CN105356416B - A kind of three-phase alternating voltage phase sequence monitoring system - Google Patents
A kind of three-phase alternating voltage phase sequence monitoring system Download PDFInfo
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- CN105356416B CN105356416B CN201510906396.0A CN201510906396A CN105356416B CN 105356416 B CN105356416 B CN 105356416B CN 201510906396 A CN201510906396 A CN 201510906396A CN 105356416 B CN105356416 B CN 105356416B
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Abstract
The present invention provides a kind of three-phase alternating voltage phase sequence monitoring system, including：It is depressured filtering shaping circuit；Three-phase alternating voltage by decompression filtering shaping circuit processing is made comparisons with reference voltage and the comparison circuit of three road comparative results is exported；The logic circuit for judging signal is detected and exported to the phase sequence of three-phase alternating voltage according to three road comparative results；According to the Drive Protecting Circuit for judging signal driving relay；And indication signal is produced according to the output signal of Drive Protecting Circuit, the correct indication signal of phase sequence is exported when the phase sequence of three-phase alternating voltage is correct；The relay of alarm indication signal is exported when the phase sequence of three-phase alternating voltage is disorderly or phase shortage occurs.The present invention is detected by the phase sequence to three-phase alternating voltage, and relay is driven with this, and then protects the safety of electrical equipment, is prevented effectively from the disorderly unnecessary loss brought with phase shortage problem of phase sequence；Simultaneously because the present invention is integrated in the circuit module of chip, small volume is easy to operate, and accuracy of detection is high.
Description
Technical field
The present invention relates to Electrical Safety field, more particularly to a kind of three-phase alternating voltage phase sequence monitoring system.
Background technology
The phase sequence of three-phase alternating current include positive sequence, negative phase-sequence and zero sequence, when three-phase alternating current is applied, phase ordered pair electric power, electronics,
Instrument, the safe operation automatically controlled with equipment in field of power electronics play an important roll, and generally require detection and judge three-phase
Whether the phase sequence of AC power is correct and with the presence or absence of phase shortage problem, if phase sequence is wrong or produces phase shortage it is necessary in time to electricity
Device in road is protected to avoid the damage of device.When three-phase photovoltaic grid-connected inverting device is grid-connected, if inverter and electricity
The phase sequence of net is inconsistent, will cause larger dash current, or even damage the devices such as power model.In addition, for only allowing list
Mutually for the equipment of rotation, if phase sequence is wrong to be likely to result in the damage of its rotary device, such as man lift makes because of the change of phase sequence
Traffic direction opposite to the predetermined direction, may jeopardize personal safety.Therefore, it is necessary to which the phase sequence to three-phase alternating current is examined
Survey.
The Phase sequence detection of three-phase alternating voltage of the prior art generally uses following three kinds of methods：
1st, the phase sequence of three-phase alternating voltage is detected using an electric capacity and two bulbs, but this method can only
Short-term operation, otherwise can burn out bulb, although simple in construction, but electric volume is larger, bad to install；2nd, using phase-sequence meter, the party
Method equally can only short-term operation, otherwise can burn out；3rd, using the asynchronous motor of known steering, the premise of this method is to need to know
The steering of road correct phase sequence, otherwise can not judge.
Electronics now, electric power, instrument, automatically control with field of power electronics, using embedded system as control core,
Xiang Geng little, thinner development turn into universal trend, therefore, how circuit are further reduced on the premise of Phase sequence detection is completed
Scale, simplifies circuit, while the accuracy for improving three-phase alternating voltage Phase sequence detection is urgently solved as those skilled in the art
One of certainly the problem of.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of three-phase alternating voltage phase sequence prison
Control system, for solving, three-phase alternating voltage circuit of testing the phase sequence volume is big, accuracy is low in the prior art, complex operation etc. is asked
Topic.
