CN104078929B - Breaker, under-voltage trip gear and overvoltage under-voltage trip gear - Google Patents

Breaker, under-voltage trip gear and overvoltage under-voltage trip gear Download PDF

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Publication number
CN104078929B
CN104078929B CN201410112549.XA CN201410112549A CN104078929B CN 104078929 B CN104078929 B CN 104078929B CN 201410112549 A CN201410112549 A CN 201410112549A CN 104078929 B CN104078929 B CN 104078929B
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voltage
exciting current
low voltage
under
signal
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CN104078929A (en
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山添宏
山添宏一
田中毅
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Abstract

The under-voltage trip gear of breaker possesses:Low voltage test portion, low voltage detection is exported when source power supply voltage is under-voltage;Time delay output section, exciting current shutoff signal is exported when persistently more than the time set in advance low voltage detection is exported;And on-off circuit, based on the exciting current that the cut-out of exciting current shutoff signal is supplied to coil.Low voltage test portion generates the comparator of low voltage detection including the comparing based on comparison voltage corresponding with the grade of source power supply voltage and low voltage threshold.Time delay output section includes:Counter, counting action is carried out based on the input of low voltage detection and is exported count value as time delayed signal;Count number comparison circuit, exports the comparing of threshold value and generates exciting current shutoff signal based on time delayed signal and time delay.

Description

Breaker, under-voltage trip gear and overvoltage under-voltage trip gear
Technical field
The present invention relates to the under-voltage dropout used in the breaker and the breaker by the supply cut-out of source power supply Device and overvoltage under-voltage trip gear.
Background technology
When the supply voltage of source power supply is less than assigned voltage, the under-voltage trip gear cut-out of breaker is electric from commercialization Supply of the source to the supply voltage of load equipment.
Figure 12 represents the past case of the breaker for possessing under-voltage trip gear.From the source power supply of source power supply AC supplies Voltage VAC, rectification circuit 1 is supplied to via the sensitivity adjustment device 4 constituted with electric capacity or resistor.Rectification circuit 1 Full-wave rectification is carried out to source power supply voltage VAC and full-wave rectified voltage Vrec is generated, based on full-wave rectified voltage Vrec's Exciting current Ic is supplied to the coil 3 for being wound in fixed column 2.The capacitor that bulky capacitor is connected between the two-terminal of coil 3 is made It is delay adjustmentses device 5.
When being powered to coil 3, movable post 6 is adsorbed with fixed column 2.Movable post 6 is pulled open to from fixed column 2 by spring 7 Direction movable post 6 is exerted a force.And, after movable post 6 is pulled open in the presence of the force power of spring 7 from fixed column 2, cut-out Device 8 works and cuts off the supply voltage VL to load equipment (not shown)(Reference picture 13)Supply.
As shown in figure 13, in the under-voltage trip gear for constituting as described above, more than the fluid threshold It in coil 3 Exciting current Ic this voltage class supply source power supply voltage VAC when, movable post 6 resistance spring 7 force power and after It is continuous to be adsorbed in fixed column 2.In this condition, to load equipment supply line voltage VL.
On the other hand, source power supply voltage VAC reduction and exciting current Ic be less than threshold value It when, by applying for spring 7 Force, movable post 6 is pulled open from fixed column 2.As a result, cutting off the electricity to load equipment by the action of shearing device 8 The supply of source voltage VL.
Source power supply voltage VAC when sensitivity adjustment device 4 from fixed column 2 in order to pulling open movable post 6 etc. it is grading Row is adjusted and set.Delay adjustmentses device 5 sets stipulated time td, and the stipulated time, td was, coil 3 is exported from rectification circuit 1 When exciting current Ic is less than regulation after threshold value It, to movable post 6 is pulled open from fixed column 2 and shearing device 8 works Between td.By setting stipulated time td, make the having stable behavior of movable post 6 and shearing device 8.
Patent document 1,2 discloses the conventional structure similar with under-voltage trip gear as described above.Patent document 3 is public The under-voltage trip gear for only making exciting current be flowed in magnet exciting coil in exception is driven.
Patent document 1:Japanese Unexamined Patent Publication 2003-308775 publications
Patent document 2:Japanese Unexamined Patent Publication 2005-135690 publications
Patent document 3:Japanese Unexamined Patent Application 61-124222 publications
In under-voltage trip gear as described above, source power supply voltage when movable post 6 is pulled open from fixed column 2 The grade of VAC is driven by magnetic characteristic, shape of adsorption plane of fixed column 2 and movable post 6 etc..
