4
SEL Application Guide 2015-33
Date Code 20151102
Step 6
Select the
Configuration Settings
menu and ensure that
Factory Logic
is set to
Y
, as shown in
Figure 5 Configuration Settings
Step 7
Select the
Phase Instantaneous Overcurrent
menu and set
Maximum Phase IOC 1 Pickup
(50P1P)
equal to the phase instantaneous pickup, as shown in Figure 6. The instantaneous delay
can be adjusted using
Maximum Phase IOC 1 Delay (50P1D)
. Modifications to factory logic
are necessary to set the instantaneous delay below 0.10 seconds.
Repeat this process for instantaneous ground fault protection by selecting the
Residual
Instantaneous Overcurrent
menu and setting
Residual IOC 1 Pickup (50G1P)
and
Residual
IOC 1 Delay (50G1D)
. The phase and residual instantaneous overcurrent settings should be
determined by a power system protective device coordination study.
Figure 6 Instantaneous Overcurrent Settings
