CN207281185U - A kind of lack detection circuit of three-phase voltage system - Google Patents
A kind of lack detection circuit of three-phase voltage system Download PDFInfo
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- CN207281185U CN207281185U CN201721248957.3U CN201721248957U CN207281185U CN 207281185 U CN207281185 U CN 207281185U CN 201721248957 U CN201721248957 U CN 201721248957U CN 207281185 U CN207281185 U CN 207281185U
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Abstract
The utility model belongs to electrician's detection technique field, discloses a kind of lack detection circuit of three-phase voltage system, including：Coupling transformer, and the phase shortage identification circuit being made of current-limiting resistance, the first photo-coupler, the second photo-coupler；When three-phase voltage system not phase shortage, coupling transformer output vector and for 0, when three-phase voltage system phase shortage, coupling transformer output vector and is not zero.The vector sum that coupling transformer exports is converted into by phase shortage and non-phase shortage two states signal by current-limiting resistance, the first optical coupler, the second optical coupler.
Description
Technical field
The utility model belongs to electrician's detection technique field, more particularly to a kind of lack detection circuit of three-phase voltage system.
Background technology
In three-phase power supply system, phase shortage can cause system unstable, or even cisco unity malfunction, therefore general three phase supply
System needs to have pile defection function.
A kind of method for detecting input phase failure of three-phase input device (number of patent application：CN201410526200) provide by three
After phase electric rectification, by sampling the frequency of waveform peak after rectification to determine whether the method for phase shortage, this method need to adopt in real time
Collect the voltage after rectification, acquisition system is complicated.Phase sequence and lack detection circuit (number of patent application for three-phase electricity：
CN201420594151 a kind of three-phase electric power open phase detection circuit) is provided, each of three-phase electricity was communicated into partial pressure, optocoupler respectively
Isolation, voltage compare three tunnel default phase signals of output, and circuit devcie is more, relative complex.Alternating current lack detection circuit (patent application
Number：CN201420717053) a kind of detection method of three-phase lack phase is provided, a relay is controlled per phase voltage, circuit is opposite
Simply, but relay easily interference vibrated is used, relay exports the reality of default phase signal there are actuation time during phase shortage
When property is poor.
Utility model content
The shortcomings that for the above-mentioned prior art, the purpose of this utility model is to provide a kind of phase shortage inspection of three-phase voltage system
Slowdown monitoring circuit, compared with prior art, technical solutions of the utility model can reduce the complexity and reliability of detection circuit, without dividing
Not Pan Duan per phase voltage whether phase shortage.
To reach above-mentioned purpose, the utility model adopts the following technical solution is achieved.
A kind of lack detection circuit of three-phase voltage system, the lack detection circuit include：Coupling transformer, and by limiting
Leakage resistance, the first photo-coupler, the phase shortage identification circuit of the second photo-coupler composition；The three-phase voltage system includes A phases, B phases
With C phases；
The coupling transformer includes an output winding and three input windings with the identical number of turn；The coupling becomes
Three input windings of depressor are corresponding in turn to A phases, B phases and the C phases for being electrically connected three-phase voltage system；
The Same Name of Ends of the output winding of the coupling transformer connects one end of the current-limiting resistance, the current-limiting resistance
The other end connects the cathode of the first photo-coupler primary side, and the different name end of the output winding connects first photo-coupler
The anode of primary side；
The primary side reverse parallel connection of the primary side of first photo-coupler and second photo-coupler, first optical coupling
The secondary reverse parallel connection of the secondary of device and second photo-coupler, and the both ends of the secondary of first photo-coupler are as three
The output terminal of the lack detection circuit of phase electric system.
The characteristics of technical solutions of the utility model and further it is improved to：
(1) three-phase voltage system is three-phase three-wire system, wherein, three of the coupling transformer input the of the same name of windings
End is sequentially connected A phases positive voltage output end, B phases positive voltage output end and C phase positive voltage output ends respectively, three inputs around
The different name end of group is sequentially connected B phase negative voltages output terminal, C phase negative voltage output terminals and A phase negative voltage output terminals respectively.
(2) three-phase voltage system is three-phase four-wire system, wherein, three of the coupling transformer input the of the same name of windings
End is sequentially connected the A phases positive voltage output end, B phases positive voltage output end and C phase positive voltage output ends respectively, and described three defeated
The different name end for entering winding connects the neutral conductor of the three-phase voltage system respectively.
(3) it is connected with primary side divider resistance between the cathode and anode of the first photo-coupler primary side.