Therefore, grinding, the absorption of the annealing, adsorption plane in the magnetic for forming fixed column 2 and movable post 6 In the machining of the management in the gap in face etc., it is desirable to required precision, so processing cost rises.
Additionally, being adjusted by the 4 pairs of sensitivity relative with the change of source power supply voltage VAC of sensitivity adjustment device Operation be numerous and diverse.And then, in order to ensure sufficient time-delay characteristics by delay adjustmentses device 5, it is necessary to the electric capacity of bulky capacitor Device.Therefore, larger-scale unit, and cost also rises.
The content of the invention
It is an object of the present invention to provide the stabilisation of voltage sensibility, the maintenance of time-delay characteristics, miniaturization can be sought And the breaker of the reduction of cost, under-voltage trip gear and overvoltage under-voltage trip gear.
By the first form of the invention, there is provided the under-voltage trip gear of breaker.The breaker includes being based on The cut-out of the dynamic exciting current of coil midstream and cut off the shut-off mechanism to the power supply supply of load equipment.The under-voltage is threaded off Device possesses:Low voltage test portion, when source power supply voltage is under-voltage, exports low voltage detection;Time delay output section, When persistently more than the time set in advance the low voltage detection is exported, exciting current shutoff signal is exported;And open Powered-down road, based on the exciting current shutoff signal, the exciting current of the cut-out to coil supply.The low-voltage inspection Survey portion includes comparator, and the comparator is based on comparison voltage corresponding with the grade of the source power supply voltage and low voltage threshold Comparing, generate the low voltage detection.The time delay output section includes:Counter, based on low voltage test letter Number input and carry out counting action, using count value as time delayed signal export;And count number comparison circuit, based on described Time delayed signal exports the comparing of threshold value with time delay, generates the exciting current shutoff signal.
By the second form of the invention, there is provided the overvoltage under-voltage trip gear of breaker.The breaker bag Include the cut-out based on the exciting current flowed in coil and cut off the shut-off mechanism to the power supply supply of load equipment.The mistake Voltage under-voltage trip gear possesses:Low voltage test portion with delay adjustmentses, it is defeated when source power supply voltage is under-voltage Go out low voltage detection, and when persistently more than the time set in advance the low voltage detection is exported, output the One exciting current shutoff signal;Zenith tracking portion with delay adjustmentses, exports when the source power supply voltage is overvoltage Excess voltage detection signal, and when persistently more than the time set in advance the excess voltage detection signal is exported, output second Exciting current shutoff signal;And on-off circuit, based on the described first and second exciting current shutoff signal, cut off to described The exciting current of coil supply.Prolong including low-voltage detection circuit and first in the low voltage test portion with delay adjustmentses When output circuit.The low-voltage detection circuit includes comparator, and the comparator is based on the grade with the source power supply voltage Corresponding comparison voltage and the comparing of low voltage threshold, generate the low voltage detection.The first time delay output circuit Including:Counter, the input based on the low voltage detection carries out counting action, and using count value as the first time delay Signal output;And count number comparison circuit, the comparing of threshold value is exported based on first time delayed signal and the first time delay, it is raw Into the first exciting current shutoff signal.
By the 3rd form of the invention, there is provided breaker, the breaker possesses:Coil;Shut-off mechanism, in the coil When the exciting current of middle flowing is cut off, power supply supply of the cut-out to load equipment;And above-mentioned under-voltage trip gear.
By the 4th form of the invention, there is provided breaker, the breaker possesses:Coil;Shut-off mechanism, in the coil When the exciting current of middle flowing is cut off, power supply supply of the cut-out to load equipment;And above-mentioned overvoltage under-voltage is threaded off Device.
The effect of invention
According to the present invention, in under-voltage trip gear, overvoltage under-voltage trip gear and breaker, Neng Goumou Ask maintenance, miniaturization and the reduction of cost of the stabilisation, time-delay characteristics of voltage sensibility.
Brief description of the drawings
Fig. 1 is the block diagram of the under-voltage trip gear for representing an implementation method.
Fig. 2 is the circuit diagram for representing low voltage test portion and time delay output section.
Fig. 3 is the timing waveform figure of the action for representing low voltage test portion and time delay output section.
Fig. 4 is the circuit diagram for representing on-off circuit.
Fig. 5 is the timing waveform figure of the action for representing second embodiment.
Fig. 6 is the timing waveform figure of the action for representing the 3rd implementation method.
Fig. 7 is the block diagram of the overvoltage under-voltage trip gear for representing the 4th implementation method.
Fig. 8 is the timing waveform figure of the action for representing overvoltage under-voltage trip gear.
Fig. 9 is to represent the circuit diagram with delay time setting Zenith tracking portion.
Figure 10 is the explanatory diagram of the setting for representing threshold voltage.
