Siemens SIPROTEC 4 7UT6 Series - Page 418

Pickup time / dropout time residual current stages
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
)
33 ms
27 ms
29 ms
22 ms
76 ms
49 ms
with inrush restraint,- 2 x Pickup Value
1
)
with inrush restraint,- 10 x Pickup Value
1
)
42 ms
36 ms
41 ms
32 ms
104 ms
80 ms
Dropout time, approx. 41 ms 38 ms 81 ms
1
) for high-speed relays – 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
Cross-block function between phases can be activated / deacti-
vated
max. action time for cross-block 0.00 s to 180.00 s Increments 0.01 s
1)
Secondary values for Ι
N
= 1 A; for Ι
N
= 5 A the currents must be multiplied by 5.
Frequency
Frequency influence
innerhalb des Frequenznachführbereiches
Technical Data
4.4 Time Overcurrent Protection for Residual Current
418 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016