Intro：S13-M-315/10 fully sealed oil-immersed power transformers with low loss, low noise, high eficiency advantages, can achieve good energy saving efect and reduce pollution. Fully sealed transformer and ordinary oil . imersed change Compared to the removal of the oil conservator, the change in oil volume is automatically adjusted by the elasticity of the ripple of the corrugated fuel tank, the transformer is isolated from the air to prevent and slow the deterioration of the oil and the insulation aging, Operational reliability, uptime maintenance.