GIC Occurrences and CIC Tests for 400 KV System Transformer

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. Malfunctioning of protection circuits is also reported in the literature. The field tests made for two 463 MVA system...

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Bibliographic Details
Published in:IEEE power engineering review 2002-03, Vol.22 (3), p.63-63
Main Authors: Lahtinen, M., Elovaara, J.
Format: Article
Language:English
Subjects:
Circuit faults
Circuit testing
Circuits
dc-current
Electric potential
geomagnetic
Geomagnetism
immunity
Networks
Power system harmonics
Power system protection
Propagation losses
Reactive power
Storms
System testing
Transformer
Transformers
Voltage
Voltage control
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Description
Summary: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. Malfunctioning of protection circuits is also reported in the literature. 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 for the voltage control and voltage quality in network are also considered and results of earlier Finnish GIC risk studies are reported.
ISSN:0272-1724
1558-1705
DOI:10.1109/MPER.2002.4312089