0 Introduction Dissolved gas analysis (DGA) in insulating oil is a crucial test for large oil-immersed power transformers. By employing gas chromatography, it is possible to timely detect the aging or changes in internal insulation oil of oil-filled electrical equipment, identify potential faults such as overheating or electrical discharges at an early stage, and accurately assess the severity, type, and development trend of the fault. Gas chromatography has become an essential method for monito
10/31/2025
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