METHOD AND CIRCUIT ARRANGEMENT FOR THE DETECTION OF AN ARC ARC AND PHOTOVOLTAIC (PV) INVERTER WITH A CORRESPONDING CIRCUIT ARRANGEMENT

摘要

The application describes a method for detecting an arc (9) in a direct current circuit (6) with a DC load (3), a DC source (2) supplying the DC load (3) and one between the DC source ( 2) and the DC load (3) arranged circuit arrangement (1). A power flow between the DC source (2) and an output (8) of the circuit arrangement (1) is suppressed by means of the switching unit (10) by cyclical interruption, so that the power flow in an active time window (31) with the first time duration Δt1 is enabled and is suppressed in a deactivated time window (32) with the second duration Δt2. By detecting a current I characterizing the power flow P and / or a voltage U characterizing the power flow P in two successive active time windows (31) and comparing the detected values of current I and / or voltage U of the active time window (31) with the corresponding detected values Values from the previous active time window (31), an arc (9) can be signaled if these values of the active time window (31) differ from the corresponding values of the previous active time window (31) by more than a threshold value a circuit arrangement (1) for the detection of an electric arc (9) and a photovoltaic (PV) inverter (40) with such a circuit arrangement (1).