7SG11 Argus 8 Performance Specification
6.6 Underfrequency Element
Underfrequency Element
Operate Level
Setting ± 10mHz
Reset Level
O 20mHz
Operate Time
Typically < 140ms
Maximum < 175ms
For ROCOF between 0.1-10 Hz/sec
Typically < 100ms : AG8 - 300 series only
Maximum < 150ms
6.7 DTL Timing Elements
All Timers
Timing Accuracy
±1% or 30ms
7 Accuracy General
Measuring Accuracy (50 or 60 Hz)
Phase Voltage
± 1% or 0.25V
Vo (Measured)
± 1% or 0.5V
Vo (Calculated)
± 1% or 0.5V
V2 (NPS)
± 1% or 0.5V
Frequency
< ± 10mHz
8 Accuracy Influencing Factors
Temperature
Ambient Range
-10°C to +55°C
Variation over range
≤
5%
Frequency
Range
47Hz to 52Hz
57Hz to 62Hz
Setting variation
≤
1%
Operating time variation
≤
1%
Auxiliary DC Supply - IEC 60255-11
Allowable superimposed ac component
≤
12% of DC voltage
Allowable breaks/dips in supply (collapse to zero from
nominal voltage)
≤
20ms
9 Thermal Withstand
Continuous Overload
AC Voltage
250Vrms ( 353Vpk)
10 Burdens
AC Burden
AC
Burden
110Vrms Input
≤
0.1VA
63.5Vrms Input
≤
0.05VA
DC Burden
DC
Burden
Quiescent (Typical)
3 Watts
Max 10
Watts
©2010 Siemens Protection Devices Limited
Chapter 2 Page 6 of 9