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Table 259:
GRPTTR Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
MeasurCurrent
RMS
DC
-
-
DC
Measured current quantity (RMS or
Calculated DC)
CT_Location
LV_winding
HV_winding
-
-
LV_winding
Excitation transformer winding where
used CT is located
GlobalBaseSel
1 - 12
-
1
1
Selection of one of the Global Base Value
groups
UrLV
10.0 - 3000.0
V
0.1
400.0
Excitation transformer LV winding rated
Ph-Ph voltage in V
UrHV
0.10 - 100.00
kV
0.01
11.00
Excitation transformer HV winding rated
Ph-Ph voltage in kV
PhAngleShift
-180 - 180
Deg
30
30
Phase angle shift across excitation
transformer (degrees)
8.16.6
Monitored data
Table 260:
GRPTTR Monitored data
Name
Type
Values (Range)
Unit
Description
IMEAS
REAL
-
A
Measured current, used
for calculation of operate
time
IDC
REAL
-
A
Average DC current
value, used for alarm and
trip logic
THETA
REAL
-
%
Overload in percent of set
trip level (i.e. Trip=100%)
RIPPLVAL
REAL
-
%
DC ripple as percent of
measured DC current
8.16.7
Operation principle
The rotor overload protection GRPTTR can be illustrated in five separate sub-blocks,
see Figure
.
Section 8
1MRK502052-UEN B
Current protection
466
Technical manual
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