7SR21 & 7SR22 Performance Specification
Unrestricted © 2013 Siemens Protection Devices Limited Page 47 of 68
2.18 51V Voltage Controlled Overcurrent (Ph-Ph)
2.18.1 Reference
Parameter Value
Vs Setting 5, 5.5…199.5, 200 V
m Multiplier 0.25, 0.3…0.95, 1
Is Setting 1 xIn
2.18.2 Operate and Reset Level
Attribute Value
V
op
Operate level
100 % Vs, ± 1 % or ± 0.25 V
Reset level
£ 105 % V
op
Repeatability
± 1 %
Variation
-10 °C to +55 °C
£ 5 %
f
nom
- 3 Hz
to f
nom
+ 2 Hz
harmonics to f
cutoff
£ 5 %
Operate and Reset Time
As per Phase Fault Shaped Characteristic Element (ANSI 51).
Where Pickup Level = Is for Voltage > Vs
Pickup Level = (Is x m) for Voltage < Vs
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