reference will be used based on the calculated signal frequency from own group.
DFTReference
set to
External DFT Ref
will use reference based on input signal
DFTSPFC
.
Settings
DFTRefExtOut
and
DFTReference
shall be set to default
value
InternalDFTRef
if no VT inputs are available. However, if it is
necessary to use frequency adaptive DFT (
DFTReference
set to other
than default, referring current measuring SMAI) when no voltages are
available, note that the
MinValFreqMeas
setting is still set in
reference to
UBase
(of the selected GBASVAL group). This means
that the minimum level for the current amplitude is based on
UBase
.
For example, if
UBase
is 20000, the resulting minimum amplitude for
current is 20000 * 10% = 2000.
MinValFreqMeas
: The minimum value of the voltage for which the frequency is
calculated, expressed as percent of the voltage in the selected Global Base voltage
group (GBASVAL:n, where 1<n<6).
Below example shows a situation with adaptive frequency tracking with one reference
selected for all instances. In practice each instance can be adapted to the needs of the
actual application.
1MRK 504 135-UEN A
Section 17
Basic IED functions
587
Technical manual
Summary of Contents for ret650
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