Overexcitation Protection
Setting Ranges
Pickup threshold
(warning stage)
1.00 to 1.20 increments 0.01
Pickup threshold
(stepped characteristic)
1.00 to 1.40 increments 0.01
Time delay (warning stage
and stepped charact.)
T U/f>, T U/f>> 0.00 to 60.00 s
or ∞ (ineffective)
increments 0.01 s
Pair of values for character-
istic of
U/f 1.05/1.10/1.15/1.20/1.25/1.30/1.35/1.40
Associated time delays for
thermal characteristic
t (U/f) 1 s to 20000 s increments 1 s
Time for cool down T
COOL DOWN
1 s to 20000 s increments 1 s
Times
Pickup/dropout times of warning stage and stepped characteristic
Pickup time at frequency 50 Hz 60 Hz 16.7 Hz (only
7UT613/63x)
Minimum 36 ms 31 ms 91 ms
Dropout time, approx. 36 ms 23 ms 70 ms
Dropout-to-Pickup Ratio
Dropout/Pickup
approx.. 0.98
Tripping Time Characteristic
Thermal replica and stepped characteristic
For default settings see Figure 4-19
Tolerances
U/f pickup
3 % of setting value
Time delay (warning stage and stepped
charact.)
1 % of setting value, bzw. 10 ms (mind. 1.5
Perioden)
Thermal replica 5 %, related toU/f ± 600 ms
Influencing Variables
Power supply direct voltage in range 0.8 ≤
U
H
/U
HN
≤ 1.15
≤ 1 %
Temperature in range –5 °C ≤ δ
amb
≤ 55 °C ≤ 0.5 %/10 K
Frequency in range 0.95 ≤ f/f
N
≤ 1.05 ≤ 1 %
Harmonic currents
up to 10 % 3rd harmonic
up to 10 % 5th harmonic
≤ 1 %
≤ 1 %
4.11
Technical Data
4.11 Overexcitation Protection
444 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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