Title :
Modeling of the energization of a power transformer in a 110 kV network and its validation by on site tests. Description of ferroresonance phenomena involved and means to avoid them.
Author :
Rioual, Michel ; Guuinic, M. Philippe ; Laval, Damien ; Schafer, Michael ; Abdelghani, Mohamed Ali ; Schafer, Nils
Author_Institution :
R&D Div., Electr. de France, Clamart
Abstract :
This document presents the energization of a transformer in a 110 kV distribution network. It shows that high discrepancies in the circuit-breaker poles closing times may lead to high overvoltages, which have been confirmed by on site tests. Phenomena involved are ferroresonance ones, after the energization of the transformer, when phases A and C saturate while the breaker pole remains open on phase B during 17 ms. Recommendations in order to avoid these overvoltages are given in this paper.
Keywords :
circuit breakers; distribution networks; overvoltage protection; poles and towers; power transformer protection; circuit-breaker poles; ferroresonance phenomena; overvoltage avoidance; power transformer; voltage 110 kV; Circuit breakers; Circuit faults; Circuit testing; Ferroresonance; Inductance; Magnetic cores; Power transformers; Residual stresses; Surges; Transformer cores; Residual flux; circuit breakers; controlled switching; energization of power transformer; ferroresonance; inrush currents; strange attractor;
Conference_Titel :
Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE
Conference_Location :
Pittsburgh, PA
Print_ISBN :
978-1-4244-1905-0
Electronic_ISBN :
1932-5517
DOI :
10.1109/PES.2008.4596748
