Single-Phase Time Overcurrent Protection
Current Stages
High current stage
Ι>>
0.05 A to 35.00 A
1)
0.003 A to 1.500 A
2)
or ∞ (ineffective)
Increments 0.01 A
Increments
0.001 A
T
Ι>>
0.00 s to 60.00 s
or ∞ (no trip)
Increments 0.01 s
Definite time stage
Ι>
0.05 A to 35.00 A
1)
0.003 A to 1.500 A
2)
or ∞ (ineffective)
Increments 0.01 A
Increments
0.001 A
T
Ι>
0.00 s to 60.00 s
or ∞ (no trip)
Increments 0.01 s
Tolerances
Currents
3 % of set value or 1 % rated current for Ι
N
= 1 A or 5 A
5 % of set value or. 3 % rated current forΙ
N
= 0.1 A
Times 1 % of set value or 10 ms
The set times are pure delay times.
1)
Secondary values forΙ
N
= 1 A; for Ι
N
= 5 A
2)
Secondary values for “sensitive” measurement input, irrespective of nominal current
Operating Times
7UT612
Pickup time / dropout time
for frequency 50 Hz 60 Hz
minimum pick-up time
Pick-up time, typical
20 ms
30 ms
18 ms
25 ms
Dropout time, typical 30 ms 27 ms
7UT613/63x
Pickup time / dropout time
for frequency 50 Hz 60 Hz 16.7 Hz
Pickup time,- 2 x Pickup Value
1
)
Pickup time,- 10 x Pickup Value
1
)
18 ms
14 ms
14 ms
13 ms
16 ms
13 ms
Dropout time, approx. 27 ms 25 ms 62 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
Frequency
Frequency influence
within the frequency tagging range
4.7
Technical Data
4.7 Single-Phase Time Overcurrent Protection
SIPROTEC 4, 7UT6x, Manual 431
C53000-G1176-C230-5, Edition 09.2016
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