CN104659739A - Circuit breaker with neutral line fault default phase protection function - Google Patents
Circuit breaker with neutral line fault default phase protection function Download PDFInfo
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- CN104659739A CN104659739A CN201510064022.9A CN201510064022A CN104659739A CN 104659739 A CN104659739 A CN 104659739A CN 201510064022 A CN201510064022 A CN 201510064022A CN 104659739 A CN104659739 A CN 104659739A
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Abstract
The invention discloses a circuit breaker with a neutral line fault default phase protection function. The circuit breaker comprises a circuit breaker main body, a voltage signal module, a comparing and analyzing module, a working power supply module, a trip coil module and a pulse triggering module, wherein the voltage signal module is mounted on the circuit breaker main body and is used for testing whether a neutral line is broken or not; the comparing and analyzing module is used for analyzing a voltage signal; the working power supply module is used for supplying power to the comparing and analyzing module; the trip coil module is used for tripping the circuit breaker; the pulse triggering module is used for triggering the trip coil module; the pulse triggering module comprises a first thyristor and a second thyristor which are serially connected onto a phase line circuit in sequence; control electrodes of the first thyristor and the second thyristor are both connected with the comparing and analyzing module; the first thyristor and the second thyristor are connected with the neutral line. When the neutral line fault happens, magnetic force can be generated from the trip coil of the circuit breaker to trigger a trip mechanism, then the circuit breaker is tripped, and the neutral line fault protection function is achieved; when the default phase phenomenon happens, the trip coil, the first thyristor and the neutral line form a loop, and the purpose of default phase protection is achieved.
Description
Technical field
The present invention relates to a kind of circuit breaker, be specifically related to a kind of circuit breaker with default-phase protection function off zero.
Background technology
At low voltage three-phase multiple-way system (TN-C three-phase and four-line A, B, C, PEN; TN-S(TN-C-S) Three-phase five-wire A, B, C, N, PE) in distribution system, A, B, C are phase (fire) line, and N line is working zero line (neutral line); in ground protection system, " zero ground " line separately.No matter be in TN-C or TN-S wiring system, PE line is all under any circumstance never allow to disconnect.N line is then had ready conditions and can be disconnected, namely N line all must disconnect with A, B, C phase line (stricti jurise being said N line could must disconnect after A, B, C phase line disconnects), otherwise occur causing the unfortunate event of people and equipment, therefore, allowing N line to disconnect obviously can only be just passable in TN-S wiring.But the N line that is in operation can not disconnect, disconnect i.e. generation " off zero " fault as there is N line.
The reason that N line disconnects is:
1, threephase load is seriously uneven, and N line current is excessive, and the N line that accumulates over a long period blows;
If 2 N tape contacts, contact is bad even disconnects (not contacting);
3, Natural Damage or artificial theft N line.
For a long time, the N line that is in operation disconnects i.e. " off zero " fault and happens occasionally, under there is single-phase load situation, threephase load scarcely balances, and causes neutral displacement, when there is fault off zero, initiation phase voltage is raised suddenly, overflow phasing voltage more than 1.3 times, single-phase device damage, threephase motor certainly will be caused so normally to run, and What is more also may cause casualties.Even to this day, error protection off zero does not find effective means, therefore, researches and develops the meaning that protective circuit breaker off zero has great reality and technological break-through.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of circuit breaker with default-phase protection function off zero.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of circuit breaker with default-phase protection function off zero, comprise breaker body and be arranged on the voltage signal module whether the measurement zero line in breaker body disconnect, the comparative analysis module of analytical voltage signal, to the working power module of comparative analysis module for power supply, the tripping coil module of breaker open operation can be made and trigger the pulse-triggered module of tripping coil module, described pulse-triggered module comprises the first thyristor be connected on successively on phase alignment circuit, second thyristor, the control of described first thyristor and the second thyristor extremely all with comparative analysis model calling, be connected with zero line between described first thyristor and the second thyristor.
In the present invention, described comparative analysis module is single-chip microcomputer.
In the present invention, described voltage signal module comprises and is connected on voltage divider between A, B, C three-phase wire and zero line and current rectifying and wave filtering circuit respectively, is connected comparative analysis module between voltage divider with current rectifying and wave filtering circuit.
In the present invention, described working power module comprises the rectified three-phase circuit be connected with phase electric wire, the junction field effect transistor connecting rectified three-phase circuit, connects the Voltage stabilizing module of junction field effect transistor, the output of described Voltage stabilizing module and comparative analysis model calling.
In the present invention, described comparative analysis module is also connected with residual current sample circuit.
