ABB Relion 670 Series Applications Manual page 110

Section 6
Wide area measurement system
Only SMAI or 3PHSUM blocks shall be connected to PMU PHASORREPORT blocks and they shall
have the same cycle time, 0.9 ms.
Figure 39
where both function blocks are working on 0.9 ms cycle time.
IEC140000124 V2 EN-US
Figure 39: An example of correct connection of SMAI and PHASORREPORT blocks in ACT
Figure 40
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 40: 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 40, 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
41 shows the settings for PMUREPORT function block demonstrated by PCM600 Parameter
Setting Tool (PST).
104
shows an example of correct connection of SMAI and PHASORREPORT blocks in ACT
shows an example of wrong connection of SMAI and PHASORREPORT blocks in ACT
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IEC140000125-2-en.vsd
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