CN101414743A - Electronic less/over-voltage protective device for low-voltage circuit breaker and control method thereof - Google Patents
Electronic less/over-voltage protective device for low-voltage circuit breaker and control method thereof Download PDFInfo
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- CN101414743A CN101414743A CNA2008101536025A CN200810153602A CN101414743A CN 101414743 A CN101414743 A CN 101414743A CN A2008101536025 A CNA2008101536025 A CN A2008101536025A CN 200810153602 A CN200810153602 A CN 200810153602A CN 101414743 A CN101414743 A CN 101414743A
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- circuit breaker
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Abstract
The present invention relates to a low-voltage circuit breaker electronic undervoltage and overvoltage protection device and a control method. The device consists of voltage transformers of A, B, C, N phases on the incoming end of an acquisition circuit breaker, a precise operational amplifier, an electronic strobe switch, a single-chip microcomputer, a relay and a circuit breaker executive mechanism. Voltage transformers of A, B, C phases input a voltage signal to the input ports of the precise operational amplifier; the precise operational amplifier inputs the signal after the treatment to the I/O port of the single-chip microcomputer through the electronic strobe switch; the single-chip microcomputer measures the signal of each phase and compares with the qualified range value in a logic program; if one phase signal is not qualified, the single-chip microcomputer outputs the signal to the relay through the I/O port; the NC node of the relay is connected to a switch opening executive mechanism of the relay. The intelligent device with the microprocessor as the core, plus the control flow procedures of the microprocessor, can improve the sampling precision and ensure the action reliability of low-voltage circuit breaker.
Description
Technical field
The invention belongs to a kind of circuit breaker, particularly relate to a kind of low-voltage circuit breaker electronic undervoltage, over-pressure safety device and control method.
Background technology
The low-voltage electrical apparatus of China has experienced years development history, and qualitative leap has all been arranged from the functional type to the mass property.Short circuit and overload protection are the traditional protection forms of low-voltage electrical apparatus, and voltage protection is not to take much count of, and the circuit that has is also just protected under voltage, but owe, the overvoltage fault can not make the load reliably working equally.And traditional under-voltage release all is to adopt electromagnetic system to realize, get dead electricity by solenoid and control moving iron core, thus the action of control circuit breaker.This structure has two kinds of shortcomings, and the one, it is contained on the breaker mechanism, is used with mechanism, sometimes moving unshakable in one's determination can the blocking with mechanism of under-voltage release; The 2nd, its power line has only two lines, can only formula detect zero line and live wire or live wire and live wire; Certain limitation is so just arranged, and the every phase of three-phase power line all voltage failure might appear in the reality.
Summary of the invention
The present invention provides a kind of low-voltage circuit breaker electronic undervoltage, over-pressure safety device and the control method that can carry out under-voltage/over-voltage protection to every phase fault in supply line's three-phase for solving the technical problem that exists in the known technology.
The technical scheme that the present invention takes for low-voltage circuit breaker electronic undervoltage, over-pressure safety device for the technical problem that exists in the solution known technology is: it includes the actuator of voltage transformer, precision operational-amplifier, electronic strobe switch, single-chip microcomputer, relay and the automatic change-over of gathering circuit breaker end of incoming cables A, B, C, each phase of N; Described A, B, C threephase potential transformer are input to voltage signal each input port of described precision operational-amplifier; Signal after precision operational-amplifier will be handled is input to the I/O port of described single-chip microcomputer through electronic strobe switch; Described single-chip microcomputer is every phase signals being measured and being compared with acceptability limit value in the logical program, if there is a phase signals defective, then single-chip microcomputer is given described relay by signal of I/O port output; The normally closed node of described relay inserts the separating brake actuator of described circuit breaker.
The present invention can also adopt following technical scheme:
Described single-chip microcomputer every phase signals is measured and with logical program in the acceptability limit value compare after, if having one mutually defectively, then single-chip microcomputer can be given described relay by signal of I/O port output; The normally closed node of described relay inserts the separating brake actuator of described circuit breaker; Breaker open operation success back single-chip microcomputer is given signal of Light-Emitting Diode, if the unsuccessful single-chip microcomputer of breaker open operation is given signal of buzzer.