In order to achieve the above objects and other related objects, the present invention provides a kind of three-phase alternating voltage phase sequence monitoring system,
The three-phase alternating voltage phase sequence monitoring system at least includes：
It is depressured filtering shaping circuit, comparison circuit, logic circuit, Drive Protecting Circuit and relay；
It is described decompression filtering shaping circuit receive three-phase alternating voltage, three-phase alternating voltage include the first cross streams voltage,
Second cross streams voltage and third phase alternating voltage, the decompression filtering shaping circuit drop respectively to three-phase alternating voltage
Pressure, filtering and Shape correction；
The comparison circuit is connected with the decompression filter shape module, will be by the decompression filtering shaping circuit processing
Three-phase alternating voltage made comparisons respectively with a reference voltage and export three road comparative results；
The logic circuit is connected with the comparison circuit, and the three road comparative results exported according to the comparison circuit are to three
The phase sequence of cross streams voltage is detected, and output one judges signal；
The Drive Protecting Circuit is connected with the logic circuit, and the judgement signal exported according to the logic circuit drives
The relay；
The relay produces indication signal according to the output signal of the Drive Protecting Circuit, when three-phase alternating voltage
Phase sequence correct indication signal is exported when phase sequence is correct；When the phase sequence of three-phase alternating voltage is disorderly or phase shortage occurs, output alarm refers to
Show signal.
Preferably, 120 ° of the first cross streams voltage, the third phase described in the delayed phase of the second cross streams voltage
120 ° of second cross streams voltage described in the delayed phase of alternating voltage, the 3rd described in the delayed phase of the first cross streams voltage
120 ° of cross streams voltage.
Preferably, the comparison module includes 3 comparators, and three by the decompression filtering shaping circuit processing are intersected
Stream voltage is connected to the inverting input of each comparator, and the normal phase input end of each comparator connects the reference voltage.
It is highly preferred that the reference voltage is not less than zero and the no more than absolute value of three-phase alternating voltage crosspoint amplitude.
It is highly preferred that the logic circuit includes d type flip flop, three road comparative results corresponding to three-phase alternating voltage pass through
The set end of the d type flip flop is connected to computing, the first comparative result corresponding to the first cross streams voltage is connected to
The clock end of the d type flip flop, corresponding second comparative result of the second cross streams voltage is connected to the number of the d type flip flop
According to input, the reset terminal ground connection of the D triggerings.
Preferably, in addition to power circuit, the power circuit receives three-phase alternating voltage, produces DC voltage and thinks institute
Three-phase alternating voltage phase sequence monitoring system is stated to power.
It is highly preferred that the power circuit is capacitance-resistance voltage reduction circuit, including three phase full wave rectification unit, capacitor filtering list
Member, one-level voltage regulation unit, partial pressure unit and two grades of voltage regulation units.
Preferably, in addition to the signal lamp of the relay is connected to, when the relay is exporting the phase sequence just
The indicator lamp is lighted during true indication signal；When the relay exports the alarm indication signal, the indicator lamp extinguishes.
As described above, the three-phase alternating voltage phase sequence monitoring system of the present invention, has the advantages that：
The three-phase alternating voltage phase sequence monitoring system of the present invention is detected by the phase sequence to three-phase alternating voltage, with this
Relay is driven, and then protects the safety of electrical equipment, it is to avoid unnecessary loss；Simultaneously because the three-phase alternating current of the present invention
Pressure phase sequence monitoring system is integrated in the circuit module of chip, and small volume is easy to operate, and accuracy of detection is high.
Brief description of the drawings
Fig. 1 is shown as the three-phase alternating voltage phase sequence monitoring system schematic diagram of the present invention.
Fig. 2 is shown as the phase schematic diagram of three-phase alternating voltage.
Fig. 3 is shown as the structural representation of the comparison circuit of the three-phase alternating voltage phase sequence monitoring system of the present invention.
Fig. 4 is shown as the structural representation of the logic circuit of the three-phase alternating voltage phase sequence monitoring system of the present invention.
Fig. 5 is shown as the structural representation of the relay of the three-phase alternating voltage phase sequence monitoring system of the present invention.
Fig. 6 is shown as the structural representation of the power circuit of the three-phase alternating voltage phase sequence monitoring system of the present invention.
Waveform when the three-phase alternating voltage phase sequence monitoring system that Fig. 7~8 are shown as the present invention detects correct phase sequence shows
It is intended to.
