The set times are pure delay times.
1)
Secondary values for
Ι
N
= 1 A; for
Ι
N
= 5 A the currents must be multiplied by 5.
Operating Times of the Definite Time Stages
7UT612
Pickup time / dropout time
Pickup time at frequency
50 Hz
60 Hz
without inrush restraint, min.
without inrush restraint, typical
20 ms
25 ms
18 ms
23 ms
with inrush restraint, min.
with inrush restraint, typical
40 ms
45 ms
35 ms
40 ms
Dropout time, typical
30 ms
30 ms
7UT613/63x
Pickup time / dropout time
Pickup time at frequency
50 Hz
60 Hz
16.7 Hz
without inrush restraint,- 2 x Pickup Value
1
)
without inrush restraint,- 10 x Pickup Value
1
)
25 ms
17 ms
23 ms
14 ms
45 ms
17 ms
with inrush restraint,- 2 x Pickup Value
1
)
with inrush restraint,- 10 x Pickup Value
1
)
43 ms
35 ms
41 ms
31 ms
108 ms
78 ms
Dropout time, approx.
33 ms
29 ms
53 ms
1
) For high-speed relays, the pick-up times decrease by 4.5 ms
Dropout to Pickup Ratios
Current stages
approx. 0.95 for
Ι
/
Ι
N
≥ 0.5
Inrush Restraint
Inrush restraint ratio
(2nd harmonic)
Ι
2fN
/
Ι
fN
10 % to 45 %
Increments 1 %
Lower operation limit
Ι
> 0.2 A
1)
Max. current for restraint
0.30 A to 25.00 A
1)
Increments 0.01 A
1)
Secondary values for
Ι
N
= 1 A; bei
Ι
N
= 5 A the currents must be multiplied by 5.
Frequency
Frequency influence
within the frequency tagging range
Technical Data
4.5 Time Overcurrent Protection for Earth Current
SIPROTEC 4, 7UT6x, Manual
429
C53000-G1176-C230-5, Edition 09.2016
Summary of Contents for SIPROTEC 4 7UT6 Series
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