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

7SR21 & 7SR22 Performance Specification

2.10 50 Instantaneous Overcurrent

2.10.1 Reference

Parameter
Is Setting
i Applied Current (for operate time)
t Delay setting
d

2.10.2 Operate and Reset Level

Attribute
I Operate level
op
Reset level
Repeatability
Transient overreach
(X/R £ 100)
Variation

2.10.3 Operate and Reset Time

Attribute
t Element basic operate time
basic
t Operate time following delay
op
Repeatability
Overshoot time
Disengaging time
Unrestricted Page 32 of 68
-10 °C to +55 °C
+ 2 Hz £ 5 %
f - 3 Hz to f
nom nom
Value
0.05, 0.06... 25, 25.5... 50 xIn
Current switched from below Is to 2x Is
Current switched from below Is to 5x Is
0.00, 0.01...20.00, 20.50... 100, 101... 1000, 1010...
10000, 10100... 14400 s
Value
100 % Is, ± 5 % or ± 1% In
³ 95 % I
op
± 1 %
£ -5 %
£ 5 %
Value
Switched from 0 to 2x Is: 40 ms, ± 10 ms
Switched from 0 to 5x Is: 30 ms, ± 10 ms
, ± 1 % or ± 10 ms
t + t
basic d
± 1 % or ± 10 ms
< 40 ms
< 50 ms
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