(4) the first secondary divider resistance and second have been sequentially connected in series between the cathode and anode of the first photo-coupler secondary
Secondary divider resistance, the output terminal of the both ends of the second secondary divider resistance as the lack detection circuit of three-phase voltage system.
The utility model provides a kind of lack detection circuit of three-phase voltage system, judges to be by the vector sum of three-phase electricity
No phase shortage.Three-phase electricity is subjected to electromagnetic coupled, asks for the vector sum that three-phase is electrically coupled.The vector that full symmetric three-phase is electrically coupled
With for 0, when lacking any one phase or two-phase in three-phase electricity, the vector sum result of coupling is not 0.After reading coupling
Vector sum is to determine whether phase shortage.The utility model reduces device using the inductance collection three-phase input voltage of a coupling
Quantity, reduces system complexity, has saved system cost.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the lack detection circuit schematic diagram one for the three-phase voltage system that the utility model embodiment provides；
Fig. 2 is the lack detection circuit schematic diagram two for the three-phase voltage system that the utility model embodiment provides；
Fig. 3 is the lack detection circuit schematic diagram three for the three-phase voltage system that the utility model embodiment provides；
Fig. 4 is the circuit diagram for the coupling transformer that the utility model embodiment provides.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained, shall fall within the protection scope of the present invention.
A kind of lack detection circuit of three-phase voltage system, as shown in Figure 1, the lack detection circuit includes：Couple transformation
Device, and the phase shortage identification circuit being made of current-limiting resistance, the first photo-coupler, the second photo-coupler；The three-phase voltage system
Include A phases, B phases and C phases；
The coupling transformer includes an output winding and three input windings with the identical number of turn；The coupling becomes
Three input windings of depressor are corresponding in turn to A phases, B phases and the C phases for being electrically connected three-phase voltage system；
The Same Name of Ends of the output winding of the coupling transformer connects one end of the current-limiting resistance, the current-limiting resistance
The other end connects the cathode of the first photo-coupler primary side, and the different name end of the output winding connects first photo-coupler
The anode of primary side；
The primary side reverse parallel connection of the primary side of first photo-coupler and second photo-coupler, first optical coupling
The secondary reverse parallel connection of the secondary of device and second photo-coupler, and the both ends of the secondary of first photo-coupler are as three
The output terminal of the lack detection circuit of phase electric system.
Specifically, the three-phase voltage system is three-phase three-wire system, wherein, three input windings of the coupling transformer
Same Name of Ends is sequentially connected A phases positive voltage output end, B phases positive voltage output end and C phase positive voltage output ends respectively, and described three defeated
The different name end for entering winding is sequentially connected B phase negative voltages output terminal, C phase negative voltage output terminals and A phase negative voltage output terminals respectively.
Again specifically, the three-phase voltage system is three-phase four-wire system, wherein, three input windings of the coupling transformer
Same Name of Ends be sequentially connected the A phases positive voltage output end, B phases positive voltage output end and C phase positive voltage output ends respectively, it is described
The different name end of three input windings connects the neutral conductor of the three-phase voltage system respectively.
Further, as shown in Fig. 2, being connected with primary side partial pressure electricity between the cathode and anode of the first photo-coupler primary side
Hinder R1.When the three-phase voltage system not phase shortage, but when three-phase electricity does not couple completely, the output winding of coupling transformer can be defeated
Go out small voltage, the small voltage that the primary side divider resistance is used for the output winding output to the coupling transformer is divided
Pressure, so that lack detection circuit is more stablized.
Further, as shown in figure 3, being sequentially connected in series first between the cathode and anode of the first photo-coupler secondary
Secondary divider resistance R2 and the second secondary divider resistance R3, the phase shortage of the both ends of the second secondary divider resistance as three-phase voltage system
The output terminal of detection circuit.
The utility model embodiment also provides a kind of method for detecting open phase of three-phase voltage system, and the method is applied to above-mentioned
Lack detection circuit described in embodiment, described method includes following steps：
The secondary output impedance of the first photo-coupler is detected, if the secondary output impedance of first photo-coupler is high resistant
Resist, then the three-phase voltage system phase shortage, if the secondary output impedance of first photo-coupler is Low ESR, the three-phase electricity
System not phase shortage.
