Functional Diagrams For Protection - ABB RELION 615 Series Applications Manual

Section 3
REG615 standard configurations
3.5.3.1
106

Functional diagrams for protection

The functional diagrams describe the protection functionality of the relay in detail and
according to the factory set default connections.
Three non-directional and two directional overcurrent stages are offered for detecting
phase faults in generators. In addition, one instance of voltage-dependent overcurrent
protection is also provided which can be used as a backup protection against phase
faults. During certain conditions, the fault current for three-phase faults may be less
than full load current of the generator. This may not get noticed by phase overcurrent
protection, but the fault causes generator terminal voltage to drop. Voltage dependent
overcurrent protection can be used to detect and operate such faults.
INRPHAR1_BLK2H
INRPHAR1_BLK2H
PHIPTOC1_OPERATE
PHLPTOC1_OPERATE
PHHPTOC1_OPERATE
GUID-610CEE81-AAC6-4973-AED7-471797835790 V2 EN
Figure 137: Non directional overcurrent protection function
SEQSPVC1_FUSEF_U
GUID-65AF5BBF-1F2B-482A-8377-880F152EBABE V2 EN
Figure 138: Voltage dependent overcurrent protection function
The output BLK2H of three-phase inrush detector INRPHAR1 either blocks the
function or multiplies the active settings for any of the available overcurrent or earth-
fault function blocks. In the configuration, INRPHAR1 blocks the high and
instantaneous stage of non-directional overcurrent protection.
PHIPTOC1
BLOCK OPERATE
ENA_MULT START
PHHPTOC1
BLOCK OPERATE
ENA_MULT START
PHLPTOC1
BLOCK OPERATE
ENA_MULT START
OR6
B1 O
B2
B3
B4
B5
B6
PHPVOC1
BLOCK OPERATE
ENA_MULT START
ENA_LOW_LIM
1MRS758272 B
PHIPTOC1_OPERATE
PHIPTOC1_START
PHHPTOC1_OPERATE
PHHPTOC1_START
PHLPTOC1_OPERATE
PHLPTOC1_START
PHxPTOC_OPERATE
PHPVOC1_OPERATE
PHPVOC1_START
REG615
Application Manual