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
