Siemens Argus 7SR21 - Line and Bus Undervoltage Elements; Voltage Difference; General Autoreclose Timers; CS;SS;COZ Line and Bus Phase Angle Difference

7SR21 & 7SR22 Performance Specification
Unrestricted © 2013 Siemens Protection Devices Limited Page 67 of 68
4.1.3 Line and Bus Undervoltage Elements
Attribute Value
V
line
Operate level
100 % Vsl, ± 1 % V
n
Reset level
£ V
line
+ 4 %
V
bus
Operate level
100 % Vsb, ± 1 % V
n
Reset level
£ V
bus
+ 4 %
Repeatability
± 1 %
Variation
-10 °C to +55 °C
£ 5 %
f
nom
± 5 %
£ 1 %
4.1.4 Voltage Difference
Attribute Value
V
op
Operate level
100 % V
diff
, ± 1 % V
n
Reset level
³ V
op
– 4 %
Repeatability
± 2 %
4.1.5 General Autoreclose Timers
Attribute Value
t
basic
Element basic operate time 20 ms ± 20 ms
t
op
t
dlc
/t
dbc
/t
cw
t
op
+ t
basic
± 1%
Repeatability ± 20 ms
4.1.6 CS/SS/COZ Line and Bus Phase Angle Difference
Attribute Value
q
op
Operate angle
q
diff
, ± 1 º
Reset angle
q
op
, ± 1 º
Repeatability
± 1 º
4.1.7 CS/SS/COZ Slip Frequency
Attribute Value
f
op
Operate frequency f
slip
, ± 10 mHz
Reset frequency f
op
, - 10 mHz
Repeatability
± 10 mHz
4.1.8 CS/SS Timer
Attribute Value
t
op
Operate time ± 1 º, + 20 ms
Note: minimum synchronising time following restoration of voltage from a dead condition is 320 ms.