Analysis of Natural Frequency for Three-Dimensional Model of Transformer Winding Using FEA

Abstract

Abstract

Power transfer winding is prone to a number of events of a short circuit. However, over a period of time, capabilities of winding to withstand forces generated during such events decrease. In order to understand the behavior of winding at excitation, study of natural frequency is an important parameter. In this paper, winding’s radial and axial modes are studied with the help of finite element approach. Three-dimensional (3D) and two-dimensional (2D) models are used for calculation. 2D simplified model of the power transformer winding was used for investigating global mode, where the 3D fully scaled model was used for investigating the local mode of the winding and pressboard (spacers). In the paper, methodology to simplify complicated winding model to 2D model was developed. Moreover, it has been found that use of the 3D model for calculation can give accurate results and also gives information about stress generated within each pressboard. By increasing number of spacers or by changing width/depth/thickness, natural frequencies of the power transformer can be altered. Comparison of the proposed model and experimental model justifies the answer obtained.

 Keywords: Power transformer, winding, natural frequency, three-dimensional modeling (3D), Finite Element Analysis (FEA)

Cite this Article

Hadiya Pritesh Dulabhai, Vikrant Singh, Mukesh Kumar Yadav. Analysis of Natural Frequency for Three-Dimensional Model of Transformer Winding Using FEA. Journal of Instrumentation Technology & Innovations. 2018; 8(1): 8–12p.