ABB REC670 Applications Manual page 416

Relion 670 series, bay control

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analog quantities are fed to the IED via the transformer input module, the Analog to

Digital Converter and thereafter a Pre-Processing Block. In the Pre-Processing Block, a

great number of quantities for example, phase-to-phase analog values, sequence values,

max value in a three phase group etc., are derived. The different function blocks in the

IED are then "subscribing" on selected quantities from the pre-processing blocks. In

case of TR1ATCC (90) or TR8ATCC (90), there are the following possibilities:

I3P1 represents a three-phase group of phase current with the highest current in

any of the three phases considered. As only the highest of the phase current is

considered, it is also possible to use one single-phase current as well as two-phase

currents. In these cases, the currents that are not used will be zero.

For I3P2 and V3P2 the setting alternatives are: any individual phase current/

voltage, as well as any combination of phase-phase current/voltage or the positive

sequence current/voltage. Thus, single-phase as well as, phase-phase or three-

phase feeding on the LV-side is possible but it is commonly selected for current

and voltage.

1MRK 511 401-UUS A

SEMOD159053-65 v6

Bay control REC670 2.2 ANSI

Application manual

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