Relay#1 setting: the pickup current setting considers the all load connection
with feeder#5. The normal current of 65 A flows through relay#1, according to the
fact that maximum load is connected in feeder#5. The pickup current calculation
should consider two factors including the pickup current on phase and ground sides.
The pickup current calculation determines from equation (1) and (2). Then, the
current setting of the relay is obtained by using equation (3). Relay#1 sets 200 % to
provide the load from increasing in the future. Relay#2 determines 150 % for the
phase side protection, which the ground protection is 30 %. The current setting and
dial time are given on Table XII that time margin is added. See more on the Appendix
47
for how to set the current setting, and time-current characteristic curves selection on
the DigSILENT power factory.