CN201000476Y - An on-line diagnostic instrument for inter-turn short circuit of generator rotor winding - Google Patents
An on-line diagnostic instrument for inter-turn short circuit of generator rotor winding Download PDFInfo
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- CN201000476Y CN201000476Y CNU2007201182017U CN200720118201U CN201000476Y CN 201000476 Y CN201000476 Y CN 201000476Y CN U2007201182017 U CNU2007201182017 U CN U2007201182017U CN 200720118201 U CN200720118201 U CN 200720118201U CN 201000476 Y CN201000476 Y CN 201000476Y
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Abstract
本实用新型涉及信号检测处理技术，特别涉及一种发电机转子绕组匝间短路在线诊断仪，包括数据采集电路和故障判断模块，所述数据采集电路的数据采集端与装设在发电机定子和转子气隙中的探测线圈相连，其输出端与故障判断模块相连。通过本实用新型诊断仪可实时采集并分析气隙探测线圈输出的电压信号，从而实现对发电机多工况条件下全程监控，有利于运行人员对设备故障状态的把握，避免出现重大事故；可在故障出现前进行预测，为发电机状态维修提供技术支持，避免过度维修和维修不足，提高维修的经济性和有效性；可积累设备数据，为设备延寿提供技术支持。本实用新型适用于大型发电机转子绕组匝间短路的诊断。
The utility model relates to signal detection and processing technology, in particular to an on-line diagnostic instrument for inter-turn short circuit of a generator rotor winding, which includes a data acquisition circuit and a fault judgment module. The data acquisition end of the data acquisition circuit is connected to the generator stator and The detection coil in the air gap of the rotor is connected, and its output terminal is connected with the fault judging module. Through the diagnostic instrument of the utility model, the voltage signal output by the air gap detection coil can be collected and analyzed in real time, so as to realize the whole-process monitoring of the generator under multiple working conditions, which is beneficial for the operator to grasp the fault state of the equipment and avoid major accidents; Predict failures before they occur, provide technical support for generator condition maintenance, avoid over-maintenance and under-maintenance, and improve the economy and effectiveness of maintenance; equipment data can be accumulated to provide technical support for equipment life extension. The utility model is suitable for the diagnosis of the short circuit between turns of the rotor winding of a large generator.
Description
Technical field
The utility model relates to the input treatment technology, particularly a kind of generator rotor interturn short-circuit inline diagnosis instrument.
Background technology
In the large electric equipment of generating plant, generator belongs to important key equipment, its safe, stable, economical operation is very big to the achievement influence in power station, therefore, need monitor incessantly under operating condition and its malfunction is carried out real-time analysis and prediction generator.
According to statistics, in the generator that has moved, the proportion that the rotor interturn short-circuit fault accounts for the rotor insulation fault is bigger.The rotor winding exists turn-to-turn short circuit can cause local overheating, forms the rotor ground fault fault at last.In addition, turn-to-turn short circuit causes the rotor heating inequality, rotor bow and the unbalanced magnetic pull of generation.All above these factors will cause that motor oscillating increases, and may make the rotor magnetization, and severe patient also will burn axle journal and bearing are to the very big threat of safe and stable operation formation of unit itself.
It is reported that 1993～1998 years, 2 generators of generating plant, Zhangjiakou recurred the serious turn-to-turn short circuit of rotor winding for 3 times, back burn retaining ring watt is burnt in the insulation under the retaining ring, the rotor macro-axis seriously magnetizes, and retaining ring is scrapped accident.These 3 rotor accident patterns are identical, all are after " rotor one point earth signal " takes place, just to find, and overhauled by forced-stopping machine.If in time judge the rotor inter-turn short circuit fault, can avoid the generation of these accidents.Be example with certain nuclear power station generator accident on March 26th, 2002 again, reach a conclusion by analysis: this also is that typical together turn-to-turn short circuit causes earth fault, and causes and shut down the more serious consequence of exchanging rotor of shutdown, generates electricity by way of merging two or more grid systems up to May 4.
Find out thus, realize that generator rotor insulation fault multi-state on-line monitoring is very necessary.
Summary of the invention
The purpose of this utility model is to provide a kind of generator rotor interturn short-circuit inline diagnosis instrument.
The technical solution of the utility model is: a kind of generator rotor interturn short-circuit inline diagnosis instrument, comprise data acquisition circuit and fault judgement module, the data acquisition end of described data acquisition circuit be installed in generator unit stator and link to each other with detecting coil in the rotor airgap, its output terminal links to each other with the fault judgement module.
Further, described detecting coil is the differential detecting coil.Described fault judgement module comprises that go hot-tempered unit, the unique point that link to each other in turn obtain unit, eigenvalue calculation unit and judging unit.Described fault judgement module also is included in the alarm unit of reporting to the police when turn-to-turn short circuit appears in described judgment unit judges generator amature winding.
As a kind of embodiment of the present utility model, described fault judgement module is a digital signal processor.Described unique point obtains the unit and comprises unique point collecting unit, unique point cluster filter unit, unique point statistical filtering unit and the validity feature point separating filtering unit that links to each other in turn.
