51Sef Time Delayed Sensitive Earth Fault; Reference; Operate And Reset Level - Siemens 7SR224 Technical Manual

2.11 51SEF Time Delayed Sensitive Earth Fault

2.11.1 Reference

Parameter
Setting
Is
char Characteristic setting
Tm Time multiplier
t Delay setting
d
t Reset setting
res
Applied current (for
I
operate time)

2.11.2 Operate and Reset Level

Attribute
I Operate level
op
Reset level
Repeatability
-10 °C to +55 °C
f
nom
Variation
harmonics to f
©2010 Siemens Protection Devices Limited
Value
0.005, 0.006 ...0.100, 0.105... 1.0 xIn
IEC-NI, -VI, -EI, -LTI;
ANSI-MI, -VI, -EI; DTL
Manufacturer specific curves
See 'Performance Specification Appendix 1'
1.0
0.00...20.00 s
DECAYING, 0, 1...60 s
IDMTL 2 to 20 xIs
DTL 5 xIs
Value
105 % Is, ± 4 % or ± 1% In
≥ 95 % I
op
± 1 %
≤ 5 %
- 3 Hz
to f + 2 Hz
nom
≤ 5 %
cutoff
7SR224 Argus Performance Specification
± 4 % or ± 1% In
Chapter 3 Page 33 of 49