CN106762343A - The diagnostic method of the hydraulic generator set thrust bearing failure based on online data - Google Patents
The diagnostic method of the hydraulic generator set thrust bearing failure based on online data Download PDFInfo
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/008—Measuring or testing arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a kind of diagnostic method of the hydraulic generator set thrust bearing failure based on online data, including：In the coordinate system of thrust oil tray internal layout one, plate face of the X-axis of the coordinate system parallel to the thrust of thrust oil tray, the Y-axis of the coordinate system extends along the main shaft of thrust oil tray, inside thrust oil tray, in X to respectively installing a first untouchable displacement transducer with X-direction, and each first untouchable displacement transducer is installed towards thrust, and on the same circle with Y-axis as rotary shaft；Start turbine-generator units, obtain turbine-generator units original waveform data under the conditions of rotating speed is close to rated speed but without excitation；Based on the online monitoring data of turbine-generator units, the monitoring analysis to real time data gets the related datas such as unit vibration, throw, pressure fluctuation, displacement, and data are carried out with the analysis of system, science.The present invention is realized and automatically analyzes diagnosis to thrust bearing failure.
Description
Technical field
The present invention relates to the fault detection technique of turbine-generator units, more particularly to a kind of water wheels hair based on online data
The diagnostic method of group of motors thrust bearing failure.
Background technology
The real-time diagnosis of Hydropower Unit running status is directly connected to safe and stable operation, power quality and the electricity in power station
The important economic benefits indicator such as power production cost, its social benefit is huge.With power plant scale and monitoring accessory system not
Disconnected to expand, the control of unit and Monitoring Data information content are increasing, and operation operating personnel have in real time to operating states of the units
Effect monitoring, equipment fault to be made quickly and accurately judge become more and more difficult, therefore, the intelligent Hydropower Unit of research and development
Fault diagnosis system is very important.There are various abnormal conditions in Hydropower Unit, same unavoidably in the process of running
Anomaly may have different producing causes, and the failure for occurring has randomness, many of which thing power station staff
Cannot in advance, directly detect, typically to be searched according to the personal experience of staff and to the analysis of Monitoring Data therefore
The reason for barrier occurs and position, thus have certain subjectivity and limitation.
Therefore, run to ensure the normal safe of Hydropower Unit, its running status is detected, find that failure is levied in time
Million, it is ideal that engineering circles are dreamed of to accomplish that " maintenance forecasting " prevents trouble before it happens, and is also the hair of large-scale power station unit maintenance
Exhibition direction.
Fault Diagnosis of Hydroelectric Generating Set is the science for identification operating states of the units risen in recent years, is one multiple
Miscellaneous integrated system, the professional range being related to is wide.The state and failure of Hydropower Unit are timely and accurately diagnosed to be, to improving water power
Unit job stability, security reliability are significant.
The fault diagnosis of traditional turbine-generator units mainly has following 4 kinds of methods：
1st, the diagnostic method based on signal transacting
Diagnostic method based on signal transacting is basis and the premise of various diagnostic methods, is examined as a kind of traditional failure
Disconnected method, the characteristic value of signal, such as amplitude, the correlation between phase, frequency, variance, and signal can be surveyed according to system,
Certain relation existed between the source of trouble, by signal transacting and feature extraction, finds out its mapping between the source of trouble and closes
It is to carry out the fault diagnosis of operational outfit.
2nd, the diagnostic method based on analytic modell analytical model
Diagnostic method based on analytic modell analytical model is the diagnostic method based on control theory, and it sets up mathematical expression or solution
Analysis expression model, residual error, root are produced using methods such as observer, wave filter, equivalent space equation, parameter model estimation and identifications
The possibility for breaking down is judged according to the residual error of model.
3rd, the diagnostic method based on Heuristics
It is related to the method for the knowledge representation, treatment and application of research field, is referred to as Knowledge based engineering diagnostic method, as before
Barrier sign tree method, expert system method etc., they the characteristics of be that professional knowledge is carried out into table by way of semantic and framework
Reach, the diagnosis of failure is then carried out using reasoning and reasoning process, such as production rule reasoning, reasoning from logic, Illegible knowledge illation
Deng.
