Title :
Bubble evolution from transformer overload
Author :
Oommen, T.V. ; Lindgren, S.R.
Abstract :
Bubble evolution from the overloading of transformers is a concern due to possible dielectric failure. Since overloading is inevitable for short periods during peak demand periods, it is necessary to specify the limits of overloading with respect to winding hot spot temperature which determines bubble evolution. Through extensive coil model testing in the early 1990s, a mathematical equation was formulated to compute bubble evolution temperatures under a variety of conditions: moisture in insulation, gas content of oil, and the pressure in the system. This paper describes the coil models, test results and the mathematical formula. Also presented is a tentative mechanism of bubble formation
Keywords :
bubbles; insulation testing; power transformer insulation; power transformer testing; transformer oil; transformer windings; bubble evolution temperatures; coil model testing; dielectric failure; insulation bubble evolution; insulation moisture; mathematical equation; power transformer overload; transformer oil gas content; winding hot spot temperature; Coils; Dielectrics; Equations; Insulation testing; Mathematical model; Moisture; Oil insulation; Power transformer insulation; System testing; Temperature;
Conference_Titel :
Transmission and Distribution Conference and Exposition, 2001 IEEE/PES
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7285-9
DOI :
10.1109/TDC.2001.971223
