Operation Principle - ABB Relion 650 Series REB650 Technical Manual

Section 15
Basic IED functions
Table 402: SMAI_20_12 Non group settings (basic)
Name
GlobalBaseSel
DFTReference
ConnectionType
AnalogInputType
Table 403: SMAI_20_12 Non group settings (advanced)
Name
Negation
MinValFreqMeas
15.9.6
482
measuring SMAI is used as a frequency reference for the adaptive
DFT. This is not recommended, see the Setting guidelines.
Values (Range) Unit
1 - 6 -
InternalDFTRef -
DFTRefGrp1
DFTRefGrp2
DFTRefGrp3
DFTRefGrp4
DFTRefGrp5
DFTRefGrp6
DFTRefGrp7
DFTRefGrp8
DFTRefGrp9
DFTRefGrp10
DFTRefGrp11
DFTRefGrp12
External DFT ref
Ph-N -
Ph-Ph
Voltage -
Current
Values (Range) Unit
Off -
NegateN
Negate3Ph
Negate3Ph+N
5 - 200 %
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.

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
Step Default
1 1
- InternalDFTRef
- Ph-N
- Voltage
Step Default
- Off
1 10
1MRK 505 288-UEN A
Description
Selection of one of the Global Base Value
groups
DFT reference
Input connection type
Analog input signal type
Description
Negation
Limit for frequency calculation in % of
UBase
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