Technical Data
4.6 Startup Overcurrent Protection (ANSI 51)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
475
4.6 Startup Overcurrent Protection (ANSI 51)
Setting Ranges / Increments
Times
Dropout Conditions
Tolerances
Influencing Variables for Pickup Values
Pickup current I>for I
N
= 1 A 0.10 A to 20.00 A Increments 0.01 A
for I
N
= 5 A 0.50 A to 100.00 A Increments 0.01 A
Delay times T 0.00 s to 60.00 s
or ineffective
Increments 0.01 s
Pickup Times I> 120 ms or higher (dep. on signal frequency)
Dropout times I> 120 ms or higher (dep. on signal frequency)
Current threshold I> 80 % or 0.05 I/In
Current threshold I>
f ≥ 3 Hz, I/I
N
< 5
≤ 10 %
Delay times T 1 % or 10 ms
Power supply direct voltage in range 0.8 ≤ U
Aux
/U
AuxN
≤ 1.15 ≤ 1 %
Temperature in range 23.00 °F (–5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) ≤ 0.5 % / 10 K
Frequency in range 0.95 ≤ f/f
N
≤ 1.05 ≤ 10 %
Harmonics
- Up to 10 % 3rd harmonic
- Up to 10 % 5th harmonic
≤ 100 % (considered in calculation)
≤ 100 % (considered in calculation)
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