CN101226859B - Double coil various current control method for vacuum breaker permanent magnetism mechanism - Google Patents
Double coil various current control method for vacuum breaker permanent magnetism mechanism Download PDFInfo
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- CN101226859B CN101226859B CN200710018617A CN200710018617A CN101226859B CN 101226859 B CN101226859 B CN 101226859B CN 200710018617 A CN200710018617 A CN 200710018617A CN 200710018617 A CN200710018617 A CN 200710018617A CN 101226859 B CN101226859 B CN 101226859B
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Abstract
Disclosed is a current varying control method of double-coil of permanent mechanisms of vacuum circuit breakers. In closing process, a trip coil is reversely galvanized to offset a part of permanent magnet retaining force, to reduce closing action current, simultaneously adjust the current of a closing coil, and reduce iron core kinetic energy on the premise of ensuring instantaneous closing speed. In switching off time, the trip coil is directly galvanized, the closing coil is reversely galvanized or the trip coil is directly galvanized and the closing coil is directly galvanized. Voltage and current of the trip coil and the closing coil are sampled by a coil current measuring module, and collected data is fed back to a central control module. A central treatment module calculates rate of current change in current coils and adjusts current value in the trip coil according to calculated result. The invention adjusts current amplitude in coils by sampling feedback of current and voltage of the trip coil and the closing coil of a permanent mechanism, and enables the operating characteristic of the permanent mechanism and the spring load characteristic of the circuit breaker to realize ideal engagement.
Description
Technical field
The invention belongs to electronic application field, be specifically related to a kind of double coil various current control method for vacuum breaker permanent magnetism mechanism.
Background technology
Bistable-state permanent magnet mechanism is a kind of novel operating mechanism at vacuum circuit-breaker design, because of its high reliability and branch, the dispersed little extensive concern that is subjected to of closing time, and pressure field in being widely used in.Its main motion characteristic is: after separating brake or switching signal sent, power supply was given switching winding or closing coil power supply, and the electromagnetic force that is produced by coil overcomes counter-force and permanent magnetism confining force, drove iron core and then drove contact of breaker and finish branch, closing operation.After action is finished, provide confining force by permanent magnet, make contact be in the state of closure or shutoff.
The operating state of permanent magnet mechanism can be divided into combined floodgate, separating brake and maintenance.In the closing operation process, need provide electromagnetic force to the logical enough electric currents of coil, overcome the confining force of permanent magnet, drive the iron core action.Be used for the more circuit breaker of voltage levels if will have bistable-state permanent magnet mechanism now, because the increase of stroke, magnetic resistance increases, need bigger drive current to satisfy the speed characteristics requirement of circuit breaker, existing capacitances to supply power mode, so big electric current can't be provided, thereby limit the application of permanent magnet mechanism on the voltage levels circuit breaker.The separating brake process is different with making process in addition, because the existence of the circuit breaker counter-force and the excess of stroke can cause starting current not enough, the problem of iron core actuating force sudden change makes speed characteristic curve present saddle-shape, influences just-off speed.If sudden change is serious, also has the possibility of separating brake failure.Another major issue that exists in branch, the making process is that operate time is long.The circuit breaker of voltage levels requires responsiveness faster, under the certain condition of number of ampere turns, in order suitably to reduce electric current, can only increase the number of turn, coil turn is many more, and inductance is big more, electric current rises to time of action request electric current also can be long more, cause operate time long, will cause branch, the dispersed increase of closing time, can't satisfy the requirement that close synchronous pass.
Existing mechanism design, generally pay close attention to the reasonability of structure, make the characteristic of the characteristic of permanent magnet mechanism and vacuum circuit-breaker good fit, but it is excessive obviously can't to overcome electric current according to traditional unicoil control strategy, operate time is long, the defective that just-off speed is not enough.
Summary of the invention
The object of the present invention is to provide and a kind ofly can improve the permanent magnet mechanism movement travel, optimize just divide, just sum velocity; Reduce in the closing course contact bounce; Reduce operating current and the double coil various current control method for vacuum breaker permanent magnetism mechanism of operate time.
