No matter thermal or electrical fault in transformer

it would lead to insulating medium cracking

which would produce characteristic gases.In the process of medium decomposition

the carbon-hydrogen bonds energy is lower.Generally

it generates hydrogen first

so hydrogen is one of the main components of fault characteristic gases.Through the phenomenon description of abnormal overproof hydrogen content in insulating oil of JEPC 2 high-voltage auxiliary transformers

according to the insulating oil chromatographic analysis

the reason of overproof hydrogen content was analyzed

and relevant treatment measures and implementation effect were introduced.