These DFT reference block settings decide DFT reference for DFT calculations
(
InternalDFTRef
will use fixed DFT reference based on set system frequency.
DFTRefGrpn
will use DFT reference from the selected group block, when own group
selected adaptive DFT reference will be used based on calculated signal frequency
from own group.
ExternalDFTRef
will use reference based on input DFTSPFC.
MinValFreqMeas
: The minimum value of the voltage for which the frequency is
calculated, expressed as percent of "Voltage base Val PP" (of the selected BASEPH
group).
Settings
DFTRefExtOut
and
DFTReference
shall be set to default
value "InternalDFTRef" if no VT inputs are available. If, however, it
is necessary to use frequency adaptive DFT (
DFTReference
set to
other than default, refering current measuring SMAI) when no
voltages are available, one must note that the MinValFreqMeas
setting is still set in reference to "Voltage base Val PP" (of the selected
BASEPH group). This means that the minimum level for current
amplitude is based on Voltage base Val PP. For example, if Voltage
base Val PP is 20000, the resulting minimum amplitude for current is
20000 * 10% = 2000.
1MRS757256 F
Section 3
Basic functions
PML630/Compact Load-Shedding Solution
63
Technical Manual
Summary of Contents for Relion 630 Series
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