ABB Relion 650 Series Commissioning Manual page 107

1MRK 511 209-UEN -
REC650
Commissioning Manual
3I Three times zero-sequence current. Often referred to as the
O
residual or the earth-fault current
3U Three times the zero sequence voltage. Often referred to as
O
the residual voltage or the neutral point voltage
Section 7
Glossary
99