ABB RES670 Technical Manual page 290

Section 9
Voltage protection
284
Comparator
VA
VA < V1<
Comparator
VB
VB < V1<
Comparator
VC
VC < V1<
MinVoltSelector
Comparator
VA < V2<
Comparator
VB < V2<
Comparator
VC < V2<
MinVoltSelector
ANSI05000012 V3 EN-US
Figure 95: Schematic design of Two step undervoltage protection UV2PTUV (27)
Voltage Phase
Phase 1
Selector
OpMode1
Phase 2
1 out of 3
2 out of 3 Pickup
3 out of 3 t1
Phase 3
t1Reset
IntBlkStVal1
&
Trip
Output
PICKUP
Logic
Step 1
Time integrator
TRIP
tIReset1
ResetTypeCrv1
Voltage Phase
Phase 1
Selector
OpMode2
Phase 2
1 out of 3 Pickup
2 out of 3
t2
3 out of 3
Phase 3
t2Reset
IntBlkStVal2
&
Trip
Output
Logic
PICKUP
Step 2
Time integrator
TRIP
tIReset2
ResetTypeCrv2
Phasor measurement unit RES670 2.2 ANSI
1MRK 511 408-UUS A
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
ANSI05000012-3-en.vsd
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