CN104865454A - Three-phase power supply phase loss detection device - Google Patents
Three-phase power supply phase loss detection device Download PDFInfo
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- CN104865454A CN104865454A CN201410026370.2A CN201410026370A CN104865454A CN 104865454 A CN104865454 A CN 104865454A CN 201410026370 A CN201410026370 A CN 201410026370A CN 104865454 A CN104865454 A CN 104865454A
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Abstract
A three-phase power supply phase loss detection device outputs a detection result via the suction and release states of a relay (J) and adopts a three-phase power supply (L1)-(L3) to rectify and supply power, and a circuit of the power supply forms a detection function of the phase loss faults of an L1 phase and an L3 phase by itself. The detection of an L2 phase adopts a detection circuit based on an optocoupler application technology, and a rectifier diode (D1), a current-limiting resistor (R1) and a filter capacitor (C1) form a half wave rectifying circuit of the three-phase power supply (L2)-(L3). An input light emitting diode of an optocoupler (OC1) is accessed in the half wave rectifying circuit via an input resistor (R2), an output bidirectional silicon controlled rectifier series single-phase rectifier bridge (V1) is accessed in the three-phase power supply (L1)-(L3), and the suction and release control of the relay (J)is realized by controlling the on-off of the output bidirectional silicon controlled rectifier series single-phase rectifier bridge (V1). The detection circuit of the present invention is compact and practical, the number of the circuit components of the detection device is small, and the cost performance is higher.
Description
Technical field
The present invention relates to the safety guard of electric power system, specifically, is a kind of pick-up unit to three-phase supply generation open phase fault.
Background technology
In order to ensure the security of operation of consumer, usually phase interruption testing device is provided with to three-phase supply electric power system.
The patent retrieving open phase detection aspect is more, and its technical scheme mainly comprises following three types:
1. detect the change of the voltage neutral point voltage-to-ground of three-phase supply, when three-phase voltage balances, the neutral point potential of star connection is zero, and when there is open phase fault, neutral point potential significantly displacement, realizes open-phase protection with voltage detecting circuit.Patents has CN 103166188 A phase loss protector for three-phase, a CN 201616655 U open phases of three-phase power source testing circuit etc.
2. detect the voltage waveform of three-phase supply; to each phase power signal sampling; identify whether to there is open-phase fault by wave form analysis circuit; realize power phase shortage protection, Patents has the protecting control method, CN 2831566 Y open phases of three-phase power source protection controller etc. of a CN 102798770 A default phase of frequency converter.
3. gather the phase voltage of three-phase supply respectively; two-phase wherein or three-phase voltage signal are input to AND circuit identification; when three-phase supply is normal, AND circuit exports noble potential; when open-phase fault appears in the phase in three-phase supply or two-phase or three-phase, AND circuit exports electronegative potential; realize power phase shortage protection, Patents has CN 102426302 A three-phase power input phase-loss detection circuit, a CN 101413975 A three-phase power input phase-loss detection circuit etc.
Technique scheme, the component number that testing circuit uses is more, and its testing circuit all have employed DC low-voltage and powers, and needs to obtain from power supply through power supply change-over device, and circuit components is more, and cost is relatively high.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, the three-phase supply phase interruption testing device that a kind of cost performance is higher is provided.
The technical solution adopted for the present invention to solve the technical problems is: three-phase supply phase interruption testing device, comprise three-phase supply input media, detect identification circuit and testing result output circuit, access three-phase supply after connecting by commutation diode (D1), current-limiting resistance (R1) and input (L2), input (L3) with three-phase supply and form half-wave rectifying circuit, filter capacitor (C1) is connected in half-wave rectifying circuit; The input light emitting diode of optocoupler (OC1) accesses half-wave rectifying circuit through input resistance (R2), output bidirectional triode thyristor one end access three-phase supply input (L3) of optocoupler (OC1), the other end connects interchange input (AC2 ~) of single-phase rectification bridge (V1); Interchange input (AC1 ~) access three-phase supply input (L1) of single-phase rectification bridge (V1); The pull-in winding of relay (J) connects the DC output circuit of single-phase rectification bridge (V1).
Access divider resistance (R3) in the DC output circuit of described single-phase rectification bridge (V1), divider resistance (R3) is connected single-phase rectification bridge (V1) respectively direct current after connecting with the pull-in winding of relay (J) exports (DC+) and exports (DC-) with direct current.
Described optocoupler (OC1) selects zero cross fired bidirectional triode thyristor optocoupler.
The present invention compared with prior art, has the following advantages and beneficial effect:
1. testing circuit brief and practical, component number reduces more than 50%, and the trouble spot of circuit and failure rate lower.
