CN104020001A - Method for detecting loosening of a generator stator slot wedge through Leeb hardness tester - Google Patents
Method for detecting loosening of a generator stator slot wedge through Leeb hardness tester Download PDFInfo
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- CN104020001A CN104020001A CN201410225313.7A CN201410225313A CN104020001A CN 104020001 A CN104020001 A CN 104020001A CN 201410225313 A CN201410225313 A CN 201410225313A CN 104020001 A CN104020001 A CN 104020001A
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- slot wedge
- hardness
- detected
- lee
- generator unit
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Abstract
The invention discloses a method for detecting loosening of a generator stator slot wedge through a Leeb hardness tester, which comprises the following steps: selecting a plurality of detecting points on the surface of a random slot wedge of a slot to be detected; transmitting an impact member to the detecting point through the Leed hardness tester; measuring a rebound speed of the impact member which rebounds after collision with the slot wedge; calculating a Leed hardness value of the slot wedge, which corresponds with the detecting points; obtaining Leed hardness values of the slot wedge, which correspond with all detecting points; calculating an average value of the Leed hardness values of the slot wedge, which correspond with all detecting points; obtaining measurement values of Leeb hardness of all wedge slots in the slot to be detected in a power generator stator; and determining whether the slot wedge to be detected in the power generator stator loosens. According to the method of the invention, loosening state of the slot wedge of the power generator state is quantitatively determined by the Leed hardness tester, thereby improving efficiency in determining loosening state of the slot wedge, and improving accuracy in determining loosening state of the slot wedge.
Description
Technical field
The present invention relates to technical field of nondestructive testing, particularly a kind of method of utilizing Leeb Hardness Tester to detect generator unit stator slot wedge loosening.
Background technology
At present, concerning generating plant, high power capacity, high pressure high temperature turbosets spread all over the country.The slot wedge loosening of Generator Stator easily causes generator stator bar insulation reduce and puncture.Particularly, stator slot wedge produces loosening for a long time under mechanical stress effect, and then causes line rod to produce electric and magnetic oscillation, causes the mechanical wear of bar insulation and the insulation corrosion of the interior electric discharge of groove, leads to generator stator bar insulation breakdown, damages the accident of generator.Therefore,, when generator is overhauled, conventionally need to check the slot wedge loosening situation of generator unit stator.
In prior art, for detection of the method for the slot wedge loosening situation of generator unit stator, be mostly artificial hammering method, the method needs technician to rely on the experience of oneself to judge slot wedge loosening situation, its efficiency is lower, accuracy is poor, and easily causes undetectedly, forms hidden danger.
Summary of the invention
The object of the invention is the above-mentioned defect for prior art, a kind of method of utilizing Leeb Hardness Tester to detect generator unit stator slot wedge loosening is provided.
The method of utilizing Leeb Hardness Tester to detect generator unit stator slot wedge loosening provided by the invention comprises the steps:
S1: for any one groove to be detected of generator unit stator, choose a plurality of check points on the surface of any one slot wedge of this groove to be detected as required;
S2: Leeb Hardness Tester is placed in to any one check point place of this slot wedge, utilizes Leeb Hardness Tester to send impact body to this check point, and measure the emission rate of impact body;
S3: utilize Leeb Hardness Tester apart from this check point 1mm place, measure with this slot wedge collision after the speed of rebounding of the impact body that rebounds;
S4: the lee ' hardness value corresponding with this check point that is calculated this slot wedge by the emission rate of impact body and the speed of rebounding;
S5: all check point repeating said steps S2 of this slot wedge, to described step S4, are obtained to the lee ' hardness value corresponding with all check points this slot wedge;
S6: calculate the mean value of lee ' hardness value corresponding with all check points this slot wedge the measured value of the lee ' hardness using this mean value as this slot wedge;
S7: all slot wedge repeating said steps S1 in this groove to be detected of generator unit stator to described step S6, are obtained to the measured value of the lee ' hardness of all slot wedges in this groove to be detected of generator unit stator;
S8: whether this groove to be detected that judges generator unit stator according to the measured value of the lee ' hardness of all slot wedges in this groove to be detected of generator unit stator is loosening.
Preferably, the computing formula of lee ' hardness value is as follows:
Wherein, HL is lee ' hardness; V
1emission rate for impact body; V
2the speed of rebounding for impact body.
