ABB Relion REC670, Applications Manual

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IEC140000127-2-en.vsd
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-UUS A
Section 6
Wide area measurement system
Bay control REC670 2.2 ANSI 117
Application manual