Figure 11 is the circuit diagram of another that represents on-off circuit.
Figure 12 is the circuit diagram for representing past case.
Figure 13 is the timing waveform figure of the action for representing past case.
Symbol description
13 ... on-off circuits,
14 ... fixed columns(Shut-off mechanism),
15 ... movable posts(Shut-off mechanism),
16 ... springs(Shut-off mechanism),
17 ... shearing devices(Shut-off mechanism),
19 ... low voltage test portions,
20 ... time delay output sections(First time delay output circuit),
21 ... comparators,
22 ... counters,
23 ... count number comparison circuits,
38 ... Zenith tracking portions,
39 ... time delay output sections(Second time delay output circuit),
AC ... source power supplies,
Vt1 ... threshold voltages(Low voltage threshold),
Vt2 ... threshold voltages(Time delay exports threshold value, the first time delay output threshold value),
Vt3 ... threshold voltages(Overvoltage threshold),
Vt4 ... threshold voltages(Time delay exports threshold value, the second time delay output threshold value),
Vd ... low voltage detections,
Vd2 ... excess voltage detection signals,
Ic ... exciting currents,
S1 ... time delayed signals(First time delayed signal),
S2 ... exciting current shutoff signals(First exciting current shutoff signal),
S3 ... time delayed signals(Second time delayed signal),
S4 ... exciting current shutoff signals(Second exciting current shutoff signal),
Vx ... branch pressure voltages(Comparison voltage).
Specific embodiment
(First embodiment)
Hereinafter, according to Fig. 1~Fig. 4, the first embodiment to the breaker for possessing under-voltage trip gear is illustrated.
As shown in figure 1, breaker 10 includes under-voltage trip gear 10A and shut-off mechanism 10B.Under-voltage trip gear 10A is connected to source power supply AC.It is whole that 11 couples of source power supply voltage VAC from source power supply AC supplies of rectification circuit carry out all-wave Stream, generation full-wave rectified voltage Vrec.
Full-wave rectified voltage Vrec is supplied to the one end for the coil 12 for being wound in fixed column 14.The other end of coil 12 connects It is connected to on-off circuit 13.Additionally, being connected in parallel to capacitor C1 between the two-terminal of coil 12.Based on full-wave rectified voltage Vrec, To the supply exciting current of coil 12 Ic.Capacitor C1 smooths exciting current Ic.
In the vicinity of fixed column 14, it is equipped with the supply based on exciting current Ic and the movable of fixed column 14 can be adsorbed in Post 15.Exerted a force to the direction that the movable post 15 is pulled open from fixed column 14 by 16 pairs of movable posts 15 of spring.Movable post 15 passes through When the force power of spring 16 is pulled open from fixed column 14, shearing device 17 works and cuts off the supply voltage VL to load equipment (Reference picture 3 and Fig. 5)Supply.In the first embodiment, with fixed column 14, movable post 15, spring 16 and shearing device 17 constitute shut-off mechanism 10B.
Full-wave rectified voltage Vrec is supplied to power circuit 18.Power circuit 18 is generated according to full-wave rectified voltage Vrec Direct current power source voltage Vc.Direct current power source voltage Vc is supplied to low voltage test portion(Low-voltage detection circuit)19 and time delay it is defeated Go out portion(Time delay output circuit)20.
As shown in figure 3, low voltage test portion 19 is based on direct current power source voltage Vc and acts.In the first embodiment, it is low Voltage detection department 19, in the branch pressure voltage Vx of full-wave rectified voltage Vrec(Reference picture 2)By H level when lower than threshold voltage vt 1 (High level)Low voltage detection Vd supply to time delay output section 20.Branch pressure voltage Vx is of comparison voltage.Threshold value Voltage Vt1 is of low voltage threshold.
Time delay output section 20, generates time delayed signal S1, and prolong based on this by being integrated to low voltage detection Vd When signal S1 and threshold voltage vt set in advance 2 comparing, to the supply of on-off circuit 13 exciting current shutoff signal S2. In one implementation method, when time delayed signal S1 reaches threshold voltage vt more than 2, exciting current shutoff signal S2 switches to L from H level Level(Low level).Threshold voltage vt 2 is of time delay output threshold value.
On-off circuit 13 cuts off exciting current Ic with when exciting current shutoff signal S2 switches to L level from H level Mode act.After cut-out exciting current Ic, shut-off mechanism 10B is by the supply to the supply voltage VL of load device (not shown) Cut-out.
