The outputs from the above configured SMAI block shall only be
used for Overfrequency protection (SAPTOF), Underfrequency
protection (SAPTUF) and Rate-of-change frequency protection
(SAPFRC) due to that all other information except frequency and
positive sequence voltage might be wrongly calculated.
16.9 Summation block 3 phase 3PHSUM
SEMOD55968-1 v2
16.9.1 Functionality
SEMOD55976-4 v4
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.
16.9.2 Function block
SEMOD54885-4 v3
3PHSUM
BLOCK
REVROT
^G1AI3P*
^G2AI3P*
AI3P
AI1
AI2
AI3
AI4
IEC05000441-3-en.vsdx
IEC05000441 V3 EN-US
Figure 303: 3PHSUM function block
16.9.3 Signals
SEMOD55989-1 v2
PID-6428-INPUTSIGNALS v3
Table 532: 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
REVROT BOOLEAN 0 Reverse rotation
G1AI3P GROUP
SIGNAL
- Group 1 three phase analog input from first SMAI
G2AI3P GROUP
SIGNAL
- Group 2 three phase analog input from second
SMAI
1MRK 505 384-UEN A Section 16
Basic IED functions
Breaker protection REQ650 2.2 IEC 673
Technical manual
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