11.4 Frequency time accumulation protection function
FTAQFVR (81A)
GUID-124A1F91-44C0-4DB6-8603-CC8CA19AE2A6 v3
11.4.1 Identification
GUID-87605DA0-EAA6-4A6C-BF03-7FDB187E1B29 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/
IEEEidentification
Frequency time accumulation
protection
FTAQFVR f<> 81A
11.4.2 Application
GUID-82CA8336-82BE-42AB-968A-D4F08941C9D0 v3
Generator prime movers are affected by abnormal frequency disturbances. Significant
frequency deviations from rated frequency occur in case of major disturbances in the
system. A rise of frequency occurs in case of generation surplus, while a lack of
generation results in a drop of frequency
.
The turbine blade is designed with its natural frequency adequately far from the rated
speed or multiples of the rated speed of the turbine. This design avoids the mechanical
resonant condition, which can lead to an increased mechanical stress on turbine blade.
If the ratio between the turbine resonant frequencies to the system operating frequency
is nearly equal to 1, mechanical stress on the blades is approximately 300 times the
nonresonant operating condition stress values. The stress magnification factor is shown
in the typical resonance curve in Figure
217.
Section 11 1MRK 502 071-UUS A
Frequency protection
476 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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