ABB Relion 650 Series Technical Manual page 128

Section 7
Secondary system supervision
122
DUDI Detection
DUDI detection Phase 1
IL1
IL2
IL3
DI<
UL1
DU detection based on sample analysis
DU>
a
b
UPh>
IL1
DUDI detection Phase 2
IL2
IL3
UL2
IL1
DUDI detection Phase 3
IL2
IL3
UL3
UL1
a
a<b
b
IL1
a
a>b
b
IPh>
CBCLOSED
UL2
a
a<b
b
IL2
a
a>b
b
UL3
a
a<b
b
IL3
a
a>b
b
IEC12000166 V3 EN-US
Figure 49: Simplified logic diagram for the DU/DI detection part
DI detection based on sample analysis
1.5 cycle 20 ms
a>b
t
t
Same logic as for phase 1
Same logic as for phase 1
AND
OR
AND
AND
OR
AND
AND
OR
AND
1MRK 511 424-UEN B
OR
AND
AND
OR
AND
OR
AND
OR FuseFailDetDUDI
AND
IEC12000166-3-en.vsd
Bay control REC650 2.2 IEC
Technical manual
DeltaIL1
DeltaUL1
DeltaIL2
DeltaUL2
DeltaIL3
DeltaUL3