CN103630231B - A kind of spectral characteristic test method of generator stator core clamping ring - Google Patents
A kind of spectral characteristic test method of generator stator core clamping ring Download PDFInfo
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- CN103630231B CN103630231B CN201310520746.0A CN201310520746A CN103630231B CN 103630231 B CN103630231 B CN 103630231B CN 201310520746 A CN201310520746 A CN 201310520746A CN 103630231 B CN103630231 B CN 103630231B
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Abstract
The invention provides a kind of spectral characteristic test method of generator stator core clamping ring, first assemble vertical vertically to stator core and support bar, support bar is located at outside stator core, and clamping ring to be located at outside support bar and coaxially to be arranged with stator core, by clamping ring butt welding; Again clamping ring is welded with support bar and terminate and turn over to horizontal level; Then adopt the spectral characteristic of test point on mould measurement testing of equipment clamping ring, test point is: on clamping ring upper semi-circle, the line same level wire clamp angle in the left and right sides and the clamping ring center of circle is the position of 40 °; The assessment criteria whether qualified according to stator core clamping ring spectral characteristic judges that whether qualified stator core clamping ring spectral characteristic is.Method provided by the invention overcomes the deficiencies in the prior art, the rationality of clamp ring design Structure and energy process can be verified, be conducive to improving the designing quality of product, reduce technique dispersed, thus ensure that clamping ring is radial and fasteningly put in place and meet generator operation requirement.
Description
Technical field
The present invention relates to a kind of spectral characteristic test method of generator stator core clamping ring, belong to electric generator structure characteristic technical field.
Background technology
After Generator Stator closed assembly unshakable in one's determination completes, need, with clamping ring, radial direction is carried out in stator core and be fastened and fixed.The quality of the radial fastening performance of clamping ring structure will directly affect performance and the operational reliability of stator core.If clamping ring directly adopts bolt to tighten up, easily loosen after long-time running, need check between overhaul time and tighten up.If clamping ring is directly tightened up by permanent after welding, can be controlled in theory by strict dimensional requirement, but because a large amount of welding can make clamping ring experience distortion and shrink in manufacture process, clamping ring may be caused radial fastening not in place, affect stator core performance and operational reliability.If the fabrication phase does not have reliable detection methods in manufacturing plant, could verify after power plant will be waited to run.If checking existing problems, repair in shop reason will be returned, affect the safety in production of power plant, cause larger economic loss
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of test method for verifying generator stator core clamping ring structure spectral characteristic, thus ensures that clamping ring is radial and fasteningly put in place and meet service requirement.
In order to solve the problems of the technologies described above, technical scheme of the present invention is to provide a kind of spectral characteristic test method of generator stator core clamping ring, it is characterized in that: the method is made up of following 4 steps:
Step 1: assemble vertical vertically to stator core and support bar, support bar is located at outside stator core, clamping ring to be located at outside support bar and coaxially to be arranged with stator core, by clamping ring butt welding; Again clamping ring is welded with support bar and terminate and turn over to horizontal level;
Step 2: the spectral characteristic adopting test point on mould measurement testing of equipment clamping ring, test point is: on clamping ring upper semi-circle, the line same level wire clamp angle in the left and right sides and the clamping ring center of circle is the position of 40 °;
Step 3: formulate the assessment criteria that whether qualified stator core clamping ring spectral characteristic is;
Step 4: according to assessment criteria, the spectral characteristic analyzing test point place on clamping ring, judges that whether qualified stator core clamping ring spectral characteristic is.
Preferably, in described step 1, clamping ring is welded by support muscle by two monocycles.
Preferably, in described step 2, adopt the concrete grammar of the spectral characteristic of test point on mould measurement testing of equipment clamping ring as follows: the test point firmly on hammer excitation clamping ring, measure the acceleration responsive at test point place with acceleration transducer simultaneously, force signal and acceleration signal amplify through amplifier, send into dynamic signal analyzer to analyze, obtain the frequency response function of structure; Then with mould measurement equipment, the frequency response function obtained is analyzed, obtain frequency and the acceleration responsive thereof of clamping ring.
