Dielectric strength measurements in photovoltaic modules

The purpose of this study is to determine the dielectric strength of a photovoltaic module through laboratory measurements. The measurements were taken using the standard impulse voltage, according to IEC 61730-2. Measurements were taken before and after the voltage stress in order to investigate in which way the module is affected. These results appear in the IV and PI characteristic curves. Subsequently, after a period of six months, the stressed module was compared to a similar non-stressed to find out whether the first regains some of its properties. In the same way the IV and PI curves are quoted. In conclusion the results obtained are evaluated and confirmed by the standards with a view to approach an optimal design of lightning and surge protection systems for photovoltaic installations (PVIs).