576LE008146B
Protection functions
4.5 Earth fault protection
ATTENTION
If an ENCT external neutral sensor is used, it is necessary to activate the neutral protection
to take into account the sum of the phase and neutral currents.
located upstream. This protection functions from the value of the Ig setting to the nominal
value In.
Adjusting the tg time delay
tsd adjustment
range (ms)
50 100 150 200 250 300 350 400 450 500 550 600
Non-tripping time
(ms)
25 75 125 175 225 275 325 375 425 475 525 575
Maximum tripping
time (ms)
100 150 200 250 300 350 400 450 500 550 600 650
Maximum break
time (ms)
120 170 220 270 320 370 420 470 520 570 620 670
The I²t earth protection curve improves the selectivity of the earth faults with circuit breakers
Trip
command
t non-tripping
tsd time delay
maximum tripping t
maximum break time
Opening of
contacts
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