Operate And Reset Level; Operate And Reset Time; Instantaneous Derived Earth Fault; Reference - Siemens Argus 7SR21 Technical Manual

7SR21 & 7SR22 Performance Specification
2.12 50N Instantaneous Derived Earth Fault

2.12.1 Reference

Parameter
Is Setting
t Delay setting
d

2.12.2 Operate and Reset Level

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

2.12.3 Operate and Reset Time

Attribute
t Element basic operate time
basic
t Operate time following delay
op
Repeatability
Overshoot time
Disengaging time
Unrestricted Page 34 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
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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