Siemens 7SR224 - Restricted Earth Fault Protection; Reference; Operate and Reset Level; Operate and Reset Time

7SR224 Argus Performance Specification
2.14 64H Restricted Earth Fault Protection
2.14.1 Reference
Parameter Value
Is
Setting 0.005, 0.006 ..0.100, 0.105… 0.95 xIn
t
d
Delay setting
0.00, 0.01… 20.0, 20.1… 100.0, 101.…1000, 1010 …
10000 , 10100 … 14400 s
2.14.2 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 %
-10 °C to +55 °C
≤ 5 %
Variation
f
nom
- 3 Hz to f
nom
+ 2 Hz
≤ 5 %
2.14.3 Operate and Reset Time
Attribute Value
0 to 2 xIs, 40 ms, ± 10ms
t
basic
Element basic operate time
0 to 5 xIs, 30 ms, ± 10ms
t
op
Operate time following delay
t
basic
+ t
d
, ± 1% or ± 10ms
Repeatability
± 1% or ± 10ms
Overshoot time < 40 ms
Disengaging time < 50 ms
©2010 Siemens Protection Devices Limited Chapter 3 Page 38 of 49