Hitachi Relion 670 Series Applications Manual page 94

Section 6
Wide area measurement system
IEC140000131 V1 EN-US
Figure 44:
Figure 45
where SMAI3 is configured as the reference block for DFT reference external out (DFTRefExtOut) and
3PHSUM uses external DFT reference (from SMAI3).
IEC140000132 V2 EN-US
Figure 45:
If settings for PMUREPORT instances (PHASORREPORT1 instances 1 and 2 above) differ for SvcClass
or ReportRate, then the synchrophasor reported by PHASOR2 connection from PHASORREPORT1
instance 2 will not be compliant with IEEE C37.118 standard. The reason is as in the rule 2, 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. On the other hand, when 3PHSUM uses
external DFT reference, it also adapts its filtering according to the SMAI reference block. Therefore, in
order to avoid two different filtering applied to the 3PHSUM block, both SMAI reference block and
3PHSUM shall be connected to the same PHASORREPORT instance. In this example (Figure 45),
SMAI3 adapts its filtering according to PHASORREPORT1 instance 2 (due to connection) and 3PHSUM
is adapting its filtering according to PHASORREPORT1 instance 1. On the other hand, since 3PHSUM is
set to receive external DFT reference from SMAI3, therefore If settings for PHASORREPORT1 instances
1 and 2 above differ for SvcClass or ReportRate, then 3PHSUM block will be affected by two different
88
3PHSUM setting parameters example-showing that 3PHSUM is using the External
DFT reference coming indirectly from SMAI3
shows an example of wrong connection of 3PHSUM and PHASORREPORT blocks in ACT
An example of wrong connection of 3PHSUM and PHASORREPORT blocks in ACT
© 2017 - 2023 Hitachi Energy. All rights reserved
1MRK511407-UUS Rev. N
IEC140000131-1-en
IEC140000132-2-en.vsd
Phasor measurement unit RES670
Application manual