Rotor Vibration Difference Among the Single and the Combined Faults Composed by Static Air-Gap Eccentricity and Rotor Interturn Short Circuit

He, Yu‐Ling; Wang, Falin; Ke, Meng-Qiang; Tang, Guiji

doi:10.1007/978-3-319-06590-8_52

Cited by 3 publications

(7 citation statements)

References 11 publications

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“…However, since SAGE exists in almost every generator, there is actually a CF occurring when RISC takes place. Previous studies on this kind of CF found that the failure characteristics are different from those of the single SAGE and RISC faults [20]. Moreover, it has been also found that the rotor vibration has very similar features under many different faults.…”

Section: Introductionmentioning

confidence: 83%

“…Thus, MFD will be affected by either of these two faults. Typically, the air gap and MMFs under different conditions are indicated in Figure 1 [20].…”

Section: Magnetic Flux Densitymentioning

confidence: 99%

“…Moreover, it has been also found that the rotor vibration has very similar features under many different faults. For example, the mass unbalance of the rotor, the RISC fault, and the stator interturn short circuit (SISC) will all cause rotor vibrations at f [20][21][22]. However, the stator vibration properties are found to be much more distinguishable.…”

Section: Introductionmentioning

confidence: 99%

“…However, the stator vibration properties are found to be much more distinguishable. The stator will vibrate at f, 2f, 3f, and 4f under RISC [20,21] and 2f, 4f, and 6f under SISC [23,24], respectively, while under the mass unbalance fault the stator vibration will change very little. Therefore, comparably, the stator vibration has a more sensitive effect to identify the failure types, though most scholars have paid their primary attention to the rotor vibrations but not the stator vibration characteristics [18,[20][21][22]24].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stator Vibration Characteristic Identification of Turbogenerator among Single and Composite Faults Composed of Static Air-Gap Eccentricity and Rotor Interturn Short Circuit

Deng

Peng

et al. 2016

Shock and Vibration

Self Cite

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This paper investigates the radial stator vibration characteristics of turbogenerator under the static air-gap eccentricity (SAGE) fault, the rotor interturn short circuit (RISC) fault, and the composite faults (CFs) composed of SAGE and RISC, respectively. Firstly, the impact of the faulty types on the magnetic flux density (MFD) is analyzed, based on which the detailed expressions of the magnetic pull per unit area (MPPUA) on the stator under different performing conditions are deduced. Then, numerical FEM simulations based on Ansoft and an experimental study are carried out, taking the SDF-9 type fault simulating generator as the study object. It is shown that SAGE will increase the stator vibration at 2f (f is the electrical frequency) which already exists even in normal condition, while RISC and CF will bring in stator vibrations at f, 2f, 3f, and 4f at the same time. The vibration amplitudes under CF are larger than those under RISC. As SAGE increases, the vibration amplitudes of each harmonic component under CF will all be increased, while the development of RISC will decrease the 2nd harmonic vibration but meanwhile increase the 4th harmonic vibration. The achievements of this paper are beneficial for fault identification and condition monitoring of the turbogenerator.

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Section: Introductionmentioning

confidence: 83%

“…Thus, MFD will be affected by either of these two faults. Typically, the air gap and MMFs under different conditions are indicated in Figure 1 [20].…”

Section: Magnetic Flux Densitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stator Vibration Characteristic Identification of Turbogenerator among Single and Composite Faults Composed of Static Air-Gap Eccentricity and Rotor Interturn Short Circuit

Deng

Peng

et al. 2016

Shock and Vibration

Self Cite

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“…Junqing Li et al analyzed the mathematical expressions of the magnetic momentum and current under RISC conditions and presented the relationship between different harmonic changes of the stator branch current and the 2 of 11 RISC short-circuit position [14]. In [15,16], the stator current and circulation characteristics of the composite failure of the generator are analyzed, and the stator voltage RMS decreases when the RISC occurs. Hao et al used the multi-loop theorem to obtain an expression for the current of each loop.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Torque Fluctuating Properties under Dynamic RISC Fault in Turbogenerators

Qiu

Xing-hua

et al. 2022

Energies

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This paper analyzes the electromagnetic torque (EMT) fluctuation characteristics in synchronous generators under rotor interturn short-circuit (DRISC) fault. The novelty of this paper is that the DRISC fault is proposed based on the intermittent interturn short circuit existing in the actual operation and compared with the static rotor interturn short-circuit (SRISC) fault. In the work, by studying the influence of DRISC with different positions and different short-circuit degrees, the fluctuation characteristic of the EMT is analyzed and verified. The results show that when the DRISC5% fails, the location is in slot 3, the amplitude of first harmonic decreases by 7.2%, second harmonic amplitude increases by 33.4%, third harmonic decreases by 4.3%, and fourth harmonic increases by 26.8%. As the degree increased and positioned away from the large tooth of the DRISC, the overall EMT amplitude and reverse pulse increased, first and third harmonics decreased, and second and fourth harmonics increased.

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Asenkron motorlarda eşzamanlı kırık rotor çubukları ve statik eksenel kaçıklık arızalarının stator akımı ve titreşim sinyalleri analizi ile tespiti

Kabul

Ünsal

2021

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Asenkron motorların endüstriyel üretim süreçlerinde yaygın olarak kullanılması, bu motorların arıza tespitlerinin doğru ve eksiksiz olarak yapılmasını gerekli kılmıştır. Kırık rotor çubukları ve eksenel kaçıklık arızaları asenkron motorlarda karşılaşılan arıza tiplerindendir. Bu iki arızanın aynı anda oluşması işletme ortamında sıklıkla karşılaşılan bir durumdur. Böyle anlarda, bu arızalara ait harmonik bileşenlerin net bir şekilde tespit edilebilmesi, planlanmamış işletme duruşlarının önlenmesi açısından önemlidir. Bu bileşenlerin tespitinde karşılaşılan önemli sorunların başında başka sinyaller (gürültü, baskın harmonik bileşenler vb.) içerisinde gizlenen düşük genlikli harmonik bileşenler gelmektedir. Bu çalışmada, eksenel kaçıklık ve kırık rotor çubuklarından oluşan çoklu arıza durumu incelenmiştir. Motorun akım ve titreşim sinyalleri dört farklı yük kademesinde (%25, %50, %75, %100) kaydedilerek, Hilbert zarf analizi yöntemi ile sinyal analizleri yapılmıştır. Analiz sonucunda karakteristik frekanslar ve bu bileşenlere ait genlikler zarf spektrumunda başarılı bir şekilde görüntülenebilmektedir. Grafiksel ve tablo formunda verilen sonuçlar, önerilen yöntemin aynı anda oluşan kırık rotor çubuğu ve eksenel kaçıklık arızalarının tespitinde kullanılabileceğini göstermektedir.

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Rotor Vibration Difference Among the Single and the Combined Faults Composed by Static Air-Gap Eccentricity and Rotor Interturn Short Circuit

Cited by 3 publications

References 11 publications

Stator Vibration Characteristic Identification of Turbogenerator among Single and Composite Faults Composed of Static Air-Gap Eccentricity and Rotor Interturn Short Circuit

Stator Vibration Characteristic Identification of Turbogenerator among Single and Composite Faults Composed of Static Air-Gap Eccentricity and Rotor Interturn Short Circuit

Electromagnetic Torque Fluctuating Properties under Dynamic RISC Fault in Turbogenerators

Asenkron motorlarda eşzamanlı kırık rotor çubukları ve statik eksenel kaçıklık arızalarının stator akımı ve titreşim sinyalleri analizi ile tespiti

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