Waveform when the three-phase alternating voltage phase sequence monitoring system that Fig. 9~10 are shown as the present invention detects phase sequence disorder shows
It is intended to.
Waveform when the three-phase alternating voltage phase sequence monitoring system that Figure 11~13 are shown as the present invention detects phase shortage is illustrated
Figure.
Component label instructions
1 three-phase alternating voltage phase sequence monitoring system
11 decompression filtering shaping circuits
12 comparison circuits
121~123 the first~the 3rd comparators
13 logic circuits
131 d type flip flops
132 3 inputs and door
14 Drive Protecting Circuits
15 relays
16 power circuits
161 three phase full wave rectification units
162 capacitor filtering units
163 one-level voltage regulation units
164 partial pressure units
165 2 grades of voltage regulation units
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
Refer to Fig. 1~Figure 13.It should be noted that the diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, then in schema only display with relevant component in the present invention rather than according to package count during actual implement
Mesh, shape and size are drawn, and kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its
Assembly layout kenel may also be increasingly complex.
As shown in figure 1, the present invention provides a kind of three-phase alternating voltage phase sequence monitoring system 1, the three-phase alternating voltage phase
Sequence monitoring system 1 includes：
Be depressured filtering shaping circuit 11, comparison circuit 12, logic circuit 13, Drive Protecting Circuit 14, relay 15 and
Power circuit 16.
As shown in figure 1, the decompression filtering shaping circuit 11 receives three-phase alternating voltage, three-phase alternating voltage includes first
Cross streams voltage L1, the second cross streams voltage L2 and third phase alternating voltage L3,11 pair three of the decompression filtering shaping circuit
Cross streams voltage is depressured, filtered and Shape correction respectively.
Specifically, as shown in Fig. 2 the phase difference of three-phase alternating voltage is 120 °, and the second cross streams voltage L2
First cross streams voltage L1 120 ° of phase described in delayed phase, second described in the delayed phase of the third phase alternating voltage L3
120 ° of cross streams voltage L2 phase, third phase alternating voltage L3 phase described in the delayed phase of the first cross streams voltage L1
120 ° of position.The decompression filtering shaping circuit 11 is respectively to the first cross streams voltage L1, the second cross streams voltage L2
And the third phase alternating voltage L3 carries out preliminary processing, including but not limited to it is depressured, filters and Shape correction.In this reality
Apply in example, the three-phase alternating voltage amplitude reduction after processing, and it is positive half period waveform only to retain amplitude.The decompression filtering
Shaping circuit 11 exports three road reshaping signals, respectively the first phase reshaping signal L1 ', the second phase reshaping signal L2 ' and the 3rd
Phase reshaping signal L3 '.
As shown in figure 1, the comparison circuit 12 is connected with the decompression filter shape module, will be by the decompression filtering
The three-phase alternating voltage of the processing of shaping circuit 11 is made comparisons with a reference voltage Vref and exports three road comparative results respectively.
Specifically, as shown in figure 3, in the present embodiment, the comparison module compares including first comparator 121, second
The comparator 123 of device 122 and the 3rd.The inverting input of the first comparator 121 connects the first phase reshaping signal
L1 ', normal phase input end connects the reference signal Vref, exports the first comparative result C1；Second comparator 122 it is anti-phase
Input connects the second phase reshaping signal L2 ', and normal phase input end connects the reference signal Vref, and knot is compared in output second
Fruit C2；The inverting input of 3rd comparator 123 connects the third phase reshaping signal L3 ', normal phase input end connection institute
Reference signal Vref is stated, the 3rd comparative result C3 is exported；The three-phase alternating current handled by the decompression filtering shaping circuit 11
Pressure is connected to the inverting input of each comparator, and the normal phase input end of each comparator connects the reference voltage Vref.
