ABB Relion 670 Series Applications Manual page 477

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1MRK 505 370-UUS Rev. K

Examples of adaptive frequency tracking

Busbar protection REB670

Application manual

Even if the user sets the AnalogInputType of a SMAI block to "Current", the

MinValFreqMeas is still visible. However, using the current channel values as base for

frequency measurement is not recommendable for a number of reasons, not last

among them being the low level of currents that one can have in normal operating

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

Basic IED functions

Relion reb670