For achieving the above object, the technical solution used in the present invention is: 1) at first, after switching signal sends, the energising of closing coil forward, switching winding are oppositely switched on, by the coil current measurement module to minute, the voltage of closing coil, electric current samples, and the data that collect are fed back to central control module, central processing module calculate current coil in current changing rate, and be according to the current value of adjusting in the coil closing coil with result of calculation; 2) electric current in closing coil reaches set point value, turn-offs switching winding, changes the sense of current of switching winding simultaneously, guarantees the normal of sub-switching operation next time; 3) judge whether that according to position switch combined floodgate puts in place, put in place, cut off the electric current of closing coil, change the sense of current of closing coil simultaneously if close a floodgate; 4) process of separating brake: A switching winding forward energising, closing coil is energising or the energising of B switching winding forward oppositely, the energising of closing coil forward, by the coil current measurement module to minute, the voltage of closing coil, electric current samples, and the data that collect are fed back to central control module, central processing module calculate current coil in current changing rate, and be with result of calculation according to the current value of adjusting in the coil switching winding; For option A, the electric current in switching winding reaches set point value, turn-offs closing coil, changes the sense of current of closing coil simultaneously, guarantees the normal of closing operation next time; For option b, the electric current in switching winding reaches set point value, turn-offs closing coil, but does not change the sense of current of closing coil; Judge whether that according to position switch separating brake puts in place,, cut off the electric current of switching winding, change the sense of current of switching winding simultaneously if separating brake puts in place.
After switching signal sends, closing coil forward energising, switching winding oppositely switch on (forward and oppositely all be with respect to minute, closing coil sense of current when the operate as normal, for example switching winding is when sub-switching operation, the electric current of clear and coherent hour hands, then clockwise direction is a positive direction, is in the other direction counterclockwise.Closing coil and switching winding are similar.Main coil and ancillary coil are defined as, the switching winding circle of serving as theme during sub-switching operation, closing coil is an ancillary coil, and the definition of closing operation is similar), to minute, the voltage of closing coil, current sample, feed back to central control module, constantly adjust the current value in the coil, the electric current in switching winding reaches characteristic value, turn-offs switching winding, change the sense of current of switching winding simultaneously, guarantee the normal of sub-switching operation next time.According to position switch judge whether close a floodgate and put in place.In case put in place, cut off the electric current of closing coil, change the sense of current of closing coil simultaneously.The process of separating brake has two kinds of controlling schemes, first kind of controlling schemes, and the energising of switching winding forward, closing coil is oppositely switched on, and need change the sense of current simultaneously behind complete operation; Second kind of controlling schemes, the energising of switching winding forward, the energising of closing coil forward, but closing coil does not need to change the sense of current behind complete operation.All the other steps and making process are similar.
By to the voltage of permanent magnet mechanism branch, closing coil, the sampling feedback of electric current, calculate current coil in current changing rate, constantly adjust the current amplitude in the coil.The operating characteristics that makes permanent magnet mechanism reaches desirable with the spring load characteristic of circuit breaker and cooperates.
In making process, switching winding is oppositely switched on, offset part permanent magnetism confining force, reduce the feed motion electric current, constantly regulate the electric current of closing coil simultaneously, in the prerequisite that guarantees firm sum velocity, reduce iron core kinetic energy and impact velocity to reduce or to eliminate operating mechanism in vibration, spring that closed moment produces, improve the electric life of circuit breaker.
At sub-switching operation two kinds of different schemes are arranged.First kind of scheme, the energising of switching winding forward, closing coil is oppositely switched on, branch, the added voltage difference of closing coil, electric current is also just different, has guaranteed the desired just-off speed of circuit breaker so on the one hand, on the other hand owing to offset permanent magnetism power, avoid the sudden change of the force characteristic that the existence owing to the excess of stroke causes, avoided the iron core speed characteristic curve to present saddle-shape.The all forward energisings of second kind of scheme, branch, closing coil, branch, the added voltage difference of closing coil, conduction time is also different, owing to improved the confining force of closing position, improve the separating brake starting current accordingly like this, also can realize improving the purpose of just-off speed.
