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

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.