Line And Bus Undervoltage Elements; Voltage Difference; General Autoreclose Timers; Cs/Ss/Coz Line And Bus Phase Angle Difference - Siemens Argus 7SR21 Technical Manual

4.1.3

Line and Bus Undervoltage Elements

Attribute
V Operate level
line
Reset level
V Operate level
bus
Reset level
Repeatability
Variation
4.1.4

Voltage Difference

Attribute
V Operate level
op
Reset level
Repeatability
4.1.5

General Autoreclose Timers

Attribute
t Element basic operate time
basic
t t /t /t
op dlc dbc cw
Repeatability
4.1.6

CS/SS/COZ Line and Bus Phase Angle Difference

Attribute
q
Operate angle
op
Reset angle
Repeatability
4.1.7

CS/SS/COZ Slip Frequency

Attribute
f Operate frequency
op
Reset frequency
Repeatability
4.1.8

CS/SS Timer

Attribute
t Operate time
op
Note: minimum synchronising time following restoration of voltage from a dead condition is 320 ms.
Unrestricted © 2013 Siemens Protection Devices Limited
Value
100 % Vsl, ± 1 % V
£ V
100 % Vsb, ± 1 % V
£ V
± 1 %
-10 °C to +55 °C £ 5 %
f ± 5 % £ 1 %
nom
Value
100 % V
³ V
± 2 %
Value
20 ms ± 20 ms
t
op
± 20 ms
Value
q
diff
q
op
± 1 º
Value
f
slip
f
op
± 10 mHz
Value
± 1 º, + 20 ms
7SR21 & 7SR22 Performance Specification
n
+ 4 %
line
n
+ 4 %
bus
, ± 1 % V
diff
n
– 4 %
op
+ t ± 1%
basic
, ± 1 º
, ± 1 º
, ± 10 mHz
, - 10 mHz
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