Specifically, remember that the A phase voltages that the three-phase voltage system includes are UA=U sin (x), B phase voltage are UB=U sin
(x+120), C phase voltages are UC=U sin (x-120)；
When the three-phase voltage system not phase shortage, the secondary output voltage of coupling transformer is 0 volt, the first photo-coupler
Primary side is not turned on, and the primary side of the second photo-coupler is not turned on, so that the secondary output of first photo-coupler is high impedance；
When the three-phase voltage system lacks any one phase voltage in A phase voltages, B phase voltages, C phase voltages, the coupling
The secondary output voltage of transformer is the first alternating voltage of sine wave：When the first alternating voltage of the sine wave
Amplitude when being more than zero, the primary side conducting of first photo-coupler, so that the secondary output of first photo-coupler is low
Impedance；When the amplitude of the first alternating voltage of the sine wave is less than zero, the primary side conducting of second photo-coupler,
It is Low ESR so as to the secondary output of first photo-coupler；
The amplitude of first alternating voltage of the sine wave is equal with the amplitude of three-phase voltage in three-phase voltage system, institute
The phase for stating the first alternating voltage of sine wave differs 180 degree with the phase of institute's phase shortage voltage in three-phase voltage system；
When the three-phase voltage system lacks any two-phase voltage in A phase voltages, B phase voltages, C phase voltages, the coupling
The secondary output voltage of transformer is the second alternating voltage of sine wave：When the second alternating voltage of the sine wave
Amplitude when being more than zero, the primary side conducting of first photo-coupler, so that the secondary output of first photo-coupler is low
Impedance；When the amplitude of the second alternating voltage of the sine wave is less than zero, the primary side conducting of second photo-coupler,
It is Low ESR so as to the secondary output of first photo-coupler.
The amplitude of second alternating voltage of the sine wave is equal with the amplitude of three-phase voltage in three-phase voltage system, institute
State the phase of the second alternating voltage of sine wave and the phase of phase shortage voltage is not identical in three-phase voltage system.
Exemplary, full symmetric three-phase electricity, voltage magnitude is equal, and phase differs 120 degree.Can by the method for mathematics
To be expressed as：
UA=Usin (x), UB=Usin (x+120), UC=Usin (x-120), wherein U be phase voltage crest voltage, UA
For A phase voltage instantaneous values, UBFor B phase voltage instantaneous values, UCFor C phase voltage instantaneous values.
When three-phase is full symmetric, the sum of instantaneous value of three-phase electricity is：
SUM=UA+UB+UC=Usin (x)+Usin (x+120 °)+Usin (x-120 °)=0；
When an arbitrarily scarce phase in three-phase electricity, exemplified by lacking A phases, UA=0；
SUM=UA+UB+UC=0+Usin (x+120 °)+Usin (x-120 °)=- Usin (x)
When arbitrarily scarce two-phase in three-phase electricity, to lack A, exemplified by B phases, UA=0, UB=0；
SUM=UA+UB+UC=0+0+Usin (x-120 °)=Usin (x-120 °)
By magnetic-coupled mode, can by instantaneous voltage and be converted to vector sum so that by mathematic(al) representation
As a result realized by circuit.Coupling transformer input and output schematic diagram is illustrated in figure 4,3 coils of primary side are three-phase input, former
Side coil turn is all mutually Np, and one coil of secondary exports for vector sum, number of turn Ns.If three-phase input is expressed as：
120 ° of 0 ° of U1=U ∠, U2=U ∠, ∠ -120 ° of U3=U；According to the principle of mutual inductance, vector sum output result is per mutually input coupling
Close the vector sum of voltage：Uo=Ns/Np* (U1+U2+U3).
The utility model embodiment provides a kind of method for detecting open phase of three-phase four-wire system.Specifically implementation process is：Will
The Same Name of Ends of three input terminals of coupling transformer meets firewire A, B, C of three-phase input respectively, and the different name end of three-phase input end is complete
Connect to neutral N in portion.The vector of three-phase input is expressed as：UAN0 ° of=U ∠, UBN120 ° of=U ∠, UCN∠ -120 ° of=U；
When three-phase phase voltage not phase shortage, since three-phase is full symmetric, vector sum 0；
When three-phase phase voltage lacks any one phase, if lacking A phases, vector sum is 180 ° of U ∠；If lacking B phases, vector sum is
U∠-60°；If lacking C phases, vector sum is 60 ° of U ∠.
When three-phase phase voltage lacks any two-phase, if lacking A, B phase, vector sum is ∠ -120 ° of U；If lacking B, C, mutually swear
Amount and be 0 ° of U ∠；If lacking A, C two-phase, vector sum is 120 ° of U ∠.
