CN106556799A - A kind of On Fault Analysis of Generator and device - Google Patents
A kind of On Fault Analysis of Generator and device Download PDFInfo
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- CN106556799A CN106556799A CN201510638733.2A CN201510638733A CN106556799A CN 106556799 A CN106556799 A CN 106556799A CN 201510638733 A CN201510638733 A CN 201510638733A CN 106556799 A CN106556799 A CN 106556799A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
A kind of On Fault Analysis of Generator and device, the device include monitoring modular, waveform recording module, first waveform processing module, the second waveform processing module, the 3rd waveform processing module, the 4th waveform processing module and display module.The method and device solve the problems, such as generator shaft current failure analysis difficulty.In addition, the method and device are by single time-domain analysis, or frequency domain-Time-Series analysis is expanded to the frequency-domain analysis of time-domain curve, lookup to specific fault pattern provides important data indication with excluding, decomposition to combined failure pattern provides new channel, be conducive to setting up the fault analysis model of specification and troubleshooting prediction scheme, guide is provided to the collection rule of significant data, test number (TN) and accident analysis cycle are effectively reduced, so that Informational support is provided for the analysis of generator shaft current failure.
Description
Technical field
The present invention relates to technical field of generators, and in particular to a kind of On Fault Analysis of Generator and device.
Background technology
With the fast development of power construction, the gradually increase of single-machine capacity, shaft voltage become high-rating generator
Using a static serious problems from after simultaneously excitation system.
The waveform of shaft voltage has complicated harmonic pulse component, when destruction value of the shaft voltage not less than oil film,
Shaft current is very little.If shaft voltage exceedes bearing oil reservoir breakdown voltage, it is likely to form on bearing very big
Ablation parts of bearings is caused very big harm by shaft current, i.e., so-called spark machined electric current, shaft current.
The asymmetric shaft voltage for causing of magnetic is present in the AC type voltage at steam turbo generator two ends.Due to stator
The fan-shaped stamping of iron core employing, rotor eccentricity rate, the permeability difference of fanning strip, and cooling and clamping
The magnetic that the generators such as axial channel are manufactured and operation reason causes is asymmetric, and easily producing includes axle, axle
Hold with foundation sole plate in interior alternation magnetic linkage loop.Therefore voltage difference is produced at generator's motor shaft two ends.It is each
The asymmetric shaft voltage component that can all cause respective magnitudes and frequency of magnetic is planted, each shaft voltage component is superimposed upon one
Rise, make the frequency content of this shaft voltage very complicated, wherein the amplitude maximum of fundametal compoment, 3 times and 5 times
Harmonic amplitude is slightly smaller, and higher order harmonics component amplitude is less.
The shaft voltage that static excitation system causes is to change the impact of arc because of its silicon controlled rectifier, introduces one
Individual new shaft voltage source.Alternating voltage is exported DC voltage by static silicon controlled rectifier by static excitation system
Supply generator Exciting Windings for Transverse Differential Protection, this DC voltage are jerk type voltage.For the static state using three-phase full-controlled bridge
Excitation system, the waveform of its excitation output voltage have 6 pulses within 1 cycle.This is fast-changing
Pulsating volage by the Capacitance Coupled between the Exciting Windings for Transverse Differential Protection of generator and rotor body axle over the ground between, and
Produce corresponding alternating voltage.This kind of shaft voltage (works as excitation system for 300Hz in pulsation needle pattern, its frequency
When AC electric voltage frequency is 50Hz), it is added on the asymmetric shaft voltage for causing of magnetic, so that oil film
Bear higher peak voltage.
In addition, shaft voltage is it is also possible to the electrostatic caused by the friction of steam turbine low pressure (LP) cylinder blade and steam
Lotus accumulates to generate, and when having potential machinery, electric fault or hidden danger, caused by remanent magnetism, high level shaft voltage is also
One possible factor.
In addition, referring to Chinese patent CN201320503489.5 and CN201220026516.X, which is concrete
The reason for analyzing several generation shaft voltages.However, in above-mentioned patent, being all to merely provide how to subtract
The related art scheme of little shaft voltage, do not provide occur shaft voltage when, how to judge shaft voltage be due to
What which kind of failure caused.
Due to the possible factor for generating shaft voltage it is more, and for some fault types, on shaft current waveform
The token state of some directive property is there is, therefore shaft current waveform is analyzed is highly significant.
