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Thermal Modeling of Dry-Transformers and Estimating Temperature Rise

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Temperature rise in a transformer depends on variety of parameters such as ambient temperature, output current and type of the core. Considering these parameters, temperature rise estimation is still complicated procedure.

In this paper, we present a new model based on simple electrical equivalent circuit. This method avoids the complication associated to accurate estimation and is in very good agreement with practice.

INTRODUCTION:
Temperature rise is one of the most crucial parameters that affect the transformer lifetime. Temperature rise can easily leads to the serious damages. This makes temperature estimation an important priority for engineers and companies.

Different methods have been suggested. Among them, measurement of winding resistance according to IEEE/ANSI standards, usage of Fiber Optic for measurement of Hot-Spot temperature and software’s simulations can be mentioned.

In this study we present a simple model based on parameters that can be calculated using the manufacture data of the transformer. The value of the thermal equivalent resistance is initially extracted from experimental data and to increase the model accuracy, this value is adjusted via simple procedure.
Source: WASET
Author: M. Ghareh | L. Sepahi

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Differential Projection for Arbitrary 3-Phase Power Transformers

Three Phase Transformer Winding Configurations and Differential Relay Compensation

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