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

2.16 51N Time Delayed Derived Earth Fault

2.16.1 Reference

Parameter
Is Setting
char Characteristic setting
Tm Time Multiplier setting
t Delay setting
d
t Reset setting
res

2.16.2 Operate and Reset Level

Attribute
I Operate level
op
Reset level
Repeatability
Variation
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, 0.06... 2.5 xIn
IEC-NI, -VI, -EI, -LTI;
ANSI-MI, -VI, -EI; DTL
0.025, 0.05... 1.6
0, 0.01... 20 s
ANSI DECAYING, 0, 1... 60 s
Value
105 % Is, ± 4 % or ± 1% In
³ 95 % I
op
± 1 %
£ 5 %
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