ABB Relion 670 Series Commissioning Manual page 250

Section 15
Glossary
3I
O
3V
O
244
Three times zero-sequence current.Often referred to as the residual or the
ground-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 511 403-UUS Rev. K
Bay control REC670
Commissioning manual