Siemens 7SR224 - 51 SEF Time Delayed Sensitive Earth Fault; Reference; Operate and Reset Level

7SR224 Argus Performance Specification
2.11 51SEF Time Delayed Sensitive Earth Fault
2.11.1 Reference
Parameter Value
Is
Setting 0.005, 0.006 …0.100, 0.105… 1.0 xIn
char
Characteristic setting
IEC-NI, -VI, -EI, -LTI;
ANSI-MI, -VI, -EI; DTL
Manufacturer specific curves
See ‘Performance Specification Appendix 1’
Tm
Time multiplier 1.0
t
d
Delay setting 0.00…20.00 s
t
res
Reset setting DECAYING, 0, 1…60 s
IDMTL 2 to 20 xIs
I
Applied current (for
operate time)
DTL 5 xIs
2.11.2 Operate and Reset Level
Attribute Value
I
op
Operate level
105 % Is, ± 4 % or ± 1% In
Reset level
≥ 95 % I
op
± 4 % or ± 1% In
Repeatability
± 1 %
-10 °C to +55 °C
≤ 5 %
Variation
f
nom
- 3 Hz
to f
nom
+ 2 Hz
harmonics to f
cutoff
≤ 5 %
©2010 Siemens Protection Devices Limited Chapter 3 Page 33 of 49