The oil-immersed power transformer extending the transformer's service life by lowering the degree of oil aging by the use of a corrugated tank sealing construction and enclosure that prevents air and water contact;to regulate the volume variation of transformer oil heat bilges cold shrink,corrugated steel is elastically deformed.The outdoor type,oil-free pillow,and high level anti-fouling product structure guarantee the grid's dependability and safe functioning.In the event of a transformer failure,a pressure release safety device is built into the transformer.The pressure relief vavle provides a safe and reliable means of releasing it,preventing the mishap from getting worse.