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ABB AI830A-EA new with one year warranty AI830A

By calculating the reactive current component (sin φ adjustment) and then comparing the phase angle in relation to the residual voltage UE, the ER/XR-relay type determines whether the line to be protected is earth-faulted. On non-earth-faulted lines, the capacitive component Ic(a) of the total current precedes the residual voltage by an angle of 90°. In case of a faulty line the capacity current IC(b) lags behind the residual voltage at 90°. 

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