ABB Relion 670 Series Technical Reference Manual page 586

Section 10
Multipurpose protection
580
Selected current
Selected restraint current
Selected voltage
UC1
nd
2 Harmonic
restraint
UC2
nd
2 Harmonic
restraint
OC1
nd
2 Harmonic
restraint
OR
Current restraint
Directionality
Voltage control /
restraint
OC2
nd
2 Harmonic
restraint
Current restraint
OR
Directionality
Voltage control /
restraint
OV1
OV2
UV1
UV2
en05000170_ansi.vsd
1MRK505222-UUS C
CURRENT
TRUC1
PU_UC2
TRUC2
PU_OC1
TROC1
BLK2ND
DIROC1
PU_OC2
TROC2
VDIRLOW
DIROC2
PU_OV1
TROV1
PU_OV2
TROV2
PU_UV1
TRUV1
PU_UV2
TRUV2
VOLTAGE
Technical reference manual