METHOD FOR LOCATING A FAULT IN A POWER GRID ON THE BASIS OF DISTRIBUTED VOLTAGE MEASUREMENTS

摘要

A fault locating method on an electrical grid powered by a source uses a form of triangulation of voltage measurements at at least three different locations on the network, with at least one of the locations upstream of the defect in relation to the network. source. Current phasors corresponding to the voltages measured during the fault are temporally synchronized. Network conductors involved in the fault are determined according to the characteristics of the voltage phasors and a fault current causing a voltage drop at one of the measurement locations with respect to an initial voltage value is evaluated. A fault position is evaluated at a point in the network or a ratio between a difference in voltages measured at two of the measurement locations and an impedance between one of the two measurement locations and the point considered, depending on the implied conductors, is equal to the fault current.