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

2.21 64H Restricted Earth Fault Protection

2.21.1 Reference

Parameter
Is Setting
t Delay setting
d

2.21.2 Operate and Reset Level

Attribute
I Operate level
op
Reset level
Repeatability
Transient overreach
(X/R £ 100)
Variation

2.21.3 Operate and Reset Time

Attribute
t Element basic operate time
basic
t Operate time following delay
op
Repeatability
Overshoot time
Disengaging time
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
0.005, 0.006... 0.95 xIn
0.00, 0.01... 20.0, 20.1... 100.0, 101....1000, 1010 ...
10000 , 10100 ... 14400 s
Value
100 % Is, ± 5 % or ±1 % xIn
, ± 5 % or ±0.1 % xIn
95 % I
op
± 1 %
£ -5 %
£ 5 %
Value
, ± 1% or ± 10 ms
t + t
basic d
± 1% or ± 10 ms
< 40 ms
< 50 ms
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