Siemens siprotec 7SA6 User Manual page 432

Functions
Maximum Fault
Current
6-250
The values for the negative fault location and the overflow must be set as large as
possible since the linear transmission range of the fault location values ends 0.5 mA
below the smallest of these values.
Set in Addresses  7PD[ 287387 % ,  7PD[ 287387 % ,  7PD[
287387 ' or  7PD[ 287387 ' for how long the valid fault location is to
be delayed. If a new fault occurs, the fault location is updated. Having set the value to
∞ the transmission of the last fault location will not be interrupted until a further one is
calculated.
Example:
The fault location must be output in kilometers at mounting location "B" via the analog
output 2. At a value of 20 mA the device must indicate 50 km. For a fault in reverse
direction a value of 19.84 mA should be indicated, in the event of overflow a value of
22.5 mA. The value must be output for a time period of 5 s provided that no fault
occurs in the meantime.
Settings:
Address   P$ %
Address  1(* 9$/8( % =   mA,
Address  29(5)/2: % =  mA,
Address  7PD[ 287387 % =  s.
In this case the fault location values can be output up to 19.84 mA – 0.5 mA =
19.34 mA. Theoretically, this corresponds to a value of 48.35 km.
Set the conversion factor and the maximum output time for the maximum fault current:
For Analog output 1 at mounting location "B" (Port B1):
Address   P$ %
Address  7PD[ 287387 % = maximum output time of the value.
For Analog output 2 at mounting location "B" (Port B2):
Address   P$ %
Address  7PD[ 287387 % = maximum output time of the value;
for Analog output 1 at mounting location "D" (Port D1):
Address   P$ '
Address  7PD[ 287387 ' = maximum output time of the value;
for Analog output 2 at mounting location "D" (Port D2):
Address   P$ '
Address  7PD[ 287387 ' = maximum output time of the value;
If the maximum output time value is set to ∞, the transmission of the last fault current
will not be interrupted until a further one is calculated.
The maximum value is 22.0 mA. In case there is an overflow (value is outside of the
maximal permissible threshold), then 22.5 mA is output.
Example:
The fault current must be output in mounting location "D" via analog output 2. 20 mA
corresponds to a value of 20000 A. The value must be output for a time period of 5 s
provided that no fault occurs in the meantime.
 km,
value in Amps to be indicated at 20 mA
value in Amps to be indicated at 20 mA
value in Amps to be indicated at 20 mA
value in Amps to be indicated at 20 mA
7SA6 Manual
C53000-G1176-C133-1