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ABB PU515A 3BSE032401R1 with factory sealed box PU515
In compensated mains the earth fault direction cannot be determined from the reactive current
components because the reactive part of the earth current depends upon the compensation level of
the mains. The ohmic component of the total current (calculated by cos φ adjustment) is used in
order to determine the direction. The resistive component in the non-faulted line is in phase with
the residual voltage, while the resistive component in the faulted line is opposite in phase with the
residual voltage.
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