Siemens Argus 7SR21 - Operate and Reset Level; Time Delayed Derived Earth Fault; Reference

7SR21 & 7SR22 Performance Specification
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2.16 51N Time Delayed Derived Earth Fault
2.16.1 Reference
Parameter Value
Is Setting 0.05, 0.06… 2.5 xIn
char Characteristic setting
IEC-NI, -VI, -EI, -LTI;
ANSI-MI, -VI, -EI; DTL
Tm Time Multiplier setting 0.025, 0.05… 1.6
t
d
Delay setting 0, 0.01… 20 s
t
res
Reset setting ANSI DECAYING, 0, 1… 60 s
2.16.2 Operate and Reset Level
Attribute Value
I
op
Operate level
105 % Is, ± 4 % or ± 1% In
Reset level
³ 95 % I
op
Repeatability
± 1 %
Variation
- 10 °C to + 55 °C
£ 5 %
f
nom
- 3 Hz to f
nom
+ 2 Hz
£ 5 %