CN106768274A - A kind of Generator Stator Winding Ends vibration monitor system and monitoring method - Google Patents
A kind of Generator Stator Winding Ends vibration monitor system and monitoring method Download PDFInfo
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- CN106768274A CN106768274A CN201611167783.8A CN201611167783A CN106768274A CN 106768274 A CN106768274 A CN 106768274A CN 201611167783 A CN201611167783 A CN 201611167783A CN 106768274 A CN106768274 A CN 106768274A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
Abstract
The invention discloses a kind of Generator Stator Winding Ends vibration monitor system and monitoring method, including generator, the first acceleration transducer, display, industrial computer, monitoring host computer, radially circumferencial direction is fixed on the shell at generator vapour end and excitation end first acceleration transducer.The present invention is arranged on motor housing end by by the first acceleration transducer, effectively prevent the interference of motor internal high pressure, high magnetic field environments to sensor, by the Oscillation Amplitude for detecting outer casing end, obtain the Oscillation Amplitude of stator winding end, obtain approximate one complete end winding vibration situation of stator winding end, vibration source monitoring is accurate, and positioning precision is high；And motor body will not be caused in acceleration transducer installation process damage, installation, maintenance is convenient.
Description
Technical field
The present invention relates to generating set running state monitoring technical field, more particularly to a kind of generator unit stator winding terminal
Portion's vibration monitor system and monitoring method.
Background technology
Recent year is subject to the set state monitoring that run unit is paid much attention to when Generator Stator Winding Ends vibrate
Newly-increased focus.In power plant production run, large turbo-type generator stator winding end caused due to vibration bar wear and tear,
Insulation damages even cause phase fault, burn the failures such as winding or accident happens occasionally, during many starter/generator short troubles
Because mechanical oscillation cause insulating materials to damage what is triggered.
Generator Stator Winding Ends vibration is the leakage magnetic flux interaction due to generator stator coil end part and end,
So that stator winding end is subject to and rotating speed identical electric rotating magneticaction.The radial component of electromagnetic force is to cause winding overhang
The main exciting force of structural vibration, it has elliptic systems pattern, and its frequency is equal to the twice of steam turbine generator speed-frequency, right
For rotating speed is for the steam turbine generator of 3000r/min, electromagnetic force frequency is close or equal to 100Hz.When generator unit stator winding terminal
Portion two ends（Encourage end, vapour end）When ellipse vibration shape modal frequency is close or equal to 100Hz, stator winding end will produce larger shaking
Dynamic or resonance, this will cause stator winding end insulation abrasion, cooling water pipe joint to be revealed, the malicious event such as phase fault,
The normal operation of group of motors is directly affected, great economic loss is caused.
With the fast development that domestic Generator Set puts into operation, Stator End Winding vibration is subject to higher and higher heavy
Depending on, there is certain necessity to the monitoring of Stator End Winding vibration, operating vibration amplitude is measured in real time, accomplish early stage
Alarm, it is to avoid sudden accident.Country is also proposed the state on generator windings end portion vibration measuring method and assessment criteria
Family's standard《Turbine-type Generator stator winding end dynamic characteristic and vibration testing method and evaluation GB/T 20140-2006》.
Wherein it is more than 250um for End winding amplitude, needs to make alarm less than 400um, End winding amplitude is more than
400um, and End winding amplitude variations more than 100um when need to make shutdown measure.
Due to the high pressure inside Generator Set, strong-electromagnetic field environment, the on-line monitoring of Generator Stator Winding Ends
Technology is always difficulties, and present wide variety of end vibration measuring system is namely based on optical fiber sensing technology, by multiple optics
Sensing probe is directly fixed in each orientation of End winding, directly gathers end winding bar vibration signal.Because optical fiber is passed
Sensor is free of metal, and sensing probe does not have any electronic component, so as to avoid the shadow of motor internal high pressure, highfield to monitoring
Ring.But such monitoring system installs cumbersome, the fixation of motor internal sensing probe is more bothered, and the cabling of optical fiber is very numerous
It is trivial, and need when mounted in the drilling of generator fuselage so as to lead, certain infringement can be caused to generator fuselage, integrally set
Standby maintenance is also more difficult.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, designs a kind of Generator Stator Winding Ends vibration monitoring
System and monitoring method, optical sensing probe installs cumbersome in solving existing vibration measuring system, and the fuselage of generator can be caused
Damage, influence the problem of generator air-tightness.