Existing shaft current online measuring technique mainly carries out shaft current, axle electricity when shaft current occurs and fluctuating
The measurement and waveform recording of pressure value, and event is carried out with the time domain specification of waveform by contrasting generator working conditions change
Barrier positioning and analysis, or set up shaft current detecting system and carry out the monitor in real time of time domain specification and band segment.
The possible factor that shaft voltage, shaft current are produced is more complicated, existing technical scheme substantially with when
A kind of analysis method based on the amplitude analysis in domain, the method is to insulation system failure, electrostatic charges accumulated situation
Have higher validity, but due to its criterion it is relatively single, it is abnormal to some sporadic shaft currents, static
High frequency shaft voltage, the non-power frequency concussion of the exception of earthed system and the different faults pattern that excitation system is introduced is simultaneously
The resolving power and sensitivity for the situation such as sending out is not enough, and especially under some rarer fault modes, time domain is special
Property and the information that can be provided of amplitude analysis be often not enough to support the actual demand of accident analysis.
The content of the invention
This application provides a kind of On Fault Analysis of Generator and device, solve generator shaft current failure
The problem of analysis difficulty, can provide Informational support for the analysis of generator shaft current failure.
According to the application's in a first aspect, this application provides a kind of On Fault Analysis of Generator, including：
Monitoring obtains waveform recording instruction；
Shaft current waveform is recorded according to waveform recording instruction；
Shaft current waveform to recording carries out sequential arrangement, to obtain the time domain waveform under the conditions of different operating；
Decompose from time domain waveform and obtain power-density spectrum and phase frequency spectrum；
Time-domain analysis is carried out to power-density spectrum, arrange out the power density of different frequency wave band with the time,
The time axial curve of operation conditions change, and curve mutation, the time point of operation conditions change are marked, with
To frequency-timing curve；
According to phase frequency spectrum with time, the change of condition of work, phase place angle is changed, condition of work
The time point of change is labeled on frequency-timing curve；
Display waveform curve.
In one embodiment, waveform recording instruction is the high alarm command of system shaft current or the instruction being manually entered.
In one embodiment, when recording shaft current waveform according to waveform recording instruction, waveform acquisition frequency is not low
In 2000HZ, the record length of caching is not less than 30 minutes.
In one embodiment, discrete Fourier transform is carried out to time domain waveform, power density frequency is obtained to decompose
Spectrum and phase frequency spectrum.
In one embodiment, methods described also includes that phase place angle changes, condition of work becomes according to marking
The step of the reason for frequency after the time point of change-timing curve analysis obtains shaft current abnormal failure；
During display waveform curve, failure cause is also shown simultaneously.
According to the second aspect of the application, present invention also provides a kind of generator failure analytical equipment, including：
Monitoring modular, obtains waveform recording instruction for monitoring；
Waveform recording module, for recording shaft current waveform according to waveform recording instruction；
First waveform processing module, carries out sequential arrangement for the shaft current waveform to recording, to obtain difference
Time domain waveform under condition of work；
Second waveform processing module, obtains power-density spectrum and phase frequency spectrum for decomposing from time domain waveform；
3rd waveform processing module, for carrying out time-domain analysis to power-density spectrum, arranges out different frequency
The power density of wave band is with time, the time axial curve of operation conditions change, and marks curve mutation, work
The time point of condition change, to obtain frequency-timing curve；
4th waveform processing module, for according to phase frequency spectrum with time, the change of condition of work, by phase place
Angle changes, the time point of operation conditions change is labeled on frequency-timing curve；
Display module, for display waveform curve.
In one embodiment, waveform recording instruction is the high alarm command of system shaft current or the instruction being manually entered.
In one embodiment, when waveform recording module is for recording shaft current waveform according to waveform recording instruction,
Waveform acquisition frequency is not less than 2000HZ, and the record length of caching is not less than 30 minutes.
In one embodiment, the second waveform processing module is for carrying out discrete Fourier transform to time domain waveform,
Power-density spectrum and phase frequency spectrum are obtained to decompose.
In one embodiment, described device also includes failure analysis module, for according to the 4th waveform processing mould
The reason for frequency of block output-timing curve analysis obtains shaft current abnormal failure；
Display module is additionally operable to the failure cause for showing failure analysis module output.
