DETERMINING THE DIRECTION OF INTERMITTENT EARTH FAULTS IN ENERGY SUPPLY NETWORKS

摘要

The invention relates to a method for generating a direction signal that indicates a direction in which an intermittent earth fault (17) in an electrical energy supply network is located. Zero current measurement values indicating a zero current and zero voltage measurement values indicating a zero voltage are detected and are used by a protection device (15) to form the direction signal. In order to be able to determine a direction as simply and as quickly as possible, according to the invention the zero current measurement values and the zero voltage measurement values are detected at the same measuring point (12) of the energy supply network, current peak values are determined as that component from the course of the zero current measurement values that comprises at least one current peak indicating an intermittent earth fault (17), the phasing of the course of the current peak values is compared with the phasing of the course of the zero voltage measurement values, and a direction signal that indicates an intermittent earth fault (17) lying in the forward direction with respect to the measuring point (12) is generated when the phasing of the current peak values coincides with the phasing of the zero voltage values.