To reach above-mentioned purpose, the technical solution adopted in the present invention is：
A kind of Generator Stator Winding Ends vibration monitor system, including generator, multiple are for detecting generator end shell
Display, industrial computer, prison are disposed with from top to bottom in first acceleration transducer of Oscillation Amplitude, cabinet, the cabinet
Control main frame, radially circumferencial direction is fixed on the shell at generator vapour end and excitation end first acceleration transducer, the
The vibration signal of end enclosure is passed to monitoring host computer by one acceleration transducer by cable signal line, and monitoring host computer is according to connecing
The vibration signal of receipts calculates the Oscillation Amplitude of End winding and vibration data is passed into industrial computer, and industrial computer is by End winding
Vibration data pass to display and carry out visualization and show.
Further, first acceleration transducer uses piezoelectric acceleration transducer or magneto-electric acceleration sensing
Device, is uniformly fixed on generator vapour end and excitation end housing by stickup or bolt.
Further, first acceleration transducer uses distributed fiberoptic sensor, and multiple-turns wound is in generator vapour
On the shell at end and excitation end.
A kind of Generator Stator Winding Ends vibration monitoring method, specifically includes following steps：
Step 1：Build generator vibration source Oscillation Amplitude database；
Step 2：First acceleration transducer detects the vibration signal of stator end shell, and monitoring host computer determines any two first
Acceleration transducer detects the sequencing of vibration signal；
Step 3：The vibration signal of 50HZ fundamental frequencies that the first acceleration transducer collects and 100HZ frequencys multiplication is extracted, stator is obtained
First amplitude of end enclosure, according to Oscillation Amplitude database, the first amplitude, obtains the vibration attenuation coefficient of vibration source；
Step 4：The second amplitude of End winding is calculated according to inside and outside amplitude-frequency response formula；
Step 5：Judge whether the second amplitude exceedes early warning value, if the second amplitude is more than α μm, monitoring host computer sends alarm signal
And the Oscillation Amplitude of End winding is shown over the display；If the second amplitude is more than β μm, monitoring host computer control generator stops
Alarm signal is run and sent, the Oscillation Amplitude of End winding is shown over the display.
In the step 5, if the changing value of the second amplitude is more than γ μm, monitoring host computer control generator is out of service simultaneously
Send alarm signal.
It is described to build concretely comprising the following steps for generator vibration source Oscillation Amplitude database：
Step 1.1：Multiple first acceleration transducers are fixed on stator end shell, it is fixed multiple with the on End winding
Clock orientation second acceleration transducer of identical of one acceleration transducer；
Step 1.2：Using a clock orientation of impact power hammer excitation winding bar, it is 200HZ winding bar is produced frequency
Following vibration signal, the first acceleration transducer detects the first amplitude, and the second acceleration transducer detects the second amplitude, according to
Inside and outside amplitude-frequency response formula, the first amplitude, the second amplitude meter calculate the vibration attenuation coefficient in the clock orientation；
Step 1.3：Step 1.2 is repeated several times, line number is entered to the first amplitude, the second amplitude and corresponding vibration attenuation coefficient
According to statistics, Oscillation Amplitude database is built；
Step 1.4：Remove the second acceleration transducer on End winding.
Amplitude-frequency response formula is inside and outside described, wherein A1 first shakes for End winding
Width, A2 for end enclosure the second amplitude, Q for vibration attenuation coefficient, v for vibration signal spread speed, f be 50HZ or
100HZ, x2-x1It is the distance of any one acceleration transducer to vibration source.
