Finite Element Analysis of Turbine Generator Rotor Winding Shorted Turns

Šašić, M.; Lloyd, B.A.; Elez, Ante

doi:10.1109/tec.2012.2216270

Cited by 60 publications

(13 citation statements)

References 2 publications

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“…After a turn-to-turn short circuit in the turbo-generator rotor winding occurs, the step amplitude of excitation magnetic field changes at the position of fault slot. The leakage flux of rotor faulty slot will be smaller than that of corresponding normal slot [4]. For a rotor dynamic eccentricity fault, the change in the air gap length for the turbo-generator is asymptotic, so the change in main magnetic field is relatively subtle.…”

Section: Extraction Methods For Turn-to-turn Short Circuit Characterismentioning

confidence: 99%

“…For turbo-generators, various kinds of online detection methods capable of detecting turn-to-turn short circuits in rotor windings have been proposed. For example, Mladen Šašić et al [4] detected the symmetry of each slot leakage flux in the rotor using a micro-probe. According to the symmetry, they determined if a turn-to-turn short circuit occurred.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anti-Interference and Location Performance for Turn-to-Turn Short Circuit Detection in Turbo-Generator Rotor Windings

2019

Energies

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Online and location detection of rotor winding inter-turn short circuits are an important direction in the field of fault diagnosis in turbo-generators. This area is facing many difficulties and challenges. This study is based on the principles associated with the U-shaped detection coil method. Compared with dynamic eccentricity faults, the characteristics of the variations in the main magnetic field after a turn-to-turn short circuit in rotor windings were analyzed and the unique characteristics were extracted. We propose that the degree of a turn-to-turn short circuit can be judged by the difference in the induction voltage of the double U-shaped detection coils mounted on the stator core. Here, the faulty slot position was determined by the local convex point formed by the difference in the induced voltage. Numerical simulation was used here to determine the induced voltage characteristics in the double U-shaped coils caused by the turn-to-turn short circuit fault. We analyzed the dynamic eccentricity fault as well as combined the fault of a turn-to-turn short circuit and dynamic eccentricity. Finally, we demonstrate the positive anti-interference performance associated with this fault detection method. This new online detection method is satisfactory in terms of sensitivity, speed, and positioning, and overall performance is superior to the traditional online detection methods.

show abstract

Section: Extraction Methods For Turn-to-turn Short Circuit Characterismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anti-Interference and Location Performance for Turn-to-Turn Short Circuit Detection in Turbo-Generator Rotor Windings

2019

Energies

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“…Fratila et al performed the iron loss calculation in a turbine generator using finite element method [4]. Šašić et al focused on the finite element analysis of turbine generator rotor winding shorted turns [5]. Sufei et al studied the implementation of surface impedance boundary conditions, impact of press plate structure on the flux and loss distributions, efficient calculation of the strand eddy current loss distributions, parametric study for the design, and fast calculation of the magnetic field and loss distributions in the end region of large synchronous generators [6]- [10].…”

Section: Introductionmentioning

confidence: 99%

Influence of Extension Length of Rotor End Windings on the Three-Dimensional Electromagnetic Field and Temperature Rise in the Large Turbine Generator End Zone With Magnetic Screen

Han

Wang

et al. 2020

IEEE Access

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Leakage magnetic field from the rotor end windings affects obviously the electromagnetic losses and temperature of end components in the turbine generator end zone with magnetic screen. As the capacity of turbine generator increases, this effect of rotor end windings has become more prominent. To investigate influence of the extension length of rotor end windings on the electromagnetic and thermal fields in the turbine generator end zone with magnetic screen, three-dimensional transient electromagnetic field model of 1250 MW turbine generator end zone is given. Leakage magnetic field and losses of end components are compared and studied in the end zone under the different extension lengths of rotor end windings. Based on the calculation results of electromagnetic losses (heat sources) and flow network (boundary conditions), three-dimensional fluid-thermal coupling field is calculated in the turbine generator end zone with magnetic screen. Distribution of complex fluid velocity in the end zone is obtained. Influence of the different extension lengths of rotor end windings on the stator-end copper coil, screen plate, finger plate, press plate, magnetic screen, and stator end core is researched in the turbine generator end zone. The accuracy of calculation results is validated by experimental values. INDEX TERMS Turbine generator end zone, magnetic screen, rotor end windings, extension length, transient electromagnetic field, thermal field.

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“…Stancheva and Iatcheva [4] studied the 3D electromagnetic force distribution in the end region of a turbogenerator. Some other researchers conducted studies in the physical field of turbogenerators [5][6][7][8]. However, there is a paucity of studies on the CHTC distribution of end metal parts in the end region of a turbogenerator.…”

Section: Introductionmentioning

confidence: 99%

Numerical calculation of CHTC on end metal parts and flow in end region of a turbogenerator

Han

2018

IET Science, Measurement & Technology

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Finite Element Analysis of Turbine Generator Rotor Winding Shorted Turns

Cited by 60 publications

References 2 publications

Anti-Interference and Location Performance for Turn-to-Turn Short Circuit Detection in Turbo-Generator Rotor Windings

Anti-Interference and Location Performance for Turn-to-Turn Short Circuit Detection in Turbo-Generator Rotor Windings

Influence of Extension Length of Rotor End Windings on the Three-Dimensional Electromagnetic Field and Temperature Rise in the Large Turbine Generator End Zone With Magnetic Screen

Numerical calculation of CHTC on end metal parts and flow in end region of a turbogenerator

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