4th, the diagnostic method based on data-driven
Method for diagnosing faults based on data-driven is, using the online or offline status data of equipment long term accumulation, to answer
Be identified with statistical analysis pattern, nerual network technique or supporting vector machine model classification etc. method, by data learn and
Modeling, equipment state is identified and classified, and finally gives system failure that may be present.
With the development of China's hydropower, hydrogenerator single-machine capacity constantly increases, the work bar of its thrust bearing
Part is also all the more harsh, and especially in Large Hydroelectric Set, thrust bearing is used as most important " heart " part of unit, its work
Make the quality of performance, directly affect the safety of unit, reliability service.Therefore, needing to carry out to the service behaviour of thrust bearing
Line is detected.
The domestic research in terms of fault diagnosis technology is started late, and twentieth century begins one's study and attempts answering the end of the seventies
With diagnostic techniques, twentieth century proceeds by the research work of Intelligent fault diagnosis the nineties, and research method concentrates on fuzzy
Logical approach, FTA, expert system technology, artificial neural network technology etc., wherein expert system technology and nerve net
Network technology is the focus of application.Many monitoring diagnosis systems also begin to come into operation, but mostly concentrate on steam turbine and other
The monitoring and fault diagnosis of rotating machinery, the application for Hydropower Unit is little.This is low mainly due to Hydropower Unit rotating speed,
Safe operation to unit is not given to enough attention so that the research of Hydropower Unit on-line monitoring and fault diagonosing technology falls
After other (large-scale) rotating machineries.
In turbine-generator units, the method for traditional on-line checking thrust bearing service behaviour is：In one or more axle
The appropriate location of watt body is held, resistance thermometer is drilled and insert, when bearing runs, bearing shell is speculated by the reading of the thermometer
The temperature on surface, and then speculate that oil film forms situation.This method is simple, thus is often used to the running quality of monitoring bearing,
But resistance thermometer volume is larger, good contact is difficult with a watt body, thermal response speed is slow, and only selects burial place by rule of thumb,
Especially for the widely used EMP bearing shells in the current country, because a watt body surface face is a poor rigidity yielding and be bordering on thermal insulation
Elastic metal-plastic layer, therefore not only the error of measurement watt temperature can be larger, it is also difficult to, may even not be inferred to bearing shell table
The accurate temperature value in face, thus often causes burning accident.
The content of the invention
For above-mentioned technical problem, the present invention has designed and developed a kind of turbine-generator units thrust axis based on online data
Based on holding the diagnostic method of failure, its online monitoring data by turbine-generator units, the monitoring analysis to real time data is obtained
The related datas such as unit vibration, throw, pressure fluctuation, displacement are got, and data are carried out with the analysis of system, science, so that real
Diagnosis now is automatically analyzed to thrust bearing failure.
The present invention provide technical scheme be：
A kind of diagnostic method of the hydraulic generator set thrust bearing failure based on online data, including：
Step one, in the coordinate system of thrust oil tray internal layout one, the thrust mirror of the X-axis of the coordinate system parallel to thrust oil tray
The plate face of plate, the Y-axis of the coordinate system extends along the main shaft of thrust oil tray, inside thrust oil tray, is respectively installed to -X direction in X
One the first untouchable displacement transducer, and each first untouchable displacement transducer is towards thrust installation, and install
On the same circle with Y-axis as rotary shaft；
Step 2, turbine-generator units are started, obtain turbine-generator units in rotating speed close to rated speed but without excitation bar
Original waveform data under part；
Step 3, hypothesis fx(t) be arranged at X to the first untouchable displacement transducer produced by vibration displacement believe
Number, f-x(t) be arranged at-X to the first untouchable displacement transducer produced by vibration displacement signal, fx_1X(t) be X to
1X component vibration displacement signals, f-x_1X(t) be-X to 1X component vibration displacement signals, then have：
fx(t)=fx_vl(t)+fx_vv(t)+fx_wn(t),
f-x(t)=f-x_vl(t)+f-x_vv(t)+f-x_wn(t),
Wherein, fx_vl(t) be the main shaft with the thrust out of plumb caused by X to vibration displacement signal,
f-x_vl(t) be the main shaft with the thrust out of plumb caused by-X to vibration displacement signal, fx_vvT () is water wheels
The real vertical vibration of generating set X to vibration displacement signal, f-x_vvT () is the real Vertical Vibrating of turbine-generator units
Dynamic 1X components-X to vibration displacement signal, fx_wn(t) be the thrust wave degree caused by X to measuring
Displacement signal, f-x_wn(t) be the thrust wave degree caused by-X to the displacement signal for measuring；
Wherein, fx_1X(t)=fx_vl(t)+fx_vv1X(t),
f-x_1X(t)=f-x_vl(t)+f-x_vv1X(t),
fx_vv1X(t) for the real vertical vibration of turbine-generator units 1X components X to vibration displacement signal,
f-x_vv1X(t) for the real vertical vibration of turbine-generator units 1X components-X to vibration displacement signal；
Also, fx_vv1X(t)=f-x_vv1X(t),
fx_vl(t)=f-x_vl(t),
Then fx_1X(t)=fx_vl(t)+fx_vv1X(t),
f-x_1X(t)=- fx_vl(t)+fx_vv1X(t),
Finally, fx_vl(t)=(fx_1X(t)-f-x_1X(t))/2, then fx_vlT the amplitude of () is expressed as：
V=Amp (fx_vl(t)),
As V ＞ VlWhen, then judge that turbine-generator units have the failure of the main shaft and the thrust.
