Monitoring device for an isolated network of a photovoltaic system

摘要

Monitoring device for an isolated electrical network (2) of a photovoltaic system (4), with a short-circuit measuring circuit comprising a first electrical measuring circuit conductor (12) for connecting a first electrical pole (8) of the photovoltaic system (4) via at least one protective component (13) to a Reference point (20) and a second electrical measuring circuit conductor (14) for connecting a second electrical pole (10) of the photovoltaic system (4) via at least one protective component (13) to the reference point (20), the two measuring circuit conductors (12, 14) together form a short circuit between the two electrical poles (8, 10) of the photovoltaic system, a first component (16) connected between one of the measuring circuit conductors (12, 14) and the reference point (20) and a measuring device (22) for measuring an electrical parameter of the first component (16), in response to an amount of the parameter not equal to zero and / or a change in the amount of the parameter an electrical short-circuit of the photovoltaic system (4) with the reference point (20) can be detected.