ABB REC670 Applications Manual page 120

Section 6
Wide area measurement system
114
IEC140000127 V2 EN-US
Figure 41: An example of correct connection of SMAI and PHASORREPORT
blocks in ACT
Figure 42 shows an example of wrong connection of SMAI and PHASORREPORT
blocks in ACT 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.
1MRK 511 401-UEN A
IEC140000127-2-en.vsd
Bay control REC670 2.2 IEC
Application manual