Fig. 4 represents of on-off circuit 13.On-off circuit 13 includes diode D and transistor Tr3.Transistor Tr3 It is such as npn transistor.Exciting current shutoff signal S2 is supplied to the base stage of npn transistor Tr3 via diode D.Crystal The colelctor electrode of pipe Tr3 is connected with capacitor C1, and is connected with the other end of coil 12.The emitter stage and ground wire of transistor Tr3 Vg is connected.
Therefore, if exciting current shutoff signal S2 is H level, transistor Tr3 is connected and is supplied excitation to coil 12 Electric current Ic.On the other hand, when exciting current shutoff signal S2 is L level, transistor Tr3 ends and cuts off exciting current Ic.
Next, being illustrated to the configuration example in low voltage test portion 19 and time delay output section 20 according to Fig. 2.Low-voltage Test section 19 includes:Resistance R1, the R2 being serially connected;And it is connected to the comparator 21 of node between resistance R1, R2.Electricity R1, R2 are by the potential difference partial pressure of full-wave rectified voltage Vrec and ground wire voltage Vg and generate comparison voltage Vx for resistance.Comparator 21 will Comparison voltage Vx and threshold voltage vt 1 are compared, and when comparison voltage Vx is lower than threshold voltage vt 1, export the low of H level Voltage detection signal Vd.
Low voltage detection Vd is supplied to time delay output section 20 from comparator 21.Time delay output section 20 includes counter 22 and count number comparison circuit 23.Counter 22 low voltage detection Vd be H level when, based on the clock for being given Signal carries out counting action, is supplied the count value of clock signal as time delayed signal S1 to count number comparison circuit 23. Low voltage detection Vd from H level switch to L level when, counter 22 resets count value.
Therefore, during low voltage detection Vd is maintained at H level, the count value of counter 22, i.e. time delayed signal S1 Magnitude of voltage increase.
Count number comparison circuit 23 is by time delayed signal S1(The count value of clock signal)With as count threshold(Time delay is defeated Go out threshold value)Threshold voltage vt 2 be compared.Count number comparison circuit 23, in time delayed signal S1 less than threshold voltage vt 2 In the case of the exciting current shutoff signal S2 of H level is supplied to on-off circuit 13, time delayed signal S1 be threshold voltage vt 2 with The exciting current shutoff signal S2 of L level is supplied to on-off circuit 13 in the case of upper.
On-off circuit 13 ends according to the exciting current shutoff signal S2 of L level(Reference picture 3).As a result, coil 12 other end and ground wire(Vg)Between current path be cut off, exciting current Ic be cut off.
Next, the effect according to Fig. 3 to the under-voltage trip gear 10A for constituting as described above is illustrated.
This electricity of threshold voltage vt 1 is being exceeded with the wave height value of the branch pressure voltage Vx for such as being obtained from full-wave rectified voltage Vrec During pressure grade supply source power supply voltage VAC, low voltage test portion 19 exports the low voltage detection Vd of pulse type.
In a state, low-voltages of the time delayed signal S1 for exporting from the counter 22 of time delay output section 20 according to L level Detection signal Vd and periodically reset.Therefore, untill time delayed signal S1 will not count up to threshold voltage vt 2.
Therefore, exciting current shutoff signal S2 is maintained at H level, and on-off circuit 13 continues to supply exciting current to coil 12 Ic.As a result, movable post 15 maintains the state for being adsorbed in fixed column 14, shearing device 17 does not work.That is, to load device Continue supply line voltage VL.
Source power supply voltage VAC is reduced and the wave height value of the branch pressure voltage Vx of full-wave rectified voltage Vrec is less than threshold voltage During Vt1, H level is maintained at from the low voltage detection Vd of the output of low voltage test portion 19.
In this condition, the time delayed signal S1 for being exported from the counter 22 of time delay output section 20 is not reset, therefore time delay Untill signal S1 counts up to threshold voltage vt 2.
When time delayed signal S1 reaches threshold voltage vt 2, from the exciting current shutoff signal S2 of the output of time delay output section 20 Drop to L level.Therefore, by the action of on-off circuit 13, supply of the cut-out to the exciting current Ic of coil 12.Its result It is that movable post 15 is pulled open from fixed column 14, and shearing device 17 works and cuts off the supply to the supply voltage VL of load equipment.
First embodiment has the following advantages that.
(1)Reduced in source power supply voltage VAC and less than regulation grade(The judgement grade of under-voltage)Up to the stipulated time with When upper, movable post 15 is pulled open from fixed column 14 and shearing device 17 works.Therefore, it is in source power supply voltage VAC and owes electricity Load equipment action in the state of pressure, the undesirable condition thus, it is possible to occur is prevented trouble before it happens.
