ABB RELION 670 Series Technical Manual page 1275

1MRK 502 066-UUS B
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
21.10.1 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.
21.10.2 Function block
BLOCK
BLKGR1
BLKGR2
REVROT
^G1AI3P*
^G2AI3P*
IEC05000441 V4 EN-US
Figure 641: 3PHSUM function block
21.10.3 Signals
Table 989: 3PHSUM Input signals
Name
BLOCK
BLKGR1
BLKGR2
REVROT
G1AI3P
G2AI3P
Table 990: 3PHSUM Output signals
Name
SPFCOUT
AI3P
AI1
Table continues on next page
Technical manual
3PHSUM
SPFCOUT
AI3P
AI1
AI2
AI3
AI4
IEC05000441-4-en.vsdx
Type Default
BOOLEAN 0
BOOLEAN 0
BOOLEAN 0
BOOLEAN 0
GROUP -
SIGNAL
GROUP -
SIGNAL
Type
REAL
GROUP SIGNAL
GROUP SIGNAL
Description
Block
Block input for group 1
Block input for group 2
Reverse rotation
Group 1 three phase analog input from first SMAI
Group 2 three phase analog input from second SMAI
Description
Number of samples per fundamental cycle from internal DFT
reference function
Linear combination of two connected three phase inputs
Linear combination of input 1 signals from both SMAI blocks
Section 21
Basic IED functions
SEMOD55968-1 v2
SEMOD55976-4 v4
SEMOD54885-4 v3
SEMOD55989-1 v2
PID-6428-INPUTSIGNALS v3
PID-6428-OUTPUTSIGNALS v4
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