Preferably, the diagnostic method of the described hydraulic generator set thrust bearing failure in online data, also includes：
Step 4, acquisition stopping process turbine-generator units measure the signal for obtaining under the rotating speed of polar region；
Step 5, in turbine-generator units stopping process, when rotating speed is close to 0r/min, it is assumed that fx_vv(t)=0,
f-x_vv(t)=0；
To fxT () target signal filter 1X and following signal, remaining signal is approximately considered entirely due to the thrust
The displacement signal that the wave degree of runner plate is caused, then have W=Amp (fx' (t)), wherein, fx' (t) be fx(t) target signal filter 1X and with
Under signal；
As W ＞ Wl, then judge that the wave degree of the thrust of turbine-generator units is excessive.
Preferably, it is described in the diagnostic method of the hydraulic generator set thrust bearing failure of online data, it is described
First untouchable displacement transducer is current vortex sensor.
Preferably, the diagnostic method of the described hydraulic generator set thrust bearing failure in online data, also includes：
Step 6, three the second untouchable displacement transducers are set inside the thrust oil tray, three second non-connect
Touch property displacement transducer to be installed towards the thrust, and be distributed on the same circle with Y-axis as rotary shaft, and each other it
Between be spaced 120 °；
Step 7, during turbine-generator units are gradually stepped up in rotating speed, each second untouchable displacement transducer
The thrust is detected in three Uplifting amounts of position, when the Uplifting amount of three positions is inconsistent, and three liftings of position
Maximum difference in amount two-by-two between Uplifting amount is represented with L, as L ＞ LlWhen, then judge the thrust bearing shoe valve of the turbine-generator units
There is unhorizontal failure in face, and judge thrust bearing shoe valve plane to correspond to the relatively large orientation of Uplifting amount relatively low, and right
Answer the less orientation of Uplifting amount higher.
Preferably, it is described in the diagnostic method of the hydraulic generator set thrust bearing failure of online data, it is described
Second untouchable displacement transducer is current vortex sensor.
Preferably, the diagnostic method of the described hydraulic generator set thrust bearing failure in online data, also includes：
Step 8, output automatically analyze diagnosis report, wherein, the content for automatically analyzing diagnosis report includes：Shut down
During under de-energized rear rotating speed high, the big axle cycloid attitude and the running status of thrust of turbine-generator units；Shut down
In journey under minimum detectable rotating speed, the big axle cycloid attitude and the thrust running status of turbine-generator units；Calculate
The wave degree of the thrust of the thrust bearing for arriving, non-perpendicularity of the thrust with the main shaft and out of plumb side
Position, the not horizontal and orientation of the thrust bearing shoe valve.
Preferably, it is described in the diagnostic method of the hydraulic generator set thrust bearing failure of online data, it is described
In step 8, the diagnosis report that automatically analyzes is provided with WORD forms.
A kind of diagnostic method of hydraulic generator set thrust bearing failure based on online data of the present invention, it is with water
Based on the online monitoring data of turbine generator group, the monitoring analysis to real time data gets unit vibration, throw, pressure
The related datas such as pulsation, displacement, and data are carried out with the analysis of system, science, so as to realize to the automatic of thrust bearing failure
Analyzing and diagnosing.
