CN1548978A - Online real-time detection method for variation of air gap magnetic field of generator - Google Patents
Online real-time detection method for variation of air gap magnetic field of generator Download PDFInfo
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Abstract
An on-line automatic detection method for monitoring generator air gap changes in real time. The present invention includes monitoring air gap data generated by a magnetic flux sensor in a generator. The invention allows on-line monitoring and display of measurements taken by the magnetic flux detectors at the air gap.
Description
Background technology
Because " turn-to-turn short circuit (short-turns) " that the puncture of insulator and migration cause between the rotor winding of generator is the example of validity with the phenomenon of stability of well-known reduction generating.Generator magnetic flux amount probe method is the method for this turn-to-turn short circuit of a kind of practicable detection in the time of early stage.In exploitation in 1970, this method was used to measure the variation of power generator air gap magnetic flux to generator magnetic flux amount probe method, the asymmetric existence that reflects rotor inter-turn short circuit of magnetic flux by D.R.Albright.Usually the be connected panel terminal of generator of magnetic-flux detector is used together, and waveform will be recorded and print then.Yet the use of magnetic flux detector measurement is labour-intensive on the mode that data are obtained and analyzed, and is easy to cause artificial mistake in this case.
The routine measurement of magnetic flux detector waveform is carried out according to trimestral timetable usually, because the generator amature turn-to-turn short circuit does not have significant symptom in early days, usually it will reveal as time goes by gradually, and little turn-to-turn short circuit is incited somebody to action growing as time goes by and become more serious.Like this, carry out the required manpower of rotor maintenance job, also using a kind of semi-automatic surveillance that is used for discerning rotor inter-turn short circuit earlier for the time and the saving that reduce system-down.This automatic system is used the IBM PC-AT compatible computer that user software and hardware have been installed.Use this system can show magnetic flux detection waveform, it also provides and has been used for data are saved as the application program of data-base content, thereby allows to reproduce original data to a certain extent.
The defective of this system is that it is manually-operated, needs artificial each waveform measurement value of gathering.The operator must be in the generator end image data, and, when in conventional system, detecting rotor inter-turn short circuit, can not provide switch fault report to the operator, turn-to-turn short circuit can only be discerned by maintainer at the scene.In addition, during preset time and beyond the conventional waveform measurement, just rotor inter-turn short circuit can not have been detected.
Summary of the invention
In brief, preferred form of the present invention is the combination of a software and hardware, and in order to discern rotor inter-turn short circuit in early days, it comprises uses the in-service monitoring system that magnetic flux is surveyed the method that waveform is measured.More specifically, this system has automatic detection and reports that any magnetic flux surveys the asymmetric characteristics of waveform, and in case detects abnormal conditions and can alarm is provided or carry out other operations to the staff.
This system is used for the ability with post analysis except having catching waveform under the condition of setting automatically, also comprises the ability of waveform being monitored in real time by such as computing machine Internet and/or Intranet.
Description of drawings
According to following detailed description and with reference to the accompanying drawings, those of ordinary skill in the art can be well understood to other purpose and advantage of the present invention, in these accompanying drawings:
Fig. 1 is an xsect and a waveform that 2 pole wheels of 8 grooves are arranged.
Fig. 2 shows the processing to waveform.
Fig. 3 shows the identification according to crest of the present invention and trough.
Fig. 4 be one according to program flow diagram of the present invention.
Fig. 5 is the process flow diagram and the table that show according to the various aspects of master routine of the present invention.
Fig. 6 shows the example that a monitor according to the present invention shows.
Fig. 7 shows the example of system according to an embodiment of the invention assembling
Fig. 8 is an example that the hardware that surveillance is combined with electricity generation system according to the present invention is installed.
Embodiment
Generator amature magnetic flux detector 10 well-known in the art normally one be installed in the distance field entity from approximately
3/
4Inch is to about 1
3/
4The sensor of this minimum distance between the inch.Magnetic flux detector 10 need be placed on the position of the axle of air gap usually, and is positioned on any possible position of non-magnetic field wedge.For the GE generating set of dispatching from the factory after nineteen ninety, permanent magnetic flux detector often has been installed in device fabrication.The function of magnetic flux detector 10 is that the magnetic density that allows to measure the stator air gap changes.The groove that focuses on rotor of the waveform that the magnetic flux detector generates and the magnetic density between the tooth change.The amplitude of tank voltage peak value is the function of the deviation that causes of effective turn (slot leakage flux) in the groove and the air gap flux density value of passing groove.The detection of turn-to-turn short circuit be by with slot wave shape with and the groove of its relative magnetic pole is compared and determine that the amplitude excursion between them obtains.
