PICKUP
ST1L1
ST1L2
ST1L3
TR1L1
TR1L2
TR1L3
ST1
TR1
PICKUP
ST2L1
ST2L2
ST2L3
TR2L1
TR2L2
TR2L3
ST2
TR2
TRIP
Comparator
VL1 < V1<
Comparator
VL2 < V1<
Comparator
VL3 < V1<
MinVoltSelector
Comparator
VL1 < V2<
Comparator
VL2 < V2<
Comparator
VL3 < V2<
MinVoltSelector
Pickup
&
Trip
Output
Logic
Step 1
Pickup
&
Trip
Output
Logic
Step 2
Phase 3
Phase 2
Phase 1
Phase 3
Phase 2
Phase 1
Time integrator
tIReset2
ResetTypeCrv2
Voltage Phase
Selector
OpMode2
1 out of 3
2 out of 3
3 out of 3
Time integrator
tIReset1
ResetTypeCrv1
Voltage Phase
Selector
OpMode1
1 out of 3
2 out of 3
3 out of 3
VL1
VL2
VL3
TRIP
TRIP
OR
OR
OR
OR
OR
OR
PICKUP
IntBlkStVal1
t1
t1Reset
IntBlkStVal2
t2Reset
t2
ANSI05000012-2-en.vsd
ANSI05000012 V2 EN
Figure 255:
Schematic design of Two step undervoltage protection UV2PTUV (27)
Section 8
1MRK505222-UUS C
Voltage protection
500
Technical reference manual
Summary of Contents for Relion 670 series
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