Preferably, in described step S8, if there is the lee ' hardness value of 2 above adjacent slot wedges to be all less than 660 in this groove to be detected of generator unit stator, and the lee ' hardness value of the termination slot wedge of this groove to be detected is less than 700, and this groove to be detected of generator unit stator is loosening.
The present invention has following beneficial effect:
Compare with the artificial hammering method of prior art, method of the present invention utilizes Leeb Hardness Tester quantitatively to judge the loosening situation of generator unit stator slot wedge, thereby can improve the efficiency of judgement slot wedge loosening situation, improve the accuracy of judgement slot wedge loosening situation, effectively prevent the accident that causes generator insulating to damage because of generator unit stator slot wedge loosening, be conducive to improve safety and the economic benefit of genset, and extend the serviceable life of genset.
Accompanying drawing explanation
Fig. 1 detects the process flow diagram of the method for generator unit stator slot wedge loosening for the Leeb Hardness Tester that utilizes that embodiments of the invention provide.
Embodiment
Below in conjunction with drawings and Examples, summary of the invention of the present invention is further described.As shown in Figure 1, the method for utilizing Leeb Hardness Tester to detect generator unit stator slot wedge loosening that the present embodiment provides comprises the steps:
S1: for any one groove to be detected of generator unit stator, choose a plurality of check points on the surface of any one slot wedge of this groove to be detected as required;
S2: Leeb Hardness Tester is placed in to any one check point place of this slot wedge, utilizes Leeb Hardness Tester to send impact body to this check point, and measure the emission rate V of impact body
1; In the present embodiment, the model of Leeb Hardness Tester is for example TL160;
S3: utilize Leeb Hardness Tester apart from this check point 1mm place, measure with this slot wedge collision after the speed of the rebounding V of the impact body that rebounds
2;
S4: by the emission rate V of impact body
1with the speed V that rebounds
2calculate the lee ' hardness value corresponding with this check point of this slot wedge;
The computing formula of lee ' hardness value is as follows:
Wherein, HL is lee ' hardness; V
1emission rate for impact body; V
2the speed of rebounding for impact body;
S5: all check points of this slot wedge are repeated to above-mentioned steps S2 to step S4, obtain the lee ' hardness value corresponding with all check points this slot wedge;
S6: calculate the mean value of lee ' hardness value corresponding with all check points this slot wedge the measured value of the lee ' hardness using this mean value as this slot wedge;
S7: all slot wedges in this groove to be detected of generator unit stator are repeated to above-mentioned steps S1 to step S6, obtain the measured value of the lee ' hardness of all slot wedges in this groove to be detected of generator unit stator;
S8: whether this groove to be detected that judges generator unit stator according to the measured value of the lee ' hardness of all slot wedges in this groove to be detected of generator unit stator is loosening; If there is the lee ' hardness value of 2 above adjacent slot wedges to be all less than 660 in this groove to be detected of generator unit stator, and the lee ' hardness value of the termination slot wedge of this groove to be detected is less than 700, and this groove to be detected of generator unit stator is loosening.
It should be noted that, repeat above-mentioned steps S1 to S8 and can judge that whether all grooves to be detected of generator unit stator are loosening.
Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can record each embodiment on the basis of instructions of the present invention, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (3)
1. utilize Leeb Hardness Tester to detect a method for generator unit stator slot wedge loosening, it is characterized in that, the method comprises the steps:
S1: for any one groove to be detected of generator unit stator, choose a plurality of check points on the surface of any one slot wedge of this groove to be detected as required;
S2: Leeb Hardness Tester is placed in to any one check point place of this slot wedge, utilizes Leeb Hardness Tester to send impact body to this check point, and measure the emission rate of impact body;
S3: utilize Leeb Hardness Tester apart from this check point 1mm place, measure with this slot wedge collision after the speed of rebounding of the impact body that rebounds;
S4: the lee ' hardness value corresponding with this check point that is calculated this slot wedge by the emission rate of impact body and the speed of rebounding;
S5: all check point repeating said steps S2 of this slot wedge, to described step S4, are obtained to the lee ' hardness value corresponding with all check points this slot wedge;
S6: calculate the mean value of lee ' hardness value corresponding with all check points this slot wedge the measured value of the lee ' hardness using this mean value as this slot wedge;
S7: all slot wedge repeating said steps S1 in this groove to be detected of generator unit stator to described step S6, are obtained to the measured value of the lee ' hardness of all slot wedges in this groove to be detected of generator unit stator;
S8: whether this slot wedge to be detected that judges generator unit stator according to the measured value of the lee ' hardness of all slot wedges in this groove to be detected of generator unit stator is loosening.
