4.4 Time Overcurrent Protection for Phase and Residual Currents
447
7UT613/63x Manual
C53000-G1176-C160-2
Trip Time Curves acc. to ANSI
Acc. to ANSI/IEEE (see also Figures 4-9 to 4-12)
The tripping times for I/I
p
≥ 20 are identical to those for I/I
p
= 20.
For residual current read 3I0p instead of I
p
and T
3I0p
instead of T
p
;
for earth faults read I
Ep
instead of I
p
and T
IEp
instead of T
p
Pickup Threshold approx. 1.10 · I
p
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