Settings Menu; Iec 61850 Functional Information Mapping - Siemens 7SR51 Device Manual

Alternatively, to improve stability, an 81 element can be used as a starter for the 81R elements. In this case the
81R elements could be inhibited until the frequency varies by an abnormal amount; as indicated by the
picking-up of the 81 element.
Where a high rate of frequency change has been detected, indicating a large generated power to load imbal-
ance, it may be preferable to shed 2 or more load groups at the same time without waiting for the relative
underfrequency levels to be reached.

Settings Menu

5.28.5
Functions > Function Config
Parameter
81R Frequency RoCof
Functions > Protection > 81R > Gn 81R-n
Parameter
Element
Setting
Direction
Delay (DTL)

IEC 61850 Functional Information Mapping

5.28.6
A81RPFRC*.Mod
Information
81R Frequency Rocof Enabled (Function Config)
Element Disabled
Element Inhibited
A81RPFRC*.Mod.stVal
Device Annunciation ON/TRUE: 1
IEC 61850 Value
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
Range
Enabled
Disabled
Range
Enabled
Disabled
0.05 to 10 Hz/s, Δ 0.05 Hz
Both
Positive
Negative
0 to 20 s Δ 0.01 s
20 to 100 s Δ 0.1 s
100 to 1000 s Δ 1 s
OFF/FALSE: 0
Irrelevant: x
ON: 1
BLOCKED: 2
TEST: 3
TEST/BLOCKED: 4
OFF: 5
Protection and Automation Functions
5.28 81R Frequency Protection – "df/dt"
Settings
Default Gn1 Gn2
Disabled
Settings
Default Gn1 Gn2
Disabled
0.1 Hz/s
Both
0 s
x 0
1 x
x x
5 5
Gn3 Gn4
Gn3 Gn4
1 1
0 0
1 0
2 1
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