ABB Relion 670 Series Applications Manual page 472

Section 20
Basic IED functions
20.5.2 Application
The rated system frequency and phase rotation direction are set under Main menu /Configuration /
Power system / Primary Values in the local HMI and PCM600 parameter setting tree.
20.5.3 Setting guidelines
Set the system rated frequency. Refer to section
frequency tracking.
20.6 Summation block 3 phase 3PHSUM
20.6.1 Application
The analog summation block 3PHSUM function block is used in order to get the sum of two sets of 3
phase analog signals (of the same type) for those IED functions that might need it.
20.6.2 Setting guidelines
The summation block receives the three-phase signals from SMAI blocks. The summation block has
several settings.
SummationType: Summation type (Group 1 + Group 2, Group 1 - Group 2, Group 2 - Group 1 or –(Group
1 + Group 2)).
DFTReference: The reference DFT block (InternalDFT Ref,DFTRefGrp1 or External DFT ref) .
DFTRefGrp1: This setting means use own internal adaptive DFT reference ( this setting makes the
SUM3PH self DFT adaptive, that is, it will use the measured frequency for the summation signal to adapt
DFT).
InternalDFTRef: Gives fixed window DFT (to nominal system frequency).
ExternalDFTRef: This setting means that the DFT samples-per-cycle (adaptive DFT) will be controlled by
SMAI1 SPFCOUT.
FreqMeasMinVal: The minimum value of the voltage for which the frequency is calculated, expressed as
percent of VBasebase voltage setting (for each instance x).
GlobalBaseSel: Selects the global base value group used by the function to define (IBase), (VBase) and
(SBase).
20.7 Global base values GBASVAL
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