67/67N Directional Overcurrent & Earth Fault; Reference; Operate Angle; Operate Threshold - Siemens 7SR12 Argus Manual

2.21 67/67N Directional Overcurrent & Earth Fault

Reference

2.21.1
Parameter
θ
Angle setting
s
I Applied current
V Applied voltage

Operate Angle

2.21.2
Attribute
Characteristic angle (I with respect
CA
to V)
Operating angle
Variation in
characteristic
angle

Operate Threshold

2.21.3
Attribute
Minimum levels for
operation

Operate and Reset Time

2.21.4
Attribute
Operate time
Reset time
©2017 Siemens Protection Devices Limited
forward
reverse
10°C to +55°C
f ± 5 %
nom
I (p/f)
I (e/f)
V (p/f)
V (e/f)
7SR11 & 7SR12 Performance Specification
Value
-95...+95 °
In
110 V phase-phase (63.5 V phase-earth)
Value
θ , ± 5 °
s
CA - 85 ° ± 5 ° to CA + 85° ± 5 °
(CA - 180°) - 85° ± 5 ° to (CA - 180°) + 85° ± 5 °
± 5 °
± 5 °
Value
> 5 % In
> 10 % In
> 1 V
> 1 V
Value
typically 32, < 40 ms at characteristic angle
+ 50/51 element operate time
typically < 65 ms at characteristic angle
Chapter 3 Page 49 of 56