CN201063055Y - Circuit for monitoring three-phase four-wire power failure - Google Patents
Circuit for monitoring three-phase four-wire power failure Download PDFInfo
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- CN201063055Y CN201063055Y CNU2007200970925U CN200720097092U CN201063055Y CN 201063055 Y CN201063055 Y CN 201063055Y CN U2007200970925 U CNU2007200970925 U CN U2007200970925U CN 200720097092 U CN200720097092 U CN 200720097092U CN 201063055 Y CN201063055 Y CN 201063055Y
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Abstract
The utility model relates to a power fault detecting circuit, in particular to a three-phase four-wire system power fault detecting circuit that is used for a dual power automatic transfer switch. The power fault detecting circuit comprises a three-phase four-wire system unbalanced voltage and phase failure detecting circuit, a power failure detecting circuit and a single-chip microcomputer; the three-phase four-wire system unbalanced voltage and phase failure detecting circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1 and a bidirectional photo coupler D1; the power failure detecting circuit comprises a transformer T1, a rectifying bridge D2, a resistor R6, a resistor R7 and a capacitor C2. No matter how the three-phase power is loaded (resistance, capacitance and inductance) or wired, the detecting circuit can give off an alarm for unbalanced voltage, phase failure and power failure of the power, thereby ensuring accurate and reliable fault detecting and judging.
Description
Technical field
The utility model relates to a kind of power fail observation circuit, particularly relates to a kind of three-phase four-wire system power fail observation circuit that is used for double power supply automatic transfer switch.
Technical background
At present, the application of double power supply automatic transfer switch is very extensive, because in course of normal operation, the input electrical network can break down, thus should be accurately and reliably for the monitoring of power fail.But the general problem that exists of existing power fail observation circuit is: when the fault of the three-phase supply phase failure, imbalance of three-phase voltage or three-phase supply dead electricity occurring, its fault can not be monitored and judge to observation circuit exactly, and therefore, reliability is relatively poor.
Summary of the invention
In view of the problem that above-mentioned prior art exists, the utility model provides a kind of three-phase four-wire system power fail observation circuit that is used for double power supply automatic transfer switch.No matter this circuit three-phase supply band any load (resistive, capacitive, perception) and any wiring mode of load, observation circuit all can be realized power source voltage imbalance, the phase failure and dead electricity malfunction are reported to the police effectively, guarantees monitoring and judges that its fault accurately, reliably.
The technical scheme that the utility model is taked is: a kind of three-phase four-wire system power fail observation circuit, it is characterized in that, comprise three-phase four-wire system Voltage unbalance and phase failure observation circuit, dead electricity observation circuit and single-chip microcomputer, described imbalance of three-phase voltage and phase failure observation circuit comprise resistance R 1, R2, R3, R4, R5, capacitor C 1 and bi-directional light electric coupler D1; Described dead electricity observation circuit comprises transformer T1, rectifier bridge D2, resistance R 6, R7 and capacitor C 2.
The beneficial effects of the utility model are: take technique scheme, the utlity model has simple, the with low cost and monitoring of circuit and judge characteristics such as power fail reliability height.
Description of drawings
Fig. 1 is an electrical schematic diagram of the present utility model and as Figure of abstract.
Embodiment
Below describe principle of work in detail: under the three-phase supply normal operating conditions, 120 ° of three-phase alternating current L1-N, L2-N, L3-N alternating voltage 220V phase differential, UP terminal voltage phasor and be zero, the photosensitive emission diode input terminal voltage of photoelectrical coupler is 0V, the electric current that flows through bi-directional light electric coupler D1 emitter is very little, produce DC voltage VD1 through resistance R 5, capacitor C 1, after single-chip microcomputer is changed through AD1, if the magnitude of voltage of VD1 end is less than the unbalance voltage value of setting, power supply does not have the phase failure or imbalance fault to report to the police.L1-N in the three-phase alternating current phase line is through transformer T1 output AC voltage simultaneously, output to Chip Microcomputer A 2 through rectifier bridge D2 rectifying and wave-filtering and resistance R 6, R7 dividing potential drop, voltage is higher than fault undervoltage warning value, because AD1, AD2 value be all in normal range, and single-chip microcomputer output three-phase supply normal signal.
