CN207249005U - A kind of detection device of three-phase phase sequence - Google Patents
A kind of detection device of three-phase phase sequence Download PDFInfo
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- CN207249005U CN207249005U CN201721069015.9U CN201721069015U CN207249005U CN 207249005 U CN207249005 U CN 207249005U CN 201721069015 U CN201721069015 U CN 201721069015U CN 207249005 U CN207249005 U CN 207249005U
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Abstract
The utility model embodiment provides a kind of detection device of three-phase phase sequence.A kind of detection device of three-phase phase sequence, described device include signal comparator circuit, dsp chip, wherein：The signal comparator circuit is connected with three phase mains, for obtaining the three phase sine input signal of the three phase mains input, the three phase sine input signal is generated three square-wave signals and exports three square-wave signals to the dsp chip；The dsp chip is connected with the signal comparator circuit, for obtaining the pulse signal of three square-wave signals respectively and the phase sequence of the three phase sine input signal being determined according to the sequencing for the pulse signal for getting three square-wave signals.Using the utility model, the phase sequence of three-phase electricity can be accurately judged to, it is convenient and simple.
Description
Technical field
It the utility model is related to three-phase electrical domain, more particularly to a kind of detection method and device of three-phase phase sequence.
Background technology
Three-phase alternating current is a kind of transporting pattern of electric energy, and abbreviation three-phase electricity, three-phase electricity is by differing 120 ° on locus
Three coils at angle are rotated with identical speed to be produced, by the sinusoidal wave component of three 120 ° of differences in phase.The use of three-phase electricity
Way is very much, and most AC electric equipment is all powered using three-phase electricity in industry.Using the equipment of three-phase electricity to phase sequence
All require, must correctly be accessed according to phase sequence when accessing three-phase electricity just can work normally three-phase electric equipment.
In the prior art, the equipment for having phase sequence requirement relies primarily on phase-sequence detector to sentence to the phase sequence of three-phase electricity
It is disconnected, just allow operational outfit after ensureing correctly, need repeatedly access just to can determine that correct phase sequence in some cases, it is number
It is tired.
Utility model content
The utility model provides a kind of detection method and device of three-phase phase sequence, can be accurately judged to the phase of three-phase electricity
Sequence, it is convenient and simple.
The utility model embodiment provides a kind of detection device of three-phase phase sequence, and it is more electric that described device includes signal
Road, dsp chip, wherein：
The signal comparator circuit is connected with three phase mains, for obtaining the three phase sine input of the three phase mains input
Signal, generates three square-wave signals by the three phase sine input signal and exports three square-wave signals to the DSP
Chip；
The dsp chip is connected with the signal comparator circuit, for obtaining the pulse of three square-wave signals respectively
Signal simultaneously determines the three phase sine input signal according to the sequencing for the pulse signal for getting three square-wave signals
Phase sequence.
In a kind of possible design, the signal comparator circuit includes operational amplification circuit, comparison circuit, wherein：Institute
State first power supply of the operational amplification circuit respectively with the three phase mains, output preset voltage value to be connected, for obtaining described three
The three phase sine input signal of phase power input, the three phase sine input signal inputted with preset voltage value to the three phase mains
Boosting biasing is carried out, and the three phase sine input signal after boosting biases is exported to the comparison circuit；The comparison
Circuit is connected with the operational amplification circuit, the dsp chip respectively, for the three phase sine after boosting biases to be inputted
Three square-wave signals of signal generation simultaneously export three square-wave signals to the dsp chip.
In a kind of possible design, the operational amplification circuit includes three operational amplifiers, wherein：Three fortune
Calculate amplifier to be connected with the three phase mains, the comparison circuit respectively, for obtaining the three of the three phase mains input respectively
Three sinusoidal input signals of phase sinusoidal input signal, respectively rise three sinusoidal input signals with preset voltage value
Pressure biasing, and exported three sinusoidal input signals after boosting biasing are carried out respectively to the comparison circuit.
In a kind of possible design, the comparison circuit includes three comparators, wherein：Three comparators difference
It is connected with the operational amplification circuit, the dsp chip, for respectively by the three phase sine input signal after boosting biases
Three sinusoidal input signals generate three square-wave signals respectively and export three square-wave signals to the dsp chip.
In a kind of possible design, the signal comparator circuit further includes voltage follower circuit, wherein：The computing is put
Big circuit is connected by the voltage follower circuit with the comparison circuit.
