Application of the temperature-time method for measurement of local power losses in transformer steel parts

Abstract

Paper presents an application of temperature-time method for measurement of local losses in magnetic steel. Developed measurement system is described with focus on design of sensors and choice of instruments. Chosen equipment is tested on a DC circuit designed for measurement of losses in aluminum and copper conductors. Same measurement system is used for local loss measurement on magnetic steel rings. Measurement errors due to non-uniform loss distribution inside magnetic steel and heat dissipation to surrounding medium are analyzed and estimated.