Design Optimization of a Transformer Tank Under Vacuum & Pressure Conditions

Abstract

A transformer is a static device that transmits the electric energy from one device to another circuit by effect of magnetic induction at constant frequency. The fundamental on which transformer work are electrical energy received at primary winding that is first converted to magnetic energy and then it is re-converted to electrical energy at Secondary terminal. Thus primary and secondary windings are coupled by magnetic field.

Major work focuses on tank part of the of 15 MVA, 66/11 KV transformer is used in this dissertation work . Tank consist of core-coil assembly after inserting assembly in the tank oil is filled inside the tank . Due to the change in temprature of transformer oil it results into pressure and vacuum genration inside the transformer tank that analysis have been carried out with the help of solidworks 2014 simulation package and the results are displayed by means of stress, strain and displacement plots which are being compared with the test shop results. The design of the tank have been optimized by reducing the plate thickness of the tank, these results into reduction in weight and cost. For the improvement in strength, and withstand capability of pressure and vacuum generated inside the tank by sudden change in temperature of oil, the design of suitable stiffners are carried out by horizontal arrangement of stiffners which has been consider for analysis.

The application of the transformer covers large range of industries the location of the manufacture of transformer assemblies varies from sea level to the very high on the mountain.

Almost all regions experience the earthquake with varying severity. This seismic activity will affect the functionality of a transformer. It may fail under action of earthquake the procedure for calculating required foundation bolt size under the effect of seismic and wind loading has been attempted. Also the analysis of that foundation bolt have been carried out.