CN1442683A - Large power generator stator winding terminal part vibration on line monitoring method - Google Patents
Large power generator stator winding terminal part vibration on line monitoring method Download PDFInfo
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- CN1442683A CN1442683A CN 03116459 CN03116459A CN1442683A CN 1442683 A CN1442683 A CN 1442683A CN 03116459 CN03116459 CN 03116459 CN 03116459 A CN03116459 A CN 03116459A CN 1442683 A CN1442683 A CN 1442683A
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Abstract
An in-line monitoring method for the end vibration of stator windings of large electric generator is based on the resonance characteristics of optical quartz fibre. An optical fibre probe for detecting resonance is arranged at the end of said stator winding. In said probe ,the vibrating fibre is coupled to external light source and the imaging fibre cluster is coupled to external CCD cameral head. The vibration image is received by said CCD camera head and then processed by computer to obtain the amplitude and direction of vibration.
Description
Technical field:
The present invention relates to a kind of high-rating generator stator winding end portion vibration on-line monitoring method, utilize the resonance characteristics of silica fibre, adopt the vibration situation of optical fiber resonance probe on-line monitoring high-rating generator stator winding end, belong to photoelectron measuring technique class field.
Background technology:
High-rating generator is because the characteristic of its big workload and continuous operations makes the internal stator of generator be easy to produce various faults, because inner high voltage (near 20,000 volts) and high-intensity magnetic field make that common detection technique is difficult to use.Generator factory can only carry out some basic maintenance works under the condition of not knowing the generator inner case, in order to prevent major accident, will carry out maintenance out of service in domestic general about 3 years.If high-rating generator is shut down maintenance at present, whenever stop 300,000 kilowatts of abilities of loss in a hour (300,000 degree), kilowatt-hour will lose 4,320,000 yuan every day in 0.6 yuan, promptly lose up to ten million yuans in 2～3 days.
Therefore seek a kind of brand-new Detection Techniques and seem particularly important, can make our damaged condition in the understanding generator generator unit stator is keeped in repair and replaces before of having an opportunity like this, and carry out suitable adjustment.Data by a period of time that detection system is obtained are edited and are compared with other data, the operation conditions of estimation generator that can be more deep, adjust maintenance schedule to improve the maintenance level of motor for formulating, thereby accomplish to shoot the arrow at the target, the efficiency of operation that improves generator is significant.
The product of the U.S. " about continuing the method for quantitative optical fiber vialog amplitude ", U.S. Patent number 5146776.It adopts two independently optical fiber axes alignments, between two optical fiber, place the resonance copper sheet, the resonance copper sheet links to each other with a grating, extraneous vibration causes the resonance of resonance copper sheet, drive grating vibration, receive optical fiber and will receive the periodic wave motion video, be i.e. the spaced oscillogram of density, by the situation of analytical cycle and crest, trough, can obtain the size of extraneous vibration amplitude.But there is obvious defects in this patented technology, because its use is grating, its sensitivity is not high.The generator unit stator vibration measuring system that utilizes this technology to make can not survey 10
-5The vibration of meter level also can not get the direction vibrated, and its receiving equipment is too complicated, uses inconvenience, is unfavorable for the analytic record of computing machine.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of high-rating generator stator winding end portion vibration on-line monitoring method is provided, simple, measure accurately reliably, satisfy pressing for of the online detection of high-rating generator.
For realizing such purpose, the present invention has utilized the resonance characteristics of silica fibre, at the generator unit stator winding overhang optical fiber resonance probe is installed, one end of optical fiber resonance probe is drawn vibration optical fiber and is connected external light source, the other end is that optical fiber image transmission beam connects outside CCD camera, and the CCD camera sends the generator unit stator basket vibration information that receives to computing machine and carries out analyzing and processing.
Silica fibre has elasticity, fixes and the other end when being free end when an end, and its vibration has fixing frequency, is cantilever beam structure.Therefore, for the uniform cross section optical fiber of different density and length, just can calculate its intrinsic vibration frequency.Optical fiber can resonate under hormetic effect, and the size of amplitude is relevant with both frequencies, when driving frequency is identical with the optical fiber fundamental frequency, and the amplitude maximum, the direction of vibration of optical fiber is with hormetic direction of vibration unanimity.The present invention has designed the optical fiber resonance probe according to this principle; the LASER Light Source of the fixedly termination input of its vibration optical fiber; at its free end placement optical fiber image transmission beam that is spaced a distance, the outside adds the resonance probe protective sleeve, and will resonate optical fiber and fibre optic image transmission beam images receiving end are fixed together.
According to the simulation to the generator unit vibration, normal condition issues the amplitude stability of motor stator winding end portion vibration, and the frequency of vibration is a fixed value.When genset occurs when unusual, the vibration amplitude of generator unit stator winding overhang can change and frequency is constant.Therefore, it is feasible utilizing detection method of the present invention.
