Transformer core accidents caused by loosing ground wire

The paper describes grounding wire of transformer core becomes flexible, leads to the core produce suspended potential, results in discharge, the discharge current is generated power loss in the ground copper and the ground lead of the core, and causes transformer oil chromatographic analysis data anomalies. Put forward when the total hydrocarbons increases but not “out of limits”, the searching method for fault reasons, steps and precautions, noting that the external ground wire of transformer core is loosing also belongs to the category of the core faults.