Ordinal Signal Name Use Unique ID
Description
Enables Z1 differential block mode
547 Set Z1 DifCbfBlk PFSI DDB_SET_Z1_BLOCK_DIFF_CBF
Enables Z1 Diff & CBF Block Mode
875 Idiff Trip PFSO DDB_IDIFF_TRIP
Differential current trip
876 Idiff Trip Z1 PFSO DDB_BUS_IDIFF_TRIP_Z1
Z1 Differential trip
1053 Idiff Start Z1 PFSO DDB_BUS_IDIFF_START_Z1
Z1 Differential start
1080 VT Chk Block Z1 PFSO DDB_VT_CHECK_BLOCK_ZONE1
VT Check block Z1 trip
1084 CctFail Blk Z1 PFSO DDB_CIR_FLT_Z1
Z1 Circuity fault
1089 In Test Mode PFSO DDB_Z1_IN_TEST_MODE
Z1 in Commissioning mode
1115 PhComp Blk Z1 PFSO DDB_PHASE_COMP_Z1_BLOCK
Z1 Phase comparison block (OR gate of Phase A,B,C)
1137 Diff Fault Z1 PFSO DDB_DIFF_FAULT_Z1
Z1 Current differential has a fault
1147 DiffTrp Z1 Blked PFSO DDB_DIFF_Z1_TRIP_BLOCKED
Z1 Differential trip in block status (commissioning mode active)
1151 DiffCBFTrpZ1 Blk PFSO DDB_DIFF_CBF_Z1_TRIP_BLOCKED
Z1 Differential CBF trip in block status (commissioning mode active)
3.2 TOPOLOGY REPLICA FUNCTION
This continually compares tripping commands with the status of the busbar switches in the topology. If there
is a fault, the device determines optimal tripping zones to minimise disruption to the rest of the circuitry. It
then issues tripping commands to selectively isolate the fault.
This also avoids errors if the actual position of an actuator or circuit breaker is different to that shown in the
scheme, as this could produce a differential current.
Key:
External DDB Signal
V
00714
Internal function
CB1 Not Ready
Q1 Z1 Closed
CB1 Closed
Terminal/zone dataTopology Replica
CB1 to CB18
Q
1 to Q18, Z1 to Z4
QbusSect1 Clo
Internal DDB Signal
C
B1 to CB18
Sect 1 and 2
Figure 30: Topology replica function
Chapter 5 - Protection Functions MiCOM P747
104 P747-TM-EN-1
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