In a kind of On Fault Analysis of Generator and device that the application is provided, the device includes obtaining for monitoring
Take the monitoring modular of waveform recording instruction；For the waveform record for recording shaft current waveform is instructed according to waveform recording
Molding block；Sequential arrangement is carried out for the shaft current waveform to recording, with obtain under the conditions of different operating when
The first waveform processing module of domain waveform；Power-density spectrum and phase place are obtained for decomposing from time domain waveform
Second waveform processing module of frequency spectrum；For time-domain analysis being carried out to power-density spectrum, arrange out different frequencies
The power density of rate wave band is with time, the time axial curve of operation conditions change, and marks curve mutation, work
Make the time point of condition change, to obtain the 3rd waveform processing module of frequency-timing curve；For according to phase
Phase place angle is changed, the time of operation conditions change by position frequency spectrum with time, the change of condition of work
Point is labeled in the 4th waveform processing module on frequency-timing curve；For the display module of display waveform curve.
The method and device solve the problems, such as generator shaft current failure analysis difficulty.In addition, the method and device
By single time-domain analysis, or frequency domain-Time-Series analysis is expanded to the frequency-domain analysis of time-domain curve, to specific therefore
Searching for barrier pattern provides important data indication with excluding, and the decomposition to combined failure pattern is provided newly
Channel, be conducive to setting up the fault analysis model and troubleshooting prediction scheme of specification, the collection to significant data
Rule is provided to be guided, and is effectively reduced test number (TN) and accident analysis cycle, so as to for generator shaft electric current
Accident analysis provides Informational support.
Description of the drawings
Fig. 1 is the oscillogram recorded when generator shaft current failure is analyzed；
Fig. 2 is 50HZ frequency domains-sequential chart when generator shaft current failure is analyzed；
Fig. 3 is 400HZ frequency domains-sequential chart when generator shaft current failure is analyzed；
Fig. 4 is the schematic flow sheet of On Fault Analysis of Generator in a kind of embodiment of the application；
Fig. 5 is the module diagram of generator failure analytical equipment in a kind of embodiment of the application；
Fig. 6 is the module diagram of generator failure analytical equipment in the application another kind embodiment.
Specific embodiment
At present, for the elevated analysis of causes of generator shaft voltage, only rest on studio shaft current waveform
On, based on the amplitude analysis of time domain, its Limited information for providing is not enough to support the reality of accident analysis
Demand.And when this problem is raised in the face of generator shaft voltage, those skilled in the art are often partial to grind
Study carefully and how to reduce or avoid shaft voltage from raising, and have ignored how could convenient, analysis axis electricity exactly
The reason for pressure is raised.
Existing shaft current, shaft voltage time-domain analysis are generally based on the right of shaft current desired value different from other
Make than analysis, wherein basic only consider situation of change of the amplitude with different tests event.This analysis side
Method electrostatic charges accumulated, shafting insulation fault is caused shaft current amplitude raise, the situation of waveform acute variation be
Sensitive, but impact of some failures to shaft current amplitude be not obvious, and the accumulated time of some hidden failures
Effect in this transient analysis is difficult to be observed, and now this method is just less applicable.
Fig. 1 is refer to, is the primary fault analysis of nuclear power station generator shaft electric current, by shown in figure, a certain
Timing node due to simulate bearing shell ground connection failure, certain bearing shell record voltage jump be 0 situation, examination
The purpose tested is what change is the shaft current for comparing now passage ch1 have in amplitude and curve, it can be seen that
Significant change is had no in this example.
Main purpose of the present invention is, on the basis of the time-domain analysis for carrying out generator shaft voltage, shaft current,
Traveling one is entered to the waveform under failure and abnormality by introducing frequency domain-Time-Series analysis and phase place-Time-Series analysis
Step analysis, to fill up frequency domain, the blind spot of amplitude analysis and disappearance, in the hope of more effective, accurate, timely
Carry out the elevated analysis of causes of generator shaft voltage.
Fig. 2 is refer to, most intuitively benefit is that discovery can not be straight in oscillogram to of frequency domain-Time-Series analysis
" frequency " amount that sight is monitored slight change produced when occurring with events such as test, failures, to above
The little passage ch1 of change is seemed in example carry out frequency domain-sequential and launch, contrast event former and later two time points
The energy density of power frequency 50HZ trend over time, can obviously seeing
Its ratio shared by power frequency amount significantly rises afterwards, it is contemplated that shaft current amplitude does not occur significant change, then
The lifting of power frequency amount necessarily implies that the decrease of some components.