In the present embodiment, due to the first phase reshaping signal L1 ', the second phase reshaping signal L2 ' and the third phase shaping
Signal L3 ' is connected to the inverting input of comparator, therefore the reference voltage Vref is set as that 0~V3, wherein V3 are
The absolute value of three-phase alternating voltage crosspoint amplitude.As the first phase reshaping signal L1 ', the second phase reshaping signal L2 '
And the third phase reshaping signal L3 ' is connected to the normal phase input end of comparator, and the reference voltage Vref is connected
When the inverting input of comparator, or subsequent logic circuit change, the span of the reference voltage will become
Change, can be done according to overall logic relation into specific setting, in the particular circuit configurations for the comparison module for understanding the present embodiment
And on the basis of the span of the reference voltage, physical circuit and institute that those skilled in the art can be to the comparison module
The adjustment that reference voltage does adaptability is stated, and the adjustment is both contained in disclosed content.
As shown in figure 1, the logic circuit 13 is connected with the comparison circuit 12, exported according to the comparison circuit 12
Three road comparative results are detected to the phase sequence of three-phase alternating voltage, and output one judges signal Q.
Specifically, the logic circuit 13 receives the first comparative result C1, the second comparative result C2 and described
3rd comparative result C3, and carry out logical operation and detected with the phase sequence to three-phase alternating voltage, acquisition judges signal Q.Institute
State logic circuit 13 and include but is not limited to d type flip flop, single-chip microcomputer, XOR gate and OR gate, can arbitrarily realize the logic of Phase sequence detection
Circuit 13 is applied to the present invention.As shown in figure 4, in the present embodiment, the logic circuit 13 is realized using d type flip flop 131.
The first comparative result C1 is connected to the clock end CK of the d type flip flop 131；The second comparative result C2 is connected to described
The data input pin D of d type flip flop 131；The first comparative result C1, the second comparative result C2 and the described 3rd compare knot
Fruit C3 is by being connected to the set end SET of the d type flip flop 131 with computing, in the present embodiment, passes through three inputs and door 132
Realize and computing, what is be made up of any logical device is applied to the present invention with logic circuit 13, is not limited with the present embodiment；
The reset terminal RST ground connection of the d type flip flop 131.
As shown in figure 1, the Drive Protecting Circuit 14 is connected with the logic circuit 13, it is defeated according to the logic circuit 13
The judgement signal gone out drives the relay 15.
Specifically, the Drive Protecting Circuit 14 exports corresponding drive signal Drv according to the judgement signal Q.
As shown in figure 1, the relay 15 produces indication signal according to the output signal of the Drive Protecting Circuit 14, when
Phase sequence correct indication signal is exported when the phase sequence of three-phase alternating voltage is correct；When the phase sequence of three-phase alternating voltage is disorderly or lacks
Alarm indication signal is exported during phase.
Specifically, it is illustrated in figure 5 the most typical structure of relay 15, including coil L, armature K, normally opened contact d1, often
Closed contact d2 and spring S.After the relay 15 receives the drive signal Drv, the coil L is according to the driving
Signal Drv produces electromagnetic force, if the phase sequence of three-phase alternating voltage is correct, and the coil L excitations are produced described in electromagnetic attracting force
Armature K is closed to the normally opened contact d2, has electric current to flow through, and exports the correct indication signal of phase sequence, and subsequent conditioning circuit turns on and can be just
Often work；If the phase sequence of three-phase alternating voltage is disorderly or has the situation of phase shortage, the coil L demagnetizations, electromagnetic force disappears,
In the presence of the spring S, the armature K returns to the normally opened contact d1, and no current flows through, and exports alarm indication signal,
Subsequent conditioning circuit is disconnected, it is impossible to normal work.The relay 15 is also connected with a signal lamp, when the relay 15 is exported
The indicator lamp is lighted during the phase sequence correct indication signal；Described in when the relay 15 exports the alarm indication signal
Indicator lamp extinguishes；Output signal information can more intuitively be obtained.
As shown in figure 1, the power circuit 16 receives three-phase alternating voltage, produce DC voltage and think the three-phase alternating current
Voltage phase sequence monitoring system is powered.
Specifically, as shown in fig. 6, in the present embodiment, the power circuit 16 is capacitance-resistance voltage reduction circuit, including three-phase is complete
Ripple rectification unit 161, capacitor filtering unit 162, one-level voltage regulation unit 163, partial pressure unit 164 and two grades of voltage regulation units 165.
