Abstract
Solar storms are event that has a big range of averse outcome on technological system, power grid specifically. During extreme geomagnetic storms a GIC begin to travel between long transmission lines or conducting constructions. The possibility of solar storms features an approximately linear relation with the sun spot activity level that fluctuates in eleven years cycle. This paper could be threat examination of GIC in power system and describe the causes, the implications, each on power system apparatus level and on power system level. When GIC flow in neutral of transformer winding it start to causes the Half-cycle core saturation and produce high level of harmonics can sense bad fault situation to protective relays and mis-operation of circuit breakers. Also this paper mentioned potential risk mitigation ways
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