Analog Channel Configuration - ABB RELION REX640 Technical Manual

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1MRS759142 C

Technical Manual

If some functions in the relay application are sensitive to start

frequently, it might be advisable to set the setting parameter Trig mode

to "From operate". Then only faults that cause an operate event trigger

a new fault recording.

The fault-related current, voltage, frequency, angle values, shot pointer and the active

setting group number are taken from the moment of the operate event, or from the

beginning of the fault if only a start event occurs during the fault. The maximum

current value collects the maximum fault currents during the fault. If frequency cannot

be measured, nominal frequency is used for frequency and zero for frequency gradient

and validity is set accordingly.

The measuring mode for phase current and residual current values can be selected with

the A measurement mode setting parameter.

Analog channel configuration

FLTFRC has twelve analog group inputs which must be properly configured.

Analog inputs

1) Can be connected to GRPOFF

See the preprocessing function blocks in this document for the

possible signal sources. The GRPOFF signal is available in the

function block called Protection.

There are a few special conditions which must be noted with the configuration.

Basic functions

Three-phase currents

Residual current (measured or calculated)

Three-phase voltages

Residual voltage (measured or calculated)

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