ABB Relion 670 series - Page 743

IA
VA
a
b
a>b
t
1.5 cycle
AND
DVDI detection Phase 1
VPPU
DVDI detection Phase 2
Same logic as for phase 1
IA
VB
DVDI detection Phase 3
Same logic as for phase 1
IA
VC
a
b
a<b
VA
IA
a
b
a>b
50P
AND
AND
52A
OR
OR
AND
a
b
a<b
VB
IB
a
b
a>b
AND
AND
OR
OR
AND
a
b
a<b
VC
IC
a
b
a>b
AND
AND
OR
OR
AND
AND
FuseFailDetDVDI
DVDI Detection
DeltaIA
DeltaVA
DeltaIB
DeltaVB
DeltaIC
DeltaVC
ANSI12000166-3-en.vsd
DVPU
DIPU
DI detection based on sample analysis
DV detection based on sample analysis
t
20 ms
IC
IB
IC
IB
IC
IB
ANSI12000166 V3 EN-US
Figure 392: Simplified logic diagram for the DV/DI detection part
1MRK 502 066-UUS B Section 13
Secondary system supervision
737
Technical manual