Identification and directional detection of a defect in a three-phase network

摘要

The device (15) has a current representative parameter processing unit (30) with a computing unit (44) to compute current resulting from sum of parameter and resultant frequency analysis units (46, 48) with comparison of zero harmonic components (I0pDC) and two harmonic components (I0p 2F) with respect to proper frequency of a three-phase network. Activation units (32) activate the processing units based on a defect occurrence detection signal (D) in the network, and interpretation units (40) interpret processing results with the processing unit to determine if defect is biphasic. Independent claims are also included for the following: (1) a short circuit default indicator comprising current sensors arranged on each phase conductor (2) a method for identifying defect in a three-phase network (3) a method for identifying and relative localization of defect in a three-phase network (4) a method for protecting a current line.