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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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ZheXun Electric Automation Company has more than 10 years of experiences in supplying industrial PLC & DCS items.
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