Siemens Argus 7SR21 - 81 HBL2 Inrush Detector; Operate and Reset Level; Operate and Reset Time; Reference

7SR21 & 7SR22 Performance Specification
Unrestricted Page 62 of 68 © 2013 Siemens Protection Devices Limited
3.6 81HBL2 Inrush Detector
3.6.1 Reference
Parameter Value
I
Setting
(Ratio of 2nd Harmonic current to
Fundamental component current)
0.10, 0.11... 0.5
3.6.2 Operate and Reset Level
Attribute Value
I
op
Operate level
100 % I, ± 4 % or ± 1 % In
Reset level
100 % I
op
, ± 4 % or ± 1 % In
Repeatability
± 1 %
Variation
- 10 °C to + 55 °C
£ 5 %
f
nom
- 3 Hz to f
nom
+ 2 Hz
£ 5 %
3.6.3 Operate and Reset Time
Attribute Value
t
basic
Element basic operate time
Will pick-up before operation of any protection element due
to magnetic inrush
Reset Time
Will operation until drop-off of any protection element due
to magnetic inrush