ABB Relion 670 Series Commissioning Manual page 282

Section 15
Glossary
3I
O
3V
O
276
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 506 371-UUS E
Line distance protection REL670
Commissioning manual