CN104410037A - Intelligent loading limit air circuit breaker - Google Patents
Intelligent loading limit air circuit breaker Download PDFInfo
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- CN104410037A CN104410037A CN201410765477.9A CN201410765477A CN104410037A CN 104410037 A CN104410037 A CN 104410037A CN 201410765477 A CN201410765477 A CN 201410765477A CN 104410037 A CN104410037 A CN 104410037A
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Abstract
The invention discloses an intelligent loading limit air circuit breaker which comprises a current transformer, a rectification filter circuit, a depressurization circuit, a single-chip microcomputer, a single port tripping module, a digital signal current detection circuit, a voltage detection circuit, an after-current detection circuit, a signal preprocessor, an A/D convertor and an analog signal current detection circuit. Compared with the prior art, the intelligent loading limit air circuit breaker has the following remarkable effects: (1)the analog signal current detection circuit is additionally arranged to realize the short trouble rapid protection scheme, and the analog signal current detection circuit is very short in response time and has the power-on time of 5 microseconds; (2) as the power supply part of a power supply adopts the self current of a frame breaker, the safe reliability of a circuit in the operating process is improved, and particularly, various strong interference from a low-voltage power grid is greatly reduced when high voltage power supply is adopted; (3) a four-port tripping module is adopted, so that the anti-interference capacity can be greatly improved.
Description
Technical field
The present invention relates to breaker technical field, particularly the intelligent limit for tonnage omnipotent breaker of one.
Background technology
Existing circuit breaker is made up of current transformer, current rectifying and wave filtering circuit, reduction voltage circuit, single-chip microcomputer, single port dropout module, digital signal formula current detection circuit, voltage detecting circuit, residual current detection circuit, signal preprocessor, A ∕ D transducer.During work, current transformer winding through phase line exports induced current, single-chip microcomputer is inputted after current rectifying and wave filtering circuit rectifying and wave-filtering and reduction voltage circuit step-down, the signal of digital signal formula current detection circuit, voltage detecting circuit, residual current detection circuit input signal preprocessor and also input single-chip microcomputer after the conversion of A ∕ D transducer respectively, after single-chip microcomputer computing, comparing process, if induced current is greater than set point, single-chip microcomputer will export a signal of telecommunication and carry out trip action to single port dropout module.
But there is following defect in above-mentioned circuit breaker:
1. can not meet the demands and power on operate time fast, for single chip circuit when powering on be guarantee electrification reset terminate after condition of work also do not set up the problem that chip cannot normally be run completely, certain delay time (such as: the electrification reset back off timer PWRT of the single-chip microcomputer of Microchip company has the delay time of 72 milliseconds) need be set; In addition for the function of each port of configuring chip and state also need have one initialized period after single-chip microcomputer puts into operation; Single-chip microcomputer with quartz crystal frequency stabilization also needs stabilization time requiring 1024 waveforms etc.; For frame circuit breaker, under some failure condition, (such as: exist under short circuit fault condition power on) requires that (<0.1 second) tripping operation reaction of threading off is just more difficult fast like this.
2. the various strong jammings from power generating facilities and power grids can be subject to during employing ac power supply.
The action of module of 3. threading off generally only adopts by the scheme of a port controlling, and this circuit is vulnerable to interference.
Summary of the invention
The object of the present invention is to provide a kind of intelligent limit for tonnage omnipotent breaker, it can meet the demands and power on operate time fast, and employing low voltage circuit components greatly reduces the various strong jammings from AC power electrical network, and greatly improves anti-interference.