Fig. 1 shows the xsect of one 2 pole wheel, and its each magnetic pole has 8 grooves, can see this rotor in the generating plant usually.It is relevant with the quantity of pole surface and groove that Fig. 1 also shows the wave form that obtains from magnetic flux detector 10, magnetic pole A (8A-1A, A1-A8), magnetic pole B (B8-B1,1B-8B).Therefore, a complete circulation has 16 crests and 16 troughs altogether.
Fig. 2 A shows a typical magnetic flux detector waveform, the groove of crest and trough is numbered, Fig. 2 B shows typical waveform processing with the form of figure, by pole surface just in time the point of process lantern slide is cut, be denoted as line A in the drawings, subsequently left-half spun upside down and places it in the top of right half part and overlap on together up to the crest relevant with same groove.Fig. 2 C has shown the comparison of carrying out subsequently that can see, this relatively be by identification whether the amplitude of the crest method that distortion taken place and significantly be lower than the crest of relative magnetic pole carry out, if there is this situation, can determine that then this groove has one or more turn-to-turn short circuit.
Embodiments of the invention have used the waveform that produces from magnetic flux detector 10.The present invention comprises a computer based surveillance for instance, it has used for example LabView of National Instruments company, and National Instruments LabView is a graphical development environment that is used for making up data acquisition, instrument and control system.LabView has used friendly graphical user program, and wherein the user can create one the user interface that software systems are controlled alternately is provided.Having the system design that monitoring software and measurement hardware are combined closely makes the solution of quick development data collection and control, analysis and demonstration become very easy.Use has the software of the powerful build-in function that is used for Measurement and analysis and is used for the graphical compiler that performance is optimized is the desired feature of monitoring software, and it is with compatible mutually such as Windows 2000/NT/Me/9x, Mac OS, Linux, these operating systems of Sun System.
In an embodiment of the present invention, permanent the linking together of magnetic flux detector of surveillance and generator, so just handle solution is provided, thereby provide great improvement measuring reliability, correctness and objectivity for manual magnetic flux detector measurement.For example in Fig. 9,143 or 144 connectors that pass the top and bottom in generating plant, the dragon drum beach generator connect data and obtain input end and can be connected to the magnetic flux detector.The magnetic flux detector signal can be caught to allow input signal to be sent to data processing unit 16 by for example DAQ card 14 and be analyzed.Use software that these data that obtain are compared with the amplitude of relative magnetic pole corresponding groove with post-processing unit, can on computer display 20, show the analysis result information relevant then with other, with the situation of monitors rotor, and the generation of observation turn-to-turn short circuit.In case capture this data, waveform just can automatically save as file and analyze in the needs in the future being used for.System's monitoring image that can also allow to have the alarm indication is shown on the remote computer terminal in addition, such as being positioned on company's Intranet Anywhere.Because data can gather and analyze on computers, so these data also can be by obtaining such computer link to Internet.Under the situation about being widely used, Internet refers to link by transmission control protocol/Internet protocol (TCP/IP) between computing machine and the network.
In an embodiment of the present invention, the hardware interface of collection magnetic flux detector signal is a 6024E DAQ card.6024E DAQ card apparatus 14 is analog to digital converters, and when monitoring hardware uses, it reflects real-time performance in based on the development environment of Windows.6024E DAQ card is an example of the well-known equipment in present technique field, and it can be converted to the output that computing machine can be used with these inputs then from such as obtaining input the such equipment of magnetic flux detector.The user can use built-in DAQ card to create the real-time assembly of the desktop computer inside of the standard that is embedded in, and a high performance real-time system can be worked together with all flexible and powerful instruments in the surveillance, to create real-time measurement and analysis.
For example 6024E DAQ card is by connector and 8 digital I/O lines of 16 analog input channels (8 difference input channels), two analog output channels, 68 pins.The analog input of 8 magnetic flux detector waveforms is enough to all generators in the typical power house.
In case gathered data from the magnetic flux detector, will detect to crest in the data stream as shown in Figure 3 and trough.Can calculate the deviation of crest and trough subsequently, and can use alarming mechanism or other signal according to the parameter of data.What remember is, maximum crest and trough amplitude normally are detected near pole surface, and direct current offset makes the problem of detection some complexity a little that becomes.Therefore, as an example, after the signal that has obtained a period of time (approximately 20ms), at first minimum and maximum amplitude is assessed.In an embodiment of the present invention, if amplitude, exceeds peak swing greater than about 4.5V about more than 10% or the about voltage below 10% that is low to moderate minimum amplitude be used as the boundary voltage of crest and trough.The automatic crest detecting function of surveillance, LabView for example preferablyly discerns with interior execution crest on the crest border, discerns with interior execution trough on the trough border.For fear of wrong identification to crest, at first before first crest border of identification, last trough is discerned, first crest frontier probe always is used for first point that crest is surveyed like this.