Preferably, in described step 3, assessment criteria is: if the peak acceleration sound of all test points within the scope of 90Hz ~ 115Hz is all less than 0.05m/s on the clamping ring of stator core
2/ N, then stator core clamping ring spectral characteristic is qualified; Otherwise it is defective.
The spectral characteristic test method of generator stator core clamping ring provided by the invention has stronger operability and practicality, is tested, worked out the spectral characteristic assessment criteria of clamping ring ad-hoc location by the spectral characteristic of a large amount of clamping ring diverse location; The rationality of clamp ring design Structure and energy process can either be verified according to assessment criteria, be conducive to the designing quality and the minimizing technique dispersiveness that improve product, effectively can predict again whether the spectral characteristic of generator stator core clamping ring meets the requirement of the safe and reliable operation of generator.
Method provided by the invention overcomes the deficiencies in the prior art, the rationality of clamp ring design Structure and energy process can be verified, be conducive to improving the designing quality of product, reduce technique dispersed, thus ensure that clamping ring is radial and fasteningly put in place and meet generator operation requirement.
Accompanying drawing explanation
Fig. 1 is certain large-sized turbine generator stator core in the present embodiment, support bar and clamping ring structural representation;
Fig. 2 is point position schematic diagram.
The mould measurement system chart of Fig. 3 for adopting in the present embodiment;
Fig. 4 be test in the present embodiment gained to clamping ring spectral characteristic do not conform to trrellis diagram;
Fig. 5 tests the qualified figure of clamping ring spectral characteristic that gained arrives in the present embodiment.
Embodiment
For making the present invention become apparent, hereby with a preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Fig. 1 is certain large-sized turbine generator stator core, support bar and clamping ring structural representation, is made up of stator core 1, clamping ring 2, support ring 3 and support bar 4, and have four assembling clamping rings 2, each clamping ring is welded by support muscle by two monocycles.When assembling according to product manufacture, assemble in axial direction vertical to stator core 1 and support bar 4, support bar 4 is located at outside stator core 1, clamping ring 2 to be located at outside support bar 4 and coaxially to be arranged with stator core 1, each clamping ring 2 is first docked welding, then clamping ring 2 is welded with each support bar 4, finally support ring 3 is welded with support bar 4, main bearing structure is clamping ring 2, welding terminate and detect a flaw qualified after the axis of total is turned over to horizontal level, or stator core is threaded onto base inner.
According to static calculation situation and the dynamic vibration situation of generator stator core, analyze known through detailed Force Calculation analysis and whole circle frequency measurement, the distortion in upper pinch ring 45 ° of regions is maximum.For this reason, determine that the test point of generator clamping ring spectral characteristic is the clamping ring left and right sides level upwards position of 40 °, as shown in Figure 2, namely on clamping ring 2 upper semi-circle, the line same level wire clamp angle in the left and right sides and clamping ring 2 center of circle is the position of 40 °, the link position of institute's target two support bars 4 and clamping ring 2 in concrete measuring point and Fig. 1, have four clamping rings 2, each clamping ring is welded by two monocycles, 2 measuring points on a monocycle, totally 16 measuring points.
Utilize the mould measurement system shown in Fig. 3, carry out the single-point frequency measurement test of generator clamping ring, the specific measuring point firmly on hammer excitation clamping ring, measures its acceleration responsive with acceleration transducer simultaneously.Force signal and acceleration signal amplify through amplifier, send into dynamic signal analyzer and analyze, obtain the frequency response function of structure; Then with CRAS model analysis software, the frequency response function obtained is analyzed, frequency and the acceleration responsive thereof of clamping ring can be obtained.
For forming the rear spectral characteristic evaluation criteria of stator core clamping ring assembling, need to carry out a large amount of generator stator core clamping ring spectral characteristic tests.Owing to there is the electro-magnetic exciting force of 100Hz when stator core runs, single-point-excitation single-point response method is adopted to carry out the spectrum measurement of stator core clamping ring, with reference to stator core and stator coil end modal test standard, choose the acceleration responsive within the scope of 90Hz ~ 115Hz, the maximum acceleration response of all measuring points is less than 0.05m/s
2/ N, then stator core clamping ring spectral characteristic is qualified.