Technical solution proposed by the invention is such:
A kind of intelligent limit for tonnage omnipotent breaker, comprise iron core current transformer, current rectifying and wave filtering circuit, reduction voltage circuit, single-chip microcomputer, single port dropout module, digital signal formula current detection circuit, voltage detecting circuit, residual current detection circuit, signal preprocessor, A/D converter, input keyboard, liquid crystal display, the sensor current signal exported through the iron core current transformer vice-side winding of phase line transports to the first input end of single-chip microcomputer after current rectifying and wave filtering circuit rectifying and wave-filtering and reduction voltage circuit step-down, digital signal formula current detection circuit, voltage detecting circuit, the signal that residual current detection circuit exports transports to the input of signal preprocessor respectively, the second input of single-chip microcomputer is transported to after signal preprocessor preliminary treatment and A/D converter conversion, single-chip microcomputer is through computing, relatively export actuating signal to single port dropout module first input end through the 5th output after process, input keyboard is connected with the 3rd input of single-chip microcomputer, the data of single-chip microcomputer export LCDs display to by the 6th output, also be provided with analog signal formula current detection circuit, analog signal formula current detection circuit and digital signal formula current detection circuit adopt unified signal source, this signal source provides for air-core current transformer, 7th output of single-chip microcomputer is connected with the input of analog signal formula current detection circuit, the output of analog signal formula current detection circuit is connected with single port dropout module second input, be provided with low-power consumption chopper circuit between described current rectifying and wave filtering circuit and reduction voltage circuit, described low-power consumption chopper circuit is made up of the first precision potentiometer, the second precision potentiometer, low power consumption voltage detection module, metal-oxide-semiconductor field effect transistor, also be provided with four port dropout modules, described four port dropout module installation have four input ports to go out to hold with first of single-chip microcomputer respectively, second go out to hold, the 3rd go out to hold, the 4th go out to hold) be connected, first input end mouth and the parallel connection of four-input terminal mouth, second input port and the parallel connection of the 3rd input port, be provided with four port dropout module tripping coils between first, fourth input port and second and third input port, analog signal formula current detection circuit is by signal condition unit, signal compares and recognition unit, trigger and form with dropout control unit, the signal input signal conditioning unit that described air-core current transformer vice-side winding exports, output and the signal of signal condition unit compare and are connected with the input of recognition unit, signal compares and is connected with the input of dropout control unit with triggering with the output of recognition unit, output and single port dropout module second input of described triggering and dropout control unit are connected, described single-chip microcomputer is connected with the input of dropout control unit with triggering.
Compared with prior art, the present invention has following remarkable result:
(1) the present invention is owing to having set up analog signal formula current detection circuit to realize short trouble High-Speed Protection Scheme; the analog circuit response time is extremely short; for the microsecond order of magnitude; its power-on time is 5 microseconds; namely after 5 microseconds that power on, just can make circuit normal operation input, this just accelerates the response speed of short trouble protection greatly.
(2) Power supply part adopts the mode of frame circuit breaker self electrical current, and the principle that namely load current realizes low-voltage power supply by instrument transformer greatly can simplify circuit structure, improves the security reliability that circuit is in operation; The particularly important is the various strong jammings greatly reduced from low voltage electric network when adopting high voltage supply.
(3) the present invention adopts four port dropout modules, can greatly improve its antijamming capability.
Accompanying drawing explanation
Fig. 1 is the electric theory diagram of a kind of intelligent limit for tonnage omnipotent breaker of the present invention;
Fig. 2 is the internal electrical theory diagram of the first current detection circuit shown in Fig. 1;
Fig. 3 is the internal electrical theory diagram of the low-power consumption chopper circuit shown in Fig. 1;
Fig. 4 is the internal electrical theory diagram of the second dropout module shown in Fig. 1.
Reference numeral: 1, analog signal formula current detection circuit; 2, digital signal formula current detection circuit; 3, voltage detecting circuit; 4, residual current detection circuit; 5, signal processing device; 6, A/D converter; 7, single-chip microcomputer; 8, input keyboard; 9, liquid crystal display; 10, single port dropout module; 11, four port dropout modules; 12, reduction voltage circuit; 13, low-power consumption chopper circuit; 14, current rectifying and wave filtering circuit; 15, iron core current transformer; 16, air-core current transformer; 1-1, signal condition unit; 1-2, signal compare and recognition unit; 1-3, triggering and dropout control unit; 13-1, the first precision potentiometer; 13-2, the second precision potentiometer; 13-3, low power consumption voltage detecting unit; 13-4, metal-oxide-semiconductor field effect transistor; 101, the first output; 102, the second output; 103, the 3rd output; 104, the 4th output; 105, the 5th output; 106, the 6th output; 107, the 7th output; 201, first input end; 202, the second input; 203, the 3rd input; TQ1, single port dropout module tripping coil; TQ2, four port dropout module tripping coils.
Embodiment
By embodiment below, the present invention's intelligence limit for tonnage omnipotent breaker is further elaborated.
