ABB Relion 670 Series Technical Reference Manual page 531

1MRK505222-UUS C
8.3.3
Technical reference manual
Comparator
V
N
VN >
Pickup 1
Time integrator
tIReset1
ResetTypeCrv1
Comparator
VN >
Pickup2
Time integrator
tIReset2
ResetTypeCrv2
ANSI05000748 V2 EN
Figure 270: Schematic design of Two step residual overvoltage protection
ROV2PTOV (59N)
Function block
ROV2PTOV (59N)
V3P* TRIP
BLOCK TRST1
BLKTR1 TRST2
BLK1 PICKUP
BLKTR2 PU_ST1
BLK2 PU_ST2
ANSI06000278-2-en.vsd
ANSI06000278 V2 EN
Figure 271: ROV2PTOV (59N) function block
Phase 1
Pickup
PICKUP
t1
tReset1
&
Trip
Output
TRIP
Logic
Step 1
Phase 1
Pickup
t2
tReset2
PICKUP
&
Trip
Output
TRIP
Logic
Step 2
Section 8
Voltage protection
PU ST1
_
TRST1
PU _ ST2
TRST2
PICKUP
OR
TRIP
OR
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