CN200944134Y - Three-phase four-wire power supply fault monitoring circuit - Google Patents
Three-phase four-wire power supply fault monitoring circuit Download PDFInfo
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- CN200944134Y CN200944134Y CN 200620027197 CN200620027197U CN200944134Y CN 200944134 Y CN200944134 Y CN 200944134Y CN 200620027197 CN200620027197 CN 200620027197 CN 200620027197 U CN200620027197 U CN 200620027197U CN 200944134 Y CN200944134 Y CN 200944134Y
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Abstract
The utility model relates to a power failure observation circuit, in particular to a three-phase four-wire type power failure observation circuit for the auto transfer switch with a dual power supply. The utility model is composed of a three-phase four-wire type voltage unbalance and phase failure observation circuit, a blackout observation circuit and a singlechip. The three-phase four-wire type voltage unbalance and phase failure observation circuit consists of a resistor R1, R2, R3, R4 and R5, a capacitance C1 and a two-way photocoupler D1, while the blackout observation circuit consists of a transformer T1, a rectifier bridge D2, a resistor R6, R7 and a capacitance C2. No matter whatever loads (resistance, capacitance and sensitivity)and load wiring methods the three-phase power supply has, the observation circuit can effectively apply an alarm toward the failure status of the power supply such as voltage unbalance, phase failure and blackout and ensure the failure observation and judgment be accurate and reliable.
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 |
|---|---|---|---|
| CN 200620027197 CN200944134Y (en) | 2006-08-31 | 2006-08-31 | Three-phase four-wire power supply fault monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620027197 CN200944134Y (en) | 2006-08-31 | 2006-08-31 | Three-phase four-wire power supply fault monitoring circuit |
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| Publication Number | Publication Date |
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| CN200944134Y true CN200944134Y (en) | 2007-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200620027197 Expired - Fee Related CN200944134Y (en) | 2006-08-31 | 2006-08-31 | Three-phase four-wire power supply fault monitoring circuit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101620258B (en) * | 2009-04-20 | 2011-04-06 | 广东大榕树信息科技有限公司 | Voltage flash-stopping detecting circuit |
| CN102053203A (en) * | 2010-11-04 | 2011-05-11 | 武汉国测恒通智能仪器有限公司 | Detection method and device for high-voltage power quality |
| CN101799520B (en) * | 2010-01-27 | 2011-12-07 | 付爱喜 | Open-phase detection method and detection circuit for three-phase power source |
| CN103364613A (en) * | 2013-07-15 | 2013-10-23 | 长城电器集团有限公司 | Voltage signal conditioning circuit of automatic reclosing lock breaker in time of electric leakage |
| CN106405305A (en) * | 2015-07-30 | 2017-02-15 | 浙江正泰电器股份有限公司 | Zero line open-phase detection circuit and method for detecting open phase of zero line |
| CN106645930A (en) * | 2016-11-23 | 2017-05-10 | 浙江恩鸿电子有限公司 | Three-phase four-wire electric energy metering device having null line missing detection function |
| CN106841896A (en) * | 2016-12-28 | 2017-06-13 | 施耐德万高（天津）电气设备有限公司 | A kind of disconnected phase decision circuitry suitable for automatic transfer switching electric appliance |
| 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 |
| CN113933583A (en) * | 2021-11-08 | 2022-01-14 | 国网天津市电力公司 | Metering secondary voltage loop fault monitoring device |
-
2006
- 2006-08-31 CN CN 200620027197 patent/CN200944134Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101620258B (en) * | 2009-04-20 | 2011-04-06 | 广东大榕树信息科技有限公司 | Voltage flash-stopping detecting circuit |
| CN101799520B (en) * | 2010-01-27 | 2011-12-07 | 付爱喜 | Open-phase detection method and detection circuit for three-phase power source |
| CN102053203A (en) * | 2010-11-04 | 2011-05-11 | 武汉国测恒通智能仪器有限公司 | Detection method and device for high-voltage power quality |
| CN103364613A (en) * | 2013-07-15 | 2013-10-23 | 长城电器集团有限公司 | Voltage signal conditioning circuit of automatic reclosing lock breaker in time of electric leakage |
| CN106405305A (en) * | 2015-07-30 | 2017-02-15 | 浙江正泰电器股份有限公司 | Zero line open-phase detection circuit and method for detecting open phase of zero line |
| CN106405305B (en) * | 2015-07-30 | 2024-02-27 | 浙江正泰电器股份有限公司 | Zero line phase failure detection circuit and method for detecting zero line phase failure |
| CN106645930A (en) * | 2016-11-23 | 2017-05-10 | 浙江恩鸿电子有限公司 | Three-phase four-wire electric energy metering device having null line missing detection function |
| CN106841896A (en) * | 2016-12-28 | 2017-06-13 | 施耐德万高（天津）电气设备有限公司 | A kind of disconnected phase decision circuitry suitable for automatic transfer switching electric appliance |
| 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 |
| CN113933583A (en) * | 2021-11-08 | 2022-01-14 | 国网天津市电力公司 | Metering secondary voltage loop fault monitoring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070905 Termination date: 20110831 |