Brief description of the drawings
Fig. 1 is a pair of the present invention set-up mode schematic diagrames of the first untouchable displacement transducer；
Fig. 2 is the product process figure for automatically analyzing diagnosis report of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
The present invention provides a kind of diagnostic method of the hydraulic generator set thrust bearing failure based on online data, including：
Step one, in the coordinate system of thrust oil tray internal layout one, the thrust mirror of the X-axis of the coordinate system parallel to thrust oil tray
The plate face of plate 2, the Y-axis of the coordinate system extends along the main shaft 1 of thrust oil tray, inside thrust oil tray, respectively pacifies to -X direction in X
Fill a first untouchable displacement transducer 3,4, and each first untouchable displacement transducer 3,4 pacifies towards thrust 2
Dress, and (please see Figure 1) on the same circle with Y-axis as rotary shaft.
Step 2, turbine-generator units are started, obtain turbine-generator units in rotating speed close to rated speed but without excitation bar
Original waveform data under part.
Step 3, one frequency of generation the X and-X of thrust 2 at can be caused due to main shaft 1 and the out of plumb of thrust 2
Rate is 1 overtones band of generating unit speed, the vibration displacement signal of phase difference 180 degree, it assumes that fx(t) be arranged at X to
One untouchable displacement transducer 3, the vibration displacement signal produced by 4, f-x(t) be arranged at-X to the first untouchable position
Displacement sensor 3, the vibration displacement signal produced by 4, fx_1X(t) be X to 1X component vibration displacement signals, f-x_1XT () is-X
To 1X component vibration displacement signals, then have：
fx(t)=fx_vl(t)+fx_vv(t)+fx_wn(t),
f-x(t)=f-x_vl(t)+f-x_vv(t)+f-x_wn(t),
Wherein, fx_vl(t) be the main shaft 1 with the out of plumb of the thrust 2 caused by X to vibration displacement believe
Number, f-x_vl(t) be the main shaft 1 with the out of plumb of the thrust 2 caused by-X to vibration displacement signal, fx_vv(t)
For turbine-generator units real vertical vibrations X to vibration displacement signal, f-x_vvT () is that turbine-generator units are real
The 1X components of vertical vibration-X to vibration displacement signal, fx_wnT () is that the wave degree of the thrust 2 is caused in X
To the displacement signal for measuring, f-x_wn(t) be the thrust 2 wave degree caused by-X to the displacement signal for measuring.
For fx(t) and f-xFor (t), its 1X component fx_1X(t)、f-x_1XT () is mainly due to main shaft 1 and thrust 2
Displacement signal and the 1X components of turbine-generator units vertical vibration are constituted caused by out of plumb, that is to say, that：
Wherein, fx_1X(t)=fx_vl(t)+fx_vv1X(t),
f-x_1X(t)=f-x_vl(t)+f-x_vv1X(t),
fx_vv1X(t) for the real vertical vibration of turbine-generator units 1X components X to vibration displacement signal,
f-x_vv1X(t) for the real vertical vibration of turbine-generator units 1X components-X to vibration displacement signal.
Also, for the vertical vibration signal of unit, no matter its phase and frequency complete one at X or at-X
Cause, its 1X component is also such, that is to say, that：
fx_vv1X(t)=f-x_vv1X(t)。
But for fx_vl(t) and f-x_vlT for (), its frequency is consistent, phase difference 180 degree, that is to say, that：
fx_vl(t)=f-x_vl(t)。
Then fx_1X(t)=fx_vl(t)+fx_vv1X(t),
f-x_1X(t)=- fx_vl(t)+fx_vv1X(t),
Finally, fx_vl(t)=(fx_1X(t)-f-x_1X(t))/2。
Generating unit speed is selected close to rated speed but without the original waveform data under the conditions of excitation, according to actually measured X
Place's vibration displacement signal and the vibration displacement signal at-X places, calculate through FFT and obtain fx_1X(t) and f-x_1XThe amplitude and phase of (t),
Calculated according to above formula and obtain fx_vlThe amplitude and phase of (t), then fx_vlT the amplitude of () is expressed as：
V=Amp (fx_vl(t)).As V ＞ VlWhen, then judge that turbine-generator units have the main shaft 1 with the thrust mirror
The failure of plate 2.
