ABB Relion 670 Series Applications Manual page 151

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1MRK 505 370-UUS Rev. K

From Equation

system, when only positive sequence current component exist. For any unbalanced condition (that is,

external or internal fault), both negative and zero sequence current components will give their own

contribution to the summated current.

Busbar protection REB670

Application manual

it is obvious that the ASCT rated ratio is declared for balanced three phase current

Differential protection

Relion reb670