ABB Relion 670 Series Technical Reference Manual page 519

1MRK505222-UUS C
Technical reference manual
Comparator
VA >
Pickup 1
Comparator
VB
VB >
Pickup 1
Comparator
VC >
Pickup 1
MaxVoltSelect
Comparator
VA >
Pickup 2
Comparator
VB >
Pickup 2
Comparator
VC >
Pickup 2
MaxVoltSelect
ANSI05000013 V2 EN
Figure 263: Schematic design of Two step overvoltage protection OV2PTOV (59)
Phase A
Voltage Phase
Selector
OpMode1 Phase B
1 out of 3
Pickup
2 out of 3
t1
Phase C
3 out of 3
t1Reset
&
Phase C Trip
Output
Logic
PICKUP
Step1
Time integrator TRIP
tIReset1
ResetTypeCrv1
Voltage Phase
Phase A
Selector
OpMode2
Phase B
1 out of 3
2 out of 3
Pickup
3 out of 3
Phase C
t2
t2Reset
&
Trip
Output
PICKUP
Logic
Step 2
Time integrator
TRIP
tIReset2
ResetTypeCrv2
Section 8
Voltage protection
PU_ST1_A
PU_ST1_B
PU_ ST1_C
PU_ST1
OR
TRST1-A
TRST1_B
TRST1_C
TRST1
OR
PU_ST2_A
PU_ST2_B
PU_ST2_C
PU_ST2
OR
TRST2-A
TRST2-B
TRST2-C
TRST2
OR
PICKUP
OR
TRIP
OR
ANSI05000013-2-en.vsd
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