Shown in Fig. 1 ~ 4, a kind of intelligent limit for tonnage omnipotent breaker, comprise iron core current transformer 15, current rectifying and wave filtering circuit 14, reduction voltage circuit 12, single-chip microcomputer 7, single port dropout module 10, digital signal formula current detection circuit 2, voltage detecting circuit 3, residual current detection circuit 4, signal preprocessor 5, A/D converter 6, input keyboard 8, liquid crystal display 9, the sensor current signal exported through iron core current transformer 15 vice-side winding of phase line transports to the first input end 201 of single-chip microcomputer 7 after current rectifying and wave filtering circuit 14 rectifying and wave-filtering and reduction voltage circuit 12 step-down, digital signal formula current detection circuit 2, voltage detecting circuit 3, the signal that residual current detection circuit 4 exports transports to the input of signal preprocessor 5 respectively, the second input 202 of single-chip microcomputer 7 is transported to after signal preprocessor 5 preliminary treatment and A/D converter 6 are changed, single-chip microcomputer 7 is through computing, relatively export actuating signal to single port dropout module 10 first input end through the 5th output 105 after process, input keyboard 8 is connected with the 3rd input 203 of single-chip microcomputer 7, the data of single-chip microcomputer 7 export LCDs 9 to by the 6th output 106 and show, also be provided with analog signal formula current detection circuit 1, analog signal formula current detection circuit 1 and digital signal formula current detection circuit 2 adopt unified signal source, this signal source provides for air-core current transformer 16, 7th output 107 of single-chip microcomputer 7 is connected with the input of analog signal formula current detection circuit 1, the output of analog signal formula current detection circuit 1 is connected with single port dropout module 10 second input.When a short circuit occurs, analog signal formula current detection circuit can output signal and make single port dropout module tripping coil TQ1 action, realizes 5 microseconds and can respond power-off.
Be further used as preferred embodiment, be provided with low-power consumption chopper circuit 13 between described current rectifying and wave filtering circuit 14 and reduction voltage circuit 12, described low-power consumption chopper circuit 13 is made up of the first precision potentiometer 13-1, the second precision potentiometer 13-2, low power consumption voltage detection module 13-3, metal-oxide-semiconductor field effect transistor 13-4.The iron core current transformer output of being powered by three three-phase currents exports+24 volt supply voltages through the both positive and negative polarity of bridge heap rectification output end by two series diodes and after capacitor filtering.For avoiding exporting too high voltage time phase current excessive (such as: load-side short circuit), the full-wave rectified voltage signal of bridge heap output is adopted to go to modulate and be connected in the metal-oxide-semiconductor field effect transistor that rectification exports both positive and negative polarity.Its operation principle is as follows:
Exporting as the Vout of the low power consumption voltage detecting unit HT7050A-1 of " voltage monitor " when also comparatively foot bridge heap output voltage is yet low for phase current is zero, therefore metal-oxide-semiconductor field effect transistor is in closed condition, when phase current increase makes the voltage of its Vin input reach 5 volts, the output open circuit of HT7050A-1, the grid being added in metal-oxide-semiconductor field effect transistor just becomes a full wave rectified signal, but now metal-oxide-semiconductor field effect transistor not becomes the state of full conducting, but be in a kind of full wave rectified signal inputted by its grid modulate.Because the conducting voltage of metal-oxide-semiconductor field effect transistor is about 3.3 volts.At the beginning of conducting, the modulated degree of depth of metal-oxide-semiconductor field effect transistor is also more shallow; If phase current continues to increase, the modulated degree of depth of metal-oxide-semiconductor field effect transistor is darker.
Because metal-oxide-semiconductor field effect transistor is attempted by rectification to export positive and negative end, a kind of like this circuit just can play and suppress the transition along with the increase of phase current of bridge heap voltage to rise.
The output port of HT7050A-1 is the metal-oxide-semiconductor field effect transistor of " open-drain ".When Vin input voltage is less than 5 volts, this output mos field effect transistor is in " conducting state "; When Vin input voltage is greater than 5 volts, this output mos field effect transistor just becomes " cut-offfing state ".
Described first precision potentiometer 13-1, the second precision potentiometer 13-2 are for regulating the fiducial value of current rectifying and wave filtering circuit 14 voltage.
