ABB REG670 - Page 124

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.
IEC140000128-2-en.vsd
IEC140000128 V2 EN
Figure 48: An example of wrong connection of SMAI and PHASORREPORT
blocks in ACT
Rule 3:
This rule is only related to the connection of 3PHSUM block to the
PHASORREPORT block. If 3PHSUM block is configured to use external DFT
reference (from SMAI reference block), it shall only be connected to the same
PHASORREPORT block instance as the one the SMAI reference block is connected
to. In other words, both the SMAI reference block and 3PHSUM block (3PHSUM
block with external DFT reference) shall be connected to the same instance of
PHASORREPORT block (PHASOR1-32 of Instance number 1 or 2).
Figure
49 shows an example of correct connection of 3PHSUM and
PHASORREPORT blocks in ACT where SMAI3 is configured as the reference block
for DFT reference external out (DFTRefExtOut) and 3PHSUM uses external DFT
reference (from SMAI3). Figures 50 and 51 show the corresponding setting
parameters.
Section 6 1MRK 502 071-UEN -
Wide area measurement system
118 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual