The gas content in transformer oil is an important indicator to ensure the safe operation of transmission equipment. When the content of the ultra-high voltage and large-capacity transformer oil exceeds the standard value

it can accelerate the aging of the oil and insulation materials. In severe cases

it can cause breakdown and affect the safe operation of the equipment. In this study

based on the study of dissolved gas components and characteristics in the oil

with reference to relevant domestic and foreign standards and manufacturer's regulations

the gas content of 336 sets of transformers in 330 kV and above grades of a certain group power generation enterprises is investigated. The reasons of excessive gas content are analyzed and the corresponding measures are put forward. And the significance of the gas content indicator in the oil to ensure the insulation performance of the transformer

the sealing of the equipment

and preventing oil aging is emphasized.