GIC occurrences and GIC test 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. Also, malfunctioning of protection circuits is reported in this paper. The field tests made for two 463 MVA system tr...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2002-04, Vol.17 (2), p.555-561
Main Authors: Lahtinen, M., Elovaara, J.
Format: Article
Language:English
Subjects:
Circuit faults
Circuit testing
Circuits
Electric potential
Geomagnetism
Networks
Power system harmonics
Power system protection
Propagation losses
Reactive power
Storms
System testing
Transformers
Voltage
Voltage control
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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. 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.
ISSN:0885-8977
1937-4208
DOI:10.1109/61.997938