Siemens 7SR12 Argus Manual page 154

7SR11 & 7SR12 Performance Specification
Attribute
Reset time
Repeatability
Overshoot time
Disengaging time
Variation
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
Value
, ± 1 % or ± t
char = DTL t
d
t
res
char = ANSI and
t = DECAYING
res
for char = ANSI-MI : R = 4.85
t
res
IEC DECAYING
for char =
≠ DECAYING
t t
res res
± 1 % or ± 20ms
< 40 ms
< 50 ms
f ± 5 %
nom
≤ 5 %
harmonics to f
cutoff
cycle
R
= ×
, ± 5 % absolute or ± 30 ms,
Tm
[ ]
−
2
I
1
Is
ANSI-VI : R = 21.6
ANSI-EI : R = 29.1
R
= ×
, ± 5 % absolute or ± 50 ms,
Tm
[ ]
−
2
I
1
Is
IEC-NI : R = 9.7
IEC-VI : R = 43.2
IEC-EI : R = 58.2
IEC-LTI : R = 80
, ± 1 % or ± 20ms
Chapter 3 Page 42 of 56