Further, described fault judgement module also comprises storage unit.
Can gather and analyze the voltage signal of air gap detecting coil output in real time by the utility model diagnostic equipment, thereby realize complete monitoring under the generator multi-state condition is helped the assurance of operations staff to equipment failure state, avoid occurring major accident; Can before fault occurs, predict,, avoid excessively maintenance and maintenance not enough, improve the economy and the validity of maintenance for the generator state maintenance provides technical support; Can accumulate device data, lengthening the life for equipment provides technical support.The utility model is applicable to the diagnosis of large-scale generator rotor winding interturn short-circuit.
Description of drawings
Fig. 1 is a kind of functional structure chart of generator rotor interturn short-circuit inline diagnosis instrument.
Fig. 2 is a differential detecting coil installation site synoptic diagram among the embodiment.
Fig. 3 is the detecting coil air gap oscillogram that diagnostic equipment is exported when installing as Fig. 2.
Fig. 4 is the air gap oscillogram that the fault order of severity is measured among the embodiment.
Fig. 5 is the air gap oscillogram under the generator zero load among the embodiment.
Embodiment
With specific embodiment the utility model is further elaborated with reference to the accompanying drawings below.
As shown in Figure 1, generator rotor interturn short-circuit inline diagnosis instrument can comprise detecting coil (being fixed in the stator slot wedge), data acquisition circuit 100, A/D change-over circuit 200 and the fault judgement module 300 that is installed in generator unit stator and the rotor airgap.
In the present embodiment, detecting coil adopts the differential detecting coil.For the generator that detecting coil is installed, the data acquisition circuit 100 of the utility model diagnostic equipment can be connected on the output terminal of detecting coil.For the generator that the differential detecting coil is not installed, the differential coil that at first needs coiling to be used to survey, and then be embedded in the generator.Fig. 2 is a differential detecting coil installation site synoptic diagram in the present embodiment.Wherein, label 10 is pole axis, the 11st, and slot leakage flux, the 12nd, extremely preceding groove, the 13rd, coil and groove number, the 14th, groove, the 15th, detecting coil, the 16th, hand over axle.
In the present embodiment, fault judgement module 300 comprises that the denoising unit 301, the unique point that link to each other in turn obtain unit 302, eigenvalue calculation unit 303, judging unit 304, alarm unit 305 and storage unit 306.Unique point obtains unit 302 and comprises unique point collecting unit 308, unique point cluster filter unit 309, unique point statistical filtering unit 310 and the validity feature point separating filtering unit 311 that links to each other in turn.Fault judgement module 300 can be a digital signal processor, as computing machine.
Wherein, denoising unit 301 adopts the undesired signal in the small echo noise-removed technology removal signal, prevents alarm unit 305 by false triggering, guarantees the job stability of the utility model diagnostic equipment under strong interference environment.Unique point collecting unit 308 is used for the signal after the denoising is carried out preliminary filtering, the unique point in the picked up signal.Unique point cluster filter unit 309, unique point statistical filtering unit 310, validity feature point separating filtering unit 311 are used for false unique point is removed, to obtain effective unique point.Eigenvalue calculation unit 303 is used to obtain each unique point characteristic of correspondence value.Judging unit 304 is used for the eigenwert of computation of characteristic values computing unit 303 outputs and the relative mistake of predefined standard feature value, if this relative mistake is greater than a threshold value, then judging unit 304 can be exported an alerting signal road alarm unit 305, and control alarm unit 305 begins to report to the police.Alarm unit 305 can adopt general acousto-optic warning unit 305.Storage unit 306 is responsible for the default standard feature value of storage, also can store the data of eigenvalue calculation unit 303 outputs, inspection and fault analysis after preparing against.
Among other embodiment of the present utility model, the data of A/D change-over circuit 200 outputs can be sent to data the fault judgement module 300 that is arranged on diagnostic center by telecommunication.Among other embodiment of the present utility model, can not comprise A/D change-over circuit 200, the function of A/D conversion is integrated in the fault judgement module 300 and realizes.
The principle of work of the utility model diagnostic equipment is when utilizing rotor interturn short-circuit, rotor winding stray field changes, cause that ampere turns reduces, by the detecting coil of installing, survey stray field and change waveform, simultaneously the rotating magnetic field in the power generator air gap is carried out differential, according to the wave form analysis behind the differential, judge whether the rotor winding exists turn-to-turn short circuit, and show the position of fault groove.Fig. 4 is the comparison diagram of motor non-fault waveform and the back waveform that breaks down in the present embodiment, and wherein to be admitted to the waveform of face be the non-fault waveform in the position, the position by under be the air gap waveform that 2 circles are short-circuited in 6 circles in the rotor winding.
The utility model diagnostic equipment is under generator zero load and three-phase symmetrical short-circuit situation, and Effect on Detecting is more obvious.Fig. 5 is the air gap oscillogram under the generator zero load in the present embodiment.