At first calculate deviation between crest and the trough subsequently by calculating difference of vibration between first crest and first trough.Difference of vibration between first crest and first trough is divided by bigger one in the middle of first crest or the trough then.If waveform is symmetrical, between crest and trough, do not have difference so, remove the result be zero.This process repeats with interior crest and trough other 15 borders.Because the influence of air gap flux density, when the air gap flux density of passing transverse axis is zero, this will be more accurate relatively.
Well-known in the art be, magnetic flux detector waveform changes along with the change of load, but symmetry still keeps.When load variations suddenly having occurred, great variation has for example taken place in 20ms, its result perhaps is that a big crooked and asymmetric magnetic flux is surveyed waveform, it is asymmetric causing observed waveform.Yet the generation owing to the load variations of thinking in an embodiment of the present invention suddenly will can not continue for example can obtain the waveform in ten cycles altogether before determining whether that turn-to-turn short circuit has taken place.In ten waveform samplings of surpassing are arranged, detect under the situation of asymmetric waveform, surpassed default value, at this moment just can activate turn-to-turn short circuit alarm or other signal.
Have several other factors also can have influence on waveform, for example do not have load when generator, when being in the idle running situation, rotor-exciting is less or do not have, and wherein, the magnetic flux detector waveform of noting should have less amplitude and long cycle.Yet amplitude of wave form will increase when generator connects load, and the cycle will dwindle.Similar to the situation of load variations, any abrupt change under the generator duty all may cause observing the asymmetric of waveform.According to this point, method is to obtain magnetic flux detector waveform after the variation of generator takes place preferably.In an embodiment of the present invention, under the situation of amplitude of wave form at 3000rpm of crest, may be increased to, so data can only be at amplitude greater than approximately obtaining in the 4.5V (3000rpm) above about 4.5V at the crest between two magnetic poles.This example is illustrated in generator between Kai Heguan, change in, the modification that data are gathered allows to stop the activity of turn-to-turn short circuit alarm.Yet, higher if difference continues to keep, for example 10 or sampling above 10, shorted turns indicator will activate, and this indicator may be a lamp, a monitor screen element and/or a control signal.
In an embodiment of the present invention, if zero crossing line and waveform crest value are overlapping when generator loading increases, then Wave data can be preserved automatically.On this aspect, waveform has minimum interference.Therefore, at this moment the data of record will have tangible reference value when comparing with past and data in the future.In addition, in order to generate a kind of different data processing, can be created in the history of the turn-to-turn short circuit percent value of zero cross point.When waveform is automatically caught and data is saved as a data file, can also obtain other information, for example unit number, date and time information are beneficial to data analysis in the future.
Vicious the time, for instance, the DAQ error indicator of a redness will light, and can also send an alarm signal to control operation person in addition in the waveform that does not recognize crest or obtain from the magnetic flux detector.Can in Fig. 4, see the example of system flowchart, start data acquisition here, will not recognize crest and trough if make a mistake, this be can be manual be saved in the file.Calculate and show deviation and the deviation of deviation and setting is compared.This process can repeat in following period of time, with the possibility of the unacceptable deviation of eliminating reporting errors.Usually on the time frame that is provided with, catch 10 waveforms, and the deviation of these waveforms and setting is compared.Counter that can be cleared is used for determining the quantity of the waveform that captures.If deviation has dropped on outside the acceptable scope, may send one and alarm and it is recorded in the file.
In an embodiment of the present invention, as shown in Figure 5, the master routine that is used to monitor the magnetic flux detector for example flux probe.vi has at least 3 cover subroutines in work.The first cover subroutine for example deviation.vi is calculated difference of vibration between crest and the trough; The second cover subroutine for example peakrecognition.vi is discerned useful crest and trough from original waveform; Last cover subroutine is the ascii text file of write to file with header.vi output time and amplitude, crest and trough information for example; In program is under the situation of flux probe.vi, and the file of all generations all uses extension name .xls to store.
Embodiments of the invention have used a graphic user interface, and as shown in Figure 6, this interface may be for example printer and/or computer monitor.Especially, the interface information below master routine in the example of flux probe.vi and graphic user interface generate:
1, real-time magnetic flux detector measurement.
