Thermal Analysis for Distribution Transformer with ONAN Cooling System

A. Hassan, Ibtisam

	Thermal Analysis for Distribution Transformer with ONAN Cooling System
Al-Ma'mon College Journal
Article 1, Volume 0, Issue 29, 2018, Pages 202-223
Author
Ibtisam A. Hassan
Abstract
As in all electrical apparatus it is necessary to find the temperature distribution in all transformer components at the design stage with operation conditions. The temperatures, above the allowable thermal limits, can cause serious damage in transformer components. Thermal model is proposed in order to predict this necessary information, as a prior stage for beginning actual operation for the transformer. In this study, the thermal field was analyzed, based on tracking the heat generation from active parts down to the ambient. And then it was examined at specific transformer in a 2nd simulation basing on Finite Element Method (FEM) technique to determine the temperature distribution for a three phase transformer using ANSYS package. The present model was formulated to the transformers using (ONAN) cooling system. In order to examin the proposed model ability, a (400 KVA 11/.416 KV) transformer was chosen. The proposed model has achieved good results. This model can estimate the temperature distribution at specific points which are non-measurable locations and determined the hottest zone inside the transformer successfully. For the selected transformer, the maximum predictive temperature is (91.07°C), which is (1.07°C) more than the practical measured temperature and its location at coils zone.
Keywords
proposed thermal model; distribution transformer; ONAN; cooling system

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