Title :
Transformer Tertiary Stabilizing Windings. Part I: Apparent power rating
Author :
Penabad-Duran, Patricia ; Lopez-Fernandez, Xose M. ; Alvarez-Mariño, Casimiro
Author_Institution :
Dept. of Electr. Eng., Univ. of Vigo, Vigo, Spain
Abstract :
This paper presents a calculation method for the apparent power rating of Tertiary Stabilizing Winding (TSW) of power transformers, which is scarcely discussed in the literature. The objective of the work is to offer an approach for the dimensioning of TSWs from the knowledge of expected unbalanced load conditions. For that purpose, the equivalent circuit model of a three-winding transformer for single-phase load and single phase-to-ground fault study is discussed, where zero sequence impedances are determined by means of several proposed tests. A practical application is presented and the equivalent circuit model is validated with Finite Element Method (FEM) computations. A companion paper which complements this work evaluates the influence of TSWs on the overheating hazard on tank walls under unbalanced load conditions.
Keywords :
finite element analysis; power transformers; transformer windings; FEM computations; apparent power rating; calculation method; equivalent circuit model; finite element method; power transformers; single phase-to-ground fault; single-phase load; tertiary stabilizing winding; three-winding transformer; transformer tertiary stabilizing windings; unbalanced load conditions; zero sequence impedances; Circuit faults; Equivalent circuits; Impedance; Integrated circuit modeling; Transformer cores; Windings; Core type; Equivalent circuit; Leakage flux; Symmetrical components; Tertiary stabilizing winding; Three-phase transformer; Zero sequence current;
Conference_Titel :
Electrical Machines (ICEM), 2012 XXth International Conference on
Conference_Location :
Marseille
Print_ISBN :
978-1-4673-0143-5
Electronic_ISBN :
978-1-4673-0141-1
DOI :
10.1109/ICElMach.2012.6350213