Since the design of twin coil power supply, two coil effects of cooperatively interacting in the course of action, and the number of turn of required branch, closing coil reduces.Coil turn reduces, and inductance reduces, and the coil current climbing speed strengthens, and electric current reaches the operating current required time to be reduced, and then minimizing divides, feed motion total time.
Description of drawings
Fig. 1 is a control circuit block diagram of the present invention;
Fig. 2 is the circuit diagram of control capacitance monitoring modular 4 of the present invention and charging module 3;
Fig. 3 is the circuit diagram of driver module 12,14 of the present invention;
Fig. 4 is a current switching module 16-relay control mode circuit diagram of the present invention;
Fig. 5 is a current switching module 16-H bridge control mode circuit diagram of the present invention;
Fig. 6 is the circuit diagram of coil current measurement module 23 of the present invention;
Fig. 7 is a displacement-time curve of the present invention;
Fig. 8 is coil current-time graph of the present invention;
Fig. 9 is permanent magnetism power-stroke curve of the present invention;
Figure 10 is a coil current change curve of the present invention;
Figure 11 is a PWM voltage-regulation pattern of the present invention.
Embodiment
Tool is described in further detail the present invention below in conjunction with accompanying drawing.
Referring to Fig. 1, the present invention includes the rectification filtering module 2 that is connected with AC power 1, the output of this rectification filtering module 2 is connected with the current input terminal of charging module 3, the output of charging module 3 is connected with the input of control capacitance 5, the pressure feedback port of control capacitance 5 is connected with the input of control capacitance detection module 4, the signal output part of capacitive detection module 4 links to each other with the signal input part of charging module 3, another output of capacitive detection module 4 links to each other with the signal input part of the central processing module 9 that is used to monitor control capacitance detection module 4 states, the current output terminal of control capacitance 5 is by power switch pipe 13,15 and current switching module 16 be connected with closing coil 20 with switching winding 19, the current feedback signal of switching winding 19 and closing coil 20 offers central processing module 9 by coil current measurement module 23, central processing module 9 is by driver module 12,14 with power switch pipe 13,15 are connected, be used to regulate power switch pipe 13,15 PWM duty ratio, central processing module 9 also links to each other with the control power supply 6 that power supply is provided for it, being used for input divides, the switching value 7 of closing operation signal is isolated 8 through photoelectricity and is input to central processing module 9, the input of central processing module 9 also is connected with the temperature sensor 10 that is used for the circuit breaker intelligence operation, the input of central processing module 9 also be used for judge dividing, the position switch 11 whether closing operation puts in place is connected.Temperature sensor 10 measures ambient temperature wherein, coil current measurement module 23 measure divide, closing coil electric current and voltage, position switch 11 is used for determining to divide, whether close a floodgate puts in place; Driver module 12,14 output PWM ripple power controlling switching tubes 13,15 regulating winding electric currents, current switching module 16 is used for the switching coil sense of current, realizes the control strategy of twin coil power supply.
Closing operation, making process will guarantee firm sum velocity on the one hand, speed again can not be too fast on the other hand, simultaneously can not be excessive for the circuit breaker operating current that adapts to big stroke.As shown in Figure 9, the relation of permanent magnetism power and stroke determines, so if can be in the process of the closing a floodgate suitable permanent magnetism power that reduces will help to close a floodgate.Shown in Figure 10,11, after switching signal sends, power switch pipe 13 conductings of control closing coil 20, closing coil 20 energisings, making process begins.Meanwhile, the also conducting of power switch pipe 15 of control switching winding 19, switching winding 19 is used to offset a part of permanent magnetism power by an electric current opposite with its operating current direction.To time T1, change the break-make frequency of the power switch pipe 15 of control switching winding 19, and then change the electric current of switching winding 19, the frequency of the break-make of power switch pipe 15 can be determined in advance according to Fig. 9.When arriving the Te time, turn-off the power switch pipe 15 of control switching winding 19, stop power supply.Adopt the power supply of this kind method, because the participation of switching winding 19 is arranged, reduced the permanent magnetism confining force, do not need huge starting current, mean that also closing coil 20 numbers of turn can reduce simultaneously, the actuation duration also just can reduce.And because the reducing of starting current, the speed of moving iron core motion also can correspondingly reduce, and reduces impact velocity.
