ABB Relion 670 Series Applications Manual page 573

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1MRK 511 401-UUS F

Bay control REC670

Application manual

Preprocessing block shall only be used to feed functions within the same execution

cycles (e.g. use preprocessing block with cycle 1 to feed transformer differential

protection). The only exceptions are measurement functions (CVMMXN,

CMMXU,VMMXU, etc.) which shall be fed by preprocessing blocks with cycle 8.

When two or more preprocessing blocks are used to feed one protection function

(e.g. over-power function GOPPDOP), it is of outmost importance that parameter

setting DFTReference has the same set value for all of the preprocessing blocks

Basic IED functions