DEVICE FOR PROTECTING A DIRECT CURRENT PHOTOVOLTAIC PLANT

摘要

Described is a device (9) for protecting from electric arcs a direct current photovoltaic plant (1), having one or more photovoltaic modules (2) connected to an inverter (3), comprising: a sensor (10) for generating a signal representing a current passing through a cable of the plant (1); a conditioning stage (12) comprising a band-pass filter, for conditioning the signal detected by the sensor; a threshold comparator (13) having a voltage reference value which is set and adjustable, connected to the conditioning stage (12); a counter (15) and a processor (14) for generating a fault signal as device output; the processor (14) is programmed to activate the counter (15) in response to a situation in which the signal detected exceeds the reference value of the comparator (13), and to generate the fault signal as a function of a situation in which the reference value is further exceeded by the signal detected, after a predetermined time interval from the first situation.