By carrying out spectral characteristic test, according to assessment criteria mentioned above to generator stator core clamping ring structure: as shown in Figure 4, the maximum acceleration response of measuring point 4 within the scope of 90Hz ~ 115Hz is greater than 0.05m/s to underproof clamping ring spectral characteristic
2/ N, the acceleration responsive of all the other measuring points within the scope of 90Hz ~ 115Hz is less than 0.05m/s
2/ N, therefore its spectral characteristic is defective; As shown in Figure 5, the maximum acceleration response of its all measuring point within the scope of 90Hz ~ 115Hz is all less than 0.05m/s to qualified clamping ring spectral characteristic
2/ N.
Test selected by the present invention and analytical approach have stronger operability and practicality, tested, worked out the spectral characteristic assessment criteria of clamping ring ad-hoc location by the spectral characteristic of a large amount of clamping ring diverse location; The rationality of clamp ring design Structure and energy process can either be verified according to assessment criteria, be conducive to the designing quality and the minimizing technique dispersiveness that improve product, effectively can predict again whether the spectral characteristic of generator stator core clamping ring meets the requirement of the safe and reliable operation of generator.
Claims (4)
1. a spectral characteristic test method for generator stator core clamping ring, is characterized in that: the method is made up of following 4 steps:
Step 1: stator core (1) is assembled with support bar (4) is vertical vertically, support bar (4) is located at stator core (1) outside, clamping ring (2) is located at support bar (4) outside and is coaxially arranged with stator core (1), by clamping ring (2) butt welding; Again clamping ring (2) is welded with support bar (4) and terminate and turn over to horizontal level;
Step 2: the spectral characteristic adopting the upper test point of mould measurement testing of equipment clamping ring (2), test point is: on clamping ring (2) upper semi-circle, the line same level wire clamp angle in the left and right sides and clamping ring (2) center of circle is the position of 40 °;
Step 3: formulate the assessment criteria that whether qualified stator core clamping ring spectral characteristic is;
Step 4: according to assessment criteria, the spectral characteristic analyzing the upper test point place of clamping ring (2), judges that whether qualified stator core clamping ring spectral characteristic is.
2. the spectral characteristic test method of a kind of generator stator core clamping ring as claimed in claim 1, is characterized in that: in described step 1, and clamping ring (2) is welded by support muscle by two monocycles.
3. the spectral characteristic test method of a kind of generator stator core clamping ring as claimed in claim 1, it is characterized in that: in described step 2, adopt the concrete grammar of the spectral characteristic of the upper test point of mould measurement testing of equipment clamping ring (2) as follows: the test point firmly on hammer excitation clamping ring (2), measure the acceleration responsive at test point place with acceleration transducer simultaneously, force signal and acceleration signal amplify through amplifier, send into dynamic signal analyzer to analyze, obtain the frequency response function of structure; Then with mould measurement equipment, the frequency response function obtained is analyzed, obtain frequency and the acceleration responsive thereof of clamping ring.
4. the spectral characteristic test method of a kind of generator stator core clamping ring as claimed in claim 1, it is characterized in that: in described step 3, assessment criteria is: if the upper peak acceleration of all test points within the scope of 90Hz ~ 115Hz of the clamping ring of stator core (2) is all less than 0.05m/s
2/ N, then stator core clamping ring spectral characteristic is qualified; Otherwise it is defective.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310520746.0A CN103630231B (en) | 2013-10-29 | 2013-10-29 | A kind of spectral characteristic test method of generator stator core clamping ring |
Applications Claiming Priority (1)
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| CN201310520746.0A CN103630231B (en) | 2013-10-29 | 2013-10-29 | A kind of spectral characteristic test method of generator stator core clamping ring |
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| CN103630231A CN103630231A (en) | 2014-03-12 |
| CN103630231B true CN103630231B (en) | 2015-10-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101281086B (en) * | 2008-05-20 | 2010-06-09 | 上海电气电站设备有限公司 | Large-sized turbine generator stator core vibrating performance analysis method |
| JP5307448B2 (en) * | 2008-05-20 | 2013-10-02 | 日立三菱水力株式会社 | Rotating electric machine |
| 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 |
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