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The paper presents application of newly developed three-dimensional (3-D) computer tool used for simulation of the automated pressure gelation process. The tool that is based on commercial CFD software-Fluent-enables the simulation of filling and curing stages and gives useful information helping to understand the phenomena occurring inside the mold. To simulate the complex rheology of the material, Macosko's model for viscosity and Kamal's model for curing kinetics were used and successfully applied in the software. First simulations were applied for arbitrary set parameters and formulated recommendations were later applied to approve the existing process. The simulation was performed for voltage transformer used in medium voltage applications and resulted in the optimization of the process parameters what allowed reduction of manufacturing time of the transformer considerably. Additionally the results of experimental verification of the simulation were presented in the paper showing very good agreement between simulation results and measured data.