When genset ran well, optical fiber produced resonance with the stator of generator, because the direction of vibration of generator unit stator fixes, so the free end of optical fiber will produce the one dimension vibration, and has certain amplitude.When the optical fiber stiff end input light time, the light that spreads out of at the optical fiber free end will form the direct light line of a stable length.When the amplitude of generator became big, free end was also just elongated accordingly because of the light length that vibration produces.Known the critical amplitudes of generator, just can obtain the critical length of corresponding light by the optical fiber resonance system.
When the optical fiber free end was static, at the center of optical fiber image transmission beam, did circular by optical fiber image transmission beam through focal imaging for the light in the optical fiber.When vibration optical fiber when static, luminous point is positioned at the center of circle of optical fiber image transmission beam, no matter the direction of fiber-optic vibration how like this, receiving at optical fiber image transmission beam can symmetrical direct light line through the center of circle of formation on the end face.The vibration of the length of this direct light line and direction and generator is related.When the generator steady operation, amplitude is little, and the direct light line of formation can not surpass critical length.When the generator vibration became big, the light that forms on the optical fiber image transmission beam end face is just corresponding to become big.The direction of light has reflected the direction of vibration of stator simultaneously.When generator vibrated the amplitude that surpasses under the critical abnormality, the light length on the optical fiber image transmission beam end face just surpassed critical ray length, will be reported to the police by computer-controlled image capture device.Like this, just can monitor in real time the vibration situation of generator unit stator winding overhang.
The optical fiber resonance probe that the present invention adopts has simplicity of design, and cost is low, and highly sensitive advantage can not be subjected to the interference of strong-electromagnetic field, very is fit to measure the vibration of generator unit stator winding overhang, and can measure the direction of vibration of stator winding end.Computer control can detect the vibration situation of generator unit stator winding overhang in real time, by long-term data recording and data contrast, can understand any during in the ruuning situation of generator unit stator winding overhang, thereby solved the fixedly economic loss brought of inspection and repair shop of generator, had a very big market application foreground.
Description of drawings:
Fig. 1 carries out generator unit stator winding overhang vibrational state on-line monitoring synoptic diagram for the present invention.
Fig. 2 is an optical fiber resonance sonde configuration synoptic diagram.
Among Fig. 2,1 is vibration optical fiber, and 2 is the resonance probe protective sleeve, and 3 is optical fiber image transmission beam, and 4 is the CCD camera.
The fiber-optic vibration figure that Fig. 3 arrives for the CCD camera collection.
Embodiment:
Below in conjunction with accompanying drawing technical scheme of the present invention is further described.
The flow process that the method that the present invention utilizes optical fiber resonance is carried out on-line monitoring to the vibrational state of generator unit stator winding overhang as shown in Figure 1.At the generator unit stator winding overhang optical fiber resonance probe is installed, the structure of optical fiber resonance probe and transmission principle are as shown in Figure 2.In the optical fiber resonance probe; the stiff end of vibration optical fiber 1 is drawn the connection external light source; be spaced a distance with vibration optical fiber free end and place round fiber coherent fiber bundle 3, will the resonate image receiving end of optical fiber 1 and optical fiber image transmission beam 3 of resonance probe protective sleeve 2 is fixed together.Optical fiber image transmission beam 3 connects outside CCD camera 4, and the CCD camera sends the generator unit stator basket vibration information that receives to computing machine and carries out analyzing and processing.
The natural frequency of vibration optical fiber 1 is 100Hz, and is consistent for fixing 100Hz with the stator winding end frequency of generator.Be positioned over place away from the generator strong-electromagnetic field as the laser instrument of light source, the light that laser instrument sends is gone into the optical fiber resonance probe by the multimode optical fiber transmission is laggard, and spreads out of generator inside by optical fiber image transmission beam.
At outer setting CCD camera, receive the image that optical fiber image transmission beam spreads out of in the optical fiber resonance probe away from generator inside strong-electromagnetic field.
The fiber-optic vibration image that the CCD camera receives send computing machine to carry out the image post-processed as shown in Figure 3, obtains the size and Orientation about the vibration of generator unit stator winding overhang, and reports to the police under abnormal conditions, and the data storage after the processing is in computing machine.