Result according to experiment and simulation calculation, branch wire time and capacitance voltage and ambient temperature have definite rule, so need provide different control signal duty ratios under different voltages and the condition of different temperatures, these data be deposited in the flash memory (Flash) of control module.After separating brake or switching signal sent, at first the capacitance voltage of detection control coil and ambient temperature by searching the tables of data among the Flash, were determined the duty ratio of control signal then.By power switch pipe control branch, closing coil work, determine the frequency and the time of break-make according to the duty ratio of determining by the size of current sensor senses coil current.As Figure 10, when the electric current of main coil reaches a and begins to descend, the switching tube frequency change of control ancillary coil, meanwhile timer is started working, change the frequency of the switching tube of once controlling ancillary coil at set intervals, this frequency is come out according to Fig. 9 calculated in advance, deposits Flash in.When the time arrives Te, cut off the electric current of ancillary coil, change the direction of the winding current simultaneously.Continue to detect the size of current of main coil, when electric current reaches b and begins to increase, the detection position signal.If arrived branch, closing position, cut off main coil current, change the direction of the winding current, divide, close a floodgate and finish.The existing problem of sub-switching operation is different with closing operation.Because the existence of the excess of stroke, the counter-force of circuit breaker will be offset a big chunk permanent magnetism confining force, the not enough problem of confining force that this need overcome with regard to having caused starting current.When moving iron core has been crossed the excess of stroke, owing to lost the counter-force of circuit breaker, permanent magnetism power does not reduce again, is added on the moving iron core having a reverse power, has a strong impact on just-off speed.Addressed this problem two thinkings, the one, temporarily strengthen closing retention force, improve starting current, and then improve electromagnetic force, improve just-off speed; The 2nd, balance out part permanent magnetism power, identical like this electric current, the speed of iron core is faster, and can not cross the excess of stroke, and saddle-shaped problem appears in speed characteristics.Corresponding to these two kinds of thinkings, two kinds of controlling schemes are proposed.First kind of controlling schemes, the energising of switching winding forward, closing coil is oppositely switched on, and control procedure and making process are similar; Second kind of controlling schemes, the energising of switching winding forward, also forward energising of closing coil, control procedure and making process are similar.That need to change is the T1 and Te conduction time of ancillary coil.
After switching signal sends, closing coil 20 forwards energisings, switching winding 19 oppositely switch on (forward and oppositely all be with respect to minute, closing coil sense of current when the operate as normal, for example switching winding is when sub-switching operation, the electric current of clear and coherent hour hands, then clockwise direction is a positive direction, is in the other direction counterclockwise.Closing coil and switching winding are similar.Main coil and ancillary coil are defined as, the switching winding circle of serving as theme during sub-switching operation, closing coil is an ancillary coil, and the definition of closing operation is similar), to minute, the voltage of closing coil, current sample, feed back to central control module 9, constantly adjust the current value in the coil, the electric current in switching winding 19 reaches characteristic value, turn-offs switching winding 19, change the sense of current of switching winding 19 simultaneously, guarantee the normal of sub-switching operation next time.According to position switch 11 judge whether close a floodgate and put in place.In case put in place, cut off the electric current of closing coil 20, change the sense of current of closing coil 20 simultaneously.The process of separating brake has two kinds of controlling schemes, first kind of controlling schemes, and the energising of switching winding 19 forwards, closing coil 20 is oppositely switched on; Second kind of controlling schemes, the energising of switching winding 19 forwards, the energising of closing coil 20 forwards.All the other steps and making process are similar.