The invention has the beneficial effects as follows: when there is fault off zero, through the overvoltage signal input comparative analysis module of rectification, filtering process, carry out operational analysis with set point to compare, after confirmation exceedes set point, namely send signal to pulse-triggered module, cause turn on thyristors, circuit breaker tripping coil generating electromagnetic power touches tripping mechanism, cause breaker open operation, thus realize defencive function off zero; 2, when any phase of A, B, C or any two-phase lack simultaneously, trip coil, the first thyristor and zero line form loop, reach the object of open-phase protection; 3, the situation of residual current can be collected by residual current sample circuit; compare with set point operational analysis through comparative analysis module again; after confirmation exceedes set point; namely signal is sent to pulse-triggered module; cause turn on thyristors; circuit breaker tripping coil generating electromagnetic power touches tripping mechanism, causes breaker open operation, thus realizes residual current protecting function.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the present invention is further described:
Fig. 1 is the structural representation of the present embodiment;
Fig. 2 is the circuit theory diagrams of the present embodiment.
Embodiment
With reference to Fig. 1, Fig. 2, the invention provides a kind of circuit breaker with default-phase protection function off zero, comprise breaker body and be arranged on the voltage signal module 1 whether the measurement zero line in breaker body disconnect, the comparative analysis module 2 of analytical voltage signal, to the working power module 3 that comparative analysis module 2 is powered, the tripping coil module 4 of breaker open operation can be made and trigger the pulse-triggered module 5 of tripping coil module 4, described tripping coil module 4 comprises tripping coil and breaker tripping mechanism, described pulse-triggered module 5 comprises the first thyristor 53 be connected on successively on phase alignment circuit, second thyristor 54, described first thyristor 53 is extremely all connected with comparative analysis module 2 with the control of the second thyristor 54, be connected with zero line between described first thyristor 53 and the second thyristor 54, above-mentioned modules is installed in the housing of circuit breaker.Further, described first thyristor 53 is parallel with grading resistor I, described second thyristor 54 is parallel with grading resistor II.Make the voltage at two thyristor two ends keep balance by two grading resistors, reduce the generation of failure rate.For reducing interference, between described first thyristor 53 and comparative analysis module 2, be provided with optical coupling isolator I and filter capacitor I.Optical coupling isolator II and filter capacitor II is provided with between described second thyristor 54 and comparative analysis module 2.
In the present embodiment, described comparative analysis module 2 is one 8 single-chip microcomputers, described single-chip microcomputer is connected with working power module 3, described working power module 3 comprises the rectified three-phase circuit 31 be connected with phase electric wire, the junction field effect transistor 32 connecting rectified three-phase circuit 31, the Voltage stabilizing module 33 that connects junction field effect transistor 32, and the output of described Voltage stabilizing module 33 is connected with comparative analysis module 2.Working power module 3 takes from ac phase voltage, after rectified three-phase circuit 31, junction field effect transistor 32 and Voltage stabilizing module 33, become DC5V voltage supply single-chip microcomputer make working power, its antijamming capability is strong, even if there is the phenomenons such as phase shortage off zero in three-phase circuit, also can not affect the reliability of single-chip microcomputer work, the timely open circuit of circuit breaker can be made.Further; endangering whole power module for exempting overvoltage pulse, being provided with piezo-resistance 35 between phase electric wire and zero line, and being parallel with filter capacitor 36 at the outlet side of described junction field effect transistor 32; arranged by this redundancy protecting, add the reliability of power supply and single-chip microcomputer work.
Further, described voltage signal module 1 comprises and is connected on voltage divider 11 between A, B, C three-phase wire and zero line and current rectifying and wave filtering circuit 12 respectively, is connected comparative analysis module 2 between voltage divider 11 with current rectifying and wave filtering circuit 12.When there is fault off zero, the overvoltage signal through rectification, filtering process will change and input in comparative analysis module 2.
As preferred embodiment, described comparative analysis module 2 is also connected with residual current sample circuit 6.Increase residual current transformer to sample to residual current; single-chip microcomputer is inputted after rectification, filtering process; compare with set point operational analysis through comparative analysis module again; after confirmation exceedes set point; namely send signal to pulse-triggered module 5, cause turn on thyristors, circuit breaker tripping coil generating electromagnetic power touches tripping mechanism; cause breaker open operation, thus realize residual current protecting function.Also can increase test winding and loop test button, to verify the validity of residual current trip at residual current transformer secondary side.
The foregoing is only preferred embodiments of the present invention, as long as the technical scheme realizing the object of the invention with basic same approach all belongs within protection scope of the present invention.