Positive beneficial effect of the invention：
1st, acceleration transducer is arranged on motor housing by the Generator Vibration monitoring system based on external sensor of the invention
End, by detecting the Oscillation Amplitude of outer casing end, obtains the Oscillation Amplitude of stator winding end, effectively prevent motor internal
The interference of high pressure, high magnetic field environments to sensor.
2nd, acceleration transducer is pasted or is bolted on motor housing, is installed to acceleration transducer
During will not to motor body cause damage, it is easy for installation, it is ensured that the air-tightness of motor.When system goes wrong, dimension
Repair also very convenient.
3rd, staff can set multiple acceleration transducers on motor housing end according to actual needs, so that it may
To approximate one complete end winding vibration situation of stator winding end, accurately, positioning precision is high, vibration source position for vibration source monitoring
And the Oscillation Amplitude of winding overhang can show in real time over the display.
Brief description of the drawings
Fig. 1 is the structural representation of Generator Stator Winding Ends vibration monitor system of the present invention.
Fig. 2 is the first acceleration transducer spot distribution schematic diagram of the invention.
Fig. 3 is the scheme of installation of distributed fiberoptic sensor of the present invention.
Fig. 4 is the flow chart of Generator Stator Winding Ends vibration monitoring method of the present invention.
The concrete meaning of label is in figure：1 is generator, and 2 is the first acceleration transducer, and 3 is cabinet, and 4 is display
Device, 5 is industrial computer, and 6 is monitoring host computer, and 7 is generator end shell, and 8 is cable signal line.
Specific embodiment
Specific embodiment of the invention is illustrated below in conjunction with the accompanying drawings.
Referring to Fig. 1, Fig. 2, Generator Stator Winding Ends vibration monitor system of the invention, including generator 1, Duo Ge
One acceleration transducer 2, cabinet 3.Display 4, industrial computer 5, monitoring host computer 6 are sequentially installed with from top to bottom in the cabinet 3.
First acceleration transducer 2 is used to gather the Oscillation Amplitude of generator end shell 7, can be sensed using piezoelectric type acceleration
Device, electromagnetic acceleration sensor or distributed fiberoptic sensor.When the first acceleration transducer 2 is passed using piezoelectric type acceleration
When sensor or electromagnetic acceleration sensor, by pasting or bolt spot distribution is in the vapour end of generator 1 and excitation end housing
On radial circumference.When the first acceleration transducer 2 uses distributed fiberoptic sensor, as shown in figure 4, being wrapped in generator vapour end
On the shell at excitation end, the distribution density of the sampled point of distributed fiberoptic sensor is higher than spotted array, in use,
Sampled point can be increased by winding multi-turn, so as to improve sampling precision.
Motor stator End winding be one overarm arm configuration, when End winding produce vibration after, vibration by stator around
Group, stator core these media are transferred to generator casing.First acceleration transducer 2 gathers the vibration signal of end enclosure 7,
And vibration signal is passed to by monitoring host computer 6 by cable signal line 8, monitoring host computer 6 is calculated according to the vibration signal for receiving
The Oscillation Amplitude of End winding, stores to vibration data, and passes data to industrial computer 5, and industrial computer 5 is by installation
The vibration data of End winding is passed to display 4 by monitoring software to carry out visualization and shows.
During vibration signal is transferred to generator casing by stator winding, stator core these media, exists and shake
The phenomenon of width decay, by obtaining the associated data of amplitude damping factor and inside and outside amplitude, can be by the vibration width of end enclosure 7
Degree calculates the Oscillation Amplitude of End winding.Generator Stator Winding Ends vibration monitor system of the invention is to End winding
Vibration be monitored during, specifically include following monitoring step：
Step 1：Build generator vibration source Oscillation Amplitude database；
The vibration source Oscillation Amplitude database of the structure refers to after carrying out multiple excited vibration experiment to the End winding of generator,
Vibration attenuation coefficient and the statistics between end enclosure Oscillation Amplitude, End winding Oscillation Amplitude for being drawn.