Refer to Fig. 3, analyze on frequency spectrum again more bright 400Hz (as generator is Half Speed machine,
400Hz amounts are really 16 frequencys multiplication) value, as a result show which there occurs decay in same time point really, this
The time change planted on frequency domain is difficult to obtain by original timing waveform analysis.
Accompanying drawing is combined below by specific embodiment to be described in further detail the application.
Fig. 4 is refer to, a kind of On Fault Analysis of Generator is present embodiments provided, which includes below step：
Step 1.1：Monitoring obtains waveform recording instruction.In a particular embodiment, waveform recording instructs and can be
The high alarm command of system shaft current or the instruction being manually entered.
Step 1.2：Shaft current waveform is recorded according to waveform recording instruction.
When generator occur accidental, regular shwoot shaft current it is high report to the police, or the abnormal shaft current of long-term existence,
But amplitude be not enough to triggering report to the police when, first generator shaft current waveform is recorded, oscillograph or other
The frequency acquisition of Waveshape Collecting System should be not less than 2000HZ, and the record length of caching should be not less than 30 minutes.
For the voltage in most of shafting, the magnitude of current, power frequency, frequency multiplication, multiple frequence, solid is contained
There is the multifrequency electricity such as frequency, it is contemplated that the feature that generator shaft is fastened, electricity of the analysis higher than 1000HZ
Have little significance.For frequency analysis, maximum resolution ratio is the half of sample frequency, i.e. 2000HZ's
Sample frequency maximum can reflect the frequency characteristic of 1000HZ.Therefore it is not lower than this value.
As, in subsequent step, frequency analysis needs to use various types of Fourier spaces decomposition, to sampling
Time have certain requirement, it is contemplated that different event, test triggering need operating time, can enroll
Time it is too short be not enough to complete analysis, 30 minutes is minimum requirements.
If sporadic failure, then immediately waveform is stored in reliable medium in fault alarm, and is held
Continuous admission waveform is until failure vanishes；If long-term lasting failure, then within the failure duration at times,
The segmentation admission waveform of divided working status, it is timely when generator lifts power, start and stop, has other fault alarms
Retain waveform；If necessary, the means for judging as assist trouble, bearing shell to generator diverse location and big
Axle is grounded experiment in short-term to be carried out the change operating mode of artificial property and records the voltage of correspondence position, current waveform.
Division at times depends on the initial analysis to failure, if this failure is time correlation (after generation
Electricity is with time increasing or decreasing), then repeatedly record ripple in the time planted agent for producing significant change, concrete frequency with
Decay, the speed being incremented by are relevant；Divided working status then mainly in the analysis of failure dependency, such as by bearing shell
Before and after analogue ground, before and after with other means release electrostatics, will be the part interference source of exciter control system temporary transient
Before and after shielding etc..For the change that concrete failure is made to generator shafting, before and after generation can be considered as
Different operating modes.
It should be noted that all waveforms are enrolled be difficult to for most of routine recording wave device, because
Always limited for memory space, under so high sample frequency, the waveform that can be enrolled is limited.And this
The method that embodiment is provided is mainly used in the analysis after failure, the especially analysis of solid fault, analyzes such
Failure is enrolled all waveforms and be there is no need.But, however not excluded that, in some embodiments it is possible to enter to waveform
Row is enrolled in real time, and does not carry out selecting admission or segmentation admission.
Step 1.3：Shaft current waveform to recording carries out sequential arrangement, with obtain under the conditions of different operating when
Domain waveform.In the embodiment of the present application, " different operating condition " refers to different operating modes, different capacity, different positions
Put the conditions such as ground connection experiment.
In this step, first to enroll waveform carry out sequential arrangement, indicate different operating modes, different capacity,
During diverse location ground connection experiment, the absolute time of recorded waveform, is arranged on unified time shaft.
Step 1.4：Decompose from time domain waveform and obtain power-density spectrum and phase frequency spectrum.
In the present embodiment, discrete Fourier transform is carried out to all time domain waveforms on time shaft, it is preferred that
Discrete fourier is carried out using FFT (Fast Fourier Transformation, Fast Fourier Transform (FFT)) method
Conversion, and decomposites power-density spectrum and phase frequency spectrum, by two row frequency spectrums with time-domain curve together, side by side
Arrangement is on a timeline.