If three-phase supply dead electricity, though it is normal to output to Chip Microcomputer A 1 magnitude of voltage, but AD2 is lower than fault undervoltage warning value, at this moment single-chip microcomputer output alarm signal, if imbalance of three-phase voltage, then the photosensitive emitting diode input end of bi-directional light electric coupler D1 has alternating voltage, through phototriode signal is amplified to produce VD1 voltage, AD through single-chip microcomputer changes as if the AD value greater than setting alarming value, then single-chip microcomputer output alarm signal.
With reference to accompanying drawing, describe the utility model in detail.
The utility model comprises three-phase four-wire system Voltage unbalance and phase failure observation circuit, dead electricity observation circuit and single-chip microcomputer, imbalance of three-phase voltage and phase failure observation circuit comprise resistance R 1, R2, R3, R4, R5, capacitor C 1 and bi-directional light electric coupler D1, wherein, resistance R 1, R2, the end of R3 connects three respectively and exchanges phase line L1, L2, L3, resistance R 1, R2, the other end of R3 is connected in parallel and connects an end of two photosensitive emitting diodes among the bi-directional light electric coupler D1 and an end of resistance R 4 respectively, the other end of two photosensitive emitting diodes among the bi-directional light electric coupler D1 is the other end and the three-phase supply N end of connection electrical resistance R4 respectively, collector among the bi-directional light electric coupler D1 connects+the 5V power supply, emitter connects resistance R 5 and an end of capacitor C 1 and the input end AD1 of single-chip microcomputer, and the other end of resistance R 5 and capacitor C 1 connects back ground connection; Described dead electricity observation circuit comprises transformer T1, rectifier bridge D2, resistance R 6, R7 and capacitor C 2, wherein, exchange the elementary of phase line L1 and N line difference tietransformer T1, the input end of the secondary connection rectifier bridge D2 of transformer T1, the end of the output terminal connecting resistance R6 of rectifier bridge D2, the input end AD2 of the other end connection electrical resistance R7 of resistance R 6 and an end of capacitor C 2 and single-chip microcomputer, another output terminal of resistance R 7, capacitor C 2 and rectifier bridge D2 connects back ground connection.
The utility model single-chip microcomputer can adopt any one in PIC16F877 and the PIC16F72 model.
Claims (2)
1. three-phase four-wire system power fail observation circuit, it is characterized in that, comprise three-phase four-wire system Voltage unbalance and phase failure observation circuit, dead electricity observation circuit and single-chip microcomputer, described imbalance of three-phase voltage and phase failure observation circuit comprise resistance (R1), (R2), (R3), (R4), (R5), electric capacity (C1) and bi-directional light electric coupler (D1), wherein, resistance (R1), (R2), (R3) a end connects three respectively and exchanges phase line (L1), (L2), (L3), resistance (R1), (R2), (R3) the other end the be connected in parallel end that connects two photosensitive emitting diodes in the bi-directional light electric coupler (D1) respectively and an end of resistance (R4), the other end of two photosensitive emitting diodes in the bi-directional light electric coupler (D1) is the other end and three-phase supply (N) end of connection electrical resistance (R4) respectively, collector in the bi-directional light electric coupler (D1) connects+the 5V power supply, the input end (AD1) of one end of emitter connection electrical resistance (R5) and electric capacity (C1) and single-chip microcomputer, the other end of resistance (R5) and electric capacity (C1) connect back ground connection; Described dead electricity observation circuit comprises transformer (T1), rectifier bridge (D2), resistance (R6), (R7) and electric capacity (C2), wherein, exchange the elementary of phase line (L1) and N line difference tietransformer (T1), the input end of the secondary connection rectifier bridge (D2) of transformer (T1), one end of the output terminal connecting resistance (R6) of rectifier bridge (D2), the input end (AD2) of the other end connection electrical resistance (R7) of resistance (R6) and an end of electric capacity (C2) and single-chip microcomputer, another output terminal of resistance (R7), electric capacity (C2) and rectifier bridge (D2) connects back ground connection.
