Underfrequency Element; Dtl Timing Elements; Accuracy General; Accuracy Influencing Factors - Siemens 7SG11 Technical Manual

6.6 Underfrequency Element

Underfrequency Element
Operate Level
Reset Level
Operate Time
For ROCOF between 0.1-10 Hz/sec

6.7 DTL Timing Elements

All Timers
Timing Accuracy

7 Accuracy General

Measuring Accuracy (50 or 60 Hz)
Phase Voltage
Vo (Measured)
Vo (Calculated)
V2 (NPS)
Frequency

8 Accuracy Influencing Factors

Temperature
Ambient Range
Variation over range
Frequency
Range
Setting variation
Operating time variation
Auxiliary DC Supply - IEC 60255-11
Allowable superimposed ac component
Allowable breaks/dips in supply (collapse to zero from
nominal voltage)

9 Thermal Withstand

Continuous Overload
AC Voltage
10

Burdens

AC Burden
110Vrms Input
63.5Vrms Input
DC Burden
Quiescent (Typical)
Max
©2011 Siemens Protection Devices Limited
7SG11 Argus 8 Performance Specification
Setting ± 10mHz
Operate + 20mHz
Typically < 140ms
Maximum < 175ms
Typically < 100ms : AG8 - 300 series only
Maximum < 150ms
±1% or 30ms
± 1% or 0.25V
± 1% or 0.5V
± 1% or 0.5V
± 1% or 0.5V
< ± 10mHz
-10°C to +55°C
≤
5%
47Hz to 52Hz
57Hz to 62Hz
≤
1%
≤
1%
≤ 12% of DC voltage
≤ 20ms
250Vrms ( 353Vpk)
AC Burden
≤ 0.1VA
≤ 0.05VA
DC Burden
3 Watts
10 Watts
Chapter 2 Page 6 of 9