Siemens Argus 7SR21 - 60 CTS & CTS-I Current Transformer Supervision; Current & Voltage Threshold; Operate and Reset Time; Reference

7SR21 & 7SR22 Performance Specification
Unrestricted Page 58 of 68 © 2013 Siemens Protection Devices Limited
3.3 60CTS & CTS-I Current Transformer Supervision
3.3.1 Reference
Parameter Value
I
thresh
Current Threshold 0.05, 0.1… 1 xIn
V
thresh
Voltage Threshold 7, 8… 110V
t
d
Delay setting
0.03, 0.04…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
CTS-I
I
thresh
Current Threshold 0.05, 0.1… 2 xIn
3.3.2 Current & Voltage Threshold
Attribute Value
I
op
CT failed current level
100 % I
thresh
, ± 5% or ± 1% In
Reset level
90 % I
op,
± 5% or ± 1% In
V
op
CT failed voltage level
100 % V
thresh
, ± 2% or ± 0.5 V
Reset level
110 % V
op
, ± 2 % or ± 0.5 V
Repeatability
± 1 %
Variation
-10 °C to +55 °C
£ 5 %
f
nom
- 3 Hz to f
nom
+ 2 Hz
harmonics to f
cutoff
£ 5 %
3.3.3 Operate and Reset Time
Attribute Value
t
basic
Basic operate time
30 ms ± 20ms
Operate time
t
basic
, ± 1 % or ± 20ms
Repeatability
± 1 % or ± 20ms