Siemens Argus 7SR21 - 67;67 N Directional Overcurrent & Earth Fault; Operate and Reset Time; Operate Angle; Operate Threshold

7SR21 & 7SR22 Performance Specification
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2.22 67/67N Directional Overcurrent & Earth Fault
2.22.1 Reference
Parameter Value
u
s
Angle setting
-95…+95 °
I Applied current In
V Applied voltage 110 V phase-phase (63.5 V phase-earth)
2.22.2 Operate Angle
Attribute Value
CA
Characteristic angle (I with respect
to V)
u
s
, ± 5 °
Operating angle
forward
CA - 85 ° ± 5 ° to CA + 85° ± 5 °
reverse
(CA - 180°) - 85° ± 5 ° to (CA - 180°) + 85° ± 5 °
Variation in
characteristic
angle
10°C to +55°C
± 5 °
f
nom
- 3 Hz to f
nom
+ 2 Hz
± 5 °
2.22.3 Operate Threshold
Attribute
Value
Minimum levels for
operation
I (p/f)
> 5 % In
I (e/f) > 10 % In
V (p/f)
> 1 V
V (e/f)
> 1 V
2.22.4 Operate and Reset Time
Attribute Value
Operate time typically 25 < 40 ms at characteristic angle
Reset time typically < 65 ms at characteristic angle