CN106546830B - A kind of N phase voltage phase shortage and negative phase sequence detection method - Google Patents
A kind of N phase voltage phase shortage and negative phase sequence detection method Download PDFInfo
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- CN106546830B CN106546830B CN201610959203.2A CN201610959203A CN106546830B CN 106546830 B CN106546830 B CN 106546830B CN 201610959203 A CN201610959203 A CN 201610959203A CN 106546830 B CN106546830 B CN 106546830B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
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Abstract
The present invention relates to the detection methods of a kind of N phase voltage phase shortage and anti-phase, comprising steps of N phase alternating current pressure, which is carried out conditioning, acquires the preferable N phase square-wave pulse signal of edge characteristics；N phase square-wave pulse signal is subjected to pile defection；N phase square-wave pulse signal is subjected to negative phase sequence detection；Result be will test compared with reference result under normal circumstances, obtain test result.The above method has the advantages that logic judgment is simple, component is less, utilize logic algebra analysis, abbreviation, designed lines, it realizes phase shortage and negative phase sequence detects, low-power consumption, strong anti-interference performance, arithmetic speed are fast, it is high to export conformability, it reduces costs simultaneously, does not need all to carry out analog-digital conversion acquisition to N phase voltage, do not need complicated software algorithm.
Description
Technical field
The present invention relates to phase shortage or negative phase sequence detection technique field more particularly to a kind of N phase voltage phase shortages and negative phase sequence to examine
Survey method.
Background technique
During diesel generating set operation or simultaneously machine, if there are phase shortage, diesel generating set startings for ployphase voltages
After can cause heating and cause thermal damage.It is huge between voltage if ployphase voltages phase sequence is different when more diesel generating set parallel connection
The big circulation and mechanical shock that potential difference generates will seriously endanger diesel generating set safety.
Common Phase sequence detection or control logic are complicated, and excessive gate circuit is needed to carry out logic judgment；Pass through
The analog-digital conversion function of microprocessor is all acquired the ployphase voltages value after conditioning, then is calculated by complicated software
Method obtains phase shortage or negative phase sequence conclusion, not only costly and complex.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of N phase voltage phase shortage and negative phase sequence detection method, to solve
Problems of the prior art.
The purpose of the present invention is mainly achieved through the following technical solutions:
Based in one embodiment of the present of invention, providing a kind of N phase voltage phase shortage and negative phase sequence detection method, N are
>=2 positive integer, comprising steps of
S101, by N phase alternating current pressure carry out conditioning acquire the preferable N phase square-wave pulse signal of edge characteristics；
S102, N phase square-wave pulse signal is subjected to pile defection；
S103, N phase square-wave pulse signal is subjected to negative phase sequence detection；
S104, it will test result compared with reference result under normal circumstances, obtain test result.
Based in another embodiment of the invention, N phase voltage is specially three-phase voltage.
Based in another embodiment of the invention, step S101 is specifically included:
By generating set output three-phase alternating voltage by mutual electromagnetic inductance device obtain three-phase alternating voltage UA, UB,
UC；The output end of UA, UB, UC are taken over to the inverting input terminal of zero comparator, obtain three-phase square wave pulse signal；By three-phase square wave
Pulse signal is sent into the NOT gate for having Schmitt trigger behavior to input and carries out shaping, the three-phase square wave pulse signal after obtaining shaping
FA、FB、FC。
Based in another embodiment of the invention, step S102 is specifically included:
Using three-phase square wave pulse signal FB, FC, FA as the clock signal of d type flip flop, pass through d type flip flop N respectively1、N2With
N3Judged, N1、N2And N3As a result it is respectively FA ', FB ', FC ', FA ', FB ', FC ' is sent into three input nand gates and patrolled
Judgement is collected, output result Y is pile defection result.
Based in another embodiment of the invention, step S103 is specifically included:
Using two pulse signals any in A, B, C phase as the input of d type flip flop, the preceding pulse signal conduct of phase
The clock signal of d type flip flop passes through d type flip flop N4Judged, output result Z is negative phase sequence testing result.
Based in another embodiment of the invention, step S103 is specifically included:
Using A phase pulse signal FA and B phase pulse signal FB as d type flip flop N4Input, clock of the FA as d type flip flop
Signal is judged that output result Z is negative phase sequence testing result by d type flip flop N4.
