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Trip Time Curves acc. to ANSI
Tolerances
Influencing Variables
7UM61 Manual
C53000-G1176-C127-3
As per ANSI/IEEE (see also Figures 4-2 and 4-3)
≥ 20 are identical to those for I/I
The trip times for I/I
p
Pickup Threshold
Dropout Threshold
Pickup and Dropout
for I
Thresholds I
for I
p
Pickup Threshold U<
Time for 2 ≤ I/I
≤ 20
p
Auxiliary DC voltage in range
0.8 ≤ U
≤ 1.15
/U
Aux
AuxN
4.3 Inverse-Time Overcurrent Protection (ANSI 51V)
= 20.
p
approx. 1.10 · I
p
Approx. 1.05 · I
p
this corresponds to approx. 0,95 · pickup value
= 1 A
1 % of setting value or 10 mA
N
= 5A
5 % of setting value or 50 mA
N
1 % of setting value or 0.5 V
5 % of reference (calculated) value +1 % current tol-
erance, respectively 40 ms
≤ 1 %
≥ 0.3
for I
/I
p
N
311
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