In a kind of possible design, the signal comparator circuit further includes bleeder circuit, wherein：The three phase mains leads to
The bleeder circuit is crossed to be connected with the operational amplification circuit；The bleeder circuit is used for the three-phase for inputting the three phase mains
Sinusoidal input signal reduced output voltage is to the operational amplification circuit.
In a kind of possible design, the dsp chip includes three I/O mouthfuls, wherein：The signal comparator circuit difference
It is connected with described three I/O mouthfuls；The signal comparator circuit is defeated by three square-wave signals respectively by described three I/O mouthfuls
Enter to dsp chip.
In a kind of possible design, the dsp chip is specifically used for：By the arteries and veins of three square-wave signals got
The corresponding sinusoidal input signal of pulse signal for rushing first arrival in signal is determined as A phase sinusoidal input signals；It will get
Three square-wave signals pulse signal in second arrival the corresponding sinusoidal input signal of pulse signal be determined as B phases
Sinusoidal input signal；The pulse signal of 3rd arrival in the pulse signal of three square-wave signals got is corresponding
Sinusoidal input signal is determined as C phase sinusoidal input signals.
The utility model embodiment is converted into three square waves by the three phase sine input signal for inputting three phase mains and believes
Number, obtain the pulse signal of three square-wave signals and according to the priority for the pulse signal for getting three square-wave signals
Order determines the phase sequence of the three phase sine input signal, solves the equipment for having phase sequence requirement in conventional method and relies primarily on phase
Sequence detector judges the phase sequence of three-phase electricity, ensure it is correct after just allow operational outfit, need in some cases more
The problem of secondary access just can determine that correct phase sequence.Compared with conventional method, the method that the utility model embodiment provides is more
It is accurate convenient.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the utility model,
For those of ordinary skill in the art, without creative efforts, can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is a kind of composition structure diagram of the detection device of three-phase phase sequence in the utility model embodiment；
Fig. 2 is that the composition structure of the signal comparator circuit of the detection device of the three-phase phase sequence of the utility model embodiment is shown
It is intended to；
Fig. 3 is the schematic diagram of LM2902 operation amplifier chips；
Fig. 4 is the circuit connection signal that operational amplification circuit is formed using operation amplifier chip of the utility model embodiment
Figure；
Fig. 5 is the schematic diagram of LM2901 comparable chips；
Fig. 6 is the circuit connection diagram that comparison circuit is formed using comparable chip of the utility model embodiment；
Fig. 7 is front and rear contrast of the three phase sine input signal in the utility model embodiment by signal comparator circuit
Figure.
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 described embodiment is only the utility model part of the embodiment, rather than whole realities
Apply example.Based on the embodiment in the utility model, those of ordinary skill in the art institute without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Referring first to Fig. 1, Fig. 1 is a kind of composition knot of the detection device of three-phase phase sequence in the utility model embodiment
Structure schematic diagram, wherein, described device can be an independent detection device, or using one in the equipment of three-phase electricity
A detection module, as shown in the figure described device include at least signal comparator circuit 210, dsp chip 220, wherein：
The signal comparator circuit 210 is connected with three phase mains, for obtaining the three phase sine of the three phase mains input
Input signal, generates three square-wave signals by the three phase sine input signal and exports three square-wave signals to described
Dsp chip 220；
The dsp chip 220 is connected with the signal comparator circuit 210, for obtaining three square-wave signals respectively
Pulse signal and determine that the three phase sine is defeated according to the sequencing of the pulse signal that gets three square-wave signals
Enter the phase sequence of signal.
Wherein, the three phase sine input signal includes the sinusoidal input signal that three phase differences are 120 °.
In an alternative embodiment, described device can also include on-off circuit 230, wherein：
The signal comparator circuit 210 is connected by the on-off circuit 230 with the three phase mains, the on-off circuit
230 break-make for controlling the three phase sine input signal.
Specifically, for example described on-off circuit 230 can be always maintained at off-state, when receiving " beating for dsp chip 220
Open instruction " when open, can so ensure that three sinusoidal input signals of the three phase sine input signal are simultaneously emitted by.