(2)Can be set for detecting according to the threshold voltage vt 1 of the supply of comparator 21 to low voltage test portion 19 Source power supply voltage VAC whether be under-voltage voltage sensibility.Therefore, it is possible to easily set the voltage sensibility of stabilization.
(3)It is capable of the count value of the counter 22 based on time delay output section 20 to set from source power supply voltage VAC reductions After to under-voltage, to for cutting off the exciting current shutoff signal S2 of exciting current Ic(L level)Time delay untill being output Time.Counter 22 is exported the count value of clock signal as time delayed signal S1, and count number comparison circuit 23 is based on time delay Signal S1 and threshold value Vt2's relatively exports exciting current shutoff signal S2.Therefore, it is possible to not use the capacitor of bulky capacitor In the case of set delay time, it is possible to seek the miniaturization of under-voltage trip gear 10A, and then being capable of reduces cost. Also, setting in delay time, in the setting of voltage sensibility capacitor is not used, threaded off dress therefore, it is possible to improve under-voltage Put the temperature characterisitic of 10A.
(Second embodiment)
Fig. 5 represents second embodiment.In this second embodiment, low voltage test portion 19 is configured to, low-voltage After detection signal Vd temporarily rises to H level(That is, after comparison voltage Vx is temporarily lower than threshold voltage vt 1)Stipulated time t1 Period, even if comparison voltage Vx exceedes threshold voltage vt 1, low voltage detection Vd is also maintained at H level.
By this structure, in the case of being loaded with high-frequency noise in full-wave rectified voltage Vrec, it is also possible to make low-voltage The stabilizing output level of detection signal Vd.Also, without existing for removing height in the input unit in low voltage test portion 19 The wave filter of frequency noise, so also being capable of reduces cost.
(3rd implementation method)
Fig. 6 represents the 3rd implementation method.In the third embodiment, count number comparison circuit 23 is configured to, is based on Control signal EC from external device (ED) (not shown)(Reference picture 2)Adjustment threshold voltage vt 2(Time delay exports threshold value).
By this structure, delay time can be adjusted by control signal EC, the delay time is from the low electricity of excitation Pressure detection signal Vd rises to the time after H level to exciting current shutoff signal S2 drops to L level.
(4th implementation method)
Fig. 7~Figure 10 represents the breaker 30 of the 4th implementation method.The breaker 30 of the 4th implementation method possessed electricity Pressure under-voltage trip gear 30A and shut-off mechanism 30B.Overvoltage under-voltage trip gear 30A includes:In source power supply electricity Under-voltage dropout portion of the cut-out to the supply of the supply voltage VL of load equipment when pressure VAC is reduced to under-voltage;And in commercialization Cut-out takes off to the overvoltage of the supply of the supply voltage VL of load equipment when supply voltage VAC rises to overvoltage set in advance Buckle.Under-voltage dropout portion has the function same with the under-voltage trip gear 10A of above-mentioned first embodiment.
As shown in fig. 7, overvoltage under-voltage trip gear 30A possesses:The source power supply AC of single-phase two wires, opening and closing circuit 31st, power circuit 32, voltage signal generating unit 33, the Zenith tracking portion 34 with delay adjustmentses and the low electricity with delay adjustmentses Pressure test section 35.On power circuit 32 and voltage signal generating unit 33, source power supply voltage is supplied to via opening and closing circuit 31 VAC.Power circuit 32 is based on source power supply voltage VAC generation direct current power source voltages Vc.Direct current power source voltage Vc is supplied to band The Zenith tracking portion 34 of delay adjustmentses and the low voltage test portion 35 with delay adjustmentses.
As shown in figure 8, voltage signal generating unit 33 carries out full-wave rectification and generates full-wave rectification to source power supply voltage VAC Voltage Vrec.Full-wave rectified voltage Vrec is supplied to the Zenith tracking portion 34 with delay adjustmentses and the low electricity with delay adjustmentses Pressure test section 35.
Source power supply AC is connected via opening and closing circuit 31 with one end of coil 36.The other end of coil 36 is via on-off circuit 37 and ground wire(Vg)Connection.Therefore, if on-off circuit 37 is conducting state, to the supply exciting current of coil 36 Ic.
Coil 36 is connected with shut-off mechanism 30B.Though it is not shown specifically in Fig. 7, the shut-off mechanism with first embodiment 10B(Reference picture 1)Similarly, shut-off mechanism 30B includes:It is wound with the fixed column 14 of coil 36;Movable post 15, based on to coil 36 supply exciting current Ic and be adsorbed in fixed column 14, and the cut-out based on exciting current Ic and drawn from fixed column 14 Open;Spring 16, to pull open direction movable post 15 is exerted a force,;And shearing device 17, interlocked with movable post 15.
