Abstract:
A power line protection system and method are described with a current meter for monitoring the current (i) in the protected power line (10) and a circuit breaker (13-1,13-2,13-3), with the current meter including a sensor (15), particularly a fiber optic current sensor (FOCS), for monitoring a direct current component (i(tr)) in the current (i) transmitted and an analyser (141,16) for testing the direct current component (i(tr)) and for generating a fault signal for the circuit breaker (13-, 13-2,13-3).