Title :
Thermal Overshoot Analysis for Hot-spot Temperature Rise of Transformer
Author :
Zhou, L.J. ; Wu, G.N. ; Yu, J.F. ; Zhang, X.H.
Author_Institution :
Southwest Jiaotong Univ., Chengdu
fDate :
10/1/2007 12:00:00 AM
Abstract :
The objective of this paper is to introduce a general model of hot-spot temperature rise calculation for the non-directed flow windings in order to explain the thermal overshoot phenomenon. The model employs heat transfer principles and hydrodynamics, in which the duct oil flow velocity is taken into account, and is validated using experimental results obtained for step changing load current on a oil natural-air natural (ONAN) cooling mode, 40 MVA transformer. The thermal overshoot phenomenon is analyzed by simulation for a 20-MVA-ONAN-cooled unit and a 40-MVA-ONAN-cooled unit.
Keywords :
cooling; hydrodynamics; power transformers; duct oil flow velocity; heat transfer principles; hot-spot temperature rise; hydrodynamics; nondirected flow windings; oil natural-air natural cooling mode; power transformer; thermal overshoot analysis; Ducts; Heat transfer; Hydrodynamics; Oil insulation; Petroleum; Power transformer insulation; Power transformers; Temperature; Thermal engineering; Thermal loading;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2007.4339495
