CN102364798A - Under-voltage protection device and protection method for circuit breaker - Google Patents
Under-voltage protection device and protection method for circuit breaker Download PDFInfo
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- CN102364798A CN102364798A CN2011103236883A CN201110323688A CN102364798A CN 102364798 A CN102364798 A CN 102364798A CN 2011103236883 A CN2011103236883 A CN 2011103236883A CN 201110323688 A CN201110323688 A CN 201110323688A CN 102364798 A CN102364798 A CN 102364798A
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Abstract
The invention discloses an under-voltage protection device and an under-voltage protection method for a circuit breaker. The device comprises an electromagnet connected with an under-voltage protection tripping device of the circuit breaker, and is characterized in that: an under-voltage module is arranged in the under-voltage protection device; and the input end of the under-voltage module is connected with a three-phase power supply, and the output end of the under-voltage module is connected with the electromagnet. Compared with the prior art, the structure and the method realize under-voltage protection over the circuit breaker by the electromagnet under the drive of the under-voltage module, and have the advantages that: (1) an under-voltage value is adjustable within the range of 35 to 85 percent and highly accurate, and has the range of 1V; (2) an under-voltage time delay is continuously adjustable within the range of 0 to 10s and highly accurate, and has the range of 0.5s, and when the time delay is set to be 0s, the under-voltage protection tripping device is an instantaneous under-voltage tripping device; (3) the voltage of three phases can be detected and displayed with the display accuracy of +/-5 percent at the same time to realize minimum phase under-voltage protection; and (4) the electromagnet is electrically neutral when the circuit breaker normally works, so the service life of the electromagnet can be effectively prolonged.
Description
Technical field
The present invention relates to the circuit breaker in the electric power system, specifically relate to a kind of circuit breaker under-voltage protection device and guard method thereof.
Technical background
At present; Circuit breaker under-voltage protection function on the market is to adopt the device for under-voltage releasing equipment of electromagnet form to realize under-voltage protection function mostly; Existing device for under-voltage releasing equipment shortcoming is: the three-phase under-voltage protection can only can not be realized simultaneously to individual event or two mutually under-voltage shielding in (1).(2) non-adjustable or adjustment of employing toggle switch or the adjustment of employing potentiometer of under-voltage value, but precision is low, can not realize the numeral setting.(3) burn easily when device for under-voltage releasing equipment is operated in the higher occasion of voltage, influence the normal use of circuit breaker.(4) existing device for under-voltage releasing equipment is that the continuous belts electrician does when circuit breaker is worked, and influences useful life.
Summary of the invention
Technical problem to be solved by this invention is the deficiency to prior art; A kind of circuit breaker under-voltage protection device and guard method thereof are provided, solved the non-adjustable or accuracy of magnitude of voltage that existing device for under-voltage releasing equipment of breaker exists not high with problem such as can not realize that three-phase is protected simultaneously.
For solving the problems of the technologies described above; Technical scheme of the present invention is a kind of circuit breaker under-voltage protection device, comprises the electromagnet that is connected with circuit breaker under-voltage protection release, it is characterized in that; Be provided with under-voltage module in the described under-voltage protection device; The input of described under-voltage module is connected with three phase mains, and its output is connected with described electromagnet
Described under-voltage module; Be used for to gather line voltage; Through the electronic circuit in the under-voltage module and single-chip microcomputer to the voltage of gathering input detect, computing, judgement, when satisfying undervoltage condition, the time signaling DM action that under-voltage module is being set; Make circuit breaker trip, thereby realize the circuit breaker under-voltage protection.
Described under-voltage module comprises electric pressure converter, signal sample circuit, decoder, single-chip microcomputer, power circuit, relay, signal driver; Described power circuit is connected with relay with single-chip microcomputer respectively; Three phase mains is connected with single-chip microcomputer through electric pressure converter, signal sample circuit, decoder, and described single-chip microcomputer is connected with electromagnet through signal driver, relay.
The output of the power supply of described power circuit through relay normally open contact and electromagnet mutually in succession; Signal driver output is connected with relay coil.
Described under-voltage module also is provided with button and push button signalling driver is set, and the described button that is provided with is connected with single-chip microcomputer through the push button signalling driver.
Described under-voltage module also is provided with a digital display screen, is connected with the signal output part of single-chip microcomputer.
Said single-chip microcomputer model is MCS-51.
A kind of guard method of circuit breaker under-voltage protection device is characterized in that, storage control program in the single-chip microcomputer, and described method comprises the following steps;
1) initialization step, CPU initialization after system powers on;
2) the signals collecting step is used for voltage signal acquisition;
3) step display is used for the display voltage value and sets under-voltage value and under-voltage delay time;
4) the button step is set, is used for under-voltage value and under-voltage delay time are set;
5) computing, determining step, through CPU carry out computing, judge whether the phase failure, under-voltage;
6) execution in step whether carries out action command according to computing, judged result;
7) reset process is used for after fault is got rid of system reset being detected once more.
