Publication: Design and simulation of three-phase transformer
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Date
2023-07
Authors
Nigel, Teo Tsai Lung
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Abstract
The design of a three-phase power transformer is a very difficult and time-consuming task that requires simultaneous consideration of both mathematical and physical aspects in order to meet the required specifications. Core losses, winding losses, on-load current, and no load current are a few crucial transformer design parameters. In addition, the choice of core, conductor, and insulation materials, as well as their dimensions and geometries, play a significant role in the production of power transformers. Consequently, this thesis demonstrates the design of a 50 MVA, 220/11 kV three-phase power transformer using ANSYS Maxwell 2D simulation software. The external circuit is constructed with a star-delta winding configuration, and resistive, inductive, and capacitive loads are applied. Analytical Calculation Method (ACM) is utilized to determine the transformer core and winding dimensions. To estimate the performance of the transformer, a transient analysis is undertaken for the simulation of the transformer model under various load conditions (50% and 100%) for the analysis of no-load and on-load conditions as well as the electrical losses. The problem faced by the 50 MVA transformer consists of problem of the line current in the primary winding takes a longer time to reach steady state, the input current is not in steady state during no-load operating condition and a difference in copper loss values. When the obtained simulation results are compared to the theoretical data, it can be seen that the simulation efficiency of the transformer rises above
the theoretical value. With the exception of the core loss and no-load current, the results show that the simulation data and calculated values are only marginally off. This shows that there are still numerous design considerations to be made.