Title :
GIC occurrences and GIC test for 400 kV system transformer
Author :
Lahtinen, Matti ; Elovaara, Jarmo
Author_Institution :
Fingrid Oyj, Helsinki, Finland
fDate :
4/1/2002 12:00:00 AM
Abstract :
The geomagnetic induced currents in a transmission network may saturate transformers and cause additional losses, a high level of harmonics, and a lack of reactive power in the grid. Also, malfunctioning of protection circuits is reported in this paper. The field tests made for two 463 MVA system transformers show that tested transformers may tolerate very high DC currents for times typical to geomagnetic storms. The effects of the voltage control and voltage quality in network are also considered, and results of earlier Finnish GIC risk studies are reported
Keywords :
geomagnetism; magnetic storms; power supply quality; power system control; power transformer testing; voltage control; 400 kV; 463 MVA; Finnish GIC risk studies; GIC occurrences; GIC test; geomagnetic induced currents; geomagnetic storms; harmonics; high DC currents tolerance; immunity; losses; protection circuits malfunctioning; reactive power; transformers saturation; transmission network; voltage control; voltage quality; Circuit faults; Circuit testing; Geomagnetism; Power system harmonics; Power system protection; Propagation losses; Reactive power; Storms; System testing; Voltage control;
Journal_Title :
Power Delivery, IEEE Transactions on
