ABB Relion 670 Series RES670, Technical Manual

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voltage is connected to all three SMAI inputs, the positive sequence
voltage will be zero and the frequency functions will not work properly.
The outputs from the above configured SMAI block shall only be used for
Overfrequency protection (SAPTOF, 81), Underfrequency protection
(SAPTUF, 81) and Rate-of-change frequency protection (SAPFRC, 81)
due to that all other information except frequency and positive sequence
voltage might be wrongly calculated.
20.16 Summation block 3 phase 3PHSUM
20.16.1 Functionality
Summation block 3 phase function 3PHSUM is used to get the sum of two sets of three-
phase analog signals (of the same type) for those IED functions that might need it.
20.16.2 Function block
3PHSUM
BLOCK
REVROT
^G1AI3P*
^G2AI3P* AI3P
AI1
AI2
AI3
AI4
IEC05000441-3-en.vsdx
IEC05000441 V3 EN
Figure 284: 3PHSUM function block
20.16.3 Signals
Table 621: 3PHSUM Input signals
Name Type Default Description
BLOCK BOOLEAN 0 Block
BLKGR1 BOOLEAN 0 Block input for group 1
BLKGR2 BOOLEAN 0 Block input for group 2
Table continues on next page
1MRK 511 365-UUS A
Section 20
Basic IED functions
Phasor measurement unit RES670 2.1 ANSI 743
Technical manual