Optionally, as shown in Fig. 2, the signal comparator circuit 210 can include operational amplification circuit 211, comparison circuit
212, wherein：
First power supply of the operational amplification circuit 211 respectively with the three phase mains, output preset voltage value is connected, and is used
In the three phase sine input signal for obtaining the three phase mains input, the three-phase inputted with preset voltage value to the three phase mains
Sinusoidal input signal carries out boosting biasing, and the three phase sine input signal after boosting biases is exported electric to the comparison
Road 212；
The comparison circuit 212 is connected with the operational amplification circuit 211, the dsp chip 220 respectively, for will be through
The three phase sine input signal crossed after boosting biasing generates three square-wave signals and exports three square-wave signals to described
Dsp chip 220.
Wherein, preset voltage value can be 1V, 2V, 3V etc., specifically can determine described first according to the actual conditions of circuit
The magnitude of voltage of power supply.
Optionally, the operational amplification circuit 211 can include three operational amplifiers, wherein：
Three operational amplifiers are connected with the three phase mains, the comparison circuit 212 respectively, for obtaining respectively
Three sinusoidal input signals of the three phase sine input signal of the three phase mains input, respectively with preset voltage value to described three
A sinusoidal input signal carries out boosting biasing, and is exported three sinusoidal input signals after boosting biasing are carried out respectively to described
Comparison circuit 212.
Optionally, the operational amplification circuit 211 can be made of integrated circuit and circuit element, such as similar to LM2902
The operation amplifier chip and resistance composition including at least three operational amplifier of chip；Can also be by multiple mutually independent fortune
Calculate amplifier and other circuit components form.
Wherein, the amplifying power of operational amplifier is by the capture ability of dsp chip and the voltage of three phase sine input signal
Scope determines that the capture ability of such as DSP is [0,3V], and three phase sine input signal is inputted to electric during the operational amplification circuit
It is [- 1.5V, 1.5V] to press scope, then amplifier amplifier need to possess the ability that the voltage of three-phase sinusoidal signal is raised to 1.5V.
Illustrate the composition and the course of work of operational amplification circuit by taking the operation amplifier chip of model LM2902 as an example below.
For the pinouts of LM2902 operation amplifier chips as shown in figure 3, LM2902 operation amplifier chips share 14 pins, pin 4 is electricity
Pin is pressed, pin 11 is grounding pin, pin 1,2,3, pin 5,6,7, pin 8,9,10 and pin 12,13,14 group respectively
Into an operational amplifier, totally 4 operational amplifiers, in the utility model, operation amplifier chip is used for preset voltage value
Boosting biasing is carried out to the three phase sine input signal of three phase mains input, then needs to choose three in operation amplifier chip
A operational amplifier is used as adder, and circuit connection diagram such as Fig. 4 institutes of operational amplification circuit are formed using LM2902 chips
Show, in Fig. 4, select pin 5,6,7, the operational amplifier conduct of pin 9,10,11 and pin 12,13,14 forms adder
Operational amplifier, then positive input pin 5,10,12 pass through three connecting lines of 3 resistance Ra and three phase mains respectively and connect
Connect, three sinusoidal input signals of the three phase sine input signal for obtaining three phase mains input respectively, meanwhile, forward direction input
Pin 5,10,12 accesses 1.5V voltages by 3 resistance Rb respectively, for carrying out boosting biasing to three sinusoidal input signals；
Negative sense input pin 6,9,13 is respectively connected to output pin 7,8,14 by 3 resistance Rb respectively；Meanwhile negative sense input pin
6th, 9,13 it is grounded respectively by 3 resistance Ra, output pin 7,8,14 is respectively connected to comparison circuit, according to empty short and empty conclude
Reason understands U7=U5+1.5V, U8=U10+1.5V, U14=U12+1.5V, and wherein U5, U8, U14 is respectively three phase sine input
Voltage when three sinusoidal signals of signal are exported to LM2902 chips, U7, U8, U7 are three sines after boosting biases
Voltage after signal.
Optionally, the positive input pin 5,10,12 can also access the power supply for possessing other magnitudes of voltage, be not limited only to
1.5V, such as can be 2V, 3V etc..
Using the operational amplification circuit shown in Fig. 4 three phase sine input signal can be made to raise 1.5V, for example, it is inclined by boosting
Three phase sine applied signal voltage scope before putting is [- 1.5V, 1.5V], then the three phase sine after boosting biases inputs letter
Number voltage range be [0,3V], i.e. operational amplifier makes the voltage of three phase sine input signal raise 1.5V.