Be further used as preferred embodiment, intelligence limit for tonnage omnipotent breaker is also provided with four port dropout modules 11, described four port dropout modules 11 are provided with four input ports and go out end 101, second respectively with first of single-chip microcomputer 7 and go out end 102, the 3rd and go out end 103, the 4th and go out end 104 and be connected, first input end mouth and the parallel connection of four-input terminal mouth, second input port and the parallel connection of the 3rd input port, be provided with four port dropout module tripping coil TQ2 between first, fourth input port and second and third input port.No matter four port dropout module tripping coil TQ2 two ends polarity (that is: " the left negative right side just " or " left positive right negative "), just can action as long as pass to 24 volts.If four input ports of four port dropout modules 11: first, fourth input port be 0 and second and third input port be 1 or first, fourth input port be 1 and second and third input port be 0 all can make four port dropout module tripping coil TQ2 actions; Other state of four ports all can not make four port dropout module tripping coil TQ2 actions; An of short duration disturbing pulse more can not make its action.
Be further used as preferred embodiment, analog signal formula current detection circuit 1 is by signal condition unit 1-1, signal compares and recognition unit 1-2, trigger and form with dropout control unit 1-3, the signal input signal conditioning unit 1-1 that described air-core current transformer 16 vice-side winding exports, the output of signal condition unit 1-1 compares with signal and is connected with the input of recognition unit 1-2, signal compares and is connected with the input of dropout control unit 1-3 with triggering with the output of recognition unit 1-2, output and single port dropout module 10 second input of described triggering and dropout control unit 1-3 are connected, described single-chip microcomputer 7 is connected with the input of dropout control unit 1-3 with triggering.
Described analog signal formula current detection circuit 1 structure is simple, is made up of following five parts:
1. input, provides current detection signal by the secondary of air-core current transformer 16;
2. signal condition unit 1-1, the add circuit be made up of operational amplifier forms buffering, the scale amplifying of three-phase current signal, carries out identifying and the signal with appropriate level compared for late-class circuit with combining and export;
3. signal compares and recognition unit 1-2, by having the comparator of certain " threshold value " for identifying whether input signal reaches the level of " short-circuit current ".If higher than this value, then export high level and by constant-current circuit, capacitor charged; Due in normal condition, the output of comparator is in zero level state all the time, generally not easily be interfered, even if there is indivedual interference, because on have the restriction of constant-current circuit, under have the existence of the clamping action of comparator output terminal zero level and the integrating capacitor of rear end also can be unlikely to enter into the input of rear class circuits for triggering by greatly suppressing.
4. trigger and dropout control unit 1-3, the level that the output signal amplitude of prime comparator need reach 1/2 supply voltage (2.5 volts) just can be identified and trigger is overturn.Owing to have employed 555 ripe chips, the stability of circuit is guaranteed.
5. tripping coil drives, and adopts field effect transistor to drive to be conducive to the consistency ensureing trip action function (then may be subject to the impact of self current amplification factor and variations in temperature and not too reliable as adopted transistor; Interference is then vulnerable to) as adopted controllable silicon.
As working properly after powering on, then console controller as required by diode by the input clamper of trigger in low level, i.e. the function of this module of maskable.When console controller lost efficacy, this analog circuit will recover the function of " short-circuit protection " automatically.
Claims (4)
1. an intelligent limit for tonnage omnipotent breaker, comprise iron core current transformer (15), current rectifying and wave filtering circuit (14), reduction voltage circuit (12), single-chip microcomputer (7), single port dropout module (10), digital signal formula current detection circuit (2), voltage detecting circuit (3), residual current detection circuit (4), signal preprocessor (5), A/D converter (6), input keyboard (8), liquid crystal display (9), the sensor current signal exported through iron core current transformer (15) vice-side winding of phase line transports to the first input end (201) of single-chip microcomputer (7) after current rectifying and wave filtering circuit (14) rectifying and wave-filtering and reduction voltage circuit (12) step-down, digital signal formula current detection circuit (2), voltage detecting circuit (3), the signal that residual current detection circuit (4) exports transports to the input of signal preprocessor (5) respectively, second input (202) of single-chip microcomputer (7) is transported to after signal preprocessor (5) preliminary treatment and A/D converter (6) conversion, single-chip microcomputer (7) is through computing, relatively export actuating signal to single port dropout module (10) first input end through the 5th output (105) after process, input keyboard (8) is connected with the 3rd input (203) of single-chip microcomputer (7), the data of single-chip microcomputer (7) export LCDs (9) display to by the 6th output (106), it is characterized in that: be also provided with analog signal formula current detection circuit (1), analog signal formula current detection circuit (1) and digital signal formula current detection circuit (2) adopt unified signal source, this signal source is that air-core current transformer (16) provides, 7th output (107) of single-chip microcomputer (7) is connected with the input of analog signal formula current detection circuit (1), the output of analog signal formula current detection circuit (1) is connected with single port dropout module (10) second input.