The utility model embodiment provides a kind of method for detecting open phase of three-phase three-wire system.Specifically implementation process is：Will
The Same Name of Ends of three input terminals of coupling transformer meets firewire A, B, C of three-phase input respectively, the different name end of three-phase input end according to
It is secondary to meet B, C, A.The vector of three-phase input is expressed as：UAB0 ° of=U ∠, UBC120 ° of=U ∠, UCA∠ -120 ° of=U；
When three-phase line voltage not phase shortage, since three-phase is full symmetric, vector sum 0；
When three-phase line voltage lacks any one phase, if lacking AB phases, vector sum is ∠ -180 ° of U；If BC phases, vector sum
For ∠ -60 ° of U；If lacking AC phases, vector sum is 60 ° of U ∠；
When three-phase line voltage lacks any two-phase, if lacking AB, BC two-phase, vector sum is ∠ -120 ° of U；If lack AC, BC
Two-phase, phasor1 and be 0 ° of U ∠；If lacking AB, AC two-phase, vector sum is 120 ° of U ∠.
It should be noted that the method for detecting open phase provided according to the utility model embodiment, can expand to completely
In the balanced system of any number of phases.Amplitude is of substantially equal between the balanced system refers to per adjacent two-phase, and phase difference is solid
Fixed electrical angle, the phase difference of all phases, which is added, is equal to 360 electrical angles.
The above, is only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model discloses
Or replace, it should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with the power
Subject to the protection domain that profit requires.
Claims (5)
1. a kind of lack detection circuit of three-phase voltage system, it is characterised in that the lack detection circuit includes：Couple transformation
Device, and the phase shortage identification circuit being made of current-limiting resistance, the first photo-coupler, the second photo-coupler；The three-phase voltage system
Include A phases, B phases and C phases；
The coupling transformer includes an output winding and three input windings with the identical number of turn；The coupling transformer
Three input windings be corresponding in turn to be electrically connected three-phase voltage system A phases, B phases and C phases；
The Same Name of Ends of the output winding of the coupling transformer connects one end of the current-limiting resistance, the current-limiting resistance it is another
End connects the cathode of the first photo-coupler primary side, and the different name end of the output winding connects the first photo-coupler primary side
Anode；
The primary side reverse parallel connection of the primary side of first photo-coupler and second photo-coupler, first photo-coupler
The secondary reverse parallel connection of secondary and second photo-coupler, and the both ends of the secondary of first photo-coupler are as three-phase electricity
The output terminal of the lack detection circuit of system.
A kind of 2. lack detection circuit of three-phase voltage system according to claim 1, it is characterised in that the three-phase electricity system
Unite as three-phase three-wire system, wherein, the Same Name of Ends of three input windings of the coupling transformer are sequentially connected A phase positive voltages respectively
Output terminal, B phases positive voltage output end and C phase positive voltage output ends, the different name end of three inputs winding are sequentially connected B respectively
Phase negative voltage output terminal, C phase negative voltage output terminals and A phase negative voltage output terminals.
A kind of 3. lack detection circuit of three-phase voltage system according to claim 1, it is characterised in that the three-phase electricity system
Unite as three-phase four-wire system, wherein, the Same Name of Ends of three input windings of the coupling transformer are being sequentially connected the A phases just respectively
Voltage output end, B phases positive voltage output end and C phase positive voltage output ends, the different name end of three inputs winding connect respectively
The neutral conductor of the three-phase voltage system.
4. the lack detection circuit of a kind of three-phase voltage system according to claim 1, it is characterised in that in the first optical coupling
Primary side divider resistance is connected between the cathode and anode of device primary side.
5. the lack detection circuit of a kind of three-phase voltage system according to claim 1, it is characterised in that in the first optical coupling
The first secondary divider resistance and the second secondary divider resistance, the second secondary point have been sequentially connected in series between the cathode and anode of device secondary
Output terminal of the both ends of piezoresistance as the lack detection circuit of three-phase voltage system.
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| CN201721248957.3U CN207281185U (en) | 2017-09-27 | 2017-09-27 | A kind of lack detection circuit of three-phase voltage system |
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| CN201721248957.3U CN207281185U (en) | 2017-09-27 | 2017-09-27 | A kind of lack detection circuit of three-phase voltage system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932616A (en) * | 2019-04-02 | 2019-06-25 | 国家电网有限公司 | 10kV distribution lacks judgement and the localization method of a phase fault |
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2017
- 2017-09-27 CN CN201721248957.3U patent/CN207281185U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932616A (en) * | 2019-04-02 | 2019-06-25 | 国家电网有限公司 | 10kV distribution lacks judgement and the localization method of a phase fault |
| CN109932616B (en) * | 2019-04-02 | 2021-01-08 | 国家电网有限公司 | Method for judging and positioning one-phase-lack fault of 10kV distribution network |
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