ABB REG650 Technical Manual page 270

Section 9
Voltage protection
264
Comparator
VA or VAB
V > Pickup1
Comparator
VB or VBC
V > Pickup1
Comparator
VC or VCA
V > Pickup1
MaxVoltSelector
Comparator
V > Pickup2
Comparator
V > Pickup2
Comparator
V > Pickup2
ANSI08000012 V2 EN
Figure 122: Schematic design of Two step overvoltage protection (OV2PTOV, 59)
Phase A
Voltage Phase
Selector
OpMode1
Phase B
1 out of 3
2 outof 3
Pickup
Phase C
3 out of 3
&
Trip
Output
Logic
PICKUP
Step 1
Time integrator
TRIP
t1
Phase A
Voltage Phase
Selector
OpMode2 Phase B
1 out of 3
2 outof 3
Pickup
Phase C
3 out of 3
&
Trip
Output
Logic
PICKUP
Step 2
Timer
TRIP
t2
1MRK 502 043-UUS B
PU_ST1_A
PU_ST1_B
PU_ST1_C
PU_ST1
OR
OR
OR
OR
PICKUP
OR
TRIP
OR
ANSI08000012-2-en.vsd
Technical Manual