Figure 356: Operating curve of “OvExt IDMT Crv4” based on the specified
settings. The two dots marked on the curve are referred to in the text.
If the excitation level stays at 1.25, the operation occurs after 15200
milliseconds. At the excitation level of 1.42, the time to operation would be
5900 milliseconds as per the two dots in
Figure 356
. In this case, the setting
Maximum operate time
3600000 milliseconds does not limit the maximum
operate time because the operate time at Start value = 110% (1.1 pu) is
approximately 75000 milliseconds.
4.5.8.7 Signals
Table 640: OEPVPH 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-phase se-
quence current
U_A_AB SIGNAL 0 Phase-to-earth volt-
age A or phase-to-
phase voltage AB
Table continues on the next page
Protection functions 1MRS757644 H
684 620 series
Technical Manual
To Next Page
Loading...
