DISC TYPE TRANSFORMER WINDINGS IN AN OD COOLING MODE WITH DIRECTED OIL FLOW

Abstract

In this paper, power transformer has to keep the temperature within limits according to international agreement
standards. Two of the limits are a maximum temperature rise and a maximum oil temperature. The main purpose of this study
was to learn about the temperature distributions and oil velocity inside the coil of the power transformer and to model and
develop a program using MATLAB that can modulate the suitable parameter that not exceeds maximum temperature rise in
disk coil transformer. Two methods have been used to study the velocity and temperature parameters affecting the oil flow
through the transformer. The first approach focused on equation derived from previous worked about oil flow and
temperature distribution. The second approach was to handle the problem as a global optimization problem solved by
numerical methods. The optimization was done using predictions from a program used for velocity and temperature
calculation. The numerical method result was successful; on all the designs tested. It gave a lower temperature rise value
according to international agreement standards. The study has shown that a geometrical detail approach provided for better
design solutions in reasonable time and therefore it has shown its potential for practical use. Both the methods could be
combined and used for further investigation.