measuring SMAI is used as a frequency reference for the adaptive
DFT. This is not recommended, see the Setting guidelines.
Table 515:
SMAI_20_12 Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSel
1 - 6
-
1
1
Selection of one of the Global Base Value
groups
DFTReference
InternalDFTRef
DFTRefGrp1
DFTRefGrp2
DFTRefGrp3
DFTRefGrp4
DFTRefGrp5
DFTRefGrp6
DFTRefGrp7
DFTRefGrp8
DFTRefGrp9
DFTRefGrp10
DFTRefGrp11
DFTRefGrp12
External DFT ref
-
-
InternalDFTRef
DFT reference
ConnectionType
Ph-N
Ph-Ph
-
-
Ph-N
Input connection type
AnalogInputType
Voltage
Current
-
-
Voltage
Analog input signal type
Table 516:
SMAI_20_12 Non group settings (advanced)
Name
Values (Range)
Unit
Step
Default
Description
Negation
Off
NegateN
Negate3Ph
NeN
-
-
Off
Negation
MinValFreqMeas
5 - 200
%
1
10
Limit for frequency calculation in % of
UBase
Even if the
AnalogInputType
setting of a SMAI block is set to
Current
, the
MinValFreqMeas
setting is still visible. This means that
the minimum level for current amplitude is based on
UBase
. For
example, if
UBase
is 20000, the minimum amplitude for current is
20000 * 10% = 2000. This has practical affect only if the current
measuring SMAI is used as a frequency reference for the adaptive
DFT. This is not recommended, see the Setting guidelines.
17.9.6
Operation principle
Every SMAI can receive four analog signals (three phases and one neutral value),
either voltage or current. The
AnalogInputType
setting should be set according to the
Section 17
1MRK 502 048-UEN A
Basic IED functions
642
Technical manual
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