Based in another embodiment of the invention, step S104 is specifically included:
Under normal circumstances, FA ', FB ', FC ' are high level, and Y, Z are low level；
When the three-phase alternating voltage A phase phase shortage of generating set output, FA ' becomes low level, pile defection from high level
As a result Y becomes high level from low level；When B phase phase shortage, FB ' becomes low level from high level, and pile defection result Y is by low electricity
It is flat to become high level；When C phase phase shortage, FC ' becomes low level from high level, and pile defection result Y becomes high electricity from low level
It is flat；
When the three-phase alternating voltage negative phase sequence of generating set output, negative phase sequence testing result Z becomes high electricity from low level
It is flat.
Based in another embodiment of the invention, it will test result and reference result under normal circumstances be more specific
It is compared including waveform or level compares.
Based in another embodiment of the invention, further include, after obtaining test result, output according to testing result
Level change connects the warning device that can identify level change, to dangerous situation automatic alarm.
The present invention has the beneficial effect that:
N phase voltage phase shortage proposed by the present invention and negative phase sequence detection method, logic judgment is simple, component is less, utilizes
Logic algebra analysis, abbreviation, designed lines, realize phase shortage and negative phase sequence detects, low-power consumption, strong anti-interference performance, operation speed
Degree is fast, and output conformability is high, reduces costs simultaneously, does not need all to carry out analog-digital conversion acquisition to N phase voltage, no
Need complicated software algorithm.
Other features and advantages of the present invention will illustrate in the following description, also, partial become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by written explanation
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is three-phase alternating voltage conditioning circuit schematic diagram；
Fig. 2 is three-phase square wave pulse signal detection circuit schematic diagram；
Fig. 3 is the impulse waveform schematic diagram of normal condition；
Impulse waveform schematic diagram when Fig. 4 is phase shortage；
Impulse waveform schematic diagram when Fig. 5 is negative phase sequence.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention.
A specific embodiment according to the present invention discloses a kind of N phase voltage phase shortage and negative phase sequence detection method, packet
It includes:
S101, by N phase alternating current pressure carry out conditioning acquire the preferable N phase square-wave pulse signal of edge characteristics；
It specifically includes:
The N phase alternating voltage of generating set output is obtained into N phase alternating voltage by mutual electromagnetic inductance device；By the N
The output end of phase alternating voltage takes over the inverting input terminal of zero comparator respectively, obtains N phase square-wave pulse signal；By N phase square wave
The NOT gate that pulse signal is respectively fed to Schmitt trigger behavior input carries out shaping, obtains the preferable phase side N of edge characteristics
Wave pulse signal.
S102, N phase square-wave pulse signal is subjected to pile defection；
It specifically includes:
By the adjacent any two conducts d type flip flop N of phase in N phase square-wave pulse signal1-NnInput, every two Xiang Zhongxiang
Clock signal of the preceding square-wave pulse signal in position as corresponding d type flip flop, is judged by d type flip flop respectively, will be defeated
Result is sent into N input nand gate and carries out logic judgment out, and output result is pile defection result；
S103, N phase square-wave pulse signal is subjected to negative phase sequence detection；
It specifically includes:
D type flip flop N is used as by arbitrary neighborhood two in N phase square-wave pulse signaln+1Input, phase preceding pulse letter
Clock signal number as d type flip flop, is judged by d type flip flop, and output result is negative phase sequence testing result.
S104, it will test result compared with reference result under normal circumstances, obtain test result,
Pile defection result and negative phase sequence testing result are all low level in reference result under normal circumstances, when detection is tied
Pile defection result level, which changes, in fruit illustrates N phase voltage phase shortage, when negative phase sequence testing result becomes high level, explanation
N phase voltage negative phase sequence.
In another specific embodiment of the invention, N phase voltage is three-phase voltage, phase shortage and negative phase sequence detection method tool
Body includes:
S201, three-phase alternating voltage is carried out conditioning obtain the preferable three-phase square wave pulse signal FA, FB of edge characteristics,
FC, circuit diagram are as shown in Fig. 1:
It specifically includes: the three-phase alternating voltage of generating set output is obtained into three-phase alternation electricity by mutual electromagnetic inductance device
Press UA, UB, UC；The output end of UA, UB, UC are taken over to the inverting input terminal of zero comparator, obtain three-phase square wave pulse signal；It will
Three-phase square wave pulse signal is sent into the NOT gate for having Schmitt trigger behavior to input and carries out shaping, obtains edge characteristics preferable three
Phase square-wave pulse signal FA, FB, FC.Voltage Peak-peak ranges of UA, UB, UC are within zero-crossing comparator input range.
The preferable square-wave pulse signal of edge characteristics can be triggered effectively, be prevented when as d type flip flop input signal
False triggering or repeated trigger.
