ABB REG670 - Page 594

UC2
UC1
CURRENT
TRUC1
STUC2
TRUC2
STOC1
BLK2ND
STOC2
TROC2
OV1
STOV1
TROV1
OV2
STOV2
TROV2
UV1
STUV1
TRUV1
UV2
STUV2
TRUV2
Selected current
Selected restraint current
en05000170.vsd
Selected voltage
³1
³1
UDIRLOW
TROC1
OC1
2
nd
Harmonic
restraint
Current restraint
Directionality
Voltage control /
restraint
OC2
2
nd
Harmonic
restraint
Current restraint
Directionality
Voltage control /
restraint
DIROC2
DIROC1
2
nd
Harmonic
restraint
2
nd
Harmonic
restraint
VOLTAGE
IEC05000170 V1 EN
Figure 279: CVGAPC function main logic diagram for built-in protection elements
Section 11 1MRK502052-UEN B
Multipurpose protection
588
Technical manual