Siemens Argus 7SR21 - Restricted Earth Fault Protection; Operate and Reset Level; Operate and Reset Time; Reference

7SR21 & 7SR22 Performance Specification
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2.21 64H Restricted Earth Fault Protection
2.21.1 Reference
Parameter Value
Is Setting 0.005, 0.006… 0.95 xIn
t
d
Delay setting
0.00, 0.01… 20.0, 20.1… 100.0, 101.…1000, 1010 …
10000 , 10100 … 14400 s
2.21.2 Operate and Reset Level
Attribute Value
I
op
Operate level
100 % Is, ± 5 % or ±1 % xIn
Reset level
95 % I
op
, ± 5 % or ±0.1 % xIn
Repeatability
± 1 %
Transient overreach
(X/R £ 100)
£ -5 %
Variation
-10 °C to +55 °C
£ 5 %
f
nom
- 3 Hz to f
nom
+ 2 Hz
£ 5 %
2.21.3 Operate and Reset Time
Attribute Value
t
basic
Element basic operate time
t
op
Operate time following delay
t
basic
+ t
d
, ± 1% or ± 10 ms
Repeatability
± 1% or ± 10 ms
Overshoot time < 40 ms
Disengaging time < 50 ms