The Cold Load Pickup modifier increases the
Minimum Trip/Low Current Cutoff
values of the
Time Overcurrent
elements in the active profile configuration when
power is first restored after an extended outage. The modifier values start ramping up
from 100% when the outage duration exceeds the
T1 – Start Applying Modifier after
Outage
Timer
. The ramp-up reaches maximum value at the end of the
T2 – Ramp to
Full Modifier Value after T1
Timer
. When power is restored and all poles are closed,
the modifier begins ramping down when the
T3 – Start Ramping Modifier Down after
Return
Timer
expires. The modifier returns to the 100% level when the
T4 – Modifier
Completely Off after T3
Timer
expires. See Figure 60 on page 110.
Cold Load Pickup
Figure 59. The
Setup>Protection>Closing Profile 2>Closing Profile 2 – Current>Closing
Profile Main
screen.
The Second Closing Profile is typically implemented when difficulties such as false trips
are encountered during closing using the First Closing Profile. The Second Closing Profile
is set up in the same manner as the First Closing Profile. See Figure 59.
Closing Profile 2
Configuration
S&C Instruction Sheet 766-530 109
Protection Setup
