Siemens 7SR12 Argus Manual page 144

7SR11 & 7SR12 Performance Specification
Attribute
Repeatability
Overshoot time
Disengaging time
Figure 2.12-1and Figure 2.12-4 show the operate and reset curves for the four IEC IDMTL curves with a time
multiplier of 1.
Figure 2.12-2 and Figure 2.12-3 show the ANSI operate and reset curves. These operate times apply to non-
directional characteristics. Where directional control is applied then the directional element operate time should be
added to give total maximum operating time.
©2017 Siemens Protection Devices Limited
IEC DECAYING
t
res
Value
R
= ×
, ± 5 % absolute or ± 50 ms,
t Tm
[ ]
res −
2
I
1
Is
for char = IEC-NI : R = 9.7
IEC-VI : R = 43.2
IEC-EI : R = 58.2
IEC-LTI : R = 80
, ± 1 % or ± 20ms
t
res
± 1 % or ± 20ms
< 40 ms
< 50 ms
Chapter 3 Page 32 of 56