IG-150-EN version 04; 03/10/16
80
Protection functions. Description and settings
General instructions
ekor.rps
4.11. High current lockout
4.11.1. Description
There are two other instantaneous settings groups, one
for phases and other for neutral (not for sensitive neutral).
They are different from the usual ones for the two following
characteristics:
If they give a trip, it will be moved on to definitive trip’
The number of trip is programmable (1 to 4) within the
sequence of running cycle from which the function is active.
4.11.2. Setting (table 0, single)
They are accessible through keyboard/display in "table 0" -
"protection" – “high current lockout", or through console in
“overcurrent protection (3)” and they are:
1. “Phase high current lockout”
a. Phase enable: YES/NO
b. Trip number: 1 to 4
c. Pickup: 0.1 to 200 A
d. Additional time: 0 to 60 s
2. “Neutral high current lockout”
a. Neutral enable: YES/NO
b. Trip number: 1 to 4
c. Pickup: 0.1 to 100 A
d. Additional time: 0 to 60 s
4.12. Cold load pickup
4.12.1. Description
This function aims to avoid non wished trips in the following
situation: After being the line de-energized for a period of time
and re-energized later, the load can exceed the protection
setting without the presence of a fault. This may be due to
the accumulative inrush current caused when connecting all
the loads (furnaces, heaters, coolers, etc.) at the same time.
This phenomena can occur not only at the moment of the
breaker manual closing, after having remained open for a
certain time, but also with the breaker permanently closed
due to the operation of another upstream breaker.
What the function does is detecting when those conditions
are given and changing the tripping settings during a
programmable time
.
The function is activated when the current in the 3 phases
is below 10 mA, then the programmed time starts to run to
determine that the load is “cold” (this time can be 0, what
means that any circuit breaker opening leads to the cold
load situation). Once that time has expired and the current
has not exceed again 12 mA, the protection usual setting
values are replaced by the cold load pickup ones. When
any of the phase current exceed 12 mA, a counter with
programmable time starts, during which the setting are the
cold load pickup ones, when expiring this time, the setting
are again the usual ones.
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