When generator is worked, the stator winding end portion vibration of generator, vibration frequency is fixing 100Hz, to make it natural frequency be 100Hz to the vibration optical fiber 1 in the resonance probe by choosing suitable length, therefore the silica fibre in the resonance probe just resonates, and forms a straight bright light rays.The length of light has reflected the size of generator unit stator winding overhang vibration, and direction has reflected the direction of vibration of stator winding end.This light that comprises generator unit stator winding overhang vibration information spreads out of generator inside through optical fiber image transmission beam 3,
Receive the fiber-optic vibration images and image is delivered to computing machine handle at CCD camera 4 away from generator inside strong-electromagnetic field.Image pick-up card is housed in the computing machine, by coding, the length and the direction of the light that obtains are handled, the thickness of light is not then considered, so just obtain the size and Orientation about the vibration of generator unit stator winding overhang, computing machine just can be reported to the police under abnormal conditions.Data storage after the processing is in computing machine.So not only can obtain the real-time vibration situation of generator unit stator, and, the data of a period of time that can also obtain detection system are edited and are compared with other data, thereby the operation conditions of estimation generator that can be more deep, improve the maintainability of generator, thereby accomplish to shoot the arrow at the target, improve the efficiency of operation of generator.
Under the vibration frequency of shaking table 100Hz, the present invention can measure 1*10
-5Little vibration of m; By the installation experimental verification on 300,000 kilowatts of generator unit stators, the present invention has measured the size of generator unit stator winding overhang vibration, and has obtained the direction of vibration of stator.
Claims (1)
1, a kind of high-rating generator stator winding end portion vibration on-line monitoring method, it is characterized in that comprising: an optical fiber resonance probe is installed at the generator unit stator winding overhang, vibrate the stiff end of optical fiber (1) in the optical fiber resonance probe and draw the connection external light source, round fiber coherent fiber bundle (3) connects outside CCD camera, the natural frequency of vibration optical fiber (1) is consistent with the stator winding end fixed frequency of generator, light source and CCD camera are away from the generator strong-electromagnetic field, the CCD camera receives the fiber-optic vibration image that optical fiber image transmission beam (3) spreads out of, and send computing machine to carry out the image post-processed, obtain size and Orientation about the vibration of generator unit stator winding overhang, and under abnormal conditions, report to the police, the data storage after the processing is in computing machine.
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| CN 03116459 CN1442683A (en) | 2003-04-17 | 2003-04-17 | Large power generator stator winding terminal part vibration on line monitoring method |
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| CN 03116459 CN1442683A (en) | 2003-04-17 | 2003-04-17 | Large power generator stator winding terminal part vibration on line monitoring method |
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| US7916038B2 (en) | 2007-05-24 | 2011-03-29 | Cutsforth Products, Inc. | Monitoring systems and methods for monitoring the condition of one or more components of an electrical device |
| CN103090962A (en) * | 2013-01-06 | 2013-05-08 | 北京信息科技大学 | Method for identifying degradation on generator stator winding end portion through vibration of transformer winding |
| CN103185670A (en) * | 2011-12-28 | 2013-07-03 | 三菱重工业株式会社 | Impact load monitoring system and impact load monitoring method for wind turbine for wind power generation |
| AU2008256639B2 (en) * | 2007-05-24 | 2014-02-06 | Cutsforth, Inc. | Brush holder assembly monitoring system and method |
| CN104101610A (en) * | 2013-04-11 | 2014-10-15 | 通用电气公司 | Detection system and method thereof |
| CN105745523A (en) * | 2013-09-12 | 2016-07-06 | 康宁股份有限公司 | Systems and methods for inspecting wound optical fiber |
| CN105865730A (en) * | 2016-03-24 | 2016-08-17 | 航天科技控股集团股份有限公司 | Adaptive tuning vibration table and detection method |
| WO2016127486A1 (en) * | 2015-02-13 | 2016-08-18 | 福州大学 | High-speed multi-dimensional vibration measurement apparatus and method based on stripe target |
| CN106225683A (en) * | 2016-08-22 | 2016-12-14 | 国家电网公司 | Vertical hydrogenerator stator silicon steel plate radial displacement detection method |
| US10031331B2 (en) | 2013-07-09 | 2018-07-24 | General Electric Company | Inspection apparatus guide system |
| CN109479085A (en) * | 2016-05-31 | 2019-03-15 | 特伊亚集团股份有限公司 | Transmission and digitization system for machine telemetering |