S202, three-phase square wave pulse signal FA, FB, FC are subjected to pile defection, circuit diagram is as shown in Fig. 2.
It specifically includes:
Using three-phase square wave pulse signal FB, FC, FA as the clock signal of d type flip flop, pass through d type flip flop N respectively1、N2With
N3Judged, N1、N2And N3As a result it is respectively FA ', FB ', FC ', FA ', FB ', FC ' is sent into three input nand gates and patrolled
Judgement is collected, output result Y is pile defection result.
S203, three-phase square wave pulse signal FA, FB, FC are subjected to negative phase sequence detection.
It specifically includes:
Using two pulse signals any in A, B, C phase as the input of d type flip flop, the preceding pulse signal conduct of phase
The clock signal of d type flip flop passes through d type flip flop N4Judged, output result Z is negative phase sequence testing result.
For example, as shown in Fig. 2, using A phase pulse signal FA and B phase pulse signal FB as d type flip flop N4Input, FA
As the clock signal of d type flip flop, pass through d type flip flop N4Judged, output result Z is negative phase sequence testing result.
It equally can also be using FB, FC as d type flip flop N4Input, FB is as d type flip flop N4Clock signal, touched by D
Send out device N4Judged, output result Z is negative phase sequence testing result；Or using FC, FA as d type flip flop N4Input, FC conduct
The clock signal of d type flip flop N4 passes through d type flip flop N4Judged, output result Z is negative phase sequence testing result.
S204, it will test result compared with reference result under normal circumstances, obtain test result.
In the normal situation of generating set, three-phase square wave pulse signal FA, FB, FC waveform, d type flip flop result FA ',
FB ', FC ' waveform, testing result Y, Z waveform are as shown in Fig. 3.Under normal circumstances, B phase pulse signal FB is as d type flip flop N1
Clock signal, when FB rising edge, FA is high level, N1Output FA ' is high level；Home pulse signal FC is as d type flip flop N2
Clock signal, when FC rising edge, FB is high level, N2Output FB ' is high level；A phase pulse signal FA is as d type flip flop N3
Clock signal, when FA rising edge, FC is high level, N3Output FC ' is high level；Three NAND gates input FA ', FB ', FC ' all
For high level, the pile defection Y of output is low level.
When normal work, A phase pulse signal FA and B phase pulse signal FB is as d type flip flop N4Input, FA as D touch
The clock signal for sending out device, when FA rising edge, FB is low level, N4The negative phase sequence testing result Z of output is low level.
When the three-phase alternating voltage A phase phase shortage of generating set output, three-phase square wave pulse signal FA, FB, FC waveform, D
Trigger result FA ', FB ', FC ' waveform, pile defection result Y waveform are as shown in Fig. 4.The waveform difference of FA ', FB ', FC '
For " low ", "high", " low ", the Y of the output of three NAND gates is high level.Equally, when B, C phase phase shortage, the Y of the output of three NAND gates
It is all high level.
It is three-phase square wave pulse signal FA, FB, FC waveform, inverse when the three-phase alternating voltage negative phase sequence of generating set output
Phase sequence detection result Z waveform is as shown in Fig. 5.A phase pulse signal FA is as d type flip flop N4Clock signal, when FA rising edge,
FB is high level, and the negative phase sequence testing result Z of N4 output is high level.
Specifically, manner of comparison includes that waveform compares or level the methods of compares.
Further, according to the level change of Y, Z, rear continued access can identify the warning device, indicator, instruction of level change
Lamp etc. or microprocessor etc. avoid the carelessness artificially observed or delay to dangerous situation automatic alarm.
It can be TTL integrated circuit for the digital circuit device in technical solution, be also possible to COMS integrated circuit.
