METHOD, SAFETY DEVICE AND SAFETY SYSTEM FOR DETECTING A FAULT ON A LINE OF AN ELECTRICAL ENERGY SUPPLY NETWORK

摘要

The invention relates to a method for detecting a fault on a line (11) of an electrical energy supply network in which current values are measured at the line ends (11a, 11b) of the line (11) and checked using the current values, whether on the line ( 11) there is an error. In order to carry out a monitoring of the line in such a way that errors can be detected comparatively quickly and sensitively, it is proposed that voltage values are also measured at the line ends, and the respective measured current and voltage values are used to determine respective comparison current values corresponding to the comparison Location (18) indicate current flowing on the line (11) and, using the respective comparison current values, the presence of an error on the line (11) is checked and an error signal is generated when the line (11) is checked. present error has been detected. The invention also relates to a protective device (15a) for carrying out the method and to a protective system having at least two protective devices.