake control instruction to the circuit breaker in long transmission line.
As shown in Figure 7, the three-phase breaker switching-on phase control device 100' of the present embodiment comprises: voltage signal input unit 101', obtains the ACB three-phase voltage signal of bus successively; Phase control unit 102', whether the A phase voltage signal described in judgement reaches peak value, if it is the A phase circuit breaker in phase long transmission line sends shutting-brake control instruction, send shutting-brake control instruction through 60 ° to the C phase circuit breaker in long transmission line after A phase breaker closing, after C phase breaker closing, send shutting-brake control instruction through 60 ° to the B phase circuit breaker in long transmission line.Current signal input unit 103', for obtaining the current break signal of described long transmission line; Feedback check unit 104', for obtaining the ON time of circuit breaker from the actual conducting to loop of initial combined floodgate according to current break signal, and sends feedback check signal according to ON time to circuit breaker.
As shown in Figure 8, the breaker closing phase control device physical circuit realizing the present embodiment comprises: CPU (CPU), ac input division divide (current signal input and voltage signal input), transmitter, expansion board and power panel.Wherein: ac input division divide have three-phase current input, bus A phase voltage input, bus B phase voltage input and bus C phase voltage input.Expansion board has A phase close a floodgate output, C phase of output, B phase of closing a floodgate and to close a floodgate output.Power panel has power supply input (220DC/AC) and fault alarm and protection act relay signal and exports.
As shown in Figure 9, Figure 10, the breaker closing phase control system of the present embodiment, comprising: circuit breaker and breaker closing phase control device; Circuit breaker is connected with breaker closing phase control device; Breaker closing phase control device comprises: voltage signal input unit, for obtaining the voltage signal of bus; Phase control unit, for judging whether described voltage signal reaches peak value, if it is sends shutting-brake control instruction to the circuit breaker in long transmission line; Electric current input unit, for obtaining the current break signal of described long transmission line; Feedback check unit, for obtaining the ON time of circuit breaker from the actual conducting to loop of initial combined floodgate according to described current break signal, and sends feedback check signal according to described ON time to described circuit breaker.Voltage signal input unit obtains the ACB three-phase voltage signal of bus successively; Phase control unit judges whether A phase voltage signal reaches peak value, if it is the A phase circuit breaker in phase long transmission line sends shutting-brake control instruction, send shutting-brake control instruction through 60 ° to the C phase circuit breaker in long transmission line after A phase breaker closing, after C phase breaker closing, send shutting-brake control instruction through 60 ° to the B phase circuit breaker in long transmission line.
The application of the combined floodgate phase-control device of the present embodiment makes to close a floodgate shoving of causing and overvoltage reduces greatly, is conducive to the stable of whole electrical network, thus reduces construction and the maintenance cost of electric power system.Due to the application of combined floodgate phase-control device, make cancellation circuit-breaker switching on-off resistance and related control device become possibility, thus greatly can simplify the internal structure of circuit breaker, improve equipment dependability and reduce production cost.According to statistics, the switching-on resistance of circuit breaker and related control device account for 8% ~ 10% of whole circuit breaker cost.Reduce the electric wearing and tearing of contact of breaker during disjunction, reduce the possibility that contact of breaker is restriked, extend useful life and the maintenance period of breaker apparatus.For closing for Capacitor banks or transformer, the application of phase control technology can reduce shoves, and makes the insulating structure design of capacitor or transformer become relatively simple, is also easier to the fault distinguishing protected.For extra-high voltage grid AC system, the application of switching-on phase control device significantly can reduce the insulating requirements of the extra-high voltage electric power equipment such as circuit, thus simplifies the design of grid structure and compact line.
Apply specific embodiment in the present invention to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. a breaker closing phase control method, is characterized in that, described method comprises:
Obtain the voltage signal of bus;
Whether the voltage signal described in judgement reaches peak value, if it is controls the breaker closing in long transmission line, if otherwise described circuit breaker be failure to actuate;
Obtain the current break signal of described long transmission line;
Obtain the ON time of circuit breaker from the actual conducting to loop of initial combined floodgate according to described current break signal, and according to described ON time, feedback check is carried out to described circuit breaker.
