North Europe power transmission system vulnerability during extreme space weather | Journal of Space Weather and Space Climate

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Table 2

K coefficients for different types of transformer core design (Dong, 2002).

K1 (Mvar/A)^*	Transformer core design
1.18	Single phase
0.33	Three-phase shell form
0.29	Three-phase, three-legged, core form
0.66	Three-phase, five-legged, core form

Volt-ampere reactive (var) is a unit by which reactive power is expressed in an AC electric power system.

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