During transformer operation it is important to monitor condition of the transformer. In practice, this means taking oil samples from the transformer and analyzing them in certified laboratories. In this diploma thesis the following analysis has been done: the formation of gases in a transformer, which types of gases are generated during different types of faults, measurements of gas concertation during operation of the transformer, taking of oil samples and interpreting measurements with the Duval triangle and the Duval pentagon. Based on oil analyzes performed at Kolektor Etra, we checked whether there were deviations in the gas concentration based on various transformer designs after the factory measurements were completed.
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