ABB Relion 670 Series Applications Manual page 114

Section 6
Wide area measurement system
IEC140000131 V1 EN-US
Figure 46: 3PHSUM setting parameters example-showing that 3PHSUM is using the External
Figure 47
where SMAI3 is configured as the reference block for DFT reference external out (DFTRefExtOut)
and 3PHSUM uses external DFT reference (from SMAI3).
IEC140000132 V2 EN-US
Figure 47: An example of wrong connection of 3PHSUM and PHASORREPORT blocks in ACT
If settings for PMUREPORT instances (PHASORREPORT1 instances 1 and 2 above) differ for
SvcClass or ReportRate, then the synchrophasor reported by PHASOR2 connection from
PHASORREPORT1 instance 2 will not be compliant with IEEE C37.118 standard. The reason is as in
the rule 2, the filtering in SMAI/3PHSUM block is adapted according to the performance class
(SvcClass) and reporting rate of the connected instance of PHASORREPORT function block. On the
other hand, when 3PHSUM uses external DFT reference, it also adapts its filtering according to the
SMAI reference block. Therefore, in order to avoid two different filtering applied to the 3PHSUM
block, both SMAI reference block and 3PHSUM shall be connected to the same PHASORREPORT
instance. In this example (Figure 47), SMAI3 adapts its filtering according to PHASORREPORT1
instance 2 (due to connection) and 3PHSUM is adapting its filtering according to PHASORREPORT1
instance 1. On the other hand, since 3PHSUM is set to receive external DFT reference from SMAI3,
therefore If settings for PHASORREPORT1 instances 1 and 2 above differ for SvcClass or
108
DFT reference coming indirectly from SMAI3
shows an example of wrong connection of 3PHSUM and PHASORREPORT blocks in ACT
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