7SR21 & 7SR22 Performance Specification
Unrestricted Page 32 of 68
© 2013 Siemens Protection Devices Limited
2.10 50 Instantaneous Overcurrent
2.10.1 Reference
Parameter
Value
Is
Setting
0.05, 0.06… 25, 25.5… 50 x
In
i
Applied Current (for operate time)
Current switched from below
Is
to 2x
Is
Current switched from below
Is
to 5x
Is
t
d
Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
2.10.2 Operate and Reset Level
Attribute
Value
I
op
Operate level
100 %
Is
,
±
5 % or
±
1%
In
Reset level
³
95 %
I
op
Repeatability
±
1 %
Transient overreach
(X/R
£
100)
£
-5 %
Variation
-10 °C to +55 °C
£
5 %
f
nom
- 3 Hz to
f
nom
+ 2 Hz
£
5 %
2.10.3 Operate and Reset Time
Attribute
Value
t
basic
Element basic operate time
Switched from 0 to 2x
Is
: 40 ms,
±
10 ms
Switched from 0 to 5x
Is
: 30 ms,
±
10 ms
t
op
Operate time following delay
t
basic
+
t
d
,
±
1 % or
±
10 ms
Repeatability
±
1 % or
±
10 ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
Содержание Argus 7SR21
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