2, useful crest and trough are highlighted sign.
3, selectable sampling rate.
4, selectable and acceptable amplitude excursion.
5, peak swing deviation that measures and corresponding groove number.
6, detected crest and trough quantity.
7,16 crests and trough amplitude excursion.
8, passage (be under monitoring generator unit number).
9, red DAQ input error is indicated.
10, red turn-to-turn short circuit is indicated.
One embodiment of the present of invention can dispose and be installed as has the ability that the user can revise the mode of image data in the magnetic flux detector.This ability allows user its correctness of expansion and accuracy on the basis of the data of gathering.For example data sampling rate can followingly be provided with:
The cycle of low frequency component: 20ms
From the surface of a magnetic pole to the time of relative magnetic pole: 10ms
The groove of each magnetic pole: 8
Groove from a magnetic pole to relative magnetic pole process: 16
The averaging time of each groove (high frequency period): 10ms/16=625 μ s
The minimum sampling period: 625 μ s
Minimum sampling rate: p.s. (312.5 μ s)
-1=3200 sample values
In order to have acceptable time resolution, sampling rate＞=5*3200sps=16ksps.
Resolution in the embodiments of the invention and program response time can be provided with, and for example are set to the resolution of 8 bits.In a such measurement, maximum error is 1/ (2
8-1)=0.392%, this is more much smaller than the vision deviation that can see in traditional data acquisition practice.Because the response time is not very important, so 1 to 2 second maximum response time should be acceptable.
Realize that the surveillance shown in Fig. 7 relates to consideration based on the system requirements such as generator quantity, data acquisition request and these factors of algorithm complex.Need to determine appropriate software platform, for example a LabView then.Also data acquisition interface to be connected on the generator practically.For example, if use National Instrument DAQ card 6024E as analog to digital converter, maximum can connect 4 generator magnetic flux amount detectors.For example between DAQ card and magnetic flux detector, can connect by a BNC cable.As well-known in the art, it should be understood that any equipment that is used for transmitting such signal all is operable.Go up for therein one analog to digital converter is installed, as shown in Figure 9, for example in generating plant, dragon drum beach generator, the data that converter passes 143 or 144 connectors of top and bottom by connection are obtained input end and are connected on the generator panel, the computing machine that is used for gathering digital signal is the Celeron desktop computer, and it is suitable for as actual measurement.
Because the magnetic flux detector waveform of different types of generator has its oneself waveform character, can be by the modification of software program being revised crest/valley detection method.Usually according to this correction, need the reliability of a workout period after program made amendment with test macro.
The target of having used the execution of monitoring software in the embodiment of the invention of LabView software and hardware to consider comprises:
1, monitors constantly and analyze.
2, target, rule-based wave form analysis are arranged.
3, telemonitoring.
4, monitor nearly 4 generators simultaneously.
5, when taking place, turn-to-turn short circuit reacts at once.
6, provide local and remote alarm to export to remind the operator.
7, when taking place, turn-to-turn short circuit automatically waveform is saved as file.
8, the wave file of output seizure is to analyze.
9, cost efficiency height and installation are simple.
10, user-friendly LabView background.
11, by company's Intranet in-service monitoring.
Software and hardware is in an embodiment of the present invention installed and is comprised:
Following software is installed in computing machine:
LabView fully/specialize in system
LabView real time execution engine
Subsequent data obtains the installation of hardware can together carry out with the installation of measurement and robotization browser, and this browser can find obtaining among the CD-ROM that hardware together sends with data usually.In addition,, should carry out executable program, perhaps under the situation that the real time execution engine only has been installed, move executable file in the place that source file can move if development system has been installed.
Used LabView in an embodiment of the present invention, image data, explanation results, output data file and termination routine are finished by following described step:
Image data from wave file:
1, select File from the sources of waveforms file
2, select the waveform text of any following form
Time?1，<tab>Amplitude?1<CR>
Time?2，<tab>Amplitude?1<CR>
Here＜CR〉corresponding to ASCII character 13,＜tab〉corresponding to sign indicating number 9, wave file is directed in the system subsequently.
From the DAQ card, gather Wave data:
1, the DAQ card is chosen as the source of waveform.
2, adjust the quantity and the sampling rate of sampling, the quantity that makes sampling is divided by the twice of sampling rate greater than the line cycle.