Three-phase alternating voltage passes through the three phase full wave rectification unit 161, the capacitor filtering unit 162 and the one-level voltage stabilizing
Unit 163 produces first voltage signal V1, in the present embodiment, and the first voltage V1 is 27V, for for the relay 15
Power supply.The first voltage V1 produces second voltage V2 by the partial pressure unit 164 and two grades of voltage regulation units 165,
In the present embodiment, the second voltage V2 be 15V, for for the comparison circuit 12, the logic circuit 13 and it is described drive
Dynamic protection circuit 14 is powered.
The operation principle of above-mentioned three-phase alternating voltage phase sequence monitoring system is as follows：
In the case of phase sequence is correct：
As shown in Fig. 2 if the phase sequence of three-phase alternating voltage is correct, the phase difference of three-phase alternating voltage is 120 °, and institute
State 120 ° of the phase of the first cross streams voltage L1 described in the second cross streams voltage L2 delayed phase, the third phase alternating voltage
Second cross streams voltage L2 120 ° of phase described in L3 delayed phase, described in the delayed phase of the first cross streams voltage L1
120 ° of third phase alternating voltage L3 phase.As shown in fig. 7, after the decompression filtering shaping circuit 11, each phase signals
Amplitude is reduced, and it is positive half period waveform only to retain amplitude.The reference voltage Vref is set as 0~V3, such as Fig. 2 institutes
Show, wherein V3 is the absolute value of three-phase alternating voltage crosspoint amplitude.As shown in figure 8, the low level pulsewidth of each comparative result
As three-phase alternating voltage amplitude is more than the cycle of the reference voltage, when the reference voltage Vref sets V3, does not consider
The low level of delay then each comparative result arrives successively, 1/3 cycle is respectively accounted for, due to the reference voltage in the present embodiment
Vref is between 0~V3, therefore, and low level pulsewidth can produce mutual covering, in the absence of simultaneously for high level situation, because
This, the set end SET of the d type flip flop 131 remains 0, does not work.As shown in figure 4, simultaneously, the d type flip flop 131
Reset terminal RST ground connection, remain 0, do not work；Therefore, the normal work of d type flip flop 131, in the upper of clock signal
Rise along one data-signal of triggering, because in the present embodiment, the first comparative result C1 is as clock signal, described second
Comparative result C2 as shown in Figure 8, compares knot as data-signal in the rising edge of the first comparative result C1, described second
Fruit C2 is low level signal, therefore described judges signal Q for low level.The Drive Protecting Circuit 14 is in the low level signal
The lower output drive signal of effect exports the correct indication signal of phase sequence so that the excitation of the relay 15, is connected to institute
The indicator lamp for stating relay 15 is lighted, subsequent conditioning circuit normal work.
In the case that phase sequence is disorderly：
If the phase sequence of three-phase alternating voltage is disorderly, the second cross streams described in the delayed phase of the first cross streams voltage L1
120 ° of voltage L2 phase, the first cross streams voltage L1 phase described in the delayed phase of the third phase alternating voltage L3
120 °, third phase alternating voltage L3 120 ° of phase described in the delayed phase of the second cross streams voltage L2, by the drop
After press filtration wave shaping circuit 11, each phase signals are as shown in Figure 9；After the comparison circuit 12, each comparative result such as Figure 10 institutes
Show, because the reference voltage Vref in the present embodiment is between 0~V3, therefore, low level pulsewidth can be produced mutually
Covering, in the absence of situation simultaneously for high level, therefore, the set end SET of the d type flip flop 131 remains 0, does not rise
Effect.As shown in figure 4, simultaneously, the reset terminal RST ground connection of the d type flip flop 131 remains 0, not worked；Therefore, the D
The normal work of trigger 131, a data-signal is triggered in the rising edge of clock signal, due in the present embodiment, and described the
One comparative result C1 is as clock signal, and the second comparative result C2 is as data-signal, as shown in Figure 10, described first
Comparative result C1 rising edge, the second comparative result C2 is high level signal, therefore described judges signal Q for high level.
