The same phase-phase voltage connection principle shall be used for frequency tracking master
SMAI block in pump-storage power plant applications when swapping of positive and negative
sequence voltages happens during generator/motor mode of operation.
21.10
Summation block 3 phase 3PHSUM
SEMOD55968-1 v2
21.10.1
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.
21.10.2
Function block
SEMOD54885-4 v3
3PHSUM
BLOCK
BLKGR1
BLKGR2
REVROT
^G1AI3P*
^G2AI3P*
SPFCOUT
AI3P
AI1
AI2
AI3
AI4
IEC05000441-4-en.vsdx
IEC05000441 V4 EN-US
Figure 641: 3PHSUM function block
21.10.3
Signals
SEMOD55989-1 v2
PID-6428-INPUTSIGNALS v3
Table 989: 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
PID-6428-OUTPUTSIGNALS v4
Table 990: 3PHSUM Output signals
Name
Type
Description
SPFCOUT
REAL
Number of samples per fundamental cycle from internal DFT
reference function
AI3P
GROUP SIGNAL
Linear combination of two connected three phase inputs
AI1
GROUP SIGNAL
Linear combination of input 1 signals from both SMAI blocks
Table continues on next page
1MRK 502 066-UUS B
Section 21
Basic IED functions
1269
Technical manual
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