A kind of circuit breaker under-voltage protection device and guard method thereof owing to adopt said structure and method, compared with prior art, realize the circuit breaker under-voltage protection through under-voltage module drive electromagnet, have the following advantages; (1) under-voltage value is adjustable, and extreme difference is 1V, adjustable extent 35%-85%, and precision is high; (2) under-voltage delay time is adjustable continuously, and extreme difference is 0.5s, and adjustable extent 0s-10s precision is high; It when the time is set to 0s the transient voltage release; (3) simultaneously three-phase voltage is detected and show that display precision is ± 5%, realize minimum phase under-voltage protection; (4) electromagnet is not charged during normal operation of circuit breaker, can effectively improve useful life.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation;
Fig. 1 is a kind of circuit breaker under-voltage protection of the present invention device circuit structured flowchart;
Fig. 2 is a circuit breaker under-voltage protection device circuit wiring schematic diagram shown in Figure 1;
Fig. 3 is a kind of guard method main program flow chart of circuit breaker under-voltage protection device;
In Fig. 1 and Fig. 2: 1, three phase mains; 2, electric pressure converter; 3, signal sample circuit; 4, decoder; 5, single-chip microcomputer; 6, button is set; 7, push button signalling driver; 8, power circuit; 9, relay; 10, signal driver; 11, digital display screen; 12, electromagnet; 13, circuit breaker; 14, crystal oscillator; 15, reset circuit.
Embodiment
Like Fig. 1, shown in Figure 2; Fig. 1 is a kind of circuit breaker under-voltage protection device circuit structured flowchart; This under-voltage module is provided with four voltage input ends; Respectively with circuit breaker secondary terminal on three-phase alternating current A, B, C, N link to each other, the Ua of the voltage input signal three phase mains 1 of under-voltage module, Ub, Uc, Un are connected with signal sample circuit 3 through electric pressure converter 2, the output of signal sample circuit 3 is connected through the signal input part of decoder 4 with single-chip microcomputer 5; The signal output of single-chip microcomputer 5 is connected with signal driver 10; Signal driver 10 outputs are connected with relay coil 9, and power circuit 8 outputs are connected with electromagnet 12 coils through relay 9 normally opened contacts, and electromagnet 12 is connected with circuit breaker 13.Also be provided with on the under-voltage module button 6 is set, be connected with single-chip microcomputer 5 through push button signalling driver 7.Also be provided with a digital display screen 11 on the under-voltage module, be connected with the signal output part of single-chip microcomputer 5, single-chip microcomputer 5 is connected with external crystal oscillator 14, reset circuit 15, and single-chip microcomputer is the MCS-51 series monolithic.
Under-voltage module in the circuit breaker under-voltage protection device; Convert input voltage to suitable voltage signal; Import the MCS-51 series monolithic then, realization is relatively judged sampling, processing, the logic of voltage signal and is exported, realizes the separating brake of circuit breaker through electromagnet.And can parameter be set through button 6 inputs that are provided with on the under-voltage module, digital display screen 11 comes display parameters setting and voltage to show.
The under-voltage protection module increases voltage signal sampling, computing judgement and under-voltage protection function on software.Convert line voltage to signal input single-chip microcomputer 5 through an electric pressure converter 2; Then by 5 pairs three phase input signals of single-chip microcomputer detect, computing and judgement; Thereby realize under-voltage value and operate time adjustable function, under-voltage value and operate time are set through button 6 is set.
As shown in Figure 3, step 10 SCM system powers on, step 11CPU initialization, and step 12 is accomplished voltage sample through electric pressure converter and signal sample circuit; Step 13 is carried out numerical value by digital display screen and is shown, mainly shows current voltage and button is set the parameter value when being provided with.Step 14 judges whether the button setting, if get into step 15 user and through button is set under-voltage value and under-voltage delay time are set as required the time; If not; Get into step 16 and judge whether the phase failure, under-voltage through computing, by signal driver driving relay electromagnet is carried out action command if under-voltage value, then gets into step 17 less than set point by CPU; Circuit breaker breaks off, if under-voltage value is during more than or equal to set point then get into step 12 and continue voltage sample.When fix a breakdown or voltage recover normal after, get into step 18 pair SCM system and reset, to continue voltage sample.
Combine accompanying drawing that the present invention has been carried out exemplary description above; Obviously the concrete realization of the present invention does not receive the restriction of aforesaid way; As long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; Or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (7)
1. circuit breaker under-voltage protection device; Comprise the electromagnet (12) that is connected with circuit breaker under-voltage protection release; It is characterized in that, be provided with under-voltage module in the described under-voltage protection device, the input of described under-voltage module is connected with three phase mains (1); Its output is connected with described electromagnet (12)
Described under-voltage module; Be used for to gather line voltage; Through the electronic circuit in the under-voltage module and single-chip microcomputer to the voltage of gathering input detect, computing, judgement, when satisfying undervoltage condition, time signaling DM (12) action that under-voltage module is being set; Make circuit breaker trip, thereby realize the circuit breaker under-voltage protection.