2. intelligent limit for tonnage omnipotent breaker according to claim 1, it is characterized in that: be provided with low-power consumption chopper circuit (13) between described current rectifying and wave filtering circuit (14) and reduction voltage circuit (12), described low-power consumption chopper circuit (13) is made up of the first precision potentiometer (13-1), the second precision potentiometer (13-2), low power consumption voltage detection module (13-3), metal-oxide-semiconductor field effect transistor (13-4).
3. intelligent limit for tonnage omnipotent breaker according to claim 1, it is characterized in that: be also provided with four port dropout modules (11), described four port dropout modules (11) are provided with four input ports and go out to hold (101) with first of single-chip microcomputer (7) respectively, second goes out end (102), 3rd goes out end (103), 4th goes out end (104) is connected, first input end mouth and the parallel connection of four-input terminal mouth, second input port and the parallel connection of the 3rd input port, first, four-input terminal mouth and second, four port dropout modules tripping coil (TQ2) are provided with between three input ports.
4. intelligent limit for tonnage omnipotent breaker according to claim 1, it is characterized in that: analog signal formula current detection circuit (1) is by signal condition unit (1-1), signal compares and recognition unit (1-2), trigger and form with dropout control unit (1-3), the signal input signal conditioning unit (1-1) that described air-core current transformer (16) vice-side winding exports, output and the signal of signal condition unit (1-1) compare and are connected with the input of recognition unit (1-2), signal compares and is connected with the input of dropout control unit (1-3) with triggering with the output of recognition unit (1-2), output and single port dropout module (10) second input of described triggering and dropout control unit (1-3) are connected, described single-chip microcomputer (7) is connected with the input of dropout control unit (1-3) with triggering.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410765477.9A CN104410037B (en) | 2014-12-15 | 2014-12-15 | Intelligent limit for tonnage omnipotent breaker |
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| CN201410765477.9A CN104410037B (en) | 2014-12-15 | 2014-12-15 | Intelligent limit for tonnage omnipotent breaker |
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| CN104410037B CN104410037B (en) | 2017-11-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7265959B2 (en) * | 2005-01-25 | 2007-09-04 | Yazaki North America, Inc. | Solid state switch with quasi-predictive short circuit protection and thermal protection |
| CN101106262A (en) * | 2007-01-26 | 2008-01-16 | 西安交通大学 | Dual core intelligent communication control for plastic shell low voltage breaker |
| CN102386608A (en) * | 2011-11-25 | 2012-03-21 | 佛山市佛电电器有限公司 | Intelligent lightning protection residual current circuit breaker |
| CN203056660U (en) * | 2013-01-23 | 2013-07-10 | 南京信息工程大学 | Intelligent charger for electric car |
-
2014
- 2014-12-15 CN CN201410765477.9A patent/CN104410037B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7265959B2 (en) * | 2005-01-25 | 2007-09-04 | Yazaki North America, Inc. | Solid state switch with quasi-predictive short circuit protection and thermal protection |
| CN101106262A (en) * | 2007-01-26 | 2008-01-16 | 西安交通大学 | Dual core intelligent communication control for plastic shell low voltage breaker |
| CN102386608A (en) * | 2011-11-25 | 2012-03-21 | 佛山市佛电电器有限公司 | Intelligent lightning protection residual current circuit breaker |
| CN203056660U (en) * | 2013-01-23 | 2013-07-10 | 南京信息工程大学 | Intelligent charger for electric car |
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