Optionally, the comparison circuit 212 can include three comparators, wherein：
Three comparators are connected with the operational amplification circuit 211, the dsp chip 220 respectively, for respectively will
Three sinusoidal input signals of the three phase sine input signal after boosting biases generate three square-wave signals and by institute respectively
Three square-wave signals are stated to export to the dsp chip 220.
Optionally, three comparators are connected (i.e. described second electricity with exporting the second source of preset voltage value respectively
The numerical value for the voltage that source can provide is identical with the numerical value for the voltage that first power supply can provide).
Optionally, the comparison circuit can be made of integrated circuit and circuit element, such as be included similar to LM2901
The operation amplifier chip and resistance of at least three operational amplifier are formed；Can also be by multiple mutually independent comparators and other
Circuit components form.
Illustrate the course of work of comparison circuit with the comparable chip of model LM2901 below.The computing chip of LM2901
Pin relation can be with as shown in figure 5, LM2901 operational amplification circuits share 14 pins, pin 3 be voltage pin, and pin 12 is
Grounding pin, pin 2,4,5, pin 1,6,7, pin 8,9,14 and pin 10,11,13 separately constitute a comparator, and totally 4
A comparator, needs as follows using wherein three comparators, the treatment mechanism of comparator in the utility model：When comparator
When the voltage of positive input pin is higher than the voltage of negative sense input pin, output pin output high level signal；When comparator
The voltage of sinusoidal input signal is less than negative sense input pin when the voltage of positive input pin is less than the voltage of negative sense input pin
Voltage when, output pin output low level signal.The circuit connection diagram that comparison circuit is formed using LM2901 chips can
As indicated with 6, in Fig. 6, to select pin 1,6,7, the comparison as generation square wave of pin 8,9,14 and pin 10,11,13
Device, then positive input pin 7,9,11 be connected respectively with operational amplification circuit, the process exported for receiving operational amplification circuit
Three phase sine input signal after boosting biasing, at the same positive input pin 7,9,11 be connected to respectively by 3 resistance Rc it is defeated
Go out pin 1,13,14, negative sense input pin 6,8,10 accesses 1.5V voltages by 3 resistance Rd respectively.
Optionally, negative sense input pin 6,8,10 can also access the power supply for possessing other magnitudes of voltage, wherein, negative sense input
The magnitude of voltage that pin 6,8,10 accesses can be consistent with the magnitude of voltage for the power supply that operational amplification circuit accesses.
Specifically, effect as shown in Figure 7 can be produced using the comparison circuit shown in Fig. 6, wherein, figure A is input to Fig. 6
In positive input pin 7,9,11 when three phase sine input signal, figure B is comparator according to three phase sine input signal
The square-wave signal that voltage is exported compared with the voltage of negative sense input pin 6,8,10 by output pin 1,13,14.
Optionally, the signal comparator circuit 210 can also include voltage follower circuit 213, wherein：
The operational amplification circuit 211 is connected by the voltage follower circuit 213 with the comparison circuit 212.
Optionally, the voltage follower circuit can be integrated circuit, be, for example, that playing for similar LM2902 isolates work
Integrated circuit.
Optionally, the voltage follower circuit can include at least three voltage follower.
Three phase sine input signal after comparison circuit is changed into square-wave signal, can be to by transporting when square-wave signal is overturn
The three phase sine input signal for calculating amplifying circuit has an impact (such as can make three phase sine waveform input signal distortion etc.) and causes
Detection is inaccurate, and the voltage follower in voltage follower circuit can play the role of isolating two-stage circuit, make operational amplification circuit
It can be worked normally with the circuit of comparison circuit.
Optionally, the signal comparator circuit 210 can also include bleeder circuit 214, wherein：
The three phase mains is connected by the bleeder circuit 214 with the operational amplification circuit 211；
The bleeder circuit 214 is used for the three phase sine input signal reduced output voltage that the three phase mains inputs to described
Operational amplification circuit 211.
Optionally, the bleeder circuit can be made of multiple divider resistances, in the specific implementation, can be according to dsp chip
The ability of capture voltage and the magnitude of voltage of first power supply set and determine to need the voltage walked by divider resistance point.