Claims (5)
1. the circuit breaker of a band default-phase protection function off zero, it is characterized in that: comprise breaker body and be arranged on the voltage signal module (1) whether the measurement zero line in breaker body disconnect, the comparative analysis module (2) of analytical voltage signal, to the working power module (3) that comparative analysis module (2) is powered, the tripping coil module (4) of breaker open operation can be made and trigger the pulse-triggered module (5) of tripping coil module (4), described pulse-triggered module (5) comprises the first thyristor (53) be connected on successively on phase alignment circuit, second thyristor (54), described first thyristor (53) is extremely all connected with comparative analysis module (2) with the control of the second thyristor (54), be connected with zero line between described first thyristor (53) and the second thyristor (54).
2. a kind of circuit breaker with default-phase protection function off zero according to claim 1, is characterized in that: described comparative analysis module (2) is single-chip microcomputer.
3. a kind of circuit breaker with default-phase protection function off zero according to claim 1 and 2; it is characterized in that: described voltage signal module (1) comprises and is connected on voltage divider (11) between A, B, C three-phase wire and zero line and current rectifying and wave filtering circuit (12) respectively, is connected comparative analysis module (2) between voltage divider (11) with current rectifying and wave filtering circuit (12).
4. a kind of circuit breaker with default-phase protection function off zero according to claim 1 and 2; it is characterized in that: described working power module (3) comprises the rectified three-phase circuit (31) be connected with phase electric wire, the junction field effect transistor (32) connecting rectified three-phase circuit (31), the Voltage stabilizing module (33) that connects junction field effect transistor (32), and the output of described Voltage stabilizing module (33) is connected with comparative analysis module (2).
5. a kind of circuit breaker with default-phase protection function off zero according to claim 1 and 2, is characterized in that: described comparative analysis module (2) is also connected with residual current sample circuit (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510064022.9A CN104659739A (en) | 2015-02-06 | 2015-02-06 | Circuit breaker with neutral line fault default phase protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510064022.9A CN104659739A (en) | 2015-02-06 | 2015-02-06 | Circuit breaker with neutral line fault default phase protection function |
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| Publication Number | Publication Date |
|---|---|
| CN104659739A true CN104659739A (en) | 2015-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510064022.9A Pending CN104659739A (en) | 2015-02-06 | 2015-02-06 | Circuit breaker with neutral line fault default phase protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109831194A (en) * | 2018-12-28 | 2019-05-31 | 航天信息股份有限公司 | A kind of high-power system solid-state relay starting protection method and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2169236Y (en) * | 1993-09-09 | 1994-06-15 | 刘希治 | Null line off protector |
| CN2636472Y (en) * | 2003-06-27 | 2004-08-25 | 李乾良 | Electron type rated current adjustable protector |
| CN101964516A (en) * | 2010-10-15 | 2011-02-02 | 重庆市电力公司 | Three-phase four-wire system zero-line failure and open-phase intelligent protector |
| JP2014060891A (en) * | 2012-09-19 | 2014-04-03 | Chugoku Electric Power Co Inc:The | Instrument transformer faulty phase detection apparatus |
| CN204464944U (en) * | 2015-02-06 | 2015-07-08 | 广东南冠电气有限公司 | A kind of circuit breaker with default-phase protection function off zero |
-
2015
- 2015-02-06 CN CN201510064022.9A patent/CN104659739A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2169236Y (en) * | 1993-09-09 | 1994-06-15 | 刘希治 | Null line off protector |
| CN2636472Y (en) * | 2003-06-27 | 2004-08-25 | 李乾良 | Electron type rated current adjustable protector |
| CN101964516A (en) * | 2010-10-15 | 2011-02-02 | 重庆市电力公司 | Three-phase four-wire system zero-line failure and open-phase intelligent protector |
| JP2014060891A (en) * | 2012-09-19 | 2014-04-03 | Chugoku Electric Power Co Inc:The | Instrument transformer faulty phase detection apparatus |
| CN204464944U (en) * | 2015-02-06 | 2015-07-08 | 广东南冠电气有限公司 | A kind of circuit breaker with default-phase protection function off zero |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109831194A (en) * | 2018-12-28 | 2019-05-31 | 航天信息股份有限公司 | A kind of high-power system solid-state relay starting protection method and system |
| CN109831194B (en) * | 2018-12-28 | 2023-12-12 | 航天信息股份有限公司 | Method and system for starting protection of solid state relay of high-power system |
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Application publication date: 20150527 |
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