IEEE Std C57.119:2001 pdf free download

IEEE Std C57.119:2001 pdf free download.IEEE Recommended Practice for Performing Temperature Rise Tests on Oil-Immersed Power Transformers at Loads Beyond Nameplate Ratings.
3.1.7 heat exchanger: An oil-to-air, or oil-to-water, heat exchanging device attached to an nil-filled transformer for the purpose of exchanging heat from the transformer oil to the ambient media, typically requiring pumps for oil circulation and fans for circulation of the ambient air across the heat exchanging surfaces.
3.1.8 hottest spot temperature: The maximum temperature of the surface of any current-carrying conducbr in contact with oil or insulation. See also: winding holtest spot temperature.
3.1.9 nondirected floi (oil-immersed forced oil cooled transformers): This indicates that the pumped oil from heat exchangers or radiators flows freely inside the tank, and it is not forced to flow through the winding.
3.1.10 oil-Immersed transformer: A transformer in which the core and coils are immersed in an insulation
3.1.11 radIator: An oil-to-air heat exchanging device attached to a transformer for the purpose of exchanging sufficient heat from the transformer oil to the ambient air by natural convection of oil and air to comply with the UNAN rating temperature rise requirements. Additional heat may he exchanged by the addition of forced circulation of the ambient air or oil.
3.1.12 transformer: An oil-immersed power transformer rated in accordance with IEEE SW C57.l2.and ANSI C57.l2.lO-1997.
3.1.13 top oil temperature: The temperature measured below the top surface of the oil in a transformer in a location to represent the average temperature of the topmost layer of oil in the transformer. It is the temperature of the mixed oil that has circulated across the various heated surfaces inside the transformer and risen toward the top surface.
3.1.14 winding hottest spot temperature: The maximum temperature of the surface ot any winding conductor in contact with insulation or oil.
3.2 Symbols
Symbols listed is this clause and used in equations throughout this document have been selected in accordance with standard symbols adopted by the IEEE Transformers Committee. October 198X. Additional symbols, when required, were assigned following the style of the adopted symbols.
Users of this procedure are cautioned that some of these symbols may be different from those used in the referenced loading guides, which do not use symbols consistently. These loading guide equations have been rewritten in Annex A using symbols consistent with this document.
Unless otherwise expressed, all temperatures and temperature differences are in degrees Celsius. and all times and time constants are in hours.