IEEE C57.96-1999

This guide covers general recommendations for the loading of dry-type distribution and power transformers that have 80 ¿¿C, 115 ¿¿C, and 150 ¿¿C average winding rises and insulation systems limited to 150 ¿¿C, 180 ¿¿C, and 220 ¿¿C maximum hottest-spot operating temperatures, respectively, The guide includes recommendations for ventilated, nonventilated, and sealed dry-type transformers having impregnated insulation systems. For more specific recommendations for a particular transformer, the manufacturer of that transformer should be consulted.