4.4 Time Overcurrent Protection for Phase and Residual Currents
443
7UT613/63x Manual
C53000-G1176-C160-2
Operating Times of the Definite Time Stages
Dropout to Pickup Ratios
Inrush Restraint
Frequency
times
5% ± 15 ms
5% ± 45 ms
at f
N
= 50/60 Hz
at f
N
= 16.7 Hz
for 2 ≤ I/I
P
≤ 20
and T
IP
/s ≥ 1;
or 2 ≤ I/3I
0P
≤ 20
and T
3I0P
/s ≥ 1
Tolerances with definite time (ANSI)
2)
times
5% ± 15 ms
5% ± 45 ms
at f
N
= 50/60 Hz
for f
N
= 16.7 Hz
for 2 ≤ I/I
P
≤ 20
for 2 ≤ I/I
P
≤ 20
and D
IP
/s ≥ 1;
and D
3I0P
/s ≥ 1
The set times are pure delay times.
1)
Secondary values for I
N
= 1 A; for I
N
= 5 A the currents must be multiplied by 5.
2)
With one 3-phase measuring location and I/I
N
= 1 A/5 A
Pickup time / dropout time phase current stages
Pickup time at frequency 50 Hz 60 Hz 16.7 Hz
without inrush restraint, min. 11 ms 11 ms 16 ms
with inrush restraint, min. 33 ms 29 ms 76 ms
Dropout time, approx. 35 ms 35 ms 60 ms
Pickup time / dropout time residual current stages
Pickup time at frequency 50 Hz 60 Hz 16.7 Hz
without inrush restraint, min.
1
) 21ms 19ms 46ms
with inrush restraint, min.
1
) 31ms 29ms 56ms
Dropout time, approx. 45 ms 43 ms 90 ms
1
) for high-speed relays – 4.5 ms
Current stages approx. 0.95 for I/I
N
≥ 0.5
Inrush restraint ratio
(2nd harmonic) I
2fN
/I
fN
10 % to 45 % Steps 1 %
Lower operation limit I >0.2A
1)
Max. current for restraint 0.30 A to 25.00 A
1)
Steps 0.01 A
Cross-block function between phases can be activated / deacti-
vated
max. action time for cross-block 0.00 s to 180.00 s Steps 0.01 s
1)
Secondary values for I
N
= 1 A; for I
N
= 5 A the currents must be multiplied by 5.
Frequency influence within the frequency tagging range
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