ABB RES670 Applications Manual page 102

Section 6
Wide area measurement system
96
Figure 36 shows an example of correct connection of SMAI and
PHASORREPORT blocks in ACT where both function blocks are working on 0.9
ms cycle time.
IEC140000124 V2 EN-US
Figure 36: An example of correct connection of SMAI and PHASORREPORT
blocks in ACT
Figure 37 shows an example of wrong connection of SMAI and PHASORREPORT
blocks in ACT 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 37: 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 37, 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
PMUREPORT function block demonstrated by PCM600 Parameter Setting Tool
(PST).
1MRK 511 407-UEN C
IEC140000124-2-en.vsd
IEC140000125-2-en.vsd
38 shows the settings for
Phasor measurement unit RES670 2.2 IEC
Application manual