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11 results on '"Zhu, Erhang"'

3. Research on the Influence of Metal Windscreen on 3-D Transient Electromagnetic Field in the End Region of a 300 MVar Synchronous Condenser

Author

Zhu, Erhang and Liang, Yanping

Abstract

Due to the influence of skin effect of eddy currents, the temperature rise in the outer circular region of the press plate of large synchronous condenser (SC) is large. The metal windscreen is located on the outer side of the press plate and has a significant impact on the magnetic flux density in the press plate. In order to reduce loss in the press plate, this paper proposes 12 types of metal windscreen. Taking a 300MVar SC as an example, 3-D transient electromagnetic field calculation models are established. The numerical simulation method is used to calculate the end magnetic field and eddy current loss in the end structures of the SC under rated operating conditions. The influence of metal windscreen with different structures and materials on the end magnetic field and eddy current loss in the end structures is analyzed. Finally, the obtained eddy current loss is used as a heat source to calculate the temperature rise of the end structure, and the accuracy of the calculation results is verified through experiments. This study provides a theoretical basis for optimizing the design of the SC end.

Published
2024
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9. Calculation of magnetic field and eddy current loss in end clamping ring of 300MVA synchronous condenser based on a novel semi‐analytical method.

Author

Zhu, Erhang, Liang, Yanping, Han, Xiao, Bian, Xu, and Wang, Dongmei

Subjects
*EDDY current losses, *MAGNETIC fields, *MAGNETIC flux leakage, *FINITE element method, *DENSITY currents
Abstract

It is very important to consider the eddy current reaction of the metal structure in large electric machines, which has a direct impact on the calculation results of induced current and loss. In order to solve the problem that the complex end leakage magnetic field is difficult to calculate directly, a new semi‐analytical method (NSM) considering the eddy current reaction is proposed. Firstly, the corresponding relationship between the external magnetic field and the global magnetic field of the clamping ring in two simple calculation models is obtained by the 3‐D finite element method. Then, the external magnetic field of the clamping ring in a 300MVA synchronous condenser under rated operating conditions is calculated, and the global magnetic field of the clamping ring is determined based on the obtained corresponding relationship. The eddy current density and eddy current loss of the clamping ring are calculated using the external magnetic field and the global magnetic field respectively. Finally, the calculation results were compared with the 3‐D finite element results, which verified the importance of the global magnetic field and the accuracy of the NSM. [ABSTRACT FROM AUTHOR]

Published
2023
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