Undercurrent; Reference; Operate And Reset Level; Operate And Reset Time - Siemens Argus 7SR21 Technical Manual

2.5

37 Undercurrent

2.5.1

Reference

Parameter
Is Setting
t Delay setting
d
Is 37-n U/I Guard Setting
2.5.2

Operate and Reset Level

Attribute
I Operate level
op
Reset level
Repeatability
Variation
2.5.3

Operate and Reset Time

Attribute
t Element basic operate time
basic
t Operate time following delay
op
Repeatability
Overshoot time
Disengaging time
Unrestricted © 2013 Siemens Protection Devices Limited
-10 °C to +55 °C
+ 2 Hz £ 5 %
f - 3 Hz to f
nom nom
7SR21 & 7SR22 Performance Specification
Value
0.05, 0.10...5.0 xIn
0.00, 0.01...20.00, 20.50... 100, 101... 1000, 1010...
10000, 10100... 14400 s
0.05, 0.10...5.0 xIn
Value
100 % Is, ± 5 % or ± 1% In
£ 105 % I
op
± 1 %
£ 5 %
Value
1.1 to 0.5 xIs: 35 ms, ± 10ms
, ± 1 % or ± 10ms
t + t
basic d
± 1 % or ± 10ms
< 40 ms
< 60 ms
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