Low voltage test portion 35 and first embodiment with delay adjustmentses(Reference picture 2)Similarly, including low-voltage inspection Survey portion 19 and time delay output section 20, to the supply exciting current shutoff signal of on-off circuit 37 S2.
In the same manner as first embodiment, the low voltage test portion 35 with delay adjustmentses, from full-wave rectified voltage Vrec When the branch pressure voltage Vx of acquisition is lower than threshold voltage vt 1, the level of time delayed signal S1 is set to increase.Also, it is in time delayed signal S1 During more than threshold value Vt2, exciting current shutoff signal S2 drops to L level.As a result, on-off circuit 37 is changed into non-conduction shape State, the supply to the exciting current Ic of coil 36 is cut off.
As shown in figure 9, the Zenith tracking portion 34 with delay adjustmentses includes Zenith tracking portion(Overvoltage detection circuit) 38 and time delay output section(Time delay detects circuit)39.Zenith tracking portion 38 includes comparator 21 and according to full-wave rectified voltage Resistance R1, R2 of Vrec generation branch pressure voltages Vx.The comparator 21 by negative side input terminal except receiving threshold voltage vt 3 And beyond by side of the positive electrode input terminal receiving comparison voltage Vx, the comparator 21 with first embodiment(Reference picture 2)It is identical. The comparator 21 in Zenith tracking portion 38 is based on the comparing of comparison voltage Vx and threshold voltage vt 3, output over-voltage detection signal Vd2.Threshold voltage vt 3 is of overvoltage threshold.
Zenith tracking portion 38, full-wave rectified voltage Vrec branch pressure voltage Vx wave height value for threshold voltage vt 3 with When upper, excess voltage detection signal Vd2 was set intermittently to rise to H level.
Time delay output section 39 and the time delay output section 20 of first embodiment(Reference picture 2)Similarly, including counter 22 With count number comparison circuit 23.Excess voltage detection signal Vd2 is supplied to counter 22.Counter 22, examines for overvoltage Surveying each rising of signal Vd2 carries out counting action, and using the count value of the excess voltage detection signal Vd2 of H level as time delay Signal S3 is exported.It is set with count number comparison circuit 23 as the threshold voltage vt 4 of count threshold.Also, time delayed signal S3(Count value)When rising and reach threshold voltage vt more than 4, count number comparison circuit 23 supplies L level to on-off circuit 37 Exciting current shutoff signal S4.By the exciting current shutoff signal S4 of the L level, on-off circuit 37 is switched to non-conduction State, the supply to the exciting current Ic of coil 36 is cut off.
After the exciting current Ic supplied to coil 36 is cut off, in the same manner as first embodiment, by shut-off mechanism 30B's acts to cut off the supply to the supply voltage VL of load equipment.
Additionally, after cut-out exciting current Ic, due to the magnetic force change occurred in coil 36, opening and closing circuit 31 becomes non- Conducting, is also turned off to power circuit 32 and the supply of voltage signal generating unit 33 source power supply voltage VAC.
On-off circuit 37 except possess diode D is selectively supplied it is a certain in exciting current shutoff signal S2, S4 The interface circuit of side(Omit diagram)Beyond this point, it is configured to the on-off circuit 13 with first embodiment(Reference picture 1 and Fig. 4)It is identical.The interface circuit supplies to on-off circuit the signal priority of in exciting current shutoff signal S2, S4, L level 37。
As shown in Figure 10, in overvoltage under-voltage trip gear 30A, by the low voltage test portion 35 with delay adjustmentses The threshold voltage vt 1 of setting is set as, fixed column cannot be used than the reduction in the exciting current Ic due to being supplied to coil 36 14 adsorb magnitude of voltage higher to the voltage Vf1 of the supply of comparator 21 during movable post 15.Additionally, the threshold voltage vt 1 is set as, Than the Zenith tracking portion 34 with delay adjustmentses and the low voltage test portion 35 with delay adjustmentses due to by source power supply voltage The reduction of the service voltage Vc from power circuit 32 that the reduction of VAC causes and the voltage voltage Vf2 of akinesia higher Value.
4th implementation method has the following advantages that.
(1)Reduced in source power supply voltage VAC and less than regulation grade(The judgement grade of under-voltage)Up to the stipulated time with When upper, movable post 15 is pulled open from fixed column 14 and shearing device 17 works.Additionally, rising in source power supply voltage VAC and big In equal to regulation grade(Overvoltage)During up to more than the stipulated time, movable post 15 is also pulled open and shearing device 17 from fixed column 14 Work.Therefore, it is possible to by load equipment source power supply voltage VAC be in the state of under-voltage or overvoltage acted and The bad of generation is prevented trouble before it happens.
