Table 6-18 Ieee Curve Data Table; Figure 6-17 Ieee Pickup Curve Equation; Figure 6-18 Ieee Reset Curve Equation - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

IEEE Curve
The pickup time as a function of current is given by:
Figure 6-17
The reset time is either zero (selectable) or given by:
T
do
Figure 6-18
Table 6-18 IEEE Curve Data Table
IEEE Curve
Extremely Inverse
Very Inverse
Moderately Inverse
Each graphic below depicts the IEEE Curve for each curve type using the data given in the
IEEE Curve Data Table.
Advanced Motor Protection for Variable Speed Operation
Manual, AA, A5E46373908A
IEEE Pickup Curve Equation

τ
−
TDM
 reset

( )
I pu
1 −

I rms
IEEE Reset Curve Equation
A B
28.2 0.1217
19.61 0.491
0.0515 0.1140
Advanced Motor Protection and RTD Protection Functions
6.18 Device 51 - Fixed Inverse Time Overcurrent


2


p
2.000
2.000
0.02000
τ
reset
29.1
21.6
4.85
87