START
ST1L1
ST1L2
ST1L3
TR1L1
TR1L2
TR1L3
ST1
TR1
START
ST2L1
ST2L2
ST2L3
TR2L1
TR2L2
TR2L3
ST2
TR2
TRIP
Comparator
UL1 < U1<
Comparator
UL2 < U1<
Comparator
UL3 < U1<
MinVoltSelector
Comparator
UL1 < U2<
Comparator
UL2 < U2<
UL3 < U2<
MinVoltSelector
Start t1
&
Trip
Output
Logic
Step 1
Start t2
&
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
UL1
UL2
UL3
TRIP
TRIP
OR
OR
OR
OR
OR
OR
START
IntBlkStVal1
t1Reset
IntBlkStVal2
t2Reset
IEC05000834-2-en.vsd
Comparator
IEC05000834 V2 EN
Figure 233:
Schematic design of Two step undervoltage protection UV2PTUV
Section 9
1MRK502052-UEN B
Voltage protection
490
Technical manual
Summary of Contents for Relion REG670
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