The Drive Protecting Circuit 14 in the presence of the high level signal output drive signal so that the demagnetization of the relay 15, and then
The alarm indication signal is exported, the indicator lamp for being connected to the relay 15 extinguishes, and subsequent conditioning circuit can not normal work.
In the case that other phase sequences are disorderly, the logic circuit 13 exports high level, and the final relay 15 is exported
The alarm indication signal, subsequent conditioning circuit can not normal work, its operation principle and the second cross streams voltage are ahead of institute
The situation for stating the first cross streams voltage is consistent, does not repeat one by one herein.
The situation of phase shortage：
Lack the first cross streams voltage：In actual use, when a certain cross streams voltage is lacked, other two cross streams
The phase difference of voltage can become big, after decompression, filtering, shaping and comparison, each comparative result waveform such as Figure 11 institutes of output
Show, wherein the first comparative result C1 is always high level signal, then the clock end CK of the d type flip flop 131 is not triggered
Signal.During when each comparative result to be high level, the set end RST of the d type flip flop 131 works, and exports high level；When each
When comparative result is not all high level, export constant.Therefore the output signal of the d type flip flop 131 is always high level, described
Relay 15 exports the alarm indication signal.
Lack the second cross streams voltage：After decompression, filtering, shaping and comparison, each comparative result ripple of output
Shape is as shown in figure 12, wherein the second comparative result C2 is always high level signal, then it is high level in each comparative result
When, the logic circuit 13 exports high level signal；When each comparative result is not high level, the first comparative result C1
Rising edge, the second comparative result C2 be high level, therefore, the logic circuit 13 still exports high level.Final institute
State relay 15 and export the alarm indication signal.
Lack the third phase alternating voltage：After decompression, filtering, shaping and comparison, each comparative result ripple of output
Shape is as shown in figure 13, wherein the 3rd comparative result C3 is always high level signal, then it is high level in each comparative result
When, the logic circuit 13 exports high level signal；When each comparative result is not high level, the first comparative result C1
Rising edge, the second comparative result C2 be high level, therefore, the logic circuit 13 still exports high level.Final institute
State relay 15 and export the alarm indication signal.
The three-phase alternating voltage phase sequence monitoring system of the present invention is detected by the phase sequence to three-phase alternating voltage, with this
Relay is driven, and then protects the safety of electrical equipment, the disorderly unnecessary damage brought with phase shortage problem of phase sequence is prevented effectively from
Lose；Simultaneously because the three-phase alternating voltage phase sequence monitoring system of the present invention is integrated in the circuit module of chip, small volume, operation
Convenient, accuracy of detection is high.
In summary, the present invention provides a kind of three-phase alternating voltage phase sequence monitoring system, including：It is depressured filter shape electricity
Road；It will be made comparisons respectively with a reference voltage by the three-phase alternating voltage of the decompression filtering shaping circuit processing and export three
The comparison circuit of road comparative result；The phase sequence of three-phase alternating voltage is entered according to the three road comparative results that the comparison circuit is exported
Row detects and exports the logic circuit of a judgement signal；Judge that signal drives the drive of relay according to what the logic circuit was exported
Dynamic protection circuit；And indication signal is produced according to the output signal of the Drive Protecting Circuit, when the phase of three-phase alternating voltage
Phase sequence correct indication signal is exported when sequence is correct；Police instruction is exported when the phase sequence of three-phase alternating voltage is disorderly or phase shortage occurs
The relay of signal.The three-phase alternating voltage phase sequence monitoring system of the present invention is examined by the phase sequence to three-phase alternating voltage
Survey, relay driven with this, and then protect the safety of electrical equipment, be prevented effectively from that phase sequence is disorderly and phase shortage problem is brought need not
The loss wanted；Simultaneously because the three-phase alternating voltage phase sequence monitoring system of the present invention is integrated in the circuit module of chip, volume
Small, easy to operate, accuracy of detection is high.So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial
Value.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (6)