The technical scheme that the present invention takes for the control method of low-voltage circuit breaker electronic undervoltage, over-pressure safety device for the technical problem that exists in the solution known technology is:
Wherein the controlled step of single-chip microcomputer is as follows:
(1) system initialization;
(2) microprocessor is read circuit breaker auxiliary node state;
(3) judge whether circuit breaker closes a floodgate,, then return step (2) if do not close a floodgate;
(4) if circuit breaker closes a floodgate, then begin to sample, gather three-phase voltage signal;
(5) signal that collects is protected calculating;
(6) data that draw after the calculating and the qualified data of setting compare, and judge that whether each exists fault mutually, if there is not fault, then returns step (5);
(7) if exist fault then to drive circuit breaker actuator;
(8) behind the driving mechanism, drive the relay node simultaneously;
(9) read circuit breaker auxiliary node state again after the node output;
(10) judge whether action is successful, if success then drives the lamp flicker;
(11) if the not successful then sound and light alarm of action.
Advantage and good effect that the present invention has are: owing to be to be the intelligence controlling device of core with the microprocessor, having added the control flow step of microprocessor, just can improve the precision of its sampling like this, guarantee the reliability of low-voltage circuit breaker action.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is the control program flow chart of single-chip microcomputer among the present invention.
Embodiment
For further understanding content of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
As shown in Figure 1, the A of low-voltage circuit breaker major loop, B, C threephase potential transformer are input to voltage signal each input port of precision operational-amplifier; Signal after precision operational-amplifier will be handled is input to the I/O port of single-chip microcomputer through electronic strobe switch; Single-chip microcomputer every phase signals is measured and with logical program in the acceptability limit value compare after, if having one mutually defectively, then single-chip microcomputer can be given relay by signal of I/O port output; The normally closed node of relay inserts the separating brake actuator of circuit breaker; Breaker open operation success back single-chip microcomputer is given signal of Light-Emitting Diode, allows its flicker; If the unsuccessful single-chip microcomputer of breaker open operation is given signal of buzzer, allow its pronunciation report to the police.
As shown in Figure 2, the control program flow process of single-chip microcomputer is:
(1) system initialization;
(2) microprocessor is read circuit breaker auxiliary node state;
(3) judge whether circuit breaker closes a floodgate,, then return step (2) if do not close a floodgate;
(4) if circuit breaker closes a floodgate, then begin to sample, gather three-phase voltage signal;
(5) signal that collects is protected calculating;
(6) data that draw after the calculating and the qualified data of setting compare, and judge that whether each exists fault mutually, if there is not fault, then returns step (5);
(7) if exist fault then to drive circuit breaker actuator;
(8) behind the driving mechanism, drive the relay node simultaneously;
(9) read circuit breaker auxiliary node state again after the node output;
(10) judge whether action is successful, if success then drives the lamp flicker;
(11) if the not successful then sound and light alarm of action.
Claims (3)
1. a low-voltage circuit breaker electronic undervoltage, over-pressure safety device, it includes the actuator of voltage transformer, precision operational-amplifier, electronic strobe switch, single-chip microcomputer, relay and the automatic change-over of gathering circuit breaker end of incoming cables A, B, C, each phase of N; Described A, B, C threephase potential transformer are input to voltage signal each input port of described precision operational-amplifier; Signal after precision operational-amplifier will be handled is input to the I/O port of described single-chip microcomputer through electronic strobe switch; Described single-chip microcomputer is every phase signals being measured and being compared with acceptability limit value in the logical program, if there is a phase signals defective, then single-chip microcomputer is given described relay by signal of I/O port output; The normally closed node of described relay inserts the separating brake actuator of described circuit breaker.
2. low-voltage circuit breaker electronic undervoltage according to claim 1, over-pressure safety device, it is characterized in that: described single-chip microcomputer every phase signals is measured and with logical program in the acceptability limit value compare after, if have one mutually defectively, then single-chip microcomputer can be given described relay by signal of I/O port output; The normally closed node of described relay inserts the separating brake actuator of described circuit breaker; Breaker open operation success back single-chip microcomputer is given signal of Light-Emitting Diode, if the unsuccessful single-chip microcomputer of breaker open operation is given signal of buzzer.