In conclusion the embodiment of the invention provides a kind of N phase voltage phase shortage and negative phase sequence detection method, its advantages
It is that logic judgment is simple, component is less, using logic algebra analysis, abbreviation, designed lines, realizes phase shortage and negative phase sequence is examined
It surveys, low-power consumption, strong anti-interference performance, arithmetic speed is fast, and output conformability is high, reduces costs, is not needed to three-phase simultaneously
Voltage all carries out analog-digital conversion acquisition, does not need complicated software algorithm.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of N phase voltage phase shortage and negative phase sequence detection method, the positive integer that N is >=2, which is characterized in that comprising steps of
S101, the N phase alternating voltage of generating set output is obtained into N phase alternating voltage by mutual electromagnetic inductance device；By the N
The output end of phase alternating voltage takes over the inverting input terminal of zero comparator respectively, obtains N phase square-wave pulse signal；By N phase square wave
The NOT gate that pulse signal is respectively fed to Schmitt trigger behavior input carries out shaping, the N phase square-wave pulse after obtaining shaping
Signal；
S102, N phase square-wave pulse signal is subjected to pile defection；By adjacent any two of phase in N phase square-wave pulse signal
As d type flip flop N1-NnInput, the preceding square-wave pulse signal of phase is believed as the clock of corresponding d type flip flop in every two
Number, judged respectively by d type flip flop, output result is sent into N input nand gate and carries out logic judgment, output result is scarce
Phase testing result；
S103, N phase square-wave pulse signal is subjected to negative phase sequence detection；
S104, it will test result compared with reference result under normal circumstances, obtain test result.
2. a kind of N phase voltage phase shortage as described in claim 1 and negative phase sequence detection method, which is characterized in that the N phase voltage
Specially three-phase voltage.
3. a kind of N phase voltage phase shortage as claimed in claim 2 and negative phase sequence detection method, which is characterized in that step S101 tool
Body includes:
The three-phase alternating voltage of generating set output is obtained into three-phase alternating voltage UA, UB, UC by mutual electromagnetic inductance device；It will
The output end of UA, UB, UC take over the inverting input terminal of zero comparator, obtain three-phase square wave pulse signal；By three-phase square wave pulse
Signal is sent into the NOT gate for having Schmitt trigger behavior to input and carries out shaping, three-phase square wave pulse signal FA after obtaining shaping,
FB、FC。
4. a kind of N phase voltage phase shortage as claimed in claim 3 and negative phase sequence detection method, which is characterized in that step S102 tool
Body includes:
Using three-phase square wave pulse signal FB, FC, FA as the clock signal of d type flip flop, pass through d type flip flop N respectively1、N2And N3Into
Row judgement, N1、N2And N3As a result it is respectively FA ', FB ', FC ', FA ', FB ', FC ' is sent into three input nand gates progress logic and sentenced
Disconnected, output result Y is pile defection result.
5. a kind of N phase voltage phase shortage as claimed in claim 2 and negative phase sequence detection method, which is characterized in that step S103 tool
Body includes:
Using two pulse signals any in A, B, C phase as the input of d type flip flop, the preceding pulse signal of phase is touched as D
The clock signal for sending out device, passes through d type flip flop N4Judged, output result Z is negative phase sequence testing result.
6. a kind of N phase voltage phase shortage as claimed in claim 5 and negative phase sequence detection method, which is characterized in that step S103 tool
Body includes:
Using A phase pulse signal FA and B phase pulse signal FB as d type flip flop N4Input, clock signal of the FA as d type flip flop,
Judged by d type flip flop N4, output result Z is negative phase sequence testing result.
7. a kind of N phase voltage phase shortage as claimed in claim 4 and negative phase sequence detection method, which is characterized in that step S104 tool
Body includes:
Under normal circumstances, FA ', FB ', FC ' are high level, and Y, Z are low level；
When the three-phase alternating voltage A phase phase shortage of generating set output, FA ' becomes low level, pile defection result Y from high level
High level is become from low level；When B phase phase shortage, FB ' becomes low level from high level, and pile defection result Y is become by low level
For high level；When C phase phase shortage, FC ' becomes low level from high level, and pile defection result Y becomes high level from low level；
When the three-phase alternating voltage negative phase sequence of generating set output, negative phase sequence testing result Z becomes high level from low level.
8. a kind of N phase voltage phase shortage as described in claim 1 and negative phase sequence detection method, which is characterized in that described to will test
As a result with reference result under normal circumstances it is more specific include waveform compare or level compared with.
9. such as a kind of described in any item N phase voltage phase shortages of claim 1-8 and negative phase sequence detection method, which is characterized in that also
Including, after obtaining test result, output level according to testing result changes, the warning device that can identify level change is connect,
To dangerous situation automatic alarm.
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| CN107395159A (en) * | 2017-06-21 | 2017-11-24 | 北方电子研究院安徽有限公司 | A kind of three-phase square wave power supply |
| CN110161327A (en) * | 2019-06-04 | 2019-08-23 | 珠海格力电器股份有限公司 | A kind of detection device for phase sequence, permanent magnet synchronous motor and its phase sequence detecting method |
| CN116449122B (en) * | 2023-06-16 | 2023-08-18 | 创辉科技有限公司 | Fault detection circuit of power supply system |
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