Analysis of iron losses in transformer core

Abstract

A three phase transformer test facility has been used in this project for measuring the localized power loss and flux distribution within the core. The flux and power loss distributions in the T-joint of a core with 60° T joints have been investigated because the core assembled with 60o T-Joint is more efficient than other T-Joint. At 60° T-joint corner of transformer core shows there is more the line flux entering the centre limb of core. But the results find the smallest magnetic field energy, power loss and Building Factor (B.F).For this project, the flux density distribution was measured by the initial rate of temperature rise using miniature thermocouples, and the localized power loss was found by measure using an iron loss tester. The flux penetration into the central limb was an important factor in causing the differences in performance. Reducing the waste of electrical energy is still the highest priority especially since losses in transforming electrical power can amount 4.5% of all energy generated and about one third of this is dissipated in distribution transformer.