In a preferred embodiment, for wave degree characteristic parameter, stopping process unit is can select in polar region rotating speed
It is lower to measure the signal for obtaining, calculated according to following method and obtained, i.e., the described turbine-generator units thrust axis in online data
The diagnostic method of failure is held, is also included：
Step 4, acquisition stopping process turbine-generator units measure the signal for obtaining under the rotating speed of polar region.
Step 5, in turbine-generator units stopping process, when rotating speed is close to 0r/min, water wheels can be approximately considered
The real vertical vibration position 0 of generating set, that is to say, that：It is assumed that fx_vv(t)=0, f-x_vv(t)=0.
To fxT () target signal filter 1X and following signal, remaining signal is approximately considered entirely due to the thrust
The displacement signal that the wave degree of runner plate 2 is caused, then have W=Amp (fx' (t)), wherein, fx' (t) be fx(t) target signal filter 1X and
Following signal.As W ＞ Wl, then judge that the wave degree of the thrust 2 of turbine-generator units is excessive.
In a preferred embodiment, the diagnosis of the described hydraulic generator set thrust bearing failure in online data
In method, the first untouchable displacement transducer 3,4 is current vortex sensor.
Estimation for thrust bearing shoe valve levelness, it is necessary to differ 120 ° of position in thrust oil tray circumferential direction inside direction,
Three eddy current displacement sensors of even arrangement could be completed.Its general principle is as follows：
The horizontal plane that polylith thrust bearing shoe valve is constituted, approximately regards a plane for entirety as, and turbine-generator units are at very low turn
Under speed, thrust 2 is fitted (still have oil film therebetween certainly) with this plane approximation under gravity.If this
Thrust bearing shoe valve plane not level, then after turbine-generator units rotating speed is raised, after each guide bearing is carried completely, then thrust
The Uplifting amount of runner plate 2 will be inconsistent in each orientation, and the relatively low position Uplifting amount of thrust bearing shoe valve plane is larger, thrust bearing shoe valve plane compared with
Position Uplifting amount high is smaller, that is to say, that thrust 2 after lifting with thrust bearing shoe valve plane and not parallel.According to 3 positions
Measuring point diverse location Uplifting amount in whole boosting velocity procedure size, it is possible to approximately determine thrust bearing shoe valve plane at which
Orientation is relatively low, and which orientation is higher, and difference of height has much between highest orientation and minimum orientation, by highest orientation
Difference of height L represents (or perhaps maximum in the difference of Uplifting amount two-by-two) and minimum orientation between, as L ＞ LlWhen, can
Think that thrust tiling has unhorizontal failure.
In a preferred embodiment, the diagnosis of the described hydraulic generator set thrust bearing failure in online data
Method, also includes：
Step 6, three the second untouchable displacement transducers are set inside the thrust oil tray, three second non-connect
Touch property displacement transducer to be installed towards the thrust 2, and be distributed on the same circle with Y-axis as rotary shaft, and each other
Between be spaced 120 °；
Step 7, during turbine-generator units are gradually stepped up in rotating speed, each second untouchable displacement transducer
The thrust 2 is detected in three Uplifting amounts of position, when the Uplifting amount of three positions is inconsistent, and three liftings of position
Maximum difference in amount two-by-two between Uplifting amount is represented with L, as L ＞ LlWhen, then judge the thrust bearing shoe valve of the turbine-generator units
There is unhorizontal failure in face, and judge thrust bearing shoe valve plane to correspond to the relatively large orientation of Uplifting amount relatively low, and right
Answer the less orientation of Uplifting amount higher.
In a preferred embodiment, the diagnosis of the described hydraulic generator set thrust bearing failure in online data
In method, the second untouchable displacement transducer is current vortex sensor.
In a preferred embodiment, the diagnosis of the described hydraulic generator set thrust bearing failure in online data
Method, also includes：
Step 8, output automatically analyze diagnosis report, wherein, the content for automatically analyzing diagnosis report includes：Shut down
During under de-energized rear rotating speed high, the big axle cycloid attitude and the running status of thrust 2 of turbine-generator units；Shut down
In journey under minimum detectable rotating speed, the big axle cycloid attitude and the running status of the thrust 2 of turbine-generator units；Calculate
The wave degree of the thrust 2 of the thrust bearing for arriving, the non-perpendicularity of the thrust 2 and the main shaft 1 and does not hang down
Nogata position, the not horizontal and orientation of the thrust bearing shoe valve.
