Method for detecting resistive faults in the output line of a power distribution network operating in compensated neutral mode uses a complex phase diagram for plotting an operating point and fault operating zones

摘要

Power network has a balancing coil and the method is based on measuring the residual current in the line. Method has the following steps: the homopolar voltage phase of a set of bars (14) powering the output line is measured, from the voltage phase a complex vector diagram is determined, within the diagram operating zones corresponding to a resistive fault or absence of a fault are determined and an operating point of the output line is positioned in the diagram on the basis of the measured residual current. The complex diagram is used to determine whether the coincidence between the operating point and the detection zone corresponds to a fault detection.