Siemens Argus 7SR22 - Undercurrent; Operate and Reset Level; Operate and Reset Time; Reference

7SR21 & 7SR22 Performance Specification
Unrestricted © 2013 Siemens Protection Devices Limited Page 25 of 68
2.5 37 Undercurrent
2.5.1 Reference
Parameter Value
Is Setting 0.05, 0.10…5.0 xIn
t
d
Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
Is 37-n U/I Guard Setting 0.05, 0.10…5.0 xIn
2.5.2 Operate and Reset Level
Attribute Value
I
op
Operate level
100 % Is, ± 5 % or ± 1% In
Reset level
£ 105 % I
op
Repeatability
± 1 %
Variation
-10 °C to +55 °C
£ 5 %
f
nom
- 3 Hz to f
nom
+ 2 Hz
£ 5 %
2.5.3 Operate and Reset Time
Attribute Value
t
basic
Element basic operate time
1.1 to 0.5 xIs: 35 ms, ± 10ms
t
op
Operate time following delay
t
basic
+ t
d
, ± 1 % or ± 10ms
Repeatability
± 1 % or ± 10ms
Overshoot time < 40 ms
Disengaging time < 60 ms