The failure criterion of a kind of generator rotor interturn short-circuit inline diagnosis of the utility model instrument is: extremely descend the peak value of corresponding groove to ask ratio the peak value and the corresponding S of extremely following certain the groove correspondence of N, then think above a certain scope when ratio to have short circuit phenomenon; Otherwise there is not short circuit phenomenon.According to this principle, the following criterion of getting back, i.e. the ALSTOM criterion of this project employing.
Criterion is: (poor/jack per line coil voltage p-p value the greater of jack per line coil voltage p-p value)＞(the tested groove number of turn of 1/ rotor).The ratio of inequality both sides numerical value has been pointed out degree of short circuit (number of turn) simultaneously.
The fault diagnosis algorithm of a kind of generator rotor interturn short-circuit inline diagnosis of the utility model instrument is as follows:
1. survey the waveform extreme point as unique point, remove noise spot, obtain complete feature point set by filtering method;
2. find corresponding point under the different magnetic poles by registration technology, the mark pole regions is that the coil number A and B and each magnetic pole is under numbered;
3. accurately measure the peak-to-peak value of two sections unique points of each coil, be respectively A
1, A
1', B
1, B
1' etc., and summation A
1+ A
1', B
1+ B
1';
4. calculate A
1+ A
1' and B
1+ B
1' the relative deviation Δ;
5. calculate the D reciprocal of each umber of turn;
6. differentiate, relative deviation value Δ surpasses the D explanation and has the turn-to-turn insulation fault, and the integer approaching with ratio promptly shows the short circuit number of turn, the i.e. order of severity.
Among other embodiment of the present utility model, can intuitively observe the state of each winding, judge whether to exist turn-to-turn short circuit, also can connect printer diagnostic result is printed by the data of this diagnostic equipment of screen display detection.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201182017U CN201000476Y (en) | 2007-01-19 | 2007-01-19 | An on-line diagnostic instrument for inter-turn short circuit of generator rotor winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201182017U CN201000476Y (en) | 2007-01-19 | 2007-01-19 | An on-line diagnostic instrument for inter-turn short circuit of generator rotor winding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201000476Y true CN201000476Y (en) | 2008-01-02 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201182017U Expired - Lifetime CN201000476Y (en) | 2007-01-19 | 2007-01-19 | An on-line diagnostic instrument for inter-turn short circuit of generator rotor winding |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360223A (en) * | 2014-11-21 | 2015-02-18 | 中国科学院重庆绿色智能技术研究院 | System and method for detecting defects of micromotor rotor windings |
| US9255969B2 (en) | 2012-05-21 | 2016-02-09 | General Electric Company | Prognostics and life estimation of electrical machines |
| CN105527537A (en) * | 2014-09-28 | 2016-04-27 | 苏州热工研究院有限公司 | Device and method for generator rotor winding turn-to-turn insulation fault diagnosis |
| CN106292629B (en) * | 2016-08-18 | 2018-08-24 | 南京航空航天大学 | A kind of high ferro traction electric machine combined failure analogy method |
| CN111289897A (en) * | 2020-04-01 | 2020-06-16 | 深圳前海慧联科技发展有限公司 | Motor monitoring system |
| CN111983450A (en) * | 2020-08-18 | 2020-11-24 | 哈尔滨工业大学 | Electric automobile driving motor fault diagnosis system based on embedded detection coil |
| CN115407195A (en) * | 2022-07-19 | 2022-11-29 | 阳江核电有限公司 | Method and system for positioning turn-to-turn short circuit fault of rotor of generator and storage medium |
-
2007
- 2007-01-19 CN CNU2007201182017U patent/CN201000476Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9255969B2 (en) | 2012-05-21 | 2016-02-09 | General Electric Company | Prognostics and life estimation of electrical machines |
| CN105527537A (en) * | 2014-09-28 | 2016-04-27 | 苏州热工研究院有限公司 | Device and method for generator rotor winding turn-to-turn insulation fault diagnosis |
| CN104360223A (en) * | 2014-11-21 | 2015-02-18 | 中国科学院重庆绿色智能技术研究院 | System and method for detecting defects of micromotor rotor windings |
| CN106292629B (en) * | 2016-08-18 | 2018-08-24 | 南京航空航天大学 | A kind of high ferro traction electric machine combined failure analogy method |
| CN111289897A (en) * | 2020-04-01 | 2020-06-16 | 深圳前海慧联科技发展有限公司 | Motor monitoring system |
| CN111289897B (en) * | 2020-04-01 | 2022-07-08 | 深圳前海慧联科技发展有限公司 | Motor monitoring system |
| CN111983450A (en) * | 2020-08-18 | 2020-11-24 | 哈尔滨工业大学 | Electric automobile driving motor fault diagnosis system based on embedded detection coil |
| CN115407195A (en) * | 2022-07-19 | 2022-11-29 | 阳江核电有限公司 | Method and system for positioning turn-to-turn short circuit fault of rotor of generator and storage medium |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080102 |
|
| EXPY | Termination of patent right or utility model |