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Keywords = electromagnetic torque (EMT)

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11 pages, 3956 KiB  
Communication
Electromechanical Characteristics Analysis under DSISC Fault in Synchronous Generators
by Yu-Ling He, Ming-Hao Qiu, Xing-Hua Yuan, Xian-Long He, Hai-Peng Wang, Meng-Ya Jiang, Chris Gerada and Shu-Ting Wan
Machines 2022, 10(6), 432; https://doi.org/10.3390/machines10060432 - 1 Jun 2022
Cited by 1 | Viewed by 2387
Abstract
This paper studies the electromechanical characteristics of synchronous generators under dynamic stator interturn short circuit (DSISC). First, the air gap magnetic flux density (MFD) of the generator under normal and DSISC fault was obtained. Then, the expression for the phase current and the [...] Read more.
This paper studies the electromechanical characteristics of synchronous generators under dynamic stator interturn short circuit (DSISC). First, the air gap magnetic flux density (MFD) of the generator under normal and DSISC fault was obtained. Then, the expression for the phase current and the electromagnetic torque (EMT) were obtained. After this, the phase current and EMT were analyzed by finite element analysis (FEA). Finally, the measured electromechanical characteristics of the CS-5 generator under different conditions were analyzed in accordance with theory and simulation. It was shown that with the occurrence, and deterioration, of DSISC, the amplitude of the first harmonic, third harmonic and fifth harmonic of the phase current became more affected by the pulse. Meanwhile, the even-numbered harmonics components of EMT increased. Full article
(This article belongs to the Special Issue Fault Diagnosis and Health Management of Power Machinery)
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11 pages, 2973 KiB  
Article
Electromagnetic Torque Fluctuating Properties under Dynamic RISC Fault in Turbogenerators
by Yuling He, Minghao Qiu, Xinghua Yuan, Haipeng Wang, Mengya Jiang, Chris Gerada and Shuting Wan
Energies 2022, 15(10), 3821; https://doi.org/10.3390/en15103821 - 23 May 2022
Viewed by 2190
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Condition Monitoring and Failure Prevention of Electric Machines)
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