Surrogate-Model Optimization Based on Multi-condition Simulation of Power Transformer Tank

Structural strength of transformer tank is a key factor to ensure the stable operation of transformer. To address the design verification needs of large transformer tanks, the stress-strain characteristics of transformer oil tank under positive pressure, negative pressure, oil pressure and temperature rise are simulated and analyzed according to the design verification requirements of large transformer tank. Combined with the actual operating conditions of transformer, the strain distribution of transformer oil tank under the comprehensive action of positive pressure, oil pressure and temperature rise are analyzed. The results show that there is significant local displacement in the central area of the side wall. To optimize the strain distribution, a quantitative analysis is performed on the influence of positional parameters of stiffeners reinforcements on structural strength. Four stiffen-er positions with substantial impact on deformation are selected as optimization variables. A surrogate model is constructed to optimize their positions, revealing that displacements of 23 mm, −45 mm, −70 mm, and − 120 mm for the four stiffeners reduce the maximum surface displacement by 6.1%.