Please see Figure 2, Fig. 2 and show the product process figure for automatically analyzing diagnosis report.It is system to automatically analyze diagnostic function
According to failure mechanism, suitable data are chosen automatically, automatically analyzed and Statistic analysis, and provide assay diagnosis knot
Really.Whole analysis procedures system can be automatically performed and need not manually operate.
In above-mentioned flow, in addition to selection startup report needs are artificially selected, other links are all by the total score of system
Analysis diagnostic software is automatically performed.
This part function is mainly directed towards day-to-day operation staff.Possess following characteristics：
(1) it is easily operated.User of service need not be configured, select the complex operations such as data, using " one-key operation " formula
Software operation.
(2) data selection, calculating, decision process automation.All garbled datas and calculated according to failure or defect model
Process, analysis ratiocination, the process that judges completed by computer, without interactive operation in the middle of operating personnel.
(3) clear and definite analyzing and diagnosing conclusion and possible maintenance suggestion are provided in reporting.
(4) user interface is arrived in output in the form of reporting, and report can be automatically converted to the forms such as WORD.
In a preferred embodiment, check to wait for ease of carrying out report printing and operate, it is described in online data
Hydraulic generator set thrust bearing failure diagnostic method in, in the step 8, it is described automatically analyze diagnosis report with
WORD forms are provided.
Inside thrust oil tray, 180 ° or 120 ° of position is along the circumferential direction differed, be evenly arranged two or three electric whirlpools
Stream displacement transducer, installs towards thrust 2, motion of the on-line measurement thrust 2 in the middle of turbine-generator units operation
Situation.Turbine-generator units pass through arrow in three current vortex signals that start or stopping process unit are measured close under rated speed
Amount computing, can calculate the parameters such as thrust 2 and the non-perpendicularity of main shaft 1, out of plumb orientation and wave degree.Meanwhile, according to
Unit calculates not horizontal size and the side of rigid tile (i.e. thrust bearing shoe valve) in three relative variations of sensor gap of down speeding procedure
Position.
System calls the high density data of the complete stopping process of collection and storage automatically, and is shut down from motion tracking retrieval
Journey simultaneously retrieves data of the generating unit speed close under rotating speed high before rated speed, removal excitation from motion tracking, by Vector operation, meter
Calculate non-perpendicularity, out of plumb orientation and the runner plate wave degree of thrust 2 and main shaft 1；And retrieve generating unit speed from motion tracking
Data under minimum detectable rotating speed, calculate three relative changes in measuring point gap, and the not level of rigid tile is drawn accordingly
Degree and orientation.
Although embodiment of the present invention is disclosed as above, it is not restricted to listed in specification and implementation method
With, it can be applied to various suitable the field of the invention completely, for those skilled in the art, can be easily
Other modification is realized, therefore under the universal limited without departing substantially from claim and equivalency range, the present invention is not limited
In specific details and shown here as the legend with description.
Claims (7)
1. a kind of diagnostic method of the hydraulic generator set thrust bearing failure based on online data, it is characterised in that including：
Step one, in the coordinate system of thrust oil tray internal layout one, the X-axis of the coordinate system is parallel to the thrust of thrust oil tray
Plate face, the Y-axis of the coordinate system extends along the main shaft of thrust oil tray, inside thrust oil tray, in X to respectively installing one with -X direction
First untouchable displacement transducer, and each first untouchable displacement transducer is towards thrust installation, and installed in Y
Axle is on the same circle of rotary shaft；
Step 2, turbine-generator units are started, obtain turbine-generator units under the conditions of rotating speed is close to rated speed but without excitation
Original waveform data；
Step 3, hypothesis fx(t) be arranged at X to the first untouchable displacement transducer produced by vibration displacement signal,
f-x(t) be arranged at-X to the first untouchable displacement transducer produced by vibration displacement signal, fx_1X(t) be X to
1X component vibration displacement signals, f-x_1X(t) be-X to 1X component vibration displacement signals, then have：