Referring to Fig. 2, AC power 1 of the present invention is input to the elementary of transformer T, transformer T secondary be connected to rectification filtering module 2 electric bridge 1,3 inputs, 2 ends of the electric bridge of rectification filtering module 2 are connected to 1 end of the thyristor BT151 of charging module 3 by current-limiting resistance R1,2 ends of thyristor BT151 are connected to 1 end of control capacitance C1, and the input 2 of control capacitance C1 is connected to the output 3 of electric bridge.Voltage on the control capacitance C1 is by sampling resistor R2, R3 offers 5 ends of the comparator C J339A of control capacitance detection module 4,4 ends of comparator C J339A link to each other with the 9V power supply, 2 ends of comparator C J339A are exported to 8 ends of control capacitance detection module CJ339B by resistance R 5,9 ends of comparator C J339B are through divider resistance R6, R7 links to each other with the 9V power supply, control capacitance C1 is also by sampling resistor R2,7 ends of R3 and voltage comparator CJ339C, 6 ends of voltage comparator CJ339C are connected to one through resistance R 9, on the 9V power supply of R10 dividing potential drop, 1 end of voltage comparator CJ339C is exported to 2 ends of optocoupler 4N25A, 4 ends of optocoupler 4N25A send the I/O port 92 of a signal to central processing module 9, are used for the fault alarm of control capacitance C1.Alternating current is imported half-wave rectifying circuit after by the transformer pressure regulation, offers control capacitance then.By sampling resistor R1 and R2, obtain the voltage at electric capacity two ends, be transported to the feedback circuit of forming by two comparator C J339A and CJ339B, when capacitance voltage was lower than a certain set point, conducting thyristor BT151 charged to electric capacity automatically.The voltage that sampling resistor is obtained is converted into a level signal through comparator C J339C and is defeated by main control part, the warning when being used for the electric capacity fault through the light idol.Sampled voltage also is used to detect branch, the voltage when closing a floodgate among the A/D by LM358 input main control part.
Referring to Fig. 3, the PWM port 45 of this central processing module 9 is connected to 2 ports of optocoupler 4N25B, 3 ends of optocoupler 4N25B are connected to the B end of the first triode T1 of driver module 12, the C end and the second triode T2 of the first triode T1, the B end of the 3rd triode T3 links to each other, the C end of the second triode T2 links to each other with the 12V power supply, the C end of the 3rd triode T3 is connected to simulation ground, the first triode T1, the E end of the 3rd triode T3 links to each other with 1 end of power switch pipe IGBT1, and 3 ends of power switch pipe IGBT1 link to each other with 1 end of the C1 of control capacitance.
Referring to Fig. 4,2 ends of power switch pipe IGBT1 of the present invention link to each other with 7 ends of the relay R ELAY of current switching module 16,8 ends of relay R ELAY link to each other with simulation ground, 9 of relay R ELAY, 12 ports link to each other with 1 end of coil COIL, 10 of relay R ELAY, 11 ports are connected with 2 ends of coil COIL, the PWM port 46 of central processing module 9 links to each other with 2 ends of optocoupler 4N25C, 3 ends of optocoupler 4N25C link to each other with 6 ends of the relay R ELAY of current switching module 16, and 4 ends of optocoupler 4N25C link to each other with simulation ground.
The current switching module is to realize the committed step of twin coil power supply, time-dependent current control.The present invention provides two kinds of current switch circuits, a kind of mapping mode that adopts relay, and the another kind of IGBT of employing constitutes the mode of H bridge.Each is beneficial for dual mode, can be selected according to cost and practical application.Central processing module 9 sends switching command, gets the isolated controlling relay coil through the light idol, further the electric current input direction of control coil.For fear of relay-operated dispersiveness, need take at control strategy with on the operating time.Be exactly specifically, when stay coil and ancillary coil finish the work finish after, change relay status at once.The benefit of this kind method is that peripheral circuit is simple, is convenient to realize that shortcoming is to be not easy to realize more complicated control strategy.
Referring to Fig. 5,2 ends of power switch pipe IGBT1 of the present invention link to each other with 1 end of 3 ends of power switch pipe IGBT3, coil COIL, 2 ends of 2 ends of power switch pipe IGBT2 and 3 ends of IGBT4, coil COIL link to each other, 1 end of power switch pipe IGBT respectively with the I/O93 of central processing module 9,94,95,98 ports link to each other.