3. the control method of a low-voltage circuit breaker electronic undervoltage, over-pressure safety device, wherein the controlled step of single-chip microcomputer is as follows:
(1) system initialization;
(2) microprocessor is read circuit breaker auxiliary node state;
(3) judge whether circuit breaker closes a floodgate,, then return step (2) if do not close a floodgate;
(4) if circuit breaker closes a floodgate, then begin to sample, gather three-phase voltage signal;
(5) signal that collects is protected calculating;
(6) data that draw after the calculating and the qualified data of setting compare, and judge that whether each exists fault mutually, if there is not fault, then returns step (5);
(7) if exist fault then to drive circuit breaker actuator;
(8) behind the driving mechanism, drive the relay node simultaneously;
(9) read circuit breaker auxiliary node state again after the node output;
(10) judge whether action is successful, if success then drives the lamp flicker;
(11) if the not successful then sound and light alarm of action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101536025A CN101414743A (en) | 2008-11-28 | 2008-11-28 | Electronic less/over-voltage protective device for low-voltage circuit breaker and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101536025A CN101414743A (en) | 2008-11-28 | 2008-11-28 | Electronic less/over-voltage protective device for low-voltage circuit breaker and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101414743A true CN101414743A (en) | 2009-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101536025A Pending CN101414743A (en) | 2008-11-28 | 2008-11-28 | Electronic less/over-voltage protective device for low-voltage circuit breaker and control method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394492A (en) * | 2011-09-29 | 2012-03-28 | 安徽鑫龙电器股份有限公司 | Circuit breaker closing protection device and closing protection method |
| CN102709875A (en) * | 2012-05-30 | 2012-10-03 | 江苏国星电器有限公司 | Under-voltage and over-voltage two-way release |
| CN102738764A (en) * | 2012-07-06 | 2012-10-17 | 浙江正泰电器股份有限公司 | Electronic controller for breaker |
| CN103036195A (en) * | 2011-10-10 | 2013-04-10 | 松下电器研究开发(苏州)有限公司 | Protective circuit of air-conditioner circuits and control method thereof |
| CN105448609A (en) * | 2015-11-19 | 2016-03-30 | 广东电网有限责任公司珠海供电局 | Voltage trip device |
| CN107102184A (en) * | 2017-06-13 | 2017-08-29 | 湖南中车时代通信信号有限公司 | A kind of accident indicator |
| CN107994549A (en) * | 2017-12-20 | 2018-05-04 | 国网江西省电力有限公司电力科学研究院 | The definite method of distribution line low-voltage circuit breaker low-voltage protection delay time |
-
2008
- 2008-11-28 CN CNA2008101536025A patent/CN101414743A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394492A (en) * | 2011-09-29 | 2012-03-28 | 安徽鑫龙电器股份有限公司 | Circuit breaker closing protection device and closing protection method |
| CN103036195A (en) * | 2011-10-10 | 2013-04-10 | 松下电器研究开发(苏州)有限公司 | Protective circuit of air-conditioner circuits and control method thereof |
| CN102709875A (en) * | 2012-05-30 | 2012-10-03 | 江苏国星电器有限公司 | Under-voltage and over-voltage two-way release |
| CN102709875B (en) * | 2012-05-30 | 2014-11-05 | 江苏国星电器有限公司 | Under-voltage and over-voltage two-way release |
| CN102738764A (en) * | 2012-07-06 | 2012-10-17 | 浙江正泰电器股份有限公司 | Electronic controller for breaker |
| CN102738764B (en) * | 2012-07-06 | 2014-12-17 | 浙江正泰电器股份有限公司 | Electronic controller for breaker |
| CN105448609A (en) * | 2015-11-19 | 2016-03-30 | 广东电网有限责任公司珠海供电局 | Voltage trip device |
| CN107102184A (en) * | 2017-06-13 | 2017-08-29 | 湖南中车时代通信信号有限公司 | A kind of accident indicator |
| CN107994549A (en) * | 2017-12-20 | 2018-05-04 | 国网江西省电力有限公司电力科学研究院 | The definite method of distribution line low-voltage circuit breaker low-voltage protection delay time |
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Open date: 20090422 |