Illustrate the result
With the form display waveform of analysis waveform and crest and the trough that recognizes.If the quantity of the quantity of crest and trough is unequal, perhaps the deviation between crest and the trough has surpassed acceptable level, and red turn-to-turn short circuit lamp will light.If do not recognize crest or wrong in the waveform that obtains, red error light will light.For file and Comp Sine sources of waveforms, have only the lantern festival of passage that input is responded, for the input of DAQ card, lamp will respond at they corresponding passages simultaneously.
Output to data file:
Press the file that save button will show that a dialog box prompting will write, the form of file will be:
Time?<Tab>?Input?Amplitude?<Tab>?Peak?time?<Tab>?Peak?Amplitude<Tab>?Valley?Time?<Tab>?Valley?Amplitude?<CR>
Here, first row is a head, and other row are data, empty trough and the crest value of " 0 " expression.
EOP (end of program):
Activate of the operation of STOP button, and return exploitation or quit a program terminator.
Claims (11)
1, a kind of online automatic detection method that is used for the variation of real time monitoring power generator air gap, this method comprises the following step:
Permanently analog to digital converter is connected on the magnetic flux detector;
Use the variation of magnetic flux detector measurement power generator air gap;
Use analog to digital converter to catch the measured value that power generator air gap changes with analog in form;
Use analog to digital converter that the power generator air gap measured value of analog form is converted to digital form;
The form of power generator air gap measured value with numeral sent in first computing machine that can connect network;
Can connect first computing machine and at least the second between the computing machine of network and set up network linking;
At least use second first computing machine of computer access;
Show the power generator air gap measured value by computer output equipment to the computer user.
2, the automatic monitoring method that is used for real time monitoring as claimed in claim 1 comprises following steps: the simulated data of 16 passages of input; The simulated data of two passages of output; And provide 8 digital input/output lines.
3, the automatic monitoring method that is used for real time monitoring as claimed in claim 1 further comprises: catch the variation of power generator air gap measured value, and the data that capture are sent to analog to digital converter with analog in form by the BNC cable.
4, the automatic monitoring method that is used for real time monitoring as claimed in claim 1, wherein the form with numeral further comprises the step that the power generator air gap measured value sends to first computing machine that is connected with Intranet:
Directly analog to digital converter is coupled together with the computing machine that first is connected with Intranet; With
Form with numeral transmits the power generator air gap measured value by direct connection.
5, the automatic monitoring method that is used for real time monitoring as claimed in claim 4, wherein directly connecting is connector and socket that is positioned at 68 pins on the computing machine on the analog to digital converter of being positioned at of one 68 pin.
6, the automatic monitoring method that is used for real time monitoring as claimed in claim 1, wherein this method has comprised second computing machine that uses the ICP/IP protocol connection to be positioned at first computing machine of first network and be positioned at second network.
7, the automatic monitoring method that is used for real time monitoring as claimed in claim 1, wherein first computing machine provides information with the form of hypertext, second these information of computer access.
8, the automatic monitoring method that is used for real time monitoring as claimed in claim 1, wherein this method comprises that the use wireless connections link the step of first computing machine and second computing machine.
9, the automatic monitoring method that is used for real time monitoring as claimed in claim 8 further comprises infrared ray, ultraviolet ray and/or radiowave wireless connections are provided.
10, the automatic monitoring method that is used for real time monitoring as claimed in claim 1, wherein this method is included in the step of setting up the relation of a server client between first and second computing machine.
11, the automatic monitoring method that is used for real time monitoring as claimed in claim 1 further is included on the computer monitor and shows the power generator air gap measured value graphically to the computer user.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HK03103198.1 | 2003-05-06 | ||
| HK03103198A HK1053237A2 (en) | 2003-05-06 | 2003-05-06 | Detection method for online realtime monitoring of generator air gap flux changes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1548978A true CN1548978A (en) | 2004-11-24 |
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ID=30130386
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031489354A Pending CN1548978A (en) | 2003-05-06 | 2003-07-01 | Online real-time detection method for variation of air gap magnetic field of generator |
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|---|---|
| CN (1) | CN1548978A (en) |
| HK (1) | HK1053237A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441685A (en) * | 2018-05-04 | 2019-11-12 | 安德烈·斯蒂尔股份两合公司 | The device and system of the on-state of drive motor for detection instrument |
-
2003
- 2003-05-06 HK HK03103198A patent/HK1053237A2/en not_active IP Right Cessation
- 2003-07-01 CN CNA031489354A patent/CN1548978A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441685A (en) * | 2018-05-04 | 2019-11-12 | 安德烈·斯蒂尔股份两合公司 | The device and system of the on-state of drive motor for detection instrument |
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| Publication number | Publication date |
|---|---|
| HK1053237A2 (en) | 2003-09-26 |
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