2. circuit breaker under-voltage protection device according to claim 1; It is characterized in that: described under-voltage module comprises electric pressure converter (2), signal sample circuit (3), decoder (4), single-chip microcomputer (5), power circuit (8), relay (9), signal driver (10); Described power circuit (8) is connected with relay (9) with single-chip microcomputer (5) respectively; Three phase mains () is connected with single-chip microcomputer (5) through electric pressure converter (2), signal sample circuit (3), decoder (4), and described single-chip microcomputer (5) is connected with electromagnet (12) through signal driver (10), relay (9).
3. circuit breaker under-voltage protection device according to claim 2 is characterized in that: the output of the power supply of described power circuit (8) through relay (9) normally opened contact and electromagnet (12) mutually in succession; Signal driver (10) output is connected with relay (9) coil.
4. circuit breaker under-voltage protection device according to claim 2; It is characterized in that: described under-voltage module also is provided with button (6) and push button signalling driver (7) is set, and the described button (6) that is provided with is connected with single-chip microcomputer (5) through push button signalling driver (7).
5. circuit breaker under-voltage protection device according to claim 3 is characterized in that: described under-voltage module also is provided with a digital display screen (11), is connected with the signal output part of single-chip microcomputer (5).
6. according to each described circuit breaker under-voltage protection device among the claim 1-5, it is characterized in that said single-chip microcomputer model is MCS-51.
7. the guard method of a circuit breaker under-voltage protection device according to claim 1 is characterized in that, storage control program in the single-chip microcomputer (5), and described method comprises the following steps;
1) initialization step, CPU initialization after system powers on;
2) the signals collecting step is used for voltage signal acquisition;
3) step display is used for the display voltage value and sets under-voltage value and under-voltage delay time;
4) the button step is set, is used for under-voltage value and under-voltage delay time are set;
5) computing, determining step, through CPU carry out computing, judge whether the phase failure, under-voltage;
6) execution in step whether carries out action command according to computing, judged result;
7) reset process is used for after fault is got rid of system reset being detected once more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103236883A CN102364798A (en) | 2011-10-21 | 2011-10-21 | Under-voltage protection device and protection method for circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103236883A CN102364798A (en) | 2011-10-21 | 2011-10-21 | Under-voltage protection device and protection method for circuit breaker |
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| CN102364798A true CN102364798A (en) | 2012-02-29 |
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| CN2011103236883A Pending CN102364798A (en) | 2011-10-21 | 2011-10-21 | Under-voltage protection device and protection method for circuit breaker |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377645A (en) * | 2012-07-02 | 2015-02-25 | 常州工学院 | Low-power-consumption undervoltage tripper |
| CN105449633A (en) * | 2015-11-11 | 2016-03-30 | 绵阳市维博电子有限责任公司 | Over/under voltage protection system of electrical equipment |
| CN105811364A (en) * | 2014-12-31 | 2016-07-27 | 上海良信电器股份有限公司 | Control circuit of circuit breaker under voltage/shunt integration tripping device |
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| JPH06335150A (en) * | 1993-05-18 | 1994-12-02 | Fuji Electric Co Ltd | Circuit device for detecting open-phase of neutral conductor |
| CN1455484A (en) * | 2003-06-09 | 2003-11-12 | 湖南大学 | Intelligent contactless switch |
| CN101039024A (en) * | 2007-01-26 | 2007-09-19 | 上海天健电气有限公司 | Intelligent controller for circuit breakers having full-function under-voltage protection |
| CN201349120Y (en) * | 2008-11-26 | 2009-11-18 | 朱鸽 | Multi-function three-phase power source protector |
-
2011
- 2011-10-21 CN CN2011103236883A patent/CN102364798A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06335150A (en) * | 1993-05-18 | 1994-12-02 | Fuji Electric Co Ltd | Circuit device for detecting open-phase of neutral conductor |
| CN1455484A (en) * | 2003-06-09 | 2003-11-12 | 湖南大学 | Intelligent contactless switch |
| CN101039024A (en) * | 2007-01-26 | 2007-09-19 | 上海天健电气有限公司 | Intelligent controller for circuit breakers having full-function under-voltage protection |
| CN201349120Y (en) * | 2008-11-26 | 2009-11-18 | 朱鸽 | Multi-function three-phase power source protector |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377645A (en) * | 2012-07-02 | 2015-02-25 | 常州工学院 | Low-power-consumption undervoltage tripper |
| CN104377645B (en) * | 2012-07-02 | 2018-08-24 | 常州工学院 | Low-power consumption device for under-voltage releasing equipment |
| CN105811364A (en) * | 2014-12-31 | 2016-07-27 | 上海良信电器股份有限公司 | Control circuit of circuit breaker under voltage/shunt integration tripping device |
| CN105811364B (en) * | 2014-12-31 | 2018-12-07 | 上海良信电器股份有限公司 | The control circuit of breaker Undertension shunt opening integrated electrical apparatus release |
| CN105449633A (en) * | 2015-11-11 | 2016-03-30 | 绵阳市维博电子有限责任公司 | Over/under voltage protection system of electrical equipment |
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Application publication date: 20120229 |