ABB REG670 - Page 509

START
ST1L1
ST1L2
ST1L3
TR1L1
TR1L2
TR1L3
ST1
TR1
START
ST2L1
ST2L2
ST2L3
TR2L1
TR2L2
TR2L3
ST2
TR2
S
T
A R
T
TRIP
Comparator
UL1 > U1>
Comparator
UL2 > U1>
Comparator
UL3 > U1>
MaxVoltSelect
Comparator
UL1 > U2>
Comparator
UL2 > U2>
Comparator
UL3 > U2>
MaxVoltSelect
Start
t1
t1Reset
&
Trip
Output
Logic
Step 1
Start
t2
t2Reset
&
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
IEC05000013-2-en.vsd
IEC05000013-WMF V2 EN
Figure 241: Schematic design of Two step overvoltage protection OV2PTOV
1MRK502052-UEN B Section 9
Voltage protection
503
Technical manual