ABB 650 series Applications Manual page 317

1MRK 511 423-UEN A
Bay control REC650 2.2 IEC
Application manual
3I
O
3U
O
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
Section 17
Glossary
311