METHOD FOR DETERMINING A CAUSE OF A FAULT IN AN ELECTRICAL ENERGY SUPPLY NETWORK AND PROTECTIVE DEVICE FOR PERFORMING SUCH A METHOD

摘要

Method for determining a cause of a fault in an electrical energy supply network and protective device for performing such a method The invention relates to a method for determining a cause of a fault in an electrical energy supply network (11, 21a, 21b), in which electrical measurement variables are detected at at least one measurement point (12) of the energy supply network (11, 21a, 21b), and the electrical measurement variables are fed to at least one protective device (13), which examines the measurement variables with respect to the presence of a fault in the electrical energy supply network (11, 21a, 21b), and generates a fault signal in the event of an identified fault- In addition to identifying a fault in an energy supply network, in order to determine a cause of the fault as well, it is proposed that, after a fault has been identified by the at least one protective device (13), time profiles of the measurement variables with respect to the presence of specific criteria are examined, said time profiles having been detected immediately before and/or during the fault, wherein possible causes of faults are assigned to the individual criteria and/or combinations of criteria, one or more criteria that are entirely or partially fulfilled by the examined profiles of the measurement variables are determined, and a cause of the fault is determined on the basis of the determined criteria and the degree to which they are fulfilled by the profiles. The invention also relates to a protective device (13) for performing such a method. Figure 1