CN204464947U - A kind of signal sampling device be applied on phase-defect protection circuit breaker off zero - Google Patents
A kind of signal sampling device be applied on phase-defect protection circuit breaker off zero Download PDFInfo
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- CN204464947U CN204464947U CN201520088809.4U CN201520088809U CN204464947U CN 204464947 U CN204464947 U CN 204464947U CN 201520088809 U CN201520088809 U CN 201520088809U CN 204464947 U CN204464947 U CN 204464947U
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Abstract
The utility model discloses a kind of signal sampling device be applied on phase-defect protection circuit breaker off zero; be in series with rectifier diode, voltage divider and current rectifying and wave filtering circuit respectively between A, B, C three-phase wire and zero line, between voltage divider and current rectifying and wave filtering circuit, be connected with single-chip microcomputer.The utility model adopts voltage divider to extract circuit phase voltage signal, after rectifying and wave-filtering, become in direct current signal input single-chip microcomputer and compare analysis, because voltage signal sampling does not pass through other too many parts, not only element is few, volume is little, be applicable to circuit breaker narrow space, and be quick on the draw, judging efficiency is high, reliability is strong.
Description
Technical field
The utility model relates to a kind of circuit breaker accessory, is specifically related to a kind of signal sampling device be applied on phase-defect protection circuit breaker 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.
For solving the problems of the technologies described above; the applicant invents a kind of circuit breaker with default-phase protection function off zero; this circuit breaker not only needs to detect residual current; also need to detect signal off zero, also do not have the signal supervisory instrument off zero that can be applied on circuit breaker at present on the market.
Summary of the invention
In order to overcome the deficiencies in the prior art, the utility model provides a kind of signal sampling device be applied on phase-defect protection circuit breaker off zero.
The utility model solves the technical scheme that its technical problem adopts:
Be applied to the signal sampling device on phase-defect protection circuit breaker off zero, be in series with rectifier diode, voltage divider and current rectifying and wave filtering circuit respectively between A, B, C three-phase wire and zero line, between voltage divider and current rectifying and wave filtering circuit, be connected with single-chip microcomputer.
In the utility model, described single-chip microcomputer is also connected with residual current sample circuit.
The beneficial effects of the utility model are: the utility model adopts voltage divider to extract circuit phase voltage signal, after rectifying and wave-filtering, become in direct current signal input single-chip microcomputer and compare analysis, because voltage signal sampling does not pass through other too many parts, not only element is few, volume is little, be applicable to circuit breaker narrow space, and be quick on the draw, judging efficiency is high, reliability is strong.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the utility model is further illustrated:
Fig. 1 is the structural representation of the present embodiment.
Embodiment
With reference to Fig. 1; the utility model provides a kind of signal sampling device be applied on phase-defect protection circuit breaker off zero; be in series with rectifier diode 1, voltage divider 2 and current rectifying and wave filtering circuit 3 between A, B, C three-phase wire and zero line respectively, between voltage divider 2 and current rectifying and wave filtering circuit 3, be connected with single-chip microcomputer 4.
As preferred embodiment, described single-chip microcomputer 4 is also connected with residual current sample circuit 5, described residual current sample circuit 5 inputs single-chip microcomputer 4 after being sampled to residual current by residual current transformer, sends the pulse signal of whether open circuit after single-chip microcomputer 4 and set point compare computing.
The foregoing is only preferred embodiments of the present utility model, as long as the technical scheme realizing the utility model object with basic same approach all belongs within protection range of the present utility model.
Claims (2)
1. one kind is applied to the signal sampling device on phase-defect protection circuit breaker off zero; it is characterized in that: be in series with rectifier diode (1), voltage divider (2) and current rectifying and wave filtering circuit (3) between A, B, C three-phase wire and zero line respectively, between voltage divider (2) and current rectifying and wave filtering circuit (3), be connected with single-chip microcomputer (4).
2. a kind of signal sampling device be applied on phase-defect protection circuit breaker off zero according to claim 1, is characterized in that: described single-chip microcomputer (4) is also connected with residual current sample circuit (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520088809.4U CN204464947U (en) | 2015-02-06 | 2015-02-06 | A kind of signal sampling device be applied on phase-defect protection circuit breaker off zero |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520088809.4U CN204464947U (en) | 2015-02-06 | 2015-02-06 | A kind of signal sampling device be applied on phase-defect protection circuit breaker off zero |
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| Publication Number | Publication Date |
|---|---|
| CN204464947U true CN204464947U (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520088809.4U Active CN204464947U (en) | 2015-02-06 | 2015-02-06 | A kind of signal sampling device be applied on phase-defect protection circuit breaker off zero |
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| CN (1) | CN204464947U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356811A (en) * | 2016-10-27 | 2017-01-25 | 国网冀北电力有限公司张家口供电公司 | Circuit breaker with faulted neutral line and default phase protection function |
-
2015
- 2015-02-06 CN CN201520088809.4U patent/CN204464947U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356811A (en) * | 2016-10-27 | 2017-01-25 | 国网冀北电力有限公司张家口供电公司 | Circuit breaker with faulted neutral line and default phase protection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |