Diagnostic device for photovoltaic module, has measuring unit measuring leakage current of modules at grounded terminal, where leakage current is caused by signal due to capacitance increase as sequence of damage of modules

摘要

The device has an inverter (5), a transmitter (6) and a pulse generator (8) for generating a high frequency signal that is supplied to photovoltaic modules. A measuring unit (7) measures leakage current (If) of the photovoltaic modules at a grounded terminal. The leakage current is caused by the high frequency signal due to capacitance increase as a sequence of damage of the photovoltaic modules. The measuring unit is arranged in a connection line (3) of a module frame (2) to the grounded terminal, where the transmitter is installed in a direct current cable (4) of the photovoltaic modules. An independent claim is also included for a method for diagnosis of a photovoltaic module.