01867nam 2200349 450 991013576820332120231206190642.00-7381-4301-410.1109/IEEESTD.1981.81014(CKB)3780000000089309(NjHacI)993780000000089309(EXLCZ)99378000000008930920231206d1981 uy 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierANSI/IEEE Std C57.91-1981 IEEE Guide for Loading Mineral-Oil-Immersed Overhead and Pad-Mounted Distribution Transformers Rated 500kVA and Less with 65 C or 55 C Average Winding Rise /Institute of Electrical and Electronics EngineersNew York, New York :IEEE,1981.1 online resource (26 pages)General recommendations for loading 65 degrees Centigrade-rise mineral-oil-immersed overhead and pad-mounted distribution transformers are covered. Recommendations for 55 degrees Centigrade-rise transformers are included because a substantial percentage of these transformers are still in service. The recommendations are based on winding hottest-spot calculations only. Other factors that may limit the permissible load to lower values are listed. A method to establish winding temperature and loss of life by nomographs is given.ANSI/IEEE Std C57.91-1981: IEEE Guide for Loading Mineral-Oil-Immersed Overhead and Pad-Mounted Distribution Transformers Rated 500 kVa and Less With 65 Degrees C Or 55 Degrees C Average Winding RiseElectric transformersProtectionElectric transformersProtection.621.317NjHacINjHaclDOCUMENT9910135768203321ANSI2072434UNINA