2. the components and parts of pick-up unit are few, and assembling is simple with debugging, and production cost significantly reduces.
3. run power consumption lower, power supply total current less than 10mA, power and energy saving.
4. adopt zero cross fired bidirectional triode thyristor to export optocoupler and implement voltage detecting and Control, simple circuit, Electro Magnetic Compatibility is good.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the circuit theory diagrams of the embodiment of the present invention.
Embodiment
In Fig. 1, (L1), (L2), (L3) are three-phase supply input; (J) be miniature relay, disconnected phase information is exported by moving together contact (J-1), break contact (J-2), (J) attracting state represents that three-phase supply is without open phase fault, and (J) release conditions represent that open phase fault appears in a wherein phase in three-phase supply or two-phase or three-phase; (OC1) being optocoupler, is a kind of optocoupler exported as bidirectional triode thyristor, for electric voltage observation circuit and relay drive circuit; (V1) be single-phase rectification bridge, alternating current inputs from (AC1 ~) and (AC2 ~), and direct current is exported by (DC+) and (DC-).
In Fig. 1, the pull-in winding of relay (J) is connected single-phase rectification bridge (V1) respectively direct current after connecting with divider resistance (R3) exports (DC+) and (DC-).Interchange input (AC1 ~) access three-phase supply input (L1) of single-phase rectification bridge (V1); It accesses three-phase supply input (L3) after exchanging the output bidirectional triode thyristor of input (AC2 ~) series winding (OC1).Namely single-phase rectification bridge (V1) circuit itself forms the measuring ability that L1 phase and L3 phase are occurred to for open phase fault, wherein the disappearance of any phase all can make the direct current of single-phase rectification bridge (V1) export (DC+), (DC-) interruption, cause relay (J) to discharge, export disconnected phase information.
Testing circuit based on optocoupler application technology is adopted to the detection of (L2) phase, access three-phase supply after connecting by commutation diode (D1), current-limiting resistance (R1) and input (L2), input (L3) with three-phase supply and form half-wave rectifying circuit, filter capacitor (C1) is connected in half-wave rectifying circuit; The input light emitting diode of optocoupler (OC1) accesses half-wave rectifying circuit through input resistance (R2), output bidirectional triode thyristor-the termination of optocoupler (OC1) enters three-phase supply input (L3), and the other end connects interchange input (AC1 ~) of single-phase rectification bridge (V1); Interchange input (AC2 ~) access three-phase supply input (L1) of single-phase rectification bridge (V1); The direct current connecting single-phase rectification bridge (V1) after pull-in winding series connection divider resistance (R2) of relay (J) respectively exports (DC+) and exports (DC-) with direct current.The discharge capacity of filter capacitor (C1) is designed to drive the output bidirectional triode thyristor of (OC1) to keep conducting 1/40 second to 1/20 second, when (L2)-(L3) voltage is normal, (C1) both end voltage is higher, electric current flows through the input light emitting diode of (OC1) through (R2), thus triggers the output bidirectional triode thyristor conducting of (OC1); When (L2)-(L3) voltage lacks, (C1) both end voltage can reduce rapidly, the input LED current of (OC1) is caused to be ended, output bidirectional triode thyristor blocks, (V1) because without AC input current, direct current exports interruption, relay (J) pull-in winding dead electricity discharges.
The three-phase mains voltage of the present embodiment is AC380V, and the VD of single-phase rectification bridge (V1) is about DC380V.Common small sized pulling relay coil rated voltage is the less of DC380V, G2R-2 Miniature direct current relay selected by relay (J) in figure, the rated voltage DC100V of pull-in winding, rated current 5.3mA, connected the divider resistance R3 of 51K/2W, to adapt to the VD requirement of (V1).
The optocoupler (OC1) of the present embodiment has selected MOC3083, and its output stage is the light-operated bidirectional triode thyristor with zero passage detection, can improve the Electro Magnetic Compatibility of testing circuit.
The important technological parameters of the present embodiment:
Power supply inputs: three-phase AC380V ± 15%
Open phase fault exports: relay contact (1 often open 1 normally closed), contact capacity AC250V10A/DC30V10A
Power consumption :≤4VA
Below launch to describe to invention has been with embodiment by reference to the accompanying drawings, this description does not have restricted, and be also the embodiment that the present invention is formed shown in accompanying drawing, technical scheme of the present invention is not limited thereto.Those of ordinary skill in the art should be understood that, when not departing from design philosophy of the present invention, reality of the present invention implements the change also had in some details.So as long as aim according to the invention, these changes include within protection scope of the present invention.