Referring to Fig. 6,1,2 end of coil COIL of the present invention is connected respectively to 4 of current transformer CT, 3 ends, 1,2 termination of current transformer CT is gone into 2 of amplifier LM358,3 ends, one end are input to the A/D174 port of central processing module 9, are used for the measurement of coil current.
When the needs sub-switching operation, we claim serve as theme circle and claim that closing coil is an ancillary coil of switching winding, if closing operation then opposite.Consider the situation of separating brake, the electromagnetic force that switching winding provides need overcome the confining force of permanent magnet, and drives the iron core motion.And on the other hand, can not too reduce confining force, otherwise will cause the not enough problem of just-off speed because of the minimizing of starting current.Closing a floodgate also has same problem.The duty ratio of the PWM ripple of choose reasonable control ancillary coil is very important thus.
The time-dependent current of realization coil is controlled, and needs to change the duty ratio of the PWM ripple of controlling IGBT, but the opportunity of selection change duty ratio is very important.Before the iron core setting in motion, coil current reaches peak, along with the motion of iron core, electric current begins again to descend, simultaneously as can be known according to Fig. 1, and after air gap appears in static iron core and moving iron core, permanent magnetism power descends rapidly, need come the duty ratio of the PWM ripple of conversion control ancillary coil according to the change of permanent magnetism power.The present invention's main coil current Changing Pattern of giving chapter and verse is judged the method on the opportunity that changes PWM ripple duty ratio.As Fig. 2,, when electric current arrival a point begins to descend, change duty ratio by the current sensor senses main coil current.The separating brake process is owing to the existence of the excess of stroke, and duty ratio changes time retardation Δ t.Then by timer, each a period of time, changes one time duty ratio, change certain number of times after, the shutoff ancillary coil.Begin again to rise when main coil current arrives c point electric current, need to judge the position switch signal this moment, if divide, combined floodgate puts in place, then cuts off main coil current.
If adopt the scheme of the relay control coil sense of current, must consider the opportunity that relay changes.Because the dispersiveness of relay, if do not take in because open, the break time is extremely short, this programme just can not be realized.A method that addresses this problem is after the ancillary coil electric current is cut off, to change the state of relay at once.After the same electric current when main coil is cut off, also change relay status at once.
Control method of the present invention is as follows:
The test card open-wire line circle actuation duration accounts for the major part of the total time of circuit breaker branch, combined floodgate, is the effective way that reduces branch, closing time so effectively reduce the actuation duration.Reducing the actuation duration has two approach: 1 reduces the excitation coil number of turn.After other parameter of permanent magnet mechanism was determined, coil turn was few more, and resistance, inductance are more little, and the steepness that electric current rises is also just big more, and the time that rises to identical starting current is also just short more; 2 reduce starting current.If the reduction starting current also just means the confining force that need be reduced in branch, closing position, starting current also just can decrease.
Above-mentioned two kinds of methods all have its pluses and minuses.Method 1, though reduce operate time, because coil turn reduces, resistance reduces, starting current increases, this is disadvantageous to designing big range permanent magnetism mechanism, because the required confining force of big range permanent magnetism mechanism is huge, corresponding starting current is also just very big, control circuit can't bear, and, increase the weight of the spring of the fashionable contact of circuit breaker closing because excessive starting current can cause the too fast problem of firm sum velocity.Method 2, reduce operate time, starting current reduces, but for sub-switching operation, because the existence of breaker contact overtravel, the power that the required confining force that overcomes provides for permanent magnet during the electromagnetic force separating brake deducts the counter-force of touch spring, causes confining force less, the starting current deficiency, the problem that speed is not enough.
The existing problem of sub-switching operation is different with closing operation.Because the existence of the excess of stroke, the counter-force of circuit breaker will be offset a big chunk permanent magnetism confining force, the not enough problem of confining force that this need overcome with regard to having caused starting current.When moving iron core has been crossed the excess of stroke, owing to lost the counter-force of circuit breaker, permanent magnetism power does not reduce again, is added on the moving iron core having a reverse power, has a strong impact on just-off speed.Addressed this problem two thinkings, the one, temporarily strengthen closing retention force, improve starting current, and then improve electromagnetic force, improve just-off speed; The 2nd, balance out part permanent magnetism power, identical like this electric current, the speed of iron core is faster, and can not cross the excess of stroke, and saddle-shaped problem appears in speed characteristics.Corresponding to these two kinds of thinkings, two kinds of controlling schemes are proposed.First kind of controlling schemes, the energising of switching winding forward, closing coil is oppositely switched on, and control procedure and making process are similar; Second kind of controlling schemes, the energising of switching winding forward, also forward energising of closing coil, control procedure and making process are similar.That need to change is the T1 and Te conduction time of ancillary coil.
