Siemens 7SR12 Argus - Operate and Reset Time (46 IT)

7SR11 & 7SR12 Performance Specification
©2017 Siemens Protection Devices Limited Chapter 3 Page 23 of 56
2.5.6 Operate and Reset Time (46IT)
Attribute Value
Starter operate time (≥ 2xIs)
35 ms, ± 10ms
t
op
Operate time
char = IEC-NI,
IEC-VI,
IEC-EI,
IEC-LTI
[ ]
Tm
K
t
Is
I
op
×
−
=
1
α
, ± 5 % absolute or ± 50 ms,
for char = IEC-NI : K = 0.14, α = 0.02
IEC-VI : K = 13.5, α = 1.0
IEC-EI : K = 80.0, α = 2.0
IEC-LTI : K = 120.0, α = 1.0
char = ANSI-MI,
ANSI-VI,
ANSI-EI
[ ]
TmB
A
t
P
Is
I
op
×








+
−
=
1
, ± 5 % absolute or ± 50 ms,
(ANSI-EI +5% -10 % absolute for I/Is>10 with TMS >2)
for char = ANSI-MI : A = 0.0515, B = 0.114, P = 0.02
ANSI-VI : A = 19.61, B = 0.491, P = 2.0
ANSI-EI : A = 28.2, B = 0.1217, P = 2.0
char = DTL
t
d
, ± 1 % or ± 20ms
Reset time
ANSI DECAYING
[ ]
Tm
R
t
Is
I
res
×
−
=
1
2
, ± 5 % absolute or ± 50 ms,
for char = ANSI-MI : R = 4.85
ANSI-VI : R = 21.6
ANSI-EI : R = 29.1
IEC DECAYING
[ ]
Tm
R
t
Is
I
res
×
−
=
1
2
, ± 5 % absolute or ± 50 ms,
for char = IEC-NI : R = 9.7
IEC-VI : R = 43.2
IEC-EI : R = 58.2
IEC-LTI : R = 80
t
res
t
res
, ± 1 % or ± 20ms
Repeatability
± 1 % or ± 20ms
Overshoot time < 40 ms
Disengaging time < 60 ms