HV Transformer Protection and Stabilization under Geomagnetically Induced Currents

Daniel Bejmert, Klaus Boehme, Matthias Kereit and Waldemar Rebizant
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Daniel Bejmert: Faculty of Electrical Engineering, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland
Klaus Boehme: Siemens AG, 13629 Berlin, Germany
Matthias Kereit: Siemens AG, 13629 Berlin, Germany
Waldemar Rebizant: Faculty of Electrical Engineering, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland

Energies, 2020, vol. 13, issue 18, 1-13

Abstract: This paper presents the results of research related to the issues arising from DC excitation of power transformers due to geomagnetically induced currents (GIC). First, the GIC phenomena and their influence on power system operation are discussed. Then, a recorded case of tripping of the transformer differential protection due to geomagnetic disturbances (GD), as well as simulation signals from a developed model of a transformer subjected to a GD are analyzed. Next, two algorithms for GIC detection utilizing the rate of change of transformer differential currents and the DC component in the neutral current are proposed, thoroughly tested, and recommended.

Keywords: power transformer; differential protection; protection stabilization; geomagnetically induced current; geomagnetic disturbance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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