Title :
Acceptable direct current in three-phase power transformers: comparative analysis
Author :
Picher, P. ; Bolduc, L. ; OliVier, IEESG
Author_Institution :
IREQ, Varennes, Que., Canada
Abstract :
This paper presents a comparative analysis of the temperature rise in three-phase core-form and shell-form power transformers in the presence of direct current. The temperature-rise assessment is compared on the basis of direct-current injection tests in single-phase core-form transformers, with a nominal voltage rating of 735 kV and nominal power ratings of 370 MVA and 550 MVA. The theoretical analysis of the saturation of three-phase transformers in the presence of direct current is based on the study of their magnetic circuit. The principle of duality was applied to obtain equivalent electric circuits simulated using the Electromagnetic Transients Program (EMTP) and validated using experimental results
Keywords :
equivalent circuits; magnetic circuits; power transformers; thermal analysis; transformer magnetic circuits; 370 MVA; 550 MVA; 735 kV; EMTP; Electromagnetic Transients Program; direct current; direct-current injection tests; duality principle; equivalent electric circuits; magnetic circuit; nominal power rating; nominal voltage rating; single-phase core-form transformers; temperature rise; three-phase core-form transformers; three-phase shell form power transformers; Circuit simulation; Circuit testing; EMTP; Magnetic analysis; Magnetic circuits; Magnetic cores; Phase transformers; Power transformers; Temperature; Transformer cores;
Conference_Titel :
Electrical and Computer Engineering, 1997. Engineering Innovation: Voyage of Discovery. IEEE 1997 Canadian Conference on
Conference_Location :
St. Johns, Nfld.
Print_ISBN :
0-7803-3716-6
DOI :
10.1109/CCECE.1997.614814
