ABB Relion 670 Series Applications Manual page 100

Section 6
Wide area measurement system
IEC140000127 V2 EN-US
Figure 40: An example of correct connection of SMAI and PHASORREPORT blocks in ACT
Figure 41
where the same SMAI block is connected to different PHASORREPORT blocks with different
instance numbers. Such connection will be only correct if both connected PHASORREPORT blocks
have similar settings for SvcClass and ReportRate. If settings for PMUREPORT instances differ for
SvcClass or ReportRate, then PHASOR1 connection in PHASORREPORT1 instance 2 will not be
compliant with IEEE C37.118 standard. The reason is that 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. In this example, SMAI1 will adapt its filtering
according to PHASORREPORT instance 1 (because of higher priority) and therefore
PHASORREPORT instance 2 will receive data which does not match its performance class and
report rate.
IEC140000128 V2 EN-US
Figure 41: An example of wrong connection of SMAI and PHASORREPORT blocks in ACT
94
shows an example of wrong connection of SMAI and PHASORREPORT blocks in ACT
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IEC140000127-2-en.vsd
IEC140000128-2-en.vsd
Phasor measurement unit RES670
Application manual