Step 1.5：Time-domain analysis is carried out to power-density spectrum, the power density of different frequency wave band is arranged out
With time, the time axial curve of operation conditions change, and mark curve mutation, the time of operation conditions change
Point, to obtain frequency-timing curve.
Specifically, time-domain analysis is carried out to the power density of the main composition frequency of fault current, is arranged out not
The power density of same frequency wave band is with time, the time axial curve of working conditions change, and marks curve mutation, work
Time point and experiment, action situation that condition changes.Herein, " action situation " includes being grounded a certain bearing shell,
Or by test actions such as excitation machine control signal shieldings, or the simple test actions such as axle are touched with brush.
Step 1.6：According to phase frequency spectrum with time, the change of condition of work, phase place angle is changed,
The time point of operation conditions change is labeled on frequency-timing curve.
Specifically, check phase place collection of illustrative plates with time, the change of operating mode, the time that phase place angle is changed
Point and action, experimental conditions are labeled on the frequency-timing curve of step 1.5 formation.
Step 1.7：Display waveform curve.
After step 1.7, by for the presentation of information required for analysis axis current failure out after, can be by people
Work is analyzed, to obtain failure cause.
Time domain comparative analysis is carried out to a plurality of frequency-temporal characteristicses curve of different frequency, you can obtain in failure
Under the states such as generation, disappearance or operating mode change, system concussion, the situation of change of different frequency fault current,
And thus further can analyze fault current frequency composition and correlative factor, if the change collection of fault current
In in a certain CF, then can be substantially reduced the scope of failure mode analysis (FMA), if the change of fault current exists
A certain frequency range is not notable, then can exclusive segment fault type possibility, and for further failure mode analysis (FMA),
Compound failure decomposes the data reference and failure criterion for providing preciousness.
In other embodiments, On Fault Analysis of Generator also include according to mark phase place angle change,
The step of the reason for frequency after the time point of operation conditions change-timing curve analysis obtains shaft current abnormal failure
Suddenly.In display waveform curve step, failure cause is also shown simultaneously.
Fig. 5 is refer to, the present embodiment additionally provides a kind of generator failure analytical equipment, including monitoring modular
101st, waveform recording module 102, first waveform processing module 103, the second waveform processing module the 104, the 3rd
Waveform processing module 105, the 4th waveform processing module 106 and display module 107.
Monitoring modular 101 is used to monitor acquisition waveform recording instruction.In a particular embodiment, waveform recording refers to
Order can be the high alarm command of system axle electric current or the instruction being manually entered.
Waveform recording module 102 is for according to waveform recording instruction recording shaft current waveform.
When generator occur accidental, regular shwoot shaft current it is high report to the police, or the abnormal shaft current of long-term existence,
But when amplitude is not enough to triggering warning, first generator shaft current waveform is recorded, waveform recording module
102 frequency acquisition should be not less than 2000HZ, and the record length of caching should be not less than 30 minutes.
For the voltage in most of shafting, the magnitude of current, power frequency, frequency multiplication, multiple frequence, solid is contained
There is the multifrequency electricity such as frequency, it is contemplated that the feature that generator shaft is fastened, electricity of the analysis higher than 1000HZ
Have little significance.For frequency analysis, maximum resolution ratio is the half of sample frequency, i.e. 2000HZ's
Sample frequency maximum can reflect the frequency characteristic of 1000HZ.Therefore it is not lower than this value.
As, in subsequent step, frequency analysis needs to use various types of Fourier spaces decomposition, to sampling
Time have certain requirement, it is contemplated that different event, test triggering need operating time, can enroll
Time it is too short be not enough to complete analysis, 30 minutes is minimum requirements.
If sporadic failure, then immediately waveform is stored in reliable medium in fault alarm, and is held
Continuous admission waveform is until failure vanishes；If long-term lasting failure, then within the failure duration at times,
The segmentation admission waveform of divided working status, it is timely when generator lifts power, start and stop, has other fault alarms
Retain waveform；If necessary, the means for judging as assist trouble, bearing shell to generator diverse location and big
Axle is grounded experiment in short-term to be carried out the change operating mode of artificial property and records the voltage of correspondence position, current waveform.