The structure vibration source Oscillation Amplitude database specifically includes following steps：
Step 1.1：Carried out when excited vibration is tested, it is necessary to fixed multiple first acceleration on stator end shell in winding bar
Degree sensor, fixed multiple clock orientation the second acceleration sensings of identical with the first acceleration transducer on End winding
Device；
Step 1.2：Using a clock orientation of impact power hammer excitation winding bar, it is 200HZ winding bar is produced frequency
Following vibration signal, vibration signal is gathered by the first acceleration transducer and the second acceleration transducer simultaneously, and first accelerates
Degree sensor detects the first amplitude of end enclosure, and the second acceleration transducer detects the second amplitude of End winding, according to interior
Outer amplitude-frequency response formula, the first amplitude, the second amplitude can calculate the vibration attenuation coefficient in the clock orientation；
Amplitude-frequency response formula is inside and outside described, wherein A1 is the first amplitude of End winding,
A2 is the second amplitude of end enclosure, and Q is vibration attenuation coefficient, and v is the spread speed of vibration signal, and f is 50HZ or 100HZ,
x2-x1It is the distance of any one acceleration transducer to vibration source.
Step 1.3：From the different clocks orientation of winding bar, step 1.2 is repeated several times, can obtain multigroup excited vibration examination
The experimental data tested, the first amplitude obtained to test of many times, the second amplitude and corresponding vibration attenuation coefficient are carried out
Data statistics, builds Oscillation Amplitude database；
As shown in Fig. 2 the first acceleration transducer shown in figure is 8, a is numbered to it respectively along clockwise direction,
B, c, d, e, f, g, h, to excitation F1 is applied on the winding bar between c and d, the position of excitation F1 is the position of vibration source
Put.Vibration signal is gathered by the first acceleration transducer and the second acceleration transducer respectively, the detection of the first acceleration transducer
The first amplitude for arriving is A1, and the second amplitude that the second acceleration transducer is detected is A2, it is assumed that the distance of sensor a to vibration source
It is a2-x1.By the first amplitude be A1, the second amplitude be A2, sensor a to vibration source apart from x2-x1Substitute into inside and outside amplitude-frequency response public
Formula, can obtain the vibration attenuation coefficient Q of vibration source F1, using the first amplitude be A1, the second amplitude be A2 and vibration attenuation coefficient Q as
One group of experimental data.
Then, to excitation f ' is applied on the winding bar between b and c, repeat to operate above, another group of reality can be obtained
Test data.Above operation is repeated several times, the experimental data of multigroup excited vibration experiment is can obtain, to the first of multigroup experimental data
Amplitude, the second amplitude and corresponding vibration attenuation coefficient carry out data statistics, build Oscillation Amplitude database.
Step 1.4：Remove the second acceleration transducer on End winding.
Step 2：In generator operation, when End winding vibrates, vibration signal is by stator winding, stator
Iron core these media are transferred to generator casing, and multiple first acceleration transducers can detect the vibration of stator end shell
Signal, then monitoring host computer determine that the acceleration transducer of any two first detects the sequencing of vibration signal；
In Fig. 2, because c and d has a contest apart from the position of vibration source, vibration signal is gathered by the two sensors first, Ran Houzai
Gathered by b and e, then gathered by a and f, finally gathered by g and h, monitoring host computer can record a, b, c, d, e, f, g, h this 8
Sensor detects the time of vibration signal, can just show that any two sensor detects the time difference of vibration signal.
