Figure. 5.4.8. - 40. Simpli ed function block diagram of the REF function.
Measured input values
Function block uses analog current measurement values. Function uses the fundamental frequency
magnitude of the current measurement inputs and calculated residual current with residual current
measurement. For residual current measurement I01 or I02 can be selected.
Please note that in cable end differential mode the difference is calculated only when measured I0
current is available.
Table. 5.4.8. - 93. Analogic magnitudes used by the REF function.
Signal
Description
Time base
IL1RMS
Fundamental RMS measurement of phase L1/A current
5 ms
IL2RMS
Fundamental RMS measurement of phase L2/B current
5 ms
IL3RMS
Fundamental RMS measurement of phase L3/C current
5 ms
I01RMS
Fundamental RMS measurement of residual input I01
5 ms
I02RMS
Fundamental RMS measurement of residual input I02
5 ms
IL1Ang
Fundamental angle of phase L1/A current
5 ms
IL2 Ang
Fundamental angle of phase L2/B current
5 ms
IL3 Ang
Fundamental angle of phase L3/C current
5 ms
I01 Ang
Fundamental angle of residual input I01
5 ms
I02 Ang
Fundamental angle of residual input I02
5 ms
Selection of the used residual current input AI channel is made with a setting parameter.
General settings
The following general settings de ne the general behavior of the function. These settings are static i.e.
it is not possible change them with setting group switching.
Table. 5.4.8. - 94. General settings of the REF stage (not SG selectable)
Name Range Step Default
Description
AQ-T257
Instruction manual
Version: 2.00
© Arcteq Relays Ltd
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