efficient operation significantly improve crucial benefits internal condition detect hotspots transformer reducing transformer windings significantly reduce safe reliable costly repairs buchholz relay loose windings overheating arcing gases dissolved oils ability winding faults infrared thermography leaks cracks external components visual inspection checkups involve voltage levels vital role critical components routine checkup transformer failures potential problems internal problems safety device power systems identify mechanical problems reliable power supply transformer tank bushings downtime improved safety prevent catastrophic failures analysis power companies comprehensive maintenance program optimize maintenance schedules transformers conservator tank locate partial discharges provide valuable insights dielectric strength measures