ABB Relion 670 Series Applications Manual page 99

1MRK 511 407-UUS Rev. J
Figure 38
where the SMAI block is working on 3 ms while PHASORREPORT block is working on 0.9 ms cycle
time.
IEC140000125 V2 EN-US
Figure 38: An example of wrong connection of SMAI and PHASORREPORT blocks in ACT
Violation of rule 1 results in PMU applications not running at all. The reason is the inconsistent
cycle time. For example, in Figure 38, the SMAI block is updating its output every 3 ms while the
PHASORREPORT block is expecting input every 0.9 ms. The PHASORREPORT filtering window is
designed to receive updated input every 0.9 ms and therefore the application will fail.
Rule 2:
The same SMAI or 3PHSUM block can be connected to more than one PHASORREPORT block only if
all the connected PHASORREPORT blocks have similar instance number or only if all the connected
PHASORREPORT blocks have similar settings for SvcClass and ReportRate. Figure
settings for PMUREPORT function block demonstrated by PCM600 Parameter Setting Tool (PST).
IEC140000126 V2 EN-US
Figure 39: PMUREPORT settings in PCM600 PST
Figure 40
where two different SMAI blocks are connected to different PHASORREPORT blocks with different
instance numbers. In this example, as the PHASORREPORT blocks have different instance numbers
and different settings for SvcClass and ReportRate, a separate SMAI block is used for each
PHASORREPORT block.
Phasor measurement unit RES670
Application manual
shows an example of wrong connection of SMAI and PHASORREPORT blocks in ACT
shows an example of correct connection of SMAI and PHASORREPORT blocks in ACT
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Section 6
Wide area measurement system
IEC140000125-2-en.vsd
39 shows the
IEC140000126-2-en.vsd
93