For example, the ability of dsp chip capture voltage is [0,3V], the magnitude of voltage of the first power supply is 1.5V, then can draw
Voltage range when three phase sine input signal is exported to the computing chip is [- 1.5V, 1.5V], the three of three phase mains output
The initial voltage range of phase sinusoidal input signal is [- 220V, 220V], it is determined that need be by the voltage that divider resistance point is walked
202.5V。
Optionally, the dsp chip 220 includes at least three I/O mouthfuls, wherein:
The signal comparator circuit 210 is connected with described three I/O mouthfuls respectively；
Three square-wave signals are input to DSP cores by the signal comparator circuit 210 respectively by described three I/O mouthfuls
Piece 220.
In another alternative embodiment, above-mentioned signal comparator circuit can be by possessing the replacement of the integrated chip of said function.
The structure of the detection device of above-mentioned three-phase phase sequence can perform following steps：
First, signal comparator circuit obtains the three phase sine input signal of three phase mains input.
Wherein, the three phase sine input signal includes the sinusoidal input signal that three phase differences are 120 °.
Optionally, an on-off circuit can be set between the signal comparator circuit and the three phase mains, and made
The on-off circuit is always maintained at off-state, when needing to obtain the three phase sine input signal of the three phase mains input
The on-off circuit is opened, can ensure that three sines of the three phase sine input signal are defeated by way of on-off circuit is set
Entering signal can be simultaneously emitted by.
Optionally, described three can just be opened when needing and obtaining the three phase sine input signal of the three phase mains input
Phase power supply.
2nd, the three phase sine input signal is generated three square-wave signals by the signal comparator circuit.
Optionally, the signal comparator circuit can be respectively to three sinusoidal input letters of the three phase sine input signal
Number handled respectively, generate three square-wave signals.
Optionally, the signal comparator circuit can carry out processing life using comparator to the three phase sine input signal
Into three square-wave signals.
3rd, the signal comparator circuit exports three square-wave signals to dsp chip.
Optionally, the signal comparator circuit respectively can export the square-wave signal to the DSP (Digital
Signal Processing, Digital Signal Processing) chip I/O (Input/Output, input/output) mouth.
4th, the dsp chip obtains the pulse signal of three square-wave signals respectively.
Optionally, the pulse signal can be the decline of the rising edge signal or the square-wave signal of the square-wave signal
Along signal, it is necessary to which explanation, what the dsp chip obtained is the identical pulse signal of attribute, such as obtains described three respectively
The rising edge signal of a square-wave signal or the trailing edge signal for obtaining the square-wave signal respectively.
5th, the dsp chip is according to determining the sequencing for the pulse signal for getting three square-wave signals
The phase sequence of three phase sine input signal.
Specifically, what the dsp chip arrived first in the pulse signal of three square-wave signals got
The corresponding sinusoidal input signal of pulse signal is determined as A phase sinusoidal input signals；To get described three of the dsp chip
The corresponding sinusoidal input signal of pulse signal of second arrival is determined as the sinusoidal input letter of B phases in the pulse signal of square-wave signal
Number；The dsp chip corresponds to the pulse signal of the 3rd arrival in the pulse signal of three square-wave signals got
Sinusoidal input signal be determined as C phase sinusoidal input signals.
For example, phase sequence variable U1, U2, U3 can be set in the dsp chip, the program for obtaining pulse signal is performed, when
When getting first pulse signal, phase sequence variable U1 assignment a are given, when getting second pulse signal, give phase sequence variable
U2 assignment b, when getting the 3rd pulse signal, give phase sequence variable assignments c, after the completion of dsp chip acquisition, show phase sequence
The value of variable U1, U2, U3.
In the utility model embodiment, the three phase sine input signal that three phase mains inputs is converted into by signal comparator circuit
Three square-wave signals, dsp chip obtain the pulse signal of three square-wave signals and according to getting three sides respectively
The sequencing of the pulse signal of ripple signal determines the phase sequence of the three phase sine input signal, by get first pulse
The corresponding sinusoidal input signal of signal is determined as A phase sinusoidal input signals；Get second pulse signal is corresponding just
String input signal is determined as B phase sinusoidal input signals；Get the 3rd corresponding sinusoidal input signal of pulse signal is true
It is set to C phase sinusoidal input signals, one-time detection can accurately determine the phase sequence of three phase sine input signal, convenient and simple.
Above disclosed is only the utility model preferred embodiment, cannot limit the utility model with this certainly
Interest field, therefore equivalent variations made according to the utility model claims still belong to the scope that the utility model is covered.
Claims (8)
- A kind of 1. detection device of three-phase phase sequence, it is characterised in that described device includes signal comparator circuit, dsp chip, its In：The signal comparator circuit is connected with three phase mains, and the three phase sine for obtaining the three phase mains input inputs letter Number, the three phase sine input signal is generated into three square-wave signals and exports three square-wave signals to the DSP cores Piece；The dsp chip is connected with the signal comparator circuit, for obtaining the pulse signal of three square-wave signals respectively And the phase of the three phase sine input signal is determined according to the sequencing for the pulse signal for getting three square-wave signals Sequence.
- 2. device as claimed in claim 1, it is characterised in that the signal comparator circuit includes operational amplification circuit, compares Circuit, wherein：First power supply of the operational amplification circuit respectively with the three phase mains, output preset voltage value is connected, for obtaining The three phase sine input signal of the three phase mains input, it is defeated with the three phase sine that preset voltage value inputs the three phase mains Enter signal and carry out boosting biasing, and the three phase sine input signal after boosting biases is exported to the comparison circuit；The comparison circuit is connected with the operational amplification circuit, the dsp chip respectively, for by after boosting biases Three phase sine input signal generates three square-wave signals and exports three square-wave signals to the dsp chip.
- 3. device as claimed in claim 2, it is characterised in that the operational amplification circuit includes three operational amplifiers, its In：Three operational amplifiers are connected with the three phase mains, the comparison circuit respectively, for obtaining described three respectively Three sinusoidal input signals of the three phase sine input signal of phase power input, respectively with preset voltage value to three sines Input signal carries out boosting biasing, and will carry out three sinusoidal input signals after boosting biasing export respectively it is electric to the comparison Road.
- 4. device as claimed in claim 2, it is characterised in that the comparison circuit includes three comparators, wherein：Three comparators are connected with the operational amplification circuit, the dsp chip respectively, inclined for that will pass through boosting respectively Three sinusoidal input signals of the three phase sine input signal postponed generate three square-wave signals and by three square waves respectively Signal output is to the dsp chip.
- 5. such as claim 2-4 any one of them devices, it is characterised in that the signal comparator circuit further includes voltage follow Circuit, wherein：The operational amplification circuit is connected by the voltage follower circuit with the comparison circuit.
- 6. such as claim 2-4 any one of them devices, it is characterised in that the signal comparator circuit further includes partial pressure electricity Road, wherein：The three phase mains is connected by the bleeder circuit with the operational amplification circuit；The bleeder circuit is used to put three phase sine input signal reduced output voltage to the computing that the three phase mains inputs Big circuit.
- 7. device as claimed in claim 1, it is characterised in that the dsp chip includes three I/O mouthfuls, wherein：The signal comparator circuit is connected with described three I/O mouthfuls respectively；Three square-wave signals are input to dsp chip by the signal comparator circuit respectively by described three I/O mouthfuls.
- 8. device as claimed in claim 1, it is characterised in that the dsp chip is specifically used for：By the corresponding sinusoidal input of the pulse signal of first arrival in the pulse signal of three square-wave signals got Signal is determined as A phase sinusoidal input signals；By the corresponding sinusoidal input of the pulse signal of second arrival in the pulse signal of three square-wave signals got Signal is determined as B phase sinusoidal input signals；By the corresponding sinusoidal input of the pulse signal of the 3rd arrival in the pulse signal of three square-wave signals got Signal is determined as C phase sinusoidal input signals.
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| CN201721069015.9U CN207249005U (en) | 2017-08-24 | 2017-08-24 | A kind of detection device of three-phase phase sequence |
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| CN201721069015.9U CN207249005U (en) | 2017-08-24 | 2017-08-24 | A kind of detection device of three-phase phase sequence |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108351375A (en) * | 2017-08-24 | 2018-07-31 | 深圳欣锐科技股份有限公司 | A kind of detection method and device of three-phase phase sequence |
| CN110596475A (en) * | 2019-09-25 | 2019-12-20 | 东莞市华博精测仪表科技有限公司 | Measuring instrument with phase sequence testing function |
-
2017
- 2017-08-24 CN CN201721069015.9U patent/CN207249005U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108351375A (en) * | 2017-08-24 | 2018-07-31 | 深圳欣锐科技股份有限公司 | A kind of detection method and device of three-phase phase sequence |
| CN110596475A (en) * | 2019-09-25 | 2019-12-20 | 东莞市华博精测仪表科技有限公司 | Measuring instrument with phase sequence testing function |
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