Title :
Transformer failures in regions incorrectly considered to have low GIC-risk
Author :
Gaunt, C.T. ; Coetzee, G.
Author_Institution :
Dept. of Electr. Eng., Univ. of Cape Town, Cape Town
Abstract :
A close association has been identified between the theoretical calculation of geomagnetically induced currents (GICs) in a large network, practical measurements of GICs, the results of dissolved gas analysis (DGA) records, and damage in recently failed transformers in Southern Africa. Together these indicate that GICs may contribute significantly to transformer failures on large transmission systems in mid-latitude regions, where GICs are generally thought not to be significant.
Keywords :
power transformers; power transmission faults; dissolved gas analysis records; failure analysis; geomagnetically induced currents; large transmission systems; mid-latitude regions; power transformers; Africa; Earth; Geomagnetism; Magnetic field measurement; Power generation; Power system harmonics; Power systems; Power transformer insulation; Power transformers; Storms; Failure analysis; Geomagnetically induced currents; Power transformers;
Conference_Titel :
Power Tech, 2007 IEEE Lausanne
Conference_Location :
Lausanne
Print_ISBN :
978-1-4244-2189-3
Electronic_ISBN :
978-1-4244-2190-9
DOI :
10.1109/PCT.2007.4538419
