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4.6
Dynamic Cold Load Pickup
Timed changeover of settings
Controlled elements
Initiation criteria
Time control
Current control
Setting Ranges / Increments
Current Control
Time Until Changeover To Dynamic Settings
T
CB OPEN
Period Dynamic Settings are Effective After a
Reclosure T
Active
Fast Reset Time T
Dynamic Settings of Pickup Currents and
Time Delays or Time Multipliers
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
for I
= 1 A 0.04 A to 1.00 A
Nom
for I
= 5 A 0.20 A to 5.00 A
Nom
Stop
Non-directional time overcurrent protection (separate phase
and ground settings) 50(N), 51(N)
Current criterion BkrClosed I MIN
Interrogation of the circuit breaker position
Binary input
3 time elements
(T
, T
, T
CB Open.
Active
Stop)
Current threshold BkrClosed I MIN (reset on current falling
below threshold: monitoring with timer)
0 s to 21600 s (= 6 h)
1 s to 21600 s (= 6 h)
1 s to 600 s (= 10 min) or ∞ (fast reset inactive) Increments 1 s
Adjustable within the same ranges and with the same incre-
ments as the directional and non-directional time overcurrent
protection
Technical Data
4.6 Dynamic Cold Load Pickup
Increments
0.01 A
Increments 1 s
Increments 1 s
375
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