Claims (3)
1. a three-phase supply phase interruption testing device, comprise three-phase supply input media, detect identification circuit and testing result output circuit, it is characterized in that, access three-phase supply after connecting by commutation diode (D1), current-limiting resistance (R1) and input (L2), input (L3) with three-phase supply and form half-wave rectifying circuit, filter capacitor (C1) is connected in half-wave rectifying circuit; The input light emitting diode of optocoupler (OC1) accesses half-wave rectifying circuit through input resistance (R2), output bidirectional triode thyristor one end access three-phase supply input (L3) of optocoupler (OC1), the other end connects interchange input (AC2 ~) of single-phase rectification bridge (V1); Interchange input (AC1 ~) access three-phase supply input (L1) of single-phase rectification bridge (V1); The pull-in winding of relay (J) connects the DC output circuit of single-phase rectification bridge (V1).
2. a kind of three-phase supply phase interruption testing device according to claim 1, it is characterized in that having accessed divider resistance (R3) in the DC output circuit of described single-phase rectification bridge (V1), divider resistance (R3) is connected single-phase rectification bridge (V1) respectively direct current after connecting with the pull-in winding of relay (J) exports (DC+) and exports (DC-) with direct current.
3. a kind of three-phase supply phase interruption testing device according to claim 1, is characterized in that described optocoupler (OC1) is for zero cross fired bidirectional triode thyristor optocoupler.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410026370.2A CN104865454A (en) | 2014-01-15 | 2014-01-15 | Three-phase power supply phase loss detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410026370.2A CN104865454A (en) | 2014-01-15 | 2014-01-15 | Three-phase power supply phase loss detection device |
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| CN104865454A true CN104865454A (en) | 2015-08-26 |
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| CN201410026370.2A Pending CN104865454A (en) | 2014-01-15 | 2014-01-15 | Three-phase power supply phase loss detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004624A (en) * | 2018-09-14 | 2018-12-14 | 北京安润通电子技术开发有限公司 | A kind of the open phase detection module and its application method of three-phase point machine |
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| JP2005003626A (en) * | 2003-06-16 | 2005-01-06 | Matsushita Electric Ind Co Ltd | Connection status judging method of three-phase power source and device therefor |
| CN101509946A (en) * | 2009-01-09 | 2009-08-19 | 上海新时达电气股份有限公司 | Phase-lacking and power down detecting method for three phase AC input power supply |
| CN101614795A (en) * | 2009-07-21 | 2009-12-30 | 北京中纺锐力机电有限公司 | A kind of default-phase signal detection circuit for three-phase power |
| CN102426302A (en) * | 2011-09-15 | 2012-04-25 | 广州三晶电气有限公司 | Three-phase power input open-phase detection circuit |
| CN202217019U (en) * | 2011-09-15 | 2012-05-09 | 广州三晶电气有限公司 | Three-phase supply input open phase detection circuit |
| CN103434899A (en) * | 2013-09-03 | 2013-12-11 | 天津豪雅科技发展有限公司 | Integrated controller for elevator |
| CN203672981U (en) * | 2014-01-15 | 2014-06-25 | 刘培 | Three-phase power supply phase loss detection device |
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2014
- 2014-01-15 CN CN201410026370.2A patent/CN104865454A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005003626A (en) * | 2003-06-16 | 2005-01-06 | Matsushita Electric Ind Co Ltd | Connection status judging method of three-phase power source and device therefor |
| CN101509946A (en) * | 2009-01-09 | 2009-08-19 | 上海新时达电气股份有限公司 | Phase-lacking and power down detecting method for three phase AC input power supply |
| CN101614795A (en) * | 2009-07-21 | 2009-12-30 | 北京中纺锐力机电有限公司 | A kind of default-phase signal detection circuit for three-phase power |
| CN102426302A (en) * | 2011-09-15 | 2012-04-25 | 广州三晶电气有限公司 | Three-phase power input open-phase detection circuit |
| CN202217019U (en) * | 2011-09-15 | 2012-05-09 | 广州三晶电气有限公司 | Three-phase supply input open phase detection circuit |
| CN103434899A (en) * | 2013-09-03 | 2013-12-11 | 天津豪雅科技发展有限公司 | Integrated controller for elevator |
| CN203672981U (en) * | 2014-01-15 | 2014-06-25 | 刘培 | Three-phase power supply phase loss detection device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109004624A (en) * | 2018-09-14 | 2018-12-14 | 北京安润通电子技术开发有限公司 | A kind of the open phase detection module and its application method of three-phase point machine |
| CN109004624B (en) * | 2018-09-14 | 2023-07-14 | 北京安润通电子技术开发有限公司 | Open-phase detection module of three-phase turnout point machine and application method thereof |
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