Apparatus for localization of a line fault through the use of predeterminably shiftable reference location

An apparatus for fault localization on a line wherein an evaluation signal is formed from at least one measurement voltage signal derived from the line voltage and at least one measurement current signal derived from the line current, the evaluation signal characterizing the direction and/or the distance of a fault location with respect to a reference location on the line which can be controlled by at least one adjustment magnitude, a voltage- and current-measurement device provided at the measurement location, a signal processing- and evaluation circuit having an input side operatively connected in circuit with said voltage- and current-measurement device, said signal processing - and evaluation circuit having an output side delivering said evaluation signal, the signal processing- and evaluation circuit possessing at least one reference location-adjustment input for the infeed of said adjustment magnitude, and means providing an operative connection between an output of the evaluation circuit and the reference location-adjustment input, said means providing said operative connection changing the momentarily effective reference location adjustment as a function of said evaluation signal.