Applying a reverse design modelling technique to partial core transformers

This paper gives an overview of the process of designing partial core transformers using a reverse modelling technique. Modifications are made to full-core equivalent circuit components to accommodate partial core transformers. The model is applied to 50Hz transformers under normal operating temperature applications and also to transformers immersed in liquid nitrogen. It is then used for harmonic frequency analysis of partial core transformers where capacitive components are included. In all cases, comparisons are made between the model calculations and test results of as-built devices