1. a kind of three-phase alternating voltage phase sequence monitoring system, it is characterised in that the three-phase alternating voltage phase sequence monitoring system is extremely
Include less：
It is depressured filtering shaping circuit, comparison circuit, logic circuit, Drive Protecting Circuit and relay；
The decompression filtering shaping circuit receives three-phase alternating voltage, and three-phase alternating voltage includes the first cross streams voltage, second
Cross streams voltage and third phase alternating voltage, the first cross streams voltage described in the delayed phase of the second cross streams voltage
120 °, 120 ° of the second cross streams voltage described in the delayed phase of the third phase alternating voltage, the first cross streams voltage
120 ° of third phase alternating voltage described in delayed phase, the decompression filtering shaping circuit drops respectively to three-phase alternating voltage
Pressure, filtering and Shape correction；
The comparison circuit is connected with the decompression filter shape module, by three by the decompression filtering shaping circuit processing
Cross streams voltage is made comparisons with a reference voltage and exports three road comparative results respectively；
The logic circuit is connected with the comparison circuit, and the three road comparative results exported according to the comparison circuit are intersecting to three
The phase sequence of stream voltage is detected, and output one judges signal；The logic circuit includes d type flip flop, three-phase alternating voltage institute
Corresponding three road comparative result is right by being connected to the set end of the d type flip flop, the first cross streams voltage institute with computing
The first comparative result answered is connected to the clock end of the d type flip flop, and the second cross streams voltage corresponding second compares knot
Fruit is connected to the data input pin of the d type flip flop, the reset terminal ground connection of the D triggerings；
The Drive Protecting Circuit is connected with the logic circuit, according to the judgement signal driving that the logic circuit is exported
Relay；
The relay produces indication signal according to the output signal of the Drive Protecting Circuit, when the phase sequence of three-phase alternating voltage
Phase sequence correct indication signal is exported when correct；The output police instruction letter when the phase sequence of three-phase alternating voltage is disorderly or phase shortage occurs
Number.
2. three-phase alternating voltage phase sequence monitoring system according to claim 1, it is characterised in that：The comparison circuit includes
3 comparators, the three-phase alternating voltage by the decompression filtering shaping circuit processing is connected to the anti-phase of each comparator
Input, the normal phase input end of each comparator connects the reference voltage.
3. three-phase alternating voltage phase sequence monitoring system according to claim 2, it is characterised in that：The reference voltage is not small
In zero and the no more than absolute value of three-phase alternating voltage crosspoint amplitude.
4. three-phase alternating voltage phase sequence monitoring system according to claim 1, it is characterised in that：Also include power circuit,
The power circuit receives three-phase alternating voltage, produces DC voltage and thinks that the three-phase alternating voltage phase sequence monitoring system is supplied
Electricity.
5. three-phase alternating voltage phase sequence monitoring system according to claim 4, it is characterised in that：The power circuit is resistance
Hold reduction voltage circuit, including three phase full wave rectification unit, capacitor filtering unit, one-level voltage regulation unit, partial pressure unit and two grades are surely
Press unit.
6. three-phase alternating voltage phase sequence monitoring system according to claim 1, it is characterised in that：It is also described including being connected to
The signal lamp of relay, when the relay output phase sequence correct indication signal, the indicator lamp is lighted；Work as institute
State relay and export the indicator lamp extinguishing during alarm indication signal.
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| CN201510906396.0A CN105356416B (en) | 2015-12-09 | 2015-12-09 | A kind of three-phase alternating voltage phase sequence monitoring system |
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| CN201510906396.0A CN105356416B (en) | 2015-12-09 | 2015-12-09 | A kind of three-phase alternating voltage phase sequence monitoring system |
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| CN106026030B (en) * | 2016-05-13 | 2018-12-04 | 南京铁道职业技术学院 | A kind of towed elevator phase order of 3-phase AC protector and guard method |
| CN106546830B (en) * | 2016-10-27 | 2019-09-10 | 北京机械设备研究所 | A kind of N phase voltage phase shortage and negative phase sequence detection method |
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| CN109270317A (en) * | 2018-11-08 | 2019-01-25 | 国网江苏省电力有限公司南通供电分公司 | A kind of multifunction power measuring instrumentss |
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