2. three-phase four-wire system power fail observation circuit as claimed in claim 1 is characterized in that described single-chip microcomputer can adopt any one in PIC16F877 and the PIC16F72 model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200970925U CN201063055Y (en) | 2007-08-16 | 2007-08-16 | Circuit for monitoring three-phase four-wire power failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200970925U CN201063055Y (en) | 2007-08-16 | 2007-08-16 | Circuit for monitoring three-phase four-wire power failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201063055Y true CN201063055Y (en) | 2008-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200970925U Expired - Fee Related CN201063055Y (en) | 2007-08-16 | 2007-08-16 | Circuit for monitoring three-phase four-wire power failure |
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| CN (1) | CN201063055Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819261A (en) * | 2009-08-28 | 2010-09-01 | 深圳威迈斯电源有限公司 | Three-phase source phase failure and power failure detection circuit |
| CN102684296A (en) * | 2012-05-14 | 2012-09-19 | 常熟开关制造有限公司(原常熟开关厂） | Fault detection circuit of automatic transfer switch |
| CN105203911A (en) * | 2015-10-26 | 2015-12-30 | 常熟开关制造有限公司(原常熟开关厂） | Open conductor fault detection method and device for three-phase power source and automatic transfer switch |
| CN105353261A (en) * | 2015-10-26 | 2016-02-24 | 常熟开关制造有限公司(原常熟开关厂） | Open-phase fault detection method and device, and automatic change-over switch |
| CN105629183A (en) * | 2014-11-07 | 2016-06-01 | 德律科技股份有限公司 | Three-phase power supply detection device, system and method |
| CN106532633A (en) * | 2016-12-20 | 2017-03-22 | 中国航空工业集团公司雷华电子技术研究所 | Three-phase four-wire system isolation open-phase protection circuit |
| CN109085514A (en) * | 2018-08-16 | 2018-12-25 | 北京泰恒众信科技有限公司 | Break period test method and tester |
| CN110286336A (en) * | 2019-07-04 | 2019-09-27 | 北京市速连科通信设备有限责任公司 | A kind of power detector |
-
2007
- 2007-08-16 CN CNU2007200970925U patent/CN201063055Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819261A (en) * | 2009-08-28 | 2010-09-01 | 深圳威迈斯电源有限公司 | Three-phase source phase failure and power failure detection circuit |
| CN101819261B (en) * | 2009-08-28 | 2013-02-20 | 深圳威迈斯电源有限公司 | Three-phase source phase failure and power failure detection circuit |
| CN102684296A (en) * | 2012-05-14 | 2012-09-19 | 常熟开关制造有限公司(原常熟开关厂） | Fault detection circuit of automatic transfer switch |
| CN105629183A (en) * | 2014-11-07 | 2016-06-01 | 德律科技股份有限公司 | Three-phase power supply detection device, system and method |
| CN105629183B (en) * | 2014-11-07 | 2018-08-31 | 德律科技股份有限公司 | Three-phase source detecting device, system and method |
| CN105203911A (en) * | 2015-10-26 | 2015-12-30 | 常熟开关制造有限公司(原常熟开关厂） | Open conductor fault detection method and device for three-phase power source and automatic transfer switch |
| CN105353261A (en) * | 2015-10-26 | 2016-02-24 | 常熟开关制造有限公司(原常熟开关厂） | Open-phase fault detection method and device, and automatic change-over switch |
| CN105203911B (en) * | 2015-10-26 | 2018-01-05 | 常熟开关制造有限公司(原常熟开关厂） | Three phase mains open phase fault detection method, device and a kind of automatic change-over |
| CN105353261B (en) * | 2015-10-26 | 2018-01-19 | 常熟开关制造有限公司(原常熟开关厂） | Open phase fault detection method, device and a kind of automatic change-over |
| CN106532633A (en) * | 2016-12-20 | 2017-03-22 | 中国航空工业集团公司雷华电子技术研究所 | Three-phase four-wire system isolation open-phase protection circuit |
| CN109085514A (en) * | 2018-08-16 | 2018-12-25 | 北京泰恒众信科技有限公司 | Break period test method and tester |
| CN110286336A (en) * | 2019-07-04 | 2019-09-27 | 北京市速连科通信设备有限责任公司 | A kind of power detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080521 Termination date: 20140816 |
|
| EXPY | Termination of patent right or utility model |