2. breaker closing phase control method according to claim 1, is characterized in that, the voltage signal of described acquisition bus comprises: the ACB three-phase voltage signal obtaining bus successively;
Whether the A phase voltage signal described in judgement reaches peak value, if it is the A phase breaker closing in long transmission line is controlled, control the C phase breaker closing in long transmission line through 60 ° after A phase breaker closing, after C phase breaker closing, control the B phase breaker closing in long transmission line through 60 °.
3. a breaker closing phase control device, is characterized in that, described device comprises:
Voltage signal input unit, for obtaining the voltage signal of bus;
Phase control unit, for judging whether described voltage signal reaches peak value, if it is sends shutting-brake control instruction to the circuit breaker in long transmission line;
Current signal input unit, for obtaining the current break signal of described long transmission line;
Feedback check unit, for obtaining the ON time of circuit breaker from the actual conducting to loop of initial combined floodgate according to described current break signal, and sends feedback check signal according to described ON time to described circuit breaker.
4. breaker closing phase control device according to claim 3, is characterized in that, described voltage signal input unit obtains the ACB three-phase voltage signal of bus successively;
Whether the A phase voltage signal described in described phase control unit judges reaches peak value, if it is the A phase circuit breaker in phase long transmission line sends shutting-brake control instruction, send shutting-brake control instruction through 60 ° to the C phase circuit breaker in long transmission line after A phase breaker closing, after C phase breaker closing, send shutting-brake control instruction through 60 ° to the B phase circuit breaker in long transmission line.
5. a breaker closing phase control system, is characterized in that, described system comprises: circuit breaker and breaker closing phase control device;
Described circuit breaker is connected with breaker closing phase control device;
Described breaker closing phase control device comprises:
Voltage signal input unit, for obtaining the voltage signal of bus;
Phase control unit, for judging whether described voltage signal reaches peak value, if it is sends shutting-brake control instruction to the circuit breaker in long transmission line;
Electric current input unit, for obtaining the current break signal of described long transmission line;
Feedback check unit, for obtaining the ON time of circuit breaker from the actual conducting to loop of initial combined floodgate according to described current break signal, and sends feedback check signal according to described ON time to described circuit breaker.
6. breaker closing phase control system according to claim 5, is characterized in that, described voltage signal input unit obtains the ACB three-phase voltage signal of bus successively;
Whether the A phase voltage signal described in described phase control unit judges reaches peak value, if it is the A phase circuit breaker in phase long transmission line sends shutting-brake control instruction, send shutting-brake control instruction through 60 ° to the C phase circuit breaker in long transmission line after A phase breaker closing, after C phase breaker closing, send shutting-brake control instruction through 60 ° to the B phase circuit breaker in long transmission line.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377705B (en) * | 2014-09-05 | 2017-02-15 | 山东理工大学 | Peak closing method for reactive compensation capacitor bank |
| CN104360157B (en) * | 2014-11-10 | 2017-01-25 | 国家电网公司 | Transformer interval breaker closing phase detection method |
| CN105071368B (en) * | 2015-09-01 | 2018-02-09 | 国家电网公司 | A kind of breaker phased suppressing method of transmission line of electricity switching overvoltage |
| CN107680853B (en) * | 2017-09-14 | 2019-04-09 | 南京南瑞继保电气有限公司 | Pre arcing time prediction technique based on breaker RDDS Parameter Self-learning |
| CN109188261B (en) * | 2018-08-27 | 2021-08-20 | 国网河南省电力公司电力科学研究院 | Signal peak value triggering method for simulating opening and closing actions of high-voltage circuit breaker in laboratory |
| CN112733391B (en) * | 2021-04-06 | 2021-08-06 | 国网江西省电力有限公司电力科学研究院 | Circuit breaker closing time estimation method based on distance power inverse ratio method |
| CN114047435B (en) * | 2021-10-27 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and device for testing switching-on time discreteness of circuit breaker |
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| CN201266570Y (en) * | 2008-08-15 | 2009-07-01 | 西安市创元电器科技有限责任公司 | Controller for selecting phase of high voltage AC circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201266570Y (en) * | 2008-08-15 | 2009-07-01 | 西安市创元电器科技有限责任公司 | Controller for selecting phase of high voltage AC circuit breaker |
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| 断路器的相位控制技术及应用;娄殿强等;《高压电器》;20080831;第44卷(第4期);第353-355页 * |
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