2. the method for utilizing Leeb Hardness Tester to detect generator unit stator slot wedge loosening according to claim 1, is characterized in that, the computing formula of lee ' hardness value is as follows:
Wherein, HL is lee ' hardness; V
1emission rate for impact body; V
2the speed of rebounding for impact body.
3. the method for utilizing Leeb Hardness Tester to detect generator unit stator slot wedge loosening according to claim 1, it is characterized in that, in described step S8, if there is the lee ' hardness value of 2 above adjacent slot wedges to be all less than 660 in this groove to be detected of generator unit stator, and the lee ' hardness value of the termination slot wedge of this groove to be detected is less than 700, this slot wedge loosening to be detected of generator unit stator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410225313.7A CN104020001A (en) | 2014-05-26 | 2014-05-26 | Method for detecting loosening of a generator stator slot wedge through Leeb hardness tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410225313.7A CN104020001A (en) | 2014-05-26 | 2014-05-26 | Method for detecting loosening of a generator stator slot wedge through Leeb hardness tester |
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| CN104020001A true CN104020001A (en) | 2014-09-03 |
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| CN201410225313.7A Pending CN104020001A (en) | 2014-05-26 | 2014-05-26 | Method for detecting loosening of a generator stator slot wedge through Leeb hardness tester |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105387835A (en) * | 2015-11-04 | 2016-03-09 | 上海电气电站设备有限公司 | Power generator stator groove wedge caulking degree intelligent measurement method |
| CN107421730A (en) * | 2017-08-30 | 2017-12-01 | 中广核核电运营有限公司 | Intelligent robot and its method for testing slot wedge elasticity |
| CN109782166A (en) * | 2018-12-19 | 2019-05-21 | 国网内蒙古东部电力有限公司电力科学研究院 | A kind of large size phase modifier stator core automatic test equipment and method |
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|---|---|---|---|---|
| US4962660A (en) * | 1989-06-19 | 1990-10-16 | Westinghouse Electric Corp. | Apparatus for impact testing for electric generator stator wedge tightness |
| US5295388A (en) * | 1992-01-30 | 1994-03-22 | Westinghouse Electric Corp. | Apparatus and method for inpact testing for electric generator stator wedge tightness |
| CN1403793A (en) * | 2002-10-22 | 2003-03-19 | 西安交通大学 | Detection method of loosening slot wedge of rotating motor |
| CN1884990A (en) * | 2006-07-04 | 2006-12-27 | 清华大学深圳研究生院 | Vibrating detection method for detecting looseness of large-scale generator rotor slot wedge and apparatus therefor |
| CN103575601A (en) * | 2013-11-18 | 2014-02-12 | 哈尔滨电机厂有限责任公司 | Method for detecting stator slot wedge of turbonator |
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2014
- 2014-05-26 CN CN201410225313.7A patent/CN104020001A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| US4962660A (en) * | 1989-06-19 | 1990-10-16 | Westinghouse Electric Corp. | Apparatus for impact testing for electric generator stator wedge tightness |
| US5295388A (en) * | 1992-01-30 | 1994-03-22 | Westinghouse Electric Corp. | Apparatus and method for inpact testing for electric generator stator wedge tightness |
| CN1403793A (en) * | 2002-10-22 | 2003-03-19 | 西安交通大学 | Detection method of loosening slot wedge of rotating motor |
| CN1884990A (en) * | 2006-07-04 | 2006-12-27 | 清华大学深圳研究生院 | Vibrating detection method for detecting looseness of large-scale generator rotor slot wedge and apparatus therefor |
| CN103575601A (en) * | 2013-11-18 | 2014-02-12 | 哈尔滨电机厂有限责任公司 | Method for detecting stator slot wedge of turbonator |
Non-Patent Citations (4)
| Title |
|---|
| 彭翔等: "大型发电机定子槽楔松动研究及检测", 《中国电机工程学报》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105387835A (en) * | 2015-11-04 | 2016-03-09 | 上海电气电站设备有限公司 | Power generator stator groove wedge caulking degree intelligent measurement method |
| CN107421730A (en) * | 2017-08-30 | 2017-12-01 | 中广核核电运营有限公司 | Intelligent robot and its method for testing slot wedge elasticity |
| CN109782166A (en) * | 2018-12-19 | 2019-05-21 | 国网内蒙古东部电力有限公司电力科学研究院 | A kind of large size phase modifier stator core automatic test equipment and method |
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