Claims (2)
1. double coil various current control method for vacuum breaker permanent magnetism mechanism is characterized in that:
1) at first, after switching signal sends, the oppositely energising of the energising of closing coil (20) forward, switching winding (19), by coil current measurement module (23) to minute, the voltage of closing coil, electric current samples, and the data that collect are fed back to central processing module (9), central processing module (9) calculates the current changing rate in the current coil, and is the current value in the foundation adjustment closing coil (20) with result of calculation;
2) electric current in closing coil (20) reaches set point, cuts off the electric current of switching winding (19), changes the sense of current of switching winding (19) simultaneously, guarantees the normal of sub-switching operation next time;
3) judge whether that according to position switch (11) combined floodgate puts in place, put in place, cut off the electric current of closing coil (20), change the sense of current of closing coil (20) simultaneously if close a floodgate;
4) process of separating brake:
The energising of switching winding (19) forward, closing coil (20) is energising oppositely, by coil current measurement module (23) to minute, the voltage of closing coil, electric current samples, and the data that collect are fed back to central processing module (9), central processing module (9) calculates the current changing rate in the current coil, and is the current value in the foundation adjustment switching winding (19) with result of calculation; Electric current in switching winding (19) reaches set point, cuts off the electric current of closing coil (20), changes the sense of current of closing coil (20) simultaneously, guarantees the normal of closing operation next time; Judge whether that according to position switch (11) separating brake puts in place,, cut off the electric current of switching winding (19), change the sense of current of switching winding (19) simultaneously if separating brake puts in place.
2. double coil various current control method for vacuum breaker permanent magnetism mechanism is characterized in that:
1) at first, after switching signal sends, the oppositely energising of the energising of closing coil (20) forward, switching winding (19), by coil current measurement module (23) to minute, the voltage of closing coil, electric current samples, and the data that collect are fed back to central processing module (9), central processing module (9) calculates the current changing rate in the current coil, and is the current value in the foundation adjustment closing coil (20) with result of calculation;
2) electric current in closing coil (20) reaches set point, cuts off the electric current of switching winding (19), changes the sense of current of switching winding (19) simultaneously, guarantees the normal of sub-switching operation next time;
3) judge whether that according to position switch (11) combined floodgate puts in place, put in place, cut off the electric current of closing coil (20), change the sense of current of closing coil (20) simultaneously if close a floodgate;
4) process of separating brake:
The energising of switching winding (19) forward, the energising of closing coil (20) forward, by coil current measurement module (23) to minute, the voltage of closing coil, electric current samples, and the data that collect are fed back to central processing module (9), central processing module (9) calculates the current changing rate in the current coil, and is the current value in the foundation adjustment switching winding (19) with result of calculation; Electric current in switching winding (19) reaches set point, cuts off the electric current of closing coil (20), but does not change the sense of current of closing coil (20); Judge whether that according to position switch (11) separating brake puts in place,, cut off the electric current of switching winding (19), change the sense of current of switching winding (19) simultaneously if separating brake puts in place.
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| CN102931023B (en) * | 2012-11-13 | 2015-05-27 | 北京交通大学 | Realization of control method and device for vacuum circuit breaker based on coil current |
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| CN1674188A (en) * | 2005-04-18 | 2005-09-28 | 西安交通大学 | Method for switch-on under-voltage protection and switch-off raising just-off speed of permanent magnetic mechanism contactor |
| CN1917116A (en) * | 2006-09-04 | 2007-02-21 | 沈阳工业大学 | Servo control device and method for position of moving contact in high voltage breaker |
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