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Technical Data
4.4 Time Overcurrent Protection for Residual Current
Pickup time / dropout time residual current stages
Pickup time at frequency
without inrush restraint,- 2 x Pickup Value
without inrush restraint,- 10 x Pickup Value
with inrush restraint,- 2 x Pickup Value
with inrush restraint,- 10 x Pickup Value
Dropout time, approx.
1
) for high-speed relays – 4.5 ms
Dropout to Pickup Ratios
Current stages
Inrush Restraint
Inrush restraint ratio
(2nd harmonic) Ι
Lower operation limit
Max. current for restraint
Cross-block function between phases
max. action time for cross-block
1)
Secondary values for Ι
Frequency
Frequency influence
418
1
)
1
)
1
)
/Ι
2fN
fN
= 1 A; for Ι
= 5 A the currents must be multiplied by 5.
N
N
innerhalb des Frequenznachführbereiches
50 Hz
33 ms
27 ms
1
)
42 ms
36 ms
41 ms
approx. 0.95 for Ι/Ι
10 % to 45 %
Ι > 0.2 A
1)
0.30 A to 25.00 A
1)
can be activated / deacti-
vated
0.00 s to 180.00 s
60 Hz
16,7 Hz
29 ms
76 ms
22 ms
49 ms
41 ms
104 ms
32 ms
80 ms
38 ms
81 ms
≥ 0.5
N
Increments 1 %
Increments 0.01 A
Increments 0.01 s
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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