Step 3：The vibration signal of 50HZ fundamental frequencies that the first acceleration transducer collects and 100HZ frequencys multiplication is extracted, is obtained
First amplitude of stator end shell, according to Oscillation Amplitude database and the first amplitude, can obtain the vibration attenuation coefficient of vibration source；
When generator is run with the frequency of 50Hz, rotor field can cause 100Hz on stator core and stator winding bar
Multiple-frequency vibration, the vibrational energy of generator casing is also concentrated mainly on 50Hz fundamental frequencies and 100Hz frequencys multiplication.Work as stator winding end
Amplitude change, or when occurring the resonance of 100Hz between stator core and stator winding bar, generator casing
50Hz, 100Hz vibromotive force will also must change.Therefore during the Oscillation Amplitude to generator casing is detected,
Need to extract the vibration signal that frequency is 50HZ fundamental frequencies and 100HZ frequencys multiplication, by detecting this kind of vibration signal vibromotive force of frequency
Amplitude of variation, can just learn the Oscillation Amplitude of generator casing.
Step 4：The first amplitude and vibration attenuation coefficient obtained according to step 3, are calculated by inside and outside amplitude-frequency response formula
Go out the second amplitude of End winding；
Step 5：Judge whether the second amplitude exceedes early warning value, if the second amplitude is more than α μm, monitoring host computer sends alarm signal
And the Oscillation Amplitude of End winding is shown over the display；If the second amplitude more than β μm or the second amplitude changing value more than γ μ
M, then monitoring host computer control generator is out of service and sends alarm signal, and the vibration width of End winding is shown over the display
Degree.
During actual monitoring, the early warning value of the second amplitude can be as needed set, such as be set as 250um, β μ by α μm
M is set as 400um, and γ μm is set as 100um, and when the Oscillation Amplitude of End winding is more than 250um, monitoring host computer can send
Vibration data can be passed to industrial computer by alarm signal, monitoring host computer, and display can be carried out to the Oscillation Amplitude of End winding
Intuitively show very much, to remind staff to note the working condition of generator.When the Oscillation Amplitude of End winding exceedes
When the changing value of 400um or Oscillation Amplitude is more than 100um, monitoring host computer is out of service by Control generator, concurrently
Go out alarm signal to point out staff to be repaired, while showing the Oscillation Amplitude of End winding over the display.Industrial computer
The warning information for sending of the vibration data of generator end winding and monitoring host computer can be stored, in industrial computer
On monitoring software, staff can check the numbers such as vibration time of origin, vibration signal frequency, the Oscillation Amplitude of End winding
According to.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention rather than its limitations；To the greatest extent
Pipe has been described in detail with reference to preferred embodiment to the present invention, and those of ordinary skill in the art should be understood；Still
Specific embodiment of the invention can be modified or equivalent is carried out to some technical characteristics；Without deviating from this hair
The spirit of bright technical scheme, it all should cover in the middle of claimed technical scheme scope of the invention.
Claims (7)
1. a kind of Generator Stator Winding Ends vibration monitor system, it is characterised in that including generator, multiple send out for detecting
Display is disposed with from top to bottom in first acceleration transducer, the cabinet of motor end case vibration amplitude, the cabinet
Device, industrial computer, monitoring host computer, radially circumferencial direction is fixed on generator vapour end and excitation end to first acceleration transducer
Shell on, the vibration signal of end enclosure is passed to monitoring host computer by the first acceleration transducer by cable signal line, prison
Control main frame calculates the Oscillation Amplitude of End winding and vibration data is passed into industrial computer, industry control according to the vibration signal for receiving
The vibration data of End winding is passed to display by machine to carry out visualization and shows.
2. Generator Stator Winding Ends vibration monitor system according to claim 1, it is characterised in that described first plus
Velocity sensor uses piezoelectric acceleration transducer or electromagnetic acceleration sensor, is uniformly fixed on by stickup or bolt
On generator vapour end and excitation end housing.
3. Generator Stator Winding Ends vibration monitor system according to claim 1, it is characterised in that described first plus
Velocity sensor uses distributed fiberoptic sensor, is wrapped on the shell at generator vapour end and excitation end.