Division at times depends on the initial analysis to failure, if this failure is time correlation (after generation
Electricity is with time increasing or decreasing), then repeatedly record ripple in the time planted agent for producing significant change, concrete frequency with
Decay, the speed being incremented by are relevant；Divided working status then mainly in the analysis of failure dependency, such as by bearing shell
Before and after analogue ground, before and after with other means release electrostatics, will be the part interference source of exciter control system temporary transient
Before and after shielding etc..For the change that concrete failure is made to generator shafting, before and after generation can be considered as
Different operating modes.
It should be noted that all waveforms are enrolled be difficult to for most of routine recording wave device, because
Always limited for memory space, under so high sample frequency, the waveform that can be enrolled is limited.And this
The device that embodiment is provided is mainly used in the analysis after failure, the especially analysis of solid fault, analyzes such
Failure is enrolled all waveforms and be there is no need.But, however not excluded that, in certain embodiments, waveform recording module
102 can be enrolled in real time to waveform, and not carry out selecting admission or segmentation admission.
First waveform processing module 103 carries out sequential arrangement for the shaft current waveform to recording, to obtain not
With the time domain waveform under condition of work.In the embodiment of the present application, " different operating condition " refer to different operating modes,
The conditions such as different capacity, diverse location ground connection experiment.
In the present embodiment, waveform of the first waveform processing module 103 first to enrolling carries out sequential arrangement, marks
The absolute time of waveform recorded when different operating modes, different capacity, diverse location ground connection experiment, general are shown
Which is arranged on unified time shaft.
Second waveform processing module 104 obtains power-density spectrum and phase place frequency for decomposing from time domain waveform
Spectrum.
In the present embodiment, discrete Fourier transform is carried out to all time domain waveforms on time shaft, it is preferred that
Discrete fourier is carried out using FFT (Fast Fourier Transformation, Fast Fourier Transform (FFT)) method
Conversion, and decomposites power-density spectrum and phase frequency spectrum, by two row frequency spectrums with time-domain curve together, side by side
Arrangement is on a timeline.
3rd waveform processing module 105 arranges out different frequencies for carrying out time-domain analysis to power-density spectrum
The power density of rate wave band is with time, the time axial curve of operation conditions change, and marks curve mutation, work
Make the time point of condition change, to obtain frequency-timing curve.
Specifically, time-domain analysis is carried out to the power density of the main composition frequency of fault current, is arranged out not
The power density of same frequency wave band is with time, the time axial curve of working conditions change, and marks curve mutation, work
Time point and experiment, action situation that condition changes.Herein, " action situation " includes being grounded a certain bearing shell,
Or by test actions such as excitation machine control signal shieldings, or the simple test actions such as axle are touched with brush.
4th waveform processing module 106 for according to phase frequency spectrum with time, the change of condition of work, by phase
Angle changes, the time point of operation conditions change is labeled on frequency-timing curve for position.
Specifically, check phase place collection of illustrative plates with time, the change of operating mode, the time that phase place angle is changed
Point and action, experimental conditions are labeled on the frequency-timing curve of step 1.5 formation.
Display module 107 is used for display waveform curve.
Display module 107 by for the presentation of information required for analysis axis current failure out after, can be by people
Work is analyzed, to obtain failure cause.
Time domain comparative analysis is carried out to a plurality of frequency-temporal characteristicses curve of different frequency, you can obtain in failure
Under the states such as generation, disappearance or operating mode change, system concussion, the situation of change of different frequency fault current,
And thus further can analyze fault current frequency composition and correlative factor, if the change collection of fault current
In in a certain CF, then can be substantially reduced the scope of failure mode analysis (FMA), if the change of fault current exists
A certain frequency range is not notable, then can exclusive segment fault type possibility, and for further failure mode analysis (FMA),
Compound failure decomposes the data reference and failure criterion for providing preciousness.
Fig. 6 is refer to, in other embodiments, generator failure analytical equipment also includes failure analysis module
108, the frequency-timing curve analysis for being exported according to the 4th waveform processing module 106 obtains shaft current exception
The reason for failure.Display module 107 is additionally operable to the failure cause for showing the output of failure analysis module 108.
On Fault Analysis of Generator and device that the embodiment of the present application is provided, the main fault type bag being suitable for
Exciter control system failure is included, shafting imperfect earth, parasitic loop produce the relevant issues such as high-frequency resonance,
And the assistant analysis soaring to the amplitude of shaft current unknown cause.Due to the drafting of waveform be based on FFT,
Therefore in addition to energy density, phase angle can also be extracted, due to the phase angle difference of various electricity in shafting
Relatively-stationary, if which changes, illustrate on circuit structure exist additionally introduce perception or
Capacitive reactances, contributes to the assistant analysis of fault type.
