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set system frequency.
DFTReference
set to
DFTRefGrpX
uses DFT reference from the
selected group block, when own group selected adaptive DFT 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
VBase
(of the
selected GBASVAL group). This means that the minimum level for the
current amplitude is based on
VBase
. For example, if
VBase
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 502 048-UUS A
Section 17
Basic IED functions
693
Technical manual
Summary of Contents for 650 series
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