4. a kind of Generator Stator Winding Ends vibration monitoring method, it is characterised in that specifically include following steps：
Step 1：Build the Oscillation Amplitude database of generator vibration source；
Step 2：First acceleration transducer detects the vibration signal of stator end shell, and monitoring host computer determines any two first
Acceleration transducer detects the sequencing of vibration signal；
Step 3：The vibration signal of 50HZ fundamental frequencies that the first acceleration transducer collects and 100HZ frequencys multiplication is extracted, stator is obtained
First amplitude of end enclosure, according to Oscillation Amplitude database, the first amplitude, obtains the vibration attenuation coefficient of vibration source；
Step 4：The second amplitude of End winding is calculated according to inside and outside amplitude-frequency response formula；
Step 5：Judge whether the second amplitude exceedes early warning value, if the second amplitude is more than α μm, monitoring host computer sends alarm signal
And the Oscillation Amplitude of End winding is shown over the display；If the second amplitude is more than β μm, monitoring host computer control generator stops
Alarm signal is run and sent, the Oscillation Amplitude of End winding is shown over the display.
5. Generator Stator Winding Ends vibration monitoring method according to claim 4, it is characterised in that the step 1
It is middle to build concretely comprising the following steps for Oscillation Amplitude database：
Step 1.1：Multiple first acceleration transducers are fixed on generator end shell, on End winding it is fixed multiple with
Clock orientation second acceleration transducer of identical of the first acceleration transducer；
Step 1.2：Using a clock orientation of impact power hammer excitation winding bar, it is 200HZ winding bar is produced frequency
Following vibration signal, the first acceleration transducer detects the first amplitude, and the second acceleration transducer detects the second amplitude, according to
Inside and outside amplitude-frequency response formula, the first amplitude, the second amplitude meter calculate the vibration attenuation coefficient in the clock orientation；
Step 1.3：Step 1.2 is repeated several times, line number is entered to the first amplitude, the second amplitude and corresponding vibration attenuation coefficient
According to statistics, Oscillation Amplitude database is built；
Step 1.4：Remove the second acceleration transducer on End winding.
6. the Generator Stator Winding Ends vibration monitoring method according to claim 4 or 5, it is characterised in that in described
Outer amplitude-frequency response formula is, wherein A1 is the first amplitude of End winding, and A2 is outside end
Second amplitude of shell, Q is vibration attenuation coefficient, and v is the spread speed of vibration signal, and f is 50HZ or 100HZ, x2-x1For any
Distance of one the first acceleration transducer to vibration source.
7. Generator Stator Winding Ends vibration monitoring method according to claim 4, it is characterised in that the step 5
In, if the changing value of the second amplitude is more than γ μm, monitoring host computer control generator is out of service and sends alarm signal.
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| CN201611167783.8A CN106768274B (en) | 2016-12-16 | 2016-12-16 | Generator stator winding end vibration monitoring system and monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611167783.8A CN106768274B (en) | 2016-12-16 | 2016-12-16 | Generator stator winding end vibration monitoring system and monitoring method |
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| CN106768274A true CN106768274A (en) | 2017-05-31 |
| CN106768274B CN106768274B (en) | 2021-11-30 |
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Cited By (2)
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| CN112130067A (en) * | 2020-09-02 | 2020-12-25 | 国网天津市电力公司电力科学研究院 | Online monitoring system and monitoring identification method for magnetic leakage fault of large generator |
| CN112130067B (en) * | 2020-09-02 | 2024-04-23 | 国网天津市电力公司电力科学研究院 | Large-scale generator magnetic flux leakage fault on-line monitoring system and monitoring identification method |
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| CN112130067A (en) * | 2020-09-02 | 2020-12-25 | 国网天津市电力公司电力科学研究院 | Online monitoring system and monitoring identification method for magnetic leakage fault of large generator |
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| Publication number | Publication date |
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| CN106768274B (en) | 2021-11-30 |
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