Finite Element Analysis on HV Bushing Turrets at Power Transformer 95 MVA, 66kV

The bushing turrets are used to attach bushing to the power transformer's tank and to meet electrical performance specifications set forth by the customer. Additionally, because the bushing turret is subjected to high stress from wind and overhead cable pulling, it poses a risk to the welding bushing turret itself. The goal of this study is to analyze the stress placed on the bushing turrets by wind force and overhead cable pulling at the construction site. A turret is an elevated structure, typically circular in shape to reduce oil volume, that sits atop the power transformer cover tank. Finite Element Analysis (FEA), which uses samples from power transformers with rated high voltages of 66 kV and 95 MVA, is used in this research's qualitative methodologies. Sheet steel grade SS400 with a thickness of 6 mm, tensile strength of 400 N/mm², yield strength of 240 N/mm², and allowed strength of 144 N/mm² is the material used to create the bushing turret. And two scenarios will be used in this study: At the bushing tower, there are two types of wind loads: radial and same-direction. Based on the results of the finite element analysis for both situations, it can be concluded that the welding bushing turret is under stress at 85.2 MPa N/mm², which is less than the turret material's maximum permissible strength of 144 MPa N/mm². This analysis demonstrates how 50% of the proposed weld connection is below the permissible strength since this study is only concerned with the strength of the bushing turret. The welded junction itself is therefore extremely safe and rigid.