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4.7
Single-Phase Time Overcurrent Protection
Current Stages
High current stage
Definite time stage
Tolerances
Currents
Times
The set times are pure delay times.
Secondary values forΙ
1)
2)
Secondary values for "sensitive" measurement input, irrespective of nominal current
Operating Times
7UT612
Pickup time / dropout time
for frequency
minimum pick-up time
Pick-up time, typical
Dropout time, typical
7UT613/63x
Pickup time / dropout time
for frequency
Pickup time,- 2 x Pickup Value
Pickup time,- 10 x Pickup Value
Dropout time, approx.
1)
For high-speed relays, the pick-up times decrease by 4.5 ms
Dropout to Pickup Ratios
Current stages
Frequency
Frequency influence
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
Ι>>
0.05 A to 35.00 A
0.003 A to 1.500 A
or ∞ (ineffective)
T
0.00 s to 60.00 s
Ι>>
or ∞ (no trip)
Ι>
0.05 A to 35.00 A
0.003 A to 1.500 A
or ∞ (ineffective)
T
0.00 s to 60.00 s
Ι>
or ∞ (no trip)
3 % of set value or 1 % rated current for Ι
5 % of set value or. 3 % rated current forΙ
1 % of set value or 10 ms
= 1 A; for Ι
= 5 A
N
N
1
)
1
)
approx. 0.95 for Ι/Ι
within the frequency tagging range
4.7 Single-Phase Time Overcurrent Protection
Increments 0.01 A
1)
Increments
2)
0.001 A
Increments 0.01 s
Increments 0.01 A
1)
Increments
2)
0.001 A
Increments 0.01 s
= 1 A or 5 A
N
= 0.1 A
N
50 Hz
60 Hz
20 ms
18 ms
30 ms
25 ms
30 ms
27 ms
50 Hz
60 Hz
16.7 Hz
18 ms
14 ms
16 ms
14 ms
13 ms
13 ms
27 ms
25 ms
62 ms
≥ 0.5
N
Technical Data
431
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