ABB REB650 - Page 142

PICKUP
PU_ST1_A
PU_ST1_B
PU_ST1_C
PU_ST1
T R S T 1
PICKUP
P
U _
S T
2
T
R S
T
2
TRIP
Comparator
V > Pickup1
Comparator
V > Pickup1
Comparator
V > Pickup1
MaxVoltSelector
Comparator
V > Pickup2
Comparator
V > Pickup2
Comparator
V > Pickup2
Pickup
&
Trip
Output
Logic
Step 1
Pickup
&
Trip
Output
Logic
Step 2
Phase C
Phase B
Phase A
Phase C
Phase B
Phase A
Timer
t2
Voltage Phase
Selector
OpMode2
1 out of 3
2 outof 3
3 out of 3
Time integrator
t1
Voltage Phase
Selector
OpMode1
1 out of 3
2 outof 3
3 out of 3
TRIP
TRIP
OR
OR
OR
OR
OR
OR
VA or VAB
VB or VBC
VC or VCA
ANSI08000012-2-en.vsd
PICKUP
ANSI08000012 V2 EN
Figure 54: Schematic design of Two step overvoltage protection (OV2PTOV, 59)
Section 8 1MRK 505 277-UUS C
Voltage protection
136
Technical Manual