CN203745550U - Three-phase power source phase loss detecting device - Google Patents
Three-phase power source phase loss detecting device Download PDFInfo
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- CN203745550U CN203745550U CN201320894884.0U CN201320894884U CN203745550U CN 203745550 U CN203745550 U CN 203745550U CN 201320894884 U CN201320894884 U CN 201320894884U CN 203745550 U CN203745550 U CN 203745550U
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- optocoupler
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- power supply
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Abstract
A three-phase power supply phase loss detecting device is provided. An alternating current power source is directly adopted as a circuit power source; detection results can be outputted through pull-in and release states of a relay; rectifier diodes and current limiting resistors can form an L1-L2 power source half-wave rectification circuit and an L2-L3 power source half-wave rectification circuit; and bidirectional controlled silicon rectifier optocouplers OC1 and OC2 can form a phase loss identification circuit and a relay control circuit. The three-phase power source phase loss detecting device has the advantages of simplicity, fewer components and cost performance.
Description
Technical field
The utility model relates to the safety guard of electric power system, specifically, is a kind of to the disconnected electric device detecting mutually of three-phase supply.
Background technology
Power supply open-phase protection is used widely as the safety guard of electric power system.The patent that retrieves disconnected phase context of detection is more, and its technical scheme mainly comprises following three types:
1. detect the variation of the voltage neutral point voltage-to-ground of three-phase supply, when three-phase voltage balance, the neutral point current potential of star connection is zero, and significantly displacement of neutral point current potential while there is open phase fault realizes breaking with voltage detecting circuit and detects mutually.Patents has CN103166188A phase loss protector for three-phase, a CN201616655U 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, whether have open phase fault by the identification of wave form analysis circuit, realize the disconnected detection mutually of power supply with this.Patents has protection control method, the CN2831566Y open phases of three-phase power source protection controller etc. of a CN102798770A frequency converter phase shortage.
3. gather respectively the voltage of three-phase supply, two-phase wherein or three-phase voltage signal are input to AND circuit identification, AND circuit output noble potential in the time that three-phase supply is normal, AND circuit output electronegative potential when open phase fault appears in the phase in three-phase supply or two-phase or three-phase, realizes the disconnected detection mutually of power supply with this.Patents has CN102426302A three-phase power input phase-loss detection circuit, a CN101413975A three-phase power input phase-loss detection circuit etc.
Technique scheme, the component number that testing circuit uses is more, and its testing circuit has adopted DC low-voltage power supply, need to obtain from power supply through power supply change-over device, and cost is higher compared with direct employing Alternating Current Power Supply scheme.
Utility model content
The purpose of this utility model is in order to overcome the deficiencies in the prior art, and the three-phase supply phase interruption testing device that a kind of cost performance is high is provided.
The utility model solves the technical scheme that its technical matters adopts: a kind of three-phase supply phase interruption testing device, comprise the power supply L1-L2 half-wave rectifying circuit being formed by commutation diode D1 and current-limiting resistance R1, the power supply L2-L3 half-wave rectifying circuit being formed by commutation diode D2 and current-limiting resistance R2, the disconnected phase identification circuit being formed by optocoupler 1OC1, optocoupler 2OC2, it is characterized in that, optocoupler 1OC1, optocoupler 2OC2 are bidirectional triode thyristor optocoupler, and optocoupler 1OC1 output connects one end of power supply L1 and relay J coil; Optocoupler 2OC2 output connects the other end of power supply L3 and relay J coil.
Described in three-phase supply phase interruption testing device, the coil rating voltage of relay J can be preferably identical with the voltage of three-phase supply; Circuit power directly adopts ac power supply.Described optocoupler 1OC1, optocoupler 2OC2 are zero cross fired bidirectional triode thyristor output optocoupler.
The utility model compared with prior art, has the following advantages and beneficial effect:
1. testing circuit directly adopts ac power supply, and compared with powering with the DC low-voltage of prior art, circuit elements number of devices reduces more than 50%, and production cost can have significantly reduction.
2. adopt zero cross fired bidirectional triode thyristor output optocoupler to implement voltage detecting and Control, simple circuit, Electro Magnetic Compatibility is good.
