Abstract
The dissolved gas analysis (DGA) of transformers can provide an insight view related to thermal and electrical stresses during operations of oil-immersed power transformers. DGA has been practised widely to detect incipient transformer faults and can therefore prevent any further damage to transformers. This chapter focuses on a literature review concerning conventional DGA techniques, as well as the recent advance in DGA diagnostic techniques. Firstly the gas evolution in a transformer is introduced. Various conventional DGA diagnosis methods are then presented, which are usually combined to give a comprehensive view of internal characteristics of transformers, such as the Rogers ratio method, the key gas method, the gassing ratio method, etc. Finally, a brief introduction to the diagnostic techniques using CI for DGA are presented.
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