Siemens 7SR51 - Directional Earth Fault - Calculated

67N Directional Earth Fault – Calculated
Reference
Parameter Value
Polarizing quantity V2, V0
θ
set
Characteristic angle setting -95° to +95°
Vmins
et
Minimum voltage setting 0.33 to 3 V, Δ 0.5 V
I Applied current (for operate time) 0.1 ⋅ I
rated
1 ⋅ I
rated
V Applied voltage 0.1 ⋅ V
rated
1 ⋅ V
rated
Operate Angle
Attribute Value
θ
op
Characteristic angle (I with respect to V) θ
set
, ± 5°
Operating angle Forward θ
set
- 85° ± 5° to θ
set
+ 85° ± 5°
Reverse (θ
set
- 180°) - 85° ± 5° to (θ
set
- 180°) + 85 ° ± 5°
Variation in charac-
teristic angle
-10 °C to +55 °C ± 5 °
f
rated
± 5 % ± 5 °
Operate Threshold
Attribute
Value
Minimum operating voltage > 0.33 V
Operate and Reset Time
Attribute
Value
t
op
Operate time Typically 32 ms
< 40 ms at characteristic angle + 50/51 element operate time
t
reset
Reset time Typically < 65 ms at characteristic angle
10.32
Technical Data
10.32 67N Directional Earth Fault – Calculated
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 547
C53000-G7040-C014-1, Edition 11.2019