7SR11 & 7SR12 Performance Specification
ยฉ2017 Siemens Protection Devices Limited Chapter 3 Page 23 of 56
2.5.6 Operate and Reset Time (46IT)
Attribute Value
Starter operate time (โฅ 2xIs)
35 ms, ยฑ 10ms
t
op
Operate time
char = IEC-NI,
IEC-VI,
IEC-EI,
IEC-LTI
, ยฑ 5 % absolute or ยฑ 50 ms,
for char = IEC-NI : K = 0.14, ฮฑ = 0.02
IEC-VI : K = 13.5, ฮฑ = 1.0
IEC-EI : K = 80.0, ฮฑ = 2.0
IEC-LTI : K = 120.0, ฮฑ = 1.0
char = ANSI-MI,
ANSI-VI,
ANSI-EI
[ ]
TmB
A
t
P
Is
I
op
ร
๏ฃบ
๏ฃบ
๏ฃป
๏ฃน
๏ฃฏ
๏ฃฏ
๏ฃฐ
๏ฃฎ
+
โ
=
1
, ยฑ 5 % absolute or ยฑ 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
, ยฑ 1 % or ยฑ 20ms
Reset time
ANSI DECAYING
, ยฑ 5 % absolute or ยฑ 50 ms,
for char = ANSI-MI : R = 4.85
ANSI-VI : R = 21.6
ANSI-EI : R = 29.1
IEC DECAYING
, ยฑ 5 % absolute or ยฑ 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
, ยฑ 1 % or ยฑ 20ms
Repeatability
ยฑ 1 % or ยฑ 20ms
Overshoot time < 40 ms
Disengaging time < 60 ms
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