ABB Relion 620 Series - Page 733

If the measuring errors are not compensated for, the underpower setting
should not be lower than the sum of the current-measuring and voltage-
measuring errors.
For example, if the error of the current-measuring device is 2% and that
of the voltage-measuring device is 1%, the minimum setting is (2 + 1)% =
3%.
4.8.1.6 Signals
Table 692: DUPPDPR Input signals
Name Type Default Description
I_A SIGNAL 0 Phase A current
I_B SIGNAL 0 Phase B current
I_C SIGNAL 0 Phase C current
I
1
SIGNAL 0 Positive sequence
current
U_A_AB SIGNAL 0 Phase-to-earth volt-
age A or phase-to-
phase voltage AB
U_B_BC SIGNAL 0 Phase-to-earth volt-
age B or phase-to-
phase voltage BC
U_C_CA SIGNAL 0 Phase-to-earth volt-
age C or phase-to-
phase voltage CA
U
1
SIGNAL 0 Positive phase se-
quence voltage
DISABLE BOOLEAN 0=False Signal to block the
function during gen-
erator startup
BLOCK BOOLEAN 0=False Block signal for acti-
vating the blocking
mode
Table 693: DUPPDPR Output signals
Name Type Description
OPERATE BOOLEAN Operate
START BOOLEAN Start
4.8.1.7 Settings
Table 694: DUPPDPR Group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
Start value 0.01...2.00 xSn 0.01 0.10 Start value
Operate delay time 40...300000 ms 10 40 Operate delay time
1MRS757644 H Protection functions
620 series
Technical Manual
733