(2)According to the threshold voltage vt 1 that the comparator 21 to low voltage test portion 19 is supplied, can set to source power supply Whether voltage VAC is voltage sensibility that under-voltage is detected.Similarly, according to the comparator 21 to Zenith tracking portion 38 The threshold voltage vt 3 of supply, can set to whether source power supply voltage VAC is voltage sensibility that overvoltage is detected. Therefore, it is possible to easily set the voltage sensibility of stabilization.
(3)The count value of the counter 22 based on time delay output section 20, can set from source power supply voltage VAC and be reduced to It is used to cut off the exciting current shutoff signal S2 of exciting current Ic after under-voltage, to output(L level)Untill delay time. In time delay output section 20, counter 22 exports the count value of clock signal as time delayed signal S1, and count number compares Circuit 23 is based on the comparing of time delayed signal S1 and threshold value Vt2, output exciting current shutoff signal S2.Similarly, it is defeated based on time delay Go out the count value of the counter 22 in portion 39, can set from source power supply voltage VAC rise to overvoltage after, be used for output The exciting current shutoff signal S4 of cut-out exciting current Ic(L level)Untill delay time.In time delay output section 39, count Device 22 is exported the count value of the excess voltage detection signal Vd2 of H level as time delayed signal S3, the base of count number comparison circuit 23 In the comparing of time delayed signal S3 and threshold value Vt4, output exciting current shutoff signal S4.Therefore, it is electric in low voltage test and excessively In some detection in pressure detection, delay time can be set in the case where the capacitor of bulky capacitor is not used, so The miniaturization of overvoltage under-voltage trip gear 30A can be sought, and then being capable of reduces cost.Also, due in time delay Between setting, the setting of voltage sensibility in do not use capacitor, therefore, it is possible to make overvoltage under-voltage trip gear 30A's Temperature characterisitic is improved.
In addition, above-mentioned implementation method can also be changed as follows.
The low voltage test portion 19 of first embodiment and the low voltage test with delay adjustmentses of second embodiment Portion 35, it is also possible to its virtual value is calculated by being integrated to source power supply voltage VAC, and based on the virtual value and threshold value electricity Press the comparing of Vt1, generation low voltage detection Vd.Similarly, the Zenith tracking with delay adjustmentses of second embodiment Portion 34 can also calculate its virtual value by being integrated to source power supply voltage VAC, and based on the virtual value and threshold value electricity Press the comparing of Vt3, generation excess voltage detection signal Vd2.
The low voltage test portion 19 of first embodiment and the low voltage test with delay adjustmentses of second embodiment Portion 35, it is also possible to its average value is calculated by being integrated to source power supply voltage VAC, and based on the average value and threshold value electricity Press the comparing of Vt1, generation low voltage detection Vd.Similarly, the Zenith tracking with delay adjustmentses of second embodiment Portion 34, it is also possible to its average value is calculated by being integrated to source power supply voltage VAC, and based on the average value and threshold value electricity Press the comparing of Vt3, generation excess voltage detection signal Vd2.
As shown in figure 11, the on-off circuit 13 of first embodiment and the on-off circuit 37 of second embodiment can also Replace npn transistor Tr3 using pnp transistor Tr4(Reference picture 4).In this case, via converter circuit 40, to crystal The base stage supply exciting current shutoff signal S2 of pipe Tr4(Or S4).In this configuration, in exciting current shutoff signal S2(Or S4)Rise to H level and in coil 12(Or 36)During middle flowing exciting current Ic, the base voltage of transistor Tr4 is substantially set It is set to ground wire voltage Vg.In the structure shown here, even if full-wave rectified voltage Vrec is reduced due to noise, transistor Tr4 also can It is maintained at on-state.Therefore, it is possible to stably to coil 12(Or 36)Supply exciting current Ic.

Claims (10)

1. the under-voltage trip gear of a kind of breaker, including the cut-out based on the exciting current flowed in coil and cut off right The shut-off mechanism of the power supply supply of load equipment, the under-voltage trip gear of the breaker possesses:
Low voltage test portion, when source power supply voltage is under-voltage, exports low voltage detection;
Time delay output section, when persistently more than the time set in advance the low voltage detection is exported, exports exciting current Shutoff signal;And
On-off circuit, based on the exciting current that the exciting current shutoff signal, cut-out are supplied to the coil,
The low voltage test portion includes comparator, and the comparator is based on the comparing of comparison voltage and low voltage threshold, generates institute Low voltage detection is stated, the comparison voltage is corresponding to the grade of the source power supply voltage,
The time delay output section includes:
Counter, the input based on the low voltage detection and carry out counting action, and using count value as time delayed signal Output;And
Count number comparison circuit, the comparing of threshold value is exported based on the time delayed signal and time delay, is generated the exciting current and is cut Break signal,
The low voltage test portion is configured to, the phase of the stipulated time after the comparison voltage is less than the low voltage threshold Between, the grade with the comparison voltage independently exports the low voltage detection.