3. the power consumption of pick-up unit is lower, power supply total current deficiency 10mA, power and energy saving.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
In Fig. 1, L1, L2, L3 are the input terminal of power supply three-phase supply; J is miniature relay, the rated voltage of its pull-in winding is identical with the line voltage of power supply, by the disconnected phase information of moving together contact J-1, break contact J-2 output: J attracting state represents that three-phase supply is without open phase fault, J release conditions represent in three-phase supply wherein one mutually or two-phase or three-phase there is open phase fault; OC is optocoupler, is a kind of zero cross fired bidirectional triode thyristor output optocoupler, for electric voltage observation circuit and relay drive circuit.
The half-wave rectifying circuit of the commutation diode D1 in figure and current-limiting resistance R1 composition L1-L2 power supply, C1 is filter capacitor; Be made up of the half-wave rectifying circuit of L2-L3 power supply commutation diode D2 and current-limiting resistance R2, C2 is filter capacitor; This circuit uses OC1 and two optocouplers of OC2 to detect input power, and the input end of OC1, OC2 is connected in series respectively current-limiting resistance R1, R2 and accesses afterwards the half-wave rectifying circuit of L1-L2, L2-L3.The discharge capacity of filter capacitor C1 and C2 is designed to drive OC1, OC2 to maintain conducting state 1/20 to 1/40 second.In the time that power supply is normal, C1 and C2 both end voltage are higher; In the time of L1, L2, any phase voltage disappearance of L3, C1 or C2 both end voltage can rapidly disappear.When C1 and C2 both end voltage are higher, trigger the conducting of output bidirectional triode thyristor by the input light emitting diode of OC1, OC2; C1 or C2 both end voltage disappear and cause its corresponding output bidirectional triode thyristor blocking-up.OC1 output connects one end of L1 and relay J coil; OC2 output connects the other end of L3 and relay J coil, thereby form AND circuit, the adhesive of relay J and release is implemented to control.
Below with embodiment, the utility model has been carried out launching to describe by reference to the accompanying drawings, this description does not have restricted, the embodiment that shown in accompanying drawing, also just the utility model forms, and the technical solution of the utility model is not limited to this.Those of ordinary skill in the art should be understood that, in the situation that not departing from the utility model design philosophy, and the actual variation in some details of implementing also to have of the present utility model.So as long as meet aim of the present utility model, these variations include within protection domain of the present utility model.
Claims (3)
1. a three-phase supply phase interruption testing device, comprise power supply (L1)-(L2) half-wave rectifying circuit being formed by commutation diode (D1) and current-limiting resistance (R1), power supply (L2)-(L3) half-wave rectifying circuit being formed by commutation diode (D2) and current-limiting resistance (R2), by optocoupler 1 (OC1), the disconnected phase identification circuit of optocoupler 2 (OC2) composition, it is characterized in that, optocoupler 1 (OC1), optocoupler 2 (OC2) is bidirectional triode thyristor optocoupler, optocoupler 1 (OC1) output connects one end of power supply (L1) and relay (J) coil, optocoupler 2 (OC2) output connects the other end of power supply (L3) and relay (J) coil.
2. a kind of three-phase supply phase interruption testing device according to claim 1, is characterized in that, the coil rating voltage of described relay (J) is identical with the voltage of three-phase supply; Circuit power directly adopts ac power supply.
3. a kind of three-phase supply phase interruption testing device according to claim 1, is characterized in that, described optocoupler 1 (OC1), optocoupler 2 (OC2) are zero cross fired bidirectional triode thyristor output optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320894884.0U CN203745550U (en) | 2013-12-24 | 2013-12-24 | Three-phase power source phase loss detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320894884.0U CN203745550U (en) | 2013-12-24 | 2013-12-24 | Three-phase power source phase loss detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203745550U true CN203745550U (en) | 2014-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320894884.0U Expired - Fee Related CN203745550U (en) | 2013-12-24 | 2013-12-24 | Three-phase power source phase loss detecting device |
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| CN (1) | CN203745550U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018983A (en) * | 2016-07-13 | 2016-10-12 | 苏州长量电器有限公司 | Phase failure detection single-sided comprehensive detection method |
-
2013
- 2013-12-24 CN CN201320894884.0U patent/CN203745550U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018983A (en) * | 2016-07-13 | 2016-10-12 | 苏州长量电器有限公司 | Phase failure detection single-sided comprehensive detection method |
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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: 20140730 Termination date: 20141224 |
|
| EXPY | Termination of patent right or utility model |