ABB REG316 4 Series Operating Instructions Manual page 102

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. F
Operation of the inrush blocking feature (parameter MaxMin
set to 'MAX-Inrush')
The inrush detector picks up and blocks operation of the function
when the amplitude of the fundamental component of the current
exceeds the setting of the current function.
The inrush detector is based on the evaluation of the second
harmonic component of the current I in relation to the funda-
2h
mental frequency component I (evaluation of the amplitudes).
1h
The output of the function is disabled when the ratio I /I ex-
2h 1h
ceeds 10 % and enabled again when it falls below 8 %.
There is no setting for the peak value of I /I .
2h 1h
The function can operate with inrush blocking in both the single
and three-phase mode (parameter 'NrOfPhase').
In the three-phase mode, the phase used for evaluation is the
one with the highest amplitude at rated frequency (pick-up and
inrush detection).
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