fx(t)=fx_vl(t)+fx_vv(t)+fx_wn(t),
f-x(t)=f-x_vl(t)+f-x_vv(t)+f-x_wn(t),
Wherein, fx_vl(t) be the main shaft with the thrust out of plumb caused by X to vibration displacement signal, f-x_vl
(t) be the main shaft with the thrust out of plumb caused by-X to vibration displacement signal, fx_vvT () is hydraulic generator
The real vertical vibration of unit X to vibration displacement signal, f-x_vvT () is the real vertical vibration of turbine-generator units
1X components-X to vibration displacement signal, fx_wn(t) be the thrust wave degree caused by X to the displacement for measuring
Signal, f-x_wn(t) be the thrust wave degree caused by-X to the displacement signal for measuring；
Wherein, fx_1X(t)=fx_vl(t)+fx_vv1X(t),
f-x_1X(t)=f-x_vl(t)+f-x_vv1X(t),
fx_vv1X(t) for the real vertical vibration of turbine-generator units 1X components X to vibration displacement signal, f-x_vv1X(t)
For the real vertical vibration of turbine-generator units 1X components-X to vibration displacement signal；
Also, fx_vv1X(t)=f-x_vv1X(t),
fx_vl(t)=f-x_vl(t),
Then fx_1X(t)=fx_vl(t)+fx_vv1X(t),
f-x_1X(t)=- fx_vl(t)+fx_vv1X(t),
Finally, fx_vl(t)=(fx_1X(t)-f-x_1X(t))/2, then fx_vlT the amplitude of () is expressed as：
V=Amp (fx_vl(t)),
As V ＞ VlWhen, then judge that turbine-generator units have the failure of the main shaft and the thrust.
2. the diagnostic method of the hydraulic generator set thrust bearing failure in online data as claimed in claim 1, its feature
It is also to include：
Step 4, acquisition stopping process turbine-generator units measure the signal for obtaining under the rotating speed of polar region；
Step 5, in turbine-generator units stopping process, when rotating speed is close to 0r/min, it is assumed that fx_vv(t)=0, f-x_vv
(t)=0；
To fxT () target signal filter 1X and following signal, remaining signal is approximately considered entirely due to the thrust
The displacement signal that wave degree is caused, then have W=Amp (fx' (t)), wherein, fx' (t) be fx(t) target signal filter 1X and following letter
Number；
As W ＞ Wl, then judge that the wave degree of the thrust of turbine-generator units is excessive.
3. the diagnostic method of the hydraulic generator set thrust bearing failure of online data is based on as claimed in claim 1 or 2, its
It is characterised by, the first untouchable displacement transducer is current vortex sensor.
4. the diagnostic method of the hydraulic generator set thrust bearing failure in online data as claimed in claim 2, its feature
It is also to include：
Step 6, three the second untouchable displacement transducers are set inside the thrust oil tray, three second untouchable
Displacement transducer is installed towards the thrust, and is distributed on the same circle with Y-axis as rotary shaft, and each other between
Every 120 °；
Step 7, during turbine-generator units are gradually stepped up in rotating speed, each second untouchable displacement transducer detection
The thrust in three Uplifting amounts of position, when the Uplifting amount of three positions is inconsistent, and in three Uplifting amounts of position
The maximum difference between Uplifting amount represents with L two-by-two, as L ＞ LlWhen, then judge that the thrust tiling of the turbine-generator units is deposited
In unhorizontal failure, and thrust bearing shoe valve plane is judged to correspond to the relatively large orientation of Uplifting amount relatively low, and correspond to
The less orientation of Uplifting amount is higher.
5. the diagnostic method of the hydraulic generator set thrust bearing failure of online data is based on as claimed in claim 4, and it is special
Levy and be, the second untouchable displacement transducer is current vortex sensor.
6. the diagnostic method of the hydraulic generator set thrust bearing failure of online data is based on as claimed in claim 4, and it is special
Levy and be, also include：
Step 8, output automatically analyze diagnosis report, wherein, the content for automatically analyzing diagnosis report includes：Stopping process
In under de-energized rear rotating speed high, the big axle cycloid attitude and the running status of thrust of turbine-generator units；In stopping process
Under minimum detectable rotating speed, the big axle cycloid attitude and the thrust running status of turbine-generator units；It is calculated
The wave degree of the thrust of the thrust bearing, the non-perpendicularity and out of plumb orientation of the thrust and the main shaft,
The not horizontal and orientation of the thrust bearing shoe valve.
7. the diagnostic method of the hydraulic generator set thrust bearing failure of online data is based on as claimed in claim 6, and it is special
Levy and be, in the step 8, the diagnosis report that automatically analyzes is provided with WORD forms.
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