ABB REB670 Applications Manual page 478

Busbar protection 2.1 ansi, relion 670 series

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Basic IED functions

Examples of adaptive frequency tracking

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 involved

1MRK 505 337-UUS -

Application manual