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Correlation between predicted and tested temperature values of dry type transformer
Author(s)
Teechuen, Phairote
Date Issued
November 3, 2017
Type
Conference Paper
Abstract
The performance or output current of a transformer is subject to the load that it is connected to, which may be full, empty, or unusually excessive. Sometimes an overload may be unavoidable, such as in the case of a full load or an above normal load under which the transformer may carry an excessively high current and may result in a huge loss in the form of excessive heat. This will undoubtedly affect the functioning of the transformer, that is, the insulator that protects the coil may be deteriorated and the life of the transformer shortened. This article presents an analysis of the temperature change pattern of 1 MVA, 1,600 KVA cast resin transformer under a normal condition with the following objectives: to analyze the relationship between temperatures change of the low voltage and high voltage coils within predicted ranges of temperature; to predict the tolerances of the transformer against the load increase while extending the transformer life; and to predict the ability of the transformer to withstand heat due to temperature rising with a view to designing a high performance transformer. The method used in the test was by means of short-circuiting the low voltage coil while allowing the current flow through the high voltage coil at a rated load. This process highlights the rising temperature of the transformer as the prime factor in its performance.
Citation
Ecti Con 2017 2017 14th International Conference on Electrical Engineering Electronics Computer Telecommunications and Information Technology, 886-888, 2017