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

fYear

2008

fDate

20-24 July 2008

Firstpage

1

Lastpage

8

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE

Conference_Location

Pittsburgh, PA

ISSN

1932-5517

Print_ISBN

978-1-4244-1905-0

Electronic_ISBN

1932-5517

Type

conf

DOI

10.1109/PES.2008.4596748

Filename

4596748