2. the under-voltage trip gear of breaker as claimed in claim 1,
The count number comparison circuit is configured to, and based on the control signal supplied from external device (ED), adjusts the time delay output Threshold value.
3. the under-voltage trip gear of breaker as claimed in claim 1,
The low voltage test portion is configured to, and calculates its virtual value by being integrated to the source power supply voltage and is used as institute Comparison voltage is stated, the comparing based on the virtual value with the low voltage threshold generates the low voltage detection.
4. the under-voltage trip gear of breaker as claimed in claim 1,
The low voltage test portion is configured to, and calculates its average value by being integrated to the source power supply voltage and is used as institute Comparison voltage, and the comparing based on the average value with the low voltage threshold are stated, the low voltage detection is generated.
5. the under-voltage trip gear of breaker as claimed in claim 1,
The on-off circuit includes transistor, described to encourage when the transistor ends according to the exciting current shutoff signal Magnetoelectricity stream is cut off.
6. a kind of overvoltage under-voltage trip gear of breaker, including the cut-out based on the exciting current flowed in coil And the shut-off mechanism to the power supply supply of load equipment is cut off, the overvoltage under-voltage trip gear of the breaker possesses:
Low voltage test portion with delay adjustmentses, low voltage detection is exported when source power supply voltage is under-voltage, and When persistently more than the time set in advance the low voltage detection is exported, the first exciting current shutoff signal is exported;
Zenith tracking portion with delay adjustmentses, the output over-voltage detection signal when the source power supply voltage is overvoltage, And when persistently more than the time set in advance the excess voltage detection signal is exported, output the second exciting current cut-out letter Number;And
On-off circuit, based on the first exciting current shutoff signal and the second exciting current shutoff signal, it is right to cut off The exciting current of the coil supply,
The low voltage test portion with delay adjustmentses includes low-voltage detection circuit and the first time delay output circuit,
The low-voltage detection circuit includes comparator, and the comparator is based on the comparing of comparison voltage and low voltage threshold, generation The low voltage detection, the comparison voltage is corresponding to the grade of the source power supply voltage,
The first time delay output circuit includes:
Counter, the input based on the low voltage detection carries out counting action, and using count value as the first time delay Signal output;And
Count number comparison circuit, the comparing of threshold value is exported based on first time delayed signal and the first time delay, generates described the One exciting current shutoff signal,
The low-voltage detection circuit is configured to, the stipulated time after the comparison voltage is less than the low voltage threshold Period, the grade with the comparison voltage independently exports the low voltage detection.
7. the overvoltage under-voltage trip gear of breaker as claimed in claim 6,
The low voltage threshold is set to, when being changed into being failure to actuate due to the reduction of the exciting current than the shut-off mechanism The comparison voltage it is high and than the Zenith tracking portion with delay adjustmentses and the low-voltage with delay adjustmentses Comparison voltage when test section is changed into akinesia value high.
8. the overvoltage under-voltage trip gear of breaker as claimed in claim 6,
The Zenith tracking portion with delay adjustmentses includes overvoltage detection circuit and the second time delay output circuit,
The overvoltage detection circuit includes comparator, and the comparator is based on the comparing of comparison voltage and overvoltage threshold, generation The excess voltage detection signal, the comparison voltage is corresponding to the grade of the source power supply voltage,
The second time delay output circuit includes:
Counter, the input based on the excess voltage detection signal and carry out counting action, and using count value as the second time delay Signal output;And
Count number comparison circuit, the comparing of threshold value is exported based on second time delayed signal and the second time delay, generates described the Two exciting current shutoff signals.
9. a kind of breaker, possesses:
Coil;
Shut-off mechanism, when the exciting current that the coil midstream is moved is cut off, power supply supply of the cut-out to load equipment;And
Under-voltage trip gear any one of Claims 1 to 5.
10. a kind of breaker, possesses:
Coil;
Shut-off mechanism, when the exciting current that the coil midstream is moved is cut off, power supply supply of the cut-out to load equipment;And
Overvoltage under-voltage trip gear any one of claim 6~8.
CN201410112549.XA 2013-03-29 2014-03-25 Breaker, under-voltage trip gear and overvoltage under-voltage trip gear Active CN104078929B (en)

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