Logic Diagram - ABB Relion Technical Manual

1MRK 502 048-UUS A
8.10.7.4
MaxPhCurr
PickupCurr
MinPh-Ph Voltage
ANSI10000214 V2 EN
Figure 128: Simplified internal logic diagram for overcurrent function
ANSI10000213 V2 EN
Figure 129: Simplified internal logic diagram for undervoltage function
8.10.7.5
Technical manual

Logic diagram

a
b
X
Voltage
control or
restraint
feature
MinPh-PhVoltage
PickupVolt
Operation_UV=Disabled
BLKUV
Undervoltage protection
The undervoltage step simply compares the magnitude of the measured voltage quantity
with the set pickup level. The undervoltage step picks up if the magnitude of the measured
voltage quantity is smaller than the set level.
DEF time
selected
a>b
Inverse
time
selected
a
b>a
b
Section 8
Current protection
0-tDef_OC
0
OR
Inverse
ANSI10000214-2-en.vsd
DEF time
0-tDef_UV
selected
0
AND
ANSI10000213-2-en.vsd
TROC
PU_OC
PU_UV
279