Siemens SIPROTEC 7UM62 - Page 468

Technical Data
4.3 Inverse-Time Overcurrent Protection (ANSI 51V)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
468
Trip Time Characteristics according to ANSI
Tolerances
Influencing Variables
As per ANSI/IEEE (see also Figures 4-2 and 4-3)
The tripping times for I/I
p
≥ 20 are identical with those for I/I
p
= 20.
Pickup Threshold approx. 1.10 · I
p
Dropout Threshold approx. 1.05 · I
p
for I
p
/I
N
≥ 0.3,
this corresponds to approx. 0,95 · pickup value
Pickup and dropout
thresholds I
p
for I
N
= 1 A 1 % of setting value or 10 mA
for I
N
= 5 A 1 % of setting value or 50 mA
Pickup of U< 1 % of setting value or 0.5 V
Time for 2 ≤ I/I
p
≤ 20 5 % of reference (calculated) value +1 % current tolerance, or 40 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 1 %