VAMP Ltd
Arc protection system
Technical description
VAMP 221
VM221.EN013
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63
6.3.
Protection stages
NOTE!
See Chapter 2.1 for description.
6.3.1.
Arc (fault) protection
L1/L3 setting stage
Start current
0.5…6*I
n
Operating time
7 ms
Detection period
Resetting period
2 ms
30 ms
L2/I
0
setting stage
Start current
0.05…5* I
n
Operating time
7 ms
Detection period
Resetting period
2 ms
30 ms
6.3.2.
Circuit breaker failure protection stage (50BF)
Monitored relay
One relay in the tripping group
(Trip 2 or Trip 4)
Operating time
100 ms or 150 ms
6.4.
Unbalance alarm
Detecting limit
90%
Operating time
10 s