METHOD AND SYSTEM FOR DETECTING RESIDUAL SECONDARY CURRENT IN CURRENT TRANSFORMER IN HIGH TENSION ELECTRICAL NETWORK, AND FOR DETECTING ARC FORMATION IN CIRCUIT BREAKER

摘要

The invention relates to a method and system for detecting a residual secondary current in a current transformer in a high tension electrical network. In this method, a synchronous direction (50, 51) of this current is produced using at least one reference signal, which is a network signal (Us) having the same repetition frequency as the current being detected, producing low-pass filtering. The invention also relates to a method and system for detecting arc formation in a circuit breaker.