ABB Relion 650 Series Commissioning Manual page 78

Section 10
Glossary
3I
O
3U
O
72
Three times zero-sequence current. Often referred to as the residual or
the earth-fault current
Three times the zero sequence voltage. Often referred to as the
residual voltage or the neutral point voltage
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1MRK 505 264-UEN A
Busbar protection REB650
Commissioning manual