| US10348047B2 (en) | 2015-06-01 | 2019-07-09 | Cutsforth, Inc. | Brush wear and vibration monitoring |
| US10371726B2 (en) | 2016-01-11 | 2019-08-06 | Cutsforth, Inc. | Monitoring system for grounding apparatus |
| CN111682712A (en) * | 2020-06-29 | 2020-09-18 | 哈尔滨电机厂有限责任公司 | On-site installation method of large generator end vibration monitoring device |
| US11211757B2 (en) | 2018-10-04 | 2021-12-28 | Cutsforth, Inc. | System and method for monitoring the status of one or more components of an electrical machine |
| US11355991B2 (en) | 2018-10-04 | 2022-06-07 | Cutsforth, Inc. | System and method for monitoring the status of one or more components of an electrical machine |
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- 2003-04-17 CN CN 03116459 patent/CN1442683A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AU2008256641C1 (en) * | 2007-05-24 | 2014-02-27 | Cutsforth, Inc. | Monitoring systems and methods for monitoring the condition of one or more components of an electrical device |
| US8134472B2 (en) | 2007-05-24 | 2012-03-13 | Cutsforth Products, Inc. | Monitoring systems and methods for monitoring the condition of one or more components of an electrical device |
| AU2008256641B2 (en) * | 2007-05-24 | 2012-12-06 | Cutsforth, Inc. | Monitoring systems and methods for monitoring the condition of one or more components of an electrical device |
| US7916038B2 (en) | 2007-05-24 | 2011-03-29 | Cutsforth Products, Inc. | Monitoring systems and methods for monitoring the condition of one or more components of an electrical device |
| AU2008256639B2 (en) * | 2007-05-24 | 2014-02-06 | Cutsforth, Inc. | Brush holder assembly monitoring system and method |
| CN103185670A (en) * | 2011-12-28 | 2013-07-03 | 三菱重工业株式会社 | Impact load monitoring system and impact load monitoring method for wind turbine for wind power generation |
| CN103090962B (en) * | 2013-01-06 | 2014-10-29 | 北京信息科技大学 | Method for identifying degradation on generator stator winding end portion through vibration of transformer winding |
| CN103090962A (en) * | 2013-01-06 | 2013-05-08 | 北京信息科技大学 | Method for identifying degradation on generator stator winding end portion through vibration of transformer winding |
| CN104101610A (en) * | 2013-04-11 | 2014-10-15 | 通用电气公司 | Detection system and method thereof |
| US10031331B2 (en) | 2013-07-09 | 2018-07-24 | General Electric Company | Inspection apparatus guide system |
| CN105745523A (en) * | 2013-09-12 | 2016-07-06 | 康宁股份有限公司 | Systems and methods for inspecting wound optical fiber |
| CN105745523B (en) * | 2013-09-12 | 2020-01-14 | 康宁股份有限公司 | System and method for inspecting wound optical fiber |
| WO2016127486A1 (en) * | 2015-02-13 | 2016-08-18 | 福州大学 | High-speed multi-dimensional vibration measurement apparatus and method based on stripe target |
| US10348047B2 (en) | 2015-06-01 | 2019-07-09 | Cutsforth, Inc. | Brush wear and vibration monitoring |
| US11050205B2 (en) | 2015-06-01 | 2021-06-29 | Cutsforth, Inc. | Brush wear and vibration monitoring |
| US10649011B2 (en) | 2016-01-11 | 2020-05-12 | Cutsforth, Inc. | Monitoring system for grounding apparatus |
| US10371726B2 (en) | 2016-01-11 | 2019-08-06 | Cutsforth, Inc. | Monitoring system for grounding apparatus |
| CN105865730B (en) * | 2016-03-24 | 2018-09-28 | 航天科技控股集团股份有限公司 | A kind of self-adapting tuning shake table and detection method |
| CN105865730A (en) * | 2016-03-24 | 2016-08-17 | 航天科技控股集团股份有限公司 | Adaptive tuning vibration table and detection method |
| CN109479085A (en) * | 2016-05-31 | 2019-03-15 | 特伊亚集团股份有限公司 | Transmission and digitization system for machine telemetering |
| CN106225683B (en) * | 2016-08-22 | 2019-02-22 | 国家电网公司 | Vertical hydrogenerator stator silicon steel plate radial displacement detection method |
| CN106225683A (en) * | 2016-08-22 | 2016-12-14 | 国家电网公司 | Vertical hydrogenerator stator silicon steel plate radial displacement detection method |
| US11211757B2 (en) | 2018-10-04 | 2021-12-28 | Cutsforth, Inc. | System and method for monitoring the status of one or more components of an electrical machine |
| US11355991B2 (en) | 2018-10-04 | 2022-06-07 | Cutsforth, Inc. | System and method for monitoring the status of one or more components of an electrical machine |
| US11616413B2 (en) | 2018-10-04 | 2023-03-28 | Cutsforth, Inc. | System and method for monitoring the status of one or more components of an electrical machine |
| US11949314B2 (en) | 2018-10-04 | 2024-04-02 | Cutsforth, Inc. | System and method for monitoring the status of one or more components of an electrical machine |
| US12003067B2 (en) | 2018-10-04 | 2024-06-04 | Cutsforth, Inc. | System and method for monitoring the status of one or more components of an electrical machine |
| CN111682712A (en) * | 2020-06-29 | 2020-09-18 | 哈尔滨电机厂有限责任公司 | On-site installation method of large generator end vibration monitoring device |
| CN111682712B (en) * | 2020-06-29 | 2022-03-11 | 哈尔滨电机厂有限责任公司 | On-site installation method of large generator end vibration monitoring device |
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