It should be noted that the On Fault Analysis of Generator and device of the embodiment of the present application offer are adapted to
In nuclear power, the generator of thermoelectricity military service, Hydropower Unit etc., to solve generator shaft current failure analysis difficulty
Problem, for generator shaft current failure analysis Informational support is provided.
It will be understood by those skilled in the art that all or part of step of various methods can in above-mentioned embodiment
Related hardware is controlled with by program to complete, the program can be stored in a computer-readable recording medium,
Storage medium can include：Read-only storage, random access memory, disk or CD etc..
Above content is the further description made to the application with reference to specific embodiment, it is impossible to recognized
Determine the application be embodied as be confined to these explanations.For the ordinary skill of the application art
For personnel, on the premise of conceiving without departing from the present application, some simple deductions can also be made or replaced
Change.
Claims (10)
1. a kind of On Fault Analysis of Generator, it is characterised in that include：
Monitoring obtains waveform recording instruction；
Shaft current waveform is recorded according to waveform recording instruction；
Shaft current waveform to recording carries out sequential arrangement, to obtain the time domain waveform under the conditions of different operating；
Decompose from time domain waveform and obtain power-density spectrum and phase frequency spectrum；
Time-domain analysis is carried out to power-density spectrum, arrange out the power density of different frequency wave band with the time,
The time axial curve of operation conditions change, and curve mutation, the time point of operation conditions change are marked, with
To frequency-timing curve；
According to phase frequency spectrum with time, the change of condition of work, phase place angle is changed, condition of work
The time point of change is labeled on frequency-timing curve；
Display waveform curve.
2. method as claimed in claim 1, it is characterised in that waveform recording instruction is the high report of system shaft current
Alert instruction or the instruction being manually entered.
3. method as claimed in claim 1, it is characterised in that shaft current ripple is recorded according to waveform recording instruction
During shape, waveform acquisition frequency is not less than 2000HZ, and the record length of caching is not less than 30 minutes.
4. method as claimed in claim 1, it is characterised in that discrete Fourier transform is carried out to time domain waveform,
Power-density spectrum and phase frequency spectrum are obtained to decompose.
5. such as the method for any one of claim 1-4, it is characterised in that also include according to mark phase place folder
Angle changes, the frequency after the time point of operation conditions change-timing curve analysis obtain shaft current it is abnormal therefore
The step of the reason for barrier；
During display waveform curve, failure cause is also shown simultaneously.
6. a kind of generator failure analytical equipment, it is characterised in that include：
Monitoring modular, obtains waveform recording instruction for monitoring；
Waveform recording module, for recording shaft current waveform according to waveform recording instruction；
First waveform processing module, carries out sequential arrangement for the shaft current waveform to recording, to obtain difference
Time domain waveform under condition of work；
Second waveform processing module, obtains power-density spectrum and phase frequency spectrum for decomposing from time domain waveform；
3rd waveform processing module, for carrying out time-domain analysis to power-density spectrum, arranges out different frequency
The power density of wave band is with time, the time axial curve of operation conditions change, and marks curve mutation, work
The time point of condition change, to obtain frequency-timing curve；
4th waveform processing module, for according to phase frequency spectrum with time, the change of condition of work, by phase place
Angle changes, the time point of operation conditions change is labeled on frequency-timing curve；
Display module, for display waveform curve.
7. device as claimed in claim 6, it is characterised in that waveform recording instruction is the high report of system shaft current
Alert instruction or the instruction being manually entered.
8. device as claimed in claim 6, it is characterised in that waveform recording module is for according to waveform recording
When shaft current waveform is recorded in instruction, waveform acquisition frequency is not less than 2000HZ, and the record length of caching is not less than
30 minutes.
9. device as claimed in claim 6, it is characterised in that the second waveform processing module is for time domain ripple
Shape carries out discrete Fourier transform, obtains power-density spectrum and phase frequency spectrum to decompose.
10. such as the device of any one of claim 6-9, it is characterised in that also including failure analysis module,
Frequency-timing curve analysis for being exported according to the 4th waveform processing module obtains the original of shaft current abnormal failure
Cause；
Display module is additionally operable to the failure cause for showing failure analysis module output.
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